检索结果-南通市图书馆

中学生百科（悦青春） 2014年第4期 60-62页

作者： mamo

你走在路上，看到需要帮助的陌生人。你会伸出援助之手吗？你的回答是“当然会”？先别急，看完下面两个事件后，再给你机会回答一次。

关键词：中学生语文学习阅读知识课外阅读

Application of Neutron Activation Analysis Technique for the Analysis of Soil Samples from Farmlands of Yebrage Hawariat, East Gojjam, Ethiopia

在线全文

学校读者我要写书评

暂无评论

Journal of Agricultural Science and Technology(A) 2014年第4期4卷 342-352页

作者： Yihunie Hibstie Asres Ashok Kumar Chaubey Awoke Taddesse Hailu Dilbetigle Assefa mamo Department of Physics College of Natural and Computational Science Debre Markos University Debre Markos (+251) Ethiopia Physics Department Addis Ababa University Addis Ababa (+251) Ethiopia

Farmers may not be conscious for their farmland＇s nutrients, soil organic matter, water and air because they simply concerned only for their labor availability and soil fertility losses. The composition and proportion of these components greatly influence soil physical properties, including texture, structure and porosity, the fraction of pore space in a soil. The soil of this farmland must be able to supply adequate amount of plant nutrients, in forms which can be absorbed by the crop, within its lifespan. Deficiencies or imbalances in the supply of any of essential elements can compromise growth, affecting root development, cell division, crop quality, crop yield and resistance to disease and drought. This study was conducted to fill this knowledge gap in order to develop economically vital and environmentally accepted nutrient management strategies for the use of soils in agricultural lands. The objective of this study is to assess the elemental contents and concentration of soil samples collected from farmlands of ＂Yebrage＂ using neutron activation analysis （NAA） techniques regardless of oxidation state, chemical form or physical locations. NAA is used to determine the elemental composition and concentrations present in a soil. The macro/micronutrient and organic matter deficiencies have been verified in agricultural soils through increased use of soil testing and plant analysis. The challenge for agriculture over the coming decades will meet the world＇s increasing demands for food in a sustainable way. Current issues and future challenges point out that as long as agriculture remains a soil based industry, major decreases in productivity likely to be attained ensuring that plants do not have adequate and balanced supply of nutrients.

关键词： NAA Yebrage Chemoga macro/micronutrient organic matter soil fertility cereal cropping.

Study on distribution and characterization of Aspergillus flavus strains to screen potential biocontrol agents from different geographical locations of China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Study on distribution and characterization of Aspergillus fl...

Gene targeting and Calcium handling efficiencies in mouse embryonic stem cell lines

中国菌物学会2016年学术年会

作者： Firew Tafesse mamo Bo Shang Jonathan Nimal Selvaraj Yan Wang Yang Liu Institute of Food Science and Technology Chinese Academy of Agricultural Sciences/Key Laboratory of Agroproducts ProcessingMinistry of Agriculture

Aflatoxin contamination of crops like peanut,maize and rice is still a major public health and economic problem for the world,the impact is more significant for developing *** promising method for combating aflatoxin formation is biocontrol using competitive exclusion,currently under intensive study in peanut crops in different parts of *** *** strains as a biocontrol must be unable to produce both aflatoxin and cyclopiazonic acids and also must incapable to convert to *** the current study a total of 724 Aspergillus flavus strains isolated from peanut,maize and rice in 21 geographical locations of China were *** these,229 strains did not produce *** incidence of atoxigenic *** strains range from 28-35% from three *** productions in *** isolates were varied significantly among all sampled locations（X220,0.05= 0.012）.Non toxigenic（non AFB1 and CPA） strains were screened for their potential as biocontrol by examining the 28 aflatoxin biosynthesis genes,using a PCR *** which do not have afl R PCR products were selected for analysis of the other 27 biosynthetic *** four strains showed failure,in the,fas-2 and afl J genes,***（67%） of atoxigenic *** strains failed to show a PCR product in 10 or more ***,18 PCR product patterns were observed,usually common to only one or two isolates,exceptionally six of stains have the same（K） deletion pattern,indicating great diversity in the aflatoxin biosynthesis pathway in *** isolates taken from different crops and *** extensive deletions of 10 or more genes in the aflatoxin gene cluster identified in candidate’s nonaflatoxigenic biocontrol *** isolates serve as a safeguard in preventing adverse genetic reversion,thereby ensuring their safe application to agricultural *** genes dma T and mao A could be used a marker genes for CPA production capacity atoxigenic *** control o

关键词： Aflatoxin Cyclopiazonic acid(CPA) Aspergillus flavus atoxigenic strain toxigenic strains biocontrol

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

World Journal of Stem Cells 2010年第6期2卷 127-140页

作者： Solomon mamo Julianna Kobolak Istvan Borbíró Tamás Bíró Istvan Bock Andras Dinnyes Genetic Reprogramming Group Agricultural Biotechnology CenterSzent-Gyorgyi Albert ut.4H-2100 GdllHungary Solomon MamoLyons Research FarmUniversity College DublinNewcastleCo DublinIreland Department of Physiology Research Center for Molecular MedicineMedical and Health Science CenterUniversity of DebrecenNagyerdei krt.98H-4032 DebrecenHungary Abiol Ltd. Nagyerdei krt.98H-4032 DebrecenHungary BioTalentum Ltd. Aulich l.26GdllHungary Andras DinnyesMolecular Animal Biotechnology LaboratorySzent Istvan UniversityPáter K.u.1H-2103 GdllHungary

AIM:To compare gene targeting efficiencies,expression profiles,and Ca2+ handling potentials in two widely used mouse embryonic stem cell ***:The two widely used mouse embryonic stem cell lines,R1 and HM-1,were cultured and maintained on Mitomycin C treated mouse embryonic fibroblast feeder cell layers,following standard culture *** were incubated with primary and secondary antibodies before fluorescence activated cell sorting analysis to compare known pluripotency ***,cells were harvested by trypsinization and transfected with a kinase-inactive murine Tyk2 targeting construct,following the BioRad and Amaxa transfection ***,the cells were cultured and neomycin-resistant cells were picked after 13 d of *** clones were screened twice by polymerase chain reaction(PCR) and finally confirmed by Southern blot analysis before *** gene expression profiles of more than 20 400 probes were also compared and significantly regulated genes were conf irmed by real time PCR *** handling potentials of these cell lines were also compared using various ***:We found signif icant differences in transfection eff iciencies of the two cell lines(91% ± 6.1% vs 75% ± 4.2%,P = 0.01).Differences in the targeting efficiencies were also significant whether the Amaxa or BioRad platforms were used for *** did not observe signif icant differences in the levels of many known pluripotency ***,our genomewide expression analysis using more than 20 400 spotted cDNA arrays identified 55 differentially regulated transcripts(P < 0.05) implicated in various important biological processes,including binding molecular functions(particularly Ca2+ binding roles).Subsequently,we measured Ca2+ signals in these cell lines in response to various calcium agonists,both in high and low Ca2+ solutions,and found signif icant differences(P < 0.05) in the regulation of Ca2+ homeostasis betwee

关键词： Embryonic stem cells Microarray Calcium Agonists Transfection Cell culture Pluripotency Gene targeting

AFB_(1)污染花生油激光诱导荧光信号受温度干扰规律及温度全局模型研究

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国粮油学报 2022年第10期37卷 7-13页

作者：何学明陈敏杨小云张曼曼沈飞袁建胡秋辉 Firew Tafesse mamo 南京财经大学食品科学与工程学院江苏省现代粮食流通与安全协同创新中心南京210023

激光诱导荧光光谱(LIF)技术在花生、无花果等坚果中黄曲霉毒素B_(1)(AFB_(1))检测应用已有大量研究。然而荧光信号易受环境因素(主要是温度)影响。本研究通过自主开发的LIF系统对不同温度下,花生油中AFB_(1)含量进行检测,探索温度对荧... 详细信息

激光诱导荧光光谱(LIF)技术在花生、无花果等坚果中黄曲霉毒素B_(1)(AFB_(1))检测应用已有大量研究。然而荧光信号易受环境因素(主要是温度)影响。本研究通过自主开发的LIF系统对不同温度下,花生油中AFB_(1)含量进行检测,探索温度对荧光信号的干扰规律。通过人为添加AFB_(1)标准品到10个品牌花生油中,配制不同AFB_(1)污染程度(控制组、0、5、10、20、25、30μg/kg)的花生油样本。使用LIF系统采集5种不同温度下(10、20、30、40、50℃)花生油的荧光光谱。光谱分析结果表明花生油荧光强度随着温度的升高而降低。使用5种不同建模方法建立全局模型,通过比较预测结果发现核函数为径向基函数(RBF)的支持向量机(SVM)方法所建立的全局模型预测效果最优,其正确率(CCR)超过99%,假阴性率(FNR)为0,假阳性率(FPR)为0.6%。在此基础上使用SVM(RBF)建立分温度模型,并使用各分温度模型分别对5个温度下验证集进行预测,结果表明各分温度模型在预测本温度验证集时,预测效果极优,正确率均高于97%,验证集FPR与FNR不超过5.5%,但在预测其他温度验证集时,效果极差。表明当使用LIF技术检测花生油AFB_(1)含量时,需要保证样本温度保持一致,或者通过建立温度全局模型提高模型鲁棒性。

关键词：激光诱导荧光花生油黄曲霉毒素B_(1) 温度全局模型

在线全文

学校读者我要写书评

暂无评论

珍惜眼前的时光

疯狂英语（阅读版） 2010年第6期 38-39页

作者： Yamit mamo 薇雨

“珍惜眼前的时光”“你知道所有的烦恼会消失，而爱会停留我不懂别的方式” 别＊＊＊不时地爱我我没在想何时去爱，因为我们所拥有的只有此刻

关键词：《珍惜眼前的时光》英语学习学习方法阅读

在线全文

学校读者我要写书评

暂无评论

利用粉末状活性炭废物净化污水

轻工环保 1991年第3期13卷 54-56页

作者： mamo.,AA 郭建钦

基于气相离子迁移谱技术的稻谷中玉米象快速定量检测分析

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国粮油学报 2022年第6期37卷 162-169页

作者：刘强倪小颖丁海臻 Firew Tafesse mamo 周曰春赵思琪胡秋辉丁超南京财经大学食品科学与工程学院江苏省现代粮食流通与安全协同创新中心江苏高校粮油质量安全控制及深加工重点实验室南京210023 巴赫达尔大学化学与食品工程学院巴赫达尔999047 南京灵山粮食储备库有限公司南京211599

本研究基于稻谷中玉米象挥发性成分特异性,利用气相离子迁移谱技术快速采集玉米象成虫、原样稻谷以及虫粮混合物的顶空气体信息,提取特征气味组分信号后形成气味指纹图谱,并尝试构建了稻谷中玉米象污染的定量线性模型。研究结果表明,玉... 详细信息

本研究基于稻谷中玉米象挥发性成分特异性,利用气相离子迁移谱技术快速采集玉米象成虫、原样稻谷以及虫粮混合物的顶空气体信息,提取特征气味组分信号后形成气味指纹图谱,并尝试构建了稻谷中玉米象污染的定量线性模型。研究结果表明,玉米象污染稻谷中共计检出37种挥发性化合物,其中醇类12种,醛类10种,酮类5种;不同玉米象数量样品GC-IMS信号强度存在显著差异,以戊醛、3-戊酮、苯乙烯、2-戊酮为特征的挥发性组分对应信号强度与玉米象密度呈典型线性关系,对应的R^(2)在0.986~0.988之间,可以作为玉米象污染稻谷的重要标识物质。研究结果证实了利用GC-IMS可以实现不同密度下稻谷中玉米象成虫数量的快速识别,将推动基于气味信息的快速检测技术在粮食产后储藏品质控制和安全评价方面的应用与推广。

关键词：气相离子迁移谱(GC-IMS) 玉米象挥发性有机物害虫密度

基于GC-IMS对充氮储藏粳稻风味特性影响研究

在线全文

学校读者我要写书评

暂无评论

中国粮油学报 2023年第1期38卷 123-131页

作者：丁超常乐郭啸天殷月陶婷婷倪小颖赵思琪丁海臻刘纪伟张婷婷 Firew Tafesse mamo 刘强南京财经大学食品科学与工程学院江苏省现代粮食流通与安全协同创新中心江苏高校粮油质量安全控制及深加工重点实验室南京210023 张家港市粮食质量监测站张家港215626 江苏农林职业技术学院茶与食品科技学院镇江212499 巴赫达尔大学化学与食品工程学院巴赫达尔999047

本研究采用气相离子迁移谱等技术(GC-IMS)探究粳稻充氮储藏期间挥发气体成分(VOCs)的变化趋势,调节粳稻谷含水量为13.5%,结合脂肪酸值、脂肪酶、过氧化物酶和过氧化氢酶的变化规律,探究粳稻充氮气调的储藏效果以及对其储藏稳定性的影响... 详细信息

本研究采用气相离子迁移谱等技术(GC-IMS)探究粳稻充氮储藏期间挥发气体成分(VOCs)的变化趋势,调节粳稻谷含水量为13.5%,结合脂肪酸值、脂肪酶、过氧化物酶和过氧化氢酶的变化规律,探究粳稻充氮气调的储藏效果以及对其储藏稳定性的影响。研究结果表明,粳稻储藏期间醇类、醛类为主要挥发性成分,其中1-戊醛、壬醛和辛醛直接参与了脂质代谢过程。充氮气调对部分直链醇(1-丁醇、1-戊醇、1-己醇)和长碳链线性醛(辛醛、壬醛)的抑制效果显著。通过构建脂肪含量变化动态预测模型,表明低温高浓度氮气储藏对脂肪酸值的抑制效果为63.25%,脂肪酶活性的稳定性可提升193.69%,过氧化氢酶稳定性提升了10.76%。充氮气调储藏可以通过抑制粳稻呼吸作用,降低脂质代谢关键酶的活性,降低了亚油酸代谢速率,改善了脂质代谢挥发性组分的生成,有效减缓了粳稻陈化劣变。

关键词：充氮气调稻谷酶活挥发性有机物脂质代谢

An Impression Of China

在线全文

学校读者我要写书评

暂无评论

Beijing Review 2013年第50期56卷 48-48页

作者： Kebede Kassa mamo

This was my first trip to China. During my flight to Beijing, I was reading a book entitled General Knowledge of China.

关键词：中国经济经济发展经济建设对外合作