全文获取类型
收费全文 | 340384篇 |
免费 | 8377篇 |
国内免费 | 594篇 |
专业分类
耳鼻咽喉 | 3875篇 |
儿科学 | 11425篇 |
妇产科学 | 6808篇 |
基础医学 | 38782篇 |
口腔科学 | 7469篇 |
临床医学 | 22880篇 |
内科学 | 71533篇 |
皮肤病学 | 5923篇 |
神经病学 | 29970篇 |
特种医学 | 12688篇 |
外国民族医学 | 2篇 |
外科学 | 49115篇 |
综合类 | 3296篇 |
现状与发展 | 1篇 |
一般理论 | 46篇 |
预防医学 | 33758篇 |
眼科学 | 6308篇 |
药学 | 20784篇 |
中国医学 | 1531篇 |
肿瘤学 | 23161篇 |
出版年
2023年 | 1119篇 |
2022年 | 1998篇 |
2021年 | 4796篇 |
2020年 | 2348篇 |
2019年 | 4429篇 |
2018年 | 27432篇 |
2017年 | 20453篇 |
2016年 | 22473篇 |
2015年 | 4867篇 |
2014年 | 6128篇 |
2013年 | 8406篇 |
2012年 | 18766篇 |
2011年 | 33228篇 |
2010年 | 25153篇 |
2009年 | 16635篇 |
2008年 | 28903篇 |
2007年 | 31611篇 |
2006年 | 10184篇 |
2005年 | 11746篇 |
2004年 | 11861篇 |
2003年 | 12212篇 |
2002年 | 9790篇 |
2001年 | 4747篇 |
2000年 | 5425篇 |
1999年 | 4160篇 |
1998年 | 1171篇 |
1997年 | 964篇 |
1996年 | 718篇 |
1995年 | 684篇 |
1994年 | 565篇 |
1993年 | 456篇 |
1992年 | 1591篇 |
1991年 | 1396篇 |
1990年 | 1289篇 |
1989年 | 1035篇 |
1988年 | 888篇 |
1987年 | 809篇 |
1986年 | 804篇 |
1985年 | 710篇 |
1984年 | 517篇 |
1983年 | 427篇 |
1979年 | 461篇 |
1978年 | 333篇 |
1974年 | 424篇 |
1973年 | 398篇 |
1972年 | 343篇 |
1971年 | 367篇 |
1970年 | 352篇 |
1969年 | 381篇 |
1968年 | 326篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
Chad G. Ball Andrew W. Kirkpatrick Matthew Smith Robert H. Mulloy Leonard Tse Ian B. Anderson 《European journal of trauma and emergency surgery》2007,33(5):550-552
Abstract We report a case of SMV injury in a critically ill patient. The patient was a 19-year-old woman involved in a motor vehicle
collision. Her injuries included grade II splenic and renal lacerations, devascularized and lacerated right and transverse
colon, a transected transverse mesocolon, a massive shear injury of her abdominal wall, and two partial SMV transections.
At initial damage control laparotomy, the SMV was ligated, the devascularized bowel resected and a temporary abdominal closure
applied. At re-operation, a mesocaval shunt using saphenous vein was employed. The shunt failed and the patient required a
saphenous vein jump graft. Although visceral vascular injuries are rare, ligation of the SMV in a damage control situation
is acceptable. This case study is the first to discuss appropriate treatment when interruption to a patient's collateral visceral
venous drainage limits the surgeon’s ability to ligate. In these situations, bypass shunts may be successful. 相似文献
93.
Prevalence of Artemisia species pollinosis in western Poland: impact of climate change on aerobiological trends, 1995-2004. 总被引:2,自引:0,他引:2
A Stach H García-Mozo J C Prieto-Baena M Czarnecka-Operacz D Jenerowicz W Silny C Galán 《Journal of investigational allergology & clinical immunology》2007,17(1):39-47
BACKGROUND: Artemisia species pollen represents a major cause of allergy in Central Europe. Variations in the pollen season, the influence of climate variables and the prevalence of pollinosis to it were analyzed in Poznan, in western Poland between 1995 and 2004. METHODS: A Hirst volumetric spore trap was used for atmospheric sampling. Pollination date trend analysis and Spearman correlation tests were performed. Skin prick tests (SPT) and allergen specific immunoglobulin (lg)E antibody measurements were performed in 676 and 524 patients, respectively. RESULTS: The Artemisia species pollen season grew longer due to a clear advance in the starting day and only a slightly earlier end point; the peak day also came slightly earlier. Rainfall in the first fortnight of July highly influenced pollen season severity. Temperature was directly correlated with daily Artemisia species pollen levels; relative humidity was inversely correlated. Twelve percent of patients had a positive SPT reaction to Artemisia species. Their symptoms were rhinitis and conjunctivitis (15%), atopic dermatitis (15%), chronic urticaria (14.3%), bronchial asthma (2.4%), and facial and disseminated dermatitis (1.3%). Elevated specific IgE concentrations were detected in the sera of 10.1% of patients. CONCLUSIONS: Artemisia species pollen is an important cause of pollinosis in western Poland. Pollen season intensity is highly influenced by rainfall in the previous weeks. Trends towards earlier season starts and longer duration, possibly caused by climate change, may have an impact on the allergic population. 相似文献
94.
95.
C Martín-García J Carnés R Blanco J C Martínez-Alonso A Callejo-Melgosa A Frades T Colino 《Journal of investigational allergology & clinical immunology》2007,17(4):271-273
Many types of seafood require cooking before ingestion and it has been demonstrated that this cooking process may affect the antigenicity and allergenicity of the food. We describe a case of anaphylaxis caused by selective sensitization to razor shell, a mollusc. In vivo and in vitro studies confirmed sensitization to boiled razor shell. Analysis of the nature of the allergen yielded results that were consistent with the findings of other authors and suggested that allergens involved in seafood allergy are commonly high molecular weight proteins that, in most cases, are heat stable. 相似文献
96.
Henry Cisneros 《AIDS and behavior》2007,11(2):7-8
For persons battling HIV/AIDS a stable place to live may decide the length and quality of life itself. It is nearly impossible for a person on the streets to engage in a needed continuous AIDS treatment regimen when the very basic question of where that person will rest his or her head when darkness comes in just a few hours is unresolved. When danger lurks on the streets, when cold numbs the limbs, when tiredness overwhelms the mind, when fear breaks the spirit, a place to call home would make all the difference. 相似文献
97.
98.
99.
Background
Reports on childhood cancer survivors estimated cumulative probability of developing secondary neoplasms vary from 3,3% to 25% at 25 years from diagnosis, and the risk of developing another cancer to several times greater than in the general population. 相似文献100.