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Definition
| the distance between successive peaks or troughs |
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Definition
| the number of cycles per unit of time |
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Definition
| the organized flow of energy through space, in the form of elcetromagnetic waves |
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| electromagnetic radiation |
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Definition
| energy in the form of transverse magnetic and electric waves |
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Definition
| the duration of an organism's daily exposure to light, considered especiallywith regard to the effect of exposure on growth and development |
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Definition
the quatum of elctromagnetic energy, regard as a discrete particle having zero mass, no electric charge, and an infinitely long lifetime.
(one unit of light) |
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Definition
| a stacked membrane with in a chloroplast that contains the chlorophyll and is the site of the light reactions of photosythesis |
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Definition
| the connective tissue framework of an organ or other structure, as distinguished from the tissues performing the special function of the organ or part |
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Term
photosynthetically active radiation
(PAR) |
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Definition
| the part of the radiant energy spectrum effective in photosythesis |
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Definition
| a device for measuring the radiant flux(power) of elctromegnetic radiation |
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Definition
| an instrument for measuring light intensity or optical properties of solutions or surfaces |
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Definition
| the amount of illumination shed by a standard candle and intercepted on one sq. ft. of surface with a curvature radius of twleve inches. |
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Definition
| radiant flux intercepted per unit area |
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Definition
| the growth response of a plant to the length of day |
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Definition
| changing in respone to light |
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Definition
plants that initiate flowers only in day lengths exceeding 12 hrs.
(mostly summer bloomers) |
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Term
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Definition
| plants that can initiate flowers during any day length |
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Definition
plants that can initiate flowers only when the day length is below 12 hrs.
(mostly fall and spring bloomers) |
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Term
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Definition
| direction of growth in which the direction is detrimined by the direction of the light source |
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Term
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Definition
| the asymmetrical distribution of hormones in plants that are stimulated by light |
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Definition
| a pigment system in the leaf that specifically receives the photoperiodic message |
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Term
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Definition
| emit light from a tungstem filament to extremely high temperatures |
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Definition
a light sensitive cell or organ that conveys impulses through the sensory neuron connected to it
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Term
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Definition
| a plant hormone that promotes flowering |
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Definition
| a series of reactions, occuring during photosynthesis, in which glucose is synthesized for CO2 |
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Term
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Definition
| oxidation of carbohydrates in plants with release of CO2 during photosynthesis |
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Definition
| the plastid of a dark-grown plant that contains crystalline prolamellar bodies |
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Term
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Definition
| are tetraterperiod organic pigments that are naturally occuring in the chloroplasts and chromoplasts of some plants and other photosynthetic organisms |
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Definition
| part of a molecule responsible for its color |
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Definition
| a photo receptor, a pigment that plants use to detect light |
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Definition
| the ratio of the total upper leaf surface of vegetation divided by the suface area of the land ond which the vegetation grows. |
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Definition
| is the SI derived unit of luminous flux, a measure of power of light perceived by the human eye. |
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Definition
| power emitted by a light source in aparticular direction, a physical process that will produce one candela of luminous intensity |
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Definition
| the # of photons in a light beam reaching a surface, such as the surface of the photocathode of a photomultiplier tube in a unit of time |
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Definition
| measure the spectral power distributions of illuminants |
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Definition
| is a radiometry term for the power per unit area of magnetic radiation at a surface |
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Definition
| the amount of heat that is required to raise the temperature of one gram of water from 14.50c to 15.50c. |
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Definition
| unit of force, which, when acting on something with a mass of 1g., produces an accerationof one cm per second (1cm-s-2) |
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Definition
| a unit equivalent to one mole of light quanta (photons) |
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Definition
| a unit of work or energy that is accoplished by a force of one dyne moving through a distance of 1 cm. 1erg=1dyne*cm-1 |
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Definition
| the flow of a substance or the tranfer of energy across a surface |
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Definition
a unit of work or energy that is done by a force of one newton moving through of 1m
1 joule =10,000ergs=1 newton |
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Definition
| one langley eguals 1 calorie per sq. cm, which is equivalent to .484 watts*m-2 |
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Definition
| the molecule weight of a substance expressed in grams(gram molecule weight) |
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Definition
a unit of work or force, which when acting on something with a mass of one km., produces an accerationof one meter per second
1 newton=1km*m*s=100,000 dynes |
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Term
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Definition
| unit adopted by the System Internaternatinal d'Unites |
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Term
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Definition
| a unit of power (work done unit time) that is equal to one Joule per second |
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