全文获取类型
收费全文 | 1539篇 |
免费 | 121篇 |
国内免费 | 2篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 134篇 |
妇产科学 | 52篇 |
基础医学 | 170篇 |
口腔科学 | 31篇 |
临床医学 | 111篇 |
内科学 | 350篇 |
皮肤病学 | 18篇 |
神经病学 | 101篇 |
特种医学 | 101篇 |
外科学 | 121篇 |
综合类 | 131篇 |
一般理论 | 1篇 |
预防医学 | 142篇 |
眼科学 | 9篇 |
药学 | 64篇 |
肿瘤学 | 125篇 |
出版年
2021年 | 37篇 |
2019年 | 16篇 |
2018年 | 27篇 |
2017年 | 17篇 |
2016年 | 16篇 |
2015年 | 26篇 |
2014年 | 25篇 |
2013年 | 34篇 |
2012年 | 55篇 |
2011年 | 46篇 |
2010年 | 43篇 |
2009年 | 35篇 |
2008年 | 49篇 |
2007年 | 34篇 |
2006年 | 46篇 |
2005年 | 40篇 |
2004年 | 49篇 |
2003年 | 36篇 |
2002年 | 36篇 |
2001年 | 36篇 |
2000年 | 33篇 |
1999年 | 53篇 |
1998年 | 48篇 |
1997年 | 43篇 |
1996年 | 33篇 |
1995年 | 20篇 |
1994年 | 40篇 |
1993年 | 25篇 |
1992年 | 36篇 |
1991年 | 25篇 |
1990年 | 26篇 |
1989年 | 26篇 |
1988年 | 33篇 |
1987年 | 37篇 |
1986年 | 32篇 |
1985年 | 39篇 |
1984年 | 21篇 |
1983年 | 21篇 |
1982年 | 27篇 |
1981年 | 20篇 |
1980年 | 16篇 |
1979年 | 25篇 |
1978年 | 23篇 |
1977年 | 21篇 |
1976年 | 22篇 |
1974年 | 18篇 |
1972年 | 20篇 |
1971年 | 16篇 |
1970年 | 16篇 |
1969年 | 23篇 |
排序方式: 共有1662条查询结果,搜索用时 0 毫秒
1.
2.
A B Fulton J Dodge J L Schremser A Armstrong F Lanier W W Dawson T P Williams 《Current eye research》1990,9(12):1211-1216
The content of rhodopsin in the eyes of 15 donors (30 eyes) was determined. Both retinal and pigment epithelial fractions were collected from each globe, extracted using 1% CTAB, and the rhodopsin difference spectrum of each fraction was obtained separately. The total amount of rhodopsin, obtained by summing the amounts recovered from the retinal and PE fractions, ranged from 2.00 to 11.94 (median: 6.40) nmoles/eye. Previously reported mean values of about 3.5 to 4.0 nmoles per retina have been obtained using a variety of methods. The present higher values, perhaps largely dependent on procedural details described herein, appear plausible given the known concentrations of rhodopsin in rod outer segments, rod outer segment volumes, and number of rods in the human retina. 相似文献
3.
4.
5.
HERMAN TOURNAYE RONNY JANSSENS PAUL DEVROEY RK VAN STEIRTEGHEM 《International journal of andrology》1994,17(1):1-8
In order to evaluate the effects of pentoxifylline on sperm motility and longevity, a controlled in-vitro study was conducted on normozoospermic donor semen samples using the Cellsoft automated system for sperm motility analysis. After incubation and selection, pentoxifylline was found to improve the recovery of spermatozoa and to increase their velocity. In the subgroup of progressively motile spermatozoa, curvilinear velocity was also enhanced. It is concluded that pentoxifylline has an effect on the vigour, but not on the pattern, of sperm motion. Pentoxifylline did not improve the motility characteristics of senescent spermatozoa in normozoospermic sperm samples. Sperm survival, as shown by supra-vital staining, and motility longevity both decreased with time after pentoxifylline treatment. 相似文献
6.
S J McLaughlin E A Dodge J Ashworth J Connors 《The Australian and New Zealand journal of surgery》1988,58(8):679-681
A 26 year old female presented with partial expression of Carney's triad. This is the first Australian report of the condition. The role of surgery and the need for vigilance to detect the occurrence of the complete triad are stressed. 相似文献
7.
V. JNSSON H. D. SCHRDER W. TROJABORG T. STAEHELIN JENSEN E. HIPPE M. MRK HANSEN 《Journal of internal medicine》1992,232(2):185-191
A study of 17 patients with autoimmune axonal or demyelinating peripheral neuropathy in combination with M-component is described. The M-component was associated with MGUS (monoclonal gammopathy of undetermined significance) in 12 patients, CLL in one patient, WaldenstrÖm's disease in one patient, and myeloma in three patients. Immunohistological examination with direct and indirect fluorescence showed binding of antibodies to nerve structures of the same class and light chain as seen in the M-component. In five cases of IgM M-component, the demyelinating neuropathy was caused by binding of the IgM M-protein and complement C3b to myelin-associated glycoproteins (MAG). In 12 cases with axonal neuropathy, binding of IgG to the connective tissue of the peri- and endoneurium was found in 50% of cases, IgM in five cases, and IgD in one case. None of the patients had central nervous system (CNS) symptoms. The clinical and therapeutic difficulties are discussed; only two patients with an acute course responded to immunosuppression. A marked co-expression of other autoimmune phenomena is interpreted in the light of cross-reactions between the autoantibody and similar tissue autoantigens. 相似文献
8.
A 26 year old female presented with partial expression of Carney's triad. This is the first Australian report of the condition. The role of surgery and the need for vigilance to detect the occurrence of the complete triad are stressed. 相似文献
9.
10.