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Sudden openings and gradual closures in canopy cover modulate acclimation,survival,and growth of a shade-tolerant rainforest tree species

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Journal of Forestry Research 2024年第5期35卷 78-90页

作者： Ana Paula Moretti Flavia yesica Olguin Juan Marcelo Gauna Corina Graciano INFIVE(CONICET-Universidad Nacional de La Plata) Diagonal 113 N°4951900 La PlataProvincia de Buenos AiresArgentina CONICET Godoy Cruz 2290C1425FQB Buenos AiresArgentina Facultad de Ciencias Agrariasy Forestales Universidad Nacional de La PlataCalle 60y 1181900 La PlataProvincia de Buenos AiresArgentina Facultad de Ciencias Forestales Universidad Nacional de MisionesBertoni 124 km 33380 EldoradoProvincia de MisionesArgentina

Forest disturbances at gap levels are one of the most important events for the regeneration and establishment of intermediate tree *** canopy openings expose plants to high light intensity and high evaporative demands that stress shade-acclimated ***,the slow closure of gaps reduces light availability to plants established when the incident irradiation was *** work evaluated the morphological and physiological acclimation of Cabralea canjerana(Vell)*** to sudden and to gradual changes in canopy cover.A pot experiment was carried out with plants exposed to a sudden opening.A few days after the light shock,plants rapidly increased photosynthetic rates and decreased leaf water *** two months,plants activated physiological responses at leaf and whole plant levels to high light and water stresses,e.g.,increased stoma-tal conductance,stomatal index and reduction of leaf:fine roots ratio and *** seven months,hydraulic conductivity of petioles and the whole leaf increased,and growth was much higher than plants that remained under the *** a field experiment in gaps in the rainforest,plants acclimated to all canopy *** years after planting,growth was maximum in open environments within the gaps,even if the canopy closed during the first 20 months after *** conclusion,if this species is planted to enrich the rainforest,positions within gaps with lower canopy cover should be chosen and gap closure will not affect *** manage *** natural regeneration,the opening of gaps and removal of understory will increase survival and growth without the risk that the stress caused by these sudden openings could lead to the death of ***-bining pot and field experiments helps to understand the autecology of trees with particular ecological interest,and to build sound restoration practices.

关键词： Cabralea canjerana Atlantic forest Abiotic stress Regeneration Seedling

A cleaner production strategy for acid mine drainage prevention of waste rock:A porphyry copper case

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International Journal of Mining Science and Technology 2024年第8期34卷 1163-1177页

作者： yesica L.Botero Isabelle Demers Luis A.Cisternas ArnoldoÁvila Mostafa Benzaazoua Departamento de Ingeniería Química y Procesos de Minerales Universidad de AntofagastaAntofagasta1240000Chile Research Institute on Mines and Environment Universitédu Québec en Abitibi-TémiscamingueRouyn-NorandaQC J9X5E4Canada Eriez Flotation Group Chile S.A. Santiago1240000Chile Geology and Sustainable Mining Institute University Mohammed Ⅵ PolytechnicLot 660 Hay Moulay RachidBen Guerir 43150Morocco

An in-process technology approach is proposed to identify the source of acid mine drainage(AMD)generation and prevent its formation in a porphyry copper waste rock(WR).Adopting actions before stockpiling the WR enables the establishment of potential contaminants and predicts the more convenient method for AMD prevention.A WR sample was separated into size fractions,and the WR’s net acidgenerating potential was quantified using chemical and mineralogical *** diameter of physical locking of sulfides(DPLS)was determined,and the fractions below the DPLS were desulfurized using ***,the WR fractions and tailing from the flotation test were submitted to acid-base accounting and weathering tests to evaluate their acid-generating *** show that the WR’s main sulfide mineral is pyrite,and the DPLS was defined as 850μm.A sulfide recovery of 91%was achieved using a combination of HydroFloat^(®)and Denver cells for a size fraction lower than *** grinding was *** results show that size fractions greater than DPLS and the desulfurized WR are unlikely to produce *** outcomes show that in-processing technology can be a more proactive approach and an effective tool for avoiding AMD in a porphyry copper WR.

关键词： Waste rock Porphyry copper ore Desulfurization Acid mine drainage HydroFloat^(®) In-process technology Cleaner production

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Temporal aiming

Light(Science & Applications) 2020年第1期9卷 741-752页

作者： Victor Pacheco-pena Nader Engheta School of Mathematics Statistics and PhysicsNewcastle UniversityNewcastle Upon Tyne NE17RUUK Department of Electrical and Systems Engineering University of PennsylvaniaPhiladelphiaPA 19104USA

Deflecting and changing the direction of propagation of electromagnetic waves are needed in multiple applications,such as in lens-antenna systems,point-to-point communications and *** this realm,metamaterials have been demonstrated to be great candidates for controlling wave propagation and wave-matter interactions by offering manipulation of their electromagnetic properties at *** have been studied mainly in the frequency domain,but their temporal manipulation has become a topic of great interest during the past few years in the design of spatiotemporally modulated artificial *** this work,we propose an idea for changing the direction of the energy propagation of electromagnetic waves by using time-dependent metamaterials,the permittivity of which is rapidly changed from isotropic to anisotropic values,an approach that we call temporal *** so doing,here,we show how the direction of the Poynting vector becomes different from that of the *** scenarios are analytically and numerically evaluated,such as plane waves under oblique incidence and Gaussian beams,demonstrating how proper engineering of the isotropic-anisotropic temporal function of ε_(r)(t)can lead to a redirection of waves to different spatial locations in real time.

关键词： anisotropic wave oblique

Adipose-derived mesenchymal stem/stromal cells:from the lab bench to the basic concepts for clinical translation

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BIOCELL 2018年第3期42卷 67-77页

作者： yesica Romina FRONTINI-LóPEZ Aldana Daniela GOJANOVICH Diego MASONE Diego Martín BUSTOS Marina UHART Laboratorio de Integración de Señles Celulares.IHEM-CONICET Universidad Nacional de Cuyo MendozaArgentina Facultad de Ingeniería Universidad Nacional de CuyoMendozaArgentina Facultad de Ciencias Exactas y Naturales Universidad Nacional de CuyoMendozaArgentina

In the last years,much work has shown that the most effective repair system of the body is represented by stem cells,which are defined as undifferentiated precursors that own unlimited or prolonged self-renewal ability,which also have the potential to transform themselves into various cell types through *** tissues that form the body contain many different types of somatic cells,along with stem cells that are called‘mesenchymal stem(or stromal)cells’(MSC).In certain circumstances,some of these MSC migrate to injured tissues to replace dead cells or to undergo differentiation to repair *** discovery of MSC has been an important step in regenerative medicine because of their high ***,the finding of a method to isolate MSC from adipose tissue,so called‘adipose-derived mesenchymal stem cells’(ASC),which share similar differentiation capabilities and isolation yield that is greater than other MSC,and less bioethical concerns compared to embryonic stem cells,have created self-praised publicity to procure almost any treatment with ***,we review the current techniques for isolation,culture and differentiation of human ASC(hASC),and describe them in *** also compile some advantages of the hASC over other stem cells,and provide some concepts that could help finding strategies to promote their therapeutic efficiency.

关键词： hASC Tissue regeneration Cell therapy

An Architecture for Software Engineering Gamification

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Tsinghua Science and Technology 2020年第6期25卷 776-797页

作者： Oscar Pedreira Felix Garcia Mario Piattini Alejandro Cortinas Ana Cerdeira-pena the Universidade da Coruna Centro de Investigacion CITICLaboratorio de Bases de DatosFacultade de InformaticaElvinaA Coruna15071Spain the Universidad de Castilla-La Mancha Grupo AlarcosEscuela Superior de InformaticaPaseo de la Universidad4Ciudad Real13071Spain.

Gamification has been applied in software engineering to improve quality and results by increasing people’s motivation and engagement.A systematic mapping has identified research gaps in the field,one of them being the difficulty of creating an integrated gamified environment comprising all the tools of an organization,since most existing gamified tools are custom developments or *** this paper,we propose a gamification software architecture that allows us to transform the work environment of a software organization into an integrated gamified environment,i.e.,the organization can maintain its tools,and the rewards obtained by the users for their actions in different tools will mount *** developed a gamification engine based on our proposal,and we carried out a case study in which we applied it in a real software development *** case study shows that the gamification engine has allowed the company to create a gamified workplace by integrating custom-developed tools and off-the-shelf tools such as Redmine,TestLink,or JUnit,with the gamification *** main advantages can be highlighted:(i)our solution allows the organization to maintain its current tools,and(ii)the rewards for actions in any tool accumulate in a centralized gamified environment.

关键词： gamification software engineering gamification architecture gamification engine

Small molecules to prevent the neurodegeneration caused by α-synuclein aggregation

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Neural Regeneration Research 2020年第12期15卷 2260-2261页

作者： Samuel pena-Díaz Jordi Pujols Salvador Ventura Institut de Biotecnologia i Biomedicina Departament de Bioquímica i Biologia MolecularUniversitat Autònoma de BarcelonaBellaterraSpain

Parkinson’s disease (PD) is a neurodegenerative disorder belonging to a group of human pathologies known as synucleinopathies,which includes multiple system atrophy or dementia with Lewy bodies (Spillantini et al.,1998).These diseases share a common neuropathological feature,the presence ofα-synuclein (α-Syn) deposits,although they differ in the cellular and anatomical compartment in whichα-Syn inclusions *** affects more than 1% of people over 60 years of age,thus being the second most prevalent neurodegenerative disease in the world and the most common synucleinopathy.

关键词： al. diseases atrophy

Three-Dimensional Angular Momentum Projected Relativistic Point-Coupling Approach for Low-Lying Excited States in ^24Mg

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Chinese Physics Letters 2008年第10期25卷 3609-3612页

作者：尧江明孟杰 D. pena Arteaga P. Ring School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 Physik-Department der Technischen Universitat Munchen D-85748 Garching Germany Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator Lanzhou 730000

A tull three-dimensional angular momentum projection on top ot a triaxial relativistic mean-fieid calculation is implemented for the first time. The underlying Lagrangian is a point coupling model and pairing correlations are taken into account by a monopole force. This method is applied for the low-lying excited states in ^24Mg. Good agreement with the experimental data is found for the ground state properties. A minimum in the potential energy surface for the 22^＋ state, with β≈ 0.55,7 γ≈ 10^o, is used as the basis to investigate the rotational energy spectrum as well as the corresponding B（E2） transition probabilities as compared to the available data.

关键词： the power-law exponents precipitation durative abrupt precipitation change

Monocyte-secreted Wnt5a interacts with FZD5 in microvascular endothelial cells and induces angiogenesis through tissue factor signaling

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Journal of Molecular Cell Biology 2014年第5期8卷 380-393页

作者： Gemma Arderiu Sonia Espinosa Esther pena Rosa Aledo Lina Badimon Cardiovascular Research Center (CSIC-ICCC) Institut d'Investigaci6 Biomedica Sant Pau (llB-Sant Pau) and Universitat Autonoma de Barcelona (UAB)Barcelona 08025 Spain

Angiogenesis during reactive and pathologic processes is characteristically associated with inflammation. Inflammatory cells partici- pate in angiogenesis by secreting different molecules that affect endothelial celt functions. We had previously shown that induced tissue factor （TF） expression in activated rnicrovascular endothelial celts （rn EC） is able to induce angiogenesis via autocrine regulation. However, the signals that induce TF expression in mEC are not fully known. Here, we demonstrate that rnonocyte paracrine cross-talk with mECs triggers rnEC-TF expression. We have identified that rnonocyte-secreted Wnt5a induces TF expression in rnEC and function-ally induces celt rnonolayer repair and angiotube formation in vitro as well as rnicrovesset formation in vivo. Monocyte-secreted Wnt5a activates FZD5 in mECs, which signals to induce the release of intraceUular Ca2＋ and increase NFKB transcription activity and TF gene expression. In sum, WntSa secreted by monocytes signals through the noncanonical Wnt-FZD5 pathway in mECs to induce TF expression that induces angiogenesis by autocrine regulation.

关键词： wnt5a tissue factor microvascular endothelial cells monocytes angiogenesis

Metabolic enzymes in seasonally acclimatized and cold acclimated rufous-collared sparrow inhabiting a Chilean Mediterranean environment

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Current Zoology 2014年第3期60卷 338-350页

作者： Isaac pena-VILLALOBOS Monica NUNEZ-VILLEGAS Francisco BOZINOVIC Pablo SABAT Departamento de Ciencias Ecologicas Facultad de Ciencias Universidad de Chile Casilla 653 Santiago Chile Departamento de Ecologia and Center of Applied Ecology & Sustainability (CAPES) Facultad de Ciencias Biol6gicas Pontificia Universidad Cat61ica de Chile Santiago 6513677 Chile

Due to the higher energy requirements of birds during winter, it is predicted that the activities of metabolic enzymes （e.g., citrate synthase, CS and cytochrome C oxidase, COX） should increase in tandem with increases in rates of energy expendi ture （e.g., basal metabolic rate, BMR）. However, there is mixed support for the hypothesis of enzymatic acclimatization. Fur thermore, there is little information about the effect of ambient temperature on energetics and tissue enzyme activity levels in passerines inhabiting seasonal Mediterranean environments. In this study we evaluated the interplay between BMR and enzyme activities of freshly caught individuals of the passerine Zonotrichia capensis in winter and summer in a Mediterranean environment from central Chile, and also in warm （30℃） and cold （15℃） labacclimated birds. The results revealed a lack of seasonal variation in BMR, thermal conductance and in the activity of CS and COX. However, we found higher BMR and lower thermal conductance in coldacclimated than in warmacclimated birds. Also, total CS activity was higher in the flight muscles of coldacclimated than in warmacclimated birds. We found also a significant correlation between BMR and total CS activity in pectoral muscle. Although some authors have suggested that BMR mainly depends on the metabolic intensity and mass of internal organs, our results revealed that skeletal muscles such as the flight muscles may also affect BMR. Finally, differences in the accli mation and acclimatization responses in Rufouscollared sparrows suggest that largescale oscillations in the physical environment might maintain the capacity for flexibility in thermogenic traits through generations .

关键词： Basal metabolic rate Citrate synthase Cytochrome C oxidase Phenotypic flexibility Thermal acclimation,Zonotrichia capensis