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   3146篇
  免费   202篇
  国内免费   12篇
耳鼻咽喉   9篇
儿科学   117篇
妇产科学   38篇
基础医学   507篇
口腔科学   33篇
临床医学   270篇
内科学   523篇
皮肤病学   163篇
神经病学   358篇
特种医学   147篇
外科学   282篇
综合类   8篇
一般理论   1篇
预防医学   217篇
眼科学   91篇
药学   295篇
中国医学   6篇
肿瘤学   295篇
  2023年   23篇
  2022年   39篇
  2021年   65篇
  2020年   48篇
  2019年   64篇
  2018年   77篇
  2017年   61篇
  2016年   90篇
  2015年   89篇
  2014年   111篇
  2013年   144篇
  2012年   227篇
  2011年   259篇
  2010年   150篇
  2009年   132篇
  2008年   242篇
  2007年   217篇
  2006年   215篇
  2005年   230篇
  2004年   196篇
  2003年   177篇
  2002年   140篇
  2001年   31篇
  2000年   12篇
  1999年   16篇
  1998年   34篇
  1997年   32篇
  1996年   24篇
  1995年   12篇
  1994年   18篇
  1993年   18篇
  1992年   6篇
  1991年   5篇
  1990年   8篇
  1989年   8篇
  1988年   10篇
  1987年   5篇
  1986年   7篇
  1985年   8篇
  1984年   5篇
  1983年   10篇
  1982年   13篇
  1981年   7篇
  1980年   6篇
  1979年   12篇
  1978年   9篇
  1977年   6篇
  1976年   5篇
  1972年   5篇
  1971年   4篇
排序方式: 共有3360条查询结果,搜索用时 187 毫秒
31.
Bundesgesundheitsblatt - Gesundheitsforschung - Gesundheitsschutz - Die zeitliche Befristung der Projekte partizipativer Gesundheitsforschung (PGF) erschwert es, die angestrebten konkreten...  相似文献   
32.
Objectives: When perinatal medicine emerged as a new medical discipline in the 1960s, Berlin was as one of the world's leading centers. During that time, the city was separated into two parts, each fostering its own health care system. After the destruction of the Berlin Wall, it was possible to speak with the citizens of East Berlin and to access their database systems. This created the singular opportunity to objectively compare the development of perinatal care in both parts of Berlin. Methods: Rates of maternal, perinatal, and infant mortality as well as the rate of preterm deliveries were evaluated over time and between East and West Berlin. The timing of introduction of 20 specific perinatal interventions was evaluated across 18 hospitals with more than 500 deliveries (11 in West Berlin and 7 in East Berlin). Interviews were conducted with 100 gynecologists, 100 midwives, and 100 women who had recently delivered their first child from each side of the city regarding their opinions of the importance of these interventions for the quality of perinatal medicine and how they would distribute a budget to improve maternity care. Results: Maternal, perinatal, and infant mortality decreased in both parts of Berlin until 1990 (p<0.0001), without significant differences between East and West Berlin, though the preterm delivery rate was slightly lower in East Berlin compared with West Berlin (p<0.06). Some new clinical techniques and treatments—such as cardiotocography, ultrasound, tocolytic therapy, and peridural anesthesia—were introduced earlier in West Berlin. In contrast, certain public health measures—such as maternal transport, screening programs for diabetes, and support of breastfeeding—were introduced much earlier in East Berlin. There were significant differences between the beliefs of gynecologists, midwives, and mothers in East and West Berlin. In general, citizens of East Berlin were more enthusiastic about technological medical advances, whereas citizens of West Berlin were more supportive of public health and alternative methods. In addition, there were significant differences between female and male physicians in their beliefs about how to improve health care, regardless of whether they resided in East or West Berlin. Conclusions: The results of this study may serve as a basis for reflection on how different social circumstances and health care policies can influence the improvement of maternal and child health care.  相似文献   
33.
Overcoming dendritic cell (DC) dysfunction is a prerequisite for successful active immunotherapy against breast cancer. CD40 ligand (CD40L), a key molecule in the interface between T-lymphocytes and DCs, seems to be instrumental in achieving that goal. Commenting on our data that CD40L protects circulating DCs from apoptosis induced by breast tumor products, Lenahan and Avigan highlighted the potential of CD40L for immunotherapy. We expand on that argument by pointing to additional findings that CD40L not only rescues genuine DCs but also functionally improves populations of immature antigen-presenting cells that fill the DC compartment in patients with breast cancer.  相似文献   
34.
Using nebulization, only a small proportion of the dose reaches the lungs, while the remainder is swallowed, exhaled into the atmosphere, or remains in the nebulizer. It was the purpose of this study to investigate whether wearing a noseclip during inhalation can improve lung deposition. Relative lung deposition was compared by inhalation of the marker substance, sodium cromoglycate (SCG), and measurement of urinary excretion of SCG. The SCG absorption half-life allows one to differentiate indirectly between a more or less peripheral deposition. Ten CF patients (9-18 years old) inhaled, under routine conditions, a solution containing 20 mg of SCG in a randomized crossover design through a mouthpiece, without and with a noseclip being worn. Following inhalation without and with a noseclip, no statistically significant difference was seen in the amount of SCG excreted in urine (0.9 +/- 0.4 mg vs. 1.0 +/- 0.5 mg; p = 0.402) and absorption half-life (93 +/- 25 min vs. 113 +/- 36 min; p = 0.083). In conclusion, wearing a noseclip during inhalation under conditions relevant to practice does not increase the amount deposited into the lungs of CF patients and, also, there has been no indication of a more peripheral lung deposition.  相似文献   
35.
36.
37.
38.
39.
Botulinum toxin A (BoNT-A) is considered a safe and effective therapy for children with cerebral palsy (CP), especially in the hands of experienced injectors and for the majority of children. Recently, some risks have been noted for children with Gross Motor Classification Scale (GMFCS) of IV and the risks are substantial for level V. Recommendations for treatment with BoNT-A have been published since 1993, with continuous optimisation and development of new treatment concepts. This leads to modifications in the clinical decision making process, indications, injection techniques, assessments, and evaluations. This article summarises the state of the art of BoNT-A treatment in children with CP, based mainly on the literature and expert opinions by an international paediatric orthopaedic user group. BoNT-A is an important part of multimodal management, to support motor development and improve function when the targeted management of spasticity in specific muscle groups is clinically indicated. Individualised assessment and treatment are essential, and should be part of an integrated approach chosen to support the achievement of motor milestones. To this end, goals should be set for both the long term and for each injection cycle. The correct choice of target muscles is also important; not all spastic muscles need to be injected. A more focused approach needs to be established to improve function and motor development, and to prevent adverse compensations and contractures. Furthermore, the timeline of BoNT-A treatment extends from infancy to adulthood, and treatment should take into account the change in indications with age.  相似文献   
40.
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