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  • Life and Medical Sciences  (13)
  • Magnesium  (2)
  • activity coefficient  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of solution chemistry 7 (1978), S. 327-337 
    ISSN: 1572-8927
    Keywords: Enthalpy ; heat of dilution ; heat of solution ; activity coefficient ; electrolyte ; thermodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Heat of dilution and of solution data are fitted to the form of equation corresponding to that used successfully for activity and osmotic coefficients over a wide range of concentrations. The resulting parameters give the change with temperature of the activity and osmotic coefficients. Results are reported for 84 electrolytes of 1-1, 2-1, 3-1, and 2-2 valence types.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of solution chemistry 7 (1978), S. 45-56 
    ISSN: 1572-8927
    Keywords: Rare earth salts ; lanthanides ; osmotic coefficient ; activity coefficient ; heat of dilution ; apparent molal volume ; density
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The extensive data for the osmotic coefficients, heats of dilution, and densities of aqueous solutions of rare earth chlorides, nitrates, and perchlorates are fitted to a single type of equation found satisfactory for many other solutes Good agreement is obtained. The various parameters do not show simple trends with cation radius. While there are some plausible explanations of these complexities, the total picture is far from clear.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 9 (1972), S. 17-27 
    ISSN: 1432-0827
    Keywords: Periosteal Hyperplasia ; Osteomyelosclerosis ; Magnesium ; Parathyroid ; Rats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Un régime contenant 0.8 à 2 mg de Mg pour 100 g, administré à des rats jeunes ou adultes pendant 18 à 21 jours, provoque une croissance généralisée d'os médullaire (ostéomyélosclérose), ainsi que des tumeurs périostées de type desmoide, au niveau de la linea aspera du fémur. Ces modifications s'accompagnent d'une décroissance du magnésium osseux de 52 à 71%, déterminée par spectrophotométrie d'absorption atomique. Au niveau des tumeurs périostées, la parathyroidectomie favorise la formation de cartilage. L'administration d'extrait parathyroidien inhibe la formation de cartilage en faveur de la formation de tissue fibreux et d'os. L'adjonction de magnésium au régime restitue rapidement l'apparence normale des tissus.
    Abstract: Zusammenfassung Eine Nahrung mit 0,8–2 mg Mg per 100 g wurde jungen oder ausgewachsenen Ratten während 18–21 Tagen verfüttert; sie verursachte ein generalisiertes medulläres Knochenwachstum (Osteomyelosklerose) und ebenso desmoidartige Tumoren, des Periosts an der femoralen Linea aspera. Diese Veränderungen waren von einer Abnahme von 52–71% der Magnesium-Konzentration im Knochen begleitet (Bestimmung am Atomabsorptions-Spektrophotometer). Bei Tumoren des Periosts wurde die Knorpelbildung durch Parathyreoidektomie begünstigt. Durch Verabreichung von Parathyreoidea-Extrakt wurde die Knorpelbildung gehemmt und an deren Stell fibröses Gewebe und Knochen gebildet. Wurde der Nahrung Magnesium zugesetzt, so bekamen die Gewebe rasch ein normales Aussehen.
    Notes: Abstract A diet containing from 0.8 to 2 mg Mg/100 g, fed to young or adult rats for 18 to 21 days produced generalized medullary bone growth (osteomyelosclerosis) and also periosteal tumours of the desmoid type, at the femoral linea aspera. These changes were accompanied by decreases in bone magnesium concentration of 52 to 71% as measured by atomic absorption spectrophotometry. In the periosteal tumours, parathyroidectomy favoured cartilage formation. The administration of parathyroid extract inhibited cartilage formation in favour of fibrous tissue and bone production. The addition of magnesium to the diet quickly restored the normal appearance of the tissues.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 10 (1972), S. 269-279 
    ISSN: 1432-0827
    Keywords: Calcification ; ATP ; Magnesium ; Plaque ; Amorphous
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé L'injection sous-cutanée de solutions de Ca ATP provoque, chez le Rat, la formation de plaques rugueses et circonscrites, de couleur blanche, contenant du phosphate de calcium amorphe (Ca/P 1.3, 1.5). Des dépôts denses, en forme de bâtonnets, orientés le long des éléments fibreux, entourent les vaisseaux sanguins et sont situés dans le tissu conjonctif souscutané. La réaction observée est proportionnelle à la dose utilisée, la quantité de calcium de la plaque étant environ 100 fois celle de la quantité injectée. Ces résultats semblent indiquer que le phosphate de calcium, formé à partir du Ca ATP, dans le tissu sous-cutané actif en ATP-ase, est susceptible de provoquer un phénomène de cristallisation par nucléation. L'injection d'une solution de Ca Cl2, ayant la même concentration en calcium que la solution Ca ATP ou d'une solution de phosphate de sodium, ayant la même concentration en phosphore que Ca ATP, ne provoque pas de plaques. Cependant, l'injection d'une solution contenant du Ca2+ et du PO 4 3− forme de la plaque, en quantité inférieure à celle provoquée par l'injection de Ca ATP. A l'aide d'une dose d'injection type, contenant des concentrations accrues de magnesium, on observe la formation de plaques dont la taille et le poids en cendres sont inversement proportionnels au rapport Mg/Ca de la solution injectée. Dans ce système, il semble que le rapport Mg/Ca puisse affecter le processus de calcification et qu'il puisse aussi inhiber la calcification de tissus mous, en controlant les rapports locaux Mg/Ca.
    Abstract: Zusammenfassung Die subkutane Injection von CaATP-Lösungen in Ratten führte zur Bildung von weißen, umschriebenen, sandigen Plättchen, welche amorphes Calciumphosphat enthielten (Ca/P 1,3; 1,5). Dichte, rutenförmige Ablagerungen fanden sich entlang den fibrösen Elementen und umgaben Blutgefäße im subkutanen Bindegewebe. Diese Reaktion hing von der Dosis ab; die Menge des Calciums in den Plättchen entsprach etwa der hundertfachen eingespritzten Menge. Diese Ergebnisse lassen vermuten, daß das Calciumphosphat, welches im ATPase-aktiven subcutanen Gewebe aus CaATP gebildet wurde, als Keim für die Kristallisation wirken kann. Die Injektion einer Lösung von CaCl2, welche dieselbe Konzentration hatte wie das Calcium in der CaATP-Lösung, oder einer Natriumphosphatlösung, welche dieselbe Phosphorkonzentration wie CaATP hatte, erzeugte keine Plättchen. Hingegen erzeugte die Injektion einer Lösung, welche Ca2+ und PO 4 3− enthielt, Plättchen, die jedoch kleiner waren als diejenigen nach der Injektion von CaATP. Bei Verwendung einer Standard-Injektionsdosis, welche zunehmende Mengen von Magnesium enthielt, wurden Plättchen gebildet, deren Größe und Aschgewicht umgekehrt proportional zum Mg/Ca-Verhältnis in der eingespritzten Lösung waren. Die Ergebnisse bei diesem System lassen vermuten, daß das lokale Mg/Ca-Verhältnis den Kalzifikationsprozeß beein-flussen kann. Aus diesen Befunden folgt, daß es möglich sein könnte, die Weichteilverkalkung durch die Kontrolle der lokalen Mg/Ca-Verhältnisse zu hemmen.
    Notes: Abstract Injection of CaATP solutions subcutaneously in rats resulted in the formation of white, circumscribed, gritty plaques containing amorphous calcium phosphate (Ca/P 1.3–1.5). Dense, rod-shaped deposits were oriented along the fibrous elements and surrounding blood vessels in the subcutaneous connective tissue. The response was dose related, the amount of plaque calcium being about 100 times the amount injected. These results suggest that the calcium phosphate formed from CaATP in the ATPase active subcutaneous tissue may nucleate crystallization. Injection of a solution of CaCl2 having the same concentration as the calcium in the CaATP solution, or of a sodium phosphate solution having the same concentration of phosphorus as the CaATP, did not produce plaques. However, injection of a solution containing both Ca2+ and PO 4 3− produced plaques, although smaller than those formed by injection of CaATP. Using as standard CaATP injection dose containing increasing amounts of magnesium, plaques were formed whose size and ashed weight were inversely proportional to the Mg/Ca ratio in the solution injected. In this system, the results suggest that the local ratio of Mg/Ca may affect the calcification process. A corollary to this conclusion is that it may be possible to inhibit soft tissue calcification through control of the local Mg/Ca ratios.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 148 (1964), S. 573-579 
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Fixation of the thyroid gland with formaldehyde-ethanol-acetic acid retains a larger proportion of colloid constituents than aqueous formaldehyde.Comparative histochemistry has revealed a larger proportion of protein, arginine, cabohydrates and iodinated material.The heterogeneous staining pattern was not observed after aqueous formaldehyde fixation.The intracellular globules and the early iodinated fraction of the colloid were similarly stained.Intracellular globules were not observed in aqueous formaldehyde-fixed tissues.Only the more slowly labeled fraction of the colloid (large follicles), was stained by toluidine blue and also by bromphenol blue without mercury, indicative of basic proteins.
    Additional Material: 8 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 158 (1967), S. 443-451 
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Male Holtzman rats were fed large doses of vitamin A, D or A and D for 43 days. Sections of the tibia demineralized in EDTA were submitted to alpharadiography or stained by a variety of procedures, including mucopolysaccharide histochemistry. The results were as follows: (1)In hypervitaminosis D, slightly increased periosteal apposition of normal bone; greatly increased maturation of osteocytes with lacunar enlargement and confluence, interstitial metachromasia and loss of density (osteocytic osteolysis).(2)In hypervitaminosis A, large growth of abnormally stained cancellous bone at periosteum and stimulation of osteolysis in new and old bone.(3)In combined A and D hypervitaminoses, the peripheral apposition rate exceeded that induced by vitamin A or vitamin D alone. The new bone appeared fragile and this combined with increased osteolysis was responsible for a number of spontaneous fractures.
    Additional Material: 1 Tab.
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 124 (1956), S. 555-579 
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 139 (1961), S. 539-545 
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Dividing cells have been labeled in three week old chicks with H3-thymidine and observed through radioautography at different time intervals and also under varied nutritional and hormonal conditions.After two hours mostly primitive cells were labeled (Mesenchymal cells, fibroblasts, chondroblasts, hemopoietic precursors).Labeled osteoclasts and osteoblasts were abundant after one and two days and their number decreased thereafter.Labeled osteocytes were present at two and four days but rarely thereafter. Osteocyte maturation was delayed in rickets.The osteoclasts showed a larger proportion of labeled nuclei in the Vitamin D treated birds as compared to the rachitic group. Otherwise the rate of appearance and disappearance of labeled nuclei in osteoclasts was constant in the three groups of chicks.Osteoclasts during their life span, renew their nuclei by annexation of young ones as older nuclei degenerate.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 167 (1970), S. 439-463 
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: In cementum of rat molars, the cementoblasts were found to differ from pre-cementoblasts in having an increased granular endoplasmic reticulum, greater number of polyribosomes and denser material in the cisternae of granular E. R. as well as in the general cytoplasm. The cementocytes with maturation showed a gradual decrease in the size of the Golgi complex and the granular endoplasmic reticulum. On the other hand, an increase in the number of lysosomes was observed. Parallel with these intracellular changes, the pericullular space became irregular in width, its fibrillar material became replaced by a flocculent material. Ocasionally, structurally different matrix was seen. At the cemento-dentinal junction the cementocytes showed degenerative changes indicative of degeneration and death. The epithelial cells, remnants of Hertwig's root-sheath, some of which get enclosed in the cementum, accumulated filamentous material as well as spheres of amorphous substance. These cells eventually degenerated, leaving their debris in the lacunae. The degeneration of epithelial cells did not seem to affect the cementum matrix in their immediate vicinity. Some collagen fibrils of the cementum, seemed to differ structurally from those of the periodontal membrane. Thin fibrils, about 160 Å in diameter, were also observed in the cementum.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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