全文获取类型
| 收费全文 | 1088941篇 |
| 免费 | 77135篇 |
| 国内免费 | 2611篇 |
专业分类
| 耳鼻咽喉 | 13699篇 |
| 儿科学 | 37645篇 |
| 妇产科学 | 29888篇 |
| 基础医学 | 156729篇 |
| 口腔科学 | 28218篇 |
| 临床医学 | 95930篇 |
| 内科学 | 212119篇 |
| 皮肤病学 | 23343篇 |
| 神经病学 | 88352篇 |
| 特种医学 | 42635篇 |
| 外国民族医学 | 305篇 |
| 外科学 | 165593篇 |
| 综合类 | 24529篇 |
| 一般理论 | 385篇 |
| 预防医学 | 86196篇 |
| 眼科学 | 23520篇 |
| 药学 | 76813篇 |
| 3篇 | |
| 中国医学 | 2034篇 |
| 肿瘤学 | 60751篇 |
出版年
| 2018年 | 21361篇 |
| 2017年 | 16970篇 |
| 2016年 | 19798篇 |
| 2015年 | 10959篇 |
| 2014年 | 14688篇 |
| 2013年 | 22251篇 |
| 2012年 | 31936篇 |
| 2011年 | 40446篇 |
| 2010年 | 26130篇 |
| 2009年 | 23054篇 |
| 2008年 | 38726篇 |
| 2007年 | 42898篇 |
| 2006年 | 31176篇 |
| 2005年 | 31687篇 |
| 2004年 | 31417篇 |
| 2003年 | 31531篇 |
| 2002年 | 29330篇 |
| 2001年 | 47221篇 |
| 2000年 | 48533篇 |
| 1999年 | 40455篇 |
| 1998年 | 11370篇 |
| 1997年 | 10347篇 |
| 1996年 | 10308篇 |
| 1995年 | 9920篇 |
| 1994年 | 9273篇 |
| 1993年 | 8615篇 |
| 1992年 | 32365篇 |
| 1991年 | 31594篇 |
| 1990年 | 31130篇 |
| 1989年 | 29986篇 |
| 1988年 | 27267篇 |
| 1987年 | 27441篇 |
| 1986年 | 25529篇 |
| 1985年 | 24705篇 |
| 1984年 | 18466篇 |
| 1983年 | 15580篇 |
| 1982年 | 9378篇 |
| 1981年 | 8386篇 |
| 1979年 | 16950篇 |
| 1978年 | 12274篇 |
| 1977年 | 10330篇 |
| 1976年 | 9819篇 |
| 1975年 | 10179篇 |
| 1974年 | 12348篇 |
| 1973年 | 11853篇 |
| 1972年 | 10884篇 |
| 1971年 | 10113篇 |
| 1970年 | 9403篇 |
| 1969年 | 8761篇 |
| 1968年 | 8124篇 |
排序方式： 共有10000条查询结果，搜索用时 15 毫秒
121.
122.
Imre W.K. Kouw Bart B.L. Groen Joey S.J. Smeets Irene Fleur Kramer Janneau M.X. van Kranenburg Rachél Nilwik Jan A.P. Geurts René H.M. ten Broeke Martijn Poeze Luc J.C. van Loon Lex B. Verdijk 《Journal of the American Medical Directors Association》2019,20(1):35-42
Objectives
Short successive periods of skeletal muscle disuse have been suggested to substantially contribute to the observed loss of skeletal muscle mass over the life span. Hospitalization of older individuals due to acute illness, injury, or major surgery generally results in a mean hospital stay of 5 to 7 days, during which the level of physical activity is strongly reduced. We hypothesized that hospitalization following elective total hip arthroplasty is accompanied by substantial leg muscle atrophy in older men and women.Design and participants
Twenty-six older patients (75 ± 1 years) undergoing elective total hip arthroplasty participated in this observational study.Measurements
On hospital admission and on the day of discharge, computed tomographic (CT) scans were performed to assess muscle cross-sectional area (CSA) of both legs. During surgery and on the day of hospital discharge, a skeletal muscle biopsy was taken from the m. vastus lateralis of the operated leg to assess muscle fiber type–specific CSA.Results
An average of 5.6 ± 0.3 days of hospitalization resulted in a significant decline in quadriceps (?3.4% ± 1.0%) and thigh muscle CSA (?4.2% ± 1.1%) in the nonoperated leg (P < .05). Edema resulted in a 10.3% ± 1.7% increase in leg CSA in the operated leg (P < .05). At hospital admission, muscle fiber CSA was smaller in the type II vs type I fibers (3326 ± 253 μm2 vs 4075 ± 279 μm2, respectively; P < .05). During hospitalization, type I and II muscle fiber CSA tended to increase, likely due to edema in the operated leg (P = .10).Conclusions
Six days of hospitalization following elective total hip arthroplasty leads to substantial leg muscle atrophy in older patients. Effective intervention strategies are warranted to prevent the loss of muscle mass induced by short periods of muscle disuse during hospitalization. 相似文献123.
B. Midouni E. Mehiri A. Ghariani H. Draoui L. Essalah I. Bouzouita D. Raoult L. Slim-Saidi P.E. Fournier 《International journal of antimicrobial agents》2019,53(1):63-69
Objectives
This study aimed to explore the genetic diversity of Streptococcus pneumoniae isolates in a Tunisian pneumology hospital.Methods
A total of 141 S. pneumoniae strains isolated between 2009–2016 in the microbiology laboratory at A. Mami Hospital of Pneumology were investigated. Antimicrobial susceptibility testing was performed the disk diffusion method. MICs of penicillin G, amoxicillin and cefotaxime were determined by Etest. Serotyping was inferred from the results of multiplex PCR targeting 40 serotypes. Sequence types (STs) were determined by multilocus sequence typing (MLST).Results
Among the 141 S. pneumoniae isolates, 98 (69.5%) were resistant to erythromycin. Evaluation of β-lactam susceptibility showed that 90 strains (63.8%) were non-susceptible to penicillin, whereas 48 (34.0%) had decreased susceptibility to amoxicillin and 21 (14.9%) to cefotaxime. Twenty-five serotypes were detected, and 10 isolates were classified as non-typeable. Vaccine coverage was 56.7%, 60.3% and 75.2% for pneumococcal conjugate vaccine 7 (PCV7), PCV10 and PCV13, respectively. Overall, 73 STs were identified, including 23 described for the first time. The most frequent STs were ST179 (n?=?17), ST3772 (n?=?14), ST2918 (n?=?10) and ST4003 (n?=?5), related to serotypes 19F, 19A, 14 and 23F, respectively. Moreover, 110 strains were classified within 45 STs. Three international antimicrobial-resistant clones were found, including Denmark14-ST230 (n?=?22), Spain9V-ST156 (n?=?22) and Portugal19F-ST177 (n?=?20).Conclusion
This study emphasises the clonal and international dissemination of antimicrobial-resistant S. pneumoniae clones. Significant differences in genetic variation were documented by MLST within the various serotypes identified. 相似文献124.
125.
126.
127.
128.
129.
ABSTRACTA monocausal bacteriological understanding of infectious disease orients tuberculosis control efforts towards antimicrobial interventions. A bias towards technological solutions can leave multistranded public health and social interventions largely neglected. In the context of globalising biomedical approaches to infectious disease control, this ethnography-inspired review article reflects upon the implementation of rapid diagnostic technology in low- and middle-income countries. Fieldwork observations in Vietnam provided a stimulus for a critical review of the global rollout of tuberculosis diagnostic technology. To address local needs in tuberculosis control, health managers in resource-poor settings are readily cooperating with international donors to deploy novel diagnostic technologies throughout national tuberculosis programme facilities. Increasing investment in new diagnostic technologies is predicated on the supposition that these interventions will ameliorate disease outcomes. However, suboptimal treatment control persists even when accurate diagnostic technologies are available, suggesting that promotion of singular technological solutions can distract from addressing systemic change, without which disease susceptibility, propagation of infection, detection gaps, diagnostic delays, and treatment shortfalls persist. 相似文献
130.