32,557 results match your criteria thickness measurements

Functionalized Graphene/Nickel/Polyaniline Ternary Nanocomposites: Fabrication and Application as Electromagnetic Wave Absorbers.

Langmuir 2021 Jun 11. Epub 2021 Jun 11.

Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur-721302, West Bengal, India.

The evolution of high electromagnetic absorption materials is essential in the fast growing electronic industry in overcoming electromagnetic pollution. In view of this, a series of Ni nanoparticle-decorated functionalized graphene sheets (FG/Ni) are synthesized by a solvothermal method using different ratios of FG/Ni precursors. Subsequently, FG/Ni is subjected to in situ polymerization of aniline to form FG/Ni/PANI ternary composites and characterized. Read More

View Article and Full-Text PDF

Cortical Thickness, Bone Density, and the Insertion Torque/Depth Integral: A Study Using Polyurethane Foam Blocks.

Int J Oral Maxillofac Implants 2021 May-Jun;36(3):423-431

Purpose: Bone density and implant primary stability parameters have been introduced that are based on calculating (1) the average of the instantaneous torque needed to keep the rotation speed of a bone density probe constant while it descends into bone or (2) the integral of the instantaneous torque-depth curve at implant insertion (I), a quantity that is equal to the insertion energy multiplied by a constant. This study aimed to determine how these two quantities are affected by the presence and thickness of a cortical bone layer.

Materials And Methods: An instantaneous torque-measuring micromotor was used to measure the density of six double-layer polyurethane foam blocks mimicking different cortical/cancellous bone combinations. Read More

View Article and Full-Text PDF

Quantifying thermal transport in buried semiconductor nanostructures cross-sectional scanning thermal microscopy.

Nanoscale 2021 Jun 11. Epub 2021 Jun 11.

Physics Department, Lancaster University, LA1 4YB, UK. and Material Science Institute, Lancaster University, Lancaster, LA1 4YB, UK.

Managing thermal transport in nanostructures became a major challenge in the development of active microelectronic, optoelectronic and thermoelectric devices, stalling the famous Moore's law of clock speed increase of microprocessors for more than a decade. To find the solution to this and linked problems, one needs to quantify the ability of these nanostructures to conduct heat with adequate precision, nanoscale resolution, and, essentially, for the internal layers buried in the 3D structure of modern semiconductor devices. Existing thermoreflectance measurements and "hot wire" 3ω methods cannot be effectively used at lateral dimensions of a layer below a micrometre; moreover, they are sensitive mainly to the surface layers of a relatively high thickness of above 100 nm. Read More

View Article and Full-Text PDF

Stepwise regression of non-culprit lipid-rich plaque observed using serial near-infrared spectroscopy-intravascular ultrasound and optical coherence tomographic measurements after aggressive cholesterol-lowering treatment: a case report.

Eur Heart J Case Rep 2021 Mar 16;5(3):ytab095. Epub 2021 Mar 16.

Department of Cardiovascular Biology and Medicine, Juntendo University Graduate School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.

Background: Lipid-rich plaques (LRP) in the non-culprit lesions (NCL) in patients with the acute coronary syndrome may trigger lesion-related, adverse cardiovascular events. Aggressive lipid-lowering therapy may stabilize LRP; however, the times of stabilization remain undefined.

Case Summary: A 60-year-old man presented with unstable angina. Read More

View Article and Full-Text PDF

Intra-iliac bone marrow injection as a novel alternative to intra-tibial inoculation in rat model.

Stem Cell Res Ther 2021 Jun 10;12(1):336. Epub 2021 Jun 10.

Department of Pathology, Faculty of Veterinary Medicine, Cairo University, Giza, 12211, Egypt.

Background: Intra-bone marrow injection (IBMI) in rats is adopted in many studies for stem cell and hematopoietic cell transplantation. IBMI in the tibia or the femur results in severe distress to the animal. Therefore, this study aims to evaluate intra-iliac injections as an alternative approach for IBMI. Read More

View Article and Full-Text PDF

Early cardiac electrical and structural changes in patients with non-obese non-alcoholic fatty liver disease.

Kardiologiia 2021 May 31;61(5):51-58. Epub 2021 May 31.

Department of Cardiology, Faculty of Medicine, Kahramanmars Sutcu Imam University, Kahramanmaras, Turkey.

Background    Obese non-alcoholic fatty liver disease (NAFLD) was found to increase the risk of developing atrial fibrillation (AF) regardless of the metabolic syndrome subgroups that may accompany it. In this study, the effect of NAFLD on the structural and electrical functions of the heart was investigated using tissue Doppler echocardiography (TDE) in non-obese NAFLD patients without any known risk factors for AF.Material and methods    The study included 43 female patients (31. Read More

View Article and Full-Text PDF

assessment of periapical lesions created in sheep mandibles by using high resolution ultrasonography and cone beam computed tomography.

Dentomaxillofac Radiol 2021 Jun 10:20210048. Epub 2021 Jun 10.

Dept of Biostatistics, Faculty of Medicine, Hacettepe University, Ankara, Turkey.

Objectives: Providing ultrasound images of periapical lesions may be problematic depending on the thickness of the overlying cortical bone. Clinically, it is crucial to determine the cut-off value of overlaying bone thickness in terms of interference with ultrasound imaging in conjunction with assessment of changes in periapical jaw bone lesions. Our aim was to determine the minimum amount of overlaying buccal bone thickness of artificial periapical lesions in order to be visible by ultrasound imaging and to compare width, height, depth, surface area and volume measurements of detectable periapical lesions obtained from ultrasound and CBCT images. Read More

View Article and Full-Text PDF

Anterior Chamber Measurements in Healthy Children: A Cross-Sectional Study Using Optical Coherence Tomography.

Transl Vis Sci Technol 2021 May;10(6):13

University of Leicester Ulverscroft Eye Unit, Department of Neuroscience, Psychology and Behaviour, University of Leicester, Leicester, UK.

Purpose: To establish anterior chamber measurements in children and investigate the influence of demographic factors on anterior chamber development.

Methods: Handheld optical coherence tomography was used to scan the anterior chamber of participants' eyes, without sedation. ImageJ was used to generate quantitative anterior chamber measurements, including central corneal thickness (CCT), anterior chamber width, trabecular meshwork length (TML), Schwalbe's line-angle opening distance (SL-AOD), and trabecular iris surface area (SL-TISA). Read More

View Article and Full-Text PDF

Focal Loss Analysis of Nerve Fiber Layer Reflectance for Glaucoma Diagnosis.

Transl Vis Sci Technol 2021 May;10(6)

Casey Eye Institute, Oregon Health & Science University, Portland, OR, USA.

Purpose: To evaluate nerve fiber layer (NFL) reflectance for glaucoma diagnosis.

Methods: Participants were imaged with 4.5 × 4. Read More

View Article and Full-Text PDF

Advanced Retinal Imaging and Ocular Parameters of the Rhesus Macaque Eye.

Transl Vis Sci Technol 2021 May;10(6)

Department of Ophthalmology & Vision Science, School of Medicine, University of California-Davis, Sacramento, CA, USA.

Purpose: To determine the range of normal ocular biometry and perform advanced retinal imaging and functional assessment of the rhesus macaque eye.

Methods: We performed ocular phenotyping on rhesus macaques at the California National Primate Research Center. This process consisted of anterior and posterior segment eye examination by ophthalmologists, advanced retinal imaging, and functional retinal electrophysiology. Read More

View Article and Full-Text PDF

Interplay between Interparticle Potential and Adsorption Structure in Nanoparticle Dispersions with Polymer Addition as Displayed by Small-Angle Scattering.

Langmuir 2021 Jun 10. Epub 2021 Jun 10.

Toyota Central R&D Labs., Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan.

The effect of polymer adsorption on the dispersion stability of particles is an important subject applicable to various manufacturing processes. In this study, small-angle scattering was used to examine the relationship between interparticle potential and polymer adsorption in dispersions of nanoparticles with an 81 Å radius containing two types of polymers. Small-angle X-ray scattering (SAXS) measurements in a silica/polyacrylamide (PAAm) system showed an increase in interparticle attractive interactions as PAAm concentration was increased. Read More

View Article and Full-Text PDF

Direct Comparison of Three Buckling-Based Methods to Measure the Elastic Modulus of Nanobiocomposite Thin Films.

ACS Appl Mater Interfaces 2021 Jun 10. Epub 2021 Jun 10.

Department of Chemistry and Chemical Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada.

To engineer tunable thin-film materials, the accurate measurement of their mechanical properties is crucial. However, characterizing the elastic modulus with current methods is particularly challenging for sub-micrometer thick films and hygroscopic materials because they are highly sensitive to environmental conditions and most methods require free-standing films which are difficult to prepare. In this work, we directly compared three buckling-based methods to determine the elastic moduli of supported thin films: (1) biaxial thermal shrinking, (2) uniaxial thermal shrinking, and (3) the mechanically compressed, strain-induced elastic buckling instability for mechanical measurements (SIEBIMM) method. Read More

View Article and Full-Text PDF

Automated procedure for slice thickness verification of computed tomography images: Variations of slice thickness, position from iso-center, and reconstruction filter.

J Appl Clin Med Phys 2021 Jun 9. Epub 2021 Jun 9.

Department of Applied Physics and Medical Imaging, California State University Channel Islands, Camarillo, CA, USA.

Purpose: The purpose of this study is to automate the slice thickness verification on the AAPM CT performance phantom and validate it for variations of slice thickness, position from iso-center, and reconstruction filter.

Methods: An automatic procedure for slice thickness verification on AAPM CT performance phantom was developed using MATLAB R2015b. The stair object image within the phantom was segmented, and the middle stair object was located. Read More

View Article and Full-Text PDF

Factors Associated with Carotid Atherosclerosis and Achilles Tendon Thickness in Japanese Patients with Familial Hypercholesterolemia: A Subanalysis of the Familial Hypercholesterolemia Expert Forum (FAME) Study.

J Atheroscler Thromb 2021 Jun 10. Epub 2021 Jun 10.

Department of Cardiovascular Medicine, Osaka University Graduate School of Medicine.

Aims: Familial hypercholesterolemia (FH) is characterized by high low-density lipoprotein (LDL) cholesterol levels, xanthomas including Achilles tendon thickening, and premature coronary artery disease (CAD). Carotid intima-media thickness (IMT) is a well-established surrogate marker for CAD in FH and Achilles tendon thickening is a specific physical finding in patients with FH. The objective of the present study was to identify factors associated with carotid IMT and Achilles tendon thickness in FH heterozygotes on lipid-lowering therapy. Read More

View Article and Full-Text PDF


Cesk Slov Oftalmol 2020 ;1(Ahead of print):1001-1009

Excimer laser refractive surgery is a procedure performed worldwide to solve refractive errors and reduce dependence on glasses or contact lenses. There has been an increase in the number of procedures performed around the world. Myopia is the most common indication for corneal photorefractive surgery. Read More

View Article and Full-Text PDF

Raman Confocal Microscopy and biophysics multi-parametric characterization of the skin barrier evolution with age.

J Biophotonics 2021 Jun 9:e202100107. Epub 2021 Jun 9.

"Lipides: Systèmes Analytiques et Biologiques" Lip(Sys)2 interdisciplinary unit, Faculty of Pharmacy, University Paris-Saclay, Châtenay-Malabry.

Skin aging is a multifactorial phenomenon that involves alterations at the molecular, cellular, and tissue levels. Our aim was to carry out a multiparametric biophysical and Raman characterization of skin barrier between individuals of different age groups (<24 and > 70 years old). Our results showed a significant decrease of lipids to proteins ratio overall the thickness of the SC and higher lateral packing in the outer part of the SC for elderly. Read More

View Article and Full-Text PDF

In vivo Sensing of Rabbit Cornea by Terahertz Technology.

J Biophotonics 2021 Jun 9:e202100130. Epub 2021 Jun 9.

Singapore Eye Research Institute, Singapore.

Terahertz (THz) spectroscopy was applied to investigate eight rabbit corneas in vivo. One eye of each rabbits' corneas was edema induced; the other eye of the corneas served as the control. Electromagnetic field simulation shows that THz wave could propagate certain distance and information from cornea sublayers could be reviewed. Read More

View Article and Full-Text PDF

Thickness of the particle-free layer near charged interfaces in suspensions of like-charged nanoparticles.

Soft Matter 2021 Jun 9. Epub 2021 Jun 9.

Department of Inorganic and Analytical Chemistry, University of Geneva, Sciences II, 30 Quai Ernest-Ansermet, 1205 Geneva, Switzerland.

When a suspension of charged nanoparticles is in contact with a like-charged water-solid interface, next to this interface a particle-free layer is formed. The present study provides reliable measurements of the thickness of this particle-free layer with three different techniques, namely optical reflectivity, quartz crystal microbalance (QCM), and direct force measurements with atomic force microscopy (AFM). Suspensions of negatively charged nanoparticles of different size and type are investigated. Read More

View Article and Full-Text PDF

Visceral adiposity and inflammatory bowel disease.

Int J Colorectal Dis 2021 Jun 9. Epub 2021 Jun 9.

Department of Gastroenterology, Beaumont Hospital, Beaumont Rd, Dublin, Ireland.

Background: Rates of obesity are increasing worldwide, as is the incidence of inflammatory bowel disease (IBD). Obesity is now considered an inflammatory state. Visceral adiposity in particular may be associated with a more severe inflammatory phenotype in IBD. Read More

View Article and Full-Text PDF

Morphometric evaluation and measurements of primary pterygium by anterior segment optical coherence tomography and its relation with astigmatism.

Ther Adv Ophthalmol 2021 Jan-Dec;13:25158414211020145. Epub 2021 May 31.

Department of Ophthalmology, Himalayan Institute of Medical Sciences, Swami Rama Himalayan University, Dehradun, India.

Purpose: To evaluate the relationship between measurements and various morphometric parameters of primary pterygium on anterior segment optical coherence tomography(AS-OCT) and refractive and keratometric astigmatism.

Methods: In this cross-sectional study, patients with primary pterygium were included. The AS-OCT parameters of pterygium consisting of epithelial thickness near apex(µm), apical or head thickness(µm), its thickness at limbus(µm), horizontal length of pterygium(mm), central corneal thickness (µm) and maximum pterygium thickness(mm) were evaluated. Read More

View Article and Full-Text PDF

Effects of hormone replacement therapy on endothelial function, arterial stiffness and myocardial deformation in women with Turner syndrome.

J Hypertens 2021 Jun 4. Epub 2021 Jun 4.

Endocrine Unit, 2nd Department of Internal Medicine Propaedeutic, Research Institute and Diabetes Center 2nd Department of Cardiology 2nd Department of Internal Medicine Propaedeutic, Research Institute and Diabetes Center, Attikon University Hospital, National and Kapodistrian University of Athens, Athens, Greece.

Objectives: Turner syndrome (TS) is associated with increased cardiovascular risk. We investigated whether hormone replacement therapy (HRT) affects endothelial function, arterial stiffness and myocardial deformation in women with TS.

Methods: Twenty-five women with TS were studied in the estrogen phase of the HRT and two months after discontinuation of HRT. Read More

View Article and Full-Text PDF

Clinical and Morphologic Characteristics of ERK Inhibitor-Associated Retinopathy.

Ophthalmol Retina 2021 Jun 5. Epub 2021 Jun 5.

Ophthalmic Oncology Service; Department of Medicine.

Purpose: Investigate clinical and morphologic characteristics of serous retinal disturbances in patients taking extracellular signal-regulated kinase (ERK) inhibitors.

Participants: Of 61 patients receiving ERK inhibitors for treatment of metastatic cancer, this study included 40 eyes of 20 patients with evidence of retinopathy confirmed by optical coherence tomography (OCT).

Design: Single center, retrospective study of prospectively collected data METHODS: Clinical exam, fundus photography and OCT were used to evaluate ERK inhibitor retinopathy. Read More

View Article and Full-Text PDF

Infection with Batrachochytrium dendrobatidis reduces salamander capacity to mount a cell-mediated immune response.

J Exp Zool A Ecol Integr Physiol 2021 Jun 8. Epub 2021 Jun 8.

Department of Biology, Allegheny College, Meadville, Pennsylvania, USA.

The vertebrate immune system is a costly defense system that is responsible for preventing and eliminating parasites and pathogens. Theory predicts that hosts experience tradeoffs associated with immune deployment and other physiological functions. Although empirical evidence for immune-physiology tradeoffs are well documented in the literature, fewer studies have examined tradeoffs within the immune system in wild vertebrates. Read More

View Article and Full-Text PDF

A new method for the study of biophysical and morphological parameters in 3D cell cultures: Evaluation in LoVo spheroids treated with crizotinib.

PLoS One 2021 8;16(6):e0252907. Epub 2021 Jun 8.

Institute of Molecular Genetics "Luigi Luca Cavalli-Sforza", Unit of Bologna, CNR, Bologna, Italy.

Three-dimensional (3D) culture systems like tumor spheroids represent useful in vitro models for drug screening and more broadly for cancer biology research, but the generation of uniform populations of spheroids remains challenging. The possibility to properly characterize spheroid properties would increase the reliability of these models. To address this issue different analysis were combined: i) a new device and relative analytical method for the accurate, simultaneous, and rapid measurement of mass density, weight, and size of spheroids, ii) confocal imaging, and iii) protein quantification, in a clinically relevant 3D model. Read More

View Article and Full-Text PDF

Ambient-Stable Two-Dimensional CrI Organic-Inorganic Encapsulation.

ACS Nano 2021 Jun 8. Epub 2021 Jun 8.

Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States.

Two-dimensional transitional metal halides have recently attracted significant attention due to their thickness-dependent and electrostatically tunable magnetic properties. However, this class of materials is highly reactive chemically, which leads to irreversible degradation and catastrophic dissolution within seconds in ambient conditions, severely limiting subsequent characterization, processing, and applications. Here, we impart long-term ambient stability to the prototypical transition metal halide CrI by assembling a noncovalent organic buffer layer, perylenetetracarboxylic dianhydride (PTCDA), which templates subsequent atomic layer deposition (ALD) of alumina. Read More

View Article and Full-Text PDF

Ultrasound measurements of abdominal muscle thickness are associated with postmenstrual age at full oral feedings in preterm infants: A preliminary study.

Nutr Clin Pract 2021 Jun 8. Epub 2021 Jun 8.

Department of Pediatrics, University of Minnesota-Twin Cities, Minneapolis, Minnesota, USA.

Background: A premature infant's discharge from the neonatal intensive care unit (NICU) is dependent on factors such as respiratory stability, adequate growth, and the ability to consume oral feeds. Once infants have achieved respiratory stability, a tool that can better predict age at discharge is desirable. Thus, we conducted a secondary data analysis to assess the association between ultrasound measurements of abdominal muscle thickness and postmenstrual age (PMA) at full oral feedings. Read More

View Article and Full-Text PDF

Bone level changes around implants with one- or three-millimeters high abutments and its relation to crestal mucosal thickness. A one year randomized clinical trial.

J Clin Periodontol 2021 Jun 7. Epub 2021 Jun 7.

Department of Periodontology, Universitat International de Catalunya, Barcelona, Spain.

Objective: To evaluate the 1-year bone level changes around subcrestal platform switching implants with 1- or 3-mm definitive abutments. The influence of mucosal thickness on bone level alterations was further analyzed.

Material And Methods: Implants were placed in the posterior sextants and positioned 1. Read More

View Article and Full-Text PDF

First Report of Aloe vera Rust Caused by Uromyces aloes in an Ornamental Nursery in the United States.

Plant Dis 2021 Jun 8. Epub 2021 Jun 8.

Penn State University, Plant Pathology, University Park, Pennsylvania, United States;

Aloe vera (L.) Burm. f. Read More

View Article and Full-Text PDF

Examination of the effects of COVID 19 on corneal endothelium.

Graefes Arch Clin Exp Ophthalmol 2021 Jun 7. Epub 2021 Jun 7.

Department Ophthalmology, Dicle University Medical Faculty, 21280, Sur/Dıyarbakır, Turkey.

Purpose: To demonstrate the effects of the disease on the corneal endothelium in individuals recovering from COVID-19 through specular microscopy.

Methods: Eighty individuals recovering from COVID-19 (group 1) and 72 healthy controls (group 2) were included in this prospective study. After examining visual acuity, refractive defect detection, anterior and posterior segment examinations, and specular microscopy measurements were calculated from images with at least 100 cells. Read More

View Article and Full-Text PDF

Treated HIV Infection and Progression of Carotid Atherosclerosis in Rural Uganda: A Prospective Observational Cohort Study.

J Am Heart Assoc 2021 Jun 5:e019994. Epub 2021 Jun 5.

Faculty of Medicine Mbarara University of Science and Technology Mbarara Uganda.

Background Although ≈70% of the world's population of people living with HIV reside in sub-Saharan Africa, there are minimal prospective data on the contributions of HIV infection to atherosclerosis in the region. Methods and Results We conducted a prospective observational cohort study of people living with HIV on antiretroviral therapy >40 years of age in rural Uganda, along with population-based comparators not infected with HIV. We collected data on cardiovascular disease risk factors and carotid ultrasound measurements annually. Read More

View Article and Full-Text PDF