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  • Electronic Resource  (2)
  • 1990-1994
  • 1970-1974  (2)
  • 1972  (2)
  • Cardioactive glycosides  (1)
  • Embryonic Growth  (1)
Material
  • Electronic Resource  (2)
Years
  • 1990-1994
  • 1970-1974  (2)
Year
  • 1972  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 272 (1972), S. 169-181 
    ISSN: 1432-1912
    Keywords: Embryonic Growth ; DNA ; RNA ; Nuclei
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: 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.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Research in experimental medicine 159 (1972), S. 65-74 
    ISSN: 1433-8580
    Keywords: Cardioactive glycosides ; Respiratory acidosis ; Alcalosis ; β-sympatholytic drugs ; Herzwirksame Glykoside ; Respiratorische Acidose ; Alkalose ; β-Sympathicolytica
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: 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.
    Notes: 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.
    Type of Medium: Electronic Resource
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