全文获取类型
收费全文 | 250341篇 |
免费 | 16873篇 |
国内免费 | 1079篇 |
专业分类
耳鼻咽喉 | 2668篇 |
儿科学 | 6369篇 |
妇产科学 | 5031篇 |
基础医学 | 32933篇 |
口腔科学 | 5504篇 |
临床医学 | 24291篇 |
内科学 | 53964篇 |
皮肤病学 | 3916篇 |
神经病学 | 23270篇 |
特种医学 | 9396篇 |
外国民族医学 | 9篇 |
外科学 | 38560篇 |
综合类 | 3300篇 |
现状与发展 | 3篇 |
一般理论 | 214篇 |
预防医学 | 18824篇 |
眼科学 | 5794篇 |
药学 | 16730篇 |
2篇 | |
中国医学 | 382篇 |
肿瘤学 | 17133篇 |
出版年
2023年 | 1206篇 |
2022年 | 1924篇 |
2021年 | 4405篇 |
2020年 | 2793篇 |
2019年 | 4351篇 |
2018年 | 5269篇 |
2017年 | 4013篇 |
2016年 | 4548篇 |
2015年 | 5257篇 |
2014年 | 7650篇 |
2013年 | 10978篇 |
2012年 | 16441篇 |
2011年 | 17321篇 |
2010年 | 9825篇 |
2009年 | 9246篇 |
2008年 | 16112篇 |
2007年 | 17452篇 |
2006年 | 16616篇 |
2005年 | 16980篇 |
2004年 | 16241篇 |
2003年 | 15386篇 |
2002年 | 14761篇 |
2001年 | 2301篇 |
2000年 | 1716篇 |
1999年 | 2378篇 |
1998年 | 3356篇 |
1997年 | 2757篇 |
1996年 | 2358篇 |
1995年 | 2238篇 |
1994年 | 1976篇 |
1993年 | 1834篇 |
1992年 | 1372篇 |
1991年 | 1348篇 |
1990年 | 1093篇 |
1989年 | 1095篇 |
1988年 | 1019篇 |
1987年 | 1069篇 |
1986年 | 992篇 |
1985年 | 1065篇 |
1984年 | 1365篇 |
1983年 | 1333篇 |
1982年 | 1743篇 |
1981年 | 1609篇 |
1980年 | 1459篇 |
1979年 | 833篇 |
1978年 | 912篇 |
1977年 | 979篇 |
1976年 | 830篇 |
1975年 | 730篇 |
1974年 | 604篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
41.
42.
Timothy J Halligan Nathan G Russell William J Dunn Steven J Caldroney Timothy B Skelton 《Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics》2005,100(6):688-692
Scurvy is a nondiscriminatory disease process resulting from a nutritional deficiency of ascorbic acid (vitamin C). The severe vitamin deficiency produces a breakdown in the cellular structure of the body. This case report describes a middle-age woman with a history of edema, bruising of the lower extremities, anemia, and severe periodontal disease. Her presentation and medical history are classic for the signs of scurvy. Scurvy is now only uncommonly seen in developed countries, but there are still vulnerable populations whose nutritional status can lead to scurvy. The aim of this report is to help the clinician identify and treat scurvy, a disease that was once feared for its high mortality but is now easily treatable, even in cases that have progressed to multiple organ dysfunction and failure. 相似文献
43.
Although lesions of the pterygopalatine space are uncommon, there are instances in which this relatively inaccessible region must be entered for biopsy or excision of masses. Traditional open approaches to the pterygopalatine space, involving external or intraoral incisions, provide limited visualization and carry associated morbidities. The evolution and advancement of endoscopic sinus surgical technique in recent years has led to its application to anatomic areas outside the strict limits of the sinonasal cavities. Such minimally invasive approaches are safe, effective, and spare unnecessary discomfort to the patient. This article describes the authors' method for performing an endoscopic approach to the pterygopalatine space. 相似文献
44.
Denis Nissim-Sabat William H. Farr Kathleen McCune Melanie Stith 《Community mental health journal》1986,22(2):160-165
This study represents the first of a two-stage project. The first phase of the study examined the funding sources for the 40 Community Services Boards in Virginia. Data provided from the Department of Mental Health and Mental Retardation in Virginia examined fee collections which are comprised of direct client, commercial insurance, Medicaid and Medicare. An analysis of quarterly reports from 1982 to 1984 revealed that Medicaid collections have decreased significantly, while commercial insurance reimbursements have increased significantly. These results, although limited to data from Virginia, point to the need to examine if these shifts are occurring nation-wide, and to determine if the shift toward commercial insurance is impacting upon the delivery of services in Community Mental Health Centers. 相似文献
45.
Williamson Kathleen A.; Hever Ann M.; Rainger Joe; Rogers R. Curtis; Magee Alex; Fiedler Zdenek; Keng Wee Teik; Sharkey Freddie H.; McGill Niolette; Hill Clare J.; Schneider Adele; Messina Mario; Turnpenny Peter D.; Fantes Judy A.; van Heyningen Veronica; FitzPatrick David R. 《Human molecular genetics》2006,15(12):2030
Table 1 相似文献
46.
47.
48.
Milos Jesenak MD PhD Peter Banovcin MD PhD Zuzana Rennerova MD PhD Lubica Jakusova MD PhD Zuzana Havlicekova MD PhD Vladimir Pohanka MD PhD MPH FCCP Maria Pia Villa MD PhD Roberto Ronchetti MD PhD 《International journal of dermatology》2009,48(9):941-946
Background The atopy patch test (APT) is no longer an experimental method; it is increasingly being used as a standard diagnostic tool for the characterization of patients with aeroallergen- and food-triggered disorders. Some technical aspects of this test still remain to be answered. We aimed to study the reproducibility of this test over time in the general child population.
Methods In a general population of 118 children, we investigated the reproducibility of duplicate APTs with four food allergens in their native form, which were repeated at set intervals from the first test: 7 days (group 1), 14 days (group 2), and 21 days (group 3).
Results We observed very poor reproducibility on both sides of the back in all three studied subgroups. The reproducibility rates and Cohen's κ values did not improve when we did not consider the side of the back. There were no differences in the prevalence of atopy between the subjects with reproducible and nonreproducible APT results. All three groups studied showed no difference in the prevalence rates of atopy. There was no relationship between APT and skin prick test positivity for the same allergen. Questionnaire-derived data about previous food-related reactions did not help in the evaluation of the doubtful nonreproducible APT results with food allergens.
Conclusions Our results show that the reproducibility of food APTs is poor and unsatisfactory over time, and there is an urgent need for the development of optimal, stable, and good-quality APT testing substances. 相似文献
Methods In a general population of 118 children, we investigated the reproducibility of duplicate APTs with four food allergens in their native form, which were repeated at set intervals from the first test: 7 days (group 1), 14 days (group 2), and 21 days (group 3).
Results We observed very poor reproducibility on both sides of the back in all three studied subgroups. The reproducibility rates and Cohen's κ values did not improve when we did not consider the side of the back. There were no differences in the prevalence of atopy between the subjects with reproducible and nonreproducible APT results. All three groups studied showed no difference in the prevalence rates of atopy. There was no relationship between APT and skin prick test positivity for the same allergen. Questionnaire-derived data about previous food-related reactions did not help in the evaluation of the doubtful nonreproducible APT results with food allergens.
Conclusions Our results show that the reproducibility of food APTs is poor and unsatisfactory over time, and there is an urgent need for the development of optimal, stable, and good-quality APT testing substances. 相似文献
49.
Anna Krygowska-Wajs William P. Cheshire Zbigniew K. Wszolek Alicja Hubalewska-Dydejczyk Barbara Jasinska-Myga Matthew J. Farrer Marek Moskala Anna Sowa-Staszczak 《Parkinsonism & related disorders》2009,15(9):692-696
ObjectiveTo assess for the presence of gastric dysmotility in familial and sporadic Parkinson disease (PD).Methods10 subjects with familial Parkinson disease (fPD), 35 subjects with sporadic Parkinson disease (sPD), and 15 controls, all from academic tertiary care movement disorders centers, were studied. fPD was defined as the presence of at least 2 affected individuals within 2–3 consecutive generations in a family. Molecular genetic analysis has not revealed, thus far, any known genomic abnormality in these families. Gastric emptying was assessed by dynamic abdominal scintigraphy over 92 min following ingestion of a solid meal containing 99mTc-labeled colloid of 40 MBq activity. The main outcome measures were gastric emptying half-time and radiotracer activity over the gastric area at 46 and at 92 min.ResultsGastric emptying time was delayed in 60% of subjects with PD. In comparison to mean t1/2 of 38 ± 7 min in controls, mean t1/2 was 58 ± 25 min in fPD (p = 0.02) and 46 ± 25 min in sPD (p = 0.10). Both fPD and sPD groups included subjects with delayed gastric emptying at an early stage of disease.ConclusionsPatients with fPD showed significantly delayed gastric emptying in comparison to normal age-matched individuals. Further studies of gastrointestinal dysfunction in PD, particularly fPD, are warranted. 相似文献
50.