全文获取类型
收费全文 | 377篇 |
免费 | 52篇 |
国内免费 | 33篇 |
专业分类
耳鼻咽喉 | 6篇 |
儿科学 | 29篇 |
妇产科学 | 2篇 |
基础医学 | 49篇 |
口腔科学 | 14篇 |
临床医学 | 63篇 |
内科学 | 81篇 |
皮肤病学 | 1篇 |
神经病学 | 21篇 |
特种医学 | 56篇 |
外科学 | 27篇 |
综合类 | 22篇 |
预防医学 | 17篇 |
眼科学 | 9篇 |
药学 | 48篇 |
中国医学 | 1篇 |
肿瘤学 | 16篇 |
出版年
2020年 | 3篇 |
2019年 | 4篇 |
2018年 | 4篇 |
2017年 | 8篇 |
2016年 | 4篇 |
2015年 | 6篇 |
2014年 | 14篇 |
2013年 | 13篇 |
2012年 | 9篇 |
2011年 | 10篇 |
2010年 | 13篇 |
2009年 | 16篇 |
2008年 | 15篇 |
2007年 | 24篇 |
2006年 | 12篇 |
2005年 | 12篇 |
2004年 | 6篇 |
2003年 | 9篇 |
2002年 | 7篇 |
2001年 | 6篇 |
2000年 | 3篇 |
1999年 | 18篇 |
1998年 | 14篇 |
1997年 | 18篇 |
1996年 | 18篇 |
1995年 | 15篇 |
1994年 | 19篇 |
1993年 | 14篇 |
1992年 | 13篇 |
1991年 | 11篇 |
1990年 | 5篇 |
1989年 | 14篇 |
1988年 | 10篇 |
1987年 | 10篇 |
1986年 | 7篇 |
1985年 | 8篇 |
1984年 | 3篇 |
1983年 | 3篇 |
1982年 | 3篇 |
1981年 | 11篇 |
1979年 | 4篇 |
1977年 | 8篇 |
1976年 | 3篇 |
1975年 | 7篇 |
1974年 | 4篇 |
1973年 | 3篇 |
1971年 | 3篇 |
1970年 | 3篇 |
1968年 | 2篇 |
1967年 | 2篇 |
排序方式: 共有462条查询结果,搜索用时 24 毫秒
21.
Stef PJ Kremers Gert-Jan de Bruijn Tommy LS Visscher Willem van Mechelen Nanne K de Vries Johannes Brug 《The international journal of behavioral nutrition and physical activity》2006,3(1):9
Background
Studies on the impact of the 'obesogenic' environment have often used non-theoretical approaches. In this journal's debate and in other papers authors have argued the necessity of formulating conceptual models for differentiating the causal role of environmental influences on behavior. 相似文献22.
B Setty MA Blake NS Holalkere LS Blaszkowsky A Fischman 《Journal of Medical Imaging and Radiation Oncology》2006,50(5):507-509
Positron emission tomography/CT is an established imaging method in the diagnosis and staging of cancers. 18F‐fluoro‐2‐deoxy‐d ‐glucose (FDG) is the most commonly used radiotracer in positron emission tomography/CT. It is a tumour viability agent and usually its uptake within a lesion reflects the presence of a viable tumour tissue. However, false‐positive FDG uptake is known to occur in benign processes of either inflammatory or infectious aetiology. We describe FDG uptake at the site of laparoscopic scar that mimicked Sister Mary Joseph’s nodule in a patient with gastric adenocarcinoma. Here, the knowledge of the patient’s history and subtle imaging findings helped in accurate staging of the patient. In this case report, we emphasize the value of the knowledge of the patient history and awareness of different pitfalls of FDG to achieve a correct diagnosis on positron emission tomography/CT. 相似文献
23.
Unilateral haemorrhagic parenchymal lesions in the preterm infant: shape, site and prognosis 总被引:2,自引:0,他引:2
KJ Rademaker F Groeneadaal GH Jansen P Eken LS De Vries 《Acta paediatrica (Oslo, Norway : 1992)》1994,83(6):602-608
Rademaker KJ, Groenendaal F, Jansen GH, Eken P, de Vries LS. Unilateral haemorrhagic parenchymal lesions in the preterm infant: shape, site and prognosis. Acta Pædiatr 1994;83:602–8. Stockholm. ISSN 0803–5253 In a prospective cranial ultrasound study of 544 infants with a gestational age of 32 weeks or less, 20 (3.6%) infants were diagnosed as having a unilateral parenchymal lesion (PL). Based on the shape of the PL and the evolution on ultrasound, the infants were divided into three groups: group I consisted of 11 infants, in whom the PL was triangular/fan-shaped and separate from the ventricle. The PL evolved into small cystic lesions; group II comprised 3 infants who had a PL with a similar shape, but partially communicating with the ventricle; group III consisted of 6 infants who had a globular-shaped lesion in communication with the ventricle. In groups II and III, the PL evolved into one porcncephalic cyst. The PL was considered to be due to venous infarction in all cases with intraventricular haemorrhage preceding the PL in 7 cases. Sixteen infants survived. A postmortem was performed in 2 of the 4 infants who died, confirming the diagnosis of venous infarction. Neurologicdl sequelae were present in only 2 cases in the first group, while all 6 survivors of the other two groups developed mild to severe hemiplegia. Long-term follow-up was not always available and 4 of the 18 survivors were still less than 18 months when last seen. In 9 of the 11 infants in group I, the PL was localized in the frontoparietal region, while in 8 of the 9 infants in group II or III, the PL was beyond the trigone in the occipital region. The outcome of the unilateral PL is not always unfavourable. It was evident that not only the shape of the lesion and whether or not there was communication with the lateral ventricle, but also the site of the lesion (whether or not it extended into the occipital periventricular white matter) appeared to be important with regard to neurodevelopmental outcome. 相似文献
24.
25.
26.
27.
28.
29.
We describe a middle-aged Chinese systemic lupus erythematosus (SLE) patient developing steroid refractory and transfusion dependent red cell aplasia. Oral danazol 200 mg twice per day was started together with low-dose prednisolone therapy. There was no further recurrence of anemia 1 month after this combined therapy. 相似文献
30.
BACKGROUND: Secretory immunoglobulin A (SIgA) is the principal immunologic defense of respiratory and other mucosal surfaces in the body. SIgA is relatively stable in mucosal secretions. However, cleavage of SIgA by bacterial proteases might render it immunologically inactive and thus contribute to the development of pneumonia as well as other infections. Bacterial species and infection sites might be important in the expression of bacterial protease activity and serve as the impetus to this study. METHODS: Bacterial isolates from respiratory and nonrespiratory sites were incubated with SIgA in vitro. SIgA degradation was determined by size exclusion ultrafiltration and gel electrophoresis. RESULTS: IgA protease activity was evident in gram-negative but not gram-positive respiratory isolates. Gram-negative isolates from nonrespiratory sources did not exhibit IgA protease activity. CONCLUSIONS: Expression of IgA protease activity might be important in the development and subsequent outcome of gram-negative pneumonia in the patient in the surgical intensive care unit. 相似文献