全文获取类型
收费全文 | 1102篇 |
免费 | 97篇 |
国内免费 | 7篇 |
专业分类
耳鼻咽喉 | 5篇 |
儿科学 | 38篇 |
妇产科学 | 32篇 |
基础医学 | 127篇 |
口腔科学 | 38篇 |
临床医学 | 132篇 |
内科学 | 215篇 |
皮肤病学 | 38篇 |
神经病学 | 51篇 |
特种医学 | 98篇 |
外科学 | 133篇 |
综合类 | 55篇 |
预防医学 | 83篇 |
眼科学 | 25篇 |
药学 | 61篇 |
肿瘤学 | 75篇 |
出版年
2021年 | 13篇 |
2020年 | 10篇 |
2019年 | 12篇 |
2018年 | 22篇 |
2017年 | 12篇 |
2016年 | 15篇 |
2015年 | 24篇 |
2014年 | 28篇 |
2013年 | 49篇 |
2012年 | 43篇 |
2011年 | 39篇 |
2010年 | 42篇 |
2009年 | 49篇 |
2008年 | 36篇 |
2007年 | 42篇 |
2006年 | 55篇 |
2005年 | 36篇 |
2004年 | 56篇 |
2003年 | 30篇 |
2002年 | 29篇 |
2001年 | 24篇 |
2000年 | 21篇 |
1999年 | 18篇 |
1998年 | 32篇 |
1997年 | 31篇 |
1996年 | 28篇 |
1995年 | 37篇 |
1994年 | 20篇 |
1993年 | 14篇 |
1992年 | 18篇 |
1991年 | 14篇 |
1990年 | 22篇 |
1989年 | 26篇 |
1988年 | 36篇 |
1987年 | 34篇 |
1986年 | 18篇 |
1985年 | 18篇 |
1984年 | 17篇 |
1983年 | 17篇 |
1982年 | 6篇 |
1981年 | 12篇 |
1980年 | 10篇 |
1979年 | 8篇 |
1978年 | 9篇 |
1977年 | 9篇 |
1974年 | 5篇 |
1973年 | 8篇 |
1972年 | 8篇 |
1971年 | 8篇 |
1968年 | 5篇 |
排序方式: 共有1206条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
The first 150 words of the full text of this article appear below. Key points Coronary artery disease accounts for >30% ofdeaths in Western society. The diagnosis of myocardial infarctionshould be qualified by size, causation and time from occurrence. Mortalityis reduced by immediate or primary percutaneouscoronary intervention or thrombolysis within the first 24 hof onset of ST-segment elevation myocardial infarction. Strategiesto reduce platelet activation (glycoprotein IIb/IIIa receptorantagonists, or clopidogrel) are now recommended in the treatmentof high-risk non-ST-segment myocardial infarction/unstable angina. Elevatedserum troponins may be the result of non-ischaemic myocardialdamage, especially in critical illness.
Pathophysiology
Changes in the definition of terms relating to the diagnosisof myocardial infarction (MI) have evolved by better understandingof the pathophysiology culminating in the new term of acutecoronary syndrome (ACS). Figure 1 illustrates the processesthat occur in the development of an acute coronary event. 相似文献
6.
AIM--To investigate the distribution of cytokeratins 10, 13, 14 and 19 in biopsy specimens taken from acetowhite and non-acetowhite areas of the cervix. METHOD--Cervical biopsy specimens were taken from both acetowhite and non-acetowhite areas from 44 patients who presented with abnormal cervical cytology. The specimens were snap frozen in liquid nitrogen and multiple sections taken from each specimen. Staining was performed for cytokeratins 10, 13, 14, 19 and NADPH diaphorase enzyme. The areas of each section positive for the various markers were measured. RESULTS--Cytokeratin 10 positive cells were greatly increased in number in acetowhite biopsy specimens compared with non-acetowhite samples (45.1% v 2.8%; p < 0.0001). Cytokeratin 19 was also increased, but to a lesser extent (17.8% v 5.5%; p < 0.0001). In contrast, the almost universal expression of cytokeratin 13 was reduced in acetowhite biopsy specimens (86.2% v 96.9%; p < 0.0001). Cytokeratin 14 was found diffusely in the basal region of the stratified squamous epithelium and was marginally more apparent in the acetowhite biopsy specimens (p = 0.04). CONCLUSION--It is suggested that the presence of cytokeratin 10 may be an essential requirement for the formation of acetowhite change in association with the cellular swelling caused by acetic acid. 相似文献
7.
8.
The meaning of spirituality: a literature review 总被引:1,自引:0,他引:1
Jane Dyson MEd BA RGN DipN RNT Mark Cobb BSc Dawn Forman MBA PGDip TDCR MDCR 《Journal of advanced nursing》1997,26(6):1183-1188
This paper presents a literature review in relation to the meaning of spirituality. It is proposed that meeting the spiritual needs of patients is a fundamental part of providing holistic nursing care, but that the assessment and meeting of those needs is impeded by inadequate definitions and conceptual frameworks. It should not be assumed that spirituality is either synonymous, or coterminous, with religion, and it is suggested that to adopt this restrictive view is unhelpful in the provision of individualized care. Reflection on the literature reveals that the self, others and 'God' provide the key elements within a definition of spirituality, and that other emerging themes namely meaning, hope, relatedness/connectedness, beliefs/belief systems and expressions of spirituality, can be articulated in the context of those three key elements. In particular, it is proposed that the nature of 'God' may take many forms and, essentially, is whatever an individual takes to be of highest value in his/her life. It is suggested that the themes emerging from the literature can be utilized as a framework to give practitioners and researchers a direction for future exploration of the concept of spirituality. 相似文献
9.
Berbaum KS; el-Khoury GY; Franken EA Jr; Kathol M; Montgomery WJ; Hesson W 《Radiology》1988,168(2):507-511
The effect of knowledge of localizing symptoms and signs in the detection of fractures was studied. Forty radiographs of the extremities were examined twice by seven radiologists; the sessions were separated by 4 months. In 26 cases, a subtle fracture was present; 14 cases were normal. In half of the cases at each session, the precise location of pain, tenderness, or swelling was provided. The observer was asked to determine if the case was normal or abnormal (provide the exact location of the fracture) and to indicate the degree of confidence in the diagnosis. Responses were converted to a numeric scale for analysis. Analysis of receiver operator characteristic parameters indicates that clues regarding location of trauma facilitate detection of fractures. The improvement is based largely on an increased true-positive rate without an increased false-positive rate, regardless of the decision criteria of the radiologist (overall willingness to "overread" or "underread"). This has direct clinical applicability and reinforces the plea of radiologists for precise clinical information. 相似文献
10.
Herniation of mucosal epithelium into the submucosa in chronic ulcerative colitis. 总被引:1,自引:2,他引:1
下载免费PDF全文
![点击此处可从《Journal of clinical pathology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
J L Dyson 《Journal of clinical pathology》1975,28(3):189-194
Herniation of the glandular epithelium into the submucosa has been observed in 11 out of 27 cases of chronic ulcerative colitis. Glandular herniation was associated with thickening of the muscularis mucosae, with interruption of the muscularis mucosae by lymphoid follicles, and, in five of the 11 cases, with significant crowding of the glands of the mucosa. This study strongly suggests that sustained contraction of the muscularis mucosae, which has been shown by others to be a major feature of chronic ulcerative colitis, is the prime factor in the formation of downgrowths or herniations of the glandular epithelium into the submucosa. Comparison of the cases in which cancer developed with those where there was glandular herniation led to the conclusion that they are independent associations of chronic ulcerative colitis, and that glandular herniation plays no part in the development of dysplasia or cancer. 相似文献