全文获取类型
收费全文 | 2758篇 |
免费 | 158篇 |
国内免费 | 26篇 |
专业分类
耳鼻咽喉 | 28篇 |
儿科学 | 90篇 |
妇产科学 | 45篇 |
基础医学 | 284篇 |
口腔科学 | 263篇 |
临床医学 | 244篇 |
内科学 | 582篇 |
皮肤病学 | 19篇 |
神经病学 | 154篇 |
特种医学 | 84篇 |
外科学 | 463篇 |
综合类 | 21篇 |
一般理论 | 1篇 |
预防医学 | 354篇 |
眼科学 | 14篇 |
药学 | 211篇 |
中国医学 | 1篇 |
肿瘤学 | 84篇 |
出版年
2023年 | 5篇 |
2022年 | 7篇 |
2021年 | 43篇 |
2020年 | 31篇 |
2019年 | 45篇 |
2018年 | 50篇 |
2017年 | 41篇 |
2016年 | 46篇 |
2015年 | 42篇 |
2014年 | 75篇 |
2013年 | 150篇 |
2012年 | 157篇 |
2011年 | 174篇 |
2010年 | 89篇 |
2009年 | 80篇 |
2008年 | 186篇 |
2007年 | 200篇 |
2006年 | 180篇 |
2005年 | 200篇 |
2004年 | 190篇 |
2003年 | 198篇 |
2002年 | 179篇 |
2001年 | 39篇 |
2000年 | 21篇 |
1999年 | 51篇 |
1998年 | 48篇 |
1997年 | 43篇 |
1996年 | 38篇 |
1995年 | 21篇 |
1994年 | 24篇 |
1993年 | 27篇 |
1992年 | 22篇 |
1991年 | 21篇 |
1990年 | 15篇 |
1989年 | 6篇 |
1988年 | 11篇 |
1987年 | 8篇 |
1986年 | 7篇 |
1985年 | 17篇 |
1984年 | 17篇 |
1983年 | 12篇 |
1982年 | 19篇 |
1981年 | 23篇 |
1980年 | 14篇 |
1979年 | 10篇 |
1978年 | 12篇 |
1976年 | 7篇 |
1975年 | 6篇 |
1974年 | 5篇 |
1966年 | 4篇 |
排序方式: 共有2942条查询结果,搜索用时 15 毫秒
51.
52.
53.
Nina Enberg Juhani Wolf Anja Ainamo Hannu Alho Pekka Heinälä Marianne Lenander-Lumikari 《Acta odontologica Scandinavica》2013,71(6):341-347
A total of 85 Finnish alcohol-dependent subjects and 53 controls were studied with panoramic radiography. The aim was to study the possible associations between prolonged alcohol consumption and dental health. The mean number of teeth, caries lesions, endodontic treatments, periapical lesions, marginal bone loss, and periodontal infrabony pockets was studied. The subjects met the diagnostic criteria of alcohol dependence as set out in DSM-IV and ICD-10. The control group comprised social drinking volunteers with an AUDIT score h 8. For the final results the subjects were divided into groups on the basis of sex and age. The social backgrounds of the subjects were similar, except for employment and smoking. The results show significantly fewer teeth and more caries in the alcoholic group. There was a tendency for the alcoholics <45 years of age to have more endodontically treated teeth than the controls, but no difference in the number of periapical lesions in endodontically treated teeth was found. Horizontal bone loss and the presence of calculus were more frequent in alcoholic men than in alcoholic women. Significantly more horizontal bone loss was observed in the group of alcoholic nonsmokers than in nonalcoholic nonsmokers. In the nonsmoking groups alcoholics had significantly more periodontal destruction than the nonsmoking controls. We conclude that radiological dental health among individuals dependent on alcohol is weakened by more caries, more horizontal bone loss, and more numerous vertical infrabony pockets than social drinkers. 相似文献
54.
55.
Various bone proteins and growth factors in specific concentrations are required for bone formation. If the body cannot produce sufficient quantities of these factors, bone trauma can be healed with an implant that includes the required factors in a carrier. This study was designed to evaluate various calcium salt candidates that can be used as carrier with reindeer bone protein extract to induce ectopic bone formation in the muscle pouch model of mouse. The bone protein extract was either impregnated into the disc form of carrier or mixed with carrier powder before implantation. The radiographic analysis indicated increased bone formation in all of the active groups containing the bone protein extract compared to the controls within 21 days follow-up. The highest bone formation was seen in the group with calcium sulfate with stearic acid where new bone and calcified cartilage were clearly visible. The greatest bone formation occurred in the groups that had bone protein extract readily available. This indicates that the bone forming factors in sufficient concentrations are required at the early stage of bone formation. The calcium sulfate with stearic acid was the most suitable and effective carrier for reindeer bone protein extract. 相似文献
56.
57.
58.
BACKGROUND. The activity of cyclooxygenase-2 (COX-2) is increased in inflammation and in several cancer types. We investigated the expression of COX-2, cyclooxygenase-1 (COX-1), nitric oxide synthase-2 (NOS-2) and nitric oxide synthase-3 (NOS-3) in normal proliferative and secretory human endometrium, and in endometrial adenocarcinoma. METHODS. Human endometrium was collected at hysterectomy. Seven samples were in proliferative and 11 samples in secretory stage. Twelve specimens from endometrial carcinoma were collected, as well. Immunohistochemistry was used to investigate the expression of COX-1, COX-2, NOS-2 and NOS-3. RESULTS. COX-2 immunostaining was detected in most specimens of normal proliferative glandular epithelium (86%) and of endometrial carcinomas (92%). COX-2 staining was often detected in cancer cells on the border areas of the tumour and on the areas of invasive growth. Staining for COX-2 was seen in proliferative glands usually only in the basal layer of the endometrium. NOS-2 was usually absent or negligible in proliferative endometrial glands and also in the cancer cells of endometrial adenocarcinomas. No staining for either COX-2 or NOS-2 was seen in specimens of secretory glandular epithelium. The expression of the constitutive COX-1 and NOS-3 was negligible or weak in the glandular epithelium of proliferative and secretory endometrium and in endometrial cancer cells. CONCLUSIONS. The expression of the inducible COX-2 but not of COX-1 is stimulated in the glandular epithelium of proliferative endometrium and in the cancer cells of human endometrial adenocarcinoma, in particular in those in the borders of carcinoma and spreading into lymphatic vessels. 相似文献
59.
S. Wayne Miles Janie Sheridan Bruce Russell Rob Kydd Amanda Wheeler Carina Walters Greg Gamble Peta Hardley Maree Jensen Kimmo Kuoppasalmi Pekka Tuomola Jaana Föhr Outi Kuikanmäki Helena Vorma Raimo Salokangas Antti Mikkonen Mika Kallio Jussi Kauhanen Vesa Kiviniemi Jari Tiihonen 《Addiction (Abingdon, England)》2013,108(7):1279-1286
60.
Lotta Saarnio MSc RN Anne‐Marie Boström RN PhD Petter Gustavsson PhD Joakim Öhlén PhD RN 《Scandinavian journal of caring sciences》2016,30(2):312-319
Maintaining the well‐being of older people who are approaching the end‐of‐life has been recognised as a significant aspect of well‐being in general. However, there are few studies that have explicitly focused on at‐homeness among older people. This study aims to illuminate meanings of at‐homeness among older people with advancing illnesses. Twenty men and women, aged 85 or older, with advancing illnesses and who lived in their own homes, in nursing homes or in short‐term nursing homes in three urban areas of Sweden were strategically sampled in the study. Data were generated in narrative interviews, and the analysis was based on a phenomenological hermeneutical method. After obtaining a naïve understanding and conducting structural analyses, two aspects of the phenomenon were revealed: at‐homeness as being oneself and at‐homeness as being connected. At‐homeness as being oneself meant being able to manage ordinary everyday life as well as being beneficial to one's life. At‐homeness as being connected meant being close to significant others, being in affirming friendships and being in safe dependency. Here, at‐homeness is seen as a twofold phenomenon, where being oneself and being connected are interrelated aspects. Being oneself and being connected are further interpreted by means of the concepts of agency and communion, which have been theorised as two main forces of the human being. 相似文献