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https://www.readbyqxmd.com/read/28340395/a-quint-wavelength-uv-spectroscopy-for-simultaneous-determination-of-dichlorobenzene-chlorobenzene-and-benzene-in-simulated-water-reduced-by-nanoscale-zero-valent-fe-ni-bimetal
#1
Xiaofang Wan, Yu Liu, Xin-Sheng Chai, Youming Li, Congbao Guo
A quint-wavelength UV spectroscopy for rapid determination of dichlorobenzene (DCB), chlorobenzene (CB) and benzene (B) was developed for the dechlorination process of DCB reduced by nanoscale zero-valent Fe/Ni bimetal. Based on the absorbance measurements at 260, 269, 277, 290 and 300nm, the equations for calculating the concentration of DCB and CB and B were established, in which the spectral interference from the nanoparticles could be effectively minimized. The results show that the present method has a good measurement precision (the relative standard deviations are within 2...
March 18, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28340146/effect-of-broiler-breeders-fed-with-corn-or-sorghum-diet-and-canthaxanthin-supplementation-on-production-and-reproductive-performance
#2
C E V Bonilla, A P Rosa, A Londero, C B S Giacomini, C Orso, M O Fernandes, S J Paixão, D V Bonamigo
This study was designed to evaluate the effect of corn or sorghum diet and canthaxanthin (CX) supplementation on performance in broiler breeders. A total of 440 females with similar body weight (BW) (3.71 ± 0.14 kg) and 60 roosters were placed in an open-sided house with 20 pens, randomly distributed in a factorial arrangement (2 × 2). There were 4 diets of 2 ingredients; corn (CO) or sorghum (SO) and 2 levels of CX; 6 mg/kg (CX) and 0 mg/kg (NCX) totaling 5 replicate pens of 22 females and 3 males each, from 42 to 65 wk, divided in 2 periods (from wk 42 to 53 and wk 54 to 65)...
March 4, 2017: Poultry Science
https://www.readbyqxmd.com/read/28339846/estimation-of-whole-body-radiation-exposure-from-brachytherapy-for-oral-cancer-using-a-monte-carlo-simulation
#3
Y Ozaki, H Watanabe, A Kaida, M Miura, K Nakagawa, K Toda, R Yoshimura, Y Sumi, T Kurabayashi
Early stage oral cancer can be cured with oral brachytherapy, but whole-body radiation exposure status has not been previously studied. Recently, the International Commission on Radiological Protection Committee (ICRP) recommended the use of ICRP phantoms to estimate radiation exposure from external and internal radiation sources. In this study, we used a Monte Carlo simulation with ICRP phantoms to estimate whole-body exposure from oral brachytherapy. We used a Particle and Heavy Ion Transport code System (PHITS) to model oral brachytherapy with 192Ir hairpins and 198Au grains and to perform a Monte Carlo simulation on the ICRP adult reference computational phantoms...
February 24, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28339539/unique-aggregation-of-conjugated-amphotericin-b-and-its-interaction-with-lipid-membranes
#4
Sarah Kagan, Diana E Ickowicz, Abraham J Domb, Arie Dagan, Itzhack Polacheck
The purpose of this paper was to investigate the aggregation of amphotericin B (AMB) and AMB-arabinogalactan conjugate (AMB-AGC), and the interactions of these drugs with free and membrane-embedded sterols. Aggregation of AMB and AMB-AGC was studied by circular dichroic (CD) and UV absorbance spectroscopic techniques. The effect of liposomes on the spectra was utilized to investigate the interactions of aggregates with membrane-embedded sterols. Interaction with free sterols was studied by measuring sterols' effect on AMB/AMB-AGC susceptibility test...
October 7, 2016: Medical Mycology: Official Publication of the International Society for Human and Animal Mycology
https://www.readbyqxmd.com/read/28339275/ultrafast-photoinduced-electric-polarization-switching-in-a-hydrogen-bonded-ferroelectric-crystal
#5
K Iwano, Y Shimoi, T Miyamoto, D Hata, M Sotome, N Kida, S Horiuchi, H Okamoto
Croconic acid crystals show proton displacive-type ferroelectricity with a large spontaneous polarization reaching 20  μC/cm^{2}, which originates from the strong coupling of proton and π-electron degrees of freedom. Such a coupling makes us expect a large polarization change by photoirradiations. Optical-pump second-harmonic-generation-probe experiments reveal that a photoexcited croconic-acid crystal loses the ferroelectricity substantially with a maximum quantum efficiency of more than 30 molecules per one absorbed photon...
March 10, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28339120/accessing-structurally-diverse-near-infrared-cyanine-dyes-for-folate-receptor-targeted-cancer-cell-staining
#6
Sandra G König, Roland Krämer
Folate receptor (FR) targeting is one of the most promising strategies for the development of small-molecule based cancer imaging agents since the FR is highly overexpressed on the surface of many cancer cell types. FR-targeted conjugates of NIR emissive cyanine dyes are in advanced clinical trials for fluorescence-guided surgery and are valuable research tools for optical molecular imaging in animal models. Only a small number of promising conjugates has been evaluated so far. Analysis of structure-performance relations to identify critical factors modulating the performance of targeted conjugates is essential for successful further optimization...
March 24, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28338947/microenvironment-in-the-canopy-rivals-the-host-tree-water-status-in-controlling-sap-flow-of-a-mistletoe-species
#7
Da Yang, Guillermo Goldstein, Miao Wang, Wei-Wei Zhang, Ai-Ying Wang, Yan-Yan Liu, Guang-You Hao
Mistletoes absorb water from the vascular system of their hosts and thus the water use of mistletoes can be influenced by the water status of their hosts besides abiotic environmental conditions; however, there is a lack of studies on the dynamics of mistletoe water utilization in relation to both types of controlling factors. By building a canopy platform at 20 m above the ground, we monitored the dynamic changes of sap flow of Viscum coloratum (Kom.) Nakai (Loranthaceae) in combination with continuous measurements of microclimatic variables and volumetric water content (VWC) of its host tree branch xylem...
March 3, 2017: Tree Physiology
https://www.readbyqxmd.com/read/28338901/characterization-of-the-genuine-type-2-chromatic-acclimation-in-the-two-geminocystis-cyanobacteria
#8
Yuu Hirose, Naomi Misawa, Chinatsu Yonekawa, Nobuyoshi Nagao, Mai Watanabe, Masahiko Ikeuchi, Toshihiko Eki
Certain cyanobacteria can adjust the wavelengths of light they absorb by remodeling their photosynthetic antenna complex phycobilisome via a process called chromatic acclimation (CA). Although several types of CA have been reported, the diversity of the molecular mechanisms of CA among the cyanobacteria phylum is not fully understood. Here, we characterized the molecular process of CA of Geminocystis sp. strains National Institute of Environmental Studies (NIES)-3708 and NIES-3709. Absorption and fluorescence spectroscopy revealed that both strains dramatically alter their phycoerythrin content in response to green and red light...
March 8, 2017: DNA Research: An International Journal for Rapid Publication of Reports on Genes and Genomes
https://www.readbyqxmd.com/read/28338869/measurement-of-absorption-dose-outside-irradiation-field-in-imrt
#9
Makoto Hirata, Hajime Monzen, Kohei Hanaoka, Yasumasa Nishimura
The absorption dose outside the irradiation field for prostate intensity-modulated radiation therapy was measured and evaluated by comparison with calculated values of radiation treatment planning system (TPS). The values of TPS calculated were using Varian CLINAC21EX/Eclipse and TomoTherapy Planning System for constant irradiation time. The absorption dose was measured by placing a glass-element dosemeter in a human-bone enclosure phantom with a planning target volume inside the irradiation field. The organs at risk were the rectum, spinal cord, thyroid, eyeball and the left lung...
March 3, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/28338853/radiological-impacts-assessment-for-workers-in-ceramic-industry-in-serbia
#10
Nataša Todorovic, Dušan Mrda, Jan Hansman, Slavko Todorovic, Jovana Nikolov, Miodrag Krmar
Studies have been carried out to determine the natural radioactivity in some materials used in ceramic industry (zircon, zirkosil, Zircobit MO/S, zircon silicate, zirklonil frit, hematite, bentonite, wollastonite, raw kaolin, kaolinized granite, sileks ball, feldspar, pigment, white base serigraphic, engobe) and their associated radiation hazard. The external hazard index, Hex, values, radium equivalent activity, Raeq, total absorbed dose rates, D and annual effective dose, De were derived for all measured materials and compared with the recommended values to assess the external radiation hazards to workers who worked in ceramic industries in Serbia...
March 3, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/28338814/korean-pediatric-and-adult-head-computational-phantoms-and-application-to-photon-specific-absorbed-fractions-calculations
#11
Daphnée Villoing, Dayton McMillan, Kwang Pyo Kim, Il Park, Ae-Kyoung Lee, Hyung-do Choi, Choonsik Lee
In recent decades, applications of single photon emission computed tomography and positron emission tomography in clinical neuroimaging have markedly increased. In this study, we developed a series of Korean computational head phantoms with detailed cranial substructures for 6-, 9-, 12- and 15-year-old children and adult by non-uniformly adjusting a template head phantom to match the Korean standard head dimensions. The Korean head phantoms were coupled with a Monte Carlo transport code to calculate age-dependent specific absorbed fraction (SAF) for the combination of 10 source and target regions and mono-energetic photons ranging from 0...
February 23, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/28338696/polymer-confined-growth-of-perforated-mose2-single-crystals-on-n-doped-graphene-toward-enhanced-hydrogen-evolution
#12
Minghao Zhuang, Yao Ding, Xuewu Ou, Zhengtang Luo
The edge and corner atoms of 2D transition metal dichalcogenides (TMDCs) are the main electrocatalytically active sites for electrochemical reaction. Here, we demonstrate an approach to generate abundant edge/corner atoms in molybdenum diselenide (MoSe2) nanocrystals supported by nitrogen-doped graphene (NG) which consequently leads to significantly enhanced hydrogen evolution reaction (HER) activity. These structures were fabricated by firstly absorbing the Mo-containing precursor within polymer-functionalized graphene oxide, then selenized to obtain MoSe2 nanocrystals on the surface, and finally H2 etching was performed to form perforated structures...
March 24, 2017: Nanoscale
https://www.readbyqxmd.com/read/28338603/antioxidant-properties-of-selenophene-thiophene-and-their-aminocarbonitrile-derivatives
#13
Levon A Tavadyan, Zaruhi H Manukyan, Lusik H Harutyunyan, Makich V Musayelyan, Adrine D Sahakyan, Hakob G Tonikyan
The oxygen radical absorbance capacity (ORAC) method was used to detect the antiperoxyradical ability of organoselenium compounds: selenophene and its derivative, 2-amino-4,5,6,7-tetrahydro-1-selenophene-3-carbonitrile (ATSe); while as a comparison, the sulfur-containing analogue of selenophene-thiophene and its derivative-2-amino-4,5,6,7-tetrahydro-1-thiophene-3-carbonitrile (ATS)-was selected. Cyclic voltammetry (CV), differential pulse voltammetry (DPV) and squarewave voltammetry (SWV) methods were used to determine the redox characteristics of organoselenium and organosulfur compounds...
March 24, 2017: Antioxidants (Basel, Switzerland)
https://www.readbyqxmd.com/read/28338529/dosimetry-software-hermes-internal-radiation-dosimetry-from-quantitative-image-reconstruction-to-voxel-level-absorbed-dose-distribution
#14
Eero T Hippeläinen, Mikko J Tenhunen, Hanna O Mäenpää, Jorma J Heikkonen, Antti O Sohlberg
OBJECTIVE: The aim of this work is to validate a software package called Hermes Internal Radiation Dosimetry (HIRD) for internal dose assessment tailored for clinical practice. The software includes all the necessary steps to perform voxel-level absorbed dose calculations including quantitative reconstruction, image coregistration and volume of interest tools. METHODS: The basics of voxel-level dosimetry methods and implementations to HIRD software are reviewed...
March 23, 2017: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/28338143/mastering-the-non-equilibrium-assembly-and-operation-of-molecular-machines
#15
Cristian Pezzato, Chuyang Cheng, J Fraser Stoddart, R Dean Astumian
In mechanically interlocked compounds, such as rotaxanes and catenanes, the molecules are held together by mechanical rather than chemical bonds. These compounds can be engineered to have several well-defined mechanical states by incorporating recognition sites between the different components. The rates of the transitions between the recognition sites can be controlled by introducing steric "speed bumps" or electrostatically switchable gates. A mechanism for the absorption of energy can also be included by adding photoactive, catalytically active, or redox-active recognition sites, or even charges and dipoles...
March 24, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28337971/semiconductor-meta-surface-based-perfect-light-absorber
#16
Guiqiang Liu, Yiyou Nie, Guolan Fu, Xiaoshan Liu, Yi Liu, Li Tang, Zhengqi Liu
We numerically proposed and demonstrated a semiconductor meta-surface light absorber, which consists of a silicon patches array on a silicon thin-film and an opaque silver substrate. The Mie resonances of the silicon patches and the fundamental cavity mode of the ultra-thin silicon film couple strongly to the incident optical field, leading to a multi-band perfect absorption. The maximal absorption is above 99.5% and the absorption is polarization-independent. Moreover, the absorption behavior is scalable in the frequency region via tuning the structural parameters...
March 24, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28337723/assessment-of-safety-efficacy-and-dosimetry-of-a-novel-18-kda-translocator-protein-ligand-11-c-cb184-in-healthy-human-volunteers
#17
Muneyuki Sakata, Kenji Ishibashi, Masamichi Imai, Kei Wagatsuma, Kenji Ishii, Kentaro Hatano, Kiichi Ishiwata, Jun Toyohara
BACKGROUND: N,N-di-n-propyl-2-[2-(4-[(11)C]methoxyphenyl)-6,8-dichloroimidazol[1,2-a]pyridine-3-yl]acetamide ([(11)C]CB184) is a novel selective radioligand for the 18-kD translocator protein (TSPO), which is upregulated in activated microglia in the brain, and may be useful in positron emission tomography (PET). We examined the safety, radiation dosimetry, and initial brain imaging with [(11)C]CB184 in healthy human volunteers. RESULTS: Dynamic [(11)C]CB184 PET scans (90 min) were performed in five healthy male subjects...
December 2017: EJNMMI Research
https://www.readbyqxmd.com/read/28337672/fentanyl-formulations-in-the-management-of-pain-an-update
#18
REVIEW
Stephan A Schug, Sonya Ting
Fentanyl is a synthetic, highly selective opioid with many desirable physicochemical properties, including a high lipophilicity and predictable pharmacokinetics. These properties have an established record in the management of pain in a variety of settings, particularly acute pain and breakthrough cancer pain. Fentanyl was initially developed for parenteral use; however, this is invasive and impractical in the outpatient setting. Unfortunately, the high first-pass metabolism of fentanyl makes oral formulations unfeasible...
March 23, 2017: Drugs
https://www.readbyqxmd.com/read/28337561/optimization-of-ultraviolet-ozone-treatment-process-for-improvement-of-polycaprolactone-pcl-microcarrier-performance
#19
Nurhusna Samsudin, Yumi Zuhanis Has-Yun Hashim, Mohd Azmir Arifin, Maizirwan Mel, Hamzah Mohd Salleh, Iis Sopyan, Dzun Noraini Jimat
Growing cells on microcarriers may have overcome the limitation of conventional cell culture system. However, the surface functionality of certain polymeric microcarriers for effective cell attachment and growth remains a challenge. Polycaprolactone (PCL), a biodegradable polymer has received considerable attention due to its good mechanical properties and degradation rate. The drawback is the non-polar hydrocarbon moiety which makes it not readily suitable for cell attachment. This report concerns the modification of PCL microcarrier surface (introduction of functional oxygen groups) using ultraviolet irradiation and ozone (UV/O3) system and investigation of the effects of ozone concentration, the amount of PCL and exposure time; where the optimum conditions were found to be at 60,110...
March 23, 2017: Cytotechnology
https://www.readbyqxmd.com/read/28337503/gut-microbiome-related-metabolic-changes-in-plasma-of-antibiotic-treated-rats
#20
C Behr, H Kamp, E Fabian, G Krennrich, W Mellert, E Peter, V Strauss, T Walk, I M C M Rietjens, B van Ravenzwaay
The intestinal microbiota contributes to the metabolism of its host. Adequate identification of the microbiota's impact on the host plasma metabolites is lacking. As antibiotics have a profound effect on the microbial composition and hence on the mammalian-microbiota co-metabolism, we studied the effects of antibiotics on the "functionality of the microbiome"-defined as the production of metabolites absorbed by the host. This metabolomics study presents insights into the mammalian-microbiome co-metabolism of endogenous metabolites...
March 23, 2017: Archives of Toxicology
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