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   33305篇
  免费   2332篇
  国内免费   55篇
耳鼻咽喉   304篇
儿科学   1190篇
妇产科学   972篇
基础医学   4282篇
口腔科学   436篇
临床医学   4357篇
内科学   5986篇
皮肤病学   472篇
神经病学   3560篇
特种医学   603篇
外国民族医学   4篇
外科学   2977篇
综合类   329篇
一般理论   45篇
预防医学   4632篇
眼科学   507篇
药学   2216篇
中国医学   23篇
肿瘤学   2797篇
  2024年   61篇
  2023年   293篇
  2022年   518篇
  2021年   1121篇
  2020年   683篇
  2019年   1038篇
  2018年   1159篇
  2017年   833篇
  2016年   980篇
  2015年   1008篇
  2014年   1336篇
  2013年   1874篇
  2012年   2739篇
  2011年   2967篇
  2010年   1551篇
  2009年   1300篇
  2008年   2380篇
  2007年   2378篇
  2006年   2182篇
  2005年   2049篇
  2004年   1830篇
  2003年   1578篇
  2002年   1596篇
  2001年   207篇
  2000年   172篇
  1999年   204篇
  1998年   307篇
  1997年   238篇
  1996年   169篇
  1995年   179篇
  1994年   135篇
  1993年   119篇
  1992年   71篇
  1991年   47篇
  1990年   51篇
  1989年   45篇
  1988年   44篇
  1987年   36篇
  1986年   33篇
  1985年   16篇
  1984年   19篇
  1983年   29篇
  1982年   24篇
  1981年   18篇
  1980年   11篇
  1977年   6篇
  1976年   6篇
  1974年   6篇
  1973年   7篇
  1942年   4篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
The role of mid-treatment monitoring dual-energy X-ray absorptiometry–bone mineral density (DXA-BMD) for bisphosphonate-treated patients with osteoporosis remains unsettled. A common reason for such monitoring is to encourage ongoing medication adherence. We sought to determine if a DXA-BMD treatment monitoring test was associated with improved medication adherence and whether improved adherence after a DXA-BMD treatment monitoring test was associated with subsequent reduction in fracture rates. Using linked administrative databases within Manitoba, Canada, we performed a retrospective cohort study of women starting and continuing antiresorptive therapy in whom a mid-treatment DXA-BMD monitoring test was performed. From the provincial pharmacy database, we estimated medication adherence by calculating annual medication possession ratio (MPR) and determining the change in MPR with respect to change (stable/decrease) in the DXA-BMD monitoring test, in addition to fracture rates before and after the test. The cohort comprised 3418 women, 90.7% treated with oral bisphosphonate, with pharmacy data for the 3 years before and after the mid-treatment DXA-BMD. Median (interquartile range) MPR was 0.84 (0.49–0.99) in the year before DXA-BMD and 0.84 (0.48–0.99) in the year after DXA-BMD (p = 0.37). Among those whose DXA-BMD declined, MPR in the prior year was 0.54 (0.04–0.92) but improved to 0.70 (0.31–0.92) in the year after DXA-BMD (p < 0.001). Among those whose DXA-BMD monitoring test was stable/improved, the fracture rate before the monitoring DXA-BMD was 10.1 per 1000 person-years and in those whose DXA-BMD monitoring test showed a decrease, the rate was 23.7 per 1000 person-years (p < 0.001). Despite improved adherence in those with DXA-BMD decline, the post DXA-BMD fracture rate was 22.4 per 1000 person-years versus 12.9 per 1000 person-years in those who had stable DXA-BMD (p < 0.001). A mid-treatment DXA-BMD reassessment strategy may be useful to focus attention upon adherence, but for optimal fracture outcomes, treatment adherence should be specifically addressed at the commencement of therapy. © 2021 American Society for Bone and Mineral Research (ASBMR).  相似文献   
103.
104.
105.

Because the public health response to the disproportionate HIV burden faced by Black sexual minority men (BSMMM) has focused on sexual risk reduction and disease prevention, other vital components of sexual health (e.g., intimacy, pleasure, benefits of sex) have been often overlooked. Sex-positive describes a more open, holistic approach toward sex and sexuality that prioritizes these other components, though such an approach is rarely applied to BSMM's sexual health. For sex-positive BSMM, risk/preventive discourse may foster or exacerbate medical mistrust as a reaction to the dissonance between how these men view sexual health and how the medical establishment views it, which may discourage sexual healthcare-seeking. We assessed sex-positivity and its association with medical mistrust and PrEP conspiracy beliefs among 206 HIV-negative cisgender BSMM in Atlanta, Georgia. We performed exploratory factor analytic procedures on responses to a sex-positivity scale, followed by multivariable linear regressions to determine sex-positivity’s associations with medical mistrust and PrEP conspiracy beliefs. We extracted two sex-positivity factors: sexual freedom (α?=?0.90), reflecting openness toward casual sex and rejection of sexual mores, and essence of sex (α?=?0.77), reflecting the intimate, relational, and pleasurable qualities of sex. Sexual freedom was independently associated with perceived provider deception (β?=?0.19, CI?=?0.04, 0.34). Essence of sex was independently associated with PrEP conspiracy beliefs (β?=?0.16, CI?=?0.02, 0.31) and marginally associated with perceived provider deception (β?=?0.14, CI?=???0.00, 0.29). Healthcare providers and public health practitioners may cultivate greater trust with BSMM by incorporating a sex-positive approach into patient/participant interactions, clinical decision-making, and interventions. Improving access to sexual pleasure acknowledges BSMM’s right to optimal, holistic sexual health.

  相似文献   
106.

Establishing communicative and behavioral boundaries in romantic relationships provides partners with a greater sense of relational stability and certainty. For romantic relationships, these boundaries, such as sexual exclusivity, are relatively straightforward. For casual sex relationships, however, the relational rules are less stable and certain. This exploratory study examined rules in friends with benefits relationships (FWBRs) for 109 college students in the USA. Responses to open-ended questions were collected through an online questionnaire, and data were qualitatively analyzed through an inductive thematic analysis. The data were structured into communication rules, sexual rules, and relational definition rules. Results provide overlap and extension of previous work investigating rules in FWBRs. Notably, participants reported sexual exclusivity as an important rule. Additionally, potentially competing discourses in FWBR rules were best understood through the lens of relational dialectics. Findings reflect a tension in terms of relational work, as partners struggle with maintaining their sexual and friendship relationship while not falling into the “territory” of romantic relationships.

  相似文献   
107.
Intraductal carcinoma (IDC) is a rare salivary gland tumor that is considered analogous to ductal carcinoma in-situ of the breast, demonstrating a complex neoplastic epithelial proliferation surrounded by a continuous layer of presumed non-neoplastic myoepithelial cells. It is subcategorized into intercalated duct, apocrine, and hybrid subtypes based on morphologic and immunohistochemical features, with frequent NCOA4-RET and TRIM27-RET fusions, respectively, seen in intercalated duct and hybrid tumors. However, as an expanding clinicopathologic spectrum of IDC has been documented, controversy has emerged as to whether this tumor type is best defined by its intraductal growth pattern or distinctive molecular and immunophenotypic differentiation. Here, we further explore the nature of IDC by evaluating four cases that arose within intraparotid lymph nodes. These intercalated-duct phenotype tumors with diffuse S100 protein expression demonstrated a crowded and complex epithelial proliferation arranged in cystic, cribriform, and micropapillary architecture, surrounded by an intact myoepithelial cell layer, and were completely intranodal. Of two tumors with tissue available for molecular analysis, one demonstrated a NCOA4-RET fusion and one harbored a STRN-ALK fusion that is novel to IDC. Not only does the intranodal presence of IDC present a challenging differential diagnosis, but the complex nature of this proliferation within lymph node tissue raises questions as to whether the myoepithelial component of IDC is actually non-neoplastic in nature. Furthermore, identification of a STRN-ALK fusion expands the genetic spectrum of IDC and adds to evidence of an emerging role for ALK in salivary gland tumors. Further attention to the nature of the myoepithelial cells and documentation of alternate fusion events in IDC may inform continued discussion about its appropriate classification.  相似文献   
108.
Archives of Sexual Behavior - Sex during adolescence is normative; however, there are substantial individual differences in the timing and context of sexual debut. Leisure boredom is an...  相似文献   
109.
110.
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