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   93143篇
  免费   8858篇
  国内免费   6676篇
耳鼻咽喉   821篇
儿科学   1009篇
妇产科学   958篇
基础医学   10934篇
口腔科学   1813篇
临床医学   12110篇
内科学   13686篇
皮肤病学   974篇
神经病学   4136篇
特种医学   3023篇
外国民族医学   67篇
外科学   9647篇
综合类   16540篇
现状与发展   28篇
一般理论   17篇
预防医学   6842篇
眼科学   2572篇
药学   10001篇
  97篇
中国医学   5446篇
肿瘤学   7956篇
  2024年   396篇
  2023年   1596篇
  2022年   3936篇
  2021年   5160篇
  2020年   3736篇
  2019年   3139篇
  2018年   3231篇
  2017年   2933篇
  2016年   2694篇
  2015年   4318篇
  2014年   5272篇
  2013年   4654篇
  2012年   6676篇
  2011年   7435篇
  2010年   4961篇
  2009年   3981篇
  2008年   4845篇
  2007年   4948篇
  2006年   4780篇
  2005年   4622篇
  2004年   3357篇
  2003年   3158篇
  2002年   2650篇
  2001年   2217篇
  2000年   2098篇
  1999年   2115篇
  1998年   1353篇
  1997年   1313篇
  1996年   982篇
  1995年   998篇
  1994年   877篇
  1993年   500篇
  1992年   584篇
  1991年   560篇
  1990年   523篇
  1989年   427篇
  1988年   352篇
  1987年   318篇
  1986年   255篇
  1985年   206篇
  1984年   134篇
  1983年   76篇
  1982年   48篇
  1981年   48篇
  1980年   21篇
  1979年   41篇
  1977年   17篇
  1975年   14篇
  1974年   19篇
  1969年   13篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
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   
3.
目的用腔内注药法治疗颌骨囊肿代替手术摘除法,不破坏周围正常组织结构,不影响正常生理功能,不遗留疤痕畸形,不影响美容.即使巨大骨囊肿也无须植骨,不遗留骨质缺陷畸形.方法囊腔穿刺冲洗,注入复方磷酸液(Composite Phosphoric,CP液),5~10分钟后冲洗.结果注药后功能及生活无影响;囊腔愈合、骨化;松动牙固定;无感觉运动异常、功能障碍、残留疤痕及缺陷畸形.结论 CP液能使上皮细胞层凝固坏死,使之失去分泌与隔离功能,肉芽组织增生充满囊腔,骨腔骨化,恢复功能.  相似文献   
4.
5.
6.
7.
Fully soluble hemostatic fiber (FHF) is made from cotton yarn through a series of chemical reactions with NaOH and chloroacetic acid. The major component of FHF is carboxymethylcellulose. FHF is a kind of biodegradation macromolecule material that can disassociate into a low-molecular-weight compound or a simple substance by hydrolytic and enzymatic courses. The purpose of the present study is to investigate the hemostatic mechanism of FHF. The study indicated that FHF can stop bleeding by physical, chemical and physiological routes. In the physical route, expansion of carboxymethylcellulose in FHF stops bleeding by forming a mechanical clog after contacting with the blood. In the chemical route, the platelets can quickly aggregate around FHF and stimulate releasing and disaggregating reactions, after contacting with the rough surface of FHF, producing thrombus and hemostasis. In the physiological route, gluey particles with negative charges can activate intrinsic coagulation systems by activating the blood coagulation factor XII after FHF dissolution.  相似文献   
8.
985份病案质量检查分析   总被引:1,自引:0,他引:1  
姚炯  徐哲 《中国病案》2004,5(11):27-27
根据浙江省病历管理质控中心出台的住院病案质量检查评分表,对我院2003年4至12月九个月期间的住院病案随机抽检985份,探讨我院病历书写质量的现状、存在的问题,以及进一步提高病历质量的对策.  相似文献   
9.
Summary The compounds from the root ofRhododendron molle G. Don were isolated, purified by various chromatographic techniques, and their structures were identified according to the physical and chemical features and spectral data. Three compounds were separated from the root ofRhododendron molle G. Don and identified as Rhodojaponin-III,taraxerol, β-sitosterol for the first time. XIANG Yanni, female, born in 1976, Postgraduate student  相似文献   
10.
OBJECTIVE: To evaluate the effect of hyperfractionated radiation therapy and concomitant chemotherapy for inoperable stage III non-small cell lung cancer (NSCLC). METHODS: Seventy patients were randomized equally into two group. The therapy group received radiotherapy with hyperfractionated radiation therapy combined with concomitant chemotherapy, and the control group was treated with chemotherapy only. RESULT: The overall response rate, including the rate of both complete (CR) and partial responses (PR), in the therapy group was 60.0% with a CR rate of 8.6%. The overall response rate in the control group was 40.0% with a CR rate of 5.7%. The difference in overall response rate was statistically significant between the two groups (P<0.05). The median survival time, 1- and 2-years survival rate were 12.8 months, 48.6%, and 25.7%, respectively, in the hyperfractionated radiotherapy group, and 9.4 months, 34.3%, and 17.1%, respectively, in the chemotherapeutic group (P 0.031). The major toxic effects of the chemotherapy were myelosuppression and radiation esophagitis. CONCLUSION: Hyperfractionated radiation therapy plus concomitant chemotherapy with paclitaxel for inoperable stage III NSCLC improves the short-term response of the patients, but fail to raise the survival rate.  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