检索结果-南通市图书馆

Arsenic and chromium resistance mechanisms in the Micrococcus luteus group

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2023年第4期33卷 600-611页

作者： Ivan ARROYO-HERRERA Brenda ROMÁN-PONCE Rafael BUSTAMANTE-BRITO Joseph GUEVARA-LUNA Erika yanet TAPIA-GARCÍA Violeta LARIOS-SERRATO Nannan ZHANG Paulina ESTRADA-DE LOS SANTOS En Tao WANG María Soledad VÁSQUEZ-MURRIETA Escuela Nacional de Ciencias Biológicas Instituto Politécnico NacionalCiudad de México 11340(Mexico) Universidad Politécnica del Estado de Morelos Jiutepec 62550(Mexico) Centro de Ciencias Genómicas Universidad Autónoma de MéxicoCuernavaca 62210(Mexico) CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilisation&Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province Chengdu Institute of BiologyChinese Academy of SciencesChengdu 610041(China)

High arsenic(As)and chromium(Cr)concentrations are currently receiving attention because of their negative effects on the environment and human *** inhabiting contaminated environments have developed resistance mechanisms against the toxicity of these ***,members of the bacterial genus Micrococcus have been isolated from different toxic metal-contaminated environments;however,knowledge concerning its resistance mechanisms to As and Cr toxicity remains *** luteus strains(An24,Mh,NE2TL6,and NE2TTS4)were isolated from the endosphere and soil of two heavy metal-contaminated sites in Mexico to identify differences in the resistance mechanisms by the *** *** strains were resistant to As(As^(3+)and As^(5+)),chromate,dichromate,cobalt,copper,nickel,and *** analysis indicated that the heavy metal-resistant strains(An24,Mh,NE2TL6,and NE2TTS4)could be assigned to the *** group and had more heavy metal-resistant genes(transporters,chaperones,and enzymes)compared to reference strains of the *** group,*** NCTC 2665^(T)and Micrococcus endophyticus JCM 16951^(T).The resistant bacteria were able to biotransform As^(3+)and As^(5+)through a carbon source-dependent *** biotransformation of As5+was potentially carried out in the cytoplasm through a thioredoxin-dependent pathway,which may be coupled with biosorption.A qualitative analysis of organic acids(OAs)identified a change in the OA profile of the metal-resistant strains that was As-or *** genomic and phenotypic findings suggest that the four *** group strains evaluated in the current study have developed resistance mechanisms that may enable their survival in contaminated sites.

关键词： arsenophore biosorption genome analysis heavy metal-resistant strain immobilization organic acid pollutant

Polyphenol Oxidase Inactivation by Microwave Oven and Its Effect on Phenolic Profile of Loquat (<i>Eriobotrya japonica</i>) Fruit

在线全文

学校读者我要写书评

暂无评论

Food and Nutrition Sciences 2013年第9期4卷 87-94页

作者： yanet Chávez-Reyes Lidia Dorantes-alvarez Daniel Arrieta-Baez Obed Osorio-Esquivel Alicia Ortiz-Moreno Departamento de Ingeniería Bioquímica Escuela Nacional de Ciencias Biológicas Instituto Politécnico Nacional México D.F. México Espectrometría de Masas y RMN Centro de Nanociencias y Micro y NanoTecnología México D.F. México Instituto de Salud Pública Universidad de Chalcatongo Chalcatongo de Hidalgo Oaxaca México.

The objective of this research was investigated the effect of polyphenol oxidase microwave treatment on phenolic composition, antioxidant activity and microstructure of loquat fruit. Phenolic profile of methanolic extracts prepared from fresh, and microwave-treated samples were analyzed. Antioxidant activity was also evaluated by 2,2’-azinobis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS?+) and 1,1-diphenyl-2-picrylhydrazyl (DPPH+) methods. In addition, polyphenol oxidase inactivation was carried out using a response surface methodology to establish the optimal conditions of treatment. The phenolic content of fresh mesocarp was 311 ± 0.60 mg gallic acid equivalents (GAE)/100g dry weight (DW) and that of microwave-treated mesocarp was 1230 ± 0.36 mg GAE/100g DW. Total phenolic content of water/ methanol extract significantly increases after microwave treatment rather than methanolic extract of fresh loquat. Five glycoside phenolics were identified by HPLC-DAD-MS as 3-caffeoylquinic acid, 3-p-coumaroylquinic acid, 5-caffeoylquinic acid and quercetin-3-O-sambubioside. Methanolic extract of microwave-treated mesocarp showed higher antioxidant activity than that of fresh mesocarp. Thus, polyphenol oxidase inactivation by microwave energy preserved the integrity of phenolic compounds as well as antioxidant activity in mesocarp extracts prepared from loquat fruit. It was also noted that phenolics were more abundant in the microwaved samples than in the fresh samples.

关键词： Loquat Phenolic Compounds Polyphenol Oxidase Microwave Eriobotrya japonica

An egg-shell bifunctional CeO_(2)-modified NiPd/Al_(2) O_(3) catalyst for petrochemical processes involving selective hydrogenation and hydroisomerization

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2021年第11期39卷 1382-1388,I0003页

作者： Franklin J.Mendez Javier A.Alves Yahse Rojas-Challa Oscar Corona yanet Villasana Julia Guerra German Garcia-Colli Osvaldo M.Martinez Joaquin L.Brito Centro de Quimica Instituto Venezolano de Invesdgaciones CientfficasCarretera PanamericanaKm 11 Altos de PipeCaracas1020AVenezuela Departamento de Estado Solido Instituto de FisicaUniversidad Nacional Autonoma de MexicoCiudad UniversitariaCiudad de Mexico04510Mexico Departamento de Ingenieria Quimica Facultad de Ingenieria(UNLP)and Centro de Investigacion y Desarrollo en Ciencias Aplicadas"Dr.J.J.Ronco"(CINDECA)CCT-La Plata-CONICET-UNLPLa Plata1900Argentina Departamento de Quimica Analitica Facultad de QufmicaUniversidad Nacional Autonoma de MexicoCiudad UniversitariaCiudad de Mexico04510Mexico Instituto Tecnoldgico Venezolano Del Petroleo SA. Petrole os de Venezuela SA.Urb.Santa Rosa-Sector El TamborLos Teques1201Venezuela Instituto Superior de Formacion Docente Salome Urena Esquina Leonardo D'VinciSanto Domingo10114Republica Dominicana Biomass to Resources Group Universidad Regional Amazonica IkiamKm 7 via MuyunaTena150150Ecuador Departamento de Termodinamica y Fenomenos de Transferencia Universidad Simon BolivarValle de SartenejasCaracas1086Venezuela

The catalytic performance during the 1-butyne hydrogenation using two reduced Al_(2) O_(3)-supported Pdbased catalysts was carried out in a total recirculation system with an external fixed-bed *** lab-prepared egg-shell NiPd/CeO_(2)-Al_(2) O_(3) catalyst(NiPdCe) with Pd loading=0.5 wt%,Ni/Pd atomic ratio=1 and CeO_(2) loading=3 wt% was synthesized and characterized,and it was compared with an egg-shell Al_(2) O_(3)-supported Pd based commercial catalyst(PdCC).The reduced catalysts were characterized by X-ray diffraction,X-ray photoelectron spectroscopy,and high-resolution transmission electron *** textural characteristics and ammonia temperature-programmed desorption profiles of the fresh(unreduced) catalysts were also *** catalysts show high 1-butyne conversion and selectivity to 1-butene,but the catalysts also present important differences between hydroisomerizing and hydrogenating *** catalyst shows higher capability for hydroisomerization reactions,while the PdCC catalyst exhibits higher hydrogenating *** observed catalytic performances can be interesting for some industrial processes and can provide a guideline for the development of a Pd-based catalyst with specific catalytic properties.

关键词： 1-Butyne Bifunctional catalyst Egg-shell Hydrogenation Hydroisomerization NiPd catalyst

Mesenchymal stem cell-derived exosomes promote neurogenesis and cognitive function recovery in a mouse model of Alzheimer’s disease

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2019年第9期14卷 1626-1634页

作者： Edwin E. Reza-Zaldivar Mercedes A. Hernández-Sapiéns yanet K. Gutiérrez-Mercado Sergio Sandoval-ávila Ulises Gomez-Pinedo Ana L. Márquez-Aguirre Estefanía Vázquez-Méndez Eduardo Padilla-Camberos Alejandro A. Canales-Aguirre Unidad de Evaluation Preclinica Unidad de Biotecnologia Medica y FarmaceuticaCentro de Investigation y Asistencia en Tecnologia y Diseno del Estado de JaliscoGuadalajaraMexico Regenerative Medicine Unit Neuroscience InstituteDepartment of Neurosurgery and NeurologyIdlSSC Health Research Institute of the Hospital Clinico San CarlosMadridSpain

Studies have shown that mesenchymal stem cell-derived exosomes can enhance neural plasticity and improve cognitive *** purpose of this study was to investigate the effects of mesenchymal stem cell-derived exosomes on neurogenesis and cognitive capacity in a mouse model of Alzheimer’s ***’s disease mouse models were established by injection of beta amyloid 1?42 aggregates into dentate gyrus *** water maze and novel object recognition tests were performed to evaluate mouse cognitive deficits at 14 and 28 days after ***,neurogenesis in the subventricular zone was determined by immunofluorescence using doublecortin and PSA-NCAM *** showed that mesenchymal stem cells-derived exosomes stimulated neurogenesis in the subventricular zone and alleviated beta amyloid 1?42-induced cognitive impairment,and these effects are similar to those shown in the mesenchymal stem *** findings provide evidence to validate the possibility of developing cell-free therapeutic strategies for Alzheimer’s *** procedures and experiments were approved by Institutional Animal Care and Use Committee(CICUAL)(approval *** 2016-011)on April 25,2016.

关键词： Alzheimer’s disease neurodegenerative disease cognitive impairment memory Alzheimer’s disease mouse model mesenchymal stem cell exosomes neurogenesis cognitive improvement cell-free therapy neural regeneration

Lifestyle Characterization in Mexican Teenagers: Healthy Weight against Overweight and Obesity

在线全文

学校读者我要写书评

暂无评论

Open Journal of Nursing 2021年第1期11卷 28-41页

作者： Sonia González González Patricia Cruz Bello María de Lourdes García Hernández María Alberta García Jiménez Gabriela yanet Cortés Moreno Facultad de Enfermería y Obstetricia Universidad Autónoma del Estado de México Toluca México Universidad Autónoma Metropolitana México City México Hospital Regional de Alta Especialidad Ixtapaluca Ixtapaluca México

Objective: Currently Mexico is one of the 1st places in overweight and obesity in teenagers;the health and nutrition national survey in 2018, expresses a 41.1% of women in teenager’s population and a 35.8% in men. To analyze teenagers’ lifestyles with healthy weight against overweight and obesity. Method: Descriptive, transverse, analytic and comparative, a non-probabilistic sampling distributed up to convenience in 2 groups of cases and controls, with 50 teenagers diagnosed with overweight and obesity and 50 teenagers with healthy weight, in a 12 to 15 years old age range;for previous informed consent, the survey Health-Promoting Lifestyle Profile II was applied to measure the lifestyles in 6 dimensions. The analysis got a standard deviation and the association of variables U of Mann-Whitney for independent samples. Results: In both teenagers’ groups male gender prevailed with a 76%, the result in teenagers’ group was identified, an average lifestyle with the dimensions of: interpersonal relationships, feeding, physical activity, stress management and spiritual growth and a low level in the dimension of health responsibility. There is a meaningful difference in the variables association in the spiritual growth lifestyle. Conclusions: The evaluation of both groups is similar to an average score;this shows that there is a risk to unleash overweight, obesity and complications in the adult age of the teenager.

关键词： Lifestyle Teenagers Healthy Weight Overweight and Obesity

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

阳离子技术用于苎麻织物提高染色性能的研究

山东科学 1997年第2期10卷 22-25页

作者：刘岩吕家麟王绪科青岛大学纺织服装学院山东省纺织科学研究院山东省科学院分析测试中心

介绍了苎麻织物染色和阳离子改性的机理，重点研究了苎麻阳离子化反应的影响因素和工艺条件，并对不同种类，不同结构的染料，分别进行了常规及阳离子化改性染色实验。

关键词：苎麻织物阳离子化反应染色工艺改性

Productive Response of Brassica rapa *** to Application of VIUSID Agro

在线全文

学校读者我要写书评

暂无评论

Journal of Agricultural Science and Technology(B) 2019年第2期9卷 103-109页

作者： Kolima Pena Calzada Dilier Olivera Viciedo Alexander Calero Juan Carlos Rodríguez Bulent Kukurtcu yanet Milagros Placenciaálvarez Alexei Castro Salas Department of Agronomy Faculty of Agricultural SciencesUniversity of Sancti Spiritus Jose Marti Perez(UNISS)Sancti Spiritus 60100Cuba School of Agricultural and Veterinarian Sciences Sao Paulo State University(UNESP)Jaboticabal 1480Sao PauloBrazil Scientific Department CatalysisS.L.Madrid 28016Spain Department of Mathematics University of Camagüey Ignacio Agramonte LoynazCamagüey 74650Cuba

In order to evaluate the effect of VIUSID agro on the yield response of a pak choi harvest,a randomised block experiment was designed with four treatments and three *** treatments were dosages of 0.1,0.2 and 0.3 L/ha and one *** number of leaves per plant and the fresh and dry mass of the plant were *** addition,growth indexes were evaluated,such as relative growth rate,active growth rate,harvest index and agricultural *** number of leaves per plant was significantly greater at 35 days after sowing(das)for 0.2 L/ha and 0.3 L/ha treatments,with increases of 15.0%and 14.17%relative to the *** plant length and fresh mass at the final evaluation,the treatments using higher dosages produced the best *** the active growth rate,the 0.2 L/ha dosage produced the best effects,and regarding relative growth rate,the 0.2 L/ha and 0.3 L/ha dosages produced the best results relative to the *** harvest index did not benefit from the used dosages,while a higher agricultural yield was achieved using the 0.2 L/ha and 0.3 L/ha dosages at 18.03%and 12.88%compared to the ***,VIUSID agro positively influenced the yield behaviour of pak choi.

关键词： VIUSID agro pak choi amino acids vegetables.