phototaxis biology definition
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Phototaxis Phototaxis. the motor reaction of motile microorganisms in response to the stimulus of light; a form of taxis. The reaction of zoospores to light, and the slow shift of chloroplasts within a cell in response to light, are also called phototaxis.
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Photosynthesis Photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds. The location, importance, and mechanisms of photosynthesis.
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- Photosynthesis is a process used by plants and other organisms to convert light energy, normally from the Sun, into chemical energy that can be later released to fuel the organisms' activities.owever, not all organisms that use light as a source of energy carry out photosynthesis, since photoheterotrophs use organic compounds, rather than carbon dioxide, as a source of carbon. In plants, algae and cyanobacteria, photosynthesis releases oxygen. This is called oxygenic photosynthesis.
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- Photodynamic therapy (PDT) is a treatment that uses a light-sensitive drug and a laser or light source to destroy cancer cells. The light-sensitive drug is sometimes called the photosensitising agent. It is a drug that makes cells more sensitive to light. This is called photosensitivity.
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Are all carnivorous plants photoheterotrophic? Photoautotrophs: Bacteria that use sunlight as their energy source and carbon dioxide (as part of photosynthesis) as their carbon source. These bacteria thus obtain all their … nourishment through photosynthesis Photoheterotrophs: Bacteria that use sunlight as their energy source and organic compounds from the environment as their carbon source.
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- photoheterotroph. Definitions: 1. An organism that depends on light for most of its energy and principally on organic compounds for its carbon. The definition information for photoheterotroph is provided by Stedman's. You can search our medical dictionary here.. An organism that depends on light for most of its energy and principally on organic compounds for its carbon. The definition information for photoheterotroph is provided by Stedman's.
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- A phototroph is an organism that carries out photosynthesis to make energy. They are typically plants.Phototrophs are also known as photoautotrophs. phototroph is an organism that carries out photosynthesis to acquire energy.
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Phytotoxin Phytotoxin is an umbrella term that refers to substances that are inhibitory to the growth of or poisonous to plants. Phytotoxic substances may result from human activity, as with herbicides, or they may be produced by plants, by microorganisms, or by naturally occurring chemical reactions. A good soil will protect plants from toxic concentrations of such substances by ventilating gases, decomposing or absorbing organic toxins, or suppressing toxin-producing organisms. The term is also sometimes
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- Phototaxis is an organism's movement in response to light. An example of phototaxis is a bug crawling toward the sunlight. ModL: see photo-and amp; -taxis. the positive, or negative, response of a freely moving organism toward, or away from, light. Origin of phototaxis. noun.
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BASIC BIOLUMINESCENCE Bioluminescence is defined as the emission of light from a living organism that functions for its survival or propagation. It is a cold light, resulting from a specific biochemical mechanism involving chemical processes, often specific for that organism.
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Definitions &Translations Biological magnification often refers to the process whereby certain substances such as pesticides or heavy metals move up the food chain, work their way into rivers or lakes, and are eaten by aquatic organisms such as fish, which in turn are eaten by large birds, animals or humans.
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- WhAt is photoDynAMic therApy (pDt)? Photodynamic therapy is an outpatient procedure involving the use of a special light-activated drug. The inactive form of the drug is usually injected into a vein in the arm, where it travels to and accumulates in abnormal blood vessels under the center of the macula.
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- A photoheterotroph is an organism which depends on light for the majority of its energy and that mainly depends on organic compounds for its carbon.3 people found this useful.plit and merge into it. Answer by Gatorgirl93. Confidence votes 166. A photoheterotroph is an organism that uses light as an energy source and obtains its carbon source from organic compounds.
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- Definition. Photosynthesis: the process in which green plants use energy from the sun to transform water, carbon dioxide, and minerals into oxygen and organic compounds. Photosynthesis means: putting together the light: photo (light) + synthesis (put together).
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Phototroph Phototrophs (Gr: φῶς, φωτός = light, τροϕή = nourishment) are the organisms that carry out photon capture to acquire energy. They use the energy from light to carry out various cellular metabolic processes. It is a common misconception that phototrophs are obligatorily photosynthetic.
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Haptotaxis As defined above, haptotaxis is the motility of cells up a gradient of substrate bound molecules. There is a wide variety of procedures to set up this gradient in vitro for the study of haptotaxis.
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Biological Magnification Biological Magnification. Refers to the process whereby certain substances such as pesticides or heavy metals move up the food chain, work their way into rivers or lakes, and are eaten by aquatic organisms such as fish, which in turn are eaten by large birds, animals or humans.
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Photosynthesis Dark red and blue-green indicate regions of high photosynthetic activity in the ocean and on land, respectively. Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that can later be released to fuel the organisms' activities (energy transformation).
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- Phototroph. Definition. noun, plural: phototrophs. An organism, typically a plant, obtaining energy from sunlight as its source of energy to convert inorganic materials into organic materials for use in cellular functions such as biosynthesis and respiration.upplement. In order to capture light as source of energy, photoautotrophs carry out photosynthesis, converting energy from sunlight, carbon dioxide and water into organic materials. Photoautotrophs provide nutrition for many forms of life. They include the plants, algae and certain bacteria.
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Phototaxis The appearance of the signal results from a change that occurs in the rate of the primary processes of photosynthesis (electron flow and photophosphorylation) when there is a change in the intensity of light owing to the organism’s movement. Specialized phototaxis takes place by means of specialized structures. In the Euglena, such a structure consists of a paraflagellar body attached to the flagellum, and a colored stigma situated on the organism’s side. When in movement, whether in the dark or in light, the cell rotates around its longitudinal axis.
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water rheotaxis. the tendency of some plants to respond to a current of water by growing with it (positive rheotaxis) or against it (negative rheotaxis). rheotropism. the tendency of certain living things to move in response to the mechanical stimulus of a current of water. sympesiometer, sympiezometer. an instrument for measuring the pressure exerted by currents of water. See also instruments.
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- Medical Definition of BIOLUMINESCENCE. : the emission of light from living organisms; also: the light so produced. — bio·lu·mi·nes·cent \-ənt\ adjective. the emission of light from living organisms; also: the light so produced.
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Phototropism Phototropism is the growth of organisms in response to a light stimulus. It is most often observed in plants, but can also occur in other organisms such as fungi. The cells on the plant that are farthest from the light have a chemical called auxin that reacts when phototropism occurs.
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Chapter 6 Study Guide Review What Photosynthesis Is. Photosynthesis is the method by which light energy is converted to chemical energy. Autotrophs, organisms that use energy from sunlight or inorganic substances to make organic compounds, go through photosynthesis.
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Definitions &Translations Wiktionary(0.00 / 0 votes)Rate this definition: Freebase(0.00 / 0 votes)Rate this definition: Phototoxicity is a chemically induced skin irritation requiring light. The skin response resembles an exaggerated sunburn. The involved chemical may enter into the skin by topical administration or it may reach the skin via systemic circulation following ingestion or parenteral administration.
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- Phototoxicity. Phototoxicity, or photosensitization, is a reaction caused when essential oils on the skin are exposed to UV light – whether from the sun or from a tanning bed.Reactions can be severe, and even permanent.Here are some of the signs of phototoxicity:1  severe sunburn.hototoxicity. Phototoxicity, or photosensitization, is a reaction caused when essential oils on the skin are exposed to UV light – whether from the sun or from a tanning bed.