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Photosynthetic Regulation of the Cyanobacterium Synechocystis sp. PCC 6803 Thioredoxin System and Functional Analysis of TrxB （Trx x） and TrxQ （Trx y） Thioredoxins

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Molecular Plant 2009年第2期2卷 270-283页

作者： M. Esther Perez-Perez eugenio Martin-Figueroa francisco J. Florencio Instituto de Bioquimica Vegetal y Fotosintesis Universidad de Sevilla-CSIC Avda Americo Vespucio 49 41092-Sevilla Spain

The expression of the genes encoding the ferredoxin-thioredoxin system including the ferredoxin-thioredoxin reductase （FTR） genes ftrC and ftrV and the four different thioredoxin genes trxA （m-type; sir0623）, trxB （x-type; sir1139）, trxC （sll1057） and trxQ （y-type; sir0233） of the cyanobacterium Synechocystis sp. PCC 6803 has been studied according to changes in the photosynthetic conditions. Experiments of light-dark transition indicate that the expression of all these genes except trxQ decreases in the dark in the absence of glucose in the growth medium. The use of two electron transport inhibitors, 3-（3,4-dichlorophenyl）-1,1-dimethylurea （DCMU） and 2,5-dibromo-3-methyl-6-isopropyl-p- benzoquinone （DBMIB）, reveals a differential effect on thioredoxin genes expression being trxC and trxQ almost unaffected, whereas trxA, trxB, and the ftr genes are down-regulated. In the presence of glucose, DCMU does not affect gene expression but DBMIB still does. Analysis of the single TrxB or TrxQ and the double TrxB TrxQ Synechocystis mutant strains reveal different functions for each of these thioredoxins under different growth conditions. Finally, a Synechocystis strain was generated containing a mutated version of TrxB （TrxBC34S）, which was used to identify the potential in-vivo targets of this thioredoxin by a proteomic analysis.

关键词： Cyanobacteria photosynthetic electron transport Synechocystis oxidative stress thioredoxin.

A coupled fluid FEM-DEM technique for predicting blasting operations in tunnels

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Underground Space 2018年第4期3卷 310-316页

作者： francisco Zarate Jose M.Gonzalez Juan Miquel Rainald Lohner eugenio Onate Centre Internacional de Metodes Numerics en Enginyeria(CIMNE) Spain Universitat Politecnica de Catalunya(UPC) Gran Capitan s/nCampus Nord08034 BarcelonaSpain George Mason University USA1

We present recent developments in the coupling of the finite element method(FEM)and the discrete element method(DEM)for the analysis of rock blasting operations in tunnels.The coupled FEM-DEM technique has been proven to be an efficient procedure for pre-dicting the multiple fractures of rock induced by the loads generated in blasting.The coupled FEM-DEM procedure is applied in tunnel construction,as well as to gas pressure blasting pyrotechnics to break rocks for the excavation of the tunnel front.In the latter case,the effect of gas explosion is modeled by solving the equations of gas dynamics in the analysis domain using FEM.The effect of gas forces in the underlying rock mass is modeled via an embedded fluid-structure interaction method.The efficiency of the coupled FEM-DEM tech-nique is demonstrated in several examples of fracture tests and rock blasting problems related to tunnel engineering.The examples pre-sented indicate that the combination of the DEM with simple three-node linear triangular elements(for two-dimensional problems)captures the onset of fractures and their evolution accurately,accounting for the penetration of gas in the failure domain(Zarate&Onate,2015;Zarate,Cornejo,&Onate,2018).

关键词： Discrete elements Finite elements Fracture mechanics FEM-DEM Gas dynamics

In Vitro Propagation of Agave guiengola Gentry Using Semisolid Medium and Temporary Immersion Bioreactors

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Phyton-International Journal of Experimental Botany 2021年第3期90卷 1003-1013页

作者： Lucía Isabel Chávez-Ortiz Joséfrancisco Morales-Domínguez Araceli Rodríguez-Sahagún eugenio Pérez-Molphe-Balch Departamento de Química Centro de Ciencias BásicasUniversidad Autónoma de AguascalientesAguascalientes20131México Laboratorio de Biología Molecular Vegetal Centro Universitario de la CiénegaUniversidad de GuadalajaraOcotlán47820México

Agave guiengola Gentry is an endemic plant from a very small locality in Oaxaca,Mexico.Its conservation status is fragile and can rapidly worsen.Because of its scarcity,this agave has been used solely for ornamental purposes,but it could have other uses if more plants were available.In vitro propagation by enhanced axillary sprouting from stem segments was attained using Murashige and Skoog Basal Medium(MS)as well as basal medium supplemented with cytokinins 6-Benzylaminopurine(BA)or 6-(γ,γ-Dimethylallylamino)purine(2iP).The best treatment for shoot induction in semisolid medium consisted in MS supplemented with 2 mg l^(–1) BA,obtaining a mean of 3.7 shoots per explant.Other interesting responses were observed,such as nodular callus induction using combinations of BA and 2,4-Dichlorophenoxyacetic acid(2,4-D);root induction without Plant Growth Regulators(PGR);and generation of shoot clusters.These clusters constituted an excellent explant for micropropagation in temporary immersion bioreactors,obtaining a propagation rate of 43 shoots per explant with 1 min immersion and 6 h immersion frequencies.All new plants rooted and survived the transfer to soil.This study developed an in vitro propagation scheme to produce individuals that can be used either for reforestation,economical purposes,or to carry out studies in this species to assess its full potential,avoiding exploitation from wild plants.

关键词： Agavaceae temporary immersion systems callus induction micropropagation

In Vitro Propagation, Isolation and Expression Studies of Suaeda edulis Genes Involved in the Osmoprotectants Biosynthesis

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Phyton-International Journal of Experimental Botany 2020年第3期89卷 715-726页

作者： Gloria Viviana Cerrillo-Rojas Mariana Tiscareno-Andrade Ana Erika Ochoa-Alfaro eugenio Perez-Molphe Balch Ruth Elena Soria-Guerra Jose francisco Morales-Dominguez Departamento de Quimica Universidad Autonoma de AguascalientesCentro de Ciencias BasicasCiudad UniversitariaAguascalientes20131Mexico Facultad de Quimica Universidad Autonoma de San Luis PotosiZona UniversitariaSan Luis Potosi78210Mexico

Halophytes are an excellent choice for the study of genes conferring salt tolerance to salt-sensitive plants and,they are suitable for reclamation and remediation of saline soil.We develop an in vitro plant propagation protocol and studies of genes involved with GB and Pro biosynthesis in Suaeda edulis.Axillary buds were used as explants and cultured in different treatments on Murashige and Skoog(MS)medium supplemented with different concentrations and combinations of plant growth regulators.The highest number of multiple shoots was on MS medium containing 1 mg/L Benzyladenine(BA)and/or 2 g/L activated carbon with 5.5±06 shoots per explant.The identification and expression analysis of genes involved in glycine betaine(GB)biosynthesis were S-adenosyl-methionine synthetase(SAMS),choline monooxygenase(CMO)and betaine alde-hyde dehydrogenase(BADH),and for proline(Pro)was pyrroline 5-carboxylate synthetase(P5CS).These sequences shared 90–95%of identity with others plant homologous in public databases.The amino acids sequence analysis showed that all these peptides contain some of the conserved motifs of those kinds of enzymes.The qRT-PCR analysis revealed a higher expression of SeBADH,SeCMO,and,SeP5CS genes in the roots and leaves from plants collected in the field in contrast with from in vitro plants.However,the expression level of SeSAMS was higher only in the leaves of plants collected in the field when com-pared to those cultivated in vitro.

关键词： Axillary buds halophyte proline glycine betaine salt-resistant

Loiasis in sub-Saharan migrants living in Spain with emphasis of cases from Equatorial Guinea

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Infectious Diseases of Poverty 2020年第1期9卷 82-89页

作者： Sabino Puente German Ramírez-Olivencia Mar Lago Mercedes Subirats francisco Bru eugenio Pérez-Blazquez Marta Arsuaga Concepción Ladron de Guevara Fernando de la Calle-Prieto Belén Vicente Montserrat Alonso-Sardón Moncef Belhassen-Garcia Antonio Muro Unidad de Medicina Tropical.Servicio de Medicina Interna.Hospital La Paz-Carlos III MadridSpain Unidad de Aislamiento de Alto Nivel.Sección de Enfermedades Infecciosas.Servicio de Medicina Interna.Hospital Central de la Defensa Gómez Ulla MadridSpain Microbiología.Hospital La Paz-Carlos III MadridSpain Dermatología MadridSpain Servicio de Oftalmología.Hospital Universitario 12 de Octubre Universidad Complutense de MadridMadridSpain Laboratorio de Inmunología Parasitaria y Molecular.CIETUS.IBSAL Facultad de FarmaciaUniversidad de SalamancaAvenida Donantes de Sangre s/n37007 SalamancaSpain Área de Medicina Preventiva y Salud Pública IBSALCIETUSUniversidad de SalamancaSalamancaSpain Servicio de Medicina Interna.Sección de Enfermedades Infecciosas.CAUSA.IBSAL.CIETUS Universidad de SalamancaPaseo San Vicente 58-18237007 SalamancaSpain

Background:Loiasis is an uncommon and poorly understood parasitic disease outside endemic areas of Africa.The aim of this study was to describe the clinical and biological patterns and treatment of imported loiasis by sub-Saharan migrants diagnosed in Madrid,Spain.Methods:A retrospective study was conducted with sub-Saharan immigrants seen at the Tropical Medicine Unit of the Carlos III Hospital in Madrid,Spain,a reference center,over 19 years.Categorical variables were expressed as frequency counts and percentages.Continuous variables were expressed as the mean and standard deviation(SD)or median and interquartile range(IQR:Q3–Q1).Chi-square tests were used to assess the association between categorical variables.The measured outcomes were expressed as the odds ratio(OR)with a 95%confidential interval.Continuous variables were compared by Student’s t-tests or Mann-Whitney U tests.Binary logistic regression models were used.P<0.05 was considered a statistically significant difference.Results:One hundred thirty-one migrants from tropical and subtropical areas with loiasis were identified.Forty-nine patients were male(37.4%).The migrants’mean age(±SD)was 42.3±17.3 years,and 124(94.7%)were from Equatorial Guinea.The median time(IQR)between arrival in Spain and the first consultation was 2(1–7)months.One hundred fifteen migrants had eosinophilia,and one hundred thirteen had hyper-IgE syndrome.Fifty-seven patients had pruritus(43.5%),and thirty patients had Calabar swelling(22.9%).Seventy-three patients had coinfections with other filarial nematodes(54.2%),and 58 migrants had only Loa loa infections(45.8%).One hundred two patients(77.9%)were treated;45.1%(46/102)patients were treated with one drug,and 54.9%(56/102)patients were treated with combined therapy.Adverse reactions were described in 14(10.7%)migrants.Conclusions:Our patients presented early clinical manifestations and few atypical features.Thus,physicians should systematically consider loiasis in migrants with a typical presentation.However,considering that 7

关键词： Loa loa Loiasis Tropical medicine Clinical study Immigrant Imported disease Spain

Adaptation to Long-Term Rainfall Variability for Robusta Coffee Cultivation in Brazilian Southeast

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American Journal of Climate Change 2018年第4期7卷 487-504页

作者： Lima Deleon Martins Fernando Coelho eugenio Wagner Nunes Rodrigues Sebastiao Vinicius Batista Brinati Tafarel Victor Colodetti Bruno Fardim Christo Dionicio Belisario Luis Olivas Fabio Luiz Partelli Jose francisco Teixeira do Amaral Marcelo Antonio Tomaz Jose Domingos Cochicho Ramalho Alexandre Rosa dos Santos Center of Agrarian Sciences and Engineering Federal University of Espirito Santo—CCAE/UFESAlegreBrazil Geotechnology Applied to Global Environment—CNPq Advanced Research Group—GAGEN AlegreBrazil Federal University of Santa Maria Santa MariaBrazil Jose Faustino Sanchez Carrion National University HuachoPeru North University Center Federal University of Espirito Santo—CUNES/UFESSao MateusBrazil Plant-Environment Interactions&Biodiversity Lab(Plant Stress&Biodiversity) Linking LandscapeEnvironmentAgriculture and Food(LEAF)Dept.Recursos NaturaisAmbiente e Territorio(DRAT)Instituto Superior de Agronomia(ISA)Universidade de Lisboa(ULisboa)Quinta do MarquesOeirasPortugal

Coffee is one of the world most traded agricultural commodities. Currently, a lot of attention has been on Robusta coffee (Coffea canephora Pierre ex A. Froehner) because it seems to evidence a greater tolerance to extreme climatic events than Arabica coffee (C. arabica L.). Despite this, only a few works have been developed aimed at discriminating the climatic vulnerability in regions which prioritize robust coffee production. The aim of this work was to analyze historical climatic variables in space and time for the characterization of climatic vulnerability of micro-regions, in search of mitigation and adaptation, which might support the improvement of production systems of C. canephora coffee trees. The case study was carried out for one of the largest production regions of Robusta coffee of the world, in Brazil, geographically located between the 39°38' and 41°50' West longitude meridians and the 17°52' and 21°19' South latitude parallels. The vulnerability was characterized by the spatial and temporal variation of rainfall and rainfall seasonal pattern (based on 30 years of historical data), elements of climatic water balance, elevation and area planted with Robusta coffee. The choice of mitigation and adaptation were based on widely validated criteria. Overall, the results show that the vulnerability of Robusta coffee is related to low index of rainfall, the rainfall seasonability and the water deficiency. In the studied region, there is approximately 42% of some type of water vulnerability during the year, with a severe to medium scale;this vulnerability is very pronounced in regions farther away from the coast of the Atlantic Ocean, since for a year approximately 92% of them are water deficient. In addition, the data show that this distance from the ocean implies a reduction of 75% in the phases of water surplus not only. The strategies of greater potential for adaptation and mitigation are related to the planting of improved genotypes, utilization of polycultures systems, increasing plant density, the i

关键词： Coffea canephora Rainfall Climate Change Shade Irrigation