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   41087篇
  免费   2908篇
  国内免费   1575篇
耳鼻咽喉   253篇
儿科学   896篇
妇产科学   629篇
基础医学   4582篇
口腔科学   913篇
临床医学   4604篇
内科学   6079篇
皮肤病学   1532篇
神经病学   1533篇
特种医学   893篇
外国民族医学   8篇
外科学   2236篇
综合类   6099篇
现状与发展   5篇
一般理论   1篇
预防医学   2632篇
眼科学   550篇
药学   8620篇
  73篇
中国医学   1366篇
肿瘤学   2066篇
  2024年   109篇
  2023年   784篇
  2022年   1178篇
  2021年   1784篇
  2020年   1669篇
  2019年   1396篇
  2018年   1259篇
  2017年   1218篇
  2016年   1156篇
  2015年   1227篇
  2014年   2329篇
  2013年   2369篇
  2012年   2205篇
  2011年   2493篇
  2010年   2162篇
  2009年   1861篇
  2008年   1924篇
  2007年   2076篇
  2006年   1739篇
  2005年   1791篇
  2004年   1442篇
  2003年   1400篇
  2002年   1175篇
  2001年   1076篇
  2000年   971篇
  1999年   899篇
  1998年   831篇
  1997年   756篇
  1996年   607篇
  1995年   630篇
  1994年   552篇
  1993年   410篇
  1992年   382篇
  1991年   293篇
  1990年   198篇
  1989年   144篇
  1988年   133篇
  1987年   129篇
  1986年   103篇
  1985年   107篇
  1984年   108篇
  1983年   90篇
  1982年   85篇
  1981年   74篇
  1980年   52篇
  1979年   41篇
  1978年   25篇
  1977年   44篇
  1976年   37篇
  1973年   13篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
Flavocoxid (Limbrel), a proprietary mixture of flavonoid molecules (baicalin and catechin), was tested against a traditional nonsteroidal anti-inflammatory drug, naproxen, for the management of the signs and symptoms of moderate osteoarthritis (OA) in humans. Discomfort and global disease activity were used as the primary end points, and safety assessments were also taken for both treatments as a secondary endpoint. In this double-blind study, 103 subjects were randomly assigned to receive either flavocoxid [500 mg twice daily (BID)] or naproxen (500 mg BID) in a 1-month onset of action trial. Outcome measures included the short Western Ontario and McMaster University Osteoarthritis Index, subject Visual Analogue Scale for discomfort and global response, and investigator Visual Analogue Scale for global response and fecal occult blood. Both flavocoxid and naproxen showed significant reduction in the signs and symptoms of knee OA (P ≤ .001). There were no statistically detectable differences between the flavocoxid and naproxen groups with respect to any of the outcome variables. Similarly, there were no statistically detectable differences between the groups with respect to any adverse event, although there was a trend toward a higher incidence of edema and nonspecific musculoskeletal discomfort in the naproxen group. In this short-term pilot study, flavocoxid was as effective as naproxen in controlling the signs and symptoms of OA of the knee and would present a safe and effective option for those individuals on traditional nonsteroidal anti-inflammatory drugs or cyclooxygenase-2 inhibitors. A low incidence of adverse events was reported for both groups.  相似文献   
82.
Nocturnal Sleep‐Related Eating Disorder (NSRED) is a well‐documented sleeping disorder where the person is reported to experience bizarre eating behavior during sleep. Although various causes are implicated in this disorder, role of drugs cannot be ruled out. Here we narrate an interesting rare case report of a drug‐induced new onset NSRED, where a 45‐year‐old man on zolipdem performed an unexpected and bizarre eating behavior during somnambulistic state, type of which has not been reported earlier in the literature. The case falls under even rarer category as such behavior in sleep is reported mainly in woman. © 2008 by Wiley Periodicals, Inc. Int J Eat Disord 2009  相似文献   
83.
We report the case of a 25-year-old male patient who presented with complaints of redness, photophobia, and decreased vision in the right eye of a week's duration. Slit-lamp biomicroscopic examination revealed a cream-colored, irregular elevated inferior iris mass, extending on to the anterior lens surface. Differential diagnoses of a fungal granuloma, a medulloepithelioma, and an amelanotic melanoma were considered. An excisional biopsy of the mass was performed through a superior clear corneal incision. Polymerase chain reaction analysis of the aqueous humor showed a positive pan fungal genome. Histopathology of the biopsied mass showed a giant cell granuloma with surrounding numerous branching, septate hyphae. Culture growth revealed Aspergillus fumigatus We report this case because of the rarity of Aspergillus iris granuloma as a primary presentation of endogenous Aspergillosis and review the relevant literature. Absence of a significant systemic history compounded the diagnostic dilemma in our patient. Definitive differentiation of this rare entity from a foreign body, amelanotic melanoma, and other inflammatory conditions such as sarcoidosis and tuberculosis, may be possible only on microbiological and histo-pathological evaluation.  相似文献   
84.
85.
目的 观察免费板式组合药在DOTS中对合并乙肝的涂阳肺结核病人肝损害情况。方法 比较HBsAg、HBeAg、HBcAb阳性的涂阳肺结核病人与无乙肝的涂阳肺结核病人DOTS前后肝功能损害情况。结果 合并乙肝病人肝损害发生率66.3%,无乙肝者肝损害发生率8.6%,两者相比差异有显著性(P〈0.01)。22.5%病人因肝损害需更改治疗方案。结论 DOTS中合并乙肝的病人采用板式组合药用2H3R3Z3E3/4H3R3方案易发生肝损害,对这类病人应慎用常规方案,并要密切全程观察肝功能,尽可能应用肝损害较小的抗结核药。  相似文献   
86.
87.
[背景]观察抗结核药物的不良反应.[病例报告]对293例应用抗结核药物后出现不良反应的患者资料进行分析,抗结核药物常见不良反应的有肝脏损害、胃肠道反应、听力障碍及关节痛等.[讨论]应依据患者的具体情况,选择不同的抗结核药物进行联合应用.  相似文献   
88.
OBJECTIVES: Vesicoureteral reflux (VUR) is the most common congenital urinary tract anomaly. This disease can pose a major threat to the kidneys as twenty percent of patients with endstage renal disease are reported to have VUR. Although genetic studies for uroplakin III (UPIII) have been reported recently, no study has focused on UPIII gene expression in VUR patients. We describe here the up-regulation of UPIII mRNA in exfoliated urinary cells from primary VUR patients. METHODS: A real-time RT-PCR for UPIII mRNA was performed on exfoliated urothelial cells from 18 primary VUR and 38 control samples. UPIII mRNA copies were calculated for each sample. The statistical differences were assessed by the Mann-Whitney U test. Receiver operator characteristic curves were constructed for analysis of the diagnostic values. RESULTS: UPIII mRNA was found to be up-regulated to a greater extent in VUR than in control exfoliated urinary cells (mean +/- SE: 497.0 +/- 178.5 copies vs. 69.0 +/- 10.0 copies, respectively, P < 0.001). In evaluating the measurement of urinary UPIII mRNA as a screening test for VUR, the sensitivity was 77.8% and the specificity was 76.3% by the best diagnostic cutoff point. CONCLUSIONS: This is the first report demonstrating up-regulation of UPIII in mRNA levels in VUR patients. We submit that the quantitative measurement of urinary UPIII mRNA has a potential of developing into the first non-invasive screening test for VUR.  相似文献   
89.
Abstract Over the past 15–20 years, research has progressively focused on the mucosal T cell as the central factor in the initiation of physiological or pathological changes, first in the growth and maturation of the early (postnatal) intestine, and second in adult-type enteropathies resulting from sensitivity to either food or pathogen-derived antigens. T cell-mediated events may be measured, for example, in terms of specific immunopathologic patterns of change and injury, such as type 1 (lymphocyte infiltration), type 2 (crypt hyperplasia) and type 3 (flat-destructive), which can be recognized and quantitated microscopically; by determination of lymphocyte reactivity through secretion of interleukin-2 receptors (IL-2R) into plasma or expression by mucosal lymphocytes; by quantitation of lymphocyte subsets emigrating into inflamed tissues by immunoperoxidase-labelled monoclonal antibodies; or by the determination of T cell receptor polymorphisms. Alterations in intestinal growth, structure and function at weaning are likely to be T cell-mediated as they are analogous to the same type 1/2 lesions that reflect modulation of adult mucosal architecture in food and parasite-induced hypersensitivity reactions. Enteropathies associated with HIV infection and T cell deficiency display a milder degree of villous flattening and impaired crypt hyperplasia than that typical of gluten-sensitivity, suggesting a reversion to lesser degrees of mucosal pathology (type 1/2). Clearly more information will accrue; meanwhile the remarks in this brief survey should provide a firm basis whereby clinician and scientist can meet, and together recognize and further dissect the modulatory effect of T lymphocytes on mucosal structure and function.  相似文献   
90.
干扰素治疗病毒性肝炎120例的不良反应监察与分析   总被引:4,自引:0,他引:4  
本文对120例慢性乙型和丙型病毒性肝炎患者使用干扰素治疗的不良反应进行系统监察。结果表明:发生流感样症状占70.8%,外周血象异常者39.2%,ALT一过性增高占18.3%,肾肠道反应7.1%,其它还有皮疹(2例),轻度脱发(2例),血糖升高(2例)等。不同年龄组出现药物不良反应的比例有一定差异,老年患者明显低于儿童和成年人组。  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