全文获取类型
收费全文 | 1916篇 |
免费 | 127篇 |
国内免费 | 12篇 |
专业分类
耳鼻咽喉 | 21篇 |
儿科学 | 75篇 |
妇产科学 | 43篇 |
基础医学 | 214篇 |
口腔科学 | 190篇 |
临床医学 | 136篇 |
内科学 | 400篇 |
皮肤病学 | 40篇 |
神经病学 | 131篇 |
特种医学 | 46篇 |
外科学 | 200篇 |
综合类 | 6篇 |
预防医学 | 275篇 |
眼科学 | 29篇 |
药学 | 134篇 |
中国医学 | 13篇 |
肿瘤学 | 102篇 |
出版年
2023年 | 34篇 |
2022年 | 52篇 |
2021年 | 95篇 |
2020年 | 57篇 |
2019年 | 63篇 |
2018年 | 69篇 |
2017年 | 55篇 |
2016年 | 54篇 |
2015年 | 62篇 |
2014年 | 85篇 |
2013年 | 92篇 |
2012年 | 169篇 |
2011年 | 146篇 |
2010年 | 85篇 |
2009年 | 57篇 |
2008年 | 123篇 |
2007年 | 85篇 |
2006年 | 102篇 |
2005年 | 86篇 |
2004年 | 66篇 |
2003年 | 50篇 |
2002年 | 62篇 |
2001年 | 35篇 |
2000年 | 37篇 |
1999年 | 39篇 |
1998年 | 16篇 |
1997年 | 8篇 |
1996年 | 4篇 |
1994年 | 7篇 |
1993年 | 3篇 |
1992年 | 17篇 |
1991年 | 15篇 |
1990年 | 21篇 |
1989年 | 19篇 |
1988年 | 15篇 |
1987年 | 5篇 |
1986年 | 8篇 |
1984年 | 8篇 |
1983年 | 4篇 |
1980年 | 3篇 |
1979年 | 3篇 |
1978年 | 4篇 |
1976年 | 5篇 |
1974年 | 3篇 |
1971年 | 3篇 |
1970年 | 2篇 |
1969年 | 2篇 |
1968年 | 3篇 |
1967年 | 2篇 |
1965年 | 3篇 |
排序方式: 共有2055条查询结果,搜索用时 531 毫秒
31.
Apical hypertrophic cardiomyopathy with left ventricular apical aneurysm: Importance of multi‐modality imaging 下载免费PDF全文
Nisharahmed Kherada MD Juan M. Vinardell MD Christos G. Mihos DO Orlando Santana MD 《Echocardiography (Mount Kisco, N.Y.)》2017,34(9):1392-1395
Apical hypertrophic cardiomyopathy (HCM) is an uncommon variant of HCM characterized by apical hypertrophy without the septal predominance seen in the majority of HCM cases. In 2% of patients, a concomitant left ventricular apical aneurysm is observed, which increases the risk of sudden death and adverse HCM‐related events. Multimodality imaging is helpful for appropriate identification of this particular morphologic pattern. Herein, we present a case of apical HCM with a left ventricular apical aneurysm, exemplifying the utility of a multimodality approach from resting electrocardiogram, transthoracic echocardiogram, left ventriculography, and cardiac magnetic resonance imaging, for proper risk stratification and treatment planning. 相似文献
32.
Elaine Maria Seles Dorneles Ana Paula Paiva de Faria Rebeca Barbosa Pauletti Jordana Almeida Santana George Afonso Vítor Caldeira Marcos Bryan Heinemann Ricardo Titze-de-Almeida Andrey Pereira Lage 《Vaccine》2013
The aims of the present study were (i) to assess the in vitro genetic stability of S19 and RB51 Brucella abortus vaccines strains and (ii) to evaluate the ability of multiple-locus variable-number tandem repeat (VNTR) analysis (MLVA) as a tool to be used in the quality control of live vaccines against brucellosis. Sixty-three batches of commercial S19 (n = 53) and RB51 (n = 10) vaccines, produced between 2006 and 2009, were used in this study. S19 and RB51 vaccines were obtained from, respectively, seven and two different manufacturers. Ten in vitro serial passages were performed on reference strains and on selected batches of commercial vaccines. All batches, reference strains and strains of serial passages were typed by the MLVA16. The results demonstrated that B. abortus S19 and RB51 vaccine strains are genetically stable and very homogeneous in their respective groups. Anyway, batches of S19 from one manufacturer and batches of RB51 from another presented genotypes distincts from the reference vaccine strains. In both cases, differences were found on locus Bruce07, which had addition of one repeat unit in the case of S19 batches and the deletion of one repeat unit in the case of RB51 batches. In summary, MLVA16 proved to be a molecular tool capable of discriminating small genomic variations and should be included in in vitro official tests. 相似文献
33.
34.
Paulo Roberto Lima Falco do Vale Sheila Cerqueira Hudson P. Santos Beth P. Black Evanilda Souza de Santana Carvalho 《Nursing inquiry》2019,26(1)
The rapidly increasing number of cases of Zika virus and limited understanding of its congenital sequelae (e.g., microcephaly) led to stories of fear and uncertainty across social media and other mass communication networks. In this study, we used techniques generic to netnography, a form of ethnography, using Internet‐based computer‐mediated communications as a source of data to understand the experience and perceptions of families with infants diagnosed with Zika‐related microcephaly. We screened 27 YouTube? videos published online between October 2015 and July 2016, during which the Zika epidemic started, peaked, and declined. We identified three themes: (a) experiencing the news of a diagnosis of Zika‐associated microcephaly; (b) experiencing feelings and expectations of the ‘imperfect’ child; and (c) seeking to understand microcephaly to care for the child. We found that families experienced distressing feelings of shock, sadness, hopelessness, and pain, while dealing with emerging and sometimes conflicting information being transmitted by news outlets, uncertainty about the child's health, and healthcare providers’ lack of clarity to guide the family members. The ‘unknown’ factor of ZIKA was an additional stressful factor in the experience of the families. 相似文献
35.
36.
Fábio Andrey da Costa Araújo Thiago de Santana Santos Hécio Henrique Araújo de Morais José Rodrigues Laureano Filho Emanuel Dias de Oliveira e Silva Ricardo José Holanda Vasconcellos 《Journal of cranio-maxillo-facial surgery》2012,40(8):e346-e349
The aim of this prospective, randomized, controlled, paired trial was to perform a comparative analysis of the preemptive analgesic effect of nimesulide and tramadol chlorhydrate during third molar surgery. The study was carried out between March and November 2009, involving 94 operations in 47 male and female patients with bilateral impacted lower third molars in comparable positions. The sample was divided into two groups. Group A received an oral dose of 100 mg of nimesulide 1 h prior to surgery. Group B received an oral dose of 100 mg of tramadol chlorhydrate 1 h prior to surgery. The following aspects were evaluated in the postoperative period: adverse effects of the drugs; amount of rescue medication used (acetaminophen 750 mg); and pain 5, 6, 24, 36, 48, 60, 72 and 84 h after surgery using a visual analog pain scale. Peak pain occurred 5 h after surgery in both groups, with a mean pain score of 2.3 in Group A and 3.0 in Group B; this difference did not achieve statistical significance (p > 0.141). Based on the sample studied, nimesulide and tramadol chlorhydrate demonstrate similar preemptive analgesic effects when used in lower third molar surgeries. 相似文献
37.
Letícia Zumpano Cardenas Pauliane Vieira Santana Pedro Caruso Carlos Roberto Ribeiro de Carvalho André Luís Pereira de Albuquerque 《Ultrasound in medicine & biology》2018,44(4):786-793
Diaphragm ultrasound (DUS) has been used to identify diaphragm dysfunction. However, its correlations with respiratory strength and lung function are unclear, even in healthy patients. A total of 64 healthy patients (30 males) had lung function and inspiratory strength (maximal inspiratory pressure and sniff nasal inspiratory pressure) measured. Gastric and oesophageal pressures were measured in a subgroup (n?=?40). DUS was characterized by mobility (quiet breathing [QB] and deep breathing [DB]) and thickness (at functional residual capacity [ThFRC] and total lung capacity [ThTLC]). We calculated the thickening fraction (TF). During QB, DUS was similar between sexes. However, during DB, females had lower mobility, thickness and TF than males. Mobility at DB, ThTLC and TF significantly correlated with lung function and inspiratory strength. These correlations were affected by sex. DUS correlated with inspiratory gastric pressure. In healthy patients, DUS correlated with lung function and inspiratory strength during DB. Significant differences between genders were noticeable when DUS was performed during DB. 相似文献
38.
Paulo Ricardo Saquete Martins-Filho Thiago de Santana Santos Vanessa Lessa Cavalcanti de Araújo Joanes Silva Santos Emanuel Sávio de Souza Andrade Luiz Carlos Ferreira da Silva 《Revista brasileira de otorrinolaringologia (English ed.)》2012,78(2):16-21
The traumatic bone cyst is characterized by the presence of an asymptomatic sinus devoid of epithelial lining, which is rarely found in the jaws.ObjectiveTo describe the clinical, surgical and radiographic findings of traumatic bone cysts.Material and MethodA retrospective study was made of patients diagnosed with traumatic bone cysts at an oral pathology department from 1992 to 2007. Data on the clinical, radiographic and surgical complications were gathered.ResultsTwenty-six cases of traumatic bone cyst were diagnosed in 15 years; 17 were male and 09 were female. Most patients were within first two decades of life and had no pain or history of trauma in the affected area. The multilocular pattern was observed in only seven cases, its radiographic appearance suggests a tumor. Air was found inside the lesion in about 70% of cases; serous fluid with blood and blood only were uncommon within the lesions.ConclusionA higher prevalence in young patients, absence of a history of trauma, and a small number of lesions containing serous fluid with blood reflects the need to discuss the true pathogenesis of traumatic bone cysts. 相似文献
39.
40.
José Alexandre da Rocha Curvelo Anna Lea Silva Barreto Camila A. dos Anjos Rafaela S. Santana Ariadne Nunes Alonso Maria Teresa Vilela Romanos Kelly C. G. de Moura Paula Fernandes Carneiro Maristela Barbosa Portela Maria do Carmo F. R. Pinto Rosangela Maria de Araújo Soares 《Medicinal chemistry research》2015,24(3):1155-1161