全文获取类型
收费全文 | 229399篇 |
免费 | 19063篇 |
国内免费 | 4973篇 |
专业分类
耳鼻咽喉 | 3432篇 |
儿科学 | 4171篇 |
妇产科学 | 3836篇 |
基础医学 | 19501篇 |
口腔科学 | 7820篇 |
临床医学 | 20415篇 |
内科学 | 21542篇 |
皮肤病学 | 2590篇 |
神经病学 | 11342篇 |
特种医学 | 5936篇 |
外国民族医学 | 16篇 |
外科学 | 21906篇 |
综合类 | 36212篇 |
现状与发展 | 12篇 |
一般理论 | 30篇 |
预防医学 | 29382篇 |
眼科学 | 2207篇 |
药学 | 21236篇 |
367篇 | |
中国医学 | 28819篇 |
肿瘤学 | 12663篇 |
出版年
2024年 | 3834篇 |
2023年 | 5607篇 |
2022年 | 9042篇 |
2021年 | 11612篇 |
2020年 | 11389篇 |
2019年 | 12701篇 |
2018年 | 10904篇 |
2017年 | 9570篇 |
2016年 | 8460篇 |
2015年 | 8062篇 |
2014年 | 14936篇 |
2013年 | 15252篇 |
2012年 | 13366篇 |
2011年 | 14221篇 |
2010年 | 11470篇 |
2009年 | 9984篇 |
2008年 | 9249篇 |
2007年 | 9245篇 |
2006年 | 7863篇 |
2005年 | 6652篇 |
2004年 | 5581篇 |
2003年 | 4946篇 |
2002年 | 3837篇 |
2001年 | 3182篇 |
2000年 | 2806篇 |
1999年 | 2321篇 |
1998年 | 1886篇 |
1997年 | 1679篇 |
1996年 | 1387篇 |
1995年 | 1304篇 |
1994年 | 1192篇 |
1993年 | 1051篇 |
1992年 | 926篇 |
1991年 | 868篇 |
1990年 | 749篇 |
1989年 | 709篇 |
1988年 | 660篇 |
1987年 | 602篇 |
1986年 | 556篇 |
1985年 | 1823篇 |
1984年 | 2084篇 |
1983年 | 1305篇 |
1982年 | 1733篇 |
1981年 | 1209篇 |
1980年 | 1031篇 |
1979年 | 929篇 |
1978年 | 754篇 |
1977年 | 563篇 |
1976年 | 699篇 |
1975年 | 485篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
111.
目的:观察健脾益肾颗粒联合替米沙坦对代谢综合征(metabolism syndrome,MS)患者肝肾功能及血管内皮功能的影响。方法:选取2012年8月—2015年1月在本院接受治疗的MS患者158例,随机分成对照组和观察组,每组79例。对照组给予替米沙坦治疗,观察组在对照组治疗的基础上加用健脾益肾颗粒治疗。观察治疗前后两组患者肝肾功能、血管内皮功能的变化情况。结果:治疗后,两组ALT、AST、BUN、Cr水平比较,差异无统计学意义(P0.05);治疗后,观察组NO、SOD、FMD、ET-1水平均优于对照组,差异具有统计学意义(P0.05)。结论:健脾益肾颗粒联合替米沙坦可显著改善MS患者血管内皮功能,且不会对肝肾功能造成影响。 相似文献
112.
目的:观察不同浓度补肾健脾方含药血清对原代培养的卵巢颗粒细胞增殖作用的影响以及不同浓度补肾健脾方对小鼠卵巢组织卵泡颗粒细胞层增殖的影响。方法:采用机械分离法结合胰蛋白酶消化法体外原代培养大鼠卵巢颗粒细胞,通过HE染色法进行细胞形态鉴定。采用MTT法检测,分别观察含质量分数5%、10%、20%补肾健脾方含药血清对卵巢颗粒细胞增殖作用的影响。体内实验通过给雌性小鼠灌胃不同浓度的补肾健脾方,连续灌胃4周,取卵巢组织做病理形态学观察。结果:质量分数20%、10%、5%的补肾健脾方含药血清对大鼠卵巢颗粒细胞增殖作用各不相同,质量分数20%、10%的含药血清、20%的空白血清对卵巢颗粒细胞的增殖作用最明显,与正常组比较,差异具有统计学意义(P0.05)。补肾健脾方大剂量、中剂量、小剂量对卵巢卵泡颗粒细胞层的厚度呈现一定的增高趋势。结论:补肾健脾方对小鼠的卵巢颗粒细胞具有一定的增殖作用。 相似文献
113.
近年来人们对干眼症的关注与日俱增,中医药发挥其传统优势,运用内治,外治,针灸等方法,达到机体脏腑功能平衡,气血津液充足,化生泪液有源,泪液不乏。但是,目前中医学对于干眼症的研究还存在一些问题。第一,干眼的疗效评价标准参照西医学标准,中医方面尚无统一标准。第二,干眼症的中医辨证分型也无统一标准,数据可信度难以保证。第三,临床的研究设计多为小样本,科研设计不够严谨,缺乏相关的动物实验研究。干眼症是多种原因诱发的疾病,已经逐步引起人们的重视,但就其发病的病因及机制应更进一步的深入研究。治疗上应在中医整体观念的指导下,运用辨证施治同时结合现代医学理论。应统一干眼症的辨证分型及疗效评价标准,增加临床观察指标的客观性及可信度,同时临床学者及科研工作者应尝试采取大样本,多中心的随机对照实验,让研究结果更有说服力,也应该尝试更多的动物实验研究,运用先进的科学技术及方法研究本病的病理生理状况,预防等,将其结果转化为临床可用的知识,为干眼症的诊疗开辟新的篇章。 相似文献
114.
115.
目的:观察经皮椎体后凸成形术(PKP)与"五点式"支撑复位综合疗法治疗新鲜骨质疏松性胸腰椎压缩骨折(OVCFs)在缓解疼痛、矫正脊柱后凸畸形、改善患者生活质量及邻近再骨折发生率、骨密度改善等方面的效果。方法:回顾性分析OVCFs患者74例,其中37例行PKP手术治疗(A组),37例行"五点式"支撑复位综合疗法治疗(B组),术后常规拍摄伤椎及其邻近阶段X线片,行骨密度检查,2组治疗后6、12、24个月进行随访,记录患者疼痛视觉模拟评分(VAS)、伤椎前缘高度、后凸Cobb角、Oswesty功能障碍指数(ODI)、邻近再骨折发生率、骨密度改善情况。结果:A组伤椎前缘高度恢复、后凸畸形矫正、疼痛缓解及功能活动、骨密度改善等方面均优于B组,差异有统计学意义(P0.05)。A组与B组邻近节段发生骨折率分别为8.1%和18.9%,差异有统计学意义(P0.05)。结论:PKP能使OVCFs患者的腰背疼痛得到有效缓解,能矫正后凸畸形,改善患者生活质量,降低邻近阶段骨折的再发生。 相似文献
116.
Objective
To compare the clinical efficacy between electroacupuncture combined with heat-sensitive moxibustion and western medicine for treatment of premature ovarian failure.Methods
Eighty patients were randomly divided into an electroacupuncture combined with heat-sensitive moxibustion group (group A, n=40) and a western medicine group (group B, n=40). Zîgōng (Results
The cured and markedly effective rate of group A was 72.5% (29/40), which was superior to that of group B (37.5%, 15/40) (P<0.05). The symptom scores were improved significantly in the two groups after treatment (all P<0.05), and the improvement in group A was superior to that in group B (all P<0.05).Conclusion
The efficacy of electroacupuncture combined with heat-sensitive moxibustion is superior to that of conventional western medicine in treatment of premature ovarian failure. 相似文献117.
M.C.P.M. da Cunha M. Weber F.C. Nart 《Journal of electroanalytical chemistry (Lausanne, Switzerland)》1996,414(2):163-170
The adsorption of nitrate ions on gold and platinum electrodes in acid solution has been studied in acidic solution using in situ FURS. It is found that nitrate is adsorbed probably with a two-fold coordination on gold electrodes as suggested by the adsórbate potential-dependent spectral feature centered between 1440 and 1460 cm?1. In addition, partial reduction of the nitrate ions at more negative potentials (ca. 0.05 V) generates nitrite ions in solution. These ions are co-adsorbed with nitrate ions in the double layer region of potentials. The nitrite ions seem to be adsorbed O-down with a one-fold or two-fold coordination. Platinum electrodes are found to be much more active catalytically to nitrate reduction than gold electrodes. The reduction of nitrate ions at potentials below 0.8 V generates an adsorbed product presenting a potential-dependent band at 1540 to 1580 cm?1 which has been identified as adsorbed NO. 相似文献
118.
S. Anil MDS V. T. Beena MDS † Ravindran Ankathil MSc PhD ‡ P. Remani MSc PhD § T. Vijayakumar MSc PhD ¶ 《Australian dental journal》1995,40(1):39-42
A case of mandibulofacial dysostosis (Treacher Collins syndrome) is presented. Clinical features and skull radiographs revealed typical anomalies associated with the syndrome. Cleft of the soft palate and unerupted multiple supernumerary teeth were present in this case. No haematological, biochemical or immunological abnormalities could be detected in the patient. Pedigree analysis showed an autosomal dominant mode of transmission of the disease. Chromosomal studies did not reveal any structural or numerical discrepancies. 相似文献
119.
BACKGROUND: Bad breath has a significant impact on our daily social life to those who suffer from it. The majority of bad breath originates within the oral cavity. However, it is also possible that it can come from other sources such as gastric-intestine imbalance. The term "oral malodor" is used to describe a foul or offensive odor emanating from the oral cavity, in which proteolysis, metabolic products of the desquamating cell, and bacterial putrefaction are involved. Recent evidence has demonstrated a link between oral malodor and adult periodontitis. The process of developing bad breath is similar to that noted in the progression of gingivitis/periodontitis. Oral malodor is mainly attributed to volatile sulfur compounds (VSC) such as hydrogen sulfide, methyl mercaptan and dimethyl sulfide. The primary causative microbes are gram-negative, anaerobic bacteria that are similar to the bacteria causing periodontitis. These bacteria produce the VSC by metabolizing different cells/tissues (i.e., epithelial cells, leukocytes, etc.) located in saliva, dental plaque, and gingival crevicular fluid. Tongue surface is composed of blood components, nutrients, large amounts of desquamated epithelial cells and bacteria, suggesting that it has the proteolytic and putrefactive capacity to produce VSC. One of the challenges in dealing with oral malodor is to identify a reliable test for detecting bad breath. AIMS: The purposes of this review article were: (1) to correlate the relationship between oral malodor and adult periodontitis; (2) to analyze current malodor tests and discuss available treatment regimens. 相似文献
120.
OBJECTIVES: In order to determine the active sites for salivation of various tachykinins, the regulatory roles of the N-terminal portion of various newly-synthesized tachykinins were studied after i.p. injection of rats using the submandibular glands as model organs. METHODS: N-shortened oligopeptides from kassinin, eledoisin, neurokinins A (NKA) and NKB were synthesized by the multipin peptide synthesis method. Amino acids were eliminated one by one to form octa- to undeca-peptides adjoining the inactive or less active heptapeptides and various heptapeptides, in which an amino acid in position 8 (Xaa8), numbering as in an undecapeptide, was replaced with Tyr, Phe, Ile or Val. RESULTS: The N-terminal amino acids in positions 1 to 4 could be activators or inhibitors, depending on whether the C-terminal heptapeptide was inactive or less active. The Xaa8 residue, in combination with amino acids in positions 5 and 6, seemed to be very important in determining the sialogogic activity of a heptapeptide. The discrimination between NKA and NKB appeared due to the N-terminal amino acid sequence in positions I to 4 including Phe or Ser in position 6. CONCLUSIONS: It is concluded that the N-terminal amino acids in positions I to 4 serve as either activators or inhibitors depending upon the sialogogic activity of the C-terminal heptapeptide, in which particular amino acids in positions 5, 6 and 8 regulate its activity. 相似文献