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https://www.readbyqxmd.com/read/28110139/boosting-current-generation-in-microbial-fuel-cells-by-an-order-of-magnitude-by-coating-an-ionic-liquid-polymer-on-carbon-anodes
#1
Lu Yang, Wenfang Deng, Youming Zhang, Yueming Tan, Ming Ma, Qingji Xie
Microbial fuel cells (MFCs) have attracted great attentions due to their great application potentials, but the relatively low power densities of MFCs still hinder their widespread practical applications. Herein, we report that the current generation in MFCs can be boosted by an order of magnitude, simply by coating a hydrophilic and positively charged ionic liquid polymer (ILP) on carbon cloth (CC) or carbon felt (CF). The ILP coating not only can increase the bacterial loading capacity due to the electrostatic interactions between ILP and bacterial cells, but also can improve the mediated extracellular electron transfer between the electrode and the cytochrome proteins on the outer membrane of Shewanella putrefaciens cells...
January 14, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28110059/tuning-dna-adsorption-affinity-and-density-on-metal-oxide-and-phosphate-for-improved-arsenate-detection
#2
Anand Lopez, Yifei Zhang, Juewen Liu
Arsenic (As) contamination in groundwater presents a major health and environmental concern in developing countries. Typically, As is found in two oxidation states. Most chemical tests for inorganic arsenic are focused on As(III), and few have been developed for As(V). We are interested in developing biosensors for As(V) based on its similarity with phosphate. Building upon previous work involving DNA-capped Fe3O4 nanoparticles for As(V) detection, we investigated two other nanomaterials: CeO2 and CePO4 in terms of DNA adsorption and As(V) induced DNA desorption...
January 11, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28109965/a-novel-acidic-ph-fluorescent-probe-based-on-a-benzothiazole-derivative
#3
Qiujuan Ma, Xian Li, Suxiang Feng, Beibei Liang, Tiqiang Zhou, Min Xu, Zhuoyi Ma
A novel acidic pH fluorescent probe 1 based on a benzothiazole derivative has been designed, synthesized and developed. The linear response range covers the acidic pH range from 3.44 to 6.46, which is valuable for pH researches in acidic environment. The evaluated pKa value of the probe 1 is 4.23. The fluorescence enhancement of the studied probe 1 with an increase in hydrogen ions concentration is based on the hindering of enhanced photo-induced electron transfer (PET) process. Moreover, the pH sensor possesses a highly selective response to H(+) in the presence of metal ions, anions and other bioactive small molecules which would be interfere with its fluorescent pH response...
January 12, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28109420/improving-nutrition-by-increasing-supplemental-nutrition-assistance-program-benefits
#4
Ann M Collins, Jacob A Klerman
The diets of Americans fall far short of recommended dietary guidelines, and those who live in low-income households have even poorer diets than higher-income households. Many low-income Americans rely on the Supplemental Nutrition Assistance Program (SNAP). The program's dual goals are to improve food security and nutrition. Among the possible strategies to address dietary shortfalls among low-income Americans is to increase the SNAP benefit. This article uses data from the random assignment evaluation of the Summer Electronic Benefit Transfer for Children demonstration to add new insights on the impact of SNAP on diet quality for households receiving SNAP who also received SNAP-like benefits through Summer Electronic Benefit Transfer for Children...
February 2017: American Journal of Preventive Medicine
https://www.readbyqxmd.com/read/28109419/improving-nutrition-by-limiting-choice-in-the-supplemental-nutrition-assistance-program
#5
EDITORIAL
Jacob A Klerman, Ann M Collins, Lauren E W Olsho
In contrast to the Special Supplemental Nutrition Program for Women, Infants, and Children, the Supplemental Nutrition Assistance Program (SNAP) currently allows the purchase of almost any food. This paper reconsiders the role of two forms of limiting choice in SNAP. Using economic theory, descriptive analysis of survey data, and discussion of random assignment evaluation evidence from the Summer Electronic Benefit Transfer for Children Demonstration, the paper argues that because households can substitute cash for SNAP, banning the use of SNAP for less nutritionally desirable foods (e...
February 2017: American Journal of Preventive Medicine
https://www.readbyqxmd.com/read/28109411/the-challenge-in-improving-the-diets-of-supplemental-nutrition-assistance-program-recipients-a-historical-commentary
#6
EDITORIAL
Barry M Popkin
This paper provides a historical background for the current nutrition issues faced by the Supplemental Nutrition Assistance Program (SNAP). The Food Stamp Program evolved into SNAP during a period when U.S. diets, particularly those of the poor, became less healthful. During the 1960s, the U.S. (Kennedy-Johnson era) addressed malnutrition first with a pilot project focused on retail sales and cash food stamps, which showed that low-income consumers purchased relatively healthy foods for a fairly high-quality diet...
February 2017: American Journal of Preventive Medicine
https://www.readbyqxmd.com/read/28109235/the-impact-of-long-range-electron-hole-interaction-on-the-charge-separation-yield-of-molecular-photocells
#7
Tahereh Nemati Aram, Matthias Ernzerhof, Asghar Asgari, Didier Mayou
We discuss the effects of charge carrier interaction and recombination on the operation of molecular photocells. Molecular photocells are devices where the energy conversion process takes place in a single molecular donor-acceptor complex attached to electrodes. Our investigation is based on the quantum scattering theory, in particular on the Lippmann-Schwinger equation; this minimizes the complexity of the problem while providing useful and non-trivial insight into the mechanism governing photocell operation...
January 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28107979/electrochemical-sensing-platform-based-on-molecularly-imprinted-polymer-decorated-n-s-co-doped-activated-graphene-for-ultrasensitive-and-selective-determination-of-cyclophosphamide
#8
Bintong Huang, Lili Xiao, Haifeng Dong, Xueji Zhang, Wei Gan, Shahid Mahboob, Khalid Abdullah Al-Ghanim, Qunhui Yuan, Yingchun Li
A novel electrochemical sensor has been facilely fabricated by applying composite elements consisting of nitrogen and sulfur co-doped activated graphene (N,S-AGR) and molecularly imprinted polymer (MIP). N,S-AGR was synthesized by one-pot pyrogenation of a mixture of thiourea, KOH and graphene oxide, which was introduced to improve electron transfer capability and surface area of the electrode, while the electro-polymerized MIP layer afforded simultaneous recognition and quantification of cyclophosphamide (CPA) by utilizing Fe(CN)6(3-/4-) as probe to indicate electrical signals...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107972/electrochemical-sensor-for-sensitive-detection-of-triclosan-based-on-graphene-palladium-nanoparticles-hybrids
#9
Tingxuan Wu, Tingting Li, Zhiguang Liu, Yujing Guo, Chuan Dong
In this paper, poly (diallyldimethylammonium chloride) functionalized graphene/palladium nanoparticles (PDDA-Gr/PdNPs) have been successfully synthesized through a simple one-pot method with the use of PDDA as stabilizing agents. The electrochemical response of triclosan on the PDDA-Gr/PdNPs modified glassy carbon electrode (GCE) is greatly enhanced comparing to the PDDA-Gr/GCE or the bare GCE. It is suggested that the nanocomposite exhibited good electron transfer ability and catalytic activity. Under the optimal conditions, the oxidation current increased linearly with the concentration of triclosan in the range of 9...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107936/a-simple-and-sensitive-method-for-determination-of-taxifolin-on-palladium-nanoparticles-supported-poly-diallyldimethylammonium-chloride-functionalized-graphene-modified-electrode
#10
Qinqin Wang, Lu Wang, Gaiping Li, Baoxian Ye
Palladium nanoparticles with diameter of around 5-10nm supported on poly (diallyldimethylammonium chloride) (PDDA)-functionalized graphene composites were prepared by a simple chemical method. As-prepared nanocomposites were characterized by transmission electron microscopy (TEM), x-ray diffraction (XRD), ultraviolet-visible spectrophotometry (UV-vis) and electrochemical techniques, which were clearly demonstrated that palladium nanoparticles were uniformly dispersed on the graphene sheets. Based on the PDDA-Gr-Pd nanocomposites, a new voltammetric sensor was established and exhibited excellent electrocatalytic activity and fast electron transfer rate toward taxifolin...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107745/femtomolar-detection-of-cardiac-troponin-i-using-a-novel-label-free-and-reagent-free-dendrimer-enhanced-impedimetric-immunosensor
#11
Rashida Akter, Bongjin Jeong, Yong-Mi Lee, Jong-Soon Choi, Md Aminur Rahman
A novel highly sensitive dendrimer coupled impedimetric immunosensor was developed for the label-free and reagent-free detection of cardiac troponin I (TnI) in serum samples. The immunosensor probe was fabricated by covalently attaching carboxylic acid-functionalized third generation (G3) poly (amidoamine) (PAMAM) dendrimer (Den) on the 3, 3', 5, 5'-tetramethyl benzidine (TMB) modified 6-mercaptohexanoic acid (MHA) self-assembled monolayer (SAM) on a gold (Au) electrode. Monoclonal anti-TnI antibody was then covalently immobilized on the Den and TMB attached MHA SAM modified surface...
January 12, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28107348/predicting-length-of-stay-among-patients-discharged-from-the-emergency-department-using-an-accelerated-failure-time-model
#12
Chung-Hsien Chaou, Hsiu-Hsi Chen, Shu-Hui Chang, Petrus Tang, Shin-Liang Pan, Amy Ming-Fang Yen, Te-Fa Chiu
BACKGROUND: Emergency department (ED) crowding continues to be an important health care issue in modern countries. Among the many crucial quality indicators for monitoring the throughput process, a patient's length of stay (LOS) is considered the most important one since it is both the cause and the result of ED crowding. The aim of this study is to identify and quantify the influence of different patient-related or diagnostic activities-related factors on the ED LOS of discharged patients...
2017: PloS One
https://www.readbyqxmd.com/read/28107184/tunneling-nanotubes-promote-intercellular-mitochondria-transfer-followed-by-increased-invasiveness-in-bladder-cancer-cells
#13
Jinjin Lu, Xiufen Zheng, Fan Li, Yang Yu, Zhong Chen, Zheng Liu, Zhihua Wang, Hua Xu, Weimin Yang
Intercellular transfer of organelles via tunneling nanotubes (TNTs) is a novel means of cell-to-cell communication. Here we demonstrate the existence of TNTs between co-cultured RT4 and T24 bladder cancer cells using light microscopy, fluorescence imaging, and scanning electron microscopy (SEM). Spontaneous unidirectional transfer of mitochondria from T24 to RT4 cells was detected using fluorescence imaging and flow cytometry. The distribution of mitochondria migrated from T24 cells was in good agreement with the original mitochondria in RT4 cells, which may imply mitochondrial fusion...
January 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/28106900/vesicle-formation-by-proton-transfer-driven-short-tailed-fatty-acids-of-c4-c8-chain-length-in-water
#14
Li-Chun Chen, Hong-Peng Wang, Yu-Hao Deng, Shao-Ping Deng
Ultrashort single-chain fatty acids self-assemble to form vesicles under certain proton-driven conditions. The protonation provides a larger charge area around the hydrophilic carbonyl headgroups, and proton shift as the key driving parameter was studied. The ultrashort fatty acids (C4-C8) formed stable unilamellar vesicles predominantly through out the whole range of tested pH levels (6.5-9.5). A proton-driven self-assembly process and effects on the phase transition were characterized by dynamic light scattering, transmission electron microscopy and cryo-transmission electron microscopy...
January 20, 2017: Soft Matter
https://www.readbyqxmd.com/read/28106225/co-immobilization-of-glucose-oxidase-and-catalase-for-enhancing-the-performance-of-a-membraneless-glucose-biofuel-cell-operated-under-physiological-conditions
#15
Marcelinus Christwardana, Yongjin Chung, Yongchai Kwon
Glucose oxidase (GOx)-catalase co-immobilized catalyst (CNT/PEI/(GOx-Cat)) was synthesized, and its catalytic activity and electrical performance were investigated and compared, whereas the amount of immobilized catalase was optochemically inspected by chemiluminescence (CL) assay. With the characterizations, it was confirmed that the catalase was well immobilized on the CNT/PEI surface, whereas both the GOx and catalase play their roles well in the catalyst. According to the measurements of the current density peak of the flavin adenine dinucleotide (FAD) redox reaction, electron transfer rate, Michaelis-Menten constants and sensitivity, CNT/PEI/(GOx-Cat) shows the best values, and this is attributed to the excellent catalytic activity of GOx and the H2O2 decomposition capability of the catalase...
January 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28106201/efficient-energy-transfer-and-luminescence-properties-of-ca3y-gao-3-bo3-4-tb-3-eu-3-as-a-green-to-red-colour-tunable-phosphor-under-near-uv-excitation
#16
Wasim Ullah Khan, Junhao Li, Xiaohui Li, Qili Wu, Jing Yan, Yiqin Xu, Feiyan Xie, Jianxin Shi, Mingmei Wu
A series of Ca3Y(GaO)3(BO3)4:Tb(3+),Eu(3+) phosphors were prepared by a high-temperature solid-state reaction. Their phase structures were confirmed by powder X-ray diffraction and the element distribution was measured using transmission electron microscopy elemental mapping. The photoluminescence emission and excitation spectra and fluorescence lifetime were studied and discussed in detail. The results revealed that Eu(3+) ions can be efficiently sensitized by Tb(3+) ions under near-UV excitation. In addition, the energy transfer efficiency can be controlled by adjusting the ratio of Eu(3+) and Tb(3+) to realize colour tunable emission from green to red...
January 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28106190/nonadiabatic-photodynamics-and-uv-absorption-spectrum-of-all-trans-octatetraene
#17
Igor Lyskov, Horst Köppel, Christel M Marian
The short-time molecular quantum dynamics of all-trans-octatetraene after electronic excitation to the first bright valence state is theoretically investigated. A semiempirical approach of a multireference configuration interaction based on density functional theory, the so called hybrid DFT/MRCI, in both its original and redesigned formulations, is used for treating the electronic part of the problem. The nuclear kinetic part is defined with the help of symmetry-adapted internal coordinates also suitable for a large amplitude displacement...
January 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28106183/mechanism-of-activated-chemiluminescence-of-cyclic-peroxides-1-2-dioxetanes-and-1-2-dioxetanones
#18
Felipe A Augusto, Antonio Francés-Monerris, Ignacio Fdez Galván, Daniel Roca-Sanjuán, Erick L Bastos, Wilhelm J Baader, Roland Lindh
Almost all chemiluminescent and bioluminescent reactions involve cyclic peroxides. The structure of the peroxide and reaction conditions determine the quantum efficiency of light emission. Oxidizable fluorophores, the so-called activators, react with 1,2-dioxetanones promoting the former to their first singlet excited state. This transformation is inefficient and does not occur with 1,2-dioxetanes; however, they have been used as models for the efficient firefly bioluminescence. In this work, we use the SA-CASSCF/CASPT2 method to investigate the activated chemiexcitation of the parent 1,2-dioxetane and 1,2-dioxetanone...
January 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28106180/postsynthetic-n-methylation-making-a-metal-organic-framework-responsive-to-alkylamines
#19
Ning-Ning Yang, Wei Sun, Fu-Gui Xi, Qi Sui, Li-Jun Chen, En-Qing Gao
The postsynthetically created electron-deficient 2,2'-bipyridinium moieties in a Zr-MOF provide charge-transfer interacting sites for recognizing and capturing alkylamines with excellent selectivity; meanwhile the MOF shows fast and reversible vapochromism and luminescence quenching in response to alkyamines.
January 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28106170/assembly-of-flexible-comoo4-nimoo4%C3%A2-xh2o-and-fe2o3-electrodes-for-solid-state-asymmetric-supercapacitors
#20
Jing Wang, Leipeng Zhang, Xusong Liu, Xiang Zhang, Yanlong Tian, Xiaoxu Liu, Jiupeng Zhao, Yao Li
In this work, CoMoO4@NiMoO4·xH2O core-shell heterostructure electrode is directly grown on carbon fabric (CF) via a feasible hydrothermal procedure with CoMoO4 nanowires (NWs) as the core and NiMoO4 nanosheets (NSs) as the shell. This core-shell heterostructure could provide fast ion and electron transfer, a large number of active sites, and good strain accommodation. As a result, the CoMoO4@NiMoO4·xH2O electrode yields high-capacitance performance with a high specific capacitance of 1582 F g(-1), good cycling stability with the capacitance retention of 97...
January 20, 2017: Scientific Reports
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