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Impact of Zinc Stress on Biochemical and Biophysical Parameters in Coffea Arabica Seedlings
Jacqueline Oliveira dos Santos,Cinthia Aparecida Andrade,Kamila Rezende Dázio de Souza,Meline de Oliveira Santos,Isabel Rodrigues Brandão,Jose Donizeti Alves,Iasminy Silva Santos 한국작물학회 2019 Journal of crop science and biotechnology Vol.22 No.3
Zinc is an essential micronutrient for the healthy development of plants, since its insufficient and supraoptimal doses can disrupt the metabolism and biomass production. We aimed to investigate the physiological responses of coffee seedlings to Zn deficiency and excess. Six-month-old seedlings were transferred to plastic pots containing a nutrient solution. The treatments were control (0.03 ppm), zinc deficiency (0.00 ppm), and zinc excess (0.12 ppm). The evaluations were performed in leaves and roots at the beginning of the treatments and after 30 and 60 d of treatments. Zn deficiency and excess increased the production of hydrogen peroxide, antioxidant enzymes activity, ascorbate, and lipid peroxidation contents. The imbalance in zinc nutrition reduced total chlorophyll content and increased carotenoids content throughout the experimental period. Lower biomass and proline accumulation were observed only for deficient seedlings at the end of the experiment. The characteristics analyzed showed that zinc deficiency caused greater damage to the Coffea arabica plants of (Catuai cultivar) than zinc excess.
Nitrogen Metabolism in Lactating Goats Fed with Diets Containing Different Protein Sources
Santos, A.B.,Pereira, M.L.A.,Silva, H.G.O.,Pedreira, M.S.,Carvalho, G.G.P.,Ribeiro, L.S.O.,Almeida, P.J.P.,Pereira, T.C.J.,Moreira, J.V. Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.5
This study aimed to evaluate urea excretion, nitrogen balance and microbial protein synthesis in lactating goats fed with diets containing different protein sources in the concentrate (soybean meal, cottonseed meal, aerial part of cassava hay and leucaena hay). Four Alpine goats whose mean body weight was $42.6{\pm}6.1kg$ at the beginning of the experiment, a mean lactation period of $94.0{\pm}9.0days$ and a production of $1.7{\pm}0.4kg$ of milk were distributed in a $4{\times}4$ Latin square with four periods of 15 days. Diets were formulated to be isonitrogenous, containing 103.0 g/kg of CP, 400 g/kg of Tifton 85 hay and 600 g/kg of concentrate. Diet containing cottonseed meal provided (p<0.05) increased excretion of urea and urea nitrogen in the urine (g/d and mg/kg of BW) when compared with leucaena hay. The diets affected the concentrations of urea nitrogen in plasma (p<0.05) and excretion of urea nitrogen in milk, being that soybean meal and cottonseed meal showed (p<0.05) higher than the average aerial part of the cassava hay. The use of diets with cottonseed meal as protein source in the concentrate in feeding of lactating goats provides greater nitrogen excretion in urine and negative nitrogen balance, while the concentrate with leucaena hay as a source of protein, provides greater ruminal microbial protein synthesis.
Synthesis and Characterization of Dense Ceramic Membranes for Methane Conversion - Part II
Santos A.,Fontes V.A.,Fontes F.A.Oliveira,De Sousa J.F.,De Souza C.P. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
The perovskite- type oxide containing transition metals on the B-site show mixed (electronic/ionic) conductivity. These mixed-conductivity oxides are promising materials for oxygen permeating membranes. The main objective of this research work is to synthesize and characterization ceramic powders of the Sr-Co-Fe-O system for methane conversion using membrane reactor. SCFO powders were synthesized from the route was based on the complex method of combination of acid EDTA and citrate and shown be available by control efficient of synthesis to performed , moreover, it presented easy implementation, reproducibility and operation. Powder ceramic was characterized by XRD, microscopic optic, SEM and TG-DTA.
Rice Iron Metabolism: from Source to Solution
Santos, Livia Scheunemann dos,Oliveira, Antonio Costa de The Korean Society of Crop Science 2007 Journal of crop science and biotechnology Vol.10 No.2
Iron is an important micronutrient for plants. Iron metabolism is a complex mechanism under a delicate balance. Iron metabolism represents two major problems for plants: deficiency as a consequence of solubility problems and toxicity due to excess solubility in anaerobic conditions. In the last few years, new genes have been discovered that influence iron uptake, transport and storage. Irrigated rice is exposed to high levels of $Fe^{II}$, normally rare in aerobic soil conditions. The implications of altering iron uptake rates and the effects of newly discovered genes are discussed.
Santos Ingrid Garcia,Ramos de Faria Fernanda,da Silva Campos Marcio José,de Barros Beatriz Álvares Cabral,Rabelo Gustavo Davi,Devito Karina Lopes 대한영상치의학회 2023 Imaging Science in Dentistry Vol.53 No.2
Purpose: The objective of this study was to assess the fractal dimension, lacunarity, trabecular microarchitecture parameters, and cortical linear measurements in the mandibles of male and female individuals to identify differences between them. Materials and Methods: In total, 116 cone-beam computed tomography scans of healthy individuals of different ages (57 men and 59 women, aged between 20 and 60 years) were selected. The following bone parameters were measured: 1) buccal, lingual, and basal cortical bone thickness in 5 standard parasagittal sections (the midline, the left and right sides of the lower lateral incisors, and the left and right sides of the lower canines); 2) the bone volume fraction of 10 sequential axial sections from each patient by creating a volume of interest in the area between the lower canines; and 3) fractal dimension and lacunarity using grayscale images of the same region of the volume of interest in the anterior mandible. Spearman correlation coefficients and the Mann-Whitney test were used. Results: A significant and positive correlation was found between age and cortical thickness, especially in the region of the central incisors. Significant differences between sexes in terms of fractal dimension, lacunarity, and bone volume were found. Women revealed lower fractal dimension values and higher lacunarity and bone volume ratio values than men. Conclusion: Fractal dimension, lacunarity, trabecular bone volume, and cortical thickness were different between men and women of different ages.
Optical and Structural Properties of Emerging Dilute III-V Bismides
Santos, B.H. Bononi Dos,Gobatoa, Y. Galvao,Heninib, M. The Korean Vacuum Society 2014 Applied Science and Convergence Technology Vol.23 No.5
In this paper, we present a review of optical and structural studies of $GaBi_xAs_{1-x}$ epilayers grown by Molecular Beam Epitaxy (MBE) on (311)B and (001) GaAs substrates with different As fluxes. The results indicate that under near-stoichiometric conditions the bismuth incorporation is higher for samples grown on (311)B GaAs substrates than for those grown on (001) GaAs. In addition, carrier localization effects in GaBiAs layers are clearly revealed for both samples by optical measurements. The (311)B samples showed evidence of higher density of defects. It has also been found that the nonradiative centers play a significant role in the recombination process in this material system. The influence of post-growth annealing on the microstructural, optical, and magneto-optical properties was also investigated. An important improvement of optical and spin properties after thermal annealing due to the reduction of defects in the GaBiAs layers was observed.