全文获取类型
收费全文 | 553483篇 |
免费 | 297407篇 |
国内免费 | 52807篇 |
专业分类
耳鼻咽喉 | 5413篇 |
儿科学 | 8224篇 |
妇产科学 | 8658篇 |
基础医学 | 124340篇 |
口腔科学 | 7869篇 |
临床医学 | 98667篇 |
内科学 | 142480篇 |
皮肤病学 | 8062篇 |
神经病学 | 37921篇 |
特种医学 | 19100篇 |
外国民族医学 | 130篇 |
外科学 | 74993篇 |
综合类 | 95415篇 |
现状与发展 | 59篇 |
一般理论 | 64篇 |
预防医学 | 59694篇 |
眼科学 | 25026篇 |
药学 | 87652篇 |
215篇 | |
中国医学 | 59189篇 |
肿瘤学 | 40526篇 |
出版年
2023年 | 6467篇 |
2022年 | 14041篇 |
2021年 | 17638篇 |
2020年 | 16225篇 |
2019年 | 22147篇 |
2018年 | 23333篇 |
2017年 | 22652篇 |
2016年 | 20865篇 |
2015年 | 25036篇 |
2014年 | 28099篇 |
2013年 | 27254篇 |
2012年 | 34566篇 |
2011年 | 38300篇 |
2010年 | 31123篇 |
2009年 | 35653篇 |
2008年 | 27867篇 |
2007年 | 24983篇 |
2006年 | 24090篇 |
2005年 | 24515篇 |
2004年 | 21034篇 |
2003年 | 19098篇 |
2002年 | 18032篇 |
2001年 | 18954篇 |
2000年 | 14933篇 |
1999年 | 20403篇 |
1998年 | 18229篇 |
1997年 | 18055篇 |
1996年 | 18149篇 |
1995年 | 18026篇 |
1994年 | 17375篇 |
1993年 | 15178篇 |
1992年 | 15642篇 |
1991年 | 14498篇 |
1990年 | 13113篇 |
1989年 | 12673篇 |
1988年 | 12047篇 |
1987年 | 11359篇 |
1986年 | 10566篇 |
1985年 | 9439篇 |
1984年 | 7150篇 |
1983年 | 7029篇 |
1982年 | 7863篇 |
1981年 | 7358篇 |
1980年 | 7006篇 |
1979年 | 6945篇 |
1978年 | 5992篇 |
1977年 | 6261篇 |
1976年 | 5868篇 |
1975年 | 5588篇 |
1974年 | 5174篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
992.
Naoya Katsuragi Yutsuki Nakajima Yuji Shiraishi Masahiro Hashizume Nobumasa Takahashi 《The Japanese Journal of Thoracic and Cardiovascular Surgery》2005,53(8):440-442
We describe a case of a large bronchial fistula and empyema after right upper lobectomy that was treated successfully with
open window thoracostomy followed by a latissimus dorsi myocutaneous flap and limited thoracoplasty. A latissimus dorsi myocutaneous
flap can provide immediate airtight closure of a large bronchial fistula, allowing lavage and curettage of the empyema cavity
to reduce the chance of postoperative infection. An important aspect of this technique is that the deepithelialized skin side
rather than muscle is sutured to an opening of the bronchus. As compared with other techniques, a latissimus dorsi myocutaneous
flap is superior in that it requires a single incision and does not require an intraop-erative change of position. In addition,
the technique causes little dysfunction of the chest and shoulder and preserves the vascular supply to ensure the viability
of the flap even if it was divided in a previous operation. 相似文献
993.
Ting-Kai Leung Chien-Jui Cheng Chi-Ming Lee Li-Kuo Shen Hung-Jung Wang Ya-Yen Chen 《中华医学杂志(英文版)》2005,118(17):1493-1496
The current report focuses on two patients of the same age who presented similar appearances on initial anteroposterior chest images. Follow-up images showed superoanterior and superoposterior mediastinal lesions. The first patient with noninvasive cystic thymoma was suspected before surgery, while the pathologic diagnosis was intrathoracic phrenic nerve schwannoma. The second patient was with an asymmetric, dumbbell-shaped paravertebral tumor over T3 and T4 on the left side. The preoperative… 相似文献
994.
Background
Glioblastoma multiforme is the most malignant form of brain tumor. Despite treatment including surgical resection, adjuvant chemotherapy, and radiation, these tumors typically recur. The recurrent tumor is often resistant to further therapy with the same agent, suggesting that the surviving cells that repopulate the tumor mass have an intrinsic genetic advantage. We previously demonstrated that cells selected for resistance to 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU) are near-diploid, with over-representation of part or all of chromosomes 7 and 22. While cells from untreated gliomas often have over-representation of chromosome 7, chromosome 22 is typically under-represented. 相似文献995.
Yusen Chen Jun Nakura Jing-Ji Jin Zhihong Wu Miyuki Yamamoto Michiko Abe Yasuharu Tabara Yoshikuni Yamamoto Michiya Igase Xiao Bo Katsuhiko Kohara Tetsuro Miki 《Hypertension research》2003,26(6):439-444
The beta-adrenoceptor (beta-AR)-stimulatory guanine nucleotide-binding (Gs) protein system has been shown to play important roles in the cardiovascular system. The gene encoding the alpha-subunit of Gs proteins (GNAS1) is a candidate genetic determinant for hypertension. Because alcohol consumption is known to affect blood pressure partly through the beta-AR-Gs protein system, we examined the possible interaction between GNAS1 T393C polymorphism and drinking status in the association with hypertension in the present study. As a result, a non-significant but reasonable trend supporting the presence of an interaction was shown (p = 0.076). In line with this trend, the T393C polymorphism significantly interacted with drinking status in the association with systolic blood pressure (p = 0.028). Moreover, supporting the presence of an interaction, T allele carriers consistently had a higher probability of hypertension, higher systolic blood pressure, and higher diastolic blood pressure than CC homozygotes in non-drinkers and light drinkers. In contrast, CC homozygotes consistently had a higher probability of hypertension, higher systolic blood pressure, and higher diastolic blood pressure than T allele carriers in moderate to heavy drinkers. The present study also showed a significant interaction between the T393C polymorphism and drinking status in the association with pulse pressure (p = 0.026), reflected by a significant association between the T393C polymorphism and pulse pressure in moderate to heavy drinkers (p = 0.026). These findings may be helpful in conducting further molecular and biological studies on the relationship among the effects of alcohol, the beta-AR-Gs protein system, and hypertension. 相似文献
996.
997.
通过三年资料实证医院检验科常规项目全成本 总被引:2,自引:0,他引:2
目的弄清医院常规检验项目的实际成本,为医院及卫生主管部门进行科学管理和政府物价部门制订科学合理的收费价格体系提供科学依据。方法对某二级甲等医院检验科3年中所开展的全部7大类16个项目组169个检验项目的成本按耗材、设备折旧、劳务费、房屋折旧、业务费与后勤管理费共5大类进行实证分析。结果该科的成本构成比是:耗材成本34.1%、设备折旧24.3%、劳务费30.0%、房屋折旧4.0%、业务费与后勤管理费7.6%;检验项目的每项次平均成本为7.17元;成本最低的两类检验项目是生化及定性免疫,其项次成本分别为3.18元和4.25元;最高的则为微生物和血库,项次成本分别为48.63元和35.21元;项次成本过百元的有7项,多为输血项目;5至10倍于平均成本的28项,2至5倍于全科平均成本的22项,其余112项介于全科平均成本上下。结论实证研究是准确掌握检验项目成本的有效方法。 相似文献
998.
教学活动包括诸要素,其中一个常被人忽视的要素就是教学软环境。教学软环境的优劣在某种程度上决定着教学活动的成效。教师在教学活动中应设法构建良好的教学软环境,营造良好的课堂气氛,取得最佳的教学效果。 相似文献
999.
1000.
Abstract Simultaneous bilateral avulsions of the tibial tuberosity are rare injuries. The authors found only five reported cases in
the orthopedic literature. We add a further case of bilateral avulsions of the tibial tuberosity with the longest reported
follow-up. 相似文献