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Gut microbiota in preterm infants receiving breast milk or mixed feeding

World Journal of Clinical Pediatrics 2024年第2期13卷 135-145页

作者： Sandra Gabriela Sánchez-González Bárbara Gabriela Cárdenas-del-Castillo Elvira Garza-González gerardo.r padilla-rivas.is.ías.ro.ríguez-balderrama Consuelo Treviño-Garza Fernando Félix Montes-Tapia gerardo C Palacios-Saucedo Anthony Gutiérrez-rodríguez Manuel Enrique de-la-O-Cavazos Department of Pediatrics Hospital Universitario“Dr.JoséEleuterio González”Universidad Autónoma de Nuevo LeónMonterrey 64460Nuevo LeónMéxico Departamento de Bioquímica y Medicina Molecular Universidad Autónoma de Nuevo LeónMonterrey 64460Nuevo LeónMéxico Department of Biochemistry and Molecular Medicine Universidad Autónoma de Nuevo LeónMonterrey 64460Nuevo LeónMéxico Department of Pediatric Surgery Hospital Universitario"Dr.JoséEleuterio González"Monterrey 64460Nuevo LeónMéxico

BACKGroUND Preterm birth is the leading cause of mortality in newborns,with very-low-birthweight infants usually experiencing several *** milk is considered the gold standard of nutrition,especially for preterm infants with delayed gut colonization,because it contains beneficial microorganisms,such as Lactobacilli and *** To analyze the gut microbiota of breastfed preterm infants with a birth weight of 1500 g or *** An observational study was performed on preterm infants with up to 36.6 wk of gestation and a birth weight of 1500 g or less,born at the University Hospital ***éEleuterio González at Monterrey,Mexico.A total of 40 preterm neonates were classified into breast milk feeding(BM)and mixed feeding(MF)groups(21 in the BM group and 19 in the MF group),from October 2017 to June *** samples were collected before they were introduced to any feeding *** full enteral feeding was achieved,the composition of the gut microbiota was analyzed using 16S rrNA gene *** variables were compared using Student’s t-test or using the Mann–Whitney U test for nonparametric ***,evenness,equitability,Margalef’s index,Fisher’s alpha,Chao-1 index,and Shannon’s diversity index were also *** No significant differences were observed at the genus level between the *** comparison indicated higher counts of Alphaproteobacteria and Betaproteobacteria in the initial compared to the final sample of the BM group(Pr counts of Gammaproteobacteria were detected in the final than in the initial sample(P=0.040).According to the Margalef index,Fisher’s alpha,and Chao-1 index,a decrease in species richness from the initial to the final sample,regardless of the feeding type,was observed(Pr predominant phyla were Bacteroidetes,Actinobacteria,Firmicutes,and Proteobacteria,with Proteobacteria being the most ***,no significant differences were

关键词： Gut microbiota Human milk Preterm infant Proteobacteria Very low birth weight 16S rrNA

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Is the kafirin profile capable of modulating the ileal digestibility of amino acids in a soybean meal-sorghum diet fed to pigs?

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Animal Nutrition 2019年第2期5卷 124-129页

作者： Víctor A.balderrama-Pérez JoséG.Gómez-Soto Tércia C.reis de Souza Ericka r.rodríguez gerardo Mariscal-Landín Facultad de Estudios Superiores Cuatitlán Universidad National Autónoma de MéxicoCuautitlan54714Mexico Facultad de Cientias Naturales Universidad Autónoma de QuerétaroQuerétaro76230Mexico Centro Nacional de Investigación Disciplinaria en Fisiología y Mejoramiento Animal Instituto Nacional de Investigaciones Forestales Agrícolas y PecuariasAjuchitilan76380Mexico

The effects of kafirins on protein and amino acid ileal digestibility have not been evaluated in vivo in *** aim of this study was to determine the effects of protein profile on apparent ileal digestibility(AID)of amino acids. We used a sorghum hybrid with low tannin content(rid was harvested from 2 different plots with different kafirin profile. Sorghum with greater content of total kafirins had less content of y-and al-kafirins and higher content of β-and a2-kafirins than that with lower content of total kafirins. Two sorghum-soybean meal(SBM) diets were formulated: 1) low kafirin(LK) content(32.2 g/kg) and 2) high kafirin(HK) content(48.1 g/kg). A control diet(maize-SBM) and a reference SBM-diet were also prepared. The reference diet was fed to all pigs following the experimental period and was used to estimate the AID of cereals by the difference method. 'T' cannulas were fixed in the distal ileum of 18 barrows(6 by treatment), divided into 2 groups of 9 pigs. The pigs were fed 2.5 times their maintenance requirement of digestible energy(110 kcal/kg BW00.75). The AID of dry matter,protein, amino acids, and energy of the experimental diets was measured;the AID of cereals(maize, LK sorghum and HK sorghum) was estimated by the difference method. The maize-SBM diet was more digestible than the sorghum-SBM diets, only with respect to valine(P r than that in sorghum-SBM diets. The changes in kafirin profile between the diets only affected the AID of threonine(P reased by 9.5 percentage units in LK diet compared with HK diet. regarding the AID of cereals, maize exhibited greater AID than sorghum, with respect to valine(P rine(P rison of sorghum with LK and HK content showed that the AID of threonine and serine increased by 50.5(P rcentage units(P r, respec:tively. The higher content of γ-kafirins in L

关键词： Amino acids Ileal digestibility Kafirin Pig Sorghum

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Nucleation and growth kinetics of La0.7Sr0.3Cr0.4Mn0.6O3-δ SOFC perovskite:Symmetry alteration evolution induced by Cu2+ and Ni2+ impregnation

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Progress in Natural Science:Materials International 2016年第6期26卷 665-670页

作者： A.Concha-balderrama G.rojas-George J.Alvarado-Flores H.Esparza-Ponce M.H.Bocanegra-Bernal A.reyes-rojas Centro de Investigación en Materiales Avanzados S.C.(CIMAV) Laboratorio Nacional de NanotecnologíaMiguel de Cervantes 120 Complejo Industrial ChihuahuaCd.de Chihuahua

La0.7Sr0.3Cr0.4Mn0.6O3-δperovskite nanoparticles have been synthetized using an ethylene glycol modified solgel method and impregnated by Cu0.75Ni0.25nanoparticles. The phase transitions and nucleation kinetics were studied by time resolved x-ray diffraction, rietveld, raman spectroscopy and high resolution transmission electron microscopy. Findings have shown that, an atomic disorder dominates from room temperature to 400 °C. Nanoparticles with crystal size rt through nuclei formation of La0.7Sr0.3Cr0.4Mn0.6O3-δand SrCro4solid solutions with Pm3m cubic and P21/n monoclinic symmetry respectively in the range of 600–650 °C. Symmetry reduction from the Pm3m→r3c space group had been obtained at a lower temperature（750 °C） than those reported in the literature in oxygen atmosphere and it was confirmed by an octahedral distortion, which takes place in the crystallographic direction[221]/（122）. The Johnson-Mehl-Avrami model had described the whole process, where the existence of two phases was shown before it reached its complete D3d6point group symmetry.

关键词： Perovskite structure Sol-gel method Composite Kinetics rietveld

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控制酸性岩排出物的尾矿再选

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国外金属矿选矿 1998年第11期35卷 22-25页

作者： r.M贝尔德拉玛魏明安 r.M.balderrama RenoResearchCenterU.S.BureauofMines1605EvansAveRenoNV89512

实验室中进行了从尾矿中除去含硫物料、主要是黄铁矿的浮选和重选试验．这种物料是产生酸的根源．浮选中组合使用黄药类捕收剂、调整剂和起泡剂．黄铁矿的回收率取决于被处理的尾矿，平均为42～97％．给矿中含流量12.8％～0.37％,处理... 详细信息

实验室中进行了从尾矿中除去含硫物料、主要是黄铁矿的浮选和重选试验．这种物料是产生酸的根源．浮选中组合使用黄药类捕收剂、调整剂和起泡剂．黄铁矿的回收率取决于被处理的尾矿，平均为42～97％．给矿中含流量12.8％～0.37％,处理后减到8.68～0.01％．浮选试验用来评价尾矿中黄铁矿含量与酸性岩排出物（ArD）的关系．标准ArD预测试验用来评价处理的可行性．在某些情况下．只要除去50～55％的黄铁矿，就可使尾矿由酸性转变成非酸性．用实验室摇床试验，来评价含硫尾矿重选分离的可行性，黄铁矿回收率38～86％．给矿中含硫12.8－0.37％，处理后含硫6.0～0.14％，对尾矿进行的的ArD预测试验表明，重选前后，大多数含硫样品从“可能”变成了“不一定”产酸。本文报道的数据和分析表明：采用常规浮选和重选技术除去含硫尾矿中的金属硫化物，可以控制ArD的产生．

关键词：黄铁矿浮选重选尾矿再选酸性岩

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