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Oxygen consumption

Natalia Crespo Tapia, Heidy M W den Besten, Tjakko Abee
Listeria monocytogenes is a food-borne pathogen that can grow as a biofilm on surfaces. Biofilm formation in food-processing environments is a big concern for food safety, as it can cause product contamination through the food-processing line. Although motile aerobic bacteria have been described to form biofilms at the air-liquid interface of cell cultures, to our knowledge, this type of biofilm has not been described in L. monocytogenes before. In this study we report L. monocytogenes biofilm formation at the air-liquid interface of aerobically grown cultures, and that this phenotype is specifically induced when the media is supplemented with glycerol as a carbon and energy source...
March 15, 2018: International Journal of Food Microbiology
Rungchai Chaunchaiyakul, Metta Pinthong, Amornpan Ajjimaporn
OBJECTIVE: This study measured acute physiological responses in pregnant women during short duration exercise in the supine (Sup), side-lying (Side), sitting (Sit), and standing (Std) positions. METHODS: In a cross-sectional study, 42 healthy pregnant women were divided into 3 groups of 14 persons each: G1, G2, and G3 (first, second, and third trimester, respectively). Baseline assessments were performed following a 30-min rest in the sitting position. Subsequent measurements were then obtained while exercising, without resistance, in the Sup, Side, Sit, and Std, respectively...
March 20, 2018: Physiotherapy Theory and Practice
Ji-Sun Kim, Hyunjung Lee, Chang Hwa Jung, Sung-Joon Lee, Tae-Youl Ha, Jiyun Ahn
Mitochondrial dysfunction is associated with insulin resistance. Although chicoric acid (CA) is known to have beneficial effects on insulin sensitivity, the involvement of mitochondrial function has not been elucidated yet. Here, we investigated the effect of CA on insulin resistance and mitochondrial dysfunction. In palmitate-induced insulin-resistant C2C12 myotubes, CA improved impaired glucose uptake and insulin signaling pathways, along with enhanced mitochondrial membrane potential and oxygen consumption...
March 20, 2018: Bioscience, Biotechnology, and Biochemistry
Mitchell Kuss, Jiyoung Kim, Dianjun Qi, Shaohua Wu, Yuguo Lei, Soonkyu Chung, Bin Duan
Obesity and its related health complications cause billions of dollars in healthcare costs annually in the United States, and there are yet to be safe and long-lasting anti-obesity approaches. Using brown adipose tissue (BAT) is a promising approach, as it uses fats for energy expenditure. However, the effect of the microenvironment on human thermogenic brown adipogenesis and how to generate clinically relevant sized and functioning BAT are still unknown. In our current study, we evaluated the effects of endothelial growth medium exposure on brown adipogenesis of human brown adipose progenitors (BAP)...
March 16, 2018: Acta Biomaterialia
Maysa M Cruz, Andressa B Lopes, Amanda R Crisma, Roberta C C de Sá, Wilson M T Kuwabara, Rui Curi, Paula B M de Andrade, Maria I C Alonso-Vale
BACKGROUND: We have recently demonstrated that palmitoleic acid (16:1n7) increases lipolysis, glucose uptake and glucose utilization for energy production in white adipose cells. In the present study, we tested the hypothesis that palmitoleic acid modulates bioenergetic activity in white adipocytes. METHODS: For this, 3 T3-L1 pre-adipocytes were differentiated into mature adipocytes in the presence (or absence) of palmitic (16:0) or palmitoleic (16:1n7) acid at 100 or 200 μM...
March 20, 2018: Lipids in Health and Disease
Alessandro L Colosio, S Pogliaghi
INTRODUCTION: Performance during army loaded runs provides a synthetic indicator of a soldier's capacity to move while carrying loads and thereby remain able to execute a mission. The aim of this study was to estimate and compare the energy expenditure (EE) of army loaded runs, conducted in a field environment using laboratory-based equations and HR index (HRindex ). METHODS: 45 Ranger recruits had HR monitored during three loaded runs (10, 15 and 20 km) in full military equipment in the field environment...
March 17, 2018: Journal of the Royal Army Medical Corps
Edna M S Oliveira, Francisco R Silva, Crislânia C O Morais, Thiago Mielle B F Oliveira, Carlos A Martínez-Huitle, Artur J Motheo, Cynthia C Albuquerque, Suely S L Castro
This study investigated the anodic oxidation of phenolic wastewater generated by cashew-nut processing industry (CNPI) using active (Ti/RuO2 -TiO2 ) and inactive (boron doped diamond, BDD) anodes. During electrochemical treatment, various operating parameters were investigated, such as current density, chemical oxygen demand (COD), total phenols, O2 production, temperature, pH, as well as current efficiency and energy consumption. After electrolysis under optimized working conditions, samples were evaluated by chromatography and toxicological tests against L...
February 9, 2018: Chemosphere
Nobuhisa Ishii, Kazuhide Tomita, Shinsuke Suetake, Yukako Okuno, Kenta Kawamura, Reiko Takeshima, Hirotaka Ohse, Shigeyuki Imura
[Purpose] It is unclear whether diaphragmatic breathing (DB) results in lower respiratory muscle oxygen consumption during dynamic exercise. The purpose of this study was to compare oxygen consumption in the respiratory muscles (VO2 rm) with thoracic breathing (TB) and with DB, in healthy males during hyperventilation. [Subjects and Methods] Ten healthy men participated in this study. The subjects sat on a chair with the backrest reclined at an angle of 60 degrees. Respiratory parameters were measured breath by breath, using an expired gas analyzer...
February 2018: Journal of Physical Therapy Science
Junjian Zheng, Zhiwei Wang, Jinxing Ma, Shaoping Xu, Zhichao Wu
Inability to remove low molecular weight anthropogenic contaminants is a critical issue in low-pressure membrane filtration processes for water treatment. In this work, a novel electrochemical ceramic membrane filtration (ECMF) system using TiO2@SnO2-Sb anode was developed for removing persistent p-chloroaniline (PCA). Results showed that the ECMF system achieved efficient removal of PCA from contaminated waters. At a charging voltage of 3 V, the PCA removal rate of TiO2@SnO2-Sb ECMF system under flow-through mode was 2...
March 15, 2018: Environmental Science & Technology
Nur S Ibrahim, Chee K Chen, Ayunizma Ayub, Ayu S Muhamad
Introduction: Lysozyme is one of the salivary antimicrobial proteins which act as the "first line of defence" at the mucosal surface. The effects of prolonged exercise in the hot and cool environments among recreational athletes on salivary lysozyme responses are very limited in the literature, especially in the Asian countries. Objective: To determine the effects of prolonged running in the hot and cool environments on selected physiological parameters and salivary lysozyme responses among recreational athletes...
December 2017: Journal of Exercise Science and Fitness
Héctor Miranda-Astudillo, Lilia Colina-Tenorio, Alejandra Jiménez-Suárez, Miriam Vázquez-Acevedo, Bénédicte Salin, Marie-France Giraud, Claire Remacle, Pierre Cardol, Diego González-Halphen
The proposal that the respiratory complexes can associate with each other in larger structures named supercomplexes (SC) is generally accepted. In the last decade's most of the data about this association came from studies in yeasts, mammals and plants, and information is scarce in other lineages. Here we studied the supramolecular association of the F1 FO -ATP synthase (complex V) and the respiratory complexes I, III and IV of the colorless alga Polytomella sp. with an approach that involves solubilization using mild detergents, n-dodecyl-β-D-maltoside (DDM) or digitonin, followed by separation of native protein complexes by electrophoresis (BN-PAGE), after which we identified oligomeric forms of complex V (mainly V2 and V4 ) and different respiratory supercomplexes (I/IV6 , I/III4 , I/IV)...
March 11, 2018: Biochimica et Biophysica Acta
Michael L Ekaney, Gabrielle Gonzalez Gray, Iain H McKillop, Susan L Evans
BACKGROUND: Limited availability and use of whole blood (WB) following trauma is driven by perceptions that hemostatic function is limited by platelet dysfunction within 5 days storage. We sought to define the hemostatic function of WB stored at 4°C for up to 25 days, elucidate changes in metabolic parameters and mitochondrial dysfunction in platelets in WB, and the effect of supplementation using resveratrol (Res) or cytochrome c (Cyt c). METHODS: WB was collected, aliquoted, and stored at 4°C without agitation...
March 12, 2018: Journal of Trauma and Acute Care Surgery
Daniela G L Terson de Paleville, Susan J Harkema, Claudia A Angeli
CONTEXT: Four individuals with motor complete SCI with an implanted epidural stimulator who were enrolled in another study were assessed for cardiovascular fitness, metabolic function and body composition at four time points before, during, and after task specific training. Following 80 locomotor training sessions, a 16-electrode array was surgically placed on the dura (L1-S1 cord segments) to allow for electrical stimulation. After implantation individuals received 160 sessions of task specific training with epidural stimulation (stand and step)...
March 14, 2018: Journal of Spinal Cord Medicine
Silvia Ravera, Maria Grazia Signorello, Martina Bartolucci, Sara Ferrando, Lucia Manni, Federico Caicci, Daniela Calzia, Isabella Panfoli, Alessandro Morelli, Giuliana Leoncini
BACKGROUND INFORMATION: Energy demand in human platelets is very high, to carry out their functions. As for most human cells, the aerobic metabolism represents the primary energy source in platelets, even though mitochondria are negligibly represented. Following the hypothesis that other structures could be involved in chemical energy production, in this work, we have investigated the functional expression of an extramitochondrial aerobic metabolism in platelets. RESULTS: Oximetric and luminometric analyses showed that platelets consume large amounts of oxygen and produce ATP in the presence of common respiring substrates, such as pyruvate + malate or succinate, although morphological electron microscopy analysis showed that these contain few mitochondria...
March 14, 2018: Biology of the Cell
David H Jang, Utsha G Khatri, Anita Mudan, Jennifer S Love, Shawn Owiredu, David M Eckmann
It is conservatively estimated that 5,000 deaths per year and 20,000 injuries in the USA are due to poisonings caused by chemical exposures (e.g., carbon monoxide, cyanide, hydrogen sulfide, phosphides) that are cellular inhibitors. These chemical agents result in mitochondrial inhibition resulting in cardiac arrest and/or shock. These cellular inhibitors have multi-organ effects, but cardiovascular collapse is the primary cause of death marked by hypotension, lactic acidosis, and cardiac arrest. The mitochondria play a central role in cellular metabolism where oxygen consumption through the electron transport system is tightly coupled to ATP production and regulated by metabolic demands...
March 13, 2018: Journal of Medical Toxicology: Official Journal of the American College of Medical Toxicology
Elvera Overdevest, Jeroen A Wouters, Kevin H M Wolfs, Job J M van Leeuwen, Sam Possemiers
Previous studies have shown that polyphenol supplementation may be an effective strategy to improve exercise performance, due to their antioxidant character and ability to stimulate NO production. These properties may contribute to exercise performance, yet no conclusive research has been performed in exploring the direct effects of citrus flavonoids on human exercise performance. Therefore, the purpose of this study was to assess whether supplementation of a customized citrus flavonoid (CF) extract for 4 weeks improves cycling time-trial performance in trained male athletes...
March 2018: Journal of Sports Science & Medicine
Min Seok Oh, Soo Jin Cho, Jidong Sung, Kyung Pyo Hong
An exaggerated blood pressure response during an exercise test reflects a future risk of hypertension and is related to increased left ventricular mass (LVM) in hypertensive patients. However, whether this relationship exists in normotensive subjects is not known. We enrolled 7923 health normotensive screening volunteers. Systolic blood pressure (SBP) at stage 1 of the exercise test was used as an indicator of the exercise BP response. Two-dimensional echocardiography was used to obtain the LVM index. Exercise SBP was significantly correlated with the LVM index (r = 0...
March 13, 2018: Hypertension Research: Official Journal of the Japanese Society of Hypertension
Nariaki Asada
Kidneys are physiologically hypoxic due to huge oxygen consumption for tubular reabsorption. The physiological hypoxia makes the kidney an appropriate organ for sensitively detecting oxygen levels and producing erythropoietin (EPO). In preterm neonates, immature kidneys cannot produce sufficient EPO, which results in anemia of prematurity (AOP). The cause of EPO insufficiency in AOP has been unclear, therefore current therapeutic options are transfusion and injection of recombinant human EPO. This report shows that the cause of insufficient EPO production in AOP is elevated renal oxygen levels due to poor oxygen consumption by immature tubules...
March 13, 2018: Scientific Reports
A C Van Erp, R A Rebolledo, D Hoeksma, N R Jespersen, P J Ottens, R Nørregaard, M Pedersen, C Laustsen, J G M Burgerhof, J C Wolters, J Ciapaite, H E Bøtker, H G D Leuvenink, B Jespersen
Hepatic and renal energy status prior to transplantation correlates with graft survival. However, effects of brain death (BD) on organ-specific energy status are largely unknown. We studied metabolism, perfusion, oxygen consumption, and mitochondrial function in the liver and kidneys following BD. BD was induced in mechanically-ventilated rats, inflating an epidurally-placed Fogarty-catheter, with sham-operated rats as controls. A 9.4T-preclinical MRI system measured hourly oxygen availability (BOLD-related R2*) and perfusion (T1-weighted)...
March 13, 2018: Scientific Reports
José V Subiela, Sonia H Torres, Juan B De Sanctis, Noelina Hernández
There is evidence that myocardial infarction (MI) patients have an inflammatory process that includes skeletal muscles, and exercise has been reported to reduce some inflammatory markers. The aim of this work was to study NO and some inflammatory markers in quadriceps muscle of MI patients before and after cardiac rehabilitation. Muscle biopsy was obtained in17 MI patients before and after CR and only once in 11 healthy subjects. Several cardiorespiratory and metabolic parameters were evaluated and skeletal muscle levels of nitric oxide synthases, nitrate, nitrite, nitrotyrosine, tumor necrosis factor alpha (TNF-α), transforming growth factor beta (TGF-β), interleukin- 6 (IL-6) and CD154...
March 10, 2018: Nitric Oxide: Biology and Chemistry
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