全文获取类型
收费全文 | 65116篇 |
免费 | 5932篇 |
国内免费 | 3377篇 |
专业分类
耳鼻咽喉 | 568篇 |
儿科学 | 1059篇 |
妇产科学 | 896篇 |
基础医学 | 8359篇 |
口腔科学 | 1635篇 |
临床医学 | 7173篇 |
内科学 | 10830篇 |
皮肤病学 | 896篇 |
神经病学 | 4002篇 |
特种医学 | 2275篇 |
外国民族医学 | 17篇 |
外科学 | 7720篇 |
综合类 | 8411篇 |
现状与发展 | 7篇 |
一般理论 | 10篇 |
预防医学 | 4348篇 |
眼科学 | 1682篇 |
药学 | 6788篇 |
24篇 | |
中国医学 | 2488篇 |
肿瘤学 | 5237篇 |
出版年
2024年 | 167篇 |
2023年 | 708篇 |
2022年 | 1744篇 |
2021年 | 2324篇 |
2020年 | 1734篇 |
2019年 | 1566篇 |
2018年 | 1902篇 |
2017年 | 1739篇 |
2016年 | 1617篇 |
2015年 | 2277篇 |
2014年 | 2874篇 |
2013年 | 2943篇 |
2012年 | 4085篇 |
2011年 | 4214篇 |
2010年 | 2834篇 |
2009年 | 2316篇 |
2008年 | 3147篇 |
2007年 | 3124篇 |
2006年 | 2934篇 |
2005年 | 2404篇 |
2004年 | 1997篇 |
2003年 | 1757篇 |
2002年 | 1516篇 |
2001年 | 2922篇 |
2000年 | 2804篇 |
1999年 | 2407篇 |
1998年 | 1082篇 |
1997年 | 846篇 |
1996年 | 663篇 |
1995年 | 610篇 |
1994年 | 539篇 |
1993年 | 394篇 |
1992年 | 1198篇 |
1991年 | 1046篇 |
1990年 | 903篇 |
1989年 | 979篇 |
1988年 | 904篇 |
1987年 | 841篇 |
1986年 | 770篇 |
1985年 | 666篇 |
1984年 | 403篇 |
1983年 | 338篇 |
1982年 | 189篇 |
1981年 | 153篇 |
1980年 | 124篇 |
1979年 | 210篇 |
1978年 | 85篇 |
1973年 | 93篇 |
1972年 | 93篇 |
1971年 | 94篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
92.
Li Ming Yang Jing Shen Guan-xin Zhang Qian Liu Shen-pei Liu Zhong-bei Ye Wei-xin 《华中科技大学学报(医学英德文版)》1994,14(4):209-212
Summary T cell activation and proliferation via CD3-TCR complex were investigated by lymphocyte DNA synthesis in vitro. Several interfering factors were also discussed. The
result indicated that lymphocyte activation and proliferation are calciumdependent. A rise of cytoplasmic free Ca2+ quickly following activation with CD3 McAb is mainly due to intracellular mobilization of Ca2+, while lymphocyte proliferation needs both intracellular mobilization of Ca2+ as well as influx of extracellular Ca2+. It was confirmed that CTX sensitive G protein plays a role in regulating T cell proliferation by pretreatment with CTX suppressing
lymphocyte3H-TdR incorporation obviously. PLC and PKC inhibitor neomycin and P. S. S could also decrease T cell proliferation. 相似文献
93.
M Hettiarachchi E Q Colquhoun J M Ye S Rattigan M G Clark 《International journal of obesity (2005)》1991,15(1):37-43
d,l-Norephedrine (phenylpropanolamine) which is both a demethylated analogue and a metabolite of d,l-ephedrine, is a reputed anorectic agent. In the present study the proposed most active isomer of this mixture, l-norephedrine has been assessed as a peripherally acting thermogenic agent in the isolated perfused rat hindlimb. l-Norephedrine produced a dose-dependent increase in oxygen uptake and perfusion pressure and increased lactate production. Whereas propranolol potentiated the increase in oxygen uptake and perfusion pressure produced by l-norephedrine, prazosin significantly and nitroprusside totally inhibited both of these changes. Nitroprusside also completely inhibited the increase in lactate production. We conclude that norephedrine has a hitherto unrecognized peripheral thermogenic activity in the perfused rat hindlimb resulting from its interaction with alpha 1 adrenergic receptors that control vasoconstriction in this tissue. 相似文献
94.
Through a critical study of herbalogy, it is concluded that the mature seeds of Alpinia zermubet were used as caodoukou in ancient times. The original plant of Yutao recorded in Zhiwu Mingshi Tukao may be the species of Alpinia katsumadai. Baidukou used in ancient times may be the seeds of Alpinia katsumadai found in the south of China, or Amomum compactum and Am. kravanh imported from foreign countries. 相似文献
95.
H S al-Rimawi A A al-Rashied K C Aboo-Backer Q A al-Saleh M F Jallad S Malik 《Annals of tropical paediatrics》1991,11(3):301-303
We report two successful pregnancies in a 17-year-old Arab girl who had received modern combination chemotherapy and central nervous system minimal disease therapy for childhood acute lymphoblastic leukaemia at the age of 9.5 years. 相似文献
96.
S P Brown E R Anderson Q He S Liu Q Wu H Li R Whittle 《The Journal of sports medicine and physical fitness》1992,32(3):288-292
To compare the oxygen cost of submaximal exercise on the Stairobic stepping (SS) machine with bench stepping (BS), 12 healthy men and women (mean age 23 years) underwent six different five minute exercise bouts that were randomly assigned. Tests were conducted using standard open circuit calorimetry. SS at 40 and 60 st/min was equal to BS at 20 st/min and SS at 80 st/min was equal to BS at 30 st/min for VE and RER. VO2 was equal at 20 st/min (BS) and 60 st/min (SS), and 30 st/min (BS) and 80 st/min (SS). Stairobic MET (SM) displayed values over-estimated actual MET (AM) values at the two lowest SS rates and under-estimated the AM value at the highest SS rate. Forty-eight observations of the MET response of SS were conducted and analyzed (BMDP2R) in a forward stepping solution. The multiple regression equation calculated for AM was: AM = -0.567 + -0.012 (WT) + 0.063 (rate) + 0.612 (SM) with an adjusted R2 of 0.82 and a SEE of 0.90. The physiologic cost of BS was approximately equal to SS at two to three times the BS rate of stepping. 相似文献
97.
Clinical evaluation of technetium-99m infecton for the localisation of bacterial infection 总被引:4,自引:3,他引:1
K. E. Britton S. Vinjamuri A. V. Hall K. Solanki Q. H. Siraj J. Bomanji S. Das 《European journal of nuclear medicine and molecular imaging》1997,24(5):553-556
The aim of the study was to distinguish infection from inflammation in patients with suspected infection using technetium-99m Infecton. Ninety-nine patients (102 studies) referred for infection evaluation underwent imaging with 400 MBq99mTc-Infecton at 1 and 4 h. Most patients had appropriate microbiological tests and about half (56) had radiolabelled white cell scans as well. No adverse effects were noted in any patient. The clinical efficacy of99mTc-Infecton depended in part on whether imaging was undertaken during intibiotic therapy for infection or not. In consultation with the microbiologist, 5–14 days of appropriate and successful antibiotic therapy was considered adequate to classify some results as true-negatives. The figures for sensitivity and specificity of99mTc-Infecton for active or unsuccessfully treated infection were 83% and 91% respectively. It is concluded that99mTc-Infecton imaging contributed to the differential diagnosis of inflammation. It is being used as the first imaging modality when bacterial infection is suspected. 相似文献
98.
99.
报道福建某盐场从事日晒海盐生产人工机体内高镁对心血管系统的影响,通过现场空气、饮水、主良的镁含量测定,并对进入机体途径进行分析,得出空气、卤水接触、饮水为机体镁增高的主要来源。不同对象头发镁含量测定结果显示,以接触卤水、劳动强度大的盐工最高,并随机体内镁含量增高,出现血压偏低、心率减慢、心电图P-R间期延长、QRS波增宽、T波高尖等机体高镁反应,与临床高镁血症相似。 相似文献
100.
140 patients with brain tumor were treated by CT-guided stereotactic injections of radionuclides, such as Aurum-198 (198 Au), Phosphorus-32 (32 P) and Yttrium-90 (90Y). Of these patients aged from 3 to 67 years (average 37), 64 were male and 76 female. Astrocytoma was found in 75 patients, craniopharyngioma in 46, metastatic carcinoma in 7, meningioma in 5, germinoma in 4 and pituitary adenoma in 3. The tumors were located in the deep part or functionally critical area of the brain. After 267 times of injection of colloidal isotopes, no major adverse effects or complications occurred. Follow-up for 6 to 48 months showed improvement in symptoms in 104 (74.3%) patients and CT scanning showed the diminished tumors.
相似文献