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   343194篇
  免费   22966篇
  国内免费   7671篇
耳鼻咽喉   4075篇
儿科学   9582篇
妇产科学   6576篇
基础医学   27624篇
口腔科学   8073篇
临床医学   37633篇
内科学   42267篇
皮肤病学   4684篇
神经病学   19441篇
特种医学   7995篇
外国民族医学   31篇
外科学   36391篇
综合类   51616篇
现状与发展   12篇
一般理论   31篇
预防医学   35219篇
眼科学   5415篇
药学   31777篇
  410篇
中国医学   31547篇
肿瘤学   13432篇
  2023年   5382篇
  2022年   8218篇
  2021年   13382篇
  2020年   12517篇
  2019年   18306篇
  2018年   15986篇
  2017年   12970篇
  2016年   10426篇
  2015年   9721篇
  2014年   20227篇
  2013年   21642篇
  2012年   18626篇
  2011年   20137篇
  2010年   16107篇
  2009年   14754篇
  2008年   14402篇
  2007年   14889篇
  2006年   12949篇
  2005年   11219篇
  2004年   9160篇
  2003年   8033篇
  2002年   6258篇
  2001年   5644篇
  2000年   4673篇
  1999年   4050篇
  1998年   3288篇
  1997年   3140篇
  1996年   2710篇
  1995年   2611篇
  1994年   2511篇
  1993年   1998篇
  1992年   2034篇
  1991年   1763篇
  1990年   1557篇
  1989年   1379篇
  1988年   1312篇
  1987年   1130篇
  1985年   3807篇
  1984年   4808篇
  1983年   3345篇
  1982年   3812篇
  1981年   3555篇
  1980年   3162篇
  1979年   2907篇
  1978年   2533篇
  1977年   1908篇
  1976年   2151篇
  1975年   1633篇
  1974年   1429篇
  1973年   1278篇
排序方式: 共有10000条查询结果,搜索用时 156 毫秒
991.
介绍了一种从谷朊粉废水中提取戊聚糖的工艺,由此工艺得到的产品(戊聚糖质量分数约70%,蛋白质质量分数约20%)能较好地保持戊聚糖的特性.研究了其它添加剂(卡拉胶)对戊聚糖的乳化性,戊聚糖对肉制品持油、持水性以及其质构的影响.谷朊粉废弃水提取物与卡拉胶的复配产品在添加量(质量分数)为6%时能使肉制品有较好的持油性和相应的质构.  相似文献   
992.
本文作者比较了不同时期的纸质病案的使用率,讨论了旧病案的缺点,如难于保存,占用空间及实用价值不大.作者提出了改进保存病案的办法.  相似文献   
993.
目的 探讨提高上尿路结石碎石成功率的微创治疗方法。方法 采用经皮肾穿微造瘘输尿管镜气压弹道碎石,术中放置双J管,术后配合体外冲击波碎石术(ESWL)治疗上尿路结石48例。结果 结石总排净率为89.1%,结石最小排净率79.2%,无严重并发症发生。结论 该方法结石排净率高,创伤较小,手术并发症少,是上尿路结石较为理想的微创治疗方法。  相似文献   
994.
目的 :研究血肿厚度等因素对急性硬膜下血肿近期预后的影响。方法 :对 85例急性硬膜下血肿病人作回顾性分析 ,评价血肿厚度、术前GCS评分及瞳孔变化对急性硬膜下血肿近期预后的影响。结果 :出血厚度、术前GCS评分、瞳孔变化及对光反应对急性硬膜下血肿近期预后的影响有显著统计学意义。结论 :出血厚度、术前GCS评分、瞳孔变化及对光反应是评价急性硬膜下血肿近期预后的重要指标。  相似文献   
995.
After removal of intraductal stones, a 10‐Fr or 7‐Fr pancreatic stent was placed in 16 patients with upstream ductal dilation proximal to a stricture of the main pancreatic duct. Stents were removed after a mean duration of 52.5 days. Nine patients underwent repeated stenting. About one year after removal of the initial stent, when the remaining upstream ductal dilation was found on follow‐up pancreatograms, the next stent was replaced. Repeated stenting improved outflow of pancreatic juice more effectively than one‐time stenting. Correlation between long‐term pain relief without recurrence of intraductal stones and reduction of duct diameter was also shown. Stent occlusion was observed in 14 of 30 stents. Stent occlusion was frequently associated with recurrence of pancreatitis and intraductal stones, and was also associated with morphologic changes in the pancreatic ductal system. Although there were no significant differences between stent patency of the initial stents and that of the next stents, stent patency of 10‐Fr stents was superior to that of 7‐Fr stents. 10‐Fr stents should be removed within 8 weeks and 7‐Fr stents should be removed within 4 weeks for the prevention of stent occlusion. Repeated stenting with short‐term stenting is therefore considered a safe and effective protocol of endoscopic pancreatic stenting.  相似文献   
996.
M. Spilsbury 《Haemophilia》2004,10(S4):25-29
Summary.  This paper is based on the assumption that psychosocial services can add important mental and social dimensions to the traditional concepts of help and medicine. Peer support which has been established world-wide for people with haemophilia and their families is invaluable and irreplaceable. However the role of the professional psychosocial worker is underutilized in most countries, mostly because of lack of financial resources. This paper will argue that skilled workers can assist individuals and groups to reach their full potential in a variety of creative and non-threatening ways. Psychosocial workers have strict codes of conduct and requirements relating to accreditation to ensure accountability in their work. They can work in a variety of individual roles and have a wide range of individual mandates within work settings.  相似文献   
997.
The naevus of Ota (naevus fusculocoeruleus ophthalmomaxillaris) was first described by the Japanese dermatologist M. T. Ota in 1939. It has a reported incidence of 0.2% to 1% in the Japanese population. It usually occurs in the skin innervated by the first or second branch of the trigeminal nerve. The naevus comprises dermal melanocytes and is congenital or acquired during adolescence. Commonly associated lesions include scleral melanocytosis and other ocular manifestations as well as lesions of the tympanic membrane, oral and intranasal mucosa and leptomeninges. Diseases associated with Ota's naevus in rare cases are open-angle glaucomas and melanoma. The naevus of Ota in Europeans is a rare manifestation. We report the very rare case of a bilateral naevus of Ota associated with enoral melanocytosis in a white European person.  相似文献   
998.
Using an information-theoretic approach, causality between the systolic amplitude in blood pressure and the frequency of the heart beat was analyzed. Blood pressure and ECG were noninvasively recorded in young, healthy subjects. Three successive measurements were performed: during spontaneous breathing and during paced respiration—at frequencies both higher and lower than that of spontaneous respiration. We demonstrate that the amplitude and frequency of the cardiac rhythm are synchronized for most of the time. The synchronization is stronger during paced respiration at a frequency lower than that of spontaneous breathing. Episodes where the cardiac frequency was driven by the systolic pressure were also detected during slow, paced respiration.  相似文献   
999.
新生儿产伤79例分析   总被引:3,自引:1,他引:2  
目的了解新生儿产伤种类及相关因素.方法用回顾性分析方法对该院23年间分娩造成的新生儿产伤共79例进行分析.结果23年间共分娩25 916例次,分娩造成的新生儿产伤共79例,发生率为3.05‰.产伤类型包括:骨折、臂丛神经损伤、产钳伤、刀伤、面瘫、口底损伤,其中以骨折为最多,计33例,占41.77%,骨折中颅骨骨折所占比例最大,25例(75.76%).与产伤关系最为密切的分娩方式是产钳助产.体重≥2500 g,发生新生儿产伤71例,占89.87%.新生儿产伤Apgar评分≤7分56例,占70.89%.结论正确选择分娩方式,把新生儿产伤降到最低点.  相似文献   
1000.
血瘀证的研究发展脉络与评述   总被引:6,自引:0,他引:6  
主要从4个方面论述了血瘀证50年来研究进展.理论研究,着重从古今文献论述血瘀证定义和含义;客观研究,着重对生理、生化、血液流变学、免疫学、病理学和微循环等方面对血瘀证进行研究;血瘀证的动物模型研究,主要对血瘀证动物模型的建立与造模方法和途径进行研究;诊断标准研究,包括诊断标准、诊断指标的研究。并对上述内容进行了评述,并提出了展望。  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