全文获取类型
收费全文 | 934篇 |
免费 | 63篇 |
国内免费 | 6篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 25篇 |
妇产科学 | 19篇 |
基础医学 | 92篇 |
口腔科学 | 27篇 |
临床医学 | 98篇 |
内科学 | 186篇 |
皮肤病学 | 11篇 |
神经病学 | 39篇 |
特种医学 | 95篇 |
外科学 | 152篇 |
综合类 | 52篇 |
预防医学 | 84篇 |
眼科学 | 6篇 |
药学 | 64篇 |
肿瘤学 | 52篇 |
出版年
2021年 | 13篇 |
2020年 | 6篇 |
2019年 | 8篇 |
2018年 | 20篇 |
2017年 | 15篇 |
2016年 | 8篇 |
2015年 | 13篇 |
2014年 | 20篇 |
2013年 | 41篇 |
2012年 | 44篇 |
2011年 | 34篇 |
2010年 | 45篇 |
2009年 | 44篇 |
2008年 | 30篇 |
2007年 | 24篇 |
2006年 | 44篇 |
2005年 | 22篇 |
2004年 | 48篇 |
2003年 | 24篇 |
2002年 | 20篇 |
2001年 | 19篇 |
2000年 | 14篇 |
1999年 | 15篇 |
1998年 | 25篇 |
1997年 | 25篇 |
1996年 | 24篇 |
1995年 | 31篇 |
1994年 | 18篇 |
1993年 | 10篇 |
1992年 | 18篇 |
1991年 | 14篇 |
1990年 | 14篇 |
1989年 | 23篇 |
1988年 | 17篇 |
1987年 | 19篇 |
1986年 | 28篇 |
1985年 | 8篇 |
1984年 | 15篇 |
1983年 | 15篇 |
1982年 | 8篇 |
1981年 | 9篇 |
1980年 | 10篇 |
1979年 | 6篇 |
1978年 | 11篇 |
1977年 | 12篇 |
1976年 | 7篇 |
1974年 | 6篇 |
1972年 | 9篇 |
1968年 | 5篇 |
1967年 | 8篇 |
排序方式: 共有1003条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
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
5.
6.
K J Franklin R J Buist J den Hartog G A McRae D P Spencer 《International journal of hyperthermia》1992,8(2):253-262
A temperature probe based on the magnetic resonance properties of an encapsulated liquid crystal has been investigated. Large changes in magnetic resonance signals occur as the liquid crystal undergoes a phase transition from an anisotropic (nematic) state to the isotropic liquid. The low latent heat of such phase transitions allows for rapid phase changes during a hyperthermia treatment. Transition temperatures can be tailored by adding suitable compounds such as analogues of the liquid crystal or various solvents. Encapsulation is required to maintain the integrity of the liquid crystal, particularly for applications in vivo. Results of preliminary studies designed to demonstrate the technical feasibility of the concept are presented. 相似文献
7.
8.
Thirty-one consecutive patients with primary non-Hodgkin's lymphoma of the stomach were studied to outline the spectrum of endoscopic abnormalities. The 17 men and 14 women had a median age of 65 years. There were 22 patients in stage I and 9 in stage II. Three endoscopic patterns were recognized: diffuse infiltration (9), ulceration (9) and polypoid lesions (13). There was no apparent correlation between the endoscopic appearance and the grading or subtype of the malignancy. Local recurrence did not occur once complete remission was obtained. The disease-free 5-year survival rate was 45%. Recognition of these endoscopic patterns may lead to earlier detection and, hopefully, improved survival. 相似文献
9.
10.
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