全文获取类型
收费全文 | 3298412篇 |
免费 | 254720篇 |
国内免费 | 5989篇 |
专业分类
耳鼻咽喉 | 47409篇 |
儿科学 | 105340篇 |
妇产科学 | 88403篇 |
基础医学 | 467164篇 |
口腔科学 | 93666篇 |
临床医学 | 299171篇 |
内科学 | 644134篇 |
皮肤病学 | 69608篇 |
神经病学 | 273719篇 |
特种医学 | 129406篇 |
外国民族医学 | 1334篇 |
外科学 | 494036篇 |
综合类 | 74763篇 |
现状与发展 | 2篇 |
一般理论 | 1279篇 |
预防医学 | 266186篇 |
眼科学 | 76355篇 |
药学 | 246405篇 |
6篇 | |
中国医学 | 6434篇 |
肿瘤学 | 174301篇 |
出版年
2018年 | 37528篇 |
2017年 | 28265篇 |
2016年 | 30818篇 |
2015年 | 34784篇 |
2014年 | 48407篇 |
2013年 | 73928篇 |
2012年 | 103050篇 |
2011年 | 108504篇 |
2010年 | 62845篇 |
2009年 | 59068篇 |
2008年 | 101805篇 |
2007年 | 108638篇 |
2006年 | 108399篇 |
2005年 | 105490篇 |
2004年 | 101752篇 |
2003年 | 98031篇 |
2002年 | 95886篇 |
2001年 | 147800篇 |
2000年 | 152990篇 |
1999年 | 129783篇 |
1998年 | 37563篇 |
1997年 | 34009篇 |
1996年 | 33817篇 |
1995年 | 32617篇 |
1994年 | 30554篇 |
1993年 | 28522篇 |
1992年 | 104121篇 |
1991年 | 101165篇 |
1990年 | 97700篇 |
1989年 | 94032篇 |
1988年 | 87134篇 |
1987年 | 85813篇 |
1986年 | 80989篇 |
1985年 | 77486篇 |
1984年 | 58779篇 |
1983年 | 50038篇 |
1982年 | 30141篇 |
1981年 | 27014篇 |
1979年 | 54738篇 |
1978年 | 38338篇 |
1977年 | 32484篇 |
1976年 | 30477篇 |
1975年 | 32459篇 |
1974年 | 39561篇 |
1973年 | 37737篇 |
1972年 | 35180篇 |
1971年 | 32361篇 |
1970年 | 30653篇 |
1969年 | 28412篇 |
1968年 | 25893篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
With the increased use of indwelling central venous catheters, increasing numbers of cases of Rhodotorula fungemia have been observed in patients with neoplasia and neutropenia. In most patients with catheter-related Rhodotorula fungemia, the condition has been treated with broadspectrum antibiotics. We report two cases of central venous catheter-related
Rhodotorula rubra fungemia that occurred in patients with acute myeloblastic leukemia. Both patients were in a state of neutropenia. One patient
was treated with amphotericin B and his central venous catheter was removed, but he died of Klebsiella pneumoniae bacteremia. The other patient was treated with amphotericin B and discharged, with a central venous catheter, after recovery
from neutropenia. Although the management of catheter-related Rhodotorula fungemia infections remains controversial, resolution of the underlying disease is more important than catheter removal for
recovery from Rhodotorula rubra fungemia.
Received: August 22, 2001 / Accepted: October 8, 2001 相似文献
992.
David C. Cone MD Susan M. Nedza MD MBA James J. Augustine MD Steven J. Davidson MD MBA 《Academic emergency medicine》2002,9(11):1085-1090
This paper reports the proceedings of the discussion panel assigned to look at clinical aspects of quality in emergency medicine. One of the seven stated objectives of the Academic Emergency Medicine consensus conference on quality in emergency medicine was to educate emergency physicians regarding quality measures and quality improvement as essential aspects of the practice of emergency medicine. Another topic of interest was a discussion of the value of information technology in facilitating quality care in the clinical practice of emergency medicine. It is important to note that this is not intended to be a comprehensive review of this extensive topic, but instead is designed to report the discussion that occurred at this session of the consensus conference. 相似文献
993.
994.
995.
Tc-99m HMPAO was used to evaluate cerebral perfusion in a patient with tuberous sclerosis. The SPECT images demonstrated reduced HMPAO uptake in regions corresponding with MRI-confirmed locations of cortical tubers. These results indicate that the lesions are characterized by vascular perfusion deficits and support the hypothesis that cortical tubers result from developmental abnormalities of the embryonic central nervous system. 相似文献
996.
Esophageal pH monitoring is the accepted standard for the investigation of gastroesophageal reflux (GER) in adults. A postal questionnaire was sent to 912 United Kingdom paediatric physicians & surgeons. Five hundred forty-seven (61%) replied, with 124 (22.7%) currently using the technique, mostly in conjunction with barium swallow and/or esophagoscopy. The use of pH monitoring to quantify GER was also accepted in principal as being the best determinant of reflux by a further 186 (34%), but as yet was unavailable in their hospitals. Pediatricians were also questioned as to their management of children with GER. The majority were treated medically with a variety of antireflux medication, with only 237 (42%) referring cases for surgery. 相似文献
997.
998.
999.
P M Doraiswamy K R Krishnan O B Boyko M M Husain G S Figiel V J Palese P R Escalona S A Shah W M McDonald W J Rockwell 《Progress in neuro-psychopharmacology & biological psychiatry》1991,15(3):351-356
1. The frequent occurrence of hypothalamo-pituitary dysfunction in patients with eating disorders as well as prior reports that nutritional and endocrine status influence pituitary morphology, led us to hypothesize that pituitary size and shape may be altered in patients with eating disorders. 2. Magnetic resonance imaging (MRI) does not use ionizing radiation and is currently one of the most feasible modalities available to study the pituitary gland in vivo. Using MRI, we have previously reported in a preliminary study that female patients with eating disorders had significantly smaller pituitary glands than controls. In addition MRI excluded any pituitary mass lesions. 3. In this report, we confirm our previous MRI findings and provide further evidence of pituitary abnormalities in an expanded sample of eating disorder patients. Preliminary data on pituitary volume estimates from MRI scans are provided for a subset of patients and controls. 相似文献
1000.
J R Glowa J D Bacher M Herkenham P W Gold 《Progress in neuro-psychopharmacology & biological psychiatry》1991,15(3):379-391
1. Rhesus monkeys were equipped with a novel intracerebroventricular (i.c.v.) cannula system and trained to respond under operant schedules of food presentation or termination of stimuli associated with the delivery of shock (escape). 2. CRH decreased food-maintained behavior in a dose-related manner over the range of (0.3-10 micrograms/kg) but did not affect escape responding, demonstrating a selective effect on food-maintained responding. 3. This selective effect was related to the tendency for responding to stop after delivery of a food pellet when higher doses of CRH were given, consistent with the notion that a conditioned aversion to food was established in the presence of CRH. 4. This may suggest that in hyperaroused clinical states such as depression and anorexia nervosa, focus is shifted away from appetitive tasks as a result of increased levels of CRH. 相似文献