The study evaluated the effects of different types of dietary carbohydrates on growth, immunity, antioxidant capacity and glucose metabolism enzyme activities in the juvenile brook trout. Fish (13.65 ± 0.06 g) were fed five isonitrogenous and isolipidic diets that contained 150g kg-1 glucose, sucrose, dextrin, pregelatinized corn starch (PS) or raw corn starch (RS) respectively. Weight gain, specific growth rate and protein efficiency ratio were significantly higher in fish fed dextrin than the other treatments. The serum alanine aminotransferase (ALT), aspartate transaminase (AST), alkaline phosphatase (AKP) and glucose were higher in fish fed glucose than those fed dextrin, PS or RS. Hepatic superoxide dismutase (SOD), catalase (CAT) and lysozyme activity, as well as total antioxidant capacity, were lower in fish fed glucose or sucrose than the other treatments. Moreover, the highest malondialdehyde (MDA) level was reported in the glucose group. Furthermore, fish fed glucose had significantly lower hepatic glucokinase (GK), phosphofructokinase (PFK) and phosphoenolpyruvate carboxykinase (PEPCK) activities than those fed dextrin, PS or RS. The results suggest that dextrin is the optimal carbohydrate source for brook trout, while incorporating glucose into the diet suppresses innate immunity, increases oxidative stress and interferes with glucose metabolism, resulting into a reduction in growth.

Background Traditional models of mental health focus on psychopathological symptoms. In contrast, the dual-factor model of mental health integrates positive mental health and psychopathology into a mental health continuum, which is an adaptation and complement to the traditional mental health research paradigm. The new generation of migrant workers is an important part of current Chinese society. Their identity has created a sense of loneliness, rootlessness, and alienation. This paper validates the applicability of the dual-factor model of mental health among new generation migrant workers in China. Methods In this study, 600 new generation migrant workers were recruited and tested on the symptom checklist 90, satisfaction with life scale, perceived stress scale, employee engagement inventory. Descriptive statistics and ANOVA were performed, the differences between the unidimensional model and dual-factor model were also tested. Results The results showed that the dual-factor model of the mental health approach had better construct validity than the unidimensional model. And four subgroups could be significantly discriminated by the dual-factor model: mentally healthy (58.45%), vulnerable (30.87%), symptomatic but content (3.11%), and troubled (7.57%). Compared to the other three groups, workers who were mentally healthy showed higher perceived work values and lower perceived work stress. Conclusions The study suggests that a dual-factor model of mental health can be applied to new generation migrant workers in China, with positive mental health and psychopathology being important predictors of mental health.

Propsilocerus akamusi is one of the most important genera of Chironomidae. However, the systemically classification and taxonomic studies have so far been limited. In this study, we report the complete mitochondrial genome sequence of P . akamusi . The mitogenome has 15,632 base pairs (77.58% A + T content) and made up of total of 37 genes (13 protein-coding, 22 transfer RNAs, and 2 ribosomal RNAs). This study will provide useful genetic information for future phylogenetic and taxonomic classification of Chironomidae.

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