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61.
Changes in Cell Length During Action Potentials in Chara 总被引:2,自引:0,他引:2
Changes in cell length during excitation in Chara were recordedsimultaneously with extracellular action potentials. Cells stimulatedin artificial pond water (APW) gave a diphasic change in celllength ; that is, a transient shortening followed by a delayedextension. When a cell was stimulated 13 min after aprevious shortening, the extension phase was not evident, andthe amplitude of the shortening was always larger than the previousone. Cells stimulated in moist air gave shortenings with muchlarger amplitudes and much greater durations compared with thosein APW. From such marked differences in both amplitude and durationbetween the two types of shortening it is suggested that theshortening might be caused mainly by an osmotic water movementduring excitation. Net water loss during a single action potentialwas calculated from the cell shortening to be 1.076 nl cm2per impulse or 59800 pmol cm2 per impulse, which couldbe caused by a local enhancement of ionic concentration justoutside the plasmalemma of about 0.74 mN. 相似文献
62.
MASAMI YAMAO HIDEKI SHIMIZU OSAMU NAKAMURA KENJI SOH NOBUYUKI HAMADA KATSUMI KOGA KATSUYA HAYASHI 《Development, growth & differentiation》1977,19(1):41-45
Amino acid incorporation was studied with cell-free extracts and ribosomes prepared from pupal ovaries at different ages of Bombyx mori. Poly(U)-directed 3H-phenylalanine incorporation attained a maximum rate at a certain stage of development, but soon dropped to a low level and was replaced by 3H-leucine incorporation, which was due to endogenous mRNA. The latter incorporation occurred at the stage when actual protein synthesis takes place in the ovaries. “Run-off” of the ribosomes which had a high endogenous activity resulted in an enhancement of the poly(U)-dependent activity. The results indicate that the protein synthesis in the ovary is mainly controlled at the level of mRNA. This was further supported by the fact that the relative amount of an ovarian poly(A)-containing “mRNA” fraction increased in parallel with the endogenous activity. 相似文献
63.
Flowering system of heterodichogamous Juglans ailanthifolia 总被引:1,自引:0,他引:1
64.
65.
EFFECT OF PAPAIN-DIGESTED, UNIVALENT ANTIBODY AGAINST SPERM-BINDING FACTOR ON THE FERTILIZABILITY OF SEA URCHIN EGGS 总被引:1,自引:1,他引:0
Papain-digested, anti-sperm-binding factor serum which has only a species-specific antibody, deprives the egg of fertilizability as well as does undigested serum. This effect is shown to be exerted by direct masking of species-specific sperm-binding sites on the vitelline layer by univalent antibodies. 相似文献