全文获取类型
收费全文 | 2679篇 |
免费 | 141篇 |
国内免费 | 5篇 |
专业分类
耳鼻咽喉 | 29篇 |
儿科学 | 77篇 |
妇产科学 | 17篇 |
基础医学 | 384篇 |
口腔科学 | 57篇 |
临床医学 | 142篇 |
内科学 | 529篇 |
皮肤病学 | 118篇 |
神经病学 | 343篇 |
特种医学 | 61篇 |
外科学 | 417篇 |
综合类 | 15篇 |
预防医学 | 65篇 |
眼科学 | 172篇 |
药学 | 184篇 |
中国医学 | 7篇 |
肿瘤学 | 208篇 |
出版年
2022年 | 19篇 |
2021年 | 30篇 |
2020年 | 15篇 |
2019年 | 22篇 |
2018年 | 58篇 |
2017年 | 27篇 |
2016年 | 28篇 |
2015年 | 39篇 |
2014年 | 43篇 |
2013年 | 65篇 |
2012年 | 108篇 |
2011年 | 104篇 |
2010年 | 69篇 |
2009年 | 51篇 |
2008年 | 108篇 |
2007年 | 94篇 |
2006年 | 100篇 |
2005年 | 83篇 |
2004年 | 105篇 |
2003年 | 97篇 |
2002年 | 90篇 |
2001年 | 126篇 |
2000年 | 114篇 |
1999年 | 108篇 |
1998年 | 27篇 |
1997年 | 24篇 |
1996年 | 20篇 |
1995年 | 28篇 |
1994年 | 29篇 |
1993年 | 21篇 |
1992年 | 99篇 |
1991年 | 82篇 |
1990年 | 87篇 |
1989年 | 75篇 |
1988年 | 54篇 |
1987年 | 74篇 |
1986年 | 75篇 |
1985年 | 58篇 |
1984年 | 44篇 |
1983年 | 32篇 |
1982年 | 26篇 |
1979年 | 26篇 |
1977年 | 13篇 |
1975年 | 19篇 |
1974年 | 14篇 |
1973年 | 14篇 |
1972年 | 20篇 |
1971年 | 14篇 |
1969年 | 16篇 |
1967年 | 19篇 |
排序方式: 共有2825条查询结果,搜索用时 15 毫秒
1.
Marie Ohata Susumu Fujiwara Ai Yoshioka Hiroshi Nagai Shintaro Sugita Nozomi Yamano Yusuke Inoue Chikako Nishigori 《Pediatric dermatology》2019,36(6):997-998
Fibroblastic connective tissue nevus (FCTN) is a benign cutaneous mesenchymal lesion characterized by proliferation of CD34‐positive fibroblastic/myofibroblastic spindle‐shaped cells. We report a case of agminated FCTN on the right lower abdomen of a 1‐year‐old boy. 相似文献
2.
Takamasa Kaneko Koichi Makimura Takashi Sugita Hideyo Yamaguchi 《Medical mycology》2006,44(3):227-231
We developed a simple identification kit for nine species of Malassezia (M. furfur, M. slooffiae, M. sympodialis, M. restricta, M. obtusa, M. globosa, M. pachydermatis, M. dermatis, and M. japonica) based on their biological features. This method utilizes Tween 40-based precipitate production on modified chromogenic agar (CHROMagar) Malassezia medium, growth on specific agars (Sabouraud's dextrose agar, Cremophor EL agar, Tween 60-esculin agar), and catalase reactions. This identification kit was verified with 11 type and reference strains of nine Malassezia species. An additional 26 clinical isolates were also successfully identified using the kit and the results were confirmed by molecular biological analysis. 相似文献
3.
4.
For heavy metals, many studies obtained short biological half-times (BHTs) by administrations of heavy metals. Tsuchiya and Sugita, however, first reported the possibility of a long BHT for cadmium (Cd) calculated from Cd accumulations in postmortem human organs and tissues by age using a non-linear regression method employing a differential equation. According to their reports, the Cd BHTs (point estimators) were 12.1-22.7 years by sex, renal cortex and medulla. The minimums and the maximums of the Cd BHTs on the 95% confidence regions of estimators were 6.9-70.2 years by sex and kidney part. It is presumed that the range of the 95% confidence region for the individual BHTs of renal Cd exists in a range from a few years to at least 100 years because of large individual variations in exposure, absorption rate and excretion rate. Point estimators of BHTs, however, include the assumption that all subjects have been exposed to the same level of Cd at the same year of age over a period of decades and have equal absorption and excretion rates of Cd. Therefore, it is not adequate to calculate a safety level for Cd in the industrial environment or foodstuffs using a value of Cd BHT (point estimator) based on Cd accumulation applying a mathematical model. BHTs of metals require careful evaluation and must not be used indiscriminately to derive a critical concentration, for example, using a mathematical model. 相似文献
5.
A head fixation system using four carbon fiber head pins and modified pin supporting devices is described. The fixation system was developed for intraoperative computed tomographic scanning and provides artifact-free images during open-field neurosurgery. 相似文献
6.
7.
Summary Effects of STA-MCA anastomosis on two patients with neovascular glaucoma due to occlusion of the internal carotid artery are presented. Both patients improved in visual acuity and central retinal artery pressure as well as in signs of transient ischaemic attack. Postoperative angiography showed a marked decrease in collateral flow through the ophthalmic artery, which is reversed from the normal direction, with the development of blood flow through the anastomosis. Discussion is offered indicating that the lack of collateral flow through both the anterior and posterior communicating arteries is important in addition to occlusion of the internal carotid artery in order to produce full-blown ischaemic oculopathy such as venous stasis retinopathy, neovascular glaucoma or rubeosis iridis. It is stressed that EC-IC bypass surgery should be performed soon after the appearance of ischaemia and before the development of neovascular glaucoma or rubeosis iridis in order to obtain normal vision. In ischaemic oculopathy the results of EC-IC bypass can be evaluated objectively and quantitatively by many noninvasive neuro-ophthalmological tests which are important in discussing the efficacy of the bypass surgery. 相似文献
8.
9.
K Kamakura S Ishiura S Imajoh N Nagata H Sugita 《Journal of neuroscience research》1992,31(3):543-548
The ubiquitous existence of calcium-activated neutral protease (CANP, calpain), an enzyme whose activity is regulated by calcium ions and a specific endogenous CANP inhibitor (calpastatin), is well known. Although there has been much investigation concerning the distribution and role of CANP, investigations of the distribution of the CANP inhibitor using immunohistochemical techniques are rare. We made antiserum against a 40K fragment of cDNA corresponding to two C-terminal repeats of rat liver CANP inhibitor expressed in Escherichia coli. Using this antiserum, we examined the distribution of CANP inhibitor in the rat central nervous system by the ABC technique and compared it with the distribution of CANP. Neurons and glias were stained, with the cytosol stained diffusely and the cell membranes stained clearly and strongly. Axons and myelin were stained faintly, but nuclei and vessels were not stained. The distribution of CANP inhibitor was thus found to be similar to that of CANP. 相似文献
10.
A 65-year-old right-handed woman was admitted due to gait disturbance. She had suffered from progressive motor clumsiness in the left-sided limbs for four years. On admission, she was mildly demented, but not aphasic. Neurological examination disclosed constructional disability, limb-kinetic apraxia on the left side, and parkinsonism. Brain CT and MRI showed no responsible lesion. Three-dimensional surface display with 123I-IMP demonstrated decreased cerebral blood flow mainly in the right angular gyrus, and mildly in the right central region. She was clinically diagnosed as having corticobasal degeneration. Hypoperfusion in the angular gyrus and central region may account for constructional disability and limb-kinetic apraxia, respectively. Three-dimensional surface display with 123I-IMP appears to be useful for detecting the cortical region. 相似文献