全文获取类型
收费全文 | 25339篇 |
免费 | 2260篇 |
国内免费 | 2168篇 |
专业分类
耳鼻咽喉 | 172篇 |
儿科学 | 288篇 |
妇产科学 | 232篇 |
基础医学 | 2970篇 |
口腔科学 | 413篇 |
临床医学 | 3401篇 |
内科学 | 3648篇 |
皮肤病学 | 166篇 |
神经病学 | 1278篇 |
特种医学 | 956篇 |
外国民族医学 | 18篇 |
外科学 | 2904篇 |
综合类 | 4343篇 |
现状与发展 | 4篇 |
一般理论 | 1篇 |
预防医学 | 1757篇 |
眼科学 | 658篇 |
药学 | 2760篇 |
24篇 | |
中国医学 | 1385篇 |
肿瘤学 | 2389篇 |
出版年
2024年 | 109篇 |
2023年 | 407篇 |
2022年 | 1040篇 |
2021年 | 1214篇 |
2020年 | 956篇 |
2019年 | 835篇 |
2018年 | 859篇 |
2017年 | 749篇 |
2016年 | 781篇 |
2015年 | 1133篇 |
2014年 | 1390篇 |
2013年 | 1218篇 |
2012年 | 1702篇 |
2011年 | 1951篇 |
2010年 | 1251篇 |
2009年 | 1000篇 |
2008年 | 1306篇 |
2007年 | 1391篇 |
2006年 | 1281篇 |
2005年 | 1316篇 |
2004年 | 813篇 |
2003年 | 919篇 |
2002年 | 701篇 |
2001年 | 588篇 |
2000年 | 647篇 |
1999年 | 751篇 |
1998年 | 486篇 |
1997年 | 487篇 |
1996年 | 348篇 |
1995年 | 320篇 |
1994年 | 324篇 |
1993年 | 179篇 |
1992年 | 215篇 |
1991年 | 182篇 |
1990年 | 161篇 |
1989年 | 165篇 |
1988年 | 142篇 |
1987年 | 115篇 |
1986年 | 86篇 |
1985年 | 98篇 |
1984年 | 32篇 |
1983年 | 24篇 |
1982年 | 21篇 |
1981年 | 19篇 |
1980年 | 11篇 |
1979年 | 19篇 |
1978年 | 7篇 |
1977年 | 4篇 |
1976年 | 5篇 |
1975年 | 7篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
11.
J F Cai 《中华整形烧伤外科杂志》1989,5(3):190-2, 238
Since 1985, on the basis of anatomic study of dorsal pedal artery, thumb and radial side of palm reconstruction have been successfully performed in one stage by using opposite composite dorsal pedal flap including the second toe, the second metatarsal and the first toe web. Because they were all distributed by dorsal pedal artery and great saphenous vein, dissecting these tissues was not difficult. Good function and cosmetic appearance were achieved following reconstruction. 相似文献
12.
目的评价美国强生VITROS250全自动干化学分析仪器。方法运用相关统计学方法对VITROS250全自动干化学分析仪的精密度、相关性、抗胆红素干扰方面进行分析。结果VITROS250全自动干化学分析仪精密度高,回收率高,相关性好,抗干扰能力强。结论VITROS250全自动干化学分析仪适用于临床实验诊断中心(检验科)急诊化验室生化项目的检测。 相似文献
13.
A Batak Indonesian from North Sumatra with hemoglobin (Hb) D Punjab (alpha 2 beta 2 121----Gln) and hemoglobin Constant Spring (Hb CoSp) is described. The 24-year-old man did not have clinical symptoms, and his hematological indices were normal. However, he had a persistent slight elevation of fetal hemoglobin level. His mother and his brother were heterozygous for Hb D Punjab; his father had Hb CoSp trait. A sister did not have any abnormal hemoglobin. To show the exact molecular defect leading to the synthesis of Hb CoSp in this family, genomic DNA from the father was analyzed by hybridization with synthetic oligonucleotides. Genomic DNA was digested with Sst I and Hind III producing a 1.05-kb fragment from the 3' end segment of the alpha 2-globin gene, including the termination codon. Two nonadecamers were synthesized to serve as probes: one, entirely homologous to the normal 3' end of alpha 2A-globin gene sequence, including the termination codon TAA, the other different from it by a replacement of the T in the termination codon TAA with C, changing it to CAA, the codon for the amino acid glutamine. DNA from normal controls gave a positive signal with the normal alpha 2TAA oligonucleotide probe but negative with the alpha 2 CAA probe. The father of propositus who had Hb CoSp trait gave a positive signal with the normal alpha 2TAA oligonucleotide probe as well as with the alpha 2CAA oligonucleotide probe, showing him to be heterozygous for the alpha 2CAA-globin gene. This result shows that the Hb CoSp in the Batak family is indeed due to a replacement of T by C in the TAA termination codon of the alpha 2-globin gene changing it to CAA the condon for glutamine. This explains the resulting readthrough of the untranslated sequence of the mRNA. 相似文献
14.
CAILU LIUSHUZHENG 《Biomedical and environmental sciences : BES》1992,5(1):46-52
Human lymphocytes pre-exposed to 10 mGy or 50mGy of X-rays become less sensitive to subsequent large dose irradiation,exhibited lower rate of chromosome aberration than expected.This adaptive response could be inhibited by cycloheximide,a protein synthesis inhibitor for successive 2h period ranging from 0.5h before to 4h after the low dose exposure,indicating that the adaptive response was directly related with the protein synthesis. 相似文献
15.
16.
17.
目的 探讨西藏地区农、牧民生活习俗与包囊虫病的关系。方法 自制问卷对 7个县 2 40个家庭 163 1名成员与包囊虫感染有关的生活习俗进行调查分析。结果 饭前便后洗手的人仅有 16 1%,餐具一般都用天然水洗 ,大部家庭用天然绵羊绒擦洗茶具。大多数人都喝过河溪水 ,池塘水 ,人人都吃半生不熟的肉 ,半数以上的吃生肉和生血肠 ,绝大多数人喝未经消毒的鲜牛、羊奶。 10 0 %家庭养狗 ,所有人员与狗、羊、牛、马接触密切。包囊虫病人占调查人数 0 43 %( 7/ 163 1) ,有典型症状者占 0 67%( 11/ 163 1)。结论 当地居民感染包囊虫与不良生活习俗有关 相似文献
18.
现将本院2006年1月-2006年12月54例经DSA全脑造影及栓塞术的麻醉处理总结如下。
1资料与方法
1.1一般资料
本组54例患者中,男29例,女25例,年龄11-70岁,ASAⅡ-Ⅲ级,急诊11例。术前昏迷5例,术中动脉瘤破裂2例。 相似文献
19.
The wheat--Thinopyrum amphiploid 'Agrotriticum # 3425' (AT 3425), which is highly resistant to Cephalosporium stripe, was identified to carry seven pairs of Thinopyrum chromosomes, three pairs of wheat--Thinopyrum translocated chromosomes and 18 pairs of wheat chromosomes. Fluorescence genomic in situ hybridization (FGISH), C-banding, sequential C-banding and FGISH, and denaturing polyacrylamide gel electrophoresis (SDS-PAGE) were used to characterize and identify the chromosomes. The Thinopyrum chromosomes in AT 3425 were designated as T1 through T7 based on their C-banding patterns. The FGISH and C-banding patterns of mitotic chromosomes in AT 3425 and meiotic chromosomes in the hybrid between AT 3425 and wheat cultivar 'Chinese Spring' (CS) revealed that wheat chromosomes 1D, 2B and 3D were involved in the three wheat-Thinopyrum chromosome translocations designated as (W-T)1, (W-T)2, and (W-T)3 respectively. The analysis of high-molecular-weight glutenin subunits in single seeds of AT 3425 confirmed the involvement of wheat chromosome 1D in the translocation (W-T)1. The designations 1DSuu.1DL-1TL, 2BSuu.2BL-2TL and 3DSuu.3DL-3TL were suggested for the wheat--Thinopyrum translocated chromosomes (W-T)1, (W-T)2 and (W-T)3 in AT 3425 respectively. 相似文献
20.
探讨人工心脏起搏器植换方式选择。方法:起搏器植换22例,其中,能源耗竭14例,感知和起搏功能障碍4例,囊袋感染破溃致PM外露4例。非感染者起搏阈值,〈2.5V,行原位植换:PT值〉3.0V或有感染者,更换全套起搏系统。结果:非感染的18例中,10例PT〈2.5V,实行原位植换;8例PT值〉3.0V和其余4例有感染者,植入新的起搏系统。 相似文献