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Text of the page (random words):
with a coating of a fluorescent material called the phosphor which absorbs ultraviolet light and re emits visible light fluorescent lighting is more energy efficient than incandescent lighting elements however the uneven spectrum of traditional fluorescent lamps may cause certain colors to appear different from when illuminated by incandescent light or daylight the mercury vapor emission spectrum is dominated by a short wave uv line at 254 nm which provides most of the energy to the phosphors accompanied by visible light emission at 436 nm blue 546 nm green and 579 nm yellow orange these three lines can be observed superimposed on the white continuum using a hand spectroscope for light emitted by the usual white fluorescent tubes these same visible lines accompanied by the emission lines of trivalent europium and trivalent terbium and further accompanied by the emission continuum of divalent europium in the blue region comprise the more discontinuous light emission of the modern trichromatic phosphor systems used in many compact fluorescent lamp and traditional lamps where better color rendition is a goal ref name how fluorescent lamps work cite web last harris first tom title how fluorescent lamps work url http home howstuffworks com fluorescent lamp htm work howstuffworks publisher discovery communications access date 27 june 2010 url status live archive url https web archive org web 20100706040948 http home howstuffworks com fluorescent lamp htm archive date 6 july 2010 date 2001 12 07 ref fluorescent lights were first available to the public at the 1939 new york world s fair improvements since then have largely been better phosphors longer life and more consistent internal discharge and easier to use shapes such as compact fluorescent lamps some high intensity discharge lamp high intensity discharge hid lamps couple their even greater electrical efficiency with phosphor enhancement for better color rendition ref cite book last flesch first p title light and light sources high intensity discharge lamps date 2006 publisher springer verlag isbn 978 3 540 32685 4 location berlin oclc 262693002 ref white light emitting diode s leds became available in the mid 1990s as led lamp s in which blue light emitted from the semiconductor strikes phosphors deposited on the tiny chip the combination of the blue light that continues through the phosphor and the green to red fluorescence from the phosphors produces a net emission of white light ref cite journal last1 chen first1 lei last2 lin first2 chun che last3 yeh first3 chiao wen last4 liu first4 ru shi date 2010 03 22 title light converting inorganic phosphors for white light emitting diodes journal materials volume 3 issue 3 pages 2172 2195 doi 10 3390 ma3032172 issn 1996 1944 pmc 5445896 bibcode 2010mate 3 2172c doi access free ref glow stick s sometimes utilize fluorescent materials to absorb light from the chemiluminescence chemiluminescent reaction and emit light of a different color ref name how fluorescent lamps work analytical chemistry many analytical procedures involve the use of a fluorometer usually with a single exciting wavelength and single detection wavelength because of the sensitivity that the method affords fluorescent molecule concentrations as low as 1 part per trillion can be measured ref cite journal doi 10 1006 abio 1993 1020 title fluorometric assay using dimeric dyes for double and single stranded dna and rna with picogram sensitivity journal analytical biochemistry volume 208 issue 1 pages 144 150 year 1993 last1 rye first1 h s last2 dabora first2 j m last3 quesada first3 m a last4 mathies first4 r a last5 glazer first5 a n pmid 7679561 bibcode 1993anbio 208 144r ref fluorescence in several wavelengths can be detected by an chromatography detector array detector to detect compounds from high performance liquid chromatography hplc flow also thin layer chromatography tlc plates can be visualized if the compounds or a coloring reagent is fluorescent fluorescence is most effective when there is a larger ratio of atoms at lower energy levels in a boltzmann distribution there is then a higher probability of excitement and release of photons by lower energy atoms making analysis more efficient spectroscopy main fluorescence spectroscopy usually the setup of a fluorescence assay involves a light source which may emit many different wavelengths of light in general a single wavelength is required for proper analysis so in order to selectively filter the light it is passed through an excitation monochromator and then that chosen wavelength is passed through the sample cell after absorption and re emission of the energy many wavelengths may emerge due to stokes shift and various electron transition s to separate and analyze them the fluorescent radiation is passed through an emission monochromator and observed selectively by a detector ref cite book author harris daniel c title exploring chemical analysis url https books google com books id x5eew76lizec date 2004 publisher macmillan isbn 978 0 7167 0571 0 url status live archive url https web archive org web 20160731220213 https books google com books id x5eew76lizec archive date 31 july 2016 ref lasers file dye laser alignment intra cavity beam 589nm jpg thumb the internal cavity of a dye laser tuned to 589 nm the green beam from a frequency doubled nd yag laser causes the dye solution to fluoresce in yellow creating a beam between the array of mirrors laser s most often use the fluorescence of certain materials as their active media such as the red glow produced by a ruby laser ruby chromium sapphire the infrared of titanium sapphire laser titanium sapphire or the unlimited range of colors produced by dye laser organic dyes these materials normally fluoresce through a process called spontaneous emission in which the light is emitted in all directions and often at many discrete spectral lines all at once in many lasers the fluorescent medium is laser pumping pumped by exposing it to an intense light source creating a population inversion meaning that more of its atoms become in an excited state high energy rather than at ground state low energy when this occurs the spontaneous fluorescence can then induce the other atoms to emit their photons in the same direction and at the same wavelength creating stimulated emission when a portion of the spontaneous fluorescence is trapped between two mirrors nearly all of the medium s fluorescence can be stimulated to emit along the same line producing a laser beam ref fundamental and details of laser welding by seiji katayama springer 2020 p 3 5 ref biochemistry and medicine main fluorescence in the life sciences file fluorescentcells jpg thumb right endothelium endothelial cells under the microscope with three separate channels marking specific cellular components fluorescence in the life sciences is used generally as a non destructive way of tracking or analysis of biological molecules by means of the fluorescent emission at a specific frequency where there is no background from the excitation light as relatively few cellular components are naturally fluorescent called intrinsic or autofluorescence in fact a protein or other component can be labelled with an extrinsic fluorophore a fluorescent dye that can be a small molecule protein or quantum dot finding a large use in many biological applications ref name lakowicz 1999 rp style ama p mvar xxvi the quantification of a dye is done with a spectrofluorometer and finds additional applications in microscopy when scanning the fluorescence intensity across a plane one has fluorescence microscope fluorescence microscopy of tissues cells or subcellular structures which is accomplished by labeling an antibody with a fluorophore and allowing the antibody to find its target antigen within the sample labelling multiple antibodies with different fluorophores allows visualization of multiple targets within a single image multiple channels dna microarrays are a variant of this immunology an antibody is first prepared by having a fluorescent chemical group attached and the sites e g on a microscopic specimen where the antibody has bound can be seen and even quantified by the fluorescence flim fluorescence lifetime imaging microscopy can be used to detect certain bio molecular interactions that manifest themselves by influencing fluorescence lifetimes cell and molecular biology detection of colocalization using fluorescence labelled antibodies for selective detection of the antigens of interest using specialized software such as imagej other techniques fret förster resonance energy transfer also known as fluorescence resonance energy transfer is used to study protein interactions detect specific nucleic acid sequences and used as biosensors while fluorescence lifetime flim can give an additional layer of information biotechnology biosensors using fluorescence are being studied as possible fluorescent glucose biosensors automated sequencing of dna by the chain termination method each of four different chain terminating bases has its own specific fluorescent tag as the labelled dna molecules are separated the fluorescent label is excited by a uv source and the identity of the base terminating the molecule is identified by the wavelength of the emitted light facs fluorescence activated cell sorting one of several important cell sorting techniques used in the separation of different cell lines especially those isolated from animal tissues dna detection the compound ethidium bromide in aqueous solution has very little fluorescence as it is quenched by water ethidium bromide s fluorescence is greatly enhanced after it binds to dna so this compound is very useful in visualising the location of dna fragments in agarose gel electrophoresis intercalated ethidium is in a hydrophobic environment when it is between the base pairs of the dna protected from quenching by water which is excluded from the local environment of the intercalated ethidium ethidium bromide may be carcinogenic an arguably safer alternative is the dye sybr green figs fluorescence image guided surgery is a medical imaging technique that uses fluorescence to detect properly labeled structures during surgery intravascular fluorescence is a catheter based medical imaging technique that uses fluorescence to detect high risk features of atherosclerosis and unhealed vascular stent devices ref name pmid20210433 cite journal author link3 vasi is ntziachristos vauthors calfon ma vinegoni c ntziachristos v jaffer fa title intravascular near infrared fluorescence molecular imaging of atherosclerosis toward coronary arterial visualization of biologically high risk plaques journal j biomed opt year 2010 volume 15 issue 1 pages 011107 011107 6 pmid 20210433 doi 10 1117 1 3280282 pmc 3188610 bibcode 2010jbo 15a1107c ref plaque autofluorescence has been used in a first in man study in coronary arteries in combination with optical coherence tomography ref name pmid26971006 cite journal vauthors ughi gj wang h gerbaud e gardecki ja fard am hamidi e etal title clinical characterization of coronary atherosclerosis with dual modality oct and near infrared autofluorescence imaging journal jacc cardiovasc imaging year 2016 volume 9 issue 11 pages 1304 1314 pmid 26971006 pmc 5010789 doi 10 1016 j jcmg 2015 11 020 ref molecular agents has been also used to detect specific features such as stent fibrin accumulation and enzymatic activity related to artery inflammation ref name pmid26685129 cite journal vauthors hara t ughi gj mccarthy jr erdem ss mauskapf a lyon sc etal title intravascular fibrin molecular imaging improves the detection of unhealed stents assessed by optical coherence tomography in vivo journal eur heart j year 2015 volume 38 issue 6 pages 447 455 pmid 26685129 pmc 5837565 doi 10 1093 eurheartj ehv677 ref safi species altered fluorescence imaging an imaging technique in electrokinetic phenomena electrokinetics and microfluidics ref cite journal pmid 23463253 url https microfluidics stanford edu publications particletracking_diagnostics shkolnikov_a 20method 20for 20non invasive 20full field 20imaging 20and 20quantification 20of 20chemical 20species pdf year 2013 last1 shkolnikov first1 v title a method for non invasive full field imaging and quantification of chemical species journal lab on a chip volume 13 issue 8 pages 1632 43 last2 santiago first2 j g doi 10 1039 c3lc41293h url status live archive url https web archive org web 20160305034642 https microfluidics stanford edu publications particletracking_diagnostics shkolnikov_a 20method 20for 20non invasive 20full field 20imaging 20and 20quantification 20of 20chemical 20species pdf archive date 5 march 2016 ref it uses non electromigrating dyes whose fluorescence is easily quenched by migrating chemical species of interest the dye s are usually seeded everywhere in the flow and differential quenching of their fluorescence by analytes is directly observed fluorescence based assays for screening toxicity toxic chemicals the optical assays consist of a mixture of environment sensitive fluorescent dyes and human skin cells that generate fluorescence spectra patterns ref name moczko2016 cite journal pmid 27653274 pmc 5031998 year 2016 last1 moczko first1 e title fluorescence based assay as a new screening tool for toxic chemicals journal scientific reports volume 6 article number 33922 last2 mirkes first2 em last3 cáceres first3 c last4 gorban first4 an last5 piletsky first5 s doi 10 1038 srep33922 doi access free bibcode 2016natsr 633922m ref this approach can reduce the need for animal testing laboratory animals in biomedical research and pharmaceutical industry bone margin detection alizarin alizarin stained specimens and certain fossils can be lit by fluorescent lights to view anatomical structures including bone margins ref cite journal last1 smith first1 w leo last2 buck first2 chesney a last3 ornay first3 gregory s last4 davis first4 matthew p last5 martin first5 rene p last6 gibson first6 sarah z last7 girard first7 matthew g date 2018 08 20 title improving vertebrate skeleton images fluorescence and the non permanent mounting of cleared and stained specimens journal copeia language en us volume 106 issue 3 pages 427 435 doi 10 1643 cg 18 047 issn 0045 8511 doi access free ref forensics fingerprint s can be visualized with fluorescent compounds such as ninhydrin or dfo 1 8 diazafluoren 9 one blood and other substances are sometimes detected by fluorescent reagents like fluorescein fiber s and other materials that may be encountered in forensic science forensics or with a relationship to various collectible s are sometimes fluorescent non destructive testing fluorescent penetrant inspection is used to find cracks and other defects on the surface of a part dye tracing using fluorescent dyes is used to find leaks in liquid and gas plumbing systems signage file new fluorescent school zone sign jpg thumb a road sign with the wor...