全文获取类型
收费全文 | 40589篇 |
免费 | 3056篇 |
国内免费 | 153篇 |
专业分类
耳鼻咽喉 | 486篇 |
儿科学 | 1011篇 |
妇产科学 | 767篇 |
基础医学 | 5537篇 |
口腔科学 | 786篇 |
临床医学 | 3907篇 |
内科学 | 9075篇 |
皮肤病学 | 441篇 |
神经病学 | 4036篇 |
特种医学 | 1322篇 |
外科学 | 6153篇 |
综合类 | 625篇 |
一般理论 | 36篇 |
预防医学 | 3391篇 |
眼科学 | 1007篇 |
药学 | 2526篇 |
1篇 | |
中国医学 | 82篇 |
肿瘤学 | 2609篇 |
出版年
2023年 | 256篇 |
2022年 | 521篇 |
2021年 | 1083篇 |
2020年 | 580篇 |
2019年 | 933篇 |
2018年 | 1080篇 |
2017年 | 745篇 |
2016年 | 782篇 |
2015年 | 1001篇 |
2014年 | 1284篇 |
2013年 | 1851篇 |
2012年 | 2657篇 |
2011年 | 2732篇 |
2010年 | 1506篇 |
2009年 | 1356篇 |
2008年 | 2327篇 |
2007年 | 2510篇 |
2006年 | 2523篇 |
2005年 | 2477篇 |
2004年 | 2263篇 |
2003年 | 2095篇 |
2002年 | 2070篇 |
2001年 | 374篇 |
2000年 | 341篇 |
1999年 | 416篇 |
1998年 | 414篇 |
1997年 | 408篇 |
1996年 | 312篇 |
1995年 | 300篇 |
1994年 | 284篇 |
1993年 | 284篇 |
1992年 | 253篇 |
1991年 | 226篇 |
1990年 | 241篇 |
1989年 | 229篇 |
1988年 | 272篇 |
1987年 | 228篇 |
1986年 | 215篇 |
1985年 | 230篇 |
1984年 | 253篇 |
1983年 | 263篇 |
1982年 | 282篇 |
1981年 | 272篇 |
1980年 | 309篇 |
1979年 | 158篇 |
1978年 | 169篇 |
1977年 | 167篇 |
1976年 | 148篇 |
1975年 | 118篇 |
1974年 | 140篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Samuel B Adams Paul R Herz Debra L Stamper Mark J Roberts Stephane Bourquin Nirlep A Patel Karl Schneider Scott D Martin Sonya Shortkroff James G Fujimoto Mark E Brezinski 《Journal of orthopaedic research》2006,24(4):708-715
The objective of this study was to develop and verify a new technique for monitoring the progression of osteoarthritis (OA) by combining a rat model with the imaging modality optical coherence tomography (OCT). Time-sequential, in vivo, OCT imaging was performed on the left femoral condyles of 12 Wistar rats following sodium-iodoacetic acid-induced OA progression. The right femoral condyles (untreated) were also imaged and served as controls. Imaging was performed on days 0, 10, 20, 30, and 60 with an OCT system capable of acquiring images at four frames per second and an axial resolution of 5 microm. Progressive changes were analyzed using an OA scoring system. OCT successfully identified progressive cartilage degeneration as well as alteration of the cartilage/bone interface. Significant changes to both of these structures were observed in the sodium-iodoacetic acid-injected condyles. Structural changes detected with OCT were confirmed histologically. OCT in combination with a well-known model used in arthritis research represents a powerful tool for following degenerative joint disease progression in a given animal by detecting changes to the cartilage/bone interface and articular cartilage. 相似文献
92.
Rosen Raymond C. Kostis John B. Jekelis Albert Taska Lynn S. 《Archives of sexual behavior》1994,23(2):135-152
Antihypertensive drugs are commonly associated with adverse side effects in both clinical and laboratory studies. We investigated the sexual sequelae of several major classes of antihypertensive drugs (e.g., beta blockers, central alpha agonists, diuretics) in normal males and in hypertensive patients. We compared the effects of four widely used agents (methyldopa, propranolol, atenolol, hydrochlorothiazide-triamterene) and placebo, in a selected sample of 21 sexually dysfunctional male hypertensives, 13 of whom completed all five phases of the study. Each study drug was administered for a 1-month treatment period, followed by a 2-week, single-blind washout phase, according to a randomized, Latin square crossover design. Dependent variables for the study included a broad range of hormonal, NPT, and self-report measures of sexual response. Results indicated a lack of consistent drug effects on measures of sexual response, although more frequent sexual and nonsexual side effects were observed with methyldopa and propranolol. As in our previous studies, age was negatively correlated with both hormonal and NPT measures, whereas changes in blood pressure were not significantly related to sexual function scores. Results do not support the hypothesis that sexually dysfunctional males are at greater risk for adverse sexual sequelae when treated with centrally active agents or diuretics. 相似文献
93.
94.
Stephen D. Scoggin M.D. Richard C. Frazee M.D. Samuel K. Snyder M.D. John C. Hendricks M.D. John W. Roberts M.D. Richard E. Symmonds M.D. Randall W. Smith M.D. 《Diseases of the colon and rectum》1993,36(8):747-750
The use of laparoscopic surgical techniques is now being applied to a variety of operations traditionally performed in an open fashion. Twenty patients underwent laparoscopic-guided large and small bowel surgery at our institution from March 1991 to April 1992. The indications for surgery included polyps, obstruction, bleeding, and perforation, and pathologic diagnoses included benign polyps, lipomas, inflammatory bowel disease, perforation of a jejunal diverticulum, colonic arteriovenous malformations, and adenocarcinoma. Mobilization of the colon, ligation of the mesentery, and closure of the mesenteric defect were performed using the laparoscopic equipment. One trocar site was enlarged to 3 cm to deliver the bowel through the abdominal wall. All anastomoses were hand-sewn. Postoperative hospitalization ranged from 2 to 31 days (median, five days). No mortality was noted, and morbidity was 20 percent. We conclude that laparoscopic-guided bowel surgery is technically feasible and should translate into shorter hospitalization and less patient discomfort. 相似文献
95.
Alfred S. Friedman Samuel Granick Cheryl Kreisher Arlene Terras 《The American journal on addictions / American Academy of Psychiatrists in Alcoholism and Addictions》1993,2(3):232-237
This “matching” study attempts to determine characteristics of adolescent drug abuse patients that may determine whether an inpatient or an outpatient treatment setting will be more effective or more suitable for meeting the needs of the patient. Compared to short-term inpatient treatment, long-term outpatient treatment was shown to have significantly greater effect in reducing substance use/abuse for patients who had relatively more severe social lifestyle problems, family problems, and employment problems. Outpatient treatment even showed a trend toward a significantly better outcome for patients with more severe psychiatric problems. 相似文献
96.
97.
Karen A Luker PhD BNurs RGN RHV NDNCert Kinta Beaver BA RGN DPSN Samuel J Leinster BSc MD FRCS R Glynn Owens BTech DipPsych DPhil AFBPsS Lesley F Degner PhD RN Jeffrey A Sloan PhD BSc 《Journal of advanced nursing》1995,22(1):134-141
Nurses can play a key role in patient education, including providing patients with useful and approrate information Rather than focusing on the process of education or information giving by nurses, this study places emphasis on the content of that information by taking the patients'perspective and asking the patients themselves what particular types of information are perceived as important at a specific point in time The aim of the study was to explore what particular types of information were important to women newly diagnosed with breast cancer, to enable nurses and other health care professionals to utilize their time as effectively as possible and provide a high-quality service to individuals in their care Women with breast cancer (a mean of 2 5 weeks from diagnosis) were interviewed and asked to compare items of information The items of information were presented m pairs and the women stated a preference for one item in that pan- Thirty-six pairs were presented in total The analysis involved the use of a Thurstone scaling model, which allowed rank ordermgs, or profiles of information needs, to be developed, reflecting the perceived importance of each item Information about the likelihood of cure, the spread of the disease and treatment options were perceived as the most important items of information at the tune of diagnosis Other information needs, in order of descending priority, included information about the risk to family, side-effects 相似文献
98.
P A Raymond 《Experimental eye research》1990,51(6):675-683
In the retina of teleost fish, cone horizontal cell axons penetrate the inner nuclear layer, where they enlarge into fusiform terminal swellings. The present study shows that horizontal cell axon terminals enlarge disproportionately during postembryonic growth of the retina in juvenile and adult goldfish: the relative volume of axon terminals increases almost 20-fold, while the volume of the entire retina increases only about fourfold during a 2-3-yr period. The enlarging axon terminals fill in the gaps created as the numerical density of nuclei in the inner nuclear layer falls. Horizontal cell axon terminals are thought to participate in cone-dominated visual pathways, although their precise role is unclear. The results of this study suggest that a comparison of horizontal cell function in small and large fish might help to resolve this issue. 相似文献
99.
100.