首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   37205篇
  免费   1754篇
  国内免费   94篇
耳鼻咽喉   326篇
儿科学   1181篇
妇产科学   1011篇
基础医学   5011篇
口腔科学   626篇
临床医学   5972篇
内科学   6679篇
皮肤病学   607篇
神经病学   3526篇
特种医学   616篇
外科学   3214篇
综合类   403篇
一般理论   55篇
预防医学   4545篇
眼科学   489篇
药学   2144篇
  2篇
中国医学   68篇
肿瘤学   2578篇
  2024年   148篇
  2023年   211篇
  2022年   397篇
  2021年   792篇
  2020年   499篇
  2019年   805篇
  2018年   906篇
  2017年   621篇
  2016年   653篇
  2015年   836篇
  2014年   1176篇
  2013年   1781篇
  2012年   2668篇
  2011年   2813篇
  2010年   1537篇
  2009年   1297篇
  2008年   2548篇
  2007年   2555篇
  2006年   2583篇
  2005年   2398篇
  2004年   2317篇
  2003年   2195篇
  2002年   2057篇
  2001年   227篇
  2000年   157篇
  1999年   307篇
  1998年   413篇
  1997年   371篇
  1996年   331篇
  1995年   280篇
  1994年   272篇
  1993年   257篇
  1992年   178篇
  1991年   144篇
  1990年   139篇
  1989年   137篇
  1988年   110篇
  1987年   113篇
  1986年   98篇
  1985年   109篇
  1984年   158篇
  1983年   160篇
  1982年   196篇
  1981年   169篇
  1980年   161篇
  1979年   97篇
  1978年   77篇
  1977年   81篇
  1976年   60篇
  1974年   71篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
Investigated personality variables related to compulsive eating (episodic bouts of uncontrolled, excessive eating) in college women. Based on scores on the Compulsive Eating Scale, two groups were selected from a large sample of college women (mean age = 19) and classified high (N = 23) or low (N = 23) with regard to compulsive eating. Participants were administered the Sixteen Personality Factor Test, Social Desirability Scale, Locus of Control Scale, and Bem Sex Role Inventory. Results showed a number of significant differences between high and low groups. On the 16PF, high Ss showed higher inner tension, greater suspiciousness, and less emotional stability (ps <0.001). High Ss were more external in locus of control (p <0.02) and showed a greater need for approval (p <0.025). Sex role data showed a higher Masculine self-ideal (p <0.001) for the high group. There appear to be meaningful differences in personality variables that are related to compulsive eating, Results are discussed in terms of current theories of compulsive eating.  相似文献   
992.
993.
994.
The management of venous leg ulcers can pose quite a challenge to patients and health care providers. This condition can significantly impact quality of life and impose a huge financial burden on the patient and health care system. This review article will discuss the importance of early recognition of high-risk patients, with evaluation and initiation of appropriate multimodality treatment, which must be done in a timely and efficient manner.  相似文献   
995.
996.
Summary: Purpose: The present study was conducted to determine the rate of sudden unexplained death in epilepsy (SUDEP) in a well-defined cohort of patients included in the lamotrigine (LTG) clinical development database.
Methods: A panel of scientists experienced in the area of SUDEP was assembled and provided with case summaries on all deaths (n = 45) reported during the initial clinical development of LTG. The panel developed a set of criteria for classifying cases as SUDEP (definite or highly probable), possible SUDEP, or non-SUDEP. This classification algorithm was then applied to the LTG cases, and SUDEP rates were calculated using patient-years of exposure as the denominator.
Results: At the time of the study, 4,700 patients (5,747 patient-years of exposure) were included in the worldwide LTG clinical trials database. In this cohort, 45 deaths were reported. Eighteen were judged by the panel to be SUDEP, 6 were defined as possible SUDEP, 20 were judged to be due to other causes (non-SUDEP), and 1 lacked sufficient data from which to make a classification. The overall SUDEP rate (definite/highly probable SUDEP and possible SUDEP combined) was calculated to be 3.5 in 1,000 patient-years of exposure to LTG.
Conclusions: The rate of SUDEP in this cohort of patients was comparable to the rate that would be expected in young adults with severe epilepsy (the subgroup of patients believed to be at highest risk of SUDEP). The data suggest that the rate of SUDEP in the LTG clinical development program is a function of the clinical trial population and is unrelated to drug treatment.  相似文献   
997.
The spatial organization of olfactory nerve projections   总被引:1,自引:0,他引:1  
The spatial organization of olfactory nerve projections was examined in the rat. The pathway was traced by orthograde transport of HRP following nasal lavage and by retrograde transport of HRP following injections into the olfactory bulb. The results indicated that there was a broad relationship between the epithelium and the olfactory bulb. Specific regions of the olfactory bulb received input from a large region of the epithelium. However, there was evidence that olfactory nerve terminations were not uniformly dense across their terminal fields. The results suggest that there may be finer sorting of olfactory nerves based on functional specificity.  相似文献   
998.
Pyroglutamyl diazomethyl ketone and N-benzyloxycarbonyl prolyl prolinal, specific inhibitors of pyroglutamyl peptidase I and prolyl endopeptidase respectively, were used to study the possible role of these enzymes in the regulation of thyrotropin releasing hormone turnover. In vitro thyrotropin releasing hormone release by male rat hypothalamic slices was studied. Combined in vitro treatment with 10(-5)M of both inhibitors totally inhibited both enzymatic activities. The treatment did not affect basal or 56 mM K+ induced thyrotropin releasing hormone release or thyrotropin releasing hormone levels in slices. Repeated combined intraperitoneal injections of the two inhibitors for up to 12 hours produced a 70%-95% reduction in mouse brain pyroglutamyl peptidase I specific activity and a 65%-85% reduction in prolyl endopeptidase specific activity. Thyrotropin releasing hormone levels were unaffected by this treatment in all regions tested. The data suggest that these two enzymes are not involved in the intra- or extracellular control of thyrotropin releasing hormone levels in brain or hypophysis.  相似文献   
999.
Examined the effectiveness of specific psychoeducational tutoring methods on achievement in reading, self-esteem, auding, and verbal language. Ss (N = 132) were youths and adults reading below fifth level who volunteered to participate in an adult tutorial project. After the assessment of entry level achievement, Ss received psychoeducational tutoring. Comparison of pre- with posttest scores indicated that Ss made significant improvement in reading, self-esteem, auding, and verbal language. Pretest scores were related most strongly to posttest scores. Initial verbal language scores were related significantly to posttest reading and auding scores. The study also tested the adequacy of a developmental reading model for adult illiterates. Auding and verbal language scores exceeded reading scores, as theorized. Further research is needed to determine whether gains in achievement continue and whether low intellectual levels or specific language disabilities are contributing to the low levels of reading, auding, and verbal language.  相似文献   
1000.
Reported results of a study that compared two projective techniques for a group of 19 transsexuals who were seeking sex reassignment surgery. The Draw-A-Person Test (DAP), widely used in clinical settings, was contrasted to the Animal and Opposite Drawing Technique (AODT), which is a relatively new and little-examined variation of the DAP. Discussion focuses on the use of both measures as predictors of those transsexuals to be recommended for surgery. Use of the AODT as an effective measure in the assessment of transsexualism is investigated.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号