全文获取类型
收费全文 | 430篇 |
免费 | 0篇 |
专业分类
化学工业 | 2篇 |
金属工艺 | 1篇 |
机械仪表 | 1篇 |
矿业工程 | 1篇 |
轻工业 | 1篇 |
一般工业技术 | 2篇 |
冶金工业 | 422篇 |
出版年
2012年 | 1篇 |
2009年 | 1篇 |
2007年 | 1篇 |
2005年 | 1篇 |
2004年 | 2篇 |
2001年 | 1篇 |
1999年 | 8篇 |
1998年 | 113篇 |
1997年 | 62篇 |
1996年 | 55篇 |
1995年 | 29篇 |
1994年 | 22篇 |
1993年 | 31篇 |
1992年 | 5篇 |
1991年 | 8篇 |
1990年 | 6篇 |
1989年 | 5篇 |
1988年 | 7篇 |
1987年 | 7篇 |
1986年 | 6篇 |
1985年 | 7篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1978年 | 2篇 |
1977年 | 19篇 |
1976年 | 24篇 |
1960年 | 1篇 |
排序方式: 共有430条查询结果,搜索用时 31 毫秒
131.
Desferrioxamine, widely used for the treatment of iron overload in Cooley's anaemia, binds iron so tightly that it should quantitatively remove iron from transferrin. Studies conducted in vivo and in vitro, however, have failed to demonstrate significant depletion of transferrin-bound iron by a stoichiometric excess of desferrioxamine. However, low molecular weight chelating agents, capable of forming ternary complexes with transferrin and ferric iron, can promote a rapid transfer of iron from transferrin to desferrioxamine. A possible mechanism for this facilitated exchange is offered. 相似文献
132.
A series of isomeric methyl octadecynoates was analyzed by mass spectrometry; each isomer gave a unique spectrum. The characteristic ions were those resulting from a McLafferty rearrangement of the allenic sites or of the already-rearranged allenic sites. The acetylenic esters were also subjected to oxymercuration whereupon a carbonyl group was formed at either of the original actylenic carbon atoms providing two oxostearates. Further reaction with NaBH4 formed hydroxy esters which, after silylation, gave diagnostic mass spectra indicative of the triple bond location. Applied to esters with both double and triple bonds, this procedure permitted differentiation between the two types of unsaturation. Methoxyl groups marked the original double bond locations and hydroxyls did so for triple bonds. 相似文献
133.
134.
135.
136.
A reevaluation of the original buoyant density conversion formula used to calculate the molar percentage guanosine + cytosine (% G + C) contents of the accepted species of genus Desulfovibrio has been undertaken. It would appear that the formula used gives values 4-5% lower than those obtained using formulae more generally cited in modern literature. Recalculations of % G + C content values for Lesulfovibrio DNA are presented using the formulae of three different workers, and are compared with those values originally used in the classification of genus Desulfovibrio. 相似文献
137.
The present paper reports the first evidence that homocarnosine-carnosine synthetase from rat brain requires free sulfhydryl groups for activity. The activity of the synthetase can be stabilized by dithioerythritol and inhibited strongly by Cu2+, Cd2+, Hg2+, Zn2+, and to a lesser extent by Ca2+, Ni2+, Li, chlorpromazine, alpha-methyl DOPA and norepinephrine at the concentrations tested. 相似文献
138.
FD Matteis 《Canadian Metallurgical Quarterly》1976,28(19):1228-1229
139.
140.
FD Goebel 《Canadian Metallurgical Quarterly》1976,24(4):275-280