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• W2004261185 abstract "The Feulgen hydrolysis kinetics was investigated in spermatozoa with different composition in DNA-protein complexes. The species used were: Bos taurus (arginine rich nuclear protein also containing cystine residues), Pichroplus bergi, Triatoma infestans (arginine-rich nuclear protein), Lytechinus variegatus and Apis mellifera (lysine-rich nuclear protein). The spermatozoa were subjected to Feulgen's reaction, after varying the fixative type and the hydrolysis times. Feulgen-DNA values were obtained with an automatic scanning cytophotometric procedure. Differences were demonstrated in the hydrolysis kinetics as a function of differences in composition of the DNA-protein complexes being present in the spermatozoon chromatin. Differences in the profiles of Feulgen hydrolysis curves, having for basis the fixation, were rather clear for bull, grasshopper, and blood-sucking insect spermatozoa than for the sea-urchin and bee spermatozoa. The different hydrolysis kinetics of chromatin of blood-sucking insect spermatozoa compared to that of grasshopper, sea-urchin, and bee sperm cells suggests that, although the first 2 materials contain an arginine-rich germinative protein and the latter 2 ones contain a lysine-rich protein, these differ to each other. The DNA depurination was obtained more quickly for T. infestans (20 min) and P. bergi (10 min) spermatozoa when they were fixed in the ethanol-acetic acid (EA) mixture. Morphologically anomalous bull spermatozoa fixed in the EA mixture presented a quicker depurination (30 min) as compared to the normal cells (1 h). The fast lability to acid hydrolysis in the abnormal cells is certainly due to anomalies in their basic nuclear germinative protein. In the formalin fixed materials the maximal depurination was obtained earlier in bull spermatozoa (30 min) followed by sperm cells of P. bergi, T. infestans, L. variegatus (all of them one-hour hydrolysis) and finally Apis mellifera (2 h hydrolysis). The presence of secondary peaks at the descending branch of the hydrolysis curves of grasshopper and sea-urchin spermatozoa, indicates for these, more than 1 kind of apurinic-acid protein complexes. The spermatozoa bearing arginine-and/or cystine-rich nuclear protein contain a more easily soluble apurinic acid protein complex. Due to the differences in hydrolysis kinetics of chromatin in spermatozoa containing different nuclear germinative proteins, this cellular type does not appear indicated as a haploid control for evaluation of Feulgen-DNA contents of diploid and polyploid somatic cells." @default.
• W2004261185 created "2016-06-24" @default.
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• W2004261185 date "1986-01-01" @default.
• W2004261185 modified "2023-09-24" @default.
• W2004261185 title "Lability to acid hydrolysis in some different DNA-Protein complexes of spermatozoa" @default.
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• W2004261185 doi "https://doi.org/10.1016/s0065-1281(86)80054-x" @default.
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