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https://www.readbyqxmd.com/read/29792806/fate-of-fluorescence-labels-their-adsorption-and-desorption-kinetics-to-silver-nanoparticles
#1
Claudia Kästner, Linda Böhmert, Albert Braeuning, Alfonso Lampen, Andreas F Thünemann
Silver nanoparticles are among the most widely used und produced nanoparticles. Due to their frequent application in consumer products, the assessment of their toxicological potential has seen a renewed importance. A major difficulty is the traceability of nanoparticles in in vitro and in vivo experiments. Even if the particles are labeled, for example by a fluorescent marker, the dynamic exchange of ligands often prohibits their spatial localization. Our study provides an insight into the adsorption and desorption kinetics of two different fluorescent labels on silver nanoparticles with a core radius of 3 nm by dynamic light scattering (DLS), small-angle X-ray scattering (SAXS) and fluorescence spectroscopy...
May 24, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29792699/water-soluble-ruthenium-ii-carbonyls-with-1-3-5-triaza-7-phosphoadamantane
#2
Federica Battistin, Gabriele Balducci, Barbara Milani, Enzo Alessio
As a continuation of our strategy for preparing new Ru(II) precursors with improved water solubility through the introduction of highly water-soluble 1,3,5-triaza-7-phosphoadamantane (PTA) supporting ligands in the coordination sphere, in this work, we address the largely unexplored preparation of Ru(II)-PTA carbonyls. Two complementary synthetic approaches were used: (1) the treatment of a series of neutral Ru(II)-CO-dmso compounds of general formula RuCl2 (CO) n (dmso)4- n ( n = 1-3, 1-5) with PTA; (2) the reaction of Ru(II)-PTA complexes with CO...
May 24, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29791412/shock-wave-imaging-by-density-recovery-from-intensity-measurements
#3
Biswajit Medhi, Gopalakrishna M Hegde, Kalidevapura Jagannath Reddy, Debasish Roy, Ram Mohan Vasu
A method for quantitative estimation of density variation in high-speed flow, which uses light as an interrogating tool, is described. The wavefront distortion of the interrogating beam induced by the compressible flow field is estimated quantitatively, in which the density gradient of the flow field is seen as refractive-index gradient by the probing beam. The distorted wavefront is measured quantitatively by using the cross-sectional intensities of the distorted wavefront along the optical axis. Iterative algorithms are developed using both deterministic (Gauss-Newton) and stochastic (ensemble Kalman filter) update strategies to recover unknown parameters such as the phase of the wavefront or the refractive index distribution in the flow directly from the measured intensities...
May 20, 2018: Applied Optics
https://www.readbyqxmd.com/read/29790859/neutron-track-length-estimator-for-gate-monte-carlo-dose-calculation-in-radiotherapy
#4
Halima Elazhar, Thomas Deschler, Jean Michel Letang, Abdelmjid Nourreddine, Nicolas Arbor
The out-of-field dose in radiation therapy is a growing concern in regards to the late side-effects and secondary cancer induction. In high-energy X-ray therapy, the secondary neutrons generated through photonuclear reactions in the accelerator are part of this secondary dose. The neutron dose is currently not estimated by the treatment planning system (TPS) while it appears to be preponderant for distances greater than 50~cm from the isocenter. Monte Carlo (MC) simulation has become the gold standard for accurately calculating the neutron dose under specific treatment conditions but the method is also known for having a slow statistical convergence, which makes it difficult to be used on a clinical basis...
May 23, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29790567/regional-diversity-in-the-murine-cortical-vascular-network-is-revealed-by-synchrotron-x-ray-tomography-and-is-amplified-with-age
#5
J A Núñez, A Goring, B Javaheri, H Razi, D Gomez-Nicola, A A Pitsillides, P J Thurner, D Gomez-Nicola, P Schneider, C E Clarkin
TCortical bone is permeated by a system of pores, occupied by the blood supply and osteocytes. With ageing, bone mass reduction and disruption of the microstructure are associated with reduced vascular supply. Insight into the regulation of the blood supply to the bone could enhance the understanding of bone strength determinants and fracture healing. Using synchrotron radiation-based computed tomography, the distribution of vascular canals and osteocyte lacunae was assessed in murine cortical bone and the influence of age on these parameters was investigated...
May 23, 2018: European Cells & Materials
https://www.readbyqxmd.com/read/29790543/a-bi-metallic-mof-catalyst-via-sensitive-detection-adsorption-of-fe-3-ions-for-size-selective-reaction-prompting
#6
Yang Li, Ziling Chang, Fangmin Huang, Pengyan Wu, Huacong Chu, Jian Wang
A cadmium(ii)-based MOF, Cd-MDIP, was successfully prepared by hydrothermal reaction between the tetra-carboxylic ligand 5,5'-methylenebisophthalic acid (H4MDIP) and cadmium perchlorate. The X-ray crystal structure analysis showed that there are two uncoordinated carboxyl groups in each ligand and a 1D elliptical channel along the [001] direction. Because of the existence of uncoordinated carboxyl groups within open frameworks, Cd-MDIP exhibited a high sensitivity (Stern-Volmer constant KSV = 4.13 × 104 L mol-1) and a low detection limit (80 nM) for Fe3+ ions in pure water, which is much lower than the national standard for Fe3+ in daily drinking water (5...
May 23, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29790539/uranium-iii-complexes-supported-by-hydrobis-mercaptoimidazolyl-borates-synthesis-and-oxidation-chemistry
#7
Leonor Maria, Isabel C Santos, Isabel Santos
The reaction of [UI3(thf)4] with the sodium or lithium salts of hydrobis(2-mercapto-1-methylimidazolyl)borate ligands ([H(R)B(timMe)2]-) in a 1 : 2 ratio, in tetrahydrofuran, gave the U(iii) complexes [UI{κ3-H,S,S'-H(R)B(timMe)2}2(thf)2] (R = H (1), Ph (2)) in good yields. Crystals of [UI{κ3-H,S,S'-H(Ph)B(timMe)2}2(thf)2] (2) were obtained by recrystallization from a tetrahydrofuran/acetonitrile solution, and the ion-separated uranium complex [U{κ3-H,S,S'-H(Ph)B(timMe)2}2(CH3CN)3][I] (3-I) was obtained by dissolution of 2 in acetonitrile followed by recrystallization...
May 23, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29790314/superselective-intraarterial-cerebral-infusion-of-cetuximab-with-blood-brain-barrier-disruption-combined-with-stupp-protocol-for-newly-diagnosed-glioblastoma
#8
Kay O Kulason, Julia R Schneider, Shamik Chakraborty, Christopher G Filippi, Bidyut Pramanik, Tamika Wong, Sherese Fralin, Karissa Tan, Ashley Ray, Rachel A Alter, Rafael Ortiz, Alexis Demopoulos, David J Langer, John A Boockvar
We describe the first case of a novel treatment for a newly diagnosed glioblastoma (GBM) using superselective intraarterial cerebral infusion (SIACI) of cetuximab after osmotic disruption of the blood-brain barrier (BBB) with mannitol. A 51year-old female underwent craniotomy for removal of a right frontal GBM. Pathology confirmed EGFR amplification, and she underwent three treatments of SIACI of cetuximab to the tumor site. The first treatment was given within a week of starting standard of care chemoradiation (Stupp protocol), which is a combination of radiation treatment (2 Gy per/ day x 30 days, total of 60 Gy) and oral temozolomide (75 mg/m2 )...
May 2018: Journal of Experimental Therapeutics & Oncology
https://www.readbyqxmd.com/read/29789768/radiological-and-clinical-findings-following-rectal-contact-x-ray-brachytherapy-papillon-technique-how-to-assess-response
#9
Matt J D Dunstan, Tim A Rockall, Kate Potter, Alexandra J Stewart
Purpose: Rectal contact X-ray brachytherapy (Papillon radiotherapy) has recently received approval from the National Institute for Health and Care Excellence. In particular, it is suitable for elderly patients who are high-risk for a major operation, but it may also be undertaken for patients who wish to avoid a stoma. It is imperative to be able to identify clinical response or tumor regrowth on surveillance magnetic resonance imaging (MRI) and sigmoidoscopy. This article aims to help clinicians to interpret MRIs and endoscopic appearances following Papillon radiotherapy...
April 2018: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/29789476/female-facial-attractiveness-assessed-from-three-dimensional-contour-lines-by-university-students
#10
Jinwara Jirathamopas, Yu Fang Liao, Ellen Wen-Ching Ko, Yu-Ray Chen, Chiung Shing Huang
BACKGROUND: Three-dimensional (3D) images could provide more accurate evaluation for facial attractiveness than two-dimensional (2D) images. The 3D facial image could be simplified into gray scale 3D contour lines. Whether female facial attractiveness could be perceived in these simplified 3D facial contour lines should be determined. METHODS: A series of 100 2D photographs (one frontal and two lateral views) and 3D contour lines extracted from 3D facial images of females were projected onto a screen...
May 22, 2018: Dentistry journal
https://www.readbyqxmd.com/read/29789040/adsorption-and-oxidation-of-as-iii-on-iron-hydro-oxides
#11
Zhixi Zhao, Ming Guan, Han Zeng, Ping Chen
  Iron (hydro)oxides, including poorly crystalline ferrihydrite and the more crystalline forms, hematite and magnetite, play an important role in the biogeochemical cycling of arsenic in aquatic environments. In this study, adsorption and oxidation experiments for As(III) were performed on ferrihydrite, hematite, and magnetite, respectively. The results showed that the three iron (hydro)oxides acted as a catalyst for the oxidation of As(III) in the presence of oxygen. The variation in the oxidation states of As(III) on iron (hydro)oxides were confirmed by X-ray Absorption Near-Edge Structure (XANES) spectra...
June 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29788999/the-first-case-of-multiple-pulmonary-granulomas-with-amyloid-deposition-in-a-dental-technician-a-rare-manifestation-as-an-occupational-lung-disease
#12
Taizou Hirano, Tadahisa Numakura, Hiroshi Moriyama, Ryoko Saito, Yutaka Shishikura, Jun Shiihara, Hisatoshi Sugiura, Masakazu Ichinose
BACKGROUND: Occupational lung diseases, such as pneumoconiosis, are one of the health problems of dental workers that have been receiving increasing interest. Pulmonary amyloidosis is a heterogenous group of diseases, and can be classified into primary (idiopathic) and secondary (associated with various inflammatory diseases, hereditary, or neoplastic). To date, the development of pulmonary amyloidosis in dental workers has not been reported. CASE PRESENTATION: A 58-year-old Japanese female presented with chest discomfort and low-grade fever that has persisted for 2 months...
May 22, 2018: BMC Pulmonary Medicine
https://www.readbyqxmd.com/read/29788936/association-between-stress-fracture-incidence-and-predicted-body-fat-in-united-states-army-basic-combat-training-recruits
#13
Joseph J Knapik, Marilyn A Sharp, Scott J Montain
BACKGROUND: A stress fracture (SF) is a highly debilitating injury commonly experienced in United States Army Basic Combat Training (BCT). Body fat (BF) may be associated with this injury but previous investigations (in athletes) have largely used SF self-reports and lacked sufficient statistical power. This investigation developed an equation to estimate %BF and used that equation to examine the relationship between %BF and SF risk in BCT recruits. METHODS: Data for the %BF predictive equation involved 349 recruits with BF obtained from dual-energy X-ray absorptiometry...
May 22, 2018: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29787948/preparation-and-application-of-a-molecular-capture-for-safety-detection-of-cosmetics-based-on-surface-imprinting-and-multi-walled-carbon-nanotubes
#14
Fang Wang, Xiaoyan Li, Junjie Li, Chen Zhu, Min Liu, Zongyuan Wu, Li Liu, Xuecai Tan, Fuhou Lei
A novel composite material for prednisone molecular capture (PS-MC) was prepared by surface imprinting technique in combination with a polyethylene filter plate coated with multi-walled carbon nanotubes for the first time. PS-MC was achieved by using prednisone as the template molecule, 3-aminopropyltriethoxysilane as the monomer, and tetraethoxysilane as the cross-linker. The structure, morphology, and thermal stability of the prepared PS-MC were studied by fourier-transform infrared spectrometry, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and thermogravimetric analysis...
May 14, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29787928/principle-of-k-na-selectivity-in-the-active-site-of-group-ii-intron-at-various-stages-of-self-splicing-pathway
#15
Abhishek Kumar, Priyadarshi Satpati
Group II introns are ribozymes which can catalyze its own splicing and relegate itself. They share common structural features and are evolutionarily related to eukaryotic spliceosome. Hence, group II introns are an excellent model system for understanding the mechanism of RNA-splicing in gene expression. Recent advancement of structural studies has provided x-ray structures of group II intron at different stages (Pre-hydrolytic, post-hydrolytic and free intron) of splicing pathway and revealed heteronuclear metal ion cluster (two potassium; K1 and K2, two magnesium; M1 and M2) in the active site as common structural feature of group II introns...
May 14, 2018: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/29787908/impact-of-fouling-on-the-decline-of-aeration-efficiency-under-different-operational-conditions-at-wrrfs
#16
Manel Garrido-Baserba, Pitiporn Asvapathanagul, Hee-Deung Park, Taek-Seung Kim, G Andres Baquero-Rodriguez, Betty H Olson, Diego Rosso
Biofilm formation influences the most energy-demanding process in the waste water treatment cycle. Biofilm growth on the surface of wastewater aeration diffusers in water resource recovery facilities (WRRFs) can increase the energy requirements up to 50% in less than 2 years. The impact of biofilms in aeration diffusers was quantified and assessed for first time using molecular tools (i.e., Energy-dispersive X-ray, Ra and RMS and Pyrosequencing) and state-of-the-art techniques (i.e., EPS quantification, Hydrophobicity and DNA quantification)...
May 19, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29787436/immunological-markers-of-chronic-occupational-radiation-exposure
#17
Valentina L Rybkina, Maria V Bannikova, Galina V Adamova, Harald Dörr, Harry Scherthan, Tamara V Azizova
This study aimed to identify immunological biomarkers for prolonged occupational radiation exposure and thus studied a random sample of the Mayak Production Association worker cohort (91 individuals). The control group included 43 local individuals never employed at the Mayak Production Association. To identify biomarkers, two groups of workers were formed: the first one included workers chronically exposed to external gamma rays at cumulative doses of 0.5-3.0 Gy (14 individuals); the second one included workers exposed to combined radiation-external gamma rays at doses ranging from 0...
July 2018: Health Physics
https://www.readbyqxmd.com/read/29787429/first-insights-into-the-m2-inflammatory-response-after-adipose-tissue-derived-stem-cell-injections-in-radiation-injured-muscles
#18
Diane Riccobono, Krisztina Nikovics, Sabine François, Anne-Laure Favier, Nicolas Jullien, Gerrit Schrock, Harry Scherthan, Michel Drouet
The cutaneous radiation syndrome is the clinical consequence of local high-dose irradiation. It is characterized by extensive inflammation, necrosis, and poor revascularization of the skin, resulting in muscle inflammation and fibrosis. Based on these physiopathological processes, subcutaneous injections of adipose-tissue-derived stem/stromal cells have shown favorable effects on skin-wound healing in a minipig model of cutaneous radiation syndrome, in which muscle fibrosis persisted. Since fibrosis is mainly due to the inflammatory processes that often affect underlying tissues as well, the beneficial effects of intramuscular injections of adipose-tissue-derived stem/stromal cells on tissue recovery were evaluated...
July 2018: Health Physics
https://www.readbyqxmd.com/read/29787271/enhanced-reactivity-of-lithium-and-copper-at-high-pressure
#19
Jack Binns, Philip Dalladay-Simpson, Mengnan Wang, Eugene Gregoryanz, Ross T Howie
High pressure can profoundly affect electronic structure and reactivity, creating compounds between elements that do not react at ambient conditions. Lithium is known to react with gold and silver, however no copper compounds are known to date. By compressing mixtures of the elements in diamond-anvil cells, compounds of lithium and copper have been synthesized and characterized by X-ray diffraction for the first time. Pressures as low as 1 GPa lead to the formation of a complex layered phase LiCu, displaying two-dimensional kagomé lattice layers of Cu atoms...
May 22, 2018: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29786655/bioactive-pyridone-alkaloids-from-a-deep-sea-derived-fungus-arthrinium-sp-ujnmf0008
#20
Jie Bao, Huijuan Zhai, Kongkai Zhu, Jin-Hai Yu, Yuying Zhang, Yinyin Wang, Cheng-Shi Jiang, Xiaoyong Zhang, Yun Zhang, Hua Zhang
Eight new 4-hydroxy-2-pyridone alkaloids arthpyrones D⁻K ( 1 ⁻ 8 ), along with two known analogues apiosporamide ( 9 ) and arthpyrone B ( 10 ), were isolated from a deep-sea-derived fungus Arthrinium sp. UJNMF0008. The structures of the isolated compounds were elucidated on the basis of spectroscopic methods with that of 1 being established by chemical transformation and X-ray diffraction analysis. Compounds 1 and 2 bore an ester functionality linking the pyridone and decalin moieties first reported in this class of metabolites, while 3 and 4 incorporated a rare natural hexa- or tetrahydrobenzofuro[3,2- c ]pyridin-3(2 H )-one motif...
May 22, 2018: Marine Drugs
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