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  • 1960-1964  (1.860)
  • 1920-1924  (688)
  • Life and Medical Sciences  (2.325)
  • Biochemistry and Biotechnology  (223)
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  • 101
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 6 (1964), S. 235-240 
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: The operation and construction of a liquid-liquid chromatography apparatus containing differentially permeable partions is described. The method is of value for the separation of heat sensitive and nonvolatile solutes.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 102
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 6 (1964), S. 3-4 
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
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  • 103
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 6 (1964), S. 5-5 
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
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  • 104
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 6 (1964), S. 12-13 
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
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  • 105
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 6 (1964), S. 23-25 
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
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  • 106
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 6 (1964), S. 50-52 
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
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  • 107
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 6 (1964), S. 63-64 
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
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  • 108
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 6 (1964), S. 71-72 
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 109
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 6 (1964) 
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
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  • 110
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A number of histologic and histochemical techniques have been used to study 42 human fetal thyroids from fresh specimens ranging in crown-rump length from 22 to 201 mm. Three periods of differentiation (colloid production) were defined. The first or precolloid stage was found in fetuses of 22 to 65 mm and consisted of strands of compact epithelial cells separated by loose connective tissue which contained only a few vessels. The early colloid production period from 65 to 80 mm was characterized by the appearance of small accumulations of colloid in the center of the follicles. The blood vessels between follicles increased during this period. In the last period during maturation of the colloid cavities, the spaces between the epithelium were more reduced and almost completely filled with blood vessels. No change in the average cell height was found during differentiation.With differentiation, the nuclei of epithelium became less compact and RNAase-removable cytoplasmic material increased. Also of interest was the marked decrease in glycogen at the time of colloid production.The staining characteristics of the early colloid showed little change during the period studied. The colloid was stained by the following reagents: periodic-acid Schiff, mercury organge, toluidine, ninhydrin-Schiff, Millon's and Sakaguchi's. The larger colloid spaces took slightly more toluidine stain than the smaller ones.The enzyme reaction for alkaline phosphatase was found only in the vascular system, and acid phosphatase was found in the cytoplasm of epithelium and, especially in the differentiated specimens, it was concentrated at the apex of the cell. Lactic and succinic dehydrogenase activity did not seem to change with maturation and was located in the cytoplasm around the nucleus and toward the apex of the cell.Thin rays of colloid-like material were observed to radiate out between cells from early colloid cavities. Based on unpublished electron microscopic data, organ cultures of human thyroid and observations from the developing chick, these spaces probably represent intercellular dilatations which have been filled with colloid from the central cavity. These spaces may be a secondary or safety mechanism which allows the circumference of the follicle to increase in size.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 111
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964), S. 411-433 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The distribution and origin of interstitial tissue has been studied in various mammalian ovaries with histochemcal techniques for lipids. The interstitial tissue contains sudanophilic droplets of different sizes consisting of phospholipids, triglycerides and cholesterol and its esters; the lipids are comparatively unsaturated.The granulosa of normal follicles contains heterogeneous lipid bodies of various sizes composed of unsaturated phospholipids. With the start of atresia these lipid bodies also develop neutral fats (triglycerides). Besides the heterogeneous lipid bodies, another type of sudanophilic lipid droplets of atresia, consisting of triglycerides, cholesterol and its ester and little phospholopids, are formed in the granulosa cells. When the number of these lipid droplets is sufficiently increased, the heterogeneous lipid bodies disappear from the atretic follicles. The theca of such atretic follicles hypertrophies and persists to form the interstitial tissue whereas the granulosa cells, along with the lipid droplets, regress and disappear.In the rat ovary, the interstitial tissue occurs as scattered patches of various sizes that are derived from the theca of atretic preantral and antral follicles. Most of the lipid droplets of the interstitial tissue are mobilized from the preovulatory rat ovary. All of the bat ovary is occupied by interstitial tissue except for the cortex; the tissue is formed in the same way as in the rat. In the cat ovary, the interstitial tissue is sparsely scattered between the follicles and originates from the theca and adjacent stromal cells of normal and atretic follicles. In the dog ovary the interstitial tissue has a similar origin and also arises from invaginations of germinal epithelium. In the opossum ovary the interstitial tissue is present in the form of sparsely scattered patches of cells which arise from the theca of large preantral follicles. A few lipid bodies, consisting of unsaturated phospholipids, appear in the interstitial tissue.
    Materialart: Digitale Medien
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  • 112
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: An electron microscopic study has been made of the constituents of the lamina propria of the stomach, small intestine and large intestine of the mouse. This layer is highly cellular in the intestines, less so in the stomach. The connective tissue cells are often crowded together without detectable fibers or ground substance between.Below the basement (boundary) membrane of the epithelium attenuated fibrocytes form an almost continuous layer. The appearance of a fibroblast in mitotic division is described.In the connective tissue spaces are abundant plasma cells, macrophages, undifferentiated cells and eosinophils. The fine structure of each is described and illustrated.Particularly evident is the frequency with which plasma cells lie in direct contact with macrophages and with eosinophils. In some instances, vesicles of similar appearance occur in apposed plasma cell and macrophage, suggestive of exchange of material.These close relations of macrophages, plasma cells, and eosinophils are discussed in terms of the role each plays in the defense of the organism against foreign antigens.
    Materialart: Digitale Medien
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  • 113
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964) 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Materialart: Digitale Medien
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  • 114
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: With the aid of a Zeiss operation microscope, a dissection was made of the nerves to the blood vessels of the dorsum and sides in the two feet of the cadaver of an adult man. No obvious vascular nerve issued from the saphenous nerve. The terminations of the dorsal metatarsal and interdigital arteries and veins over the two medial thirds of the dorsum of the foot were supplied by extremely thin nervelets which originated chiefly from the medial branch of the superficial peroneal nerve. The sural nerve issued conspicuous filaments to the lateral interdigital and metatarsal blood vessels, to the lateral calcaneal arteries and to the talo-calcaneal region. These findings provided a firmer anatomical basis for the interruption of the vascular nerves of the dorsum and sides of the foot by blocking with analgesic agents or by crushing the superficial peroneal, sural and saphenous nerves above the ankle.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
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  • 115
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The rate of skeletal maturation as indicated by ossification of bony elements of the central and appendicular skeleton was compared in two groups of hypothyroid young rats, raised at 20°C and 30°C constant environment respectively.Hypothyroidism was induced by feeding 0.2% propylthiouracil mixed with the food in powdered form to pregnant rats starting on the fifteenth day of gestation and continuing this treatment to the suckling mother until their litters had reached weaning age.The appearance of epiphyseal centers, of carpal and tarsal centers, middle phalanges and femoral and tibial processes and caudal vertebrae 7-27 is delayed in hypothyroid newborn rats over that of normal controls. Hypothyroid rats raised at 20°C lag more severely behind the controls with respect to skeletal maturation, than do hypothyroid rats raised at 30°C. The latter are intermediate or in some instances their rate of skeletal maturation resembles that of the control group.The possible significance of the demonstration of diminished requirements for thyroid hormone by the developing rat for studies attempting to identify mechanisms of hormone action in development is briefly discussed.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 116
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A cephalometric radiographic appraisal of vertical skull growth occurring during the interim of one year was made on 71 caucasoid males at the Baylor University College of Dentistry, Dallas, Texas. The subjects were from 22 to 34 years of age. The dimensions assessed were the total skull height, the anterior cranial height, total facial height, upper facial height. and lower facial height. A significant increase was shown to occur in all the dimensions over a period of one year except in the dimension of anterior cranial height. It was concluded that skull growth does occur in male adults after the age generally accepted as that of maturity.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 117
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964), S. 458-458 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Materialart: Digitale Medien
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  • 118
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Four stocks (C, C-57 Bl, DBA and Swiss albino) of mice were fed a high-fat (28%), low-protein (8%), hypolipotropic diet for 3-480 days. Lipotropic activities of supplements of betaine and carnitine were evaluated. There were no strain-limited hepatic responses to the diet or to the action of the lipotropes. Without lipotropic supplements, parenchymal liposis (sudanophilia of frozen sections) was progressively incremental in all lobular zones for approximately 90 days. Subsquently, lobular liposis decreased and the remaining fat was concentrated in the middle zone within cords of fat-laden cells radiating in a stellate pattern. With choline supplemention, liposis was limited to small amounts of fat within cells that composed the stellate pattern. Betaine displayed a level of lipotropic activity approximating one-half to three-fourths that of choline. The lipotropic activity of carnitine was marginal and inconsistent. The combination of betaine and carnitine demonstrated some synergistic action. No parenchymal hyperplasia was observed. The intralobular reticulum increased in some livers, primarily around the central and intercalated veins, but no lobular distortion resulted.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 119
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The anatomical and histological picture following intravenous injections of several concentrations of aqueous solutions of Alcian Blue has been described. Alcian Blue granules can be found in all cases within the reticulo-endothelial cells of the body in lungs, spleen, liver and bone marrow and in the kidney.The greatest concentration of the dye is found within the renal glomeruli. It is in such concentration as to enable one to see individual glomeruli with the 10 × magnification of the dissecting microscope. On high power (950 ×) the dye can be seen as granules within the endothelial cells and podocytes of the glomerulus, as well as in the cells of the glomerular stalk. No Alcian Blue has been identified within the macula densa.Certain difficulties due to the solubility of the dye in sections are mentioned. Present means of meeting them are covered. Also discussed are follow-up studies being undertaken and possible implications of the procedure.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 120
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964), S. 691-697 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Aggregation of acid mucopolysaccharides in normal palates and cleft palates in mouse embryos was studied by various histochemical methods. An “index of staining intensity” was introduced as a mean numerical value derived from the visual grading of all sections of each litter. Animals were killed at 20 different points of gestation period, from thirteenth to seventeenth day. In this manner a composite staining intensity  -  time table could be obtained for both experimental groups. The observed data seem to indicate some correlation between the concentration of acid mucopolysaccharides in palatine shelves and the competence of embryonic mechanism of palate closure.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
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  • 121
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Lymphatic plexuses from certain areas of serous cavities can be injected by a simple procedure which simulates the normal mechanism of absorption. Apparatus consists of a 500 ml filtration flask with side arm attached to a vacuum apparatus. Excised serous membranes are draped over the mouth of the flask and flooded with ink. Vacuum is applied intermittently, resulting in absorption and flow. The method can be applied to frozen and thawed tissue and is suitable for human autopsy material.
    Materialart: Digitale Medien
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  • 122
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Damage produced by the multiple insertion of a needle into a mouse kidney results, in two days, in the stimulation of mitotic activity around the damaged areas, and in the cortex of the contralateral kidney. The mitotic activity in the contralateral kidney cortex approximates that seen after unilateral nephrectomy.Evidence is presented which suggests that the loss of kidney mass associated with the damage is not the cause of the increased mitotic activity in the damaged or contralateral kidneys. The release of stimulatingsubstances from the wound is probably required. This is in contrast to growth produced by unilateral nephrectomy where the loss of kidney mass is the initiating factor.
    Zusätzliches Material: 3 Tab.
    Materialart: Digitale Medien
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  • 123
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 150 (1964), S. 35-50 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Detailed histological and histochemical studies were made on the effect of transection on the perineural epithelium of the peripheral nerves of rat and cat. Histologically and histochemically it has been shown that the perineural epithelium does not undergo any change in the proximal as well as in distal segments of these transected nerves and is maintained as seen in the untransected nerves. These studies also show that the capsule of the muscle spindle is made up of a continuation of the perineural epithelium and maintains its histological structure, as well as its enzyme equipment. Electronmicroscopic evidences are given for the normal maintenance of this epithelium in the regenerating nerve. The only structure which does not show any change when a nerve is transected is the perineural epithelium. It has been pointed out that the perineural epithelial tube plays an important role in conducting the regenerating axons within the neurilemmal tube to the proper sensory and motor endings.
    Materialart: Digitale Medien
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  • 124
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: An infrahyoid, parapharyngeal method of hypophysectomy in the rabbit has been developed. This method is easily learned and the operation can be performed in less than an hour. Complete removal is verified by examination of the sellar contents either with a dissecting microscope or histologically by fixation, embedding and serial sectioning. The operative mortality is about 10%. No hormonal supplements are required postoperatively.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 125
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Suspensions of thymic lymphocytes, 60-80% of which had been labeled in vivo with H3-thymidine, were injected intravenously into 54 homologous rats and 22 isologous mice. Radioautographs2 of blood and of tissues were analyzed. The cells rapidly disappeared from the blood, although less rapidly in the isologous than in the homologous systems. A large fraction was still present in the tissues during the first post-injection day. In the first hour many were arrested in the lung, some of which were later redistributed to other organs. At later intervals the spleen contained the greatest concentration, followed by lymph nodes and bone marrow. Cells were found occasionally in the duodenal mucosa, in mice only, and in no case did they reach the thymus. A few survived in both rats and mice for as long as seven days.Only one labeled cell was seen in mitosis. There was evidence of transformation to erythroblasts in the liver, spleen and bone marrow; to myelocytes in the bone marrow; and to macrophages in the spleen. Label from some of the cells dying in the liver apparently was reutilized by the Kupffer cells.
    Zusätzliches Material: 13 Ill.
    Materialart: Digitale Medien
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  • 126
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Ova were removed from donors 63-68 hours after ovulation and placed in the uteri of pseudopregnant recipients of the same pregnancy age. In transfers of ova from young (2 1/2-6 month) to old (14-18 month) golden hamsters, only 8.3% developed into term fetuses. From old donors to young recipients, 4.5% of ova developed to term fetuses. In transfers of ova from young donors to young recipients, 49.2% of ova developed into term fetuses. There was no significant difference in percentage of fetal development between the two groups containing old females. The difference between these and the control (young to young) group was highly significant.There was a significantly lower number of ova recovered from old donors. At time of transfer, over one-sixth of the ova from old donors consisted of only one to four cells. At seven and one-half days, embryos developing from ova of old donors in uteri of young recipients were retarded and malformed.It is concluded that while the uterine environment in old hamsters appears inadequate to foster normal fetal development, there are also fewer ova ovulated in old females and these ova more frequently develop abnormally.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 127
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 150 (1964), S. 449-461 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The prenatal development of the mandibular joint in mice was studied in fetuses at 15 to 20 days insemination age. The ramus of the mandible can be delineated as early as the fifteenth day by distinct differences in the degree of condensation of mesenchyme at the site of the future joint. The future condylar process of the mandible can be recognized in its relationship to the external pterygoid muscle, inferior alveolar nerve, Meckel's cartilage, pre-cartilaginous alisphenoid process of the future basisphenoid bone, and the anlage of the squamosal bone with its zygomatic process.Differentiation is rapid through the twentieth day of gestation at which time the following major elements of the joint can be recognized: a fibrous intra-articular disc continuous with the tendon of the external pterygoid muscle; a vascular synovial mesenchyme with upper and lower synovial spaces; an ossified squamosal bone with a fibrous joint lining; and a well developed condylar process with good representation of differentiating cells in the zones of chondrification and ossification.Among the elements not yet evident, however, are (1) hemopoietic marrow in the condyle, (2) a constricted neck at the base of the condyle, and (3) a fibrous capsule or capsular ligament.
    Materialart: Digitale Medien
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  • 128
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Thin slices of rat liver, kidney, and M. rectus femoris and thin, flat pieces of albumin-gelatin gels (which approximated the tissue slices in mass, dimensions and protein content) were immersed in formalin solutions at various concentrations, in some cases with variable amounts of NaCl (0.11-0.25M) added, and in some cases buffered at pH values ranging from 3.5-7.0. The slices were weighed at frequent intervals for the first 20 hours of immersion. Weight changes occurred rapidly. With the exception of the neutral buffered formalin curves, three families of response curves were obtained for the three tissues. With both formalin and formalinsaline solutions weight gain was inversely proportional to the solute concentration, but the formaldehyde particles apparently are not involved osmotically. The total osmotic concentration of formalin solutions, therefore, is not a factor in the swelling or shrinking of tissue slices. The presence of contaminants could be responsible for the effective osmotic concentration observed with these solutions. The weight response of slices is influenced by the pH of the formalin. Although the response of the gel system to any particular solution was quantitatively greater, it was qualitatively the same as the tissue slice response.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
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  • 129
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The numerical variations observed in the dentition of the northern sea lions, fur seals and seals are summarized as follows: (1) There is a reappearance of the right maxillary second molar in the northern sea lion dentition and of the first deciduous premolar in the fur seal dentition, which may be interpreted as examples of evolutionary recession towards the full mammalian dentition. (2) There is a complete tooth reduction of the molars in the sea lion dentition. (3) There is the presence of a “Dentes geminati” of the second premolar and the supernumerary tooth in the right upper jaw and of the supernumerary tooth between the second and third premolars in the left upper jaw of an adult fur seal, which may be associated with the division of the second premolar tooth germ. (4) There is an appearance of a pair of supernumerary teeth lying lingually to the root of lower permanent central (second) incisors, being of interest in suggesting that they are either the appearance of the successors of the recent central incisors or the reappearance of the permanent first incisors, in the fur seal dentition. (5) There is a tooth reduction in the permanent dental formula from \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm I}\,\frac{{\rm 3}}{{\rm 2}}{\rm C}\,\frac{{\rm 1}}{{\rm 1}}{\rm P}\,\frac{{\rm 4}}{{\rm 4}}{\rm M}\frac{{\rm 1}}{{\rm 1}}\,{\rm to}\,{\rm I}\,\frac{{\rm 3}}{{\rm 1}}{\rm C}\,\frac{{\rm 1}}{{\rm 1}}{\rm P}\,\frac{{\rm 3}}{{\rm 4}}{\rm M}\frac{{\rm 1}}{{\rm 1}} $\end{document} in the seal, which was associated with a “Dentes confusi” in the same category of the dentition.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
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  • 130
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 15-27 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The A-V node of the dog is composed of closely interwoven fibers which frequently connect with each other within a sparse collagen framework. Fibers from the interatrial septum enter the posterior half of the node along its superior and posterior margins, while the anterior half of the node is isolated from such connections. In addition there are fibers from the interatrial septum which bypass these marginal atrionodal junctions and instead enter the convex surface of the node, which lies beneath the right atrial endocardium. These bypassing fibers circumvent most of the interweaving fibers within the A-V node. At the posterior margin of the node, lying between it and the coronary sinus, there are ganglia and nerves, with the nerve fibers extending anteriorly through the A-V node into the A-V bundle. The only major anatomic difference between the human and canine A-V nodes is their arterial blood supply, that of man being derived from one source originating from the right coronary artery and that of the dog being from two sources, both of which originate from the left coronary artery.
    Zusätzliches Material: 13 Ill.
    Materialart: Digitale Medien
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  • 131
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 1-14 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: In the testes of man and some other mammals a structure is formed during reproductive age, designated a “receptacle”. This structure which is not present during infancy represents the first communication of the seminiferous tubules to an extragonadal organ the rete “organ,” the receptacles received the mature spermatozoa which later are transported to the mesonephric excretory duct through the rete tubules. The receptacles are the distal end of the rete tubules and are considered as coelomic funnels.The epithelium of the receptacles, the tubuli recti and rete tubules is identical in infantile and mature testes and of a different type than the epithelium of the seminiferous tubules.The receptacle consists of a distal dilatation of the tubuli recti in which the seminiferous tubule invaginates following the ruptures of their walls. Identical receptacles are present in man, horse (Equus caballus), armadillo (Dasypus novemcinctus mexicanus), white-tailed deer (Odocoileus virginianus), dog (Canis familiaris), cat (Felix domesticus), hamster (mesocricetus auratus) and woodhuck (Marmota monax). In the mule (sterile offspring of a mare and a jackass) the receptacles lack communications.The presence of mature spermatozoa is believed to be the proper stimulus for the formation of the receptacles which established the communications between the seminiferous tubules and the rete tubules.The receptacles, tubuli recti and rete testis are part of an organ which accomplished the connection of the gonad to its mesonephric excretory system.
    Zusätzliches Material: 17 Ill.
    Materialart: Digitale Medien
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  • 132
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 115-119 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: NOrmal and atypical follicular structures were classified and counted in the ovaries of guinea pigs 3 to 11 weeks of age. The per cent of primary and secondary follicles remain almost constant throughout the period of observation. Corpora lutea appeared at the fifth week and reached what appeared to be the mature level by the sixth week. The per cent of follicles having polynuclear ova reached an early peak at four weeks and decreased sharply at five weeks postpartum. The per cent of polyovular follicles increased to a low peak at nine weeks and decreased in frequency thereafter. The frequencies of atretic follicles with polynuclear ova and of quency thereafter. The frequencies of atretic follicles with polynuclear ova and of atretic polyovular follicles were significantly higher than that of atretic normal follicles. The results of this study were compared to simular observations on the Swiss mouse, Golden Hamster and Sprague-Dawley rat. The data were discussed in relation to gonadotripic hormone levels.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 133
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 149-159 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A marginal sinus, formed by the anastomosed terminations of white pulp capillaries, bounds the inner edge of the marginal zone. The endothelial lining on the nodular surface is complete. Pores appear along the lateral aspect thus allowing blood to pass freely into the interstices of the marginal zone. A dense aggregation of Marshall's metalophil cells occurs in the region of the marginal sinus. Such cells are lacking in the marginal zone.Intravenous injections of particulate matter were used to determine the course of blood flow and phagocytic potential. Ten minutes after injections, particles were found to be dispersed among the cells of the marginal zone. None were found in the marginal metalophils. In four hours the particles had cleared the marginal zone and were within red pulp macrophages. In a few rats, the marginal metalophils reacted positively to tests for iron. It is concluded that marginal metalophils represent a large reserve of potential phagocytes situated at a point where blood first leaves capillaries to enter tissue interstices.
    Zusätzliches Material: 27 Ill.
    Materialart: Digitale Medien
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  • 134
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 129-137 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Congenital malformations of the hamster eye, consisting of microphthalmia and anophthalmia have been noted consistently in the offspring of pregnant hamsters treated with intravenous injections of colchicine, Vinacaleukoblastine (VLB) and Vincristine (VCR) on the eighth day of gestation. In an attempt to compare the mitotic-arresting activity of these three compounds on the lens and retina of the fetal hamster eye, various concentrations of the drugs were injected into pregnant hamsters on the fourteenth day of gestation and the fetuses recovered after three hours. Mitotic counts were done on comparable sections of lens and retinas of the fetuses. Colchicine has the most marked mitosis-inhibiting activity of these three drugs. The most effective mitosis-inhibiting dosage of colchicine also correlates with its most effective teratogenic dose. VLB and VCR do not inhibit mitosis in the fetal hamster eye as markedly as colchicine and their most effective mitosis-inhibiting dosages are equal to or above levels which cause a 95-100% embryonic mortality. It is possible that some common biological mechanism other than inhibition of mitosis may be responsible for the similar teratogenic activity of these compounds. The natural resistance of the golden hamster to colchicine does not appear to be manifest in the developing embryos in utero.
    Zusätzliches Material: 12 Ill.
    Materialart: Digitale Medien
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  • 135
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 139-147 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Body weight and length, weights of 14 organs and 15 linear measurements are presented from 97 Amblystoma tigrinum melanosticum before metamorphosis and 57 specimens after metamorphosis. These data are compared with similar measurements (previously published) on adult salamanders.Body weight and weights of the digestive tube and its subdivisions, liver, pancreas, spleen, eyeballs and brain are heavier in the larvae. The body weight decreases more than many of the organs and hence the percentage weights of the heart, lungs, liver, spleen, kidneys, gonads, eyeballs and brain are larger, relatively, in the post-metamorphosis salamanders.Since body length is not significantly changed, the percentage lengths are much the same. Length of the digestive tube and its parts, jaw width and the width of the body at pectoral, belly and pelvic regions are all longer in the larvae. The limbs are the only percentage lengths greater in the post-metamorphosis salamanders.All of the weights and all of the linear measurements are significantly correlated with body weight or length, respectively.Four organs show increases in percentage weights at all three periods: gonads, lungs, liver and spleen. Two others have an increase in post-metamorphosis: heart and kidneys. The digestive tube and its parts and the pancreas have a relative decrease at the end of metamorphosis. The eyeballs are relatively largest in the post-metamorphosis, and smallest in the adults.
    Zusätzliches Material: 4 Tab.
    Materialart: Digitale Medien
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  • 136
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The weights of 75 human fetal thyroids were analyzed in relation to crown-rump length, foot length, weight, and estimated gestation age. The ratio of thyroid weight to body weight was lower in the smaller fetuses and gradually increased until the fetus was 70-90 mm in crown-rump length when the ratio attained a value close to that found in the newborn and adult. This period of development when the relative weight of the thyroid becomes constant coincides with the time of appearance of colloid and the onset of ability to concentrate iodine.A comparison of estimated age of fetuses in the Danish material and the formalin-fixed fetuses from the Carnegie Collection shows the Danish fetuses under 40 mm in crown-rump length to be four to six days older than the average given by Streeter. Streeter may have made his average too low and probably the relative ages of the two groups are comparable.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
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  • 137
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964) 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 138
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Experiments reveal that growth reactions may be evoked in amputated forelimbs of fully adult Rana pipiens and R. catesbiana by electrical stimulation of the normal limb nerve supply. The evoked growths were generally small cones, 5-10 mm in length; none developed into limbs of normal size and morphology, but some formed digits and cartilage and developed striated muscle. The combined influences of trauma, effected by salt treatment, and electrical stimulation of the nerve produced more growths than trauma or stimulation alone.
    Zusätzliches Material: 27 Ill.
    Materialart: Digitale Medien
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  • 139
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Fifty day old Sprague-Dawley rats were given sodium fluoride (50 mg/kg) and killed at times between one half hour and 32 days after injection. Transverse sections of the upper incisor 40 μ thick were radiographed, demineralized and stained with hematoxylin and eosin. The response seen in hematoxylin and eosin stained material agreed with previous descriptions of the “calciotraumatic response” and consisted of three components. However, in the radiogram only two components could be distinguished: an external hypermineralized zone and an adjacent hypomineralized zone. The radiographic response was first recognized four hours after injection as a narrow zone of hypermineralized dentin at the dentin-predentin junction. When the radiograms were compared to the H and E stained sections in animals killed up to 19 hours after injection, two important features were observed: (1) the width of the predentin had increased markedly, and (2) the hypermineralized zone had increased to its final width. This was interpreted as concurrent formation of both hypermineralized and hypomineralized components. At 24 hours normal dentin formation had resumed. Since both components were forming simultaneously it is believed that sodium fluoride does not cause the response by interfering with the humoral mechanisms of mineralization, but, rather, its effect is most likely on collagen or ground substance.
    Zusätzliches Material: 13 Ill.
    Materialart: Digitale Medien
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  • 140
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 485-497 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The secretion of protein by the acinar cells of the pancreas occurs in two steps: the synthesis of the protein from amino acids and its migration through the cell to the acinar lumen. Since very soon (one minute) after the injection of leucine-H3 the labeled protein is found mainly in the ergastoplasm of the basal half of the cell, protein synthesis is believed to occur in this location. At later intervals the labeled protein is found in the Golgi complex (10 and 30 minutes), and then in the zymogen granules of the apical half of the cell (60 minutes). The newly synthesized protein thus migrates from the ergastoplasm to the Golgi complex, and from there as zymogen granules through the apical half of the cell prior to being released in the acinar lumen.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
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  • 141
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 499-501 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The volumes of parenchymal cells and their nuclei in liver were calculated in white rats, Columba livia (rock pigeon), Calotes versicolor (garden lizard) and Bufo melanostictus (toad); from their optical area and cell thickness. The area was measured from camera lucida drawings. The largest cellular and nuclear volume was observed in rats and smallest in pigeons. The cell volume in toads was similar to that found in rats but they had smaller nuclei. The cellular and nuclear volumes in lizards were smaller than in toads; and in pigeons smaller than lizards. The significant difference, in both cellular and nuclear volumes that has been observed in different classes of vertebrate, cannot be correlated with the evolutionary changes.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
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  • 142
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 503-505 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: UDPG-glycogen synthetase was studied in the uterus of ovariectomized and ovariectomized-hormone treated rabbits and in the tongue. Following the biochemical technic of Leloir and Goldenberg it was not possible to demonstrate the enzyme in the uterus of the ovariectomized or ovariectomized treated animals. However, in the tongue the enzyme was present. The data from this study along with previous histochemical studies indicates that the glycogen in the uterine muscle is not synthesized through the UPDG pathway, but is synthesized from G-1-P by the action of phosphorylase. Since UDPG-glycogen synthetase can be demonstrated in the tongue a difference seems to exist in glycogen synthesis between the smooth muscle of the uterus and skeletal muscle of the tongue.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
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  • 143
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964) 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 144
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The course of development of parabiotic anastomosis was followed with respect to time in Holtzman (Sprague-Dawley) parabionts. Comparison of non-irradiated pairs was made to pairs in which one of the partners had received 800 r. The development of the anastomosis was studied by determining the per cent transfer of CR51 labeled erythrocytes (which represented a cellular element) and radio-iodinated serum albumin (which represented a molecular element) from one partner to the other. Erythrocytes were found in the non-injected animal in small numbers at 22 hours after pairing; at 47 hours the rate of transfer became much more rapid. RISA was detected in the non-injected partner as early as five hours after pairing and accumulated steadily thereafter. Irradiation had no effect on the course of development of the parabiotic anastomosis as evidenced by similarity of accumulation rates of Cr51 labeled erythrocytes and RISA when compared to the non-irradiated pairs.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 145
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964), S. 23-35 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A light and electron microscopic study of the early changes which occur in cadmium necrosis of the testis of the mouse was made in an effort to identify the site of action of cadmium. Mice were given a single, intraperitoneal injection of 1% CdCl2 at a dosage of 0.1 ml/10 g body weight and then the testes were fixed for light and electron microscopy at various hourly intervals. The earliest changes which were appreciated by light microscopy consisted of an edema of the intertubular spaces, congestion of blood vessels, and an increased amount of granular precipitate in the connective tissue spaces. By electron microscopy the earlies changes were observed in the endothelium of the testicular vascular bed and consisted of a striking and rapid increase in the prevalence of pinocytotic vesticles suggesting an increased interchanges of fluid between the blood and extravascular spaces. All of these changes preceded any appreciable alteration in the cells of the seminal epithelium. The fact that the earliest alterations are observed in blood vessels suggests that the site of action of cadmium in the production of testicular necrosis is upon the endothelium of the vascular bed.A comparative series of animals (frog, pigeon, rooster, armadillo, opossum) was also investigated as to their susceptibility to the toxic effects of cadmium. the results from these species, and other species reported by previous investigators, suggest the generality that cadmium necrosis is a phenomenon common to species possessing scrotal testes and absent from those possessing abdominal testes. The opossum is an exception to this generality. These findings are discussed in relation to the blood supply of the testis.
    Materialart: Digitale Medien
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  • 146
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A simple, rapid method is presented which permits qualitative evaluation of osteogenesis in tissue culture. Eleven-day embryonic chick tibiae, with distal and proximal condyles removed, were grown in organ culture for two weeks. Explants demonstrated subperiosteal osteogenesis, bridging of fracture defects, and formation of bone, de novo, over the cut cartilaginous end surfaces of explants.The method presented herein has several advantages over those previously described and may be adopted for an in vitro assay of materials to determine direct effects on osteogenesis. Large quantities of explants can be prepared easily and cultured to yield consistantly abundant quantities of osteoid. Bone which is formed over ends of anlage is particularly significant by virtue of its position. New bone formed elsewhere in explants, with the possible exception of the fracture sites, however, is difficult to distinguish from bone present before onset of cultivation. Further more, osteogenesis which occurs over the cut cartilaginous ends after a week of culture, probably results from favorable environmental conditions in vitro and not from cellular activity “preprogrammed” in ovo.In addition to osteogenesis, alteration of cartilage cells and matrix were observed in this system. Chondrocytes in the cut ends of the anlagen became spheroidal and resembled osteoblasts. Bone formation, however, was not observed about these cells. In and about lacunae of degenerating chondrocytes at the ends of the anlagen, collagen fibers appeared.
    Materialart: Digitale Medien
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  • 147
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Pregnant mice of Swiss ICR/Ha and the A/St and the C3H/He inbred strains were given thalidomide by oral intubation for four or five days beginning six or seven days postconception. Congenital anomalies including skeletal malformations were induced with doses of 31 to 250 mg of thalidomide per kg of body weight. Skeletal malformations of the long bones, head and trunk were seen in radiographs; soft tissue malformations were limited to structural malformations of the brain, seen in histological preparations.Because of the relatively small number of Swiss and C3H mice used, no attempt was made to discern the severity or pattern of malformations presented by each strain.
    Zusätzliches Material: 3 Tab.
    Materialart: Digitale Medien
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  • 148
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Thalidomide injury to an implanted armadillo blastocyst is presented. This finding confirms the specific damage by thalidomide to the embryoblastic cells. The lack of damage to the trophoblast at this stage permits a normal implantation of the blastocyst in the uterine mucosa.
    Materialart: Digitale Medien
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  • 149
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A method for rapid freezing is described in which use is made of the good heat conducting properties of silver. The freezing was accomplished by bringing the tissue in contact with a polished silver surface at the temperature of liquid nitrogen either at atmospheric or reduced pressure. Helium gas flowing over this surface prevented the condensation of water or air on the silver. After freezing the tissue was placed in a substituting solvent. The best results were obtained with 2% osmium tetroxide in acetone at -85°C. The ultrastructure of the tissue was well preserved in a narrow surface layer only.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 150
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964), S. 405-410 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Methods are described for the isolation of two separate fractions from guinea pig thymus gland; i.e., Hassall's corpuscles and stromal segments. Hassall's corpuscles are relatively dense epithelial aggregates sedimentable at low centrifugal acceleration, while the lighter stromal segments remain in the supernatant fluid. Solubilization of the thymocytes, effected by high-speed homogenization in hypertonic glycerol, is unaccompanied by visible gelation or nuclear residue. Glycerol-sensitivity resembles radiation-sensitivity in many respects.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
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  • 151
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964), S. 443-447 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The mesonephric duct was studied in female camel fetuses (Gärtner's duct). All fetuses were well developed, aged from two to three months. The female internal genital organs were sectioned at 10 μ and stained with hematoxylin-eosin or Van Gieson's stain.In camel fetuses, the duct is usually lined with one layer of cuboidal or columnar epithelium which may be ciliated. Degeneration and cavitation occur in the lower vaginal part, which finally obliterates the previous structure, or changes it to many layers. These two processes occur in succession at different levels of the vaginal portion and are not uniform stages along the whole duct. The appearance of the duct is variable at different levels and at the same level in different ducts. The two ducts may leave the submucosa superiorly and enter the musculature of the vagina at different levels. No glands opening into the mesonephric duct were observed. The upper (mesosalpingeal) part is smaller in caliber than the lower and seems to be immune to the obliteration and cavitation mentioned.
    Materialart: Digitale Medien
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  • 152
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964), S. 485-489 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Materialart: Digitale Medien
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  • 153
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The four pharyngeal pouches, pharyngeal grooves, and closing membranes of the dog form in an antero-posterior sequence but the encroachment of head mesoderm which results in obliteration of the closing membranes occurs in a posteroanterior sequence. No pharyngeal clefts are formed. The anlage of the auditory tube arises as a dorso-lateral extension from the dorsal surface of the first pharyngeal pouch and expands into an elongated tube directed toward the developing ear. The second pharyngeal pouch develops into a distinct tonsillar sinus dorso-lateral to the base of the tongue. The palatine tonsil extends into the tonsillar sinus, and both become covered by a fold of epithelium. The third pharyngeal pouch extends medially toward the developing thyroid after contacting the cervical sinus. The distal tip of the third pouch differentiates into Complex III which transforms into parathyroid III and thymus III. The distal tip of the fourth pharyngeal pouch, Complex IV, also extends in a medial direction after contacting the cervical sinus. Complex IV transforms into parathyroid IV and the ultimobranchial body.
    Materialart: Digitale Medien
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  • 154
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Procedures for experiments on the embryo of the turtle are described. Methods of obtaining the gravid females, their handling, and preoperative preparation of the egg are described. The actual operation can be carried out much as it is done on the chick embryo. Post-operative care is described. Survival can be satisfactory. Hazards of the procedure are discussed and means of controlling them indicated. Most of the experiments were done with embryos of the common snapping turtle, Chelydra serpentina. A few experiments were done with embryos of the painted turtle, Chrysemys picta, and of the soft-shelled turtle, Trionyx spiniferus. The embryos of the painted turtle promise to be well suited to use for experimental studies. The soft-shelled turtle is not such a promising form.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 155
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Large intracellular ice formations are assumed to be more damaging than small ones. Nuclear alteration, such as pycnosis, generally is considered a reflection of reduced vital cellular functions. Evidence is presented which shows, on the basis of rate of oxygen consumption, that survival of kidney cells is greater after the formation of large rather than small intracellular ice artifacts, and that nucelar alteration such as pycnosis does not indicate the degree of damage to a vital function, their respiratory activity. Findings agree with those based upon autotransplantation of skin (Anat. Rec., 144: 171-191, '62). It is suggested that mitochondria are one of the cellular sites of freeze-thaw injury and that the mechanism of freezing injury may differ in nucleus and ctyoplasm.Microscopic appearance of ice artifacts formed in cells of mouse kidney slices after slow (1.5° and 3.0°C/min) and rapid (19° and 38°C/sec) freezing to -75° and -196°C was preserved by the author's freeze-drying method. Control (unfrozen) and frozen-thawed slices were fixed in Bouin's fluid and processed routinely for study of microstructure. Oxygen consumption of parallel groups of control and frozen-thawed slices was measured by the conventional Warburg manometric technique. The data revealed that: (1) the size of intracellular ice artifacts was 5 to 17 times larger in slices frozen at slow than at rapid rate; (2) Q02 of cells in slowly frozen tissue slices (average of 21% of control Q02) was significantly greater than rapidly frozen cells (average of 9% of control Q02); (3) Nuclear pycnosis, crenation and vacuolation were more extensive in cells which were frozen slowly.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
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  • 156
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964), S. 623-649 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Human embryonic myocardial tissues ranging from eight to eighteen weeks of development were prefixed and dissected in buffered formaldehyde, postfixed in buffered OsO4 and processes for Epon embedding. At these stages of development the myocardial cells contain an abundance of sarcoplasm with a sparse random distribution of myofibrils that frequently appear branched. The A, I and Z bands exhibited in the adult myocardial cells are also observed in these stages of development. However, the M line is only slightly apparent, while no H band was observed. The mitochondria are not arranged in parallel arrays as found in the adult, but appear to be randomly distributed throughout the interfibrillar sarcoplasm. An array of tubules, cisternae and vesicles that comprise the sarcoplasmic reticulum is also distributed throughout the interfibrillar sarcoplasm. In some areas this tubular system appears as vesicles with small dense granules along its outer surface, while in other areas it appears smooth. The distribution and orientation of the sarcoplasmic reticulum is far less pronounced in the embryonic stages examined in this study than that reported for the adult myocardium. Dense granules (150 to 350 Å) appear as clusters or aggregates of granules in the sarcoplasm and are similar to the glycogen granules described by other investigators. The intercalated disc is observed at the junction of two opposing cells and occurs with less frequency than the intercalated disc in the adult myocardium.
    Materialart: Digitale Medien
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  • 157
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Histological techniques were used to obtain fiber counts, capillary counts, fiber diameters, and capillary-fiber ratios in the adult rat heart. Based on measurements of 3,600 fibers in six rats, the means and standard deviations of the fiber diameters for the left and right ventricles were 11.8 ± 4.8 and 11.5 ± 4.3 μ respectively. The corresponding capillary-fiber ratios were 0.92 ± 0.23 and 0.90 ± 0.33. The differences between the right and left ventricles were not statistically significant. Statistical analysis was used to evaluate the reproducibility of the results. The frequency distribution of the fiber diameters was found to be unimodal in both right and left ventricles suggesting that only one group of fiber sizes is involved. It was found that fiber counts could be used as an indication of fiber size under ordinary conditions provided that the total number of fibers counted is over 200.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
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  • 158
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A technique was devised for obtaining marrow-free trabecular bone so that the trabecular and cortical bone composition of dog, steer, monkey and man could be studied. Vertebral body was cut in the frontal plane into slices 2 mm thick with an electric band saw. The cortical bone encrircling each slice was trimmed off with a cleaver, leaving intact a lacy slice of trabecular bone. The marrow substance was washed away by fine and powerful jets of tap water obtained from an adjustable nozzle. Marrow washing was discontinued when no trace of red color was visible on holding the slice in front of a strong light source.The quantities of water, volatile inorganic, organic and ash fractions in cortical bone was alike for all species. Likewise, the trabecular bone fractions of each was quantitatively similar. In general, density and amount of ash in cortical bone was higher than that in trabecular bone. The water and ash:organic ratio were higher in trabecular than in cortical bones.Ratios of trabecular to cortical ash for the bones in an entire dog skeleton were also determined. Based on this, volume or mass of the various bone fraction may be estimated when the weight of the ash for any particular bone is known.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 159
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The in situ thymus of the guinea pig was labeled locally with H3-thymidine and sections of various tissues analyzed by radioautography for the location of labeled cells which might have left the thymus from 30 minutes to three days after labeling. Labeled lymphocytes were located especially in the mesenteric lymph nodes and spleen, giving direct evidence for the migration of thymocytes under near-physiological conditions. Only a few cells were found in the bone marrow, and none in the liver. The identified cells were not seen to be undergoing subsequent proliferation, but about one-fourth of them were transforming to other cell types - plasma cells, heterophil granulocytes, reticular cells, and macrophages. The fate of another portion of the cells seemed to be loss to the gut lumen through the mucosa. These data suggest that a normal function of the thymus of the adult guinea pig is the proliferation of a population of pluripotential stem cells which, after migration to other tissues, may further differentiate under appropriate stimulus. Possible applications of the local labeling technique are indicated.
    Zusätzliches Material: 15 Ill.
    Materialart: Digitale Medien
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  • 160
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 150 (1964), S. 243-247 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: To ascertain the pathway (s) along which forces are conducted from the hand to the humerus in the human cadaver specially designed pressure sensitive transducers were introduced into the radio-capitular and ulnar-trochlear components of the elbow joint. A constant force was applied to the hand, and changes in electrical resistance and hence pressure across the elbow joint where recorded. It was observed that 57% of the force applied crossed the radio-capitular joint while 43% crossed the ulnar-trochlear joint. The pathway of this force transmission is discussed with particular reference to the involvement of the interosseous membrane.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
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  • 161
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 150 (1964), S. 257-263 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Implants from the midbrain and cerebellum of neonatal rats were cultured in roller tubes for 20 to 30 days. The cultures were incubated in a tryptamine-tetrazolium solution which demonstrated the enzyme activity of monoamine oxidase (MAO) by the formation of a formazan precipitation. Some cultures were incubated without fixation, while others were fixed in a glutaraldehyde solution prior to incubation. The specificity of the reaction was controlled by withholding the substrate or by treatment of the cultures with an MAO inhibitor. An intracellular localization of the enzyme was observed in small and medium sized neurons, but was absent in the largest neurons. Neuroglial cells, including ependyma, and mesenchymal cells and phagocytes were MAO positive. The formazan granules were scattered throughout cell bodies and into cytoplasmic processes. Glutaraldehyde fixation of cultures prior to incubation for MAO preserved the details of cell structure and enhanced the differentiation of cell types. When fixed and unfixed cultures were compared, glutaraldehyde did not appear to interfere or interact with enzyme localization; however, there was evidence that this aldehyde might be interfering with MAO concentration, since a longer incubation period for prefixed tissue was required to obtain a formazan reaction comparable to that of unfixed cultures.
    Materialart: Digitale Medien
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  • 162
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The effects of hyper- and hypothyroidism on fetal development and on the postnatal maturation of the central nervous system was studied in the rat. Our observations indicated that the development of the rat fetus, as measured by birthweight and skeletal maturation of the newborn animal is not markedly influenced by presence or absence of thyroid hormone during the prenatal stage.Availability of thyroid hormone is a more critical factor with respect to maturation of the nervous system taking place in the postnatal animal.Delay in cerebellar maturation and delay in increase in dry weight of cerebrum and cerebellum were noted in hypothyroid rats. A transitory acceleration of oxygen consumption of these structures during their maturation was also noted in hyperthyroid litters.A more permanent suppression of learning behavior and of the thermoregulating mechanism was observed in young hypothyroid rats deprived of thyroid hormone since birth.It is concluded that requirements for thyroid hormone during development of the rat are limited to a critical period coinciding with the first two to three weeks of postnatal age.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
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  • 163
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 150 (1964), S. 195-207 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Cholinesterase (ChE) distributions in the epithelial and smooth muscle cells and in the peripheral nervous plexus of the reproductive ducts of the male rat are dependent on male sex hormones. Castration results in establishment of a low maintenance level of apical enzyme activity in the epithelial cells; smooth muscles and the nerve plexus of the vas deferens and cauda epididymidis also show reduced enzyme reactions. Testosterone treatment restores the normal enzyme relations in the epithelium and smooth muscles. Estradiol is partially effective, but reaction intensities do not attain normal distrbutions and proportions. Reductions in relative numbers of ChE positive nerve plexus fibers and their enzyme reactivity, and recession to outer muscle layers occur in castrates, but better recoveries follow after testosterone than after estradiol treatments. The results are interpreted to be in agreement with other data relating to smooth muscle behavior and its neural and hormonal regulation. Epithelial cell differentiation is complete in testosterone treated castrates, but is incomplete in estradiol treated cases, although ChE synthesis and duct growth occurs in the latter.
    Materialart: Digitale Medien
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  • 164
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A comparative histological and histochemical study of the gastric mucosa was done with the frog, mouse, rat, hamster, guinea pig, rabbit, cat, dog and man. Enzymatic histochemical studies were done to demonstrate acid phosphatase (PbS and azo-dye methods), thiamine pyrophosphatase (TPP-ase) and NADH2 tetrazolium reductase activity. Cytoplasmic organelles were stained in some cases by three of the above methods i.e. acid phosphatase (PbS) activity marked the lysosomes, TPP-ase activity marked the Golgi apparatus and NADH2 tetrazolium reductase activity marked the mitochondria. The acid phosphatase activity of the four major cell types was markedly different in the various species. The activity shown by both methods in individuals of a given species coincided well except in the rabbit and the dog. TPP-ase activity demonstrated the Golgi region in the surface cells of all species except the guinea pig and the frog. The Golgi zones of zymogen cells showed strong activity only in the cat, while the parietal cell Golgi was not demonstrated in any of the species. NADH2 tetrazolium reductase activity in the parietal cells was strong in all animals except the mouse and the rat where staining was faint. The relationship between the lysosomes and the Golgi apparatus, as demonstrated histochemically in the gastric cells of the nine species, is discussed. The functional significance of these different enzymatic patterns has yet to be determined.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
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  • 165
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 150 (1964) 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Materialart: Digitale Medien
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  • 166
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 150 (1964), S. 417-421 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Rudimentary cilia were found on fibroblasts of a human brain tumor examined in the electron microscope. These cilia apparently have their origin in the centrioles of the fibroblasts; both centrioles appear to be involved in formation of cilia in most instances observed. Because of their atypical appearance and confinement by adjacent cell processes, it is unlikely that these cilia can perform any useful motor function for the cell. The cilia may serve as an expression of the morphogenetic potential of centrioles.
    Materialart: Digitale Medien
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  • 167
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964) 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Materialart: Digitale Medien
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  • 168
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Thymus of guinea pigs and C3H mice was fixed in 1% osmium tetroxide, embedded in Araldite or Maraglas, and studied under the electron microscope.Hassall's corpuscles showing the typical concentric, lamellated pattern are observed. Reticular cells form layers around central elements of variable appearance. One or more reticular cells or cystic structures often constitute the centers of corpuscles. Nuclear degeneration, swollen cytoplasm, and intracellular fibrils are characteristic findings. Desmosomes may be quite numerous and may cover a large portion of a cell's surface. Intracellular fibrils are particularly dense at membranous sites and often are apparently unrelated to desmosomes. Reticular cells at the periphery of thymic corpuscles may be contiguous with cells of the cytoreticulum. Many reticular cells contain organelles generally associated with protein synthesis or active transport.Intercellular and intracellular cysts are regularly seen and are frequently related to thymic corpuscles. Some cysts may be manifestations of cell synthesis and storage.The epithelial nature of thymic corpuscles and cysts is evident. Thymic corpuscles may arise by localized collapse of the cytoreticulum.
    Zusätzliches Material: 14 Ill.
    Materialart: Digitale Medien
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  • 169
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The perineal pigment spot of the C57 Black mouse was examined macro- and microscopically in animals ranging in age from 14 days post-fertilization to 28 days post-parturition. Dendritic pigment-containing cells first become evident in the dermis of the area on the sixteenth day post-fertilization. Throughout later stages of development, these pigmented cells continue to be restricted to the dermis of this area. Since the dopa treatment reveals the presence of a melanin synthesizing system within these cells, they are true melanocytes which have become restricted to this layer of the integument.Histological examination reveals a population of melanocytes in the epidermis and/or hair follicles also. These are rarely found over the center of the area but are seen in increasing numbers laterally from the ventral midline. In contrast, dermal melanocytes are heavily concentrated near the ventral midline but decrease in numbers laterally. There are, therefore, two opposing but complementary gradients of melanocytes in the integument of the pigment spot. This suggests the possibility that a precocious differentiation of the basement membrane in this area during embryonic development inhibits the passage of melanoblasts into the epidermis thereby causing them to be restricted to the dermis.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
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  • 170
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 67-74 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Neuroanatomical nuclear configuration corresponding to the projection regions for the chorda tympani, the IXth, and the lingual nerves was studied in the cat thalamus by a combination of electrophysiological, stereotaxic, and histological techniques. Each of the three nerves innervating the tongue was dissected for stimulation in cats deeply anesthetized with Nembutal. Maps of the extent of the thalamic projection for a particular nerve were obtained by recording evoked potentials in the thalamus during the stimulation of one of these nerves. Such maps were correlated with the anatomical structures of the cat thalamus by reconstructing the recording sites from histological sections of the cat brain. It was found that the chorda tympani and the IXth nerve projection regions correspond closely to the ventromedial nuclear complex with slight encorachment on the lingual nerve projection region in the ventrobasal complex. The most medial portions of the taste nerve projection regions do not relay any tactile afferent impulses and the most lateral portion of the lingual nerve projection is not activated by impulses in the taste nerves. Therefore, it is suggested that the thalamic relay of taste is not coextensive with other lingual modalities in the cat thalamus but it has an independent representation in the ventromedial nuclear complex.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
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  • 171
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 75-79 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Analysis of age changes in physical characteristics of mouse limb bones requires a sensitive, consistent and relatively simple apparatus for determination of transverse breaking strength. The developed instrument is essentially a one meter counter-balanced 4-to-1 lever with a tracked, motor-driven weight on its upper surface. At the beam's short end a loading tool impinges upward on a bone mounted in an adjacent holder; at the opposite end is a mercury switch connected to a relay halting the weight motor when fracture occurs. Bones, with proximal ends embedded in convex securing blocks of impression medium, may be positioned in a standard relationship to the holder, loading tool edge, and the balanced beam.Repetitive loading of a steel spring indicates instrument error of 1.8%. Preliminary tests with a random series of paired mouse femora show no significant difference between left and right bones. In the long-term study it will be possible to correlate physical strength with other characteristics of opposite bones.An air-gap capacitor across loading tool and bone holder and coupled to a variable frequency oscillator permits monitoring of specimen elasticity on a strip-chart recorder.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 172
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 103-109 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A malformed human fetus with multiple congenital anomalies including absence of an umbilical artery is described. These anomalies include malpositioning of the apex of the heart; a “mirror image” position of the liver; mal-rotation of the gut with absence of external demarcation into small and large intestine; failure of development of the cloacal region with imperforate anus and absence of a urethra; undescended testes and bilaterally mal-placed scrotal sacs, but the presence of a median phallus in spite of the failure of the ventral abdominal wall to develop fully.Factors known to influence the production of fetal anomalies in man and animals are discussed and a brief review of the literature on single umbilical arteries, which are known to be associated frequently with congenital anomalies, is given.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 173
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Electron microscopic studies reveal that the red pulp of the rabbit spleen is composed of reticular cells, reticulum and elements of the blood circulating through it. The three types of reticular cells described follow no definite pattern as to types of spaces they line and are not always adjacent to a basement membrane. Similar or dissimilar cells may line a basement membrane on the same or opposing sides. The entire red pulp area is intercommunicating through pores and junctions of the several spaces and in that area in which no basement membrane exists, the cytoplasmic projections of the reticular cells form a meshwork of spaces. Terminal arterioles are seen to end in collapsed type channels with a change from endothelium to Type I reticular cells. These rapidly join dilated areas. The reticular network of the spleen appears as four types: homogeneous, fibrillar, a combination of these, and reticular cells only. Isolated cilia are found in the reticular cell cytoplasm and are shown to be associated with a basal body and a centriole. The investigation supported the hypothesis that the red pulp of the spleen in the adult rabbit is a functionally dynamic area constantly changing its histological structure, both regarding cells and state of the vascular channels.
    Zusätzliches Material: 16 Ill.
    Materialart: Digitale Medien
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  • 174
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 121-122 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Materialart: Digitale Medien
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  • 175
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964) 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 176
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The excessive growth of fatty tissue around atrophic organs has been described in humans as “hypertrophy ex vacuo”. Since adipose tissue receives its blood supply from smaller branches of arteries which also supply organs or muscles, it has been suggested that increased amounts of blood could be diverted from the inactive organs to the surrounding fatty tissue and promote its growth. This theory was investigated, using rats and mice of different strains. One testis, the artery of which also supplies the epididymal fat pad, was removed, and the animals sacrificed 3-4 weeks later. Growth of the affected fat pad in both rats and mice of normal body composition was significantly reduced. Removal of the testis in adult yellow-obese mice during periods of weight gain produced a moderate but significant weight increase of the affected fat body.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 177
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 171-176 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A control group of guinea pigs ovulated 3.43 ± 0.41 ova or 1.72 ova per ovary. Unilateral ovariectomy (semispaying) on day 1 resulted in the ovulation of 3.71 ± 0.37 ova from the remaining ovary, whereas after semispaying on days 5 and 10, 2.80 ± 0.12 eggs were ovaluated. Unilateral ovariectomy during days 12, 14 and just prior to ovulation resulted in the same number of ova being ovulated from the remaining ovary as from the initial ovary removed. Semispaying at any day during the cycle did not alter cycle length.At day 1, all follicles from the previous cycle were atretic. At day 5 the current population of follicles were well developed with no atresia present. Ovaries removed on days 5, 10, and 12 had approximately the same distribution of large follicles with atresia appearing in all size ranges. At day 14, the number of large follicles was markedly decreased. However, after semispaying at day 5, the remaining ovary at day 14 had twice the number of Graafian follicles and twice the amount of atresia in these size ranges as the normal day 14 ovary.It is therefore likely that the compensatory response after unilateral ovariectomy in the guinea pig is due to an increase in the rate of proliferation of smaller sized follicles into larger ones. Day 12 seems to be the critical period of the guinea pig cycle. At this time, regression of the corpora lutea occurs, and perhaps of significance, the ability of the animal to compensate for unilateral ovariectomy is also lost.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 178
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 209-217 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: In seven human fetuses of C.R. lengths ranging from 38 mm to 100 mm primary ossification of the ilium has been described.In the 38 mm fetus the perichondrium at the caudal border of the ilium in the vicinity of the greater sciatic notch is intensely basophilic and contains osteoblasts. In another 38 mm fetus in the same area new bone is present.In the 50 mm fetus bone has spread cephalad over the internal and external surfaces of the ala of the ilium without invading the underlying cartilage.In the 58 mm fetus pores are present in the bone and through them osteoblasts and vascular elements are invading the disintegrated cartilage to form the primary marrow cavity.In the 66 mm fetus the primary marrow cavity has spread into the ala of the ilium.The whole process is similar to that seen in the primary ossification of the shaft of a typical long bone and follows the sequence described by Streeter ('49).
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
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  • 179
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 219-229 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The ultimobranchial body was investigated in 63 specimens of Rana pipiens. The morphology is described for “typical” (unifollicular) glands and those found in animals in poor physiological (“stressed”) condition. The typical follicular epithelium is of a mixed pseudostratified type and includes “elongate” cells which extend from the basement membrane to the free surface. These contain elongated nuclei, prominent terminal lipid droplets and “deltoid bodies” which are triangular, homogeneously staining structures apical or basal to the nucleus. “Isometric” cells do not extend to the basement membrane. They posses intensely staining nuclei, few lipid droplets and no deltoid bodies. The stressed gland is multifollicular and degenerate. Mitochondria, lipid droplets, deltoid bodies and glycogen have been identified and are located in specific areas of the follicular cells. The secretory products within the lumina of the glands have tentatively been shown to contain acid mucopolysaccharides, carbohydrate-protein complexes, mucoproteins, lipid droplets and lipid complexes. These secretions may either represent possible precursors to future secretions or a retention of secretions produced during metamorphosis. The ultimobranchial body has shown no indication of degeneration in the adult.The ultimobranchial body in typical Rana is an active secretory gland which shows no indication of degeneration in normal adult anurans. Furthermore, it responds to fluctuations in environmental conditions as illustrated by its altered structure and varied types of secretion when stressed.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
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  • 180
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Colloidal mercuric sulfide injected into the rete testis adhered to the stereocilia of the epithelial cells and subsequently moved into a highly developed canalicular system in the apical cytoplasm. The canalicular invaginations of the cell surface arising between the stereocilia lead to cytoplasmic vacuoles that concentrate the particulate matter. The limiting membrane of the stereocilia and of the canaliculi and vacuoles is covered by a layer of amorphous material. It is speculated that this may bind particles, molecules, and ions as does an ion exchange resin, and that it may, in this way, act as a carrier in the uptake and transport of substances by cells.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
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  • 181
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 507-516 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: In this study the distribution of mast cells in the cephalic, middle, or caudal portions of the uterine horns did not differ. In cross-sections, however, mast cells were most numerous in the myometrium, intermediate in the tunica vasculare of the endometrium and least in the mucosa. In the endometrium, the mast cells were most numerous in the antimesometrial, least in the mesometrial and intermediate in the lateral quadrants. In the myometrium, however, the relative numbers of mast cells between the quadrants varied according to the day in the estrous cycle.On days 1 (the day after estrus), 2, 3, and 4, (the day of proestrus) of the estrous cycle, there were respectively 42.7, 21.8, 22.5 and 10.7 mast cells in the endometrium per 12 μ sections. The differences in means between groups was highly significant (P 〈 0.001). In mated females on 67, 79, 91, 103, 115, and 151 hours after ovulation, there were respectively 9.4, 8.4, 4.7, 5.6, 2.1, and 2.2 mast cells in the endometrium per 12 μ cross-section. The differences in the means were not significant.The mean number of mast cells per 12 μ cross-sections of uteri of ovariectomized females was 20 ± 8. Subcutaneous injections of 0.3 gamma estrogen did not significantly alter the number of mast cells but 0.6 gamma depressed the mean count to 11 ± 7.It appeared from these studies that the uterine mast cell numbers were related to the cyclic phenomena of estrous, but that the numerical relationship to the time of nidation was not clear.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
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  • 182
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 552-552 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Materialart: Digitale Medien
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  • 183
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964), S. 1-11 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Ectopic glomeruli and proximal convoluted tubules were found in the kidneys of the rat, cat, dog, rabbit and ferret and in the human full-term fetus. They lay in the connective tissue around the main intrarenal vessels and deep to the pelvic mucosa. Their afferent arterioles were long and gave branches to the pelvic mucosal plexus, while their efferents supplied the pelvic mucosa and the medulla, or one or the other of these tissues. In the rabbit the ectopic glomeruli often produced small cysts in the pelvic septum. Degenerating ectopic glomeruli were occasionally found and in the dog the majority of them showed this change. In the adult human kidney, aglomerular arteries supplied both the pelvic mucosa and the medulla and it is suggested that such arteries are the result of degeneration of ectopic glomeruli.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 184
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The adrenal cortex of the male guinea pig has been examined with the electron microscope. Many of the cells of the zone glomerulosa possessed bizarreshaped nuclei with frequent cytoplasmic invaginations. The internal structure of the mitochondria was entirely cristaform, the cristae being spaced at reasonably regular intervals. A rough-surfaced endoplasmic reticulum was present in this zone only. The outer fasciculata showed an abundance of lipid in droplet from. The mitochondrial internal structure of this zone was predominantly cristaform, but the cristae were aggregated in clumps instead of being evenly spaced. Smooth-surfaced cytoplasmic vacuoles were frequent. The inner fasciculate and the reticularis were generally similar. They differed from the above zones in that little lipid was present in droplet form and by the presence of a profusion of smooth-surfaced cytoplasmic vacuoles which were interpreted as being homologous with the agranular endoplasmic reticulum. Mitochondria of the inner fasciculata were irregular in shape, while those of the reticularis were larger and more regular. In all zones of the cortex, the vascular channels were lined with an endothelium separated from the parenchymal cell by a space which was frequently seen to contain fibrils as well as fibroblast-like cells.
    Materialart: Digitale Medien
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  • 185
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964) 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 186
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The medullae from the right adrenal glands of hamsters given one or three injections of reserpine were prepared for electron microscopy by fixation in buffered osmic acid while the contralateral left glands were fixed in formol-dichromate for light microscopic determinations of the chromaffin reaction. The adreno-medullary cells of these animals were compared with cells of untreated hamsters in order to determine if catecholamine loss was accompanied by changes in the electron opaque cytoplasmic granules.Ten and 15 hours following one reserpine injection (1 mg/kg) the chromaffin reaction was positive, whereas after 20 hours the reaction was negative, reflecting a catecholamine reduction. The negative chromaffin reaction was accompanied by alterations in granule ultrastructure. The dense central core of the granules was less electron opaque compared with those of control medullary cells. The decreased density likely reflected a catecholamine loss since the opaque appearance of the granules is attributed to the presence of the amines. Following three injections (1 mg/kg daily; three days) the chromaffin reaction was negative and most granules had disappeared from the cytoplasm. The results give evidence that, after limited reserpine injections (1 mg/kg; one injection), catecholamines can be released from the medullary cells without granule disappearance.
    Materialart: Digitale Medien
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  • 187
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964), S. 299-307 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A cyanotic child and a newborn puppy were found to have a complicated cardiac malformation of essentially identical design. There was situs inversus of the cardiac chambers, hypoplasia of the anatomic left heart with transposition of the great vessels, pulmonary atresia, patent ductus arteriosus and drainage of all pulmonary veins into the anatomic right atrium. There was situs inversus totalis with pivotal levocardia in the child and dextrocardia in the puppy.The patient was markedly improved by a systemic-pulmonary arterial anastomosis indicating the feasibility of palliative surgery in spite of the servere cardiac abnormality.The association of visceral heterotaxy with an identical complicated malformation of the heart in the human and canine species appears to indicate a common developmental deviation and thus is considered to be of teratologic significance.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 188
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964), S. 309-312 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: In the normal parathyroid gland of the mouse there is only one type of cell which is small with a large nucleus and small amount of cytoplasm. In order to investigate the effect of relaxin on parathyroid histology, mice were injected with relaxin, the degree of pubic separation was measured by the x-ray technique, and the parathyroid glands were studied histologically. After one day of relaxin injection, the pubic symphysis showed a distinct separation and in part of the parathyroid gland the cells were larger and stained lighter and pinker than the normal cells with hematoxylin, eosin, and azur II. After four days of relaxin treatment, the whole gland had changed so that all the cells were of the second type. Glands of pregnant mice near term also were composed of cells of this type. These results indicate a relationship between relaxin and the parathyroid gland.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
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  • 189
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A study of 40 racing Greyhounds and 60 mongrel dogs provided comparative data on the respective components of the canine electrocardiogram. Additional data revealed that the Greyhound had a heart weight  -  body weight ratio of 1.25 gm, a heart rate of 115 beats per minute, a systolic blood pressure of 254 mm of Hg, and a diastolic pressure of 139 mm of Hg. These findings in an athletic animal are compared with similar observations in untrained animals. The significance of this basic information is presented and discussed.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
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  • 190
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964), S. 181-189 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Although melanoctyes appear to be limited to the hair folicles of adult belly skin of the PET mouse, they are found throughout the integument of the newborn. Trauma applied to the ventral belly skin of newborn PET mice results in the maintenance and augmentation of the melanocytes within the skin, even after the formation and growth of hair. The area immediately surrounding the site of trauma shows an increase in the number of melanocytes, apparently due in part to the disruption of the developing follicles and the consequent release of their pigment cells to the skin. UV irradiation also maintains a system of melanocytes within the ventral belly skin of PET mice.The significance of the maintenance and augmentation of melanocytes from the newborn into the adult by surgical trauma or UV radiation is discussed.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 191
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964), S. 225-235 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The histology of the anterior hypophysis, thyroid and gonads of dwarf (dw) and Ames dwarf (df) mutants of Mus musculus was compared. Orange G, aldehyde fuchsin and PAS stains were used to differentiate cells of the hypophysis. In both types of dwarf the anterior hypophysis was small, acidophils were lacking and the number of thyrotropic hormone producing cells was reduced. The thyroids were reduced in size, the follicles were small and some tissue was not organized into follicles. Testes were nearly normal. Ovaries were small and large follicles and corpora lutea were lacking.Growth hormone (STH) and thyrotropic hormone (TSH) were administered to both types of dwarfs. The treatment had no effect on the anterior hypophysis but number and size of follicles in the thyroid was increased The response was greater in df dwarfs; STH and TSH had more effect than STH alone. Testes of treated mice were only slightly changed but most of the df and some dw males became fertile. The ovaries became large and functional. Thyroids of dwarfs treated with thyroxine were not changed.It is concluded that the primary hormone deficiencies in both types of dwarf are the same, but that there are physiological differences as revealed by responses to STH and TSH treatment.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
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  • 192
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: This study was undertaken to determine the relationship between Marshall's metalophilic reticular cells and the cells exhibiting non-specific esterase and acid phosphatase activity in the rat spleen. Untreated and stimulated animals were used. Observations were made chiefly on the marginal metalophils of Snook. These cells showed strong acid phosphatase activity but only slight non-specific esterase activity in untreated animals. Following stimulation non-specific esterase activity increased in these cells. Within the nodules metalophilic reticular cells were always more numerous than cells with enzyme activity. Many of these metalophilic cells developed enzyme activity following stimulation. By the use of a restaining technique it was shown that all reticular cells possessing enzyme activity were also metalophilic but that the converse was not true. No mitotic activity was present in these cells.The results suggest that Marshall's metalophils are cells of the reticuloendothelial system in various stages of maturation and that, following stimulation, they may differentiate into mature phagocytic cells.
    Materialart: Digitale Medien
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  • 193
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964) 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Materialart: Digitale Medien
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  • 194
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Densities of the various bone fractions i.e., water, organic, volatile inorganic and ash fractions, as well as fat in the various animals have been studied. However. values reported by various workers failed to show consistency and uniformity, especially with respect to the volatile inorganic (often called “CO2 fraction”) and the ash fractions. These densities are prerequisite to the study of the volumetric composition of bone and bone marrow.In our study, the fat and organic densities found were similar to those previously reported. The volatile and non-volatile inorganic (ash) fractions, had density values of 1.684 and 3.180, respectively. The ash density was much higher than values previously reported but it verifies a theoretical value deduced by the authors from published work.Our higher ash density was due to a smaller measured volume of this fraction obtained by applying a negative pressure to remove the small entrapped air bubbles from the ash sample prior to the water displacement measurement. Because a smaller portion of the total inorganic volume was used for the ash calculation, giving it a higher density, a larger balance of the total inorganic volume was left for the volatile inorganic density calculation. This accounted for ash and volatile inorganic densities which were higher and lower, respectively, than such values previously reported.Prior to the determination of the density of the non-volatile inorganic fraction, the ashing time and temperature were studied. Curves plotted from the results of such studies were described and explained.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 195
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964), S. 397-404 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A 79 year-old European female cadaver presented the usual features of second stage arrested mid-gut rotation accompanied by unusual mesenteric attachments and pancreatico-duodenal relationships.The mesentery, whose root extended from the lower pole of the right kidney diagonally across the posterior abdominal wall to end just medial to the left sacroiliac joint, enclosed most of the small bowel and the proximal large bowel. The unusually short duodenum began 2.5 cm to the left of the mid-line and described a 13 cm U loop with an upward concavity in which rested the pancreas; this loop and the related pancreas were enclosed in a persistent, transversely placed mesoduodenum. The common bile duct crossed the anterior surface of the pancreas to open at the greater duodenal papilla 2.5 cm from the pylorus. the main pancreatic duct lay much closer to the anterior than to the posterior aspect of the gland. The lesser duodenal papilla was situated on the posterior wall of the duodenum. The hepatic artery arose in common with the superior mesenteric artery and encircled the pancreas. The pancreatico-duodenal vessels were predominantly distributed upon the posterior aspect of the pancreas and duodenum.It appears that in this specimen the anterior and posterior aspects of the duodenum are transposed, the reversal of surfaces also involving the pancreas. Causative factors are discussed with reference to the literature.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
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  • 196
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964), S. 333-357 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Comparison of results obtained by S35O4= autoradiography with those from histochemical staining methods and evaluation of the effect on the staining resulting from prior sialidase digestion, methylation, methylation and saponification, or sulfation, substantiates the selectivity of some procedures for sialomucin and others for sulfomucin. These two types of mucopolysaccharide may be differentiated by the high iron diamine-alcian blue or aldehyde fuchsin-alcian blue sequences or comparison between staining with the alcian blue pH 2.5-PAS sequence and staining with the alcian blue pH 1.0-PAS method. These techniques reveal that some rodent or lagomorph salivary glands form sialomucin alone, others apparently only sulfomucin, whereas a number produce both types of acid mucopolysaccharide either in different mucous cells throughout the gland or in the same cell.Differences in affinity for basic dyes, periodate reactivity, and susceptibility to elimination of basophilia by methylation or enzymatic digestion are evident among both the sulfo- and the sialomucins in different glands. After brief saponification the sialomucin in rat sublingual glands becomes sialidase digestible and gains alcohol resistant metachromasia.Several serous or seromucous glands secrete neutral mucopolysaccharides; others secrete polysaccharides containing sulfate or sialic acid groups whose affinity is masked for some but not for other basic dyes.
    Zusätzliches Material: 3 Tab.
    Materialart: Digitale Medien
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  • 197
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Proliferative activity of the adrenal cortex was studied following injections of thymidine-H3. Normal male Long-Evans rats had less activity than comparable animals of the Sprague-Dawley strain. Of the Long-Evans rats killed at different hours of the day, those injected with thymidine-H3 at 6 P.M. and killed six hours later had the greatest activity. Normal male rats 35 to 73 days of age had almost all activity in the glomerulosa and outer fasciculata of the cortex. This activity was greatly increased two or three days after injecting colchicine, compound 48/80, or carbon tetrachloride. Such stressing agents did not cause any increase in activity during the first 24 hours. Three days after carbon tetrachloride a considerable increase in proliferative activity occurred in the inner zona fasciculata and reticularis of the adrenal of female rats during diestrus. Male rats killed 28 to 40 days after injecting thymidine-H3 showed no evidence of centripetal migration of cells into the reticularis during that time. The absence of centripetal migration and the marked responsiveness of the inner fasciculata and reticularis of female animals after stressing agents supports the zonal theory of function in the adrenal cortex.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 198
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: A simple method for separating the ectodermal (chorionic) and entodermal (allantoic) layers of the chorio-allantoic membrane has been devised. It consists of placing, unfolded, a membrane fragment on a rubber balloon filled with water; air is blown briskly upon the membrane by means of a rubber bulb until its shiny surface becomes dull; following this, a glass slide is applied on it, surface to surface, and then it is suddenly taken off, whereby the desired epithelial layer becomes attached to the glass surface. The microscopic observation of the layers thus individualized shows, on frontal view, their histological architecture, and the characteristic structural details of the constituent cells (cytoplasm, nucleus, nucleolus, cytoplasmic inclusions, mitochondria, stages in mitotic cell division, etc.).
    Materialart: Digitale Medien
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  • 199
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 149 (1964), S. 449-451 
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: Measurements of the lengths of the shafts of the third, fourth and fifth metatarsals have been made on serial standarized radiographs of white Australian children. A statistical analysis showed that, in the boys, there were no real differences between the rates of elongation of the shafts during periods when the corresponding epiphyses became radio-opaque and those that occurred during earlier or later periods. There was a statistically significant tendency in the girls for rate of elongation of metatarsals to be more rapid before radio-opaque changes in epiphyses were noted than after.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 200
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: One hundred twenty-two of 225 accurately located and measured mammary segments were transplanted successfully into the isologous female mice, and intact or castrated male host mice treated with estrogen and progesterone pellets. Five of 42 segments that had ligatures placed to determine the orientation of the segment were also recovered. Fewer grafts were recovered from intact male hosts than from castrated male or intact female hosts. The lengths of transplants ranged from less than 0.2 mm to 3.0 mm. Transplants that were 0.6 mm long grew most frequently. Transplants obtained from different portions of any one mammary gland or from any mammary glands were recovered at comparable rates. The fourth mammary gland-free fat pads, the pararenal fat pads, the mesometrial fat layers and subcutaneous areas were used as transplantation sites. The ultimate size of the regenerated transplants was determined by the amount of adipose tissue in the transplantation site and the hormonal environment, but not by the original size of the transplant. Mammary transplants obtained from all portions of ducts, even from quiescent glands of a 734-day-old mouse, or grafts which had been ligated with silk or hair, showed equal capability of regeneration. All successful transplants responded to either endogenous or exogenous hormones in a manner comparable to the hosts' own mammary glands, and lactated at parturition.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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