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https://www.readbyqxmd.com/read/28527485/delayed-onset-striatal-hands-following-basal-ganglia-anoxic-insult
#1
Sandra Sousa, Fernando Pita
No abstract text is available yet for this article.
February 27, 2017: Acta Médica Portuguesa
https://www.readbyqxmd.com/read/28521819/linking-hypoxia-dna-damage-and-proliferation-in-multicellular-tumor-spheroids
#2
Stephen Riffle, Ram Naresh Pandey, Morgan Albert, Rashmi S Hegde
BACKGROUND: Multicellular Tumor Spheroids are frequently used to mimic the regionalization of proliferation and the hypoxic environment within avascular tumors. Here we exploit these features to study the activation of DNA damage repair pathways and their correlation to developing hypoxia. METHODS: Activation of DNA damage repair markers, proliferation, cell death, glycogen accumulation and developing hypoxia were investigated using immunofluorescence, immuno-histochemistry, EdU incorporation, Western blots, COMET assays, and pharmacological agents in A673 Ewing sarcoma spheroids and monolayer cultures...
May 18, 2017: BMC Cancer
https://www.readbyqxmd.com/read/28521237/pilot-plant-demonstration-of-stable-and-efficient-high-rate-biological-nutrient-removal-with-low-dissolved-oxygen-conditions
#3
Natalie A Keene, Steve R Reusser, Matthew J Scarborough, Alan L Grooms, Matt Seib, Jorge Santo Domingo, Daniel R Noguera
Aeration in biological nutrient removal (BNR) processes accounts for nearly half of the total electricity costs at many wastewater treatment plants. Even though conventional BNR processes are usually operated to have aerated zones with high dissolved oxygen (DO) concentrations, recent research has shown that nitrification can be maintained using very low-DO concentrations (e.g., below 0.2 mg O2/L), and therefore, it may be possible to reduce energy use and costs in BNR facilities by decreasing aeration. However, the effect of reduced aeration on enhanced biological phosphorus removal (EBPR) is not understood...
May 13, 2017: Water Research
https://www.readbyqxmd.com/read/28521206/decontamination-of-multiple-heavy-metals-containing-effluents-through-microbial-biotechnology
#4
Minxi Wu, Jingjing Liang, Jie Tang, Guang Li, Shiping Shan, Zhaohui Guo, Le Deng
To decontaminate heavy metal-containing waste water, a microbial biotechnology was developed by using the synergy between Sulfate reducing bacteria (SRB), Bacillus cereus (B. cereus) and Camellia oleifera cake (COC). In this process the COC degradation assisted by B.cereus, created an anoxic environment and provided energy and nutrition for SRB. Both of B. cereus and SRB played significant roles through biosorption, bioaccumulation and biosurfactant production. Meanwhile, a flotation technology commonly used in many effluent treatments has been led into this system for increasing the efficiency as well...
May 5, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28507540/microbial-population-dynamics-and-ecosystem-functions-of-anoxic-aerobic-granular-sludge-in-sequencing-batch-reactors-operated-at-different-organic-loading-rates
#5
Enikö Szabó, Raquel Liébana, Malte Hermansson, Oskar Modin, Frank Persson, Britt-Marie Wilén
The granular sludge process is an effective, low-footprint alternative to conventional activated sludge wastewater treatment. The architecture of the microbial granules allows the co-existence of different functional groups, e.g., nitrifying and denitrifying communities, which permits compact reactor design. However, little is known about the factors influencing community assembly in granular sludge, such as the effects of reactor operation strategies and influent wastewater composition. Here, we analyze the development of the microbiomes in parallel laboratory-scale anoxic/aerobic granular sludge reactors operated at low (0...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28507069/saers-is-responsive-to-cellular-respiratory-status-and-regulates-fermentative-biofilm-formation-in-staphylococcus-aureus
#6
Ameya A Mashruwala, Casey M Gries, Tyler D Scherr, Tammy Kielian, Jeffrey M Boyd
Biofilms are multicellular communities of microorganisms living as a quorum rather than as individual cells. The bacterial human pathogen Staphylococcus aureus uses oxygen as a terminal electron acceptor during respiration. Infected human tissues are hypoxic or anoxic. We recently reported that impaired respiration elicits a programmed cell lysis (PCL) phenomenon in S. aureus leading to the release of cellular polymers that are utilized to form biofilms. PCL is dependent upon the AtlA murein hydrolase and is regulated, in part, by the SrrAB two-component regulatory system (TCRS)...
May 15, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28497927/the-potential-role-of-pain-related-sseps-in-the-early-prognostication-of-long-term-functional-outcome-in-post-anoxic-coma
#7
Alessandra Del Felice, Stefano Bargellesi, Federico Linassi, Bruno Scarpa, Emanuela Formaggio, Paolo Boldrini, Stefano Masiero, Paolo Zanatta
BACKGROUND: Cardiac arrest (CA) is a common cause of disability. Multimodal evaluation has improved prognosis but precocious biomarkers are not appropriate in determining long-term functional outcome. AIM: to identify early prognostication markers of long-term functional outcome in post-anoxic coma. DESIGN: retrospective assessment of outcomes. POPULATION: Individuals older than 18 years with post-anoxic coma hospitalized in intensive care units after cardiac arrest (CA) regardless of cause (cardiac or non-cardiac) and location of event (in or out-of-hospital)...
May 12, 2017: European Journal of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/28497785/charcoal-evidence-that-rising-atmospheric-oxygen-terminated-early-jurassic-ocean-anoxia
#8
Sarah J Baker, Stephen P Hesselbo, Timothy M Lenton, Luís V Duarte, Claire M Belcher
The Toarcian Oceanic Anoxic Event (T-OAE) was characterized by a major disturbance to the global carbon(C)-cycle, and depleted oxygen in Earth's oceans resulting in marine mass extinction. Numerical models predict that increased organic carbon burial should drive a rise in atmospheric oxygen (pO2) leading to termination of an OAE after ∼1 Myr. Wildfire is highly responsive to changes in pO2 implying that fire-activity should vary across OAEs. Here we test this hypothesis by tracing variations in the abundance of fossil charcoal across the T-OAE...
May 12, 2017: Nature Communications
https://www.readbyqxmd.com/read/28497496/percutaneous-left-atrial-decompression-in-adults-with-refractory-cardiogenic-shock-supported-with-veno-arterial-extracorporeal-membrane-oxygenation
#9
Mosaad Alhussein, Mark Osten, Eric Horlick, Heather Ross, Eddy Fan, Vivek Rao, Filio Billia
BACKGROUND AND AIM OF THE STUDY: Left ventricular (LV) distention, a recognized complication in patients supported with veno-arterial extracorporeal membrane oxygenation (VA-ECMO) for refractory cardiogenic shock, can lead to pulmonary edema, increased myocardial oxygen consumption, and LV thrombus formation. Atrial septostomy was examined as a management strategy for LV distension. METHODS: Of 72 patients supported with VA-ECMO, seven patients underwent atrial septostomy through a trans-septal approach...
May 11, 2017: Journal of Cardiac Surgery
https://www.readbyqxmd.com/read/28494300/behaviour-of-the-main-nonsteroidal-anti-inflammatory-drugs-in-a-membrane-bioreactor-treating-urban-wastewater-at-high-hydraulic-and-sludge-retention-time
#10
D M González-Pérez, J I Pérez, M A Gómez
The behaviour and removal efficiency of ibuprofen (IBU), diclofenac (DCF), ketoprofen (KPF), and naproxen (NPX) during the real urban wastewater treatment by an experimental full-scale MBR working at high sludge and hydraulic retention time (SRT, HRT) were determined. The MBR worked in denitrification/nitrification conformation at 35.4h of HRT (Q=0.45m(3)/h), 37 d of SRT and a recirculation flow rate of 4Q. The experiments were made under steady-state conditions, reaching a biodegradable organic matter removal higher than 99...
April 26, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28493994/spatiotemporal-analysis-of-microbial-community-dynamics-during-seasonal-stratification-events-in-a-freshwater-lake-grand-lake-ok-usa
#11
Jessica M Morrison, Kristina D Baker, Richard M Zamor, Steve Nikolai, Mostafa S Elshahed, Noha H Youssef
Many freshwater lakes undergo seasonal stratification, where the formation of phototrophic blooms in the epilimnion and subsequent sedimentation induces hypoxia/anoxia in the thermocline and hypolimnion. This autochthonously produced biomass represents a major seasonal organic input that impacts the entire ecosystem. While the limnological aspects of this process are fairly well documented, relatively little is known regarding the microbial community response to such events, especially in the deeper anoxic layers of the water column...
2017: PloS One
https://www.readbyqxmd.com/read/28493077/lung-protective-effects-of-low-volume-resuscitation-and-pharmacologic-treatment-of-swine-subjected-to-polytrauma-and-hemorrhagic-shock
#12
Vahagn C Nikolian, Baihong Pan, Tomaz Mesar, Isabel S Dennahy, Patrick E Georgoff, Xiuzhen Duan, Baoling Liu, Xizi Wu, Michael J Duggan, Hasan B Alam, Yongqing Li
Hemorrhage is a common cause of death in the battlefield. Valproic acid (VPA) has been associated with improved outcomes in multiple models of trauma, when combined with isotonic fluid resuscitation. However, isotonic fluid administered in this setting is logistically impractical and may be associated with complications. In this study, we sought to evaluate the feasibility and immunologic impact of combining VPA treatment with low-volume hypertonic saline (HTS). In vivo: female Yorkshire swine were subjected to hemorrhage (40% total blood volume) and polytrauma (rib fracture and delayed liver injury)...
May 10, 2017: Inflammation
https://www.readbyqxmd.com/read/28492316/environmentally-persistent-free-radicals-in-soils-of-past-coking-sites-distribution-and-stabilization
#13
Hanzhong Jia, Song Zhao, Gulimire Nulaji, Kelin Tao, Fu Wang, Virender K Sharma, Chuanyi Wang
This study presents the existence of environmentally persistent free radicals (EPFRs) in soils of past coking sites, mainly contaminated by polycyclic aromatic hydrocarbons (PAHs). Measurements of EPFRs were conducted by electron paramagnetic resonance (EPR) technique with numerous soil samples, which were collected from different distances (0-1000 m) and different depths (0-30 cm) of three contaminant sources. EPR signals with ~ 3×1017 radicals/g of the soil samples were obtained, which are very similar to that generated in PAHs contaminated clays, i...
May 11, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28489281/unveiling-microbial-interactions-in-stratified-mat-communities-from-a-warm-saline-shallow-pond
#14
Aurélien Saghaï, Ana Gutiérrez-Preciado, Philippe Deschamps, David Moreira, Paola Bertolino, Marie Ragon, Purificación López-García
Modern phototrophic microbial mats are complex communities often used as analogs of major Precambrian ecosystems. Characterizing biotic, notably metabolic, interactions among different microbial mat members is essential to gain insights into the ecology and biogeochemistry of these systems. We applied 16S/18S rRNA metabarcoding approaches to characterize the structure of archaea, bacteria and protist communities from microbial mats collected along strong physicochemical (oxygen, salinity, temperature, depth) gradients in a shallow pond at the salar de Llamara (Chile)...
May 10, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28487684/relative-abundance-and-diversity-of-bacterial-methanotrophs-at-the-oxic-anoxic-interface-of-the-congo-deep-sea-fan
#15
Sandrine Bessette, Yann Moalic, Sébastien Gautey, Françoise Lesongeur, Anne Godfroy, Laurent Toffin
Sitting at ∼5,000 m water depth on the Congo-Angola margin and ∼760 km offshore of the West African coast, the recent lobe complex of the Congo deep-sea fan receives large amounts of fluvial sediments (3-5% organic carbon). This organic-rich sedimentation area harbors habitats with chemosynthetic communities similar to those of cold seeps. In this study, we investigated relative abundance, diversity and distribution of aerobic methane-oxidizing bacteria (MOB) communities at the oxic-anoxic interface of sedimentary habitats by using fluorescence in situ hybridization and comparative sequence analysis of particulate mono-oxygenase (pmoA) genes...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28486166/cooperation-between-candidatus-competibacter-and-candidatus-accumulibacter-clade-i-in-denitrification-and-phosphate-removal-processes
#16
F J Rubio-Rincón, C M Lopez-Vazquez, L Welles, M C M van Loosdrecht, D Brdjanovic
Although simultaneous P-removal and nitrate reduction has been observed in laboratory studies as well as full-scale plants, there are contradictory reports on the ability of PAO I to efficiently use nitrate as electron acceptor. Such discrepancy could be due to other microbial groups performing partial denitrification from nitrate to nitrite. The denitrification capacities of two different cultures, a highly enriched PAO I and a PAO I-GAO cultures were assessed through batch activity tests conducted before and after acclimatization to nitrate...
May 3, 2017: Water Research
https://www.readbyqxmd.com/read/28480139/dynamics-and-genetic-diversification-of-escherichia-coli-during-experimental-adaptation-to-an-anaerobic-environment
#17
Thomas J Finn, Sonal Shewaramani, Sinead C Leahy, Peter H Janssen, Christina D Moon
BACKGROUND: Many bacteria are facultative anaerobes, and can proliferate in both anoxic and oxic environments. Under anaerobic conditions, fermentation is the primary means of energy generation in contrast to respiration. Furthermore, the rates and spectra of spontaneous mutations that arise during anaerobic growth differ to those under aerobic growth. A long-term selection experiment was undertaken to investigate the genetic changes that underpin how the facultative anaerobe, Escherichia coli, adapts to anaerobic environments...
2017: PeerJ
https://www.readbyqxmd.com/read/28479919/nasogastric-tube-feeding-induced-esophageal-bezoar-case-description
#18
Jad A Degheili, Mikhael G Sebaaly, Ali H Hallal
Background. Bezoars are well established entities causing gastrointestinal obstructions. Depending on the prominent constituent of these bezoars, the latter are divided into four subtypes: pharmacobezoars, lactobezoars, trichobezoars, and phytobezoars. Less frequently reported types of bezoars are reported including those formed secondary to nasogastric tube feeding with casein-based formulas. Case Presentation. A 69-year-old male presented following cardiac arrest postmyocardial infarction. Patient sustained anoxic brain injury after resuscitation, rendering him ventilator dependant along with nasogastric tube feeding, initially...
2017: Case Reports in Medicine
https://www.readbyqxmd.com/read/28474482/co2-assimilation-strategies-in-stratified-lakes-diversity-and-distribution-patterns-of-chemolithoautotrophs
#19
Albin Alfreider, Andreas Baumer, Teresa Bogensperger, Thomas Posch, Michaela M Salcher, Monika Summerer
While mechanisms of different carbon dioxide (CO2 ) assimilation pathways in chemolithoautotrohic prokaryotes are well understood for many isolates under laboratory conditions, the ecological significance of diverse CO2 fixation strategies in the environment is mostly unexplored. Six stratified freshwater lakes were chosen to study the distribution and diversity of the Calvin-Benson-Bassham (CBB) cycle, the reductive tricarboxylic acid (rTCA) cycle, and the recently discovered archaeal 3-hydroxypropionate/4-hydroxybutyrate (HP/HB) pathway...
May 4, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28473821/boosted-membrane-potential-as-bioenergetic-response-to-anoxia-in-dinoroseobacter-shibae
#20
Christian Kirchhoff, Heribert Cypionka
Dinoroseobacter shibae DFL 12(T) is a metabolically versatile member of the world-wide abundant Roseobacter clade. As an epibiont of dinoflagellates D. shibae is subjected to rigorous changes in oxygen availability. It has been shown that it loses up to 90% of its intracellular ATP when exposed to anoxic conditions. Yet, D. shibae regenerates its ATP level quickly when oxygen becomes available again. In the present study we focused on the bioenergetic aspects of the quick recovery and hypothesized that the proton-motive force decreases during anoxia and gets restored upon re-aeration...
2017: Frontiers in Microbiology
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