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A review of feed efficiency in swine:biology and application

Journal of Animal Science and Biotechnology 2015年第4期6卷 369-377页

作者： John F.Patience Mariana C.Rossoni-Seräo nestor a.gutiérrez Department of Animal Science Iowa State University

Feed efficiency represents the cumulative efficiency with which the pig utilizes dietary nutrients for maintenance, lean gain and lipid accretion. It is closely linked with energy metabolism, as the oxidation of carbon-containing components in the feed drive all metabolic processes. While much is known about nutrient utilization and tissue metabolism, blending these subjects into a discussion on feed efficiency has proven to be difficult. For example, while increasing dietary energy concentration will almost certainly increase feed efficiency, the correlation between dietary energy concentration and feed efficiency is surprisingly low. This is likely due to the plethora of non-dietary factors that impact feed efficiency, such as the environment and health as well as individual variation in maintenance requirements, body composition and body weight. Nonetheless, a deeper understanding of feed efficiency is critical at many levels. To individual farms, it impacts profitability. To the pork industry, it represents its competitive position against other protein sources. To food economists, it means less demand on global feed resources. There are environmental and other societal implications as well. Interestingly, feed efficiency is not always reported simply as a ratio of body weight gain to feed consumed. This review will explain why this arithmetic calculation, as simple as it initially seems, and as universally applied as it is in science and commerce, can often be misleading due to errors inherent in recording of both weight gain and feed intake. This review discusses the importance of feed efficiency, the manner in which it can be measured and reported, its basis in biology and approaches to its improvement. It concludes with a summary of findings and recommendations for future efforts.

关键词： Caloric efficiency Energy Feed efficiency Residual feed intake Swine

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Nodal user’s demand response based on incentive based programs

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Journal of Modern Power Systems and Clean Energy 2017年第1期5卷 79-90页

作者： nestor GONZáLEZ-CABRERA Guillermo gutiérrez-ALCARAZ Instituto Tecnolo´gico Superior de Irapuato Irapuato 36620Mexico Instituto Tecnolo´gico de Morelia Morelia 58120Me´xico

This paper describes a practical approach to identify nodal price compensation payment for nodal consumers willing to reduce their energy consumption(consumers’ demand response). The implementation of a nodal reliability service pricing is based on contingency assessment of N-2 order for transmission lines. A representative annualized demand curve is used to reflect the system’s operation condition by seasons. Such curve is used to access the nodal reliability impact trough a whole year in order to determine back-payments(incentive payment) to users for service interruption. The IEEE_RTS 24 nodes system is used to implement the proposed approach.

关键词： Nodal demand response Demand side management Reliability assessment Incentive based programs(IBP)

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Autolytic and Proteolytic Properties of Strains of<i>Lactococcus lactis</i>Isolated from Different Vegetables, Raw-Milk Cheeses and Commercial Starter Cultures

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Food and Nutrition Sciences 2013年第11期4卷 21-26页

作者： Carolina Nájera-Domínguez nestor gutiérrez-Méndez Chemistry Faculty University Autonomous of Chihuahua Chihuahua Mexico.

The autolysis and proteolysis are important features in the strains of L. lactis used in the manufacture of cheese. The autolytic and proteolytic activity of L. lactis has been linked with the development of flavor and texture in the cheese. On the other hand, there is a growing interest in new strains isolated from raw-milk cheeses and vegetables. These wild-strains have showed different features of industrial importance in comparison with those observed in commercial cultures. However, it still not clear if the autolytic and proteolytic properties of these wild-strains differ from the industrial strains. The objective of this work was to assess the autolytic and proteolytic activities of 21 strains of L. lactis isolated from diverse sources. The rates of autolysis and proteolysis observed in vitro were highly strain-dependent. The pH and the NaCl concentration in the media affected significantly the autolysis of L. lactis. The strains isolated from vegetable showed in general low and medium autolytic activity, whereas the strains isolated from raw-milk cheeses had medium to high autolytic activity. The strain with highest proteolytic activity was a strain isolated from corn leaves. Although still not clear how this strain acquired this pronounced characteristic.

关键词： Com Autolysis Proteolysis L. lactis Wild-Strains

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Advancing respirable coal mine dust source apportionment:a preliminary laboratory exploration of optical microscopy as a novel monitoring tool

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International Journal of Coal Science & Technology 2024年第2期11卷 222-233页

作者： nestor Santa Emily Sarver Department of Mining and Minerals Engineering Virginia TechBlacksburgVA 24061USA

Exposure to respirable coal mine dust(RCMD)can cause chronic and debilitating lung ***-time monitoring capabilities are sought which can enable a better understanding of dust components and *** many underground mines,RCMD includes three primary components which can be loosely associated with three major dust sources:coal dust from the coal seam itself,silicates from the surrounding rock strata,and carbonates from the inert‘rock dust’products that are applied to mitigate explosion hazards.A monitor which can reliably partition RCMD between these three components could thus allow source *** tracking silicates,specifically,could be valuable since the most serious health risks are typically associated with this component-particularly if abundant in crystalline *** a monitoring concept based on field microscopy,and following up on prior research using polarized light,the aim of the current study was to build and test a model to classify respirable-sized particles as either coal,silicates,or *** model development,composite dust samples were generated in the laboratory by successively depositing dust from high-purity materials onto a sticky transparent substrate,and imaging after each deposition event such that the identity of each particle was known a *** testing followed a similar approach,except that real geologic materials were used as the source for each dust *** showed that the model had an overall accuracy of 86.5%,indicating that a field-microscopy based moni-tor could support RCMD source apportionment and silicates tracking in some coal mines.

关键词： Polarized light microscopy Image processing Dust monitoring Respirable silica Coal mining

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Analysis of forestry impacts and biodiversity in two Pyrenean forests through a comparison of moth communities （Lepidoptera, Heterocera）

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Insect Science 2007年第4期14卷 323-338页

作者： CARINE LUOUE CHARLES GERS JACQUES LAUGA nestor MARIANO Laboratoire Dynamique de la Biodiversit6 UMR5172CNRS/Universit6Paul SabatierToulouseFrance Institut fur Pharmazie und Molekulare Biotechnologie-Abteilung Biologie Universitat HeidelbergHeidelbergGermany Evolution et Diversit6Biologique UMR 5174 CNRS/Universit6 Paul SabatierToulouseFrance CEAMISH-Universidad Aumnoma EstadoMorelos CuemavacaMorelosCP:62210 Mexico

We have compared the biodiversity variations in moth communities between unmanaged forests and commercial forests in a mountainous environment （Pyrenees France）. The aim was to evaluate the impact of forestry activities on moth diversity. The data collected from the insects were analysed with a Bayesian specific similarity index （noted SSP index） and by statistical biodiversity indexes comparison. It was seen that diversity and richness were decreased in the plantation compared to the unmanaged forest. Interestingly, the composition of the communities of moths was shown to be not only related to the presence/absence of host plants, but also to be in relation with changes in the differences in forest architecture （i.e. the relative coverage by the different vegetation levels）. However, the moth community in the commercial forest still has a high capacity to converge with the moth community present in more natural forests. We report here a list of 177 species of moths, providing information on the distribution of some uncommon species, poorly studied as yet in the Pyrenees.

关键词： biodiversity Lepidoptera Heterocera mountainous forest ecosystems

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The determination of thermal junction potential difference

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Science China Chemistry 2018年第8期61卷 1020-1024页

作者： nestor Uwitonze Wei Chen Da Zhou Zhengda He Yan-Xia Chen Hefei National Laboratory for Physical Sciences at Microscale Department of Chemical Physics University of Science and Technology of China

A novel method has been designed and exploited to determine the thermal junction potential difference(TJPD) between two acids or alkalies of the same composition but with different temperature. The absolute value of measured TJPD between two strong acids(or alkalies) maintained at different temperatures increases with increasing of the temperature difference between the two electrolytes over the range from 0 to 40 °C. In strong acids, the hot end always has the lower potential while in strong alkalies, the cold end has the lower potential. This is because the ions of fast diffusion rate contribute most to the TJPD. Our results demonstrate the importance of the correction for TJPD in deriving the kinetic parameters when studying the temperature effect on reaction kinetics.

关键词： thermal junction potential difference temperature effect electrocatalysis electrode kinetics activation energy

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Effect of mass transfer and solution composition on the quantification of reaction kinetics by differential electrochemical mass spectrometry

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Journal of Energy Chemistry 2021年第5期30卷 412-419页

作者： Wei Chen nestor Uwitonze Fan He Matthew MSartin Jun Cai Yan-Xia Chen Hefei National Laboratory for Physical Sciences at Microscale Department of Chemical PhysicsUniversity of Science and Technology of ChinaHefei 230026AnhuiChina

Differential electrochemical mass spectrometry(DEMS)is one of the most powerful techniques for both the mechanistic and kinetic study of complicated electrocatalytic *** can provide information on the nature and yields of the products generated,their production rate,and the structure-activity relationship between the electrocatalysts and the target *** precise calibration of the mass signal is a prerequisite for the accurate evaluation of reaction *** this work,we use the oxidation reactions of CO and HCOOH to demonstrate how certain conditions,such as the flow rate and solution composition,affect the collection efficiency and ionization probability of the species to be *** parameters can affect the determination of the mass calibration constant and the accuracy of the subsequent quantitative DEMS *** show the relationship between the mass calibration constant and the flow rate,and provide strategies for eliminating this and the related problems.

关键词： Differential electrochemical mass spectrometry Quantitative analysis Calibration Flow rate Background correction

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Diverse chirped optical solitons and new complex traveling waves in nonlinear optical fibers

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Communications in Theoretical Physics 2020年第6期72卷 106-119页

作者： Savaissou nestor Souleymanou Abbagari Alphonse Houwe Mustafa Inc Gambo Betchewe Serge Y Doka Department of Physics Faculty of Sciencethe University of MarouaP O Box 814MarouaCameroon Department of Basic Science Faculty of Mines and Petroleum IndustriesUniversity of MarouaMarouaCameroon Firat University Science FacultyDepartment of Mathematics23119 ElazigTurkey Department of Medical Research China Medical University HospitalChina Medical UniversityTaichungTaiwanChina Department of Physics Faculty of Sciencethe University of NgaoundereP O Box 454Cameroon

This paper studies chirped optical solitons in nonlinear optical ***,we obtain diverse soliton solutions and new chirped bright and dark solitons,trigonometric function solutions and rational solutions by adopting two formal integration *** obtained results take into account the different conditions set on the parameters of the nonlinear ordinary differential equation of the new extended direct algebraic equation *** results are more general compared to Hadi et al(2018 Optik 172545–53)and Yakada et al(2019 Optik197163108).

关键词： diverse chirped optical solitons nonlinear optical fibers new extended direct algebraic method

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Sources of transcription variation in Plasmodium falciparum

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Journal of Genetics and Genomics 2022年第10期49卷 965-974页

作者： Lindsey B.Turnbull Katrina A.Button-Simons nestor Agbayani Michael T.Ferdig Department of Pediatrics Indiana University School of MedicineIndianapolisIN 46202USA Department of Biological Sciences Eck Institute for Global HealthUniversity of Notre DameNotre DameIN 46556USA Rush School of Medicine ChicagoIL 60612USA

Variation in transcript abundance can contribute to both short-term environmental response and long-term evolutionary *** studies are designed to assess differences in mean transcription levels and do not consider other potentially important and confounding sources of transcriptional *** quantification of variation sources will improve our ability to detect and identify the mechanisms that contribute to genome-wide transcription changes that underpin adaptive *** quantify innate levels of expression variation,we measured m RNA levels for more than 5000 genes in the malaria parasite,Plasmodium falciparum,among clones derived from two parasite strains across biologically and experimentally replicated *** a mixed effects model,we partitioned the total variation among four sources—between strain,within strain,environmental batch effects,and stochastic *** found 646 genes with significant variation attributable to at least one of these *** genes were categorized by their predominant variation source and further examined using gene ontology enrichment analysis to associate function with each source of *** with environmental batch effect and within strain transcript variation may contribute to phenotypic plasticity,while genes with between strain variation may contribute to adaptive responses and processes that lead to parasite strain-specific survival under varied conditions.

关键词： Expression variation Malaria Transcription Cloning Microarray

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Approximate Expressions to Evaluate the Performance in Butene-1 Purification Units

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Chinese Journal of Chemical Engineering 1998年第3期6卷 87-92页

作者： Sergio P.Bressa nestor O.Ardiaca Osvaldo M.Martinez Guillermo F.Barreto Depto.de Ing.Qca. Fac.de Ing.U.N.L.P.l esq.47(1900)La PlataDepto.de Ing.Qca.Fac.de Ing.U.N.L.P.l esq.47(1900)La PlataDepto.de Ing.Qca.Fac.de Ing.U.N.L.P.l esq.47(1900)La PlataDepto.de Ing.Qca.Fac.de Ing.U.N.L.P.l esq.47(1900)La Plata

1 INTRODUCTIONSelective hydrogenatioll of small amounts of butynes and butadiene is industrially employedfor obtaining high purity butene-l used as co-monomer in the production of linear *** this purpose,the content o... 详细信息

关键词： selective hydrogenation butene-1 1 3-butadiene trickle bed reactor

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