spectrum /spec·trum/ (spek´trum) pl. spec´tra [L.]
spectrum
spectrum [spek´trum] (L.)
Patient discussion about spectrum.
1. a charted band of wavelengths of electromagnetic radiation obtained by refraction or diffraction.
2. by extension, a measurable range of activity, as the range of bacteria affected by an antibiotic (antibacterial s.) or the complete range of manifestations of a disease.
absorption spectrum that afforded by light which has passed through various gaseous media, each gas absorbing those rays of which its own spectrum is composed.
broad-spectrum effective against a wide range of microorganisms; said of an antibiotic.
electromagnetic spectrum the range of electromagnetic energy from cosmic rays to electric waves, including gamma, x- and ultraviolet rays, visible light, infrared waves, and radio waves.
fortification spectrum a form of migraine aura characterized by scintillating or zigzag bands of colored light forming the edge of an area of teichopsia.
visible spectrum that portion of the range of wavelengths of electromagnetic vibrations (from 770 to 390 nm) which is capable of stimulating specialized sense organs and is perceptible as light.
spec·trum (sp k tr m)n. pl. spec·trums or spec·tra (-tr ) 1. The distribution of a characteristic of a physical system or phenomenon, especially the distribution of energy emitted by a radiant source arranged in order of wavelengths. 2. The color image presented when white light is resolved into its constituent colors: red, orange, yellow, green, blue, indigo, violet. 3. The plot of intensity as opposed to wavelength of light emitted or absorbed by a substance, usually characteristic of the substance and used in qualitative and quantitative analysis. 4. The distribution of atomic or subatomic particles in a system, as in a magnetically resolved molecular beam, arranged in order of masses. 5. The group of pathogenic organisms against which an antibiotic or other antibacterial agent is effective. |
spectrum
1 a range of phenomena or properties occurring in increasing or decreasing magnitude. Radiant or electromagnetic energy is arranged on the basis of wavelength and frequency. Electromagnetic radiation includes spectra of radio waves, infrared waves, visible light, ultraviolet waves, x-rays, and gamma rays. See also electromagnetic radiation, wave.
2 the range of effectiveness of an antibiotic. A broad-spectrum antibiotic is effective against a wide range of microorganisms. See also antibiotic.
spectrum [spek´trum] (L.)
1. the series of images resulting from the refraction of electromagnetic radiation (e.g., light, x-rays) and their arrangement according to frequency or wavelength.
2. range of activity, as of an antibiotic, or of manifestations, as of a disease. adj., adj spec´tral.
absorption spectrum one obtained by passing radiation with a continuous spectrum through a selectively absorbing medium.
broad-spectrum effective against a wide range of microorganisms.
visible spectrum that portion of the range of wavelengths of electromagnetic vibrations (from 770 to 390 nanometers) which is capable of stimulating specialized sense organs and is perceptible as light.
spectrum
pl. spectra, spectrums [L.]
1. the series of images resulting from the refraction of electromagnetic radiation (e.g. light, x-rays) and their arrangement according to frequency or wavelength.
2. range of activity, as of an antibiotic, or of manifestations, as of a disease.
absorption spectrum
one obtained by passing radiation with a continuous spectrum through a selectively absorbing medium.
antibacterial spectrum
the range of bacteria susceptible to a particular antimicrobial or class of antimicrobials.
broad-spectrum
effective against a wide range of microorganisms.
visible spectrum
that portion of the range of wavelengths of electromagnetic vibrations (from 770 to 390 nanometers) which is capable of stimulating specialized sense organs and is perceptible as light.
spectrum
1. Spatial display of a complex radiation produced by separation of its monochromatic components.
2. Composition of a complex radiation, e.g. continuous spectrum, line spectrum (CIE). Plural: spectra. See light.
absorption spectrum The curve representing the relative absorption of a pigment or chemical substance as a function of the wavelength of light. Example: the absorption spectrum of rhodopsin. Syn. absorbance spectrum.
action spectrum A graphical representation of the relative energy necessary to produce a constant biological effect. Example: frequency of action potentials in a ganglion cell as a function of wavelength.
continuous spectrum A spectrum in which, over a considerable range, all wavelengths exist without any abrupt variation in intensity. Example: the spectrum of hot solids. See filament lamp.
electromagnetic spectrum The total range of all electromagnetic waves. It extends from the longest radio waves of some thousands of metres in wavelength through radar, microwave, infrared rays, visible rays (between wavelengths 780nm and 380nm) to ultraviolet rays, X-rays, gamma rays and cosmic rays with wavelengths as short as 8 ✕ 10−12mm. All these electromagnetic waves differ only in frequency (and wavelength) but have the same speed as light in a vacuum.
equal energy spectrum Spectrum in which all wavelengths have about the same amount of energy. See achromatic; white light.
fortification spectrum See scintillating scotoma.
invisible spectrum The portions of the entire electromagnetic spectrum that are made up of radiations other than those of the visible spectrum.
line spectrum Spectrum consisting of a series of discrete monochromatic lines (or narrow bands of monochromatic light) with large intensity differences and separated by intervals without radiations. Example: the spectrum emitted by an electric discharge through a gas or vapour under low pressure.
spectrum locus The representation of the spectral colour stimuli on a chromaticity diagram.
solar spectrum The spectrum formed by sunlight. It is crossed at intervals by Fraunhofer's lines.
visible spectrum The portion of the electromagnetic spectrum that can be perceived by the visual system. It is composed of radiations of wavelengths in the range between 380nm and 780nm in younger eyes. This range decreases with age especially due to lens absorption of short wavelengths becoming closer to 420nm than 380nm. See light.
absorption spectrum The curve representing the relative absorption of a pigment or chemical substance as a function of the wavelength of light. Example: the absorption spectrum of rhodopsin. Syn. absorbance spectrum.
action spectrum A graphical representation of the relative energy necessary to produce a constant biological effect. Example: frequency of action potentials in a ganglion cell as a function of wavelength.
continuous spectrum A spectrum in which, over a considerable range, all wavelengths exist without any abrupt variation in intensity. Example: the spectrum of hot solids. See filament lamp.
electromagnetic spectrum The total range of all electromagnetic waves. It extends from the longest radio waves of some thousands of metres in wavelength through radar, microwave, infrared rays, visible rays (between wavelengths 780nm and 380nm) to ultraviolet rays, X-rays, gamma rays and cosmic rays with wavelengths as short as 8 ✕ 10−12mm. All these electromagnetic waves differ only in frequency (and wavelength) but have the same speed as light in a vacuum.
equal energy spectrum Spectrum in which all wavelengths have about the same amount of energy. See achromatic; white light.
fortification spectrum See scintillating scotoma.
invisible spectrum The portions of the entire electromagnetic spectrum that are made up of radiations other than those of the visible spectrum.
line spectrum Spectrum consisting of a series of discrete monochromatic lines (or narrow bands of monochromatic light) with large intensity differences and separated by intervals without radiations. Example: the spectrum emitted by an electric discharge through a gas or vapour under low pressure.
spectrum locus The representation of the spectral colour stimuli on a chromaticity diagram.
solar spectrum The spectrum formed by sunlight. It is crossed at intervals by Fraunhofer's lines.
visible spectrum The portion of the electromagnetic spectrum that can be perceived by the visual system. It is composed of radiations of wavelengths in the range between 380nm and 780nm in younger eyes. This range decreases with age especially due to lens absorption of short wavelengths becoming closer to 420nm than 380nm. See light.
| Table S4 Approximate values of the velocity, frequency and wavelength of electromagnetic radiations in a vacuum (the values represent a point within a range of radiations) | ||||||||
| wavelength | ||||||||
| radiation | velocity (m/s) | frequency (Hz) | (m) | (nm) | ||||
| AM radio | 3 ✕ 108 | 1 ✕ 106 | 3 ✕ 102 | 3 ✕ 1011 | ||||
| television | 3 ✕ 108 | 1 ✕ 108 | 3 | 3 ✕ 109 | ||||
| radar | 3 ✕ 108 | 1 ✕ 109 | 3 ✕ 10−1 | 3 ✕ 108 | ||||
| microwave | 3 ✕ 108 | 1 ✕ 1010 | 3 ✕ 10−2 | 3 ✕ 107 | ||||
| thermal infrared | 3 ✕ 108 | 1 ✕ 1013 | 3 ✕ 10−5 | 3 ✕ 104 | ||||
| near infrared | 3 ✕ 108 | 1 ✕ 1014 | 3 ✕ 10−6 | 3000 | ||||
| light | ||||||||
| red | 3 ✕ 108 | 3.94 ✕ 1014 | 7.6 ✕ 10−7 | 760 | ||||
| yellow | 3 ✕ 108 | 5.45 ✕ 1014 | 5.5 ✕ 10−7 | 550 | ||||
| violet | 3 ✕ 108 | 7.50 ✕ 1014 | 4.0 ✕ 10−7 | 400 | ||||
| ultraviolet | 3 ✕ 108 | 1 ✕ 1016 | 3 ✕ 10−8 | 30 | ||||
| X-rays | 3 ✕ 108 | 1 ✕ 1018 | 3 ✕ 10−10 | 0.3 | ||||
| gamma rays | 3 ✕ 108 | 1 ✕ 1021 | 3 ✕ 10−13 | 0.0003 | ||||
Patient discussion about spectrum.
Q. What is the difference between autism, and autism spectrum? Doctor states my child is autistic, school says he has autism spectrum disorder. What is the difference? Can medication help with any of this?
A. i agree with Lilian- it's just a way for schools to keep their behinds clean...
Q. What shall I do with my 3 years old son with autism spectrum disorder. What shall I do with my 3 years old son with autism spectrum disorder to increase on his Sensory Integration. I feel therapy is too costly to afford….Is there any alternative.
A. there are some computer software that can do that too, and it doesn't cost all that much.they combine hearing- seeing and feeling.
i saw a computer USB contraption that also work int hat method and i think it costs 150-200 $ ...not sure....
i saw a computer USB contraption that also work int hat method and i think it costs 150-200 $ ...not sure....
Q. What is a "spectrum disorder" mean? I just heard/read about spectrum disorder, What is a "spectrum disorder" mean?
A. Autism is a spectrum disorder where symptoms and characteristics can present themselves in a wide variety of combinations, from mild to severe and in any combination. A high functioning individual with autism might simply seem eccentric, a loner. More severely affected individuals may hardly communicate and prefer to function primarily in "their own world". Most individuals fall in the middle of the spectrum.
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