全文获取类型
收费全文 | 19401篇 |
免费 | 1379篇 |
国内免费 | 20篇 |
专业分类
耳鼻咽喉 | 160篇 |
儿科学 | 477篇 |
妇产科学 | 690篇 |
基础医学 | 2294篇 |
口腔科学 | 211篇 |
临床医学 | 2719篇 |
内科学 | 4129篇 |
皮肤病学 | 283篇 |
神经病学 | 1823篇 |
特种医学 | 488篇 |
外国民族医学 | 1篇 |
外科学 | 2089篇 |
综合类 | 257篇 |
一般理论 | 21篇 |
预防医学 | 2440篇 |
眼科学 | 473篇 |
药学 | 1085篇 |
中国医学 | 5篇 |
肿瘤学 | 1155篇 |
出版年
2023年 | 104篇 |
2022年 | 172篇 |
2021年 | 367篇 |
2020年 | 240篇 |
2019年 | 410篇 |
2018年 | 459篇 |
2017年 | 292篇 |
2016年 | 342篇 |
2015年 | 346篇 |
2014年 | 565篇 |
2013年 | 812篇 |
2012年 | 1187篇 |
2011年 | 1193篇 |
2010年 | 670篇 |
2009年 | 622篇 |
2008年 | 1028篇 |
2007年 | 1194篇 |
2006年 | 1092篇 |
2005年 | 1104篇 |
2004年 | 1023篇 |
2003年 | 1021篇 |
2002年 | 918篇 |
2001年 | 365篇 |
2000年 | 367篇 |
1999年 | 344篇 |
1998年 | 219篇 |
1997年 | 163篇 |
1996年 | 178篇 |
1995年 | 126篇 |
1994年 | 132篇 |
1993年 | 117篇 |
1992年 | 202篇 |
1991年 | 189篇 |
1990年 | 246篇 |
1989年 | 214篇 |
1988年 | 207篇 |
1987年 | 191篇 |
1986年 | 205篇 |
1985年 | 183篇 |
1984年 | 137篇 |
1983年 | 138篇 |
1982年 | 127篇 |
1981年 | 92篇 |
1980年 | 108篇 |
1979年 | 154篇 |
1978年 | 112篇 |
1977年 | 94篇 |
1976年 | 90篇 |
1975年 | 84篇 |
1972年 | 83篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
103.
The Y-maze was used to examine the effects of purines acting at A1 and A2 adenosine receptors upon spontaneous alternation, a model of working memory, in mice. In support of previous work, scopolamine produced a loss of spontaneous alternation behaviour to the 0.5 chance level. The A1 receptor selective agonist N6-cyclopentyladenosine (CPA) did not change spontaneous alternation behaviour alone, but it prevented the decrease of spontaneous alternation scores produced by scopolamine. The A1 receptor selective antagonist 1,3-dipropyl-8-cyclopentylxanthine (CPX) blocked the effect of CPA in combination with scopolamine but had no effect alone. The A2 receptor selective agonist (N6-[2-(3,5-dimethoxyphenyl)-2-(2-methylphenyl)ethyl]adenosine (DPMA), and the A2 receptor selective antagonist 3,7-dimethyl-1-propargylxanthine (DMPX) had no effect of alternation behaviour alone and did not modify the effect of scopolamine. The results indicate the ability of A1 but not A2 receptor activation to modify working memory deficits induced by scopolamine, but suggest that endogenous adenosine does not normally participate in working memory processes. 相似文献
104.
105.
The Barthel Index (BI), the Modified Barthel Index (MBI) and the Functional Independence Measure (FIM) are all widely used by occupational therapists as assessment tools for clinical decision-making and outcome measurement. All of these tools have demonstrated validity and the BI and the FIM have demonstrated inter-rater reliability. The MBI has been modified to increase sensitivity; however, there have been no publications on the inter-rater reliability of this tool following the changes. The purpose of this research was to examine the inter-rater reliability of two versions of the Barthel Index, and draw some comparisons between this assessment tool and the FIM. Twenty-five patients with neurological and orthopaedic conditions were assessed by three occupational therapists using the three tools. The method of analysis selected was percentage agreement and intraclass correlation coefficient. The results indicated that both the original and modified versions of the Barthel Index possess good inter-rater reliability. As all three tools have demonstrated adequate reliability and validity, it is suggested that clinicians select the most sensitive tool that best meets their clinical needs, and use this assessment tool in its standardized format. 相似文献
106.
Ezer Kang Bruce D. Rapkin Carolyn Springer Jen Haejin Kim 《Journal of immigrant and minority health / Center for Minority Public Health》2003,5(2):49-58
Access to and utilization of care for HIV-positive Asians (A) and Pacific Islanders (PI) have been largely unaddressed despite the rising influx of immigrants from Asia and the Pacific to the United States and the growing HIV prevalence in these regions. This paper describes the cultural attitudes, behaviors, and perceptions that affect access to and utilization of care among Asian undocumented noncitizens living with HIV/AIDS (UNWHA) in New York City. Sixteen semistructured interviews with HIV-positive UNWHAs revealed that their access to care was influenced by community misperceptions of HIV transmission, discriminatory attitudes towards persons living with HIV, competing immigration related stressors, and difficulty navigating service systems. These findings underscore the importance of integrating HIV treatment with primary prevention and awareness of immigration-related stressors to ensure timely access to screening services and care among Asian UNWHAs. 相似文献
107.
Phil Tibbo C J de Gara Treena M Blake Carolyn Steinberg Brian Stonehocker 《Revue canadienne de psychiatrie》2002,47(6):562-567
OBJECTIVE: To examine the perceptions of intimidation in the psychiatric educational environment in Edmonton, Alberta. METHODS: We distributed a 7-point modified Likert scale questionnaire that included questions with respect to intimidation perceptions and experience in psychiatry during a 1-week period to all student interns on psychiatry rotations, residents, and teaching faculty in the 5 teaching hospitals in Edmonton. RESULTS: A total of 92 individuals responded, with response rates of 81% for faculty, 82% for residents, and 84% for students. Response rates did not differ among sites. While there were differences between site and group with respect to comparing the perceived intimidation in psychiatry with other specialties, respondents did not view psychiatry as worse than other specialties. Although, overall, women perceived intimidation as more prevalent at their sites than did men, the overall means reflect sites that are relatively free from intimidation. Faculty and student interns within sites, except for the university hospital, tended to disagree on management's approach to perceived intimidation. All groups, however, reported little personal experience and felt their sites had little tolerance for intimidators. CONCLUSIONS: Reported perceptions and personal experiences of intimidation within the psychiatric learning environment in Edmonton are low. 相似文献
108.
109.
One-hundred consecutive patients were prospectively evaluated on admission to our Brain Injury Unit for signs and symptoms of reflex sympathetic dystrophy (RSD) in the upper extremity. Patients averaged 4 months postinjury and had an average age of 29 years. Thirteen patients had clinical signs and symptoms of RSD and were then evaluated with standard radiographs and 3-phase radionuclide scintigraphy. Twelve of 13 patients had 3-phase bone scans (TPBS) consistent with RSD (12% overall incidence). RSD was present exclusively in the spastic upper extremity. There were 9 patients with hemiparesis and 3 with quadraparesis. There was a significantly higher (P < 0.01) incidence of associated upper extremity injury in the group with RSD (75%). All patients had a mean Rancho Cognitive Level of V and initial Glasgow Coma Scores less than 8. Patients who developed RSD had lower Glasgow Coma Scores than the non-RSD patients. Brain-injured patients often display agitation, hyperalgesia, disuse or neglect of the RSD-involved extremity. In addition, these patients are often cognitively unable to vocalize complaints of pain. Undiagnosed RSD in these patients can result in a significant delay in rehabilitation and possible loss of the use of an otherwise functional upper extremity. 相似文献
110.
1. Working adults exercise as much as the rest of society. 2. The amount of physical activity declines with age until 55, at which point increases were observed. 3. Marriage appears to have the largest effect on reducing the amount of physical activity a person gets. 4. Males are 1 1/2 times more likely than females to be vigorously active. 相似文献