Home About us Contact
|
Home About us Contact | ||
|
|
||
Potential Negative Effects (potential + negative_effects)
Selected AbstractsEnhancing mothers' interactions with toddlers who have sensory-processing disordersINFANT MENTAL HEALTH JOURNAL, Issue 3 2010Nurit Jaegermann The objective of the current study was to examine the effects of a brief Mediational Intervention for Sensitizing Caregivers (the MISC-SP) designed to enhance the quality of mothers' interaction with their toddlers who have sensory processing disorders (SPD). The basic assumption was that quality parent,child interactions can serve as a protective factor moderating the potential negative effects of toddlers' sensory processing and regulation difficulties on their development. The effects of the intervention were compared to those of another intervention designed to enhance children's sensory functioning (the SI group) and to a control group receiving no intervention. Participants were 86 toddlers (12,18 months old) with SPD and their mothers, who were randomly assigned to the aforementioned three research groups. Following the intervention period, mothers in the MISC-SP group showed more sensitive behavior, supported their toddlers' communication behavior better, and used teaching behaviors more appropriately than did mothers in the two other groups. [source] Symptoms of attention-deficit/hyperactivity disorder in first-time expectant women: Relations with parenting cognitions and behaviorsINFANT MENTAL HEALTH JOURNAL, Issue 1 2007Jerilyn E. Ninowski The relationship between maternal symptoms of attention-deficit/hyperactivity disorder (ADHD) and parenting cognitions and behaviors was studied in 86 first-time expectant women. Women high on ADHD symptoms were less likely to be married, less likely to have obtained at least some university education, and less likely to report that they wanted to get pregnant at the time they became pregnant. As predicted, ADHD symptoms were positively correlated with symptoms of anxiety and depression, and predicted less positive prenatal expectations regarding the infant and the future maternal role and lower maternal self-efficacy. Contrary to predictions, ADHD did not predict any incremental variance in maternal stressful life events or social support. Symptoms of ADHD were negatively correlated with attendance at recommended prenatal checkups, but were unrelated to other behaviors during pregnancy. Findings suggest that even prior to any contact with their infant, women with ADHD symptoms have maladaptive cognitions regarding their expectations of motherhood and parenting abilities. As a result, they may benefit from early interventions that focus on attenuating the potential negative effects that these maladaptive cognitions might have on the mother-infant relationship and later developmental outcomes for their children. [source] Effects of ultraviolet-B radiation and pH on early development of the moor frog Rana arvalisJOURNAL OF APPLIED ECOLOGY, Issue 3 2001Maarit Pahkala Summary 1,Although the potential negative effects of increased ultraviolet-B (UV-B) radiation on early life stages of aquatic organisms are widely recognized, possible synergistic effects with other stressors have seldom been studied outside the laboratory. We investigated the effects of UV-B radiation and pH on hatchability and early development of moor frog Rana arvalis eggs in the field and in laboratory experiments conducted during April 1998 and April 2000 in central Sweden. 2,In the field experiments, no evidence was found for reduced hatchability or increased frequency of developmental anomalies of embryos exposed to ambient levels of UV-B compared with embryos shielded from UV-B radiation. 3,Hatchlings shielded from ambient UV-B radiation did not grow larger than their exposed full-sibs, giving no support to the hypotheses that (i) the repair of cellular UV-B damage might be energetically costly nor (ii) that UV-B-induced photoproducts directly reduce growth. 4,Although low pH (5·0) reduced hatchability, increased frequency of developmental anomalies and reduced early embryonic growth in R. arvalis, there was no evidence for synergistic effects of pH and UV-B on any of these traits. 5,The lack of UV-B radiation effects on the development of R. arvalis embryos cannot be ascribed to relatively low effective daily doses of radiation (c. 0·43 kJ m,2) during the field experiments, as in the laboratory even higher doses at UV-B 1·25 kJ m,2 and 1·58 kJ m,2 (all DNA weighed) had no negative effects. 6,These results suggest that current levels of UV-B radiation in northern Europe are not likely to reduce fitness in natural populations of the moor frog, even in areas already stressed by acidity. [source] Effects of Artificial Substrate and Stocking Density on the Nursery Production of Pacific White Shrimp Litopenaeus vannameiJOURNAL OF THE WORLD AQUACULTURE SOCIETY, Issue 4 2004Komarey R. K. Moss Nursery production may be enhanced by the addition of artificial substrate to increase the surface area upon which shrimp graze and to serve as refuge. The objective of this study was to assess the effects of the artificial substrate, AquaMatsTM, on the performance of postlarval Pacific white shrimp Litopenaeus vannamei stocked at three densities. Eighteen 230-L tanks were stocked with 10-d postlarvae (mean weight < 0.01 g). Six treatments were evaluated and consisted of shrimp stocked at three densities (778 shrimp/m2, 1,167 shrimp/ m2, and 1,556 shrimp/m2) with and without access to artificial substrate. Shrimp in all treatments received a commercial diet ad libitum. After 6 wk, shrimp were harvested from each nursery tank, counted, and batch weighed. Mean final weight, survival, production, feed conversion ratio, and water quality parameters were analyzed by 2-way ANOVA. There were highly significant (P < 0.001) density and substrate effects on final weight, but there was no significant interaction effect. Final weight was 26.0, 17.4, and 34.5% greater in treatments with substrate than without substrate when stocked at 778, 1,167, and 1,556 shrimp/m2, respectively. There was no significant density, substrate, or interaction effect on survival or water quality. Mean survival was ± 89.1% for all treatments. Increased shrimp growth in the presence of added substrate was likely due to the availability of attached particulate organic matter on the AquaMatsTM that served as an additional food source. Results from this study indicate that artificial substrate can be used to mitigate the potential negative effects of high stocking density on growth of L. vannamei in nursery systems. [source] Indirect facilitation and competition in tree species colonization of sub-Mediterranean grasslandsJOURNAL OF VEGETATION SCIENCE, Issue 3 2006Georges Kunstler Abstract: Questions: In the absence of herbivores, what is the importance of shrub facilitation for the colonization of grasslands by Fagus sylvatica and Quercus pubescens? Is there an indirect facilitative effect of shrubs on tree seedlings by limiting herb competition? Location: Causse du Larzac, southern Massif Central, France. Methods: We conducted field experiments on the facilitative role of shrubs in seedling emergence and survival, in relation to potential negative effects of shading and the presence of herbs. The effects of shade and herbs on allocation and root morphology were analysed in a pot experiment. Results: According to these experiments, the establishment of both tree species was facilitated by shrubs, but the two species differed in the processes underlying this facilitation. Shade directly facilitates the emergence rate of both species. Shade also indirectly facilitates Fagus survival by limiting herb competition. No indirect facilitation of Quercus survival was detected. These differences reflect variation in the tolerance of herb competition by seedlings of the two species. The tolerance of herb competition by Quercus seedlings allows regeneration over a wide area under each shrub and some regeneration events in grasslands at low grazing intensity. In contrast, for Fagus, only a narrow area under each shrub is suitable; regeneration is zero in grassland. The high tolerance of herb competition by Quercus seedlings may result from the avoidance of root competition. Conclusions In grasslands with severe drought stress, and almost obligatory shrub facilitation for tree seedling regeneration, the tolerance of herb competition may alter the precise role of facilitation in the colonization process. [source] Demographic Change and Economic Growth in AsiaASIAN ECONOMIC POLICY REVIEW, Issue 1 2009David E. BLOOM J11; O11 Abstract Trade openness, high savings rates, human capital accumulation, and macroeconomic policy only accounted for part of the 1965,1990 growth performance in East Asia. Subsequently, demographic change was shown to be a missing factor in explaining the East Asian growth premium. Since 1990, East Asia has undertaken major economic reforms in response to financial crises and other factors. We reexamine the role of the demographic transition in contributing to cross-country differences in economic growth through to 2005, with a particular focus on East Asia. We highlight the need for policy to offset potential negative effects of aging populations in the future. [source] | ||||||||||