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https://www.readbyqxmd.com/read/28637351/tuning-surface-chemistry-of-polyetheretherketone-by-gold-coating-and-plasma-treatment
#1
Zdeňka Novotná, Silvie Rimpelová, Petr Juřík, Martin Veselý, Zdeňka Kolská, Tomáš Hubáček, Jakub Borovec, Václav Švorčík
Polyetheretherketone (PEEK) has good chemical and biomechanical properties that are excellent for biomedical applications. However, PEEK exhibits hydrophobic and other surface characteristics which cause limited cell adhesion. We have investigated the potential of Ar plasma treatment for the formation of a nanostructured PEEK surface in order to enhance cell adhesion. The specific aim of this study was to reveal the effect of the interface of plasma-treated and gold-coated PEEK matrices on adhesion and spreading of mouse embryonic fibroblasts...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28637348/hydrogen-peroxide-sensing-based-on-inner-surfaces-modification-of-solid-state-nanopore
#2
Libo Zhu, Dejian Gu, Quanjun Liu
There are many techniques for the detection of molecules. But detection of molecules through solid-state nanopore in a solution is one of the promising, high-throughput, and low-cost technology used these days. In the present investigation, a solid-state nanopore platform was fabricated for the detection of hydrogen peroxide (H2O2), which is not only a label free product but also a significant participant in the redox reaction. We have successfully fabricated silicon nitride (Si3N4) nanopores with diameters of ~50 nm by using a focused Ga ion beam, the inner surface of the nanopore has been modified with horseradish peroxidase (HRP) by employing carbodiimide coupling chemistry...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28637335/astrocyte-produced-mir-146a-as-a-mediator-of-motor-neuron-loss-in-spinal-muscular-atrophy
#3
Samantha L Sison, Teresa N Patitucci, Emily R Seminary, Eric Villalon, Christian L Lorson, Allison D Ebert
Spinal muscular atrophy (SMA), the leading genetic cause of infant mortality, is caused by loss of the survival motor neuron-1 (SMN1) gene, which leads to motor neuron loss, muscle atrophy, respiratory distress, and death. Motor neurons exhibit the most profound loss, but the mechanisms underlying disease pathogenesis are not fully understood. Recent evidence suggests that motor neuron extrinsic influences, such as those arising from astrocytes, contribute to motor neuron malfunction and loss. Here we investigated both loss-of-function and toxic gain-of-function astrocyte mechanisms that could play a role in SMA pathology...
June 15, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/28637330/occurrence-of-aminoglycoside-modifying-enzymes-ames-among-isolates-of-escherichia-coli-exhibiting-high-levels-of-aminoglycoside-resistance-isolated-from-korean-cattle-farms
#4
Kuastros Mekonnen Belaynehe, Seung Won Shin, Park Hong-Tae, Han Sang Yoo
This study investigated 247 Escherichia coli isolates collected from four cattle farms to characterize aminoglycoside-modifying enzyme (AME) genes, their plasmid replicons and transferability. Out of 247 isolates a high number of isolates (total 202; 81.78%) were found resistant to various antibiotics by disc-diffusion. Of the 247 strains 139 (56.3%) were resistant to streptomycin and other antibiotics resistance followed as tetracycline (12.15%), ampicillin (7%), chloramphenicol (5.7%) and trimethoprim-sulfamethoxazole (0...
June 15, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28637329/health-benefits-associated-with-three-helping-behaviors-evidence-for-incident-cardiovascular-disease
#5
Jeffrey A Burr, Saehwang Han, Hyo Jung Lee, Jane L Tavares, Jan E Mutchler
Objective: The purpose of this study was to investigate the association between three helping behaviors and incident cardiovascular disease (CVD; heart attack, stroke; fatal and nonfatal), with an exploration of gender differences. The study is framed within the caregiving system model. Helping others is argued to be an evolved characteristic of humans that yields beneficial health effects. Methods: Data were taken from the 2004-2014 waves of the Health and Retirement Study...
June 16, 2017: Journals of Gerontology. Series B, Psychological Sciences and Social Sciences
https://www.readbyqxmd.com/read/28637319/matrix-metalloproteinases-their-functional-role-in-lung-cancer
#6
Neha Merchant, Ganji Purnachandra Nagaraju, Balney Rajitha, Saipriya Lammata, Kishore Kumar Jella, Zachary S Buchwald, Sajani S Lakka, Arif N Ali
Lung malignancy is the foremost cause of cancer-related deaths globally and is frequently related to long-term tobacco smoking. Recent studies reveal that the expression of matrix metalloproteinases (MMPs) is extremely high in lung tumors compared to non-malignant lung tissue. MMPs are zinc-dependent proteases and are involved in the degradation of extracellular matrix (ECM). Several investigations have shown that MMPs manipulate the activity of non-ECM molecules, including cytokines, growth factors and receptors which control the tumor microenvironment...
June 16, 2017: Carcinogenesis
https://www.readbyqxmd.com/read/28637318/experience-dependent-regulation-of-cajal-retzius-cell-networks-in-the-developing-and-adult-mouse-hippocampus
#7
Max Anstötz, Sun Kyong Lee, Tamra I Neblett, Gabriele M Rune, Gianmaria Maccaferri
In contrast to their near-disappearance in the adult neocortex, Cajal-Retzius cells have been suggested to persist longer in the hippocampus. A distinctive feature of the mature hippocampus, not maintained by other cortical areas, is its ability to sustain adult neurogenesis. Here, we have investigated whether environmental manipulations affecting hippocampal postnatal neurogenesis have a parallel impact on Cajal-Retzius cells. We used multiple mouse reporter lines to unequivocally identify Cajal-Retzius cells and quantify their densities during postnatal development...
June 16, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28637305/left-atrial-structure-and-function-in-cardiac-amyloidosis
#8
Kotaro Nochioka, Candida Cristina Quarta, Brian Claggett, Gabriela Querejeta Roca, Claudio Rapezzi, Rodney H Falk, Scott D Solomon
Aims: Although cardiac amyloidosis (CA) is characterized by significant left atrial (LA) dilatation, the characteristics of LA function remain to be fully investigated. Methods and results: We assessed LA function by speckle-tracking echocardiography in 124 patients with CA and sinus rhythm: 68 with light chain (AL), 29 with mutant (ATTRm), 27 with wild-type (ATTRwt) transthyretin amyloidosis. Conventional and strain-derived parameters, including LA peak longitudinal strain (LS) and strain rate (peak LSR: reservoir function; early LSR: conduit function; late LSR: active function), were assessed compared between CA patients and 20 healthy controls of similar age and gender...
June 16, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28637300/commercial-rodent-diets-differentially-regulate-autoimmune-glomerulonephritis-epigenetics-and-microbiota-in-mrl-lpr-mice
#9
Michael R Edwards, Rujuan Dai, Bettina Heid, Thomas E Cecere, Deena Khan, Qinghui Mu, Catharine Cowan, Xin M Luo, S Ansar Ahmed
The course and severity of lupus in spontaneous murine lupus models varies among laboratories, which may be due to variations in diet, housing and/or local environmental conditions. In this study, we investigated the influence of common rodent diets while keeping other factors constant. Female lupus-prone MRL/lpr mice were subjected to the same housing conditions and given one of the three diets: Teklad 7013 containing isoflavone rich soy and alfalfa, Harlan 2018 isoflavone rich soy-based diet, or ResearchDiets Inc...
June 15, 2017: International Immunology
https://www.readbyqxmd.com/read/28637299/serological-investigation-of-mycoplasma-synoviae-infection-in-china-from-2010-to-2015
#10
J Xue, M Y Xu, Z J Ma, J Zhao, N Jin, G Z Zhang
Mycoplasma synoviae can cause worldwide respiratory diseases, synovitis, or subclinical symptoms in poultry. M. synoviae infection occurs throughout the yr and causes significant economic losses, including increased mortality, condemnations, medication, and live production cost. In the present study, the seroprevalence of M. synoviae among 44,395 non-vaccinated chickens from 21 provinces in China from 2010 to 2015 was estimated using ELISA. The overall seroprevalence was 41.19%. Seropositive rates in different yr ranged between 24...
June 15, 2017: Poultry Science
https://www.readbyqxmd.com/read/28637279/high-dimensional-multivariate-mediation-with-application-to-neuroimaging-data
#11
Oliver Y Chén, Ciprian Crainiceanu, Elizabeth L Ogburn, Brian S Caffo, Tor D Wager, Martin A Lindquist
Mediation analysis is an important tool in the behavioral sciences for investigating the role of intermediate variables that lie in the path between a treatment and an outcome variable. The influence of the intermediate variable on the outcome is often explored using a linear structural equation model (LSEM), with model coefficients interpreted as possible effects. While there has been significant research on the topic, little work has been done when the intermediate variable (mediator) is a high-dimensional vector...
June 15, 2017: Biostatistics
https://www.readbyqxmd.com/read/28637274/association-of-bariatric-surgery-with-risk-of-infectious-diseases-a-self-controlled-case-series-analysis
#12
Tadahiro Goto, Atsushi Hirayama, Mohammad Kamal Faridi, Carlos A Camargo, Kohei Hasegawa
Background: Although emerging data demonstrate that obesity is a risk factor for infectious diseases, no study has investigated the relationship of bariatric surgery with the risk of infectious diseases among obese adults. Methods: We conducted a self-controlled case series analysis using data from the State Emergency Department Database and State Inpatient Database of three US states (California, Florida, and Nebraska) from 2005 through 2011. We included obese adults who underwent bariatric surgery as an instrument of weight reduction...
June 16, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28637271/logical-issues-with-the-pressure-natriuresis-theory-of-chronic-hypertension
#13
Theodore W Kurtz, Stephen E DiCarlo, R Curtis Morris
The term "abnormal pressure natriuresis" refers to a subnormal effect of a given level of blood pressure (BP) on sodium excretion. It is widely believed that abnormal pressure natriuresis causes an initial increase in BP to be sustained. We refer to this view as the "pressure natriuresis theory of chronic hypertension." The proponents of the theory contend that all forms of chronic hypertension are sustained by abnormal pressure natriuresis, irrespective of how hypertension is initiated. This theory would appear to follow from "the three laws of long-term arterial pressure regulation" stated by Guyton and Coleman more than 3 decades ago...
December 1, 2016: American Journal of Hypertension
https://www.readbyqxmd.com/read/28637270/in-planta-recapitulation-of-isoprene-synthases-evolution-from-ocimene-synthases
#14
Mingai Li, Jia Xu, Alberto Algarra Alarcon, Silvia Carlin, Enrico Barbaro, Luca Cappellin, Violeta Velikova, Urska Vrhovsek, Francesco Loreto, Claudio Varotto
Isoprene is the most abundant biogenic volatile hydrocarbon compound naturally emitted by plants and plays a major role in atmospheric chemistry. It has been proposed that isoprene synthases (IspS) may readily evolve from other terpene synthases, but this hypothesis has not been experimentally investigated.We isolated and functionally validated in Arabidopsis the first isoprene synthase gene, AdoIspS, from a monocotyledonous species (Arundo donax L., Poaceae). Phylogenetic reconstruction indicates that AdoIspS and dicots isoprene synthases most likely originated by parallel evolution from TPS-b monoterpene synthases...
June 16, 2017: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/28637252/wheat-seed-weight-and-quality-differ-temporally-in-sensitivity-to-warm-or-cool-conditions-during-seed-development-and-maturation
#15
M Nasehzadeh, R H Ellis
Background and aims: Short periods of extreme temperature may affect wheat ( Triticum aestivum ) seed weight, but also quality. Temporal sensitivity to extreme temperature during seed development and maturation was investigated. Methods: Plants of 'Tybalt' grown at ambient temperature were moved to growth cabinets at 29/20 °C or 34/20 °C (2010), or 15/10 °C or 34/20 °C (2011), for successive 7-d periods from 7 DAA (days after anthesis) onwards, and also 7-65 DAA in 2011...
June 15, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28637248/expression-and-comparison-of-codon-optimised-aspergillus-tubingensis-amylase-variants-in-saccharomyces-cerevisiae
#16
Rosemary A Cripwell, Shaunita H Rose, Willem H van Zyl
The expression of codon optimised genes is a popular genetic engineering approach for the production of industrially relevant proteins. This study investigates and compares the expression of codon optimised and codon adapted amylase variants. The Aspergillus tubingensis raw starch hydrolysing α-amylase (amyA) and glucoamylase (glaA) encoding genes were redesigned using synonymous codons and expressed in S. cerevisiae Y294. Codon optimisation to favour S. cerevisiae codon bias resulted in a decrease in extracellular enzyme activity of 72% (30...
June 15, 2017: FEMS Yeast Research
https://www.readbyqxmd.com/read/28637246/effect-of-psilocybin-on-empathy-and-moral-decision-making
#17
Thomas Pokorny, Katrin H Preller, Michael Kometer, Isabel Dziobek, Franz X Vollenweider
Background: Impaired empathic abilities lead to severe negative social consequences and influence the development and treatment of several psychiatric disorders. Furthermore, empathy has been shown to play a crucial role in moral and prosocial behaviour. Although the serotonin (5-HT) system has been implicated in modulating empathy and moral behaviour, the relative contribution of the various 5-HT receptor subtypes is still unknown. Methods: We investigated the acute effect of psilocybin (0...
June 16, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28637238/chlamydia-trachomatis-seroprevalence-and-ultrasound-diagnosed-uterine-fibroids-in-a-large-population-of-young-african-american-women
#18
Kristen R Moore, Jennifer S Smith, Stephen R Cole, Dirk P Dittmer, Victor J Schoenbach, Donna D Baird
Reproductive tract infections have long been hypothesized to increase fibroid risk. Few studies have been conducted, even for the common infection, genital Chlamydia trachomatis (gCT), and only with self-reported gCT data. Our investigation used micro-immunofluorescence serology for gCT to characterize past exposure. We used cross-sectional enrollment data from a prospective fibroid study in the Detroit, Michigan area; ultrasound examinations systematically screened for fibroids. Participants were African-American women ages 23-34 (recruited 2010-2012)...
June 16, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28637225/characteristics-of-escherichia-coli-isolated-from-broiler-chickens-with-colibacillosis-in-commercial-farms-from-a-common-hatchery
#19
H Ozaki, Y Matsuoka, E Nakagawa, T Murase
To investigate the epidemiologic aspects of colibacillosis in broiler chickens, 83 Escherichia coli isolates obtained from the pericarditis and perihepatitis lesions in broiler chickens from 4 commercial farms, 5 isolates recovered from 5 samples of yolk sac contents that were pooled from 25 emaciated chicks, and 4 fecal isolates obtained from a hatchery that supplied chicks to the 4 commercial farms mentioned above were genetically and bacteriologically characterized. Using pulsed-field gel electrophoresis (PFGE), a total of 92 isolates were classified into 33 pulsotypes...
June 20, 2017: Poultry Science
https://www.readbyqxmd.com/read/28637224/impact-of-a-macleaya-cordata-derived-alkaloid-extract-on-necrotic-enteritis-in-broilers
#20
G D Xue, S B Wu, M Choct, A Pastor, T Steiner, R A Swick
Necrotic enteritis (NE) causes significant economic losses in the broiler chicken industry, especially in birds raised without in-feed antibiotics. A standardized blend of plant-derived isoquinoline alkaloids (IQA) derived from Macleaya cordata has shown to have anti-inflammatory potency and promoted animal productivity. This study investigated the effects of IQA supplementation on broiler chickens under NE challenge. A 2 × 2 factorial arrangement of treatments was employed with factors: NE challenge (no or yes), and additives (no additive or IQA at 0...
June 20, 2017: Poultry Science
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