Fano interference and a slight fluctuation of the Majorana hallmark

Conselho Nacional de Desenvolvimento Cient��fico e Tecnol��gico (CNPq)

Effects of potassium and sodium supply on drought-adaptive mechanisms in Eucalyptus grandis plantations

Funda����o de Amparo �� Pesquisa do Estado de S��o Paulo (FAPESP)

Carbohydrate production and transport in cotton cultivars grown under boron deficiency

An adequate supply of boron (B) is required for the optimal growth and development of cotton (Gossypium hirsutum L.) plants, but the low phloem mobility of B limits the possibilities of correcting B deficiency. There are indications that different cotton cultivars could have different responses to B deficiency. The differences in responses of cotton cultivars to B regarding photoassimilate production and transport were studied in a greenhouse experiment with nutrient solution. Treatments consisted of three cotton cultivars (FMT 701, DP 604BG and FMX 993) and five concentrations of B (0.0, 2.5, 5.0, 10.0 and 20.0 mu mol L-1). Sampling began at the phenological stage B1 (first square) and continued for four weeks. The leaf area and the number of reproductive branches and structures decreased due to B deficiency. A higher level of abortion of reproductive structures was observed under B deficiency. Boron deficiency increased the internal CO2 concentration but decreased the transpiration rate, stomatal conductance and photosynthesis. Despite the decrease in photosynthesis, nonstructural carbohydrates accumulated in the leaves due to decreased export to bolls in B-deficient plants. The response to B deficiency is similar among cotton cultivars, which shows that the variability for this trait is low even for cultivars with different genetic backgrounds.

Respostas fisiol��gicas de cultivares de cana-de-a����car submetidas �� defici��ncia h��drica e a reidrata����o

The aim of this work was to study the physiological responses of three contrasting cultivars of sugar cane subject to water stress and rewatering, The experiment was carried out in a greenhouse, where the cultivars SP83-2847, SP80-1842 and SP81-3250 were grown in pots. The first assessment was done after 85 days of planting, then two treatments were implemented, i.e. without water stress (-D) and with water stress (+D) by withholding water for 15 days and rewatering imposed for 12 days after the stress period. Cultivars SP81-3250 and SP80-1842 showed a higher decline in the F-v/F-m ratio, leaf relative water content (RWC), leaf water potential (Psi(w)), SPAD index and photosynthetic pigments due to water deficit. Drought caused less damage in the physiology of the variety SP83-2847, and it still showed rapid recovery during rewatering, including for the stomatal conductance (gs), so this variety had better adaptation under this condition. The traits F-v/F-m, Psi(w), RWC, SPAD index and photosynthetic pigments present as potential physiological indicators in order to select tolerant sugar cane cultivars to water deficit. The trait gs is more effective in differentiating the tolerant cultivars during rewatering.

Do litter manipulations affect leaf functional traits of savanna woody plants?

Conselho Nacional de Desenvolvimento Cient��fico e Tecnol��gico (CNPq)

Subtle leakage of a Majorana mode into a quantum dot

Conselho Nacional de Desenvolvimento Cient��fico e Tecnol��gico (CNPq)

��ndice SPAD e trocas gasosas ao longo do dia para diferencia����o de cana-de-a����car sob defici��ncia h��drica

P��s-gradua����o em Agronomia (Agricultura) - FCA

Physiological changes in eucalyptus hybrids under different irrigation regimes

Funda����o de Amparo �� Pesquisa do Estado de S��o Paulo (FAPESP)

The ecophysiological performance of Vernonia polyanthes Less. (Asteraceae) in conserved and degraded forests in the Brazilian Cerrado

Conselho Nacional de Desenvolvimento Cient��fico e Tecnol��gico (CNPq)

Morphological effects of flooding on Styrax pohlii and the dynamics of physiological responses during flooding and post-flooding conditions

Coordena����o de Aperfei��oamento de Pessoal de N��vel Superior (CAPES)

Gas sensor applications of zinc oxide thin film grown by the polymeric precursor method

Conselho Nacional de Desenvolvimento Cient��fico e Tecnol��gico (CNPq)

Investigation of Bulk and DTMOS triple-gate devices under 60 MeV proton irradiation

Conselho Nacional de Desenvolvimento Cient��fico e Tecnol��gico (CNPq)

Stretching of BDT-gold molecular junctions: thiol or thiolate termination?

It is often assumed that the hydrogen atoms in the thiol groups of a benzene-1,4-dithiol dissociate when Au-benzene-1,4-dithiol-Au junctions are formed. We demonstrate, by stability and transport property calculations, that this assumption cannot be made. We show that the dissociative adsorption of methanethiol and benzene-1,4-dithiol molecules on a flat Au(111) surface is energetically unfavorable and that the activation barrier for this reaction is as high as 1 eV. For the molecule in the junction, our results show, for all electrode geometries studied, that the thiol junctions are energetically more stable than their thiolate counterparts. Due to the fact that density functional theory (DFT) within the local density approximation (LDA) underestimates the energy difference between the lowest unoccupied molecular orbital and the highest occupied molecular orbital by several electron-volts, and that it does not capture the renormalization of the energy levels due to the image charge effect, the conductance of the Au-benzene-1,4-dithiol-Au junctions is overestimated. After taking into account corrections due to image charge effects by means of constrained-DFT calculations and electrostatic classical models, we apply a scissor operator to correct the DFT energy level positions, and calculate the transport properties of the thiol and thiolate molecular junctions as a function of the electrode separation. For the thiol junctions, we show that the conductance decreases as the electrode separation increases, whereas the opposite trend is found for the thiolate junctions. Both behaviors have been observed in experiments, therefore pointing to the possible coexistence of both thiol and thiolate junctions. Moreover, the corrected conductance values, for both thiol and thiolate, are up to two orders of magnitude smaller than those calculated with DFT-LDA. This brings the theoretical results in quantitatively good agreement with experimental data.

Effect of inter-adatoms correlations on the local density of states of graphene

Conselho Nacional de Desenvolvimento Cient��fico e Tecnol��gico (CNPq)

Overexpression of the activated form of the AtAREB1 gene (AtAREB1 Delta QT) improves soybean responses to water deficit

Coordena����o de Aperfei��oamento de Pessoal de N��vel Superior (CAPES)