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   6888篇
  免费   406篇
  国内免费   23篇
耳鼻咽喉   98篇
儿科学   626篇
妇产科学   116篇
基础医学   858篇
口腔科学   132篇
临床医学   441篇
内科学   1421篇
皮肤病学   304篇
神经病学   349篇
特种医学   326篇
外科学   672篇
综合类   181篇
一般理论   3篇
预防医学   403篇
眼科学   245篇
药学   564篇
中国医学   24篇
肿瘤学   554篇
  2023年   50篇
  2022年   123篇
  2021年   227篇
  2020年   164篇
  2019年   193篇
  2018年   222篇
  2017年   141篇
  2016年   163篇
  2015年   176篇
  2014年   297篇
  2013年   335篇
  2012年   460篇
  2011年   442篇
  2010年   271篇
  2009年   215篇
  2008年   305篇
  2007年   315篇
  2006年   301篇
  2005年   280篇
  2004年   256篇
  2003年   219篇
  2002年   195篇
  2001年   148篇
  2000年   125篇
  1999年   120篇
  1998年   70篇
  1997年   42篇
  1996年   48篇
  1995年   33篇
  1994年   44篇
  1993年   41篇
  1992年   87篇
  1991年   93篇
  1990年   96篇
  1989年   84篇
  1988年   71篇
  1987年   81篇
  1986年   60篇
  1985年   61篇
  1984年   65篇
  1983年   47篇
  1982年   64篇
  1981年   75篇
  1980年   72篇
  1979年   55篇
  1978年   33篇
  1977年   26篇
  1976年   34篇
  1973年   31篇
  1970年   26篇
排序方式: 共有7317条查询结果,搜索用时 15 毫秒
101.
An unusual case of Holt-Oram syndrome with arachnodactyly, high arch palate, thoracic scoliosis and hypoplasia of the left radial artery is reported. The relevant literature is discussed and the importance of vascular hypoplasia in genesis and localization of the skeletal deformities of this syndrome is stressed.  相似文献   
102.
Food allergy is an immune provocation induced by certain food in susceptible individuals. Most of the food allergic manifestations are evident in the individual having impaired oral tolerance. In spite of worldwide prevalence, there is no permanent cure of food allergy. Food allergic reactions are complex immunological events that comprises of several immune molecules like IgE, IL-4, IL-13 and T-cells, therefore, researchers are trying to pick the correct molecule to find out pivotal therapeutic solutions. Being a key regulatory molecule in suppressing T-cells functional activities, cytotoxic T-cell lymphocyte antigen-4 (CTLA-4) or cluster of differentiation-152 (CD-152) has contributed a novel and revolutionary dimension toward therapeutic research of several diseases. This review focuses on different immunological and mechanistic perspectives of CTLA-4 in correlation with food allergy.  相似文献   
103.
104.
Manchanda  Smita  Semalti  Kapil  Bhalla  Ashu Seith  Thakar  Alok  Sikka  Kapil  Verma  Hitesh 《Emergency radiology》2021,28(6):1063-1072
Emergency Radiology - COVID-19 patients have been found to have an increased incidence of superadded fungal infections because of multiple factors such as impaired cell-mediated immunity,...  相似文献   
105.
106.
107.
Cranioplasty may be necessary after decompressive craniectomies to aid in the restoration of the esthetic, morphological, functional, and psychosocial stability of those affected. This clinical report describes the management of a comatose road traffic accident victim with a history of autogenous cranial implant failure after decompressive craniectomy. The challenges posed by the nonambulatory state of the patient and his inability to follow commands were overcome by using reverse engineering and rapid prototyping to fabricate a 3D patient-specific polymethylmethacrylate cranial implant. A digital evaluation technique with grids as measuring tools was successfully implemented in the patient’s absence. The use of a custom clamp flask aided in the accommodation and subsequent investing, dewaxing, and polymerization of the carved cranial wax pattern. As a result, a custom cranioplast with optimum marginal fit, acceptable contour, adequate thickness, and reduced surgical duration of placement was obtained through a successful combination of conventional and digital techniques.  相似文献   
108.
IntroductionExamining the evolution of research parameters helps scientists to discover the well-developed and neglected aspects of knowledge. Pain after root canal treatment is a health problem affecting millions of patients. Research in this field has a meaningful impact on quality of lives. The aim of this study was to analyze the evolution of research on postoperative pain over the past 50 years.MethodsElectronic searches were performed in Scopus and MEDLINE databases to identify studies on pain after nonsurgical root canal treatments/retreatments. The full texts of eligible articles were reviewed to determine the study category and to extract and analyze the methodological variables. A series of statistical analyses were performed to determine the trend of publications based on the variable of interest over time.ResultsFour hundred twenty-four articles were included. There was a positive trend for systematic reviews, studies with sample size <200, studies on single-visit treatment, and clinical trials on instrumentation and adjunct treatments (P < .05). There was a negative trend for the use of numeric rating scales, studies on multiple-visit treatments, clinical trials on medication/medicament, and studies on pain in maxillary incisors (P < .05). No trend was observed based on pulpal diagnosis or for studies with longer observation periods (>8 weeks) (P > .05).ConclusionsA paradigm shift is needed toward clinical studies with larger sample sizes, longer observation periods, and more focus on pulpal diagnoses associated with higher rates of postoperative pain. There is a need to view postoperative pain as an important patient-centered outcome and to develop and disseminate standard reporting guidelines for future studies.  相似文献   
109.
Some of the industries that discharge highly colored effluents are paper and pulp mills, textiles and dye-making industries, alcohol distilleries, and leather industries. Terrestrial white-rot basidiomycetous fungi and their lignin-degrading enzymes laccase, manganese-peroxidase and lignin peroxidases are useful in the treatment of colored industrial effluents and other xenobiotics. Free mycelia, mycelial pellets, immobilized fungi or their lignin-degrading enzymes from terrestrial fungi have been reported in treatment of several effluents. Marine obligate or facultative (marine-derived) fungi may have unique properties but have not been explored sufficiently for this purpose. This article presents a critical review of bioremediation potential of such fungi and their lignin-degrading enzymes in comparison with the state-of-the-art in terrestrial white-rot fungi.  相似文献   
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