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1.
外加电磁场对火焰结构及燃料燃烧特性的影响 总被引:1,自引:0,他引:1
燃料在电、磁场作用下的燃烧是一个新的跨学科性质的研究课题.它涉及磁流体发电、空间技术中电磁燃烧技术的应用以及能源与动力工程中能量转换与效率.本文从实验和理论两个方面,扼要地报导了碳氢燃料在外加磁场、电场影响下的火焰结构及其燃烧特性.把近年来我研究小组的主要研究结果汇总发表. 相似文献
2.
D. V. Amin R. B. Doctor A. O. Girdhar U. H. Shah 《Cellular and molecular life sciences : CMLS》1980,36(12):1410-1411
Summary Prostaglandin (PG) release was measured from the isolated perfused rabbit heart. The effects of -adrenergic stimulation and blockade suggest that PG synthesis is regulated in part by adrenergic mechanisms. 相似文献
3.
Rasmussen SG DeVree BT Zou Y Kruse AC Chung KY Kobilka TS Thian FS Chae PS Pardon E Calinski D Mathiesen JM Shah ST Lyons JA Caffrey M Gellman SH Steyaert J Skiniotis G Weis WI Sunahara RK Kobilka BK 《Nature》2011,477(7366):549-555
G protein-coupled receptors (GPCRs) are responsible for the majority of cellular responses to hormones and neurotransmitters as well as the senses of sight, olfaction and taste. The paradigm of GPCR signalling is the activation of a heterotrimeric GTP binding protein (G protein) by an agonist-occupied receptor. The β(2) adrenergic receptor (β(2)AR) activation of Gs, the stimulatory G protein for adenylyl cyclase, has long been a model system for GPCR signalling. Here we present the crystal structure of the active state ternary complex composed of agonist-occupied monomeric β(2)AR and nucleotide-free Gs heterotrimer. The principal interactions between the β(2)AR and Gs involve the amino- and carboxy-terminal α-helices of Gs, with conformational changes propagating to the nucleotide-binding pocket. The largest conformational changes in the β(2)AR include a 14 ? outward movement at the cytoplasmic end of transmembrane segment 6 (TM6) and an α-helical extension of the cytoplasmic end of TM5. The most surprising observation is a major displacement of the α-helical domain of Gαs relative to the Ras-like GTPase domain. This crystal structure represents the first high-resolution view of transmembrane signalling by a GPCR. 相似文献
4.
Miwi catalysis is required for piRNA amplification-independent LINE1 transposon silencing 总被引:1,自引:0,他引:1
Reuter M Berninger P Chuma S Shah H Hosokawa M Funaya C Antony C Sachidanandam R Pillai RS 《Nature》2011,480(7376):264-267
5.
New Sivapithecus humeri from Pakistan and the relationship of Sivapithecus and Pongo 总被引:2,自引:0,他引:2
New humeri of two species of the Miocene hominoid Sivapithecus are described from near Chinji in Pakistan from between approximately 9 and 11 Myr ago. Sivapithecus, a middle and late Miocene hominoid from Turkey and Indo-Pakistan, is overall unlike any living hominoid, although facial-palatal similarities to the extant orangoutan, Pongo, have been used to support a hypothesis of close relationship. Living hominoids have postcranial similarities assumed to be shared derived, among them features of the proximal humerus. However, the new Sivapithecus proximal humeri differ from those of living hominoids, supporting an alternative hypothesis in which Sivapithecus and Pongo are not closely related. It is not clear how to choose between these incompatible hypotheses. 相似文献
6.
Given a set of pairwise distances on a set of n points, constructing an edgeweighted tree whose leaves are these n points
such that the tree distances would mimic the original distances under some criteria is a fundamental problem. One such criterion
is to preserve the ordinal relation between the pairwise distances. The ordinal relation can be of the form of total order
on the distances or it can be some partial order specified on the pairwise distances. We show that the problem of finding
a weighted tree, if it exists, which would preserve the total order on pairwise distances is NP-hard. We also show the NP-hardness
of the problem of finding a weighted tree which would preserve a particular kind of partial order called a triangle order,
one of the most fundamental partial orders considered in computational biology. 相似文献
7.
8.
Summary Sperm motility and metabolism are dependent upon the levels of cyclic AMP. Our studies have demonstrated that spermine by inhibiting sperm phosphodiesterase activity could regulate sperm physiology. 相似文献
9.
R. V. Shah 《Cellular and molecular life sciences : CMLS》1960,16(4):165-165
Zusammenfassung Es wird eine Methode beschrieben, die es ermöglicht, mit Hilfe eines gefärbten Agarfilms, der durch Löcher in Stanniolpapier gepresst wird, am Amphibien-Ei regelmässige Reihen von Vitalfarbmarken zu setzen. 相似文献
10.
阳离子淀粉CST制备及脱色性能研究 总被引:12,自引:0,他引:12
研究了在基本干的反应条件下制备阳离子淀粉的方法及其脱色性能,确定了用氢氧化钠作催化剂时的最佳反应条件。 相似文献