全文获取类型
收费全文 | 19454篇 |
免费 | 1811篇 |
国内免费 | 924篇 |
专业分类
耳鼻咽喉 | 156篇 |
儿科学 | 302篇 |
妇产科学 | 366篇 |
基础医学 | 2147篇 |
口腔科学 | 409篇 |
临床医学 | 2350篇 |
内科学 | 2960篇 |
皮肤病学 | 256篇 |
神经病学 | 901篇 |
特种医学 | 609篇 |
外国民族医学 | 7篇 |
外科学 | 1935篇 |
综合类 | 2446篇 |
现状与发展 | 1篇 |
一般理论 | 11篇 |
预防医学 | 2823篇 |
眼科学 | 429篇 |
药学 | 1747篇 |
8篇 | |
中国医学 | 695篇 |
肿瘤学 | 1631篇 |
出版年
2024年 | 68篇 |
2023年 | 305篇 |
2022年 | 677篇 |
2021年 | 761篇 |
2020年 | 640篇 |
2019年 | 565篇 |
2018年 | 682篇 |
2017年 | 581篇 |
2016年 | 543篇 |
2015年 | 811篇 |
2014年 | 990篇 |
2013年 | 1071篇 |
2012年 | 1329篇 |
2011年 | 1452篇 |
2010年 | 1004篇 |
2009年 | 832篇 |
2008年 | 941篇 |
2007年 | 963篇 |
2006年 | 929篇 |
2005年 | 876篇 |
2004年 | 623篇 |
2003年 | 578篇 |
2002年 | 483篇 |
2001年 | 461篇 |
2000年 | 429篇 |
1999年 | 570篇 |
1998年 | 421篇 |
1997年 | 453篇 |
1996年 | 383篇 |
1995年 | 293篇 |
1994年 | 187篇 |
1993年 | 217篇 |
1992年 | 129篇 |
1991年 | 95篇 |
1990年 | 90篇 |
1989年 | 89篇 |
1988年 | 118篇 |
1987年 | 100篇 |
1986年 | 74篇 |
1985年 | 64篇 |
1984年 | 33篇 |
1983年 | 36篇 |
1982年 | 29篇 |
1981年 | 26篇 |
1980年 | 18篇 |
1979年 | 37篇 |
1978年 | 17篇 |
1977年 | 15篇 |
1976年 | 19篇 |
1975年 | 15篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
43.
MED术中应用自制器械处理后纵韧带钙化及骨赘增生 总被引:1,自引:0,他引:1
目的探讨脊柱后路显微内镜(microendoscopic disectomy,MED)手术治疗腰椎间盘突出症合并后纵韧带钙化及椎体后缘骨赘增生的方法. 方法 MED手术中应用自制弧形纤维环刀和L形打入器治疗115例该类患者. 结果全组随访12~30个月,平均22个月,按MacNab标准:优、良109例,可5例,差1例,优良率94.8(109/115).未出现硬脊膜破裂及神经孙上,未发生椎间隙感染,无中转开放手术. 结论正确运用MED技术,配合采用自制器械及相应的改良方法,能较好地处理合并后纵韧带钙化及椎体后缘骨赘增生的难题,进一步扩大了手术适应证范围,提高了疗效及安全性. 相似文献
44.
Feng-Yuan Liu Chien-Yu Lin Joseph T Chang Shu-Hang Ng Shy-Chyi Chin Hung-Ming Wang Chun-Ta Liao Sheng-Chieh Chan Tzu-Chen Yen 《Journal of nuclear medicine》2007,48(10):1614-1619
Conventional work-up (CWU) with chest radiography, abdominal ultrasonography, and skeletal scintigraphy has limited value in M staging of nonkeratinizing nasopharyngeal carcinoma (NPC). Our aim was to evaluate whether (18)F-FDG PET could replace CWU by comparing their diagnostic efficacies. METHODS: Patients with histologically proven nonkeratinizing NPC and no prior treatment were prospectively enrolled. All study participants underwent CWU and (18)F-FDG PET for primary M staging. Distant metastasis was considered to be present if there was any reliable evidence identified within 1 y after diagnosis. The comparative diagnostic efficacies of (18)F-FDG PET, CWU, and the combination of (18)F-FDG PET and CWU (PET+CWU) were evaluated using the areas under the receiver-operating-characteristic (ROC) curves. RESULTS: Sixty-one (20.3%) of 300 eligible patients were found to have distant metastases. On a patient-based analysis, (18)F-FDG PET was found to be more effective than CWU (P < 0.001), whereas it was equally effective with PET+CWU (P = 0.130). On region-based analyses, (18)F-FDG PET was more effective than skeletal scintigraphy and chest radiography for detecting bone metastases (P < 0.001) and chest metastases (P < 0.001), respectively. (18)F-FDG PET and abdominal ultrasound were equally effective for detecting hepatic metastases (P = 0.127). On region-based analyses, the combination of (18)F-FDG PET and CWU did not yield any noticeable increase in diagnostic efficacy. CONCLUSION: (18)F-FDG PET can replace CWU in primary M staging of nonkeratinizing NPC. 相似文献
45.
46.
47.
48.
49.
BACKGROUND: Cutaneous metastasis from adenoid cystic carcinoma of the salivary gland is very rare. OBJECTIVE: To present an unusual case of cutaneous metastasis from adenoid cystic carcinoma of the right parotid gland. METHODS: A 63-year-old woman with multiple subcutaneous nodules on the abdomen and a gradually enlarged mass over the right parotid area was examined. A skin biopsy was taken from one of the abdominal nodules. RESULT: Skin biopsy demonstrated the characteristic histopathologic features of metastatic adenoid cystic carcinoma. A subsequent computerized tomography of the head and neck revealed a huge soft tissue mass involving the right parotid gland. Computerized tomography of the chest revealed extensive nodular pleural thickening, and pleural biopsy also showed typical histopathologic features of metastatic adenoid cystic carcinoma. All of these results are consistent with the diagnosis of an adenoid cystic carcinoma of the right parotid gland with disseminated metastases. CONCLUSION: We report a rare case of cutaneous metastasis from adenoid cystic carcinoma of the right parotid gland. The presentation of cutaneous metastasis is often nonspecific and may mimic benign lesions. Subcutaneous nodules that are rapidly developing or eruptive, are rapidly growing and have stony hardness in nature, have pain or tenderness, and have nonhealing ulceration remind us of the possibility of cutaneous metastases. Dermatologists and dermatologic surgeons should keep the diagnosis of cutaneous metastasis in mind and always perform skin biopsy when encountering these lesions. 相似文献
50.
影响肝外伤手术死亡的危险因素分析 总被引:3,自引:1,他引:2
目的分析影响肝外伤手术死亡的危险因素,探讨其临床意义。方法根据AAST和ISS标准,回顾性分析90例肝外伤手术病例,对影响手术死亡的危险因素进行单因素比较和Logistic回归分析。结果死亡15例,其中Ⅲ级2例、Ⅳ级4例、Ⅴ级9例,总体手术死亡率17%。Ⅳ~Ⅴ级肝外伤手术方式的单因素比较提示:清创性肝切除术的相对危险度是0.73;而规则性肝切除术、肝静脉或肝后下腔静脉修补术相对危险度分别是1.32、1.52。Logistic回归分析提示:ISS分会和术中失血量是影响手术死亡率的2个独立因素。结论ISS分值、术中失出血量和手术方式是影响肝外伤手术死亡的3个重要因素,娴熟的手术技能和合理的手术方式可以减少术中出血量和降低手术死亡率。 相似文献