Alterations on the evapotranspiration of sugarcane cultivars under distinct salinity levels applied in the fertigation

The aim of this research was to evaluate the effect of distinct levels of salinity on the evapotranspiration of the RB867515, RB855453, RB92579 and RB928064 sugarcane cultivars. The evapotranspiration was monitored during daytime period under meteorological conditions influenced, mainly by cloud variations. The salinity values were established by addition of 0, 50, 100 and 150 mM of Sodium Chloride (NaCl) to the nutrient solution, which was applied by fertigation, in such way that the electrical conductivity (EC) of the leached solution was near 3, 6, 10 and 13 dS m -1 , respectively. The increase of the NaCl concentration in the nutrient solution affected, significantly and in a linear manner, the evapotranspiration of all sugarcane cultivars, such that the days with low cloud provided the highest evapotranspiration values and the greater reduction among salinity levels. Analysis of the evapotranspiration accumulated during the daytime period showed that there were no significant differences among sugarcane cultivars and that, under the highest atmospheric water demand, the evapotranspiration decreased 48.5 g plant -1 EC -1 . This value represents the average reduction of 5.1% EC -1 when compared to the treatment without NaCl, considering data of all cultivars

Comportamento do consumidor em resposta aos efeitos da pandemia da covid-19: um estudo sobre a relação entre a intenção de autoisolamento e compras incomuns

Purpose: The aim of this study is to investigate consumer behavior in the context of the COVID-19 pandemic in Brazil to assess the relationship between the intention of self-isolation and to make unusual purchases. Methodology /Approach: Through an online survey with a sample of 181 individuals in Brazil, the proposed model and hypotheses were tested using Structural Equation Modeling (PLS-SEM.) Findings: The results demonstrate a link between perceived severity in the two behavioral responses measured, the intention to make unusual purchases and, more strongly, the intention to voluntary self-isolation. Originality/Value: The study discusses consumer behavior for unusual purchases (cyberchondria) in risky situations such as the COVID-19 pandemic in Brazil. Contributions and implications: We demonstrate how information overload leads to cyberchondria. In addition, the perceived severity leads the individual to make unusual purchases and self-isolation. In turn, exposure to online information sources leads to cyberchondria, which leads to behavior that increases the intention to make unusual purchases, and to self-isolation, which further increases exposure to online information. Furthermore, this study extends existing research (Laato et al., 2020) that suggests that research be carried out in different contexts.Objetivo: o propósito deste estudo é investigar o comportamento dos consumidores no contexto da pandemia de COVID-19 no Brasil para avaliar a relação entre a intenção de auto isolamento e eventuais compras incomuns. Método: Por meio de uma pesquisa on-line com uma amostra 181 indivíduos, o modelo proposto e as hipóteses foram testadas a partir da Modelagem de Equações Estruturais (PLS-SEM.)  Principais resultados: Os resultados demonstram ligação entre gravidade percebida nas duas respostas comportamentais medidas, a intenção de fazer comprar incomuns e, mais fortemente, a intenção de autoisolamento voluntário. Relevância/originalidade: O estudo traz para discussão o comportamento do consumidor para compras incomuns (cibercondria) em situações de risco como a pandemia da COVID-19 no Brasil. Contribuições e implicações: Demonstramos como a sobrecarga de informação leva à cibercondria. Além disso, que a gravidade percebida leva o indivíduo a fazer compras incomuns e ao autoisolamento. Por sua vez, a exposição a fontes de informação on-line leva à cibercondria, que leva a um comportamento que aumenta a intenção de fazer compras incomuns e ao autoisolamento o que aumenta ainda mais a exposição a informações on-line. Além disso, este estudo estende a pesquisa existente (Laato et al., 2020) que sugere que pesquisas sejam realizadas em contextos diferentes

Improving physical activity behaviors, physical fitness, cardiometabolic and mental health in adolescents - ActTeens program : a protocol for a randomized controlled trial

This trial aims to investigate the effects of the ActTeens physical activity program, on adolescents' physical activity level, health-related fitness, cardiometabolic and mental health. The trial will aim to recruit ∼140 adolescents (aged 13-14 years). Participants will be randomized into either intervention or control groups. The intervention will be guided by social cognitive theory and self-determination theory and implemented over one school term (24- weeks). The ActTeens Program will include: (1) structured physical activity sessions delivered within physical education, including movement-based games and dynamic stretching warm-ups; resistance training skill development; high-intensity training workouts; and cooldowns; (2) self-monitoring plus goal setting for physical activity by pedometer-smart wearable; and (3) healthy lifestyle guidance (social support) by WhatsApp® messages about healthy eating and regular physical activity for the intervention and parents groups. Study outcomes will be assessed at baseline, 24-weeks from baseline, and 12-months from baseline. Physical activity (accelerometer) is the primary outcome. Secondary outcomes include muscular and cardiorespiratory fitness, cardiometabolic profile, and mental health. A process evaluation will be conducted (i.e., recruitment, retention, attendance, and program satisfaction). This project will have the potential to address many questions and debates regarding the implementation of physical activity interventions in low-and- middle-income countries

Insecticide resistance in Aedes aegypti populations from Ceará, Brazil

<p>Abstract</p> <p>Background</p> <p>Organophosphates and pyrethroids are used widely in Brazil to control <it>Aedes aegypti</it>, the main vector of dengue viruses, under the auspices of the National Programme for Dengue Control. Resistance to these insecticides is widespread throughout Brazil. In Ceará the vector is present in 98% of districts and resistance to temephos has been reported previously. Here we measure resistance to temephos and the pyrethroid cypermethrin in three populations from Ceará and use biochemical and molecular assays to characterise resistance mechanisms.</p> <p>Results</p> <p>Resistance to temephos varied widely across the three studied populations, with resistance ratios (RR₉₅) of 7.2, 30 and 192.7 in Juazeiro do Norte, Barbalha and Crato respectively. The high levels of resistance detected in Barbalha and Crato (RR₉₅≥ 30) imply a reduction of temephos efficacy, and indeed in simulated field tests reduced effectiveness was observed for the Barbalha population. Two populations (Crato and Barbalha) were also resistant to cypermethrin, whilst Juazeiro do Norte showed only an altered susceptibility. The <it>Ile1011Met kdr </it>mutation was detected in all three populations and <it>Val1016Ile </it>in Crato and Juazeiro do Norte. <it>1011Met </it>was significantly associated with resistance to cypermethrin in the Crato population. Biochemical tests showed that only the activity of esterases and GSTs, among the tested detoxification enzymes, was altered in these populations when compared with the Rockefeller strain.</p> <p>Conclusions</p> <p>Our results demonstrate that two <it>A. aegypti </it>populations from Ceará are under strong selection pressure by temephos, compromising the field effectiveness of this organophosphate. Our results also provide evidence that the process of reducing resistance to this larvicide in the field is difficult and slow and may require more than seven years for reversal. In addition, we show resistance to cypermethrin in two of the three populations studied, and for the first time the presence of the allele <it>1016Ile </it>in mosquito populations from northeastern Brazil. A significant association between <it>1011M</it>et and resistance was observed in one of the populations. Target-site mechanisms seem not to be implicated in temephos resistance, reinforcing the idea that for the studied populations, detoxification enzymes most likely play a major role in the resistance to this insecticide.</p

Maintenance and Growth Requirements in Male Dorper × Santa Ines Lambs

The aim of this study was to estimate the energy and protein requirements for maintenance and growth of lambs. A total of 35 crossbreed Dorper × Santa Ines lambs [31 ± 1.28 kg of initial body weight (BW) and 4 months old] were distributed in a completely randomized design with three treatments groups (ad libitum, 30 and 60% of feed restriction). Five lambs were slaughtered at the beginning of the experimental trial as a reference group to estimate the initial empty BW (EBW) and body composition. When the animals of the ad libitum treatment reached a BW average of 47.2 kg, at day 84 of trial, all lambs were slaughtered. The feed restriction promoted reduction in body fat (P &lt; 0.001) and energy concentration (P &lt; 0.001), while protein showed a quadratic response (P = 0.05). The equations obtained for NEg and NPg requirements were 0.2984 × EBW0.75 × EBWG0.8069 and 248.617 × EBW−0.15546, respectively. The net energy (NEm) and protein (NPm) for maintenance were 71.00 kcal/kg EBW0.75/day and 1.76 g/kg EBW0.75/day, respectively. In conclusion, the NEg and NPg requirement for lambs with 30 kg of BW and 200 g of average daily gain (ADG) were 0.736 Mcal/day and 24.38 g/day, respectively. Our findings indicate that the NEm for crossbreed Dorper × Santa Ines lambs is similar to those recommended by the international committees; however, we support the hypothesis that the requirements for gain are lower