全文获取类型
收费全文 | 25151篇 |
免费 | 1335篇 |
国内免费 | 166篇 |
专业分类
耳鼻咽喉 | 246篇 |
儿科学 | 484篇 |
妇产科学 | 220篇 |
基础医学 | 3331篇 |
口腔科学 | 590篇 |
临床医学 | 1638篇 |
内科学 | 6452篇 |
皮肤病学 | 534篇 |
神经病学 | 2161篇 |
特种医学 | 1282篇 |
外科学 | 3944篇 |
综合类 | 135篇 |
预防医学 | 758篇 |
眼科学 | 710篇 |
药学 | 1607篇 |
中国医学 | 68篇 |
肿瘤学 | 2492篇 |
出版年
2023年 | 138篇 |
2022年 | 243篇 |
2021年 | 524篇 |
2020年 | 279篇 |
2019年 | 422篇 |
2018年 | 543篇 |
2017年 | 448篇 |
2016年 | 565篇 |
2015年 | 587篇 |
2014年 | 719篇 |
2013年 | 890篇 |
2012年 | 1447篇 |
2011年 | 1598篇 |
2010年 | 904篇 |
2009年 | 742篇 |
2008年 | 1420篇 |
2007年 | 1609篇 |
2006年 | 1514篇 |
2005年 | 1663篇 |
2004年 | 1533篇 |
2003年 | 1552篇 |
2002年 | 1486篇 |
2001年 | 514篇 |
2000年 | 451篇 |
1999年 | 466篇 |
1998年 | 354篇 |
1997年 | 279篇 |
1996年 | 229篇 |
1995年 | 230篇 |
1994年 | 194篇 |
1993年 | 176篇 |
1992年 | 292篇 |
1991年 | 259篇 |
1990年 | 224篇 |
1989年 | 242篇 |
1988年 | 204篇 |
1987年 | 206篇 |
1986年 | 194篇 |
1985年 | 185篇 |
1984年 | 147篇 |
1983年 | 107篇 |
1982年 | 72篇 |
1981年 | 64篇 |
1980年 | 56篇 |
1979年 | 88篇 |
1978年 | 62篇 |
1977年 | 47篇 |
1976年 | 51篇 |
1975年 | 59篇 |
1969年 | 45篇 |
排序方式: 共有10000条查询结果,搜索用时 688 毫秒
101.
Hisayoshi Oka Masayuki Yoshioka Kenji Onouchi Masayo Morita Soichiro Mochio Masahiko Suzuki Toshiaki Hirai Mitsuyoshi Urashima Kiyoharu Inoue 《Movement disorders》2007,22(10):1510-1514
We assessed the relations of visual hallucinations (VH) to cardiovascular autonomic dysfunction in patients with Parkinson's disease (PD). The subjects were 37 patients without VH (VH(-)) and 31 with VH (VH(+)). Autonomic function was evaluated on the basis of cardiac 123-radioiodinated metaiodobenzylguanidine (123I-MIBG) uptake and hemodynamic testing with Valsalva maneuver. Systolic blood pressure (SBP) and plasma norepinephrine concentrations (NE) were measured by tilt-table testing. 123I-MIBG uptake was lower in VH(+) than VH(-). Hemodynamic studies showed that VH(-) had only cardiac sympathetic and parasympathetic dysfunction, while VH(+) additionally had reduced vasomotor sympathetic functions. The fall in SBP during tilt-table testing was greater in VH(+) than VH(-). NE and its difference in the supine and upright positions were decreased in VH(+). We conclude that cardiac and vasomotor sympathetic dysfunction is more severe in VH(+) than in VH(-). Severe dysfunction in PD with VH is probably attributed to Lewy-body lesions or neuronal loss in sympathetic ganglia, the central autonomic system, or both. 相似文献
102.
Keiko Imamura Kenji Wada Kenichi Yasui Kazuhiro Nakaso Yasuhiro Watanabe Hisanori Kowa Kenji Nakashima 《Clinical neurology》2004,44(7):446-449
A 61-year-old man had been treated for malignant fibrous histiocytoma with the pulmonary and the lymph node metastasis in the department of orthopedics in our hospital. He was admitted to our department because of an acute onset of conscious disturbance and non-fluent aphasia. Diffusion-weighted imaging (DWI) showed high signal intensity areas in the bilateral cerebella, thalami and posterior lobes. T2WI did not show any mass effects. Enhanced CT did not reveal any enhanced lesion. He was diagnosed as having cerebral embolism, and his conscious disturbance was improved after medication. Eight weeks later, he presented dysphagia, dysarthria, and ataxia in his extremities. DWI showed multiple lesions of low signal intensity located at the identical place where had showed high signal intensity in the initial DWI. T2WI showed high signal intensity area with mass effect. It was indicated that cerebral metastasis might grow after tumorgenic embolism. This is a rare case that tumor emboluses were developed to the metastatic brain tumors. 相似文献
103.
104.
Masato Nakajima Koji Tsuchiya Yoshihiro Honda Hiroshi Koshiyama Tatsuho Kobayashi 《General thoracic and cardiovascular surgery》2009,57(12):654-656
Although the causes of stroke are diverse, thromboembolism due to a mobile aortic thrombus is rare. We describe a surgical
case of acute massive pulmonary embolism after critical cerebral infarction associated with a mobile ascending aortic thrombus
in a 52-year-old woman. Concomitant surgical removal of the aortic thrombus and pulmonary embolectomy was performed successfully,
and the patient has been stable without recurrent thromboembolic complications after 18 months of follow-up. 相似文献
105.
Kenji Yamao Atsushi Irisawa Hiroyuki Inoue Koji Matsuda Mitsuhiro Kida Shomei Ryozawa Yoshiki Hirooka Teruo Kozu 《Digestive endoscopy》2007,19(Z1):S180-S205
Standard imaging techniques using a curved linear array echoendocope are summarized to facilitate the attainment of expertise in endoscopic ultrasonography and endoscopic ultrasound‐guided fine needle aspiration, and to promote the widespread use of this diagnostic and therapeutic tool. Typical images of the mediastinal organs, the bilio‐pancreatic systems and neighboring organs by scanning from the esophagus, stomach, duodenal bulb, and descending portion of the duodenum, are shown in a sequential manner. The basic techniques of endoscopic ultrasound‐guided fine needle aspiration are also presented. 相似文献
106.
K Hashida K Taniguchi H Miyakawa M Miyamoto S Oda N Honda 《Masui. The Japanese journal of anesthesiology》1990,39(12):1673-1677
This study evaluated the usefulness of midazolam in inducing a anesthetic state in 60 patients who underwent surgery under general anesthesia. The patients were divided into 3 groups; a geriatric group, a hepatic dysfunction group, and a control group (adults without complications). To induce sleep 0.15 mg.kg-1 or 0.2 mg.kg-1 of midazolam was administered intravenously to all three groups. After the administration of midazolam, the mean time for obtaining absence of response to calling name and absence of ciliary reflex were not significantly different in the three groups. The pulse rate and respiratory rate also did not change remarkably. But significant decreases were observed in the systolic blood pressure and tidal volume in all three groups. However, they were not significantly different among the three groups. These results indicate that midazolam is a useful drug for inducing anesthetic state in geriatric patients and patients with hepatic dysfunction. 相似文献
107.
Risk of gallstones following gastrectomy in Japanese men 总被引:3,自引:0,他引:3
Yoichi Ikeda Koichi Shinchi Suminori Kono Kenji Tsuboi Keizo Sugimachi 《Surgery today》1995,25(6):515-518
The risk of gallstones developing after gastrectomy in middle-aged Japanese men was investigated in a study of 2,738 men aged between 48 and 56 years who underwent both gallbladder ultrasonography (US) and a barium study of the upper digestive tract. It was revealed that 61 men had gallstones, 37 had had their gallbladder removed previously, and 55 had a history of gastrectomy. The prevalence of gallstones was 3.5 times higher in the men who had previously undergone gastrectomy (7.7%) than in those who had not (2.2%) (P=0.03). Moreover, gallstones tended to be more prevalent in those who had undergone Billroth II gastrectomy (12.5%) compared with those who had undergone Billroth I gastrectomy (5.6%); however, the difference was not significant. These results indicate that gastrectomy using either Billroth I or Billroth II reconstruction predisposes to gallstone formation. Nevertheless, it was estimated that prior gastrectomy was responsible for no more than 5% of gallstones in the study population. 相似文献
108.
109.
110.
A transparent polyvinyl alcohol (PVA) hydrogel was prepared from a PVA solution in a mixed solvent consisting of water and a water miscible organic solvent by cooling. The physical properties were evaluated in comparison with commercially available soft contact lens materials, such as polyhydroxyethyl methacrylate (PHEMA) and copolymers of methyl methacrylate (MMA) and N-vinyl pyrrolidone (VP). The PVA hydrogel showed higher tensile strength and elongation at break than the other materials, while it had high water content and oxygen permeability the latter being comparable to those of PMMA/VP copolymers. The protein adsorption of the PVA hydrogel was much less than those of the other materials. The PVA hydrogel soft contact lenses were applied on rabbit eyes for 12 weeks. The influence on the cornea was studied by biomicroscopy, ultrasonic corneal pachymetry and histopathological examination. These examinations revealed no abnormal findings in the cornea. These results suggest that the PVA hydrogel may be promising as a new soft contact lens material. 相似文献