全文获取类型
收费全文 | 1876篇 |
免费 | 105篇 |
国内免费 | 9篇 |
专业分类
耳鼻咽喉 | 57篇 |
儿科学 | 77篇 |
妇产科学 | 55篇 |
基础医学 | 148篇 |
口腔科学 | 63篇 |
临床医学 | 217篇 |
内科学 | 495篇 |
皮肤病学 | 19篇 |
神经病学 | 98篇 |
特种医学 | 207篇 |
外科学 | 143篇 |
综合类 | 12篇 |
一般理论 | 3篇 |
预防医学 | 108篇 |
眼科学 | 35篇 |
药学 | 126篇 |
中国医学 | 5篇 |
肿瘤学 | 122篇 |
出版年
2022年 | 15篇 |
2021年 | 29篇 |
2020年 | 15篇 |
2019年 | 23篇 |
2018年 | 25篇 |
2017年 | 27篇 |
2016年 | 17篇 |
2015年 | 26篇 |
2014年 | 35篇 |
2013年 | 57篇 |
2012年 | 76篇 |
2011年 | 70篇 |
2010年 | 44篇 |
2009年 | 55篇 |
2008年 | 87篇 |
2007年 | 88篇 |
2006年 | 74篇 |
2005年 | 82篇 |
2004年 | 73篇 |
2003年 | 51篇 |
2002年 | 59篇 |
2001年 | 41篇 |
2000年 | 51篇 |
1999年 | 56篇 |
1998年 | 59篇 |
1997年 | 77篇 |
1996年 | 51篇 |
1995年 | 42篇 |
1994年 | 43篇 |
1993年 | 37篇 |
1992年 | 46篇 |
1991年 | 40篇 |
1990年 | 37篇 |
1989年 | 36篇 |
1988年 | 48篇 |
1987年 | 40篇 |
1986年 | 41篇 |
1985年 | 33篇 |
1984年 | 19篇 |
1983年 | 17篇 |
1982年 | 16篇 |
1981年 | 10篇 |
1980年 | 9篇 |
1979年 | 6篇 |
1978年 | 13篇 |
1977年 | 8篇 |
1975年 | 10篇 |
1974年 | 8篇 |
1970年 | 9篇 |
1969年 | 13篇 |
排序方式: 共有1990条查询结果,搜索用时 15 毫秒
1.
2.
Amanda Leal Rocha Alessandra Figueiredo De Souza Laiz Fernandes Mendes Nunes Nayara Dias de Souza Cunha Clia Regina Moreira Lanza Denise Vieira Travassos Tarcília Aparecida da Silva 《Pediatric dermatology》2019,36(1):e27-e30
Drug‐induced reactions are complications associated with high mortality and significant morbidity. Stevens–Johnson Syndrome (SJS) and toxic epidermal necrolysis (TEN) are examples of these conditions, which are characterized by skin and mucous lesions. Here, we report a case of a 9‐year‐old girl who presented with blisters associated with an extensive vesicular rash and multiple ulcerations on the lips and oral cavity. A drug‐induced hypersensitivity reaction to antibiotics was suspected, and a diagnosis of TEN was made. The patient was managed with withdrawal of the suspected causative agent, and the oral lesions were treated with low‐level laser therapy (LLLT) and oral hygiene. This case highlights that TEN requires interdisciplinary intervention with dental assistance and follow‐up to improve symptoms, nutrition, systemic condition, and quality of life. 相似文献
3.
Intracranial circulation: pulse-sequence considerations in three- dimensional (volume) MR angiography 总被引:2,自引:0,他引:2
The technique and feasibility of magnetic resonance (MR) angiography of intracranial vessels were studied in 35 healthy volunteers. Variations in image orientation, repetition time (TR), and flip angle were evaluated to determine their effects on flow-related enhancement. Gradient modifications--including echo time (TE), motion compensation, bandwidth, and field of view--were also studied in an effort to reduce motion-induced phase shifts. Results indicated that a FISP (fast imaging with steady precession) sequence with a TR of 50 msec, TE of 15 msec, velocity compensation in the read and section-select directions, acceleration compensation in the read direction, anisotropic volume, and a 1.25-mm partition thickness produced three-dimensional angiographic MR images that were accurate and reproducible in the depiction of the major intracranial vessels. Difficulties with field of view, persistent signal void secondary to higher-order motion, and spatial resolution remain major problems requiring additional study. 相似文献
4.
3D FEA of cemented steel, glass and carbon posts in a maxillary incisor. 总被引:12,自引:0,他引:12
Alessandro Lanza Raffaella Aversa Sandro Rengo Davide Apicella Antonio Apicella 《Dental materials》2005,21(8):709-715
OBJECTIVES: A comparative study on the stress distribution in the dentine and cement layer of an endodontically treated maxillary incisor has been carried out by using Finite Element Analysis (FEA). The role of post and cement rigidity on reliability of endodontic restorations is discussed. METHODS: A 3D FEM model (13,272 elements and 15,152 nodes) of a central maxillary incisor is presented. A chewing static force of 10 N was applied at 125 degree angle with the tooth longitudinal axis at the palatal surface of the crown. Steel, carbon and glass fiber posts have been considered. The differences in occlusal load transfer ability when steel, carbon and glass posts, fixed to root canal using luting cements of different elastic moduli (7.0 and 18.7 GPa) are discussed. RESULTS AND SIGNIFICANCE: The more stiff systems (steel and carbon posts) have been evaluated to work against the natural function of the tooth. Maximum Von Mises equivalent stress values ranging from 7.5 (steel) to 5.4 and 3.6 MPa (respectively, for carbon posts fixed with high and low cement moduli) and to 2.2 MPa (either for glass posts fixed with high and low cement moduli) have been observed under a static masticatory load of 10 N. A very stiff post works against the natural function of the tooth creating zones of tension and shear both in the dentine and at the interfaces of the luting cement and the post. Stresses in static loading do not reach material (dentine and cement) failure limits, however, they significantly differ leading to different abilities of the restored systems to sustain fatigue loading. The influence of the cement layer elasticity in redistributing the stresses has been observed to be less relevant as the post flexibility is increased. 相似文献
5.
Megakaryocytic Progenitors Can Be Generated Ex Vivo and Safely Administered to Autologous Peripheral Blood Progenitor Cell Transplant Recipients 总被引:9,自引:1,他引:8
6.
Paediatric dacryocystorhinostomy 总被引:1,自引:0,他引:1
KN Hakin FRCS FRCOphth TJ Sullivan FRACO FRACS A Sharma FCOphth † RAN Welham FRCS FCOphth † 《Clinical & experimental ophthalmology》1994,22(4):231-235
Of 258 cases of dacryocystorhinostomy performed on children in the period September 1981 to September 1991, 130 were for simple, unresolved congenital nasolacrimal duct obstruction. Other indications for surgery included punctal agenesis, lacrimal fistula, post-traumatic and post-inflammatory canalicular obstruction. Of 177 children without canalicular pathology, 171 (96%) were relieved of symptoms with one operation, without canalicular intubation. Of 81 cases with canalicular disease, 55 of 70 (79%) who underwent DCR plus canalicular intubation, and 10 of 11 who underwent DCR plus Lester-Jones tube, were substantially improved with one operation. No child required peroperative or postoperative blood transfusion. Dacryocystorhinostomy in childhood, in experienced surgical hands, is a safe procedure, achieving relief of symptoms in most cases, particularly in the absence of canalicular disease. 相似文献
7.
8.
Stephen G Wolfe Rodney J Schlosser William E Bolger Donald C Lanza David W Kennedy 《Otolaryngology--head and neck surgery》2004,131(3):174-179
OBJECTIVE: To evaluate the success of endoscopic and endoscope-assisted resection of inverted sinonasal papillomas and to assess the indications for adjunctive external procedures. STUDY DESIGN: Retrospective chart review. RESULTS: Fifty patients were treated surgically during the 10-year study period and had greater than 1 year of follow-up care. These patients had a recurrence rate of 14% (7/50) with a mean follow-up of 31.1 months. Of these 7 patients with recurrences, 3 were treated primarily at this institution, and 4 had been treated prior to referral. Recurrence was 11% (3/27) for primary resections and 17% (4/23) for secondary resections. Average time to recurrence was 11.7 months. Of the patients, 38% (19/50) had adjunctive external procedures either during the initial resection or for the management of recurrent disease. CONCLUSIONS: Endoscopic and endoscope-assisted resections of inverted papilloma are effective techniques for managing inverted papilloma. The intraoperative findings, most importantly the site(s) of tumor attachment, dictate whether an endoscopic procedure is sufficient to complete resect the inverted papilloma or whether an adjunctive external procedure is required. Appropriate patient selection and an aggressive surgical approach are necessary for the management of these neoplasms. 相似文献
9.
10.
Factors influencing women to undergo screening mammography 总被引:2,自引:0,他引:2