Effects of rotation scheme on fishing behaviour with price discrimination and limited durability: Theory and evidence.

This paper examines how rotation arrangement between two groups of fishers with different institutional arrangements affects fishing behaviour and economic outcomes in a particular economic environment characterised by price discrimination and product durability. In one group, fishers cooperate and maximise the extraction of rents, while members in the second group behave non-cooperatively. Applying a model of alternating duopoly, we show that the cooperating group behaves like a price discriminating monopolist and tends to uphold prices. When the two groups rotate fishing days the cooperating group tends to produce more, which prevents the non-cooperating group from unprofitable demand pre-emption

Do Social Preferences Increase Productivity? Field experimental evidence from fishermen in Toyama Bay

We provide a reason for the wider economics profession to take social preferences, a concern for the outcomes achieved by other reference agents, seriously. Although we show that student measures of social preference elicited in an experiment have little external validity when compared to measures obtained from a field experiment with a population of participants who face a social dilemma in their daily lives (i.e., team production), we also find strong links between the social preferences of our field participants and their productivity at work

Do Social PreferencesIncrease Productivity? Field experimental evidence from fishermen in Toyoma Bay

We provide a reason for the wider economics profession to take social preferences, a concern for the outcomes achieved by other reference agents, seriously. Although, we show that student measures of social preference elicited in an experiment have little external validity when compared to measures obtained from a field experiment with a population of participants who face a social dilemma in their daily lives (i.e. team production), we do find strong links between the social preferences of our field participants and their productivity at work. We also find that the stock of social preferences evolves endogeously with respect to how widely team production is utilized.Field experiment, social preference, income pooling, productivity

Competitive Work Environments and Social Preferences: Field experimental evidence from a japanese fishing community

Models of job tournaments and competitive workplaces more generally predict that while individual effort may increase as competition intensifies between workers, the incentive for workers to cooperate with each other diminishes. We report on a field experiment conducted with workers from a fishing community in Toyama Bay, Japan. Our participants are employed in three different aspects of fishing. The first group are fishermen, the second group are fish wholesalers (or traders), and the third group are staff at the local fishing coop. Although our participants have much in common (e.g., their common relationship to the local fishery and the fact that they all live in the same community), we argue that they are exposed to different amounts of competition on-the-job and that these differences explain differences in cooperation in our experiment. Specifically, fisherman and traders, who interact in more competitive environments are significantly less cooperative than coop staff who face little competition on the job. Further, after accounting for the possibility of personality-based selection, perceptions of competition faced on-the-job and the treatment effect of job incentives explain these difference in cooperation to a large extent.Field experiment, cooperation, social disapproval, social preference, competition, Japan, fishing

Heterogeneous Productivity in Voluntary Public Good Provision: an Experimental Analysis

This article experimentally examines voluntary contributions when group members’ marginal returns to the public good vary. The experiment implements two marginal return types, low and high, and uses the information that members have about the heterogeneity to identify the applied contribution norm. We find that norms vary with the information environment. If agents are aware of the heterogeneity, contributions increase in general. However, high types contribute more than low types when contributions can be linked to the type of the donor but contribute less otherwise. Low types, on the other hand, contributes more than high types when group members are aware of the heterogeneity but contributions cannot be linked to types. Our results underline the importance of the information structure when persons with different abilities contribute to a joint project, as in the context of teamwork or charitable giving.Public Goods, Voluntary contribution mechanism, Heterogeneity, Information, Norms

Heterogeneous Productivity in Voluntary Public Good Provision: An Experimental Analysis

This article experimentally examines voluntary contributions when group members' marginal returns to the public good vary. The experiment implements two marginal return types, low and high, and uses the information that members have about the heterogeneity to identify the applied contribution norm. If agents are aware of the heterogeneity, contributions increase in general. However, high types contribute more than low types when contributions can be linked to the type of the donor but contribute less otherwise. Low types, on the other hand, contribute more than high types when group members are aware of the heterogeneity but contributions cannot be linked to types. Our results underline the importance of the information structure when persons with different abilities contribute to a joint project, as in the context of teamwork or charitable giving.public goods, voluntary contribution mechanism, heterogeneity, information, norms

Effect of fentanyl for preterm infants on mechanical ventilation: a systematic review and meta-analysis

Introduction: Because excessive physical stress is harmful, reducing pain and discomfort in premature neonates during mechanical ventilation is a major challenge for physicians. There are no consensus and systematic review on the use of fentanyl, the most commonly used pain reliever in preterm neonates during mechanical ventilation. We aim to compare the benefits and harms of fentanyl versus placebo or no drug for preterm neonates receiving mechanical ventilation. Methods: A systematic review of randomized controlled trials (RCTs) was conducted according to the Cochrane Handbook for Systematic Reviews of Interventions. The systematic review was reported using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses statement. Scientific databases such as MEDLINE, Embase, CENTRAL, and CINAHL were searched. All preterm infants on mechanical ventilation and enrolled in an RCT of fentanyl versus control were included. Results: Of 256 reports initially retrieved, 4 reports met the eligibility criteria. Fentanyl was not associated with mortality risk compared to the control (risk ratio: 0.72, 95% confidence intervals [CIs]: 0.36–1.44). No increase in ventilation duration (mean difference [MD]: 0.04, 95% CIs: −0.63–0.71) and no effect on hospital stay length (MD: 4.00, 95% CIs: −7.12–15.12) were found. Fentanyl intervention does not affect any other morbidities, including bronchopulmonary dysplasia, periventricular leukomalacia, patent ductus arteriosus, intraventricular hemorrhage (IVH), severe IVH, sepsis, and necrotizing enterocolitis. Conclusion: The present systematic review and meta-analysis failed to demonstrate the benefit of administering fentanyl to preterm infants on mechanical ventilation in mortality and morbidities. Follow-up studies are required to investigate the long-term neurodevelopment of the children

Produção de pigmentos extracelulares por espécies de Fusarium e Aspergillus

The search for substitutes of synthetic dyes has been gaining increasing attention, due to their carcinogenic and allergenic potential. In that sense, the primary focus has been to find sustainable sources, which generate minimal environmental impact during the dyeing process. We aimed to perform a screening on filamentous fungi from genera Fusarium and Aspergillus for biodye extraction. Five species from these genera were fermented in glucose-salts broth and semi-solid potato substrate. Each species was tested in pH 4.6 and 5.6 and incubated under stationary conditions at 20 and 27 °C for 4–6 weeks. The biodye was extracted, concentrated in a rotary evaporator and lyophilized for isolation of its powdered form. Aspergillus parasiticus and A. flavus respectively produced orange and yellow pigments in liquid medium, while Fusarium graminearum produced red pigments in semi-solid substrate. We concluded that the studied fungi are effective biodye producers.Atualmente, a busca para substituir os corantes sintéticos, devido ao seu potencial carcinogênico e aparecimento de reações alérgicas, por fontes sustentáveis, que gerem impactos mínimos ao meio ambiente durante o processo de coloração vêm ganhando destaque. Assim, os objetivos do presente estudo foi realizar uma triagem com fungos filamentosos dos gêneros Fusarium spp. e Aspergillus spp. para extração de biocorante. Um total de cinco espécies pertencentes ao gênero Fusarium e Aspergillus foram fermentados em soluções líquidas de sais-glicose e formulações semissólidas de batata. Cada espécie foi testada em pH 4,6 e 5,6 e incubados sob condições estacionárias a temperatura de 20 e 27°C por 4-6 semanas. O biocorante foi extraído, concentrado em rotaevaporador e liofilizado para sua obtenção em forma de pó. Aspergillus parasiticus e Aspergillus flavus produziram pigmentos alaranjados e amarelos, respectivamente no meio líquido. Fusarium graminearum produziu pigmentos vermelhos em formulação semissólida. Com base nesses resultados foi possível observar que os fungos citados são eficientes produtores de biocorantes

Acetic Acid Treatment Enhances Drought Avoidance in Cassava (Manihot esculenta Crantz)

The external application of acetic acid has recently been reported to enhance survival of drought in plants such as Arabidopsis, rapeseed, maize, rice, and wheat, but the effects of acetic acid application on increased drought tolerance in woody plants such as a tropical crop “cassava” remain elusive. A molecular understanding of acetic acid-induced drought avoidance in cassava will contribute to the development of technology that can be used to enhance drought tolerance, without resorting to transgenic technology or advancements in cassava cultivation. In the present study, morphological, physiological, and molecular responses to drought were analyzed in cassava after treatment with acetic acid. Results indicated that the acetic acid-treated cassava plants had a higher level of drought avoidance than water-treated, control plants. Specifically, higher leaf relative water content, and chlorophyll and carotenoid levels were observed as soils dried out during the drought treatment. Leaf temperatures in acetic acid-treated cassava plants were higher relative to leaves on plants pretreated with water and an increase of ABA content was observed in leaves of acetic acid-treated plants, suggesting that stomatal conductance and the transpiration rate in leaves of acetic acid-treated plants decreased to maintain relative water contents and to avoid drought. Transcriptome analysis revealed that acetic acid treatment increased the expression of ABA signaling-related genes, such as OPEN STOMATA 1 (OST1) and protein phosphatase 2C; as well as the drought response and tolerance-related genes, such as the outer membrane tryptophan-rich sensory protein (TSPO), and the heat shock proteins. Collectively, the external application of acetic acid enhances drought avoidance in cassava through the upregulation of ABA signaling pathway genes and several stress responses- and tolerance-related genes. These data support the idea that adjustments of the acetic acid application to plants is useful to enhance drought tolerance, to minimize the growth inhibition in the agricultural field

DNA methylation clock DNAmFitAge shows regular exercise is associated with slower aging and systemic adaptation

DNAmPhenoAge, DNAmGrimAge, and the newly developed DNAmFitAge are DNA methylation (DNAm)-based biomarkers that reflect the individual aging process. Here, we examine the relationship between physical fitness and DNAm-based biomarkers in adults aged 33–88 with a wide range of physical fitness (including athletes with long-term training history). Higher levels of VO 2 max ( ρ = 0.2, p = 6.4E − 4, r = 0.19, p = 1.2E − 3), Jumpmax ( p = 0.11, p = 5.5E − 2, r = 0.13, p = 2.8E − 2), Gripmax ( ρ = 0.17, p = 3.5E − 3, r = 0.16, p = 5.6E − 3), and HDL levels ( ρ = 0.18, p = 1.95E − 3, r = 0.19, p = 1.1E − 3) are associated with better verbal short-term memory. In addition, verbal short-term memory is associated with decelerated aging assessed with the new DNAm biomarker FitAgeAcceleration ( ρ : − 0.18, p = 0.0017). DNAmFitAge can distinguish high-fitness individuals from low/medium-fitness individuals better than existing DNAm biomarkers and estimates a younger biological age in the high-fit males and females (1.5 and 2.0 years younger, respectively). Our research shows that regular physical exercise contributes to observable physiological and methylation differences which are beneficial to the aging process. DNAmFitAge has now emerged as a new biological marker of quality of life