Search results for "developmental stage"
showing 10 items of 33 documents
Formal operations and postformal reasoning: A replication
1991
The relationship between formal operations and postformal reasoning was examined by using the Shayer (1978) chemicals problem to assess formal operations and the Commons, et al. (1982) four-story problem to measure postformal reasoning. The subjects were 35 undergraduate social science and humanities students. None of the subjects who were classified as concrete operational or transitional on the chemicals task showed postformal reasoning. The hypothesis that full format operations are a necessary condition of post-formal reasoning and the expectation that subjects showing full formal operations are more likely than others to exhibit postformal reasoning was not supported.
Biology of the preimaginal stages in trogid beetles (Coleoptera): Experimental data∗
1992
Abstract Some aspects of larval behaviour in two species of trogid beetles, Trox bispidus (Pontoppidan) from temperate Europe and Afromorgus tuberosus (Klug) from tropical Africa, have been studied experimentally. From the results obtained it emerges that the rise of the newborn larvae towards the soil surface is imputable to a simple negative geotropism. Larval food relocation also contributes to reducing aggressive interactions at the food source. The potential range of trophic and behavioural variation seems to be larger than that expressed in nature as a rule. This can contribute to explaining, in evolutive terms, the rare cases of transgression from a uniform trophic and behavioural pa…
Sensory & consumer studies with special populations: children and elderly
2015
revue créée en 2015; The need to adapt the usual sensory methods to face the particularities of children and elderly has been emphasized since many years. A diversity of methods that could be used with children according to their developmental stage, and to a lesser extent with elderly depending on their cognitive status, have been described. This review aims at underlining limits but also possibilities for measuring, in children and elderly, sensory reactions, food acceptance and also for exploring cognitive aspects of food perception. The main points to conduct successfully sensory and consumer studies with these populations are highlighted.
Morphological abnormalities induced by Fenoxycarb on the pupa ofPhanerotoma (Phanerotoma) ocularisKohl (Hym., Braconidae)
1993
Fenoxycarb at concentrations of 0.001 μg/ml, 0.005 μg/ml, 0.01 μg/ml, 0.05μg/ml and 0.1 μg/ml had an adverse effect on the pupa of Phanerotoma (Phanerotoma) ocularis. When topically applied, it induced morphological abnormalities. The percentage of anomalous obtained depended of developmental pupal stage and was higher when was applied in the first moment of development (80 %-90 %) than in the final of development (50%-60%). These anomalous was inviables. Zusammenfassung Morphologische Abnormitaten bei Puppen von Phanerotoma (Phanerotoma) ocularis Kohl (Hym., Braconidae) nach Einwirkung von Fenoxycarb Fenoxycarb, in Konzentrationen von 0.001 μg/ml, 0.0005 μg/ml, 0.01 μg/ml, 0.05 |μg/ml und …
Polypeptide Markers Differentiating Juvenile and Adult Tissues in Chestnut
1993
Differences were observed between the polypeptide contents of in vitro shoot cultures derived from upper branches (adult material) and basal shoots (juvenile material) of the same chestnut tree. Cultures derived from mature crown growth yielded two polypeptide bands that were not afforded by cultures derived from juvenile basal shoots. Since all cultures were derived from the same tree the polypeptide differences appear to reflect the ontogenetic age of the starting material.
Relationship between the Stages of Development of Fusarium moniliforme ATCC 38932 and Production of Fusarin C
2019
A study of the kinetics of fusarin C production by Fusarium moniliforme ATCC 38932, a known producer of fusarin C, was carried out. This strain was subcultured on an EG medium for an adequate sporulation, and a 4% inoculum was transferred to the 10% ICI N medium. The conditions for the production of fusarin C in this synthetic culture medium were optimized. The time-course study of fusarin C performed over 26 days with this strain showed three different developmental stages in which a maximum production of fusarin C was reached on the 8th day of incubation; thereafter this strain ceased growing exponentially and exhibited a sharp decrease of fusarin C from that moment on.
3H-uridine labelling patterns and chromosomal polymorphism inDrosophila subobscura: J and U chromosomes
1984
The3H-uridine labelling patterns in J and U polytene chromosomes ofDrosophila subobscura were determined. The analysis was carried out in two developmental stages and in two strains proceeding from the same geographical origin whose genotypes were: Jst/Jst; U1+2/U1+2 and J1/J1; U1+2+8/U1+2+8 respectively. It was observed that the labelling pattern coincided very approximately with the puffing pattern in the same stages and chromosomal arrangements. Comparison of the3H-Uridine incorporation patterns between chromosomal arrangements showed light quantitative differences. These results are discussed in relation to the inversion effect.
Die Embryologie im Spannungsfeld zwischen Tradition und Empirie.
1991
Already in classical antiquity people dealt with the principle of formation, developing different theories. Researchers in the renaissance, working in the conflict zone between tradition and experience, tried to prove one or the other of these theories by the means of new observations, especially of chicken development. Aldrovandi was the first to see the real principle of formation of the hen's egg, i. e. the blastodisc, but he didn't recognize the importance of his discovery due to his close adherence to Aristotle in the theoretical field. Fabricius even thought that traditional knowledge was of more importance than his own excellent observations. Parisano was the first to succeed in maki…
Growth and survival of European whitefish larvae under enhanced UV-B irradiance
2004
Two laboratory rearing experiments with newly hatched European whitefish Coregonus lavaretus larvae were performed to study the effects of UV-B (280–315 nm) radiation on their survival and growth. The results indicate that under normal circumstances in Finnish lakes, enhanced UV irradiance will not be a threat to the survival of newly hatched European whitefish larvae.
How Are Practice and Performance Related? Development of Reading From Age 5 to 15
2021
Does reading a lot lead to better reading skills, or does reading a lot follow from high initial reading skills? The authors present a longitudinal study of how much children choose to read and how well they decode and comprehend texts. This is the first study to examine the codevelopment of print exposure with both fluency and comprehension throughout childhood using autocorrelations. Print exposure was operationalized as children’s amount of independent reading for pleasure. Two hundred children were followed from age 5 to age 15. Print exposure was assessed at ages 5, 7, 8, 9, and 13. Prereading skills were tested at age 5 and reading skills at ages 7, 8, 9, 14, and 15 (the latter with t…