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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/28637349/the-antibacterial-polyamide-6-zno-hierarchical-nanofibers-fabricated-by-atomic-layer-deposition-and-hydrothermal-growth
#2
Zhengduo Wang, Li Zhang, Zhongwei Liu, Lijun Sang, Lizhen Yang, Qiang Chen
In this paper, we report the combination of atomic layer deposition (ALD) with hydrothermal techniques to deposit ZnO on electrospun polyamide 6 (PA 6) nanofiber (NF) surface in the purpose of antibacterial application. The micro- and nanostructures of the hierarchical fibers are characterized by field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HRTEM), and scanning transmission electron microscopy (STEM). We find that NFs can grow into "water lily"- and "caterpillar"-like shapes, which depend on the number of ALD cycles and the hydrothermal reaction period...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28637348/hydrogen-peroxide-sensing-based-on-inner-surfaces-modification-of-solid-state-nanopore
#3
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/28637339/emergence-of-ceftazidime-avibactam-non-susceptibility-in-an-mdr-klebsiella-pneumoniae-isolate
#4
Anna Both, Henning Büttner, Jiabin Huang, Markus Perbandt, Cristina Belmar Campos, Martin Christner, Florian P Maurer, Stefan Kluge, Christina König, Martin Aepfelbacher, Dominic Wichmann, Holger Rohde
Background: Avibactam is a novel broad-range β-lactamase inhibitor active against Ambler class A (including ESBL and KPC) and some Ambler class C and D (e.g. OXA-48) enzymes. We here report on the emergence of ceftazidime/avibactam resistance in clinical, multiresistant, OXA-48 and CTX-M-14-producing Klebsiella pneumoniae isolate DT12 during ceftazidime/avibactam treatment. Methods and results: Comparative whole-genome sequence analysis identified two SNPs in the CTX-M-14-encoding gene leading to two amino acid changes (P170S and T264I)...
June 16, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28637324/the-effects-of-phytosterols-on-the-sexual-behavior-and-reproductive-function-in-the-japanese-quail-coturnix-coturnix-japonica
#5
Mohammad Ibrahim Qasimi, Kentaro Nagaoka, Gen Watanabe
Phytosterols (PS) are plant origin sterols naturally found in many foods and added as food additives. Since 1950, PS have attracted considerable attention due to their ability to lower serum cholesterol and inhibit cardiovascular disease (CVD). However, recent studies have found that PS act as endocrine-disrupting chemicals in laboratory animals. Therefore, this study was aimed at finding the mechanism(s) for PS effects on the sexual behaviors and reproductive functions in male Japanese quails (Coturnix coturnix japonica)...
June 16, 2017: Poultry Science
https://www.readbyqxmd.com/read/28637270/in-planta-recapitulation-of-isoprene-synthases-evolution-from-ocimene-synthases
#6
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/28637253/synthesis-and-secretion-of-isoflavones-by-field-grown-soybean
#7
Akifumi Sugiyama, Yumi Yamazaki, Shoichiro Hamamoto, Hisabumi Takase, Kazufumi Yazaki
Isoflavones play important roles in rhizosphere plant-microbe interactions. Daidzein and genistein secreted by soybean roots induce the symbiotic interaction with rhizobia and may modulate rhizosphere interactions with microbes. Yet despite their important roles, little is known about the biosynthesis, secretion and fate of isoflavones in field-grown soybeans. Here, we analysed isoflavone contents and the expression of isoflavone biosynthesis genes in field-grown soybeans. In roots, isoflavone contents and composition did not change with crop growth, but the expressions of UGT4, an isoflavone-specific 7-O-glucosyltransferase, and of ICHG (Isoflavone conjugates hydrolysing beta-glucosidase) was decreased during the reproductive stages...
June 16, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/28637248/expression-and-comparison-of-codon-optimised-aspergillus-tubingensis-amylase-variants-in-saccharomyces-cerevisiae
#8
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/28637199/first-ex-vivo-and-preliminary-sheep-model-results-of-the-new-tribio-aortic-valve-bioprosthesis-in-small-aortic-annuli
#9
Sina Stock, Hans-Hinrich Sievers, Doreen Richardt, Michael Scharfschwerdt
OBJECTIVES: : Small aortic annuli are challenging in aortic valve replacement. Prosthesis-patient mismatch, accompanied by high transvalvular gradients and small orifice area, is an often faced problem impairing postoperative outcome. The new TRIBIO bioprosthesis aims to enable enhanced haemodynamics, being increasingly important with decreasing annular size. This study compares ex vivo hydrodynamics of TRIBIO with 2 established bioprostheses in small annuli at different stroke volumes, simulating 'rest' and 'exercise', and evaluates haemodynamics of TRIBIO in a sheep model...
June 20, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28637176/dissociation-of-striatal-dopamine-and-tyrosine-hydroxylase-expression-from-aging-related-motor-decline-evidence-from-calorie-restriction-intervention
#10
Michael F Salvatore, Jennifer Terrebonne, Mark A Cantu, Tamara R McInnis, Katy Venable, Parker Kelley, Ella A Kasanga, Brian Latimer, Catherine L Owens, Brandon S Pruett, Yongmei Yu, Robert Luedtke, Michael J Forster, Nathalie Sumien, Donald K Ingram
The escalating increase in retirees living beyond their 8th decade brings increased prevalence of aging-related impairments, including locomotor impairment (Parkinsonism) which may affect ~50% of those reaching age 80, but has no confirmed neurobiological mechanism. Lifestyle strategies that attenuate motor decline, and its allied mechanisms, must be identified. Aging studies report little to moderate loss of striatal dopamine (DA) or tyrosine hydroxylase (TH) in nigrostriatal terminals, in contrast to ~70-80% loss associated with bradykinesia onset in Parkinson's disease...
June 20, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28637173/crystallographic-analyses-illustrate-significant-plasticity-and-efficient-recoding-of-meganuclease-target-specificity
#11
Rachel Werther, Jazmine P Hallinan, Abigail R Lambert, Kyle Havens, Mark Pogson, Jordan Jarjour, Roberto Galizi, Nikolai Windbichler, Andrea Crisanti, Tony Nolan, Barry L Stoddard
The retargeting of protein-DNA specificity, outside of extremely modular DNA binding proteins such as TAL effectors, has generally proved to be quite challenging. Here, we describe structural analyses of five different extensively retargeted variants of a single homing endonuclease, that have been shown to function efficiently in ex vivo and in vivo applications. The redesigned proteins harbor mutations at up to 53 residues (18%) of their amino acid sequence, primarily distributed across the DNA binding surface, making them among the most significantly reengineered ligand-binding proteins to date...
June 20, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28637168/sulfur-balance-of-sulfur-dioxide-ethanol-water-fractionation-of-sugarcane-straw
#12
Xiang You, Adriaan van Heiningen, Herbert Sixta, Mikhail Iakovlev
The sulfur balance of SO2-ethanol-water (AVAP®) fractionation of sugarcane (SC) straw was investigated. Hydrogen sulfite and sulfite anions are nearly absent in the liquors, despite cations present in straw, whose effect is thus limited to neutralization of lignosulfonic acids decreasing the acidity. Higher degree of sulfonation was observed for dissolved straw lignin compared to wood lignin (0.8-0.9 vs. 0.25 S/C9). Sulfur dioxide amounts of 0.9-1.2, 4.1-4.3 and 44-49g per o.d.kg straw were bound to pulp, precipitated lignin and lignosulfonic acid, respectively, while the rest of SO2 was recovered by distillation from the spent fractionation suspensions...
June 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28637162/response-of-antimicrobial-nitrofurazone-degrading-biocathode-communities-to-different-cathode-potentials
#13
Deyong Kong, Hui Yun, Dan Cui, Mengyuan Qi, Chunyan Shao, Dichen Cui, Nanqi Ren, Bin Liang, Aijie Wang
Bioelectrodegradation of various organic pollutants has been extensively studied. However, whether different cathode potentials could alter the antimicrobial-degrading biocathode community structure and composition remain poorly understood. Here, the microbial community structure and composition of the nitrofurans nitrofurazone (NFZ) degrading biocathode in response to different cathode potentials (-0.45±0.01, -0.65±0.01 and -0.86±0.05V vs standard hydrogen electrode, with applied cell voltages of 0.2, 0...
June 13, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28637161/sequential-batch-thermophilic-solid-state-anaerobic-digestion-of-lignocellulosic-biomass-via-recirculating-digestate-as-inoculum-part-ii-microbial-diversity-and-succession
#14
Long Lin, Zhongtang Yu, Yebo Li
This study aimed to investigate the effect of recirculation of digestate as inoculum on the microbial communities in thermophilic solid-state anaerobic digestion (SS-AD) of yard trimmings. The SS-AD consisted of 4 consecutive runs (30days/run), with digestate from the previous run being used as the inoculum of the subsequent run. Bacterial and archaeal communities (day 0, 4, 8, 12, 20, and 30) were examined using Illumina sequencing of 16S rRNA genes. The results revealed substantial microbial succession toward increased diversity until run 3...
June 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28637160/energy-producing-electro-flocculation-for-harvest-of-dunaliella-salina
#15
Qing Liu, Meng Zhang, Tao Lv, Hongjun Chen, Anthony Okonkwo Chika, Changli Xiang, Minxue Guo, Minghui Wu, Jianjun Li, Lishan Jia
In this study, an efficient electro-flocculation process for Dunaliella salina with energy production by aluminum-air battery has been successfully applied. The formed aluminum hydroxide hydrates during discharging of battery were positively charged, which have a great potential for microalgae flocculation. The precipitation of aluminum hydroxide hydrates by algae also could improve the performance of aluminum-air battery. The harvesting efficiency could reach 97% in 20mins with energy production of 0.11kWh/kg...
June 1, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28637081/molecular-characterization-of-gluten-hydrolyzing-bacillus-spp-and-their-efficacy-and-biotherapeutic-potential-as-probiotics-using-caco-2-cell-line
#16
B S Rashmi, Gayathri Devaraja
AIM: To isolate and characterize indigenous gluten hydrolyzing bacteria from wheat sourdough and curd samples and further evaluation of their probiotic potentiality. METHODS AND RESULTS: Indigenous gluten hydrolyzing isolates GS 33, GS 143, GS 181 and GS 188 were identified as Bacillus spp. by molecular-typing methods and studied extensively for their functional and probiotic attributes. All the tested isolates could survive at pH 2 and toxicity of 0.3% bile and also exhibited cell-surface hydrophobicity and autoaggregation phenotype...
June 21, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28637045/effects-of-injection-of-gamma-aminobutyric-acid-agonists-into-the-nucleus-accumbens-on-naloxone-induced-morphine-withdrawal
#17
Betilay Topkara, Hasan R Yananli, Eren Sakallı, Mehluge Caferova
AIMS: This study was to investigate the effects of local administration of gamma-aminobutyric acid (GABA) agonists into the nucleus accumbens (NAc) on naloxone-induced morphine withdrawal symptoms. METHODS: Bilateral guide cannulas were stereotaxically implanted in the shell or core regions of the NAc of Sprague-Dawley rats. After a recovery period, 3 morphine pellets, each consisting of 75 mg morphine base, were placed subcutaneously on the first and third days of the study with the rats under mild ether anaesthesia...
June 22, 2017: Pharmacology
https://www.readbyqxmd.com/read/28637041/the-effects-of-fungicides-on-human-3%C3%AE-hydroxysteroid-dehydrogenase-1-and-aromatase-in-human-placental-cell-line-jeg-3
#18
Shuyan Cao, Leping Ye, Ying Wu, Baiping Mao, Lanlan Chen, Xiudi Wang, Ping Huang, Ying Su, Ren-Shan Ge
Placenta secretes a large amount of progesterone and estradiol, which are critical for maintaining pregnancy. In human placenta, 3β-hydroxysteroid dehydrogenase 1 (HSD3B1) catalyzes pregnenolone to form progesterone, and aromatase (CYP19A1) catalyzes testosterone into estradiol. Fungicides display antifungal activities and are widely used to prevent fungal infections in agricultural plants. These chemicals include azoles, such as tebuconazole (TEB), triadimefon (TRI), and vinclozolin (VCZ) or organotins, such as tributyltin (TBT) and tetrabutyltin (TTBT)...
June 22, 2017: Pharmacology
https://www.readbyqxmd.com/read/28637020/autophagy-related-genes-are-induced-by-histone-deacetylase-inhibitor-suberoylanilide-hydroxamic-acid-via-the-activation-of-cathepsin-b-in-human-breast-cancer-cells
#19
Han Han, Jing Li, Xiuyan Feng, Hui Zhou, Shanchun Guo, Weiqiang Zhou
Autophagy is involved in modulating tumor cell motility and invasion, resistance to epithelial-to-mesenchymal transition, anoikis, and escape from immune surveillance. We have previous shown that SAHA is capable to induce several apoptosis and autophagy-related gene expression in breast cancers. However, the exact mechanisms of autophagy activation in this context have not been fully identified. Our results showed that the expression and the activity of Cathepsin B (CTSB), one of the major lysosomal cysteine proteases, were significantly increased in MDA-MB- 231 and MCF-7 cells upon SAHA treatment...
June 8, 2017: Oncotarget
https://www.readbyqxmd.com/read/28636951/structure-of-cc-chemokine-receptor-5-with-a-potent-chemokine-antagonist-reveals-mechanisms-of-chemokine-recognition-and-molecular-mimicry-by-hiv
#20
Yi Zheng, Gye Won Han, Ruben Abagyan, Beili Wu, Raymond C Stevens, Vadim Cherezov, Irina Kufareva, Tracy M Handel
CCR5 is the primary chemokine receptor utilized by HIV to infect leukocytes, whereas CCR5 ligands inhibit infection by blocking CCR5 engagement with HIV gp120. To guide the design of improved therapeutics, we solved the structure of CCR5 in complex with chemokine antagonist [5P7]CCL5. Several structural features appeared to contribute to the anti-HIV potency of [5P7]CCL5, including the distinct chemokine orientation relative to the receptor, the near-complete occupancy of the receptor binding pocket, the dense network of intermolecular hydrogen bonds, and the similarity of binding determinants with the FDA-approved HIV inhibitor Maraviroc...
June 20, 2017: Immunity
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