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   19298篇
  免费   2025篇
  国内免费   481篇
耳鼻咽喉   56篇
儿科学   252篇
妇产科学   352篇
基础医学   2379篇
口腔科学   189篇
临床医学   2359篇
内科学   3453篇
皮肤病学   242篇
神经病学   3643篇
特种医学   678篇
外国民族医学   4篇
外科学   964篇
综合类   1925篇
预防医学   1081篇
眼科学   249篇
药学   1381篇
  5篇
中国医学   357篇
肿瘤学   2235篇
  2024年   22篇
  2023年   303篇
  2022年   317篇
  2021年   661篇
  2020年   744篇
  2019年   772篇
  2018年   708篇
  2017年   822篇
  2016年   755篇
  2015年   767篇
  2014年   1075篇
  2013年   1563篇
  2012年   981篇
  2011年   1057篇
  2010年   859篇
  2009年   912篇
  2008年   893篇
  2007年   952篇
  2006年   796篇
  2005年   760篇
  2004年   660篇
  2003年   634篇
  2002年   500篇
  2001年   482篇
  2000年   384篇
  1999年   329篇
  1998年   338篇
  1997年   291篇
  1996年   280篇
  1995年   283篇
  1994年   215篇
  1993年   178篇
  1992年   165篇
  1991年   140篇
  1990年   127篇
  1989年   115篇
  1988年   93篇
  1987年   95篇
  1986年   95篇
  1985年   124篇
  1984年   120篇
  1983年   83篇
  1982年   83篇
  1981年   76篇
  1980年   75篇
  1979年   41篇
  1978年   23篇
  1977年   14篇
  1976年   16篇
  1975年   10篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
We report on a woman with a an 8-year history of multiple system atrophy with predominance of parkinsonism who developed jaw-locking oromandibular dystonia within hours after insertion of ill-fitting dentures. Dystonia spread rapidly to involve other facial muscles and the larynx causing stridor with respiratory failure necessitating crush intubation.  相似文献   
82.
83.
The aim of the study was to determine the prevalence of thyroid autoimmune disorders in a cohort of untreated multiple sclerosis (MS) patients and compare it with a stratified sample of an adult population. We prospectively studied 93 untreated MS patients. The control group included 401 healthy subjects selected by stratified sampling in a non-iodine-deficient area. Antithyroid antibodies (ATA) (antibodies against peroxidase and thyroglobulin) were considered positive at titres ≥149 IU/ml. Antibodies were positive in 11 MS patients (11.8%; 95% CI 5.3–18.4%). This prevalence was five times higher ( P  = 0.0001) when compared with that in the control population. We found six cases with subclinical hypothyroidism (6.45%; 95% CI 11.4–1.5) in contrast to 2.24% in the control group. Comparing MS with positive and negative ATA, there was a non-significant, slightly higher frequency of low Expanded Disability Status Scale (EDSS) score in the ATA-positive group (81% vs. 73.2%). One year after start of interferon (IFN) treatment, only one patient developed subclinical thyroid dysfunction. MS patients have a higher prevalence of ATA compared with the general population. An initial ATA and thyroid-stimulating hormone (TSH) determination is recommended in all MS patients. A periodic assessment of thyroid function during IFN treatment only seems to be justified in those cases where positive ATA or dysfunction is present before treatment.  相似文献   
84.
目的:探讨反应停治疗难治性多发性骨髓瘤(MM)的临床疗效。方法:对6例难治疗性多发性骨髓瘤应用反应停治疗后的临床资料进行分析,并结合文献复习,为该病的治疗提供一条思路。结果:1例患者达完全缓解;1例患者达部分缓解;1例进步,血清M蛋白减少35%、骨痛明显减轻、血沉降低40%、血红蛋白上升20g/L;2例无效;1例死亡。结论:反应停对多发性骨髓瘤有较好的疗效,不良反应可以耐受且不产生骨髓抑制:抗血管新生是其主要疗效机制。  相似文献   
85.
A phase II trial of fludarabine phosphate using a bolus and continuous infusion regimen in previously treated multiple myeloma was performed. No responses were observed in eleven patients. There was no significant non-hematologic toxicity noted. Fludarabine phosphate is inactive in multiple myeloma using this schedule.  相似文献   
86.
本文设计了一种心脏冠脉狭窄程度的客观评估方法,并自行开发了工具软件对图像数据进行自动处理和计算。此后,本文采用该方法对四组心脏动态体模冠脉狭窄成像的数据进行了分析,对该客观评估方法各方面的特性进行了检验和评定。  相似文献   
87.
Bone marrow aspirates from 20 patients with multiple myeloma (MM), 4 with smoldering multiple myeloma (S-MM), 1 with idiopathic Bence Jones proteinuria (I-BJP), and 6 with primary macroglobulinemia (PMG) were examined for nucleolus-associated J chain. The incidence of nucleolar J chain-positive (J+) cells among nucleolated cells producing M-component was measured. This incidence (94.0-100%) in terminal MM was significantly higher than that (0-58.0%) in non-terminal MM. Judging from a low incidence in the remission phase, chemotherapy might cause a selective elimination of less differentiated myeloma cells with J+ nucleoli and might have some effect on J chain synthesis. The incidence of nucleolar J+ cells was very low in S-MM. The IgM cells in PMG, where J chain is present in a disulfide-linked form, had no or few J+ nucleoli. No correlation between the incidence of nucleolar J+ cells among nucleolated plasma cells and the percentage of nucleolated cells or that of J+ cells was found. Large J+ nucleoli seemed to be another morphological feature indicating anaplastic myeloma cells. A high incidence of nucleolar J+ cells may be one of the indicators for progressive disease.  相似文献   
88.
Free amino acid concentrations of CSF were measured in bacterial meningitis, aseptic meningitis, meningoradiculitis Garin-Bujadoux-Bannwarth, multiple sclerosis, carcinomatous meningitis, and controls. Almost all CSF amino acids were highly elevated in bacterial but not in aseptic meningitis, meningoradiculitis Garin-Bujadoux-Bannwarth or carcinomatous meningitis thus providing a laboratory tool for their differential diagnosis. In carcinomatous meningitis the amino acid pattern indicates metabolic activity of tumor cells. Minimal alterations were found in multiple sclerosis which have no diagnostic value.  相似文献   
89.
90.
We describe the pattern and progression of atrophy delineated using fluid registration of serial magnetic resonance imaging scans in a case of multiple system atrophy (MSA). The in vivo findings were consistent with those found at postmortem, including significant supratentorial atrophy concurrent with an unusual degree of cognitive impairment for MSA.  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