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   130092篇
  免费   11495篇
  国内免费   7538篇
耳鼻咽喉   1736篇
儿科学   1571篇
妇产科学   1365篇
基础医学   16585篇
口腔科学   2409篇
临床医学   14892篇
内科学   19824篇
皮肤病学   2131篇
神经病学   7008篇
特种医学   6312篇
外国民族医学   42篇
外科学   13529篇
综合类   18118篇
现状与发展   39篇
一般理论   12篇
预防医学   8408篇
眼科学   3589篇
药学   13785篇
  103篇
中国医学   6276篇
肿瘤学   11391篇
  2024年   353篇
  2023年   1786篇
  2022年   4485篇
  2021年   6264篇
  2020年   4496篇
  2019年   4094篇
  2018年   4342篇
  2017年   4014篇
  2016年   4129篇
  2015年   6071篇
  2014年   7349篇
  2013年   7215篇
  2012年   10432篇
  2011年   11157篇
  2010年   7235篇
  2009年   6060篇
  2008年   7687篇
  2007年   7367篇
  2006年   6955篇
  2005年   6280篇
  2004年   4703篇
  2003年   4570篇
  2002年   3830篇
  2001年   2790篇
  2000年   2495篇
  1999年   2373篇
  1998年   1397篇
  1997年   1284篇
  1996年   1051篇
  1995年   960篇
  1994年   881篇
  1993年   555篇
  1992年   735篇
  1991年   626篇
  1990年   563篇
  1989年   503篇
  1988年   392篇
  1987年   379篇
  1986年   298篇
  1985年   217篇
  1984年   136篇
  1983年   106篇
  1982年   64篇
  1981年   61篇
  1980年   48篇
  1979年   53篇
  1978年   27篇
  1976年   36篇
  1974年   29篇
  1973年   28篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
骆驼蓬总碱,氟尿嘧啶对视网膜母细胞瘤细胞系SO...   总被引:7,自引:0,他引:7  
  相似文献   
82.
Summary Thirty-one patients with stage IIIB or IV non-small cell lung cancer (NSCLC) were treated with intravenous 10-EdAM on a weekly basis. The starting dose was 80 mg/m2, with subsequent doses adjusted depending on evidence of toxicity. There were 20 men and 11 women with a median age of 58 years (range, 33–75). Response was evaluated in 30 patients, 5 with evaluable but not measurable tumors and 25 with measurable indicator lesions. There were no complete remissions; 3 patients achieved partial remission. Nine patients had a minor response, 6 showed no change, and 12 had progressive disease. Median survival for all 31 patients was 43 weeks (range, 12–65+). During the first 3-week period, the 10-EdAM dose was reduced or withheld in 19 patients (because of stomatitis in 12, SGPT elevation in 3, skin rash in 2, and granulocytopenia in 2), escalated in 11 patients, and unchanged in 1 patient. A mean of 34–88 mg/m2of 10-EdAM (median, 50) was given per week during the first 5-week period. Myelotoxicity was infrequent and there was no significant nephrotoxicity. Considering the modest side effects of this treatment and the conservative dose-modification schedule which mandated substantial dose reductions, we conclude that 10-EdAM is a promising antitumor agent for NSCLC.  相似文献   
83.
84.
The microcirculatory architecture of normal tissue, transitional mucosa and adenocarcinoma of the human colon was investigated with microvascular corrosion casting (MVCC) combined with scanning electron microscopy (SEM). The study showed that the capillaries within the normal mucosa were arranged in a regular hexagonal pattern around the mucosal glands and that the microvessels of transitional mucosa mostly had lost the typical hexagonal pattern and become slightly wider in diameter. The microvessels in the tumor periphery were increased in number and disorganized, and presented large variation in morphology with claw-like formations, widened sinuses, diverticula and appendixoid patterns. Microvessels were lacking in the central areas of tumors. These morphological alterations may serve as additional indicators of tumor development.  相似文献   
85.
D Yan  Y Jin  X Zhang  J Li  L Shi  Z Chen  X Li  Y Lin 《中医杂志(英文版)》1997,17(4):294-298
The levels of plasma norepinephrine (NE) and epinephrine (E) were determined by HPLC in 220 patients with various TCM liver syndromes, and in 96 healthy subjects as controls. The plasma NE and E contents were higher in patients with liver excess syndromes, including Ganqi Yujie (GQYJ [symbol: see text]) syndrome, Ganyang Shangkang (GYSK [symbol: see text]) syndrome, Ganhuo Shangyan (GHSY [symbol: see text]) syndrome, and Ganyang Huafeng (GYHF [symbol: see text]) syndrome; while they were lower in patients with liver deficiency syndromes, including Ganqixu (GQX [symbol: see text]) syndrome, Ganxuexu (GXX [symbol: see text]) syndrome, and Ganyinxu (GYX [symbol: see text]) syndrome. Futhermore, when Ganshen Yinxu (GSYX [symbol: see text]) syndrome was turned into GYSK and then into GYHF, the plasma NE and E contents increased in order of precedence; while when GQYJ was turned into Ganyu Pixu (GYPX [symbol: see text]) syndrome, both NE and E contents decreased. The results suggest that the plasma NE and E contents are reliable objective parameters for the study of pathophysiological basis of the liver excess and liver deficiency syndromes, and the liver-kidney and liver-spleen interrelated syndromes.  相似文献   
86.
薛安娜  陈孝曙 《卫生研究》1994,23(3):150-152
测定分析不同膳食特点地区975例年龄45~74岁中老年人的血红蛋白及其与膳食营养素的关系。结果牧民及城市居民贫血率低,北京及新疆托里分别为7.6%和4.6%。男性比女性血红蛋白高,血红蛋白随年龄增加而降低。相关分析结果血红蛋白与膳食热能、蛋白质、动物蛋白质与总蛋白质比值呈显著正相关。结果说明血红蛋白可用于中老年人营养状态监测。  相似文献   
87.
Summary The vestibulospinal level of vestibular function is commonly neglected in the evaluation of vertiginous patients. We have now developed a new posture equilibrometer. A transducer is placed on the head of the subject being tested. With this meter we can record body swaying, X (left-right) and Y (fore-aft) components of angular displacement, angular velocity, and angular acceleration. A detailed analysis of the data can be made by having patients keep their eyes either open or closed during the Romberg test. The head is turned left or right in this test, while the eyes are opened and closed in the Mann test. The posture equilibrometer has enabled us to evaluate more precisely vestibulospinal function and sensory interactions. Offprint request to: N. C. Zhong  相似文献   
88.
综合医院心理咨询门诊儿童咨客分析   总被引:6,自引:2,他引:4  
目的;了解综合医院心理咨询门诊儿童咨客的特点。方法:总结中山大学附属三院心理咨询门诊近3年儿童咨客的资料。结果:咨客男女比例为1.96:1,咨客人数随着年龄的增长而增加,女童中13-16岁的比例男童大,5-8岁和9-12岁的比例较男童小。广州市内外的咨客比例为1.38:1,不同年龄儿童咨客的居住地构成是有差异的。最常见的病种是精神分裂症,神经症、精神发育迟滞,儿童多动症,单纯咨询和品行障碍,不同年龄,不同性别的儿童咨客的疾病构成是有差异的。结论:综合医院心理咨询门诊与儿童心理咨询门诊的儿童咨客是有差异的。  相似文献   
89.
目的 采用HPCE法拆分伯胺类药物对映异构体。方法 缓冲液 2 0mmol/LTris 0 .1%H3 PO4(v/v)(pH 2 .0 6 ) +18 冠 6 四甲酸 (18C6H4) ;检测波长 2 10nm。结果  8种伯胺类药物得以拆分。结论 缓冲液中添加手性冠醚的HPCE法能较好地拆分伯胺类药物。  相似文献   
90.
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