全文获取类型
收费全文 | 49108篇 |
免费 | 8560篇 |
国内免费 | 122篇 |
专业分类
耳鼻咽喉 | 623篇 |
儿科学 | 1568篇 |
妇产科学 | 1371篇 |
基础医学 | 4538篇 |
口腔科学 | 1816篇 |
临床医学 | 10364篇 |
内科学 | 9691篇 |
皮肤病学 | 1031篇 |
神经病学 | 5696篇 |
特种医学 | 1107篇 |
外国民族医学 | 4篇 |
外科学 | 5213篇 |
综合类 | 359篇 |
现状与发展 | 2篇 |
一般理论 | 45篇 |
预防医学 | 7029篇 |
眼科学 | 843篇 |
药学 | 2380篇 |
中国医学 | 23篇 |
肿瘤学 | 4087篇 |
出版年
2024年 | 172篇 |
2023年 | 1534篇 |
2022年 | 716篇 |
2021年 | 1743篇 |
2020年 | 1766篇 |
2019年 | 1472篇 |
2018年 | 2582篇 |
2017年 | 2424篇 |
2016年 | 2552篇 |
2015年 | 2612篇 |
2014年 | 3161篇 |
2013年 | 3663篇 |
2012年 | 3345篇 |
2011年 | 3578篇 |
2010年 | 2591篇 |
2009年 | 2713篇 |
2008年 | 2865篇 |
2007年 | 2687篇 |
2006年 | 2592篇 |
2005年 | 2274篇 |
2004年 | 2007篇 |
2003年 | 1739篇 |
2002年 | 1735篇 |
2001年 | 488篇 |
2000年 | 311篇 |
1999年 | 436篇 |
1998年 | 586篇 |
1997年 | 534篇 |
1996年 | 457篇 |
1995年 | 432篇 |
1994年 | 292篇 |
1993年 | 269篇 |
1992年 | 189篇 |
1991年 | 143篇 |
1990年 | 130篇 |
1989年 | 138篇 |
1988年 | 132篇 |
1987年 | 111篇 |
1986年 | 85篇 |
1985年 | 78篇 |
1984年 | 64篇 |
1983年 | 62篇 |
1982年 | 49篇 |
1981年 | 43篇 |
1980年 | 30篇 |
1979年 | 19篇 |
1978年 | 22篇 |
1977年 | 19篇 |
1973年 | 18篇 |
1971年 | 18篇 |
排序方式: 共有10000条查询结果,搜索用时 93 毫秒
91.
92.
Neslihan Eminkahyagil DDS MSc PhD ; Selim Erkut DDS PhD 《Journal of prosthodontics》2006,15(5):316-320
Immediate chairside replacement of an extracted anterior tooth may contribute to a patient's comfort, treatment acceptance, and expectations of treatment; however, fabrication of a custom restoration in the anterior region of the mouth may result in an esthetic compromise for patients during the fabrication period. Chairside tooth replacement is an excellent application of fiber-reinforced composite resin technology. This article presents an innovative, affordable chairside procedure in which Ribbond Multi-Purpose Bondable Reinforcement Ribbon is used to replace a single extracted anterior tooth using the patient's own tooth. 相似文献
93.
OBJECTIVES: To determine whether the increase in the incidence of injury found for the first summer season in which rugby league (RL) was played in the UK was repeated in subsequent summer seasons. DESIGN: A retrospective and prospective cohort study design. SETTING AND PARTICIPANTS: Injuries were recorded from all players who took part in 141 games over 3 summer seasons (1997 to 1999) for 1 professional team. These were compared against rates from previously collected data for 3 earlier winter and 1 summer season. ASSESSMENT OF RISK FACTORS: For each injury it was recorded in which season it occurred; how many games or training sessions, if any, were subsequently missed; the type, site and severity of injury. MAIN OUTCOME MEASURES: Injuries were reported as rate per 1000 hours, also broken down into severity according to the number of games missed and whether subsequent training sessions were missed. RESULTS: A sustained increase in injury incidence has been found comparing summer RL over RL played in the winter. There was an increase in injury rates for all sites and types, but not all reached significance. CONCLUSIONS: Data collected over 6 seasons indicate a higher risk of sustaining an injury playing summer RL, but the cause may be related to a combination of factors. These may include the ground or weather conditions associated with summer rugby, player characteristics or changes in the game itself and future research needs to investigate these further. 相似文献
94.
Jessica Swoboda DDS H. Asuman Kiyak MA PhD Rigmor E. Persson DDS MSD G. Rutger Persson DDS PhD David K. Yamaguchi PhD Michael I. MacEntee LDS FRCD© PhD Christopher C.L. Wyatt BSc DMD MSc 《Special care in dentistry》2006,26(4):137-144
There is limited information regarding oral health status and other predictors of oral health‐related quality of life. An association between oral health status and perceived oral health‐related quality of life (OHQOL) might help clinicians motivate patients to prevent oral diseases and improve the outcome of some dental public health programs. This study evaluated the relationship between older persons' OHQOL and their functional dentition, caries, periodontal status, chronic diseases, and some demographic characteristics. A group of 733 low‐income elders (mean age 72.7 ISD=4.71, 55.6% women, 55.1% members of ethnic minority groups in the U.S. and Canada) enrolled in the TEETH clinical trial were interviewed and examined as part of their fifth annual visit for the trial. OHQOL was measured by the Geriatric Oral Health Assessment Index (GOHAI); oral health and occlusal status by clinical exams and the Eichner Index; and demographics via interviews. Elders who completed the four‐year assessment had an average of 21.5 teeth (SD=6.9). with 8.5 occluding pairs (SD=4.6), and 32% with occlusal contacts in all four occluding zones. Stepwise multiple regressions were conducted to predict total GOHAI and its subscores (Physical, Social, and Worry). Functional dentition was a less significant predictor than ethnicity and being foreign‐bom. These variables, together with gender, years since immigrating, number of carious roots, and periodontal status, could predict 32% of the variance in total GOHAI, 24% in Physical, 27% in Social, and 21 % in the Worry subscales. These findings suggest that functional dentition and caries influence older adults' OHQOL, but that ethnicity and immigrant status play a larger role. 相似文献
95.
96.
97.
Modulation of cytokine production from an EpiOcular corneal cell culture model in response to Staphylococcus aureus superantigen 总被引:3,自引:0,他引:3
A Thakur PhD A Clegg MSc A Chauhan MSc MDP Willcox PhD 《Clinical & experimental ophthalmology》1997,25(4):43-45
The present study investigated the hypothesis that Staphylococcus aureus enterotoxin B (SEE) produces epithelial cell death and releases inflammatory cytokines that produce stromal infiltration during contact lens induced peripheral ulceration. Epithelial cells were incubated with different doses of SEB for various time periods. Culture supernatants were assayed for cytokines IL- lo, IL-6 and chemotactic agents IL-8 and LTB,. SEE induced the production of IL- I p and IL-8. Epithelial cells exposed for longer periods (48 h) with low concentrations of SEB produced significantly higher levels (N0.02) of IL-Ip and IL-8 (P<0.05) compared t o a 24 h exposure. SEB did not induce the production o f IL-6 and 相似文献
98.
99.
Studies on the effectiveness of pain management have uniformly concluded that health care providers underestimate or undertreat pain. In the emergency department (ED) in which this study was conducted, physicians receive formal didactic and bedside teaching on pain recognition and management in order to heighten the awareness of patient's need for pain control. The purpose of this study was to determine if this outpatient pain management of patients with acute, painful conditions is better than that reported in the medical literature. In this prospective study, 110 adult patients who had an acute, painful diagnosis were telephoned 48 hours after discharge from the ED and asked if they felt their pain at home was well controlled. Patient satisfaction with pain control was higher (91%) than that reported in the medical literature. Also, pain medication was provided more frequently by this study's ED (95%). Education on pain awareness and treatment is a way to improve pain management. 相似文献
100.
Congenital cardiac malformations in Adams-Oliver syndrome 总被引:1,自引:0,他引:1
Whole genomic hprt clones were used in Southern analysis to screen the integrity of the hprt gene in a family that includes a patient with HPRT enzyme deficiency causal to Lesch-Nyhan syndrome. A 5 kb DNA sequence deletion was found to have its endpoints in the first and third introns. The probes identified the carrier status of female family members, aided by an RFLP carried by the mother's normal X-chromosome. 相似文献