全文获取类型
收费全文 | 342223篇 |
免费 | 15888篇 |
国内免费 | 5926篇 |
专业分类
耳鼻咽喉 | 3033篇 |
儿科学 | 8578篇 |
妇产科学 | 5687篇 |
基础医学 | 43116篇 |
口腔科学 | 8003篇 |
临床医学 | 23416篇 |
内科学 | 54224篇 |
皮肤病学 | 5023篇 |
神经病学 | 21631篇 |
特种医学 | 9849篇 |
外国民族医学 | 2篇 |
外科学 | 40937篇 |
综合类 | 33579篇 |
现状与发展 | 21篇 |
一般理论 | 13篇 |
预防医学 | 24834篇 |
眼科学 | 5502篇 |
药学 | 41195篇 |
63篇 | |
中国医学 | 17648篇 |
肿瘤学 | 17683篇 |
出版年
2023年 | 3044篇 |
2022年 | 6825篇 |
2021年 | 9861篇 |
2020年 | 7390篇 |
2019年 | 17835篇 |
2018年 | 17587篇 |
2017年 | 11801篇 |
2016年 | 7922篇 |
2015年 | 7453篇 |
2014年 | 9870篇 |
2013年 | 15497篇 |
2012年 | 11586篇 |
2011年 | 13644篇 |
2010年 | 9156篇 |
2009年 | 9305篇 |
2008年 | 11247篇 |
2007年 | 13251篇 |
2006年 | 12958篇 |
2005年 | 12136篇 |
2004年 | 10078篇 |
2003年 | 9336篇 |
2002年 | 7912篇 |
2001年 | 7444篇 |
2000年 | 6907篇 |
1999年 | 6003篇 |
1998年 | 5507篇 |
1997年 | 4938篇 |
1996年 | 4538篇 |
1995年 | 4576篇 |
1994年 | 4309篇 |
1993年 | 3514篇 |
1992年 | 2972篇 |
1991年 | 2878篇 |
1990年 | 2440篇 |
1989年 | 1957篇 |
1988年 | 1977篇 |
1987年 | 1839篇 |
1985年 | 6418篇 |
1984年 | 8007篇 |
1983年 | 6356篇 |
1982年 | 6820篇 |
1981年 | 6166篇 |
1980年 | 5358篇 |
1979年 | 5331篇 |
1978年 | 4275篇 |
1977年 | 3258篇 |
1976年 | 3684篇 |
1975年 | 2865篇 |
1974年 | 2614篇 |
1973年 | 2314篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
161.
依据乡村医生人力结构现状调查结果,就现阶段县级卫校在初级卫生保健中的作用及今后面向乡村医生办学的可行性作了具体的分析和探讨。结论是:提高质量,加强对在岗乡医进行系统化正规中专层次的职后复训,应是县级卫校今后1O年的最主要的任务。 相似文献
162.
Y. Kajiya M. Nakajo N. Ichinari Y. Kajiya K. Yamazumi T. Otuji T. Tanaka 《Abdominal imaging》1997,22(1):111-113
A foregut cyst is formed as a result of abnormal budding and pinching of the tracheobronchial tree when bronchial buds develop
to form the primitive respiratory tree. Foregut cysts are clinically classified as bronchogenic, esophageal, enterogastric,
or ciliated hepatic. We present a foregut cyst that occurred in the retroperitoneum and was difficult to distinguish from
other retroperitoneal cystic mass lesions. Magnetic resonance imaging was useful in revealing the cyst's continuity to adjacent
organs.
Received: 19 June 1995/Accepted: 23 July 1995 相似文献
163.
原发性胸腰椎管内肿瘤延误诊治原因探讨(附44例报告) 总被引:2,自引:0,他引:2
本文报告一组44例原发性椎管内肿瘤初期延误诊治,其中10例为腰椎间盘突出而手术,2例为腰椎管狭窄症手术治疗。原发性椎管内肿瘤与脊柱退变性疾病分属两种不同的疾病范畴。为提高诊断和治疗效果,本文就误诊原因作以下讨论。 相似文献
164.
The electrodeposition of Ag on Pt(100)-(1 × 1) in perchlorate electrolyte was studied by means of time-resolved in situ scanning tunnelling microscopy (STM) and cyclic voltammetry. One monolayer of Ag is deposited underpotentially (upd) ca. 500 mV positive of the Ag+/Ag equilibrium potential. Several millivolts positive of the equilibrium potential, a second well defined upd layer forms. Its growth was observed to proceed via island formation and coalescence. This process occurs in two separate stages that manifest themselves in voltammetric peaks as well as in the STM images. 相似文献
165.
Ex vivo neutrophil function in response to three different doses of glycosylated rHuG-CSF (Lenograstim) 总被引:4,自引:0,他引:4
J. Turzanski S. P. M. Crouch J. Fletcher & A. Hunter 《British journal of haematology》1997,96(1):46-54
Granulocyte colony-stimulating factor (G-CSF) is being considered as adjuvant treatment for infections in non-neutropenic patients. Normal healthy donors were given rHuG-CSF (Lenograstim) at 2.5, 5.0 and 7.5 μg/kg subcutaneously daily for 5 d. Polymorphonuclear leucocyte (PMN) function tests were carried out on peripheral blood PMN before the first injection and at 24 h and 96 h. Circulating PMN levels were also measured at these time intervals and found to be significantly increased with all doses by 24 and 96 h. Investigation of cell surface antigen expression revealed no changes in β2 integrin (CD11b/CD18) expression. L-selectin (CD62L) expression was reduced with all doses by 96 h, this being significant with the 7.5 μg/kg dose. FcγRI (CD64) levels were significantly up-regulated with the 7.5 μg/kg dose by 96 h whereas FcγRIII (CD16) expression was found to be reduced during G-CSF treatment. Superoxide anion production was significantly increased in response to N -formylmethionylleucylphenylalanine (FMLP) and opsonized Staphylococcus epidermidis stimulation at 24 h and 96 h with the 5.0 and 7.5 μg/kg doses. The initial rate of phagocytosis (0–2 min) appeared to have increased with the 7.5 and 5.0 μg/kg doses at 96 and 24 h compared with PMN responses pretreatment, although these increases were not statistically significant. These results show that G-CSF enhances the functional responses of PMN stimulated by physiological agonists and may help in the treatment of infections. 相似文献
166.
KOHICHI ASAMI HIDENOBU ASHIKAWA TOMOKO TERAI NAOKO ISHIHARA HIROKO NAWATA KENZO HIRAO NOBUYUKI MIYASAKA TOKUHIRO KAWARA KAZUMASA HIEJIMA TOMOO HARADA FUMIO SUZUKI 《Pacing and clinical electrophysiology : PACE》1998,21(2):352-366
The typical fourth criterion for transient entrainment is defined when both a sudden shortening in conduction interval to and a distinct change in electrogram morphology at a bipolar recording site are demonstrated while performing overdrive pacing of a reentrant tachycardia from a single pacing site at two different constant rates. The purpose of this article was to test the hypothesis that if an intracardiac recording site showing both orthodromic and antidromic capture with entrainment pacing is located suitably distant from the circuit, sudden shortening in conduction interval to that site may occur without any significant change in the bipolar electrogram morphology (i.e., atypical form of the fourth criterion). Atrial overdrive pacing of orthodromic tachycardia was performed in 20 patients with either left anterior (12 patients) or left posterior (8 patients) accessory pathways. We investigated the effects of overdrive pacing from the proximal or distal coronary sinus, specifically effects on the electrogram interval and the electrogram morphology at the right atrial appendage. Overdrive pacing of orthodromic tachycardia from the proximal coronary sinus was performed in 10 of the 12 patients with left anterior accessory pathways; those 10 patients demonstrated the first entrainment criterion at the right atrial appendage site. Overdrive pacing of orthodromic tachycardia at still shorter cycle lengths demonstrated a sudden shortening in conduction interval to the right atrial appendage site. Despite shortening in conduction interval the morphology of the right atrial appendage electrogram was completely or almost identical to that during orthodromic tachycardia, indicating an atypical form of the fourth criterion. This criterion was not demonstrated in patients with left posterior accessory pathways. Thus, atypical fourth entrainment criterion was demonstrated during overdrive pacing of orthodromic tachycardia from the proximal coronary sinus only in patients with left anterior accessory path ways. Demonstration of atypical fourth criterion seems largely dependent on the location of the accessory pathway, the pacing, and the recording sites. 相似文献
167.
本组12例骨肉瘤均采用动脉区域灌注灭活再植及术后化疗方法,术后2年存活率平均为75%,1例因经验不足致局部复发,仅占8.3%,表明在化疗保障下,采用此种方法即能保肢,又能获得与截肢治疗相同的手术效果,优于单纯行灭活再植术后中方法。 相似文献
168.
G. I. C. Ingram M.D 《Haemophilia》1995,1(4):277-282
169.
熵代表无序的水平,作者使用通气的熵变(ECV)指示肺通气的不均匀性,ECV定义为当前泡潮气量趋近于零时每摩尔被吸入气体从不均匀通气到均匀通气的熵变的极限。本文从熵的基本公式民地出ECV的计算方程。用几个数学模型肺将ECV同其他7个洗出指标进行了比较。8个指标中,只有ECV仅取决于通气分布,其他7个指标不仅取决于通气分布,还同潮气量和死腔的大小有关。这影响了它们评价肺通气不均匀性的效果,ECV的另一 相似文献
170.