908 resultados para Plants--Effects of acids on.
Resumo:
This study examined origins of possible selves and the role of Epiphanies. Specifically, of interest was whether there are demographic or self-regulatory differences in possible selves derived from different origins. The sample consisted of 411 participants, with age ranging from 17–95. The data was taken from two previous research studies on possible selves. The first research question examined the origins of possible selves. Results indicate that possible selves are derived from Epiphany experiences along with internal and external influences, such as another person, or a particular event. The second research question determined whether there were any demographic, ethnic, or cultural differences in the origins of possible selves. Results showed age, cohort, and socioeconomic status had effects. The final research question addressed whether there were differences in the domains of possible selves derived from various origins. Results indicated differences in domains however there were no clear patterns. The first hypothesis was that possible selves derived from an Epiphany would be considered more important than those derived from other origins. This hypothesis was not supported. The second hypothesis was that hoped-for possible selves were more likely to be derived from an Epiphany experience than feared selves. This hypothesis was supported. The second hypothesis also stated that possible selves derived from an Epiphany were more likely to be balanced than selves derived from other origins and this was supported for feared selves only. Finally, the third hypothesis stated that there would be self-regulatory differences between selves derived from Epiphanies compared to other origins but this was not supported. Taken together these findings show that the origins of possible selves are important and especially those derived from epiphany. The role of an Epiphany on the formation and implementation of possible selves paves the way for important prevention programs aimed at promoting healthy development and promoting an individual’s well being.
Resumo:
The purpose of this study was to identify the effects of active dehydration on balance in euthermic individuals employing the Balance Error Scoring System (BESS). The results indicate that dehydration significantly negatively affects balance.
Resumo:
The effects of shade on benthic calcareous periphyton were tested in a short-hydroperiod oligotrophic subtropical wetland (freshwater Everglades). The experiment was a split-plot design set in three sites with similar environmental characteristics. At each site, eight randomly selected 1-m2 areas were isolated individually in a shade house, which did not spectrally change the incident irradiance but reduced it quantitatively by 0, 30, 50, 60, 70, 80, 90 and 98%. Periphyton mat was sampled monthly under each shade house for a 5 month period while the wetland was flooded. Periphyton was analyzed for thickness, DW, AFDW, chlorophyll a (chl a) and incubated in light and dark BOD bottles at five different irradiances to assess its photosynthesis–irradiance (PI) curve and respiration. The PI curves parameters P max, I k and eventually the photoinhibition slope (β) were determined following non-linear regression analyses. Taxonomic composition and total algal biovolume were determined at the end of the experiment. The periphyton composition did not change with shade but the PI curves were significantly affected by it. I k increased linearly with increasing percent irradiance transmittance (%IT = 1−%shade). P max could be fitted with a PI curve equation as it increased with %IT and leveled off after 10%IT. For each shade level, the PI curve was used to integrate daily photosynthesis for a day of average irradiance. The daily photosynthesis followed a PI curve equation with the same characteristics as P max vs. %IT. Thus, periphyton exhibited a high irradiance plasticity under 0–80% shade but could not keep up the same photosynthetic level at higher shade, causing a decrease in daily GPP at 98% shade levels. The plasticity was linked to an increase in the chl a content per cell in the 60–80% shade, while this increase was not observed at lower shade likely because it was too demanding energetically. Thus, chl a is not a good metric for periphyton biomass assessment across variously shaded habitats. It is also hypothesized that irradiance plasticity is linked to photosynthetic coupling between differently comprised algal layers arranged vertically within periphyton mats that have different PI curves.
Resumo:
HIV epidemic continues to be a severe public health problem and concern within USA and across the globe with about 33 million people infected with HIV. The frequency of drug abuse among HIV infected patients is rapidly increasing and is another major issue since injection drug users are at a greater risk of developing HIV associated neurocognitive dysfunctions compared to non-drug users infected with HIV. Brain is a major target for many of the recreational drugs and HIV. Evidences suggest that opiate drug abuse is a risk factor in HIV infection, neural dysfunction and progression to AIDS. The information available on the role of morphine as a cofactor in the neuropathogenesis of HIV is scanty. This review summarizes the results that help in understanding the role of morphine use in HIV infection and neural dysfunction. Studies show that morphine enhances HIV-1 infection by suppressing IL-8, downregulating chemokines with reciprocal upregulation of HIV coreceptors. Morphine also activates MAPK signaling and downregulates cAMP response element-binding protein (CREB). Better understanding on the role of morphine in HIV infection and mechanisms through which morphine mediates its effects may help in devising novel therapeutic strategies against HIV-1 infection in opiate using HIV-infected population.
Resumo:
This study examined origins of possible selves and the role of Epiphanies. Specifically, of interest was whether there are demographic or self-regulatory differences in possible selves derived from different origins. The sample consisted of 411 participants, with age ranging from 17 – 95. The data was taken from two previous research studies on possible selves. The first research question examined the origins of possible selves. Results indicate that possible selves are derived from Epiphany experiences along with internal and external influences, such as another person, or a particular event. The second research question determined whether there were any demographic, ethnic, or cultural differences in the origins of possible selves. Results showed age, cohort, and socioeconomic status had effects. The final research question addressed whether there were differences in the domains of possible selves derived from various origins. Results indicated differences in domains however there were no clear patterns. The first hypothesis was that possible selves derived from an Epiphany would be considered more important than those derived from other origins. This hypothesis was not supported. The second hypothesis was that hoped-for possible selves were more likely to be derived from an Epiphany experience than feared selves. This hypothesis was supported. The second hypothesis also stated that possible selves derived from an Epiphany were more likely to be balanced than selves derived from other origins and this was supported for feared selves only. Finally, the third hypothesis stated that there would be self-regulatory differences between selves derived from Epiphanies compared to other origins but this was not supported. Taken together these findings show that the origins of possible selves are important and especially those derived from epiphany. The role of an Epiphany on the formation and implementation of possible selves paves the way for important prevention programs aimed at promoting healthy development and promoting an individual’s well being.
Resumo:
In aquatic ecosystems, hydrological fluctuation may generate a gradient of lifehistory responses associated with marsh drying. This study was conducted in the Florida Everglades to document spatial and temporal variability in growth and survivorship of the bluefin killifish (Lucania goodei) from six populations along a hydroperiod gradient. The otolith-microstructure analysis of field-collected fish was used to estimate growth rate and those data were combined with field-density estimates for survivorship analysis. Otolith analysis revealed that L. goodei is extremely short-lived with no variation in growth rates and very little spatial or temporal variation in survivorship. These results suggest that bluefin killifish populations experience similar life histories across a diversity of hydroperiods either through well-mixed populations homogenizing these vital rates, or more likely, that a multitude of factors force L. goodei to respond to these "stressors" in a similar fashion across hydroperiod gradients.
Resumo:
Mice (30+-3 days old) were exposed to hypergravity (4G, one hour/day). Cross-sections of ankle extensor muscles stained immunohistochemically against slow myosin (MHC) determined if hypergravity affects the distribution of slow muscle fibers. Comparisons (ANOVA) between exposed and unexposed animals show hypergravity causes increases in slow fiber density in soleus after fourteen (p=0.049) and thirty day (p=0.Ol9) exposures. Therefore, loading may induce faster development of soleus through increased slow fiber density. Slow fibers increase in plantaris in males after seven (p=0.008) and in females after fourteen days (p=0.003), suggesting hypergravity delays normal elimination of slow fibers. Lateral and intermediate heads of lateral gastrocnemius (LG) show greater numbers of slow fibers, overall, in exposed mice (p=0.003 both). A proximal compartment of LG (LGp) and medial gastrocnemius (MG) are minimally affected by hypergravity. In LGp, only males exposed for fourteen days show decreased slow fiber density (p=0.047), but MG increased slow fiber numbers in exposed females compared to controls (p=0.04).
Resumo:
Postprostatectomy incontinence can create a significant barrier to the attainment of optimal social and physical functioning postoperatively. The objective of this retrospective, descriptive study was to determine the effect of biofeedback on the incidence of urinary incontinence in men status post radical retropubic prostatectomy (RRP). All patients of a urologic practice who had a biofeedback session preoperatively, and two sessions postoperatively, were sent a survey to complete. Correlational analysis concluded that there was no significance (p > .05) between a subject's age, educational level, or adherence to biofeedback therapy, and their level of postprostatectomy incontinence. Of those subjects who participated (n = 46), 35% reported their urinary control as excellent, 50% reported good results, and 15% reported fair results. No subjects reported poor urinary control. Ninety-five percent of subjects said they would recommend the biofeedback treatment to a friend, and 88% felt that biofeedback had helped them attain their present level of urinary control.
Resumo:
This experimental study sought to determine the effect of instruction on the abilities of first through third grade children to single and double discriminate contrasting musical characteristics. Six samples were used. The experimental variable consisted of four sessions designed to teach children to distinguish between fast/slow and smooth/choppy musical excerpts. Subjects were tested on their single/double discrimination abilities following the treatment sessions. Results show that first and second grade experimental groups scored significantly higher on single discrimination items than their control groups. On the double discrimination accuracy section the experimental second, third and control first graders were significantly higher than their counter-groups. These findings demonstrated that the four treatment sessions have a profound effect on first and second grade children's abilities to make single discriminations. They also show that success in making double discriminations may depend more on the individual subjects. Further investigation would be beneficial.
Resumo:
Acknowledgements: Thanks go to the participants of the ‘Health and Work’ Organised Session (2011) of the Scottish Economic Society 2011 Annual Conference, Perth, Scotland, for helpful comments. The authors are also grateful to the editor Franco Peracchi and the referees of this journal for helpful comments and suggestions. The financial support of the European Commission is gratefully acknowledged (HEALTHatWORK Project) — 7th Framework Programme THEME [HEALTH-2007-4.2-3] Grant Agreement No: 200716.
Resumo:
Acknowledgements: Thanks go to the participants of the ‘Health and Work’ Organised Session (2011) of the Scottish Economic Society 2011 Annual Conference, Perth, Scotland, for helpful comments. The authors are also grateful to the editor Franco Peracchi and the referees of this journal for helpful comments and suggestions. The financial support of the European Commission is gratefully acknowledged (HEALTHatWORK Project) — 7th Framework Programme THEME [HEALTH-2007-4.2-3] Grant Agreement No: 200716.
Resumo:
Funded by Chief Scientist Office, Scotland. Grant Number: CZH/4/394 Economic and Social Research Council grant as part of the National Centre for Research Methods. Grant Number: RES-576-25-0032
Resumo:
Mémoire numérisé par la Direction des bibliothèques de l'Université de Montréal.
Resumo:
Autism spectrum disorder (ASD) is a complex heterogeneous neurodevelopmental disorder characterized by alterations in social functioning, communicative abilities, and engagement in repetitive or restrictive behaviors. The process of aging in individuals with autism and related neurodevelopmental disorders is not well understood, despite the fact that the number of individuals with ASD aged 65 and older is projected to increase by over half a million individuals in the next 20 years. To elucidate the effects of aging in the context of a modified central nervous system, we investigated the effects of age on the BTBR T + tf/j mouse, a well characterized and widely used mouse model that displays an ASD-like phenotype. We found that a reduction in social behavior persists into old age in male BTBR T + tf/j mice. We employed quantitative proteomics to discover potential alterations in signaling systems that could regulate aging in the BTBR mice. Unbiased proteomic analysis of hippocampal and cortical tissue of BTBR mice compared to age-matched wild-type controls revealed a significant decrease in brain derived neurotrophic factor and significant increases in multiple synaptic markers (spinophilin, Synapsin I, PSD 95, NeuN), as well as distinct changes in functional pathways related to these proteins, including "Neural synaptic plasticity regulation" and "Neurotransmitter secretion regulation." Taken together, these results contribute to our understanding of the effects of aging on an ASD-like mouse model in regards to both behavior and protein alterations, though additional studies are needed to fully understand the complex interplay underlying aging in mouse models displaying an ASD-like phenotype.
Resumo:
Mémoire numérisé par la Direction des bibliothèques de l'Université de Montréal.