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https://www.readbyqxmd.com/read/28628977/enhanced-performance-of-microbial-fuel-cell-with-in-situ-preparing-dual-graphene-modified-bioelectrode
#1
Junfeng Chen, Yongyou Hu, Xiaojun Tan, Lihua Zhang, Wantang Huang, Jian Sun
This study proposed a three-step method to prepare dual graphene modified bioelectrode (D-GM-BE) by in situ microbial-induced reduction of GO and polarity reversion in microbial fuel cell (MFC). Both graphene modified bioanode (GM-BA) and biocathode (GM-BC) were of 3D graphene/biofilm architectures; the viability and thickness of microbial biofilm decreased compared with control bioelectrode (C-BE). The coulombic efficiency (CE) of GM-BA was 2.1 times of the control bioanode (C-BA), which demonstrated higher rate of substrates oxidation; the relationship between peak current and scan rates data meant that GM-BC was of higher efficiency of catalyzing oxygen reduction than the control biocathode (C-BC)...
June 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28616968/crispri-srna-transcriptional-translational-regulation-of-extracellular-electron-transfer-in-shewanella-oneidensis
#2
Yingxiu Cao, Xiaofei Li, Feng Li, Hao Song
Extracellular electron transfer (EET) in Shewanella oneidensis MR-1, which is one of the most well-studied exoelectrogens, underlies many microbial electrocatalysis processes, including microbial fuel cells, microbial electrolysis cells, and microbial electrosynthesis. However, regulating the efficiency of EET remains challenging due to the lack of efficient genome regulation tools that regulate gene expression levels in S. oneidensis. Here, we systematically established a transcriptional regulation technology, i...
June 15, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28616567/cyp2c19-variants-and-epoxyeicosatrienoic-acids-in-patients-with-microvascular-angina
#3
Tomonori Akasaka, Daisuke Sueta, Yuichiro Arima, Noriaki Tabata, Seiji Takashio, Yasuhiro Izumiya, Eiichiro Yamamoto, Kenichi Tsujita, Sunao Kojima, Koichi Kaikita, Ayami Kajiwara, Kazunori Morita, Kentaro Oniki, Junji Saruwatari, Kazuko Nakagawa, Seiji Hokimoto
BACKGROUND: Categorization as a cytochrome P450 (CYP) 2C19 poor metabolizer (PM) is reported to be an independent risk factor for cardiovascular disease. Epoxyeicosatrienoic acids (EETs) are metabolites of arachidonic acid by CYP2C19 epoxygenases and anti-inflammatory properties, especially in microvascular tissues. We examined the impact of CYP2C19 polymorphisms and EETs on the patients with microvascular angina (MVA) caused by coronary microvascular dysfunction. METHODS AND RESULTS: We examined CYP2C19 genotypes in patients with MVA (n = 81)...
June 2017: IJC Heart & Vasculature
https://www.readbyqxmd.com/read/28608645/proton-transport-in-the-outer-membrane-flavocytochrome-complex-limits-the-rate-of-extracellular-electron-transport
#4
Akihiro Okamoto, Yoshihide Tokunou, Kalathil Shafeer, Kazuhito Hashimoto
The microbial transfer of electrons to extracellularly located solid compounds, termed extracellular electron transport (EET), is critical for microbial electrode catalysis. Although the components of the EET pathway in the outer membrane (OM) have been identified, the role of electron/cation coupling in EET kinetics is poorly understood. For this report, we studied the dynamics of proton transport associated with EET in an OM flavocytochrome complex in Shewanella oneidensis MR-1. Using a whole-cell electrochemical assay, a significant kinetic isotope effect (KIE) was observed following the addition of deuterated water (D2O)...
June 13, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28588417/photosynthetic-pigment-protein-complexes-as-highly-connected-networks-implications-for-robust-energy-transport
#5
REVIEW
Lewis A Baker, Scott Habershon
Photosynthetic pigment-protein complexes (PPCs) are a vital component of the light-harvesting machinery of all plants and photosynthesizing bacteria, enabling efficient transport of the energy of absorbed light towards the reaction centre, where chemical energy storage is initiated. PPCs comprise a set of chromophore molecules, typically bacteriochlorophyll species, held in a well-defined arrangement by a protein scaffold; this relatively rigid distribution leads to a viewpoint in which the chromophore subsystem is treated as a network, where chromophores represent vertices and inter-chromophore electronic couplings represent edges...
May 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28587983/ophiopogonin-d-and-eets-ameliorate-ang-ii-induced-inflammatory-responses-via-activating-ppar%C3%AE-in-huvecs
#6
Xiaoyan Huang, Yuguang Wang, Zhaoyan Zhang, Yuan Wang, Xiangmei Chen, Yi Wang, Yue Gao
CYP2J2 is highly expressed in cardiovascular tissue including the heart and vascular endothelial cells. CYP2J2 and the EETs have been shown owning diverse biological effects. Our previous study found that ophiopogonin D (OP-D) suppressed drug-induced endoplasmic reticulum (ER) stress by upregulating the levels of CYP2J3/EETs in cardiomyocytes. The aim of this research was to investigate whether CYP2J2/EETs-PPARα pathway involved in endothelium protective effects of OP-D in human umbilical vein endothelial cells (HUVECs)...
June 3, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28576832/eet-intervention-on-wnt1-nov-and-ho-1-signaling-prevents-obesity-induced-cardiomyopathy-in-obese-mice
#7
Jian Cao, Shailendra P Singh, John McClung, Gregory Joseph, Luca Vanella, Ignazio Barbagallo, Houli Jiang, John R Falck, Michael Arad, Joseph I Shapiro, Nader G Abraham
We have previously reported that epoxyeicosatrienoic acid (EET) has multiple beneficial effects on vascular function, in addition to its anti-apoptotic action, it increases insulin sensitivity and inhibits inflammation. To uncover the signaling mechanisms by which EET reduces cardiomyopathy, we hypothesized that EET infusion might ameliorate obesity-induced cardiomyopathy by improving HO-1, Wnt1, thermogenic gene levels and mitochondrial integrity in cardiac tissues and improved pericardial fat phenotype. EET reduced levels of fasting blood glucose, and pro-inflammatory adipokines including NOV signaling while increasing echocardiographic fractional shortening and O2 consumption...
June 2, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28573176/recurrence-of-intestinal-metaplasia-and-early-neoplasia-after-endoscopic-eradication-therapy-for-barrett-s-esophagus-a-systematic-review-and-meta-analysis
#8
Larissa L Fujii-Lau, Birtukan Cinnor, Nicholas Shaheen, Srinivas Gaddam, Srinadh Komanduri, V Raman Muthusamy, Ananya Das, Robert Wilson, Violette C Simon, Vladimir Kushnir, Daniel Mullady, Steven A Edmundowicz, Dayna S Early, Sachin Wani
BACKGROUND:  Conflicting data exist with regard to recurrence rates of intestinal metaplasia (IM) and dysplasia after achieving complete eradication of intestinal metaplasia (CE-IM) in Barrett's esophagus (BE) patients. AIM:  (i) To determine the incidence of recurrent IM and dysplasia achieving CE-IM and (ii) to compare recurrence rates between treatment modalities [radiofrequency ablation (RFA) with or without endoscopic mucosal resection (EMR) vs stepwise complete EMR (SRER)]...
June 2017: Endoscopy International Open
https://www.readbyqxmd.com/read/28565913/outer-membrane-cytochromes-flavin-interactions-in-shewanella-spp-a-molecular-perspective
#9
Sofia Babanova, Ivana Matanovic, Jose Cornejo, Orianna Bretschger, Kenneth Nealson, Plamen Atanassov
Extracellular electron transfer (EET) is intrinsically associated with the core phenomena of energy harvesting/energy conversion in natural ecosystems and biotechnology applications. However, the mechanisms associated with EET are complex and involve molecular interactions that take place at the "bionano interface" where biotic/abiotic interactions are usually explored. This work provides molecular perspective on the electron transfer mechanism(s) employed by Shewanella oneidensis MR-1. Molecular docking simulations were used to explain the interfacial relationships between two outer-membrane cytochromes (OMC) OmcA and MtrC and riboflavin (RF) and flavin mononucleotide (FMN), respectively...
May 31, 2017: Biointerphases
https://www.readbyqxmd.com/read/28554983/cyp2j2-metabolites-epoxyeicosatrienoic-acids-attenuate-angii-induced-cardiac-fibrotic-response-by-targeting-g%C3%AE-12-13
#10
Zuowen He, Yong Yang, Zheng Wen, Chen Chen, Xizhen Xu, Yanfang Zhu, Yan Wang, Dao Wen Wang
Arachidonic acid-cytochrome P450 2J2-epoxyeicosatrienoic acids (AA-CYP2J2-EETs) metabolic pathway has been identified protective in cardiovascular system. This study explored effects of AA-CYP2J2-EETs metabolic pathway on cardiac fibrosis from perspective of cardiac fibroblast and underlying mechanisms. In vivo studies, eight-week-old male CYP2J2 transgenic mice (aMHC-CYP2J2-Tr) and littermates were infused with angiotensin II (Ang II) or saline for 2 weeks. Results showed that CYP2J2 overexpression increased EETs production...
May 29, 2017: Journal of Lipid Research
https://www.readbyqxmd.com/read/28551025/cytochrome-p450-derived-eicosanoids-and-heart-function
#11
REVIEW
K Lockhart Jamieson, Tomoko Endo, Ahmed M Darwesh, Victor Samokhvalov, John M Seubert
The cytochrome P450 monooxygenase system (CYP) is a multigene superfamily of enzymes, which are important in the metabolism foreign and endogenous compounds. CYP isoforms metabolize a number of n-3 and n-6 polyunsaturated fatty acids (PUFA), including linoleic acid (18:2n6, LA), arachidonic acid (20:4n6, AA), ecosapentaenoic acid (20:5n3, EPA) and docosahexaenoic acid (22:6n3, DHA) into bioactive lipid mediators, termed eicosanoids. CYP-derived eicosanoids have numerous effects toward physiological and pathophysiological events within the body, which depends on the type, quantity and timing of metabolites produced...
May 24, 2017: Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28541099/cost-effectiveness-analysis-of-endoscopic-eradication-therapy-for-treatment-of-high-grade-dysplasia-in-barrett-s-esophagus
#12
Alex Filby, Matthew Taylor, Gideon Lipman, Laurence Lovat, Rehan Haidry
AIM: The aim was to evaluate the cost-effectiveness of endoscopic eradication therapy (EET) with combined endoscopic mucosal resection and radiofrequency ablation for the treatment of high-grade dysplasia (HGD) arising in patients with Barrett's esophagus compared with endoscopic surveillance alone in the UK. MATERIALS & METHODS: The cost-effectiveness model consisted of a decision tree and modified Markov model. A lifetime time horizon was adopted with the perspective of the UK healthcare system...
May 25, 2017: Journal of Comparative Effectiveness Research
https://www.readbyqxmd.com/read/28526610/11-12-epoxyeicosatrienoic-acid-11-12-eet-reduces-excitability-and-excitatory-transmission-in-the-hippocampus
#13
Nandkishor K Mule, Anette C Orjuela Leon, John R Falck, Michael Arand, Anne Marowsky
Recent studies suggest a role for the arachidonic acid-derived epoxyeicosatrienoic acids (EETs) in attenuating epileptic seizures. However, their effect on neurotransmission has never been investigated in detail. Here, we studied how 11,12- and 14,15 EET affect excitability and excitatory neurotransmission in mouse hippocampus. 11,12 EET (2 μM), but not 14,15 EET (2 μM), induced the opening of a hyperpolarizing K(+) conductance in CA1 pyramidal cells. This action could be blocked by BaCl2, the G protein blocker GDPβ-S and the GIRK1/4 blocker tertiapin Q and the channel was thus identified as a GIRK channel...
May 17, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28515648/evaluation-of-antioxidative-activity-of-various-levels-of-ethanol-extracted-tomato-powder-and-application-to-pork-patties
#14
Hyeong Sang Kim, Koo Bok Chin
This study was performed to evaluate antioxidant activity of tomato powder extracted by various concentrations of ethanol (0, 25, 50, 75, 100%) and to evaluate the physicochemical properties and antioxidant activities of pork patties with ethanol extracted tomato (EET) powder. No differences in the contents of total of individual phenolic compounds including gallic acid and catechin, were observed among the treatments (p>0.05). Among the various concentrations, 50% and 75% EET powder showed the highest free radical scavenging and iron chelating activities (p<0...
2017: Korean Journal for Food Science of Animal Resources
https://www.readbyqxmd.com/read/28508993/14-15-eet-suppresses-neuronal-apoptosis-in-ischemia-reperfusion-through-the-mitochondrial-pathway
#15
Hui-Xia Geng, Rui-Ping Li, Ying-Ge Li, Xiao-Qing Wang, Li Zhang, Jin-Bo Deng, Lai Wang, Jie-Xin Deng
Neuronal apoptosis mediated by the mitochondrial apoptosis pathway is an important pathological process in cerebral ischemia-reperfusion injury. 14,15-EET, an intermediate metabolite of arachidonic acid, can promote cell survival during ischemia/reperfusion. However, whether the mitochondrial apoptotic pathway is involved this survival mechanism is not fully understood. In this study, we observed that infarct size in ischemia-reperfusion injury was reduced in sEH gene knockout mice. In addition, Caspase 3 activation, cytochrome C release and AIF nuclear translocation were also inhibited...
May 16, 2017: Neurochemical Research
https://www.readbyqxmd.com/read/28497947/energy-transfer-kinetics-in-photosynthesis-as-an-inspiration-for-improving-organic-solar-cells
#16
Collins Nganou, Gerhard Lackner, Bezu Teschome, M Jamal Deen, Noam Adir, David Pouhe, Doru C Lupascu, Martin Mkandawire
Clues to designing highly efficient organic solar cells may lie in understanding the architecture of light-harvesting systems and exciton energy transfer (EET) processes in very efficient photosynthetic organisms. Here, we compare the kinetics of excitation energy tunnelling from the intact phycobilisome (PBS) light-harvesting antenna system to the reaction center in photosystem II in intact cells of the cyanobacterium Acaryochloris marina with the charge transfer after conversion of photons into photocurrent in vertically aligned carbon nanotube (va-CNT) organic solar cells with poly(3-hexyl)thiophene (P3HT) as the pigment...
June 7, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28488585/eets-reduces-lps-induced-hyperpermeability-by-targeting-grp78-mediated-src-activation-and-subsequent-rho-rock-signaling-pathway
#17
Ruolan Dong, Danli Hu, Yan Yang, Zhihui Chen, Menglu Fu, Dao Wen Wang, Xizhen Xu, Ling Tu
Integrity of endothelial barrier is a determinant of the prognosis in the acute lung injury caused by sepsis. The epoxyeicosatrienoic acids (EETs), metabolites of arachidonic acid, exhibit protective effects in various pathogenic states, however, whether EETs play a role in endothelial barrier enhancement and the involved mechanisms remain to be investigated. Here, we show that increased EETs level by endothelial specific cytochrome P450 epoxygenase 2J2 over-expression and soluble epoxide hydrolase (sEH) inhibitor TPPU reduced lipopolysaccharide-induced endothelial hyper-permeability in vivo, accompanied by improved survival of septic mice...
April 21, 2017: Oncotarget
https://www.readbyqxmd.com/read/28473204/inhibition-of-soluble-epoxide-hydrolase-reduces-portal-pressure-by-protecting-mesenteric-artery-myogenic-responses-in-cirrhotic-rats
#18
Yijun Huang, Jun Qin, Dong Sun, Houli Jiang, Lei Zheng, Yue He, Liang Gui, Binbin Qian, Chihao Zhang, Meng Luo
Hyperdynamic circulation contributes to the progress of portal hypertension in liver cirrhosis. We investigated the effects of soluble epoxide hydrolase (sEH) inhibition on portal pressure and the myogenic response of mesenteric arteries isolated from cirrhotic rats using the sEH inhibitor t-TUCB (trans-4-{4-[3-(4-trifluoromethoxyphenyl)-ureido]cyclohexyloxy}benzoic acid). Cirrhotic tissues had a higher ratio of epoxyeicosatrienoic acids (EETs) to dihydroxyeicosatrienoic acids (DHETs) following increased CYP2C11 expression, which may be a protective response...
May 1, 2017: Prostaglandins & Other Lipid Mediators
https://www.readbyqxmd.com/read/28470279/synthesis-of-cyclooxygenase-metabolites-of-8-9-epoxyeicosatrienoic-acid-eet-11-and-15-hydroxy-8-9-eets
#19
Bogdan Barnych, Amy A Rand, Tomas Cajka, Kin Sing Stephen Lee, Bruce D Hammock
COX metabolites of 8,9-EET, previously observed as potent mitogenic lipid mediators, were synthesized for the first time by using two synthetic approaches. These synthetic materials allow for structural confirmation of COX metabolites of 8,9-EET and further study of their biological roles.
May 23, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28454544/attenuation-of-acute-lung-injury-in-a-rat-model-by-semen-cassiae
#20
Xiuqing Chen, Xianming Zhang, Jie Zhang, Yang Gao, Zhaohui Yang, Shanshan Li, Haiwen Dai
BACKGROUND: Acute lung injury (ALI) is an inflammatory disorder. Semen Cassiae has potent anti-inflammatory activities. The aim of our study was to investigate whether Semen Cassiae plays a protective effect on lipopolysaccharide (LPS)-induced ALI and, if so, to elucidate its potential mechanism. METHODS: Male Sprague-Dawley rat lungs were injured by intratracheal instillation of LPS. Rats were treated with Semen Cassiae or vehicle 3 h after LPS challenge. Samples were harvested 24 h post-LPS administration...
April 28, 2017: BMC Complementary and Alternative Medicine
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