keyword
MENU ▼
Read by QxMD icon Read
search

Closing volume

keyword
https://www.readbyqxmd.com/read/29452868/chest-wall-dose-reduction-using-noncoplanar-volumetric-modulated-arc-radiation-therapy-for-lung-stereotactic-ablative-radiation-therapy
#1
Amy S Yu, Peter G Maxim, Billy W Loo, Michael F Gensheimer
PURPOSE: Stereotactic ablative radiation therapy (SABR) to lung tumors close to the chest wall can cause rib fractures or chest wall pain. We evaluated and propose a clinically practical solution of using noncoplanar volumetric modulated arc radiation therapy (VMAT) to reduce chest wall dose from lung SABR. METHODS AND MATERIALS: Twenty lung SABR VMAT plans in which the chest wall volume receiving 30 Gy or higher (V30) exceeded 30 mL were replanned by noncoplanar VMAT with opposite 15° couch kicks...
December 19, 2017: Practical Radiation Oncology
https://www.readbyqxmd.com/read/29451793/temporary-anion-states-of-ethene-interacting-with-single-molecules-of-methane-ethane-and-water
#2
Thomas Sommerfeld, Joshua B Melugin, Masahiro Ehara
When an excess electron is added into the π* orbital of ethene, the resulting anion decays by electron autodetachment---that is, it represents an electronic state referred to as a temporary anion or resonance state. Here the influence of a cluster environment on the energy and lifetime of this state is investigated. The clusters considered are ethene...CH 4 , ethene...C 2 H 6 , and ethene...H 2 O. Most of these clusters are systematically constructed so that the solvent interacts with the π system in a specific way, and are thus by construction not minima with respect to all intermolecular degrees of freedom...
February 16, 2018: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29450432/tracing-the-sources-of-pcdd-fs-in-baltic-sea-air-by-using-metals-as-source-markers
#3
Anteneh Assefa, Mats Tysklind, Jana Klanova, Karin Wiberg
The atmosphere is the major contributor of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in the Baltic Sea environment. In this study, we investigated the potential of using metals along with PCDD/Fs as markers of important emission sources of PCDD/Fs in air. The air concentrations of PCDD/F congeners (n = 17), other persistent organic pollutants (n = 8) and metals (n = 16) were determined in summer and winter air using high volume samplers at a rural field station (Aspvreten, Sweden) located close to the Baltic Sea coast...
February 16, 2018: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/29449014/periarticular-bone-predicts-knee-osteoarthritis-progression-data-from-the-osteoarthritis-initiative
#4
Grace H Lo, Erika Schneider, Jeffrey B Driban, Lori Lyn Price, David J Hunter, Charles B Eaton, Marc C Hochberg, Rebecca D Jackson, C Kent Kwoh, Michael C Nevitt, John A Lynch, Timothy E McAlindon
OBJECTIVE: Osteoarthritis (OA) is a disease with a substantial public health burden. Quantitative assessments of periarticular bone may be a biomarker capable of monitoring early disease progression. The purpose of this study was to evaluate whether measures of periarticular bone associate with longitudinal structural progression. METHODS: We conducted a 12-18 months longitudinal study using the Osteoarthritis Initiative (OAI). Participants received knee dual-energy x-ray absorptiometry (DXA), trabecular magnetic resonance (MR) imaging, and x-rays...
January 31, 2018: Seminars in Arthritis and Rheumatism
https://www.readbyqxmd.com/read/29448396/measuring-the-equations-of-state-in-a-relaxed-magnetohydrodynamic-plasma
#5
M Kaur, L J Barbano, E M Suen-Lewis, J E Shrock, A D Light, M R Brown, D A Schaffner
We report measurements of the equations of state of a fully relaxed magnetohydrodynamic (MHD) laboratory plasma. Parcels of magnetized plasma, called Taylor states, are formed in a coaxial magnetized plasma gun, and are allowed to relax and drift into a closed flux conserving volume. Density, ion temperature, and magnetic field are measured as a function of time as the Taylor states compress and heat. The theoretically predicted MHD and double adiabatic equations of state are compared to experimental measurements...
January 2018: Physical Review. E
https://www.readbyqxmd.com/read/29446086/subchondral-bone-morphology-in-the-metacarpus-of-racehorses-in-training-changes-with-distance-from-the-articular-surface-but-not-with-age
#6
Sandra Martig, Peta L Hitchens, Mark A Stevenson, R Chris Whitton
The repetitive large loads generated during high-speed training and racing commonly cause subchondral bone injuries in the metacarpal condyles of racehorses. Adaptive bone modelling leads to focal sclerosis at the site of highest loading in the palmar aspect of the metacarpal condyles. Information on whether and how adaptive modelling of subchondral bone changes during the career of a racehorse is sparse. The aim of this cross-sectional study was to describe the changes in subchondral bone micromorphology in the area of highest loading in the palmar aspect of the metacarpal condyle in thoroughbred racehorses as a function of age and training...
February 15, 2018: Journal of Anatomy
https://www.readbyqxmd.com/read/29445792/understanding-receptor-mediated-endocytosis-of-elastic-nanoparticles-through-coarse-grained-molecular-dynamic-simulation
#7
Zhiqiang Shen, Huilin Ye, Ying Li
For nanoparticle (NP)-based drug delivery platforms, the elasticity of the NPs has a significant influence on their blood circulation time and cellular uptake efficiency. However, due to the complexity of the endocytosis process and the inconsistency in the definition of elasticity for NPs in experiments, the understanding about the receptor-mediated endocytosis process of elastic NPs is still limited. In this work, we developed a coarse-grained molecular dynamics (CGMD) model for elastic NPs. The energy change of the elastic NPs can be precisely controlled by the bond, area, volume and bending potentials of this CGMD model...
February 15, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29444841/measuring-metabolic-rates-of-small-terrestrial-organisms-by-fluorescence-based-closed-system-respirometry
#8
Sean Tomlinson, Emma L Dalziell, Philip C Withers, Wolfgang Lewandrowski, Kingsley W Dixon, David J Merritt
We explore a recent innovative variation of closed-system respirometry for terrestrial organisms, whereby pO 2 is repeatedly measured fluorometrically in a constant-volume chamber over multiple time points. We outline a protocol that aligns this technology with the broader literature on aerial respirometry, including the calculations required to accurately convert O 2 depletion to metabolic rate (MR). We identify a series of assumptions, and sources of error associated with this technique, including thresholds where O 2 depletion becomes limiting, that impart errors to the calculation and interpretation of MR...
February 14, 2018: Journal of Experimental Biology
https://www.readbyqxmd.com/read/29443850/does-an-algorithmic-approach-to-using-brachytherapy-and-external-beam-radiation-result-in-good-function-local-control-rates-and-low-morbidity-in-patients-with-extremity-soft-tissue-sarcoma
#9
Jason Klein, Alex Ghasem, Samuel Huntley, Nathan Donaldson, Martin Keisch, Sheila Conway
BACKGROUND: High-dose-rate brachytherapy (HDR-BT) and external-beam radiation therapy (EBRT) are two modalities used in the treatment of soft tissue sarcoma. Previous work at our institution showed early complications and outcomes for patients treated with HDR-BT, EBRT, or a combination of both radiation therapy modalities. As the general indications for each of these approaches to radiation therapy differ, it is important to evaluate the use of each in an algorithmic way, reflecting how they are used in contemporary practice at sites that use these treatments...
March 2018: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/29443081/recombinant-collagen-i-peptide-microcarriers-for-cell-expansion-and-their-potential-use-as-cell-delivery-system-in-a-bioreactor-model
#10
Melva Suarez Muñoz, Davide Confalonieri, Heike Walles, Elisabeth M W M van Dongen, Gudrun Dandekar
Tissue engineering is a promising field, focused on developing solutions for the increasing demand on tissues and organs regarding transplantation purposes. The process to generate such tissues is complex, and includes an appropriate combination of specific cell types, scaffolds, and physical or biochemical stimuli to guide cell growth and differentiation. Microcarriers represent an appealing tool to expand cells in a three-dimensional (3D) microenvironment, since they provide higher surface-to volume ratios and mimic more closely the in vivo situation compared to traditional two-dimensional methods...
February 7, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29442351/milk-alkali-syndrome-mas-as-a-complication-of-the-treatment-of-hypoparathyroidism
#11
Agata Skwarek, Janusz Pachucki, Tomasz Bednarczuk, Zuzanna Żurecka, Michał Popow
Milk-alkali syndrome (MAS), characterized by renal failure, metabolic alkalosis and hypercalcemia, is a severe and life-threatening complication of the treatment of hypoparathyroidism. The clinical course is often sudden and is not preceded by any prodromal symptoms. Occurrence does not depend on the duration of hypoparathyroidism treatment, although it is closely related to the applied therapy, especially the dose of calcium carbonate and active vitamin D preparations. Drugs influencing the glomerular filtration rate (angiotensin receptor blockers, sartans, aldosterone receptor antagonists, thiazide diuretics), lack of adequate routine control, changing the calcium carbonate supplementation, dehydration, a diet rich in pH-basic foods (i...
February 14, 2018: Endokrynologia Polska
https://www.readbyqxmd.com/read/29442274/congenital-olfactory-impairment-is-linked-to-cortical-changes-in-prefrontal-and-limbic-brain-regions
#12
Helena Gásdal Karstensen, Martin Vestergaard, William F C Baaré, Arnold Skimminge, Bjarki Djurhuus, Bjarki Ellefsen, Norbert Brüggemann, Camilla Klausen, Anne-Mette Leffers, Niels Tommerup, Hartwig R Siebner
The human sense of smell is closely associated with morphological differences of the fronto-limbic system, specifically the piriform cortex and medial orbitofrontal cortex (mOFC). Still it is unclear whether cortical volume in the core olfactory areas and connected brain regions are shaped differently in individuals who suffer from lifelong olfactory deprivation relative to healthy normosmic individuals. To address this question, we examined if regional variations in gray matter volume were associated with smell ability in seventeen individuals with isolated congenital olfactory impairment (COI) matched with sixteen normosmic controls...
February 13, 2018: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/29437172/closed-loop-feedback-control-for-microfluidic-systems-through-automated-capacitive-fluid-height-sensing
#13
L R Soenksen, T Kassis, M Noh, L G Griffith, D L Trumper
Precise fluid height sensing in open-channel microfluidics has long been a desirable feature for a wide range of applications. However, performing accurate measurements of the fluid level in small-scale reservoirs (<1 mL) has proven to be an elusive goal, especially if direct fluid-sensor contact needs to be avoided. In particular, gravity-driven systems used in several microfluidic applications to establish pressure gradients and impose flow remain open-loop and largely unmonitored due to these sensing limitations...
February 13, 2018: Lab on a Chip
https://www.readbyqxmd.com/read/29433070/speed-speed-variation-and-crash-relationships-for-urban-arterials
#14
Xuesong Wang, Qingya Zhou, Mohammed Quddus, Tianxiang Fan, Shou'en Fang
Speed and speed variation are closely associated with traffic safety. There is, however, a dearth of research on this subject for the case of urban arterials in general, and in the context of developing nations. In downtown Shanghai, the traffic conditions in each direction are very different by time of day, and speed characteristics during peak hours are also greatly different from those during off-peak hours. Considering that traffic demand changes with time and in different directions, arterials in this study were divided into one-way segments by the direction of flow, and time of day was differentiated and controlled for...
February 9, 2018: Accident; Analysis and Prevention
https://www.readbyqxmd.com/read/29432387/quantification-of-phosphatidylethanols-in-whole-blood-as-a-proxy-for-chronic-alcohol-consumption-using-ultra-performance-convergence-chromatography-tandem-mass-spectrometry
#15
Bart C H van der Nagel, Sophie Wassenaar, Soma Bahmany, Birgit C P Koch
BACKGROUND: Detection of alcohol consumption after a longer period of time can be useful in certain patient groups. To monitor chronic alcohol consumption, a novel analytical method for the quantification of phosphatidylethanols (PEth) was developed and validated using ultra performance convergence chromatography tandem mass spectrometry. METHODS: The main phosphatidylethanols -Palmitoyl-2-oleoyl-sn-glycero-3-phosphoethanol (POPEth), 1-Palmitoyl-2-linoleoyl-sn-glycero-3-phosphoethanol (PLPEth), and 1,2-Dioleoyl-sn-glycero-3-phosphoethanol (DOPEth) were analyzed using a simple and fast sample preparation protocol followed by chromatographic separation using ultra performance convergence chromatography, a novel kind of supercritical fluid chromatography...
February 8, 2018: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/29431867/spatially-fractionated-grid-radiation-therapy-using-proton-pencil-beam-scanning-pbs-feasibility-study-and-clinical-implementation
#16
M Gao, M M Mohiuddin, W F Hartsell, M Pankuch
PURPOSE: GRID therapy is an effective treatment for bulky tumors. Linear accelerator (Linac)-produced photon beams collimated through blocks or multi-leaf collimators (MLCs) are the most common methods used to deliver this therapy. Utilizing the newest proton delivery method of pencil beam scanning (PBS) can further improve the efficacy of GRID therapy. In this study, we developed a method of delivering GRID therapy using proton PBS, evaluated the dosimetry of this novel technique and applied this method in two clinical cases...
February 12, 2018: Medical Physics
https://www.readbyqxmd.com/read/29430890/tricuspid-valve-replacement-results-of-an-orphan-procedure-which-is-the-best-prosthesis
#17
Dominik Wiedemann, Veronika Rupprechter, Julia Mascherbauer, Andreas Kammerlander, Bruno Mora, Kamen Dimitrov, Benedikt Weber, Martin Andreas, Günther Laufer, Alfred Kocher
BACKGROUND: Replacement of the tricuspid valve is uncommon. Prostheses specifically designed for the this position are not available. Bovine, porcine as well as mechanical valve prostheses are currently used, however, the most suitable prosthesis type has not been defined. METHODS: We retrospectively analyzed all consecutive patients who underwent tricuspid valve replacement (TVR) at the Medical University of Vienna from 1996 to 2014. Baseline patient characteristics, prosthesis type, and postoperative outcome data were collected...
February 8, 2018: Journal of Cardiovascular Surgery
https://www.readbyqxmd.com/read/29430495/a-comparison-of-the-postoperative-complications-between-two-drainage-methods-after-total-knee-arthroplasty
#18
Fardin Mirzatolooei, Ali Tabrizi, Maryamsadat Mokaram Gargari
Background: The role of wound drainage after total knee arthroplasty is still considered controversial as although closed drainage systems have been believed to be effective in decreasing the post-operative complications, they could also facilitate the bleeding and increase the rate of transfusion and infection. We have conducted the current study to compare the outcomes superficial subcutaneous, one deep, and two deep drain techniques after total knee arthroplasty. Methods: Between 2014 and 2015 sixty consecutive patients were prospectively selected and underwent primary total knee arthroplasty...
January 2018: Archives of Bone and Joint Surgery
https://www.readbyqxmd.com/read/29429921/comparison-of-lung-tumor-motion-measured-using-a-model-based-4dct-technique-and-a-commercial-protocol
#19
Dylan O'Connell, Narek Shaverdian, Amar U Kishan, David H Thomas, Tai H Dou, John H Lewis, James M Lamb, Minsong Cao, Stephen Tenn, Lee P Percy, Daniel A Low
PURPOSE: To compare lung tumor motion measured with a model-based technique to commercial 4-dimensional computed tomography (4DCT) scans and describe a workflow for using model-based 4DCT as a clinical simulation protocol. METHODS AND MATERIALS: Twenty patients were imaged using a model-based technique and commercial 4DCT. Tumor motion was measured on each commercial 4DCT dataset and was calculated on model-based datasets for 3 breathing amplitude percentile intervals: 5th to 85th, 5th to 95th, and 0th to 100th...
November 11, 2017: Practical Radiation Oncology
https://www.readbyqxmd.com/read/29428702/micromechanics-of-brain-white-matter-tissue-a-fiber-reinforced-hyperelastic-model-using-embedded-element-technique
#20
Seyed Abdolmajid Yousefsani, Amir Shamloo, Farzam Farahmand
A transverse-plane hyperelastic micromechanical model of brain white matter tissue was developed using the embedded element technique (EET). The model consisted of a histology-informed probabilistic distribution of axonal fibers embedded within an extracellular matrix, both described using the generalized Ogden hyperelastic material model. A correcting method, based on the strain energy density function, was formulated to resolve the stiffness redundancy problem of the EET in large deformation regime. The model was then used to predict the homogenized tissue behavior and the associated localized responses of the axonal fibers under quasi-static, transverse, large deformations...
February 3, 2018: Journal of the Mechanical Behavior of Biomedical Materials
keyword
keyword
25636
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"