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   1280篇
  免费   67篇
  国内免费   2篇
耳鼻咽喉   17篇
儿科学   92篇
妇产科学   15篇
基础医学   120篇
口腔科学   66篇
临床医学   76篇
内科学   140篇
皮肤病学   8篇
神经病学   59篇
特种医学   47篇
外科学   150篇
综合类   34篇
一般理论   1篇
预防医学   75篇
眼科学   79篇
药学   208篇
中国医学   15篇
肿瘤学   147篇
  2023年   10篇
  2022年   28篇
  2021年   37篇
  2020年   28篇
  2019年   22篇
  2018年   33篇
  2017年   24篇
  2016年   25篇
  2015年   22篇
  2014年   49篇
  2013年   51篇
  2012年   85篇
  2011年   100篇
  2010年   41篇
  2009年   42篇
  2008年   44篇
  2007年   50篇
  2006年   60篇
  2005年   48篇
  2004年   68篇
  2003年   64篇
  2002年   47篇
  2001年   50篇
  2000年   37篇
  1999年   18篇
  1998年   11篇
  1997年   5篇
  1996年   9篇
  1995年   7篇
  1992年   7篇
  1991年   11篇
  1990年   8篇
  1989年   13篇
  1988年   14篇
  1987年   24篇
  1986年   21篇
  1985年   15篇
  1984年   10篇
  1979年   6篇
  1978年   4篇
  1977年   8篇
  1976年   8篇
  1975年   9篇
  1974年   13篇
  1973年   8篇
  1972年   10篇
  1971年   5篇
  1970年   5篇
  1969年   5篇
  1968年   8篇
排序方式: 共有1349条查询结果,搜索用时 0 毫秒
21.
Abstract

Background: Natural opiate users constitute a large proportion of opioid dependent individuals in India, and enjoy socio-cultural sanction in certain parts of the country. However, no study has assessed the pathways to care among this population in India.

Objective: To assess the pathways to care among treatment-seeking natural opiate dependent individuals.

Method: This cross sectional, explorative study was conducted at a tertiary care drug treatment centre located in North India. A total of 125 male participants aged >18?years, seeking treatment for natural opiate dependence from our outpatient clinic were included. A semi-structured proforma and WHO mental health encounter form was applied to assess socio-demographic, treatment details and pathways to care.

Results: The mean age was 46.17 (±11.98) years. Poppy husk (phukki/doda/posht) was the most common primary natural opiate used (84%). First point of treatment contact was addiction psychiatrist (n?=?90; 72%) in majority. First time treatment seeking was either by self-referral (60.8%) or referral by relatives and friends (24.8%) with mean time lag of 18.63?years after the onset.

Conclusion: Natural opiates dependent patients seek treatment late in the course of their illness, often directly from a tertiary addiction treatment centre. Barriers to seek treatment needs to be addressed.  相似文献   
22.
Reconstructing maxillary defects can be challenging. In particular, Class 3 and 4 defects require careful planning.3 Bone for reconstruction must be placed in the correct three dimensional (3D) position in order to achieve a good cosmetic and functional result. Correct size and positioning of the harvested bone also enables placement of dental implants and allows rehabilitation.  相似文献   
23.
Emery-Dreifuss muscular dystrophy (EDMD) is an inherited disorder affecting skeletal and cardiac muscles and characterized by muscular atrophy, contractures, and cardiomyopathy with conduction defects. It can be X-linked or autosomal. Not all patients with EDMD develop heart involvement, but heart disease associated with EDMD can be unpredictable and may be life threatening. In rare cases heart problems may be the first symptom of EDMD. Early recognition of heart involvement is of utmost importance as placement of a pacemaker and/or defibrillator may be lifesaving.  相似文献   
24.
25.
26.
OBJECTIVE: The International Agency for Research on Cancer (IARC) has classified formaldehyde as carcinogenic to humans, leaving the dental profession to look for viable substitutes to formocresol in the vital pulpotomy technique. This study was designed to examine the attitudes and practices of Community Dental Service (CDS) staff in Wales in relation to vital pulpotomy for primary molars 18 months following the IARC's press release. METHODS: The study employed a postal questionnaire. RESULTS: Questionnaires were returned by 79 (78.2%) of the CDS staff surveyed, yielding a sample of 65 dentists practising the technique. The most commonly used pulpotomy agents were formocresol, paraformaldehyde and ferric sulphate. Twenty-seven (41.5%) dentists expressed concern regarding their preferred pulpotomy agent and 17 (26.2%) were considering changing their technique. Only one respondent (1.5% of the sample) routinely took preoperative radiographs; follow-up radiographs were routinely taken by only three dentists (4.6%). Only 44 respondents (67.7%) always used local anaesthesia for this form of treatment. Amalgam was the most commonly used restorative material. Twenty-two respondents (33.8%) stated that they would pulp treat a primary molar on more than one occasion. CONCLUSIONS: The results of this study suggest that there is need for relevant continuing professional development courses for CDS staff in Wales.  相似文献   
27.
28.
29.
Cutaneous T-cell lymphomas (CTCLs) arise from specific molecular aberrations that lead to uncontrolled cell proliferation. RNA interference (RNAi) with short interfering RNAs (siRNAs) is a feasible approach to interrupt aberrant signal processing in CTCL cells, but functional biomaterial carriers are needed to effectively deliver siRNAs intracellularly. Towards this goal, we explored the utility of lipid-substituted polyethylenimines (PEI) carriers in a cell model of CTCL. Using caprylic and linoleic acid substituted 2 kDa PEI (PEI-CA and PEI-LA, respectively), we showed effective delivery of siRNA to T-lymphocyte Hut78 and Jurkat cells, but silencing of a model protein (Green Fluorescent Protein, GFP) was possible only in the Hut78 cells. To enhance siRNA delivery to Hut78 cells, a high siRNA: carrier ratio used to assemble the complexes and centrifugation of cells in the presence of complexes were found effective. The toxicities of PEI-CA and PEI-LA were significantly lower than other commercial carriers, 25 kDa PEI and Lipofectamine® RNAiMAX. This might have contributed to reduced siRNA delivery efficiency of the latter carriers. Screening several endogenous targets led us to identify phosphatidylinositol-4,5-bisphosphate 3-kinase (PI3K) and cyclin-dependent kinase 18 (CDK18) as viable targets to induce siRNA-mediated cell growth inhibition. The results of this study identified promising polymeric carriers and molecular targets that could control proliferation of CTCL cells based on RNAi therapy.  相似文献   
30.
Intervertebral disc herniation is common condition, with majority occurring in lumbar and cervical spine. Most lumbar disk herniations occur within the spinal canal, with approximately 7%-10% identified within the foramen or extraforaminal location. Extraforaminal disc herniation in extreme lateral, retroperitoneal or anterior terms are used when disc material is seen towards anterolateral or anterior to the spine. Disc herniation in these locations is easily mistaken for an abscess or a neoplasm especially when it is not connected to the parent disc (sequestered disc). We describe a case of 60-year male who initially was misdiagnosed as psoas abscess and subjected to invasive investigation which later turned out to be histologically confirmed disc sequestration in the retroperitoneum. Thus, knowledge of this condition is essential in avoiding unnecessary workup and treatment.  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