全文获取类型
收费全文 | 3414950篇 |
免费 | 241545篇 |
国内免费 | 8815篇 |
专业分类
耳鼻咽喉 | 47391篇 |
儿科学 | 113226篇 |
妇产科学 | 95773篇 |
基础医学 | 483180篇 |
口腔科学 | 95934篇 |
临床医学 | 307472篇 |
内科学 | 665826篇 |
皮肤病学 | 80000篇 |
神经病学 | 277455篇 |
特种医学 | 132364篇 |
外国民族医学 | 1047篇 |
外科学 | 514544篇 |
综合类 | 69582篇 |
现状与发展 | 6篇 |
一般理论 | 1216篇 |
预防医学 | 260538篇 |
眼科学 | 77702篇 |
药学 | 251895篇 |
9篇 | |
中国医学 | 6846篇 |
肿瘤学 | 183304篇 |
出版年
2018年 | 36962篇 |
2017年 | 28312篇 |
2016年 | 32821篇 |
2015年 | 36772篇 |
2014年 | 50519篇 |
2013年 | 76603篇 |
2012年 | 101897篇 |
2011年 | 108419篇 |
2010年 | 65091篇 |
2009年 | 61847篇 |
2008年 | 102055篇 |
2007年 | 108909篇 |
2006年 | 110663篇 |
2005年 | 106476篇 |
2004年 | 102659篇 |
2003年 | 99463篇 |
2002年 | 96487篇 |
2001年 | 158906篇 |
2000年 | 163068篇 |
1999年 | 137587篇 |
1998年 | 40008篇 |
1997年 | 35498篇 |
1996年 | 35687篇 |
1995年 | 34327篇 |
1994年 | 31772篇 |
1993年 | 29824篇 |
1992年 | 108152篇 |
1991年 | 104793篇 |
1990年 | 102038篇 |
1989年 | 98918篇 |
1988年 | 91080篇 |
1987年 | 89436篇 |
1986年 | 84370篇 |
1985年 | 80685篇 |
1984年 | 60022篇 |
1983年 | 51519篇 |
1982年 | 30742篇 |
1981年 | 27309篇 |
1979年 | 54386篇 |
1978年 | 38383篇 |
1977年 | 32932篇 |
1976年 | 30699篇 |
1975年 | 33102篇 |
1974年 | 38952篇 |
1973年 | 37205篇 |
1972年 | 35229篇 |
1971年 | 32624篇 |
1970年 | 30445篇 |
1969年 | 29233篇 |
1968年 | 27115篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
ngela P. de Mattos Tereza C.M. Ribeiro Patrícia S.A. Mendes Sandra S. Valois Carlos M.C. Mendes Hugo C. Ribeiro Jr 《Nutrition Research》2009,29(7):462-469
Although previous studies have shown successful treatment of persistent diarrhea (PD) with the use of yogurt-based diets, some recent ones speculate the need of special formulas for the nutritional management of PD complicated cases. In the present study, we tested the hypothesis that the consumption of 3 lactose-free diets, with different degrees of complexity, is associated with lower stool output and shorter duration of diarrhea when compared with the use of a yogurt-based one on the nutritional management of PD. A total of 154 male infants, aged between 1 and 30 months, with PD and with or without dehydration, were randomly assigned to 1 of 4 treatment groups. Throughout the study, the patients were placed in a metabolic unit; their body weights and intakes of oral rehydration solution, water, and formula diets, in addition to outputs of stool, urine, and vomit, were measured and recorded at 24-hour intervals. Four different diets were used in this study: diet 1, yogurt-based formula; diet 2, soy-based formula; diet 3, hydrolyzed protein-based formula; and diet 4, amino acid–based formula. Throughout the study, only these formula diets were fed to the children. The data showed that children fed the yogurt-based diet (diet 1) or the amino acid–based diet (diet 4) had a significant reduction in stool output and in the duration of diarrhea. The use of an inexpensive and worldwide-available yogurt-based diet is recommended as the first choice for the nutritional management of mild to moderate PD. For the few complicated PD cases, when available, a more complex amino acid–based diet should be reserved for the nutritional management of these unresponsive and severe presentations. Soy-based or casein-based diets do not offer any specific advantage or benefits and do not seem to have a place in the management of PD. 相似文献
992.
993.
994.
995.
996.
997.
998.
Background contextLarge, prominent osteophytes along the anterior aspect of the cervical spine have been reported as a cause of dysphagia. Improvement of swallowing after surgical resection has been reported in a few case reports with short-term follow-up. The current report describes outcomes of a series of five patients with surgical treatment for this rare disorder, with a long-term follow-up.PurposeTo study the clinical and radiographic outcomes of a case series of patients surgically treated for dysphagia secondary to cervical diffuse idiopathic skeletal hyperostosis (DISH).Study designRetrospective review of a case series.Patient sampleFive cases from a University Hospital.Outcome measuresClinical and imagenological follow-up.MethodsThe records of five patients with dysphagia who had undergone anterior surgical resection of prominent osteophytes secondary to DISH were reviewed. Extrinsic esophageal compression secondary to anterior cervical osteophytes was radiographically confirmed via preoperative barium esophagogram swallowing study. All patients underwent anterior cervical osteophytes resection without fusion. Postoperatively, patients were followed-up clinically and radiographically with routine lateral cervical radiographs.ResultsPreoperative esophagogram showed that the esophageal obstruction was present at one level in three cases and two levels in two cases. The C3–C4 level was involved in three cases, C4–C5 in three cases, and C5–C6 in one case. There were no postoperative complications, including recurrent laryngeal nerve palsy, wound infection, or hematomas. All patients had resolution of dyphagia soon after surgery (within 2 weeks). Postoperative radiographs demonstrated complete removal of osteophytes. At final follow-up, ranging from 1 to 9 years (average 59.8 months, median 53 months), no patients reported recurrence of dysphagia. Final radiographic examination demonstrated minimal regrowth of the osteophytes.ConclusionsAlthough rarely indicated, surgical resection of anterior cervical osteophytes from DISH causing dyphagia produces good clinical and radiographical outcomes. After thorough evaluation to rule out other intrinsic or extrinsic causes of swallowing difficulty, surgical treatment of this uncommon condition might be considered. 相似文献
999.
1000.