Exploring suicide ideation in university students: sleep quality, social media, self-esteem, and barriers to seeking psychological help.

The purpose of the current study is to analyze how variations in suicidal ideation scores can relate to sleep quality, social media consumption, self-esteem, and perceived barriers to seeking psychological help in a sample of university students in Honduras. A quantitative cross-sectional design was used. Self-reported data was collected from a non-random sample of 910 university students in Honduras; their average age was 24.03 years (SD=6.05). Most respondents were women (67%) with men accounting for 33% of the sample. Measurements included item 9 of the Patient Health Questionnaire-9, the Single-Item Sleep Quality Scale, Rosenberg's Self-Esteem Scale, Barriers to Seeking Psychological Help Scale for College Students, and a self-reported questionnaire on social media. In response to the query, "Over the past two weeks, how frequently have you experienced thoughts that you would be better off dead or of hurting yourself?" 54% (n=495) of participants indicated "not at all" 18% (n=168) reported "several days" 14% (n=129) responded "more than half of the days" and 13% (n=118) stated "nearly every day". The results from the ordinal logistic regression model indicate that sleep quality and self-esteem serve as protective factors associated with decreased suicide ideation. At the same time, a higher number of social media platforms used per week and perceived barriers to seeking psychological help increase suicide ideation. Altogether, these variables explained 19% of the variance in suicidal ideation scores. Suicidal ideation is highly prevalent among the sampled university students.

Genomic data mining reveals the transaminase repertoire of Komagataella phaffii (Pichia pastoris) strain GS115 and supports a systematic nomenclature.

Transaminases are an industrially important class of enzyme, due to their ability to catalyse amination reactions for production of chiral amines, and are key building blocks of small molecule pharmaceuticals. We analysed the genome of strain GS115 of the methylotrophic yeast Komagataella phaffii, formerly known as Pichia pastoris, to identify the transaminase genes and propose a systematic nomenclature based on both phylogeny and structuro-functional features. K. phaffii is an increasingly attractive industrial host cell due to its ability to grow to high biomass, up to 60% wet cell weight by volume, using methanol as carbon source and inducer of transgene expression. Thirty-nine UniProt database hits were reduced to 19 on the basis of sequence similarity and hidden Markov model. Of the 19 genes, the open-reading frames of three (KpTam I-II.1b, KpTam I-II.7 and KpTam V.2) had strong homology with no characterized proteinand four (KpTam III.1a, KpTam III.1b, KpTam III.2a and KpTam III.2b) had relatively high sequence similarity to x-type transaminases, a subtype that typically accepts the broadest range of substrates. Comparison with Saccharomyces cerevisiae S288C suggested functions for KpTam I-II.1b and KpTam I-II.7. K. phaffii GS115 was originally generated by mutagenesis of K. phaffii CBS7435 and comparison revealed that one transaminase gene may have been deleted during this mutagenesis. These insights can advance fundamental understanding of yeast biology and can inform industrial screening and engineering of yeast transaminases.

Whole cell biosynthetic activity of Komagataella phaffii (Pichia pastoris) GS115 strains engineered with transgenes encoding Chromobacterium violaceum ω-transaminase alone or combined with native transketolase.

Whole cell biocatalysis is an ideal tool for biotransformations that demand enzyme regeneration or robustness to fluctuating pH, osmolarity and biocontaminant load in feedstocks. The methylotrophic yeast Komagataella phaffii is an attractive alternative to Escherichia coli for whole cell biocatalysis due to its genetic tractability and capacity to grow to up to 60% wet cell weight by volume. We sought to exploit high cell density K. phaffii to intensify whole-cell chiral amino-alcohol (CAA) biosynthesis. We engineered two novel K. phaffii GS115 strains: one by inserting a Chromobacterium violaceum ω-transaminase CV2025 transgene, for strain PpTAmCV708, and a second strain, PpTAm-TK16, by also inserting the same CV2025 transgene plus a second transgene for a native transketolase. At high cell density, both strains tolerated high substrate concentrations. When fed three low cost substrates, 200 mM glycolaldehyde, 200 mM hydroxypyruvate and 150 mM methylbenzylamine, PpTAm-TK16 whole cells achieved 0.29 g L-1 hr-1 space-time yield of the acetophenone by-product, a 49-fold increase of the highest levels reported for E. coli whole cells harboring the equivalent pathway. When fed only the low-cost substrate, 150 mM methylbenzylamine, strain PpTAmCV708 achieved a 105-fold increase of reported E. coli whole cell biocatalysis performance, with a space-time yield of 0.62 g L-1 hr-1 of the CAA, 2-amino-1,3,4-butanetriol (ABT). The rapid growth and high biomass characteristics of K. phaffii were successfully exploited for production of ABT by whole-cell biocatalysis at higher levels than the previously achieved with E. coli in the presence of the same substrates.

Assessment of EPInfant scale for exercise intensity perceptual self-regulation in healthy children. / Evaluación de la escala EPInfant para la auto-regulación perceptual de la intensidad del ejercicio en niños sanos.

INTRODUCTION: The EPInfant scale has been validated for the perceptual estimation of physical exer tion in Chilean children, but its usefulness for self-regulation of exercise intensity is unknown. The objective of the study was to evaluate the criterion validity of the EPInfant scale to regulate and re produce exercise intensity in a sample of healthy children. SUBJECTS AND METHOD: 15 children between the ages of eight and 12 were selected for an incremental exercise test (IET) and three perceptually regulated exercise tests (PRET) on a treadmill. The tests were performed with a 48-hour interval between them. In the PRET, the exercise load was adjusted perceptually for five minutes, randomly considering levels 3, 6, and 9 of the EPInfant scale. The average heart rate (HR) during PRET was considered as the perceptually reproduced intensity. Variance analysis, simple linear regression, and reliability analysis were used to determine the reproducibility of HR during PRET. RESULTS: There was a significant difference in HR between perceptual levels during PRET (p < 0.001). Additionally, a correlation was observed between HR during the IET and the PRET (r = 0.83, r2 = 0.69). The intra class correlation coefficient was 0.76, 0.83. and 0.93 at perceptual levels 3, 6, and 9; and the mean dis cordance between HR during the IET and the PRET was -2.4 beats/min. CONCLUSION: In the studied sample, the EPInfant scale was valid to allow the perceptual regulation and reproduction of exercise intensity in a treadmill.

Odontodisplasia Regional y Agenesia de Premolares. Reporte de un Caso / Regional Odontodysplasia and Premolar Agenesis. Case Report

RESUMEN: La odontodisplasia regional (OR) es una alteración en el desarrollo, no hereditario y que afecta tanto la dentición temporal como la dentición definitiva. Involucra a los tejidos mesodérmicos y ectodérmicos de los dientes lo que es condescendiente con hallazgos clínicos, radiográficos e histológicos. Su etiología aun es desconocida y se presenta mayoritariamente en mujeres. Clínicamente puede afectar al maxilar, a la mandíbula o ambas arcadas pero generalmente solo se ve comprometida una ellas, principalmente el más afectado es el hueso maxilar. Radiográficamente se observa una pobre diferencia entre los tejidos del esmalte y la dentina, siendo tejidos menos radiopacos que su contraparte sana generando un aspecto descrito como "diente fantasma". Histológicamente se observan zonas hipocalcificadas del esmalte con un orden de prismas irregulares mientras que la dentina se observa con un número reducido de túbulos dentinarios y de consistencia más fibrosa en su zona coronal. El tratamiento de la OR es controversial ya que su incidencia es baja y la literatura al respecto no es clara. El objetivo de este manuscrito, fue reportar un caso de OR y revisar la literatura relacionada. Presentamos un caso de OR en una paciente de 12 años que presenta ausencia de los dientes 2.4, 2.5 y 2.6; restos radiculares y agenesia de los dientes 3.5 y 4.5. Se describirán sus aspectos clínicos, radiográficos e histológicos. Se realizó una búsqueda sistemática en las siguientes bases de datos: Clínical key, Science Direct, PubMed y SciELO.

ABSTRACT: Regional odontodysplasia (RO) is a variation in the development; it is not hereditary and it affects both deciduous and permanent dentition. It involves the mesodermal and ectodermal tissues of dental pieces, and coincides with clinical, radiographic and histological findings. Its etiology is still unknown and it reportedly occurs mostly in women. Clinically it can affect the maxilla, mandible or both arches but generally only one is compromised, mainly the maxilla which is affected the most. Radiographically there is limited difference between enamel and dentin tissue, which is less radiopaque than their healthy counterpart, generating an aspect described as "phantom tooth". Histologically hypocalcified areas of the enamel are observed with an irregular order of prisms while the dentine is observed with a reduced number of dentinal tubules and more fibrous consistency in the coronal area. RO treatment is controversial since its incidence is low and the literature on these events is not clear. The aim of this manuscript was to report a case of RO and review related literature. We present a case of RO in a 12-year-old patient who presents absence of parts 2.4.2.5 and 2.6; radicular remains and agenesis of parts 3.5 and 4.5. Its clinical, radiographic and histological aspects are described. A systematic search was carried out in the following databases: Clinical key, Science Direct, PubMed and SciELO.

Whole cell biosynthesis of 1-methyl-3-phenylpropylamine and 2-amino-1,3,4-butanetriol using Komagataella phaffii (Pichia pastoris) strain BG-10 engineered with a transgene encoding Chromobacterium violaceum ω-transaminase.

We have engineered strain BG-10 of the methylotrophic yeast Komagataella phaffii for use as an effective whole cell biocatalyst. We introduced into the yeast a transgene encoding a Chromobacterium violaceum ω-transaminase for transcription in response to methanol induction. The strain was then assessed with respect to its growth performance and biotransformation of a fed ketoalcohol substrate to an amino-alcohol. In the resultant strain, BG-TAM, methanol induction did not compromise cell growth. Successful bioconversion of fed substrates to the by-product, acetophenone, indicated transaminase activity in shake flask-cultivated BG-TAM cells. We then used bioreactor cultivation to exploit the high levels of biomass achievable by Komagataella phaffii. In a 900 µL reaction the BG-TAM strain at OD600 = 1024 achieved up to 0.41 mol mol-1 (molproduct molsubstrate -1) yield on substrate (Yp/s) for production of 1-methyl-3-phenylpropylamine and a space time yield (STY) of 0.29 g L-1 h-1 for production of 2-amino-1,3,4-butanetriol. We have shown that transamination, an important step for bespoke synthesis of small molecule medicines, is biologically realisable using enzymes with a broad substrate range, such as ω-transaminases, within living yeast cells that are fed low-cost substrates for bioconversion.

Evaluación de la escala EPInfant para la auto-regulación perceptual de la intensidad del ejercicio en niños sanos / Assessment of EPInfant scale for exercise intensity perceptual self-regulation in healthy children

INTRODUCCIÓN: La escala EPInfant ha sido validada para la estimación perceptual del esfuerzo físico en niños chile nos, pero se desconoce su utilidad para la autorregulación de la intensidad del ejercicio. OBJETIVO: evaluar la validez de criterio de la escala EPInfant para regular y reproducir la intensidad de ejercicio en una muestra de niños sanos. SUJETOS Y MÉTODO: Se seleccionaron 15 niños entre 8 y 12 años, en quienes se realizó un test de carga incremental (TCI) y tres pruebas de regulación perceptual (PRP) en trotadora. Las pruebas se realizaron con un intervalo de 48 horas entre ellas. En la PRP, la carga de trabajo se ajustó perceptualmente durante 5 minutos, considerando aleatoriamente los niveles 3, 6 y 9 de la escala EPInfant. Se consideró el promedio de la FC durante la PRP como la intensidad reproducida perceptualmente. Se empleó análisis de varianza, regresión lineal simple y análisis de confiabilidad para determinar la reproducibilidad de la FC durante la PRP. RESULTADOS: Existió diferencia significativa en la FC entre los niveles perceptivos durante la PRP (p < 0,001). Adicional mente, se observó correlación entre la FC durante el TCI y la PRP (r = 0,83; r2 = 0,69). El coeficiente de correlación intraclase fue de 0,76, 0,83 y 0,93 en los niveles perceptivos 3, 6 y 9; y la discordancia media entre la FC durante el TCI y la PRP fue de -2,4 lat/min. CONCLUSIÓN: En la muestra estudiada, la escala EPInfant fue válida para permitir la regulación y reproducción perceptual de la intensidad del ejercicio en trotadora.

INTRODUCTION: The EPInfant scale has been validated for the perceptual estimation of physical exer tion in Chilean children, but its usefulness for self-regulation of exercise intensity is unknown. The objective of the study was to evaluate the criterion validity of the EPInfant scale to regulate and re produce exercise intensity in a sample of healthy children. SUBJECTS AND METHOD: 15 children between the ages of eight and 12 were selected for an incremental exercise test (IET) and three perceptually regulated exercise tests (PRET) on a treadmill. The tests were performed with a 48-hour interval between them. In the PRET, the exercise load was adjusted perceptually for five minutes, randomly considering levels 3, 6, and 9 of the EPInfant scale. The average heart rate (HR) during PRET was considered as the perceptually reproduced intensity. Variance analysis, simple linear regression, and reliability analysis were used to determine the reproducibility of HR during PRET. RESULTS: There was a significant difference in HR between perceptual levels during PRET (p < 0.001). Additionally, a correlation was observed between HR during the IET and the PRET (r = 0.83, r2 = 0.69). The intra class correlation coefficient was 0.76, 0.83. and 0.93 at perceptual levels 3, 6, and 9; and the mean dis cordance between HR during the IET and the PRET was -2.4 beats/min. CONCLUSION: In the studied sample, the EPInfant scale was valid to allow the perceptual regulation and reproduction of exercise intensity in a treadmill.

Biotransformation of ß-hydroxypyruvate and glycolaldehyde to l-erythrulose by Pichia pastoris strain GS115 overexpressing native transketolase.

Transketolase is a proven biocatalytic tool for asymmetric carbon-carbon bond formation, both as a purified enzyme and within bacterial whole-cell biocatalysts. The performance of Pichia pastoris as a host for transketolase whole-cell biocatalysis was investigated using a transketolase-overexpressing strain to catalyze formation of l-erythrulose from ß-hydroxypyruvic acid and glycolaldehyde substrates. Pichia pastoris transketolase coding sequence from the locus PAS_chr1-4_0150 was subcloned downstream of the methanol-inducible AOX1 promoter in a plasmid for transformation of strain GS115, generating strain TK150. Whole and disrupted TK150 cells from shake flasks achieved 62% and 65% conversion, respectively, under optimal pH and methanol induction conditions. In a 300 µL reaction, TK150 samples from a 1L fed-batch fermentation achieved a maximum l-erythrulose space time yield (STY) of 46.58 g L-1 h-1 , specific activity of 155 U gCDW-1, product yield on substrate (Yp/s ) of 0.52 mol mol-1 and product yield on catalyst (Yp/x ) of 2.23g gCDW-1. We have successfully exploited the rapid growth and high biomass characteristics of Pichia pastoris in whole cell biocatalysis. At high cell density, the engineered TK150 Pichia pastoris strain tolerated high concentrations of substrate and product to achieve high STY of the chiral sugar l-erythrulose. © 2017 The Authors Biotechnology Progress published by Wiley Periodicals, Inc. on behalf of American Institute of Chemical Engineers Biotechnol. Prog., 34:99-106, 2018.