首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   3322篇
  免费   424篇
  国内免费   178篇
耳鼻咽喉   7篇
儿科学   318篇
妇产科学   36篇
基础医学   127篇
口腔科学   13篇
临床医学   150篇
内科学   184篇
皮肤病学   25篇
神经病学   25篇
特种医学   38篇
外科学   127篇
综合类   656篇
预防医学   334篇
眼科学   59篇
药学   386篇
  1篇
中国医学   1410篇
肿瘤学   28篇
  2024年   28篇
  2023年   81篇
  2022年   165篇
  2021年   252篇
  2020年   197篇
  2019年   136篇
  2018年   129篇
  2017年   201篇
  2016年   164篇
  2015年   165篇
  2014年   317篇
  2013年   253篇
  2012年   291篇
  2011年   247篇
  2010年   206篇
  2009年   148篇
  2008年   130篇
  2007年   137篇
  2006年   96篇
  2005年   74篇
  2004年   76篇
  2003年   59篇
  2002年   33篇
  2001年   29篇
  2000年   35篇
  1999年   25篇
  1998年   25篇
  1997年   20篇
  1996年   28篇
  1995年   18篇
  1994年   20篇
  1993年   11篇
  1992年   17篇
  1991年   5篇
  1990年   12篇
  1989年   7篇
  1988年   14篇
  1987年   7篇
  1986年   11篇
  1985年   5篇
  1984年   11篇
  1983年   4篇
  1982年   10篇
  1981年   8篇
  1980年   5篇
  1979年   1篇
  1978年   2篇
  1976年   4篇
  1975年   2篇
  1974年   3篇
排序方式: 共有3924条查询结果,搜索用时 15 毫秒
1.
ObjectiveThis study used a prospective cohort study to observe the effect of triple-negative breast cancer on the 2-year disease-free survival rate with or without “TCM formula”.MethodsFrom November 1 st, 2016, the first patient was enrolled in the cohort study. A total of 356 patients were enrolled on January 30, 2019. Among them, 154 cases were followed up for 2 years. During the follow-up, there were 6 cases of shedding, so 6 cases were affected. A total of 148 cases were included in the analysis, including 73 in the exposed group and 75 in the non-exposed group. The exposed group was given “TCM formula” on the basis of standardized treatment, and the non-exposed group was treated with simple triple-negative breast cancer. The two groups visited each of the three months. The interview included safety examination (hematology and imaging). The endpoint was the difference in 2-year invasive disease-free survival between the exposed and non-exposed groups and the safety of the “TCM formula”.ResultsThere were 6 cases of shedding during the experiment and the shedding rate was 3.9 %. The 2-year rate of invasive disease-free survival in the exposed team was 88.7 % and the non-exposed group was 82.5 %. Logistic multivariate regression analysis predicted that “TCM formula” could reduce the disease-related recurrence and metastasis rate by 11 % (OR = 0.89, 95 % CI 0.37−0.956, P<0.05). Through K–M survival analysis, TNBC patients with age ≤35 years and regional lymph node stage N1 may be the benefit group of “TCM formula”(P<0.05). During the study, the incidence of total adverse events was 8.2 % in the exposed group, mainly manifested as stomach discomfort, diarrhea, and hepatocyte damage.Conclusion1. In the exposed group, the two-year rate of invasive disease-free survival increased by 6.2 % compared with the non-exposed group(P>0.05). 2. According to K–M survival analysis, TNBC patients with age ≤35 years and regional lymph node metastasis to N1 may be potential beneficiaries of “TCM formula”. 3. “TCM Formula” is safe and tolerable to most patients.  相似文献   
2.
中药复方是由2味或2味以上中药遵循中医理论组合而成的方剂。多味中药在合适的剂量配比之下,协同发挥作用,实现中医的整体调节治疗。研究中药复方的配伍对推动中药现代化发展、新药开发以及临床应用有着重要意义。近年来,研究者们在传统的"七情和合"与"君臣佐使"的基础上,运用新技术和新方法对中药复方的成分、药效活性和药代动力学性质等进行了研究,从不同角度探讨了中药复方配伍的科学内涵。同时,多种数理方法和模型的建立、网络药理学和数据挖掘方法的发展与应用,也对中药复方配伍研究提供了很大帮助。研究方法的发展虽促进了中药复方配伍的科学研究,但还需进一步建立适合中药复方配伍复杂关系的研究方法,以阐明中药复方及其成分/组分配伍的内在规律,进而构建新的现代中药复方,这也是目前中药复方配伍研究的重点任务。  相似文献   
3.
王真富 《河北医学》2002,8(2):119-121
目的:解释血压在毛细血管前阻力血管中下降最快的原因。方法:利用物理模型简化复杂的心血管系统。结果:全身所有的微、小动脉段“并联”,全身所有的毛细血管段“并联”。结论:微、小动脉段的总流阻最大、使俐血压在微、小动脉中下降最快。  相似文献   
4.
采用聚乙烯硫酸(PVS)沉淀法测定血清低密度脂蛋白胆固醇(LDL-C)值,同时应用Friedewald公式计算LDL-C含量,并对两法结果进行比较分析,提出当甘油三脂(TG)<4.52mmol/L时,F公式计算法可代替PVS法,当TG>4.52mmol/L时,不宜用F公式计算LDL-C的值。  相似文献   
5.
Crossed radioimmunoelectrophoresis (CRIE) was used to study the presence of serum IgE against antigenic components of cow milk in 21 selected milk-allergic patients. The amount of each IgE specificity was estimated by a scoring system. The milk-allergic children had mainly IgE against alpha-lactalbumin, beta-lactoglobulin, albumin and immunoglobulin, the four major proteins of bovine whey, as well as IgE against three casein components. A serum pool from 1000 normal adults had IgE against the same whey protein, but in smaller amounts, and no IgE against the casein components. Eight cow milk-based formulae, commonly used for infant feeding, and goat milk were studied by the same method. It was found that six of the milk substitutes did not differ significantly from cow milk in antibody binding, but the two hydrolysed casein products, Nutramigen and Pregestimil, consisted of such small molecules that the rabbit antisera could not precipitate the hydrolysed proteins in the gels on the CRIE plates. It was therefore not possible to study their IgE binding, if any, by this method.  相似文献   
6.
QuantitativerelationshipbetweenpupillaryreflexfeatureanditsdiopterinretinoscopyXuShang(徐上);JiShangnian(计尚年)(DepartmentofOphth...  相似文献   
7.
目的 观察早期饮食干预对婴幼儿呼吸道变态反应疾病发展的影响。方法 选取2003年1月-2004年6月复旦大学附属儿科医院0~6月变态反应疾病高危婴儿176例,在进行环境控制的前提下,随机分为干预组(饮食干预)和非干预组,随访两组患儿变态反应疾病发生、发展的情况。结果 (1)在干预6、12、18个月后,干预组发生两种以上变态反应疾病的人数均显著少于非干预组,过敏症状的严重程度较非干预组也显著减轻(P〈0.005)。(2)饮食干预18个月后,两组患儿在吸入性过敏原筛查阳性比例上的差异没有显著性(χ^2=0.002,P=0.969),但干预组患儿的肺功能显著优于非干预组(P〈0.005)、干预组的食物过敏原筛查阳性比例显著低于非干预组(χ^2=8.91,P〈0.01)。结论 对变态反应性疾病高危婴儿进行饮食干预,能减轻或消除呼吸道变态反应疾病症状,改善肺功能。  相似文献   
8.
A. Høst  E.-G. Samuelsson 《Allergy》1988,43(2):113-118
Five children aged 12-40 months with IgE-mediated adverse reactions to cow milk (immediate onset clinical pattern of cow milk allergy) were orally challenged double-blind in random order with three different milk preparations processed from the same batch of milk 1) raw untreated cow milk, 2) pasteurized cow milk, 3) homogenized and pasteurized cow milk, and 4) Nutramigen (a commercial hypoallergenic infant formula based on hydrolysed casein) as placebo. Skin prick tests with the same preparations were also performed. On oral challenge the three different processed milk types provoked significant and similar allergic reactions in each child, and no adverse reactions followed the challenge with placebo (Nutramigen). Skin prick test with the same milk products were positive in all children and comparable to the results with an extract of purified raw cow milk protein (Soluprick), whereas Nutramigen did not elicit any skin reactions. A tendency towards a lower threshold of reaction and larger skin reactions induced by the processed milk preparations might indicate an increased ability of pasteurized and homogenized/pasteurized milk to evoke allergic reactions in patients allergic to milk.  相似文献   
9.
In early infancy, complex disorders of acid base metabolism are more frequent than in any other age group, with a predisposition to metabolic acidosis due to an age-related low renal capacity for acid excretion and an unphysiologically high actual renal acid load in nutrition with common formulas. Recently in preterm and small-for-gestational-age infants, persistent maximum renal net acid excretion (NAE) with subnormal or normal blood acid base status, impaired weight gain, and adaptive hormonal reactions have been observed. Incipient late metabolic acidosis is one example of a mixed disorder of acid base metabolism with maximum renal NAE in early infancy. Alkali therapy is highly effective and can be realized both on an individual basis, using urine pH screening as a diagnostic criterium for maximum renal acid stimulation, or on a general preventive level using modified standard formula with a reduced actual renal NAE similar to that seen on alimentation with human milk. From an integrated point of view, the low glomerular filtration rate and renal capacity for acid excretion beyond the developmental age of more than 44 weeks, may well be interpreted as the result of a specific adaptation to breast feeding sparing energy, and thus an evolutionary advantage for the survival of mother and child. Received July 10, 1996; received in revised form and accepted October 7, 1996  相似文献   
10.
β-Lactoglobulin was isolated from infant formulae that were ultra high temperature (UHT) -treated, sterilized or spray-dried. The effect of the isolated β-lactoglobulin on SfaII-fimbriae-mediated adhesion of Escherichia coli to human ileostomy glycoproteins was studied in vitro. β-Lactoglobulin isolated from sterilized formulae was found to perform significantly less well than preparations from spray-dried formulae (p = 0:05). Great heterogeneity was observed in the adhesion inhibitory capacity of β-lactoglobulin isolated from UHT-treated formulae. Therefore, no significant difference was observed between UHT-treated and sterilized formulae or spray-dried formulae (p < 0:10). It can be hypothesized that β-lactoglobulin from spray-dried and some UHT-treated infant formulae may affect the colonization of mucous membranes by E. coli strains causing neonatal septicaemia and meningitis.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号