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Formulas for calculation

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https://www.readbyqxmd.com/read/27904167/comparison-of-errors-of-35-weight-estimation-formulae-in-a-standard-collective
#1
M Hoopmann, K O Kagan, A Sauter, H Abele, P Wagner
Issue: The estimation of foetal weight is an integral part of prenatal care and obstetric routine. In spite of its known susceptibility to errors in cases of underweight or overweight babies, important obstetric decisions depend on it. In the present contribution we have examined the accuracy and error distribution of 35 weight estimation formulae within the normal weight range of 2500-4000 g. The aim of the study was to identify the weight estimation formulae with the best possible correspondence to the requirements of clinical routine...
November 2016: Geburtshilfe und Frauenheilkunde
https://www.readbyqxmd.com/read/27903952/how-readable-is-bph-treatment-information-on-the-internet-assessing-barriers-to-literacy-in-prostate-health
#2
Kevin Koo, Ronald L Yap
Information about benign prostatic hyperplasia (BPH) has become increasingly accessible on the Internet. Though the ability to find such material is encouraging, its readability and impact on informing patient decision making are not known. To evaluate the readability of Internet-based information about BPH in the context of website ownership and Health on the Net certification, three search engines were queried daily for 1 month with BPH-related keywords. Website ownership data and Health on the Net certification status were verified...
November 29, 2016: American Journal of Men's Health
https://www.readbyqxmd.com/read/27901149/co-oxidation-by-the-atomic-oxygen-on-silver-clusters-structurally-dependent-mechanisms-generating-free-or-chemically-bonded-co2
#3
Xizi Cao, Mengyi Chen, Jun Ma, Baoqi Yin, Xiaopeng Xing
Atomic oxygen on silver is the crucial active species in many catalytic oxidation processes, while it is a big challenge to explore the relationship between its activity and molecular-level structures in condensed phases. We carried out kinetic measurements of the gas phase reactions between AgnO(-) (n = 1-8) and CO, in which the oxygen atoms were predicted to be terminal ones in AgO(-) and Ag2O(-), in quasi-Ag-O-Ag chains for Ag3O(-) and Ag4O(-), and on the two-fold or three-fold bridging positions in AgnO(-) (n = 5-8)...
November 30, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27900958/renal-shear-wave-velocity-and-estimated-glomerular-filtration-rate-in-children-with-chronic-kidney-disease
#4
Costanza Bruno, Milena Brugnara, Rocco Micciolo, Mariangela Cecchetto, Michele Zuffante, Alessandra Bucci, Marco Zaffanello
A shear wave velocity (SWV) value obtained by the acoustic radiation force impulse technique depends on tissue elasticity. We investigated the relationship between SWV values and the estimated glomerular filtration rate (eGFR) in children with chronic kidney disease. A total of 29 patients were enrolled in the study. There were 18 primary and 11 secondary cases of vesicoureteral reflux. eGFR was calculated using Schwartz's formulas (2012). Partial eGFR for each kidney was assessed by multiplying the eGFR by the percentage of renal function measured by means of renal (99m)Tc-dimercaptosuccinic acid scintigraphy...
November 2016: Saudi Journal of Kidney Diseases and Transplantation
https://www.readbyqxmd.com/read/27899938/detailed-analysis-of-the-impact-of-age-on-the-qt-interval
#5
Simon W Rabkin, Xin-Bo Justin Cheng, Darby Js Thompson
OBJECTIVE: To analyze the effect of age on the ECG QT interval, an important predictor of cardiovascular mortality and drug-induced cardiac arrhythmias, and determine whether QT-heart rate correction formulae (QTc) have differential relationships with age and sex. METHODS: Data were examined from the US National Health and Nutrition Examination Survey (NHANES) II and III, civilian population aged 25 to 90 years. QT weighted means and standard deviations were calculated for all ages...
September 2016: Journal of Geriatric Cardiology: JGC
https://www.readbyqxmd.com/read/27897141/measured-and-monte-carlo-simulated-electron-backscatter-to-the-monitor-chamber-for-the-varian-truebeam-linac
#6
Samantha A M Lloyd, Isabelle M Gagne, Magdalena Bazalova-Carter, Sergei Zavgorodni
To accurately simulate therapeutic electron beams using Monte Carlo methods, backscatter from jaws into the monitor chamber must be accounted for via the backscatter factor, S b. Measured and simulated values of S b for the TrueBeam are investigated. Two approaches for measuring S b are presented. Both require service mode operation with the dose and pulse forming networking servos turned off in order to assess changes in dose rate with field size. The first approach samples an instantaneous dose rate, while the second approach times the delivery of a fixed number of monitor units to assess dose rate...
November 29, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27895478/biosynthesis-characterization-and-evaluation-of-bioactivities-of-leaf-extract-mediated-biocompatible-silver-nanoparticles-from-an-early-tracheophyte-pteris-tripartita-sw
#7
Xavierravi Baskaran, Antony Varuvel Geo Vigila, Thangaraj Parimelazhagan, Doulathabad Muralidhara-Rao, Shouzhou Zhang
The objective of the study was to characterize silver nanoparticles (Ag-NPs) and their bioactivities in early tracheophytes (Pteridophyta). Aqueous leaf extract of a critically endangered fern, Pteris tripartita Sw., was used for one-step green synthesis of Ag-NPs. The biosynthesized Ag-NPs were characterized using ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, and high-resolution transmission electron microscopy...
2016: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/27895355/prediction-of-asialoglycoprotein-receptors-by-correlated-liver-function-parameters-before-hepatectomy
#8
Wen Jing, Jiang Li, Li Qin Tao, Jia Zhe, Li Bao Liang, Zhang Ke
Flow cytometric analysis of asialoglycoprotein receptor (ASGPR) levels on the surface of hepatocytes, which were obtained from the liver specimens of patients that received hepatectomy, were used as predictors of liver dysfunction after major hepatectomy for primary hepatocellular carcinoma (HCC) in Chinese patients, based on our previous study which confirmed the value of ASGPR levels on the surface of hepatocytes in evaluating the liver reserve function. The current study was planned to establish a conversion formula for the value of ASGPR with correlated liver function parameters...
October 2016: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/27895266/a-simple-method-to-estimate-the-time-dependent-receiver-operating-characteristic-curve-and-the-area-under-the-curve-with-right-censored-data
#9
Liang Li, Tom Greene, Bo Hu
The time-dependent receiver operating characteristic curve is often used to study the diagnostic accuracy of a single continuous biomarker, measured at baseline, on the onset of a disease condition when the disease onset may occur at different times during the follow-up and hence may be right censored. Due to right censoring, the true disease onset status prior to the pre-specified time horizon may be unknown for some patients, which causes difficulty in calculating the time-dependent sensitivity and specificity...
November 27, 2016: Statistical Methods in Medical Research
https://www.readbyqxmd.com/read/27894526/simplifying-optimal-tooth-size-calculations-and-communications-between-practitioners
#10
Daniel S German, Stephen J Chu, Michelle L Furlong, Alpesh Patel
The purpose of this article is to present a simple method for determining the optimal sizes of anterior teeth. This is needed because of the frequency of anomalous and missing maxillary lateral incisors. In addition to anomalous and missing incisors, other factors that create challenges for the dentist and orthodontist when designing an esthetic and occlusally sound dentition are attrition, trauma, transposition, erosion, and caries. Optimal esthetics and occlusion require correctly sized teeth in proportion to themselves and the other teeth...
December 2016: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/27893004/genetic-and-environmental-factors-associated-with-the-ganglion-cell-complex-in-a-healthy-aging-british-cohort
#11
Edward Bloch, Ekaterina Yonova-Doing, Eneh Jones-Odeh, Katie M Williams, Diana Kozareva, Christopher J Hammond
Importance: Measurement of ganglion cell complex (GCC) thickness may be more sensitive than current methods for glaucoma diagnosis and research. However, little is known about the factors influencing GCC thickness in the general population. Objectives: To investigate the heritability of and factors associated with GCC thickness in a healthy aging population. Design, Setting, and Participants: A cross-sectional twin study was conducted from August 27, 2014, to March 31, 2016, among 1657 participants of white British ancestry from the TwinsUK study cohort without ocular pathologic conditions...
November 17, 2016: JAMA Ophthalmology
https://www.readbyqxmd.com/read/27891446/requirements-for-minimum-sample-size-for-sensitivity-and-specificity-analysis
#12
REVIEW
Mohamad Adam Bujang, Tassha Hilda Adnan
Sensitivity and specificity analysis is commonly used for screening and diagnostic tests. The main issue researchers face is to determine the sufficient sample sizes that are related with screening and diagnostic studies. Although the formula for sample size calculation is available but concerning majority of the researchers are not mathematicians or statisticians, hence, sample size calculation might not be easy for them. This review paper provides sample size tables with regards to sensitivity and specificity analysis...
October 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/27891331/association-of-diabetic-nephropathy-and-liver-disorders
#13
Usha Sachidananda Adiga, B N Malawadi
INTRODUCTION: Liver disorder is known to be a risk factor for Diabetes Mellitus (DM) and diabetic patients are at risk of developing liver disorders. Association of liver and renal disease is less explored in the field of research; hence, we conducted a retrospective study on this. AIM: To compare the renal and liver profiles of type II DM patients compared to healthy controls and find the association between the two profiles in diabetics. MATERIALS AND METHODS: The renal and liver profiles of 68 type II DM patients and 58 controls were compared...
October 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/27888923/determination-of-time-of-death-in-forensic-science-via-a-3-d-whole-body-heat-transfer-model
#14
Catherine Bartgis, Alexander M LeBrun, Ronghui Ma, Liang Zhu
This study is focused on developing a whole body heat transfer model to accurately simulate temperature decay in a body postmortem. The initial steady state temperature field is simulated first and the calculated weighted average body temperature is used to determine the overall heat transfer coefficient at the skin surface, based on thermal equilibrium before death. The transient temperature field postmortem is then simulated using the same boundary condition and the temperature decay curves at several body locations are generated for a time frame of 24h...
December 2016: Journal of Thermal Biology
https://www.readbyqxmd.com/read/27888499/structural-and-electronic-properties-of-two-dimensional-stanene-and-graphene-heterostructure
#15
Liyuan Wu, Pengfei Lu, Jingyun Bi, Chuanghua Yang, Yuxin Song, Pengfei Guan, Shumin Wang
Structural and electronic properties of two-dimensional stanene and graphene heterostructure (Sn/G) are studied by using first-principles calculations. Various supercell models are constructed in order to reduce the strain induced by the lattice mismatch. The results show that stanene interacts overall weakly with graphene via van der Waals (vdW) interactions. Multiple phases of different crystalline orientation of stanene and graphene could coexist at room temperature. Moreover, interlayer interactions in stanene and graphene heterostructure can induce tunable band gaps at stanene's Dirac point, and weak p-type and n-type doping of stanene and graphene, respectively, generating a small amount of electron transfer from stanene to graphene...
December 2016: Nanoscale Research Letters
https://www.readbyqxmd.com/read/27886430/the-muddle-of-ages-turnover-transit-and-residence-times-in-the-carbon-cycle
#16
Carlos A Sierra, Markus Müller, Holger Metzler, Stefano Manzoni, Susan E Trumbore
Comparisons among ecosystem models or ecosystem dynamics along environmental gradients commonly rely on metrics that integrate different processes into a useful diagnostic. Terms such as age, turnover, residence, and transit times are often used for this purpose; however, these terms are variably defined in the literature and in many cases, calculations ignore assumptions implicit in their formulas. The aim of this opinion piece was i) to make evident these discrepancies and the incorrect use of formulas, ii) highlight recent results that simplify calculations and may help to avoid confusion, and iii) propose the adoption of simple and less ambiguous terms...
November 7, 2016: Global Change Biology
https://www.readbyqxmd.com/read/27884842/predictors-of-in-hospital-mortality-among-patients-with-pulmonary-tuberculosis-a-protocol-of-systematic-review-and-meta-analysis-of-observational-studies
#17
Carlos Podalirio Borges de Almeida, Rachel Couban, Sun Makosso Kallyth, Vagner Kunz Cabral, Samantha Craigie, Jason Walter Busse, Denise Rossato Silva
INTRODUCTION: Tuberculosis (TB) continues to be a major public health issue worldwide, with 1.4 million deaths occurring annually. There is uncertainty regarding which factors are associated with in-hospital mortality among patients with pulmonary TB. This knowledge gap complicates efforts to identify and improve the management of those individuals with TB at greatest risk of death. The aim of this systematic review and meta-analysis is to establish predictors of in-hospital mortality among patients with pulmonary TB to enhance the evidence base for public policy...
November 24, 2016: BMJ Open
https://www.readbyqxmd.com/read/27883334/effect-of-cation-dopants-in-zirconia-on-interfacial-properties-in-nickel-zirconia-systems-an-atomistic-modeling-study
#18
Albert M Iskandarov, Yingna Ding, Yoshitaka Umeno
Cation doping is often used to stabilize the cubic or tetragonal phase of zirconia for enhanced thermomechanical and electrochemical properties. In the present paper we report a combined density functional theory (DFT) and molecular dynamics study of the effect of Sc, Y, and Ce dopants on properties of Ni/[Formula: see text] interfaces and nickel sintering. First, we develop an MD model that is based on DFT data for various nickel/zirconia interfaces. Then, we employ the model to simulate Ni nanoparticles coalescing on a zirconia surface...
November 24, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27883143/the-role-of-stoichiometry-in-superconducting-nb1-%C3%AE-sn%C3%AE-electronic-and-vibrational-properties-from-ab-initio-calculations
#19
F Gala, G De Marzi, L Muzzi, G Zollo
Using first principles calculations based on density functional theory, the electronic, vibrational and superconducting properties of compounds with different stoichiometry ratios in the A15 phase have been studied. To this purpose, the λ mass enhancement parameter, which determines the superconducting critical temperature through the Allen-Dynes modification of the McMillan formula, has been explicitly calculated in the context of the density functional perturbation theory that allows the calculation of the matrix elements of the electron-phonon interactions at different compositions related to the Sn content...
November 24, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27882896/optical-response-of-a-line-node-semimetal
#20
J P Carbotte
We calculate the AC optical response of a line node semimetal with emphasis on characteristic behaviours which can be used to distinguish them from point node materials such as Dirac and Weyl semimetals. The interband optical background at zero temperature displays a flat region at small photon energies ([Formula: see text]) analogue to the universal background seen in graphene. However, in contrast to graphene, the height of the constant region is not universal but depends inversely on the Fermi velocity of the charge carriers and directly on the radius (b) in momentum space of the nodal circle...
November 24, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
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