全文获取类型
收费全文 | 4347篇 |
免费 | 383篇 |
国内免费 | 81篇 |
专业分类
耳鼻咽喉 | 21篇 |
儿科学 | 210篇 |
妇产科学 | 83篇 |
基础医学 | 530篇 |
口腔科学 | 114篇 |
临床医学 | 477篇 |
内科学 | 994篇 |
皮肤病学 | 111篇 |
神经病学 | 203篇 |
特种医学 | 498篇 |
外科学 | 422篇 |
综合类 | 87篇 |
一般理论 | 1篇 |
预防医学 | 400篇 |
眼科学 | 30篇 |
药学 | 319篇 |
2篇 | |
中国医学 | 1篇 |
肿瘤学 | 308篇 |
出版年
2023年 | 19篇 |
2022年 | 22篇 |
2021年 | 44篇 |
2020年 | 42篇 |
2019年 | 49篇 |
2018年 | 61篇 |
2017年 | 59篇 |
2016年 | 53篇 |
2015年 | 64篇 |
2014年 | 109篇 |
2013年 | 140篇 |
2012年 | 136篇 |
2011年 | 124篇 |
2010年 | 137篇 |
2009年 | 137篇 |
2008年 | 138篇 |
2007年 | 200篇 |
2006年 | 146篇 |
2005年 | 157篇 |
2004年 | 139篇 |
2003年 | 148篇 |
2002年 | 126篇 |
2001年 | 118篇 |
2000年 | 107篇 |
1999年 | 116篇 |
1998年 | 171篇 |
1997年 | 177篇 |
1996年 | 156篇 |
1995年 | 132篇 |
1994年 | 149篇 |
1993年 | 110篇 |
1992年 | 80篇 |
1991年 | 92篇 |
1990年 | 80篇 |
1989年 | 99篇 |
1988年 | 79篇 |
1987年 | 83篇 |
1986年 | 107篇 |
1985年 | 98篇 |
1984年 | 65篇 |
1983年 | 48篇 |
1982年 | 57篇 |
1981年 | 44篇 |
1980年 | 47篇 |
1979年 | 31篇 |
1978年 | 34篇 |
1977年 | 39篇 |
1976年 | 40篇 |
1975年 | 44篇 |
1973年 | 24篇 |
排序方式: 共有4811条查询结果,搜索用时 15 毫秒
1.
JM Martín† L Calduch† C Monteagudo‡ I Molina† D Ramón† V Alonso† E Jordᆠ《Journal of the European Academy of Dermatology and Venereology》2006,20(4):428-431
Cutaneous plasmacytosis is a rare disorder characterized by a benign proliferation of mature plasma cells that appears as multiple dark-brown to purplish skin lesions, often associated with polyclonal hypergammaglobulinaemia. We present the case of a 55-year-old Caucasian man who suffered from a cutaneous plasmacytosis associated with two different carcinomas. Cutaneous plasmacytosis seems to be a reactive process because most cases reported are not associated with any apparent underlying disease. Nevertheless, because few reported cases were associated with malignancies, screening of additional neoplasms would be justified. 相似文献
2.
3.
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
4.
5.
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
6.
JM Vilanova J Figueras-Aloy J Roselló G Gómez E Gelpí R Jiménez 《Acta paediatrica (Oslo, Norway : 1992)》1998,87(5):588-592
The aim of this study was to evaluate the cerebral synthesis of eicosanoids in the asphyctic newborn and to investigate the relation between the prostanoid profiles in cerebrospinal fluid (CSF) and the appearance and severity of hypoxic-ischaemic encephalopathy (HIE). Levels of 6-keto-PGF 1-α, TXB2 , PGE2 and PGF2-α in CSF were measured in 40 full term newborns during the first day of life. Thirty of these newborns had birth asphyxia and were divided into three groups: 10 without HIE, 12 with mild HIE and 8 with moderate-severe HIE. They were compared to a control group of 10 non-hypoxic newborns. Determinations of the metabolites in CSF were performed by RIA and expressed as pg/ml (mean ± SD). The CSF TXB2 (thromboxane A2 metabolite) in asphyxiated newborns was always higher than in the control group (28.12 ± 10.6), and related to the severity of HIE ( p = 0:005): without HIE (50.84 ± 16.4; p = 0:02), mild HIE (80.65 ± 12.64; p ± 0:01) and moderate-severe HIE (178.14 ± 20.5; p < 0:01). The CSF 6-keto-PGF 1-α (prostacyclin metabolite) in asphyxiated newborns was always higher than in the control group (80.55 ± 12.56), but indirectly related to the severity of HIE: without HIE (240.95 ± 28.12; p < 0:01), mild HIE (183.65 ± 30.1; p < 0:01) and moderate-severe HIE (140.55 ± 25.12; p < 0:01). In the moderate-severe HIE group, the increase in TXB2 was higher than the rise in 6-keto-PGF 1-α . 相似文献
7.
8.
9.
10.