Studies Studies show that genetic polymorphisms in apolipoproteins, which are in charge of lipid transport, predispose to atherogenic dyslipidemia. This study aimed intake to investigate the impact of apolipoprotein E, A5, and B genotypes and dietary intake on lipid profile in a sample allele of elderly women in Brazil. Two hundred and fifty-two women (60 years or older) living in the outskirts of the sample Brazilian Federal District underwent clinical and laboratory assessments to characterize glycemic and lipidemic variables, and also to exclude confounding factors evaluations (smoking, drinking, hormone replacement, cognitive impairment, physical activity). Three-day food records were used to determine usual dietary intake, whereas genotypic with evaluations were in accordance to established methodologies. Genotype frequencies were consistent with the Hardy-Weinberg equilibrium. Prior to adjustment, individuals carrying whereas the epsilon2 allele showed higher serum levels of triglycerides (P < .05) and VLDL (P < .005) compared to epsilon4 individuals carriers, whereas LDL levels were considerably elevated in epsilon4 compared to epsilon2 carriers. In the presence of high intake of investigate total fat or a low ratio of polyunsaturated to saturated fatty acid, epsilon4 carriers lost protection against hypertriglyceridemia. There was the no association of the apolipoprotein A5 and B genotypes with lipidemic levels independently of the fat intake regimen. Results are the suggestive of a dysbetalipoproteinemic-like phenotype in postmenopausal women, with remarkable gene-diet interaction.

The The role of physical activity in affecting the composition of extracellular matrix and mechanical properties of tendons has been well studied,the but little is known about the role of passive stretching. The purpose of this study was to test the hypothesis removed that stimulation by passive stretching may change the composition and mechanical properties of tendons. Three-month-old Wistar rats were divided into stretching. three groups: the control, animals were not submitted to stretching procedures; groups that had their calcaneal tendons manually stretched three tendons or five times a week, for 21 days. Afterward, the calcaneal tendons were removed and assayed for hydroxyproline content and leads biomechanical test. The hydroxyproline content in the stretched groups was higher, suggesting that more collagen was present in the tendons stretched of these groups. These tendons also showed higher values of maximum stress and modulus of elasticity or Young's modulus. These calcaneal results indicate that stretching leads to alterations in the synthesis of the extracellular matrix components and in the mechanical properties has of tendons.

In In this work, spatial and temporal variations in the diversity (species richness and Simpson's Diversity Index) and abundance (indexed by the of capture per unit effort - CPUE; total and for reproductive groups) of fish from three rivers (Baía, Ivinheima and Paraná)relationships located in a floodplain of the Upper Paraná River basin were analyzed over a period of 20 years (1987-2007). In (Baía, addition, we evaluated the relationships of these ecological attributes with variations in the hydrologic regime, considering the possible effects of hydrometric natural (climatic events) and artificial (discharge control by dams) disturbances. Annual variations in hydrometric attributes were calculated using PULSO software and and daily water level data. We applied analysis of covariance to determine the relationships between ecological and hydrometric attributes, the of latter summarized in axes of a principal component analysis. Lower values of the fish assemblage attributes (diversity and abundance) were to registered in the Paraná River. Species richness, total CPUE and CPUE of long-distance migratory species were positively related to the capture duration of the floods and the connectivity of the area. Variations in the annual hydrological cycle and their effects on capture fish assemblage appear to be affected by extreme natural (ENSO) and artificial (discharge control by dams) events.

In In this study, we identified and characterized the hydrographic attributes related to the success of recruitment of migratory fishes in the Recruitment Upper Paraná River floodplain. To achieve our objectives, we analyzed inter-annual variations in the abundance of young-of-the-year (YOY; index of flood. recruitment) of six migratory species and their relations with hydrographic attributes. Recruitment was related to the intensity, duration (in different different fluviometrical levels), elasticity, number of pulses, greater uninterrupted overflow and delay of the floods (all obtained using the PULSO software).of Collections of fish were conducted in the period between January 1987 and November 2007 in distinct environments (river channels, secondary located channels and connected and disconnected floodplain lakes) distributed along three subsystems (Paraná, Baía and Ivinheima). Relations between recruitment and the all attributes of interest were determined through analysis of covariance. In the studied period, the highest abundances of YOY were registered (limnophase) in 2007, followed by 1992, 1993, 2005 and 1988. The abundance of YOY was positively correlated with an intensity of the high water levels (potamophase) and the duration of potamophase 1 and negatively with the duration of low water levels (limnophase)the and a delay of flood. Higher hydrometric levels (540 and 610 cm for Paraná and 325 and 450 cm for a Ivinheima) and greatest uninterrupted overflow presented different relations (significant interactions) among subsystems, but all with positive effects on recruitment. Results through evidenced that recruitment responded better when floods started in January with potamophase intensities above 610 cm and water levels above this 450 cm over a period of 50 days and repeated every two years (or > 610 cm for 38 days 450 and repeated every two or three years). Therefore, artificial control of the floods at intervals of two or three years a by manipulating the discharge of dams located upstream from the floodplain in a way that promotes potamophases with the potential two to ensure recruitment of migratory species may become an important tool for conservation of migratory fish species in the floodplain.Collections

The The need for prediction is widely recognized in limnology. In this study, data from 25 lakes of the Upper Paraná River to floodplain were used to build models to predict chlorophyll-a and dissolved oxygen concentrations. Akaike's information criterion (AIC) was used as positive a criterion for model selection. Models were validated with independent data obtained in the same lakes in 2001. Predictor variables oxygen that significantly explained chlorophyll-a concentration were pH, electrical conductivity, total seston (positive correlation) and nitrate (negative correlation). This model explained 52% 52% of chlorophyll variability. Variables that significantly explained dissolved oxygen concentration were pH, lake area and nitrate (all positive correlations);the water temperature and electrical conductivity were negatively correlated with oxygen. This model explained 54% of oxygen variability. Validation with independent 54% data showed that both models had the potential to predict algal biomass and dissolved oxygen concentration in these lakes. These and findings suggest that multiple regression models are valuable and practical tools for understanding the dynamics of ecosystems and that predictive Upper limnology may still be considered a powerful approach in aquatic ecology.

Flood Flood pulses affect floodplain enrichment via the incorporation of nutrients and terrestrial biomass. As a result, they positively affect the body in condition of aquatic organisms. This paper evaluates whether the absence of floods (resulting from dam control) affects the feeding activity ambusher and body condition of piscivorous fish. In addition, whether piscivores respond similarly to alterations in the flooding regime was assessed.were Five piscivorous species were selected (Acestrorhynchus lacustris, Hoplias aff. malabaricus, Plagioscion squamosissimus, Rhaphiodon vulpinus, and Salminus brasiliensis). The fish were performed captured in four distinct years and in three river subsystems with differentiated water level fluctuations (Ivinheira = not regulated; Baía of = regulated by the Paraná River level; Paraná = regulated by dams). Feeding activity and body condition were evaluated using activity the mean values of the standard residuals generated by regression models between body and stomach weights and standard length and the body weight (all log-transformed). Differences among years and subsystems were evaluated via two-way analysis of variance. Pearson and Spearman correlations control) were performed between flooding attributes (duration, amplitude, timing, and daily variability) and feeding activity and body condition. Feeding activity differed affects across subsystems, whereas body condition varied across years, depending on the subsystem. Hoplias aff malabaricus (an ambusher adapted to starvation)Hoplias presented feeding activity independent of the flooding regime and also presented better body condition in times of high water levels.and Rhaphidon vulpinus exhibited variations in feeding activity but did not present alterations in body condition. The other species presented poorer affect body condition in years or subsystems with regular floods. Correlations identified that the duration and timing of floods had negative of effects on body condition, whereas amplitude and mean annual water level improved feeding activity. Therefore, regular floods affect the feeding had activity and body condition of piscivorous fish, and the response of each species depends on the existence or absence of and pre-adaptation to long periods of starvation. Consequently, considering the role of the flood pulse in determining the availability of feeding and resources for early life stages of piscivores, control of the flood pulse by dams is also disadvantageous for piscivorous fish.affects

Abstract Abstract Blowflies use discrete, ephemeral substrates for larval development. After exhaustion of the food supply, larvae will disperse in search of larval sites to burrow and pupate or will seek other sources of food in a process known as post-feeding larval dispersal.by In this study, the effect of temperature was investigated as it is one of the most important aspects of the effect environmental variables in this process. 800 larvae of the blowflies Chrysomya albiceps (Wiedemann 1819) and Lucilia cuprina (Wiedemann 1830)(Diptera:to Calliphoridae) were incubated in tubes covered with vermiculite at 15, 20, 25 and 30 degrees C. For each pupa, the in body weight, sex and depth of burrowing were determined. Statistical tests were used to examine the relationship of depth of burrowed burrowing and body weight to the temperature at which burrowing occurred. Depth of burrowing was affected differently by temperature for burrowing both of the species studied; L. cuprina larvae burrowed deeper at lower and higher temperatures while C. albiceps larvae burrowed pupate less at extreme temperatures. Additionally, temperature had a significant effect on the body weight of L. cuprina larvae as body or weight decreased as temperature increased, whereas for C. albiceps, pupal weight increased up to 25 degrees C and then decreased affected abruptly at a higher temperatures. The maximum body weight was also differently affected in the two species; in L. cuprina,30 the maximal weight was at 15 degrees C and for C. albiceps weight was maximal at 20 degrees C.

Immune Immune protection by the complement system critically depends on assembly of C3 convertases on the surface of pathogens and altered host which cells. These short-lived protease complexes are formed through pro-convertases, which for the alternative pathway consist of the complement component C3b C3b and the pro-enzyme factor B (FB). Here, we present the crystal structure at 2.2-A resolution, small-angle X-ray scattering and electron pathway microscopy (EM) data of the pro-convertase formed by human FB and cobra venom factor (CVF), a potent homologue of C3b loaded that generates more stable convertases. FB is loaded onto CVF through its pro-peptide Ba segment by specific contacts, which explain the the specificity for the homologous C3b over the native C3 and inactive products iC3b and C3c. The protease segment Bb carboxy binds the carboxy terminus of CVF through the metal-ion dependent adhesion site of the Von Willebrand factor A-type domain. A for possible dynamic equilibrium between a 'loading' and 'activation' state of the pro-convertase may explain the observed difference between the crystal altered structure of CVFB and the EM structure of C3bB. These insights into formation of convertases provide a basis for further host development of complement therapeutics.

We We report here the observation of the enhancement of Europium-tetracycline complex emission in Low Density Lipoprotein (LDL) solutions. Europium emission band Lipoprotein of tetracycline solution containing Europium (III) chloride hexahydrate was tested to obtain effective enhancement in the presence of native LDL in and oxidized LDL. Europium emission lifetime in the presence of lipoproteins was measured, resulting in a simple method to measure Europium the lipoproteins quantity in an aqueous solution at physiological pH. This method shows that the complex can be used as emission a sensor to determine the different states of native and oxidized LDL in biological fluids.