منابع مشابه
Energy Conversion in Bull Sperm Flagella
With the use of a specially developed incubation chamber the rates of motility, respiration, and fructolysis were measured simultaneously on semen samples. By inhibiting the respiration with antimycin A, and/or the fructolysis with 2-deoxyglucose, the rates of each of the two ATP-producing pathways could be reduced independently. In this way the ratio of the amount of free energy produced by re...
متن کاملAtp-induced Sliding of Microtubules in Bull Sperm Flagella
ATP-induced sliding of doublet microtubules has been recently demonstrated with axonemes of sea urchin sperm flagella which had been briefly digested with trypsin (13) . The specific chemical conditions in which such sliding occurs are the same as those required for the reactivation of beating in demembranated sea urchin sperm cells (4) . The conclusion from these observations, that the bending...
متن کاملThe stiffness of the flagella of impaled bull sperm.
The elastic rigidity (stiffness) of impaled motionless bull sperm flagella has been determined by a manipulatory technique which permitted direct analytical treatment of the experimental system. The effects of external ATP and ADP were measured. It was found that ATP acts as a plasticizing agent, while ADP does not. The stiffness measured for flagella in a medium without ATP was 15 times greate...
متن کاملA selective effect of Ni2+ on wave initiation in bull sperm flagella
Bull sperm that are extracted with 0.1% Triton X-100 and restored to motility with Mg2+-ATP lose coordination and stop swimming in the presence of 0.5 mM NiSO4. Although spontaneous coordination of flagellar waves is lost after exposure to Ni2+, other functions of the flagellum remain intact. The capacity for wave propagation along the flagellum is maintained together with the capacity for micr...
متن کاملStarting transients in sea urchin sperm flagella
Live sea urchin spermatozoa were rendered immotile by lowered pH; Triton-extracted spermatozoa were rendered immotile by either lowered pH or by deprivation of ATP. The spermatozoa began to beat after an increase in pH or as ATP was supplied, and the first bends were recorded on ciné film. Triton-extracted spermatozoa deprived of ATP retained a partially formed basal bend which could be either ...
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ژورنال
عنوان ژورنال: Journal of General Physiology
سال: 1969
ISSN: 1540-7748,0022-1295
DOI: 10.1085/jgp.54.6.782