Publications by authors named "Carlos Portillo"

Hydrogen has emerged as a promising energy carrier, offering a viable solution to meet our current global energy demands. Solar energy is recognised as a primary source of renewable power, capable of producing hydrogen using solar cells. The pursuit of efficient, durable, and cost-effective photocatalysts is essential for the advancement of solar-driven hydrogen generation.

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Solar saline water splitting is a promising approach to sustainable hydrogen production, harnessing abundant solar energy and the availability of brine resources, especially in the Atacama Desert. Bischofite salt (MgCl·6HO) has garnered significant attention due to its wide range of industrial applications. Efficient hydrogen production in arid or hyper arid locations using bischofite solutions is a novel and revolutionary idea.

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Article Synopsis
  • Ag-based electrical contact materials are crucial in low-voltage devices like relays and switches, with Ag-CdO composites historically favored for their excellent properties, though toxicity issues with Cd have led to restrictions.
  • A new, eco-friendly alternative using Ag-ZnSnO-based materials is being explored, focusing on the hot mechanochemical oxidation of a Ag-Sn-Zn solid solution made through mechanical alloying.
  • The study indicates that this method yields uniform nanoscale ZnSnO precipitates and reveals that the oxidation process follows the Johnson-Mehl-Avrami-Kolmogorov model, with the oxidation mechanism primarily driven by three-dimensional oxide growth limited by oxygen diffusion after nucleation.
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Objective: Describe the methodological aspects, sociodemographic, and clinical characteristics of patients hospitalized with acute decompensated heart failure (ADHF) and their short-term outcomes.

Methods: Prospective cohort of patients with ADHF from the emergency service of the cardiovascular center. Descriptive statistics were used to synthesize sociodemographic characteristics, clinical characteristics during hospitalization, and outcomes.

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  • Corrosion is a common and costly problem for metallic structures, especially in saline environments like seawater, raising safety issues.
  • Green corrosion inhibitors, which are eco-friendly and biodegradable, show promise as alternatives to traditional inhibitors but face challenges in salty conditions.
  • This review covers key aspects of corrosion inhibitors, the mechanisms behind corrosion and inhibition in NaCl, characterization techniques, theoretical models, and guidelines for selecting corrosion inhibitors to enhance research in this field.
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Excess energy derived from photosynthesis can be used in plant microbial fuel cell (PMFC) systems as a sustainable alternative for the generation of electricity. In this study, the in situ performance of CAM (Crassulacean acid metabolism) plants in Calama, in the Atacama Desert, was evaluated for energy recovery using PMFCs with stainless steel AISI 316L and Cu as electrodes. The plant species evaluated included , , , , , and .

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Background: Allostatic load (AL) is associated with a heightened predisposition to disease due to prolonged activation of biological stress-response systems. Alcohol use disorder (AUD) is known to activate these systems. The primary aim of the current study was to examine the relationship between AL and AUD.

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Objective: Alcohol-related injury is a sentinel event, an unanticipated medical event that may prompt a re-evaluation of health behaviors, such as alcohol use. Few studies have examined the psychological components of the sentinel event that motivate behavior change. In the present study, we examined the influence of cognitive and affective components of an alcohol-related injury on changes in alcohol use following a brief intervention.

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Alcohol use is prevalent among undergraduates, however, limited research on drinking among Latinx college students exists. This study examined potential risk and protective factors of alcohol use and consequences. Participants ( 382) completed multiple measures including alcohol use frequency and the Rutgers Alcohol Problem Index (RAPI).

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Background: In certain unisexual flowers, non-functional sexual organs remain vestigial and unisexuality can be overlooked leading to the ambiguous description of the sexual systems. Therefore, to accurately describe the sexual system, detailed morphological and developmental analyses along with experimental crosses must be performed. Cylindropuntia wolfii is a rare cactus endemic to the Sonoran Desert in southern California and northern Baja California that was described as gynodioecious by morphological analysis.

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While marijuana use rates are significantly high within college students, less is known about use patterns and correlates in Latinx groups. This study assessed the relationships between ever use and frequency of use of marijuana, polysubstance use, expectancies, motives, and mental illness symptoms among Latinx college students ( = 345). Results indicated more frequent marijuana use was positively associated with: enjoyment, celebration, social anxiety, low risk, sleep and availability and was negatively associated with: experimentation, boredom, altered perception, and anxiety.

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Objective: This article characterises the burden of childhood injuries and provides examples of evidence-based injury prevention strategies developed using a citywide injury surveillance system in Pasto, Colombia.

Methods: Fatal (2003-2007) and non-fatal (2006-2007) childhood injury data were analysed by age, sex, cause, intent, place of occurrence, and disposition.

Results: Boys accounted for 71.

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New derivatives of 4-N-benzylamino-4-hetarylbut-1-ene containing a pyridyl nucleus were synthesized from benzylamines and pyridine aldehydes. N-oxide derivatives were obtained from these homoallylamines. Study of the antiparasitic properties of obtained pyridine derivatives as well as of four related benzazepines previously described, was carried out using cytotoxicity assays against Trichomonas vaginalis and epimastigote form of Trypanosoma cruzi protozoa.

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New nitro- and aminoquinoline derivatives containing a pyridyl nucleus were synthesized from 6, 8-disubstituted 4-methyl-2-pyridylquinolines, which were prepared from N-pyridylmethylidenanilines. The anti-chagasic and trichomonacidal in vitro activity, as well as the cytotoxic properties towards macrophages of some of these compounds were evaluated. Although some of the compounds showed only moderate activity it was possible to establish some structure-activity relationships.

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