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   684篇
  免费   50篇
  国内免费   7篇
耳鼻咽喉   4篇
儿科学   6篇
妇产科学   12篇
基础医学   137篇
口腔科学   1篇
临床医学   58篇
内科学   117篇
皮肤病学   25篇
神经病学   51篇
特种医学   32篇
外科学   146篇
综合类   9篇
一般理论   4篇
预防医学   54篇
眼科学   7篇
药学   34篇
中国医学   5篇
肿瘤学   39篇
  2023年   7篇
  2022年   17篇
  2021年   29篇
  2020年   21篇
  2019年   26篇
  2018年   24篇
  2017年   6篇
  2016年   18篇
  2015年   16篇
  2014年   30篇
  2013年   31篇
  2012年   33篇
  2011年   36篇
  2010年   22篇
  2009年   27篇
  2008年   31篇
  2007年   35篇
  2006年   26篇
  2005年   34篇
  2004年   32篇
  2003年   22篇
  2002年   18篇
  2001年   15篇
  2000年   22篇
  1999年   17篇
  1998年   5篇
  1996年   3篇
  1995年   2篇
  1994年   4篇
  1993年   3篇
  1992年   15篇
  1991年   4篇
  1990年   16篇
  1989年   8篇
  1988年   11篇
  1987年   10篇
  1986年   10篇
  1985年   10篇
  1984年   5篇
  1983年   2篇
  1982年   5篇
  1981年   2篇
  1979年   4篇
  1978年   5篇
  1974年   5篇
  1973年   4篇
  1972年   2篇
  1971年   3篇
  1970年   2篇
  1968年   1篇
排序方式: 共有741条查询结果,搜索用时 218 毫秒
91.
BACKGROUND: Women appear to be more vulnerable than men to emotional distress (ED) However, ED often goes unrecognized by family physicians. PURPOSE: To (1) assess the rate of inquiry about ED by family physicians and (2) explore the association between physician's inquiry about ED and women's satisfaction with care. METHODS: Telephone interviews were conducted in 2003 using a structured questionnaire in a representative sample of 991 Israeli women aged 22 years or older, with a response rate of 84%. RESULTS: 33% of women reported ED during the past year but only 15% of women reported having discussed ED with their family physician in the last year. Higher rates of discussion of ED with the physician were found among women who had experienced ED (22.5%), those who had a chronic illness (20.1%) had low income (22.7%), and were Arabic (29.5%) or Russian speakers (26.3%). Multivariate analysis indicated that women who had discussed ED with their physician expressed higher satisfaction with the physicians professional level (OR = 6.85), attitude (OR = 2.45), spending enough time (OR = 2.90), and listening to the patient (OR = 3.19), compared with women who had not discussed ED with their physician. CONCLUSIONS: Given the current low rates of inquiry about ED, it appears that developing sensitivity to women's emotional concerns and encouraging physicians to inquire about ED should be given higher priority in medical education at all levels. Furthermore, since inquiry about ED not only improves the appropriateness of care but is also associated with higher satisfaction with the physician, organizations in a competitive health care environment may have a particular interest in promoting this practice.  相似文献   
92.
93.
Toxoplasmosis is a life-threatening infection in immunocompromised patients (ICPs). The definitive diagnosis relies on parasite DNA detection, but little is known about the incidence and burden of disease in HIV-negative patients. A 3-year retrospective study was conducted in 15 reference laboratories from the network of the French National Reference Center for Toxoplasmosis, in order to record the frequency of Toxoplasma gondii DNA detection in ICPs and to review the molecular methods used for diagnosis and the prevention measures implemented in transplant patients. During the study period, of 31,640 PCRs performed on samples from ICPs, 610 were positive (323 patients). Blood (n = 337 samples), cerebrospinal fluid (n = 101 samples), and aqueous humor (n = 100 samples) were more frequently positive. Chemoprophylaxis schemes in transplant patients differed between centers. PCR follow-up of allogeneic hematopoietic stem cell transplant (allo-HSCT) patients was implemented in 8/15 centers. Data from 180 patients (13 centers) were further analyzed regarding clinical setting and outcome. Only 68/180 (38%) patients were HIV+; the remaining 62% consisted of 72 HSCT, 14 solid organ transplant, and 26 miscellaneous immunodeficiency patients. Cerebral toxoplasmosis and disseminated toxoplasmosis were most frequently observed in HIV and transplant patients, respectively. Of 72 allo-HSCT patients with a positive PCR result, 23 were asymptomatic; all were diagnosed in centers performing systematic blood PCR follow-up, and they received specific treatment. Overall survival of allo-HSCT patients at 2 months was better in centers with PCR follow-up than in other centers (P < 0.01). This study provides updated data on the frequency of toxoplasmosis in HIV-negative ICPs and suggests that regular PCR follow-up of allo-HSCT patients could guide preemptive treatment and improve outcome.  相似文献   
94.
95.
96.
97.
Activin A, BMP2, and BMP4, 3 members of the transforming growth factor-beta family, are involved in the regulation of hematopoiesis. Here, we explored the role of these molecules in human megakaryopoiesis using an in vitro serum-free assay. Our results highlight for the first time that, in the absence of thrombopoietin, BMP4 is able to induce CD34(+) progenitor differentiation into megakaryocytes through all stages. Although we have previously shown that activin A and BMP2 are involved in erythropoietic commitment, these molecules have no effect on human megakaryopoietic engagement and differentiation. Using signaling pathway-specific inhibitors, we show that BMP4, like thrombopoietin, exerts its effects on human megakaryopoiesis through the JAK/STAT and mTor pathways. Inhibition of the BMP signaling pathway with blocking antibodies, natural soluble inhibitors (FLRG or follistatin), or soluble BMP receptors reveals that thrombopoietin uses the BMP4 pathway to induce megakaryopoiesis, whereas the inverse is not occurring. Finally, we show that thrombopoietin up-regulates the BMP4 autocrine loop in megakaryocytic progenitors by inducing their production of BMP4 and up-regulating BMP receptor expression. In summary, this work indicates that BMP4 plays an important role in the control of human megakaryopoiesis.  相似文献   
98.
Foci of meningeal myeloid metaplasia were found in 3 of 11 consecutive autopsied patients with myelofibrosis and agnogenic myeloid metaplasia. The clinical and pathological findings in an additional seven published patients with agnogenic myeloid metaplasia who developed neurological manifestations due to pressue of hemopoietic tumors in the central nervous system are reviewed.  相似文献   
99.
Immunocompromised patients are predisposed to infections caused by influenza virus. Influenza virus may produce considerable morbidity, including protracted illness and prolonged viral shedding in these patients, thus prompting higher doses and prolonged courses of antiviral therapy. This approach may promote the emergence of resistant strains. Characterization of neuraminidase (NA) inhibitor (NAI)-resistant strains of influenza A virus is essential for documenting causes of resistance. In this study, using quantitative real-time PCR along with conventional Sanger sequencing, we identified an NAI-resistant strain of influenza A (H3N2) virus in an immunocompromised patient. In-depth analysis by deep gene sequencing revealed that various known markers of antiviral resistance, including transient R292K and Q136K substitutions and a sustained E119K (N2 numbering) substitution in the NA protein emerged during prolonged antiviral therapy. In addition, a combination of a 4-amino-acid deletion at residues 245 to 248 (Δ245-248) accompanied by the E119V substitution occurred, causing resistance to or reduced inhibition by NAIs (oseltamivir, zanamivir, and peramivir). Resistant variants within a pool of viral quasispecies arose during combined antiviral treatment. More research is needed to understand the interplay of drug resistance mutations, viral fitness, and transmission.  相似文献   
100.
The concomitant presence of two zymodemes of the leishmania infantum complex. MON-1 and MON-77, is reported in a dog with diffuse leishmaniasis. The zymodemes were present in both the skin and lymph nodes. Possible explanations for the presence of the two zymodemes are discussed.  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