全文获取类型
收费全文 | 7347篇 |
免费 | 573篇 |
国内免费 | 28篇 |
专业分类
耳鼻咽喉 | 75篇 |
儿科学 | 227篇 |
妇产科学 | 144篇 |
基础医学 | 901篇 |
口腔科学 | 119篇 |
临床医学 | 693篇 |
内科学 | 1971篇 |
皮肤病学 | 85篇 |
神经病学 | 672篇 |
特种医学 | 234篇 |
外科学 | 906篇 |
综合类 | 156篇 |
一般理论 | 10篇 |
预防医学 | 713篇 |
眼科学 | 191篇 |
药学 | 488篇 |
中国医学 | 18篇 |
肿瘤学 | 345篇 |
出版年
2023年 | 33篇 |
2021年 | 134篇 |
2020年 | 70篇 |
2019年 | 124篇 |
2018年 | 158篇 |
2017年 | 135篇 |
2016年 | 152篇 |
2015年 | 191篇 |
2014年 | 229篇 |
2013年 | 370篇 |
2012年 | 409篇 |
2011年 | 499篇 |
2010年 | 294篇 |
2009年 | 256篇 |
2008年 | 450篇 |
2007年 | 476篇 |
2006年 | 446篇 |
2005年 | 465篇 |
2004年 | 425篇 |
2003年 | 389篇 |
2002年 | 348篇 |
2001年 | 115篇 |
2000年 | 96篇 |
1999年 | 101篇 |
1998年 | 85篇 |
1997年 | 57篇 |
1996年 | 39篇 |
1995年 | 59篇 |
1994年 | 48篇 |
1993年 | 59篇 |
1992年 | 61篇 |
1991年 | 66篇 |
1990年 | 64篇 |
1989年 | 47篇 |
1988年 | 41篇 |
1987年 | 48篇 |
1986年 | 42篇 |
1985年 | 49篇 |
1984年 | 64篇 |
1983年 | 55篇 |
1982年 | 53篇 |
1981年 | 55篇 |
1980年 | 47篇 |
1978年 | 42篇 |
1977年 | 36篇 |
1975年 | 37篇 |
1974年 | 33篇 |
1973年 | 36篇 |
1972年 | 33篇 |
1971年 | 26篇 |
排序方式: 共有7948条查询结果,搜索用时 37 毫秒
31.
Gerben B. Keijzers Don Campbell Jeffrey Hooper Nerolie Bost Julia Crilly Michael Craig Steele Chris Del Mar Leo M. G. Geeraedts Jr. 《World journal of surgery》2014,38(1):222-232
Objective
This study prospectively evaluated in-hospital and postdischarge missed injury rates in admitted trauma patients, before and after the formalisation of a trauma tertiary survey (TTS) procedure.Methods
Prospective before-and-after cohort study. TTS were formalised in a single regional level II trauma hospital in November 2009. All multitrauma patients admitted between March–October 2009 (preformalisation of TTS) and December 2009–September 2010 (post-) were assessed for missed injury, classified into three types: Type I, in-hospital, (injury missed at initial assessment, detected within 24 h); Type II, in-hospital (detected in hospital after 24 h, missed at initial assessment and by TTS); Type III, postdischarge (detected after hospital discharge). Secondary outcome measures included TTS performance rates and functional outcomes at 1 and 6 months.Results
A total of 487 trauma patients were included (pre-: n = 235; post-: n = 252). In-hospital missed injury rate (Types I and II combined) was similar for both groups (3.8 vs. 4.8 %, P = 0.61), as were postdischarge missed injury rates (Type III) at 1 month (13.7 vs. 11.5 %, P = 0.43), and 6 months (3.8 vs. 3.3 %, P = 0.84) after discharge. TTS performance was substantially higher in the post-group (27 vs. 42 %, P < 0.001). Functional outcomes for both cohorts were similar at 1 and 6 months follow-up.Conclusions
This is the first study to evaluate missed injury rates after hospital discharge and demonstrated cumulative missed injury rates >15 %. Some of these injuries were clinically relevant. Although TTS performance was significantly improved by formalising the process (from 27 to 42 %), this did not decrease missed injury rates. 相似文献32.
33.
The Effect of Acute Exercise on Undercarboxylated Osteocalcin and Insulin Sensitivity in Obese Men 下载免费PDF全文
Itamar Levinger George Jerums Nigel K Stepto Lewan Parker Fabio R Serpiello Glenn K McConell Mitchell Anderson David L Hare Elizabeth Byrnes Peter R Ebeling Ego Seeman 《Journal of bone and mineral research》2014,29(12):2571-2576
Acute exercise improves insulin sensitivity for hours after the exercise is ceased. The skeleton contributes to glucose metabolism and insulin sensitivity via osteocalcin (OC) in its undercarboxylated (ucOC) form in mice. We tested the hypothesis that insulin sensitivity over the hours after exercise is associated with circulating levels of ucOC. Eleven middle‐aged (58.1 ± 2.2 years mean ± SEM), obese (body mass index [BMI] = 33.1 ± 1.4 kg/m2) nondiabetic men completed a euglycemic‐hyperinsulinemic clamp at rest (rest‐control) and at 60 minutes after exercise (4 × 4 minutes of cycling at 95% of HRpeak). Insulin sensitivity was determined by glucose infusion rate relative to body mass (GIR, mL/kg/min) as well as GIR per unit of insulin (M‐value). Blood samples and five muscle biopsies were obtained; two at the resting‐control session, one before and one after clamping, and three in the exercise session, at rest, 60 minutes after exercise, and after the clamp. Exercise increased serum ucOC (6.4 ± 2.1%, p = 0.013) but not total OC (p > 0.05). Blood glucose was ~6% lower and insulin sensitivity was ~35% higher after exercise compared with control (both p < 0.05). Phosphorylated (P)‐AKT (Ak thymoma) was higher after exercise and insulin compared with exercise alone (no insulin) and insulin alone (no exercise, all p < 0.05). In a multiple‐linear regression including BMI, age, and aerobic fitness, ucOC was associated with whole‐body insulin sensitivity at rest (β = 0.59, p = 0.023) and after exercise (β = 0.66, p = 0.005). Insulin sensitivity, after acute exercise, is associated with circulating levels of ucOC in obese men. Whether ucOC has a direct effect on skeletal muscle insulin sensitivity after exercise is yet to be determined. © 2014 American Society for Bone and Mineral Research. 相似文献
34.
35.
Omar Galárraga Sandra G Sosa-Rubí Andrea González Florentino Badial-Hernández Carlos J Conde-Glez Luis Juárez-Figueroa Sergio Bautista-Arredondo Caroline Kuo Don Operario Kenneth H Mayer 《Journal of the International AIDS Society》2014,17(1)
Introduction
The objective of this article is to present the rationale and baseline results for a randomized controlled pilot trial using economic incentives to reduce HIV and sexually transmitted infection (STI) risk among male sex workers (MSWs) in Mexico City.Methods
Participants (n=267) were tested and treated for STIs (chlamydia, gonorrhoea, syphilis and HIV) and viral hepatitis (hepatitis B and C), received HIV and STI prevention education and were randomized into four groups: (1) control, (2) medium conditional incentive ($50/six months), (3) high conditional incentive ($75/six months) and (4) unconditional incentive ($50/six months). In the conditional arms, incentives were contingent upon testing free of new curable STIs (chlamydia, gonorrhoea and syphilis) at follow-up assessments.Results
Participants’ mean age was 25 years; 8% were homeless or lived in a shelter, 16% were unemployed and 21% lived in Mexico City less than 5 years. At baseline, 38% were living with HIV, and 32% tested positive for viral hepatitis or at least one STI (other than HIV). Participants had a mean of five male clients in the previous week; 18% reported condomless sex with their last client. For 37%, sex work was their main occupation and was conducted mainly on the streets (51%) or in bars/discotheques (24%) and hotels (24%). The average price for a sex transaction was $25 with a 35% higher payment for condomless sex.Conclusions
The findings suggest that economic incentives are a relevant approach for HIV prevention among MSWs, given the market-based inducements for unprotected sex. This type of targeted intervention seems to be justified and should continue to be explored in the context of combination prevention efforts. 相似文献36.
37.
Manoj Kamal Don Varghese Jeet Bhagde Geeta Singariya Annie Miju Simon Amar Singh 《Brazilian Journal of Anesthesiology》2018,68(2):197-199
Patients with Patau's syndrome (Trisomy 13) have multiple craniofacial, cardiac, neurological and renal anomalies with very less life expectancy. Among craniofacial anomalies cleft lip and palate are common. These craniofacial and cardiac anomalies present difficulties with anesthesia. We therefore describe the anesthetic management in the case of a Trisomy 13 child for operated for cleft lip at 10 months of age. 相似文献
38.
39.