全文获取类型
收费全文 | 434757篇 |
免费 | 25860篇 |
国内免费 | 19151篇 |
专业分类
耳鼻咽喉 | 3407篇 |
儿科学 | 9140篇 |
妇产科学 | 6386篇 |
基础医学 | 46815篇 |
口腔科学 | 5986篇 |
临床医学 | 48292篇 |
内科学 | 68423篇 |
皮肤病学 | 3272篇 |
神经病学 | 30202篇 |
特种医学 | 18689篇 |
外国民族医学 | 155篇 |
外科学 | 54205篇 |
综合类 | 47646篇 |
现状与发展 | 62篇 |
一般理论 | 21篇 |
预防医学 | 34946篇 |
眼科学 | 10466篇 |
药学 | 36803篇 |
229篇 | |
中国医学 | 16484篇 |
肿瘤学 | 38139篇 |
出版年
2024年 | 871篇 |
2023年 | 4182篇 |
2022年 | 10855篇 |
2021年 | 13508篇 |
2020年 | 10307篇 |
2019年 | 8925篇 |
2018年 | 30509篇 |
2017年 | 25295篇 |
2016年 | 26838篇 |
2015年 | 13122篇 |
2014年 | 15669篇 |
2013年 | 13790篇 |
2012年 | 25617篇 |
2011年 | 41546篇 |
2010年 | 31175篇 |
2009年 | 21278篇 |
2008年 | 32332篇 |
2007年 | 34868篇 |
2006年 | 14056篇 |
2005年 | 15403篇 |
2004年 | 12578篇 |
2003年 | 13772篇 |
2002年 | 10571篇 |
2001年 | 7346篇 |
2000年 | 7072篇 |
1999年 | 6735篇 |
1998年 | 4276篇 |
1997年 | 4213篇 |
1996年 | 3239篇 |
1995年 | 3026篇 |
1994年 | 2512篇 |
1993年 | 1600篇 |
1992年 | 2108篇 |
1991年 | 1829篇 |
1990年 | 1548篇 |
1989年 | 1281篇 |
1988年 | 1147篇 |
1987年 | 1008篇 |
1986年 | 806篇 |
1985年 | 616篇 |
1984年 | 374篇 |
1983年 | 281篇 |
1982年 | 182篇 |
1981年 | 157篇 |
1980年 | 157篇 |
1979年 | 149篇 |
1975年 | 62篇 |
1974年 | 75篇 |
1938年 | 64篇 |
1932年 | 57篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
201.
202.
203.
Christian Waydhas Dieter Nast-Kolb Steffen Ruchholtz 《European journal of trauma and emergency surgery》2007,33(2):170-175
Abstract
Objective: To define the diagnostic accuracy of clinical examination in patients with impaired consciousness or endotracheal intubation
to detect pelvic ring fractures and to identify those with severe bleeding.
Methods: Included in this prospective data collection with retrolective data analysis were a consecutive series of blunt trauma victims
with either a Glasgow Coma Scale ≤ 13 or tracheal intubation. Clinical examination comprised testing for stability of the
iliac wings.
Results: From 784 subjects (injury severity score 23.3 ± 17.4) 93 patients (11.9%) were found to have a pelvic ring fracture. Clinical
instability of the pelvic ring was found in 42 patients. There was only one false positive. Fifty-two fractures could not
be identified by clinical examination, including nine fractures (17%) that required surgical fracture stabilization (sensitivity
of clinical examination 44.1%). Seventeen fractures (18.3%) were associated with a blood loss larger than 20% of circulating
blood volume. Sixteen of those were identified by clinical instability of the pelvic ring (sensitivity 94.1%, specificity
97.0%, positive predictive value 38.1%, negative predictive value 99.9%).
Conclusions: Clinical examination for stability of the pelvis in this selected group of patients missed a significant number of pelvic
ring fractures including fractures that require surgical stabilization. The finding of a clinically unstable identifies most
of the patients with the pelvic ring fracture being a major source of bleeding. A stable pelvis makes pelvic ring fracture
as being the source of bleeding quite unlikely. 相似文献
204.
目的 初步建立阴道粘膜上皮细胞体外培养方法,为阴道粘膜上皮研究提供实验模型.方法 取雌性新西兰大白兔阴道粘膜组织小块,胶原酶Ⅳ和胰蛋白酶联合消化分离法收集上皮细胞,接种于角朊细胞无血清培养液中静置培养、传代.动态观察细胞生长增殖情况,扫描和透射电镜观察超微结构,流式细胞仪测定细胞增殖周期,并进行免疫组织化学鉴定.结果 体外培养的阴道粘膜上皮细胞为二倍体细胞,增殖状态良好,细胞间可见桥粒连接,免疫组化角蛋白染色阳性.细胞的超微结构和免疫组化染色均具有上皮细胞特征.结论 在本实验条件下,体外培养的阴道粘膜上皮细胞具有较好的增殖能力,可作为阴道粘膜上皮研究的理想实验模型. 相似文献
205.
206.
目的:建立乳腺非典型增生病动物模型,探讨非典型增生与血管生成的关系。方法:采用灌服二甲基苯蒽+颈部枷具方法复制大鼠肝郁血瘀型乳腺非典型增生动物模型,并给予中药乳复汤治疗。常规染色观察大鼠乳腺组织病理组织形态.免疫组化方法检测MVD、VEGF和bFGF的表达。结果:病证模型组乳腺非典型增生率90%.较单纯造模组高.P=0.0415;中药乳复汤治疗组非典型增生率较病证模型组低.P=0.0459;随着一般增生到非典型增生程度加重,MVD计数增多,VEGF、bFGF的表达升高,P〈0.05。结论:病证结合造模更适合中医动物实验要求,中药乳复汤具有抑制血管生成作用。 相似文献
207.
The authors reviewed the radiographic manifestations of 17 cases of parosteal osteosarcoma, with pathologic correlation in 15. There were two types of parosteal osteosarcoma radiologically. The majority of cases were type I with uniformly dense masses which had regular borders. They often adhered to the cortex and showed no evidence of soft-tissue invasion which correlated with low-grade pathologic malignancy and a relatively benign clinical course. Type II involved the bone, soft-tissue and the medullary cavity. These lesions were poorly differentiated and frequently accompanied by metastatic lesions.
相似文献
208.
209.
This paper is a summary of our observations on 105 cases of infantile spasms. The age of onset was around six months after birth, but the patients came for treatment mainly about one year after onset. Fever of unknown cause, asphyxia, birth injury, infection of the central nervous system, tuberous sclerosis, phenylketonuria and recent immunization etc. were complained. Clinically, it is characterized by head nodding, mental retardation, myoclonic jerks and various neurologic deficits. EEG findings showed classical or modified arrythmia or other epileptiform patterns. About one third of 22 cases examined had abnormal brain stem auditory evoked potentials. Among 42 patients who underwent CT scanning before ACTH treatment, 18 were normal and 7 abnormal; during ACTH treatment 3 normal and 4 abnormal; after completion of treatment, 4 normal and 6 abnormal, suggesting no further atrophy of the brain. Examination of trace elements of the hair by particle-induced X-ray emission (PIXE) method in 23 patients revealed a significant difference in lead, calcium and zinc contents between patients and 101 controls, but no statistical difference in iron and copper contents between the two groups. Sodium valproate, prednisone and ACTH appear to be effective in the treatment of infantile spasms. Eight patients fully recovered, and they can go to school without difficulty. Many patients derived various degrees of improvement to the satisfaction of their parents. Two patients were still amented and often attacked by myoclonus. The effects, side effects of these drugs, and the possible pathogenesis were discussed.
相似文献
210.