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https://www.readbyqxmd.com/read/28532123/origin-of-dislocation-luminescence-centers-and-their-reorganization-in-p-type-silicon-crystal-subjected-to-plastic-deformation-and-high-temperature-annealing
#1
Bohdan Pavlyk, Markiyan Kushlyk, Dmytro Slobodzyan
Changes of the defect structure of silicon p-type crystal surface layer under the influence of plastic deformation and high temperature annealing in oxygen atmosphere were investigated by deep-level capacitance-modulation spectroscopy (DLCMS) and IR spectroscopy of molecules and atom vibrational levels. Special role of dislocations in the surface layer of silicon during the formation of its energy spectrum and rebuilding the defective structure was established. It is shown that the concentration of linear defects (N ≥ 10(4) cm(-2)) enriches surface layer with electrically active complexes (dislocation-oxygen, dislocation-vacancy, and dislocation-interstitial atoms of silicon) which are an effective radiative recombination centers...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28532114/hypocrellin-b-and-nano-silver-loaded-polymeric-nanoparticles-enhanced-generation-of-singlet-oxygen-for-improved-photodynamic-therapy
#2
Subramanian Natesan, Venkateshwaran Krishnaswami, Chandrasekar Ponnusamy, Madi Madiyalakan, Thomas Woo, Rajaguru Palanisamy
A nanoparticulate photodynamic approach was employed with an objective to achieve enhanced production of singlet oxygen ((1)O2), for the management of posterior segment eye diseases like age related macular degeneration. The hypocrellin B (HB) loaded poly lactide-co-glycolide nanoparticle formulations were incorporated with nano silver (HBS-NPs). The optimized HBS-NPs contained 2.60±0.06mg/mL of HB and showed (i) 135.6 to 828.2nm size range, and (ii) negative zeta potential with a narrow polydispersity index...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532073/fabrication-of-vinyl-organosilicon-poly-n-n-4-5-dihydroxy-1-2-phenylene-bis-methylene-bisacrylamide-core-shell-antibacterial-agent
#3
Zhijia Zhang, Xiaole Zhao, Yingchun Su, Defeng Xing, Xiaojun Han
We demonstrate that antibacterial agent N, N'-[(4, 5-dihydroxy-1, 2-phenylene)bis(methylene)]bisacrylamide (OHABA) can be assembled on the surface of vinyl organosilicon nanospheres (VOSNs) by atom transfer radical polymerization (ATRP). Chemically cross-linked vinyl organosilicon cores were facilely fabricated by sol-gel method as support, which densely grafted poly-OHABA (POHABA) as shells. Antibacterial assessment test results revealed that POHABA-based core@shell structure displayed high antibacterial performance, long-term stability, and kept broad-spectrum antibacterial effect of against Gram-negative and Gram-positive bacteria...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532071/in-vitro-antibacterial-and-cytotoxic-activities-of-plasma-modified-polyethylene-terephthalate-nonwoven-dressing-with-aqueous-extract-of-rhizome-atractylodes-macrocephala
#4
Yi-Ting Shu, Kuo-Ting Kao, Ching-Sung Weng
In this study, a natural and non-cytotoxic antibacterial dressing containing aqueous extract of Rhizome Atractylodes macrocephala (RAM), which has been widely used in traditional herbal medicine and documented with antibacterial activities in literatures, was developed by aid of the extraction technique, nonwoven substrates and plasma-induced grafting technology. The effectiveness of these herbal antibacterial dressings with different treatment were investigated through the assays of grafting yield, SEM, FTIR, antibacterial activities and cytotoxicity...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532038/dynamic-covalent-linked-triblock-copolymer-micelles-for-glutathione-mediated-intracellular-drug-delivery
#5
Xueli Wang, Changyu He, Qinglai Yang, Lianjiang Tan, Bingya Liu, Zhenggang Zhu, Bing Gong, Yu-Mei Shen
Redox-responsive linkages dispersed in the backbones of the synthetic polymers, while young in the current spectrum of the biomedical application, are rapidly extending into their niche. In the present work, triblock copolymer PEG-PLA-PEG synthesized and characterized by (1)H -NMR and SEC can self-assemble into redox-responsive micelles in aqueous media with nanosized 33nm and 47nm. And the copolymers PEG2000-PLA3000-PEG2000 and PEG2000-PLA5000-PEG2000 present lower CMC with 0.034 and 0.022mg/mL, and higher DLC of 4...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531842/a-highly-selective-long-wavelength-fluorescent-probe-for-hydrazine-and-its-application-in-living-cell-imaging
#6
Yuanqiang Hao, Yintang Zhang, Kehong Ruan, Fanteng Meng, Ting Li, Jinsheng Guan, Lulu Du, Peng Qu, Maotian Xu
A highly selective long-wavelength turn-on fluorescent probe has been developed for the detection of N2H4. The probe was prepared by conjugation the tricyanofuran-based D-π-A system with a recognizing moiety of acetyl group. In the presence of N2H4, the probe can be effectively hydrazinolysized and produce a turn-on fluorescent emission at 610nm as well as a large red-shift in the absorption spectrum corresponding to a color change from yellow to blue. The sensing mechanism was confirmed by HPLC, MS, UV-vis, emission spectroscopic and theoretical calculation studies...
April 20, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28531352/conformational-complexity-in-the-lh2-antenna-of-the-purple-sulfur-bacterium-allochromatium-vinosum-revealed-by-hole-burning-spectroscopy
#7
Adam Kell, Mahboobe Jassas, Khem Acharya, Kirsty Hacking, Richard J Cogdell, Ryszard J Jankowiak
This work discusses the protein conformational complexity of the B800-850 LH2 complexes from the purple sulfur bacterium Allochromatium vinosum, focusing on the spectral characteristics of the B850 chromophores. Low-temperature B850 absorption and the split B800 band shift blue and red, respectively, at elevated temperatures, revealing isosbestic points. The latter indicates the presence of two (unresolved) conformations of B850 bacteriochlorophylls (BChls), referred to as conformations 1 and 2, and two conformations of B800 BChls, denoted as B800R and B800B...
May 22, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28531350/embedded-metal-electrode-for-organic-inorganic-hybrid-nanowire-solar-cells
#8
Han-Don Um, Deokjae Choi, Ahreum Choi, Ji Hoon Seo, Kwanyong Seo
We demonstrate here an embedded metal electrode for highly efficient organic-inorganic hybrid nanowire solar cells. The electrode proposed here is an effective alternative to the conventional bus and finger electrode which leads to a localized short circuit at a direct Si/metal contact and has a poor collection efficiency due to a nonoptimized electrode design. In our design, an Ag/SiO2 electrode is embedded into a Si substrate while being positioned between Si nanowire (SiNW) arrays underneath poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), facilitating suppressed recombination at the Si/Ag interface and notable improvements in the fabrication reproducibility...
May 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28531348/plant-derived-transcription-factors-for-orthologous-regulation-of-gene-expression-in-the-yeast-saccharomyces-cerevisiae
#9
Gita Naseri, Salma Balazadeh, Fabian Machens, Iman Kamranfar, Katrin Messerschmidt, Bernd Mueller-Roeber
Control of gene expression by transcription factors (TFs) is central in many synthetic biology projects where tailored expression of one or multiple genes is often needed. As TFs from evolutionary distant organisms are unlikely to affect gene expression in a host of choice, they represent excellent candidates for establishing orthogonal control systems. To establish orthogonal regulators for use in yeast (Saccharomyces cerevisiae), we chose TFs from the plant Arabidopsis thaliana. We established a library of 106 different combinations of chromosomally integrated TFs, activation domains (yeast GAL4 AD, herpes simplex virus VP64, and plant EDLL) and synthetic promoters harbouring cognate cis-regulatory motifs driving a yEGFP reporter...
May 22, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28530752/active-metal-template-synthesis-of-a-neutral-indolocarbazole-containing-2-rotaxane-host-system-for-selective-oxoanion-recognition
#10
Asha Brown, Thomas Lang, Kathleen M Mullen, Paul D Beer
An active metal template strategy was used to synthesise a neutral indolocarbazole containing [2]rotaxane anion host system. (1)H NMR anion binding investigations reveal that the [2]rotaxane recognises a range of monoanions in acetone-d5 : D2O 95 : 5 with an unusual interlocked host selectivity for acetate and dihydrogenphosphate oxoanions over halides. The rotaxane displays an overall selectivity for the sulfate dianion, favouring a 2 : 1 host : guest binding stoichiometry at low sulfate concentration and a 1 : 1 stoichiometry in the presence of excess sulfate...
May 22, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28530490/role-of-continuous-glucose-monitoring-in-clinical-trials-recommendations-on-reporting
#11
Oliver Schnell, Katharine Barnard, Richard Bergenstal, Emanuele Bosi, Satish Garg, Bruno Guerci, Thomas Haak, Irl B Hirsch, Linong Ji, Shashank R Joshi, Maarten Kamp, Lori Laffel, Mathieu Chantal, William H Polonsky, Frank Snoek, Philip Home
Thanks to significant improvements in the precision, accuracy, and usability of continuous glucose monitoring (CGM), its relevance in both ambulatory diabetes care and clinical research is increasing. In this study, we address the latter perspective and derive provisional reporting recommendations. CGM systems have been available since around the year 2000 and used primarily in people with type 1 diabetes. In contrast to self-measured glucose, CGM can provide continuous real-time measurement of glucose levels, alerts for hypoglycemia and hyperglycemia, and a detailed assessment of glycemic variability...
May 22, 2017: Diabetes Technology & Therapeutics
https://www.readbyqxmd.com/read/28530441/a-pilot-observational-study-of-an-acupressure-acupuncture-intervention-in-children-with-autism-spectrum-disorder
#12
Lana R Warren, Patricia A Rao, David C Paton
OBJECTIVES: To determine whether children with autism spectrum disorder (ASD) would tolerate an acupressure/acupuncture intervention and whether parents would adhere to a twice-weekly, 8-week intervention protocol. Second, to further understand best measures to use to capture impact of intervention on behavioral and regulatory functions. DESIGN: This is an observational pilot study with pre-, mid-, and postintervention measures. SETTINGS/LOCATION: The intervention was carried out in a private practice office in a large metropolitan area...
May 22, 2017: Journal of Alternative and Complementary Medicine: Research on Paradigm, Practice, and Policy
https://www.readbyqxmd.com/read/28530404/role-of-crystallization-in-the-morphology-of-polymer-non-fullerene-acceptor-bulk-heterojunctions
#13
Kathryn A O'Hara, David P Ostrowski, Unsal Koldemir, Christopher J Takacs, Sean E Shaheen, Alan Sellinger, Michael L Chabinyc
Many high efficiency organic photovoltaics use fullerene-based acceptors despite their high production cost, weak optical absorption in the visible range, and limited synthetic variability of electronic and optical properties. To circumvent this deficiency, non-fullerene small-molecule acceptors have been developed that have good synthetic flexibility, allowing for precise tuning of optoelectronic properties, leading to enhanced absorption of the solar spectrum and increased open-circuit voltages (VOC). We examined the detailed morphology of bulk heterojunctions of poly(3-hexylthiophene) and the small-molecule acceptor HPI-BT to reveal structural changes that lead to improvements in the fill factor of solar cells upon thermal annealing...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28530395/rapid-detection-of-prosthetic-joint-infection-based-on-magnetically-assisted-surface-enhanced-raman-spectroscopy-ma-sers
#14
Ariana Fargasova, Anna Balzerova, Robert Prucek, Miroslava Htoutou Sedláková, Katerina Bogdanova, Jiri Gallo, Milan Kolar, Vaclav Ranc, Radek Zboril
Accurate and rapid diagnosis of prosthetic joint infection (PJI) is vital for rational and effective therapeutic management of this condition. Several diagnostic strategies have been developed for discriminating between infected and non-infected cases. However, none of them can reliably diagnose the whole spectrum of clinical presentations of PJI. Here we report a new method for PJI detection based on magnetically assisted surface enhanced Raman spectroscopy (MA-SERS) using streptavidin-modified magnetic nanoparticles (MNP@Strep) whose surface is functionalized with suitable biotinylated antibodies and then coated with silver nanoparticles by self-assembly...
May 22, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28530249/large-scale-quantum-emitter-arrays-in-atomically-thin-semiconductors
#15
Carmen Palacios-Berraquero, Dhiren M Kara, Alejandro R-P Montblanch, Matteo Barbone, Pawel Latawiec, Duhee Yoon, Anna K Ott, Marko Loncar, Andrea C Ferrari, Mete Atatüre
Quantum light emitters have been observed in atomically thin layers of transition metal dichalcogenides. However, they are found at random locations within the host material and usually in low densities, hindering experiments aiming to investigate this new class of emitters. Here, we create deterministic arrays of hundreds of quantum emitters in tungsten diselenide and tungsten disulphide monolayers, emitting across a range of wavelengths in the visible spectrum (610-680 nm and 740-820 nm), with a greater spectral stability than their randomly occurring counterparts...
May 22, 2017: Nature Communications
https://www.readbyqxmd.com/read/28530055/-pulmonary-fibrosis-induced-by-anti%C3%B6-tnf-%C3%AE-lpha-treatment
#16
Sharon Baum, Orit Schachter, Aviv Barzilai
INTRODUCTION: TNFα-targeted therapies have emerged as a new class of drugs in the treatment of various inflammatory diseases, including psoriasis. With the increasing use and longer follow-up periods of TNFα targeted therapies, a spectrum of immunological adverse events have been described, ranging from asymptomatic immunological alterations to life-threatening systemic diseases such as pulmonary fibrosis. We present a case of a 66 year old man diagnosed with psoriasis who developed pulmonary fibrosis three years after initiation of Etanercept (Enbrel) for his skin disease...
October 2016: Harefuah
https://www.readbyqxmd.com/read/28530050/-modern-over-the-good-and-old
#17
Sharon Baum, Aviv Barzilai
Modern dermatology is a reflection of the advances achieved in the general medical world. Thus, in recent years, dermatology encompasses many different fields and consequently, various subspecialties were created. In addition to dermatopathology and dermatosurgery, which are formal subspecialties, other fields of expertise include: autoimmune diseases, especially bullous diseases, hair and nail disorders, allergic diseases, infectious diseases and pigmented lesion clinics and oncodermatology. This current issue of "Harefuah" incorporates research and review articles from experts of the different subspecialties mentioned...
October 2016: Harefuah
https://www.readbyqxmd.com/read/28529976/de-novo-generation-and-characterization-of-new-zika-virus-isolate-using-sequence-data-from-a-microcephaly-case
#18
Yin Xiang Setoh, Natalie A Prow, Nias Peng, Leon E Hugo, Gregor Devine, Jessamine E Hazlewood, Andreas Suhrbier, Alexander A Khromykh
Zika virus (ZIKV) has recently emerged and is the etiological agent of congenital Zika syndrome (CZS), a spectrum of congenital abnormalities arising from neural tissue infections in utero. Herein, we describe the de novo generation of a new ZIKV isolate, ZIKVNatal, using a modified circular polymerase extension reaction protocol and sequence data obtained from a ZIKV-infected fetus with microcephaly. ZIKVNatal thus has no laboratory passage history and is unequivocally associated with CZS. ZIKVNatal could be used to establish a fetal brain infection model in IFNAR(-/-) mice (including intrauterine growth restriction) without causing symptomatic infections in dams...
May 2017: MSphere
https://www.readbyqxmd.com/read/28529938/senescence-inflammatory-regulation-of-reparative-cellular-reprogramming-in-aging-and-cancer
#19
Javier A Menendez, Tomás Alarcón
The inability of adult tissues to transitorily generate cells with functional stem cell-like properties is a major obstacle to tissue self-repair. Nuclear reprogramming-like phenomena that induce a transient acquisition of epigenetic plasticity and phenotype malleability may constitute a reparative route through which human tissues respond to injury, stress, and disease. However, tissue rejuvenation should involve not only the transient epigenetic reprogramming of differentiated cells, but also the committed re-acquisition of the original or alternative committed cell fate...
2017: Frontiers in Cell and Developmental Biology
https://www.readbyqxmd.com/read/28529928/the-probiotic-compound-vsl-3-modulates-mucosal-peripheral-and-systemic-immunity-following-murine-broad-spectrum-antibiotic-treatment
#20
Ira Ekmekciu, Eliane von Klitzing, Ulrike Fiebiger, Christian Neumann, Petra Bacher, Alexander Scheffold, Stefan Bereswill, Markus M Heimesaat
There is compelling evidence linking the commensal intestinal microbiota with host health and, in turn, antibiotic induced perturbations of microbiota composition with distinct pathologies. Despite the attractiveness of probiotic therapy as a tool to beneficially alter the intestinal microbiota, its immunological effects are still incompletely understood. The aim of the present study was to assess the efficacy of the probiotic formulation VSL#3 consisting of eight distinct bacterial species (including Streptococcus thermophilus, Bifidobacterium breve, B...
2017: Frontiers in Cellular and Infection Microbiology
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