全文获取类型
收费全文 | 228035篇 |
免费 | 4439篇 |
国内免费 | 242篇 |
专业分类
耳鼻咽喉 | 1664篇 |
儿科学 | 7888篇 |
妇产科学 | 3892篇 |
基础医学 | 23583篇 |
口腔科学 | 2911篇 |
临床医学 | 17339篇 |
内科学 | 41647篇 |
皮肤病学 | 1450篇 |
神经病学 | 21726篇 |
特种医学 | 11529篇 |
外国民族医学 | 6篇 |
外科学 | 36573篇 |
综合类 | 2920篇 |
现状与发展 | 1篇 |
一般理论 | 42篇 |
预防医学 | 22216篇 |
眼科学 | 4081篇 |
药学 | 12715篇 |
中国医学 | 703篇 |
肿瘤学 | 19830篇 |
出版年
2023年 | 257篇 |
2022年 | 534篇 |
2021年 | 1108篇 |
2020年 | 744篇 |
2019年 | 1012篇 |
2018年 | 22882篇 |
2017年 | 18109篇 |
2016年 | 20406篇 |
2015年 | 2125篇 |
2014年 | 2499篇 |
2013年 | 3067篇 |
2012年 | 10436篇 |
2011年 | 24512篇 |
2010年 | 20756篇 |
2009年 | 13327篇 |
2008年 | 22718篇 |
2007年 | 25008篇 |
2006年 | 3962篇 |
2005年 | 5476篇 |
2004年 | 6491篇 |
2003年 | 7303篇 |
2002年 | 5331篇 |
2001年 | 895篇 |
2000年 | 970篇 |
1999年 | 815篇 |
1998年 | 832篇 |
1997年 | 715篇 |
1996年 | 528篇 |
1995年 | 524篇 |
1994年 | 428篇 |
1993年 | 363篇 |
1992年 | 417篇 |
1991年 | 435篇 |
1990年 | 435篇 |
1989年 | 406篇 |
1988年 | 348篇 |
1987年 | 352篇 |
1986年 | 302篇 |
1985年 | 333篇 |
1984年 | 328篇 |
1983年 | 319篇 |
1982年 | 348篇 |
1981年 | 303篇 |
1980年 | 305篇 |
1979年 | 230篇 |
1978年 | 249篇 |
1977年 | 202篇 |
1976年 | 184篇 |
1975年 | 186篇 |
1974年 | 204篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
Diane C. Mitchell Author Vitae Frank R. LawrenceAuthor Vitae Terryl J. HartmanAuthor Vitae Julianne M. CurranAuthor Vitae 《Journal of the American Dietetic Association》2009,109(5):909-913
The US Department of Agriculture's MyPyramid guidelines introduced a near doubling of the dietary recommendations for vegetables. These recommendations target specific subgroups of vegetables, including dry beans and peas. Dry beans and peas provide an array of nutrients and phytochemicals that have been shown to have beneficial health effects, yet consumption levels in the United States are quite low. Few studies have examined the influence of legume consumption on nutrient intakes. Therefore, the purpose of this study was to assess nutrient and food group intakes of dry bean and pea consumers compared to nonconsumers. Dietary intake data from the 1999-2002 National Health and Nutrition Examination Survey for adults aged ≥19 years was used. Results show that on any given day only 7.9% of adults are consuming dry beans and peas; Mexican Americans or other Hispanics are more likely to be consumers than nonconsumers. Consuming approximately ½ c dry beans or peas resulted in higher intakes of fiber, protein, folate, zinc, iron, and magnesium with lower intakes of saturated fat and total fat. These data support the specific recommendation for dry beans and peas as part of the overall vegetable recommendation. Increased consumption of dry beans and peas—economical and nutrient-rich foods—could improve the diet quality of Americans. 相似文献
103.
104.
105.
106.
Introduction Choroid plexus cysts can lead to isolation of the lateral ventricles and distension of the third ventricle. We present an
ultrasonographic video documentation of an infant with variably shaped and localized choroid plexus cyst of the third ventricle.
Case report An infant had periods of increased intracranial pressure with changing dilatation of the first to third ventricle. Cerebral
ultrasonography of the not crying boy demonstrated a choroid plexus cyst limply hanging down from the roof of the third ventricle
to the beginning of the aqueduct of Sylvius. During crying, the cyst prolapsed from the third into left lateral ventricle
and was strangled by the foramen of Monro. Endoscopic cyst fenestration and third ventriculostomy continuously solved the
problem of intermittent hydrocephalus occlusus.
Conclusion Depending not only on localization and size but also on cyst form and cerebrospinal fluid pressure, a single choroid plexus
cyst can cause various obstructions of cerebrospinal fluid pathways. 相似文献
107.
Murat Hamit Aytar Fikret Doğulu Berker Cemil Ertan Ergün Gökhan Kurt Kemali Baykaner 《Child's nervous system》2007,23(6):719-721
Introduction Iniencephaly, a neural tube defect involving occiput and inion and combined with rachischisis of the cervical, thoracic spine,
and retroflexion position of the head is a very rare congenital abnormality of the fetus–newborn with a 0.1–10 of 10,000 prevalence.
This abnormality’s prognosis is thought to be dismal. This abnormality can be associated with other abnormalities such as
anencephaly, encephalocele, hydrocephalus, cyclopia, absence of the mandible, cleft lip and palate, cardiovascular disorders,
diaphragmatic hernia, renal abnormalities, overgrowth of the arms compared to the legs, and club food and gastrointestinal
atresia.
Discussion Most of the patients are dead born, and the others die in a few hours. There are only six previously documented long-term
survivors. In our case, our patient with iniencephalic signs and findings is still living. She is 2 years old now. We think
that this patient presents a mild form of iniencephaly. 相似文献
108.
Stefan Ockert Hardy Schumacher Dittmar Böckler Katrin Malcherek Jochen Hansmann Jens Allenberg 《Langenbeck's archives of surgery / Deutsche Gesellschaft fur Chirurgie》2007,392(6):725-730
Background and aims Since the introduction of endovascular aortic aneurysm repair (EVAR) for aortic aneurysms, the number of juxtarenal aortic
aneurysms (JRA) has been growing steadily due to selection bias (neck morphology for EVAR). This case-match study compares
the perioperative outcome and midterm results of suprarenally clamped JRA with infrarenal aortic aneurysms (AAA).
Methods From 1997 to 2004, patients who received open surgery with suprarenal clamping for JRA were included in the study and compared
to matched patients with infrarenal clamping (AAA). Measurements analyzed were the in-hospital mortality and morbidity. Midterm
results were obtained through clinical investigation and magnetic resonance angiography imaging.
Results Thirty-five patients (mean age, 68.4 years; 30 male and 5 female) received suprarenal cross-clamping for JRA. The overall
in-hospital mortality for JRA and for the controls (AAA) with elective aortic repair was 4.5% (6.1% JRA; 3% AAA, p = 0.058). The morbidity of JRA was elevated according to the rate of pulmonary complications (p = 0.021) and the need for re-operation (p = 0.019). The mean follow-up time was 2.3 years (range, 8–96 months). At follow-up, 28 patients (80%) from the JRA group
and 29 patients from the AAA group (82.9%) were alive.
Conclusion Open aortic surgery for JRA with the need for suprarenal cross-clamping shows a slightly elevated in-hospital mortality rate
without statistical significance and equal midterm mortality results in comparison with infrarenally clamped aortic aneurysms. 相似文献
109.
Stefano Di Domenico Giulio Bovio Maximiliano Gelli Ferruccio Ravazzoni Enzo Andorno Damiano Cottalasso Umberto Valente 《BMC surgery》2007,7(1):18
Background
Liver transplantation in presence of diffuse portal vein thrombosis is possible by using caval blood as portal inflow, through cavo-portal transposition. However, clinical results are heterogeneous and experimental studies are needed, but similar hemodynamic conditions are difficult to obtain, especially in small animals. Herein we describe a new simple model of cavo-portal transposition in rat. 相似文献110.