Tobacco Use Patterns From Adolescence to Young Adulthood Among Latinx Youth From Rural Communities.

PURPOSE: To examine patterns in adolescent and young adult tobacco use, comparing Latinx foreign-born children and children of foreign-born parents (i.e., children of immigrants(COI)) to Latinx US-born children of US-born parents (i.e., children of nonimmigrants,(CONI)) and to CONI White youth who grew up in small and rural towns. METHODS: Data were from youth who lived in control communities that participated in a community-randomized trial of the Communities That Care prevention system. We compared Latinx CONI (n = 154) with Latinx COI (n = 316) and with non-Latinx White CONI (n = 918). We examined tobacco use in adolescence (any adolescent use, early onset, and chronic use) and young adulthood (any past-year tobacco use, any daily smoking, any nicotine dependence symptoms) with mixed-effects logistic regressions. RESULTS: In adolescence, Latinx CONI had a higher prevalence of any and chronic tobacco use relative to Latinx COI, and of any and early onset tobacco use relative to non-Latinx White CONI. In young adulthood, Latinx CONI were more likely to report tobacco use in the past year, any symptoms of nicotine dependence, and daily smoking relative to Latinx COI; and more likely to report daily smoking relative to non-Latinx White CONI. Generation differences in young adult tobacco use were explained by chronic tobacco use in adolescence. DISCUSSION: The study suggests targeting chronic tobacco use in adolescence to prevent disparities in tobacco outcomes among Latinx young adults from rural communities.

Occurrence of Chemical Contaminants in Peruvian Produce: A Food-Safety Perspective.

The presence of chemical contaminants in agricultural products is a continued food-safety challenge in Peru. This country has robust agriculture potential, but its output of fruits and vegetables is severely impacted by massive mining activities, as well as poor farming practices, including the use of polluted irrigation water, misuse of pesticides, and inadequate postharvest conditions. This review examines the current scientific knowledge on the levels of pesticide residues, heavy metals, and mycotoxins on crops produced in Peru. The available data shows that several crop varieties are contaminated with these classes of chemical contaminants, and at levels that exceed the national and international permissible limits. The abundance of chemical contaminants in produce indicates a relevant food-safety issue, which increases the risks of chronic human diseases, like cancer-a leading cause of death in Peru. Finally, this review presents recommendations to address these contamination problems in produce grown in the Andean country.

Food safety in Peru: A review of fresh produce production and challenges in the public health system.

Peru has a commodities-based economy where agriculture plays an essential role in the nation's development. Among agricultural products, fruits and vegetables are foundational to Peruvian culture and a healthy and nutritious diet. Produce is also the primary income source for thousands of small-scale farmers and producers throughout the country. Peru has significant potential to export agricultural and value-added products. Nevertheless, the Peruvian food chain has weak food safety and quality standards, limiting access to international markets. The inherent lack of food safety surveillance and management systems negatively affects public health. In the past decade, fresh and raw produce has been associated with several foodborne outbreaks worldwide, resulting in significant health and economic losses. This alarming situation for public health officials and regulators has called for the strengthening of produce safety standards and food safety risk management for safer food and to reduce the incidence of foodborne illnesses. This review summarizes the current status of produce safety in Peru and explores opportunities (e.g., policy, university capacity development) toward a safer food system.

Epidemiology of dengue and other arboviruses in a cohort of school children and their families in Yucatan, Mexico: Baseline and first year follow-up.

Dengue is the most prevalent mosquito-borne viral disease of humans and is caused by the four serotypes of dengue virus. To estimate the incidence of dengue and other arboviruses, we analyzed the baseline and first year follow-up of a prospective school-based cohort study and their families in three cities in the state of Yucatan, Mexico. Through enhanced surveillance activities, acute febrile illnesses in the participants were detected and yearly blood samples were collected to evaluate dengue infection incidence. A Cox model was fitted to identify hazard ratios of arboviral infections in the first year of follow-up of the cohort. The incidence of dengue symptomatic infections observed during the first year of follow-up (2015-2016) was 3.5 cases per 1,000 person-years (95% CI: 1.9, 5.9). The incidence of dengue infections was 33.9 infections per 1,000 person-years (95% CI: 31.7, 48.0). The majority of dengue infections and seroconversions were observed in the younger age groups (≤ 14 years old). Other arboviruses were circulating in the state of Yucatan during the study period. The incidence of symptomatic chikungunya infections was 8.6 per 1,000 person-years (95% CI: 5.8, 12.3) and the incidence of symptomatic Zika infections was 2.3 per 1,000 person-years (95% CI: 0.9, 4.5). Our model shows that having a dengue infection during the first year of follow-up was significantly associated with being female, living in Ticul or Progreso, and being dengue naïve at baseline. Age was not significantly associated with the outcome, it was confounded by prior immunity to dengue that increases with age. This is the first report of a cohort in Latin America that provides incidence estimates of the three arboviruses co-circulating in all age groups. This study provides important information for understanding the epidemiology of dengue and other arboviruses and better informing public health policies.

Functional Class I and II Amino Acid-activating Enzymes Can Be Coded by Opposite Strands of the Same Gene.

Aminoacyl-tRNA synthetases (aaRS) catalyze both chemical steps that translate the universal genetic code. Rodin and Ohno offered an explanation for the existence of two aaRS classes, observing that codons for the most highly conserved Class I active-site residues are anticodons for corresponding Class II active-site residues. They proposed that the two classes arose simultaneously, by translation of opposite strands from the same gene. We have characterized wild-type 46-residue peptides containing ATP-binding sites of Class I and II synthetases and those coded by a gene designed by Rosetta to encode the corresponding peptides on opposite strands. Catalysis by WT and designed peptides is saturable, and the designed peptides are sensitive to active-site residue mutation. All have comparable apparent second-order rate constants 2.9-7.0E-3 M(-1) s(-1) or ∼750,000-1,300,000 times the uncatalyzed rate. The activities of the two complementary peptides demonstrate that the unique information in a gene can have two functional interpretations, one from each complementary strand. The peptides contain phylogenetic signatures of longer, more sophisticated catalysts we call Urzymes and are short enough to bridge the gap between them and simpler uncoded peptides. Thus, they directly substantiate the sense/antisense coding ancestry of Class I and II aaRS. Furthermore, designed 46-mers achieve similar catalytic proficiency to wild-type 46-mers by significant increases in both kcat and Km values, supporting suggestions that the earliest peptide catalysts activated ATP for biosynthetic purposes.

The Rodin-Ohno hypothesis that two enzyme superfamilies descended from one ancestral gene: an unlikely scenario for the origins of translation that will not be dismissed.

BACKGROUND: Because amino acid activation is rate-limiting for uncatalyzed protein synthesis, it is a key puzzle in understanding the origin of the genetic code. Two unrelated classes (I and II) of contemporary aminoacyl-tRNA synthetases (aaRS) now translate the code. Observing that codons for the most highly conserved, Class I catalytic peptides, when read in the reverse direction, are very nearly anticodons for Class II defining catalytic peptides, Rodin and Ohno proposed that the two superfamilies descended from opposite strands of the same ancestral gene. This unusual hypothesis languished for a decade, perhaps because it appeared to be unfalsifiable. RESULTS: The proposed sense/antisense alignment makes important predictions. Fragments that align in antiparallel orientations, and contain the respective active sites, should catalyze the same two reactions catalyzed by contemporary synthetases. Recent experiments confirmed that prediction. Invariant cores from both classes, called Urzymes after Ur = primitive, authentic, plus enzyme and representing ~20% of the contemporary structures, can be expressed and exhibit high, proportionate rate accelerations for both amino-acid activation and tRNA acylation. A major fraction (60%) of the catalytic rate acceleration by contemporary synthetases resides in segments that align sense/antisense. Bioinformatic evidence for sense/antisense ancestry extends to codons specifying the invariant secondary and tertiary structures outside the active sites of the two synthetase classes. Peptides from a designed, 46-residue gene constrained by Rosetta to encode Class I and II ATP binding sites with fully complementary sequences both accelerate amino acid activation by ATP ~400 fold. CONCLUSIONS: Biochemical and bioinformatic results substantially enhance the posterior probability that ancestors of the two synthetase classes arose from opposite strands of the same ancestral gene. The remarkable acceleration by short peptides of the rate-limiting step in uncatalyzed protein synthesis, together with the synergy of synthetase Urzymes and their cognate tRNAs, introduce a new paradigm for the origin of protein catalysts, emphasize the potential relevance of an operational RNA code embedded in the tRNA acceptor stems, and challenge the RNA-World hypothesis.

[Near drowning in a pediatric population: epidemiology and prognosis]. / Casi ahogamiento en pediatría: epidemiología y factores pronósticos.

INTRODUCTION: Submersion injury is associated with high morbidity and mortality, being the third leading cause of accidental death among children. OBJECTIVES: To analyze and describe risk factors, prognosis, and survival of victims, admitted to a third level Community Teaching Hospital. Population, material and methods. A retrospective, observational, analytical study. We studied patients admitted to the pediatric critical care unit, between 06/2000 and 01/2008. The following variables were analyzed: age, sex, length of stay, days of mechanical ventilation, Glasgow Coma Scale (GCS) score, apnea, bradycardia; baseline, 24 and 48 h lactacidemia, submersion time, swimming pool watchers of the victims. Stata 8.0 software was used; continuous variables were analyzed using Wilcoxon test; for categorical variables Z test and Chi square test were used, and a logistic regression analysis was performed. RESULTS: 30 near-drowning victims were admitted, median age was 25 months (R = 11-144 months). 41.3% occurred during summer, 60% were under parental supervision. Sibling supervision was associated with an increased risk of near-drowning (RR: 2.1; 95% CI 1.1-3.2). Immersion time was > 10 minutes in 3.4%; 26% had apnea, and the GCS score was < 5 in 19.99%. Lactic acid at admission was > 3 mmol/l in 10 patients. Risk factors like glucose level > or = 300 mg% (OR: 3.325), apnea (OR: 2.752), bradycardia (OR: 4.74), GCS <5 (OR: 3.550) and inmersion time > 10 minutes (OR: 5.12), were associated with poor prognosis. Mortality was 2/30 patients. CONCLUSION: In our population, the presence of apnea, bradycardia, GCS <5, glucose level > or = 300 mg%, submersion time > 10 minutes, and lactic acid > 6 mmol/l at admission and the first 24 h, were associated with a poor prognosis and serious injury.

Casi ahogamiento en pediatría: epidemiología y factores pronósticos / Near drowning in a pediatric population: epidemiology and prognosis

Introducción. El ahogamiento por sumersión es un cuadro con alta morbimortalidad; es la tercera causa accidental de muerte en la población infantil. El objetivo fue analizar y describir factores de riesgo, pronóstico y supervivencia de las víctimas por casi ahogamiento, admitidas en un hospital universitario de alta complejidad. Población, material y métodos. Estudio retrospectivo, observacional, analítico. Se estudiaron los pacientes admitidos en una Unidad de Cuidados Intensivos Pediátricos, entre junio del año 2000 y enero de 2008. Se analizaron múltiples variables. Resultados. Ingresaron 30 pacientes, cuya mediana de edad fue 25 meses (intervalo: 11-144 meses), predominio masculino. El 41,3 por ciento de los episodios ocurrieron en verano, 60 por ciento de los niños estaba bajo supervisión de los padres. El tiempo medio de sumersión fue > 10 minutos en el 3,4 por ciento, tuvieron apnea al ingreso 26 por ciento y el Puntaje de Glasgow fue < 5 en 19,99 por ciento. El ácido láctico fue mayor a 3 mmol/l en 10 pacientes. Se asociaron con mal pronóstico, quienes al ingreso tuvieron glucemia ≥ 300 mg por ciento (OR: 3,325), apnea (OR: 2,752), bradicardia (OR: 4,74), Glasgow < 5 (OR: 3,550) y tiempo de sumersión > a 10 minutos (OR: 5,12). Murieron 2/30 pacientes. Conclusión. En nuestra población, la presencia de apneas, bradicardia, glucemia ≥ 300 mg por ciento, Puntaje de Glasgow < 5 y sumersión mayor a 10minutos, se asociaron a mal pronóstico. La elevación de ácido láctico > 6 mmol/l al ingreso y a las 24 h fue marcador de lesión grave.(AU)

Casi ahogamiento en pediatría: epidemiología y factores pronósticos / Near drowning in a pediatric population: epidemiology and prognosis

Introducción. El ahogamiento por sumersión es un cuadro con alta morbimortalidad; es la tercera causa accidental de muerte en la población infantil. El objetivo fue analizar y describir factores de riesgo, pronóstico y supervivencia de las víctimas por casi ahogamiento, admitidas en un hospital universitario de alta complejidad. Población, material y métodos. Estudio retrospectivo, observacional, analítico. Se estudiaron los pacientes admitidos en una Unidad de Cuidados Intensivos Pediátricos, entre junio del año 2000 y enero de 2008. Se analizaron múltiples variables. Resultados. Ingresaron 30 pacientes, cuya mediana de edad fue 25 meses (intervalo: 11-144 meses), predominio masculino. El 41,3 por ciento de los episodios ocurrieron en verano, 60 por ciento de los niños estaba bajo supervisión de los padres. El tiempo medio de sumersión fue > 10 minutos en el 3,4 por ciento, tuvieron apnea al ingreso 26 por ciento y el Puntaje de Glasgow fue < 5 en 19,99 por ciento. El ácido láctico fue mayor a 3 mmol/l en 10 pacientes. Se asociaron con mal pronóstico, quienes al ingreso tuvieron glucemia ≥ 300 mg por ciento (OR: 3,325), apnea (OR: 2,752), bradicardia (OR: 4,74), Glasgow < 5 (OR: 3,550) y tiempo de sumersión > a 10 minutos (OR: 5,12). Murieron 2/30 pacientes. Conclusión. En nuestra población, la presencia de apneas, bradicardia, glucemia ≥ 300 mg por ciento, Puntaje de Glasgow < 5 y sumersión mayor a 10minutos, se asociaron a mal pronóstico. La elevación de ácido láctico > 6 mmol/l al ingreso y a las 24 h fue marcador de lesión grave.