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https://www.readbyqxmd.com/read/28324718/l-arginine-assisted-one-pot-synthesis-of-hierarchical-ag1pt2-nanocorallines-for-surface-enhanced-raman-spectroscopy
#1
Liu-Ying Jiang, Xin-Sheng Li, Ai-Jun Wang, Hong Huang, Jiu-Ju Feng
The hierarchical multi-branched Ag1Pt2 nanocorallines (NCs) were prepared in a large scale by a rapid aqueous method, using l-arginine as the eco-friendly shape-directing agent. The product was mainly characterized by microscopy measurements, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The architectures exhibited superior surface-enhanced Raman scattering (SERS) with 4-nitrothiophenol (4-NTP), the enhancement factor (EF) of 1.3×10(5), a wide linear range of 10-100μM and a low detection limit of 0...
March 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28324629/electrospun-nerve-guide-scaffold-of-poly-%C3%AE%C2%B5-caprolactone-collagen-nano-bioglass-an-in-vitro-study-in-peripheral-nerve-tissue-engineering
#2
Forouzan Mohamadi, Somayeh Ebrahimi-Barough, Mohammad Reza Nourani, Mohammad Ali Derakhshan, Vahabodin Goodarzi, Mohammad Sadegh Nazockdast, Mehdi Farokhi, Roksana Tajerian, Reza Faridi Majidi, Jafar Ai
In among of various methods, nerve tissue engineering (NTE) is one of the applicable methods to reconstruct damaged nerve tissues. Electrospinning technique and biomaterials are often considered to fabricate fibrous tissue engineered conduits which have great similarity to the extracellular matrix on fiber structure. Polymer blending is one of the most effective methods for production of new materials with outstanding features. In this research, conduit structures as main part of the peripheral nerve regeneration based on polymer blend nanocomposites PCL/Collagen/NBG (poly (ε-caprolactone)/Collagen/nano bioglass) were manufactured by electrospinning technique...
March 21, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28324621/quantum-chemical-dissection-of-the-shortest-p-o%C3%A2-%C3%A2-%C3%A2-i-halogen-bond-the-decisive-role-of-crystal-packing-effects
#3
Milan Kivala, Tobias A Schaub, Rebecca Sure, Frank Hampel, Stefan Grimme
We report on a supramolecular arrangement comprising a bridged triarylphoshine oxide and an aryl iodide that features the shortest ever reported P=O···I halogen bond of 2.683(5) Å in the solid state. X-ray crystallographic analysis together with modern quantum chemical methods were enlisted to dissect the individual contributions that compelled this exceptionally short halogen bond pointing out the decisive role of crystal packing effects.
March 21, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28324508/in-vitro-preparation-and-crystallization-of-vertebrate-telomerase-subunits
#4
Jing Huang, Christopher J Bley, Dustin P Rand, Julian J L Chen, Ming Lei
Telomerase is a unique reverse transcriptase that replicates the telomeric DNA at most eukaryotic chromosomal ends. The telomerase consists of the catalytic protein subunit TERT and the RNA component TR that provides the template for telomeric DNA synthesis. In vitro reconstitution of telomerase core components in large quantity is the prerequisite to studying the catalytic mechanisms of telomerase at the structural level; however, large-scale preparation of recombinant telomerase, especially that of higher eukaryotes, has been a big challenge for a long time...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28324202/the-influence-of-surgical-approach-on-postoperative-pelvic-tilt-after-total-hip-arthroplasty
#5
Daisuke Inoue, Tamon Kabata, Yoshitomo Kajino, Tadashi Taga, Kazuhiro Hasegawa, Takashi Yamamoto, Tomoharu Takagi, Takaaki Ohmori, Hiroyuki Tsuchiya
BACKGROUND: Past reports have shown the tendency of posterior pelvic tilt to increase over time after total hip arthroplasty (THA). We have hypothesized that the volume and extent of released joint capsule may influence the change in postoperative pelvic tilt. This study was conducted to ascertain whether surgical approach during THA (posterior or anterior) has an effect on postoperative changes in pelvic tilt. METHODS: We conducted a retrospective review of 81 hips in 60 patients...
March 21, 2017: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/28323850/ligand-guided-homology-modelling-of-the-gabab2-subunit-of-the-gabab-receptor
#6
Thibaud Freyd, Dawid Warszycki, Stefan Mordalski, Andrzej J Bojarski, Ingebrigt Sylte, Mari Gabrielsen
γ-aminobutyric acid (GABA) is the main inhibitory neurotransmitter in the central nervous system, and disturbances in the GABAergic system have been implicated in numerous neurological and neuropsychiatric diseases. The GABAB receptor is a heterodimeric class C G protein-coupled receptor (GPCR) consisting of GABAB1a/b and GABAB2 subunits. Two GABAB receptor ligand binding sites have been described, namely the orthosteric GABA binding site located in the extracellular GABAB1 Venus fly trap domain and the allosteric binding site found in the GABAB2 transmembrane domain...
2017: PloS One
https://www.readbyqxmd.com/read/28323845/insulin-and-bone-health-in-young-adults-the-mediator-role-of-lean-mass
#7
Ana Torres-Costoso, Diana P Pozuelo-Carrascosa, Celia Álvarez-Bueno, Asunción Ferri-Morales, Jose Miota Ibarra, Blanca Notario-Pacheco, Vicente Martínez-Vizcaíno
BACKGROUND: The positive relationship between lean mass (LM) and bone health is well known, but a positive association between insulin and LM has also been described. Insulin has some anabolic properties on bone through the stimulation of osteoblast differentiation, yet the role of LM as a confounder or mediator in this relationship remains uncertain. OBJECTIVE: To examine whether the association between insulin levels and bone health is mediated by LM. METHODS: A cross-sectional study was conducted at the Castilla La Mancha University (Spain) involving 466 young adults (113 young men; 19...
2017: PloS One
https://www.readbyqxmd.com/read/28323716/clinical-experience-using-a-remote-control-injection-system-in-vertebroplasty-feasibility-safety-and-cement-leakage-of-osteoporotic-and-malignant-compression-fractures
#8
Peng Jin, Xunwei Liu, Min Li, Gang Sun
STUDY DESIGN: A retrospective study. SUMMARY OF BACKGROUND DATA: Cement leakage is a frequent occurrence in vertebroplasty and is also the main source of complications. Continuous radiographic evaluation is mandatory to detect cement leakage during injecting cement into the vertebral body, while the operator is subjected to x-ray radiation exposure. OBJECTIVE: The aim of this study was to evaluate the feasibility and safety of vertebroplasty performed on patients and operators for the treatment of osteoporotic and malignant vertebral compression fractures using a remote control injection system...
April 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28323697/generation-and-development-of-paravertebral-ossification-in-cervical-artificial-disk-replacement-a-detailed-analytic-report-using-coronal-reconstruction-ct
#9
Wei Tian, Xiao Han, Bo Liu, Da He, Yanwei Lv, James Yue
STUDY DESIGN: A retrospective follow-up study and review of images in published papers. OBJECTIVE: To determine whether true heterotopic ossification (HO) occurs in artificial disk replacement (ADR); to evaluate the incidence of paravertebral ossification (PO) and its influence on ADR. SUMMARY OF BACKGROUND DATA: HO is typically defined as the abnormal formation of true bone within extraskeletal soft tissues. However, HO in ADR does not fit this definition precisely, as it originates from vertebral body, making it hard to distinguish radiologically from preexisting osteophytes...
April 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28323692/hyperlordosis-is-associated-with-facet-joint-pathology-at-the-lower-lumbar-spine
#10
Thorsten Jentzsch, James Geiger, Matthias A König, Clément M L Werner
STUDY DESIGN: A retrospective study. OBJECTIVE: Our study opted to clarify the remaining issues of lumbar lordosis (LL) with regard to (1) its physiological values, (2) age, (3) sex, and (4) facet joint (FJ) arthritis and orientation using computed tomography (CT) scans. SUMMARY OF BACKGROUND DATA: Recent studies have questioned whether LL really decreases with age, but study sample sizes have been rather small and mostly been based on x-rays...
April 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28323691/mri-may-serve-as-a-valid-alternative-to-standing-radiography-in-evaluating-the-sagittal-alignment-of-the-upper-thoracic-spine
#11
Fei Wang, Xu Sun, Saihu Mao, Zhen Liu, Jun Qiao, Feng Zhu, Zezhang Zhu, Tao Pan, Ling Chen, Qinghua Zhao, Yong Qiu
STUDY DESIGN: This study is of a retrospective radiographic design. OBJECTIVE: The objective of the study was to compare supine magnetic resonance images (MRI) with standing x-ray scanning in the evaluation of the sagittal alignment of the upper thoracic spine. SUMMARY OF BACKGROUND DATA: X-ray films have been reported to be inaccurate in evaluating the proximal thoracic sagittal alignment because of poor visibility of the upper thoracic region...
April 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28323657/histology-and-gadolinium-distribution-in-the-rodent-brain-after-the-administration-of-cumulative-high-doses-of-linear-and-macrocyclic-gadolinium-based-contrast-agents
#12
Jessica Lohrke, Anna-Lena Frisk, Thomas Frenzel, Laura Schöckel, Martin Rosenbruch, Gregor Jost, Diana Constanze Lenhard, Martin A Sieber, Volker Nischwitz, Astrid Küppers, Hubertus Pietsch
OBJECTIVES: Retrospective studies in patients with primary brain tumors or other central nervous system pathologies as well as postmortem studies have suggested that gadolinium (Gd) deposition occurs in the dentate nucleus (DN) and globus pallidus (GP) after multiple administrations of primarily linear Gd-based contrast agents (GBCAs). However, this deposition has not been associated with any adverse effects or histopathological alterations. The aim of this preclinical study was to systematically examine differences between linear and macrocyclic GBCAs in their potential to induce changes in brain and skin histology including Gd distribution in high spatial resolution...
March 20, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28323617/cryoem-structures-of-membrane-pore-and-prepore-complex-reveal-cytolytic-mechanism-of-pneumolysin
#13
Katharina van Pee, Alexander Neuhaus, Edoardo D'Imprima, Deryck J Mills, Werner Kühlbrandt, Özkan Yildiz
Many pathogenic bacteria produce pore-forming toxins to attack and kill human cells. We have determined the 4.5 Å structure of the ~2.2 MDa pore complex of pneumolysin, the main virulence factor of Streptococcus pneumoniae, by cryoEM. The pneumolysin pore is a 400 Å ring of 42 membrane-inserted monomers. Domain D3 of the soluble toxin refolds into two ~85 Å β-hairpins that traverse the lipid bilayer and assemble into a 168-strand β-barrel. The pore complex is stabilized by salt bridges between β-hairpins of adjacent subunits and an internal α-barrel...
March 21, 2017: ELife
https://www.readbyqxmd.com/read/28323420/synthesis-and-characterization-of-the-high-pressure-nickel-borate-%C3%AE-nib4o7
#14
Martin K Schmitt, Oliver Janka, Oliver Niehaus, Thomas Dresselhaus, Rainer Pöttgen, Florian Pielnhofer, Richard Weihrich, Maria Krzhizhanovskaya, Stanislav Filatov, Rimma Bubnova, Lkhamsuren Bayarjargal, Björn Winkler, Robert Glaum, Hubert Huppertz
γ-NiB4O7 was synthesized in a high-pressure/high-temperature experiment at 5 GPa and 900 °C. The single-crystal structure analysis yielded the following results: space group P6522 (No. 179), a = 425.6(2), c = 3490.5(2) pm, V = 0.5475(2) nm(3), Z = 6, and Flack parameter x = -0.010(5). Second harmonic generation measurements confirmed the acentric crystal structure. Furthermore, γ-NiB4O7 was characterized via vibrational as well as single-crystal electronic absorption spectroscopy, magnetic measurements, high-temperature X-ray diffraction, differential scanning calorimetry, and thermogravimetry...
March 21, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28323401/zinc-and-copper-effects-on-stability-of-tubulin-and-actin-networks-in-dendrites-and-spines-of-hippocampal-neurons
#15
Laura Perrin, Stephane Roudeau, Asuncion Carmona, Florelle Domart, Jennifer D Petersen, Sylvain Bohic, Yang Yang, Peter Cloetens, Richard Ortega
Zinc and copper ions can modulate the activity of glutamate-receptors. However, labile zinc and copper ions likely represent only the tip of the iceberg and other neuronal functions are suspected for these metals in their bound state. We performed synchrotron X-ray fluorescence imaging with 30 nm resolution to image total biometals in dendrites and spines from hippocampal neurons. We found that zinc is distributed all along the dendrites while copper is mainly pinpointed within the spines. In spines, zinc content is higher within the spine head while copper is higher within the spine neck...
March 21, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28321991/atomic-layer-deposition-of-a-silver-nanolayer-on-advanced-titanium-orthopedic-implants-inhibits-bacterial-colonization-and-supports-vascularized-de-novo-bone-ingrowth
#16
Aine Devlin-Mullin, Naomi M Todd, Zahra Golrokhi, Hua Geng, Moritz A Konerding, Nigel G Ternan, John A Hunt, Richard J Potter, Chris Sutcliffe, Eric Jones, Peter D Lee, Christopher A Mitchell
Joint replacement surgery is associated with significant morbidity and mortality following infection with either methicillin-resistant Staphylococcus aureus (MRSA) or Staphylococcus epidermidis. These organisms have strong biofilm-forming capability in deep wounds and on prosthetic surfaces, with 10(3) -10(4) microbes resulting in clinically significant infections. To inhibit biofilm formation, we developed 3D titanium structures using selective laser melting and then coated them with a silver nanolayer using atomic layer deposition...
March 21, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28320069/usefulness-of-laboratory-and-radiological-investigations-in-the-management-of-supraventricular-tachycardia
#17
Aadith Ashok, Miguel Cabalag, David McD Taylor
OBJECTIVE: Although ED patients presenting with supraventricular tachycardia (SVT) are commonly investigated, the value of these investigations has been questioned. We aimed to determine the frequency and utility of investigations in patients with SVT. METHODS: We undertook an explicit retrospective medical record audit of patients with SVT who presented to a single ED (January 2004 to June 2014). Data on demographics, presenting complaints, investigations and outcomes were extracted...
March 20, 2017: Emergency Medicine Australasia: EMA
https://www.readbyqxmd.com/read/28319943/femoral-neck-x-ray-absorptiometry-parameters-and-peripheral-quantitative-computer-tomography-tibial-cortical-density-predict-survival-in-dialysis-patients
#18
Natalie Yap, Phillip Wong, Stella McGinn, Maria-Liza Nery, Jean Doyle, Lynda Wells, Phillip Clifton-Bligh, Roderick J Clifton-Bligh
BACKGROUND: Low bone mineral density (BMD) is a known independent predictor of mortality in the general elderly population. However, studies in patients with end-stage renal disease (ESRD) are limited. The present study evaluated mortality during long-term follow-up in a population of patients having dialysis for ESRD, in whom BMD was also measured. METHODS: Fifty-eight patients with ESRD were recruited consecutively from a dialysis clinic and followed prospectively for 6 years...
March 21, 2017: Nephron
https://www.readbyqxmd.com/read/28319904/sensitivity-enhancement-of-graphene-zinc-oxide-nanocomposite-based-electrochemical-impedance-genosensor-for-single-stranded-rna-detection
#19
Sze Shin Low, Hwei-San Loh, Jian Sheng Boey, Poi Sim Khiew, Wee Siong Chiu, Michelle T T Tan
An efficient electrochemical impedance genosensing platform has been constructed based on graphene/zinc oxide nanocomposite produced via a facile and green approach. Highly pristine graphene was synthesised from graphite through liquid phase sonication and then mixed with zinc acetate hexahydrate for the synthesis of graphene/zinc oxide nanocomposite by solvothermal growth. The as-synthesised graphene/zinc oxide nanocomposite was characterised with scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy and X-ray diffractometry (XRD) to evaluate its morphology, crystallinity, composition and purity...
February 27, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28319888/heterogeneous-reaction-of-peroxyacetyl-nitrate-pan-on-soot
#20
Ximeng Zhao, Tianyu Gao, Jianbo Zhang
The interaction between photochemical oxidants and aerosol particles has been examined in previous atmospheric pollution studies. The heterogeneous reaction can affect the concentration of gases and free radicals, as well as the morphology and properties of particles. In this report, the interaction between the photochemical oxidant peroxyacetyl nitrate (PAN) and soot particles was investigated using a flow tube system. We used real-time online monitoring equipment to track changes in PAN concentrations. Substances on the soot surface were detected using ion chromatography (IC), x-ray photoelectron spectroscopy (XPS), and other surface analysis methods...
March 6, 2017: Chemosphere
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