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   31792篇
  免费   1960篇
  国内免费   160篇
耳鼻咽喉   278篇
儿科学   507篇
妇产科学   314篇
基础医学   4794篇
口腔科学   931篇
临床医学   3101篇
内科学   7648篇
皮肤病学   471篇
神经病学   3551篇
特种医学   1878篇
外科学   4293篇
综合类   183篇
一般理论   11篇
预防医学   1300篇
眼科学   605篇
药学   1736篇
中国医学   52篇
肿瘤学   2259篇
  2024年   28篇
  2023年   267篇
  2022年   443篇
  2021年   824篇
  2020年   512篇
  2019年   715篇
  2018年   803篇
  2017年   628篇
  2016年   886篇
  2015年   1010篇
  2014年   1261篇
  2013年   1543篇
  2012年   2531篇
  2011年   2543篇
  2010年   1526篇
  2009年   1365篇
  2008年   2238篇
  2007年   2239篇
  2006年   2160篇
  2005年   2034篇
  2004年   1774篇
  2003年   1663篇
  2002年   1567篇
  2001年   291篇
  2000年   233篇
  1999年   312篇
  1998年   328篇
  1997年   241篇
  1996年   175篇
  1995年   159篇
  1994年   127篇
  1993年   94篇
  1992年   88篇
  1991年   84篇
  1990年   74篇
  1989年   77篇
  1988年   58篇
  1987年   54篇
  1986年   50篇
  1985年   59篇
  1984年   44篇
  1983年   43篇
  1982年   43篇
  1981年   39篇
  1980年   35篇
  1978年   31篇
  1975年   31篇
  1937年   30篇
  1936年   26篇
  1935年   36篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
101.
Summary We examined 81 men exposed for a long time to carbon disulphide (CS2) and tested the possible electrocardiographic (ECG) changes of ischemic heart disease (I.H.D.). The subjects were examined twice in two years. In order to make the ECG evaluation more objective, the Minnesota Code was applied. Two obligatory ECG examinations and only one submaximal effort test were carried out. For comparative evaluation, the control group was examined once. We proved that, in spite of the accepted opinion concerning the atheromatous action of CS2, this compound does not cause ECG symptoms of I.H.D. in a higher percentage of exposed persons. It also does not cause any significant increase in I.H.D. symptoms in dynamic ECG observations.  相似文献   
102.
103.
104.
Phosphorus was imaged in vivo in human cortical and trabecular bone and the T(1) and T(2) (*) were measured. An ultrashort TE (UTE) pulse sequence (TE = 70 microm) was used with half pulse excitation and radial mapping of k-space from the center out. T(2) (*) was measured using multiple echo times and T(1) was measured both by saturation recovery and by a method using different RF pulse amplitudes. Seven normal subjects (32-85 years) were examined. Phosphorus was imaged, with a true in-plane resolution of 2.9 x 2.9 mm and a signal-to-noise ratio (SNR) of 19:1, in both cortical and trabecular bone. The mean T(2) (*) value was 207 +/- 12 micros, and the mean T(1) value was 8.6 +/- 3.0 sec. Images and measurements were obtained in realistic times on a clinical MR system. This may provide a new approach to characterizing disease of bone.  相似文献   
105.
106.
Wiener Medizinische Wochenschrift - Aggressives Tumorwachstum, frühe Metastasierung und hohe Assoziation mit intensivem Nikotinkonsum sind die Charakteristika des kleinzelligen...  相似文献   
107.
Although magnetic resonance imaging is the most accurate imaging method of evaluating the anterior cruciate ligament, several plain radiographic signs suggestive of anterior cruciate ligament injury have been described. Plain radiographs also play an important role in evaluating anterior cruciate ligament reconstruction.  相似文献   
108.
109.
Conclusion The past decade has seen extraordinary progress in the study of autosomal-dominant polycystic kidney disease. The 2 major genes for this disorder have been identified. Animal models of ADPKD have been produced. The molecular basis of the disease has been characterized. ADPKD is a “second-hit” disease, much like many cancer predisposition syndromes. This has profound implications for our understanding. The progression of ADPKD in individual patients is likely related more to their individual rate of acquisition of second hits at thePKD1 orPKD2 locus than to the inherited germ line mutation itself. Therapeutic approaches will perhaps now be considered, which will include interventions that may limit the rate at which somatic mutations occur in the kidney. The major focus of research at present is to elucidate the normal functions ofPKD1 andPKD2. Protein binding partners are being sought for both proteins. The possible calcium channel function ofPKD2 is being investigated. The downstream effects of cellular deficiency of either protein are likely to yield many clues. Modifying genetic factors that may independently affect disease progression are likely to be identified using the several mouse models. Perhaps the next decade will bring great strides in understanding and in potential therapy for this common disease. This paper was presented at the 2nd International Forum “The Frontiers of Nephrology,” Tokyo, May 10, 1998.  相似文献   
110.
The present study addressed auditory processing in 8-11-year-old children with developmental dyslexia by means of event-related brain potentials (ERP). Cortical sound reception was evaluated by recording N250 responses to syllables and tones and cortical sound discrimination by analyzing the mismatch negativity (MMN) to syllable and tone changes. We found that both cortical sound reception and sound discrimination were impaired in dyslexic children. The analysis of the data obtained from two dyslexic subgroups, Dyslexics-1 being impaired in non-word reading (or both non-word and frequent word reading) and Dyslexics-2 in frequent word reading but not in non-word reading, revealed that the MMN was specifically diminished in the latter group whereas it was normal-like in Dyslexics-1. However, no differences were found between these subgroups in sound reception as indicated by the responses elicited by the standard stimuli. These results show that different diagnostic subgroups of dyslexics have different patterns of auditory processing deficits as suggested by similarly impaired sound reception in both dyslexic groups and the sound-discrimination impairment specific to one of the groups.  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