keyword
MENU ▼
Read by QxMD icon Read
search

Microstructure

keyword
https://www.readbyqxmd.com/read/28107621/a-molecular-dynamics-study-of-water-flow-across-multiple-layers-of-pristine-oxidized-and-mixed-regions-of-graphene-oxide
#1
Jon Alexander Lewis Willcox, Hyung J Kim
A molecular dynamics graphene oxide model is used to shed light on commonly overlooked features of graphene oxide membranes. The model features both perpendicular and parallel water flow across multiple sheets of pristine and/or oxidized graphene to simulate "brick-and-mortar" microstructures. Additionally, regions of pristine/oxidized graphene overlap which have thus far been overlooked in the literature are explored. Differences in orientational and hydrogen-bonding features between adjacent layers of water in this mixed region are found to be even more prominent than differences between pristine and oxidized channels...
January 20, 2017: ACS Nano
https://www.readbyqxmd.com/read/28107493/white-matter-abnormalities-in-two-different-subtypes-of-amnestic-mild-cognitive-impairment
#2
Jianghong Liu, Peipeng Liang, Linlin Yin, Ni Shu, Tengda Zhao, Yi Xing, Fangyu Li, Zhilian Zhao, Kuncheng Li, Ying Han
White matter (WM) degeneration has been found during the course of cognitive decline in both Alzheimer's disease (AD) and amnestic mild cognitive impairment (aMCI), however, it is unclear whether there are different WM microstructural abnormalities between two subtypes of aMCI, including single domain aMCI (aMCI-s) and multiple domain aMCI (aMCI-m). Thirty-two patients of aMCI single-domain (aMCI-s), twenty-three patients of aMCI multiple-domain (aMCI-m) and twenty-three healthy normal controls (NC) participated in this study...
2017: PloS One
https://www.readbyqxmd.com/read/28107247/plaque-burden-microstructures-and-compositions-underachieving-very-low-ldl-c-levels
#3
Yu Kataoka, Jordan Andrews, Rishi Puri, Peter J Psaltis, Stephen J Nicholls
PURPOSE OF REVIEW: To summarize the impact of lowering LDL-C on plaque progression, microstructures and compositions. RECENT FINDINGS: Low-density lipoprotein cholesterol (LDL-C) is a major therapeutic target to prevent atherosclerotic cardiovascular disease. Intravascular imaging has elucidated antiatherosclerotic effects of lowering LDL-C in vivo. Intensive control of LDL-C with a statin has been shown to slow plaque progression and induce its regression if very low LDL-C level is achieved...
January 19, 2017: Current Opinion in Endocrinology, Diabetes, and Obesity
https://www.readbyqxmd.com/read/28106934/neuroimaging-the-neural-correlates-of-increased-risk-for-substance-use-disorders-in-attention-deficit-hyperactivity-disorder-a-systematic-review
#4
Vitria Adisetiyo, Kevin M Gray
BACKGROUND/OBJECTIVES: Children with attention-deficit/hyperactivity disorder (ADHD) are nearly three times more likely to develop substance use disorders (SUD) than their typically developing peers. Our objective was to review the existing neuroimaging research on high-risk ADHD (ie, ADHD with disruptive behavior disorders, familial SUD and/or early substance use), focusing on impulsivity as one possible mechanism underlying SUD risk. METHODS: A PubMed literature search was conducted using combinations of the keywords "ADHD," "substance use," "substance use disorder," "SUD," "addiction," "dependence," "abuse," "risk," "brain" "MRI," "imaging" and "neuroimaging...
January 20, 2017: American Journal on Addictions
https://www.readbyqxmd.com/read/28106219/surface-and-interface-engineering-of-fept-c-nanocatalysts-for-electro-catalytic-methanol-oxidation-enhanced-activity-and-durability
#5
Junmei Wang, Zhenlei Wang, Shuai Li, Rongming Wang, Yujun Song
A methodology by coupling a microfluidic-batch process with in situ carbon-black mixing, successive annealing and de-alloying post-treatment was developed for engineering surface and interface microstructures of FePt/C nanocomposites. Ultra-small angular FePt nanocrystals rich in vertexes/terraces/steps and with Pt contents gradually increasing from the inner to the outer part can be synthesized at certain Fe/Pt atomic ratios (2/1 or 1.1/1), which can directly grow on carbon-black for enhanced nanocrystal-carbon interface interaction by introducing the in situ carbon-black mixing process...
January 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28106132/m-otdr-sensing-system-based-on-3d-encoded-microstructures
#6
Qizhen Sun, Fan Ai, Deming Liu, Jianwei Cheng, Hongbo Luo, Kuan Peng, Yiyang Luo, Zhijun Yan, Perry Ping Shum
In this work, a quasi-distributed sensing scheme named as microstructured OTDR (M-OTDR) by introducing ultra-weak microstructures along the fiber is proposed. Owing to its relative higher reflectivity compared with the backscattered coefficient in fiber and three dimensional (3D) i.e. wavelength/frequency/time encoded property, the M-OTDR system exhibits the superiorities of high signal to noise ratio (SNR), high spatial resolution of millimeter level and high multiplexing capacity up to several ten thousands theoretically...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28106127/-225-%C3%AE-habit-planes-in-martensitic-steels-from-the-ptmc-to-a-continuous-model
#7
Annick P Baur, Cyril Cayron, Roland E Logé
Fine twinned microstructures with {225}γ habit planes are commonly observed in martensitic steels. The present study shows that an equibalanced combination of twin-related variants associated to the Kurdjumov-Sachs orientation relationship is equivalent to the Bowles and Mackenzie's version of the PTMC for this specific {225}γ case. The distortion associated to the Kurdjumov-Sachs orientation relationship results from a continuous modeling of the FCC-BCC transformation. Thus, for the first time, an atomic path can be associated to the PTMC...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28105707/binge-drinking-differentially-affects-cortical-and-subcortical-microstructure
#8
Laurel S Morris, Nicholas G Dowell, Mara Cercignani, Neil A Harrison, Valerie Voon
Young adult binge drinkers represent a model for endophenotypic risk factors for alcohol misuse and early exposure to repeated binge cycles. Chronic or harmful alcohol use leads to neurochemical, structural and morphological neuroplastic changes, particularly in regions associated with reward processing and motivation. We investigated neural microstructure in 28 binge drinkers compared with 38 matched healthy controls. We used a recently developed diffusion magnetic resonance imaging acquisition and analysis, which uses three-compartment modelling (of intracellular, extracellular and cerebrospinal fluid) to determine brain tissue microstructure features including neurite density and orientation dispersion index (ODI)...
January 20, 2017: Addiction Biology
https://www.readbyqxmd.com/read/28105632/the-micro-taphonomy-of-cold-differential-microcracking-in-response-to-experimental-cold-stresses
#9
Chantal Turpin
Cold is a central feature of environments at higher latitudes and elevations. Thus, cold-induced taphonomic changes are relevant in many forensic contexts. Fifty-two lamb bone segments were used to assess the impact of cold, freeze-thaw cycles, freeze-drying, and water immersion on microstructural cracking of bone in a series of controlled exposure experiments. For each bone segment, three thin sections were examined under a light microscope. Cold exposure caused taphonomic changes in the form of microscopic cracking...
January 20, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28105383/a-3d-contact-analysis-approach-for-the-visualization-of-the-electrical-contact-asperities
#10
Constantinos C Roussos, Jonathan Swingler
The electrical contact is an important phenomenon that should be given into consideration to achieve better performance and long term reliability for the design of devices. Based upon this importance, the electrical contact interface has been visualized as a ''3D Contact Map'' and used in order to investigate the contact asperities. The contact asperities describe the structures above and below the contact spots (the contact spots define the 3D contact map) to the two conductors which make the contact system...
January 2017: AIP Advances
https://www.readbyqxmd.com/read/28105085/effects-of-shen-an-granules-on-wnt-signaling-pathway-in-mouse-models-of-diabetic-nephropathy
#11
Xin-Rong Zou, Xiao-Qin Wang, Ying-Lin Hu, Hui-Lan Zhou
The effect of Shen'an granules on the Wnt signaling pathway in renal tissues of mouse models of streptozotocin (STZ)-induced diabetic nephropathy was investigated in the present study. A total of 62 BALB/c mice were randomly divided into the normal control (A group), model (B group), losartan (C group), low-dose Shen'an granules (D group), and high-dose Shen'an granules (E group) groups. The mouse model of diabetic nephropathy was established by a single intraperitoneal injection of STZ (150 mg/kg). The animals were treated with drugs for 8 weeks, and blood creatinine, blood urea nitrogen, triglycerides (TG), and total cholesterol (CHOL) were measured prior to and after treatment...
December 2016: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28104754/how-does-passive-lengthening-change-the-architecture-of-the-human-medial-gastrocnemius-muscle
#12
Bart Bolsterlee, Arkiev D'Souza, Simon C Gandevia, Robert D Herbert
There are few comprehensive investigations of the changes in muscle architecture that accompany muscle contraction or change in muscle length in vivo. For this study, we measured changes in the three-dimensional architecture of the human medial gastrocnemius at the whole-muscle level, the fascicle level and the fiber level using anatomical MRI and diffusion tensor imaging (DTI). Data were obtained from eight subjects under relaxed conditions at three muscle lengths. At the whole muscle level, a 5.1% increase in muscle belly length resulted in a reduction in both muscle width (mean change -2...
January 19, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28102529/recovery-from-chemotherapy-induced-white-matter-changes-in-young-breast-cancer-survivors
#13
Thibo Billiet, Louise Emsell, Mathieu Vandenbulcke, Ronald Peeters, Daan Christiaens, Alexander Leemans, Wim Van Hecke, Ann Smeets, Frederic Amant, Stefan Sunaert, Sabine Deprez
In a previous longitudinal diffusion tensor imaging (DTI) study, we observed cerebral white matter (WM) alterations (reduced fractional anisotropy (FA)) related to decreased cognitive performance 3-5 months after chemotherapy-treatment (t2) when compared to baseline (t1) (Deprez et al. in Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology, 30(3), 274-281. doi:10.1200/JCO.2011.36.8571, 2012). The current study investigates the evolution and the nature of these previously observed microstructural changes...
January 19, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28102528/alteration-of-gray-matter-microstructure-in-schizophrenia
#14
Seitz Johanna, Rathi Yogesh, Lyall Amanda, Pasternak Ofer, Del Re Elisabetta C, Niznikiewicz Margaret, Nestor Paul, J Seidman Larry, L Petryshen Tracey, I Mesholam-Gately Raquelle, Wojcik Joanne, W McCarley Robert, E Shenton Martha, K Koerte Inga, Kubicki Marek
Neuroimaging studies demonstrate gray matter (GM) macrostructural abnormalities in patients with schizophrenia (SCZ). While ex-vivo and genetic studies suggest cellular pathology associated with abnormal neurodevelopmental processes in SCZ, few in-vivo measures have been proposed to target microstructural GM organization. Here, we use diffusion heterogeneity- to study GM microstructure in SCZ. Structural and diffusion magnetic resonance imaging (MRI) were acquired on a 3 Tesla scanner in 46 patients with SCZ and 37 matched healthy controls (HC)...
January 19, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28102327/super-strong-materials-for-temperatures-exceeding-2000%C3%A2-%C3%A2-c
#15
Laura Silvestroni, Hans-Joachim Kleebe, William G Fahrenholtz, Jeremy Watts
Ceramics based on group IV-V transition metal borides and carbides possess melting points above 3000 °C, are ablation resistant and are, therefore, candidates for the design of components of next generation space vehicles, rocket nozzle inserts, and nose cones or leading edges for hypersonic aerospace vehicles. As such, they will have to bear high thermo-mechanical loads, which makes strength at high temperature of great importance. While testing of these materials above 2000 °C is necessary to prove their capabilities at anticipated operating temperatures, literature reports are quite limited...
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28101853/investigation-on-the-effects-of-the-formation-of-a-silver-flower-like-structure-on-graphene
#16
Rozalina Zakaria, Siti Fatimah Az Zahra Yusoff, Kok Chung Law, Chin Seong Lim, Harith Ahmad
In this report, we experimentally investigate the formation of "flower-like silver structures" on graphene. Using an electrochemical deposition technique with deposition times of 2.5 and 5 min, agglomerations of silver nanoparticles (AgNPs) were deposited on the graphene surfaces, causing the formation of "flower-like structures" on the graphene substrate. Localized surface plasmon resonance (LSPR) was observed in the interaction between the structures and the graphene substrate. The morphology of the samples was observed using a field-emission scanning electron microscope (FESEM) and Raman spectroscopy...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28101467/some-qualitative-and-rheological-properties-of-virgin-olive-oil-apple-vinegar-salad-dressing-stabilized-with-xanthan-gum
#17
Solmaz Abedinzadeh, Mohammadali Torbati, Sodeif Azadmard-Damirchi
Purpose: Lipid oxidation and rheological properties are the main qualitative parameters determined in food emulsions. Salad dressings are food emulsions important in our daily diet, but conventional salad dressings have high amounts of cholesterol and saturated fatty acids because of egg yolk in their formulations. There are many studies on the modification of salad dressing formulations to replace egg yolk and saturated fats. The present study describes new formulation of salad dressing with olive oil and apple vinegar to produce a functional food product...
December 2016: Advanced Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/28101146/bone-health-in-hiv-and-hepatitis-b-or-c-infections
#18
REVIEW
Emmanuel Biver, Alexandra Calmy, René Rizzoli
Chronic infections with human immunodeficiency virus (HIV), hepatitis B virus (HBV) or hepatitis C virus (HCV) add to age-dependent bone loss and may contribute to lower bone strength in the elderly. In this review, we report recent highlights on the epidemiology of bone fragility in chronic viral infections with HIV, HCV and HBV, its physiopathology and discuss the interference of antiviral therapies with bone metabolism. Chronic infections influence bone through the interactions between risk factors for bone fragility and falls (which are highly prevalent in infected patients), virus activity and antiviral drugs...
January 2017: Therapeutic Advances in Musculoskeletal Disease
https://www.readbyqxmd.com/read/28099315/factors-associated-with-visual-outcome-after-macula-off-rhegmatogenous-retinal-detachment-surgery
#19
Dae Hyun Park, Kyung Seek Choi, Hae Jung Sun, Sung Jin Lee
PURPOSE: To evaluate preoperative factors influencing the visual outcome and postoperative factors associated with the changes in visual acuity, after reattachment surgery to treat macula-off rhegmatogenous retinal detachment. METHODS: A total of 180 eyes of 180 patients who underwent reattachment surgery to treat macula-off rhegmatogenous retinal detachment, and who were followed up for more than 12 months, were reviewed retrospectively. Preoperative and postoperative characteristics, including optical coherence tomography findings, were comprehensively analyzed using univariate and multivariate models to evaluate preoperative factors influencing best-corrected visual acuity 12 months after macula-off rhegmatogenous retinal detachment surgery and postoperative factors associated with changes in best-corrected visual acuity after surgery...
January 17, 2017: Retina
https://www.readbyqxmd.com/read/28098960/a-hollow-spherical-carbon-derived-from-the-spray-drying-of-corncob-lignin-for-high-rate-performance-supercapacitors
#20
Zheng-Ze Pan, Liubing Dong, Wei Lv, Dequn Zheng, Zhengjie Li, Chong Luo, Cheng Zheng, Quan-Hong Yang, Feiyu Kang
Controlling the microstructure of biomass-derived carbon is of essential importance for directing its use. Herein, a hollow spherical carbon (HSC) was prepared from corncob lignin through spray drying and the subsequent heat treatment. The HSC, which is characterized by the hierarchically porous structure, delivers high rate capability when it is directly used as the electrode material for supercapacitors. This strategy that uses lignin as the precursor avoids the intrinsic difficulty in tuning the micro-structure of the biomass-derived carbons and is suitable for mass production for practical use...
January 18, 2017: Chemistry, An Asian Journal
keyword
keyword
55359
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"