全文获取类型
收费全文 | 12887篇 |
免费 | 1131篇 |
国内免费 | 376篇 |
专业分类
耳鼻咽喉 | 117篇 |
儿科学 | 91篇 |
妇产科学 | 274篇 |
基础医学 | 985篇 |
口腔科学 | 242篇 |
临床医学 | 1125篇 |
内科学 | 791篇 |
皮肤病学 | 54篇 |
神经病学 | 492篇 |
特种医学 | 276篇 |
外国民族医学 | 6篇 |
外科学 | 2940篇 |
综合类 | 2283篇 |
现状与发展 | 2篇 |
预防医学 | 644篇 |
眼科学 | 78篇 |
药学 | 1599篇 |
22篇 | |
中国医学 | 1090篇 |
肿瘤学 | 1283篇 |
出版年
2024年 | 38篇 |
2023年 | 237篇 |
2022年 | 399篇 |
2021年 | 612篇 |
2020年 | 539篇 |
2019年 | 418篇 |
2018年 | 422篇 |
2017年 | 438篇 |
2016年 | 473篇 |
2015年 | 452篇 |
2014年 | 878篇 |
2013年 | 966篇 |
2012年 | 824篇 |
2011年 | 872篇 |
2010年 | 674篇 |
2009年 | 633篇 |
2008年 | 633篇 |
2007年 | 559篇 |
2006年 | 522篇 |
2005年 | 452篇 |
2004年 | 457篇 |
2003年 | 399篇 |
2002年 | 345篇 |
2001年 | 280篇 |
2000年 | 270篇 |
1999年 | 216篇 |
1998年 | 226篇 |
1997年 | 176篇 |
1996年 | 172篇 |
1995年 | 143篇 |
1994年 | 123篇 |
1993年 | 102篇 |
1992年 | 90篇 |
1991年 | 70篇 |
1990年 | 49篇 |
1989年 | 48篇 |
1988年 | 25篇 |
1987年 | 41篇 |
1986年 | 14篇 |
1985年 | 24篇 |
1984年 | 16篇 |
1983年 | 12篇 |
1982年 | 11篇 |
1981年 | 7篇 |
1980年 | 7篇 |
1978年 | 11篇 |
1977年 | 5篇 |
1976年 | 5篇 |
1975年 | 5篇 |
1970年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 281 毫秒
1.
2.
3.
4.
Tasuku Ogita Rosaly Vallejo Manaois Manabu Wakagi Tomoyuki Oki Yuko Takano Ishikawa 《International journal of food sciences and nutrition》2016,67(4):431-440
Two cultivars of Japanese parsley were harvested in different seasons; their antioxidant capacities were evaluated by oxygen radical absorbance capacity (ORAC) methods, and the contents of hydrophilic and lipophilic antioxidants were compared. Japanese parsley possessed potent antioxidant capacities both in hydrophilic and lipophilic extracts when evaluated by ORAC methods. LC/MS/MS analyses revealed that chlorogenic acid and four kinds of quercetin glycosides were major antioxidants in the hydrophilic extract. Lutein was the main contributor to the antioxidant capacity of the lipophilic extract. Antioxidant capacities of the hydrophilic extracts of both cultivars tended to be higher in winter because of the increase in the contents of chlorogenic acid and quercetin glycosides. An obvious trend in the lipophilic antioxidant capacities or lutein contents was not observed irrespective of the cultivar. 相似文献
5.
Iria Montero Prez Laura Rodríguez‐Pazos Adriana lvarez‐Prez MªMercedes Pereiro Ferreirs Carlos Aliste Jose Manuel Suarez‐Pearanda Jaime Toribio 《Journal of cutaneous pathology》2015,42(11):889-893
Classical Kaposi sarcoma (KS) usually appears on lower extremities accompanied or preceded by local lymphedema. However, the development in areas of chronic lymphedema of the arms following mastectomy, mimicking a Stewart–Treves syndrome, has rarely been described. We report an 81‐year‐old woman who developed multiple, erythematous to purple tumors, located on areas of post mastectomy lymphedema. Histopathological examination evidenced several dermal nodules formed by spindle‐shaped cells that delimitated slit‐like vascular spaces with some red cell extravasation. Immunohistochemically, the human herpesvirus type 8 (HHV‐8) latent nuclear antigen‐1 was detected in the nuclei of most tumoral cells confirming the diagnosis of KS. Lymphedema could promote the development of certain tumors by altering immunocompetence. Although angiosarcoma (AS) is the most frequent neoplasia arising in the setting of chronic lymphedema, other tumors such as benign lymphangiomatous papules (BLAP) or KS can also develop in lymphedematous limbs. It is important to establish the difference between AS and KS because their prognosis and treatment are very different. Identification by immunohistochemistry of HHV‐8 is useful for the distinction between KS and AS or BLAP. 相似文献
6.
目的:研究全麻复合硬膜外在高龄患者腹腔镜直肠癌根治术中的应用效果。方法:选择60岁以上择期行腹腔镜直肠癌根治术患者60例,随机分为G组和GA组,每组各30例。G组患者为单纯全麻组,GA组患者为硬膜外复合全麻组。GA组患者在诱导前取L1~2硬膜外穿刺置管,予0.5%罗哌卡因5 ml,术中每小时追加5~7 ml。两组患者诱导方法相同:即,咪哒唑仑0.04 mg/kg、舒芬太尼0.3~0.4μg/kg、顺阿曲库铵0.15~0.20 mg/kg、依托咪酯0.2~0.3 mg/kg。监测并记录患者血压(BP),心率(HR),心电图(ECG),术中全麻药用量及术后患者苏醒情况。结果:GA组患者气腹后、拔管前BP、HR明显低于G组(P<0.05),且全麻药用量明显低于G组(P<0.05)。结论:全麻复合硬膜外应用于老年腹腔镜直肠癌手术较单纯全麻用药量减少,术中循环更加稳定,是腹腔镜直肠癌根治术比较安全可行的麻醉方法。 相似文献
7.
《Vaccine》2022,40(43):6255-6270
Swine influenza A virus (swIAV) infections in pig populations cause considerable morbidity and economic losses. Frequent reverse zoonotic incursions of human IAV boost reassortment opportunities with authentic porcine and avian-like IAV in swine herds potentially enhancing zoonotic and even pre-pandemic potential. Vaccination using adjuvanted inactivated full virus vaccines is frequently used in attempting control of swIAV infections. Accelerated antigenic drift of swIAV in large swine holdings and interference of maternal antibodies with vaccine in piglets can compromise these efforts. Potentially more efficacious modified live-attenuated vaccines (MLVs) bear the risk of reversion of MLV to virulence. Here we evaluated new MLV candidates based on cold-passaged swIAV or on reassortment-incompetent bat-IAV-swIAV chimeric viruses. Serial cold-passaging of various swIAV subtypes did not yield unambiguously temperature-sensitive mutants although safety studies in mice and pigs suggested some degree of attenuation. Chimeric bat-swIAV expressing the hemagglutinin and neuraminidase of an avian-like H1N1, in contrast, proved to be safe in mice and pigs, and a single nasal inoculation induced protective immunity against homologous challenge in pigs. Reassortant-incompetent chimeric bat-swIAV vaccines could aid in reducing the amount of swIAV circulating in pig populations, thereby increasing animal welfare, limiting economic losses and lowering the risk of zoonotic swIAV transmission. 相似文献
8.
9.
目的:研究右美托咪定在宫颈癌根治术后镇痛及术后快速康复中的临床应用效果。方法:将2015年7月至2018年7月在本院行宫颈癌根治术的86例患者随机分为对照组和观察组各43例。对照组术后镇痛采用舒芬太尼和格拉司琼,观察组术后镇痛加用右美托咪定。采用视觉模拟评分法(VAS)评价患者术后1 h、6 h、12 h、24 h、48 h疼痛情况,采用Ramesay评分法评价患者不同时间点镇静状况,记录并比较两组患者不同时间点收缩压、舒张压、心率及呼吸频率变化,比较两组患者不良反应发生情况。结果:观察组患者术后6 h、12 h、24 h、48 h VAS评分均明显低于对照组(P<0.05),Ramesay评分均明显高于对照组(P<0.05);观察组和对照组患者术后不同时间点呼吸频率比较,差异无统计学意义,但术后6 h、12 h、24 h观察组患者收缩压、心率均明显低于对照组(P<0.05),术后1 h、6 h观察组患者舒张压明显低于对照组(P<0.05);观察组患者恶心呕吐、高血压发生率较对照组明显减低。结论:右美托咪定用于宫颈癌根治术后镇痛,可以提高镇痛镇静效果,稳定患者血流动力学,有助于术后快速康复。 相似文献
10.