Publications by authors named "Leiva L"

Background: The WHO states that antivenom is the only safe and effective treatment to neutralize snake venom. Snakebite antivenom typically involves horse hyperimmunization with crude venom and Freund's adjuvant.

Methods: In the current work, we analyzed the ascorbyl palmitate liquid crystal structure with snake protein or PLA2, the carrier charge capacity, and we evaluated the immune response induced by the enzyme P9a(Cdt-PLA2) formulated in a nanostructure using CpG-ODN, determining the titer of IgG antibodies.

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Introduction: Implementing sex education programs during adolescence is crucial for addressing the risks associated with sexuality. However, some of these interventions lack proper incorporation of a gender perspective and maintain a heteronormative and biologically-focused approach, potentially resulting in inequitable outcomes for adolescents. In response, comprehensive sex education is most effective due to its multidimensional view of sexuality.

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Coronaviruses are common around the world and infect a wide variety of animals, including domestic and wild ones. They are characterized by causing respiratory, enteric, hepatic, and neurological diseases of varying severity, from asymptomatic to severe. Wild animals play a crucial role in this group of viruses since they can act as hosts or reservoirs for pathogenic species of humans and domestic animals.

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Purpose - The Latin American Society of Immunodeficiencies (LASID) Registry was established in 2009 to collect data on Inborn Errors of Immunity (IEI) patients in the region. Although several reports have been published regarding LASID data, this is the first report of the entire dataset. Methods - The European Society of Immunodeficiencies (ESID) donated the online platform in 2008.

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Snake venoms are a complex mixture of proteins and polypeptides that represent a valuable source of potential molecular tools for understanding physiological processes for the development of new drugs. In this study two major PLAs, named PLA-I (Asp49) and PLA-II (Lys49), isolated from the venom of Bothrops diporus from Northeastern Argentina, have shown cytotoxic effects on LM3 murine mammary tumor cells, with PLA-II-like exhibiting a stronger effect compared to PLA-I. At sub-cytotoxic levels, both PLAs inhibited adhesion, migration, and invasion of these adenocarcinoma cells.

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It is well known that C. d. terrificus venom causes pathophysiological effects such as neuropathies, coagulopathies, and even death.

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: Sjögren's Syndrome (SS) is a chronic degenerative rheumatic disease. Because of its chronic nature, it significantly affects the quality of life of those who suffer from it. : This qualitative study investigated disease experience among women suffering from SS to understand its impact on their overall well-being.

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Identifying issues in early childhood enables timely interventions, potentially mitigating future mental health risks. In this context, this study seeks to validate the model of Preschool Pediatric Symptom Checklist for detecting social and emotional challenges among Chilean preschoolers, as reported by their caregivers. In the first stage, 36 cognitive interviews using the published Spanish version of the PPSC were conducted with caregivers, parents and/or teachers of preschool aged children, so that they could review the questions and be sure that they understood them.

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Background: There is general agreement that sexuality is a central aspect of human development; it is key in sexual health and reproductive education during adolescence. However, in spite of the existing interventions on this topic and the evidence generated, the inclusion of a gender focus in sexuality is relatively recent and there is little evidence available, thus structured and corroborated interventions with a gender-transforming perspective in sexuality are required.

Methods: We will use a mixed method experimental design with a parallel cluster-randomized trial (GRTs) that will evaluate the effectiveness of a comprehensive gender-transformative intervention of sexual education (ENFOCATE -Focus-on-), which will be complemented with qualitative studies to understand the implementation process.

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Conversational Agents (CAs) have made their way to providing interactive assistance to users. However, the current dialogue modelling techniques for CAs are predominantly based on hard-coded rules and rigid interaction flows, which negatively affects their flexibility and scalability. Large Language Models (LLMs) can be used as an alternative, but unfortunately they do not always provide good levels of privacy protection for end-users since most of them are running on cloud services.

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Bacterial antibiotic persistence is a phenomenon where bacteria are exposed to an antibiotic and the majority of the population dies while a small subset enters a low metabolic, persistent, state and are able to survive. Once the antibiotic is removed the persistent population can resuscitate and continue growing. Several different molecular mechanisms and pathways have been implicated in this phenomenon.

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Article Synopsis
  • - The study examined the impact of agro-industrial wastewater, particularly from dairy activities, on the water quality and aquatic life in Santa Fe province, Argentina, focusing on the Los Troncos Stream and the San Carlos Channel.
  • - Results indicated significant levels of pollution, with high concentrations of pesticides and contaminants leading to severe mortality in aquatic organisms, particularly turtles, and causing ecological stress in tadpoles exposed to the wastewater.
  • - The findings highlight a critical environmental crisis, showing that the water quality in the affected areas exceeds safe limits for aquatic life, emphasizing the urgent need for effective waste management solutions in agro-industrial practices.
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Pepsin is one of the major enzymes with significant importance in the food industry, biomedicines, and pharmaceutical formulations. In this work, the main objective was to biochemically characterize a pepsin-like enzymatic extract obtained from Pygocentrus nattereri, a predatory freshwater fish, focusing on their potential industrial application. The obtained extract exhibited optimal activity at 45 °C and pH 1.

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Article Synopsis
  • Pulmonary hypertension (PH) can lead to serious consequences like right heart failure, but effective treatments are hindered by a lack of understanding.
  • Research identified that MCJ (a protein) increases in response to low oxygen levels (hypoxia) and its absence protects right ventricular function from damage caused by chronic hypoxia.
  • The findings suggest that targeting MCJ could be a promising strategy for treating PH by maintaining heart function and preventing lung remodeling.
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Brain-Computer Interfacing (BCI) has shown promise in Machine Learning (ML) for emotion recognition. Unfortunately, how data are partitioned in training/test splits is often overlooked, which makes it difficult to attribute research findings to actual modeling improvements or to partitioning issues. We introduce the "data transfer rate" construct (i.

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Objective: Describe clinicians' perspectives of facilitators and barriers to eliciting physical function goals from patients with multiple chronic conditions pre- and post-surgery.

Methods: Semi-structured qualitative interviews were conducted with clinicians, recruited from an academic medical center, who treat adult patients with multiple chronic conditions. Purposive sampling ensured multiple provider types were represented.

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This study proposes an alternative method using NaEDTA to neutralize B. alternatus venom and using it as an immunogen from the start of inoculation to minimize side effects and enhance antivenom production. To achieve this, 1.

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Our study was undertaken to determine the best samples and selective-differential plating media to be used for Salmonella spp. isolation. We also compared hematological and serum biochemical values, Salmonella biovar Gallinarum (SG) detection (isolation and serological test), and inflammatory intestinal response (fecal leukocyte) in laying hens with naturally occurring fowl typhoid outbreaks.

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Purpose: The study goal was to validate the Observer-Reported Communication Ability (ORCA) measure for use with females with Rett Syndrome (RTT).

Methods: Qualitative interviews, including concept elicitation and cognitive interviewing methods, were conducted with 19 caregivers of individuals with RTT ages 2 and older. A quantitative study was then conducted in 279 caregivers to evaluate construct validity and reliability.

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Spin-orbit torque (SOT) is receiving tremendous attention from both fundamental and application-oriented aspects. CoMnGa, a Weyl ferromagnet that is in a class of topological quantum materials, possesses cubic-based high structural symmetry, the L2 crystal ordering, which should be incapable of hosting anisotropic SOT in conventional understanding. Here we show the discovery of a gigantic anisotropy of self-induced SOT in CoMnGa.

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Mounting evidence suggests that animals and their associated bacteria interact via intricate molecular mechanisms, and it is hypothesized that disturbances to the microbiome influence animal development. Here, we show that the loss of a key photosymbiont (i.e.

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A crucial aspect of human development is sexuality which has implications for health, particularly in adolescence, since unfavorable sexual experiences may result in physical and mental problems. Sexuality education interventions (SEI) are one of the most used actions to promote sexual health in adolescents. Nevertheless, there is variability across their components; therefore, key elements for an effective SEI targeted at adolescents (A-SEI) are not well known.

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Nucleotides are at the heart of the most essential biological processes in the cell, be it as key protagonists in the dogma of molecular biology or by regulating multiple metabolic pathways. The dynamic nature of nucleotides, the cross talk between them, and their constant feedback to and from the cell's metabolic state position them as a hallmark of adaption toward environmental and growth challenges. It has become increasingly clear how the activity of RNA polymerase, the synthesis and maintenance of tRNAs, mRNA translation at all stages, and the biogenesis and assembly of ribosomes are fine-tuned by the pools of intracellular nucleotides.

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Introduction: The response of enterobacteria to oxidative stress is usually considered to be regulated by transcription factors such as OxyR and SoxR. Nevertheless, several reports have shown that under oxidative stress the levels, modification and aminoacylation of tRNAs may be altered suggesting a role of codon bias in regulation of gene expression under this condition.

Methods: In order to characterize the effects of oxidative stress on translation elongation we constructed a library of 61 plasmids, each coding for the green fluorescent protein (GFP) translationally fused to a different set of four identical codons.

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