Download Advances in Genetics by M. Demerec (Eds.) PDF

By M. Demerec (Eds.)

This quantity in a sequence on genetics, emphasizes the range of genetic reviews. Articles hide the filamentous fungus neurospora, biogenesis of yeast ribosomes, evolutionary genetics of fish, drosophila transposable components and the dropophila gene zeste.

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Smear fixed with Perenyi, then stained with ferric hematoxylin and erythrosin. Nuclear axial thread, n. 32. Smear fixed with alcohol, then stained with Delafield hematoxylin. Nuclear axial thread, n. 36. Smear fixed with chloroform for 30 seconds, then Feulgen reaction. Positive reaction of nuclear axial thread ( n ) inside and outaide the two spores (8). 37. Same as Fig. 36. Old cell, in which the protoplasm is almost completely disintegrated, a short time before the liberation of the two spores ( 8 ) .

Smear fixed with Perenyi, then stained with ferric hematoxylin and erythrosin. Nuclear element ( n ) is sometimes displaced by a lipid globule ( 1 ) . 21. %day culture. , S c h 3 reagent 6 hours, light green). Same structures as Fig. 20. Fxos. 22-26. Bacillus B. 22. %-hour culture. Vital staining of metachromatic granules ( m ) with methylene blue. 23. 48-hour culture. Staining of lipid globules ( 1 ) with Sudan black. 24. 24-hour culture. Smear fixed with Perenyi, then stained with ferric hematoxylin and erythrosin.

The lower rod in the group of three rods (left) shows median constriction preceding separation; in single rod to the right of this group, the two nuclear elements show the enlargement that characterises the beginning of division. 83. E. coli, strain B/r/sd, grown on agar with streptomycin (%hour culture). Giemsa staining. Cells show short axial nuclear threads in the longer rods and globular nuclear elements in the very short rods. “Snakes” are rare; the area photographed was selected to show several.

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