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51.
The influence of sodium azide on open-chain and flavine mononucleotide mediated cyclic photophosphorylation in isolated spinach chloroplasts was investigated under anaerobic conditions. Open chain phosphorylation was completely inhibited with DCMU both in the presence and absence of sodium azide in the experimental medium. Flavine mononucleotide mediated photophosphorylation was only slightly inhibited by DCMU in the absence of sodium azide but inhibited in two steps by increasing amounts of DCMU when sodium azide was present in the medium. The first step can be explained as being mainly an effect of DCMU on an open chain electron transport, with water and H2O2 as electron donors and with flavine mononucleotide — kept in an oxidized state by sodium azide — as the electron acceptor. The second step, as well as the comparatively insensitivity to DCMU in the absence of sodium azide, depends on cyclic photophosphorylation mediated by flavine mononucleotide. 相似文献
52.
INGRID SKOGQVIST 《Physiologia plantarum》1973,28(1):77-80
Thermosensitivity was induced through a heat shock in wheat roots. Chloramphenicol and ethanol decreased the induced sensitivity to a degree where all roots were alive. The heat sensitized wheat roots were more sensitive to high salt concentrations than untreated roots. 相似文献
53.
Testosterone Cytosol “Receptor” in the Rat Levator Ani Muscle 总被引:4,自引:0,他引:4
IT is not known whether the “anabolic” action of the androgenic hormone testosterone1, especially on muscular growth and metabolism, can be explained by the presence and the possible metabolism and “receptors” of the hormone in muscles. There are indeed several categories of muscles which, when dependent on androgens, may or may not respond directly to testosterone. It is conceivable that the hormone affects certain muscles through an increased (sexual or general) activity by way of the central nervous system, or because of the release of another hormone, or secondarily through some change of general metabolism. 相似文献
54.
ABSTRACT. The responses of Dasineura brassicae Winn. (Diptera, Cecidomyiidae) to odours from both male and female midges and from their host ( Brassica napus ) and non-host ( Vicia faba ) plants were studied using a Y-tube olfactometer. Female but not male D. brassicae are attracted to crushed B. napus leaves but not to those of V. faba. Males are attracted to live virgin females, to crushed virgin and mated females and to hexane washes of females, suggesting that the female produces a sex pheromone that attracts males. Males were also attracted to hexane washes of female ovipositors, but not to washes of the bodies of females without ovipositors, suggesting that the ovipositor is the site of pheromone release or production. Males were not attracted to live mated females or to other live or crushed males and mated females were not attracted to other mated females. 相似文献