首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   6669篇
  免费   603篇
  国内免费   11篇
耳鼻咽喉   62篇
儿科学   171篇
妇产科学   294篇
基础医学   885篇
口腔科学   50篇
临床医学   1019篇
内科学   1027篇
皮肤病学   168篇
神经病学   505篇
特种医学   136篇
外国民族医学   1篇
外科学   836篇
综合类   151篇
一般理论   12篇
预防医学   818篇
眼科学   55篇
药学   592篇
中国医学   7篇
肿瘤学   494篇
  2023年   19篇
  2022年   42篇
  2021年   109篇
  2020年   56篇
  2019年   115篇
  2018年   136篇
  2017年   106篇
  2016年   138篇
  2015年   143篇
  2014年   209篇
  2013年   326篇
  2012年   473篇
  2011年   458篇
  2010年   280篇
  2009年   244篇
  2008年   442篇
  2007年   434篇
  2006年   405篇
  2005年   393篇
  2004年   390篇
  2003年   336篇
  2002年   306篇
  2001年   145篇
  2000年   97篇
  1999年   108篇
  1998年   66篇
  1997年   54篇
  1996年   55篇
  1995年   62篇
  1994年   40篇
  1993年   51篇
  1992年   101篇
  1991年   84篇
  1990年   62篇
  1989年   80篇
  1988年   57篇
  1987年   51篇
  1986年   42篇
  1985年   61篇
  1984年   64篇
  1983年   46篇
  1982年   35篇
  1981年   30篇
  1980年   26篇
  1979年   35篇
  1978年   24篇
  1977年   23篇
  1976年   19篇
  1974年   26篇
  1973年   23篇
排序方式: 共有7283条查询结果,搜索用时 31 毫秒
41.
42.
AIM: To investigate women's perceptions of the contribution of cardiac rehabilitation to their recovery from a myocardial infarction. BACKGROUND AND PURPOSE: Cardiac rehabilitation programs have been based on research with almost exclusively male participants. It was unclear if cardiac rehabilitation programs meet the needs of women. METHOD: Ten women who had experienced one or more myocardial infarctions were interviewed. Data from these interviews were analysed using Glaserian grounded theory. FINDINGS: The core category that emerged from the data was 'regaining everydayness'. Participants worked to regain their 'everydayness' through a basic social process of 'reframing'. Reframing involved coming to terms with what they had experienced and fitting it into their lives. Other categories related to symptom recognition and recovery. CONCLUSION: Cardiac rehabilitation programs contributed to overall recovery from a myocardial infarction in different ways for each participant. Although programs provided information for participants, they failed to provide the type of support needed to effectively aid reframing and recovery. Programs did not meet the needs of all participants and it was apparent that one size does not fit all.  相似文献   
43.
44.
BACKGROUND: Risperidone has been shown to be clinically effective for the treatment of aggressive behavior in children, yet no information is available regarding whether risperidone exhibits aggression-specific suppression in preclinical studies that use validated developmentally immature animal models of escalated aggression. Previously, we have shown that exposure to low doses of the psychostimulant cocaine-hydrochloride (.5 mg/kg intraperitoneally) during the majority of pubertal development (postnatal days [P]27-57) generates animals that exhibit a high level of offensive aggression. This study examined whether risperidone exerts selective aggression-suppressing effects by using this pharmacologic animal model of highly escalated offensive aggression. METHODS: Experimental hamsters were tested for offensive aggression after the acute administration of risperidone (.05-1.0 mg/kg, intraperitoneally). RESULTS: Risperidone dose-dependently reduced the highly aggressive phenotype, with a significant reduction observed at .1-.2 mg/kg for most aggressive responses measured. Experimental animals treated with higher doses of risperidone (.3-1.0 mg/kg) showed significant reductions in aggression and social interest toward intruders, indicating more general behavioral inhibition. CONCLUSIONS: These studies provide evidence that risperidone exerts specific aggression-suppressing effects in a developmentally immature animal model of escalated aggression.  相似文献   
45.
Does increased intracranial pressure in patients with pseudotumour cerebri PTC result in cognitive impairments The results of previous investigations have not clarified this question It may be that there is a subgroup within those diagnosed with PTC that does experience cognitive decline with increased intracranial pressure However elevated intracranial pressure headache and emotional distress also can contribute to reduced cognitive performance and increased self monitoring As a result of the lack of clarity regarding the impact of PTC on cognition clinicians are left with no empirically derived practice guidelines A case study demonstrates subjective complaints of concentration and memory deficits in a depressed patient with PTC whose neuropsychological stores except Seashore Rhythm Test were in the normal range  相似文献   
46.
This paper presents the results of a qualitative study conducted by midwife researchers into women's experience of new motherhood. Data were collected using focus groups involving 55 first-time mothers and analysed using grounded theory method. The analysis produced six categories: 'realizing', 'unready', 'drained', 'aloneness', 'loss' and 'working it out'. The core category, 'becoming a mother', integrates all other categories and encapsulates the process of change experienced by women. Also explained are factors mediating the often distressing experience of becoming a mother. The analysis provides a conceptualization of early motherhood enabling the development of strategies for midwives, nurses and others helping women negotiate this challenge.  相似文献   
47.
Trichomonas vaginalis causes a common genitourinary infection which is frequently asymptomatic. At present, pregnant women are not usually screened for the infection unless they are symptomatic. In the present study, we screened and obtained samples for culture from all pregnant women attending a prenatal clinic with the InPouch TV culture system and compared results with those of standard culture in Diamond's medium and slide wet mount examination. The InPouch TV culture system was as reliable as Diamond's medium in detecting T. vaginalis and may be useful and effective in a pregnancy clinic setting.  相似文献   
48.
49.
Cell surface proteins of the human gastric pathogen Helicobacter pylori, reference strain CCUG 17874, were extracted with acid glycine and fractionated by heparin affinity chromatography. The extracts were subsequently analysed using high-resolution two-dimensional gel electrophoresis (2-DE) and immunoblotting. Four proteins of low molecular masses (25-30 kDa) stained by Coomassie R-350, were identified by peptide ESI-MS/MS sequencing after in-gel tryptic digestion. The identified proteins were recognised by sera from H. pylori-infected patients. Two of them are now described for the first time as immunogenic proteins of which one protein was determined to be distinct from all H. pylori proteins previously described. In addition, the specificity of the identified peptides was evaluated using both 1-D and 2-D immunoblotting against a panel of sera from patients with various bacterial infections. The present identification of highly specific antigens of H. pylori will encourage the improvement of serological diagnostic tests to diagnose and monitor H. pylori infection.  相似文献   
50.
Platelet satellitism: experimental studies   总被引:3,自引:0,他引:3  
Platelet satellitism (PS), the in vitro phenomenon of platelets rosetting about nonlymphocytic leukocytes, is an uncommon and poorly understood finding reported in the ethylenediaminetetra-acetic acid (EDTA)-anticoagulated blood of patients with a wide variety of clinical conditions. This report presents experimental studies investigating the nature of this phenomenon by utilizing the blood of patients with platelet satellitism. Wet preparation studies and electron microscopy (transmission and scanning) demonstrated the morphologic sequences involved in the phenomenon, including eventual phagocytosis of platelets by neutrophils. The results of varying conditions such as time, temperature, and anticoagulant are described. All of five patients tested were found to have cryofibrinogenemia. Certain blood components from all of three patients tested were capable of inducing PS in normal whole blood, whereas components from normal subjects usually were not. In one patient (A), the PS-inducing capability appeared to be present in both plasma and platelets. In another patient (B) the PS-inducing capability was present in platelets (in both 1966 and 1975) and also in the cryosupernate of serum and plasma; among various antisera, antifibrinogen had the greatest ability to reduce the degree of PS in patient blood; addition of moderate amounts of CaCl2 and/or MgCl2 did not diminish the phenomenon; and two sisters and two daughters demonstrated no PS. In a third patient (C) the PS-inducing capability appeared to be largely concentrated in the cryoprecipitable fraction of plasma. These studies suggest that there are different factors in the patients' blood resulting in PS. Further studies showed PS could be induced in normal blood by adding certain nonprimate antihuman antisera (anti-IgM, antialbumin or antifibrinogen) and also by adding some preparations of normal washed platelets to the same individuals's normal whole blood. This indicates that the phenomenon of PS can be produced by factors other than those specifically present in patients with PS. Antigen-antibody complexes, either formed in vivo (mixed cryoglobulinemia) or in vitro, did not result in PS when mixed with normal blood. These and other studies suggest that PS can result from the presence of several different factors, usually proteins (in conjunction with EDTA), which probably attach to the surface of platelets apparently resulting in some alteration (such as change in surface charge) causing the platelets to be attracted to and phagocytosed by neutrophils.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号