• particles
  • A major source of Fe to the open ocean is Aeolian dust deposition in which Fe is largely comprised of particles with reduced bioavailability over soluble forms of Fe. (soton.ac.uk)
  • We report that Trichodesmium erythraeum IMS101 has improved growth rate and photosynthetic physiology and down-regulates Fe-stress biomarker genes when cells are grown in the direct vicinity of, rather than physically separated from, Saharan dust particles as the sole source of Fe. (soton.ac.uk)
  • Dust mites produce 10-20 waste particles per day. (sciencephoto.com)
  • The early work involved measuring dust exposure by counting the number of particles collected from the air by sampling devices. (wikipedia.org)
  • A pressureless perfect fluid can be interpreted as a model of a configuration of dust particles that locally move in concert and interact with each other only gravitationally, from which the name is derived. (wikipedia.org)
  • For this reason, dust models are often employed in cosmology as models of a toy universe, in which the dust particles are considered as highly idealized models of galaxies, clusters, or superclusters. (wikipedia.org)
  • Larger systems utilize a two-stage system, which separates larger particles from fine dust using a pre-collection device, such as a cyclone or baffled canister, before drawing the air through the impeller. (wikipedia.org)
  • Most cosmic dust particles are between a few molecules to 0.1 µm in size. (wikipedia.org)
  • In August 2014, scientists announced the collection of possible interstellar dust particles from the Stardust spacecraft since returning to Earth in 2006. (wikipedia.org)
  • In March 2017, scientists reported that extraterrestrial dust particles have been identified all over planet Earth. (wikipedia.org)
  • When infrared astronomy began, the dust particles were observed to be significant and vital components of astrophysical processes. (wikipedia.org)
  • Cosmic dust can be detected by indirect methods that utilize the radiative properties of the cosmic dust particles. (wikipedia.org)
  • NASA collects samples of star dust particles in the Earth's atmosphere using plate collectors under the wings of stratospheric-flying airplanes. (wikipedia.org)
  • Don Brownlee at the University of Washington in Seattle first reliably identified the extraterrestrial nature of collected dust particles in the latter 1970s. (wikipedia.org)
  • toxicity
  • The health and safety hazards of nanomaterials include the potential toxicity of various types of nanomaterials, as well as fire and dust explosion hazards. (wikipedia.org)
  • For nanomaterials, toxicity hazards are the most important, but dust explosion hazards may also be relevant. (wikipedia.org)
  • By developing and validating mathematical models of accumulated lung dust burden and resulting inflammation, IOM research has shown that the toxicity of several insoluble dusts of different compositions can be predicted from their surface area. (wikipedia.org)
  • exposure
  • According to the new NIST/EPA study, house dust and the home environment are likely candidates for other sources of exposure. (bio-medicine.org)
  • Skin contact and ingestion exposure, and dust explosion hazards, are also a concern. (wikipedia.org)
  • These ambitious and clear objectives were remarkably far-sighted, implying a requirement to measure both exposure to airborne dust and health outcomes in a large cohort of miners over a prolonged period, and to use these quantitative data to set protective health standards in the industry. (wikipedia.org)
  • A substantial advance was achieved with the measurement of exposure by weighing the dust collected by MRE 113a respirable dust samplers, which were invented specifically for the research by Henry Walton and Robert Hamilton. (wikipedia.org)
  • In 1985, an important association between risk of pathological emphysema and dust exposure was demonstrated, leading ultimately to recognition of this disease as a quantifiable risk of coal mining. (wikipedia.org)
  • Recent analysis of the mortality of a subset of the miners originally studied has found an association between the risk of lung cancer and quartz exposure, and raised mortality from chronic lung disease and pneumoconiosis associated with increasing dust exposure. (wikipedia.org)
  • Coal workers' pneumoconiosis (CWP), also known as black lung disease or black lung, is caused by long exposure to coal dust. (wikipedia.org)
  • Prolonged exposure to large amounts of coal dust can result in more serious forms of the disease, simple coal workers' pneumoconiosis and complicated coal workers' pneumoconiosis (or progressive massive fibrosis, or PMF). (wikipedia.org)
  • More commonly, workers exposed to coal dust develop industrial bronchitis, clinically defined as chronic bronchitis (i.e. productive cough for 3 months per year for at least 2 years) associated with workplace dust exposure. (wikipedia.org)
  • Continued exposure to coal dust following the development of simple CWP may progress to complicated CWP with progressive massive fibrosis (PMF), wherein large masses of dense fibrosis develop, usually in the upper lung zones, measuring greater than 1 cm in diameter, with accompanying decreased lung function. (wikipedia.org)
  • There are three basic criteria for the diagnosis of CWP: Chest radiography consistent with CWP An exposure history to coal dust (typically underground coal mining) of sufficient amount and latency Exclusion of alternative diagnoses (mimics of CWP) Symptoms and pulmonary function testing relate to the degree of respiratory impairment but are not part of the diagnostic criteria. (wikipedia.org)
  • Repeated exposure to wood dust can cause chronic bronchitis, emphysema, "flu-like" symptoms, and cancer. (wikipedia.org)
  • cosmic dust
  • Cosmic dust, also called extraterrestrial dust or space dust, is dust which exists in outer space, as well as all over planet Earth. (wikipedia.org)
  • Cosmic dust can be further distinguished by its astronomical location: intergalactic dust, interstellar dust, interplanetary dust (such as in the zodiacal cloud) and circumplanetary dust (such as in a planetary ring). (wikipedia.org)
  • By one estimate, as much as 40,000 tons of cosmic dust reaches the Earth's surface every year. (wikipedia.org)
  • In October 2011, scientists reported that cosmic dust contains complex organic matter (amorphous organic solids with a mixed aromatic-aliphatic structure) that could be created naturally, and rapidly, by stars. (wikipedia.org)
  • Cosmic dust was once solely an annoyance to astronomers, as it obscures objects they wish to observe. (wikipedia.org)
  • For example, cosmic dust can drive the mass loss when a star is nearing the end of its life, play a part in the early stages of star formation, and form planets. (wikipedia.org)
  • Cosmic dust can also be detected directly ('in-situ') using a variety of collection methods and from a variety of collection locations. (wikipedia.org)
  • deposition
  • The modified BCR three-step sequential extraction procedure has been applied to homogenized urban dust samples and to simulated air filters loaded with the prepared urban dust via the wet deposition procedure. (springer.com)
  • surfaces
  • Without housecleaning lime scale can build up on taps, mold grows in wet areas, smudges on glass surfaces, dust forms on surfaces, bacterial action make the garbage disposal and toilet smell and cobwebs accumulate. (wikipedia.org)
  • Over time dust accumulates on household surfaces. (wikipedia.org)
  • As well as making the surfaces dirty, when dust is disturbed it can become suspended in the air, causing sneezing and breathing trouble. (wikipedia.org)
  • The best way to clear most surfaces of the dust is with cold water (and, if necessary, a household detergent). (wikipedia.org)
  • The study of dust is a largely researched topic that brings together different scientific fields: physics (solid-state, electromagnetic theory, surface physics, statistical physics, thermal physics), fractal mathematics, chemistry (chemical reactions on grain surfaces), meteoritics, as well as every branch of astronomy and astrophysics. (wikipedia.org)
  • 2000
  • The top image shows a martian north polar dust storm observed on 29 August 2000. (nasa.gov)
  • The bottom image shows a terrestrial dust storm, seen in a SeaWiFS image , acquired on 26 February 2000. (nasa.gov)
  • Red Dust is a 2000 novel written by South African-born Gillian Slovo that is structured around the hearings of the Truth and Reconciliation Commission (TRC) in the fictional town Smitsrivier and also addresses the question of truth. (wikipedia.org)
  • airborne
  • The research underpinned the recommendations for more stringent airborne dust standards in British coalmines and the PFR was ultimately used as the basis for many national dust standards around the world. (wikipedia.org)
  • Dust collection systems are often part of a larger air quality management program that also includes large airborne particle filtration units mounted to the ceiling of shop spaces and mask systems to be worn by workers. (wikipedia.org)
  • Wood dust also frequently contains chemicals and fungi, which can become airborne and lodge deeply in the lungs, causing illness and damage. (wikipedia.org)
  • accumulate
  • The astronomers accumulate observational 'snapshots' of dust at different stages of its life and, over time, form a more complete movie of the Universe's complicated recycling steps. (wikipedia.org)
  • Vacuum
  • Feather and lamb's wool dusters, cotton and polyester dust cloths, furniture spray, disposable paper "dust cloths", dust mops for smooth floors and vacuum cleaners. (wikipedia.org)
  • further explanation needed] The Neugebauer-Meinel dust models a rotating disk of dust matched to an axisymmetric vacuum exterior. (wikipedia.org)
  • Smaller dust collection systems use a single-stage vacuum unit to create suction and perform air filtration, where the waste material is drawn into an impeller and deposited into a container such as a bag, barrel, or canister. (wikipedia.org)
  • carbon
  • With his focus on radioactive supernova gas Clayton discovered a new chemical pathway causing carbon dust to condense there by a process that is activated by the radioactivity. (wikipedia.org)
  • processes
  • This afterglow carries information about the conditions in the early universe which can help us understand the origin of the structures that we see today, and the processes that were important in this era. (blogspot.com)
  • The evolution of dust traces out paths in which the Universe recycles material, in processes analogous to the daily recycling steps with which many people are familiar: production, storage, processing, collection, consumption, and discarding. (wikipedia.org)
  • include
  • Special cases include FLRW and Kasner dust. (wikipedia.org)
  • Noteworthy individual dust solutions include: Lemaître-Tolman-Bondi (LTB) dusts (some of the simplest inhomogeneous cosmological models, often employed as models of gravitational collapse) Kantowski-Sachs dusts (cosmological models which exhibit perturbations from FLRW models) Gödel metric Lorentz group Schutz, Bernard F. (2009), "4. (wikipedia.org)
  • involves
  • The effect involves taking a container and filling it with toner dust (a toner printer cartridge gives similar effect) and launching it at a hard surface (the target) with considerable force. (wikipedia.org)
  • consistent
  • This is done via a ducting system, properly sized and manifolded to maintain a consistent minimum air velocity required to keep the dust in suspension for conveyance to the collection device. (wikipedia.org)
  • sources
  • Research has shown that the erosion of diatomaceous earth in such areas (such as the Bodélé Depression in the Sahara) is one of the most important sources of climate-affecting dust in the atmosphere. (wikipedia.org)
  • role
  • Dust storms play an important role in governing the climate of Mars. (nasa.gov)
  • Hands-on learning, a form of active and experiential learning, predates language and the ability to convey knowledge by means other than demonstration, and has been shown to be one of the more effective means of learning and over the past two decades has been given an increasingly important role in education. (wikipedia.org)
  • In the Solar System, dust plays a major role in the zodiacal light, Saturn's B Ring spokes, the outer diffuse planetary rings at Jupiter, Saturn, Uranus and Neptune, and comets. (wikipedia.org)
  • forms
  • These findings suggest that availability of non-soluble forms of dust-associated Fe may depend on cell contact. (soton.ac.uk)
  • Sahara
  • More than 56% of the dust fertilizing the Amazon rainforest comes from the Bodélé depression in Northern Chad in the Sahara desert. (wikipedia.org)
  • The yearly Sahara dust replaces the equivalent amount of phosphorus washed away yearly in Amazon soil from rains and floods. (wikipedia.org)
  • surface
  • Various household cleaning products have been developed to facilitate the removal of dust and dirt, for surface maintenance, and for disinfection. (wikipedia.org)
  • Dust samples are also collected from surface deposits on the large Earth ice-masses (Antarctica and Greenland/the Arctic) and in deep-sea sediments. (wikipedia.org)
  • pressure
  • In general relativity, a dust solution is a fluid solution, a type of exact solution of the Einstein field equation, in which the gravitational field is produced entirely by the mass, momentum, and stress density of a perfect fluid that has positive mass density but vanishing pressure. (wikipedia.org)
  • samples
  • Statistically evaluated results indicate significant differences between the extracted portions of analytes in urban dust and simulated air filters, where the mobility of some analytes in simulated air filters was higher than that in urban dust samples. (springer.com)
  • development
  • Ruth Fuller Sasaki (October 31, 1892 - October 24, 1967), born Ruth Fuller, was an important figure in the development of Buddhism in the United States. (wikipedia.org)
  • Wood
  • Occupational Safety & Health Administration (OSHA) on 'Wood Dust'[permanent dead link] - (U.S.) Center for Disease Control's National Institute for Health and Safety (CDC-NIOSH) - (U.S.) Rod Cole article, "Grounding PVC and Other Dust Collection Myths - (U.S. (wikipedia.org)
  • Wetter wood cuts easily with a continuous ribbon of shavings that are relatively dust-free. (wikipedia.org)
  • provides
  • In use, it provides a system for both epidemiological comparisons of many individuals exposed to dust and evaluation of an individual's potential disease relative to established standards. (wikipedia.org)
  • prevent
  • In industry, round or rectangular ducts are used to prevent buildup of dust in processing equipment. (wikipedia.org)
  • Earth
  • In this figure, we compare a recent dust storm on Mars with one that occurred earlier this year on Earth. (nasa.gov)
  • On Earth, dust storms are also being recognized as contibuting to environmental change, potentially influencing seasonal meteorology and the health of biological communities . (nasa.gov)
  • The dust density falling to Earth is approximately 10−6/m3 with each grain having a mass between 10−16kg (0.1 pg) and 10−4 kg (100 mg). (wikipedia.org)
  • The terminology has no specific application for describing materials found on the planet Earth except for dust that has demonstrably fallen to Earth. (wikipedia.org)
  • further
  • further explanation needed] A Kasner dusts is the simplest[according to whom? (wikipedia.org)
  • further explanation needed] Friedmann-Lemaître-Robertson-Walker (FLRW) dusts are homogeneous[clarification needed] and isotropic[clarification needed]. (wikipedia.org)
  • origin
  • Press, 2003), describing in prose the nuclear origin of each isotope of our natural elements and important evidence supporting each nuclear origin. (wikipedia.org)
  • This is accomplished with devices such as capture hoods to catch dust at its source of origin. (wikipedia.org)