全文获取类型
收费全文 | 105983篇 |
免费 | 7239篇 |
国内免费 | 16篇 |
出版年
2023年 | 563篇 |
2022年 | 412篇 |
2021年 | 995篇 |
2020年 | 922篇 |
2019年 | 934篇 |
2018年 | 2577篇 |
2017年 | 2295篇 |
2016年 | 3216篇 |
2015年 | 4806篇 |
2014年 | 4868篇 |
2013年 | 6524篇 |
2012年 | 8000篇 |
2011年 | 7485篇 |
2010年 | 4742篇 |
2009年 | 3482篇 |
2008年 | 6137篇 |
2007年 | 6070篇 |
2006年 | 5539篇 |
2005年 | 5179篇 |
2004年 | 4848篇 |
2003年 | 4476篇 |
2002年 | 4115篇 |
2001年 | 2136篇 |
2000年 | 2108篇 |
1999年 | 1820篇 |
1998年 | 750篇 |
1997年 | 583篇 |
1996年 | 513篇 |
1995年 | 529篇 |
1994年 | 539篇 |
1993年 | 407篇 |
1992年 | 1222篇 |
1991年 | 1143篇 |
1990年 | 1012篇 |
1989年 | 942篇 |
1988年 | 885篇 |
1987年 | 753篇 |
1986年 | 685篇 |
1985年 | 764篇 |
1984年 | 661篇 |
1983年 | 551篇 |
1982年 | 424篇 |
1981年 | 414篇 |
1979年 | 569篇 |
1978年 | 439篇 |
1977年 | 391篇 |
1976年 | 376篇 |
1975年 | 427篇 |
1974年 | 444篇 |
1973年 | 452篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
971.
A Tremblay J C?té J LeBlanc 《European journal of applied physiology and occupational physiology》1983,52(1):1-4
The influence of exercise-training on dietary-induced thermogenesis (DIT) was investigated in humans. The resting metabolic rate was identical in trained and non-trained subjects, but the response to a meal containing 1,636 kcal (6.9 MJ) was markedly lower in trained subjects. Mean dorsal skin temperature, as measured by thermography, was not influenced by training. A significant correlation was observed between postprandial RQ and DIT, which indicates that the reduced energy expenditure noted in trained subjects is related to a greater lipid oxidation. This sparing effect of exercise-training on energy utilization in the form of carbohydrate, is interpreted as adaptive in the sense that energy is preserved for the purpose of producing work. 相似文献
972.
Summary Recently, the existence of a vasopressin-immunoreactive cell group was described in the bed nucleus of the stria terminalis (van Leeuwen and Caffé 1983). In the present investigation additional nuclei containing vasopressin-immunoreactive cells were found, after colchicine pretreatment, in the dorsomedial hypothalamus, medial amygdaloid nucleus and the locus coeruleus.Vasopressin-immunoreactive cells in the dorsomedial hypothalamus and medial amygdaloid nucleus are small (8–14 m and 10–14 m, respectively), while those in the locus coeruleus are medium-sized (20–25 m). Incubation with anti-bovine neurophysin II and anti-rat neurophysin revealed staining of the same cell group in the above-mentioned areas. None of these cell groups show stained cells after incubation with anti-oxytocin and anti-bovine neurophysin I. When sections of the homozygous Brattleboro rat, which shows a deficiency in vasopressin synthesis, are incubated with anti-vasopressin, anti-bovine neurophysin II, or anti-rat neurophysin, no immunoreactivity can be observed in these brain regions.The above-mentioned cell groups may contribute to the vasopressinergic innervation of brain sites that have been reported to persist after lesioning of the suprachiasmatic, paraventricular and bed nuclei of the stria terminalis. 相似文献
973.
Summary The apical cell coat of the olfactory epithelium proper and the vomeronasal neuroepithelium of the rat was investigated electronmicroscopically by means of the Ruthenium-red reaction. In the olfactory epithelium proper, the cilia of receptor cells and microvilli of supporting cells possess a cell coat measuring approximately 10 nm in thickness. In the vomeronasal neuroepithelium, the apical cell coat is thicker than in the olfactory epithelium proper. On microvilli of vomeronasal receptor cells the cell coat varies in thickness from 15 to 20 nm, and on microvilli of supporting cells it measures approximately 75 nm. The functional implications of these findings are discussed.A portion of this study was presented at the 6th European Anatomical Congress in Hamburg. This publication is dedicated to Prof. E. KlikaSupported by the Deutsche Forschungsgemeinschaft (Br 358/5-1). 相似文献
974.
Lambda Ig constant region genes are translocated to chromosome 8 in Burkitt''s lymphoma with t(8;22) 总被引:11,自引:4,他引:7
下载免费PDF全文
![点击此处可从《Nucleic acids research》网站下载免费的PDF全文](/ch/ext_images/free.gif)
A de la Chapelle G Lenoir J Boué A Boué P Gallano C Huerre M F Szajnert M Jeanpierre J M Lalouel J C Kaplan 《Nucleic acids research》1983,11(4):1133-1142
By in situ hybridization of normal human chromosomes with a cloned genomic probe specific for the constant region of the lambda immunoglobulin genes, band 22q11 was preferentially labelled. In two cell lines with t(8;22) derived from Burkitt's lymphoma a strong signal was noted on the 8q+ chromosome derivative, indicating that the constant region of the lambda Ig gene cluster was translocated from chromosome 22 to chromosome 8. In addition, the signal observed on the 22q- derivative chromosome was stronger than the background in one of the two cell lines tested, but not in the other. The implications are that the break point in chromosome 22 in some cases lies within the Ig gene itself or between clusters of such genes, and that different cases have different break points. 相似文献
975.
976.
977.
978.
979.
Lysogenic conversion in the Shigella flexneri group 总被引:1,自引:0,他引:1
980.