Characterization of the biofilm structure and microbial diversity of sulfate-reducing bacteria from petroleum produced water supplemented by different carbon sources.

Colonization by sulfate-reducing bacteria (SRB) in environments associated with oil is mainly dependent on the availability of sulfate and carbon sources. The formation of biofilms by SRB increases the corrosion of pipelines and oil storage tanks, representing great occupational and operational risks and respective economic losses for the oil industry. The aim of this study was to evaluate the influence of the addition of acetate, butyrate, lactate, propionate and oil on the structure of biofilm formed in carbon steel coupons, as well as on the diversity of total bacteria and SRB in the planktonic and sessile communities from petroleum produced water. The biofilm morphology, chemical composition, average roughness and the microbial diversity was analyzed. In all carbon sources, formation of dense biofilm without morphological and/or microbial density differences was detected, with the most of cells observed in the form of individual rods. The diversity and richness indices of bacterial species in the planktonic community was greater than in the biofilm. Geotoga was the most abundant genus, and more than 85% of SRB species were common to all treatments. The functional predicted profile shown that the observed genres in planktonic communities were related to the reduction of sulfate, sulfite, elementary sulfur and other sulfur compounds, but the abundance varied between treatments. For the biofilm, the functions predicted profile for the oil treatment was the one that most varied in relation to the control, while for the planktonic community, the addition of all carbon sources interfered in the predicted functional profile. Thus, although it does not cause changes in the structure and morphology biofilm, the supplementation of produced water with different carbon sources is associated with changes in the SRB taxonomic composition and functional profiles of the biofilm and the planktonic bacterial communities.

The bandwidth knowledge of results regarding the task of the overhand serve in volleyball

Abstract Aim: Motor learning is considered a complex process, providing numerous investigations. Knowledge of Results (KR), a kind of extrinsic feedback, is one of the variables that are used for investigations on motor learning. There are different ways to provide KR to optimize motor learning. The bandwidth KR is one of these forms, being a factor that affects motor learning, however, the specificity of the task needs to be considered in the investigation of this theme. Thus, the objective of the study is to analyze the bandwidth of KR in the acquisition of motor skills of the overhand serve in volleyball. Methods: The sample consisted of 24 volunteers of both sexes (12 men and 12 women), 18 to 35 years of age (M = 27, SD = 3.46) and inexperienced in the task. The effect of the bandwidth was analyzed in two groups (with range and without range), in which the volunteers had to learn to control their force by performing the volleyball tennis type service in order to hit a target line. Performance was inferred by the mean and standard deviation of absolute, constant and variable errors. Results: There was no statistically significant difference between the groups and the volunteers improved both the precision (absolute error and constant error) and in the consistency (variable error) during the acquisition. There was an improvement in the groups also in the transfer test in the precision measures. Conclusion: The variable bandwidth is similar to a control condition in which the volunteers have information at each attempt, causing dependence on external information.

Assessing the relationship between the rumen microbiota and feed efficiency in Nellore steers.

BACKGROUND: Ruminants rely upon a complex community of microbes in their rumen to convert host-indigestible feed into nutrients. However, little is known about the association between the rumen microbiota and feed efficiency traits in Nellore (Bos indicus) cattle, a breed of major economic importance to the global beef market. Here, we compare the composition of the bacterial, archaeal and fungal communities in the rumen of Nellore steers with high and low feed efficiency (FE) phenotypes, as measured by residual feed intake (RFI). RESULTS: The Firmicutes to Bacteroidetes ratio was significantly higher (P < 0.05) in positive-RFI steers (p-RFI, low feed efficiency) than in negative-RFI (n-RFI, high feed efficiency) steers. The differences in bacterial composition from steers with high and low FE were mainly associated with members of the families Lachnospiraceae, Ruminococcaceae and Christensenellaceae, as well as the genus Prevotella. Archaeal community richness was lower (P < 0.05) in p-RFI than in n-RFI steers and the genus Methanobrevibacter was either increased or exclusive of p-RFI steers. The fungal genus Buwchfawromyces was more abundant in the rumen solid fraction of n-RFI steers (P < 0.05) and a highly abundant OTU belonging to the genus Piromyces was also increased in the rumen microbiota of high-efficiency steers. However, analysis of rumen fermentation variables and functional predictions indicated similar metabolic outputs for the microbiota of distinct FE groups. CONCLUSIONS: Our results demonstrate that differences in the ruminal microbiota of high and low FE Nellore steers comprise specific taxa from the bacterial, archaeal and fungal communities. Biomarker OTUs belonging to the genus Piromyces were identified in animals showing high feed efficiency, whereas among archaea, Methanobrevibacter was associated with steers classified as p-RFI. The identification of specific RFI-associated microorganisms in Nellore steers could guide further studies targeting the isolation and functional characterization of rumen microbes potentially important for the energy-harvesting efficiency of ruminants.

Effect of the ingestion of vegetable oils associated with energy-restricted normofat diet on intestinal microbiota and permeability in overweight women.

Previous studies suggest that the type of dietary fatty acid may modulate the intestinal bacterial ecosystem. However, this effect is still inconclusive. Thus, the aim of this study was to investigate the effect of the intake of vegetable oils rich in different types of fatty acids, associated with energy-restricted normofat diets, on the composition of intestinal microbiota and permeability, on LPS concentrations, and fecal short chain fatty acids and pH. This was a 9 consecutive weeks (±5 days), randomized, parallel, double-blind clinical trial. Overweight women received daily breakfast containing 25 mL of one of the test oils: soybean oil (n = 17), extra virgin olive oil (n = 19) or coconut oil (n = 16). Blood, fecal and urine samples were collected on the first and last day of the experiment for the analysis of the variables of interest. The consumption of the three oils did not affect the diversity and relative abundance of intestinal bacteria. We observed an increase in bacterial richness estimated by the Chao 1 index, and a reduction in the concentration of isovaleric fatty acid in the group that ingested soybean oil. Paracellular and transcellular permeability increased after the ingestion of extra virgin olive oil and coconut oil. However, LPS concentrations remained unchanged. The intake of different types of fatty acids associated with the energy-restricted normofat diet modestly affected the intestinal microbiota and permeability, without resulting in metabolic endotoxemia in overweight women.

Morphology and composition of the midgut bacterial community of Scaptocoris castanea Perty, 1830 (Hemiptera: Cydnidae).

The burrower bug Scaptocoris castanea is an important soybean and pasture pest in Brazil, with an underground habit feeding directly on the sap of the roots. Underground habit hinders control and knowledge of the biology and physiology of this pest. This study describes the anatomy, histology, ultrastructure and symbionts of the midgut of S. castanea. The midgut of S. castanea is anatomically divided into five regions (ventricles). Ventricles 1-3 are similar between males and females, with cells specialized in digestion and absorption of nutrients, water transport and homeostasis. Ventricle 4 has squamous epithelium forming crypts and harboring bacteria in the lumen. Ventricle 5 of males is small with cells containing apical microvilli and broad basal folds with many openings for hemocoel, while in females, this region of the midgut is well developed and colonized by intracellular bacteria, characterizing bacteriocytes. The main bacteria are Gammaproteobacteria. The results show sexual dimorphism in ventricle 5 of the midgut of S. castanea, with formation of bacteriocytes in the females, while the other regions are involved in digestive processes in both sexes.

The Bacterial and Fungal Microbiota of Nelore Steers Is Dynamic Across the Gastrointestinal Tract and Its Fecal-Associated Microbiota Is Correlated to Feed Efficiency.

The ruminant gastrointestinal tract (GIT) microbiome plays a major role in the health, physiology and production traits of the host. In this work, we characterized the bacterial and fungal microbiota of the rumen, small intestine (SI), cecum and feces of 27 Nelore steers using next-generation sequencing and evaluated biochemical parameters within the GIT segments. We found that only the bacterial microbiota clustered according to each GIT segment. Bacterial diversity and richness as well as volatile fatty acid concentration was lowest in the SI. Taxonomic grouping of bacterial operational taxonomic units (OTUs) revealed that Lachnospiraceae (24.61 ± SD 6.58%) and Ruminococcaceae (20.87 ± SD 4.22%) were the two most abundant taxa across the GIT. For the fungi, the family Neocallismastigaceae dominated in all GIT segments, with the genus Orpinomyces being the most abundant. Twenty-eight bacterial and six fungal OTUs were shared across all GIT segments in at least 50% of the steers. We also evaluated if the fecal-associated microbiota of steers showing negative and positive residual feed intake (n-RFI and p-RFI, respectively) was associated with their feed efficiency phenotype. Diversity indices for both bacterial and fungal fecal microbiota did not vary between the two feed efficiency groups. Differences in the fecal bacterial composition between high and low feed efficiency steers were primarily assigned to OTUs belonging to the families Lachnospiraceae and Ruminococcaceae and to the genus Prevotella. The fungal OTUs shared across the GIT did not vary between feed efficiency groups, but 7 and 3 OTUs were found only in steers with positive and negative RFI, respectively. These results provide further insights into the composition of the Nelore GIT microbiota, which could have implications for improving animal health and productivity. Our findings also reveal differences in fecal-associated bacterial OTUs between steers from different feed efficiency groups, suggesting that fecal sampling may represent a non-invasive strategy to link the bovine microbiota with productivity phenotypes.

Comprehensive analysis of immune, extracellular matrices and pathogens profile in lung granulomatosis of unexplained etiology.

This study analyzed the type 1 and type 2T helper (Th1/Th2) cytokines (including interleukins), immune cellular, matrix profile, and pathogens in granulomas with unexplained etiology compared to those with infectious and noninfectious etiology. Surgical lung biopsies from 108 patients were retrospectively reviewed. Histochemistry, immunohistochemistry, immunofluorescence, morphometry and polymerase chain reaction were used, respectively, to evaluate total collagen and elastin fibers, collagen I and III, immune cells, cytokines, matrix metalloproteinase-9, myofibroblasts, and multiple usual and unusual pathogens. No relevant polymerase chain reaction expression was found in unexplained granulomas. A significant difference was found between the absolute number of eosinophils, macrophages, and lymphocytes within granulomas compared to uninvolved lung tissue. Granulomas with unexplained etiology (UEG) presented increased number of eosinophils and high expression of interleukins (ILs) IL-4/IL-5 and transforming growth factor-ß. In sarcoidosis, CD4/CD8 cell number was significantly higher within and outside granulomas, respectively; the opposite was detected in hypersensitivity pneumonitis. Again, a significant difference was found between the high number of myofibroblasts and matrix metalloproteinase-9 in UEG, hypersensitivity pneumonitis, and sarcoidosis compared to granulomas of tuberculosis. Granulomas of paracoccidioisis exhibited increased type I collagen and elastic fibers. Th1 immune cellular profile was similar among granulomas with unexplained, infectious, and noninfectious etiology. In contrast, modulation of Th2 and matrix remodeling was associated with more fibroelastogenesis and scarring of lung tissue in UEG compared to infectious and noninfectious. We concluded that IL-4/IL-5 and transforming growth factor-ß might be used as surrogate markers of early fibrosis, reducing the need for genotyping, and promise therapeutic target in unexplained granulomas.

Hidrocefalia de pressão normal: visão atual sobre a fisiopatologia, diagnóstico e tratamento / Normal pressure hydrocephalus: current view on pathophysiology, diagnosis and treatment

Introdução: A hidrocefalia de pressão normal (HPN), descrita em 1964 por Salomón Hakim, é uma doença insidiosa que acomete, sobretudo, idosos e manifesta-se através da tríade clínica de distúrbios da marcha, demência e incontinência urinária, associada a achados radiológicos de ventriculomegalia e achados laboratoriais de pressão liquórica normal. Objetivo: apresentar as principais hipóteses relacionadas à fisiopatologia, diagnóstico por imagem e tratamento da HPN empregadas atualmente. Métodos: a revisão da literatura foi realizada através das bases de dados MEDLINE e PubMed, onde foi utilizado o recurso MeSH(Medical Subject Headings) para a seleção de artigos dos últimos seis anos. Resultados: tanto as bases fisiopatológicas quanto os critérios diagnósticos da HPN ainda não estão totalmente estabelecidos. O principal tratamento consiste na derivação liquórica. Conclusões: é fundamental que o diagnóstico da HPN seja realizado precocemente e que os pacientes com maiores chance de responder à derivação liquórica sejam identificados.

Introduction: The normal pressure hydrocephalus (NPH), described in 1964 by Salomón Hakim, is an insidious disease that affects mainly elderly people and is manifested by the clinical triad of gait disorders, dementia and urinary incontinence associated with radiological findings of ventriculomegaly and laboratory findings of normal CSF pressure. Objective: present the main hypotheses related to the pathophysiology, imaging diagnosis and treatment of NPH in practice today. Methods: the literature review was conducted through MEDLINE and PubMed, where was used the MeSH resource (Medical Subject Headings) for the selection of articles from the last 6 years. Results: both the pathophysiology and diagnostic criteria of NPH has not beenfully established. The main treatment consists of the CSF shunt. Conclusion: it is essential that the diagnosis of NPH be realized early and that patients with higher chance to improve after CSF shunt are identified.

Hidrocefalia de pressão normal: visão atual sobre a fisiopatologia, diagnóstico e tratamento / Normal pressure hydrocephalus: current view on pathophysiology, diagnosis and treatment

A hidrocefalia de pressão normal (HPN), descrita em 1964 por Salomón Hakim, é uma doença insidiosa que acomete, sobretudo, idosos entre 60 e 80 anos e manifesta-se por meio da tríade clínica de distúrbios da marcha, demência e incontinência urinária, associada a achados radiológicos de ventriculomegalia e achados laboratoriais de pressão liquórica normal. Apesar de representar cerca de 5% das causas de demência, ficando atrás da doença de Alzheimer e demência vascular, ao contrário dessas causas a HPN é uma das poucas causas reversíveis de demência, e é por essa reversibilidade que torna fundamental o conhecimento da doença por parte de todos os médicos que cuidam dos pacientes dessa faixa etária. O artigo foi realizado a fim de apresentar as principais hipóteses relacionadas a fisiopatologia, diagnóstico e tratamento da HPN empregadas atualmente. A revisão da literatura foi realizada por meio das bases de dados Medline e PubMed, sendo utilizado o recurso MeSH (Medical Subject Headings) para a combinação dos descritores (hidrocefalia de pressão normal, história, epidemiologia, etiologia, fisiopatologia, diagnóstico e terapia) e seleção de artigos dos últimos seis anos. Tanto as bases fisiopatológicas quanto os critérios diagnósticos da HPN ainda não estão totalmente estabelecidos, porém as principais hipóteses envolvem distúrbios da hemodinâmica e complacência cerebral. O principal tratamento consiste na derivação liquórica, mediante a derivação ventriculoperitoneal e da terceira ventriculostomia endoscópica, sendo fundamental que o diagnóstico da HPN seja realizado precocemente e que os pacientes com maiores chances de responder à derivação liquórica sejam identificados.

The normal pressure hydrocephalus (NPH), described in 1964 by Salomón Hakim, is an insidious disease that affects mainly elderly people between 60 and 80 years and is manifested by the clinical triad of gait disturbances, dementia and urinary incontinence associated the radiological findings of ventriculomegaly and laboratory findings of normal cerebrospinal fluid pressure. Despite representing about 5% of the causes of dementia, behind Alzheimer?s disease and vascular dementia, unlike these causes NPH is one of the few reversible causes of dementia, and it is this reversibility that makes crucial the knowledge of the disease by of all physicians who care of patients in this age group. The paper was developed in order to present the main hypotheses related to the pathophysiology, diagnosis and treatment of NPH in practice today. The literature review was conducted through Medline and PubMed, where was used the MeSH resource (Medical Subject Headings) for the combination of keywords (normal pressure hydrocephalus, history, epidemiology, etiology, pathophysiology, diagnosis and therapy and selection of articles from the last six years. Both the pathophysiology and diagnostic criteria of NPH has not been fully established, but the main hypotheses involve disturbances of cerebral hemodynamics and complacency. The main treatment consists of CSF shunt through the ventriculoperitoneal shunt and endoscopic third ventriculostomy and it?s essential that the diagnosis of NPH be realized early and that patients with higher chance to improve after CSF shunt are identified.