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Hydrogen sulfide:A novel component in Arabidopsis peroxisomes which triggers catalase inhibition

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journal of Integrative Plant Biology 2019年第7期61卷 871-883页

作者： Francisco j.Corpas juan B.Barroso salvador Gonzalez-Gordo maria A.munoz-Vargas j.se m.palma Group of Antioxidants Free Radicals and Nitric Oxide in BiotechnologyFood and AgricultureDepartment of BiochemistryCell and Molecular Biology of PlantsEstacion Experimental del ZaidfnCSICC/Profesor Albareda 1E-18008 GranadaSpain Group of Biochemistry and Cell signaling in Nitric oxide Department of Biochemistry and Molecular BiologyCampus"Las Lagunillas"E-23071University of JaenJaenSpain

Plant peroxisomes have the capacity to gen erate different reactive oxygen and nitrogen species(ROs and RNs),such as H2O2,superoxide radical(O2^·-),nitric oxide and peroxynitrite(ONOO^-).These organelles have an active nitrooxidative metabolism which can be exacerbated by adverse stress *** sulfide(H2s)is a new signaling gasotransmitter which can mediate the posttranslational modification(PTm)*** used Arabidopsis thaliana transgenic seedlings expressing cyan fluorescent protein(CFP)fused to a canonical peroxisome targeting signal 1(PTs1)to visualize peroxisomes in living cells,as well as a specific fluorescent probe which showed that peroxisomes contain H2s.H2s was also detected in chloroplasts under glyphosate-induced oxidative stress *** enzyme activities,including catalase,photorespiratory H2O2-generating glycolate oxidase(GOX)and hydroxypyruvate reductase(HPR),were assayed in vitro with a H2s *** line with the persulfidation of this enzyme,catalase activity declined significantly in the presence of the H2s *** corroborate the inhibitory effect of H2s on catalase activity,we also assayed pure catalase from bovine liver and pepper fruit-enriched samples,in which catalase activity was *** together,these data provide evidenee of the presence of H2s in plant peroxisomes which appears to regulate catalase activity and,consequently,the peroxisomal H2O2 metabolism.

关键词： Hydrogen sulfide triggers catalase inhibition

Nitric oxide and hydrogen sulfide share regulatory functions in higher plant events

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BIOCELL 2022年第1期46卷 1-5页

作者： FRANCIsCO j.CORPAs sALVADOR GONZÁLEZ-GORDO mARTA RODRÍGUEZ-RUIZ mARÍA A.mUÑOZ-VARGAs j.sém.palma Group of Antioxidants Free Radicals and Nitric Oxide in BiotechnologyFood and AgricultureDepartment of BiochemistryCell and Molecular Biology of PlantsEstación Experimental del Zaidín(Spanish National Research CouncilCSIC)Granada18008Spain

Nitric oxide(NO)and hydrogen sulfide(Hs)are two molecules that share signaling properties in plant and animal cells NO and H2s originate two farmilies of de rived mol ecules designated reactive nitrogen and sulfur species(RNs and Rss,respectively).These molecules are responsible for certain protein regulatory processes through posttranslational modifications(PTms),being the most remarkable s nitrosation and persufidation,which afect the thiol group of cysteine *** and H2s can also exert regulatory functions due to their interaction through the iron present in proteins that contain heme groups or iron-sulfur dlusters,as reported mainly in animal ***,the available information in plant cells is still very limited thus *** higher plants,NO and H2s are involved in a myriad of physiological events from seed germination to fruit ripening,but also the mec hanism of response to biotic and abiotic stress *** vie wpoint manuscript highlights the functional regulatory parllelism of these two molecules which also interact with the metabolism of reactive oxygen species(ROs)in plant cells.

关键词： Ascorbate peroxidase Hydrogensulfide Nitricoxide Persulfidation s-nitrosation signaling

Lithographically directed assembly of one-dimensional DNA nanostructures via bivalent binding interactions

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Nano Research 2013年第6期6卷 409-417页

作者： Risheng Wang matteo palma Erika Penzo shalom j. Wind Department of Applied Physics and Applied mathematics Columbia University 500 West 120th Street New York NY 10027 USA Department of Chemistry Columbia University 500 West 120th Street New York NY 10027 USA

In order to exploit the outstanding physical properties of one-dimensional （1D） nanostructures such as carbon nanotubes and semiconducting nanowires and nanorods in future technological applications, it will be necessary to organize them on surfaces with precise control over both position and orientation. Here, we use a 1D rigid DNA motif as a model for studying directed assembly at the molecular scale to lithographically patterned nanodot anchors. By matching the inter-nanodot spacing to the length of the DNA nanostructure, we are able to achieve nearly 100% placement yield. By varying the length of single-stranded DNA linkers bound covalently to the nanodots, we are able to study the binding selectivity as a function of the strength of the binding interactions. We analyze the binding in terms of a thermodynamic model which provides insight into the bivalent nature of the binding, a scheme that has general applicability for the controlled assembly of a broad range of functional nanostructures.

关键词： directed assembly bivalent interactions DNA nanostructures 1D nanostructures

Engineered biomimicry for harvesting solar energy:a bird’s eye view

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International journal of smart and Nano materials 2013年第2期4卷 83-90页

作者： Raúl j.martín-palma Akhlesh Lakhtakia materials Research Institute The Pennsylvania State UniversityUniversity ParkPA 16802USA Department of materials science and Engineering The Pennsylvania State UniversityUniversity ParkPA 16802USA Department of Engineering science and mechanics The Pennsylvania State UniversityUniversity ParkPA 16802USA

All three methodologies of engineered biomimicry–bioinspiration,biomimetics,and bioreplication–are represented in current research on harvesting solar *** processes and porous surfaces inspired by plants and certain marine animals,respectively,are being investigated for solar *** dye-sensitized solar cells deploy artificial photosynthesis,bioinspired nanostructuring of materials in solar cells improves *** textured coatings for solar cells have been shown to reduce optical reflectance and increase optical absorptance over a broad spectral *** lenses fabricated by a bioreplication technique offer similar promise for reduced reflectance by increasing the angular field of view.

关键词： bioinspiration biomimetics bioreplication solar cell artificial photosynthesis antireflective coating engineering biomimicry

Phase separation and coarsening of NiAl(β′)intermetallic in quench-aged Fe-Ni-Al alloys

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journal of Iron and steel Research International 2020年第11期27卷 1331-1338页

作者： C.Ferreira-palma j.A.Rosas-Barrios V.m.Lopez-Hirata D.I.Rivas-Lopez H.j.Dorantes-Rosales Faculty of Chemical sciences Universidad VeracruzanaVeracruz 94294Mexico EsIQIE Instituto Politecnico Nacional.UPALMMexico City 07738Mexico

The coarsening behavior of four quench-aged Fe-Ni-AI alloys with different Ni and Al con tents is *** alloys were solubilized at 1100℃for 24 h,water-quenched and aged at 850℃for periods ranging from 1 to 100 h to promote phase separation and *** two alloys with the highest combined Ni and Al contents(>35 at.%)showed signs of spinodal decomposition,while the alloys with lower Ni and Al contents followed a classical nucleation *** Ni and Al contents promoted an increase in NiAl(β′)phase fraction in concordance with phase equilibrium *** alloy with the highest[3'fraction presented a completely interconnected *** coarsening ofβ′particles in the other three alloys followed the predictions of the Lifshitz-slyozov-Wagner(LsW)*** general trend was an increase in the coarsening kinetics with higher Ni and Al *** highest hardness was found in the alloys with higher fraction albeit these compositions are less resistant to coarsening and have been reported to present a low room-temperature ductility.

关键词： Precipitation spinodal decomposition Coarsening Aging Fe-Ni-Al alloy

Fabrication of Polymeric Visual Decoys for the male Emerald Ash Borer （Agrilus planipennis）

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journal of Bionic Engineering 2013年第2期10卷 129-138页

作者： Drew P. Pulsifer Akhlesh Lakhtakia mahesh s. Narkhede michael j. Domingue Beverly G. Post jayant Kumar Raul j. martln-palma Thomas C. Baker Department of Engineering science & mechanics Pennsylvania State University University Park Pennsylvania 16802 USA Center for Advanced materials and Department of Plastics Engineering University of Massachusetts Lowell Lowell MA 01854 USA Department of Entomology Pennsylvania State University University Park PA 16802 USA Center for Advanced materials and Department of Physics & Applied Physics University of Massachusetts Lowell Lowell MA 01854 USA Department of materials science & Engineering Pennsylvania State University University Park Pennsylvania 16802 USA

Through a bioreplication approach, we have fabricated artificial visual decoys for the invasive species Agrilus planipen- nis--commonly known as the Emerald Ash Borer （EAB）. The mating behavior of this species involves an overflying EAB male pouncing on an EAB female at rest on an ash leaflet before copulating. The male spots the female on the leaflet by visually detecting the iridescent green color of the female＇s elytra. As rearing EAB and then deploying dead females as decoys for trapping is both arduous and inconvenient, we decided to fabricate artificial decoys. We used a dead female to make a negative die of nickel and a positive die of epoxy. Decoys were then made by first depositing a quarter-wave-stack Bragg reflector on a polymer sheet and then stamping it with a pair of matched negative and positive dies to take the shape of the upper surface of an EAB female. As nearly 100 artificial decoys were fabricated from j.st one EAB female, this bioreplication process is industrially scalable. Preliminary results from a field trapping test are indicative of success.

关键词： bioreplication conformal-evaporated-film-by-rotation method electroforming negative die positive die stampingCopyright ~ 2013 jilin University. Published by science Press and Elsevier Limited. All rights reserved.

manipulation of parasite load induces significant changes in the structural-based throat color of male iberian green lizards

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Current Zoology 2018年第3期64卷 293-302页

作者： Rodrigo mEGiA-palma javier mARTiNEZ santiago mERINO Dept Ecologia Evolutiva Museo Nacional de Ciencias Naturales-CSIC J. Gutierrez Abascal 2 E-28006 Madrid Spain Area Parasitologia Dept Biomedicina y Biotecnologia Area de Parasitologia. Facultad de Farmacia Universidad de Alcala de Henares Alcala de Henares E-28871 Madrid Spain

The honesty of structural-based ornaments is controversial. sexual selection theory predicts that the honesty of a sexual signal relies on its cost of production or maintenance. Therefore, environmental factors with negative impact on individuals could generate high costs and affect the expres- sion of these sexual signals. In this sense, parasites are a main cost for their hosts. To probe the effect of parasites on the structural-based coloration of a lacertid species Lacerta schreiberi, we have experimentally removed ticks from a group of male Iberian green lizards using an acaricide treatment （i.e., the broad-use insecticide fipronil）. All individuals were radio-tracked and recaptured after 15 days to study changes in coloration in both the ultraviolet （UV）-blue （structural-based） and UV-yellow （structural and pigment-based） ornamentations after manipulation, as well as changes in endoand ectoparasitic load and body condition. Additionally, after the experiment, we measured the skin inflammatory response to a mitogen. The fipronil treatment was effective in reducing ticks and it was associated with a significant reduction of hemoparasite load. Throughout the season, individuals treated with fipronil tended to maintain the brightness of the UV-blue throat coloration while control lizards tended to increase it. However, individuals treated with fipronil that were not infected with hemoparasites significantly reduced the brightness of the UV-blue throat color ation. Individuals with a higher initial tick load exhibited a lower UV saturation increment （UV-blue） and a higher brightness increment （UV-yellow） during the experiment. Overall these results experimentally support the idea that parasites adversely influence the expression of the structural-based coloration of male Iberian green lizards. This adds evidence to the hypothesis that sexual ornaments in lizards function as honest signals.

关键词： animal communication ectoparasites Hamilton & Zuk structural-coloration.

Opposed elevational variation in prevalence and intensity of endoparasites and their vectors in a lizard

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Current Zoology 2018年第2期64卷 197-204页

作者： Lola ALVAREZ-RUIZ Rodrigo mEGIA-palma senda REGUERA santiago Rulz Francisco j. ZAmORA-CAmACHO jordi FIGUEROLA Gregorio mORENO-RUEDA Centro de Investigaciones sobre Desertificacion-CsIC Ctra. Naquera Kin. 4.5 Moncada Valencia E-46113 Spain Departarnento de Ecologia Evolutiva Museo Nacional de Ciencias Naturales-CSIC c/Jose Gutierrez Abascal Madrid E-28006 Spain Unit of Ethology and Animal Welfare Faculty of Veterinary University CEU Cardenal Herrera Alfara del Patriarca (Valencia) E-46113 Spain servicio de Control de mosquitos DiputaciGn Provincial de Huelva Centro de InvestigaciGn Biornedica en Red Epidemiologia y Salud Publica (CIBERESP) Huelva Spain CIBER de Epidemiologia y salud Peblica (CIBEREsP) Spain Departamento de Biogeografia y Carnbio Global Museo Nacional de Ciencias Naturales-CSIC C/Jose Gutierrez Abascal 2 Madrid E-28006 Spain Departarnento de Ecologia de Hurnedales Estacion Biologica de Dofiana-CSIC c/Americo Vespucio s/n Sevilla E-41092 Spain Departamento de Zoologia Facultad de Ciencias Universidad de Granada Granada E-18071 Spain

studying the causes of parasite geographic distribution is relevant to understand ecological and evolutionary processes that affect host populations as well as for species conservation. Temperature is one of the most important environmental variables affecting parasite distribution, as raising temperatures positively affect development, reproduction, and rate of transmission of both endo- and ectoparasites. In this context, it is generally accepted that, in mountains, parasite abundance decreases with elevation. However, empirical evidence on this topic is limited. In the present study, we analyzed the elevational variation of hemoparasites and ectoparasites of a lizard, Psammodromus algirus, along a 2,200-m elevational gradient in sierra Nevada （sE spain）. As pre- dicted, ectoparasite （mites, ticks, mosquitoes, and sandflies） abundance decreased with elevation. However, hemoparasite prevalence and intensity in the lizard augmented with altitude, showing a pattern contrary to their vectors （mites）. We suggest that tolerance to hemoparasites may increase with elevation as a consequence of lizards at high altitudes taking advantage of increased body condition and food availability, and reduced oxidative stress. moreover, lizards could have been selected for higher resistance against hemoparasites at lowlands （where higher rates of replication are expected）, thus reducing hemoparasite prevalence and load. Our findings imply that, in a scen- ario of climate warming, populations of lizards at high elevation may face increased abundance of ectoparasites, accompanied with strong negative effects.

关键词： elevation immune system parasite distribution Psammodromus algirus reptile

The effects of an experimental drought on the ecophysiology and fruiting phenology of a tropical rainforest palm

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journal of Plant Ecology 2020年第6期13卷 744-753页

作者： Nara O.Vogado michael j.Liddell susan G.W.Laurance mason j.Campbell Alexander W.Cheesman jayden E.Engert Ana C.palma Françoise Y.Ishida Lucas A.Cernusak Centre for Tropical Environmental and sustainability science College of Science and EngineeringJames Cook UniversityCairnsAustralia College of Life and Environmental sciences University of ExeterExeter EX44RJDevonUK

Aims Anthropogenic climate change is predicted to increase mean temperatures and rainfall *** tropical rainforest species will respond to this climate change remains ***,we analysed the effects of a 4-year experimental throughfall exclusion(TFE)on an Australian endemic palm(Normambya normanbyi)in the Daintree rainforest of North Queensland,*** aimed to understand the impact of a simulated reduction in rainfall on the species’physiological processes and fruiting *** We examined the fruiting phenology and ecophysiology of this locally abundant palm to determine the ecological responses of the species to *** water availability was reduced overall by~30%under a TFE experiment,established in may *** monitored monthly fruiting activity for 8 years in total(2009–2018),including 4 years prior to the onset of the *** the most recent year of the study,we measured physiological parameters including photosynthetic rate,stomatal conductance and carbon stable isotopes(δ13C,an integrated measure of water use efficiency)from young and mature leaves in both the dry and wet *** Findings We determined that the monthly fruiting activity of all palms was primarily driven by photoperiod,mean solar radiation and mean ***,individuals exposed to lower soil moisture in the TFE decreased significantly in fruiting activity,photosynthetic rate and stomatal *** found that these measures of physiological performance were affected by the TFE,season and the interaction of the *** of fruiting activity in the TFE palms was observed in 2018,when there was an increase in shallow soil moisture compared with previous years in the *** findings suggest that palms,such as the ***,will be sensitive to future climate change with long-term monitoring recommended to determine population-scale impacts.

关键词： climate change water use efficiency stable isotopes seasonality reproductive phenology