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When exposed to ultraviolet light, natural ergosterols in mushrooms produce vitamin D < sub > 2 </ sub >, a process now exploited for the functional food retail market.
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When and exposed
When the first meeting of the Fourth Duma was convened in late 1912, only one out of six Bolshevik deputies, Matvei Muranov, ( another one, Roman Malinovsky, was later exposed as an Okhrana secret police agent ) voted to break away from the Menshevik faction within the Duma on 15 December 1912.
When the endocervix is exposed to the harsh acidic environment of the vagina it undergoes metaplasia to squamous epithelium which is better suited to the vaginal environment.
When exposed to sunlight, artificial light, or infrared radiation ( even the heat of a hand nearby can be enough ), the vanes turn with no apparent motive power, the dark sides retreating from the radiation source and the light sides advancing.
When these crystals are exposed to radiation, the dysprosium atoms become excited and luminescent.
When exposed to the ultraviolet rays of sunlight, many explosive compounds containing nitrogen groups rapidly decompose, affecting their stability.
When the Balts withstood outside threats, they exposed an irresolute Kremlin.
When the cannon was fired through the touchhole, turbulence from the initial surface combustion caused the rest of the powder to be rapidly exposed to the flame.
When exposed to the atmosphere, zinc reacts with oxygen to form zinc oxide, which further reacts with water molecules in the air to form zinc hydroxide.
When Cicero, who was consul that year, exposed Catiline's conspiracy to seize control of the republic, several senators accused Caesar of involvement in the plot.
When exposed to a magnetic field, the domain boundaries move so that the domains aligned with the magnetic field grow and dominate the structure as shown at the left.
When the dendritic cells are chronically exposed to morphine during their differentiation process then treated with LPS, the production of cytokines is different.
When exposed to antibiotics, most bacteria die quickly, but some may have mutations that make them slightly less susceptible.
When Operation Deadlight was activated, it was found that many of the U-boats were in an extremely poor condition as a result of being moored in exposed harbours while awaiting disposal.
When exposed to nitrogen clean titanium metal is covered with a titanium nitride layer.
When isolated, it resembles tin, but discolors when exposed to air.
During the temporary absence of the two men, she meets Cecily, each woman indignantly declaring that she is the one engaged to “ Ernest .” When Jack and Algernon reappear, their deceptions are exposed.
When a designer, engineer, or user decides to use a valve for an application, he / she should ensure the rated maximum temperature and pressure are never exceeded and that the wetted materials are compatible with the fluid the valve interior is exposed to.
When a crystal is mounted and exposed to an intense beam of X-rays, it scatters the X-rays into a pattern of spots or reflections that can be observed on a screen behind the crystal.
When UF < sub > 6 </ sub > is exposed to water vapor in the air, it reacts with the moisture to produce UO < sub > 2 </ sub > F < sub > 2 </ sub > ( uranyl fluoride ), a solid, and HF ( hydrogen fluoride ), a gas, both of which are highly soluble and toxic.
When these methods were used, a number of false stigmatics were exposed.
When the exposed surface reaches a temperature of about 30, 000 K, there are enough ultraviolet photons being emitted to ionize the ejected atmosphere, making it glow.
When that mixture has dried, the metal stylus is used on the plate and thereby removes some of the grit particles, so that minuscule areas of copper are exposed to the acid and etched ; they will eventually hold the ink for the printing process.
When filming on location around the world, Quinn was exposed to regional contemporary art styles exhibited at local galleries and studied art history in each area.
When the plug bevel contact is released, the two regions are exposed to each other.
When and ultraviolet
When describing graviton interactions, the classical theory ( i. e., the tree diagrams ) and semiclassical corrections ( one-loop diagrams ) behave normally, but Feynman diagrams with two ( or more ) loops lead to ultraviolet divergences ; that is, infinite results that cannot be removed because the quantized general relativity is not renormalizable, unlike quantum electrodynamics.
When a star has lost enough material, its temperature increases and the ultraviolet radiation it emits can ionize the surrounding nebula that it has thrown off.
When ultraviolet radiation is not absorbed by the atmosphere or other protective coating, it can cause damage to the skin known as sunburn or trigger an adaptive change in human skin pigmentation.
When ultraviolet rays penetrate the skin and damage DNA, thymidine dinucleotide ( pTpT ) fragments from damaged DNA will trigger melanogenesis and cause the melanocyte to produce melanosomes, which are then transferred by dendrite to the top layer of keratinocytes.
When these are used on fluorescent paper, the inked areas fluoresce less than the surrounding paper area when under an ultraviolet lamp.
When the skin is exposed to ultraviolet light after lime juice contact, a reaction known as phytophotodermatitis can occur, which can cause darkening of the skin, swelling or blistering.
When selecting for mates, ultraviolet plumage and skin coloration show a high level of selection.
When treated against ultraviolet light, these tarpaulins can last for years exposed to the elements, but non-UV treated material will quickly become brittle and lose strength and water resistance if exposed to sunlight.
When used in this context, the traditional terms " infrared " and " ultraviolet " are not literal references to specific regions of the spectrum.
When the body appears white, it is emitting a substantial fraction of its energy as ultraviolet radiation.
When a mercury vapor lamp is first turned on, it will produce a dark blue glow because only a small amount of the mercury is ionized and the gas pressure in the arc tube is very low, so much of the light is produced in the ultraviolet mercury bands.
" When the titanium dioxide absorbs ultraviolet light, it becomes powerfully reactive, breaking down pollutants that come in contact with the concrete.
When in contact with the skin, the Key lime can sometimes cause phytophotodermatitis, in which a chemical reaction makes the skin extra sensitive to ultraviolet light.
When the electron falls back to its original state, it emits a photon, resulting in visible light or ultraviolet radiation depending on the fill materials.
When held against the sun it will appear like ordinary amber, and under ultraviolet light it will glow a bright milky-blue.
When the beads are not exposed to ultraviolet rays, they are colourless and either translucent or opaque.
When and light
When the light went their way, they went on across the street.
When he was inducted into the Army at Fort Knox, Ky., Hansen's weight had dropped to 180 -- `` too light for me to be at my best '' he said.
When quoted unqualified, it usually refers to some appropriate average across the spectrum of visible light.
When the light from a heated material was passed through a prism, it produced a multi-colored spectrum.
When she made it, the results, starring Margaret Rutherford, were popular and successful light comedies, but were disappointing to Christie herself ; nevertheless, Agatha Christie dedicated the novel The Mirror Crack'd from Side to Side to Rutherford.
When the telescope is at position E it must be oriented toward spot S ′ so that the star light enters the telescope at spot S ′.
When the particles are in great motion, they produce a Doppler shift for measuring wind speed in the laser light, which is used to calculate the speed of the particles, and therefore the air around the anemometer.
When the wind blows horizontally, it presses on and moves the ball ; because ping-pong balls are very lightweight, they move easily in light winds.
When Congress overrode his veto, the project had its green light and ground was first broken in 1991.
When light is sent through the sample, it is backscattered by the particles / droplets.
When the radiometer is heated in the absence of a light source, it turns in the forward direction ( i. e. black sides trailing ).
When looking at a cross section of a beam of light, the length over which the phase is correlated is called the transverse coherence length.
When open, doors admit people, animals, ventilation, and light.
) When Thomas Young first demonstrated this phenomenon, it indicated that light consists of waves, as the distribution of brightness can be explained by the alternately additive and subtractive interference of wavefronts.
When writing solo passages for the bass in orchestral or chamber music, composers typically ensure the orchestration is light so it doesn't obscure the bass.
When an electron in an excited molecule or atom descends to a lower energy level, it emits a photon of light equal to the energy difference.
When Loki, god of mischief and strife, murdered Baldr, god of beauty and light, he was punished by being bound in a cave with a poisonous serpent placed above his head dripping venom.
When light is sent through the sample, it is backscattered by the droplets.
When the frequency of the strobe equals the frequency of the rotating or vibrating object, the object completes one cycle of oscillation and returns to its original position between the flashes of light, so when illuminated by the strobe the object appears stationary.
When moving from a denser medium into a less dense one ( i. e., n < sub > 1 </ sub > > n < sub > 2 </ sub >), above an incidence angle known as the critical angle, all light is reflected and R < sub > s </ sub > = R < sub > p </ sub > = 1.
When light makes multiple reflections between two or more parallel surfaces, the multiple beams of light generally interfere with one another, resulting in net transmission and reflection amplitudes that depend on the light's wavelength.
When this material condenses in the rain, it forms dust and light sandy materials that resembles ground pumice.
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