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Positive Psychology has been devoted to enhancing well-being within organizations during the first two decades of the current millennium. Unfortunately, little data is available on current assessment related to positive psychology practices in the workplace. Therefore, to assess organizational well-being in a valid and reliable way, a new scale has been created and validated by the Institute for Wellbeing and Happiness at Tecmilenio University in Mexico: the BEAT Questionnaire whose main contribution to previous models is the element of meaningful work. EFA and CFA were carried out to determine and confirm the scale's structure; internal consistency tests were performed too; additionally, convergence with measures of engagement, labor resources, and worker relations were also confirmed, and discriminant validity was tested by comparing associations with job search intentions and negative relationships in the workplace, yielding an instrument with four clearly defined latent dimensions, composed by 24 highly consistent items, convergent with three other valid and reliable scales. All procedures complied with statistical requirements, delivering a valid and reliable instrument for measuring well-being in the workplace.

Every year in Mexico, around 300,000 people suffer from accidents related to scorpion stings. Among the scorpion species dangerous to human is Centruroides ornatus, whose venom characterization is described here. From this venom, a total of 114 components were found using chromatographic separation and mass spectrometry analysis. The most abundant ones have molecular masses between 3000-4000 Da and 6000-8000 Da respectively, similar to other known K + and Na + -channel specific scorpion peptides. Using intraperitoneal injections into CD1 mice, we were able to identify and fully sequenced three new lethal toxins. We propose to name them Co1, Co2 and Co3 toxins, which correspond to toxins 1 to 3 of the abbreviated species name (Co). Electrophysiology analysis of these peptides using heterologously expressed human Na + -channels revealed a typical β-toxin effect. Peptide Co52 (the most abundant peptide in the venom) showed no activity in our in vivo and in vitro model assays. A phylogenetic analysis groups the Co1, Co2 and Co3 among other β-toxins from Centruroides scorpions. Peptide Co52 segregates among peptides of unknown defined functions., (Copyright © 2019 Elsevier Ltd. All rights reserved.)

A majority of the sample of children (N = 160-121, ages 6-30 months) from the Mexico City Prospective Lead Study exceeds the lowest limit action level (10 micrograms/dl) of the Centers for Disease Control standards for childhood lead exposure. Over one-third of the sample at 18 months and 24 months exceeds the action level (15 micrograms/dl) for aggressive intervention. Diet plays an important role in regulating early childhood blood lead levels. Fresh milk and breast feeding are associated with lower lead levels, but extended breast feeding is related to elevated lead levels. Low income and poor maternal education are associated with higher lead concentration in children. Child consumption of canned milk and juice, up to this date, is associated with elevated child lead levels. Canned products sealed with lead are disappearing from Mexican markets. Efforts to improve childhood nutrition and poverty may be expected to have the additional benefit of lowering lead levels of Mexican children.

Multiple regression modeling was used to explore the relationship between prenatal and postnatal blood lead levels and child head circumference in the first three years of life. Maternal blood lead at 36 weeks of pregnancy and cord blood lead were found to be inversely related to 6 month and 18 month head circumference, respectively. Child 12 month blood lead was inversely related to 36 month head circumference. Limitations of the data set and the statistical techniques were discussed, as were the interpretations of the findings.

Lead levels in samples of the groups at highest risk to the effects of lead exposure, pregnant women and their infants, are higher than levels known to produce developmental retardation in children in a considerable proportion of the sample tested in Mexico City. Modeling of prenatal factors predicting maternal lead during pregnancy shows the strong effect of the use of low-temperature ceramics on lead level. The data also suggests an important contribution from air lead. The downward trend in lead exposure in pregnant women in the Valley of Mexico over the last 10 years, concurrent with downward trends in air lead is encouraging. However, reducing the manufacture and use of leaded pottery could produce a significant further reduction of lead exposure with a modest program of public education, government regulation and subsidization of lead free pottery.