全文获取类型
收费全文 | 2766篇 |
免费 | 184篇 |
国内免费 | 4篇 |
专业分类
耳鼻咽喉 | 41篇 |
儿科学 | 75篇 |
妇产科学 | 63篇 |
基础医学 | 327篇 |
口腔科学 | 54篇 |
临床医学 | 341篇 |
内科学 | 482篇 |
皮肤病学 | 141篇 |
神经病学 | 276篇 |
特种医学 | 89篇 |
外科学 | 371篇 |
综合类 | 31篇 |
一般理论 | 3篇 |
预防医学 | 266篇 |
眼科学 | 25篇 |
药学 | 173篇 |
中国医学 | 1篇 |
肿瘤学 | 195篇 |
出版年
2023年 | 35篇 |
2022年 | 62篇 |
2021年 | 118篇 |
2020年 | 53篇 |
2019年 | 90篇 |
2018年 | 89篇 |
2017年 | 68篇 |
2016年 | 74篇 |
2015年 | 73篇 |
2014年 | 96篇 |
2013年 | 143篇 |
2012年 | 176篇 |
2011年 | 204篇 |
2010年 | 95篇 |
2009年 | 80篇 |
2008年 | 156篇 |
2007年 | 148篇 |
2006年 | 153篇 |
2005年 | 118篇 |
2004年 | 124篇 |
2003年 | 124篇 |
2002年 | 88篇 |
2001年 | 33篇 |
2000年 | 24篇 |
1999年 | 44篇 |
1998年 | 18篇 |
1997年 | 13篇 |
1992年 | 22篇 |
1991年 | 27篇 |
1990年 | 18篇 |
1989年 | 18篇 |
1988年 | 18篇 |
1987年 | 25篇 |
1986年 | 18篇 |
1985年 | 13篇 |
1984年 | 25篇 |
1983年 | 17篇 |
1982年 | 14篇 |
1981年 | 17篇 |
1980年 | 13篇 |
1979年 | 15篇 |
1978年 | 13篇 |
1977年 | 11篇 |
1976年 | 14篇 |
1975年 | 11篇 |
1974年 | 15篇 |
1972年 | 13篇 |
1969年 | 10篇 |
1968年 | 12篇 |
1967年 | 10篇 |
排序方式: 共有2954条查询结果,搜索用时 15 毫秒
1.
2.
G Benton R C Thomas B G Nickerson J C McQuitty J Okikawa 《American journal of diseases of children (1960)》1989,143(6):678-681
Studies of adults suggest that metered-dose inhalers with spacers are as effective as hand-held nebulizers for bronchodilator delivery. We studied 13 children with acute asthma. They received two puffs every 2 minutes from metered-dose inhalers with spacers (range, 4 to 14 puffs) titrated until improvement stopped. Peak expiratory flow increased 34% for metered-dose inhalers with spacers after the first 2 puffs and increased 87% for metered-dose inhalers with spacers after dose titration. After titration, respiratory rate decreased by 12%, heart rate increased by 2%, and breath sounds improved in 92% of the patients. We concluded that the metered-dose inhalers with spacers are an effective device for the treatment of asthma in the pediatric emergency department and that the use of metered-dose inhalers with spacers with titration can achieve significant bronchodilation in the treatment of patients with acute asthma. 相似文献
3.
A. Perez S. E. Clements E. Benton A. Robson B. Bhogal C. M. Stefanato D. McGibbon 《Clinical and experimental dermatology》2009,34(8):e931-e933
We report a case of localized bullous pemphigoid (BP) in a woman patient with primary lymphoedema tarda. There is only one previous case reported of localized pemphigoid in an area of lymphoedema, this being of the cicatricial variant. Slow circulation in the lymphatic vessels, increased capillary permeability with preferential localization of antibodies in the area, and potential cleavage of the epidermal junction due to increased hydrostatic pressure leading to autoimmunity, have all been advocated as possible pathogenic mechanisms. Nevertheless, we consider that the mechanism by which localized pemphigoid arises on lymphoedema remains elusive, based on a previous case of generalized BP sparing an area of postsurgical lymphoedema. 相似文献
4.
5.
Noah Simmons Ognjen Brborovic Tozija Fimka Brian D Robie David L Bull Mome Spasovski Edward L Baker 《JPHMP》2005,11(4):351-356
The political disintegration of former Yugoslavia inaugurated in 1991 resulted in the decentralization of health systems in the federation's successor nation-states. Efforts by the Open Society Institute improved public health planning and management needs consequent to health sector changes. Beginning in Croatia in 2001, the Institute developed ongoing collaborations between Andrija Stampar School of Public Health and the US Centers for Disease Control and Prevention. In 2003 and 2004, it expanded its project to include the republics of Macedonia and of Serbia and Montenegro. 相似文献
6.
Noah A Goldman Ellen B Katz Alan S Glenn Richard H Weldon Joan G Jones Uticia Lynch Melissa J Fezzari Carolyn D Runowicz Gary L Goldberg Maureen J Charron 《Modern pathology》2006,19(11):1429-1436
Glucose is provided to cells by a family of glucose transport facilitators known as GLUTs. These transporters are expressed in a tissue specific manner and are overexpressed in many primary tumors of these tissues. Regulation of glucose transport facilitator expression has been demonstrated in endometrial tissue and endometrial adenocarcinoma. The following experiments were conducted to quantify and localize the expression of GLUT1 and GLUT8 in benign endometrium and compare this expression to endometrial cancer. Endometrial tissue samples were obtained from random hysterectomy specimens of patients with benign indications for surgery and endometrial cancer. Immunoblot and immunolocatization studies were performed using GLUT1 and GLUT8 specific antisera. Endometrial samples from 65 women who had undergone hysterectomy were examined (n=38 benign, n=27 malignant). A 44 and a 35.4 kDa immunoreacive species was demonstrated in endometrium and endometrial cancer for GLUT1 and GLUT8, respectively. Upregulation of GLUT1 expression was demonstrated with increasing grade of tumors (P<0.002). GLUT8 expression was increased in all tumor subtypes compared to atrophic endometrium (P<0.001). Apical localization by GLUT1 and GLUT8 was demonstrated in endometrial glands. GLUT1 and GLUT8 demonstrated diffuse intracellular localization in the cancer subtypes. GLUT1 and GLUT8 are expressed in both human endometrium and endometrial cancer. There appears to be a step-wise progression in GLUT1 and GLUT8 expression as tumor histopathology worsens. GLUT1 and GLUT8 may be important markers in tumor differentiation, as well as providing energy to rapidly dividing tumor cells. 相似文献
7.
8.
Mitchell Koolpe Juan J. Rodrigo Hilary P. Benton 《Journal of orthopaedic research》1998,16(2):217-226
Small calcium-mobilizing inflammatory mediators have been implicated in joint pathology. Here we demonstrate that bradykinin, adenosine 5′-triphosphate, uridine 5′-triphosphate, and lysophosphatidic acid raise the intracellular calcium concentration ([Ca2+]i) in human articular chondrocytes. Heterologous cross-desensitization experiments showed that the uridine 5′-triphosphate response was abolished by prior treatment with adenosine 5′-triphosphate and conversely, that the adenosine 5′-triphosphate response was abolished by prior treatment with uridine 5′-triphosphate: this indicated competition for the same receptor site, whereas bradykinin and lysophosphatidic acid did not compete with other ligands. Pretreatment with thapsigargin abolished ligand-mediated Ca2+ responses but not vice versa: this confirmed that Ca2+ release occurred from intracellular stores. Single-cell analysis of Fura-2 acetoxymethyl ester loaded chondrocytes showed mediator-dependent patterns of oscillatory Ca2+ changes in a subset of cells when challenged with submaximal concentrations of bradykinin, adenosine 5′-triphosphate, or uridine 5′-triphosphate in the presence of extracellular Ca2+. However, no oscillatory responses were seen after a challenge with lysophosphatidic acid. Therefore, although a number of different Ca2+-mobilizing ligands activate chondrocytes, the differences that occur in the temporal patterning of Ca2+ responses may result in unique mediator-dependent changes in cellular activity. 相似文献
9.
Gerstmann's syndrome. 总被引:4,自引:0,他引:4
A L Benton 《Archives of neurology》1992,49(5):445-447
Recent case reports describe the occurrence of a more or less pure Gerstmann syndrome in association with a focal lesion in the posterior perisylvian territory of the brain's left hemisphere. In addition, an electrocortical stimulation study reported the Gerstmann symptom combination and a number of other symptom combinations on stimulation of small areas in the left posterior parietotemporal cortex. The neuropsychological implications of these and other recent findings are considered in light of the variety of "syndromes" produced by lesions in this region, the rare occurrence of Gerstmann's syndrome, and its appearance as a consequence of lesions in diverse cerebral areas. 相似文献
10.
A direct in vitro tissue culture method is described for the quantitation of bovine leukemia virus, utlizing a feline S+L-- cell line. 相似文献