全文获取类型
收费全文 | 3912篇 |
免费 | 246篇 |
国内免费 | 34篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 1094篇 |
妇产科学 | 142篇 |
基础医学 | 536篇 |
口腔科学 | 62篇 |
临床医学 | 198篇 |
内科学 | 195篇 |
皮肤病学 | 22篇 |
神经病学 | 42篇 |
特种医学 | 58篇 |
外科学 | 109篇 |
综合类 | 234篇 |
预防医学 | 1068篇 |
眼科学 | 4篇 |
药学 | 317篇 |
3篇 | |
中国医学 | 61篇 |
肿瘤学 | 46篇 |
出版年
2024年 | 5篇 |
2023年 | 45篇 |
2022年 | 198篇 |
2021年 | 276篇 |
2020年 | 149篇 |
2019年 | 131篇 |
2018年 | 129篇 |
2017年 | 129篇 |
2016年 | 145篇 |
2015年 | 142篇 |
2014年 | 201篇 |
2013年 | 267篇 |
2012年 | 121篇 |
2011年 | 140篇 |
2010年 | 144篇 |
2009年 | 129篇 |
2008年 | 120篇 |
2007年 | 130篇 |
2006年 | 107篇 |
2005年 | 108篇 |
2004年 | 111篇 |
2003年 | 89篇 |
2002年 | 82篇 |
2001年 | 63篇 |
2000年 | 62篇 |
1999年 | 64篇 |
1998年 | 53篇 |
1997年 | 58篇 |
1996年 | 57篇 |
1995年 | 47篇 |
1994年 | 71篇 |
1993年 | 43篇 |
1992年 | 43篇 |
1991年 | 34篇 |
1990年 | 35篇 |
1989年 | 36篇 |
1988年 | 39篇 |
1987年 | 38篇 |
1986年 | 44篇 |
1985年 | 34篇 |
1984年 | 44篇 |
1983年 | 39篇 |
1982年 | 58篇 |
1981年 | 33篇 |
1980年 | 21篇 |
1979年 | 23篇 |
1978年 | 17篇 |
1977年 | 12篇 |
1976年 | 8篇 |
1975年 | 6篇 |
排序方式: 共有4192条查询结果,搜索用时 15 毫秒
1.
2.
3.
《Allergologia et immunopathologia》2019,47(4):322-327
BackgroundChildren with IgE-mediated cow's milk allergy (IgE-CMA) with gastrointestinal symptoms tolerate yogurt at 100%. Yogurt tolerance in children with IgE-CMA with urticaria and anaphylaxis was 7%.MethodsWe enrolled children with IgE-CMA with cutaneous, respiratory, gastrointestinal and anaphylactic symptoms. All performed prick by prick (PbP) and oral food challenge (OFC) with yogurt. Some children performed also an OFC with CM mixed with wheat flour and baked, baked liquid CM, parmesan.Results34 children were enrolled, 31/34 (91%) with systemic adverse reaction after ingestion of CM (systemic CMA), 3/34 (9%) with isolated contact urticaria (ICU CMA). PbP with yogurt was negative only in one patient. OFC with yogurt was passed (that is, the OFC was negative) by 20/31 (64%) of the children with systemic CMA. 10/11 (91%) of the patients who failed OFC (that is, the OFC was positive) with yogurt were positive to SPT with casein vs. 8/20 (40%) of the patients who passed it (p = 0.018). None of the 19 children who passed OFC with yogurt failed all OFC with processed CM forms other than yogurt that tested vs. 4/8 among those who failed OFC with yogurt (p = 0.006). The rub test with yogurt was negative in 1/3 (33%) of the patients with ICU CMA.ConclusionsThe results of our study are placed alongside others already present in the literature and concerning other methods of processing CM proteins and help to reduce the dietary restrictions of the majority of children with systemic IgE-CMA. 相似文献
4.
5.
《Revista de gastroenterologia de Mexico》2019,84(3):357-371
Milk is a liquid food that possesses an important quantity of highly bioavailable macronutrients. In addition, it is readily accessible, as well as relatively inexpensive. Given that the knowledge of physicians about nutrition and food composition is deficient, in general, many of the dietary interventions recommended in diverse clinical settings lack a scientific basis. The aim of the present review was to produce a technical opinion that serves as a frame of reference to best sustain recommendations for consuming milk and dairy products as daily nutrition in the adult and older adult. The effects of milk and dairy products during the pediatric stage are not addressed in the present work. The Asociación Mexicana de Gastroenterología and the Asociación Mexicana de Gerontología y Geriatría jointly discussed and analyzed topics dealing with the legal designation of milk, the classification and nutritional profile of cow's milk, its nutritional characteristics, its consumption in the adult, intolerance to cow's milk, and associations of milk consumption with digestive tract alterations and other conditions. Finally, certain aspects of milk consumption in the older adult and its relation to overall health are briefly discussed. 相似文献
6.
目的:推广适应儿童的非创伤性充填技术(ART)总结应用ART治疗乳磨牙龋病的临床效果。 方法 于2001年选取112名6岁-8岁儿童 225颗乳磨牙 采用ART技术 跟踪随访1年。 结果 成功195颗 失败30颗 成功率86 8%。结论 ART技术是一项只用手工器械去除龋坏组织 并用粘结性修复材料修复 龋洞的治疗技术 对儿童乳磨牙龋病早期治疗有实用价值 并有利于开展群防群治。 相似文献
7.
Ingrid Gouldsborough Nick Ashton 《Clinical and experimental pharmacology & physiology》1998,25(12):1024-1031
1. The aim of the present study was to compare electrolyte handling in naturally reared neonatal spontaneously hypertensive rats (SHR) with those reared by a Wistar-Kyoto (WKY) rat foster mother (denoted SHRX), as cross-fostering SHR pups to a WKY rat dam lowers adult blood pressure in the SHR. 2. The electrolyte content of WKY rat and SHR dams’ milk was determined and electrolyte intake and urinary excretion rates were calculated in both naturally reared and cross-fostered WKY rat and SHR pups. 3. The milk sodium concentration fell in both strains (WKY rat: 31.8 ± 2.0 to 15.2 ± 1.2 mmol/L; SHR 31.9 ± 2.5 to 18.2 ± 1.6 mmol/L; P < 0.001), as did potassium (P < 0.001), over lactation, but there were no differences between strains. Calcium and magnesium concentrations increased (P< 0.001), although SHR dam's milk contained less calcium (P < 0.001) than that of WKY rat dams during the third week of lactation. 4. Spontaneously hypertensive rat pups ingested less milk (P<0.05) than WKY rat pups; therefore, their cumulative sodium intake over postnatal days 4–15 was significantly lower than that of WKY rat pups (WKY rat vs SHR: 84.4 ± 3.6 vs 59.7 ± 2.6 μmol/g bodyweight, respectively; P < 0.05) and fostered SHRX pups (77.7 ± 7.0 μmol/g bodyweight; P < 0.05). Potassium and magnesium intakes were comparable between SHR, WKY rat and SHRX pups, but SHR pups ingested significantly less calcium than either WKY rat pups (136.1 ± 6.4 vs 200.1 ± 9.5p, mol/g bodyweight, respectively; P<0.05) or SHRX pups (200.0 ± 18.0 μmol/g bodyweight; P<0.05). 5. These data show that the neonatal SHR experiences a period of sodium deficiency during the developmental stage when cross-fostering is effective in lowering blood pressure. This is consistent with the reported up-regulation of the renin-angiotensin system observed in SHR at this time and may have a long-term influence on blood pressure. 相似文献
8.
强化婴幼儿奶粉中叶酸的测定 总被引:1,自引:0,他引:1
强化叶酸的奶粉在0.05M K_2HPO_4缓冲液中,经均质,调pH4.5,15000g离心20分钟,其清液调pH4.0,进行CGS树脂离子交换层析,用10ml KClK_2HPO_4洗脱,调pH7.0,进行HPLC测定,采用300x3.9mm ODS反相柱,移动相0.05M K_2HPO+MeOH(91+9),流速1ml/分,紫外检测器波长285nm,灵敏度0.0050D。方法相对标准偏差为±3.3%,回收率为87%,最小检测量为0.02μg/ml。 相似文献
9.
<正> 至今有关母乳中胃肠激素研究较少,国内未见报道。我们应用放射免疫法测定了45例正常产妇血及乳汁中胃动素和胃泌素浓度,以期为普及母乳喂养提供新依据。 1 材料和方法 1.1 研究对象 1992年4~7月,选我院单胎妊娠自然分娩的产妇45例,平均25.51岁(22~28岁);胎龄39.60周(36~41周);产程12.35小时(5.20~17.35小时);平均出血量0.17L(0.08~0.35L); 相似文献
10.