Microscopy, Electron, Scanning
Drug Delivery Systems
Microscopy, Electron, Transmission
Nebulizers and Vaporizers
Air Pollutants, Occupational
Calorimetry, Differential Scanning
Signal Recognition Particle
Metered Dose Inhalers
Centrifugation, Density Gradient
Respiratory Protective Devices
Vaccines, Virus-Like Particle
Spectroscopy, Fourier Transform Infrared
Chromatography, Supercritical Fluid
Hyperlipidemia, Familial Combined
Electrophoresis, Polyacrylamide Gel
Inclusion Bodies, Viral
Molecular Sequence Data
Chromatography, High Pressure Liquid
Green Chemistry Technology
Glomerular size-selective dysfunction in NIDDM is not ameliorated by ACE inhibition or by calcium channel blockade. (1/6488)BACKGROUND: In patients with insulin-dependent diabetes mellitus (IDDM) and overt nephropathy glomerular barrier size-selectivity progressively deteriorates with time and is effectively improved by angiotensin converting enzyme (ACE) inhibition. Whether similar glomerular functional changes develop in proteinuric patients with non-insulin-dependent diabetes mellitus (NIDDM), and whether antihypertensive agents can favorably affect glomerular filtration of macromolecules in these patients, has not been documented yet. METHODS: We investigated renal hemodynamics and fractional clearance of neutral dextrans of graded sizes, in nine proteinuric patients with NIDDM and renal biopsy findings of typical diabetic glomerulopathy. Six healthy volunteers served as controls. We also investigated the effects of an ACE inhibitor and of a calcium channel blocker, both given in doses targeted to achieve a comparable level of systemic blood pressure control, on glomerular hemodynamics and sieving function. Theoretical analysis of glomerular macromolecule transport was adopted to evaluate intrinsic glomerular membrane permeability properties. RESULTS: Fractional clearance of large macromolecules (42 to 66 A in radius) was significantly higher in diabetic patients than in controls, and the distribution of membrane pore radii was calculated to be shifted towards larger pore sizes in diabetics (mean radius increased from 55 to 60 A). Despite effective blood pressure control, neither antihypertensive affected glomerular hemodynamics to any significant extent. Fractional clearance of dextrans, as well as of albumin and IgG, and total urinary proteins were not modified by either treatments. CONCLUSIONS: These data indicate that patients with NIDDM and overt nephropathy develop abnormalities in size-selective function of the glomerular barrier and, at variance to IDDM, such changes were not ameliorated either by ACE inhibition or calcium channel blockade. (+info)
Dynamics of plaque formation in Alzheimer's disease. (2/6488)Plaques that form in the brains of Alzheimer patients are made of deposits of the amyloid-beta peptide. We analyze the time evolution of amyloid-beta deposition in immunostained brain slices from transgenic mice. We find that amyloid-beta deposits appear in clusters whose characteristic size increases from 14 microm in 8-month-old mice to 22 microm in 12-month-old mice. We show that the clustering has implications for the biological growth of amyloid-beta by presenting a growth model that accounts for the experimentally observed structure of individual deposits and predicts the formation of clusters of deposits and their time evolution. (+info)
Cryoelectron microscopy of a nucleating model bile in vitreous ice: formation of primordial vesicles. (3/6488)Because gallstones form so frequently in human bile, pathophysiologically relevant supersaturated model biles are commonly employed to study cholesterol crystal formation. We used cryo-transmission electron microscopy, complemented by polarizing light microscopy, to investigate early stages of cholesterol nucleation in model bile. In the system studied, the proposed microscopic sequence involves the evolution of small unilamellar to multilamellar vesicles to lamellar liquid crystals and finally to cholesterol crystals. Small aliquots of a concentrated (total lipid concentration = 29.2 g/dl) model bile containing 8.5% cholesterol, 22.9% egg yolk lecithin, and 68.6% taurocholate (all mole %) were vitrified at 2 min to 20 days after fourfold dilution to induce supersaturation. Mixed micelles together with a category of vesicles denoted primordial, small unilamellar vesicles of two distinct morphologies (sphere/ellipsoid and cylinder/arachoid), large unilamellar vesicles, multilamellar vesicles, and cholesterol monohydrate crystals were imaged. No evidence of aggregation/fusion of small unilamellar vesicles to form multilamellar vesicles was detected. Low numbers of multilamellar vesicles were present, some of which were sufficiently large to be identified as liquid crystals by polarizing light microscopy. Dimensions, surface areas, and volumes of spherical/ellipsoidal and cylindrical/arachoidal vesicles were quantified. Early stages in the separation of vesicles from micelles, referred to as primordial vesicles, were imaged 23-31 min after dilution. Observed structures such as enlarged micelles in primordial vesicle interiors, segments of bilayer, and faceted edges at primordial vesicle peripheries are probably early stages of small unilamellar vesicle assembly. A decrease in the mean surface area of spherical/ellipsoidal vesicles was correlated with the increased production of cholesterol crystals at 10-20 days after supersaturation by dilution, supporting the role of small unilamellar vesicles as key players in cholesterol nucleation and as cholesterol donors to crystals. This is the first visualization of an intermediate structure that has been temporally linked to the development of small unilamellar vesicles in the separation of vesicles from micelles in a model bile and suggests a time-resolved system for further investigation. (+info)
Sodium ion uptake into isolated plasma membrane vesicles: indirect effects of other ions. (4/6488)Vesicles derived from plasma membrane of corneal endothelium were agitated to their minimum size distribution. When isotonic salt solutions surrounding the vesicles were changed there were alterations to the vesicle size distribution: the modal point of the logarithmic distribution did not change but the log variance did, indicating that substantial fission and fusion of vesicles occurred depending upon the nature of the surrounding solute. Orientation and total membrane area was conserved in the transformed population of vesicles. Although the ions added to the external isotonic salt solutions in the present series of experiments have no direct effect upon sodium membrane transporters in these membranes, kinetics of sodium accumulation into the vesicles were affected in a way that correlated with changes to the vesicle size distribution. Early-saturating (<1 min) intravesicular concentrations of sodium corresponded with apparently stable populations. Late-saturating (>1 min) intravesicular concentrations of sodium corresponded with significant vesicle distribution shifts and included a few seconds of delay. During the linear accumulation phase, both populations showed similar magnitudes of sodium transport. The significance of these data is discussed. (+info)
Morphological behavior of acidic and neutral liposomes induced by basic amphiphilic alpha-helical peptides with systematically varied hydrophobic-hydrophilic balance. (5/6488)Lipid-peptide interaction has been investigated using cationic amphiphilic alpha-helical peptides and systematically varying their hydrophobic-hydrophilic balance (HHB). The influence of the peptides on neutral and acidic liposomes was examined by 1) Trp fluorescence quenched by brominated phospholipid, 2) membrane-clearing ability, 3) size determination of liposomes by dynamic light scattering, 4) morphological observation by electron microscopy, and 5) ability to form planar lipid bilayers from channels. The peptides examined consist of hydrophobic Leu and hydrophilic Lys residues with ratios 13:5, 11:7, 9:9, 7:11, and 5:13 (abbreviated as Hels 13-5, 11-7, 9-9, 7-11, and 5-13, respectively; Kiyota, T., S. Lee, and G. Sugihara. 1996. Biochemistry. 35:13196-13204). The most hydrophobic peptide (Hel 13-5) induced a twisted ribbon-like fibril structure for egg PC liposomes. In a 3/1 (egg PC/egg PG) lipid mixture, Hel 13-5 addition caused fusion of the liposomes. Hel 13-5 formed ion channels in neutral lipid bilayer (egg PE/egg PC = 7/3) at low peptide concentrations, but not in an acidic bilayer (egg PE/brain PS = 7/3). The peptides with hydrophobicity less than Hel 13-5 (Hels 11-7 and Hel 9-9) were able to partially immerse their hydrophobic part of the amphiphilic helix in lipid bilayers and fragment liposome to small bicelles or micelles, and then the bicelles aggregated to form a larger assembly. Peptides Hel 11-7 and Hel 9-9 each formed strong ion channels. Peptides (Hel 7-11 and Hel 5-13) with a more hydrophilic HHB interacted with an acidic lipid bilayer by charge interaction, in which the former immerses the hydrophobic part in lipid bilayer, and the latter did not immerse, and formed large assemblies by aggregation of original liposomes. The present study clearly showed that hydrophobic-hydrophilic balance of a peptide is a crucial factor in understanding lipid-peptide interactions. (+info)
Concatemerization of tRNA molecules in the presence of trivaline derivative. (6/6488)The interaction of tRNA with trivaline dansyl hydrazide trifluoroacetate (DHTV) has been studied. The shape of curves of fluorimetric titration of tRNA with DHTV and vice versa can be explained only by formation of DHTV dimers on tRNA molecules, and subsequent association of DHTV-saturated tRNA molecules with each other. The ability of tRNA molecules to form concatemers in solution in the presence of DHTV has been demonstrated by electron microscopy. Electron microscopy of the tRNA-DHTV complexes stained with uranyl acetate revealed flexible rods 6-7 nm thick and up to several micrometers long. (+info)
Hexavalent chromium responsible for lung lesions induced by intratracheal instillation of chromium fumes in rats. (7/6488)Lung toxicity of chromium fumes (Cr fumes) was examined by a single intratracheal instillation into rats of 10.6 mg and 21.3 mg Cr fumes/kg body weight and by repeated (3 times) instillations of 10.8 mg and 21.7 mg Cr fumes/kg. The pathological changes were compared with those induced by single administrations of 3.2 mg and 19.2 mg Na2CO3 solution-insoluble fraction of Cr fumes (Cr-Fr)/kg and 20.8 mg commercially available chromium (III) oxide powder (Cr (III) oxide)/kg. Single and repeated administrations of Cr fumes suppressed growth rate in a dose-dependent manner, but administrations of Cr-Fr and Cr (III) oxide did not. A single administration of Cr fumes produced granulomas in the entire airways and alveoli with progressive fibrotic changes, as well as severe mobilization and destruction of macrophages and foamy cells. Those histopathological changes were aggravated by the repeated administration of Cr fumes. On the other hand, single administrations of Cr-Fr and Cr (III) oxide produced no remarkable histopathological changes. Cr fumes were found to be composed of 73.5% chromium (III) oxide and 26.5% chromium (VI) oxide. The primary particles of Cr fumes and Cr-Fr were similar, 0.02 micron in size (sigma g: 1.25), and Cr (III) oxide particles were 0.30 micron in size (sigma g: 1.53), measured by analytical electron microscopy (ATEM). Diffuse clusters of the primary particles in Cr fumes were identified as Cr (VI) oxide. The present results suggested that the lung toxicity of Cr fumes was mainly caused by these Cr (VI) oxide (CrO3) particles in Cr fumes. (+info)
A new model rat with acute bronchiolitis and its application to research on the toxicology of inhaled particulate matter. (8/6488)The aim of the present study was to establish a useful animal model that simulates humans sensitive to inhaled particulate matter (PM). We have developed a new rat model of acute bronchiolitis (Br) by exposing animals to NiCl2 (Ni) aerosols for five days. Three days following the Ni exposure, the animals developed signs of tachypnea, mucous hypersecretion, and bronchiolar inflammation which seemed to progress quickly during the fourth to fifth day. They recovered from lesions after four weeks in clean air. To assess the sensitivity of the Br rats to inhaled particles, two kinds of PM of respirable size were tested with doses similar to or a little higher to the recommended threshold limit values (TLVs) for the working environment in Japan. Titanium dioxide (TiO2 = Ti) was chosen as an inert and insoluble particles and vanadium pentoxide (V2O5 = V), as a representative soluble and toxic airborne material. The Br rats exposed to either Ti or V were compared the pathological changes in the lungs and the clearance of particles to those in normal control or Br rats kept in clean air. The following significant differences were observed in Br rats: 1. delayed recovery from pre-existing lesions or exacerbated inflammation, 2. reductions in deposition and clearance rate of inhaled particles with the progress of lesions. The present results suggest that Br rats are more susceptible to inhaled particles than control rats. Therefore, concentrations of particulate matter lower than the TLVs for Japan, which have no harmful effects on normal lungs, may not always be safe in the case of pre-existing lung inflammation. (+info)
The condition is caused by mutations in genes that code for proteins involved in lipid metabolism, such as the low-density lipoprotein receptor gene (LDLR), apolipoprotein A-1 gene (APOA1), and proprotein convertase subtilisin/kexin type 9 (PCSK9) genes. These mutations can lead to the overproduction or underexpression of certain lipids, leading to the characteristic lipid abnormalities seen in HeFH.
HeFH is usually inherited in an autosomal dominant manner, meaning that a single copy of the mutated gene is enough to cause the condition. However, some cases may be caused by recessive inheritance or de novo mutations. The condition can affect both children and adults, and it is important for individuals with HeFH to be monitored closely by a healthcare provider to manage their lipid levels and reduce the risk of cardiovascular disease.
Treatment for HeFH typically involves a combination of dietary modifications, such as reducing saturated fat intake and increasing fiber and omega-3 fatty acid intake, and medications, such as statins, to lower cholesterol levels. In some cases, apheresis or liver transplantation may be necessary to reduce lipid levels. Early detection and management of HeFH can help prevent or delay the development of cardiovascular disease, which is the leading cause of death worldwide.
There are several types of hyperlipidemia, including:
1. High cholesterol: This is the most common type of hyperlipidemia and is characterized by elevated levels of low-density lipoprotein (LDL) cholesterol, also known as "bad" cholesterol.
2. High triglycerides: This type of hyperlipidemia is characterized by elevated levels of triglycerides in the blood. Triglycerides are a type of fat found in the blood that is used for energy.
3. Low high-density lipoprotein (HDL) cholesterol: HDL cholesterol is known as "good" cholesterol because it helps remove excess cholesterol from the bloodstream and transport it to the liver for excretion. Low levels of HDL cholesterol can contribute to hyperlipidemia.
Symptoms of hyperlipidemia may include xanthomas (fatty deposits on the skin), corneal arcus (a cloudy ring around the iris of the eye), and tendon xanthomas (tender lumps under the skin). However, many people with hyperlipidemia have no symptoms at all.
Hyperlipidemia can be diagnosed through a series of blood tests that measure the levels of different types of cholesterol and triglycerides in the blood. Treatment for hyperlipidemia typically involves dietary changes, such as reducing intake of saturated fats and cholesterol, and increasing physical activity. Medications such as statins, fibric acid derivatives, and bile acid sequestrants may also be prescribed to lower cholesterol levels.
In severe cases of hyperlipidemia, atherosclerosis (hardening of the arteries) can occur, which can lead to cardiovascular disease, including heart attacks and strokes. Therefore, it is important to diagnose and treat hyperlipidemia early on to prevent these complications.
There are several causes of hypertriglyceridemia, including:
* Genetics: Some people may inherit a tendency to have high triglyceride levels due to genetic mutations that affect the genes involved in triglyceride metabolism.
* Obesity: Excess body weight is associated with higher triglyceride levels, as there is more fat available for energy.
* Diabetes: Both type 1 and type 2 diabetes can lead to high triglyceride levels due to insulin resistance and altered glucose metabolism.
* High-carbohydrate diet: Consuming high amounts of carbohydrates, particularly refined or simple carbohydrates, can cause a spike in blood triglycerides.
* Alcohol consumption: Drinking too much alcohol can increase triglyceride levels in the blood.
* Certain medications: Some drugs, such as anabolic steroids and some antidepressants, can raise triglyceride levels.
* Underlying medical conditions: Certain medical conditions, such as hypothyroidism, kidney disease, and polycystic ovary syndrome (PCOS), can also contribute to high triglyceride levels.
Hypertriglyceridemia is typically diagnosed with a blood test that measures the level of triglycerides in the blood. Treatment options for hypertriglyceridemia depend on the underlying cause of the condition, but may include lifestyle modifications such as weight loss, dietary changes, and medications to lower triglyceride levels.
Particle size analysis
Particle size (disambiguation)
Particle collection in wet scrubbers
Tethered particle motion
Condensation particle counter
Light scattering by particles
Stable nucleic acid lipid particle
Fritz Karl Preikschat
Brownian motion of sol particles
The Variation of Animals and Plants Under Domestication
Dispersive flies optimisation
Warm-hot intergalactic medium
List of Ghostbusters characters
Formation evaluation neutron porosity
False vacuum decay
Pioneer Venus Multiprobe
Health and safety hazards of 3D printing
Gaseous detection device
Amount of substance
Docket 174: Coal Dust Particle Size Surveys | NIOSH | CDC
261e) On-Line Particle Size Distribution Analyser | AIChE
Compost Particle Size
Particle Size Analysis for Homogenization Process Development
Effects of particle size and moisture levels in mixed rations on the feeding behavior of dairy heifers | animal | Cambridge Core
Particle Size Control, Sinterability and Piezoelectric Properties of BaTiO3 Prepared by a Novel Composite-Hydroxide-Mediated...
What is the expected addressable market value of global particle size analysis market over a 5-year period?
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Nanobacteria (Nano-sized calcifying particles)
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Evaluate the depth of two composites' cure with different filler particles sizes
Registration Dossier - ECHA
John Deere Forage harvester 9800 - dlg.org
Shimadzu Webshop. Particle size: 3 µm; length: 75 mm, ID: 3.0 mm
Measuring Particle Size Distribution of Calcium Carbonate Powders with Laser Diffraction Method
Registration Dossier - ECHA
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Coal dust particle size survey2
- Given the results of the recent coal dust particle size survey and large-scale explosion tests, NIOSH recommends a new standard of 80% total incombustible content be required in the intake airways of bituminous coal mines. (cdc.gov)
- The results are presented of a recent coal dust particle size survey to determine the range of coal particles sizes found in dust samples collected from intake airways from 47 coal mines in MSHA's ten bituminous coal mine health and safety districts (see figure 1). (bb-ikejime.be)
- Giorgia De Matteis works as application specialist for particle characterization and surface charge at Anton Paar GmbH. (anton-paar.com)
- 1. INTRODUCTION TO PARTICLE SIZE CHARACTERIZATION Knowledge of particle sizes and the size distribution of a powder system is a prerequisite for most production and processing operations. (casaconrado.es)
- Recently it was speculated that ultrafine particles may translocate from deposition sites in the lungs to systemic circulation. (cdc.gov)
- In additional studies, the biokinetics of ultrafine particles and soluble 192Ir was studied after administra- tion by either gavage or intratracheal instillation or intravenous injection. (cdc.gov)
Recent coal dust particle size1
- This report gives the results of recent coal dust particle size surveys and large-scale explosion tests and how this data impacts rock dusting requirements for underground coal mines. (cdc.gov)
Product particle size distrib1
- There is a common need to determine the amount of material in …CONE CRUSHER MODELLING AND SIMULATION process and calculate a product particle size distribution Crushers are usually a part of a ... grinding mill to produce less than 10 micron particle size. (casaconrado.es)
Knowledge of particle size1
- The quest for a knowledge of particle size has led to the development of a large number of particle sizing techniques. (aiche.org)
- so deagglomeration process are necessary for getting particles of narrow particle size distribution. (casaconrado.es)
- 40 burnability …High precision and reproducible data from Horiba LA-950 particle size analyzer provide the critical information for evaluating different equipment and processing conditions. (casaconrado.es)
- The pharmaceutical industry, in particular, uses emulsions and suspensions to increase drug efficacy by controlling their particle size and size distribution. (horiba.com)
- This webinar discusses ways to develop a robust homogenization process for making pharmaceutical emulsions by evaluating droplet size distribution. (horiba.com)
- Both Y and Z types interaction chambers from Microfluidics produce emulsions with fine size and fairly uniform distribution. (casaconrado.es)
- ISO 22412:2017 specifies the application of dynamic light scattering (DLS) to the measurement of average hydrodynamic particle size and the measurement of the size distribution of mainly submicrometre-sized particles, emulsions or fine bubbles dispersed in liquids. (iso.org)
- This paper describes the design and development of a spring particle size analyser, which overcomes most of the problems associated with the above conventional techniques. (aiche.org)
- The weight of the powder discharged is measured and particle size distribution (PSD) is then provided as a plot of percentage mass of discharged powder versus the corresponding particle size. (aiche.org)
- Hence size distribution of the particles is the most important parameters to be understood. (atlas.jp)
- The present study is intended to quantify the net effects of turbulence on the particle size distribution in the mixing layer. (atlas.jp)
- A ball mill bauxite received from the mines is crushed to a particle size of less than 25 mm cost andParticle size distribution jaw crusher. (casaconrado.es)
- particle size distribution jaw crusher. (casaconrado.es)
- Custom Particle Size Distribution for Manufacturing. (casaconrado.es)
- Y type is slightly more efficient than Z type.particle size distribution in cement mill. (casaconrado.es)
- Particle Sizes Distribution Models. (casaconrado.es)
- Hindalco manufactures ground hydrate with different particle size (5-15 micron) distribution. (casaconrado.es)
- Surface-treated fine hydrate …Cement milling particle size distribution. (casaconrado.es)
- particle size reduction ultra fine grindingltra-fine grinding particle size reduction services 050 microns the process engineers at fluid energy recognize that no one jet mill is suitable for all learn morearticle size grinding millarticle size distribution mills bayer - …Particle Size Distribution Mills Bayer. (casaconrado.es)
- Particle size distribution and particle sizerelated. (bb-ikejime.be)
- Particle size distribution and particle sizerelated crystalline silica content in granite quarry dust Sirianni G1 Hosgood HD 3rd Slade MD Borak J Author information 1Department of Occupational Safety and Health Management University of New Haven West Haven Connecticut USA. (bb-ikejime.be)
- Particle Size Distribution of Settled Dust In 1958, San Bernardino County Air Pollution Control District adopted rules and regulations for the control of dust, fumes and particulate matter. (bb-ikejime.be)
- Particle size distribution of dust at emission (dust PSD) is an essential quantity to estimate in dust studies. (bb-ikejime.be)
- What Is a Particle Size Distribution Curve? (wstyler.com)
- This is where a reliable particle size distribution curve comes into play. (wstyler.com)
- But what exactly does a particle size distribution curve entail. (wstyler.com)
- How Would You Define a Particle Size Distribution Curve? (wstyler.com)
- Particle size distribution is the process in which a sample of material that is typically taken from a production line is examined to identify the average size of the individual particles. (wstyler.com)
- The particle size distribution curve is a graph that is generated to illustrate the average particle size, the smallest particle size, and the largest particle size. (wstyler.com)
- A good sample should, in general, follow the same particle size distribution curve every time you run it. (wstyler.com)
- How Do I Generate a Particle Size Distribution Curve? (wstyler.com)
- This is what gives you the peak that is synonyms with a proper particle size distribution curve. (wstyler.com)
- Thinking back to math class, a distribution curve is really the mean, mode, and average of your particle sizes. (wstyler.com)
- What Common Mistakes Are Made When Generating a Particle Size Distribution Curve? (wstyler.com)
- The common mistakes that are seen when lab operators generate a particle size distribution curve ultimately come down to two factors: inconsistency and human error. (wstyler.com)
- Additional user requirements include particle size distribution and bulk density. (who.int)
- The size distribution for thelecithin/clinoptilolite complex was determined with a dynamic light scattering technique. (who.int)
- Particle analysis, whether is test sieve analysis, air jet sieve analysis, or dynamic image analysis, is an essential aspect of a wide range of quality control programs across dozens of industries. (wstyler.com)
- When conducting a particle size analysis, particularly test sieve analysis, you have a set stack of test sieves, some falling on the coarse end of the spectrum and some falling on the fine. (wstyler.com)
Microns in size3
- Particles of any solid substance, generally under 30 microns in size, often noted as PM30. (bvsalud.org)
- There was a time when I would have had to explain to you what an N95 mask is, how it is designed to filter out 95% of fine particles, defined as stuff in the air less than 2.5 microns in size. (medscape.com)
- But, as the poet said, all that is less than 2.5 microns in size is not coronavirus. (medscape.com)
- The mean particle diameter decreased from 500 to 50 nm with a decrease in the (BaCl 2 + TiO 2 )/(NaOH + KOH) molar ratio from 0.44 to 0.04. (scirp.org)
- Particles of 10 microns diameter and less. (bb-ikejime.be)
- Ultrafine 192Ir radio-labeled iridium particles (15 and 80 nm count median diameter) generated by spark discharging were inhaled by young adult, healthy, male WKY rats ventilated for 1 h via an endotracheal tube. (cdc.gov)
- A hazardous particulate size less than 5 microns. (bb-ikejime.be)
- What is the particle size of the 'DUSSMASS - Dust Surface Mass Concentration' variable from MERRA-2 Reanalyses? (nasa.gov)
- Is it the dust surface mass concentration at the particle size of PM10? (nasa.gov)
- The N95 had its moment - a moment that seemed to be passing as the concentration of airborne coronavirus particles decreased. (medscape.com)
- Des échantillons de sang ont été prélevés pendant les 24 heures suivant l'administration de la dose et la concentration en aténolol a été évaluée par chromatographie en phase liquide à haute performance. (who.int)
- The formulations were characterized according to size, polydispersity index, pH, encapsulation rate and in vitro release. (bvsalud.org)
- The size of aerosol particles often reveals their source or type. (bb-ikejime.be)
- 2019).Thus turbulence has two opposite effects on the particle size, but net effects have been unquantified. (atlas.jp)
- It is known that atmospheric CO 2 absorbed in the particles and various materials stuck to particles' surfaces are advected and transported to the deep layers in the ocean. (atlas.jp)
- The National Institute for Occupational Safety and Health (NIOSH) and MSHA conducted a joint survey to determine the range of coal particle sizes found in dust samples collected from intake and return airways of U.S. coal mines. (cdc.gov)
- You can refer to the FAQs at https://gmao.gsfc.nasa.gov/reanalysis/MERRA-2/FAQ/ for the specific size of each dust bin. (nasa.gov)
- Luckily, the lungs have another function they have defense mechanisms that protects them by removing dust particles from the respiratory system. (bb-ikejime.be)
- particle size survey to determine the range of coal particle sizes found in dust samples collected from intake airways in 50 US coal mines in MSHA s 10 bituminous Coal Mine Safety and Health Districts (seeFig. (bb-ikejime.be)
- Particles such as sea salt and desert dust tend to be larger than aerosols that come from burning-including forest fires and the burning of fossil fuels for energy. (bb-ikejime.be)
- At high concentrations, particle-particle interactions and multiple light scattering can become dominant and can result in apparent particle sizes that differ between concentrated and dilute suspensions. (iso.org)
- Volume and surface area of the sinking particle as well as its sinking velocity are key parameters for the transport, and all these parameters depend on particle size. (atlas.jp)
- Although compost heaps are made of much larger particles than soil, the relationship between particle size and surface area is the same. (wilderness-survival.net)
- Allen (1997) cites over 50 methods for particle size analysis based on a variety of principles with different degrees of sophistication. (aiche.org)
- The end result of any particle analysis process is an accurate look into the individual particles that make up your production line. (wstyler.com)
- W.S. Tyler has been a leader of the particle size analysis industry for over 140 years and leverages these yeats of experience to guide lab operators towards a process that is successful, reliable, and efficient. (wstyler.com)
- To make this process easy, it is recommended that a 100g sample is used to conduct a particle size analysis when possible. (wstyler.com)
- This document describes methods for the measurement of particle size distributions for cellulose nanocrystals using atomic force microscopy and transmission electron microscopy. (iso.org)
- Efficacy is not compromised by contaminants or particles in the water. (cdc.gov)
- Two experiments on replacement heifers (175±12 days of age) assessed the effects of forage particle length and moisture on feeding behavior. (cambridge.org)
- From each bulk bag unloader, particles are micronized in a vortex mill (at floor level), pneumatically conveyed into the product collector, and screened in the centrifugal sifter below it. (process-worldwide.com)
- In waste management, the first step is often coarse shredding, using the particle size to set up the shredder machine. (techrxiv.org)
- Turbulent flow was first simulated until the turbulence became statistically steady, and then packets of 10-12 µm in size (radius) were continuously deployed at the surface. (atlas.jp)
- 1% of the deposited particles into secondary organs such as liver, spleen, heart, and brain was measured after systemic uptake from the lungs. (cdc.gov)
- Approximately 30% of the chemicals produced in the world are in the form of powder and nearly all aspects of the technology related to their manufacture, handling or application at some stage require a knowledge of the particle size. (aiche.org)
- It works on the basis of the fact that when the spring is stretched and agitated, the particle size of the powder discharged from the spring coils is equal to the spring's openings. (aiche.org)
- In Experiment 1, dry matter intake (DMI) and eating rate (DMI/min) tended to increase, whereas daily eating time decreased as the feed particle size decreased. (cambridge.org)
- This could lead to accumulation and potentially adverse reactions in critical organs such as liver, heart, and even brain, consistent with the hypothesis that ultrafine insoluble particles may play a role in the onset of cardiovas- cular diseases, as growing evidence from epidemiological studies suggests. (cdc.gov)
- This cleared fraction includes particles deposited in the alveolar region. (cdc.gov)
- heifers fed the Short diet selected against long particles and in favor of short and fine particles. (cambridge.org)
- abstract = "The exponential downstream decline in particle size predicted by Sternberg (1875) is examined within a highly active alpine fluvial environment, the gravel‐bed Squamish River in southwestern British Columbia. (edu.au)
- Some larger single-cell creatures can surround or envelop and then "swallow" tiny food particles. (wilderness-survival.net)
- 2008). On the other hand, recent studies show that strong turbulence breaks larger particles and limits their sizes to about Kolmogorov's scale (Takeuchi et al. (atlas.jp)
- These effects were larger than the size-limiting effects due to turbulence. (atlas.jp)