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The density of air or atmospheric density is the mass per unit volume of Earth's atmosphere.

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An air quality index (AQI) is an approximation of how polluted the air currently is or how polluted it is forecast to become.

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There is no unit for this parameter. In german it is LQI (Luftqualitätsindex).

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The carrier-to-noise ratio is defined as the ratio of the received modulated carrier signal power C to the received noise power N

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Phycocyanin is a pigment-protein complex from the light-harvesting phycobiliprotein family, along with allophycocyanin and phycoerythrin. It is an accessory pigment to chlorophyll. All phycobiliproteins are water-soluble, so they cannot exist within the membrane like carotenoids can. Instead, phycobiliproteins aggregate to form clusters that adhere to the membrane called phycobilisomes. Phycocyanin is a characteristic light blue color, absorbing orange and red light, particularly 620 nm (depending on which specific type it is), and emits fluorescence at about 650 nm (also depending on which type it is).

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Phycoerythrin (PE) is a red protein-pigment complex from the light-harvesting phycobiliprotein family, present in cyanobacteria, red algae and cryptophytes, accessory to the main chlorophyll pigments responsible for photosynthesis.The red pigment is due to the prosthetic group, phycoerythrobilin, which gives phycoerythrin its red color.

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Concentration volatile organic compound (VOC)

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Volatile organic compounds (VOCs) are
carbon-based chemicals with high vapor pressure at room temperature, allowing them to easily evaporate into the air from solids or liquids.

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Not found in typical vocabularies. TVOC ist the total amount - but better use in label. Units are ppb, ppm and µg/m³.

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In navigation, the course of a watercraft or aircraft is the cardinal direction in which the craft is to be steered.

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The (mass) concentration ρi is defined as the mass of a constituent mi divided by the volume of the mixture V. In this case it means the mass concentration of dsDNA molecules in a solution measured in nanogram dsDNA per microliter sample volume.

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Particle size is a notion introduced for comparing dimensions of solid particles (flecks), liquid particles (droplets), or gaseous particles (bubbles). The notion of particle size applies to particles in colloids, in ecology, in granular material (whether airborne or not), and to particles that form a granular material (see also grain size).

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The (square) waves of electrical signals that occur in such a short period of time and have a certain width.

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Pulse rate is more used for hearth-rates so this term is not applicable. "Pulse signal" or "Pulse count" hits it also. Other characteristics are "Pulse duration" or "Pulse intervall". Unit is a number #

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Phycocyanin is a pigment-protein complex from the light-harvesting phycobiliprotein family, along with allophycocyanin and phycoerythrin. It is an accessory pigment to chlorophyll, found in cyanobacteria (also called blue-green algae). Because all phycobiliproteins are water-soluble, they cannot exist within the phospholipid cell membranes like carotenoids can. Instead, phycobiliproteins aggregate to form clusters that adhere to the membrane, called phycobilisomes.

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Skin temperature is the temperature of the outermost surface of the body.

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Body skin temperature is also fine because sink temperature is sometimes also used like "Oberflächentemperaturen von Oberflächen im Gelände"

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In hydrology, stemflow is the flow of intercepted water down the trunk or stem of a plant.