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  • 1985-1989  (3)
  • 1970-1974  (12)
  • 1950-1954  (6)
  • 1890-1899  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 57 (1989), S. 0 
    ISSN: 1574-6968
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Abstract Cells of Bacillus subtilis 168+ were labeled with 32P-orthophosphate during the process of sporulation, germination and outgrowth. By two-dimensional gel electrophoresis, at least 30 protein species were found to be radioactively labeled; 30% of these were modified by phosphorylation. Significant changes in the protein phosphorylation pattern during growth and cellular differentiation could be demonstrated. Using γ-32P-ATP evidence for an ATP-dependent protein kinase was also obtained. Under these conditions 4 proteins with a molecular mass of 109 600; 103 100; 73 300 and 32 200 Da were found to be phosphorylated.
    Materialart: Digitale Medien
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 272 (1972), S. 169-181 
    ISSN: 1432-1912
    Schlagwort(e): Embryonic Growth ; DNA ; RNA ; Nuclei
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary In order to get insight into the synthesis rates occuring in mammalian embryos during the phase of differentiation, wet and dry weight as well as DNA-, RNA-, and nitrogen content of the whole implantation site (day 7 to 10 of gestation) and of the embryos (day 11 to 14) have been determined. Growth of the whole implantation site (day 7 to 10) proceeds almost linearly: Within a 24-h period the weight increases about 2-fold. The growth of the embryos, however, is found to be different in each 24-h period between day 8 and 14. All synthesis processes proceed at an extremely rapid rate between day 9 and 12 of gestation. The weight of embryos shows a 6-fold rise between day 11 and 12, the increase being even more pronounced on the preceding days. Growth and increase in cell mass are essentially due to cell division, since DNA content and weight change in a parallel way. Data on the nitrogen content per embryo show that the protein synthesis keeps pace with the rapid cell division. Using pure nuclear fractions isolated from 11- to 14-day-old embryos the average distribution of RNA within the cells can be estimated. The increase in the number of cells within a 24-h period is calculated from the average DNA content per embryo and the average DNA content per nucleus measured in isolated nuclei. The DNA content per nucleus of 12- to 14-day-old rat embryos is found to be almost twice (12±0.5 pg) that of diploid nuclei (6.7–7.2 pg). This inducates that a high percentage of the cells are in the late S-phase or in the G2-phase. The growth rate of the embryos between day 8 and 14 of gestation is calculated from the 24-h rate of increase in cell number which is obtained either biochemically or in the earlier stage of embryonic development with morphological studies. Some peculiarities of the duration of the cell cycle of the rapidly growing tissue are discussed.
    Materialart: Digitale Medien
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 277 (1973), S. 71-88 
    ISSN: 1432-1912
    Schlagwort(e): Cyclophosphamide ; Embryonic Development ; DNA-Dependent RNA Polymerases
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary On day 13+0 h of gestation rats received 10 mg/kg cyclophosphamide i.p. 3, 9, and 24 h after administration of the drug the activities of the DNA-dependent RNA polymerase reactions were measured in the whole embryo and in parts of it (head, upper and lower extremities and trunk). The activities of these enzymes were correlated with the increase in the RNA content of these tissues. A relationship was established light and electron microscopically between the biochemical results and the specific alterations which occur in different structures of the embryonic tissue. The results of these investigations show that: 1. cyclophosphamide leads-in dependency on the time-to a decrease or increase in the Mn++- and/or Mg++-stimulated RNA polymerase reactions in isolated cell nuclei of individual parts of the embryo 2. alterations in the enzyme activities of individual parts of the embryo are not detected when the enzyme activity of the whole embryo is measured at the early day 13 of gestation 3. towards the end of gestation malformations can be demonstrated only in those parts of the embryo, where 24 h after the administration of cyclophosphamide the enzyme pattern shows a highly significant deviation from that of the controls and where cell necroses can be demonstrated light and electron microscopically. Moreover, in the nucleolus of the neuroepithelium segregation of its components takes place which correlates well with the decreased r-RNA polymerase activity. In this paper a disturbance of the transcription mechanisms is discussed as being the primary mode of action of cyclophosphamide in cell metabolism.
    Materialart: Digitale Medien
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Research in experimental medicine 158 (1972), S. 308-320 
    ISSN: 1433-8580
    Schlagwort(e): Respiratory Acidosis ; Cardiovascular Effects ; Sympathomimetic Amines ; Species Differences ; Respiratorische Acidose ; Kreislauf ; Sympathomimetica ; Speciesunterschiede
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung An Katzen, Hunden, Kaninchen und Hausschweinen wurden in Pentobarbitalnarkose nach Muskelrelaxation mit Alloferin® bei geschlossenem Thorax die Auswirkungen einer akuten respiratorischen Acidose auf den Kreislauf sowie dessen Reaktion auf Pharmaka untersucht. 1. BeiKatzen undSchweinen steigen in respiratorischer Acidose Herzfrequenz, dp/dtmax und Blutdruck an; beiKaninchen bleiben dp/dtmax und Blutdruck nahezu unverändert. BeiHunden hingegen sinken Schlagfrequenz, dp/dtmax und Blutdruck in Acidose ab. Untersuchungen an Katzen, die mit Reserpin vorbehandelt waren, zeigten, daß eine respiratorische Acidose einen negativ inotropen und blutdrucksenkenden Eigeneffekt besitzt. Nach Vorbehandlung mit Phenoxybenzamin verursacht eine respiratorische Acidose bei Katzen einen Blutdruckabfall sowie einen Anstieg von dp/dtmax. Nach Vorbehandlung mit Pindolol verursacht eine Acidose eine Abnahme von Frequenz und dp/dtmax, während der Blutdruck konstant bleibt. Am unvorbehandelten Tier wird der negativ inotrope Effekt einer Acidose offenbar durch eine Stimulierung des sympathischen Nervensystems überdeckt, die bei Katzen und Schweinen am ausgeprägtesten ist. 2. DieWirkung sympathomimetischer Amine auf Herz und Kreislauf ist bei allen 4 untersuchten Tierarten in Acidose abgeschwächt, wobei die Abschwächung bei den Tieren mit der stärksten sympathischen Stimulation am ausgeprägtesten ist. 3. Biochemische Untersuchungen an Hunden und Katzen ergaben, daß in Acidose K+, Mg2+, anorganisches Phosphat und Glucose im Serum ansteigen, während der Magnesiumgehalt des Herzmuskels abnimmt.
    Notizen: Summary In closed chest cats, dogs, rabbits and pigs, anaesthetized with pentobarbital and relaxed with diallylnortoxiferinium dichloride the effects of a respiratory acidosis on heart and circulation as well as their reaction to sympathomimetic amines were studied. 1. Incats andpigs a respiratory acidosis causes a rise of frequency, dp/dtmax of the left ventricle and systolic blood-pressure. Inrabbits an acidosis causes no significant alteration of blood-pressure and dp/dtmax. Indogs frequency, dp/dtmax and blood-pressure decline in acidosis. In cats pretreated withreserpine a respiratory acidosis causes a negative inotropic effect and a declining of blood-pressure. After pretreating cats withphenoxybenzamine in acidosis there results a decrease of blood-pressure, but a rise of dp/dtmax and frequency; after pretreating withpindolol in acidosis dp/dtmax and frequency decline, but blood-pressure remains unaltered. 2. The effectiveness of sympathomimetic amines on heart and circulation is diminished in acidosis. This diminution is most significant in those animals (cat, pig) with the most augmented sympathetic tonus in acidosis, but experiments performed with reserpinized cats indicated that the augmented sympathetic tonus can not be the only cause for the diminished efficiency of adrenergic stimulant amines in acidosis. 3. Biochemical studies performed in acidosis showed a rise of K+, Mg2+, inorganic phosphate and glucose in serum and a decrease of Mg2+ in the heart muscle.
    Materialart: Digitale Medien
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    Research in experimental medicine 159 (1972), S. 65-74 
    ISSN: 1433-8580
    Schlagwort(e): Cardioactive glycosides ; Respiratory acidosis ; Alcalosis ; β-sympatholytic drugs ; Herzwirksame Glykoside ; Respiratorische Acidose ; Alkalose ; β-Sympathicolytica
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung An narkotisierten Katzen wurde der Einfluß des Blut-pH auf die Toxicität herzwirksamer Glykoside untersucht. An isolierten Vorhofpräparaten wurden in Ergänzung hierzu Versuche mit Änderung des pH der Tyrodelösung durchgeführt. 1. An Katzen wird durch eine respiratorische Acidose (pH 7,0) die Toxicität des Digitoxins, Digoxins und k-Strophanthins signifikant erhöht; dabei ist die Toxicität des Digitoxins stärker erhöht als die des Digoxins und k-Strophanthins. 2. Vorbehandlung mit Reserpin oder Practolol vermindert die Toxicität des Digitoxins in Acidose wesentlich stärker als bei normalem pH. 3. Eine durch Tris-Infusion erzeugte Alkalose von pH 7,6 bewirkt keine Änderung, eine durch Infusion von NaHCO3 erzeugte Alkalose von pH 7,6 verursacht eine geringfügige Steigerung der Digitoxintoxicität. 4. Am isolierten Vorhofpräparat des Meerschweinchens ist die Toxicität des Digitoxins, Digoxins und k-Strophanthins bei pH-Werten der Tyrodelösung von 7,0 und 7,8 nicht signifikant verschieden.
    Notizen: Summary In anaesthetized cats the influence of blood-pH on the toxicity of cardiac glycosides was studied. In isolated guinea pigs atrias further experiments were performed by changing the pH of the tyrode solution. 1. In cats with respiratory acidosis (pH 7.0) the toxicity of digitoxin, digoxin and k-strophanthin is enhanced — thereby the toxicity of digitoxin is more enhanced than that of digoxin and k-strophanthin. 2. Pretreatment with reserpine or practolol diminishes the toxicity of digitoxin in acidosis more than at normal blood-pH. 3. An alcalosis of pH 7.6, produced by the infusion of tris causes no change, an alcalosis of pH 7.6 produced by the infusion of NaHCO3 causes a small increase of the toxicity of digitoxin. 4. In the isolated guinea pigs atria the toxicity of digitoxin, digoxin and kstrophanthin is not different at pH 7.0 and 7.8 of the tyrode solution.
    Materialart: Digitale Medien
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  • 6
    facet.materialart.
    Unbekannt
    Groningen, Netherlands : Periodicals Archive Online (PAO)
    Neophilologus. 37:4 (1953:oct. 1) 202 
    ISSN: 0028-2677
    Thema: Allgemeine und vergleichende Sprach- und Literaturwissenschaft. Indogermanistik. Außereuropäische Sprachen und Literaturen
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 274 (1972), S. 385-393 
    ISSN: 1432-1912
    Schlagwort(e): Liver Development ; Thymidine Kinase ; DNA Polymerase ; RNA Polymerases
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The increase in DNA, RNA, and nitrogen as well as the activity of some enzymes involved in nucleic acid metabolism were measured during liver development. During the perinatal period (day 18 of gestation until birth) high activities of thymidine kinase and DNA polymerase were found which decline in the early suckling period, whereas the activities of the DNA-dependent RNA polymerases show a slow continuous increase. During the juvenile period (starting about 4 weeks after birth) the values of all enzymes studied approximate to those measured in liver tissue of adult animals. The correlation of these enzymes with the growth kinetics of liver tissue is discussed.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 8
    ISSN: 1432-1041
    Schlagwort(e): somatostatin analogue ; oral formulation ; gastrointestinal absorption ; SMS 201-995 ; healthy volunteers
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary To determine the local gastrointestinal absorption of a new synthetic somatostatin analogue (SMS 201-995 = Sandostatin), an intestinal tube was passed in eight healthy volunteers and on different days an aqueous solution was administered at four different locations: stomach, proximal duodenum, ligament of Treitz and jejunum. In a follow-up study, an oro-ileal tube was passed in six of the original volunteers and the drug solution was administered in to the terminal ileum. The aqueous solution of SMS was rapidly absorbed from the gastrointestinal tract after local application, and it was well tolerated. Absorption of the drug from the different sites was comparable, although there was a tendency to decreased peptide absorption after ileal administration. Absorption of the drug was quite variable between the subjects and the different locations. The dose-corrected systemic availability relative to subcutaneous administration in another study was 0.28%. However, significant plasma SMS concentrations were achieved, suggesting that oral delivery of the polypeptide may eventually be possible for long-term treatment of a variety of disorders.
    Materialart: Digitale Medien
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  • 9
    Digitale Medien
    Digitale Medien
    Springer
    Theoretical and applied genetics 23 (1953), S. 72-86 
    ISSN: 1432-2242
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Springer
    Theoretical and applied genetics 23 (1953), S. 173-176 
    ISSN: 1432-2242
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Zusammenfassung Aus einer großen Zahl von F1-Bastarden der KreuzungSolanum demissum mit der Kultursorte Aquila wurde in mehrjähriger Prüfung ein mit A 6 bezeichneter Stamm als geeignete Testpflanze zum Nachweis von Mosaikviren der Kartoffel ermittelt. Es werden die Versuchsbedingungen mitgeteilt, die bei der Anwendung des Testes eingehalten werden müssen. Die Anwendbarkeit erstreckt sich auf die verschiedenen Typen und Stämme der Kartoffelviren A, X, Y, sowie auf das Rattle-Virus (Stengelbont), das Bukett-ring-spot-Virus und das Aucuba (F/G)-Virus. Außerdem ergab sich, daß der genannte Bastard auf die verschiedenen Stämme des Tabakmosaik-virus mit ganz eigentümlichen, offenbar spezifischen Symptomen reagiert.
    Materialart: Digitale Medien
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