Adrià Barbeta, Sam P. Jones, Laura Clavé, Lisa Wingate, Teresa E. Gimeno, Bastien Fréjaville, Steve Wohl, Jérôme Ogée,
Abstract. We investigated plant water sources of an emblematic refugial population of Fagus sylvatica (L.) in the Ciron river gorges in south-western France using stable water isotopes. It is generally assumed that no isotopic fractionation occurs during root water uptake, so that the isotopic composition of xylem water effectively reflects that of source water. However, this assumption has been called into question by recent studies that found that, at least at some dates during the growing season, ...
Tópico(s): Geology and Paleoclimatology Research
2019 - Copernicus Publications | Hydrology and earth system sciences
Adrià Barbeta, Régis Burlett, Paula Martín, Bastien Fréjaville, Nicolas Devert, Lisa Wingate, Jean‐Christophe Domec, Jérôme Ogée,
Summary The long‐standing hypothesis that the isotopic composition of plant stem water reflects that of source water is being challenged by studies reporting bulk water from woody stems with an isotopic composition that cannot be attributed to any potential water source. The mechanism behind such source–stem water isotopic offsets is still poorly understood. Using a novel technique to extract selectively sap water from xylem conduits, we show that, in cut stems and potted plants, the isotopic composition ...
Tópico(s): Urban Heat Island Mitigation
2021 - Wiley | New Phytologist
Mukundamurari Chakravarty, Amiya B. Kar, A. W. Greenwood,
... are recorded here. The life-history of Eimeria barbeta Kar (1944) is described in detail. We also ...
Tópico(s): Animal Nutrition and Physiology
1945 - Cambridge University Press | Proceedings of the Royal Society of Edinburgh Section B Biology
Barbara L. Barbeta, A.T. Marshall, Amanda D. Gillon, David J. Craik, Marilyn A. Anderson,
Several members of the Rubiaceae and Violaceae plant families produce a series of cyclotides or macrocyclic peptides of 28–37 aa with an embedded cystine knot. The cyclic peptide backbone together with the knotted and strongly braced structure confers exceptional chemical and biological stability that has attracted attention for potential pharmaceutical applications. Cyclotides display a diverse range of biological activities, such as uterotonic action, anti-HIV activity, and neurotensin antagonism. ...
Tópico(s): Phytoplasmas and Hemiptera pathogens
2008 - National Academy of Sciences | Proceedings of the National Academy of Sciences
Miguel Ángel Cárdenas, David García-López, I. Gobernado‐Mitre, J. C. Merino, J. M. Pastor, Juan de Dios Martínez, Javier Barbeta, Daniel Calveras,
Mechanical and flame retardant properties of ethylene vinyl acetate (EVA) copolymer/organoclay/alumina trihydrate (ATH) nanocomposites have been studied. ATH with different particle sizes, ATH1 (2.2–5.2 μm) and ATH2 (1.5–3.5 μm), and three different surface treatments, uncoated, fatty acid coated and silane coated, have been used. A synergistic effect was observed in EVA/organoclay/ATH nanocomposites with the total heat evolved (THE) and the heat release rate (HRR) lower than that of EVA/ATH composite. ...
Tópico(s): Synthesis and properties of polymers
2008 - Elsevier BV | Polymer Degradation and Stability
Produção Nacional
Revisado por pares
A. Franco, Vivien S. Zapf, Vagner Bernal Barbeta, R. F. Jardim,
We have performed a systematic study of the magnetic properties of a series of ferrimagnetic nanoparticles of MgxFe3−xO4 (0.8≤x≤1.5) prepared by the combustion reaction method. The magnetization data can be well fitted by Bloch’s law with T3/2. Bloch’s constant B determined from the fitting procedure was found to increase with Mg content x from ∼3.09×10−5 K−3/2 for x=0.8 to 6.27×10−5 K−3/2 for x=1.5. The exchange integral JAB and the spin-wave stiffness constant D of MgxFe3−xO4 nanoparticles were ...
Tópico(s): Multiferroics and related materials
2010 - American Institute of Physics | Journal of Applied Physics
G A Martín-Henao, Pilar Resano, Janeth Villegas, P. P. Manero, J. Sánchez, Miquel Bosch, A. E. Codins, Miguel Bruguera, Lulette Infante, A. P. Oyarzabal, R. N. Soldevila, D. C. Caiz, Lluís Bosch, E. Contreras Barbeta, J. R. G. Ronda,
The infusion of thawed haematopoietic progenitor cells from apheresis (HPC-A) is associated with minor but frequent adverse reactions (ARs), which has been mainly attributed to dimethyl sulphoxide (DMSO). Nevertheless, other factors may play a role in the pathogenesis of such toxicity.The ARs on a cohort of 423 cryopreserved HPC-A infusions for 398 patients in HPC transplantation program were analysed.ARs were reported in 105 graft infusions (24·8%) and most of them were graded as mild to moderate. ...
Tópico(s): Hemoglobinopathies and Related Disorders
2010 - Wiley | Vox Sanguinis
Produção Nacional
Revisado por pares
Vagner Bernal Barbeta, R. F. Jardim, Pedro K. Kiyohara, Fernando Bacci Effenberger, Liane M. Rossi,
Magnetic nanoparticles (NP) of magnetite (Fe3O4) coated with oleic acid (OA) and dodecanoic acid (DA) were synthesized and investigated through Transmission Electron Microscopy (TEM),magnetization M, and ac magnetic susceptibility measurements. The OA coated samples were produced with different magnetic concentrations (78, 76, and 65%) and the DA sample with 63% of Fe3O4. Images from TEM indicate that the NP have a nearly spherical geometry and mean diameter ~ 5.5 nm. Magnetization measurements, performed ...
Tópico(s): Nanoparticle-Based Drug Delivery
2010 - American Institute of Physics | Journal of Applied Physics
Brendon Conlan, Amanda D. Gillon, Barbara L. Barbeta, Marilyn A. Anderson,
• Premise of the study: The cyclotide kalata B1 is found in the leaves of Oldenlandia affinis and is a potent insecticidal and nematocidal molecule. This peptide is cleaved from a precursor protein, Oak1, and ligation of the N‐ and C‐termini occurs to form a continuous peptide backbone. The subcellular location of the excision and cyclization reactions is unknown, and there is debate as to which enzyme catalyzes the event. To determine where in the plant cell Oak1 is processed, we prepared constructs encoding ...
Tópico(s): Toxin Mechanisms and Immunotoxins
2011 - Wiley | American Journal of Botany
Produção Nacional
F. Cordero, F. Trequattrini, Vagner Bernal Barbeta, R. F. Jardim, M. S. Torikachvili,
Measurements are presented of the complex dynamic Young's modulus of NdNiO${}_{3}$ and Nd${}_{0.65}$Eu${}_{0.35}$NiO${}_{3}$ through the metal-insulator transition (MIT). Upon cooling, the modulus presents a narrow dip at the MIT followed by an abrupt stiffening of $\ensuremath{\sim}$$6%$. The anomaly is reproducible between cooling and heating in Nd${}_{0.65}$Eu${}_{0.35}$NiO${}_{3}$ but appears only as a slow stiffening during cooling in undoped NdNiO${}_{3}$, in conformance with the fact that the ...
Tópico(s): Multiferroics and related materials
2011 - American Physical Society | Physical Review B
Adrià Barbeta, Josep Peñuelas, Romà Ogaya, Alistair S. Jump,
Habitat fragmentation results in smaller and more isolated populations that may be at higher risk of extirpation or further decline in comparison with their more continuously distributed progenitors. Risks to fragmented populations have frequently been considered from the perspective of population genetics, however, disruption of normal plant demography may be an equal or greater threat to population persistence. We compared demographic performance and tree health in continuous and fragmented forest ...
Tópico(s): Forest Ecology and Biodiversity Studies
2011 - Elsevier BV | Forest Ecology and Management
Produção Nacional
Revisado por pares
Vagner Bernal Barbeta, R. F. Jardim, M. S. Torikachvili, M. T. Escote, F. Cordero, F. M. Pontes, F. Trequattrini,
Oxides RNiO3 (R = rare-earth, R ≠ La) exhibit a metal-insulator (MI) transition at a temperature TMI and an antiferromagnetic (AF) transition at TN. Specific heat (CP) and anelastic spectroscopy measurements were performed in samples of Nd1−xEuxNiO3, 0 ≤ x ≤ 0.35. For x = 0, a peak in CP is observed upon cooling and warming at essentially the same temperature TMI = TN ∼ 195 K, although the cooling peak is much smaller. For x ≥ 0.25, differences between the cooling and warming curves are negligible, and two well defined ...
Tópico(s): Multiferroics and related materials
2011 - American Institute of Physics | Journal of Applied Physics
Produção Nacional
Revisado por pares
M. T. Escote, Vagner Bernal Barbeta, R. F. Jardim, Javier Campo,
Polycrystalline Nd 1-x EuxNiO 3 (0 ≤ x ≤ 0.5) compounds were synthesized in order to investigate the character of the metal-insulator (MI) phase transition in this series.Samples were prepared through the sol-gel route and subjected to heat treatments at ∼1000 • C under oxygen pressures as high as 80 bar.X-ray Diffraction (XRD) and Neutron Powder Diffraction (NPD), electrical resistivity ρ(T ), and Magnetization M (T ) measurements were performed on these compounds.The results of NPD and XRD indicated that the samples ...
Tópico(s): Multiferroics and related materials
2006 - IOP Publishing | Journal of Physics Condensed Matter
Mireia Serra, Luis Cirera, Ramón Rami‐Porta, R. Bastús, Sónia González, María Simó, Montserrat Domènech, Enric Barbeta, Jordi Soler, J. Belda,
7031 Background: To evaluate the presence of mediastinal lymph node spread of NSCLC after changing the clinical staging protocol from routine to selective surgical mediastinal exploration (SME) based on PET. Methods: From 1994 to 2003, routine SME (mediastinoscopy, parasternal mediastinotomy or extended cervical mediastinoscopy) was performed to 655 patients (pts) with NSCLC as the last clinical staging procedure prior to thoracotomy. Those with no mediastinal involvement underwent thoracotomy with ...
Tópico(s): Medical Imaging and Pathology Studies
2006 - Lippincott Williams & Wilkins | Journal of Clinical Oncology
Produção Nacional
Revisado por pares
Francisco L.A.F. Gomes, Fabíola Fernandes Heredia, Priscilla Barbeta e Silva, Olivardo Facó, Francisco Campos,
We present here a method for the regeneration of the prickly-pear (Opuntia ficus-indica (L.) Mill.) through somatic embryogenesis (SE). Direct SE was induced by cultivating shoot apices devoid of leaf primordia on semisolid Murashige and Skoog (MS) basal medium supplemented with 4-amino 3,5,6-trichloropicolinic acid (picloram) at 4 mg l−1. Somatic embryogenesis was influenced by the type, age, physiological and developmental stage of the explants, and also by light conditions, wounding, and the sucrose ...
Tópico(s): Seed Germination and Physiology
2006 - Elsevier BV | Scientia Horticulturae
Adrià Barbeta, Romà Ogaya, Josep Peñuelas,
Tópico(s): Ecology and Vegetation Dynamics Studies
2012 - Springer Science+Business Media | Trees
J. A. Stevens, Kerry Dunse, Rosemary F. Guarino, Barbara L. Barbeta, Shelley Evans, Jenny West, Marilyn A. Anderson,
The flowers of the ornamental tobacco produce high levels of a series of 6 kDa serine protease inhibitors (NaPIs) that are effective inhibitors of trypsins and chymotrypsins from lepidopteran species. These inhibitors have a negative impact on the growth and development of lepidopteran larvae and have a potential role in plant protection. Here we investigate the effect of NaPIs on the activity and levels of serine proteases in the gut of Helicoverpa armigera larvae and explore the adaptive mechanisms ...
Tópico(s): Entomopathogenic Microorganisms in Pest Control
2012 - Elsevier BV | Insect Biochemistry and Molecular Biology
Produção Nacional
Revisado por pares
Cristiane Camargo, Rossana Anelice Gomez-Campos, Marco Cossío-Bolaños, Vinícius Justino de Oliveira Barbeta, Miguel de Arruda, Gil Guerra‐Júnior,
The aim was to analyse the physical growth and body composition of rhythmic gymnastics athletes relative to their level of somatic maturation. This was a cross-sectional study of 136 athletes on 23 teams from Brazil. Mass, standing height and sitting height were measured. Fat-free and fat masses, body fat percentages and ages of the predicted peak height velocity (PHV) were calculated. The z scores for mass were negative during all ages according to both WHO and Brazilian references, and that for ...
Tópico(s): Physical Education and Gymnastics
2014 - Taylor & Francis | Journal of Sports Sciences
Romà Ogaya, Adrià Barbeta, Corina Başnou, Josep Peñuelas,
In the framework of climate change, decreased tree growth and enhanced mortality induced by hot and dry conditions are increasing in many forests around the world, and particularly in Mediterranean forests. Our aim was to estimate tree growth and mortality in a Mediterranean holm oak forest, using remote sensing data from MODIS. We monitored annual increases of aboveground biomass by measuring tree basal area, and we determined tree mortality by counting dead stems. We analyzed the relationships ...
Tópico(s): Tree-ring climate responses
2014 - Springer Science+Business Media | Annals of Forest Science
Fung T. Lay, Simon Poon, James A. McKenna, Angela A. Connelly, Barbara L. Barbeta, Bruce S. McGinness, Jennifer L. Fox, Norelle L. Daly, David J. Craik, Robyn L. Heath, Marilyn A. Anderson,
Plant defensins are small (45-54 amino acids), basic, cysteine-rich proteins that have a major role in innate immunity in plants. Many defensins are potent antifungal molecules and are being evaluated for their potential to create crop plants with sustainable disease resistance. Defensins are produced as precursor molecules which are directed into the secretory pathway and are divided into two classes based on the absence (class I) or presence (class II) of an acidic C-terminal propeptide (CTPP) of ...
Tópico(s): Transgenic Plants and Applications
2014 - BioMed Central | BMC Plant Biology
Romà Ogaya, Joan Llusià, Adrià Barbeta, Dolores Asensio, Daijun Liu, Giorgio A. Alessio, Josep Peñuelas,
A long-term experimental drought to simulate future expected climatic conditions for Mediterranean forests, a 15% decrease in soil moisture for the following decades, was conducted in a holm oak forest since 1999. Net photosynthetic rate, stomatal conductance and leaf water potential were measured from 1999 to 2013 in Quercus ilex and Phillyrea latifolia, two co-dominant species of this forest. These measurements were performed in four plots, two of them received the drought treatment and the two ...
Tópico(s): Plant responses to elevated CO2
2014 - Elsevier BV | Plant Science
Adrià Barbeta, Mónica Mejía-Chang, Romà Ogaya, Jordi Voltas, Todd E. Dawson, Josep Peñuelas,
Abstract Vegetation in water‐limited ecosystems relies strongly on access to deep water reserves to withstand dry periods. Most of these ecosystems have shallow soils over deep groundwater reserves. Understanding the functioning and functional plasticity of species‐specific root systems and the patterns of or differences in the use of water sources under more frequent or intense droughts is therefore necessary to properly predict the responses of seasonally dry ecosystems to future climate. We used ...
Tópico(s): Tree-ring climate responses
2014 - Wiley | Global Change Biology
Produção Nacional
Revisado por pares
Fábio Bertapelli, Antônio de Azevedo Barros Filho, Maria Ângela Reis de Góes Monteiro Antônio, Camila Justino de Oliveira Barbeta, Sofia Helena Valente de Lemos‐Marini, Gil Guerra‐Júnior,
The objective of this study was to review the growth curves for Turner syndrome, evaluate the methodological and statistical quality, and suggest potential growth curves for clinical practice guidelines. The search was carried out in the databases Medline and Embase. Of 1006 references identified, 15 were included. Studies constructed curves for weight, height, weight/height, body mass index, head circumference, height velocity, leg length, and sitting height. The sample ranged between 47 and 1, ...
Tópico(s): Sexual Differentiation and Disorders
2014 - Hindawi Publishing Corporation | BioMed Research International
Jofre Carnicer, Adrià Barbeta, Dominik Sperlich, Marta Coll, Josep Peñuelas,
Recent large-scale studies of tree growth in the Iberian Peninsula reported contrasting positive and negative effects of temperature in Mediterranean angiosperms and conifers. Here we review the different hypotheses that may explain these trends and propose that the observed contrasting responses of tree growth to temperature in this region could be associated with a continuum of trait differences between angiosperms and conifers. Angiosperm and conifer trees differ in the effects of phenology in ...
Tópico(s): Plant responses to elevated CO2
2013 - Frontiers Media | Frontiers in Plant Science
Produção Nacional
Revisado por pares
Anderson Márques de Moraes, Ezequiel Moreira Gonçalves, Vinícius Justino de Oliveira Barbeta, Gil Guerra‐Júnior,
The aim of the study was to verify the association between body composition and physical fitness with bone status in children and adolescents.A cross-sectional study was conducted with 300 healthy students (148 boys, 152 girls). Weight, height, fat and fat-free mass, and percentage of body fat (%BF) were evaluated, as were physical fitness (abdominal exercise, flexibility, and horizontal jump tests) and maximum oxygen consumption. Bone parameters (amplitude-dependent speed of sound; AD-SoS) and the Ultrasound ...
Tópico(s): Obesity, Physical Activity, Diet
2013 - BioMed Central | BMC Pediatrics
Adrià Barbeta, Romà Ogaya, Josep Peñuelas,
Abstract Forests respond to increasing intensities and frequencies of drought by reducing growth and with higher tree mortality rates. Little is known, however, about the long‐term consequences of generally drier conditions and more frequent extreme droughts. A Holm oak forest was exposed to experimental rainfall manipulation for 13 years to study the effect of increasing drought on growth and mortality of the dominant species Quercus ilex , Phillyrea latifolia, and Arbutus unedo . The drought treatment ...
Tópico(s): Tree-ring climate responses
2013 - Wiley | Global Change Biology
Josep Peñuelas, Jordi Sardans, Marc Estiarte, Romà Ogaya, Jofre Carnicer, Marta Coll, Adrià Barbeta, Albert Rivas‐Ubach, Joan Llusià, Martín F. Garbulsky, Iolanda Filella, Alistair S. Jump,
Abstract We review the evidence of how organisms and populations are currently responding to climate change through phenotypic plasticity, genotypic evolution, changes in distribution and, in some cases, local extinction. Organisms alter their gene expression and metabolism to increase the concentrations of several antistress compounds and to change their physiology, phenology, growth and reproduction in response to climate change. Rapid adaptation and microevolution occur at the population level. ...
Tópico(s): Atmospheric chemistry and aerosols
2013 - Wiley | Global Change Biology
Laura G. Rico, Romà Ogaya, Adrià Barbeta, Josep Peñuelas,
Rapid genetic changes in plants have been reported in response to current climate change. We assessed the capacity of trees in a natural forest to produce rapid acclimation responses based on epigenetic modifications. We analysed natural populations of Quercus ilex, the dominant tree species of Mediterranean forests, using the methylation-sensitive amplified polymorphism (MSAP) technique to assess patterns and levels of methylation in individuals from unstressed forest plots and from plots experimentally ...
Tópico(s): Plant Water Relations and Carbon Dynamics
2013 - Wiley | Plant Biology
Produção Nacional
Revisado por pares
Fábio Bertapelli, Juan Eduardo Samur‐San Martin, Ezequiel Moreira Gonçalves, Vinícius Justino de Oliveira Barbeta, Gil Guerra‐Júnior,
Growth curves have been developed for individuals with Down syndrome (DS) in several countries. However, in order to facilitate the preparation of clinical guidelines it is necessary to verify the eligibility of these curves. The search was conducted according to the PRISMA method ( Preferred Reporting Items for Systematic reviews and Meta‐Analyses ). It was conducted between July 2012 and June 2013 in MEDLINE/PubMed and BIREME. The inclusion and exclusion criteria were applied to identify the studies ...
Tópico(s): Frailty in Older Adults
2013 - Wiley | American Journal of Medical Genetics Part A
P. Allenspach, B. W. Lee, D. A. Gajewski, Vagner Bernal Barbeta, M. B. Maple, G. Nieva, Sang‐Im Yoo, M. J. Kramer, R. W. McCallum, L. Ben‐Dor,
Tópico(s): Magnetic and transport properties of perovskites and related materials
1995 - Springer Nature | Zeitschrift für Physik B Condensed Matter