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https://www.readbyqxmd.com/read/28433833/in-vitro-antitumor-activity-metal-uptake-and-reactivity-with-ascorbic-acid-and-bsa-of-some-gold-iii-complexes-with-n-n-ethylenediamine-bidentate-ester-ligands
#1
Nebojša Pantelić, Bojana B Zmejkovski, Branka Kolundžija, Marija Đorđić Crnogorac, Jelena M Vujić, Biljana Dojčinović, Srećko R Trifunović, Tatjana P Stanojković, Tibor J Sabo, Goran N Kaluđerović
Four novel gold(III) complexes of general formulae [AuCl2{(S,S)-R2eddl}]PF6 (R2eddl=O,O'-dialkyl-(S,S)-ethylenediamine-N,N'-di-2-(4-methyl)pentanoate, R=n-Pr, n-Bu, n-Pe, i-Bu; 1-4, respectively), were synthesized and characterized by elemental analysis, UV/Vis, IR, and NMR spectroscopy, as well as high resolution mass spectrometry. Density functional theory calculations pointed out that (R,R)-N,N'-configuration diastereoisomers were energetically the most favorable. Duo to high cytotoxic activity complex 3 was chosen for stability study in DMSO, no decomposition occurs within 24h, and for the reaction with ascorbic acid in which was reduced immediately...
April 4, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28431516/evaluation-of-the-impact-of-disease-prevention-measures-a-methodological-note-on-defining-incidence-rates
#2
Yin-Bun Cheung, Ying Xu, Matthew Cairns, Paul Milligan
BACKGROUND: In studies of recurrent events, it is common to consider a person who has suffered a disease episode and received curative treatment to be not at risk of suffering a new episode for a duration of time. It is a common practice to deduct this duration from the person's observation time in the statistical analysis of the incidence data. METHODS: We examined the concepts of incidence and protective efficacy from a real life point of view. We developed simple formulae to show the relationship between the incidence rate and protective efficacy between analyses with and without deducting the curative treatment time from the observation time...
April 21, 2017: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/28431194/closed-form-equation-to-estimate-the-dielectric-properties-of-biological-tissues-as-a-function-of-age
#3
Beadaa Mohammed, Konstanty Bialkowski, Amin Abbosh, Paul C Mills, Andrew P Bradley
Developing microwave systems for biomedical applications requires accurate dielectric properties of biological tissues for reliable modeling before prototyping and subject testing. Dielectric properties of tissues decrease with age due to the change in their water content, but there are no detailed age-dependent data, especially for young tissue-like newborns, in the literature. In this article, an age-dependent formula to predict the dielectric properties of biological tissues was derived. In the proposed method, the variation of water concentration in each type of tissue as a function of age was used to calculate its relative permittivity and conductivity...
April 21, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28430435/cu-in-halide-perovskite-cihp-solar-absorbers
#4
Xin-Gang Zhao, Dongwen Yang, Yuanhui Sun, Tianshu Li, Lijun Zhang, Liping Yu, Alex Zunger
The long-term chemical instability and the presence of toxic Pb in otherwise stellar solar absorber APbX3 made of organic molecules on the A site and halogens for X have hindered their large-scale commercialization. Previously explored ways to achieve Pb-free halide perovskites involved replacing Pb(2+) with other similar M(2+) cations in ns(2) electron configuration, e.g., Sn(2+) or by Bi(3+) (plus Ag(+)), but unfortunately this showed either poor stability (M = Sn) or weakly absorbing oversized indirect gaps (M = Bi), prompting concerns that perhaps stability and good optoelectronic properties might be contraindicated...
April 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28430254/lensless-wide-field-single-shot-imaging-through-turbid-media-based-on-object-modulated-speckles
#5
Pengfei Wu, Zi Liang, Xing Zhao, Lei Su, Lipei Song
The need to image objects through light-scattering materials is common in a range of applications. Different methods have been investigated to acquire the image of the object when diffusers are presented. In this paper, we demonstrate the object reconstruction with single-shot imaging based on the correlography principle and phase retrieval algorithm with coherent illumination. We prove the possibility of reconstructing positive and negative objects in both transmission and reflection modes with collimated and scattered light...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28430246/method-of-calculation-of-internal-parameters-of-liquid-lens
#6
Antonín Mikš, Jiří Novák
This paper is focused on the problem of determination of internal parameters of a fluidic lens composed of two immiscible liquids of different refractive index, which form a tunable refractive interface for changing the focal length of a lens. Formulas are derived for calculation of a radius of curvature of the internal interface between two liquids and refractive indices of liquids using the measurements of the focal length of the lens, positions of focal points, and transverse spherical aberration of the lens...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28429520/performance-in-adolescents-of-the-two-japanese-serum-creatinine-based-estimated-glomerular-filtration-rate-equations-for-adults-and-paediatric-patients-a-study-of-the-japan-renal-biopsy-registry-and-japan-kidney-disease-registry-from-2007-to-2013
#7
Osamu Uemura, Hitoshi Yokoyama, Kenji Ishikura, Yoshimitsu Gotoh, Hiroshi Sato, Hitoshi Sugiyama, Masataka Honda, Seiichi Matsuo
There are two different Japanese serum creatinine-based equations for estimated glomerular filtration rate (eGFR), for adults and paediatric patients, with both equations deemed applicable to 18-year-old subjects. This study assessed the relative accuracy of the two equations in assessing eGFR in patients aged 18 years with chronic kidney disease. A total of 3042 patients (1679 males and 1363 females), aged 2-20 years, who were registered in the Japan Renal Biopsy Registry or the Japan Kidney Disease Registry between 2007 and 2013 were evaluated...
June 2017: Nephrology
https://www.readbyqxmd.com/read/28429269/alternative-carbon-dioxide-modelling-approaches-accounting-for-high-residual-gases-in-landgem
#8
Nathan Bruce, Kelvin Tsun Wai Ng, Amy Richter
High Canadian waste disposal rates necessitate landfill gas monitoring and accurate forecasting. CO2 estimates in LandGEM version 3.02 currently rest on the assumptions that CO2 is a function of CH4, where the two gases make up nearly 100% of landfill gas content, leading to overestimated CO2 collection estimates. A total of 25 cases (five formulas, five approaches) compared annual CO2 collection at four western Canadian landfills. Despite common use in literature, the 1:1 ratio of CH4 to CO2 was not recommended to forecast landfill gas collection in cold climates...
April 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28427356/postural-effects-on-intraocular-pressure-and-ocular-perfusion-pressure-in-patients-with-non-arteritic-anterior-ischemic-optic-neuropathy
#9
Jee Myung Yang, Sang Woo Park, Yong Sok Ji, Jaeryung Kim, Chungkwon Yoo, Hwan Heo
BACKGROUND: To investigate postural effects on intraocular pressure (IOP) and ocular perfusion pressure (OPP) in patients with non-arteritic ischemic optic neuropathy (NAION). METHODS: IOP and blood pressure (BP) were measured in 20 patients with unilateral NAION 10 min after changing to each of the following positions sequentially: sitting, supine, right lateral decubitus position (LDP), supine, left LDP, and supine. IOP was measured using a rebound tonometer and OPP was calculated using formulas based on mean BP...
April 20, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28422904/a-comparison-of-prognosis-calculators-for-geriatric-trauma-a-p-a-l-li-a-t-e-consortium-study
#10
Tarik D Madni, Akpofure Peter Ekeh, Scott C Brakenridge, Karen J Brasel, Bellal Joseph, Kenji Inaba, Brandon R Bruns, Jeffrey D Kerby, Joseph Cuschieri, M Jane Mohler, Paul A Nakonezny, Audra Clark, Jonathan Imran, Steven E Wolf, M Elizabeth Paulk, Ramona L Rhodes, Herb A Phelan
BACKGROUND: The nine-center PALLIATE consortium has validated the Geriatric Trauma Outcome Score (GTOS) as a prognosis calculator for injured elders. We compared GTOS' performance to that of the Trauma Injury Severity Score (TRISS) in a multicenter sample. METHODS: Three PALLIATE centers not submitting subjects to the GTOS validation study identified subjects aged 65 to 102 yrs admitted from 2000-2013. GTOS was specified using the formula [GTOS = age + (ISS x 2...
April 18, 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28421119/influences-of-realgar-indigo-naturalis-a-traditional-chinese-medicine-formula-on-the-main-cyp450-activities-in-rats-using-a-cocktail-method
#11
Huan-Hua Xu, Fei-Ran Hao, Mei-Xi Wang, Si-Jia Ren, Ming Li, Hong-Ling Tan, Yu-Guang Wang, Xiang-Lin Tang, Cheng-Rong Xiao, Qian-De Liang, Yue Gao, Zeng-Chun Ma
The purpose of this work was to study the influences of Realgar-Indigo naturalis (RIF) and its principal element realgar on 4 main cytochrome P450 enzymes activities in rats. A simple and efficient cocktail method was developed to detect the four probe drugs simultaneously. In this study, Wistar rats were administered intragastric RIF and realgar for 14 days; mixed probe drugs were injected into rats by caudal vein. Through analyzing the pharmacokinetic parameter of mixed probe drugs in rats, we can calculate the CYPs activities...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/28417471/assessing-the-impact-of-selection-bias-on-test-decisions-in-trials-with-a-time-to-event-outcome
#12
Marcia Viviane Rückbeil, Ralf-Dieter Hilgers, Nicole Heussen
If past treatment assignments are unmasked, selection bias may arise even in randomized controlled trials. The impact of such bias can be measured by considering the type I error probability. In case of a normally distributed outcome, there already exists a model accounting for selection bias that permits calculating the corresponding type I error probabilities. To model selection bias for trials with a time-to-event outcome, we introduce a new biasing policy for exponentially distributed data. Using this biasing policy, we derive an exact formula to compute type I error probabilities whenever an F-test is performed and no observations are censored...
April 17, 2017: Statistics in Medicine
https://www.readbyqxmd.com/read/28417009/revised-definition-of-predicted-left-ventricular-mass-using-ambulatory-blood-pressure-in-healthy-korean-adults
#13
Bae Keun Kim, Enshi Xu, Bo Youl Choi, Yonggu Lee, Soon Gil Kim, Yukio Yamori, Jinho Shin
BACKGROUND: Left ventricular hypertrophy is influenced by both hemodynamic and non-hemodynamic factors. Ambulatory blood pressure is correlated with left ventricular hypertrophy. We established the influences of hemodynamic and non-hemodynamic factors, including ambulatory blood pressure, on variation in left ventricular mass in healthy Korean adults. METHOD: We included 172 subjects (male = 71, female = 101), with normal body mass index and blood pressure, in an analysis of data from the Yangpyung and Yeoju cohort studies and a tertiary cardiovascular center...
2017: Clinical Hypertension
https://www.readbyqxmd.com/read/28416644/evaluation-of-different-estimation-methods-for-accuracy-and-precision-in-biological-assay-validation
#14
Binbing Yu, Harry Yang
Biological assays (bioassays) are procedures to estimate the potency of a substance by studying its effects on living organisms, tissues, and cells. Bioassays are essential tools for gaining insight into biologic systems and processes including, for example, the development of new drugs and monitoring environmental pollutants. Two of the most important parameters of bioassay performance are relative accuracy (bias) and precision. Although general strategies and formulas are provided in USP 〈1033〉, a comprehensive understanding of the definitions of bias and precision remain elusive...
April 17, 2017: PDA Journal of Pharmaceutical Science and Technology
https://www.readbyqxmd.com/read/28415264/self-energy-matrices-for-electron-transport-calculations-within-the-real-space-finite-difference-formalism
#15
Shigeru Tsukamoto, Tomoya Ono, Kikuji Hirose, Stefan Blügel
The self-energy term used in transport calculations, which describes the coupling between electrode and transition regions, is able to be evaluated only from a limited number of the propagating and evanescent waves of a bulk electrode. This obviously contributes toward the reduction of the computational expenses in transport calculations. In this paper, we present a mathematical formula for reducing the computational expenses further without using any approximation and without losing accuracy. So far, the self-energy term has been handled as a matrix with the same dimension as the Hamiltonian submatrix representing the interaction between an electrode and a transition region...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28415197/quantum-walks-the-first-detected-passage-time-problem
#16
H Friedman, D A Kessler, E Barkai
Even after decades of research, the problem of first passage time statistics for quantum dynamics remains a challenging topic of fundamental and practical importance. Using a projective measurement approach, with a sampling time τ, we obtain the statistics of first detection events for quantum dynamics on a lattice, with the detector located at the origin. A quantum renewal equation for a first detection wave function, in terms of which the first detection probability can be calculated, is derived. This formula gives the relation between first detection statistics and the solution of the corresponding Schrödinger equation in the absence of measurement...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28415190/density-functional-calculations-of-transport-properties-in-the-nondegenerate-limit-and-the-role-of-electron-electron-scattering
#17
Michael P Desjarlais, Christian R Scullard, Lorin X Benedict, Heather D Whitley, Ronald Redmer
We compute electrical and thermal conductivities of hydrogen plasmas in the nondegenerate regime using Kohn-Sham density functional theory (DFT) and an application of the Kubo-Greenwood response formula, and demonstrate that for thermal conductivity, the mean-field treatment of the electron-electron (e-e) interaction therein is insufficient to reproduce the weak-coupling limit obtained by plasma kinetic theories. An explicit e-e scattering correction to the DFT is posited by appealing to Matthiessen's Rule and the results of our computations of conductivities with the quantum Lenard-Balescu (QLB) equation...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28415170/variational-calculation-of-transport-coefficients-in-diffusive-lattice-gases
#18
Chikashi Arita, P L Krapivsky, Kirone Mallick
A diffusive lattice gas is characterized by the diffusion coefficient depending only on the density. The Green-Kubo formula for diffusivity can be represented as a variational formula, but even when the equilibrium properties of a lattice gas are analytically known, the diffusion coefficient can be computed only in the exceptional situation when the lattice gas is gradient. In the general case, minimization over an infinite-dimensional space is required. We propose an approximation scheme based on minimizing over finite-dimensional subspaces of functions...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28413834/synthesis-and-characterization-of-zinc-oxide-thin-films-for-optoelectronic-applications
#19
E Muchuweni, T S Sathiaraj, H Nyakotyo
Micro-ring structured zinc oxide (ZnO) thin films were prepared on glass substrates by spray pyrolysis and their structural, morphological, optical and electrical properties were investigated. X-ray Diffraction (XRD) analysis revealed the films' hexagonal wurtzite phase with a preferred (002) grain orientation. The mean crystallite size calculated on the basis of the Debye-Scherrer model was 24 nm and a small dislocation density of [Formula: see text] was obtained, indicating the existence of few lattice defects and good crystallinity...
April 2017: Heliyon
https://www.readbyqxmd.com/read/28413511/application-of-dead-space-fraction-to-titrate-optimal-positive-end-expiratory-pressure-in-an-ards-swine-model
#20
Weishuai Bian, Wei Chen, Yangong Chao, Lan Wang, Liming Li, Jian Guan, Xuefeng Zang, Jie Zhen, Bo Sheng, Xi Zhu
This study aimed to apply the dead space fraction [ratio of dead space to tidal volume (VD/VT)] to titrate the optimal positive end-expiratory pressure (PEEP) in a swine model of acute respiratory distress syndrome (ARDS). Twelve swine models of ARDS were constructed. A lung recruitment maneuver was then conducted and the PEEP was set at 20 cm H2O. The PEEP was reduced by 2 cm H2O every 10 min until 0 cm H2O was reached, and VD/VT was measured after each decrement step. VD/VT was measured using single-breath analysis of CO2, and calculated from arterial CO2 partial pressure (PaCO2) and mixed expired CO2 (PeCO2) using the following formula: VD/VT = (PaCO2 - PeCO2)/PaCO2...
April 2017: Experimental and Therapeutic Medicine
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