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https://www.readbyqxmd.com/read/29793093/graphene-oxide-assisted-au-nanoparticle-strip-biosensor-based-on-gr-5-dnazyme-for-rapid-lead-ion-detection
#1
Hai-Bo Wang, Li-Hong Ma, Bi-Yun Fang, Yuan-Di Zhao, Xue-Bin Hu
This study has reported that a GR-5 DNAzyme based lead ion strip biosensor could exhibit an enhanced specificity with the assistance of graphene oxide (GO). This enhancement results from the specific π-stacking interaction between the ribose rings of the nucleobases and the carbon hexagons in GO which can reduce the false positive interference by removing unhybridized ssDNA during the annealing of GR-5 DNAzyme. Meanwhile, conjugate pad was sprayed with two kinds of AuNP-DNA probes, and nitrocellulose membrane test zone and control zone were immobilized with two kinds of biotin-DNA probes, respectively...
May 21, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29792941/in-situ-analysis-of-grain-rotation-and-lattice-strain-within-a-magnesium-polycrystal-based-on-synchrotron-polychromatic-x-ray-diffraction-technique-i-prior-to-twin
#2
Li Li, Yuanzhi Wu, Jie Wu
Hexagonal-close-packed structure aggregates exhibit complicated deformation behaviors, involving different slips and twinning. Synchrotron polychromatic X-ray microdiffraction (micro-XRD) was utilized to study in situ an extruded Mg-3Al-1Zn strip subjected to uniaxial tension. The evolution of grain rotation and lattice strain was analyzed under the load levels from 12 to 73 MPa. The micro-XRD data was used to map an area of 396 × 200 μm within the region of interest. The experimental set-up and X-ray diffraction microscopy in two dimensions allow the morphology, orientation and strain of the target grain to be determined at the submicron size...
May 17, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/29792679/a-nanozyme-and-ambient-light-based-smartphone-platform-for-simultaneous-detection-of-dual-biomarkers-from-exposure-to-organophosphorus-pesticides
#3
Yuting Zhao, Mingming Yang, Qiangqiang Fu, Hui Ouyang, Wei Wen, Yang Song, Chengzhou Zhu, Yuehe Lin, Dan Du
A transparent, lateral-flow test strip coupled with a smartphone-based ambient light sensor was first proposed for detect-ing enzymatic inhibition and phosphorylation. The principle of the platform is based on the simultaneous measurement of the total amount of the enzyme and enzyme activity to biomonitor exposure to organophosphorus (OP) pesticides. In this study, butyrylcholinesterase (BChE) was adopted as the model enzyme and ethyl paraoxon was chosen as an analyte representing OP pesticides. The total amount of BChE was quantified by a sensitive colorimetric signal originating from a sandwich immunochromatographic assay utilizing PtPd nanoparticles as a polyphenol oxidase-mimicking probe, which provided a higher sensitivity than that of a peroxidase-like probe...
May 24, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29792665/highly-conductive-and-robust-3d-host-with-excellent-alkali-metal-infiltration-boosts-ultra-stable-lithium-and-sodium-metal-anodes
#4
Wan-Sheng Xiong, Yu Xia, Yun Jiang, Yuyang Qi, Weiwei Sun, Dan He, Yumin Liu, Xingzhong Zhao
The direct utilization of metallic lithium and sodium as the anodes for rechargeable batteries would be highly advantageous, which has been considered as one of the most promising choices for next-generation high-energy-density storage devices. Although the induced safety concerns, inferior rate and cycling performance severely hinder the commercialization of lithium-metal batteries (LMB) and sodium-metal batteries (SMB), the recent development of nanotechnology-based solutions really revives the lithium/sodium metal anodes for high-energy batteries...
May 24, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29791677/multifactorial-intervention-for-diabetes-control-among-older-users-of-insulin
#5
Rafael Vaz Machry, Henrique Umpierre Pedroso, Luthiele Silva Vasconcellos, Rafaela Ramos Nunes, Cibelle de Abreu Evaldt, Eduardo Bardou Yunes Filho, Ticiana da Costa Rodrigues
OBJECTIVE: To evaluate if the closer follow-up with the supply of insulin pens and the measurement of capillary blood glucose improve the management of older patients with type 2 diabetes without adequate glycemic control despite extensive therapy. METHODS: This is a prospective, non-randomized, quasi-experimental study. We have included 45 patients over 60 years old, from both sexes, with glycated hemoglobin (HbA1c) > 8.5% using oral hypoglycemic agents and insulin...
2018: Revista de Saúde Pública
https://www.readbyqxmd.com/read/29791609/association-between-multidrug-resistance-1-c3435t-gene-polymorphism-and-right-ventricular-dysfunction-in-patients-with-chronic-obstructive-pulmonary-disease-cross-sectional-study
#6
Oğuzhan Yücel, Hakan Güneş, Hasan Yücel, Ali Zorlu
BACKGROUND: Right ventricular (RV) dysfunction may develop over the course of chronic obstructive pulmonary disease (COPD) and is an important predictor of morbidity and mortality. Polymorphism of the multidrug resistance-1 (MDR-1) gene has been correlated with worse clinical findings among patients with COPD. Our aim here was to investigate the relationship between MDR-1 C3435T gene polymorphism and RV dysfunction in COPD patients. DESIGN AND SETTING: This was a cross-sectional study investigating the relationship between RV dysfunction and genetic defects in COPD patients...
March 2018: São Paulo Medical Journal, Revista Paulista de Medicina
https://www.readbyqxmd.com/read/29790876/novel-chemiluminescent-immunochromatographic-assay-using-a-dual-readout-signal-probe-for-multiplexed-detection-of-pesticide-residues
#7
Hui Ouyang, Wenwen Wang, Qi Shu, Zhifeng Fu
A novel immunochromatographic assay (ICA) using a dual-readout signal probe was developed for multiplexed detection of pesticide residues by adopting methyl parathion and fenpropathrin as model analytes. Luminol-reduced Au nanoparticles (LRAuNPs) were synthesized and utilized in the proposed ICA platform as a colorimetric/chemiluminescent (CL) dual-readout probe. The methyl parathion antibody and fenpropathrin antibody were tagged with the prepared LRAuNPs to conduct spatially-resolved multiplexed detection...
May 23, 2018: Analyst
https://www.readbyqxmd.com/read/29790775/dental-periodontal-and-salivary-conditions-in-diabetic-children-associated-with-metabolic-control-variables-and-nutritional-plan-adherence
#8
C Y Díaz Rosas, E Cárdenas Vargas, J E Castañeda-Delgado, L A Aguilera-Galaviz, M C Aceves Medina
AIM: Diabetes mellitus is a chronic disease that has manifestations other than alterations in endocrine regulation or in metabolic pathways. Several diseases of the oral cavity have been associated with diabetes mellitus type 1 and 2 in young people according to their evolution. Scarce information exists regarding the role of diabetes and its association with the oral health status in paediatric diabetic patients. The aims of the study were to assess the quality of saliva, saliva acidogenicity, dental caries experience, fluorosis and periodontal status in diabetic patients and to evaluate their relationship with metabolic control variables and nutritional plan adherence...
June 2018: European Journal of Paediatric Dentistry: Official Journal of European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/29790503/a-voltammetric-method-for-fe-iii-in-blood-serum-using-a-screen-printed-electrode-modified-with-a-schiff-base-ionophore
#9
Susheel K Mittal, Sonia Rana, Navneet Kaur, Craig E Banks
Herein, a potent electrochemical ionophore (SMS-2) based on a Schiff base has been used for the modification of a screen-printed electrode (SPE). The modified disposable electrode can selectively detect ferric ions in an aqueous medium. Redox behavior of the proposed strip was characterized using cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Incorporation of the ligand in the ink of the SPE enhanced the analytical performance of the electrode, and its surface modification was confirmed by SEM and EDX analysis...
May 23, 2018: Analyst
https://www.readbyqxmd.com/read/29790295/from-noise-to-knowledge-how-randomness-generates-novel-phenomena-and-reveals-information
#10
REVIEW
Carl Boettiger
Noise, as the term itself suggests, is most often seen a nuisance to ecological insight, a inconvenient reality that must be acknowledged, a haystack that must be stripped away to reveal the processes of interest underneath. Yet despite this well-earned reputation, noise is often interesting in its own right: noise can induce novel phenomena that could not be understood from some underlying deterministic model alone. Nor is all noise the same, and close examination of differences in frequency, colour or magnitude can reveal insights that would otherwise be inaccessible...
May 22, 2018: Ecology Letters
https://www.readbyqxmd.com/read/29790208/changes-in-nano-mechanical-properties-of-human-epidermal-cornified-cells-depending-on-their-proximity-to-the-skin-surface
#11
Pascale Milani, Julien Chlasta, Rawad Abdayem, Sanja Kezic, Marek Haftek
During formation of the stratum corneum (SC) barrier, terminally differentiated keratinocytes continue their maturation process within the dead superficial epidermal layer. Morphological studies of isolated human corneocytes have revealed differences between cornified envelopes purified from the deep and superficial SC. We used atomic force microscopy to measure the mechanical properties of native human corneocytes harvested by tape-stripping from different SC depths. Various conditions of data acquisition have been tested and optimized, in order to obtain exploitable and reproducible results...
May 22, 2018: Journal of Molecular Recognition: JMR
https://www.readbyqxmd.com/read/29789929/mechanistic-simulation-of-batch-acetone-butanol-ethanol-abe-fermentation-with-in-situ-gas-stripping-using-aspen-plus%C3%A2
#12
Kwabena Darkwah, Sue E Nokes, Jeffrey R Seay, Barbara L Knutson
Process simulations of batch fermentations with in situ product separation traditionally decouple these interdependent steps by simulating a separate "steady state" continuous fermentation and separation units. In this study, an integrated batch fermentation and separation process was simulated for a model system of acetone-butanol-ethanol (ABE) fermentation with in situ gas stripping, such that the fermentation kinetics are linked in real-time to the gas stripping process. A time-dependent cell growth, substrate utilization, and product production is translated to an Aspen Plus batch reactor...
May 22, 2018: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/29789188/fractures-after-multimodality-treatment-of-soft-tissue-sarcomas-with-isolated-limb-perfusion-and-radiation-likely-to-occur-and-hard-to-heal
#13
J M Seinen, P C Jutte, L B Been, E Pras, H J Hoekstra
OBJECTIVES: Treatment associated fractures (TAFs) are known severe side effects after surgery and radiotherapy for soft tissue sarcoma (STS). There is no literature about TAF after multimodality treatment with isolated limb perfusion (ILP) for locally advanced STS. This study aimed to analyze predictive factors, treatment and outcome for TAF after multimodality treatment with ILP. METHOD: Out of 126 consecutive patients undergoing ILP after 1991 till now, 25 patients were excluded due to no surgery or direct amputation at initial surgery...
April 24, 2018: European Journal of Surgical Oncology
https://www.readbyqxmd.com/read/29787628/electrolyte-chemistry-for-simultaneous-stabilization-of-potassium-metal-and-superoxide-in-k-o%C3%A2-batteries
#14
Neng Xiao, Gerald Gourdin, Yiying Wu
In the superoxide batteries based on O2/O2- redox chemistry, identifying an electrolyte to stabilize both alkali metal and superoxide remains challenging due to their reactivity towards electrolyte components. Bis(fluorosulfonyl)imide (FSI-) has been recognized as a "magical anion" for passivating alkali metals. Herein, we illustrate the chemical reactions between FSI- and superoxide, and the resultant dilemma when considering an anode-compatible electrolyte vs. a cathode-compatible one in K-O2 batteries...
May 22, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29787360/myotarsal-flap-a-versatile-entity-for-lower-eyelid-reconstructions
#15
Hemant K Mehta
The purpose is to present a new surgical technique using myotarsal (MT) flap for reconstruction of small to subtotal full thickness defects - up to 8 mm in height - of lower eyelids, without needing concomitant supplementary procedures. MT flap consists of a 3 mm tarsal strip with attached levator complex. It does not have conjunctival lining or pedicle. Versatility of the flap extends to correction of mild to severe ptosis, and retraction of upper eyelids. This is a retrospective personal series of 163 patients, who underwent surgical reconstruction with MT flap overlaid with quilted skin graft (modified myotarsal flap) after excision of malignant tumours of lower eyelid...
June 2018: Orbit
https://www.readbyqxmd.com/read/29786956/rho-kinase-and-protein-kinase-c-pathways-are-responsible-for-enhanced-carbachol-contraction-in-permeabilized-detrusor-in-a-rat-model-of-cystitis
#16
Merve Denizalti, N Tugba Durlu-Kandilci, G Simsek, T Emrah Bozkurt, Inci Sahin-Erdemli
Interstitial cystitis is a syndrome characterized by detrusor overactivity and chronic inflammation of the bladder. The mechanisms responsible for the altered smooth muscle contractility remain poorly understood. The aim of the study was to investigate the role of intracellular signalling pathways in carbachol-induced detrusor contraction in a rat model of interstitial cystitis. Cyclophosphamide (150 mg/kg, dissolved in saline) was injected to rats (Sprague-Dawley, female, 200-250 g) intraperitoneally once a day on days 1, 4 and 7 to induce interstitial cystitis...
May 22, 2018: Basic & Clinical Pharmacology & Toxicology
https://www.readbyqxmd.com/read/29786713/in-situ-fabrication-of-hollow-zno-nc-polyhedra-from-zif-8-for-the-determination-of-trace-cd-ii
#17
Xueping Zhang, Qingqing Wang, Jing Li, Liang Huang, Dengbin Yu, Shaojun Dong
In this work, a novel electrochemical sensor for Cd(ii) detection with differential pulse anodic stripping voltammetry (DPASV) is fabricated based on hollow ZnO@nitrogen-doped carbon (H-ZnO@NC) polyhedra, which are prepared from ZIF-8 via in situ tannic acid etching and a subsequent calcination process. The as-obtained H-ZnO@NC exhibits a polyhedral morphology with a well-defined hollow structure and a uniform distribution of elements C, N, O, and Zn in the shell. The unique structure of H-ZnO@NC can provide an enlarged surface area and abundant active sites...
May 22, 2018: Analyst
https://www.readbyqxmd.com/read/29785630/calcium-channels-rho-kinase-protein-kinase-c-and-phospholipase-c-pathways-mediate-mercury-chloride-induced-myometrial-contractions-in-rats
#18
Swati Koli, Atul Prakash, Soumen Choudhury, Rajesh Mandil, Satish K Garg
Adverse effects of mercury on female reproduction are reported; however, its effect on myogenic activity of uterus and mechanism thereof is obscure. Present study was undertaken to unravel the mechanistic pathways of mercuric chloride (HgCl2 )-induced myometrial contraction in rats. Isometric tension in myometrial strips of rats following in vitro exposure to HgCl2 was recorded using data acquisition system-based physiograph. HgCl2 produced concentration-dependent (10 nM-100 μM) uterotonic effect which was significantly (p < 0...
May 21, 2018: Biological Trace Element Research
https://www.readbyqxmd.com/read/29783728/a-3d-printed-multichannel-viscometer-for-high-throughput-analysis-of-frying-oil-quality
#19
Sein Oh, Byeongyeon Kim, Sungyoung Choi
Viscosity as a sensitive measure of material changes is a potential quality-control parameter for simple and rapid assessment of frying oil quality. However, conventional viscometers require improvements in throughput, portability, cost-effectiveness and usability to be widely adopted for quality-control applications. Here we present a 3D-printed multichannel viscometer for simple, inexpensive and multiplexed viscosity measurement. The multichannel viscometer enables both parallel actuation of multiple fluid flows by pressing the plunger of the viscometer by hand and direct measurement of their relative volumes dispensed with naked eye...
May 19, 2018: Sensors
https://www.readbyqxmd.com/read/29782895/detection-of-il-36y-via-non-invasive-tape-stripping-reliably-discriminates-psoriasis-from-atopic-eczema
#20
Anna Berekméri, Anne Latzko, Adewonuola Alase, Tom Macleod, Joseph S Ainscough, Philip Laws, Mark Goodfield, Andrew Wright, Philip Helliwell, Sara Edward, Gordon D Brown, Delyth M Reid, Joerg Wenzel, Martin Stacey, Miriam Wittmann
This report demonstrates that sampling and detection of IL-36γ protein by non-invasive tape stripping of skin lesion provides a highly sensitive and selective diagnostic for psoriatic inflammation.
May 18, 2018: Journal of Allergy and Clinical Immunology
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