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https://www.readbyqxmd.com/read/28820469/a-third-generation-glucose-biosensor-based-on-cellobiose-dehydrogenase-immobilized-on-a-glassy-carbon-electrode-decorated-with-electrodeposited-gold-nanoparticles-characterization-and-application-in-human-saliva
#1
Paolo Bollella, Lo Gorton, Roland Ludwig, Riccarda Antiochia
Efficient direct electron transfer (DET) between a cellobiose dehydrogenase mutant from Corynascus thermophilus (CtCDH C291Y) and a novel glassy carbon (GC)-modified electrode, obtained by direct electrodeposition of gold nanoparticles (AuNPs) was realized. The electrode was further modified with a mixed self-assembled monolayer of 4-aminothiophenol (4-APh) and 4-mercaptobenzoic acid (4-MBA), by using glutaraldehyde (GA) as cross-linking agent. The CtCDH C291Y/GA/4-APh,4-MBA/AuNPs/GC platform showed an apparent heterogeneous electron transfer rate constant (ks) of 19...
August 18, 2017: Sensors
https://www.readbyqxmd.com/read/28820049/receptor-binding-assay-for-the-detection-of-paralytic-shellfish-poisoning-toxins-comparison-to-the-mouse-bioassay-and-applicability-under-regulatory-use
#2
Shiyamalie R Ruberu, Gregg W Langlois, Melisa Masuda, Clive Kittredge, S Kusum Perera, Raphael M Kudela
The receptor-binding assay (RBA) method for the detection of paralytic shellfish poisoning (PSP) toxins was evaluated for its overall performance in comparison with the mouse bioassay (MBA). An initial study to evaluate the effects of filtering shellfish extracts prior to running the RBA indicated no significant difference between filtered and unfiltered extracts on the determined saxitoxin concentrations. Next, we tested the RBA assay on 295 naturally contaminated mussel tissue samples, ranging in concentrations from 320 µg STX equiv...
August 18, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28806098/social-media-monitoring-2016-zika-response-in-nyc
#3
Tamer Hadi, Jennifer MacGregor, Lauren Mann
From the Field is a semi-regular column that explores what it means to be a local health professional on the front lines of an emergency. National Association of County and City Health Officials (NACCHO) members share their stories of preparing for and responding to disasters, epidemics, and other major health issues. Through exploring the analysis of the challenges faced and the solutions developed, readers can learn how these public health champions keep their communities safe even in extreme situations. Readers may submit topics of interest to the column's editor, Meghan McGinty, PhD, MPH, MBA, at mmcginty@naccho...
August 14, 2017: Health Security
https://www.readbyqxmd.com/read/28805228/highly-dispersed-tio2-nanoparticles-with-abundant-active-sites-induced-by-surfactants-as-a-prominent-substrate-for-sers-charge-transfer-contribution
#4
Libin Yang, Di Yin, Yu Shen, Ming Yang, Xiuling Li, Xiaoxia Han, Xin Jiang, Bing Zhao
In this study, highly-dispersed TiO2 nanoparticles (NPs) with abundant active sites were synthesized by a simple sol-hydrothermal method with the assistance of surfactant polyethylene glycol (PEG) which served as an effective SERS-active substrate for the first time. The observed considerable SERS enhancement of 4-mercaptobenzoic acid (4-MBA) probe molecules on TiO2 NPs is attributed to the contribution of the charge transfer mechanism from the substrate to the probe molecule. It is suggested that PEG can act as a protective agent in the reductive calcination of the surfactant-coated nanocrystallite and consequently brings about abundant surface oxygen vacancies for TiO2 NPs, which provide more effective sites for the adsorption of probe molecules and promote the charge transfer effect and its consequent SERS enhancement...
August 14, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28792290/pearls-and-pitfalls-for-prescribing-opioids-in-a-climate-of-increased-provider-scrutiny
#5
Joanna Gedzior, Arlen Kwong
In August 2016, U.S. Surgeon General Vivek Murthy, MD, MBA, issued a letter to healthcare providers requesting aid in addressing "an urgent health crisis facing America: the opioid epidemic." In this article, we address some of the more poignant challenges that surface in treating patients with opiate addiction. We provide an outline of recommendations from the leading medical organizations to educate primary care providers on how to navigate patients to decreased or discontinued medication loads.
March 2017: International Journal of Psychiatry in Medicine
https://www.readbyqxmd.com/read/28772770/preparation-and-characterization-of-thermoresponsive-poly-n-isopropylacrylamide-co-acrylic-acid-grafted-hollow-fe%C3%A2-o%C3%A2-sio%C3%A2-microspheres-with-surface-holes-for-bsa-release
#6
Jing Zhao, Ming Zeng, Kaiqiang Zheng, Xinhua He, Minqiang Xie, Xiaoyi Fu
Thermoresponsive P(NIPAM-AA)/Fe₃O₄/SiO₂ microspheres with surface holes serving as carriers were prepared using p-Fe₃O₄/SiO₂ microspheres with a thermoresponsive copolymer. The p-Fe₃O₄/SiO₂ microspheres was obtained using a modified Pickering method and chemical etching. The surface pore size of p-Fe₃O₄/SiO₂ microspheres was in the range of 18.3 nm~37.2 nm and the cavity size was approximately 60 nm, which are suitable for loading and transporting biological macromolecules. P(NIPAM-AA) was synthesized inside and outside of the p-Fe₃O₄/SiO₂ microspheres via atom transfer radical polymerization of NIPAM, MBA and AA...
April 14, 2017: Materials
https://www.readbyqxmd.com/read/28770990/multiplex-immunochips-for-high-accuracy-detection-of-afp-l3-based-on-surface-enhanced-raman-scattering-implications-for-early-liver-cancer-diagnosis
#7
Hao Ma, Xiaoying Sun, Lei Chen, Weina Cheng, Xiao Xia Han, Bing Zhao, Chengyan He
α-Fetoprotein (AFP) is an important tumor biomarker. In particular, the overexpression of AFP-L3 is associated with hepatocellular carcinoma (HCC). Accordingly, several hospitals have begun to employ the ratio of AFP-L3 to the total AFP level (AFP-L3%) as new diagnostic evidence for HCC owing to its high diagnostic accuracy. However, current methods of detection for AFP and AFP-L3 are time-consuming, require multiple samples, and lack in sensitivity and specificity. Herein, we present a novel concept for the early diagnosis of HCC based on the combination of Raman frequency shift and intensity change, and developed surface-enhanced Raman scattering (SERS)-based immunochips via AFP-L3%...
August 10, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28763421/filling-the-pipeline-aoa-critical-issues
#8
Sanford E Emery
This is the Presidential Address, "Filling the Pipeline," that was given by Sanford E. Emery, MD, MBA, at the Annual Meeting of the American Orthopaedic Association in June 2016.
August 2, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28758568/mother-to-child-hiv-transmission-prevention-programs-in-a-sub-saharan-african-setting-the-gabonese-experience
#9
Armel Mintsa-Ndong, Corneille Ndong-Ella, Roselyne K Boussougou, Léatitia M Busugu, Alexandre Mba, Franck A Agwambouet, Nicolas Barro, Joel F Djoba Siawaya
In many developing countries, mothers' awareness remains a challenge despite the scaling up of antenatal care and programs preventing mother-to-child (MTC) HIV transmission. The present study was done in Libreville, Gabon where all antenatal care (delivery included) is free of charge. Here we assessed the timing of antenatal antiretroviral (ARV) prophylaxis initiation, HIV-exposed infants' age at their first postnatal HIV check visit and investigated the association between mothers' awareness or knowledge on their ARV therapy and infants' HIV infection...
January 1, 2017: International Journal of STD & AIDS
https://www.readbyqxmd.com/read/28752765/gold-embedded-hollow-silica-nanogolf-balls-for-imaging-and-photothermal-therapy
#10
Woraphong Janetanakit, Liping Wang, Karla Santacruz-Gomez, Preston B Landon, Paul L Sud, Nirav Patel, Grace Jang, Malvika Jain, Alice Yepremyan, Sami A Kazmi, Deependra K Ban, Feng Zhang, Ratnesh Lal
Hybrid nanocarriers with multifunctional properties have wide therapeutic and diagnostic applications. We have constructed hollow silica nanogolf balls (HGBs) and gold-embedded hollow silica nanogolf balls (Au@SiO2 HGBs) using the layer-by-layer approach on a symmetric polystyrene (PS) Janus template; the template consists of smaller PS spheres attached to an oppositely charged large PS core. ζ Potential measurement supports the electric force-based template-assisted synthesis mechanism. Electron microscopy, UV-vis, and near-infrared (NIR) spectroscopy show that HGBs or Au@SiO2 HGBs are composed of a porous silica shell with an optional dense layer of gold nanoparticles embedded in the silica shell...
August 8, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28745207/hiv-drug-resistance-testing-in-a-resource-limited-setting-with-high-viral-diversity-the-first-twenty-eight-months-experience
#11
Elodie Teclaire Ngo-Malabo, Paul Alain Ngoupo, Serge Alain Sadeuh-Mba, Emmanuel Akongnwi, Robert Banaï, Laure Ngono, Richard Njouom, Charles Felix Bilong-Bilong, Anfumbom Kfutwah
BACKGROUND: First line antiretroviral therapy in a resource-limited setting consists of nucleotide and non-nucleotide reverse transcriptase inhibitors. Protease inhibitors are the hub of second line therapy. The decision to change antiretroviral therapy for a patient is frequently presumptive because of the lack of genotypic resistance tests in routine follow-up. We describe here the resistance profiles observed in patients with varying terms of antiretroviral therapy in Cameroon after implementation of HIV genotypic resistance testing in routine practice...
July 25, 2017: Current HIV Research
https://www.readbyqxmd.com/read/28741684/how-does-mandibular-bone-atrophy-influence-the-masticatory-function-ohrqol-and-satisfaction-in-overdenture-wearers-clinical-results-until-1-year-post-loading
#12
Raissa Micaella Marcello-Machado, Fernanda Faot, Alessandra Julie Schuster, Amália Machado Bielemann, Otacílio Luiz Chagas Júnior, Altair Antoninha Del Bel Cury
This longitudinal clinical study investigated the differences in the masticatory function (MF), satisfaction and oral health related quality of life (OHRQoL) between atrophic patients (AP) and non-atrophic patients (NAP) before and after rehabilitation with mandibular overdenture (MO). Twenty-six complete denture (CD) wearers were categorized into two groups, according to the mandibular bone atrophy (MBA) degree. MF was evaluated before and after 1, 3, 6 and 12 months of the MO loading via 2 standardized tests: i) MP, masticatory performance (MP_X50, MPB, ME 5...
July 25, 2017: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/28722605/characterizing-reactivity-to-onchocerca-volvulus-antigens-in-multiplex-bead-assays
#13
Karla R Feeser, Vitaliano Cama, Jeffrey W Priest, Elizabeth A Thiele, Ryan E Wiegand, Thomson Lakwo, Sendeaw M Feleke, Paul T Cantey
Multiplex bead assays (MBAs) may provide a powerful integrated tool for monitoring, evaluation, and post-elimination surveillance of onchocerciasis and co-endemic diseases; however, the specificity and sensitivity of Onchocerca volvulus antigens have not been characterized within this context. An MBA was developed to evaluate three antigens (OV-16, OV-17, and OV-33) for onchocerciasis. Receiver operating characteristics (ROC) analyses were used to characterize antigen performance using a panel of 610 specimens: 109 O...
July 3, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28696460/mesoporous-semiconducting-tio2-with-rich-active-sites-as-a-remarkable-substrate-for-surface-enhanced-raman-scattering
#14
Libin Yang, Di Yin, Yu Shen, Ming Yang, Xiuling Li, Xiaoxia Han, Xin Jiang, Bing Zhao
Recently, surface-enhanced Raman scattering (SERS) research based on semiconductor TiO2 has received increasing attention. However, the practical application of TiO2 SERS-active substrates has been hampered due to their lower surface performance and detection sensitivity. Here we report a new strategy to enhance the SERS activity of TiO2 nanoparticles (NPs) by means of formation of a mesoporous framework via reductive calcination of polymer coated nanocrystals. The 4-mercaptobenzoic acid (4-MBA) probe molecules on the mesoporous TiO2 substrate exhibit larger SERS enhancement compared with that on the ordinary TiO2 NP substrate; this considerable SERS enhancement mainly stems from the contributions of rich surface active sites of mesoporous TiO2, which can provide more effective adsorption sites for the molecules and promote the charge transfer between the substrate and the adsorbed molecule, and thus remarkably enhance SERS signals...
July 11, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28687054/enhancing-cisplatin-delivery-to-hepatocellular-carcinoma-hepg2-cells-using-dual-sensitive-smart-nanocomposite
#15
Farzaneh Salimi, Karim Akbari Dilmaghani, Effat Alizadeh, Abolfazl Akbarzadeh, Soodabeh Davaran
Targeted entrance and accumulation of higher doses of drugs into malignant cells could help in intensification of tumor specific cytotoxicity. A dual-responsive nanogel, poly(N-isopropylacrylamide)-co-poly(N,N-(dimethylamino)ethyl methacrylate) [P(NIPAM-co-DMA)] containing N-isopropylacrylamide (NIPAM) as thermoresponsive monomer and N,N-(dimethylamino)ethyl methacrylate (DMA) as pH-responsive monomer and methylene-bis-acrylamide (MBA) as cross-linking agent, was synthesized by free radical emulsion polymerization...
July 7, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28669803/enhancement-of-antioxidant-and-antibacterial-properties-for-tannin-acid-chitosan-tripolyphosphate-nanoparticles-filled-electrospinning-films-surface-modification-of-sliver-nanoparticles
#16
Fuchao Zhan, Feng Sheng, Xiangxing Yan, Yingrui Zhu, Weiping Jin, Jing Li, Bin Li
The tannin acid/chitosan/tripolyphosphate nanoparticles were encapsulated in polyvinyl alcohol (PVA)/poly-acrylic acid (PAA) electrospinning films by electrostatic spinning technology. To optimize the prepared condition, properties and morphology of nanoparticles were characterized by dynamic light scattering (DLS) and transmission electron microscope (TEM). The optimized initial concentration of tannin, chitosan and tripolyphosphate solutions were 1, 1, 0.5mg/ml, respectively, with adding proportion for 5:5:1...
June 29, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28660783/interview-with-justin-davies-and-andrew-tochterman
#17
Justin Davies, Andrew Tochterman
Justin Davies and Andrew Tochterman speak to Adam Price-Evans, Commissioning Editor of Future Cardiology: Justin Davies is a Senior Research Fellow and Honorary Consultant Cardiologist at the National Heart and Lung Institute, Imperial College London (UK). His main research interests include the development and application of pioneering technologies in engineering to aid understanding of disease mechanisms, and in the diagnosis of pathological disease states. After completing his undergraduate training at Imperial College, he was awarded a prestigious British Heart Foundation research fellowship to undertake his PhD at Imperial College...
July 2017: Future Cardiology
https://www.readbyqxmd.com/read/28655315/comparison-of-apoptosis-in-human-primary-pulmonary-endothelial-cells-and-a-brain-microvascular-endothelial-cell-line-co-cultured-with-plasmodium-falciparum-field-isolates
#18
Jean Claude Biteghe Bi Essone, Nadine N'Dilimabaka, Julien Ondzaga, Jean Bernard Lekana-Douki, Dieudonné Nkoghe Mba, Philippe Deloron, Dominique Mazier, Frédrérick Gay, Fousseyni S Touré Ndouo
BACKGROUND: Plasmodium falciparum infection can progress unpredictably to severe forms including respiratory distress and cerebral malaria. The mechanisms underlying the variable natural course of malaria remain elusive. METHODS: The cerebral microvascular endothelial cells-D3 and lung endothelial cells both from human were cultured separately and challenged with P. falciparum field isolates taken directly from malaria patients or 3D7 strain (in vitro maintained culture)...
June 27, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28630513/career-progression-of-the-pharmacy-mba-professional-characterization-and-perceptions-of-the-combined-degree
#19
Christopher J Daly, Sarah-Elizabeth L Tierney, Erin O'Brien, Karl D Fiebelkorn, David M Jacobs
Objectives. To characterize pharmacy/MBA professionals during their entry-level and current positions and to describe their attitudes and perceptions toward their combined degree. Methods. A cross-sectional survey of University at Buffalo (UB) alumni who obtained both pharmacy and MBA degrees was used. An electronic survey was developed through collaboration with the UB School of Management and administered in winter 2015. Results. A total of 68/115 (59% response rate) pharmacy/MBA professionals responded to the survey...
May 2017: American Journal of Pharmaceutical Education
https://www.readbyqxmd.com/read/28630512/attitudes-and-perceptions-of-dual-pharmd-mba-degree-program-students
#20
David M Jacobs, Christopher J Daly, Sarah-Elizabeth L Tierney, Erin O'Brien, Karl D Fiebelkorn
Objectives. To understand pharmacy students' reasons for pursuing a dual PharmD/MBA degree and their perceptions of the impact a dual degree will have on their careers. Methods. This was a cross-sectional survey of registered students in the University at Buffalo PharmD/MBA program. An electronic survey was developed through collaboration with the UB School of Management and administered in January 2015. Results. A total of 23/24 (96% response rate) students who were enrolled in the PharmD/MBA curriculum responded to the survey...
May 2017: American Journal of Pharmaceutical Education
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