全文获取类型
收费全文 | 32195篇 |
免费 | 2084篇 |
国内免费 | 72篇 |
专业分类
耳鼻咽喉 | 212篇 |
儿科学 | 1056篇 |
妇产科学 | 978篇 |
基础医学 | 4093篇 |
口腔科学 | 457篇 |
临床医学 | 4405篇 |
内科学 | 6606篇 |
皮肤病学 | 402篇 |
神经病学 | 3175篇 |
特种医学 | 737篇 |
外科学 | 2969篇 |
综合类 | 471篇 |
一般理论 | 36篇 |
预防医学 | 4227篇 |
眼科学 | 369篇 |
药学 | 2059篇 |
中国医学 | 69篇 |
肿瘤学 | 2030篇 |
出版年
2023年 | 158篇 |
2022年 | 230篇 |
2021年 | 579篇 |
2020年 | 347篇 |
2019年 | 620篇 |
2018年 | 800篇 |
2017年 | 571篇 |
2016年 | 611篇 |
2015年 | 696篇 |
2014年 | 964篇 |
2013年 | 1493篇 |
2012年 | 2166篇 |
2011年 | 2286篇 |
2010年 | 1283篇 |
2009年 | 1167篇 |
2008年 | 2146篇 |
2007年 | 2213篇 |
2006年 | 2145篇 |
2005年 | 2195篇 |
2004年 | 2106篇 |
2003年 | 2070篇 |
2002年 | 1964篇 |
2001年 | 431篇 |
2000年 | 487篇 |
1999年 | 425篇 |
1998年 | 355篇 |
1997年 | 281篇 |
1996年 | 233篇 |
1995年 | 245篇 |
1994年 | 232篇 |
1993年 | 209篇 |
1992年 | 234篇 |
1991年 | 196篇 |
1990年 | 169篇 |
1989年 | 179篇 |
1988年 | 151篇 |
1987年 | 148篇 |
1986年 | 120篇 |
1985年 | 117篇 |
1984年 | 137篇 |
1983年 | 102篇 |
1982年 | 147篇 |
1981年 | 130篇 |
1980年 | 118篇 |
1979年 | 83篇 |
1978年 | 93篇 |
1977年 | 67篇 |
1976年 | 75篇 |
1975年 | 44篇 |
1974年 | 54篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
Critical care nurses, ethical decision-making and stress 总被引:2,自引:0,他引:2
Considerable attention has focused on describing ethical issues that critical care nurses face in their practice; however, less attention has been directed at describing the process of ethical decision-making. Systematic research linking aspects of ethical-decision making and stress is lacking. This cross-sectional study examines the relationship between selected aspects of ethical decision-making, stress and selected nurse characteristics. Sixty-one critical care nurses completed the Nurse's Ethical Decision Making—ICU Questionnaire and the Health Professions Stress Inventory. Findings revealed that nurses who selected the patient advocacy model had significantly higher nurse autonomy scores, that perceived anxiety had a negative association with nurse autonomy, and that workplace restrictions and stress were related. 相似文献
82.
83.
84.
P Férnandez-Calle J A Molina F J Jiménez-Jiménez A Vázquez M Pondal P J García-Ruiz D G Urra J Domingo R Codoceo 《Neurology》1992,42(5):1064-1066
To elucidate the possible role of vitamin E in the pathogenesis of Parkinson's disease (PD), we compared serum levels of alpha-tocopherol (vitamin E), measured by high-performance liquid chromatography, and the vitamin E/cholesterol ratio of 42 Parkinson's disease (PD) patients using their spouses as the control group. The serum levels of vitamin E did not differ significantly between the groups (13.84 +/- 0.56 micrograms/ml for PD and 14.80 +/- 0.57 micrograms/ml for controls), nor did the vitamin E/cholesterol ratio (0.64 +/- 0.03 for both groups). There was no influence of antiparkinsonian therapy on vitamin E or the vitamin E/cholesterol ratio. Serum levels of the vitamin E and vitamin E/cholesterol ratio did not correlate with age, age at onset, scores of the Unified Parkinson's Disease Rating Scale or the Hoehn and Yahr staging in the PD group. These results suggest that serum vitamin E concentrations do not play a role in the pathogenesis of PD. 相似文献
85.
INTRODUCTION: Farming is a dangerous occupation and results in injuries not only to farm workers, but also to families living on farms. Children raised on a farm are at particular risk because the farm is a place where they live, play, and work. Farming is the main Amish occupation, and because Amish farming techniques differ from those used on other us farms, it is important that health care providers recognize the causes of injuries that may occur on Amish farms. However, little is documented about farm-related injuries in Amish children, so we decided to document the incidence and nature of these injuries in Pennsylvania. METHODS: This study was done by reviewing the die botschaft, a weekly newspaper written by the Amish. All references to farm-related injuries among children in Pennsylvania were recorded. RESULTS: During a 5-month period, a total of 89 injuries, including 5 fatalities, were found: male children sustained 64 injuries, and female children sustained 25 injuries. Falls were the most commonly reported mechanism of injury, followed by incidents involving livestock. Both types of events most often resulted in an orthopedic injury. DISCUSSION: Injury to children in the Amish community is a significant problem that needs to be addressed and evaluated by the Amish themselves and in coordination with other health care providers, including emergency nurses. With the information obtained in this study, injury prevention strategies tailored to the Amish way of farming could be developed and implemented. 相似文献
86.
87.
88.
Job ending among youth and adults with severe mental illness 总被引:1,自引:0,他引:1
This study examined job leaving over a 36-month period among 326 persons (74 youth and 252 adults) with severe mental illness who were participating in an urban vocational rehabilitation program. Data from 627 job endings indicated that younger clients displayed job-ending patterns that were different in some aspects from such patterns for nondisabled youth (such as displaying a lower average job tenure) yet similar to job-ending patterns for nonhandicapped youth in other ways (such as displaying a high frequency of job changing). Youth and their adult counterparts with mental illness displayed similar tenure on agency-sponsored placements but significantly different tenure on independent jobs. While adults held their independent jobs for an average of seven months, youth averaged only three months at competitive employment. Youth also were significantly more likely than adults to be fired from both placements and independent jobs. These findings and others are discussed in terms of their implications for development of public policy and service delivery models for providing on-going job support to youth and adults with severe psychiatric disabilities. 相似文献
89.
Judith A. MacNaughton Mohan L. Bangah' Philip I. McCloudt Henry G. Burger 《Clinical endocrinology》1991,35(4):341-346
OBJECTIVE: Normal elderly men are reported to have decreased testicular function despite elevated gonadotrophin levels. We wished therefore to determine if changes in testicular function occur over the age range 19-60 years. DESIGN: Single fasting blood samples were obtained between 0800 and 0900 h. PATIENTS: Working men in a large industrial company between the ages of 19 and 60 years participated in the study. MEASUREMENTS: FSH, serum immunoreactive inhibin and total testosterone were measured, the latter two as measurements of Sertoli and Leydig cell function respectively. RESULTS: The mean baseline serum immunoreactive inhibin level was significantly lower in men from the older age groups, 31-40 years (479 U/l), 41-50 years (439 U/l) and 51-60 years (415 U/l) than in men from the youngest age group, 21-30 years (613 U/l) while serum FSH was higher in men from the older age groups, 41-50 years (3.7 IU/l) and 51-60 years (6.1 IU/l) than in men from the youngest age group, 21-30 years (2.6 IU/l). There appears to be a change in both FSH and inhibin production, consistent with a primary decline in testicular function. There was no significant difference in testosterone levels between the older age group, age 51-60 years and the younger age group, age 21-30 years. However, testosterone levels were significantly lower in the 41-50 year age group, when compared with the 21-30 year, this significance levelling out at about age 45 years. CONCLUSION: The data are consistent with the hypothesis that immunoreactive inhibin reflects inhibin bioactivity, and that inhibin plays a role in the feedback control of FSH secretion in men. 相似文献
90.