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   41605篇
  免费   3335篇
  国内免费   1579篇
耳鼻咽喉   248篇
儿科学   800篇
妇产科学   1038篇
基础医学   1980篇
口腔科学   258篇
临床医学   3785篇
内科学   8380篇
皮肤病学   322篇
神经病学   970篇
特种医学   748篇
外国民族医学   7篇
外科学   2193篇
综合类   7279篇
现状与发展   6篇
预防医学   1987篇
眼科学   863篇
药学   10055篇
  33篇
中国医学   4728篇
肿瘤学   839篇
  2024年   82篇
  2023年   454篇
  2022年   613篇
  2021年   1270篇
  2020年   1160篇
  2019年   1065篇
  2018年   1310篇
  2017年   1419篇
  2016年   1555篇
  2015年   1437篇
  2014年   2918篇
  2013年   3332篇
  2012年   3065篇
  2011年   3219篇
  2010年   2462篇
  2009年   2174篇
  2008年   2145篇
  2007年   2170篇
  2006年   1904篇
  2005年   1655篇
  2004年   1391篇
  2003年   1255篇
  2002年   1022篇
  2001年   886篇
  2000年   736篇
  1999年   638篇
  1998年   518篇
  1997年   469篇
  1996年   368篇
  1995年   327篇
  1994年   310篇
  1993年   252篇
  1992年   220篇
  1991年   235篇
  1990年   174篇
  1989年   166篇
  1988年   173篇
  1987年   154篇
  1986年   134篇
  1985年   198篇
  1984年   180篇
  1983年   107篇
  1982年   152篇
  1981年   138篇
  1980年   139篇
  1979年   129篇
  1978年   103篇
  1977年   88篇
  1976年   75篇
  1973年   68篇
排序方式: 共有10000条查询结果,搜索用时 156 毫秒
1.
2.
3.
夏璐  唐仕敏 《现代肿瘤医学》2019,(10):1750-1753
目的:比较康莱特注射液联合紫杉醇及紫杉醇单纯化疗治疗晚期恶性胸腺瘤的不良反应和疗效。方法:2013年8月至2017年12月,经病理学和免疫组化确诊为恶性胸腺瘤并在我院肿瘤中心进行姑息性化疗的患者68例。康莱特注射液联合化疗为观察组(37例);单纯化疗为对照组(31例)。28天为一周期,共化疗4周期。结果:两组患者均无人发生过敏反应。观察组可有效减轻患者化疗不良反应:恶性、呕吐、四肢麻木、关节肌肉酸痛和白细胞下降(P<0.05),可以有效减轻患者胸闷症状和全身疼痛(P<0.05),在肿瘤控制方面,康莱特联合化疗的疗效较单纯化疗稍好,但均未见有统计学差异(P>0.05)。结论:康莱特注射液联合紫杉醇治疗晚期胸腺瘤,具有减轻患者疼痛、减轻化疗不良反应,从而提高患者化疗依从性的作用,值得临床进一步推广和研究。  相似文献   
4.
目的 按照国家计划抽验要求,评价国内不同企业生产的注射用盐酸柔红霉素的质量。方法 按国家标准检验与探索性研究相结合,对抽验样品进行检验,对检验结果进行统计分析。结果 共抽取样品17批次,按国家标准检验合格率100.0%。探索性研究对主要杂质的来源与结构进行了研究;建立溶液的澄清度检查方法;对包材相容性及稳定性进行了考察。结论 目前国内注射用盐酸柔红霉素总体质量较好;现行标准有待进一步提高,建议现行标准修订有关物质检查方法,增加特定杂质的控制,增加溶液的澄清度检查;建议企业优化生产工艺,以提高产品质量。  相似文献   
5.
6.
许玉华 《新中医》2020,52(1):66-70
目的:观察丹参川芎嗪注射液联合西药治疗对急性缺血性脑卒中患者脑组织的保护作用及对预后的影响。方法:以268例急性缺血性脑卒中患者为研究对象,按随机数字表法分为研究组和对照组各134例,2组均予西药治疗,研究组予以丹参川芎嗪注射液联合治疗,2组均随访至12周。治疗前后检测2组患者的血清炎症相关因子[超敏C-反应蛋白(hs-CRP)、肿瘤坏死因子-α(TNF-α)、白细胞介素-6 (IL-6)、白细胞介素-8 (IL-8)]、血管内皮生长因子(VEGF)、神经元特异性烯醇化酶(NSE)和S-100β水平,随访评定患者治疗12周内的美国国立卫生研究院卒中量表(NIHSS)评分和日常生活能力量表(BI)评分。结果:治疗3周,2组hs-CRP、TNF-α、IL-6和IL-8水平均低于入院时(P<0.01);研究组各因子水平均低于对照组(P<0.01)。2组血清NSE和S-100β水平均较入院时降低(P<0.01),而VEGF水平较入院时升高(P<0.01)。研究组血清NSE和S-100β水平均低于对照组,VEGF水平高于对照组,差异均有统计学意义(P<0.01)。2组治疗后一时间点的NIHSS评分均低于同组治疗前一时间点(P<0.01),而2组治疗后一时间点的BI评分均高于同组治疗前一时间点水平(P<0.01)。治疗6周和12周,研究组的NIHSS评分均低于对照组(P<0.01),而BI评分均高于对照组(P<0.01)。结论:丹参川芎嗪注射液联合西药治疗可以有效减轻急性缺血性脑卒中患者的血管炎症反应程度、血管内皮细胞和脑组织的损伤程度,促进大脑神经细胞修复,提高患者卒中后的生活能力,防止卒中后肢体发生功能障碍,改善患者预后。  相似文献   
7.
Purpose:To evaluate the rate of compliance and the reasons for loss to follow-up in Indian patients with diabetic macular edema (DME), age-related macular degeneration (AMD), and retinal vein occlusion (RVO) being treated with anti-vascular endothelial growth factor (VEGF) therapy.Methods:This was a retrospective single-center study. Patients with DME, AMD, or RVO were eligible if they initiated anti-VEGF therapy between January 2013 and December 2017. Patients'' data were obtained from hospital electronic records, including the number of injections received, visits, details of follow-up, missed appointments, and reasons for loss to follow-up (>365 days).Results:A total of 648 patients were eligible for the study, of which 334 (51.54%) patients were lost to follow-up. Overall, 343 (64.96%) were males and the overall mean (SD) age was 66.40 (7.44) years. A total of 376 (58.0%) patients had a history of diabetes and 364 (56.2%) patients had a history of hypertension. Further, 127 (38.0), 112 (33.5), and 95 (28.4) had DME, AMD, and RVO, respectively and were lost to follow-up. The most commonly reported reason for loss to follow-up was “non-affordability” (n = 120; 41.1%) followed by “no improvement in vision” (n = 83; 28.4%). “No improvement in vision” (42.2%) and “non-affordability” (37.5%) were higher among patients with DME. No association was found in gender- and treatment-wise distribution of reasons for loss to follow-up.Conclusion:The results showed that around half of the patients with DME, AMD, and RVO were lost to follow-up to intravitreal anti-VEGF therapy, and the most common factors were “non-affordability” and “no improvement in vision.”  相似文献   
8.
9.
Objective: Longitudinal data on cardiometabolic effects of egg intake during adolescence are lacking. The current analyses aim to evaluate the impact of usual adolescent egg consumption on lipid levels, fasting glucose, and insulin resistance during late adolescence (age 17–20?years).

Methods: Data from 1392 girls, aged 9 to 10 at baseline and followed for 10?years, in the National Heart, Lung, and Blood Institute’s National Growth and Health Study were used to examine the association between usual egg intake alone and in combination with other healthy lifestyle factors and late adolescent lipid levels, fasting glucose, and insulin resistance, measured as homeostasis model assessment of insulin resistance (HOMA-IR). Diet was assessed using 3-day food records during eight examination cycles. Girls were classified according to usual weekly egg intake, ages 9–17?years:?<1 egg/wk (n?=?361), 1 to <3 eggs/wk (n?=?703), and ≥3 eggs/wk (n?=?328). Analysis of covariance modeling was used to control for confounding by other behavioral and biological risk factors.

Results: Girls with low, moderate, and high egg intakes had adjusted low-density lipoprotein cholesterol levels of 99.7, 98.8, and 95.5 mg/dL, respectively (p?=?0.0778). In combination with higher intakes of fiber, dairy, or fruits and vegetables, these beneficial effects were stronger and statistically significant. There was no evidence that ≥3 eggs/wk had an adverse effect on lipids, glucose, or HOMA-IR. More active girls who consumed ≥3 eggs/wk had the lowest levels of insulin resistance.

Conclusion: These results suggest that eggs may be included as part of a healthy adolescent diet without adverse effects on glucose, lipid levels, or insulin resistance.  相似文献   

10.
In the present review, we updated current information on the chemistry, contents, and anticancer properties of matrine (MT), oxymatrine (OMT), and compound Kushen injection (CKI). The anticancer properties were focused on lung, breast, and liver cancer cells because they are most susceptible. Sources of information were from Google, Google Scholar, PubMed, PubMed Central, Science Direct, PubChem, J-Stage, Directory of Open Access Journals (DOAJ), and China National Knowledge Infrastructure (CNKI). Reference was also made on botanical websites, such as Flora of China and World Flora Online. MT and OMT are dominant quinolizidine alkaloids from the roots of Sophora flavescens (Kushen) of the family Fabaceae. Against lung, breast, and liver cancer cells, MT and OMT inhibit cell proliferation; induce cell cycle arrest, apoptosis, and autophagy; restrict angiogenesis; and inhibit cell metastasis, invasion, and migration. The processes involve various molecular targets and signaling pathways. CKI is a traditional Chinese medicine (TCM) composed of root extracts of S. flavescens and Smilax glabra (Baituling) of the family Smilacaceae. With MT and OMT as major components, CKI has been approved for the treatment of cancer in China more than 20 years ago. In recent years, systematic reviews and meta-analysis have been undertaken to evaluate the anticancer effects of CKI. When CKI is used alone and in combination with chemotherapy of western medicine, there is much to be learned concerning their interactions besides their individual and integrated efficacy. Some perspectives of MT, OMT, and CKI are discussed, and their suggestions for future research are provided.  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