The development of the head direction system before eye opening in the rat.

Head direction (HD) cells are neurons found in the hippocampal formation and connected areas that fire as a function of an animal's directional orientation relative to its environment. They integrate self-motion and environmental sensory information to update directional heading. Visual landmarks, in particular, exert strong control over the preferred direction of HD cell firing. The HD signal has previously been shown to appear adult-like as early as postnatal day 16 (P16) in the rat pup, just after eye opening and coinciding with the first spontaneous exploration of its environment. In order to determine whether the HD circuit can begin its organization prior to the onset of patterned vision, we recorded from the anterodorsal thalamic nucleus (ADN) and its postsynaptic target in the hippocampal formation, the dorsal pre-subiculum (PrSd), before and after eye opening in pre-weanling rats. We find that HD cells can be recorded at the earliest age sampled (P12), several days before eye opening. However, this early HD signal displays low directional information content and lacks stability both within and across trials. Following eye opening, the HD system matures rapidly, as more cells exhibit directional firing, and the quality and reliability of the directional signal improves dramatically. Cue-rotation experiments show that a prominent visual landmark is able to control HD responses within 24 hr of eye opening. Together, the results suggest that the directional network can be organized independently of visual spatial information while demonstrating the importance of patterned vision for accurate and reliable orientation in space

Developments in electrochemical processes for recycling lead-acid batteries

The lead-acid battery recycling industry is very well established, but the conventional pyrometallurgical processes are far from environmentally benign. Hence, recent developments of lead-acid battery recycling technologies have focused on low-temperature (electro-)hydrometallurgical processes, the subject of this review, covering modified electrolytes, improved reaction engineering, better reactor design and control of operating conditions

Do grandparents matter? Intergenerational relationships between the closest grandparents and Malaysian adolescents

A close connection with a grandparent can interact with an adolescent’s experience of life stressors to increase or decrease their risk for negative outcomes. Traditional filial values may be linked to closer grandparent–grandchildren interactions in Asian cultures, such as Malaysia. This study examined how grandparental involvement and emotional closeness moderated the associations between life stressors and adjustment difficulties among adolescents in Malaysia (n = 643 adolescents). Hierarchical regression analysis showed that greater proximal and distal life stressors were associated with more adjustment difficulties of adolescents. Moreover, emotional closeness with the closest grandparents moderated the association between adolescent distal adversities and adjustment difficulties. Specifically, the contribution of accumulative stress from adverse life events on the risk of adjustment difficulties among adolescents may be alleviated when adolescents perceived high levels of emotional ties with the closest grandparents. These findings suggest that grandparents can directly relate to grandchildren’s adjustment through engaging emotional relationships. Our study shed lights on the interpretation of the contribution of grandparents to adolescent outcomes and the development of adolescents’ resilience in the face of adversity within the Malaysian cultural context

The usage of sexual internet media and sexual behaviour among sexually experienced adolescents in Malaysia: Sexual intention as a mediator

© 2018 Universiti Putra Malaysia Press. This study examines the relationships between the use of sexually explicit material, sexual intention, and sexual behaviour in a sample of 189 sexually experienced adolescents (aged 16-17) in Malaysia. Additionally, this study investigates the mediating role of sexual intention on the relationship between the use of Sexual Explicit Internet Media (SEIM) and sexual behaviour. A self-administered questionnaire focusing on the use of SEIM scale, Youth Pre-coital and Sexual Intentions Scale, and Sexual Behaviour Assessment measured adolescents' use of SEIM, sexual intention, and sexual behaviour. The results demonstrate that the use of SEIM positively correlates with adolescents' sexual intention and sexual behaviour. Increasing engagements in sexually-related behaviour reveal an increase in sexual intentions. Findings also denote that higher exposure to SEIM promotes sexual intention, which in turn increases engagement in sexually-related behaviour. In the attempt to control sexual arousal among adolescents, prevention and intervention programmes which deal with sexuality should consider the role of Internet media and the development of healthy cognitive processes

Synergetic enhancement of organic solar cell thermal stability by wire bar coating and light processing

OPV film deposition by wire-bar coating and light soaking result in polymer:fullerene solar cells with synergetically enhanced thermal stability.</p

Foster youth and drug use: Exploring risk and protective factors

Substance use and misuse experiences of foster youth remain an under-researched area. Given that early use of drugs is said to be a common factor among 90% of those who develop substance misuse problems in their lifetime, this is an important area of academic study (. Dennis, White, & Ives, 2009). By drawing upon primary empirical data from a mixed-methods study, this paper addresses an important gap in the literature and seeks to provide an improved understanding of foster youth, drug use and vulnerability. A total of 261 foster youth, who had exited care, contributed to a quantitative survey, and a further 35 provided qualitative narratives of their lived experience. Key risk factors including experience of homelessness, school exclusion and living setting are identified as strong influences that predict high levels of drug use among foster youth. Targeted social support and interventions in the form of pre-leaving care in the context of a strong practitioner/youth relationship are suggested to help ameliorate poor outcomes to obviate the problem of substance misuse among foster youth

Asian “Guan” Parenting and Life Satisfaction Among Adolescents in Malaysia: The Mediating Role of Filial Piety

Literature on adolescent development has shown that parenting practices have positive relationships with adolescents’ life satisfaction. Adolescents’ life satisfaction improves when they have parents low in psychological control who uphold reciprocal self-disclosure in their communication. Guan parenting was found to correlate positively with adolescents’ development. Therefore, it is methodologically important to replicate the investigation on the relationship between adolescents’ life satisfaction and Guan parenting. Literature suggests that filial piety is shaped by parenting practices and adolescents who perceived intense parental concern, care, and involvement tend to uphold filial piety and express gratitude toward parents which may promote the adolescents’ life satisfaction. In this study, mediation analysis was done to elucidate the relationship among parents’ guan parenting style, filial piety, and life satisfaction on 606 adolescents (Mage=15.07; SDage=1.03; 52.1% females) in Malaysia. The adolescents were sampled through cluster sampling, and data were collected using self-administered questionnaires. The results showed positive relationship between paternal and maternal guan parenting with filial piety and adolescents’ life satisfaction. Greater parents’ filial piety was linked to higher life satisfaction among adolescents. Findings from the mediation models indicated the association among guan parenting with filial piety, gratitude toward parents, and higher life satisfaction. The findings also offered empirical evidence to the underlying mechanism of how guan parenting could affect adolescent life satisfaction via the mediating role of filial piety. The findings also supported the importance of culture-infused parenting in inculcating adolescents’ filial piety besides establishing its link to life satisfaction in Asian families

The removal of thermally aged films of triacylglycerides by surfactant solutions

Thermal ageing of triacylglycerides (TAG) at high temperatures produces films which resist removal using aqueous surfactant solutions. We used a mass loss method to investigate the removal of thermally aged TAG films from hard surfaces using aqueous solutions of surfactants of different charge types. It was found that cationic surfactants are most effective at high pH, whereas anionics are most effective at low pH and a non-ionic surfactant is most effective at intermediate pH. We showed that the TAG film removal process occurs in several stages. In the first ‘‘lag phase’’ no TAG removal occurs; the surfactant first partitions into the thermally aged film. In the second stage, the TAG film containing surfactant was removed by solubilisation into micelles in the aqueous solution. The effects of pH and surfactant charge on the TAG removal process correlate with the effects of these variables on the extent of surfactant partitioning to the TAG film and on the maximum extent of TAG solubilisation within the micelles. Additionally, we showed how the TAG removal is enhanced by the addition of amphiphilic additives such as alcohols which act as co-surfactants. The study demonstrates that aqueous surfactant solutions provide a viable and more benign alternative to current methods for the removal of thermally aged TAG films

Psychometric Properties of the Training Parenting Style Scale in a Malaysian Sample of Adolescents: Factor Analysis, Internal Consistency, and Measurement Invariance

The importance of parenting styles on children’s outcomes, including cognitive, social, academic, and values makes this topic a central concern to social researchers and psychologists. However, past research has reported controversial evidence on the relationship between authoritarian parenting and children’s outcomes in non-Western cultural contexts. This raises awareness on the implication of cultural differences in parenting styles. As a result, the training parenting style scale (TPSS) was proposed based on the Confucian concept of ‘Guan’ and ‘Chiao Shu.’ This scale is allegedly more reflective of the Asian parenting style. The present study examined the psychometric properties and measurement invariance of the Malay version of the TPSS across adolescents’ perceived maternal and paternal training and by adolescent gender. Of the 8 items in the original TPSS, confirmatory factor analysis supported 6-item scale with error correlations was the best-fitting model. Internal consistency was also good for the 6-item scale. Furthermore, support for configural, metric, scalar, residual, and structural invariance emerged across adolescents’ perceived maternal and paternal training and across adolescent gender. Results of this study supported the psychometric properties of the 6-item TPSS after taking into account several cautiously considered limitations