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Preparation of a Slow Release Biofertilizer From a Polymeric Urea-Formaldehyde Matrix (PUFM)

Phyton-International Journal of Experimental Botany 2019年第4期88卷 459-470页

作者： Laura Siverio Martínez mayra gonzález hurtado Laura M.Castro gonzález Jacques Rieumont Briones Ariel Martínez García María I.Hernández Díaz Institute of Materials Science and Technology Polymer LaboratoryUniversity of HavanaZapata and GC.P.10400C.Havana CityCuba National Autonomous University of Mexico Department of Physical and Theoretical Chemistry CoyoacanDistrito FederalMX Faculty of Chemistry University of HavanaDepartment of Physical ChemistryZapata and GC.P.10400Havana CityCuba Institute of Horticultural Research Liliana Dimitrova Quivicánkm 33½.Havana CityCuba

Fertilizers industry faces the challenge of improving the efficiency of its products either by optimizing the fertilizers in use or by developing new types of *** the last decade,controlled and slow release technologies have become more *** technologies aim to increase the efficiency of the applied substance by increasing its action over time and avoiding losses of all kinds(leaching,volatilization).The main purpose of the current study was to obtain a slow release biofertilizer by incorporating microalgae into a polymeric urea-formaldehyde matrix(PUFM).The quantitative analysis of macronutrients and micronutrients in the microalgae was determined using different techniques including titration,UV and Atomic Adsorption *** matrix and the formulation obtained(PUFM+CHLO)were also characterized by Infrared Spectroscopy(FTIR)and Scanning Electron Microscopy(SEM).The“in vitro”study showed a typical slow release behavior of nitrogen(N),phosphorus(P)and potassium(K)*** was also shown that(PUFM+CHLO)formulation has the slowest macronutrients release time with a maximum release of 28%,26%y 46%for(N-P-K)macronutrients respectively during a period of 30 ***"in vivo"study exposed the benefits of the biofertilizer formulation(PUFM+CHLO)from conventional commercial fertilizer(CF)(NPK-14-5-12).Due to the presence of nutrients of natural origin in microalgae,(PUFM+CHLO)shows ecological effects which could also developing sustainable agriculture systems.

关键词： Slow-release fertilizer microalgae polymeric matrix nutrients

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Kentish Plover(Charadrius alexandrinus) and Little Tern(Sternula albifrons) prefer shells for nesting:A field experiment

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Avian Research 2024年第1期15卷 55-59页

作者： Macarena Castro Andrés De la Cruz Nuria Martin-Sanjuan Alejandro Pérez-hurtado Instituto Universitario de Investigacion Marina(INMAR) Campus de Excelencia Internacional del Mar(CEIMAR)Departamento de BiologíaUniversidad de CadizPuerto RealSpain Servicios centrales de Investigacion Salinas de la Esperanza Universidad de CadizPuerto RealSpain

Shorebird populations are declining worldwide,mainly due to human disturbances and loss of coastal ***,supratidal habitats as saltpans could play a role in buffering human *** have shown to be important as feeding or breeding sites of some shorebird species.A potential conservation strategy to increase shorebird populations in saltpans is to manipulate the cues that birds use to select optimal breeding *** it is hypothesized that shorebirds are attracted to bivalve shells due to the advantages they *** this hypothesis,we supplemented a restored saltpan in 2019 and 2021 with bivalve shells,expecting an increase in the number of breeding birds’ *** than 75% of Kentish Plover(Charadrius alexandrinus) and Little Tern(Sternula albifrons) nests were found in patches with shells in both *** best model for both species indicates that the presence of shells is the factor that most correlates with the location of *** probability of choosing one place over another to settle their nest increases in areas with an abundance of shells,double in the case of the Kentish Plover and triple in the case of the Little *** result of this study may constitute a valuable tool for attracting birds to restored saltpans and could contribute to the success of expensive restoration projects where time is usually a constraint.

关键词： Habitat management Nest site selection Saltpan restoration Shell supplementation Shorebirds

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Experimental investigation of gaseous solvent huff-n-puff in the Middle Bakken Formation

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Petroleum Science 2023年第6期20卷 3488-3497页

作者： Samuel Asante Afari Kegang Ling Demetrius Maxey Billel Sennaoui Jerjes hurtado Porlles Department of Petroleum Engineering University of North Dakota2844 Campus RdStop 8154Grand ForksND58202-6116USA

The efficacy of gaseous solvents in enhancing oil recovery(EOR)in unconventional reservoirs and the influence of operational and design parameters are still debated among the oil recovery research *** work investigated the recovery-enhancing capabilities of two potent gaseous solvents,CO_(2) and ethane,in tight core *** huff-n-puff(H-n-P)experiments were conducted under three miscibility conditions to investigate the influence of the key operating parameters and the dependency of their impact on the miscibility conditions and gas *** results show that oil recovery increased with increasing pressure from below(BM)to above(AM)miscibility pressure in a non-linear trend,irrespective of the gas ***,the influence of the soak period was noticeably dependent on the miscibility condition,specifically more remarkable under AM conditions and less apparent under BM ***,the effect of the production period was more pronounced at AM conditions for both ***,the impact of rock surface area-to-volume(SA/V)was only observed at BM,where both gases recovered more oil in the core samples with high SA/*** general,ethane showed a higher efficacy for oil recovery than CO_(2);CO_(2) recovered 21%–70%of oil in small core samples,while ethane could recover 32%–88%.The highest recovery was achieved with ethane injected under AM conditions,with a prolonged soak time,a short production period and into a core sample with a high SA/*** believe the findings from this work will help better understand and design H-n-P EOR projects.

关键词： Unconventional reservoirs Huff-n-puff Gas solvent Ethane CO_(2)miscibility

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Foreign exchange trading and management with the stochastic dual dynamic programming method

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Financial Innovation 2023年第1期9卷 583-620页

作者： Lorenzo Reus Guillermo Alexander Sepulveda‑hurtado Escuela de Negocios Universidad Adolfo IbanezDiagonal Las Torres2640 SantiagoChile

We present a novel tool for generating speculative and hedging foreign exchange(FX)trading *** solution provides a schedule that determines trades in each rebalancing period based on future currency prices,net foreign account positions,and incoming(outgoing)flows from business *** obtain such policies,we construct a multistage stochastic programming(MSP)model and solve it using the stochastic dual dynamic programming(SDDP)numerical method,which specializes in solving high-dimensional MSP *** construct our methodology within an open-source SDDP package,avoiding implementing the method from *** measure the performance of our policies,we model FX prices as a mean-reverting stochastic process with random events that incorporate stochastic *** calibrate this price model on seven currency pairs,demonstrating that our trading policies not only outperform the benchmarks for each currency,but may also be close to ex-post optimal *** also show how the tool can be used to generate more or less conservative strategies by adjusting the risk tolerance,and how it can be used in a vari-ety of contexts and time scales,ranging from intraday speculative trading to monthly hedging for business ***,we examine the impact of increasing trade policy uncertainty(TPU)levels on our *** findings show that the volatility of currencies from emerging economies rises in comparison to currencies from devel-oped *** discover that an increase in the TPU level has no effect on the aver-age profit obtained by our ***,the risk exposure of the policies increases(decreases)for the group of currencies from emerging(developed)markets.

关键词： FX trading FX risk SDDP Multistage stochastic programming Julia Trade policy uncertainty

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Seed Dispersal of Citharexylum tetramerum and Ziziphus penduculata by Carnivorous in a Xerophilous Scrub at Tehuacan, Puebla, Mexico

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American Journal of Plant Sciences 2023年第9期14卷 977-987页

作者： gonzález-Pérez Adrián Miguel A. Armella Maria de Lourdes Yáñez-López María de Lourdes Martinez-Cárdenas José Alejandro Zavala-hurtado Department of Biology Universidad Autonoma Metropolitana Unidad Iztapalapa Iztapalapa Ciudad de Mexico Mexico Department of Biotechnology Universidad Autonoma Metropolitana Unidad Iztapalapa Iztapalapa Ciudad de Mexico Mexico Department of Health Sciences Universidad Autonoma Metropolitana Unidad Iztapalapa Iztapalapa Ciudad de Mexico Mexico

Seed dispersion reduces the depredation rate and increases genetic flow. Some species of Carnivora consume fruits as a standard component of their diet, so they become potential seed dispersers. In Mexico, a few studies evaluated carnivorous as seed dispersers, especially in dry ecosystems. Citharexylum tetramerum and Ziziphus pedunculata are endemic plants from the Tehuacán-Cuicatlán’s Biosphere Reserve (TCBR);however, there are very little data about dispersal seeds for both species. We assessed the germination of seeds ingested by carnivores obtained from feces. We compared them with seeds from fruits as a control group. At the Metropolitan University laboratory, we germinated seeds, from: plants, scats, and fruits, and we used Kruskall Wallis Test to compare percentage and germination rate. C. tetramerum seeds ingested by a carnivorous decreased in germination percentage and rate. In contrast, the percentage and rate of germination of Z. pedunculata seeds from carnivorous feces were higher than the control group. However, Z. pedunculata control seeds did not germinate during tests, but at the end of the tests, we found that 90% of control seeds were not dead, so they were dormant seeds. Carnivores interact as legitime dispersers for both plants because they are keeping the viability of seeds. Still, we only showed that Z. pedunculata gut carnivores broke with the dormancy of seeds. We consider that in future research, it could be essential to identify other animals that consume fruits of those plants and if it is possible to follow seeds after they have been removed. Those points could help to get better understanding of those endemic plants from Tehuacán.

关键词： Seed Dispersal

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China-Colombia:un nuevo punto de partida

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今日中国（西文版） 2022年第8期 34-35页

作者： FELIPE hurtado SIERRA 不详

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Chronotype and self-reported sleep,alertness,and mental health in U.S. sailors

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Military Medical Research 2022年第2期9卷 259-261页

作者： Elizabeth M.Harrison Alexandra P.Easterling Emily A.Schmied Suzanne L.hurtado Gena L.Glickman Center for Circadian Biology University of California San DiegoSan DiegoUSA Leidos Inc.San DiegoUSA Health and Behavioral Sciences Department Naval Health Research CenterSan DiegoUSA School of Public Health San Diego State UniversitySan DiegoUSA Departments of Psychiatry and Neuroscience Uniformed Services University of the Health SciencesBethesdaUSA

Service members are at risk for sleep and psychological conditions affecting their readiness. Chronotype(“morningness”or “eveningness”) is strongly associated with sleep, health and performance. The objective of this study was to examine associations between validated measures of chronotype and sleep quality, daytime functioning, alertness,and symptoms of depression, anxiety, and post-traumatic stress disorder(PTSD) in US service members(n=298).Although predominantly young males(who skew toward eveningness in civilian populations), these Sailors skewed toward morningness(35.6% morning, 51.3% intermediate). Eveningness was associated with symptoms of depression and PTSD(P<0.01), less time in bed(P<0.05), more sleep disruption(P<0.01), and poorer daytime functioning and alertness(P<0.05). Evening types were less likely to consider sleep important for performance(P<0.05). To maximize service member readiness, schedules should be aligned with endogenous rhythms, whenever possible, and evening chronotypes may benefit from targeted interventions. Chronotype should be examined alongside health and readiness in service members.

关键词： Circadian Chronotype Sleep Military Readiness Depression Anxiety Post-traumatic stress disorder

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Exploring the reproductive ecology of the tropical semifossorial snake Ninia atrata

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Zoological Research 2020年第2期41卷 157-171页

作者： Teddy Angarita-Sierra Cesar Alejandro Lopez-hurtado Tropical Organism Biology Research Group Universidad Nacional de ColombiaBogota111321Colombia Yoluka ONG Fundacion de Investigacion en Biodiversidad y ConservacionBogota110931Colombia Vicerrectoria de Investigacion Universidad Manuela BeltranBogota110231Colombia

Based on histological analyses and field studies,this research describes the reproductive ecology of a population of Ninia atrata snakes inhabiting an oil palm ***,through a multivariate approach,we explored the main drivers of reproductive output in *** showed that prey abundance and food intake were crucial variables contributing to reproductive *** linear regression models showed that neonates had high sensitivity(R2=55.29%)to extreme changes in climate,which was strongly related to slug and snail abundance variability and microhabitat *** cycles were markedly different between the sexes,being continuous in males and cyclical in *** this variation,reproductive cycles at the population level were seasonal *** recruitment of neonates all year,multiple clutches,high mating frequency,and continuous sperm production characterized the reproductive phenology of *** addition,a significant number of previtellogenic females presented oviductal sperm as well as uterine scars,suggesting a high precocity in the *** main drivers of reproductive output also differed between the *** females,clutch size and secondary follicle variability were highly related to stomach bolus volume,fat body area,and body *** males,height of piles of palm leaves and body mass,rather than intrinsic reproductive traits,were the main drivers of sperm ***,in both cases,the relationship between body mass,prey abundance,and food intake suggests that *** follows the income breeding strategy to compensate for reproductive costs and to maximize fitness.

关键词： Continuous male reproduction Clutch mass Income breeding Iteroparity Spermatogenesis Oogenesis Reproductive effort El Nino-Southern Oscillation(ENSO)

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Clinical perspectives,assessment,and mechanisms of metabolicassociated fatty liver disease in patients with COVID-19

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World Journal of Gastroenterology 2021年第33期27卷 5502-5519页

作者： Alejandro Campos-Murguía Berenice M Román-Calleja JoséA gonzález-Regueiro Ivonne hurtado-Díaz-de-León Alberto Adrián Solís-Ortega Nayelli C Flores-García Ignacio García-Juárez Astrid Ruiz-Margáin Ricardo Ulises Macías-Rodríguez Department of Gastroenterology Instituto Nacional de Ciencias Médicas y Nutrición Salvador ZubiránMexico City 14080Mexico Liver Fibrosis and Nutrition Lab(LFNLab) MICTLÁN-Network(Mechanisms of Liver InjuryCell Death and Translational Nutrition in Liver Diseases-Research Network)Mexico City 14080Mexico

Metabolic diseases are highly prevalent worldwide and have been associated with adverse clinical outcomes,including mortality,in patients developing coronavirus disease(COVID-19).Because of the close relationship between metabolic diseases such as type 2 diabetes mellitus and obesity and the presence of metabolicassociated fatty liver disease(MAFLD),a high number of cases of patients affected by both MAFLD and COVID-19 would be expected,especially in highrisk *** studies have shown an increased risk of adverse clinical outcomes,viral shedding,and deep vein thrombosis,especially in patients with MAFLD-related liver *** predisposition to poor outcomes and severe acute respiratory syndrome coronavirus 2 infection in patients with MAFLD could be secondary to mechanisms common to both,including preexisting systemic chronic inflammation,endothelial dysfunction,and involvement of the renin-angiotensin *** of the increased risk of adverse outcomes,MAFLD should be screened in all patients admitted for *** computed tomography scans could be of help,assessment of liver fibrosis is also recommended,favoring noninvasive methods to limit the exposure of healthcare *** involvement in this population ranges from abnormalities in liver chemistry to hepatic steatosis in postmortem ***,preventive measures should be strongly advocated in patients already known to have MAFLD,including the use of telemedicine and vaccination in addition to general measures.

关键词： Metabolic-associated fatty liver disease COVID-19 Mortality Fibrosis Histology Epidemiology

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Effect of grain recrystallization on stir zone and mechanical property behavior of TRIP 780 steel

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Journal of Iron and Steel Research(International) 2020年第2期27卷 188-196页

作者： Gladys Perez-Medina Hugo Lopez Argelia Miranda-Perez Eduardo hurtado-Delgado Postgraduate Studies Mexican Corporation in Materials ResearchSaltillo Coahuila 25290Mexico Materials Department University of Wisconsin-MilwaukeeMilwaukeeWI 53201USA

Electron backscatter diffraction(EBSD)and transmission electron microscopy were used to determine the presence of retained austenite and displacive-type phase transformation in the stir zone of friction stir welding(FSW).Severe plastic deformations occurred in the stir zone where there was an increase in the temperature attributed to the FSW process and subsequently a grain *** the recrystallization phenomena,the formation of grain evolution development in steels was resolved using *** addition,a tensile test was carried out in order to reveal the results of mechanical *** was found that the fracture zone occurred in the stir zone with an ultimate tensile strength of 587 MPa,a decrease of 267 MPa compared with that of the base *** this result,it is evident that the fracture exhibits numerous elongated dimples,distributed homogeneously,and certain locations contain cleavage fractures due to differences in the microstructure of the base *** profile tests of the welding regions were conducted,and the results showed that the stir zone was present with elevated hardness(near 350 HV).Characterization techniques revealed that the austenite-to-martensite transformation occurred in the stir zone,resulting in a loss of mechanical properties in the joint.

关键词： Friction welding Transformation-induced plasticity steel Stir zone Mechanical property Tensile test

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