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Antarctic red algae in dye-sensitized photoelectrochemical cells for water splitting

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Advances in Polar Science 2024年第2期35卷 219-227页

作者： Florentina ARISPE María fernanda CERDÁ Laboratorio de Biomateriales IQBFacultad de CienciasUdelaRMontevideo 11400Uruguay

Phycoerythrin extracted from Antarctic red seaweeds shows promising characteristics to be applied as an anode sensitizer in water-splitting photoelectrochemical *** light irradiation and using an LED lamp,the red-colored protein shows an interesting ability to profit the incident light,as confirmed by the presence of oxygen bubbles next to the electrode surface without applying any external *** results showed that the addition of iodide is helpful to allow the regeneration of the dye;nevertheless,oxygen evolution is not *** analysis of the involved semi-reactions is also helpful to understand the observed *** exploration of Antarctic resources offers then an alternative for the development of green energies,with a particular focus on their use as sensitizers to profit from the sunlight in water-splitting as well as in photovoltaic devices.

关键词： sensitizers water-splitting red algae electrochemical

Regional validity of the parameters of a distributed runoff-erosion model in the semi-arid region of Brazil

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Science China(Technological Sciences) 2009年第11期52卷 3348-3356页

作者： SRINIVASAN Vajapeyam Srirangachar PAIVA fernanda Maria de Lima Federal University of Campina Grande Post-graduate programme in Civil and Environmental Engineering Campus I 58429-900 Campina Grande PB Brazil

The present paper examines the validity of the application of a distributed rainfall-runoff-erosion model on a regional basis in a semi-arid region of Brazil. The model tested is known as WESP (Water Erosion Simulation Program) developed by Lopes (1987). The model simulates the hydrograph and the sediment graph for individual events and thus, the model when properly calibrated can serve as a predictive tool for runoff and soil erosion on an individual or a continuous basis. The possibility of the existence of regionally applicable values for the parameters of the model WESP would be very interesting from the point of view of predictability of runoff and soil erosion from ungauged basins in the region. For this purpose, data collected in several experimental units in the experimental basin of Sumé as well as in the experimental basin of So Joo de Cariri have been used. The model was calibrated and validated in each of the experimental units (consisting of erosion plots and micro-basins) and the average value from all of the units for each of the parameters was considered to be the regional value. With these average values, all the events in all the experimental units were simulated. The results show that the runoff and erosion values simulated with this single parameter set were very good in all the units, being well within the acceptable deviations.

关键词： regional parameters model WESP experimental basins semi-arid region soil erosion

Nanosized magnetite in low cost materials for remediation of water polluted with toxic metals, azo- and antraquinonic dyes

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Frontiers of Environmental Science & Engineering 2015年第5期9卷 746-769页

作者： Maria fernanda HORST Veronica LASSALLE Maria Lujan FERREIRA Institute of Chemistry of the South (Inquisur Universidad Nacional del Sur~ONICET) Avda Alem 1253 Bahia Blanca Argentina Pilot Plant of Chemical Engineering (PLAPIQUI-UNS-CONICET) Universidad Nacional del Sur--CONICET Camino La Carrindanga km7 Bahia Blanca Argentina

Nanosized magnetite has emerged as an adsorbent of pollutants in water remediation. Nanoadsor- bents include magnetic iron oxide and its modifiers/ stabilizers, such as carbon, silica, clay, organic moieties （polymers, aminoaeids, and fatty acids） and other inorganic oxides. This review is focused on the recent developments on the synthesis and use of magnetic nanoparticles and nanocomposites in the treatment of contaminated water. The emphasis is on the influence of the iron oxide modifiers on some properties of interest such as size, BET area, and magnetization. The characteristics of these nanomaterials are related to their ability to eliminate heavy metal ions and dyes from wastewater. Comparative analysis of the actual literature was performed aiming to present the magnetic material, its preparation methodology and performance in the elimination of the selected pollutants. Vast information has been properly summarized according to the materials, their properties and preferential affinity for selected contaminants. The mechanisms governing nanomaterial＇s formation as well as the interactions with heavy metals and dyes have been carefully analyzed and associated to their efficiency.

关键词： nanomagnetite water remediation toxicmetals dyes supported magnetite

Mind the gap among patches in arid plant communities:rapid root proliferation in response to N addition

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Journal of Plant Ecology 2019年第1期12卷 89-95页

作者： Maria fernanda Reyes Martín RAguiar Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura(IFEVA)and Consejo Nacional de Investigaciones Científicas y Técnicas(CONICET) Universidad de Buenos AiresAv.San Martín 4453Buenos Aires C1417DSEArgentina

Aims In arid communities,it has been proposed that individual plants can extend their roots beyond their canopy exploring neighbour-ing bare ground *** becomes relevant in systems where the vegetation is distributed in patches surrounded by bare ***,whether roots of different species may be overlapping under bare ground areas is still *** factors control-ling root responses when no plants appear to be directly influ-encing the gap among patches are still *** aim of our study was to detect perennial grasses responses to an N enrich-ment *** In a semi-arid steppe(Patagonia,Argentina),we buried root traps filled with sieved soil with and without N addition,under bare soil *** were harvested after 4 and 6 *** neighbour-hoods(30 cm in diameter)included at least three of the dominant tussock *** harvests,we identified species in the traps by root traits and quantified diversity,biomass and specific relative growth *** Findings Bare ground areas show simultaneous root growth of different *** of perennial grass roots was higher with N addition than without it in the first harvest(4 months),but this difference disappeared in the second harvest(6 months).Root biomass was maximal after 6 months in N addition *** preferred by herbivores(Bromus pictus and Poa ligularis)showed rapid growth and responses to N *** between harvests may be an indicative that N pulses interact with rising temperatures and soil water content as growing season progress.

关键词： belowground community ecology grass species roots Patagonian steppe patchiness root growth rates zone of influence

Microencapsulation of Kluyveromyces marxianus and Plantago ovata in cheese whey particles: Protection of sensitive cells to simulated gastrointestinal conditions

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Food Bioscience 2023年第2期52卷 1183-1192页

作者： Monica Cerutti Martellet fernanda Majolo Larissa Cima Marcia Ines Goettert Claucia fernanda Volken de Souza Graduate Program in Biotechnology University of Vale do Taquari-UnivatesLajeadoRio Grande do SulBrazil Graduate Program in Medical Sciences University of Vale do Taquari-UnivatesLajeadoRio Grande do SulBrazil Institute of Pharmacy Pharmaceutical/Medicinal Chemistry and Tübingen Center for Academic Drug DiscoveryEberhard Karls University TübingenTübingenGermany

Cheese whey proteins are natural vehicles for biological agents that are used as an inexpensive and effective coating material in the encapsulation of *** this work,the yeast Kluyveromyces marxianus,of probiotic potential,was associated with the prebiotic Plantago ovata(Psyllium)in particles coated with cheese *** efficiency of encapsulation,gastrointestinal tract(GIT)viability,particle morphology,and adhesion to enteral cells were *** was encapsulated in different formulations with alginate(alg),psyllium(psy),and cheese whey(cw)through an extrusion process associated with vibrational *** encapsulated in different wall materials[alginate-psyllium-cheese whey(alg-psy-cw),alginate(alg),alginate-psyllium(alg-psy),and alginate-cheese whey(alg-cw)]were adequately protected,resulting in high cell viability(11.32,9.77,9.13,10.95 log CFU.g􀀀1,respectively).Regarding the bioavailability assay after three months of storage under refrigeration(±4℃),cells encapsulated in wall material alg-psy-cw demonstrated the best viability(>6 log CFU.g^(-1)).Encapsulated yeasts showed greater resistance to acidic conditions when exposed to simulations of the gastrointestinal tract,demonstrating a lower diffusion rate in the formulation made with wall material alg-psy-cw(10.03 log CFU.g^(-1)).The adhesion rate to Caco-2 cells was high(±3,166 yeasts/100 Caco-2 cells).Finally,the developed product in this study was found to be suitable for incorporation in functional foods,as well as in pharmaceutical products,demonstrating its biotechnological potential.

关键词： Coencapsulation Cheese whey Prebiotic Probiotic Biotechnology Yeast

Hyaluronic acid association with bacterial,fungal and viral infections:Can hyaluronic acid be used as an antimicrobial polymer for biomedical and pharmaceutical applications?

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Bioactive Materials 2023年第1期19卷 458-473页

作者： fernanda Zamboni Chun Kwok Wong Maurice N.Collins Bernal Institute School of EngineeringUniversity of LimerickIreland Health Research Institute University of LimerickIreland Department of Chemical Pathology The Chinese University of Hong KongHong Kong Special Administrative Region

The relationships between hyaluronic acid(HA)and pathological microorganisms incite new understandings on microbial infection,tissue penetration,disease progression and lastly,potential *** understandings are important for the advancement of next generation antimicrobial therapeutical strategies for the control of healthcare-associated ***,this review will focus on the interplay between HA,bacteria,fungi,and *** review will also comprehensively detail and discuss the antimicrobial activity displayed by various HA molecular weights for a variety of biomedical and pharmaceutical applications,including microbiology,pharmaceutics,and tissue engineering.

关键词： Hyaluronic acid Hyaluronidase Virulence Antibacterial Antifungal Antiviral

DroidEnemy: Battling adversarial example attacks for Android malware detection

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Digital Communications and Networks 2022年第6期8卷 1040-1047页

作者： Neha Bala Aemun Ahmar Wenjia Li fernanda Tovar Arpit Battu Prachi Bambarkar Department of Computer Science New York Institute of TechnologyNew YorkNY10023USA

In recent years,we have witnessed a surge in mobile devices such as smartphones,tablets,smart watches,etc.,most of which are based on the Android operating ***,because these Android-based mobile devices are becoming increasingly popular,they are now the primary target of mobile malware,which could lead to both privacy leakage and property *** address the rapidly deteriorating security issues caused by mobile malware,various research efforts have been made to develop novel and effective detection mechanisms to identify and combat ***,in order to avoid being caught by these malware detection mechanisms,malware authors are inclined to initiate adversarial example attacks by tampering with mobile *** this paper,several types of adversarial example attacks are investigated and a feasible approach is proposed to fight against ***,we look at adversarial example attacks on the Android system and prior solutions that have been proposed to address these ***,we specifically focus on the data poisoning attack and evasion attack models,which may mutate various application features,such as API calls,permissions and the class label,to produce adversarial ***,we propose and design a malware detection approach that is resistant to adversarial *** observe and investigate how the malware detection system is influenced by the adversarial example attacks,we conduct experiments on some real Android application datasets which are composed of both malware and benign *** results clearly indicate that the performance of Android malware detection is severely degraded when facing adversarial example attacks.

关键词： Security Malware detection Adversarial example attack Data poisoning attack Evasi on attack Machine learning Android

Magnitude of the contralateral efferent olivocochlear effect as a function of the frequency

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Journal of Otology 2022年第2期17卷 67-71页

作者： fernanda Anza Miranda Enzo Aguilar-Vidal Laboratorio de Audiología y Percepcion Auditiva Facultad de MedicinaUniversidad de ChileChile Escuela de Tecnología Medica Facultad de MedicinaUniversidad de ChileChile Departamento de Tecnología Medica Facultad de MedicinaUniversidad de ChileChile

Background:The activation of the medial olivocochlear reflex reduces the cochlear gain,which is manifested perceptually as decreased auditory ***,it has remained unclear whether the extent of this suppression varies according to the cochlear region *** we aims to assess the magnitude of contralateral efferent suppression across human cochlea,at low levels,and its impact on hearing ***:Assuming that acoustic stimulation activates the contralateral medial olivocochlear reflex,we evaluated the magnitude of the suppressive effect as a function of frequency in 17 subjects with normal *** thresholds were measured for bursts tones of various durations(10,100,and 500 ms)and frequencies(250,500,1000,4000,and 8000 Hz)in the presence or absence of contralateral white noise at 60 d B ***:We found that contralateral noise raised the absolute threshold for the burst tones *** effect was greater at lower than higher frequencies(3.85 d B at 250 Hz vs.2.22 d B at 8000 Hz).Conclusions:Our findings suggest that in humans,the magnitude of this suppression varies according to the cochlear region stimulated,with a greater effect towards the apex(lower frequencies)than the base(higher frequencies)of the cochlea.

关键词： Auditory perception Efferent system Medial olivocochlear reflex Absolute threshold

Thulium fiber laser lithotripsy:Is it living up to the hype?

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Asian Journal of Urology 2023年第3期10卷 289-297页

作者： John Denstedt fernanda C.Gabrigna Berto Division of Urology Department of SurgeryWestern UniversitySchulich School of Medicine and DentistryLondon Canada

Objective:The holmium:yttrium-aluminium-garnet laser(Ho:YAG)has been the gold standard for laser lithotripsy over the last three *** demonstrating good in vitro efficacy,the thulium fiber laser(TFL)has been recently released in the market and the initial clinical results are *** article aims to review the main technology differences between the Ho:YAG laser and the TFL,discuss the initial clinical results with the TFL as well as the optimal settings for TFL ***:We reviewed the literature focusing on the technological aspects of the Ho:YAG laser and TFL as well as the results of in vitro and in vivo studies comparing both ***:In vitro studies show a technical superiority of TFL compared to the Ho:YAG laser and encouraging results have been demonstrated in clinical ***,as TFL is a new technology,limited studies are currently available,and the optimal settings for lithotripsy are not yet ***:TFL has the potential to be an alternative to the Ho:YAG laser,but more reports are still needed to determine the optimal laser for lithotripsy of urinary tract stones when considering all parameters including effectiveness,safety,and costs.

关键词： Urolithiasis Thulium fiber laser Holmium:yttriumaluminium-garnet laser Laser lithotripsy