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原料乳及牧场环境中的微生物多样性及嗜冷菌污染源分析

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中国食品学报 2024年第3期24卷 258-267页

作者：胡少震逯刚喻东威吕加平张书文李莲瑞逄晓阳塔里木大学生命科学与技术学院新疆阿拉尔843300 中国农业科学院农产品加工研究所北京100193 内蒙古蒙牛乳业(集团)股份有限公司呼和浩特011517

原料乳中嗜冷菌超标会产生较高水平的耐热蛋白酶和脂肪酶,这两种酶是导致产品进入货架期后出现质量问题的重要原因。为探究牧场奶牛生活环境以及原料乳在流转过程中不同环节的微生物多样性,找出牧场中嗜冷菌的污染来源,本研究选取河北... 详细信息

原料乳中嗜冷菌超标会产生较高水平的耐热蛋白酶和脂肪酶,这两种酶是导致产品进入货架期后出现质量问题的重要原因。为探究牧场奶牛生活环境以及原料乳在流转过程中不同环节的微生物多样性,找出牧场中嗜冷菌的污染来源,本研究选取河北地区某规模化奶牛养殖场,采集TMR饲料、牛舍垫土、头三把奶、头三把奶之后的常规乳以及储奶罐中的原料乳等样品,利用宏基因组测序技术对所有样品的菌群结构、嗜冷菌种类及丰度进行分析。结果表明:在门水平上,主要微生物为变形菌门、厚壁菌门、放线菌门,在属水平上主要是无形体属、链球菌属、肠球菌属、短螺菌属、芽孢杆菌属、假单胞菌。此外对样品中的关键嗜冷菌(假单胞菌)进行分析,牛舍垫土的多样性最丰富的,包含了牧场中常规乳及储奶罐中乳假单胞菌种类的99.63%和96.39%,说明牛舍垫土是各类假单胞菌潜在的污染源。

关键词：宏基因组测序技术微生物多样性嗜冷菌假单胞菌污染来源

Comparison of decolorization of reactive azo dyes by microorganisms isolated from various sources

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Journal of Environmental sciences 2003年第5期15卷 628-632页

作者： s.Padamavathy s.sandhya K.swaminathan Y.V.subrahmanyam s.N.Kaul NationalEnvironmentalEngineeringResearchInstitute NationalEnvironmentalEngineeringResearchInstituteNationalEnvironmentalEngineeringResearchInstituteNationalEnvironmentalEngineeringResearchInstituteNationalEnvironmentalEngineeringResearchInstitute CSIRComplexChennaiIndiaCSIRComplexChennaiIndiaCSIRComplexChennaiIndiaCSIRComplexChennaiIndiaCSIRComplexChennaiIndia

Azo dyes are among the oldest man made chemicals and they are still widely used in the textile, printing and the food industries. About 10%-15% of the total dyes used in the industry is released into the environment during the manufacturing and usage. some dyes and some of their N substituted aromatic bio transformation products are toxic and/or carcinogenic and therefore these dyes are considered to be environmental pollutants and health hazards. These azo dyes are degraded by physico chemical and biological methods. Of these, biological methods are considered to be the most economical and efficient. In this work, attempts were made to degrade these dyes aerobically. The organisms which were efficient in degrading the following azo dyes Red RB, Remazol Red, Remazol Blue, Remazol Violet, Remazol Yellow, Golden Yellow, Remazol Orange, Remazol Black were isolated from three different sources viz., wastewater treatment plant, paper mill effluent treatment plant and tannery wastewater treatment plant. The efficiency of azo dye degradation by mixed cultures from each source was analyzed. It was found that mixed cultures from tannery treatment plant worked efficiently in decolorizing Remazol Red, Remazol Orange, Remazol Blue and Remazol Violet, while mixed cultures from the paper mill effluent worked efficiently in decolorizing Red RB, Golden Yellow and Remazol Yellow. The mixed cultures from wastewater treatment plant efficiently decolorized Remazol Black.

关键词： azo dyes decolorization aerobic transformation

THE sPACEs OF CEsRO AlMOsT CONVERGENT sEQUENCEs AND CORE THEOREMs

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Acta Mathematica scientia 2012年第6期32卷 2265-2278页

作者： Kuddusi Kayaduman Mehmet sengönül science and Art Faculty Gaziantep UniversityGaziantep/Turkey science and Art Faculty Nev sehir UniversityNev sehir/Turkey

As known, the method to obtain a sequence space by using convergence field of an infinite matrix is an old method in the theory of sequence spaces. However, the study of convergence field of an infinite matrix in the space of almost convergent sequences is so new （see [15]）. The purpose of this paper is to introduce the new spaces ^ ～f and fo consisting of all sequences whose Ceshro transforms of order one are in the spaces f and ^ ～ f0, respectively. Also, in this paper, we show that ^ ～f and ^ ～f0 are linearly isomorphic to the spaces f and f0, respectively. The β- and γ-duals of the spaces ^ ～f and 2% are computed. Furthermore, the classes （^ ～f： μ） and （μ ： f） of infinite matrices are characterized for any given sequence space μ, and determined the necessary and sufficient conditions on a matrix A to satisfy Bc-core（Ax） K-core（x）, K-core（Ax） Bg-core（x）, Bc-core（Ax） Be-core（x）, Bc-core（Ax） t-core（x） for all x ∈ t∞.

关键词： almost convergence matrix domain of a sequence space β- and γ-duals andmatrix transformations core theorems isomorphism

Advance on the production of polyhydroxyalkanoates by mixed cultures

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Frontiers in Biology 2007年第1期2卷 21-25页

作者： lÜ Yaoping College of Chemistry and life science Lishui UniversityLishui 323000China

Polyhydroxyalkanoates(PHAs)are the polymers of hydroxyalkanoates that accumulate as carbon/energy or reducing-power storage material in various *** have attracted considerable attention as biodegradable substitutes for conventional *** now,however,industrial production of PHAs has encountered only limited *** main barrier to the replacement of synthetic plastics by PHAs has been the higher *** use of mixed cultures and renewable sources obtained from waste organic carbon can substantially decrease the cost of PHA and increase their market *** work reviews two main methods of PHA production by mixed cultures,anaerobic-aerobic processing and aerobic transient feeding processing,and analyzed the metabolic and effective factors.

关键词： polyhydroxyalkanoates(PHAs) mixed cultures anaerobic-aerobic processing aerobic transient feeding processing

social interactions in a solitary carnivore

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Current Zoology 2017年第4期63卷 357-362页

作者： l. Mark ElBROCH Howard QUIGlEY Panthera 8 West 40th Street 18th Floor New York NY 10018 USA

In total, 177 of 245 terrestrial carnivores are described as solitary, and much of carnivore ecology is built on the assumptions that interactions between adult solitary carnivores are rare. We employed Global Positioning system （GPs） technology and motion-triggered cameras to test predictions of land-tenure territoriality and the resource dispersion hypothesis in a territorial carnivore, the puma Puma concolor. We documented 89 independent GPs interactions, 60% of which occurred at puma kills （n=53）, 59 camera interactions, 11 （17%） of which captured courtship behaviors, and 5 other interactions （1 F-F, 3 M-F, and 1 M-M）. Mean minimum weekly contact rates were 5.5 times higher in winter, the season when elk Cervus elaphus were aggregated at lower elevations and during which puma courtship primarily occurred. In winter, contacts rates were 0.6_＋ 0.3 （standard devi- ation （sD）） interactions/week vs. 0.1 _＋ 0.1 （sD） interactions/week during summer. The preponder- ance of interactions at food sources supported the resource dispersion hypothesis, which predicts that resource fluxes can explain temporary social behaviors that do not result in any apparent benefits for the individuals involved. Conspecific tolerance is logical when a prey is so large that the predator that killed it cannot consume it entirely, and thus, the costs of tolerating a conspecific sharing the kill are less than the potential costs associated with defending it and being injured. Puma aggregations at kills numbered as high as 9, emphasizing the need for future research on what explains tolerance among solitary carnivores.

关键词： carnivores competition Puma concolor resource dispersion hypothesis social interactions tolerance.

The research works of Coulomb and Amontons and generalized laws of friction

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Friction 2015年第2期3卷 183-190页

作者： Elena POPOVA Valentin l.POPOV Institute of Mechanics Technische Universität Berlin10623Berlin National Research Tomsk state University 634050 TomskRussia

The paper is devoted to the contributions of Coulomb and Amontons to the physics of friction from the viewpoint of current discussions and attempts to formulate generalized laws of friction.

关键词： static friction sliding friction kinetics of friction material dependency history of science

QKD in Cloud-Fog Computing for Personal Health Record

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Computer systems science & Engineering 2022年第10期43卷 45-57页

作者： l.Arulmozhiselvan E.Uma Department of Information science and Technology Anna UniversityChennai600025India

Cloud computing is a rapid growing technology which delivers computing services such as servers,storage,database,networking,software and *** has brought a new way to securely store and share information and data with multiple *** authorized person access these clouds,the released data should not compromise any individual’s privacy and identity should not be *** Computing is the extension of cloud with decentralized structure which stores the data in locations somewhere between the data source and *** goal of fog computing is to provide high security,improve performance and network *** use quantum key distribution to produce and distribute key which change its quantum state and key,when key is known by mediator and it has ability to detect presence of mediator trying to gain lore of the *** this paper,we introduced sugar-salt encryption which overcomes brute-force attack in effect delivers phony data in return to every incorrect guess of the password or key.

关键词： security cloud computing fog computing quantum key distribution sugar-salt encryption

Approaches to antiretroviral therapy in China

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Cell Research 2005年第Z1期15卷 895-902页

作者： Bruce l GIllIAM Robert R REDFIElD Division of Clinical Care and Research Institute of Human Virology University of Maryland Baltimore MD 21201 USA

China has recognized the threat of HIV to its population and responded with a national antiretroviral treatment (ART) program. However, high ART failure rates and the spread of resistance within populations are important realities to consider when developing and managing ART programs in China and worldwide. Concepts which will define treatment success and local and national programmatic goals are 1) access to ART, 2) durability of ART at the patient level, 3) scalability of treatment modalities, and the 4) sustainability of the program at the community or national level. In the face of limited resources, China must also consider when to start ARV therapy, which agents to use, when to switch them, and how to treat highly experienced patients with drug resistance. The optimal ARV regimen to start with is changing frequently with the introduction of new agents and the presentation of new data. Currently, a regimen including tenofovir, emtricitabine or lamivudine and a nonnucleoside reverse transcriptase inhibitor appears to have optimal characteristics to treat HIV/AIDs in China. However, critical to all of these choices is the evaluation of programs implemented to insure wide scale success. China has wisely begun this process of evaluating the perfor- mance of local programs through systematic monitoring and evaluation of treatment outcomes. This will allow regi- mens and programs that work to be expanded, and programs with high failure rates to be eliminated. In the end, evidence based data supporting treatment strategies will allow China to successfully confront its AIDs epidemic early and prevent its tragic consequences

关键词： antiretroviral therapy scalability HIV/AIDs.

The selberg-Delange method in short intervals with some applications

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science China Mathematics 2019年第3期62卷 447-468页

作者： Zhen Cui Guangshi lü Jie Wu Department of Mathematics Shanghai Jiao Tong University school of Mathematics Shandong University school of Mathematics and statistics Yangtze Normal University InstitutElie Cartan de lorraine Université de Lorraine

In this paper, we establish a quite general mean value result of arithmetic functions over short intervals with the selberg-Delange method and give some applications. In particular, we generalize selberg's result on the distribution of integers with a given number of prime factors and Deshouillers-Dress-Tenenbaum's arcsin law on divisors to the short interval case.

关键词： asymptotic results on arithmetic functions selberg-Delange method arithmetic functions distribution of integers