全文获取类型
收费全文 | 9250篇 |
免费 | 719篇 |
国内免费 | 32篇 |
专业分类
耳鼻咽喉 | 167篇 |
儿科学 | 203篇 |
妇产科学 | 157篇 |
基础医学 | 1136篇 |
口腔科学 | 176篇 |
临床医学 | 997篇 |
内科学 | 1726篇 |
皮肤病学 | 152篇 |
神经病学 | 696篇 |
特种医学 | 367篇 |
外科学 | 1567篇 |
综合类 | 117篇 |
一般理论 | 14篇 |
预防医学 | 935篇 |
眼科学 | 102篇 |
药学 | 808篇 |
中国医学 | 28篇 |
肿瘤学 | 653篇 |
出版年
2023年 | 84篇 |
2022年 | 118篇 |
2021年 | 260篇 |
2020年 | 145篇 |
2019年 | 238篇 |
2018年 | 242篇 |
2017年 | 211篇 |
2016年 | 204篇 |
2015年 | 233篇 |
2014年 | 347篇 |
2013年 | 442篇 |
2012年 | 632篇 |
2011年 | 587篇 |
2010年 | 376篇 |
2009年 | 327篇 |
2008年 | 551篇 |
2007年 | 567篇 |
2006年 | 547篇 |
2005年 | 493篇 |
2004年 | 458篇 |
2003年 | 445篇 |
2002年 | 385篇 |
2001年 | 137篇 |
2000年 | 126篇 |
1999年 | 123篇 |
1998年 | 86篇 |
1997年 | 64篇 |
1996年 | 69篇 |
1995年 | 59篇 |
1994年 | 62篇 |
1993年 | 50篇 |
1992年 | 81篇 |
1991年 | 73篇 |
1990年 | 72篇 |
1989年 | 77篇 |
1988年 | 58篇 |
1987年 | 56篇 |
1986年 | 69篇 |
1985年 | 74篇 |
1984年 | 62篇 |
1983年 | 54篇 |
1982年 | 67篇 |
1981年 | 34篇 |
1980年 | 36篇 |
1979年 | 42篇 |
1978年 | 42篇 |
1977年 | 29篇 |
1975年 | 40篇 |
1974年 | 30篇 |
1973年 | 42篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
Moshe Yaniv Tali Becker Michal Goldwirt Sam Khamis David M Steinberg Shlomo Weintroub 《Clinical journal of sport medicine》2006,16(5):392-396
OBJECTIVE: Little is known about the interactions of sports-related demands and human body, in particular on musculoskeletal features, during growth. Focusing on the relationship between soccer and lower limb alignment, we examined the hypothesis that varus knee deviation is more prevalent among high-performance pediatric and adolescent soccer players. DESIGN: Cross-sectional study with focused sampling. SETTING: First league sports clubs. PARTICIPANTS: 106 male child/adolescent soccer players aged 10 to 21 years and 68 age-matched tennis players. INTERVENTIONS: All athletes completed a demographic questionnaire and underwent physical examinations, which included height, weight, generalized laxity, knee, ankle, foot and spine axis, hip range of motion, tibial torsion, Q angle, foot navicular height, and progression angle. MAIN OUTCOME MEASUREMENT: Varus/valgus axis was determined by the intercondylar intermalleolar distance while standing. Soccer and tennis players were compared on knee axis and other outcome variables by analysis of covariance, adjusting for age and by t-tests within age groups. RESULTS: A significantly higher prevalence of knee varus was found among the soccer players compared to that among the tennis players. The difference in intracondylar distance was statistically significant after the age of 13 years (P < 0.001). In addition, compared to tennis players, soccer players had higher foot arches, decreased hip external rotation and increased external tibial torsion. CONCLUSIONS: Varus knee axis deviation was more common among children and adolescent soccer players than among tennis players. The prevalence was more pronounced among players aged 13 years or older. Further research is needed to explore the rationale of this phenomenon. 相似文献
5.
Rajesh Bhat Alison Severn Sam Chakraverty 《Nephrology, dialysis, transplantation》2006,21(9):2642-2643
Placement of tunnelled dialysis lines is effective using ultrasoundand fluoroscopic guidance [1] and has a higher success ratethan blind insertion [2]. After the ultrasound guided access into a neck vein, wires andcatheters are guided in to a suitable position in the 相似文献
6.
Brief review: History, concept and controversies in the neurological determination of death 总被引:1,自引:0,他引:1
Leonard Baron Sam D. Shemie Jeannie Teitelbaum Christopher James Doig 《Journal canadien d'anesthésie》2006,53(6):602-608
PURPOSE: Despite general worldwide acceptance of the concept of neurological determination of death (NDD), inconsistencies in clinical criteria and ancillary testing requirements remain. Numerous guidelines for NDD may be applied in clinical practice by a variety of medical practitioners, but the scientific rationale for specific guideline recommendations often remains unclear. This review examines the evolution of NDD, and seeks to provide scientific validation for existing NDD criteria. SOURCE: English language peer-reviewed medical journals and established contemporary medical texts. PRINCIPAL FINDINGS: Currently published guidelines appear to have evolved from the work of the ad hoc Committee of the Harvard Medical School to Examine the Definition of Brain Death. The Conference of the Royal Colleges and Faculties of the United Kingdom refined the criteria and subsequently adopted the principal of brainstem death. While the fundamentals of NDD guidelines are remarkably consistent worldwide, specific criteria and requirements are often inconsistent. CONCLUSION: Numerous controversies regarding NDD continue to exist, necessitating further scientific clarification of these issues. More recently published guidelines representing the collective opinion of world experts in NDD based upon best current scientific evidence are available in current medical journals. 相似文献
7.
8.
With some, but not all, types and intensities of exercise, lactate accumulates in the blood and in the muscles engaged in the exercise. A great deal of attention has been directed towards attempting to understand the dynamics of lactate production and removal at the onset of exercise, during exercise, and during the recovery process following exercise. It has been hoped that an unravelling of these events would provide a key to understanding cellular metabolism and its regulation during exercise. The purpose of this introductory paper to a symposium on lactate is to present a brief overview of some of the conditions that influence the rate and magnitude of lactate accumulation during exercise. It is pointed out that many conditions influence the rate and magnitude of the accumulation of lactate in blood and muscles. Included are diet, state of physical fitness, and the type and duration of the exercise. We have cautioned against trying to evaluate the state of oxygen delivery to muscle and the state of tissue oxygenation from the appearance of lactate in blood. We have pointed out the positive aspects of lactate production based on how it augments the cellular supply of ATP, thereby allowing for high intensity exercise, and also the negative aspects that develop as a result the reduction in pH which adversely influences many cellular processes essential for muscular activity. 相似文献
9.
Ann G Schwartz Geoffrey M Prysak Valerie Murphy Fulvio Lonardo Harvey Pass Jan Schwartz Sam Brooks 《Clinical cancer research》2005,11(20):7280-7287
PURPOSE: A role for estrogens in determining lung cancer risk and prognosis is suggested by reported sex differences in susceptibility and survival. Archival lung tissue was evaluated for the presence of nuclear estrogen receptor (ER)-alpha and ER-beta and the relationship between ER status, subject characteristics, and survival. EXPERIMENTAL DESIGN: Paraffin-embedded lung tumor samples were obtained from 214 women and 64 men from two population-based, case-control studies as were 10 normal lung autopsy samples from patients without cancer. Nuclear ER-alpha and ER-beta expression was determined by immunohistochemistry. Logistic regression was used to identify factors associated with ER positivity and Cox proportional hazards models were used to measure survival differences by ER status. RESULTS: Neither tumor (0 of 94) nor normal (0 of 10) lung tissue stained positive for ER-alpha. Nuclear ER-beta positivity was present in 61% of tumor tissue samples (170 of 278; 70.3% in men and 58.3% in women) and 20% of normal tissue samples (2 of 10; P = 0.01). In multivariate analyses, females were 46% less likely to have ER-beta-positive tumors than males (odds ratio, 0.54; 95% confidence interval, 0.27-1.08). This relationship was stronger and statistically significant in adenocarcinomas (odds ratio, 0.40; 95% confidence interval, 0.18-0.89). Women with ER-beta-positive tumors had a nonsignificant 73% (P = 0.1) increase in mortality, whereas men with ER-beta-positive tumors had a significant 55% (P = 0.04) reduction in mortality compared with those with ER-beta-negative tumors. CONCLUSIONS: This study suggests differential expression by sex and influence on survival in men of nuclear ER-beta in lung cancer, particularly in adenocarcinomas. 相似文献
10.