Über das Fehlen einer Beziehung zwischen dem Kaffeegenuß der Eltern und dem Geschlechtsverhältnis unter ihren Kindern

Ohne ZusammenfassungTeile dieser Arbeit wurden von Fräulein M. Kurth im Rahmen ihrer medizinischen Doktordissertation erarbeitet.Die Untersuchungen der Verfasser zum Mutationsproblem werden durch die Deutsche Forschungsgemeinschaft gefördert.     

Die Wirkungsweise von Cercosporella herpotricboides Fron, dem Erreger der Halmbruchkrankheit des Getreides

In halt: 1. Einleitung und Aufgabenstellung.—2. Art und Ausmaß der Scnäden im Feld-versuch.—3. Wirkungen des Krankheitserregers auf Sommergetreide.—4. Bekämpfungsmöglichkeiten.—5. Besprechung der Ergebnisse.—Zusammenfassung.—Summary. —Literaturverzeichnis.     

Enzymhistochemische Untersuchungen an der Harderschen Drüse des Kaninchens

Zusammenfassung In der Harderschen Drüse von Kaninchen wurden mit der Tetrazoliumtechnik die Enzyme NADH-Tetrazoliumreduktase (NADH-T-Red), NADPH-Tetrazoliumreduktase (NADPH-T-Red), NAD-spezifische Isocitrat-Dehydrogenase (NAD-IDH), Succinat-Dehydrogenase (SDH), NAD-spezifische Malat-Dehydrogenase (NAD-MDH), Laktat-Dehydrogenase (LDH), Glucose-6-phosphat-Dehydrogenase (G-6-PDH),-Glycerophosphat-Dehydrogenase (GPDH) und-Hydroxybuttersäure-Dehydrogenase (HBDH) histochemisch nachgewiesen und ihr Verteilungsbild in den beiden Drüsenlappen studiert. Darüber hinaus wurden histochemische Reaktionen auf folgende Enzyme durchgeführt: Cytochromoxydase (nachBurston), Leucinaminopeptidase (nachNachlas,Crawford undSeligman), alkalische Phosphatase (nachGomori), ATPase (nachPadykula undHerman). Fette wurden mit Scharlachrot und Sudan Schwarz B gefärbt. Die histochemisch faßbare Aktivitätsverteilung der Enzyme geht aus der Tabelle 1 hervor. Die Befunde werden diskutiert.

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Summary A study was conducted to investigate the distribution pattern of various enzymes in both lobes of the Harder gland in rabbits by means of the tetrazolium technique [NADH-tetrazoliumreductase (NADH-T-Red), NADPH-tetrazolium-reductase (NADPH-T-Red), NAD-specific isocitrate-dehydrogenase (NAD-IDH), succinate-dehydrogenase (SDH), NAD-specific malate-dehydrogenase (NAD-MDH), lactate-dehydrogenase (LDH), glucose-6-phosphate-dehydrogenase (G-6-PDH),-glycerophosphate-dehydrogenase (GPDH), and-hydroxy-butyrate-dehydrogenase (HBDH)]. In addition histochemical tests for the determination of cytochrome-oxidase (Burston), leucine-amino-peptidase (Nachlas,Crawford andSeligman), alkaline phosphatase (Gomori), and ATP-ase (Padykula andHerman) were carried out. Fets were stained with Scharlach-red and Sudan black B. The results of the histochemically determinable enzyme activities are listed in table 1. The findings are discussed.

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Mit dankenswerter Unterstützung durch die Deutsche Forschungsgemeinschaft.     

The Metabolism of Serum Proteins in Neonatal Rabbits

1. Incorporation of S³⁵-labeled amino acids into serum proteins has been studied in neonatal and developing rabbits. It was found that, per unit weight, neonatal rabbits synthesized only about 1/36 of the gamma globulin, 1/7 of the beta globulin, ½ of the alpha globulin, and ⅛ of the albumin that an adult synthesized. The growing rabbit developed the ability to synthesize various serum proteins at different times. 2. Plasma volumes and serum protein concentrations were determined at different times during the growth period of the rabbit. Plasma volumes were found to be 1 and ½ times larger in newborn animals than in adults, with a gradual decline to the adult level. The total serum protein concentration at birth was about 60 to 65 per cent of the adult value and gradually increased with growth as the plasma volume decreased. 3. Half-lives of homologous albumin and gamma globulin were studied. The half-life of albumin in neonates was nearly twice as long as the half-life in adults, the latter value being reached at 1 month of age. The half-life of gamma globulin in neonates was more than twice as long as the half-life in adults and reached adult values at 2 to 3 months. 4. Attempts were made to alter serum protein metabolism. Gamma globulin synthesis early in life was augmented with antigen injections.     

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Der Einfluss elektrophysiologisch wirksamer Substanzen auf das mikroskopische Bild des überlebenden Ranvierschen Schnürrings

Cell and Tissue Research - In Ergänzung vorangehender morphologischer Untersuchungen wurde festgestellt, daß nicht nur anisosmotische Lösungen, sondern auch andere, auf die...     

CHROMOSOME NUMBERS IN COMPOSITAE V. ASTEREAE II.

Reports of 100 new chromosome counts are made for the tribe Astereae of Compositae, mostly based on determinations of meiotic material, including first counts for 9 genera and 53 species. Counts are now available for 58 of the approximately 100–120 genera and 431 of the approximately 2000 species in the tribe. Comparisons are made between chromosome number and habit and also between chromosome number and geographical distribution. Species and genera with a basic number of x = 9 are the most abundant. Within different phyletic lines x = 9 is also the most abundant number. On the other hand, many species with x = 4 and 5, belonging to a number of small, largely annual genera, are concentrated in southwestern North America. The low chromosome number in these plants is probably correlated with the dry habitat they occupy, and is most likely a specialized condition.