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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.
Santos, Inê,s C.,Smuts, Jonathan,Choi, Woo-Sik,Kim, Younghoon,Kim, Seoung Bum,Schug, Kevin A. Elsevier 2018 Talanta Vol.182 No.-
<P><B>Abstract</B></P> <P>The identification of microorganisms is very important in different fields and alternative methods are necessary for a rapid and simple identification. The use of fatty acids for bacterial identification is gaining attention as phenotypic characteristics are reflective of the genotype and are more easily analyzed. In this work, gas chromatography-vacuum ultraviolet spectroscopy (GC-VUV) was used to determine bacteria fatty acid methyl esters (FAMEs), to identify and discriminate different environmental bacteria based on their fatty acid profile. Microorganisms were grown in agar and their fatty acids extracted, saponified, and esterified before analysis. Unique FAME profiles were obtained for each microorganism mainly composed of branched, cyclopropane, hydroxy, saturated, and unsaturated fatty acid methyl esters. <I>S. maltophilia</I> showed a higher diversity of fatty acids while <I>Bacillus</I> species showed higher complexity in terms of branched-chain FAMEs, with several <I>iso</I> and <I>anteiso</I> forms. 12 different bacteria genera and 15 species were successfully differentiated based on their fatty acid profiles after performing PCA and cluster analysis. Some difficult to differentiate species, such as <I>Bacillus</I> sp., which are genetically very similar, were differentiated with the developed method.</P> <P><B>Highlights</B></P> <P> <UL> <LI> GC-VUV of FAMEs can effectively differentiate a wide range of environmental bacteria. </LI> <LI> A fast method for FAMEs is featured; chromatographic resolution can be sacrificed for spectral resolution. </LI> <LI> Multivariate statistical methods indicate high classification accuracy. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Fourier-Based PLL Applied for Selective Harmonic Estimation in Electric Power Systems
Santos, Claudio H.G.,Ferreira, Reginaldo V.,Silva, Sidelmo Magalhaes,Cardoso Filho, Braz J. The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.5
In this paper, the Fourier-based PLL (Phase-locked Loop) is introduced with a new structure, capable of selective harmonic detection in single and three-phase systems. The application of the FB-PLL to harmonic detection is discussed and a new model applicable to three-phase systems is introduced. An analysis of the convergence of the FB-PLL based on a linear model is presented. Simulation and experimental results are included for performance analysis and to support the theoretical development. The decomposition of an input signal in its harmonic components using the Fourier theory is based on previous knowledge of the signal fundamental frequency, which cannot be easily implemented with input signals with varying frequencies or subjected to phase-angle jumps. In this scenario, the main contribution of this paper is the association of a phase-locked loop system, with a harmonic decomposition and reconstruction method, based on the well-established Fourier theory, to allow for the tracking of the fundamental component and desired harmonics from distorted input signals with a varying frequency, amplitude and phase-angle. The application of the proposed technique in three-phase systems is supported by results obtained under unbalanced and voltage sag conditions.
Santos, Ilyn L.,Lee, Ju-Young,Youm, Yujin,Lim, Jinkyu Institute of Agricultural Science and Technology 2013 慶北大農學誌 Vol.31 No.2
Nuts are one of the most common sources of allergies in individuals of all ages. In order for a particular protein to render an allergic reaction, it must resist proteolytic digestion by intestinal enzymes. In this study, three well-known allergenic nuts, almonds, cashew nuts, and peanuts, were used as samples, and enzyme digestion with Bacillus protease and porcine pepsin was tested. A proteomic approach using two-dimensional gel electrophoresis and an MS/MS analysis was applied to visualize and identify the proteins that were resistant to enzyme digestion. Among the 150 protein spots tested, 42 proteins were assigned functions. Due to the lack of genomic databases, 41% of the identified proteins were grouped as hypothetical. However, 12% of them were well-known allergens, including AraH. The remainder were grouped as storage, enzymes, and binding proteins.
Endophytic Fungi as a Source of Biofuel Precursors
( Santos Fo Florisvaldo C. ),( Taicia Pacheco Fill ),( Joanita Nakamura ),( Marcos Roberto Monteiro ),( Edson Rodrigues Fo ) 한국미생물 · 생명공학회 2011 Journal of microbiology and biotechnology Vol.21 No.7
Endophytic fungi, isolated from a number of different species of tropical plants, were investigated for lipid biodiesel precursor production. The extracts produced from liquid cultures of these fungi were subjected to acidcatalyzed transesterification reactions with methanol producing methyl esters and then analyzed through chromatographic (GC-FID) and spectrometric techniques (MS, NMR ¹H). The European Standard Method, EN 14103, was used for the quantification of methyl esters extracted from the fungi of the species and genera studied. Xylariaceous fungi exhibited the highest concentrations of methyl esters (91%), and hence may be a promising source for biofuel.
Elastic Buckling Assessment of Doubly Symmetric I-Beams with Singly Stepped Section at Midspan
Santos. Ralph Raymond V.,Kang Jun Suk,Park Jong Sup 한국방재학회 2017 한국방재학회논문집 Vol.17 No.6
최근 스텝보의 설계기준 활용성을 향상시키기 위한 여러 연구가 진행된바 있다. 그러나 지간 중앙에 스텝단면이 보강된 I형보의 횡-비틀림 좌굴에 대한 연구는 제한적이었다. 본 연구는 지간 중앙에 스텝보가 적용된 I형보에 하중고 효과와 다양한 하중을 고려한 횡-비틀림 탄성좌굴강도를 평가하고자 한다. 범용유한요소해석 프로그램 ABAQUS가 사용되었으며, 쉘 요소인 S4R요소를 모델링에 적용되었고 해석결과는 기존 설계기준 및 기 발표된 제안식과도 비교분석 되었다. 본 논문은 다양한 표와 그림을 활용하여 해석결과를 나타내고 있으며, 해석연구 비교분석을 통하여 새로운 설계식 제안되었다. Over the years, several studies have been made for the improvement of the design criteria of stepped beams. However, studies on lateral-torsional buckling of stepped beams located at the midspan have been very limited. Hence, this study aims to evaluate the elastic lateral-torsional buckling strength of doubly symmetric singly stepped I-beam at midspan considering the load-height effect and various loading conditions. To model and perform the analysis for the I-beams, a universal finite element analysis program, ABAQUS, will be used. In addition, S4R elements will be used to model the simply supported beams where loads are applied at shear center and at top flange, and to check the accuracy of the models guide design specifications are used. The results from the finite element analysis will be shown using tables and illustrative figures. Based from the obtained results, conclusions and new design guidelines are proposed.
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.