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   32174篇
  免费   2043篇
  国内免费   164篇
耳鼻咽喉   90篇
儿科学   1590篇
妇产科学   655篇
基础医学   2557篇
口腔科学   125篇
临床医学   2928篇
内科学   8875篇
皮肤病学   507篇
神经病学   2091篇
特种医学   253篇
外科学   3077篇
综合类   1110篇
现状与发展   1篇
一般理论   6篇
预防医学   6019篇
眼科学   971篇
药学   1217篇
  2篇
中国医学   62篇
肿瘤学   2245篇
  2024年   45篇
  2023年   265篇
  2022年   243篇
  2021年   371篇
  2020年   359篇
  2019年   141篇
  2018年   493篇
  2017年   511篇
  2016年   582篇
  2015年   580篇
  2014年   487篇
  2013年   773篇
  2012年   2265篇
  2011年   3335篇
  2010年   1185篇
  2009年   967篇
  2008年   2881篇
  2007年   2739篇
  2006年   2410篇
  2005年   2497篇
  2004年   2787篇
  2003年   2793篇
  2002年   2138篇
  2001年   1556篇
  2000年   505篇
  1999年   262篇
  1998年   229篇
  1997年   136篇
  1996年   109篇
  1995年   63篇
  1994年   116篇
  1993年   57篇
  1992年   64篇
  1991年   47篇
  1990年   45篇
  1989年   46篇
  1988年   42篇
  1987年   44篇
  1986年   44篇
  1985年   29篇
  1984年   25篇
  1983年   14篇
  1982年   19篇
  1981年   20篇
  1980年   14篇
  1979年   7篇
  1978年   6篇
  1975年   5篇
  1974年   4篇
  1970年   6篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
12.
肺结核病人健康教育现状调查与影响因素分析   总被引:23,自引:1,他引:22  
成诗明  杜昕  徐敏 《中国健康教育》2004,20(10):873-876
目的 调查活动性肺结核病人在诊断前接受结核病知识的教育现状 ,分析病人接受结核病知识与社会经济因素的影响。方法 对 2 0 0 0年全国结核病流行病学抽样调查中的 1 2 78名活动性肺结核病人进行社会经济个案调查 ,调查以问卷的形式进行。结果  1 2 78例肺结核病人在诊断前有 5 1 4例接受过不同形式的健康教育 ,占 40 2 % ,男性接受健康教育比例为 41 8% ,女性为 3 6 9%。各年龄组接受健康教育比例 <1 5岁组最低为2 5 9% ,其次是 65~年龄组为 3 0 9%。随着病人文化程度的增高和家庭人均年收入的增高 ,接受健康教育比例增高。肺结核病人各种职业的分类中 ,无工作者接受健康教育比例最低为 3 5 5 % ,其次为农林牧渔劳动者。按照病人是否有症状、有症状后是否就诊及最后诊断为肺结核病人的 3个过程接受不同形式的健康教育的频率 ,均以广播电视、健康教育和亲友教育为主。结论 在开展健康教育活动中 ,应注意对儿童和老年人群 ,对于文化程度低、家庭经济收入低、无工作者和农林牧渔劳动者等重点人群的教育  相似文献   
13.
Although several studies have demonstrated the efficacy of subcutaneous immunotherapy in allergic asthma, few have shown the same benefit using sublingual immunotherapy (SLIT) in asthmatic patients. This study was conducted to assess the efficacy of house dust mite (HDM) SLIT in addition to allergen avoidance and standard pharmacologic treatment. A double-blind, placebo-controlled trial was performed in 111 children (aged 5-15 yr) with HDM-induced mild-to-moderate asthma. After a 4-week baseline phase, patients were randomly assigned to receive SLIT with tablets of HDM extract (n = 55) or placebo (n = 56) for 18 months. Pharmacologic treatment was adjusted every 3 months following a step-down approach. Asthma symptom scores, reduction in use of inhaled corticosteroids and inhaled beta(2)-agonists, rhinitis symptoms, lung function tests, skin sensitivity to HDM, dust mite-specific immunoglobulin (Ig) E and IgG(4), and quality of life (QoL) were assessed during the study. After 18 months of treatment, diurnal and nocturnal asthma symptoms scores did not show significant differences between SLIT and placebo groups. Inhaled corticosteroids and inhaled beta(2)-agonists use was reduced in both groups without significant differences between groups. There were no significant differences in lung function (forced expiratory volume in 1 s and peak flow rate variations) between groups. Rhinitis symptom score decreased in both groups, with no difference between the two groups. The severity dimension of QoL was significantly improved in the SLIT group (age 6-12 yr). SLIT induced a significant reduction of skin sensitivity to HDM (p < 0.01) and a significant increase in HDM-specific IgE and IgG(4) antibodies (p < 0.001) in the SLIT group compared with the placebo group. SLIT was well tolerated with mild/moderate local adverse events. No severe systemic reactions were reported. This study indicates that, when mild-moderate asthmatic children are optimally controlled by pharmacologic treatment and HDM avoidance, SLIT does not provide additional benefit, despite a significant reduction in allergic response to HDM. Under such conditions, only a complete, but ethically unfeasible, discontinuation of inhaled corticosteroid would have demonstrated a possible benefit of SLIT.  相似文献   
14.
Abstract: In order to evaluate the level of evidence of factors influencing the survival of reconstructions, systematic reviews of the relevant literature were prepared by a group of rapporteurs. The review papers were circulated to the members of the group before the conference and formed the basis for group and panel discussions. Subsequently, modifications were added to the review papers, and suggestions for consensus statements concerning the following topics were prepared and again critically reviewed in the group and in the plenum: Impact of (i) periodontal disease on the survival of tooth-supported reconstructions, (ii) post-surgical factors as supportive therapy on the survival of implant supported reconstructions, (iii) technical and/or biological complications on the survival of different types of reconstructions, (iiii) material choice for reconstructions on the survival of single crowns and fixed dental prostheses.  相似文献   
15.
A case-control study to evaluate the efficacy of lung cancer screening conducted by us showed that lung cancer screening may reduce the mortality of the disease up to 28%. Assuming this efficacy is unbiased, and that the screening rate is 51.6%, which was observed in the control group in the above study, the number of lung cancer deaths prevented by screening in the study period was calculated to be 47 for males and females combined. In the same study population, screen-detected lung cancer patients (N = 207) in the same study period were followed and the 7-year survival rate (46.9%) was compared to the 5-year survival rate (11.3%) obtained by the Osaka Cancer Registry, in which screen-detected lung cancer patients were only 1.8%. The number of lung cancer deaths prevented by screening, estimated by the difference in the above two survival rates, was 74 (95% confidence interval; 55–93). The number of lung cancer deaths prevented by screening estimated from the case-control study was significantly lower than that estimated from the survival analysis. This indicates that the efficacy of lung cancer screening estimated by the case-control study was within the range that could be explained by the actual long-term survivors among the screen-detected patients in the study population.  相似文献   
16.
This open multicenter study was performed in 20 hospital gynecological units in the UK. The effects of 600 mg oral mifepristone as pretreatment to vaginal prostaglandin induction of second second trimester abortion was studied in 267 women.

The primary efficacy variable was the abortion induction interval, defined as the time taken to expel the fetus from the time of administration of the first prostaglandin pessary. Induction was commenced 36 to 48 hours following mifepristone intake.

The mean abortion induction interval was 7 h. A total of 81.9% of women aborted within 12 h. There was a significant relationship between abortion induction interval and age of gestation, and a significant inverse relationship between abortion induction interval and parity.

Vomiting, pelvic pain, and nausea were the most frequently reported adverse events. Two patients required transfusion and one patient with a uterine scar from a previous cesarean section suffered a ruptured uterus and hysterotomy.  相似文献   

17.
Endocrine tumor of the pancreas is potentially malignant. A multicenter analysis of these tumors was conducted to clarity the present status of their surgical management and the subsequent long-term surgical results. The Japan pancreatoduodenectomy (JPD) study group carried out the study; 368 patients were enrolled and variables related to tumor characteristics, surgery, and survival were retrospectively analyzed. There were 222 patients with functioning tumor and 143 patients with nonfunctioning tumor. Malignant tumor was found in 140 of 368 (38%) of the patients, and 63/140 (45%) of these patients had metastatic lesion; the most common site of the metastasis was liver 34/136 (25%), followed by regional lymph nodes 26/136 (19%). Pancreatic resection was performed in 91% of patients with nonfunctional tumor and in 83% of those with malignant tumor, and 73% of the pancreatic resections were done with lymph node dissection. The overall 5-year actuarial survival rate was 76% in patients with malignant tumor. The actuarial 5-year survival rate was 93% in the patients without metastasis and 83% in patients who received curative resection. Multivariate analysis showed that the presence or absence of synchronous metastasis was the sole significant prognostic factor. The results suggest that: (i) malignant endocrine tumor of the pancreas is a curable malignancy when pancreatic resection with lymph node dissection is adopted and (ii) that synchronous metastasis is the dominant prognostic factor. This study was carried out as a group project. The authors' institutions are as follows  相似文献   
18.
中国18城市新生儿死因研究   总被引:19,自引:2,他引:17  
我们于1988年5月~1989年4月对我国18城市19所医院住院分娩的60960例活产婴进行了前瞻性调查研究.60960例中死亡556例,总死亡率9.12‰,其中死亡率男高于女,早产、低体重儿高于过期产儿和足月、正常体重儿,三胎和双胎高于单胎.前6位死因依次为窒息(或羊水胎粪吸入)、呼吸系统疾病、感染、畸形、颅内出血和硬肿症.并对各种死因在不同孕周、体重以及不同日龄组中的分布特点及主要防治对策进行了分析讨论.  相似文献   
19.
20.
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