全文获取类型
收费全文 | 6028篇 |
免费 | 339篇 |
国内免费 | 25篇 |
专业分类
耳鼻咽喉 | 66篇 |
儿科学 | 113篇 |
妇产科学 | 80篇 |
基础医学 | 869篇 |
口腔科学 | 144篇 |
临床医学 | 384篇 |
内科学 | 1617篇 |
皮肤病学 | 40篇 |
神经病学 | 379篇 |
特种医学 | 236篇 |
外科学 | 1080篇 |
综合类 | 44篇 |
预防医学 | 213篇 |
眼科学 | 152篇 |
药学 | 335篇 |
中国医学 | 14篇 |
肿瘤学 | 626篇 |
出版年
2023年 | 39篇 |
2022年 | 78篇 |
2021年 | 146篇 |
2020年 | 46篇 |
2019年 | 75篇 |
2018年 | 112篇 |
2017年 | 86篇 |
2016年 | 101篇 |
2015年 | 105篇 |
2014年 | 144篇 |
2013年 | 188篇 |
2012年 | 275篇 |
2011年 | 358篇 |
2010年 | 169篇 |
2009年 | 180篇 |
2008年 | 283篇 |
2007年 | 325篇 |
2006年 | 292篇 |
2005年 | 276篇 |
2004年 | 303篇 |
2003年 | 282篇 |
2002年 | 302篇 |
2001年 | 173篇 |
2000年 | 214篇 |
1999年 | 174篇 |
1998年 | 76篇 |
1997年 | 82篇 |
1996年 | 60篇 |
1995年 | 49篇 |
1994年 | 62篇 |
1993年 | 36篇 |
1992年 | 110篇 |
1991年 | 92篇 |
1990年 | 113篇 |
1989年 | 95篇 |
1988年 | 95篇 |
1987年 | 96篇 |
1986年 | 80篇 |
1985年 | 109篇 |
1984年 | 68篇 |
1983年 | 50篇 |
1982年 | 28篇 |
1979年 | 38篇 |
1978年 | 36篇 |
1977年 | 22篇 |
1975年 | 21篇 |
1973年 | 28篇 |
1971年 | 24篇 |
1969年 | 28篇 |
1968年 | 29篇 |
排序方式: 共有6392条查询结果,搜索用时 15 毫秒
1.
2.
3.
H Murakami M Togawa S Takahashi N Kasahara J Yamamoto N Matsuura Y Koshiyama Y Ino M Oda 《Arzneimittel-Forschung》1990,40(12):1352-1358
The effects of FUT-187 (6-amidino-2-naphthyl 4-[(4,5-dihydro-1H-imidazol-2-yl)amino]benzoate dimethanesulfonate, CAS 103926-82-5), a novel synthetic protease inhibitor, were examined in experimental rat and canine models of pancreatitis. 1. FUT-187 significantly increased the survival of rats with trypsin- and phospholipase A2-induced pancreatitis in a dose-dependent manner (10-100 mg/kg, p.o.). 2. FUT-187 decreased plasma enzymatic activity reflecting the degree of pancreatitis in rats with ethionine-induced pancreatitis, and showed a tendency to ameliorate histopathological changes in the pancreas (10-100 mg/kg p.o.). 3. FUT-187 (10 mg/kg) produced an obvious improvement of various biochemical parameters of pancreatitis and also reduced histopathological changes in the pancreas in animals with experimental pancreatitis produced by the closed duodenal loop method. In addition, FUT-187 significantly increased the survival of dogs when given by direct administration into the lumen of the closed duodenal loop. The therapeutic effects of FUT-187 in experimental pancreatitis were nearly equal in most instances to those of camostat mesilate. Thus, FUT-187 would appear to be an effective new agent for the treatment of pancreatitis. 相似文献
4.
Fumihiko Iwaku 《Journal of bone and mineral metabolism》1989,7(1):7-11
The three dimensional vascular microarchitecture of mercox resin on the lateral surface of parietal bone in Wistar strain
adult male rats (b. w. 260–350 g.) was studied in relation to bone formation by SEM observation of corrosion casts.
The microarchitecture was a single layer of network composed of precapillary artery, capillary and postcapillary vein, which
were serpigious, sometimes joined with the vein from the vascular foramen of bone. The meshes of this network, which were
irregular and varied in size, existed apart from the bone surface.
According to the report of Iwaku and Ozawa (1986), it was reported that the vascular microarchitecture of the bone surface
was very changable during the process of bone remodeling and this network, which was shown on the flat bone surface in this
study, was very similar to one in the resting phase and/or the period in which the bone formation further advanced.
From these facts and the morphological features of the bone surface observed here by SEM, it is suggested that this vascular
network was closely related with the resting stage and/or the period in which bone formation further advanced in bone remodeling. 相似文献
5.
Hiroaki Matsuura Hizuru Miyamoto Kenichi Kurita Alastair N Goss 《Journal of oral and maxillofacial surgery》2006,64(10):1517-1525
PURPOSE: The purpose of this study was to test the functional and histologic fate of costochondral grafts (CG) in temporomandibular joint (TMJ) reconstruction for unilateral ankylosis in the sheep. MATERIALS AND METHODS: Five pure-bred adult Merino sheep were used. Ankylosis was induced by articular damage, disc removal, and placement of a bone graft. At 3 months, a gap arthroplasty was performed with a CG from the thirteenth rib. The sheep were sacrificed 3 months after CG reconstruction. The range of jaw movements were recorded at first operation, at lysis of ankylosis, and at sacrifice. The joints were examined radiologically, macroscopically, and histologically. RESULTS: All sheep showed a decrease in masticatory function, as shown by weight loss and decreased jaw opening, during the ankylosis period. On release, they regained weight and increased the range of jaw movement. Histologically, the joint space was filled with fibrous tissue. However, the partial spaces around the CG head were covered by fibrous tissue and/or fibrous cartilage. CONCLUSIONS: This study shows that, when CGs are used with a gap arthroplasty in a fibrous and bony ankylosed TMJ, masticatory function is restored. 相似文献
6.
R Hattori O Matsuura N Takeuchi J Hashimoto S Ohshima Y Ono S Yamada T Kinukawa K Miyake 《Nihon Hinyōkika Gakkai zasshi. The japanese journal of urology》1991,82(5):810-815
As a prospective study on asymptomatic microhematuria, complete urological examinations including cystoscopy, IVP, ultrasound and urinary cytology were performed on 422 patients over 40 years old between January 1987 and December 1988 (group A). The results of group A was compared with that of retrospective study on 266 patients, who had incomplete urological examination between January 1984 and December 1985 (group B). Cystoscopy was performed on 321 patients (87.2%) in group A and on 108 patients (40.6%) in group B. Bladder tumor was found in 10 cases (2.4%) in group A, including 7 cases of male patients (5.7%), but in only 1 case (0.4%) in group B. Since the negative rate of abnormal urinary cytology was 50% and that of abnormal IVP was 90% in 10 cases of bladder tumor in group A, cystoscopy was considered to be an essential examination for the screening of patients with asymptomatic microhematuria over 40 years old patients. 相似文献
7.
8.
Masato Matsuura 《Brain and nerve》2007,59(2):147-156
Ten newer antiepileptic drugs have been developed since 1990s. These drugs have wider therapeutic spectra, fewer side-effects, and lesser drug-to-drug interactions compared with the older typical antiepileptic drugs. Among them, zonisamide was developed in Japan and has been used from 1989. Gabapentin was at length approved in 2006. The other newer antiepileptic drugs are not approved yet in Japan. Felbamate can not be used in Europe because it may induce lethal hepatic toxicity and aplastic anemia. Vigabatrin is not approved in USA because it may induce permanent visual field deficit. The USA guideline for epilepsy treatment recommends that patients with newly diagnosed epilepsy can be treated with gabapentin, lamotrigine, topiramate, and oxcarbazepine. In contrast, based on epilepsy treatment guideline in England, newer antiepileptic drugs are considered only when patients with newly diagnosed epilepsy are unable to use the older antiepileptic drugs for some reasons. All newer antiepileptic drugs are used for intractable partial epilepsies, and lamotrigine and topiramate can also be used for idiopathic generalized epilepsies. The response rate (seizure reduction rate with 50% or more) and drop-out rate are overlapping among all newer antiepileptic drugs. Gabapentin, levetiracetam, and pregabalin are eliminated from kidney, and they had no drug-to-drug interactions and can be titrated rapidly. The serum concentration of lamotrigine is decreased with co-administration of hepatic enzyme inducing drugs and is increased with co-administration of valproic acid. Hypersensitivity reactions are rare with gavapentin, levetiracetam, topiramate, and tiagabin. Psychoses are reported to be induced with zonisamide, however, they can be induced with the other newer drugs (topiramate, levetiracetam, etc.). Drug-induced psychiatric symptoms, especially depression, may be often underdiagnosed. Many of these newer drugs (gabapentine, lamotrigine, levetiracetam, oxycarbazepine, etc.) have effects on chronic neuropathic pain. Some newer drugs show mood stabilizing effects (lamotrigine, oxycarbazepine, etc.), or antianxiety effect (gabapentin, topiramate, levetiracetam, pregavalin, etc.). Wide range of action to central nervous system of these newer antiepileptic drugs may serve not only for clinical seizure suppression, but also for neuroprotection. 相似文献
9.
Yuichi Sanada Kazuhiro Yoshida Hiroyuki Itoh Satoko Kunita Kazuto Jinushi Hideo Matsuura 《Journal of hepato-biliary-pancreatic sciences》2007,14(4):401-409
We report a case of groove pancreatitis (GP) associated with a true pancreatic cyst. An 81-year-old man who had suffered epigastric pain for 4 months was referred to Saisekai Kure Hospital. Computed tomography and endoscopic retrograde pancreatography showed a cystic lesion in the groove area of the pancreas. Serum amylase elevation and imaging findings suggested GP due to the cyst. Six weeks of medical treatment did not improve the clinical symptoms. Therefore, pancreatoduodenectomy was performed. Histologic examination revealed a true cyst with intraluminal necrosis, which produced a protein plug that obstructed the Santorini duct. The parenchyma surrounding the groove area showed marked fibrosis and inflammatory cell infiltration. GP due to true pancreatic cyst was diagnosed. Although GP is usually caused by overconsumption of alcohol, which leads to changes in the pancreatic juice and the ultimate blockage of pancreatic outflow, the histologic features in our patient suggest that true pancreatic cyst stands as a secondary cause of GP. 相似文献
10.
Takeshi Matsumoto Takahisa Asano Mami Takemoto Hiroyuki Tachibana Yasuo Ogasawara Fumihiko Kajiya 《Applied radiation and isotopes》2007,65(8):910-917
Using (3)H- and (125)I-labeled desmethylimipramine (DMI) for regional flow tracers, we established a two-time measurement method for the spatial pattern of myocardial perfusion in cross-circulated rat hearts. Myocardial extractions and retentions of these tracers were confirmed to be satisfactory; however, the latter were less than 90% after 3 min at a perfusion rate of 2.9 ml/min/g, limiting the present application to a short-time perfusion measurement. Distributions of myocardial depositions were separated by subtraction digital radiography with 400-microm pixel resolution. Its feasibility was examined by regression analysis between local deposition densities of (3)H- and (125)I-DMI injected simultaneously. The slope, y-intercept, and correlation coefficient (r) of the regression line were 0.98+/-0.04, 0.02+/-0.04, and 0.95+/-0.03, respectively, indicating the validity of the present image subtraction technique. The spatial pattern of myocardial perfusion in response to flow reduction was evaluated by the injections of (3)H- and (125)I-DMI, respectively, before and after a nearly 70% flow reduction. A significant correlation between normalized density distributions of these tracers was found in both subepicardium (r=0.77+/-0.12) and subendocardium (r=0.73+/-0.20), indicating the stable pattern of myocardial perfusion. However, the coefficient of variation of tracer densities showed a decrease of subendocardial flow heterogeneity from 35+/-15% to 31+/-16%. Thus, flow differences between originally high- and low-flow regions in subendocardium were reduced on a relative basis during low perfusion. 相似文献