全文获取类型
收费全文 | 18511篇 |
免费 | 1396篇 |
国内免费 | 42篇 |
专业分类
耳鼻咽喉 | 113篇 |
儿科学 | 559篇 |
妇产科学 | 511篇 |
基础医学 | 2706篇 |
口腔科学 | 344篇 |
临床医学 | 2124篇 |
内科学 | 3647篇 |
皮肤病学 | 326篇 |
神经病学 | 1957篇 |
特种医学 | 597篇 |
外科学 | 1770篇 |
综合类 | 161篇 |
现状与发展 | 1篇 |
一般理论 | 20篇 |
预防医学 | 2013篇 |
眼科学 | 290篇 |
药学 | 1423篇 |
中国医学 | 56篇 |
肿瘤学 | 1331篇 |
出版年
2024年 | 26篇 |
2023年 | 243篇 |
2022年 | 383篇 |
2021年 | 677篇 |
2020年 | 463篇 |
2019年 | 733篇 |
2018年 | 716篇 |
2017年 | 570篇 |
2016年 | 563篇 |
2015年 | 613篇 |
2014年 | 801篇 |
2013年 | 1034篇 |
2012年 | 1648篇 |
2011年 | 1561篇 |
2010年 | 806篇 |
2009年 | 760篇 |
2008年 | 1222篇 |
2007年 | 1232篇 |
2006年 | 1028篇 |
2005年 | 1091篇 |
2004年 | 940篇 |
2003年 | 806篇 |
2002年 | 762篇 |
2001年 | 122篇 |
2000年 | 60篇 |
1999年 | 101篇 |
1998年 | 126篇 |
1997年 | 122篇 |
1996年 | 72篇 |
1995年 | 70篇 |
1994年 | 67篇 |
1993年 | 55篇 |
1992年 | 41篇 |
1991年 | 34篇 |
1990年 | 39篇 |
1989年 | 28篇 |
1988年 | 32篇 |
1987年 | 36篇 |
1986年 | 33篇 |
1985年 | 25篇 |
1984年 | 16篇 |
1983年 | 13篇 |
1982年 | 27篇 |
1981年 | 21篇 |
1980年 | 11篇 |
1979年 | 14篇 |
1978年 | 10篇 |
1977年 | 12篇 |
1976年 | 9篇 |
1975年 | 9篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
43.
Caroline Richmond 《Canadian Medical Association journal》1991,144(4):411-412
44.
D. Caroline Blanchard Jon K. Shepherd R. J. Rodgers Robert J. Blanchard 《Psychopharmacology》1992,106(4):531-539
The Proxemics/Activity test and the Eat/Drink test, two components of the Anxiety/Defense Test Battery, were developed to measure defensive reactions to situations associated with a natural predator (cat). In the present studies the behavioral effects of 8-OH-DPAT treatment (0.01–1.0 mg/kg, SC) were entirely consistent with anxiety/fear reduction. These effects included an increase in time spent near the cat compartment, and a complimentary decrease in time spent farthest from this compartment, together with an increase in transits and locomote behavior. 8-OH-DPAT (1.0 mg/kg) also increased eat frequencies and durations (highly preferred food) both during and following cat presentation, without influencing drinking. This finding is discussed with reference to previous findings with 8-OH-DPAT in studies assessing both food intake and anxiolysis. Interestingly, 8-OH-DPAT was more potent in a majority of its effects in female subjects, a finding consistent with recent neurochemical data. These findings provide important behavioral evidence for a sexual differentiation in 5-HT function, and support the case for greater emphasis on female subjects in animal models of anxiety.Supported by NIH MH42803 and RCMI Grants RR03061 and RR01825 相似文献
45.
QuickVue Influenza Test for Rapid Detection of Influenza A and B Viruses in a Pediatric Population 下载免费PDF全文
Caroline Quach Diane Newby Ghislaine Daoust Earl Rubin Jane McDonald 《Clinical and Vaccine Immunology : CVI》2002,9(4):925-926
The performance of a lateral-flow immunoassay, the QuickVue Influenza Test, for detection of influenza A and B viruses in comparison with that of cell culture was evaluated by using nasopharyngeal aspirates, in viral transport medium, from children with respiratory tract infections. The sensitivity and specificity were 79.2 and 82.6%, respectively. 相似文献
46.
47.
This article highlights positive outcomes for a convenience sample of six women (49-64 years of age) with fibromyalgia syndrome (FMS) who participated in an exercise program over 5 years. This group showed improvement with various FMS symptoms,fitness, and psychosocial factors early in the program, then showed further improvement as a result of adding new exercises to the protocol during the fourth and fifth years. Data suggest that certain people with FMS can improve their functional capacity with exercise over time, and move to even higher levels of physical function while aging and coping with FMS. Practical advice is provided for rehabilitation nurses regarding exercise and FMS. 相似文献
48.
Caroline Schmitt Gurwattan S Miranpuri Vinay K Dhodda Jason Isaacson Raghu Vemuganti Daniel K Resnick 《The spine journal》2006,6(2):113-119
BACKGROUND AND CONTEXT: The functional recovery of animals subject to experimental spinal cord injury (SCI) is dependent on the injury model as well as the species and strain of animal used. Previous studies have shown differences in rates and degree of recovery between rats of different strains. PURPOSE: We sought to explore the hypothesis that differences in gene expression are associated with differences in functional recovery. STUDY DESIGN/SETTING: Laboratory study involving cohorts of three different strains of rat. METHODS: We used the Impactor device to produce identical spinal cord contusion injuries in groups of Long Evans, Sprague-Dawley, and Lewis rats (10 each). The functional recovery of animals was assessed using the Basso, Beattie, and Bresnahan rating scale. Six weeks after injury, rats were killed and the spinal cords were harvested for deoxyribonucleic acid microarray analysis. Changes in gene expression compared with intraspecies controls (3 each) were assessed at the region of injury and at a rostral segment of the spinal cord. Selected genes were also studied with real-time polymerase chain reaction. RESULTS: We found that different strains tended to exhibit different patterns of functional recovery. There were differences between the strains in terms of gene expression. CONCLUSIONS: These results emphasize the importance of testing novel therapies for SCI in a variety of animal species before introduction into human trials. Further research into the influence of several gene products on functional recovery is needed. 相似文献
49.
M Cecilia Lansang Caroline Coletti Sofia Ahmed Michael S Gordon Norman K Hollenberg 《Journal of the renin-angiotensin-aldosterone system》2006,7(3):175-180
BACKGROUND: Thiazolidinediones (TZD) have been reported to improve early stages of diabetic nephropathy independent of glycaemic control. Since blockade of the renin-angiotensin system (RAS) is known to reduce the risk of nephropathy, we hypothesised that the renal effect of TZDs might be related to a favourable effect on the intrarenal RAS. We aimed to determine if the TZD rosiglitazone could reduce RAS activation. METHODS: We studied adult type 2 diabetic patients and placed them on rosiglitazone for three months. We have previously used the renal haemodynamic response to angiotensin-converting enzyme (ACE) inhibition to demonstrate the state of RAS activation, and thus measured renal plasma flow (RPF) and glomerular filtration rate (GFR) before and after administration of captopril at 0 month and at three months. Plasma renin activity (PRA), active renin, aldosterone and natriuretic peptides were analysed. RESULTS: The RPF response to ACE inhibition was not altered. There was no change in GFR, PRA, active renin and aldosterone levels. Two patients developed oedema one had an elevated baseline active renin and another had an elevated baseline aldosterone level. CONCLUSION: The favourable effects of TZDs on diabetic nephropathy is likely not related to an influence on the RAS. 相似文献
50.
Orlando Parise Franois Janot Bernard Luboinski Liliane Massaad Nicolas Albin Caroline Toussaint Marie-Ange Verjus Marc Bonnay Alain Gouyette Guy G. Chabot 《Head & neck》1994,16(2):158-164
Background. Head and neck squamous cell carcinomas (HNSCC) present variable aggressiveness and chemosensitivity. Because the glutathione (GSH) system and thymidylate synthase (TS) are involved in the resistance to the main drugs used in HNSCC (cisplatin and 5-FU), we studied these systems in tumors and normal mucosae. Methods. Tumor samples and normal adjacent mucosae were collected from 37 untreated HNSCC patients. GSH and glutathione S-transferase (GST) activity were assayed by spectrophotometry, whereas TS activity and folates were determined by radioassays. Results. Mean GSH levels were higher in tumors (15.2 ± 8.2 nmol/mg protein) than in mucosae (8.3 ± 4.1 nmol/mg protein) (p = 0.005, paired t test). GST activity was also higher in tumors (394 ± 194 nmol/min/mg protein) than in mucosae (261 ± 132 nmol/min/mg protein) (p = 0.0003). TS activity was markedly higher in tumors (9.2 ± 21.5 pmol/min/mg protein) compared to that of mucosae (0.9 ± 1.2 pmol/min/mg protein) (p = 0.0001). Folate levels in tumors and mucosae were similar (1.2 ± 1.1 and 0.8 ± 0.9 pmol/mg protein, respectively; p = 0.1, NS). In relation to clinical stage and tumor size, a statistical difference was found in GSH and GST values between tumors and mucosae for stage IV and T3/T4. The increase in tumor TS compared to that of mucosae was significant for all clinical stages, tumor sizes, and nodal involvement. Conclusions. These data enhance our understanding of the enzymatic systems involved in cisplatin and 5-fluorouracil (5-FU) resistance in HNSCC and normal mucosae and may help to elucidate tumor behavior and interpatient differences in drug sensitivity. © 1994 John Wiley & Sons, Inc. 相似文献