Search results for " Structures"
showing 10 items of 4162 documents
Chlamydia trachomatis Infection and Anti-Hsp60 Immunity: The Two Sides of the Coin
2009
Chlamydia trachomatis (CT) infection is one of the most common causes of reproductive tract diseases and infertility. CT-Hsp60 is synthesized during infection and is released in the bloodstream. As a consequence, immune cells will produce anti-CT-Hsp60 antibodies. Hsp60, a ubiquitous and evolutionarily conserved chaperonin, is normally sequestered inside the cell, particularly into mitochondria. However, upon cell stress, as well as during carcinogenesis, the chaperonin becomes exposed on the cell surface (sf-Hsp60) and/or is secreted from cells into the extracellular space and circulation. Reports in the literature on circulating Hsp and anti-Hsp antibodies are in many cases short on detai…
Adolescents' perception of scientific inquiry in nature : a drawing analysis
2019
This study was carried out to determine adolescents’ perception of scientific inquiry (SI) in nature and the effect of a science camp on those perceptions. Eleven science campers (14 to 16 years old) participated in this research during a science camp. Pre- and post-test included open questions and drawing tasks. The campers’ drawings were analyzed to assess their out-of-school perceptions related to SI. The aim was to clarify what phases and factors the campers associated with SI in nature, and how their perceptions differ after participating at a science camp. The findings suggest that the phases of SI were well known before the camp, but minor developments in campers’ perceptions of the …
Evidence of lipofuscin accumulation in the deep-water red shrimp Aristaeomorpha foliacea (Risso, 1827)
2008
Lipofuscin, a non-degradable, degenerative fluorescent pigment which accumulates in post-mitotic cells, represents a promising method for ageing marine crustaceans. The presence and accumulation of lipofuscin has been studied in the deep-water red shrimp Aristaeomorpha foliacea (Risso, 1827) to assess its use as a tool for ageing larger (i.e., older) specimens and thus improve knowledge of the growth and longevity of this species. Specimens, gathered during experimental trawl surveys carried out in the Strait of Sicily (Mediterranean Sea), were stored directly on-board in 10% buffered formaldehyde solution; their brain was thereafter removed, prepared with various current histological techn…
ANÁLISE DA PERCEPÇÃO DOS RESIDENTES SOBRE O IMPACTO CULTURAL E DESPORTIVO DE UM GRANDE PRÊMIO DE FÓRMULA 1
2013
The aim of this study is to analyze the resident’s perception about the cultural and sport impact of European Formula 1 Grand Prix. Cluster analysis was performed by combining hierarchical and non-hierarchical methods, which allowed us to differentiate three groups with different perceptions towards sporting event: Unfavorable, Moderate Unfavorable and Moderate Favorable. Most residents believe that this event has no significant impact to cultural and sporting level. Also, differences were found between the three groups of residents in the interest of Formula 1, the support for the event, attendance and the degree of identification.
Adaptive Whisking in Mice
2021
Rodents generate rhythmic whisking movements to explore their environment. Whisking trajectories, for one, appear as a fixed pattern of whisk cycles at 5-10 Hz driven by a brain stem central pattern generator. In contrast, whisking behavior is thought to be versatile and adaptable to behavioral goals. To begin to systematically investigate such behavioral adaptation, we established a whisking task, in which mice altered the trajectories of whisking in a goal-oriented fashion to gain rewards. Mice were trained to set the whisker to a defined starting position and generate a protraction movement across a virtual target (no touch-related tactile feedback). By ramping up target distance based o…
Gender-related variations in hemolymph parameters of Carabus lefebvrei (Coleoptera: Carabidae): HPLC analysis and phenoloxidase activity
2017
We characterized the enzymatic activity of basal and total phenoloxidase and HLPC and SDS- PAGE profiles in hemolymph of Carabus lefebvrei males and females at different reproductive status. The phenoloxidase activity was activated by trypsin and inhibited by phenoloxidase activity specific inhibitor phenylthiourea. Our results demonstrated that both in males and females, there were no significant differences in the basal phenoloxidase activity between reproductive and virgin beetles, while the total phenoloxidase activity increased significantly in virgin specimens. Thus, resources seem to be invested to increase the humoral response in pre-reproductive phase forming a barrier against path…
Efficiency of acetic acid and formic acid as a catalyst in catalytical and mechanocatalytical pretreatment of barley straw
2016
In this study, the potential of organic acids (formic acid, acetic acid) in a catalytical and mechanocatalytic conversion of lignocellulosic barley straw to valuable sugars is explored using sulfuric acid as a reference. Acid-catalyzed hydrolysis has been carried out with acid-impregnated samples as well as unmodified barley straw. In the mechanocatalytical approach, pretreatment consists of impregnation with the acid catalyst and mechanical treatment by ball milling following chemical hydrolysis. Straw samples and residues were analyzed by Fourier transform infrared spectrometry (FT-IR) whereas hydrolysate analysis was based on total reducing sugar (TRS) determination following the DNS met…
Maternal n-3 long chain polyunsaturated fatty acids increase n-3 fatty acids in brain glial cells and retina in the rat and improve rod sensitivity
2007
International audience; Purpose: To evaluate the efficacy of long chain n-3 polyunsaturated fatty acids (LC-PUFA) given to female rats during gestation and lactation on the incorporation of n-3 PUFA in the retina and brain glial cells of the newborn rat, and to evaluate the consequences on the electroretinographic (ERG) response. Methods: Sprague Dawley rats were fed during gestation and lactation with a 20%-lipid rich diet containing 0.75% of EPA and 0.55% of DHA. The fatty acid profile was analyzed in the eyeball and in brain glial cells of the litters sacrificed at birth. The retina and brain glial cell phospholipids were similarly analyzed in 14 day-old rats and in the mothers. Standard…
RPE/Choroid and Neuroretina Differences in Lipid Profile in Humans, and Possible Correlations to Dietary Lipid Intake
2008
International audience; Purpose: : To provide data on the differences in the lipid profile of the neural retina and RPE/choroid in healthy human eyes, and to establish plausible relationships with dietary fat intake, by comparing the lipid profile of the extra orbital fat. Methods: : Human eyes were collected from 28 human donors. The neural retina was dissected from the RPE/choroid. In 6 donors, the lacrimal gland and a piece of the extra orbital fat were collected. The lipid profile of the human samples was analyzed into classes. Phospholipids and cholesteryl esters were purified from RPE/choroid. The fatty acid composition of the retina, lipid fractions of RPE/choroid, and lacrimal gland…
Vendace (Coregonus albula) Disperse Their Eggs Widely during Spawning
2021
Depending on their reproductive strategy, different fish species either aggregate or disperse eggs and larvae in their reproductive habitat. Because yolk-sac larvae of vendace (Coregonus albula) disperse widely across the littoral and pelagic zones of boreal lakes, it is unclear where the exact spawning and egg incubation locations are. Vendace egg and larvae densities were studied in Lake Southern Konnevesi to clarify its spawning strategy. In autumn 2019, 1–2 weeks prior to spawning, 500 egg samplers were installed in five depth zones in 20 sampling plots. Fertilized eggs were found in 18 plots. The mean density of eggs was 74 eggs m–2 and the mean fertilization rate 85%. During spawning,…