全文获取类型
收费全文 | 15226篇 |
免费 | 1095篇 |
国内免费 | 366篇 |
专业分类
耳鼻咽喉 | 52篇 |
儿科学 | 207篇 |
妇产科学 | 165篇 |
基础医学 | 1696篇 |
口腔科学 | 139篇 |
临床医学 | 623篇 |
内科学 | 2249篇 |
皮肤病学 | 244篇 |
神经病学 | 860篇 |
特种医学 | 310篇 |
外国民族医学 | 1篇 |
外科学 | 1024篇 |
综合类 | 2057篇 |
预防医学 | 713篇 |
眼科学 | 160篇 |
药学 | 2347篇 |
中国医学 | 3019篇 |
肿瘤学 | 821篇 |
出版年
2024年 | 53篇 |
2023年 | 177篇 |
2022年 | 364篇 |
2021年 | 412篇 |
2020年 | 336篇 |
2019年 | 683篇 |
2018年 | 674篇 |
2017年 | 487篇 |
2016年 | 350篇 |
2015年 | 394篇 |
2014年 | 630篇 |
2013年 | 792篇 |
2012年 | 764篇 |
2011年 | 863篇 |
2010年 | 661篇 |
2009年 | 644篇 |
2008年 | 646篇 |
2007年 | 720篇 |
2006年 | 622篇 |
2005年 | 468篇 |
2004年 | 440篇 |
2003年 | 462篇 |
2002年 | 403篇 |
2001年 | 430篇 |
2000年 | 287篇 |
1999年 | 245篇 |
1998年 | 168篇 |
1997年 | 174篇 |
1996年 | 102篇 |
1995年 | 100篇 |
1994年 | 84篇 |
1993年 | 74篇 |
1992年 | 63篇 |
1991年 | 63篇 |
1990年 | 60篇 |
1989年 | 53篇 |
1987年 | 50篇 |
1985年 | 271篇 |
1984年 | 389篇 |
1983年 | 265篇 |
1982年 | 268篇 |
1981年 | 244篇 |
1980年 | 204篇 |
1979年 | 219篇 |
1978年 | 171篇 |
1977年 | 97篇 |
1976年 | 165篇 |
1975年 | 135篇 |
1974年 | 90篇 |
1973年 | 82篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
TSG-6基因在3T3-L1脂肪细胞诱导分化中表达水平的变化 总被引:2,自引:0,他引:2
[目的] 探讨TSG-6基因在3T3-L1脂肪细胞诱导分化中表达水平的变化。[方法] 采用细胞培养和RT-PCR技术,检测细胞诱导分化不同时段脂肪细胞中TSG-6基因的表达水平。[结果] ①随着脂肪细胞逐渐分化成熟,TSG-6基因mRNA表达水平逐渐升高;②TSG-6基因表达水平除在细胞分化第0-2d、第3-5d和第7-10d各时段内差异无显著性(P>0.05)外,其余各时段之间表达水平差异均有显著性(P<0.05)。[结论] TSG-6基因与细胞分化以及脂原形成可能相关。 相似文献
32.
Raj P. Kapur Ian Neilson Robert M.W. Hofstra Lynda W. Holloway Ron C. Michaelis Kathleen A. Leppig 《American journal of medical genetics. Part A》2002,108(1):51-56
Congenital hydrocephalus associated with aqueductal stenosis and/or agenesis of the corpus callosum has been described in newborn males with mutations in L1CAM, a gene that encodes a neural cell adhesion molecule. These males usually have severe mental retardation and may have spastic paraplegia and adducted thumbs. In contrast, Hirschsprung disease, or absence of ganglion cells in the distal gut, has rarely been described in such individuals. We report a male infant who had severe hydrocephalus identified in the prenatal period with evidence of aqueductal stenosis and adducted thumbs at birth. He developed chronic constipation, and rectal biopsy confirmed the diagnosis of Hirschsprung disease. Molecular testing of the L1CAM gene revealed a G2254A mutation, resulting in a V752M amino acid substitution. A common polymorphism in RET, but no mutation, was identified. Our patient represents the third example of coincident hydrocephalus and Hirschsprung disease in an individual with an identified L1CAM mutation. We hypothesize that L1CAM‐mediated cell adhesion may be important for the ability of ganglion cell precursors to populate the gut, and that L1CAM may modify the effects of a Hirschsprung disease–associated gene to cause intestinal aganglionosis. © 2002 Wiley‐Liss, Inc. 相似文献
33.
Michael P Hill Erwan Bezard Steven G McGuire Alan R Crossman Jonathan M Brotchie Ann Michel Renee Grimée Henrik Klitgaard 《Movement disorders》2003,18(11):1301-1305
Long-term dopamine replacement therapy of Parkinson's disease leads to the occurrence of dyskinesias. Altered firing patterns of neurons of the internal globus pallidus, involving a pathological synchronization/desynchronization process, may contribute significantly to the genesis of dyskinesia. Levetiracetam, an antiepileptic drug that counteracts neuronal (hyper)synchronization in animal models of epilepsy, was assessed in the MPTP-lesioned marmoset model of Parkinson's disease, after coadministration with (1) levodopa (L-dopa) or (2) ropinirole/L-dopa combination. Oral administration of levetiracetam (13-60 mg/kg) in combination with either L-dopa (12 mg/kg) alone or L-dopa (8 mg/kg)/ropinirole (1.25 mg/kg) treatments was associated with significantly less dyskinesia, in comparison to L-dopa monotherapy during the first hour after administration. Thus, new nondopaminergic treatment strategies targeting normalization of abnormal firing patterns in basal ganglia structures may prove useful as an adjunct to reduce dyskinesia induced by dopamine replacement therapy without affecting its antiparkinsonian action. 相似文献
34.
L. Paczek J. Pazik M. Teschner R. M. Schaefer W. Rowinski J. Szmidt K. Abgarowicz L. Gradowska M. Morzycka-Michalik A. Heidland 《Transplant international》1994,7(S1):311-313
Abstract The major reason for late graft losses is chronic rejection. Recently, a large number of studies have indicated that proteolytic enzymes play an important role as mediators of glomerular injury. The cysteine proteinases cathepsins B and L degrade structural matrix proteins such as type I collagen and laminin. We investigated intraglomerular protease activities in 12 patients after kidney graftectomy because of end-tage renal disease following chronic rejection. A group of 12 patients undergoing nephrectomy because of cancer served as controls using only non-involved parts of the kidney. The activities of cathepsins B and L in homogenates of isolated glomeruli were measured fluorometrically methylcoumarylamidc substrates and related to DNA content. In rejected kidney allografts we observed significantly enhanced intraglomerular cathepsin B activity and cathepsin B + L activity. 相似文献
35.
左旋硝基精氨酸诱导高血压大鼠心肌肥大 总被引:4,自引:3,他引:1
一氧化氮合酶(NOS)抑制剂N-左旋硝基精氨酸(N-LNA)诱导持续性高血压大鼠12只,随机分成2组测右颈动脉压,NO代谢物亚硝酸盐(NO2)浓度,心肌组织胶原蛋白含量及丝裂活化蛋白激酶(MAPK)活性,观察左心室心肌病理变化,发现与高血压比较,自然归组大鼠动脉血完全逆转(P〈0.01);NO2水平及MAPK活性轻度逆转,但均未达到正常对照组水平(P〈0.01),胶原蛋白含量,心脏及左心室相对重量 相似文献
36.
目的 :通过采用体细胞融合技术将西洋参基因转入胡萝卜中 ,为贵重中药、生长受地理环境等限制的中药扩大药源 ,利用杂种优势为培养适于大面积栽培且有效成分人参皂苷含量较高的优良杂交品种提供理论与实验依据。方法 :用PEG法对五加科植物西洋参与伞形科植物胡萝卜进行体细胞融合 ,通过同工酶进行初步杂种鉴定并用HPLC法测定西洋参和胡萝卜体细胞融合培养愈伤组织中人参皂苷Rb1含量。结果 :体细胞融合技术成功地获得了西洋参和胡萝卜体细胞杂交愈伤组织 ;同工酶分析是鉴定杂种的有效手段之一 ;在 10个杂交体愈伤组织中有 6个杂交体愈伤组织人参皂苷Rb1含量比未融合前西洋参愈伤组织中的含量高。 相似文献
37.
目的观察由黄芪、白术、淫羊藿组成的复方制剂(壮骨肾宝)对实验性小鼠高脂血症的影响。方法用蛋黄乳液快速致小鼠单纯性高胆固醇血症和喂养高脂饲料致高脂血症模型 ,观察预防性给予不同剂量的壮骨肾宝后对血清总胆固醇(TC)、甘油三酯(TG)和高密度脂蛋白胆固醇(HDL -ch)的影响。结果壮骨肾宝中、高剂量能使血清TC降低(P<0.05),HDL -ch升高(P<0.01) ,但对TG的影响不大。结论壮骨肾宝有一定降血脂作用 ,并与剂量有关 相似文献
38.
Some biochemical and enzymatic constituents were determined in the small intestinal tract tissues of normal and sodium glycollate treated adult male rats. Alterations were observed with respect to certain lipids and carbohydrate fractions in the glycollate fed rats. DNA content was also elevated in this group. The functions of the cell membrane is likely to be affected as reflected in the levels of transport ATPases and orthophospho-hydrolases. The activities of the two marker enzymes in the intestinal brush border, namely alkaline phosphatase and leucylnaphthylamidase were reduced in the glycollate administered group. Administration of L(+)-tartrate, which is a mild laxative and has a regulatory influence on oxalate metabolism, lowered the activities of Na+, K(+)- and Ca(2+)-ATPases. There was a distinct lowering in the level of acid phosphatase in the tartrate treated rats. 相似文献
39.
The MASA syndrome is an X-linked disorder with mental retardation, spastic paraparesis, and adducted thumbs as the most characteristic features. We performed linkage analysis, using Xq28 markers, on a large MASA syndrome family. The maximum lodscore was 6.37 at 0 recombination for DXS52 and 5.99 at 0 recombination for DXS305. Crossovers were demonstrated between the disorder and DXS455. Clinical and linkage data from this family further support the hypothesis that the MASA syndrome and X-linked hydrocephalus are allelic disorders. 相似文献
40.
对生长在合作地区的955名藏、汉族学生进行了个性特征及其影响因素的调查探讨。结果表明:本民族间男、女生E分比较,男生低于女生,显示女生性格较男生性格外向倾向性大。稳定性方面女生N分高于男生,即女生情绪一般不及男生稳定。此外与该地区藏汉族学生个性特征关系较为密切的因素是:兄弟姐妹数、父母亲文化程度、职业以及学前教育和智商。 相似文献