全文获取类型
收费全文 | 931869篇 |
免费 | 66168篇 |
国内免费 | 1341篇 |
专业分类
耳鼻咽喉 | 12957篇 |
儿科学 | 24358篇 |
妇产科学 | 23232篇 |
基础医学 | 132876篇 |
口腔科学 | 28246篇 |
临床医学 | 80525篇 |
内科学 | 183218篇 |
皮肤病学 | 19236篇 |
神经病学 | 72165篇 |
特种医学 | 36797篇 |
外国民族医学 | 79篇 |
外科学 | 152062篇 |
综合类 | 18042篇 |
现状与发展 | 1篇 |
一般理论 | 234篇 |
预防医学 | 61736篇 |
眼科学 | 21307篇 |
药学 | 72520篇 |
3篇 | |
中国医学 | 2162篇 |
肿瘤学 | 57622篇 |
出版年
2018年 | 8959篇 |
2017年 | 7025篇 |
2016年 | 7758篇 |
2015年 | 8856篇 |
2014年 | 11980篇 |
2013年 | 17490篇 |
2012年 | 24073篇 |
2011年 | 25025篇 |
2010年 | 14797篇 |
2009年 | 14261篇 |
2008年 | 24592篇 |
2007年 | 25679篇 |
2006年 | 26470篇 |
2005年 | 25416篇 |
2004年 | 24551篇 |
2003年 | 23595篇 |
2002年 | 23142篇 |
2001年 | 54724篇 |
2000年 | 56541篇 |
1999年 | 46947篇 |
1998年 | 10730篇 |
1997年 | 9465篇 |
1996年 | 9593篇 |
1995年 | 8929篇 |
1994年 | 8280篇 |
1993年 | 7595篇 |
1992年 | 35489篇 |
1991年 | 33912篇 |
1990年 | 32734篇 |
1989年 | 31869篇 |
1988年 | 28991篇 |
1987年 | 28249篇 |
1986年 | 26288篇 |
1985年 | 25144篇 |
1984年 | 17832篇 |
1983年 | 15141篇 |
1982年 | 7795篇 |
1981年 | 6771篇 |
1979年 | 15781篇 |
1978年 | 10598篇 |
1977年 | 9052篇 |
1976年 | 7871篇 |
1975年 | 8628篇 |
1974年 | 10466篇 |
1973年 | 9859篇 |
1972年 | 9357篇 |
1971年 | 8852篇 |
1970年 | 8426篇 |
1969年 | 7923篇 |
1968年 | 7200篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
83.
84.
85.
86.
Darren R. Feldman MD Yasser Ged MBBS Chung-Han Lee PhD Andrea Knezevic MS Ana M. Molina MD Ying-Bei Chen PhD Joshua Chaim DO Devyn T. Coskey MS Samuel Murray MS Satish K. Tickoo MD Victor E. Reuter MD Sujata Patil PhD Han Xiao MD Jahan Aghalar MD Arlyn J. Apollo MD Maria I. Carlo MD Robert J. Motzer MD Martin H. Voss MD 《Cancer》2020,126(24):5247-5255
87.
Ming-Yeh Yang Ching-Yuan Huang Tina H.T. Chiu Kai-Chih Chang Ming-Nan Lin Liang-Yü Chen Anren Hu 《Yao wu shi pin fen xi = Journal of food and drug analysis.》2019,27(2):494-501
Vitamin D is responsible for multiple metabolic functions in humans. Rickets are the most common disease caused by vitamin D deficiency. It is caused by poor calcium intake resulting in poor serum-ionized calcium. The purpose of this study is to develop a rapid, sensitive, and feasible method to determine the 25-hydroxy-vitamin D3 (25(OH)D3) levels in blood samples for clinical assessment. In this study, gas chromatography coupled mass spectrometry with trimethylsilyl derivatization (TMS-GC-MS) is the most suitable protocol for quantitative analyses of 25(OH)D3. Performance of method was evaluated and compared with liquid chromatography and immunoassay. Method validation has been carried out with plasma specimens. The limit of quantitation of TMS-GC-MS method is 1.5 ppb with good linear correlation. Furthermore, the dietary intake and nutritional status of vegetarian and non-vegetarians in Taiwan were assessed by our validated method. As a result, this vitamin D nutrition survey demonstrates that most Taiwanese people have insufficient vitamin D. Due to dietary habits; the male vegans may have the highest risk of vitamin D deficiency. 相似文献
88.
M. Masson Regnault J. Castañeda-Sanabria M.H.T. Diep Tran M. Beylot-Barry H. Bachelez N. Beneton O. Chosidow A. Dupuy P. Joly D. Jullien E. Mahé M.-A. Richard M. Viguier F. Tubach E. Sbidian C. Paul The PsoBioTeq Study Group 《Journal of the European Academy of Dermatology and Venereology》2020,34(2):293-300
89.
Philippe A. Eigenmann Motohiro Ebisawa Matthew Greenhawt Jonathan O’B Hourihane Tamara T. Perry Benjamin C. Remington Robert A. Wood 《Pediatric allergy and immunology》2021,32(4):658-666
Risk is a concept inherent in every medical procedure. It can be defined as the probability of an adverse event in a defined population over a specified period of time. In the frame of food allergy management, it might be related to a diagnostic procedure, a treatment, or the consumption of foods. The risk of an adverse event can also be augmented by individual factors. This rostrum article discusses various aspects faced by children with food allergies in the light of risk, and their practical implications. Identifying personal risks for severe reaction, such as unstable asthma, and correcting them whenever possible also contribute to a reduction of the risk inherent to food allergy. Among the facets discussed, oral food challenges (OFC) are the most common diagnostic procedures implying an inherent risk. The risk of OFCs can be minimized by correct indication and timing of the test, a safe setting, as well as by ensuring that the patient is otherwise well without potential stressor potentially increasing the risk of a more severe reaction. Oral immunotherapy (OIT) has been studied as a potential treatment for increasing the threshold dose for reaction, and thus reducing the risk of accidental reaction. Nevertheless, the procedure is not devoid of risk as the patients may and do often react during the course of the procedure. Ingestion of trace amounts in processed foods, mainly in community settings such as restaurants, schools, or day care, represents a potential risk of reactions, although for a minority of patients. Precautionary allergen labeling (PAL) is a widespread strategy to reduce the potential risk of reactions due to traces. However, PAL is currently inefficient due to inconsistent labeling, also not indicating a clear maximum amount possibly present in the manufactured food. Finally, cost-effectiveness needs to be considered in risk management, as many risk reduction procedures are clearly not cost-effective. 相似文献
90.
D. Sforza G. Iaria L. Petagna A. Parente A. Anselmo F. Sergi S. Marzio F. Corrado S. Telli T.M. Manzia G. Tisone 《Transplantation proceedings》2019,51(1):140-142