基于SPOC的微生物学混合式教学探索与实践

主要探索基于SPOC的微生物学混合式教学方法与途径,通过重塑课程教学目标、调整专业教师队伍、搭建线上教学环境、优化混合式教学设计、改进线下教学方法、完善教学评价模式,较好地实现了"以学生为中心"的教学变革,取得了良好的教学效果.     

案例教学在篮球课中的应用研究

为了探索更为有效的教学方法,本文运用文献资料法、教学实验法、问卷调查法和数理统计法等多种研究方法,分析案例教学在体育院系篮球专项课战术教学中的运用规律,测试案例教学法的可行性和教学效果。     

高职体育教学多样化教学方法在课堂中应用的探讨

随着体育教育改革思想的不断深入,对高职院校的体育教学方法提出了更高的要求,高职体育教师的教学方法应该变得多元化,以便提高教学效果和质量,顺应新一轮的教学改革。教师应改变原有的教学模式,利用多种方法激发学生的体育学习兴趣。本文在阐述了高职院校体育教学现状的基础上,分析列举了体育游戏、赏识教育及合理利用多媒体在体育教学中的作用,为提高教学质量提供参考和借鉴。     

浅谈高职院校美术专业的素描教学

高职院校的素描教学作为美术专业教学中的重要内容,对学生绘画艺术水平的提高,具有重要的基础性作用。搞好素描教学,教师要注重调动学生的素描学习兴趣,开展学习方法的指导,运用多种教学方法,达到提高素描教学效果的目的。     

浮法玻璃生产技术与设备教学方法研究

分析洛阳理工学院浮法玻璃生产技术与设备课程的教学现状,根据学生们的教学反馈,采用以理论联系实际为基础,多种教学方法相结合的教学手段和以学生为主体、教师为主导的教学模式,突出学生在教学过程中的主观能动性的作用,注重学生能力的培养,达到优化教学效果、提高教学质量、培养应用型人才的目标。     

《食品机械与设备》教学方法改革的探索与实践

根据长期《食品机械与设备》课程的教学研究及实践,发现教学中存在不足,影响该课程的教学效果;本文提出着重从改革前导课程教学、激发学生的兴趣、丰富教学内容、加强与改革实践教学环节、培养学生的自学能力、改革教学方法手段等六个方面分析了改革《食品机械与设备》教学方法的心得.     

高职《进出口报关实务》课程教学改革探究——基于区域经济发展视角

《进出口报关实务》是国际物流、报关与货运等专业的核心课程,涉及面非常广,具有很强的操作性。文章认为应根据区域经济特点及岗位需求设计、组织教学内容,利用情景导入、角色模拟、实物教学、开展报关技能竞赛等多种教学方法及手段来改革教学以提高教学效果。     

无机及分析化学教学方法探索

介绍了无机及分析化学的教学现状以及提高无机及分析化学教学效果的一些方法,阐述了在教学实践中为提高教学效果所采取的一系列措施,主要内容包括激发学习兴趣、精心组织教学内容、采用合适的教学手段、改革实验教学等。多年来综合运用这些教学方法,取得了良好的教学效果。     

CAD制图教学方法探索

以工科院校CAD制图教学的教学思路、教学方法、教学效果及教学中注意的一些问题进行了分析和探讨。     

轻化工程专业《助剂化学》课程的教学改革与实践

针对轻化工程专业的特点,在充分考虑专业实际和教学要求的基础上,着重对教学内容、教学手段和教学方法进行改革和实践,重点阐述教学改革的关键性问题,通过增加《助剂化学》导课方法、引进对比教学法、补充学科前沿知识,灵活布置作业等多种教学方法和手段实现教学质量的提高,有效解决该课程教学任务重、时间短的矛盾。实践表明,教学改革有效提高了学生的学习兴趣,提升了教学质量,学生就业后能快速融入企业,取得了明显的教学效果。     

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