全文获取类型
收费全文 | 696篇 |
免费 | 39篇 |
国内免费 | 13篇 |
专业分类
耳鼻咽喉 | 4篇 |
儿科学 | 26篇 |
妇产科学 | 4篇 |
基础医学 | 38篇 |
口腔科学 | 38篇 |
临床医学 | 64篇 |
内科学 | 128篇 |
皮肤病学 | 7篇 |
神经病学 | 26篇 |
特种医学 | 182篇 |
外科学 | 49篇 |
综合类 | 40篇 |
预防医学 | 61篇 |
眼科学 | 4篇 |
药学 | 40篇 |
1篇 | |
中国医学 | 8篇 |
肿瘤学 | 28篇 |
出版年
2023年 | 3篇 |
2022年 | 2篇 |
2021年 | 14篇 |
2020年 | 8篇 |
2019年 | 12篇 |
2018年 | 15篇 |
2017年 | 10篇 |
2016年 | 8篇 |
2015年 | 12篇 |
2014年 | 15篇 |
2013年 | 19篇 |
2012年 | 29篇 |
2011年 | 32篇 |
2010年 | 18篇 |
2009年 | 20篇 |
2008年 | 26篇 |
2007年 | 35篇 |
2006年 | 23篇 |
2005年 | 29篇 |
2004年 | 15篇 |
2003年 | 14篇 |
2002年 | 9篇 |
2001年 | 6篇 |
2000年 | 7篇 |
1999年 | 8篇 |
1998年 | 24篇 |
1997年 | 23篇 |
1996年 | 17篇 |
1995年 | 24篇 |
1994年 | 22篇 |
1993年 | 33篇 |
1992年 | 5篇 |
1991年 | 8篇 |
1990年 | 10篇 |
1989年 | 17篇 |
1988年 | 22篇 |
1987年 | 37篇 |
1986年 | 21篇 |
1985年 | 21篇 |
1984年 | 8篇 |
1983年 | 12篇 |
1982年 | 7篇 |
1981年 | 12篇 |
1980年 | 13篇 |
1979年 | 2篇 |
1978年 | 7篇 |
1977年 | 5篇 |
1976年 | 2篇 |
1975年 | 5篇 |
1971年 | 1篇 |
排序方式: 共有748条查询结果,搜索用时 15 毫秒
41.
Paixão CM Reichenheim ME Moraes CL Coutinho ES Veras RP 《Cadernos de saúde pública / Ministério da Saúde, Funda??o Oswaldo Cruz, Escola Nacional de Saúde Pública》2007,23(9):2013-2022
This first of two papers focuses on the first part in the cross-cultural adaptation of the Portuguese-language version of Caregiver Abuse Screen (CASE), a brief instrument for detecting domestic violence against the elderly. CASE was originally developed in Canada and used to screen violence against the elderly by interviewing their caregivers. Besides a broad literature review, the evaluation of conceptual and item equivalences involved expert discussion groups. Semantic equivalence included the following steps: two translations and respective back-translations; an evaluation of referential and general (connotative) equivalence between the original instrument and each version; further discussions with experts in order to define the final version; and pre-testing the latter in 40 caregivers of elderly subjects in an outpatient geriatric clinic. It was possible to establish high-quality conceptual, item, and semantic equivalence for the Portuguese-language version. Although the results shown here were encouraging, they should be reevaluated in light of a forthcoming psychometric analysis (measurement equivalence) to be performed by the research group. 相似文献
42.
Ramos Jr AN Matida LH Saraceni V Veras MA Pontes RJ 《Cadernos de saúde pública / Ministério da Saúde, Funda??o Oswaldo Cruz, Escola Nacional de Saúde Pública》2007,23(Z3):S370-S378
In Brazil, syphilis and HIV infection are considered serious public health problems. However, in practice, epidemiological surveillance, prevention measures, and prenatal care seem to be more effective in the control of mother-to-child transmission of the HIV than in the control of transmission of the Treponema pallidum. Here we discuss the differences in surveillance, prenatal care, and care of the newborn. Important differences were identified. It is concluded that there is an urgent need to establish prevention of mother-to-child transmission of syphilis as a public health priority, using an integrated approach including women's health, children's health, primary health care, and STD/AIDS programs on all governmental levels. These issues also need to be discussed with all stakeholders involved. Important aspects related to the problem are the training of public health professionals, as well as the participation of the community. The elimination of congenital syphilis does not require expensive drugs, and diagnostic tools, but a long-term sustainable approach. 相似文献
43.
为探讨体外循环(CPB)导致心脏植物神经系统(CAS)损伤的机理,了解温血心停跳液能否防止CPB后心率变异性(HRV)的降低,采用对照方法观察了温血心停跳液与冷晶体心停跳液对狗HRV的影响。结果显示:CPB后温血心停跳液组(WB组)和冷晶体心停跳液组(CC组)的全频谱(TP)、低频(LF)和高频(HF)均较术前明显降低(P<0.05),而且CC组比WB组降低更明显(P<0.05),但LF/HF在组内及组间均无明显变化(P>0.05)。CPB后24小时平均心率(MHR)明显增加(P<0.05),且CC组高于WB组(P<0.05)。本研究表明:采用温血心停跳液或冷晶体心停跳液的CPB不会干扰CAS平衡,但均能使HRV降低,温血心停跳液不能防止HRV损害。 相似文献
44.
R P Veras 《Revista de saúde pública》1991,25(6):476-488
Population ageing is currently a phenomenon not only in developed countries but also in third world countries. In this paper the features of a population's ageing and the process of epidemiological transition are discussed along with the worldwide changes in age-structure. Population statistics in Brazil and the characteristics of the elderly population are presented and analysed in the light of recent changes. The Brazilian elderly population is also discussed, particularly the issues relating to the social cost of the aged population, its urban and rural distribution, the elderly by sex, marital status and level of schooling, and emphasis is given to the imbalance of the sexes and the consequences of it for women. 相似文献
45.
46.
47.
48.
In five patients, aged 4 days to 20 months, the left pulmonary artery was inadvertently ligated at the time of attempted closure of the patent ductus arteriosus. The complication was recognized in these patients between 1 day and 5 years later from findings of chest radiography, two-dimensional echocardiography with spectral analysis of Doppler shifted echoes, and angiography. In three patients, the presence of asymmetric pulmonary blood flow on chest radiographs obtained after surgery initially suggested the diagnosis. In the other two patients with bronchopulmonary dysplasia, the diagnosis was made by means of two-dimensional echocardiography and Doppler spectra in one and angiography in the other. On angiograms, the left pulmonary artery distal to the ligation was visualized by delayed opacification from aortic collaterals in three patients and by means of pulmonary venous wedge injection in one. Radiographic and echocardiographic examination with Doppler spectra may permit prompt diagnosis and early correction of this complication. 相似文献
49.
Head and neck lesions: MR-guided aspiration biopsy 总被引:1,自引:0,他引:1
Duckwiler G; Lufkin RB; Teresi L; Spickler E; Dion J; Vinuela F; Bentson J; Hanafee W 《Radiology》1989,170(2):519-522
Aspiration biopsy guided with computed tomography (CT) has long been a valuable tool in the evaluation of head and neck disease. The ability to obtain diagnoses without the need for surgery has had a significant effect on patient treatment. Magnetic resonance (MR) imaging is now rapidly replacing CT as the primary imaging study for many head and neck diseases. The standard stainless steel needles used for CT-guided biopsy are unsuitable for MR-guided biopsy because significant ferromagnetic artifacts obscure the underlying anatomy. A new needle has recently been designed specifically for use with MR imaging. This needle has far less magnetic susceptibility and therefore does not cause significant image distortion. The authors describe the use of this needle in MR-guided aspiration biopsy of a variety of lesions in the head and neck. 相似文献
50.
Tongue and oropharynx: findings on MR imaging 总被引:6,自引:0,他引:6
Lufkin RB; Wortham DG; Dietrich RB; Hoover LA; Larsson SG; Kangarloo H; Hanafee WN 《Radiology》1986,161(1):69-75
Ten healthy subjects and 44 patients with diseases of the tongue or oropharynx were studied with magnetic resonance (MR) imaging. Axial, coronal, and sagittal images with a thickness of 4 mm were obtained with a pixel size of 0.75 X 0.75 mm on a 256 matrix. Nineteen of the patients underwent computed tomography (CT). Nine of those patients later had surgery, and the specimens were obtained for organ sectioning. These three studies as well as clinical history and physical examination findings were correlated. MR imaging was equal to or better than CT in those patients having both examinations. However, neither CT nor MR allowed recognition of histologic features or detection of microscopic spread of disease. Direct coronal and sagittal imaging planes on MR imaging allowed visualization of intrinsic tongue musculature, not possible with CT; this was important in recognizing subtle tumor extension. For these reasons, MR is the imaging method of choice for studying diseases of the tongue and oropharynx. 相似文献