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Physiological Effect of Kinetin on the Photosynthetic Apparatus and Antioxidant Enzymes Activities During Production of Anthurium

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Horticultural Plant Journal 2018年第5期4卷 182-192页

作者： de MOURA Fabiana B. vIEIRA Marcos R. da S. SIMOES Adriano do N. FERREIRA-SILvA Sérgio L. de souza carlos a.v. de souza Eduardo S. da ROCHA Alexandre T. da SILvA Luzia F. JUNIOR Miguel A. Faculty of Agronomy Federal University of Pará Postgraduate Program in Plant Production Serra Talhada Academic UnitFederal Rural University of Pernambuco department of Production vegetable Unidade Academica de GaranhusFederal Rural University of Pernambuco

The results observed in the literature raise the hypothesis according to which cytokinin plays important roles in photosynthetic metabolisms and antioxidant enzymes. Thus, the study aimed to evaluate the effect of foliar application of the isolated cytokinin kinetin at the production cycle, seeking to analyze its effects on enzyme activity and photosynthetic parameters. The plants treated with CK presented reduction of leaf CO_2 assimilation rate(Pn) and stomatal conductance(Gs), while that transpiration rate(Tr) was unaffected. The internal CO_2 concentrations decreased with the increase in cytokinin levels, but were maintained under CK 50 mg·L^(-1). The plants treated with CK 75 mg·L^(-1) was verified higher carboxylation efficiency(Pn/Ci), which was associated to values of CO_2 assimilation and transpiration unaltered. Apparent electron transport rate showed variations in the concentration of 25 mg·L^(-1). Considering the study of enzyme activity, on the other hand, it cannot be stated that kinetin has an effective action in delaying oxidative damage. It presents mixed results, since an efficiency in the application of cytokinin was not observed, presenting induction levels of ascorbate peroxidase activity. Thus, further research is needed to determine more precisely the effects of kinetin on gas exchange and antioxidant enzymes in anthurium plants.

关键词： anthurium kinetin photosynthesis senescence plant hormone oxidative stress

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a.v.ncing healthcare through laboratory on a chip technology:Transforming microorganism identification and diagnostics

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World Journal of Clinical Cases 2025年第3期13卷 9-19页

作者： carlos M Ardila department of Basic Sciences Biomedical Stomatology Research GroupUniversidad de Antioquia U de AMedellín 0057Colombia

In a recent case report in the World Journal of Clinical Cases,emphasized the crucial role of rapidly and accurately identifying pathogens to optimize patient treatment ***-on-a-chip(LOC)technology has emerged as a transformative tool in health care,offering rapid,sensitive,and specific identification of *** editorial provides a comprehensive overview of LOC technology,highlighting its principles,a.v.ntages,applications,challenges,and future *** studies from the field have demonstrated the practical benefits of LOC devices in clinical diagnostics,epidemiology,and food *** studies have underscored the superiority of LOC technology over traditional methods,showcasing improvements in speed,accuracy,and *** future integration of LOC with biosensors,artificial intelligence,and data analytics promises further innovation and *** call to action emphasizes the importance of continued research,investment,and adoption to realize the full potential of LOC technology in improving healthcare outcomes worldwide.

关键词： Laboratory-on-a-chip Microorganism identification Diagnostics Point-ofcare testing Biosensors

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Authigenic titanite in weathered basalts: Implications for paleoatmospheric reconstructions

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Geoscience Frontiers 2020年第6期11卷 2183-2196页

作者： Alexey A.Novoselov Dailto Silva carlos Roberto de souza Filho Institute of Applied Economic Geology Universidad de ConcepcionConcepcionChile Institute of Geosciences University of CampinasCampinasSPBrazil

The stability of titanite is sensitive to temperature and partial pressure of *** finding of authigenic titanite grains in weathering regolith formed on Parana basalts,Brazil,under tropical climatic conditions,reveals the thermodynamically-driven conversion from calcite to titanite at elevated ambient *** unusual nowadays,this phase transition provides important implications for the understanding of silicate weathering in earlier geological *** types of secondary titanites were identified in the weathering profile of the study *** tiny grains of 10 μm are forming in the microscopic voids in the ***,large fractures filled with Fe-rich clay minerals contain bigger specimens of up to 170μ*** titanites of second type often coexist with chalcedony and *** carbonate minerals were found in the weathering *** sphene can be discriminated from other titanite types by its strong positive Eu anomaly,increased Al2 O3 content and low content of trace *** specific chemical composition and reactive transport modeling link this secondary mineral with dissolution of *** titanite precipitation is controlled by slow diffusion in poorly-aerated,highly-alkaline pore *** subaerial weathering of basaltic rocks provides a significant reservoir for atmospheric ***,the deposition of carbonate minerals is thermodynamically avoided at the stability field of *** demonstrate a complex feedback between CO2 and soil *** rise in pCO2 triggers the precipitation of calcite in the weathering regolith,but the greenhouse effect increasing the temperature can cease carbonate *** titanites were found in several paleosols and at least a part of them can be of weathering origin.

关键词： Titanite Sphene Calcite Paleosols Weathering Paleoclimates

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A numerical assessment of two geometries for reducing elbow erosion

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Particuology 2020年第2期18卷 117-133页

作者： carlos Antonio Ribeiro Duarte Francisco Joséde souza Diego Nei venturi Martin Sommerfeld department of Engineering Federal University of Goiás-Regional Catal(a)oAv.Dr.Lamartine Pinto de Avelar1120Catal(a)oGoiásBrazil School of Mechanical Engineering Federal University of Uberl(a)ndiaAv.Joāo Naves de(A)vila2121 Bloco 5PUberl(a)ndiaMinas GeraisBrazil Multiphase Flow Systems(MPS) Otto-von-Guericke-University MagdeburgZeppelinstraβe 1D-06130 Halle(Saale)Germany

Elbows in pneumatic conveying systems are normally prone to the erosive effects of conveyed *** are a number of solutions available to reduce such damage.A widely used geometric alternative for replacing the 90°elbow and reducing erosive wear is the plugged *** option,although less commonly used,is the vortex-chamber *** both cases,the effective reduction in erosion brought about is unclear,as it strongly depends on the operating *** present study assesses relative erosion among the plugged tee,vortex-chamber elbow,and standard elbow for a dilute gas-solid multiphase flow.A numerical model is employed to predict the penetration ratio and validated using experimental data for the plugged *** are run for the standard and vortex-chamber elbows and plugged tee under the same conditions to compare the mechanics involved and the relative erosion *** analysis uses variables relating to particle-wall interactions(impact angle,impact velocity,impact frequency)to illustrate the nature of the erosive process in each pipe *** general,the geometric configurations of both the plugged tee and vortex-chamber elbow promote changes in particle dynamics that reduce the rate of *** the basis of the relative erosion of the standard elbow,the plugged tee proves to be an interesting option in cases of a low mass loading,while the vortex-chamber elbow demonstrates its erosion reduction potential for higher mass loading ***,the a.v.ntages and disa.v.ntages of each fitting are highlighted.

关键词： Relative erosion Plugged tee Erosion reduction Pipe fitting Computational fluid dynamics

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Effect of rare-earth oxides on properties of silicon nitride obtained by normal sintering and sinter-HIP

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Journal of Rare Earths 2012年第11期30卷 1177-1183页

作者： Cecilia C.Guedes-Silva Flávio Machado de souza Ca.v.lho José carlos Bressiani Nuclear and Energy Research Institute-IPEN/CNEN Geoscience Institute-IGC/USP

This paper presented the microstructure, mechanical properties and oxidation behavior of silicon nitride obtained by both conventional sintering and sintering followed by hot isostatic pressing （HIP）. Silicon nitride with additives such as 5 wt.% Al2O3 and 5 wt.% Ln203 （Ln= La, La concentrate, Gd or La＋Gd） were studied. The results revealed that Gd203 additions increased the formation of elongated grains of β-Si3N4, the fracture toughness and oxidation resistance. La2O3 additions led to higher densification and hardness values, while addition of La2O3 concentrate promoted the formation of materials with intermediate properties, compared to the other studied compositions. Hot isostatic pressing increased the hardness but decreased the fracture toughness of the material, mainly because it allowed residual pores to close and also reduced the average aspect ratio of β-Si3N4 grains.

关键词： rare earths silicon nitride properties normal sintering sinter-HIP

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^(11)C-PK11195 plasma metabolization has the same rate in multiple sclerosis patients and healthy controls:a cross-sectional study

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Neural Regeneration Research 2021年第12期16卷 2494-2498页

作者： Aline Morais de souza Milena Sales Pitombeira Larissa Estessi de souza Fabio Luiz Navarro Marques carlos Alberto Buchpiguel Caroline Cristiano Real Daniele de Paula Faria Laboratory of Nuclear Medicine(LIM43) Department of Radiology and OncologyFaculdade de Medicina FMUSPUniversidade de Sao PauloSao PauloSPBrazil department of Neurology Faculdade de Medicina FMUSPUniversidade de Sao PauloSao PauloSPBrazil

^(11)C-PK11195 is a positron emitter tracer used for Positron Emission Tomography(PET)imaging of innate immune cell activation in studies of neuroinflammatory *** the image quantitative analysis,it is necessary to quantify the intact fraction of this tracer in the arterial plasma during imaging acquisition(plasma intact fraction).Due to the complexity and costs involved in this analysis it is important to evaluate the real necessity of individual analysis in each 11C-PK11195 PET imaging *** purpose of this study is to compare 11CPK11195 plasma metabolization rate between healthy controls and multiple sclerosis(MS)patients and evaluate the interference of sex,age,treatment,and disease phenotype in the tracer intact fraction measured in arterial plasma samples.11C-PK11195 metabolization rate in arterial plasma was quantified by high performance liquid chromatography in samples from MS patients(n=50)and healthy controls(n=23)at 20,45,and 60 minutes after 11C-PK11195 *** were also stratified by sex,age,treatment type,and MS *** results showed no significant differences in the metabolization rate of healthy controls and MS patients,or in the stratified *** conclusion,11C-PK11195 metabolization has the same rate in patients with MS and healthy controls,which is not affected by sex,age,treatment,and disease ***,these findings could contribute to exempting the necessity for tracer metabolization determination in all 11C-PK11195 PET imaging acquisition,by using a population metabolization rate *** study procedures were approved by the Ethics Committee for Research Projects Analysis of the Hospital das Clinicas of the University of Sao Paulo Medical School(approval No.624.065)on April 23,2014.

关键词： ^(11)C-PK11195 HPLC kinetic modeling metabolization multiple sclerosis neuroinflammation PET imaging PET tracer radiometabolites

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Kinetic Rates of the Fischer Tropsch Synthesis on a Co/Nb_2O_5 Catalyst

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Journal of Natural Gas Chemistry 2006年第4期15卷 307-312页

作者： víctor R.Ahón Paulo L.C.Lage carlos D.D.de souza Fabiana M.Mendes Martin Schmal Federal University of Rio de Janeiro Programa de Engenharia Química COPPE/UFRJ C.P.6850221941-972Rio de JaneiroRJBrazil

The kinetics of the Fischer-Tropsch reaction over a Co/Nb2O5 catalyst in a fixed bed reactor was investigated experimentally. Experiments were carried out under isothermal and isobaric conditions （T=543 K, P=2.1 MPa） and under different conditions of several H2/CO feed molar ratio （0.49-4.79）, space velocities （0.2-3.8 h^-1）, mass of catalyst （0.3-1.5 g）, and CO conversion （10%-29%）. Synthesis gas conversion was measured and data were reduced to estimate the kinetic parameters for different Langmuir-Hinshelwood rate expressions. Differential and integral reactor models were used for the nonlinear regression of kinetics parameters. One of the rate equations could well explain the data. The hydrocarbon product distributions that were experimentally determined exhibited an unusual behavior, and a possible explanation was discussed.

关键词： Fischer-Tropsch natural gas kinetics selectivity

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Impact of multidrug resistance on the management of bacterial infections in cirrhosis

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World Journal of Clinical Cases 2023年第3期11卷 534-544页

作者： carlos Terra Ângelo Zambam de Mattos Marcelo souza Chagas Andre Torres denusa Wiltgen Barbara Muniz souza Renata Mello Perez Gastroenterology-Liver Unit State University of Rio de JaneiroRio de Janeiro 20551-030Rio de JaneiroBrazil Liver Unit Casa de Saúde São José-Rede Santa CatarinaRio de Janeiro 22271-080Rio de JaneiroBrazil Alliance of Brazilian Centers for Cirrhosis Car The ABC GroupRio de Janeiro 20551-030Rio de JaneiroBrazil Liver Unit Federal Hospital of LagoaRio de Janeiro 22470-050Rio de JaneiroBrazil Graduate Program in Medicine:Hepatology Federal University of Health Sciences of Porto AlegrePorto Alegre 90020-090Rio Grande do SulBrazil Gastroenterology and Hepatology Unit Irmandade Santa Casa de Misericórdia de Porto AlegrePorto Alegre 90020-090Rio Grande do SulBrazil Internal Medicine Federal Hospital of LagoaRio de Janeiro 22470-050Rio de JaneiroBrazil department of Internal Medicine Federal University of Health Sciences of Porto AlegrePorto Alegre 90020-090Brazil Hepatology Division Federal University of Rio de JaneiroRio de Janeiro 21941-617Rio de JaneiroBrazil IDOR D’Or Institute for Research and EducationRio de Janeiro 22281-100Rio de JaneiroBrazil

Patients with cirrhosis have an increased risk of infection and differently from other complications,that over the years are improving in their outcomes,infections in cirrhotic patients are still a major cause of hospitalization and death(up to 50%in-hospital mortality).Infections by multidrug-resistant organisms(MDRO)have become a major challenge in the management of cirrhotic patients with significant prognostic and cost-related *** one third of cirrhotic patients with bacterial infections is infected with MDR bacteria and their prevalence has increased in recent *** infections have a worse prognosis compared to infections by non-resistant bacteria because they are associated with lower rate of infection *** adequate management of cirrhotic patients with infections caused by MDR bacteria depends on the knowledge of some epidemiological aspects,such as the type of infection(spontaneous bacterial peritonitis,pneumonia,urinary tract infection and spontaneous bacteremia),bacteriological profile of antibiotic resistance at each health care unit and site of infection acquisition(community acquired,healthcare associated or nosocomial).Furthermore,regional variations in the prevalence of MDR infections determine that the choice of empirical antibiotic therapy must be adapted to the local microbiological *** treatment is the most effective measure to treat infections caused by ***,optimizing antibiotic prescribing is critical to effectively treat these *** of risk factors for multidrug resistance is essential to define the best antibiotic treatment strategy in each case and the choice of an effective empirical antibiotic therapy and its early administration is cardinal to reduce *** the other hand,the supply of new agents to treat these infections is very ***,specific protocols that include preventive measures must be implemented in order to limit the negative impact of this sev

关键词： Cirrhosis Infection Multidrug-resistance Bacterial Antibiotics Microbiota

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Partition coefficient prediction of Baker's yeast invertase in aqueous two phase systems using hybrid group method data handling neural network

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Chinese Journal of Chemical Engineering 2017年第5期25卷 652-657页

作者： carlos Eduardo de Araújo Padilha Sérgio Dantas de Oliveira Júnior Domingos Fabiano de Santana souza Jackson Araújo de Oliveira Gorete Ribeiro de Macedo Everaldo Silvino dos Santos Laboratory of Biochemical Engineering Chemical Engineering DepartmentFederal University of Rio Grande do Norte (UFRN)

A hybrid GMDH neural network model has been developed in order to predict the partition coefficients of invertase from Baker's yeast. ATPS experiments were carried out changing the molar average mass of PEG(1500–6000 Da), p H(4.0–7.0), percentage of PEG(10.0–20.0 w/w), percentage of MgSO_4(8.0–16.0 w/w), percentage of the cell homogenate(10.0–20.0 w/w) and the percentage of MnSO_4(0–5.0 w/w) added as cosolute. The network evaluation was carried out comparing the partition coefficients obtained from the hybrid GMDH neural network with the experimental data using different statistical metrics. The hybrid GMDH neural network model showed better fitting(AARD = 32.752%) as well as good generalization capacity of the partition coefficients of the ATPS than the original GMDH network approach and a BPANN model. Therefore hybrid GMDH neural network model appears as a powerful tool for predicting partition coefficients during downstream processing of biomolecules.

关键词： Partitioning Invertase Aqueous Two Phase System GMDH Neural network

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Recovery of polyphenols from camu-camu(Myrciaria dubia ***)depulping residue by cloud point extraction

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Chinese Journal of Chemical Engineering 2018年第12期26卷 2471-2476页

作者： carlos Eduardo de Araujo Padilha Juliana Chris Silva de Azevedo Francisco Caninde de Sousa Junior Sergio Dantas de Oliveira Junior Domingos Fabiano de Santana souza Jackson Araujo de Oliveira Gorete Ribeiro de Macedo Everaldo Silvino dos Santos Laboratory of Biochemical Engineering Chemical Engineering department Federal University of Rio Grande do Notre(UFRN)NatalRNBrazil Laboratory of Food Bioactive Compounds and Dairy Technology Chemical Engineering DepartmentFederal University of Rio Grande do Notre(UFRN)NatalRNBrazil

In this study the potential of cloud point extraction formed by a non-ionic surfactant was used in order to separate polyphenols from industrial residues of camu-camu. The effects of operational conditions of the cloud point extraction(CPE) on the polyphenol recovery and volumetric ratio were investigated. The results showed a maximum recovery of 95.71% that was obtained using 7.0 wt% Triton X-114, native pH(3.25), and 80 wt%polyphenol extract at 30 °C. The use of cloud point extraction was successful to recover the polyphenols from agroindustrial residue since it is a simple as well as of low-cost technique.

关键词： Cloud point extraction Recovery Polyphenols Camu-camu depulping residue

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