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https://www.readbyqxmd.com/read/29137115/cost-effective-and-handmade-paper-based-immunosensing-device-for-electrochemical-detection-of-influenza-virus
#1
Sivaranjani Devarakonda, Renu Singh, Jyoti Bhardwaj, Jaesung Jang
Although many studies concerning the detection of influenza virus have been published, a paper-based, label-free electrochemical immunosensor has never been reported. Here, we present a cost-effective, handmade paper-based immunosensor for label-free electrochemical detection of influenza virus H1N1. This immunosensor was prepared by modifying paper with a spray of hydrophobic silica nanoparticles, and using stencil-printed electrodes. We used a glass vaporizer to spray the hydrophobic silica nanoparticles onto the paper, rendering it super-hydrophobic...
November 11, 2017: Sensors
https://www.readbyqxmd.com/read/29120853/ultrastructural-characteristics-of-the-respective-forms-of-hepatic-stellate-cells-in-chronic-hepatitis-b-as-an-example-of-high-fibroblastic-cell-plasticity-the-first-assessment-in-children
#2
Joanna Maria Lotowska, Maria Elzbieta Sobaniec-Lotowska, Dariusz Marek Lebensztejn
PURPOSE: Activation of hepatic stellate cells (HSCs), mainly responsible for extracellular matrix synthesis, is assumed to be central event in the process of liver fibrogenesis. The major objective of the research was to analyze the ultrastructural profile of activated HSCs in children with chronic hepatitis B (chB), with respect to fibrosis intensity. MATERIALS/METHODS: Ultrastructural investigations of HSCs were conducted on liver bioptates from 70 children with clinicopathologically diagnosed chB before antiviral treatment...
November 6, 2017: Advances in Medical Sciences
https://www.readbyqxmd.com/read/29101049/potentialities-of-active-membranes-with-immobilized-laccase-for-bisphenol-a-degradation
#3
Carlos Barrios-Estrada, Magdalena de Jesús Rostro-Alanis, Ana Luisa Parra, Marie-Pierre Belleville, Jose Sanchez-Marcano, Hafiz M N Iqbal, Roberto Parra-Saldívar
Herein, we report the development of immobilized laccase based membrane bioreactor as a novel bio-catalytic system for the degradation of emerging endocrine disruptor i.e., Bisphenol A. Two laccase forms i.e. (1) in-house isolated and purified from an indigenous white-rot fungi Pycnoporus sanguineus (CS43) and (2) Trametes versicolor (commercial laccase from Sigma-Aldrich(®)) were immobilized on a multi-channel ceramic membrane (1.4μm in diameter) using 4% glutaraldehyde as a cross-linking agent. The immobilization yield and bisphenol A degradation activities of immobilized laccases were recorded at various pH levels...
October 31, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29094642/shell-crosslinked-zein-nanocapsules-for-oral-codelivery-of-exemestane-and-resveratrol-in-breast-cancer-therapy
#4
Ahmed O Elzoghby, Sarah A El-Lakany, Maged W Helmy, Marwa M Abu-Serie, Nazik A Elgindy
AIM: Oral administration of exemestane (EXM) and resveratrol (RES) for breast cancer therapy has been limited by their poor solubility and low permeability. METHODS: In this study, these issues were tackled using zein nanocapsules (ZNCs) for oral EXM/RES codelivery combining drug solubilization within oily core and resistance to digestion via hydrophobic protein shell. Furthermore, higher oral stability and sustained release could be enabled by glutaraldehyde crosslinking of zein shell...
November 2, 2017: Nanomedicine
https://www.readbyqxmd.com/read/29081252/glutaraldehyde-inactivation-of-enveloped-dna-viruses-in-the-preparation-of-haemoglobin-based-oxygen-carriers
#5
Huiya Ma, Qiuhui Li, Kun Feng, Yuanyuan Zhang, Hongli Zhu, Chao Chen, Kunping Yan
Glutaraldehyde (GA), used medically as a disinfectant and as a crosslinker for haemoglobin (Hb)-based oxygen carriers (HBOCs), was investigated for its ability to inactivate viruses during the preparation of these artificial blood substitutes. Porcine parvovirus (PPV; a non-enveloped DNA virus) and porcine pseudorabies virus (PRV; an enveloped DNA virus) were used as the virus indicators. Upon treatment with 0.1 mM GA, the titer of PRV decreased from 9.62 log10 to 2.62 log10 within 0.5 h, whereas that of PPV decreased from 7...
October 28, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/29067541/bone-morphogenic-protein-2-rhbmp2-loaded-silk-fibroin-scaffolds-to-enhance-the-osteoinductivity-in-bone-tissue-engineering
#6
Guang-Yu Du, Sheng-Wei He, Chuan-Xiu Sun, Li-Dong Mi
There is an increasing demand for formulations of silk fibroin (SF) scaffolds in biomedical applications. SF was crosslinked via glutaraldehyde with osteoinductive recombinant human bone morphogenic protein-2 (rhBMP2) of different ratios viz. (i) 3% SF with no rhBMP2 (SF), (ii) 3% SF with equal amount of rhBMP2 (SF+BMP2), and (iii) 12% SF with 3% of rhBMP2 (4SF+BMP2), and these solutions were used in electrospinning-based fabrication of nanoscaffolds for evaluating increased osteoinductive potential of SF scaffolds with rhBMP2...
October 25, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29064689/in-situ-healing-of-compromised-membranes-via-polyethylenimine-functionalized-silica-microparticles
#7
Sang-Ryoung Kim, Bezawit A Getachew, Jae-Hong Kim
Microscale damages to membranes used in large-scale filtration processes for water treatment can result in severe degradation of product water quality. One promising technology to address this issue is in situ healing of compromised membranes via healing agents that are added to the feed side of a membrane system and seal the defect site because of increased hydraulic drag through damage site during filtration. We herein introduce an improved in situ membrane healing method using amine-functionalized silica microparticles that is effective under varying operating conditions, overcoming limitations faced by previous healing agents such as chitosan agglomerates...
November 7, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29022639/glucose-oxidase-and-polyacrylic-acid-based-water-swellable-enzyme-polymer-conjugates-for-promoting-glucose-detection
#8
Jungyeon Ji, Han-Ik Joh, Yongjin Chung, Yongchai Kwon
Glucose oxidase (GOx) and polyacrylic acid (PAA) based water swellable non-toxic enzyme-polymer conjugate (PAA-GOx) was immobilized on a substrate consisting of graphene oxide (GO) and polyethyleneimine (PEI) (GO-PEI) and the electrochemical performances of the new catalyst were investigated. According to the measurements, although the amount of GOx immobilized on PAA-GOx was lower than that on glutaraldehyde (GA)-GOx, which is a conventionally used conjugate, its catalytic activity was 9.6 times higher than that of GA-GOx...
October 26, 2017: Nanoscale
https://www.readbyqxmd.com/read/29020662/supercritical-carbon-dioxide-decellularised-pericardium-mechanical-and-structural-characterisation-for-applications-in-cardio-thoracic-surgery
#9
Frank R Halfwerk, Jeroen Rouwkema, Jan A Gossen, Jan G Grandjean
INTRODUCTION: Many biomaterials are used in cardio-thoracic surgery with good short-term results. However, calcification, dehiscence, and formation of scar tissue are reported. The aim of this research is to characterise decellularised pericardium after supercritical carbon dioxide (scCO2) processing as an alternative biological material for uses in cardio-thoracic surgery. METHODS: Porcine and bovine pericardium were decellularised using scCO2. Mechanical properties such as tensile strength, elastic modulus, fracture toughness and suture retention strength were determined...
October 3, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28986683/hydroxyapatite-chitosan-biocomposites-synthesized-in-the-simulated-body-fluid-and-their-drug-loading-studies
#10
Tugba Basargan, Nalan Erdol-Aydin, Gulhayat Nasun-Saygili
Hydroxyapatite (HAp) is a bioceramic applied in the biomedical areas, such as matrices for drug release control. Chitosan (CTS), a natural polymer, is another material has been widely investigated for its potential use in the drug delivery systems. In this study, the composites of HAp-CTS are produced in order to investigate their drug loading and release studies. First of all, HAp-CTS composites are produced in the presence of simulated body fluid (SBF). Analysis confirmed the structure of HAp-CTS composites...
October 6, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28982772/occupational-exposure-to-disinfectants-and-asthma-control-in-us-nurses
#11
Orianne Dumas, Aleta S Wiley, Catherine Quinot, Raphaëlle Varraso, Jan-Paul Zock, Paul K Henneberger, Frank E Speizer, Nicole Le Moual, Carlos A Camargo
Disinfectant use has been associated with adverse respiratory effects among healthcare workers. However, the specific harmful agents have not been elucidated. We examined the association between occupational exposure to disinfectants and asthma control in the Nurses' Health Study II, a large cohort of female nurses.Nurses with asthma were invited in 2014 to complete two questionnaires on their current occupation and asthma (response rate 80%). Asthma control was defined by the Asthma Control Test (ACT). Exposure to major disinfectants was evaluated by a job-task-exposure matrix (JTEM)...
October 2017: European Respiratory Journal: Official Journal of the European Society for Clinical Respiratory Physiology
https://www.readbyqxmd.com/read/28956812/sol-gel-derived-adsorbents-with-enzymatic-and-complexonate-functions-for-complex-water-remediation
#12
Roman P Pogorilyi, Ievgen Pylypchuk, Inna V Melnyk, Yurii L Zub, Gulaim A Seisenbaeva, Vadim G Kessler
Sol-gel technology is a versatile tool for preparation of complex silica-based materials with targeting functions for use as adsorbents in water purification. Most efficient removal of organic pollutants is achieved by using enzymatic reagents grafted on nano-carriers. However, enzymes are easily deactivated in the presence of heavy metal cations. In this work, we avoided inactivation of immobilized urease by Cu (II) and Cd (II) ions using magnetic nanoparticles provided with additional complexonate (diethylene triamine pentaacetic acid or DTPA) functions...
September 28, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28946477/ultrasonic-assisted-microwave-synthesis-of-poly-chitosan-co-gelatin-polyvinyl-pyrrolidone-ipn-hydrogel
#13
Yajuan Wang, Xin Zhang, Dan Qiu, Ya Li, Lihui Yao, Jingkuan Duan
The hydrogels based on gelatin cross-linked with chitosan (CS) and polyvinyl pyrrolidone (PVP) were synthesized using microwave and ultrasonic coupling technique in this study. This interpenetrating polymer network (IPN) hydrogels were cross-linked by glutaraldehyde and 1,2-Epoxy-4-vinylcyclohexane. The presence of function groups in the structure of hydrogel films were confirmed using Fourier transform infrared spectroscopy (FT-IR), thermal stability was measured by DSC, and the swelling behaviors were measured gravimetrically in distilled water at the temperature of 27°C...
January 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28932555/does-bioglue-contribute-to-anastomotic-pseudoaneurysm-after-thoracic-aortic-surgery
#14
Wei-Guo Ma, Bulat A Ziganshin, Chang-Fa Guo, Mohammad A Zafar, Richard S Sieller, Maryann Tranquilli, John A Elefteriades
BACKGROUND: Although bovine serum albumin-glutaraldehyde glue (BioGlue®) has been successfully used as a hemostatic adjunct in aortic surgical procedures, there are reports that it may lead to anastomotic pseudoaneurysm formation. We seek to examine if the use of BioGlue is associated with a high incidence of anastomotic pseudoaneurysm formation following surgical repair of thoracic aortic disease. METHODS: We reviewed the medical records and follow-up computed tomography (CT) scans of patients from 2001 to 2015 in whom BioGlue was used during surgical repair of thoracic aortic disease to detect postoperative anastomotic pseudoaneurysm formation...
August 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28926823/preparation-characterization-and-application-of-urease-nanoparticles-for-construction-of-an-improved-potentiometric-urea-biosensor
#15
Seema Jakhar, C S Pundir
The nanoparticles (NPs) aggregates of commercial urease from jack beans (Canavalia ensiformis) were prepared by desolvation and glutaraldehyde crosslinking and functionalized by cysteamine dihydrochloride. These enzyme nanoparticles (ENPs) were characterized by transmission electron microscopy (TEM), UV and Fourier transform infrared (FTIR) spectroscopy. The TEM images of urease NPs showed their size in the range, 18-100nm with an average of 51.2nm. The ENPs were more active and stable with a longer shelf life than native enzyme molecules...
September 6, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28881302/nanoparticulation-of-bovine-serum-albumin-and-poly-d-lysine-through-complex-coacervation-and-encapsulation-of-curcumin
#16
L Maldonado, R Sadeghi, J Kokini
Soluble coacervate nanoparticles were fabricated by mixing bovine serum albumin (BSA) and poly-d-lysine with low (LMW-PDL) and high molecular weights (HMW-PDL). The particle size was influenced by molecular weight, mass ratio of polyelectrolytes (PEs), and salt concentration. The smallest nanoparticles had a diameter of 212±11nm which was achieved with LMW-PDL dissolved with 0.1M NaCl at pH 7 and a mass ratio of 2.0 (BSA: PDL). SEM images showed that coacervate nanoparticles of LMW-PDL are relatively spherical in shape, while nanoparticles of HMW-PDL were irregular...
August 30, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28869533/construction-of-a-fluorescent-h%C3%A2-o%C3%A2-biosensor-with-chitosan-6-oh-immobilized-%C3%AE-cyclodextrin-derivatives
#17
Wenbo Dong, Weiping Li, Yu Chen, Yanchun Ye, Shaohua Jin
In the present work, a fluorescent H₂O₂ biosensor was constructed by encapsulating fluorescent probe Rhodamine B (RhmB) in the hydrophobic cavity of the cyclodextrin (β-CD) and immobilizing catalase (CAT) on the 2-NH₂ of chitosan (CTS) in a chitosan 6-OH immobilized β-cyclodextrin derivative (CTS-6-CD). The inclusion complex of CTS-6-CD to RhmB (CTS-6-CD-RhmB) was prepared by a solution method. Its structure and inclusion efficiency were determined by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and fluorescence spectroscopy (FL)...
September 4, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28869529/different-covalent-immobilizations-modulate-lipase-activities-of-hypocrea-pseudokoningii
#18
Marita G Pereira, Susana Velasco-Lozano, Sonia Moreno-Perez, Aline M Polizeli, Paulo R Heinen, Fernanda D A Facchini, Ana C Vici, Mariana Cereia, Benevides C Pessela, Gloria Fernandez-Lorente, Jose M Guisan, João A Jorge, Maria de Lourdes T M Polizeli
Enzyme immobilization can promote several advantages for their industrial application. In this work, a lipase from Hypocrea pseudokoningii was efficiently linked to four chemical supports: agarose activated with cyanogen bromide (CNBr), glyoxyl-agarose (GX), MANAE-agarose activated with glutaraldehyde (GA) and GA-crosslinked with glutaraldehyde. Results showed a more stable lipase with both the GA-crosslinked and GA derivatives, compared to the control (CNBr), at 50 °C, 60 °C and 70 °C. Moreover, all derivatives were stabilized when incubated with organic solvents at 50%, such as ethanol, methanol, n-propanol and cyclohexane...
September 4, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28865360/quantification-of-cell-substratum-interactions-by-atomic-force-microscopy
#19
Qian Li, Thomas Becker, Wolfgang Sand
Microorganisms adhere to surfaces and, subsequently, form biofilms. This process is of major interest in biotechnology, environmental sciences and medicine. It is crucial to understand the mechanisms of interactions between substratum and cells or biofilms. By combining force mapping-based atomic force microscopy (AFM) with pyrite-modified cantilevers we quantified the adhesion forces between undenatured planktonic or biofilm cells of Sulfobacillus thermosulfidooxidans and the substratum pyrite with values of 2...
August 30, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28859802/combination-of-physico-chemical-entrapment-and-crosslinking-of-low-activity-laccase-based-biocathode-on-carboxylated-carbon-nanotube-for-increasing-biofuel-cell-performance
#20
Marcelinus Christwardana
New laccase-based catalysts to improve oxygen reduction reactions (ORR) are described, and enzymatic biofuel cells (EBCs) adopting these catalysts were developed. These new catalysts are synthesized by combining laccase, poly(ethylenimine) and carbon nanotubes, with attachment of selected elements using the crosslinker, glutaraldehyde (GA). Several characterization approaches are implemented to evaluate catalytic electron transfer in both the absence and presence of mediators and their effects on glucose/O2 biofuel cell performance...
November 2017: Enzyme and Microbial Technology
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