全文获取类型
收费全文 | 6823篇 |
免费 | 394篇 |
国内免费 | 36篇 |
专业分类
耳鼻咽喉 | 94篇 |
儿科学 | 126篇 |
妇产科学 | 88篇 |
基础医学 | 826篇 |
口腔科学 | 348篇 |
临床医学 | 522篇 |
内科学 | 1756篇 |
皮肤病学 | 150篇 |
神经病学 | 418篇 |
特种医学 | 323篇 |
外国民族医学 | 1篇 |
外科学 | 924篇 |
综合类 | 28篇 |
预防医学 | 302篇 |
眼科学 | 135篇 |
药学 | 571篇 |
中国医学 | 45篇 |
肿瘤学 | 596篇 |
出版年
2023年 | 47篇 |
2022年 | 95篇 |
2021年 | 191篇 |
2020年 | 97篇 |
2019年 | 154篇 |
2018年 | 180篇 |
2017年 | 146篇 |
2016年 | 139篇 |
2015年 | 128篇 |
2014年 | 168篇 |
2013年 | 216篇 |
2012年 | 334篇 |
2011年 | 399篇 |
2010年 | 203篇 |
2009年 | 166篇 |
2008年 | 316篇 |
2007年 | 277篇 |
2006年 | 305篇 |
2005年 | 306篇 |
2004年 | 272篇 |
2003年 | 269篇 |
2002年 | 274篇 |
2001年 | 182篇 |
2000年 | 180篇 |
1999年 | 183篇 |
1998年 | 69篇 |
1997年 | 65篇 |
1995年 | 41篇 |
1994年 | 44篇 |
1993年 | 37篇 |
1992年 | 123篇 |
1991年 | 116篇 |
1990年 | 111篇 |
1989年 | 119篇 |
1988年 | 131篇 |
1987年 | 146篇 |
1986年 | 133篇 |
1985年 | 121篇 |
1984年 | 87篇 |
1983年 | 55篇 |
1981年 | 32篇 |
1979年 | 50篇 |
1977年 | 41篇 |
1975年 | 36篇 |
1973年 | 30篇 |
1971年 | 48篇 |
1970年 | 42篇 |
1969年 | 44篇 |
1967年 | 32篇 |
1966年 | 35篇 |
排序方式: 共有7253条查询结果,搜索用时 625 毫秒
1.
2.
3.
Dermoscopic features of hidroacanthoma simplex: Usefulness in distinguishing it from Bowen's disease and seborrheic keratosis
下载免费PDF全文
![点击此处可从《The Journal of dermatology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Chihiro Shiiya Hiroo Hata Yuka Inamura Keisuke Imafuku Shinya Kitamura Hiromi Fujita Hiroshi Shimizu 《The Journal of dermatology》2015,42(10):1002-1005
Hidroacanthoma simplex (HAS) is a rare benign eccrine adnexal tumor. HAS is sometimes clinically or pathologically misdiagnosed as squamous cell carcinoma in situ (Bowen's disease; BD), seborrheic keratosis (SK) or other adnexal tumor. To date, there has never been a report focusing on dermoscopic features to distinguish HAS from BD and SK. We found the following dermoscopic findings to be characteristic of HAS: fine black dots/globules (75% of cases) and fine scales arranged annularly (100% of cases). In contrast, glomerular vessels, which are typically observed in BD, were not seen in any of the four cases. Cerebriform appearance and milia‐like cysts, which are typically observed in SK, were also not seen in any of the four cases. The existence of “scattered fine black dots/globules” and “fine scales arranged annularly”, and the absence of the glomerular vessels, may contribute to precise diagnosis of HAS. Even though HAS resembles BD or SK clinically, it can be distinguished from these by the characteristic dermoscopic features. 相似文献
4.
5.
6.
Shinsuke Hamaguchi Yasuhisa Okuda Toshimitsu Kitajima Nobuhide Masawa 《Journal canadien d'anesthésie》2002,49(7):745-748
PURPOSE: To clarify the appropriate concentration and dose of hypertonic saline solution (HSS) for preventing delayed neuronal death in the hippocampal CA1 subfield after transient forebrain ischemia in gerbils. METHODS: Thirty gerbils were randomly assigned to five groups: physiological saline solution (PSS) group, ischemia/reperfusion treated with PSS 2 mL x kg(-1); 5% HSS group, treated with 5% HSS 2 mL x kg(-1); 7.5% HSS group, treated with 7.5% HSS 2 mL x kg(-1); 10% HSS group, treated with 10% HSS 2 mL x kg(-1); 20% HSS group, treated with 20% HSS 2 mL x kg(-1). Transient forebrain ischemia was induced by occluding the bilateral common carotid arteries for four minutes. Five days later, histopathological changes in the hippocampal area were examined, and the degenerative ratio of the pyramidal cells were measured according to the following formula: (number of degenerative pyramidal cells/total number of pyramidal cells per 1 mm of hippocampal CA1 subfield) x 100. RESULTS: In PSS and 20% groups, neuronal cell damage was observed five days after ischemia. In the other three groups, these changes were not observed. The degenerative ratios of pyramidal cells were as follows; PSS group: 91.6 +/- 5.6%, 5% HSS group: 7.2 +/- 1.6%, 7.5% group: 8.3 +/- 1.4%, 10% HSS group: 6.2 +/- 1.1%, 20% HSS group: 85.8 +/- 8.7% (P < 0.05; PSS and 20% HSS vs three other groups). CONCLUSION: This study demonstrates that 5, 7.5 or 10% HSS 2 mL x kg(-1) may prevent delayed neuronal death in the hippocampal CA1 subfield after cerebral ischemia/reperfusion in gerbils. 相似文献
7.
8.
Y Wada H Hasegawa H Okuda K Yoshida N Yamaguchi 《The Japanese journal of psychiatry and neurology》1989,43(2):245-253
Kindling of the primary visual cortex (VC) was compared with that of the amygdala in cats. VC kindling was basically similar to kindling of the amygdala in that daily electrical stimulation can lead to the development of a generalized convulsion in most subjects, a growth of afterdischarges in their configuration and duration, and a reduction of the afterdischarge threshold. The kindling response of the VC differed from that of the amygdala in a number of respects, i.e., a high afterdischarge threshold, a different pattern of behavioral seizure development, an abrupt growth of electroclinical seizures coincident with the onset of a generalized convulsion, an intersubject variability in seizure susceptibility, and a marked seizure instability. In VC kindling the afterdischarge propagation into the amygdala was not observed until the generalized convulsion developed, and the early involvement of afterdischarge was seen in the pulvinar, lateral geniculate body, and superior colliculus. These data suggest that a neural mechanism different from amygdaloid kindling may participate in VC kindling, and that the subcortical structures of the visual system are involved in the preferential pathway for a seizure generalization from the VC. 相似文献
9.
Ryo Wakita Yuka Ohno Saori Yamazaki Hikaru Kohase Masahiro Umino 《Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics》2006,102(6):e28-e32
Two cases of vasovagal syncope (VVS) during venous access are reported. Both patients had a history of fainting episodes and experienced bradycardia with asystole, hypotension, and fainting. Pain and phobic stress during venous access triggered an increase in parasympathetic tone, resulting in bradycardia with asystole and hypotension in both cases. Hypotension and bradycardia likely caused cerebral hypoperfusion, leading to fainting. The intense parasympathetic tone triggered by somatic or emotional stress was likely responsible for directly depressing the sinus node, leading to asystole and bradycardia. Bradycardia with asystole progressing to syncope is a potentially fatal dysrhythmia in patients with cardiovascular disease or older patients with decreased cardiac function. Appropriate treatment for VVS includes the administration of intravenous fluids, vagolytics, ephedrine, and the rapid use of the Trendelenburg position. Intravenous fluids and atropine were used to treat the present patients. 相似文献
10.