Journal ArticleDOI
Chemical Constitution of the Nucleolar Inclusions in Growing Oocyte Cells
J. A. Serra,A. Queiroz Lopes +1 more
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In a study of the nucleolar physiology in two species of Helicidæ—Helix aspersa Müll, and Tachea nemoralis L.—the authors have examined the constitution of the inclusions of some inclusions with a more or less vacuolar appearance formed in its interior.Abstract:
IN many animals during the second period of growth of the oocyte there is a production of nucleolar substance by means of a multiplication of numerous little nucleoli, or the budding of small nucleoli from a principal nucleolus1. When a principal nucleolus exists, in general concomitantly with the production of the buds, some inclusions with a more or less vacuolar appearance are formed in its interior1. In a study of the nucleolar physiology in two species of Helicidae—Helix aspersa Mull, and Tachea nemoralis L.—we have examined the constitution of these inclusions. They are not aqueous vacuoles; though they can be, and probably in general are, less dense than the body of the nucleolus; when centrifuged they are not markedly dislocated and in concentrated salt solutions the volume of the inclusions does not diminish more than the rest of the nucleolus.read more
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Book ChapterDOI
Structure and Chemistry of Nucleoli
TL;DR: Studies of electron micrographs of thin sections of nucleoli shows that the nucleolus contains two structural phases: one being essentially structureless, the other being a fine, highly coiled, stranded material.
Journal ArticleDOI
Histochemical tests for proteins and amino acids; the characterization of basic proteins.
TL;DR: The author describes the histochemical arginine reaction, recently introduced by him, by means of which the characterization of basic and non-basic proteins can be easily accomplished in every laboratory without costly apparatus.
Journal ArticleDOI
Studies on the nucleolar vacuole in the oogenesis of Arbacia punctulata
TL;DR: The nucleolar vacuole appears at the time that yolk synthesis begins, and continues to grow at the same rate as the surrounding nucleolar cortex, but at its first appearance it shows an intense staining reaction for bound lipids.
Journal ArticleDOI
The crystalline structure of melanin, keratin and collagen.
TL;DR: The crystalline nature of melanin, keratin and collagen is established by direct visualization using Roentgen-ray diffraction for the first time.
References
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Journal ArticleDOI
Studien ber den Eiweiumsatz der Zelle
TL;DR: In this paper, the authors describe a series of charakteristische Absorptions of Zellstrukturen in an einzelner Zellteile in an Absorptionspektrum, a.k.a., the Menge solcher Substanzen bestimmen lassen.
Book ChapterDOI
Studien über den Eiweißumsatz der Zelle
TL;DR: In this paper, a charakteristische Absorptionsbander innerhalb des optischen Spektrums is introduced, in which the Zellestrukturen in der Regel sehr klein sind, mussen derartige Messungen an Elementen with einem Durchmesser von bis zu I µ herab und darunter vorgenommen werden.
Journal ArticleDOI
Eine neue histochemische Reaktion — Die Reaktion des Arginins
TL;DR: In this paper, Isom et al. discuss the problem of finding a suitable location for a new home for the Molekfil family in the Land of the Free State of Israel.
Journal ArticleDOI
Direkter Nachweis basischer Proteine in den Chromosomen und im Nukleolus
J. A. Serra,A. Queiroz-Lopes +1 more
TL;DR: Eine kriiftige histochemische Reaktion zeigt das Vorhandensein yon basischen Proteinen an, wobei die Intensitat der Ffirbung f ~r halb-quantitative Zwecke dienen kann, die f~r den augenblicklichen Stand der Histochemie ausreichen.