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   151149篇
  免费   30997篇
  国内免费   2392篇
耳鼻咽喉   5174篇
儿科学   5397篇
妇产科学   2410篇
基础医学   3124篇
口腔科学   1690篇
临床医学   26617篇
内科学   47155篇
皮肤病学   7431篇
神经病学   14870篇
特种医学   6344篇
外科学   40890篇
综合类   229篇
现状与发展   72篇
一般理论   3篇
预防医学   7118篇
眼科学   3337篇
药学   1024篇
中国医学   25篇
肿瘤学   11628篇
  2024年   684篇
  2023年   4802篇
  2022年   1212篇
  2021年   3102篇
  2020年   6047篇
  2019年   2182篇
  2018年   7404篇
  2017年   7360篇
  2016年   8425篇
  2015年   8405篇
  2014年   15511篇
  2013年   15616篇
  2012年   5474篇
  2011年   5492篇
  2010年   10357篇
  2009年   14250篇
  2008年   5785篇
  2007年   3998篇
  2006年   6443篇
  2005年   3717篇
  2004年   2985篇
  2003年   1949篇
  2002年   2025篇
  2001年   3802篇
  2000年   3009篇
  1999年   3217篇
  1998年   3633篇
  1997年   3453篇
  1996年   3356篇
  1995年   3208篇
  1994年   1940篇
  1993年   1566篇
  1992年   1379篇
  1991年   1412篇
  1990年   1055篇
  1989年   1186篇
  1988年   1016篇
  1987年   856篇
  1986年   894篇
  1985年   721篇
  1984年   552篇
  1983年   524篇
  1982年   517篇
  1981年   403篇
  1980年   361篇
  1979年   309篇
  1978年   334篇
  1977年   398篇
  1975年   278篇
  1972年   303篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.

Background

We have recently shown that human epididymis protein 4 (HE4) levels correlate with the severity of cystic fibrosis (CF) lung disease. However, there are no data on how HE4 levels alter in patients receiving CFTR modulating therapy.

Methods

In this retrospective clinical study, 3 independent CF patient cohorts (US-American: 29, Australian: 12 and Irish: 19 cases) were enrolled carrying at least one Class III CFTR CF-causing mutation (p.Gly551Asp) and being treated with CFTR potentiator ivacaftor. Plasma HE4 was measured by immunoassay before treatment (baseline) and 1–6?months after commencement of ivacaftor, and were correlated with FEV1 (% predicted), sweat chloride, C-reactive protein (CRP) and body mass index (BMI).

Results

After 1?month of therapy, HE4 levels were significantly lower than at baseline and remained decreased up to 6?months. A significant inverse correlation between absolute and delta values of HE4 and FEV1 (r?=??0.5376; P?<?.001 and r?=??0.3285; P?<?.001), was retrospectively observed in pooled groups, including an independent association of HE4 with FEV1 by multiple regression analysis (β?=??0.57, P?=?.019). Substantial area under the receiver operating characteristic curve (ROC-AUC) value was determined for HE4 when 7% mean change of FEV1 (0.722 [95% CI 0.581–0.863]; P?=?.029) were used as classifier, especially in the first 2?months of treatment (0.806 [95% CI 0.665–0.947]; P?<?.001).

Conclusions

This study shows that plasma HE4 levels inversely correlate with lung function improvement in CF patients receiving ivacaftor. Overall, this potential biomarker may be of value for routine clinical and laboratory follow-up of CFTR modulating therapy.  相似文献   
43.
Gorlin syndrome (naevoid basal cell carcinoma syndrome) is a genetically linked disorder characterized by the development of multiple basal cell carcinomas (BCCs) throughout life. Cumulative surgery, cryotherapy and other conventional interventions can result in significant disfigurement by middle age. Radiotherapy is contra-indicated because the mutated gene underlying the syndrome, ‘PTCH’, increases sensitivity to ionising radiation, so there is significant likelihood of inducing further tumours in and around the irradiated area. Photodynamic therapy offers a non-invasive treatment option for patients with this condition, with the added advantage of causing minimal scarring.  相似文献   
44.
45.
46.
47.
48.
Although psychoanalysis was the first-choice treatment for premature ejaculation (PE) between 1920 and 1960, hardly any reports on its efficacy have been published. Moreover, a scientific debate about its findings has never been fully developed. The recent progress that has been made in the classification of three different PE syndromes creates a new opportunity for psychoanalytic investigations of men with complaints of PE, distinguished by the actual duration of their intravaginal ejaculation latency time (IELT). The term premature-like ejaculatory dysfunction has been introduced to distinguish men with self-perceived PE at normal and long IELT durations from those men with lifelong, acquired and normal variable PE. Psychoanalytic research may contribute to a better understanding of the consequences of objective early ejaculations on the unconscious mental life of men with the four forms of PE. By integrating neurobiological, clinical and epidemiological data of ejaculatory performance, a revival of psychoanalytic research of PE in the four distinct, classified PE groups, will probably contribute to a deeper insight in to the unconscious mental life of men affected by PE.  相似文献   
49.
50.
Fibromyalgia is a syndrome of widespread pain, nonrestorative sleep, disturbed mood, and fatigue. Optimal treatment involves a multidisciplinary approach with a team of health care providers using pharmacologic and nonpharmacologic treatment. Because of the heterogeneity of the illness, management should be individualized for the patient. Pharmacologic treatment should address issues of pain control, sleep disturbance, fatigue, and any underlying coexisting mood disorder. Nonpharmacologic treatment should include patient education, a regular exercise and stretching program, and cognitive behavioral therapy. All of these are essential to improving functional capacity and quality of life. This review provides general guidelines in initiating a successful pharmacologic treatment program for patients with fibromyalgia.  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