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   169707篇
  免费   33442篇
  国内免费   2542篇
耳鼻咽喉   5404篇
儿科学   5769篇
妇产科学   2584篇
基础医学   5323篇
口腔科学   1844篇
临床医学   27954篇
内科学   52966篇
皮肤病学   7883篇
神经病学   16193篇
特种医学   7145篇
外科学   44884篇
综合类   280篇
现状与发展   72篇
预防医学   7438篇
眼科学   3719篇
药学   2093篇
中国医学   60篇
肿瘤学   14080篇
  2024年   524篇
  2023年   4927篇
  2022年   1486篇
  2021年   3739篇
  2020年   6370篇
  2019年   2598篇
  2018年   7946篇
  2017年   7708篇
  2016年   8944篇
  2015年   8893篇
  2014年   16164篇
  2013年   16421篇
  2012年   6787篇
  2011年   7009篇
  2010年   11171篇
  2009年   14946篇
  2008年   7045篇
  2007年   5354篇
  2006年   7741篇
  2005年   5081篇
  2004年   4405篇
  2003年   3225篇
  2002年   3223篇
  2001年   4018篇
  2000年   3242篇
  1999年   3461篇
  1998年   3884篇
  1997年   3678篇
  1996年   3534篇
  1995年   3358篇
  1994年   2093篇
  1993年   1665篇
  1992年   1486篇
  1991年   1509篇
  1990年   1134篇
  1989年   1266篇
  1988年   1083篇
  1987年   920篇
  1986年   956篇
  1985年   766篇
  1984年   594篇
  1983年   550篇
  1982年   539篇
  1981年   421篇
  1980年   382篇
  1979年   340篇
  1978年   351篇
  1977年   418篇
  1975年   293篇
  1972年   319篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
93.
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   
94.
95.
96.
97.
98.
Potassium, which is abundant in vegetables, is inversely related to blood pressure. Although the situation has changed somewhat in recent years, the Okinawan diet has generally included a large amount of vegetables, and until recently Okinawans had the lowest rates of mortality due to stroke and coronary heart disease in Japan. Based on the hypothesis that these low mortality rates are partly attributable to increased potassium intake resulting from the high vegetable consumption, this study examined whether increasing the consumption of typical yellow-green Okinawan vegetables increases potassium intake. The purpose of this investigation was to determine whether increased consumption of these vegetables should be one of the dietary modifications recommended in public health promotion programs for Okinawans. The study employed 56 healthy, normotensive, free-living Japanese women aged 18-38 years living in Okinawa. They were randomized to a dietary intervention group (n=27) or a control group (n=29). Members of the dietary intervention group received an average weight of 371.4 g/day of a combination of the following vegetables twice weekly through an express home parcel deliver service for a period of 14 days: Goya (Momordica charantia), green papaya (Carica papaya), Handama (Gynura bicolor), Karashina (Brassica juncea), Njana (Crepidiastrum lanceolatium), Fuchiba (Artemisia vulgaris) and Fudanso (Beta vulgaris); and they consumed an average of 144.9 g/day, resulting in a 20.5% increase in their urinary potassium excretion over the baseline (p=0.045). The members of the control group were asked to avoid these vegetables, and the change in potassium excretion in this group was not significant (p=0.595). Urinary sodium and magnesium excretions, systolic and diastolic blood pressures, folic acid, triglycerides and serum high density lipoprotein cholesterol, low density lipoprotein cholesterol and total cholesterols changed non-significantly in both groups. Also, post-intervention urinary potassium excretion correlated positively with vegetable consumption in both the dietary intervention (p<0.0001) and control (p=0.008) groups and with Okinawan vegetable intake in the dietary intervention group (p=0.0004).  相似文献   
99.
100.
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   
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