Search results for "juvenile"
showing 10 items of 366 documents
Characterization of a putative extracellular matrix protein from the beetle Tenebrio molitor: hormonal regulation during metamorphosis.
2004
0949-944X (Print) Journal Article Research Support, Non-U.S. Gov't; We used differential display to isolate epidermis cDNAs corresponding to juvenile-hormone analog-regulated mRNA from the beetle Tenebrio molitor. One of them encodes a putative extracellular matrix (ECM) protein, named Tenebrin. Indeed, the deduced protein sequence contains ECM typical features like the presence of a signal peptide, internal repeats, a RGD tripeptide sequence motif known to bind integrins and von Willebrand factor type c domains involved in protein-protein interactions. Northern blot analysis reveals a single transcript of about 11 kb with an expression pattern correlated to 20-hydroxyecdysone fluctuations …
Characterization of a cDNA clone encoding a glycine-rich cuticular protein of Tenebrio molitor: developmental expression and effect of a juvenile hor…
1992
0962-1075 (Print) Journal Article; The complete sequence of a cDNA clone, isolated from epidermal mRNA of Tenebrio molitor using a monoclonal antibody raised against an adult-specific cuticular antigen only present in the hard cuticle, was obtained after primer extension at the 5' end. From this cDNA sequence, the deduced protein encompasses 199 amino acids (including a signal peptide) with a total molecular weight of 20.7 kDa. The protein exhibits a bipartite structure: glycine-rich region located in its NH2-terminal part and a carboxy-terminal domain sharing homologies with other cuticular proteins of Orthoptera, Diptera and Lepidoptera. In-situ hybridization analysis shows that the corre…
Effect of epidermal papillomatosis on survival of the freshwater fish Rutilus rutilus.
2004
Epidermal papillomatosis occurs in several marine and freshwater fish species. Previously, papillomatosis has been shown to induce mortality in juvenile carp. We studied the effect of epidermal papillomatosis on the survival of adult male roach Rutilus rutilus by caging naturally diseased, marked (by us) fish in the field. Within the constraints of the experimental design, there was no difference in survival between healthy, slightly diseased and heavily diseased fish. Therefore, we conclude that the possible effect of epidermal papillomatosis on the mortality of wild roach is relatively minor.
Unusual change in activity pattern at cool temperature in a reptile (Sphenodon punctatus).
2014
Abstract Animals that can be active both during day and night offer unique opportunities to identify factors that influence activity pattern. By experimental manipulations of temperatures under constant photoperiod, we aimed to determine if emergence, activity and thermoregulatory behaviour of juvenile tuatara ( Sphenodon punctatus ) varied at different temperatures (20 °C, 12 °C and 5 °C). To help clarify its activity pattern, we compared tuatara with two lizard species endemic of the South Island of New Zealand for which activity pattern is known and clearly defined: the nocturnal common gecko Woodworthia “Otago/Southland” and the diurnal McCann׳s skink Oligosoma maccanni . Tuatara showed…
Examining the predictors of prosocial behavior in young offenders and nonoffenders
2021
Research on young offenders has primarily focused on identifying predictors of the maladaptive, aggressive behavior; there is a scarcity of evidence on factors that relate to prosocial behavior in these adolescents. The current study examined the link from parenting, emotional instability, and prosocial reasoning to prosocial behavior, while also examining the mediating roles of empathic concern (EC) and perspective taking (PT) in a sample of Spanish adolescent offenders compared to a sample of nonoffenders. Participants were 440 adolescents: 220 young offenders residing in four Youth Detention Centres of Valencia (67.3% men) and 220 enrolled in public and private schools within the metrop…
Characteristics of young offenders depending on the type of crime
2015
The aim of this study is to define a profile of juvenile offenders depending on the type of crime (against property or against persons), according to several socio-demographic variables, and a number of indicators of juvenile risk. Participants were 395 adolescents between the ages of 14 and 18 with a criminal record in the juvenile court over a two-year follow-up period. Results showed that in property-related offences the offender is more likely to be male, from an Eastern European country, and with inconsistent parenting. On the other hand, crimes against persons would be committed mostly by girls, Latin American or African juveniles, and with individual factors such as aggressive behavi…
Constructive Leisure as a Strategy For Adolescents Integration in Conflict with the Law
2014
Las actividades de ocio deben representar por sí mismas, acciones educativas con capacidad de conquistar el espacio cotidiano de los nuevos tiempos. Además, se establecen como actividades constructivas en el tránsito hacia la madurez capaces de enlazar prácticas educativas con lúdicas. Cuando se producen fracturas entre estas dos dimensiones (aprendizaje y diversión), pueden generarse espacios sobre los que las actividades orientadas al recreo constituyan en si mismas un riesgo asociado a las propias dinámicas adolescentes. La alerta surge si estos períodos acaban por esconder otras actividades desviadas que, representadas en el espacio cotidiano, transformen rutinas lúdicas en habituales p…
EVIDENCE FOR KIN-STRUCTURED GROUP FOUNDING AND LIMITED JUVENILE DISPERSAL IN THE SUB-SOCIAL SPIDER STEGODYPHUS LINEATUS (ARANEAE, ERESIDAE)
2001
Abstract In sub-social spiders, restricted dispersal of young (i.e., natal philopatry) and the potential for inbreeding could contribute to within-population subdivision, thus resulting in a population structure similar to that found in social congeners. In this context, we analyzed the origin and mode of individual distribution patterns and their contribution to within-population structure in juveniles of the sub-social spider Stegodyphus lineatus. We investigated the distribution of juveniles for four months after leaving the maternal nest using allozyme genetic markers. We found that isolated groups of juveniles consisted predominantly of siblings, whereas larger aggregations of individu…
Detection of the Spider Predator, Hololena Nedra By Naïve Juvenile Field Crickets (Gryllus Integer) Using Indirect Cues
2004
Summary In many species, prey detect predators using chemical cues, which may be based on the predator’s previous diet. Furthermore, the predator’s previous hunting strategy and diet may affect the prey’s behavioural strategies to avoid predation. Juvenile Gryllid field crickets face predation by spiders, but the responses of juvenile crickets to spiders are unknown. We studied whether naive juvenile field crickets can detect a predatory spider, Hololena nedra, using chemotactile cues (silk, secretions and excreta). We also studied the effect of the predator’s diet on the juvenile field cricket’s anti-predator behaviour. Cricket nymphs avoided the chemotactile spider cues when the spiders w…
Effects of progressive decrease of feeding frequency and re-feeding on production parameters, stomach capacity and muscle nutritional value in rainbo…
2020
Abstract Feeds and feeding constitute the major part of costs in intensive aquaculture. Any action to reduce feeding costs without negatively affecting fish production parameters and flesh quality would improve profitability of farming. Therefore, we studied the effects of feeding frequency on production parameters, stomach capacity and nutritional value of muscle in juvenile rainbow trout (Oncorhynchus mykiss) in an experiment with two stages. First, during the nine-week “starvation period” we fed rainbow trout (initial weight c. 40 g) with four different feeding protocols in an attempt to adapt the fish to a progressive decrease in the number of feeding days. During the second stage, a fo…