全文获取类型
收费全文 | 62414篇 |
免费 | 6231篇 |
国内免费 | 4372篇 |
专业分类
耳鼻咽喉 | 549篇 |
儿科学 | 771篇 |
妇产科学 | 535篇 |
基础医学 | 6165篇 |
口腔科学 | 1110篇 |
临床医学 | 7243篇 |
内科学 | 8481篇 |
皮肤病学 | 664篇 |
神经病学 | 2965篇 |
特种医学 | 2415篇 |
外国民族医学 | 21篇 |
外科学 | 6689篇 |
综合类 | 12977篇 |
现状与发展 | 15篇 |
一般理论 | 1篇 |
预防医学 | 4976篇 |
眼科学 | 1396篇 |
药学 | 6702篇 |
65篇 | |
中国医学 | 4512篇 |
肿瘤学 | 4765篇 |
出版年
2024年 | 206篇 |
2023年 | 814篇 |
2022年 | 1852篇 |
2021年 | 2636篇 |
2020年 | 2173篇 |
2019年 | 1785篇 |
2018年 | 1858篇 |
2017年 | 1942篇 |
2016年 | 1775篇 |
2015年 | 2607篇 |
2014年 | 3260篇 |
2013年 | 3457篇 |
2012年 | 4935篇 |
2011年 | 5519篇 |
2010年 | 4254篇 |
2009年 | 3698篇 |
2008年 | 4037篇 |
2007年 | 3977篇 |
2006年 | 3698篇 |
2005年 | 3230篇 |
2004年 | 2655篇 |
2003年 | 2565篇 |
2002年 | 2291篇 |
2001年 | 1628篇 |
2000年 | 1288篇 |
1999年 | 955篇 |
1998年 | 660篇 |
1997年 | 581篇 |
1996年 | 446篇 |
1995年 | 383篇 |
1994年 | 335篇 |
1993年 | 210篇 |
1992年 | 195篇 |
1991年 | 200篇 |
1990年 | 150篇 |
1989年 | 125篇 |
1988年 | 104篇 |
1987年 | 93篇 |
1986年 | 80篇 |
1985年 | 61篇 |
1984年 | 40篇 |
1983年 | 20篇 |
1982年 | 17篇 |
1981年 | 14篇 |
1980年 | 13篇 |
1976年 | 15篇 |
1974年 | 13篇 |
1969年 | 11篇 |
1968年 | 11篇 |
1930年 | 11篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
Sophocarpine attenuates toll‐like receptor 4 in steatotic hepatocytes to suppress pro‐inflammatory cytokines synthesis 下载免费PDF全文
2.
3.
4.
The ban of lead in many electronic products and the expectation that, sooner or later, this ban will include the currently exempt piezoelectric ceramics based on Lead-Zirconate-Titanate has motivated many research groups to look for lead-free substitutes. After a short overview on different classes of lead-free piezoelectric ceramics with large strain, this review will focus on Bismuth-Sodium-Titanate and its solid solutions. These compounds exhibit extraordinarily high strain, due to a field induced phase transition, which makes them attractive for actuator applications. The structural features of these materials and the origin of the field-induced strain will be revised. Technologies for texturing, which increases the useable strain, will be introduced. Finally, the features that are relevant for the application of these materials in a multilayer design will be summarized. 相似文献
5.
We report clinical, neuroradiologic features, and neuropathologic findings of a 76‐year‐old man with coexistent Pick’s disease and progressive supranuclear palsy. The patient presented with loss of recent memory, abnormal behavior and change in personality at the age of 60. The symptoms were progressive. Three years later, repetitive or compulsive behavior became prominent. About 9 years after onset, he had difficulty moving and became bed‐ridden because of a fracture of his left leg. His condition gradually deteriorated and he developed mutism and became vegetative. The patient died from pneumonia 16 years after the onset of symptoms. Serial MRI scans showed progressive cortex atrophy, especially in the bilateral frontal and temporal lobes. Macroscopic inspection showed severe atrophy of the whole brain, including cerebrum, brainstem and cerebellum. Microscopic observations showed extensive superficial spongiosis and severe neuronal loss with gliosis in the second and third cortical layers in the frontal, temporal and parietal cortex. There were Pick cells and argyrophilic Pick bodies, which were tau‐ and ubiquitin‐positive in neurons of layers II–III of the above‐mentioned cortex. Numerous argyrophilic Pick bodies were observed in the hippocampus, especially in the dentate fascia. In addition, moderate to severe loss of neurons was found with gliosis and a lot of Gallyas/tau‐positive globus neurofibrillary tangles in the caudate nucleus, globus pallidus, thalamus, substantia nigra, locus coeruleus and dentate nucleus. Numerous thorned‐astrocytes and coiled bodies but no‐tuft shaped astrocytes were noted in the basal ganglion, brainstem and cerebellar white matter. In conclusion, these histopathological features were compatible with classical Pick’s disease and coexistence with progressive supranuclear palsy without tuft‐shaped astrocytes. 相似文献
6.
颅内肿瘤切除术后颅内感染危险因素分析 总被引:1,自引:0,他引:1
目的 探讨颅内肿瘤切除术后颅内感染的危险因素和预防措施。方法 回顾性分析442例颅内肿瘤切除术患者的临床资料。结果 442例颅内肿瘤切除术患者发生颅内感染33例,感染率为7.47%。非脑膜瘤手术颅内感染率为10.04%,高于脑膜瘤术后颅内感染率3.83%(P〈0.05);手术时间≥4h者颅内感染率为9.87%,高于手术时间〈4h者颅内感染率4.78%(P〈0.05);有脑脊液漏者颅内感染率为15.00%,高于无脑脊液漏者颅内感染率6.28%(P〈0.05);引流管留置≥24h者颅内感染率为11.58%,高于未留置或留置〈24h者颅内感染率5.03%(P〈0.05)。结论 手术时间≥4h、引流管留置时间≥24h、存在脑脊液漏是颅内肿瘤切除术后发生颅内感染的危险因素。 相似文献
7.
用放射配体结合分析法分别测定了正常组、特布他林组、特布他林十曲尼司特组豚鼠的肺组织β受体最大结合力和解离常数,结果显示:给特布他林后豚鼠肺组织β受体发生明显的向下调节.曲尼司特可预防此向下调节的发生. 相似文献
8.
棕榈油对成人血脂和血小板功能的影响 总被引:3,自引:0,他引:3
报道了棕榈油(PA),花生油(PE)对血清总胆固醇水平(TC)在5.5~7.0mmol/L的受试者血脂和血小板功能的影响。51名受试者(男31人,女20人,年龄30~66岁之间)分为两组,一组男15人,女11人,称PE组;另一组男16人女9人,称PA组,预备期3周,膳食以当地日常食用的花生油烹调,实验期6周。PA组受试者食用以棕榈油烹调的实验膳;PE组受试者仍食花生油烹调的膳食。脂肪约占膳食能量的30%,其中60%~65%来自实验油。实验结果表明:与起始值相比,6周末PA组受试者血清TC,低密度脂蛋白胆固醇(LDL-C)和总胆固醇与高密度脂蛋白胆固醇比值(TC/HDL-C)显著下降,血浆血栓素B2(TXB2)/6-酮前列环素F1α、(6-keto-PGF1α)比值显著下降,全血血小板聚集率未见显著变化。PE组受试者的血脂、血浆TXB2、6-keto-PGF1α及全血血小板聚集率等指标均未出现显著变化。提示,棕榈油作为我国居民家庭烹调用油并不会增加发生心血管疾病的危险。 相似文献
9.
10.