全文获取类型
收费全文 | 324710篇 |
免费 | 29133篇 |
国内免费 | 22899篇 |
专业分类
耳鼻咽喉 | 3013篇 |
儿科学 | 3427篇 |
妇产科学 | 4926篇 |
基础医学 | 39989篇 |
口腔科学 | 5505篇 |
临床医学 | 45318篇 |
内科学 | 49758篇 |
皮肤病学 | 3086篇 |
神经病学 | 18383篇 |
特种医学 | 12005篇 |
外国民族医学 | 213篇 |
外科学 | 33239篇 |
综合类 | 49998篇 |
现状与发展 | 76篇 |
一般理论 | 20篇 |
预防医学 | 19652篇 |
眼科学 | 9578篇 |
药学 | 32851篇 |
334篇 | |
中国医学 | 17480篇 |
肿瘤学 | 27891篇 |
出版年
2024年 | 1009篇 |
2023年 | 5025篇 |
2022年 | 13083篇 |
2021年 | 16439篇 |
2020年 | 12069篇 |
2019年 | 10911篇 |
2018年 | 11435篇 |
2017年 | 9938篇 |
2016年 | 9366篇 |
2015年 | 14380篇 |
2014年 | 17836篇 |
2013年 | 15378篇 |
2012年 | 22830篇 |
2011年 | 25844篇 |
2010年 | 15936篇 |
2009年 | 12272篇 |
2008年 | 17041篇 |
2007年 | 17033篇 |
2006年 | 17076篇 |
2005年 | 16793篇 |
2004年 | 10677篇 |
2003年 | 9772篇 |
2002年 | 8447篇 |
2001年 | 7473篇 |
2000年 | 8279篇 |
1999年 | 9022篇 |
1998年 | 5476篇 |
1997年 | 5502篇 |
1996年 | 4333篇 |
1995年 | 3923篇 |
1994年 | 3213篇 |
1993年 | 2099篇 |
1992年 | 2827篇 |
1991年 | 2415篇 |
1990年 | 2117篇 |
1989年 | 1861篇 |
1988年 | 1563篇 |
1987年 | 1354篇 |
1986年 | 1107篇 |
1985年 | 912篇 |
1984年 | 526篇 |
1983年 | 373篇 |
1982年 | 242篇 |
1981年 | 238篇 |
1980年 | 188篇 |
1979年 | 221篇 |
1978年 | 82篇 |
1977年 | 89篇 |
1974年 | 102篇 |
1973年 | 83篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
Transarterial embolisation of complex cavernous sinus dural arteriovenous fistulae with low-concentration cyanoacrylate 总被引:1,自引:0,他引:1
We report the effectiveness of low-concentration n-butyl-2-cyanoacrylate (NBCA)-Lipiodol-tungsten mixture (10–15 %) in the
management of patients with aggressive or recurrent complex cavernous dural arteriovenous fistulae (CSDAVF). We treated five
patients with complex CSDAVF with a low concentration of an NBCA-Lipiodol-tungsten mixture after catheterisation of the feeding
arteries arising from the external carotid artery. Three had a recurrent CSDAVF after transarterial particulate embolisation.
Three refused transvenous treatment or could not be treated in this way; two patients had also feeding dural branches of the
internal carotid artery. All patients had complete resolution of symptoms and signs within a month of the procedure. No definite
neurological complication was found during follow-up ranging from 12 to 36 months. Transarterial embolisation with low-concentration
cyanoacrylate appears to be an effective alternative management of aggressive or recurrent CSDAVF.
Received: 8 November 1999/Accepted: 2 March 2000 相似文献
992.
993.
994.
995.
996.
引入市场机制,采取分权、分级与分类管理等政策与措施是当今国际卫生体制改革中的主流特点,由于各个国家的社会经济体制与卫生保健制度不同,这些改革政策与措施所产生的影响与效果也各具特色.因此,在深化我国卫生体制改革的进程中,借鉴国际卫生体制改革的经验与教训具有一定的现实意义. 相似文献
997.
喉鳞状细胞癌组织体外原代培养的初步研究 总被引:1,自引:0,他引:1
目的 应用体外培养技术,对喉鳞状细胞癌组织进行体外培养,探讨喉鳞癌组织原代培养中的各种影响因素,为建立人喉鳞癌组织的细胞系提供实验基础。方法采用体外组织培养技术,对24例人喉鳞状细胞癌组织进行原代培养,观察原代培养中肿瘤细胞的生长与供体的年龄、肿瘤组织的分化程度及不同培养方法的关系,分析在人喉鳞癌细胞的培养中成纤维细胞、微生物污染的影响。结果 24例人喉鳞状细胞癌组织标本,年龄小于60岁组的细胞生长率为31.25%(5/16例),年龄大于60岁组为37.5%(3/8例);高分化组为100%(2/2例),中分化组为30.8%(4/13例),低分化组25%(2/8例);组织块培养法为43.75%(7/16例),酶消化法培养为10%(1/10例);倒置显微镜下观察,在培养的第5~7天,在贴壁组织块周围可见到有上皮样细胞爬出。全部标本中,成纤维细胞的过度生长和微生物的污染是阻碍人喉鳞癌细胞生长的重要因素。结论培养组织的细胞生长率与供体的年龄关系不大;肿瘤组织的分化程度较高者,细胞的生长率较高;与酶消化分离培养法相比,贴壁组织块培养法的细胞生长率较高;成纤维细胞及微生物的污染是阻碍人喉鳞癌细胞系建立的重要因素。 相似文献
998.
OBJECTIVE: To find out the prevalence of pneumatization of perpendicular plate of the ethmoid bone, and to discuss the diagnosis and management of perpendicular plate mucocele (nasal septal mucocele). METHODS: The CT data from 32 patients with septal deviation were reviewed, and an unusual case of perpendicular plate mucocele was reported. RESULTS: Six cases (6/32, 18%) were found to have pneumatization of perpendicular plate of the ethmoid bone, with 2 located in the anterior portion (frontal-septal pneumatization), and 4 located in the posterior portion (spheno-septal pneumatization). A patient with perpendicular plate mucocele was treated by the technique of marsupialization under nasal endoscope. This patient was followed-up for 10 months without recurrence. CONCLUSION: As a kind of variation of nasal septum, the clinical significance of pneumatization of perpendicular plate should be emphasized. We reported the first case of perpendicular plate mucocele, originated possibly from the pneumatization of perpendicular plate of the ethmoid bone. Marsupialization under endoscope was considered to be the initial management for this unusual disease. 相似文献
999.
Ming Liu Bing Zhou Hua-chao Liu Sheng-zhong Zhang Yu-xin Wang Qian Huang 《中华耳鼻咽喉科杂志》2003,38(4):251-254
OBJECTIVE: To discuss the clinical presentation, diagnostic criterion and treatment principle of acute fulminant invasive fungal rhinosinusitis (AFFS). METHODS: Six patients were diagnosed as AFFS based on history, nose, especially eye symptoms with or without fever, sinus CT and MRI, endoscopic and cytological findings in the nasal cavity. Surgical debridement was performed on 5 of 6 biopsy proven AFFS patients, one of them being amputated of the orbital content. With the original disease controlled simultaneously, 4 of 5 patients were prescribed with systemic amphotericin B or liposomal amphotericin B (1 case) and one with Itraconazole orally. One patient had not been involved with any of the anti-fungi measures. RESULT: Mucor (Zygomycetes) was identified on culture in 1 patient, Rhizopus species in 2, Aspergillus in 1, Alternaria in 1 and mixed Mucor and Rhizopus in 1. All patients were proved of tissue invasion histopathologically through biopsy. One patient died without any anti-fungi therapy on the 7th admission day, 3 patients survived for 88 days, 32 and 6 months respectively and died of original diseases (diabetes 1, leukaemia 2). One patient survived 9 months and lost for follow-up, 1 patient survived 11 months after treatment. CONCLUSION: A high index of suspicion and early endoscopic investigation through nasal cavity with fungal investigation should highly be strengthened for recognition of this disease. MRI findings should be considered as, or even more, important as that of CT scan on the early diagnoses. Extensive and aggressive surgical debridement, prompt and enough dosage of antifungal therapy intravenously, together with serious controlling of the underlying disease, all take important roles in the complete control of the disease. 相似文献
1000.
前庭水管扩大综合征患者的人工耳蜗植入术 总被引:19,自引:2,他引:19
目的 评价前庭水管扩大综合征患者人工耳蜗植入术的安全性和可行性。方法 1995年5月1日~2002年6月1日因双耳重-极重度感音神经性聋在北京协和医院接受人工耳蜗植入术的患者312例中诊断为双耳前庭水管扩大者10例(3.2%),其中语前聋7例,语后聋3例。回顾性分析这10例患者的临床资料。结果 10例患者人工耳蜗电极植入顺利,8例耳蜗底回开窗时发生轻度井喷,迅速用颞肌筋膜牢固封闭圆窗制止井喷。全部患者术后未出现脑脊液漏、颅内感染、面瘫、中耳炎等并发症。开机6个月时8例患者具有开放性言语识别力,已进入普通学校(幼儿园、小学、大学)就读。另2例语前聋的幼儿视觉强化测听听阈达40dB HL,与其他无内耳畸形的全聋儿童术后效果差异无显著性。全聋前语言能力较好的5例患者术后语言能力明显好于语前聋的患者,语言交流基本听不出聋人特有的语音特征。另5例患者语言均有不同程度的进步。结论 尽管前庭水管扩大患者在人工耳蜗植入术中可能出现井喷,但术后未出现并发症且听力-言语康复效果好,因此重-极重度聋的前庭水管扩大综合征患者行人工耳蜗植入术是安全可行的。 相似文献