2010-2019年内蒙古自治区汉族大学生运动能力发展趋势研究

本研究通过对2010-2019年9年间内蒙古自治区汉族大学生运功能力指标的变化趋势进行纵向比较和不同年度各指标不及格率的横向变化趋势分析,探索内蒙古自治区汉族大学生运动能力发展趋势。结果表明：（1）9年间内蒙古自治区汉族大学生爆发力和耐力水平总体呈下降趋势,速度能力各组别男生和21-22岁女生的成绩呈下降趋势,柔韧性水平男生成绩呈现下降、女生成绩呈现提高趋势,力量水平男生成绩呈下降、19-20岁女生成绩呈提高、21-22岁女生成绩呈现持平趋势;（2）9年间除爆发力（2019年）和柔韧性（2014年）外,内蒙古自治区汉族大学生各项运动指标均表现为21-22岁年龄组不及格率高于19-20岁年龄组;（3）9年间除力量和柔韧性外,内蒙古自治区汉族大学生各项运动指标均为女生不及格率高于男生;（4）9年间均表现为力量和耐力水平不及格率高居不下,且有继续上升的趋势。     

抗食物过敏的天然活性物质研究进展

近年来食物过敏的发病率持续增高,严重影响了人们的生活质量。与化学药物相比,天然来源的抗食物过敏活性物质具有作用缓和、副作用小、安全等特点。目前报道的抗食物过敏天然活性物质主要来源于益生菌、陆生植物和海藻等。本文概述了食物过敏及其免疫学机理,抗食物过敏评价模型,抗食物过敏天然活性物质及其作用机制,分析了抗食物过敏天然活性物质的发展趋势。     

抗食物过敏的天然活性物质研究进展

近年来食物过敏的发病率持续增高,严重影响了人们的生活质量。与化学药物相比,天然来源的抗食物过敏活性物质具有作用缓和、副作用小、安全等特点。目前报道的抗食物过敏天然活性物质主要来源于益生菌、陆生植物和海藻等。本文概述了食物过敏及其免疫学机理,抗食物过敏评价模型,抗食物过敏天然活性物质及其作用机制,分析了抗食物过敏天然活性物质的发展趋势。     

大学生自诉食物过敏及其家族聚集性调查

目的 分析大学生自诉食物过敏家族聚集性,为食物过敏防治与管理工作提供理论依据.方法 2019年采用多阶段整群随机抽样方法调查南昌市2538名大学生,调查内容包括研究对象的食物过敏状况、主要影响因素及家族食物过敏史等,采用SPSS 17.0软件对调查数据进行统计分析.结果 回收2313份有效问卷,大学生自诉食物过敏发病率...     

国际数字出版产业发展研究述评——基于2006-2016年文献分析

选取2006-2016年间文献,对国际数字出版产业研究进行分析,揭示国际数字出版产业发展的趋势以及存在的问题与对策,以期对我国出版业的数字出版转型提供值得借鉴的宝贵经验.     

基于Citespace对我国近二十年抗阻训练研究领域的可视化分析

本文的研究对象选用2001-2021年CNKI数据库收录的295篇抗阻训练研究的核心期刊文献,以citespace5.7.R4软件来绘制出知识图谱,对我国抗阻训练研究的文献发文量、研究机构、核心作者以及研究领域等进行可视化分析.经研究结果显示:近20年抗阻训练研究文献发文量呈增长趋势,从2009年开始迎来了发文量的攀升...     

基于专利分析的我国车用发动机控制技术现状综述

文章通过专利分析的视角,对我国车用发动机控制技术发展现状进行分析。通过专利数据统计,对2012-2019年间国内车用发动机控制技术方面相关专利的梳理,从申请趋势、申请人分析、技术分类等角度分析车用发动机控制技术的宏观发展趋势,识别目前国内车用发动机控制技术的技术热点及形成原因,为我国车用发动机控制技术的未来发展提供可靠依据。     

我国体育小镇研究现状及前沿探究

近年来随着国家的重视及相关政策的颁布,各省市迎来体育小镇风潮.本文选取CNKI数据库中2010-2019年体育小镇为主题的相关文献作为统计分析的对象,探究了我国体育小镇研究的现状及前沿热点.结论:我国体育小镇目前正处于第4阶段;开展的较为普及,发文机构遍及全国;建议:北京体育大学等高校应该引领新潮,做好带头作用;体育小...     

基于CNKI数据库分析2012—2021年国内特殊医学用途配方食品研究的热点与趋势

目的：分析国内特殊医学用途配方食品研究领域的相关文献，探讨其研究热点及发展趋势。方法：检索中国知网(CNKI)数据库中2012—2021年特殊医学用途配方食品研究的相关文献，利用CiteSpace 6.1.R2软件对文献的年度发文量、作者、机构、关键词共现等数据进行可视化处理。结果：共检索获取205篇相关文献，其中年发文总量虽低，但逐年在不断增长，尤其2019—2021年间的增幅最大。作者与机构间的合作呈现出“高内聚、低耦合”的现象；具有较大影响力的作者分别为胡雯、任雪梅、田洪芸；机构分布以国家食品安全风险评估中心、食品药品检验研究院及医院为主。研究热点多围绕特医食品、展望、特殊食品、肠内营养、配方设计等；研究趋势为乳铁蛋白和多糖等。结论：2012—2021年间国内对于特殊医学用途配方食品研究的关注度逐渐在增加，但机构间的交流与合作仍需加强；其研究热点与社会问题紧密相关，并以国家政策为导向，未来研究与发展的潜力巨大。     

肠道菌群与食物过敏性疾病研究进展

食物过敏作为食品安全的热点问题在全球引起了广泛关注,食物过敏发病率的不断增加与肠道菌群结构和功能的变化密切相关。生活环境和膳食结构的改变、抗生素的使用等诸多因素都可引起肠道菌群失衡,而肠道菌群丰度和多样性的变化可导致肠道菌群与宿主免疫系统相互作用的变化,从而破坏口服耐受增加食物过敏的发病率。近年来随着肠道菌群-宿主相互作用等相关研究的不断深入,调整肠道菌群结构为过敏性疾病的防治提供了新的思路,因而益生菌在预防和治疗食物过敏中的作用开始备受关注。本文首先从细胞和分子水平总结了口服耐受和食物过敏的产生的相关机理,进一步综述了目前对于肠道菌群通过与宿主黏膜免疫系统相互作用调节食物过敏的相关机制研究,并探讨益生菌防治食物过敏的潜在机理,以期为益生菌在预防和治疗食物过敏中的应用提供理论依据。     

Reliable identification of grapevine rootstock varieties using RAPD PCR on woody samples

Since grapevine ( Vitis spp .) rootstock material is being traded increasingly as disbudded woody material a lack of distinctive morphological features on such material necessitates an alternative and reliable means of identification. Methods described here were developed for rapid and efficient extraction of DNA from woody samples rich in phenolic compounds and polysaccharides, and for subsequent identification of varieties by RAPD PCR. Using these methods, and with the application of only one selected RAPD primer, we were able to differentiate sixteen rootstock varieties, including the seven varieties most commonly used in Germany. Problems commonly encountered with reproducibility of RAPD patterns were avoided by choosing primers with a dinucleotide sequence and a high G/C content that allowed a rather high annealing temperature of 45°C. Methods described here should also be useful for other horticultural crops, especially those with woody tissues rich in phenolic compounds and polysaccharides.     

An internet compendium of analytical methods and spectroscopic information for monomers and additives used in food packaging plastics

An internet website (http://cpf.jrc.it/smt/) has been produced as a means of dissemination of methods of analysis and supporting spectroscopic information on monomers and additives used for food contact materials (principally packaging). The site which is aimed primarily at assisting food control laboratories in the European Union contains analytical information on monomers, starting substances and additives used in the manufacture of plastics materials. A searchable index is provided giving PM and CAS numbers for each of 255 substances. For each substance a data sheet gives regulatory information, chemical structures, physico-chemical information and background information on the use of the substance in particular plastics, and the food packaging applications. For monomers and starting substances (155 compounds) the infra-red and mass spectra are provided, and for additives (100 compounds); additionally proton NMR are available for about 50% of the entries. Where analytical methods have been developed for determining these substances as residual amounts in plastics or as trace amounts in food simulants these methods are also on the website. All information is provided in portable document file (PDF) format which means that high quality copies can be readily printed, using freely available Adobe Acrobat Reader software. The website will in future be maintained and up-dated by the European Commission's Joint Research Centre (JRC) as new substances are authorized for use by the European Commission (DG-ENTR formerly DGIII). Where analytical laboratories (food control or other) require reference substances these can be obtained free-ofcharge from a reference collection housed at the JRC and maintained in conjunction with this website compendium.     

Aroma characterization of various apricot varieties using headspace–solid phase microextraction combined with gas chromatography–mass spectrometry and gas chromatography–olfactometry

The characterization of the aromatic profile of several apricot cultivars with molecular tracers in order to obtain objective data concerning the aromatic quality of this fruit was undertaken using headspace–solid phase microextraction (HS–SPME). Six apricot cultivars were selected according to their organoleptic characteristics: Iranien, Orangered, Goldrich, Hargrand, Rouge du Roussillon and A4025. The aromatic intensity of these varieties measured by HS–SPME–Olfactometry were defined and classified according to the presence and the intensity of grassy, fruity and apricot like notes. In the six varieties, 23 common volatile compounds were identified by HS–SPME–GC–MS. Finally, 10 compounds, ethyl acetate, hexyl acetate, limonene, β-cyclocitral, γ-decalactone, 6-methyl-5-hepten-2-one, linalool, β-ionone, menthone and (E)-hexen-2-al were recognized by HS–SPME–GC–O as responsible of the aromatic notes involved in apricot aroma and considered as molecular tracers of apricot aromatic quality which could be utilized to discriminate apricot varieties.     

Tests of potential functional barriers for laminated multilayer food packages. Part I: Low molecular weight permeants

The advent of the functional barrier concept in food packaging has brought with it a requirement for fast tests of permeation through potential barrier materials. In such tests it would be convenient for both foodstuffs and materials below the functional barrier (sub-barrier materials) to be represented by standard simulants. By means of inverse gas chromatography, liquid paraffin spiked with appropriate permeants was considered as a potential simulant of sub-barrier materials based on polypropylene (PP) or similar polyolefins. Experiments were performed to characterize the kinetics of the permeation of low molecular weight model permeants (octene, toluene and isopropanol) from liquid paraffin, through a surrogate potential functional barrier (25 μm-thick oriented PP) into the food simulants olive oil and 3% (w/v) acetic acid. These permeation results were interpreted in terms of three permeation kinetic models regarding the solubility of a particular model permeant in the post-barrier medium (i.e. the food simulant). The results obtained justify the development and evaluation of liquid sub-barrier simulants that would allow flexible yet rigorous testing of new laminated multilayer packaging materials.     

Chlorohydrins of bisphenol A diglycidyl ether (BADGE) and of bisphenol F diglycidyl ether (BFDGE) in canned foods and ready-to-drink coffees from the Japanese market

BADGE.2HCl and BFDGE.2HCl were determined in 28 samples of ready-to-drink canned coffee and 18 samples of canned vegetables (10 corn, 5 tomatoes and 3 others), all from the Japanese market. HPLC was used as the principal analytical method and GCMS for confirmation of relevant LC fractions. BADGE.2HCl was found to be present in one canned coffee and five samples of corn, BFDGE.2HCl in four samples of canned tomatoes and in one canned corn. No sample was found which exceeded the 1mg/kg limit of the EU for the BADGE chlorohydrins. However the highest concentration was found for the sum of BFDGE.2HCl and BFDGE.HCl.H₂O at a level of 1.5mg/kg. A Beilstein test confirmed that all cans containing foods contaminated with BADGE.2HCl or BFDGE.2HCl had at lest one part coated with a PVC organosol.     

European priorities for research to support legislation in the area of food contact materials and articles

A strong science base is required to underpin the planning and decision-making process involved in determining future European community legislation on materials and articles in contact with food. Significant progress has been made in the past 5 years in European funded work in this area, with many developments contributing to a much better understanding of the migration process, and better and simpler approaches to food control. In this paper this progress is reviewed against previously identified work-areas (identified in 1994) and conclusions are reached about future requirements for R&D to support legislation on food contact materials and articles over the next 5 or so years.     

Analysis of benzo[a]pyrene in spiked fatty foods by second derivative synchronous spectrofluorimetry after microwave-assisted treatment of samples

A simple, rapid and inexpensive method has been developed for the determination of benzo[a     

The development of reference materials for paralytic shellfish poisoning toxins in lyophilized mussel. II: Certification study

This paper describes the second part of a project undertaken to develop certified mussel reference materials for paralytic shellfish poisoning toxins. In the first part two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin and decarbamoyl-saxitoxin in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the certification exercise. Fifteen laboratories participated in this certification study and were asked to measure saxitoxin and decarbamoyl-saxitoxin in rehydrated lyophilized mussel material and in a saxitoxin-enriched mussel material. The participants were allowed to use a method of their choice but with an extraction procedure to be strictly followed. The study included extra experiments to verify the detection limits for both saxitoxin and decarbamoyl-saxitoxin. Most participants (13 of 15) were able to meet all the criteria set for the certification study. Results for saxitoxin.2HCl yielded a certified mass fraction of <0.07 mg/kg in the rehydrated lyophilized mussels. Results obtained for decarbamoyl-saxitoxin.2HCl yielded a certified mass fraction of 1.59+/-0.20 mg/kg. The results for saxitoxin.2HCl in enriched blank mussel yielded a certified mass fraction of 0.48 +/- 0.06 mg/kg. These certified reference materials for paralytic shellfish poisoning toxins in lyophilized mussel material are the first available for laboratories to test their method for accuracy and performance.     

Announcing a new international peer-reviewed journal:Food Science and Human Wellness now accepting manuscript submission in English

<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of the