抑菌促生长的饲料添加剂--那西肽

那西肽是符合当前人们对饲料添加剂要求的含硫环状多肽类抗生素，不但能促进畜禽生长，提高饲料效率，而且无残留，对环境影响极小，对人畜安全，是一种比较理想的饲用抗生素的替代品。本文对那西肽的理化性质、生物学作用以及在动物生产中的应用效果及其使用的安全性进行了全面阐述。     

培养料中重金属元素对杏鲍菇子实体产量和质量的影响

工厂化栽培过程中,培养料中添加不同浓度的As、Hg、Pb和Cd,研究这些元素对杏鲍菇子实体产量的影响和在子实体中的累积规律.结果表明,子实体中As、Hg、Pb和Cd的含量随其在培养料中浓度的增加而增加,而且As、Hg和Cd会显著降低生物学效率.根据GB 7096-2003和NY/T 749-2003中食用菌干品的重金属限量要求,建议杏鲍菇培养料中As、Hg、Pb和Cd的浓度应分别低于0.5、1.0、3.5和1.0 mg/kg.     

车辆碰撞速度对安全性影响的数值模拟分析

利用有限元原理分析了汽车碰撞变形的节点位移,用变形刚度方法分析了正面碰撞的变形过程,通过分析汽车速度从48km/h提高到56 km/h与刚性墙正面碰撞的模拟车身变形结果,得出随着碰撞速度的增加,车身前端变形加大,驾驶室平均加速度也随着碰撞速度的提高而增加,当碰撞速度增加时应加强汽车车身自我保护区段的刚度,以保证乘员的安全的结论。     

人车碰撞中行人保护问题初探

汽车与行人碰撞中的行人保护问题是汽车安全性研究的一个新领域。本文介绍了国内外行人保护的研究现状和方法,对行人保护研究方法中的试验研究和计算机模拟作了详细论述,并对人体下肢的损伤机理及试验数据进行了分析,为我国今后开展行人保护工作提供参考。     

出口绿芦笋安全生产技术研究

通过对绿芦笋品种的筛选、配方肥使用以及病虫害防治等关键技术的系统应用,基本明确了能适应本地区生产、品质佳、产量高的出口绿芦笋品种及其安全生产栽培技术。出口绿芦笋安全生产标准化示范结果表明,安全生产标准化技术示范区,较常规生产对照区,出口绿芦笋的产品的商品率提高10.1%～11.6%,化肥用量减少10.87%～23.91%,农药用量减25.12%～49.28%,增加收入23811.0～40552.5元/km~2。140hm2绿芦笋取得经济效益987.5万元;出口绿芦笋安全生产示范区生产的产品中,重金属、化学农药、硝酸盐或亚硝酸盐等12种有毒有害物质残留量检测结果表明各项检测结果显著低于标准要求。     

适用于昆虫食品质量安全监测的方法及建议

昆虫从诞生之日起就是符合人类营养需求的“绿色食品”,昆虫食品的产业化生产和加工过程要严把质量关。当昆虫成为人们的常规食品时,对其生产加工的安全性检测就越发重要。昆虫食品的安全性检测可借鉴其他类食品的检测方法,监测是保证食品安全性的重要手段。     

GMOs in animal agriculture: time to consider both costs and benefits in regulatory evaluations

In 2012, genetically engineered （GE） crops were grown by 17.3 million farmers on over 170 million hectares. Over 70% of harvested GE biomass is fed to food producing animals, making them the major consumers of GE crops for the past 15 plus years. Prior to commercialization, GE crops go through an extensive regulatory evaluation. Over one hundred regulatory submissions have shown compositional equivalence, and comparable levels of safety, between GE crops and their conventional counterparts. One component of regulatory compliance is whole GE food/feed animal feeding studies. Both regulatory studies and independent peer-reviewed studies have shown that GE crops can be safely used in animal feed, and rDNA fragments have never been detected in products （e.g. milk, meat, eggs） derived from animals that consumed GE feed. Despite the fact that the scientific weight of evidence from these hundreds of studies have not revealed unique risks associated with GE feed, some groups are calling for more animal feeding studies, including long-term rodent studies and studies in target livestock species for the approval of GE crops. It is an opportune time to review the results of such studies as have been done to date to evaluate the value of the additional information obtained. Requiring long-term and target animal feeding studies would sharply increase regulatory compliance costs and prolong the regulatory process associated with the commercialization of GE crops. Such costs may impede the development of feed crops with enhanced nutritional characteristics and durability, particularly in the local varieties in small and poor developing countries. More generally it is time for regulatory evaluations to more explicitly consider both the reasonable and unique risks and benefits associated with the use of both GE plants and animals in agricultural systems, and weigh them against those associated with existing systems, and those of regulatory inaction. This would represent a shift away from a GE evaluation process that currently focuses only on risk assessment and identifying ever diminishing marginal hazards, to a regulatory approach that more objectively evaluates and communicates the likely impact of approving a new GE plant or animal on agricultural production systems.     

Research progress in reprogramming induced pluripotent stem cells

Induced pluripotent stem cells (iPSCs) have been first induced from mouse fibroblasts since 2006, and the research on iPSCs has made great progress in the following years. iPS cell lines were established from different somatic cells through DNA, RNA, protein, and small molecule compounds and various methods of transduction, making the induction of iPSCs more secure and effective, and more attractive prospect of clinical application. In this review, different somatic cell reprogramming, different levels of reprogramming, different transduction pathways, and prospect of application are discussed.     

基于WSN的农产品仓储安全监控系统研究

采用基于无线传感器网络的仓储安全监控系统是农产品仓储安全监控系统未来的发展方向之一.其一方面能够进一步实现国家对农产品仓储业现代化、高效化、个性化、精细化的要求,另一方面还能够拓展无线传感器网络的市场应用需求,最终达到双赢的目的.首先总结了仓储安全监控系统的意义和业务,然后分析了Wi-Fi技术用于农产品仓储安全监控系统的3点优势,最后给出了农产品仓储安全监控系统架构并详细描述了架构中无线传感器网络节点的构成及功能.该系统最终能够实现农产品仓储环境监控和农产品仓储作业设备监控的功能,并对农产品仓储作业设备维护管理提供信息依据.     

对外直接投资与我国粮食安全保障体系的构建

粮食安全关系到一国的国计民生。在全球化的今天,在确保粮食国内供给为主的同时,我国也要利用国外的资源作为我国粮食安全保障的辅助措施。该研究通过对我国现有酌粮食耍全傈障体系的分析,发现我国粮食安全保障体系有待完善。因此,在对我国农业对外直接投资的发展及其布局进行研究的基础上,从国内保障和国外保障两方面对我国粮食安全保障体系进行了重构。