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排序方式: 共有191条查询结果,搜索用时 31 毫秒
1.
王永红 《科技情报开发与经济》2004,14(6):139-141
通过1998年、2000年的试验研究,系统分析了顶凌覆盖技术在高寒区节水增温保温、增产增收的机理及其应用效果。提出该技术可以缓解低温干旱特别是春旱对农业生产的困扰,是一项可以抗旱保春播增产增收的实用技术,在高寒地区具有较高的推广价值。 相似文献
2.
The transfer of Sr~(2+) and Ba~(2+) ion, facilitated by 18-Crown-6 present in the aqueous phase, and of succinylcholine ion at w/nb interface were investigated by semi-differential cyclic voltammetry. A good polarographic curve of succinylcholine ion dissolved in water was obtained in the system of 0.01 mol/l LiCl (w)——0.01 mol/l TBATPB (nb). The peak current is directly proportional to the concentration of SC~(2+) ion. It can be used for the determination of SC and the detection limit is 1.05×10~(-5) mol/l.The apparent D~w and D~(nb) have been estimated. The transfer of Sr~(2+) and of Ba~(2+) at the interface are facilitated by 18-Crown-6 present in the aqueous phase and the peak current is directly proportional to the concentration of 18-Crown-6 in water. This method can be used for the determination of the complexing agent and for the stability constant of the complex formed in the aqueous phase.All the experimental results are in keeping with the theoretical. 相似文献
3.
S. Shiozawa K. Shiozawa S. Shimizu Y. Tanaka I. Morimoto Y. Kuroki R. Yoshihara T. Fujita 《Cellular and molecular life sciences : CMLS》1989,45(8):764-765
Summary A sensitive radioimmunoassay showed that circulating -interferon in the plasma of healthy individuals was low in children and reached the highest level in the young adult, then declined gradually with age. Circulating -interferon was 0.201±0.059 ng/ml in males (n=19) and 0.184±0.076 ng/ml in females (n=14) at ages 30–39 years old. It was noted that circulating -interferon was maintained up to a certain level even in elderly individuals. 相似文献
4.
T. Hatano Y. Kato M. Katayama S. Marumo 《Cellular and molecular life sciences : CMLS》1989,45(4):400-402
Summary A new potent antiauxin, -(5,7-dichloroindole-3-)isobutyric acid has been synthesized and shown to inhibit auxin-mediated elongation ofAvena coleoptiles and to stimulate root growth of rice seedlings. Its activity is stronger than -(p-chlorophenoxy)isobutyric acid and is comparable to that of 2,3,5-triiodobenzoic acid, which are typical antiauxins. 相似文献
5.
E. Flückiger U. Briner B. Clark A. Closse A. Enz P. Gull A. Hofmann R. Markstein L. Tolcsvai H. R. Wagner 《Cellular and molecular life sciences : CMLS》1988,44(5):431-436
Summary The profile of action in animals of CQP 201-403, a novel 8-amino-ergoline, is in most aspects that of a very potent dopaminomimetic, both as a prolactin secretion inhibitor, and at the levels of the CNS and the cardiovascular system. Qualitatively CQP 201-403 differs slightly from bromocriptine and apomorphine in its effects on the CNS (no influence on serotonin metabolism in the rat cortex; induction of masculine mounting behavior in rats) and the cardiovascular system of the dog (reflex tachycardia in response to a blood-pressure fall). In man the new compound proved to be highly active in lowering prolactin serum levels and to be more potent than bromocriptine (Parlodel®).In memory of Dr Annemarie Closse, who died 14 June 1987. 相似文献
6.
We demonstrate for the first time a hair cycle-dependent gene and protein expression of proopiomelanocortin in mouse skin in vivo. Northern blot detected POMC mRNA with an apparent size of 0.9 kb in anagen but not telogen skin. Western blot emphasized a specific protein of 30–33 kDa recognized by anti -endorphin in late but not early anagen or telogen skin. By immunocytochemistry, -endorphin antigen was localized in the sebaceous gland in a hair cycle dependent manner. 相似文献
7.
S. Burstein S. A. Hunter V. Latham L. Renzulli 《Cellular and molecular life sciences : CMLS》1987,43(4):402-403
Summary The results described here demonstrate that THC-induced catalepsy in mice can be substantially inhibited by the prior administration of 1-THC-7-oic acid, the major metabolite of THC in most species including humans. This raises the possibility that the intensity and duration of action of THC may depend to a large degree on the levels of this metabolite at the sites of action.We thank the National Institute on Drug Abuse for supporting this project by grants DA-02043 and DA-02052 and for supplying all of the cannabinoids. One of us (S.B.) is also the recipient of a Research Scientist Award from NIDA. We are grateful to Kristen Carlson and Thomas Honeyman for helpful suggestions in preparing this report. 相似文献
8.
9.
张红敏 《科技情报开发与经济》2003,13(1):162-163
系统分析了水泥稳定土强度的影响因素,包括土的化学成分、物理组成的影响,水泥的影响,混合料干密度和含水量的影响及施工中其他因素的影响。 相似文献
10.
利用旋转黏度计,全面研究连铸保护渣的黏度、凝固温度和黏性活化能与碱度、综合碱度之间的关系.在本实验渣系条件下,随着综合碱度的增大,连铸保护渣的黏度、凝固温度和黏性活化能均逐渐减小,并且随着综合碱度的增大,其对黏性特征的影响作用逐渐减弱.利用连铸保护渣的黏度、凝固温度和黏性活化能与综合碱度的回归方程,可以全面考察渣中各组元对连铸保护渣黏性特征的影响作用,精确预测连铸保护渣的黏性特征.当综合碱度为2.0时,连铸保护渣的黏度为0.17 Pa.s,凝固温度为1 030℃,黏性活化能为120 kJ.mol-1.综合国内外连铸保护渣应用实践,连铸保护渣的综合碱度应大于2.0,此时连铸保护渣的黏性特征保持相... 相似文献