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https://www.readbyqxmd.com/read/29778044/electrodeposited-styrylquinolinium-dye-as-molecular-electrocatalyst-for-coupled-redox-reactions
#1
Yolina Hubenova, Rumyana Bakalska, Mario Mitov
Modification of carbonaceous materials with different conductive coatings is a successful approach to enhance their electrocatalytic activity and thus to increase the electrical outputs when used as electrodes in biofuel cells. In this study, a methodology for electrodeposition of styrylquinolinium dye on carbon felt was developed. The produced dye electrodeposits were characterized by means of AFM, ESI-MS/MS and NMR spectroscopy. The obtained data reveal that the dye forms overlaid layers consisting of monomer molecules most likely with an antiparallel orientation...
May 10, 2018: Bioelectrochemistry
https://www.readbyqxmd.com/read/29778024/simultaneous-glucose-production-from-cellulose-and-fouling-reduction-using-a-magnetic-responsive-membrane-reactor-with-superparamagnetic-nanoparticles-carrying-cellulolytic-enzymes
#2
Abaynesh Yihdego Gebreyohannes, Madhav Dharmjeet, Tom Swusten, Matthias Mertens, Joran Verspreet, Thierry Verbiest, Christophe M Courtin, Ivo F J Vankelecom
This work aimed at investigating simultaneous hydrolysis of cellulose and in-situ foulant degradation in a cellulose fed superparamagnetic biocatalytic membrane reactor (BMRSP ). In this reactor, a dynamic layer of superparamagnetic bionanocomposites with immobilized cellulolytic enzymes were reversibly immobilized on superparamagnetic polymeric membrane using an external magnetic field. The formation of a dynamic layer of bionanocomposites on the membrane helped to prevent direct membrane-foulant interaction...
May 2, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29778002/plasmonic-colorimetric-sensors-based-on-etching-and-growth-of-noble-metal-nanoparticles-strategies-and-applications
#3
REVIEW
Zhiyang Zhang, Han Wang, Zhaopeng Chen, Xiaoyan Wang, Jaebum Choo, Lingxin Chen
Plasmonic colorimetric sensors have emerged as a powerful tool in chemical and biological sensing applications due to the localized surface plasmon resonance (LSPR) extinction in the visible range. Among the plasmonic sensors, the most famous sensing mode is the "aggregation" plasmonic colorimetric sensor which is based on plasmon coupling due to nanoparticle aggregation. Herein, this review focuses on the newly-developing plasmonic colorimetric sensing mode - the etching or the growth of metal nanoparticles induces plasmon changes, namely, "non-aggregation" plasmonic colorimetric sensor...
May 9, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29778001/patchy-gold-coated-fe-3-o-4-nanospheres-with-enhanced-catalytic-activity-applied-for-paper-based-bipolar-electrode-electrochemiluminescence-aptasensors
#4
Xin Zhang, Ning Bao, Xiliang Luo, Shou-Nian Ding
In this work, novel multifunctional patchy gold coated Fe3 O4 hybrid nanoparticles (PG-Fe3 O4 NPs) have been successfully synthesized in aqueous medium via a facile adsorption-reduction method. A rational formation mechanism has been proposed by monitoring the morphological evolution. The PG-Fe3 O4 NPs retained the good magnetic property and exhibited excellent catalytical effeciency towards the electrochemical reduction of hydrogen peroxide. Chronoamperometric and amperometric experiments indicated a relatively high catalytic rate constant of 3...
May 10, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29777816/aptamer-based-assay-for-monitoring-genetic-disorder-phenylketonuria-pku
#5
Mohammad Hasanzadeh, Amir Zargami, Hossein Navay Baghban, Ahad Mokhtarzadeh, Nasrin Shadjou, Soltanali Mahboob
The genetic disorder phenylketonuria (PKU) is the inability to metabolize phenylalanine because of a lack of the enzyme phenylalanine hydroxylase. Phenylalanine is used to biochemically form proteins, coded for by DNA. The development of an apta-assay for detection of l-Phenylalanine is presented in this work. A highly specific DNA-aptamer, selected to l-Phenylalanine was immobilized onto a gold nanostructure and electrochemical measurements were performed in a solution containing the phosphate buffer solution with physiological pH...
May 16, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29777804/towards-an-affordable-enzymatic-production-of-biopolyols-comparing-the-immobilization-of-lipases-by-two-optimized-techniques
#6
Milda Šulcienė, Boris Kolvenbach, Erik Ammann, Inga Matijošytė
The production of biopolyols (sustainable, renewable and biodegradable precursors), is exclusively focused on the conventional chemical synthesis pathways, and currently, no polyols are produced by enzymatic processes at an industrial scale, because they are not competitive when compared to petrochemically based polyols due to the overall cost for their production. This can be mainly attributed to the high costs of commercial enzymes used in this process and their use is limited by their lack of stability during the bioprocess...
May 16, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29777597/microdevice-based-solid-phase-polymerase-chain-reaction-for-rapid-detection-of-pathogenic-microorganisms
#7
Quang Nghia Pham, Kieu The Loan Trinh, Seung Won Jung, Nae Yoon Lee
We demonstrate the integration of DNA amplification and detection functionalities developed on a lab-on-a-chip microdevice utilizing solid-phase polymerase chain reaction (SP-PCR) for point-of-need (PON) DNA analyses. First, the polycarbonate microdevice was fabricated by thermal bonding to contain microchambers as reservoirs for performing SP-PCR. Next, the microchambers were subsequently modified with polyethyleneimine and glutaraldehyde for immobilizing amine-modified forward primers. During SP-PCR, the immobilized forward primers and freely diffusing fluorescence-labeled reverse primers cooperated to generate target amplicons, which remained covalently attached to the microchambers for the fluorescence detection...
May 19, 2018: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/29777442/study-on-immobilization-of-marine-oil-degrading-bacteria-by-carrier-of-algae-materials
#8
Yiran Zhang, Wei Gao, Faxiang Lin, Bin Han, Changfei He, Qian Li, Xiangxing Gao, Zhisong Cui, Chengjun Sun, Li Zheng
This study investigated the immobilizations with of bacteria two kinds of algal materials, Enteromorpha residue and kelp residue. The lipophilicity of them were compared by diesel absorption rates. The immobilization efficiency of Bacillus sp. E3 was measured to evaluate whether these carriers would satisfy the requirement for biodegradation of oil spills. The bacteria were immobilized through adsorption with the sterilized and non-sterilized carriers to compare the differences between the two treatments. Oil degradation rates were determined using gravimetric and GC-MS methods...
May 18, 2018: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/29777138/shining-light-on-molecular-mechanism-for-odor-selectivity-of-cnt-immobilized-olfactory-receptor
#9
Liyun Zhang, Yuan Yuan, Tian Ren, Yanzhi Guo, Chuan Li, Xuemei Pu
Olfactory receptor (OR)-based bioelectronic nose is a new type of bio-affinity sensor applied for detecting numerous odorant molecules. In order to elucidate the effect of the adsorption of nanomaterial carriers on the receptor structure and its selectivity to odors, we used a systematic computation-scheme to study two OR models immobilized onto carbon nanotube. Our result indicates that there is a multistep OR-adsorption process driven by hydrophobic interaction. Many allosteric communication pathways exist between the absorbed residues and the pocket ones, leading to a significant shrinkage of the pocket...
May 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29777034/membrane-fluctuations-and-acidosis-regulate-cooperative-binding-of-marker-of-self-cd47-with-macrophage-checkpoint-receptor-sirp%C3%AE
#10
Jan Steinkühler, Bartosz Różycki, Cory Alvey, Reinhard Lipowsky, Thomas R Weikl, Rumiana Dimova, Dennis E Discher
Cell-cell interactions that result from membrane proteins binding weakly in trans can cause accumulations in cis that suggest cooperativity and thereby an acute sensitivity to environmental factors. The ubiquitous "marker of self" protein CD47 binds weakly to SIRPα on a macrophage, which leads to accumulation of SIRPα at a phagocytic synapse and ultimately to inhibition of engulfment of 'self' cells - including cancer cells. We reconstituted this macrophage checkpoint with CD47-GFP displayed on giant vesicles generated from plasma membranes and then imaged vesicles adhering to SIRPα immobilized on a surface...
May 18, 2018: Journal of Cell Science
https://www.readbyqxmd.com/read/29776548/a-label-free-electrochemical-biosensor-for-direct-detection-of-rack-1-by-using-disposable-low-cost-and-reproducible-ito-based-electrode
#11
Hakan Törer, Elif Burcu Aydın, Mustafa Kemal Sezgintürk
In this study we designed an ultrasensitive electrochemical immunosensor for RACK 1 detection using 11-cyanoundecyltrimethoxysilane (11-CUTMS) as a immobilization matrix to immobilize biorecognition element. The used silane agent (11-CUTMS) provides a favorable platform for efficient loading of anti-RACK 1 antibody. The effective loading of the biorecognition element on the 11-CUTMS matrix was monitored by scanning electron microscopy (SEM), atomic force microscopy (AFM) images and fourier transform infrared spectroscopy (FTIR) spectra...
September 18, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29776183/slowdown-of-surface-diffusion-during-early-stages-of-bacterial-colonization
#12
T Vourc'h, H Peerhossaini, J Léopoldès, A Méjean, F Chauvat, C Cassier-Chauvat
We study the surface diffusion of the model cyanobacterium Synechocystis sp. PCC6803 during the incipient stages of cell contact with a glass surface in the dilute regime. We observe a twitching motility with alternating immobile tumble and mobile run periods, resulting in a normal diffusion described by a continuous-time random walk with a coefficient of diffusion D. Surprisingly, D is found to decrease with time down to a plateau. This is observed only when the cyanobacterial cells are able to produce released extracellular polysaccharides, as shown by a comparative study between the wild-type strain and various polysaccharides-depleted mutants...
March 2018: Physical Review. E
https://www.readbyqxmd.com/read/29775904/biosynthesis-of-chiral-epichlorohydrin-using-an-immobilized-halohydrin-dehalogenase-in-aqueous-and-non-aqueous-phase
#13
Xiao-Jian Zhang, Ping-Xiu Shi, Han-Zhong Deng, Xin-Xin Wang, Zhi-Qiang Liu, Yu-Guo Zheng
Asymmetric synthesis of chiral epichlorohydrin (ECH) from 1,3-dichloro-2-propanol (1,3-DCP) using halohydrin dehalogenase (HHDH) is of great value due to the 100% theoretical yield and high enantioselectivity. In this study, HheC (P175S/W249P) was immobilized on an A502Ps resin and used for the preparation of (S)-ECH. In aqueous system, the immobilized HheC catalyzed the biosynthesis of (S)-ECH with 83.78% yield and 92.53% enantiomeric excess (ee) at 1,3-DCP concentration of 20 mM. The non-aqueous system was further developed using water saturated ethyl acetate as solvent and reaction phase...
May 8, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29775855/dual-core-all-fiber-integrated-immunosensor-for-detection-of-protein-antigens
#14
Karol Wysokiński, Dawid Budnicki, Janusz Fidelus, Łukasz Szostkiewicz, Łukasz Ostrowski, Micha Murawski, Marcin Staniszewski, Magdalena Staniszewska, Marek Napierała, Tomasz Nasiłowski
An optical fiber interferometric microprobe for detection of specific proteins is presented in this paper. The microprobe is an all-fiber device, which is based on Michelson interferometer configuration, which allows for detection of protein antigens in an analyzed solution thanks to antibodies immobilized on the sensor surface. The interferometer is made of dual core fiber and has a precisely formed arm length difference, achieved by splicing a fragment of polarization maintaining fiber to one of the cores...
May 9, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29775853/an-ultrasensitive-electrochemiluminescence-biosensor-for-detection-of-microrna-by-in-situ-electrochemically-generated-copper-nanoclusters-as-luminophore-and-tio-2-as-coreaction-accelerator
#15
Hongxia Liao, Ying Zhou, Yaqin Chai, Ruo Yuan
Herein, we constructed an ultrasensitive electrochemiluminescence (ECL) biosensor for detecting microRNA-21 (miR-21) based on in-situ generation of copper nanoclusters (Cu NCs) as luminophore and titanium dioxide (TiO2 ) as coreaction accelerator. First, numerous AT-rich double-stranded DNA (dsDNA) was produced from the conversion of a small amount of target miR-21 via the combination of exonuclease III (Exo III)-assisted amplification and hybridization chain reaction (HCR), which could reduce the aggregation-caused self-etching effect of Cu NCs and improve the emitting of Cu NCs...
May 8, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29775843/transfer-of-radionuclides-and-dose-assessment-to-ants-and-anthills-in-a-swedish-forest-ecosystem
#16
K Rosén, L Lenoir, K Stark, M Vinichuk, S Sundell-Bergman
In forest ecosystems soil organisms are important for immobilization, translocation and recycling of radionuclides. Still, there is a lack of studies on the role of insects such as ants in the turnover of radionuclides and how radioactivity affects an ant community. In this study seven anthills were sampled in an area that was heavily contaminated after the fallout from the Chernobyl accident. Samples of ant and anthill materials were taken from different depths of the anthills as well as from the surrounding soil and the activity concentrations of 137 Cs were determined...
May 15, 2018: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/29775711/co-expression-purification-and-characterization-of-the-lipase-and-foldase-of-burkholderia-contaminans-lteb11
#17
Robson Carlos Alnoch, Adriano Alves Stefanello, Viviane de Paula Martini, Jeferson Luiz Richter, Cesar Mateo, Emanuel Maltempi de Souza, David Alexander Mitchell, Marcelo Muller-Santos, Nadia Krieger
Genes encoding lipase LipBC (lipA) and foldase LifBC (lipB) were identified in the genome of Burkholderia contaminans LTEB11. Analysis of the predicted amino acid sequence of lipA showed its high identity with lipases from Pseudomonas luteola (91%), Burkholderia cepacia (96%) and Burkholderia lata (97%), and classified LipBC lipase in the lipase subfamily I.2. The genes lipA and lipB were amplified and cloned into expression vectors pET28a(+) and pT7-7, respectively. His-tagged LipBC and native LifBC were co-expressed in Escherichia coli and purified...
May 15, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29775613/suppression-of-nlrp3-inflammasome-attenuates-stress-induced-depression-like-behavior-in-nlgn3-deficient-mice
#18
Ze-Qun Li, Zhi-Yuan Yan, Bo-Jun Lan, Yi-Qun Dong, Ye Xiong
Depression, regulated by central nervous system (CNS), is a significant inflammatory disorder. Neuroligin3 (NLGN3) has been implicated in brain functions. In the study, a chronic unpredictable mild stress (CUMS) model in wild type (WT) or NLGN3-knockout (KO) mice was established to explore the role of NLGN3 in regulating depression and to reveal the underlying molecular mechanism. The results indicated that NLGN3-knockout markedly reversed the loss of body weight, the reduction of sucrose consumption, the decrease of immobile time in the forced swimming tests (FST) and tail suspension tests (TST) induced by CUMS paradigm...
May 15, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29775289/mass-spectral-detection-of-diethoxyphospho-tyrosine-adducts-on-proteins-from-hek293-cells-using-monoclonal-antibody-depy-for-enrichment
#19
Seda Onder, Lawrence M Schopfer, Ozden Tacal, Thomas A Blake, Rudolph C Johnson, Oksana Lockridge
Chronic illness from exposure to organophosphorus toxicants is hypothesized to involve modification of unknown proteins. Tyrosine in proteins that have no active site serine readily reacts with organophosphorus toxicants. We developed a monoclonal antibody, depY, that specifically recognizes diethoxyphospho-tyrosine in proteins and peptides, independent of the surrounding amino acid sequence. Our goal in the current study was to identify diethoxyphosphorylated proteins in human HEK293 cell lysate treated with chlorpyrifos oxon...
May 18, 2018: Chemical Research in Toxicology
https://www.readbyqxmd.com/read/29775278/hybrid-nanomaterials-with-single-site-catalysts-by-spatially-controllable-immobilization-of-nickel-complexes-via-photoclick-chemistry-for-alkene-epoxidation
#20
Dwaipayan Ghosh, Benny Febriansyah, Disha Gupta, Leonard Kia-Sheun Ng, Shibo Xi, Yonghua Du, Tom Baikie, ZhiLi Dong, Han Sen Soo
Catalyst deactivation is a persistent problem not only for the scientific community but also in industry. Isolated single-site heterogeneous catalysts have shown great promise to overcome these problems. Here, a versatile anchoring strategy for molecular complex immobilization on a broad range of semiconducting or insulating metal oxide (e.g. titanium dioxide, mesoporous silica, cerium oxide, and tungsten oxide) nanoparticles to synthesize isolated single-site catalysts has been studied systematically. An oxidatively stable anchoring group, maleimide, is shown to form covalent linkages with surface hydroxyl functionalities of metal oxide nanoparticles by photoclick chemistry...
May 18, 2018: ACS Nano
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