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Diffusion weighted

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https://www.readbyqxmd.com/read/28736866/antibacterial-activity-of-fusion-from-biosynthesized-acidocin-silver-nanoparticles-and-its-application-for-eggshell-decontamination
#1
A B Abeer Mohammed, Mahmoud A Al-Saman, Ahmed A Tayel
Bacteriocins from lactic acid bacteria (LAB) are useful to control the persistent development of pathogenic microorganisms in food and medicine fields. The bacteriocin acidocin was extracted from Lactobacillus acidophilus M1 that was isolated from fermented milk, purified using ammonium sulphate fractionation, and gel filtration column chromatography using Sephadex matrix and applied as a potential antibacterial agent. The molecular weight of the purified acidocin was estimated using SDS-PAGE to be 6.6 kDa...
July 24, 2017: Journal of Basic Microbiology
https://www.readbyqxmd.com/read/28736481/gas-uptake-of-3-d-printed-acrylonitrile-butadiene-styrene-abs-using-a-vacuum-apparatus-designed-for-absorption-and-desorption-studies
#2
Makfir Sefa, Zeeshan Ahmed, James A Fedchak, Julia Scherschligt, Nikolai Klimov
We describe a vacuum apparatus for determining the outgassing rate into vacuum, the diffusion coefficient, and the amount of gas absorbed for various materials. The diffusion coefficient is determined from a model applied to time-dependent desorption data taken using a throughput method. We used this method to determine the diffusion coefficient, D, for H2O in 3-D printed acrylonitrile butadiene styrene (ABS). We found DH2O = 8.3 × 10(-8) cm(2)/s ± 1.3 × 10(-8) cm(2)/s (k = 1; 67% confidence interval) at 23...
November 2016: Journal of Vacuum Science & Technology. A, Vacuum, Surfaces, and Films
https://www.readbyqxmd.com/read/28736471/comparison-of-multi-fiber-reproducibility-of-pas-mri-and-q-ball-with-empirical-multiple-b-value-hardi
#3
Vishwesh Nath, Kurt G Schilling, Justin A Blaber, Zhaohua Ding, Adam W Anderson, Bennett A Landman
Crossing fibers are prevalent in human brains and a subject of intense interest for neuroscience. Diffusion tensor imaging (DTI) can resolve tissue orientation but is blind to crossing fibers. Many advanced diffusion-weighted magnetic resolution imaging (MRI) approaches have been presented to extract crossing-fibers from high angular resolution diffusion imaging (HARDI), but the relative sensitivity and specificity of approaches remains unclear. Here, we examine two leading approaches (PAS and q-ball) in the context of a large-scale, single subject reproducibility study...
February 11, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28736302/beyond-pegylation-alternative-surface-modification-of-nanoparticles-with-mucus-inert-biomaterials
#4
Vitaliy V Khutoryanskiy
Mucus is a highly hydrated viscoelastic gel present on various moist surfaces in our body including the eyes, nasal cavity, mouth, gastrointestinal, respiratory and reproductive tracts. It serves as a very efficient barrier that prevents harmful particles, viruses and bacteria from entering the human body. However, the protective function of the mucus also hampers the diffusion of drugs and nanomedicines, which dramatically reduces their efficiency. Functionalisation of nanoparticles with low molecular weight poly(ethylene glycol) (PEGylation) is one of the strategies to enhance their penetration through mucus...
July 20, 2017: Advanced Drug Delivery Reviews
https://www.readbyqxmd.com/read/28735913/gray-matter-abnormalities-of-the-dorsal-posterior-cingulate-in-sleep-walking
#5
Anna Heidbreder, Ambra Stefani, Elisabeth Brandauer, Ruth Steiger, Christian Kremser, Elke R Gizewski, Peter Young, Werner Poewe, Birgit Högl, Christoph Scherfler
OBJECTIVE: This study aimed to determine whether voxel-based analysis of T1 weighted magnetic resonance imaging (MRI) and diffusion tensor imaging is able to detect alterations of gray and white matter morphometry as well as measures of mean diffusivity and fractional anisotropy in patients with non-rapid eye movement parasomnia. METHODS: 3 Tesla MRI was performed in 14 drug-free, polysomnography-confirmed adult patients with non-rapid eye movement parasomnia (age: 29 ± 4...
August 2017: Sleep Medicine
https://www.readbyqxmd.com/read/28735215/estimation-of-individual-axon-bundle-properties-by-a-multi-resolution-discrete-search-method
#6
Ricardo Coronado-Leija, Alonso Ramirez-Manzanares, Jose Luis Marroquin
A stable, accurate and robust-to-noise method for the estimation of the intra-voxel bundle-wise diffusion properties for diffusion-weighted magnetic resonance imaging is presented. The proposed method overcomes some of the limitations of most of the multi-fiber algorithms in the literature and extends them to estimate the diffusion profiles, improving the estimation of the intra-voxel geometry at challenging microstructure configurations, that is to say: relatively small crossing angles, different voxel-wise anisotropic diffusion profiles and low SNR...
June 29, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28734955/predicting-the-nodal-status-in-gastric-cancers-the-role-of-apparent-diffusion-coefficient-histogram-characteristic-analysis
#7
Song Liu, Yujuan Zhang, Jie Xia, Ling Chen, Wenxian Guan, Yue Guan, Yun Ge, Jian He, Zhengyang Zhou
PURPOSE: To explore the application of histogram analysis in preoperative T and N staging of gastric cancers, with a focus on characteristic parameters of apparent diffusion coefficient (ADC) maps. MATERIALS AND METHODS: Eighty-seven patients with gastric cancers underwent diffusion weighted magnetic resonance imaging (b=0, 1000s/mm(2)), which generated ADC maps. Whole-volume histogram analysis was performed on ADC maps and 7 characteristic parameters were obtained...
July 19, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28734460/affected-anatomical-rich-club-and-structural-functional-coupling-in-young-offspring-of-schizophrenia-and-bipolar-disorder-patients
#8
Guusje Collin, Lianne H Scholtens, René S Kahn, Manon H J Hillegers, Martijn P van den Heuvel
BACKGROUND: Emerging evidence suggests disruptions in the wiring organization of the brain's network in schizophrenia (SZ) and bipolar disorder (BD). As the importance of genetic predisposition has been firmly established in these illnesses, children (offspring) of patients constitute an at-risk population. This study examines connectome organization in children at familial high risk for psychosis. METHODS: Diffusion-weighted magnetic resonance imaging scans were collected from 127 nonpsychotic offspring 8 to 18 years of age (average age = 13...
June 21, 2017: Biological Psychiatry
https://www.readbyqxmd.com/read/28734146/diagnostic-value-of-whole-body-diffusion-weighted-mri-compared-to-computed-tomography-for-pre-operative-assessment-of-patients-suspected-for-ovarian-cancer
#9
Katrijn Michielsen, Raphaëla Dresen, Ragna Vanslembrouck, Frederik De Keyzer, Frédéric Amant, Elvier Mussen, Karin Leunen, Patrick Berteloot, Philippe Moerman, Ignace Vergote, Vincent Vandecaveye
BACKGROUND: Despite excellent per-lesion performance for peritoneal staging, the additional clinical value of diffusion-weighted magnetic resonance imaging (DWI/MRI) compared to computed tomography (CT) remains to be established in ovarian cancer. Our purpose was to evaluate whole body (WB)-DWI/MRI for diagnosis, staging and operability assessment of patients suspected for ovarian cancer compared to CT. METHODS: One hundred and sixty-one patients suspected for ovarian carcinoma underwent 3 T WB-DWI/MRI and contrast-enhanced CT...
July 19, 2017: European Journal of Cancer
https://www.readbyqxmd.com/read/28732897/preparation-and-characterization-of-novel-chitosan-and-%C3%AE-cyclodextrin-polymer-sponges-for-wound-dressing-applications
#10
Claudia Flores, Marco Lopez, Nicolas Tabary, Christel Neut, Feng Chai, Didier Betbeder, Clément Herkt, Frederic Cazaux, Valerie Gaucher, Bernard Martel, Nicolas Blanchemain
Chitosan (CS) presents antibacterial, mucoadhesive and hemostatic properties and is an ideal candidate for wound dressing applications. This work reports the development of sponge-like materials obtained from physical hydrogels after the interaction between CS and a β-cyclodextrin polymer (PCD) in acidic conditions to provoke immediate gelation. Characterization consisted of zeta potential (ZP) measurements, rheology analysis, Fourier transform infrared (FTIR), Raman spectroscopy, wide angle X-ray scattering (WAXS) and scanning electron microscopy (SEM)...
October 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28732086/risk-of-stomach-cancer-in-aotearoa-new-zealand-a-m%C3%A4-ori-population-based-case-control-study
#11
Lis Ellison-Loschmann, Andrew Sporle, Marine Corbin, Soo Cheng, Pauline Harawira, Michelle Gray, Tracey Whaanga, Parry Guilford, Jonathan Koea, Neil Pearce
Māori, the indigenous people of New Zealand, experience disproportionate rates of stomach cancer, compared to non-Māori. The overall aim of the study was to better understand the reasons for the considerable excess of stomach cancer in Māori and to identify priorities for prevention. Māori stomach cancer cases from the New Zealand Cancer Registry between 1 February 2009 and 31 October 2013 and Māori controls, randomly selected from the New Zealand electoral roll were matched by 5-year age bands to cases...
2017: PloS One
https://www.readbyqxmd.com/read/28732003/-diffuse-type-of-gastric-cancer-adenocarcinoma-in-10-years-old-boy-report-of-a-case
#12
Nery Romero, Ingrid Zegarra, Hugo Delgado
We report a rare case of diffuse type of gastric cancer with signet ring cells in 10 years old boy who was admitted with a 12 months history with weight loss, dysphagia to solids first and to liquids later, anorexia, fatigue, dizziness, vomiting and later, with pain in the left upper quadrant. On examination, he appeared pale, malnourished, with café-au- lait spots over the trunk and extremities. Laboratory tests showed; Hb 7.5 g, albumin 2.62 g, Thevenon positive on stools. Abdominal ultrasound examination showed periaortic masses and diffuse space occupying lesions in the liver...
April 2017: Revista de Gastroenterología del Perú: órgano Oficial de la Sociedad de Gastroenterología del Perú
https://www.readbyqxmd.com/read/28731571/model-based-investigation-on-the-mass-transfer-and-adsorption-mechanisms-of-mono-pegylated-lysozyme-in-ion-exchange-chromatography
#13
Josefine Morgenstern, Gang Wang, Pascal Baumann, Jürgen Hubbuch
Recent studies highlighted the potential of PEGylated proteins to improve stabilities and pharmacokinetics of protein drugs. Ion-exchange chromatography (IEX) is among the most frequently used purification methods for PEGylated proteins. However, the underlying physical mechanisms allowing for a separation of different PEGamers (proteins with a varying number of attached PEG molecules) are not yet fully understood. In this work, mechanistic chromatography modeling was applied to gain a deeper understanding of the mass transfer and adsorption/desorption mechanisms of mono-PEGylated proteins in IEX...
July 21, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28730570/structural-connectivity-differences-in-essential-tremor-with-and-without-resting-tremor
#14
Maria Eugenia Caligiuri, Gennarina Arabia, Gaetano Barbagallo, Angela Lupo, Maurizio Morelli, Rita Nisticò, Fabiana Novellino, Andrea Quattrone, Maria Salsone, Basilio Vescio, Andrea Cherubini, Aldo Quattrone
In this work, we investigated motor network structure in patients affected by essential tremor (ET) with or without resting tremor, using probabilistic tractography of the cerebello-thalamo-basal ganglia-cortical loop. Twenty-five patients with ET, twenty-two patients with ET associated with resting tremor (rET), and twenty-five age- and sex-matched healthy controls were included in the study. All participants underwent whole-brain 3D T1-weighted and diffusion-weighted MRI, and DAT-SPECT. Probabilistic tractography was performed on diffusion data in network mode, reconstructing connections between the different structures of the cerebello-thalamo-basal ganglia-cortical loop...
July 20, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28730254/giant-abdominal-lipofibroma-case-presentation
#15
Liliana Coldea, Alina Liliana Pintea, Adrian LaurenŢiu Stupariu, Carmen Corina Roman-Filip, Florin Grosu
Abdominal lipomas are benign mesenchymal tumors of mature fatty tissue that may appear at any age. We present the case of a 58-year-old patient with a cardiovascular pathology, who presented with diffuse abdominal pains, asthenia, anterior thorax pains and palpitations, abdomen increase, symptoms that had an insidious onset. The clinical and imagistic examinations suggested the diagnosis of giant abdominal lipoma. The surgical intervention allowed the excision of an encapsulated tumor, of 250÷220÷230 mm, relatively well encapsulated, with a macroscopic aspect of section adipose tissue, with hard whitish areas, with a 12...
2017: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
https://www.readbyqxmd.com/read/28729936/are-there-differences-in-brain-morphology-according-to-handedness
#16
Han Jang, Jae Youn Lee, Kang Il Lee, Kang Min Park
OBJECTIVE: This study aimed to investigate the differences in brain morphology according to handedness. MATERIALS AND METHODS: Forty-two healthy subjects were enrolled (21 right-handers and 21 nonright-handers). The two groups were classified according to the Edinburgh Handedness Inventory. Measures of cortical morphology, such as thickness, surface area, volume, and curvature, and the volumes of subcortical structures, such as the amygdala, caudate, hippocampus, globus pallidus, putamen, and thalamus, were compared between the groups according to handedness using whole-brain 3D T1-weighted MRI...
July 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28729470/detection-and-monitoring-of-lung-inflammation-in-cystic-fibrosis-during-respiratory-tract-exacerbation-using-diffusion-weighted-magnetic-resonance-imaging
#17
Pierluigi Ciet, Silvia Bertolo, Mirco Ros, Eleni Rosalina Andrinopoulou, Valentina Tavano, Francesca Lucca, Thorsten Feiweier, Gabriel P Krestin, Harm A W M Tiddens, Giovanni Morana
The aim was to investigate whether diffusion-weighted magnetic resonance imaging (DWI) detects and monitors inflammatory and lung function changes during respiratory tract exacerbations (RTE) treatment in patients with cystic fibrosis (CF).29 patients with RTE underwent DWI pre- and post-antibiotic treatment. A control group of 27 stable patients, matched for age and sex, underwent DWI with the same time gap as those undergoing RTE treatment. Clinical status and lung function were assessed at each DWI time point...
July 2017: European Respiratory Journal: Official Journal of the European Society for Clinical Respiratory Physiology
https://www.readbyqxmd.com/read/28729182/correlation-of-quantitative-mr-imaging-findings-with-symptoms-in-patients-with-incidentally-detected-inflammatory-sinonasal-disease
#18
O Kilickesmez, O Onerci Celebi, M Yalcinkaya, A R Gokduman, Y Karagoz, O Yigit
PURPOSE: To assess the relationships between mucosal thickness, T1-weighted, T2-weighted signals and restricted diffusion on magnetic resonance imaging (MRI) with the degree of symptoms in patients with incidentally detected inflammatory sinonasal disease. MATERIALS AND METHODS: Conventional and diffusion-weighted MRI of 100 patients with incidental sinonasal mucosal thickening were prospectively evaluated. There were 53 men and 47 women, with a mean age of 44.6 years±15...
July 17, 2017: Diagnostic and Interventional Imaging
https://www.readbyqxmd.com/read/28729164/antenatal-antipsychotic-exposure-induces-multigenerational-and-gender-specific-programming-of-adiposity-and-glucose-tolerance-in-adult-mouse-offspring
#19
E Courty, P Gobalakichenane, M Garcia, A Muscat, C Kazakian, T Ledent, M Moldes, B Blondeau, D Mitanchez, M Buyse, B Fève
Second-generation antipsychotics (SGAs) are well known for their metabolic side effects in humans, including obesity and diabetes. These compounds are maintained during pregnancy to prevent the relapse of psychoses, but they readily diffuse across the placenta to the fetus, as documented with the widely-prescribed drug olanzapine (OLZ). However, observational studies have provided conflicting results on the potential impact of SGAs on fetal growth and body weight, and their effects on metabolic regulation in the offspring...
July 17, 2017: Diabetes & Metabolism
https://www.readbyqxmd.com/read/28728757/value-of-whole-lesion-apparent-diffusion-coefficient-adc-first-order-statistics-and-texture-features-in-clinical-staging-of-cervical-cancers
#20
Y Guan, W Li, Z Jiang, B Zhang, Y Chen, X Huang, J Zhang, S Liu, J He, Z Zhou, Y Ge
AIM: To explore the value of whole-lesion apparent diffusion coefficient (ADC) first-order statistics and texture features in clinical staging of cervical cancers. MATERIALS AND METHODS: Fifty-six women (mean age, 51 years) with histopathologically confirmed cervical cancers underwent 3 T pelvic magnetic resonance imaging including diffusion-weighted imaging (b=0, 800 s/mm(2)) prospectively. The ADC first-order statistics and texture features derived from the whole volume of cervical cancers were correlated with International Federation of Gynecology and Obstetrics (FIGO) stages (i...
July 18, 2017: Clinical Radiology
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