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Studies in the origin of yolk. IV. Ogenesis of Periplaneta americana
Author(s) -
Nath Vishwa,
Mohan Piare
Publication year - 1929
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.1050480109
Subject(s) - yolk , biology , cytoplasm , nucleolus , golgi apparatus , vesicle , vacuole , homogeneous , microbiology and biotechnology , anatomy , biochemistry , endoplasmic reticulum , food science , physics , membrane , thermodynamics
Technique. This work is based not only on the fixed preparations, but also on fresh cover‐slip preparations treated with neutral red or 2 per cent osmic acid for a short time. Golgi elements and fatty yolk. The Golgi elements are hollow vesicular bodies with a distinct osmiophilic rim and a central osmiophobic substance. In the youngest oocyte they form a circumnuclear ring. Gradually the vesicles spread out, grow in size, store up fat in their interior, and give rise to the fatty yolk. On account of their higher refractive index, due to the presence of fat, the Golgi vesicles can be occasionally seen even in the young oocytes without any treatment. Mitochondria. The mitochondrial granules also form a circumnuclear ring and are later distributed uniformly. Albuminous yolk. The albuminous yolk is nucleolar in origin. Early in oogenesis, the nucleous buds off small, homogeneous, and highly chromatic particles in the cytoplasm, which sooner or later disappear. Subsequently, the nucleolus becomes less chromatic and develops vacuolar bodies in its interior, which, becoming vacuolated exactly like the parent nucleolus, migrate into the the cytoplasm. These bodies become more and more chromatic and travel toward the periphery of the egg, where they grow in size. Ultimately they break down into small, homogeneous, and highly chromatic bodies which are the definitive albuminous yolk spheres and which subsequently grow enormously in size.