全文获取类型
收费全文 | 22095篇 |
免费 | 6575篇 |
国内免费 | 110篇 |
专业分类
耳鼻咽喉 | 344篇 |
儿科学 | 541篇 |
妇产科学 | 570篇 |
基础医学 | 1232篇 |
口腔科学 | 1519篇 |
临床医学 | 6523篇 |
内科学 | 5389篇 |
皮肤病学 | 806篇 |
神经病学 | 2734篇 |
特种医学 | 638篇 |
外科学 | 2694篇 |
综合类 | 32篇 |
现状与发展 | 2篇 |
一般理论 | 2篇 |
预防医学 | 2815篇 |
眼科学 | 358篇 |
药学 | 527篇 |
中国医学 | 25篇 |
肿瘤学 | 2029篇 |
出版年
2024年 | 146篇 |
2023年 | 1330篇 |
2022年 | 333篇 |
2021年 | 845篇 |
2020年 | 1221篇 |
2019年 | 611篇 |
2018年 | 1642篇 |
2017年 | 1739篇 |
2016年 | 1741篇 |
2015年 | 1818篇 |
2014年 | 2104篇 |
2013年 | 2085篇 |
2012年 | 1066篇 |
2011年 | 1156篇 |
2010年 | 1346篇 |
2009年 | 1668篇 |
2008年 | 896篇 |
2007年 | 694篇 |
2006年 | 850篇 |
2005年 | 610篇 |
2004年 | 536篇 |
2003年 | 483篇 |
2002年 | 440篇 |
2001年 | 325篇 |
2000年 | 172篇 |
1999年 | 284篇 |
1998年 | 337篇 |
1997年 | 352篇 |
1996年 | 340篇 |
1995年 | 297篇 |
1994年 | 193篇 |
1993年 | 178篇 |
1992年 | 132篇 |
1991年 | 106篇 |
1990年 | 87篇 |
1989年 | 113篇 |
1988年 | 91篇 |
1987年 | 65篇 |
1986年 | 57篇 |
1985年 | 59篇 |
1984年 | 44篇 |
1983年 | 33篇 |
1982年 | 25篇 |
1981年 | 24篇 |
1980年 | 19篇 |
1979年 | 10篇 |
1978年 | 13篇 |
1977年 | 14篇 |
1976年 | 8篇 |
1971年 | 9篇 |
排序方式: 共有10000条查询结果,搜索用时 218 毫秒
91.
Migraine is 3 times more common in postpubertal women than in men. Migraine is frequently exacerbated perimenstrually and commonly occurs exclusively at that time. It is often benefited by pregnancy and menopause. Estrogen withdrawal has been implicated as a mechanism for triggering migraines. The mechanism, however, is not well understood. Reproductive steroids have neuroactive properties that can modulate neuronal morphology and physiology. Increasing evidence suggests that circulating reproductive steroid levels regulate the balance of neuroexcitatory and neuroinhibitory activities in some brain regions by influencing synaptic plasticity. Estrogen has neuroexcitatory, whereas progesterone has neuroinhibitory, effects in most preclinical and clinical models. Several neurotransmitter systems that are implicated in migraine vary with reproductive steroid levels during the reproductive cycle. Estrogen stabilization may provide effective treatment in susceptible women, especially for catamenially exacerbated migraine. 相似文献
92.
M.M. Bialoskurski MA RN RM C.L. Cox MSc PhD RN & R.D. Wiggins PhD 《Journal of advanced nursing》2002,37(1):62-69
AIM: The aim of this study was to investigate the nature and organization of maternal needs and priorities in a neonatal unit. BACKGROUND: The relationship between maternal needs and priorities appears to be an under studied area in neonatal nursing. METHODS: A quantitative survey was carried out based on 209 mothers with premature infants. Two self-assessment schedules were used: critical care maternal needs inventory (J. Leske, Heart and Lung 15, 27-42) and a ranking scale. The data were analysed with multivariate analysis. FINDINGS: Data analysis revealed clear priorities in maternal needs. In particular the need for accurate infant related information was a priority for 93% of the mothers. Good communication practices with professionals were also valued. The mothers displayed altruistic behaviour, and self-related needs took second place. It is proposed that maternal needs demonstrate a hierarchical organization. CONCLUSION: It is important for nurses to consider the individual needs of the mothers, simply because the satisfaction of these needs is essential for maternal well-being. 相似文献
93.
94.
Antonio Amoroso Pierluigi Garzia Marta Vadacca Sara Galluzzo Flavia Del Porto Anna P Mitterhofer Antonella Afeltra 《The Journal of adolescent health》2003,32(1):94-97
We report on a 26-year-old female affected by Noonan syndrome (NS), a congenital disorder characterized by various phenotypic features and congenital anomalies) associated with a variety of autoimmune diseases, including systemic lupus erythematosus, celiac disease, and Hashimoto thyroiditis. Autoimmunity is seldom described in NS and the association between this congenital disease and three autoimmune disorders has not been previously reported. Should the occurrence of autoimmune disorders in NS be confirmed, a relevant clinical and laboratory evaluation of NS patients should be performed in order to clarify whether the immune system involvement represents only an occasional event or is a feature of the disease. 相似文献
95.
Martien T. Muller MA PhD Loes Pijnenborg MD PhD Bregje D. Onwuteaka-Philipsen MSc Gerrit van der Wal MD PhD Jacques Th.M. van Eijk MA PhD 《Journal of advanced nursing》1997,26(2):424-430
The researchers wanted to obtain insight into the cooperation between physicians and nurses with regard to active euthanasia and physician-assisted suicide (EAS). In study I a stratified random sample of 203 clinical specialists, 152 general practitioners (GPs) and 50 nursing home physicians (NHPs) participated. In study II a random sample of 521 GPs was drawn from the province of North Holland and a random sample of 521 GPs was drawn from the rest of the Netherlands. For study III all NHPs were approached. Data were collected by means of an interview in study I. In studies II and III an anonymous, postal questionnaire was used. Approximately half of the GPs did not consult with nurses about a patient's request for EAS, the intention to administer EAS, and the actual administration. In 5% of cases, the NHPs and the specialists did not consult with nurses concerning these aspects. The GPs and NHPs indicated in 4% and 3% of the cases, respectively, that nurses administered the lethal drug(s) to the patients; the corresponding figure for the specialists was 21%. Almost all GPs and NHPs and about three-quarters of the specialists thought that nurses should never be allowed to administer EAS. 相似文献
96.
97.
Jill Macleod Clark PhD BSc RGN Jill Maben MSc BA RGN Karen Jones BA RHV RGN 《Journal of advanced nursing》1997,26(1):161-168
This is the first of two papers which address aspects of the findings of a large scale study commissioned by the English National Board which set out to examine the impact of Project 2000 on perceptions of the philosophy and practice of nursing. The findings presented here suggest that there have been fundamental shifts in perceptions of the nature and discipline of nursing. Students and diplomates of the course perceive themselves as knowledgeable doers, with their practice well grounded in theory and research. They value the interpersonal skills teaching and place the patient firmly at the centre of care delivery, viewing the patient holistically and being prepared to be fierce patient advocates where necessary. It is difficult to determine the extent to which these shifts can be attributed to the Project 2000 course, although the Project 2000 approach to education appears to be an important factor. 相似文献
98.
Patrick Callaghan RN BSc MSc Cheung Siu Shan RN BN Lau Suk Yu RN BN Lo Wai Ching RN BN Tsui Lai Kwan RN BN 《Journal of advanced nursing》1997,26(1):33-40
This study investigated whether previous contact with mental illness affected the attitudes to mental illness (AMI) of general student nurses in Hong Kong — the contact hypothesis. We employed a quasi-experimental design. We compared the attitudes to mental illness of students who had previous contact with mental illness through having taken a psychiatric secondment with those who had not taken a psychiatric secondment. Also, we compared the AMI of: students who had taken other courses related to mental illness with those who had not; those who had a family history of mental illness with those who had not; and those who lived with a mentally ill relative with those who did not. We found that previous contact with mental illness had no significant effect on the attitudes to mental illness of the students. In other words our findings do not support the contact hypothesis. Our sample expressed positive general attitudes to mental illness when presented with general issues about mental illness. However, their attitudes were less positive when presented with specific issues about mental illness that might impinge upon their daily lives. We discuss the implications of these findings for mental health nursing practice, education and research. 相似文献
99.
100.