全文获取类型
收费全文 | 135297篇 |
免费 | 8612篇 |
国内免费 | 712篇 |
专业分类
耳鼻咽喉 | 1290篇 |
儿科学 | 4529篇 |
妇产科学 | 3326篇 |
基础医学 | 18934篇 |
口腔科学 | 4363篇 |
临床医学 | 14824篇 |
内科学 | 29119篇 |
皮肤病学 | 3102篇 |
神经病学 | 13149篇 |
特种医学 | 3031篇 |
外国民族医学 | 1篇 |
外科学 | 11896篇 |
综合类 | 785篇 |
一般理论 | 111篇 |
预防医学 | 14650篇 |
眼科学 | 2065篇 |
药学 | 9090篇 |
中国医学 | 441篇 |
肿瘤学 | 9915篇 |
出版年
2024年 | 139篇 |
2023年 | 1184篇 |
2022年 | 2438篇 |
2021年 | 4135篇 |
2020年 | 2700篇 |
2019年 | 3788篇 |
2018年 | 4232篇 |
2017年 | 3211篇 |
2016年 | 3767篇 |
2015年 | 4153篇 |
2014年 | 5421篇 |
2013年 | 7315篇 |
2012年 | 10920篇 |
2011年 | 11303篇 |
2010年 | 6192篇 |
2009年 | 5271篇 |
2008年 | 9280篇 |
2007年 | 9422篇 |
2006年 | 8805篇 |
2005年 | 8261篇 |
2004年 | 7492篇 |
2003年 | 6802篇 |
2002年 | 6193篇 |
2001年 | 816篇 |
2000年 | 595篇 |
1999年 | 833篇 |
1998年 | 1193篇 |
1997年 | 926篇 |
1996年 | 825篇 |
1995年 | 708篇 |
1994年 | 654篇 |
1993年 | 572篇 |
1992年 | 433篇 |
1991年 | 312篇 |
1990年 | 317篇 |
1989年 | 299篇 |
1988年 | 275篇 |
1987年 | 230篇 |
1986年 | 267篇 |
1985年 | 239篇 |
1984年 | 248篇 |
1983年 | 241篇 |
1982年 | 295篇 |
1981年 | 253篇 |
1980年 | 263篇 |
1979年 | 132篇 |
1978年 | 135篇 |
1977年 | 130篇 |
1976年 | 121篇 |
1975年 | 102篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
112.
113.
Michael K. Gardner Elaine Clark Mary Ann C. Bowman Patrick J. Miller 《Alcoholism, clinical and experimental research》1989,13(4):508-511
This study investigated analogical reasoning abilities of alcoholics who had been abstinent from alcohol for at least 1 year. Their performance was compared to that of nonalcoholic controls matched as a group for education, age, and gender. Solution times and error rates were modeled using a regression model. Results showed a nonsignificant trend for alcoholics to be faster, but more error prone, than controls. The same componential model applied to both groups, and fit them equally well. Although differences have been found in analogical reasoning ability between controls and alcoholics immediately following detoxification, we find no evidence of differences after extended periods of sobriety. 相似文献
114.
Federigo Sicuteri Maria Nicolodi Bruno Marcello Fusco Salvatore Orlando 《Headache》1991,31(9):577-581
Following tooth pulp extirpation, some subjects suffer from persistent pain which affects edentate sites in absence of any local pathology. As regards this peculiar pain, called phantom tooth pain (PTP), what is puzzling is the fact there is a low prevalence of PTP in a very large population showing identical conditions of tooth pulp extirpation. The present investigation indicates that PTP mainly affects migraine (M) and cluster headache (CH) sufferers, whereas it does not affect subjects who have a negative personal and family history for idiopathic headache (IH). These results circumscribe the presence of PTP to a specific section of the population. The present results, besides indicating that PTP may be the result of a peculiar neuronal predisposition relating to IH pathogenesis, suggests some practical therapeutic hints. In fact, successful anti- M and anti-CH prophylactic treatment greatly improve PTP syndrome. 相似文献
115.
116.
117.
Ann McPherson 《British medical journal》2005,330(7489):465-467
118.
Ann G Schwartz Geoffrey M Prysak Valerie Murphy Fulvio Lonardo Harvey Pass Jan Schwartz Sam Brooks 《Clinical cancer research》2005,11(20):7280-7287
PURPOSE: A role for estrogens in determining lung cancer risk and prognosis is suggested by reported sex differences in susceptibility and survival. Archival lung tissue was evaluated for the presence of nuclear estrogen receptor (ER)-alpha and ER-beta and the relationship between ER status, subject characteristics, and survival. EXPERIMENTAL DESIGN: Paraffin-embedded lung tumor samples were obtained from 214 women and 64 men from two population-based, case-control studies as were 10 normal lung autopsy samples from patients without cancer. Nuclear ER-alpha and ER-beta expression was determined by immunohistochemistry. Logistic regression was used to identify factors associated with ER positivity and Cox proportional hazards models were used to measure survival differences by ER status. RESULTS: Neither tumor (0 of 94) nor normal (0 of 10) lung tissue stained positive for ER-alpha. Nuclear ER-beta positivity was present in 61% of tumor tissue samples (170 of 278; 70.3% in men and 58.3% in women) and 20% of normal tissue samples (2 of 10; P = 0.01). In multivariate analyses, females were 46% less likely to have ER-beta-positive tumors than males (odds ratio, 0.54; 95% confidence interval, 0.27-1.08). This relationship was stronger and statistically significant in adenocarcinomas (odds ratio, 0.40; 95% confidence interval, 0.18-0.89). Women with ER-beta-positive tumors had a nonsignificant 73% (P = 0.1) increase in mortality, whereas men with ER-beta-positive tumors had a significant 55% (P = 0.04) reduction in mortality compared with those with ER-beta-negative tumors. CONCLUSIONS: This study suggests differential expression by sex and influence on survival in men of nuclear ER-beta in lung cancer, particularly in adenocarcinomas. 相似文献
119.
Zoï Kapoula Maria Pia Bucci Frederic Jurion Julie Ayoun Farzaneh Afkhami Dominique Brémond-Gignac 《Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie》2006,245(7):931-936
Aim There is a controversy as to whether dyslexic children present visuo-motor disabilities such as vergence and accommodative
problems assessed with orthoptic tests. The purpose of this study is to re-examine this issue in a large population of children.
Methods Extensive orthoptic evaluation was made in 57 dyslexic and 46 non-dyslexic (“normal”) age-matched children. Convergence and
divergence capacities were evaluated at two distances (30 cm and 400 cm).
Results Binocular vision measured with stereo-acuity tests was normal in dyslexics. In contrast, the near point of convergence was
significantly more remote in dyslexics; most importantly, divergence at both far and near distance was significantly more
reduced in dyslexics (median value 4 pD and 10 pD, respectively, at far and near) than in “normals” (median value 6 pD and
12 pD, at far and near).
Conclusion The existence of the divergence deficit at far distance indicates the presence of deficit of divergence per se, independently
from convergence and accommodation relaxation. This result is novel and corroborated by physiological studies indicating distinct
control of convergence and divergence, both at the cortical and subcortical premotor level. We conclude that vergence deficits
are frequently present in dyslexics, and that dyslexics should be re-educated; training should address distinctively convergence
and divergence subsystems. 相似文献
120.