全文获取类型
收费全文 | 14275篇 |
免费 | 1261篇 |
国内免费 | 438篇 |
专业分类
耳鼻咽喉 | 83篇 |
儿科学 | 111篇 |
妇产科学 | 501篇 |
基础医学 | 937篇 |
口腔科学 | 338篇 |
临床医学 | 1939篇 |
内科学 | 874篇 |
皮肤病学 | 65篇 |
神经病学 | 318篇 |
特种医学 | 539篇 |
外科学 | 784篇 |
综合类 | 2847篇 |
现状与发展 | 1篇 |
一般理论 | 5篇 |
预防医学 | 2411篇 |
眼科学 | 128篇 |
药学 | 2025篇 |
59篇 | |
中国医学 | 1768篇 |
肿瘤学 | 241篇 |
出版年
2024年 | 116篇 |
2023年 | 354篇 |
2022年 | 688篇 |
2021年 | 825篇 |
2020年 | 786篇 |
2019年 | 550篇 |
2018年 | 577篇 |
2017年 | 629篇 |
2016年 | 653篇 |
2015年 | 606篇 |
2014年 | 1179篇 |
2013年 | 1481篇 |
2012年 | 1113篇 |
2011年 | 1088篇 |
2010年 | 780篇 |
2009年 | 669篇 |
2008年 | 708篇 |
2007年 | 596篇 |
2006年 | 528篇 |
2005年 | 395篇 |
2004年 | 327篇 |
2003年 | 267篇 |
2002年 | 194篇 |
2001年 | 163篇 |
2000年 | 132篇 |
1999年 | 92篇 |
1998年 | 66篇 |
1997年 | 66篇 |
1996年 | 69篇 |
1995年 | 56篇 |
1994年 | 41篇 |
1993年 | 23篇 |
1992年 | 35篇 |
1991年 | 18篇 |
1990年 | 20篇 |
1989年 | 14篇 |
1988年 | 13篇 |
1987年 | 14篇 |
1986年 | 9篇 |
1985年 | 6篇 |
1984年 | 5篇 |
1983年 | 5篇 |
1982年 | 6篇 |
1981年 | 2篇 |
1980年 | 4篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1973年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
51.
52.
J. de Pedro-Cuesta L. Widén-Holmqvist P. Bach-y-Rita 《Acta neurologica Scandinavica》1992,86(5):433-439
In all, 22 reports of 20 randomized, controlled rehabilitation studies were evaluated. In 18 of these, the design of the trial was parallel, with a cross-over format being employed in the remaining 2 instances. Seven studies related to intensive rehabilitation during the early post-acute period. In six others, specific techniques--sometimes associated with traditional physiotherapy procedures--were compared: biofeedback, perceptual retraining, and amphetamine treatment. Eight experiments evaluated speech therapy in aphasia. Frequently, methodological considerations limited the interpretation of the results. The review showed that: 1) as regards activities of daily life and motor function, differences as between rehabilitation in stroke units on the one hand and non-rehabilitation or rehabilitation in medical wards on the other, were detected in relatively few quality studies and remained particularly inconclusive insofar as life in the home environment was concerned; 2) rehabilitation for aphasia and perceptual dysfunction proved effective for at least several months after acute stroke; 3) in general, examination of the reports cited revealed no differences in the effects of biofeedback and perceptual retraining vs conventional physiotherapy; 4) rehabilitation, whether administered by specialists or amateur caregivers purpose-trained by specialists, proved equally effective for aphasia. These conclusions constitute a valuable basis for the development and evaluation of modern rehabilitation programs for stroke patients. 相似文献
53.
54.
反义核酸技术是用人工合成的或生物合成的特定互补的DNA或RNA片段阻断从基因到蛋白的信息流 ,以达到抑制或阻断基因表达的生物新技术。利用核酸分子杂交原理将反义寡核苷酸 (antisenseoligonucleotide,ASON)作为外源性基因表达抑制物结合到靶mRNA序列上阻止其翻译成蛋白[1 ] 。具有杂交特异性和选择性调节基因的表达的特点[2 ] ,这一技术不仅已成为常用的实验室研究方法 ,还广泛的应用于研究病毒、肿瘤、寄生虫和遗传性疾病的预防和治疗 ,具有重要的应用前景。对于人类基因的研究 ,人们采用分子克隆、分子杂交、PCR技术等一系列研究… 相似文献
55.
魏红燕 《山东医学高等专科学校学报》2009,31(1)
目的 研究消渴降糖胶囊制备工艺.方法 采用高效液相色谱仪,以甲醇-0.4%磷酸溶液(60∶40)为流动相,检测波长为367 nm进行测定,记录色谱图,计算峰面积.结果 提取3 h、提取2 h与提取1 h相比,槲皮素提取率有显著增高(P<0.05),但提取3 h与提取2 h槲皮素的含量无显著性变化,浸膏得率3 h比2 h显著提高(P<0.05);加醇量4.0倍与3.0倍相比较,浸膏得率显著降低(P<0.05),槲皮素含量相差不大.结论 在制备消渴降糖胶囊工艺中,应减少能源消耗,降低无效成分的提取率,减少浸膏量.在尽量减少杂质,保留有效成分,降低服用量的综合考虑下,采用4.0倍量乙醇进行醇沉有效成分损失少,浸膏得率低,符合工业化要求. 相似文献
56.
57.
目的:探讨口腔粘结技术对儿童下颌骨骨折的治疗效果。方法:对37例儿童下颌骨骨折应用复合树脂粘结固定夹板,其中 4例应用复合树脂直接固定;13例实施尼龙丝结扎-复合树脂固定夹板;12例实施贴钩-尼克丝-复合树脂固定;3例应用金属丝弓一复合树脂单颌固定;5例实施牙列贴钩 带钩丝弓-复合树脂颌间弹性牵引。结果:37例儿童下颌骨骨折中有35例咬合关系恢复正常,2例 有轻度错(牙合),经调(牙合)后咬合关系正常。结论:儿童混合牙列时期乳、恒牙交替及牙齿形态特殊,又儿童下颌骨中含有牙胚不易手术治疗,而常规牙弓夹板固定困难,因此,应用复合树脂粘结固定夹板治疗儿童下颌骨骨折是一项简易、高效的技术。 相似文献
58.
Following the discovery of X-rays in 1895 by Wilhelm Röntgen the value to the military surgeon of the new technique was soon realised. The localisation of retained bullets by radiography avoided inappropriate exploration of the wound. The X-rays were first used on casualties from the Abyssinian War of 1896 and the developing radiological technology was progressively applied to military surgery. In addition the needs of warfare stimulated the development of all aspects of radiology. 相似文献
59.
Steven J. Davidson MD MBA Frank L. Zwemer Jr. MD MBA Larry A. Nathanson MD Kenneth N. Sable MD Abu N.G.A. Khan MD MS 《Academic emergency medicine》2004,11(11):1127-1134
Physician-generated emergency department clinical documentation (information obtained from clinician observations and summarized decision processes inclusive of all manner of electronic systems capturing, storing, and presenting clinical documentation) serves four purposes: recording of medical care and communication among providers; payment for hospital and physician; legal defense from medical negligence allegations; and symptom/disease surveillance, public health, and research functions. In the consensus development process described by Handler, these objectives were balanced with the consideration of efficiency, often evaluated as physician time and clinical documentation system costs, in recording the information necessary for their accomplishment. The consensus panel session participants and authors recommend that 1) clinical documentation be electronically retrievable; 2) selection and implementation be evidence-based and grounded on valid metrics (research is needed to identify these metrics); 3) the user interface be crafted to promote clinical excellence through high-quality information collection and efficient charting techniques; 4) the priorities for integration of clinical information be standardized and implemented within enterprises and across health and information systems; 5) systems use accepted standards for bidirectional, real-time clinical data exchange, without limiting the location or number of simultaneous users; 6) systems fully utilize existing electronic sources of specific patient information and general medical knowledge; 7) systems automatically and reliably capture appropriate data that support electronic billing for emergency department services; and 8) systems promote bedside documentation and mobile access. 相似文献
60.
Neurosurgery has traditionally been at the forefront of advancing technologies, adapting new techniques and devices successfully
in an effort to increase the safety and efficacy of brain and spine surgery. Among these adaptations are surgical robotics.
This paper reviews some of the more promising systems in neurosurgical robotics, including brain and spine applications in
use and in development. The purpose of the discussion is twofold—to discuss the most promising models for neurosurgical applications,
and to discuss some of the pitfalls of robotic neurosurgery given the unique anatomy of the brain and spine. 相似文献