lignin meaning
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Lignin Lignin is a class of complex organic polymers that form important structural materials in the support tissues of vascular plants and some algae.[1] Lignins are particularly important in the formation of cell walls, especially in wood and bark, because they lend rigidity and do not rot easily.
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- The composition of lignin varies from species to species. An example of composition from an aspen sample is 63.4% carbon, 5.9% hydrogen, 0.7% ash, and 30% oxygen (by difference), corresponding approximately to the formula (C 31 H 34 O 11) n.
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- effector-a nerve fiber that terminates on a muscle or gland and stimulates contraction or secretion. axon, axone-long nerve fiber that conducts away from the cell body of the neuron.dendrite-short fiber that conducts toward the cell body of the neuron. nerve, nervus-any bundle of nerve fibers running to various organs and tissues of the body.efferent fiber, motor fiber-a nerve fiber that carries impulses toward the muscles or glands.xon, axone-long nerve fiber that conducts away from the cell body of the neuron. dendrite-short fiber that conducts toward the cell body of the neuron.
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myelin A whitish, fatty substance that forms a sheath around many nerve fibers. Myelin insulates the nerves and permits nerve impulses to travel more rapidly. The white matter of the brain is composed of nerve fibers covered in myelin.
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Definition of cellulose in English: Definition of cellulose - an insoluble substance which is the main constituent of plant cell walls and of vegetable fibres such as cotton. It is a polysacch Definition of cellulose - an insoluble substance which is the main constituent of plant cell walls and of vegetable fibres such as cotton. It is a polysacch dictionary
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Definitions &Translations Webster Dictionary(0.00 / 0 votes)Rate this definition: Melanin(noun) a black pigment found in the pigment-bearing cells of the skin (particularly in the skin of the negro), in the epithelial cells of the external layer of the retina (then called fuscin), in the outer layer of the choroid, and elsewhere. It is supposed to be derived from the decomposition of hemoglobin. Origin: [Gr.
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- a specialized, impulse-conducting cell that is the functional unit of the nervous system, consisting of the cell body and its processes, the axon and dendrites. neuron neûron, sinew, cord]. nerve•neu•ron (al ˈnʊər ə, nl-, ˈnyʊər nʊˈroʊn, l-) nyʊ. adjfferent neuron, sensory neuron-a neuron conducting impulses inwards to the brain or spinal cord. axon, axone-long nerve fiber that conducts away from the cell body of the neuron. dendrite-short fiber that conducts toward the cell body of the neuron.
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collagen collagen. a fibrous structural protein that constitutes the protein of the white fibers (collagenous fibers) of skin, tendon, bone cartilage and all other connective tissues. It also occurs dispersed in a gel to provide stiffening, as in the vitreous humor of the eye.It is made of monomers of tropocollagen.ollagen. a fibrous structural protein that constitutes the protein of the white fibers (collagenous fibers) of skin, tendon, bone cartilage and all other connective tissues. It also occurs dispersed in a gel to provide stiffening, as in the vitreous humor of the eye. It is made of monomers of tropocollagen.
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Lignin Lignins are one of the main classes of structural materials in the support tissues of vascular plants and some algae. Lignins are particularly important in the formation of cell walls, especially in wood and bark, because they lend rigidity and do not rot easily. Chemically lignins are cross-linked phenol polymers.
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starch maltose maltose noun a sugar formed by digesting starch or glycogen... glucose glucose noun a simple sugar found in some fruit... carbohydrate Definition of carbohydrate noun an organic compound composed of carbon, hydrogen and oxygen, e.g. sugars, cellulose and starch COMMENT: Carbohydrates are compounds of carbon, hydrogen... flaxseed flaxseed noun seed from the flax plant, crushed to produce linseed oil...
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Paper To make pulp from wood, a chemical pulping process separates lignin from cellulose fibres. This is accomplished by dissolving lignin in a cooking liquor, so that it may be washed from the cellulose; this preserves the length of the cellulose fibres.o make pulp from wood, a chemical pulping process separates lignin from cellulose fibres. This is accomplished by dissolving lignin in a cooking liquor, so that it may be washed from the cellulose; this preserves the length of the cellulose fibres.
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What is Melanin? Also called pigment, melanin is a substance that gives the skin and hair its natural color. It also gives color to the iris of the eye, feathers, and scales. In humans, those with darker skin have higher amounts of melanin.By contrast, those with less pigment have lighter or more fair skin coloring.Melanin, sometimes referred to as a chemical, is formed as part of the process of metabolizing an amino acid called tyrosine.In the skin, melanin is formed by cells called melanocytes. Certain medical conditions, such as albinism, are associated with the lack of melanin.Albinism is a condition marked by the absence of a normal amount of pigment in the body. Animals, humans, and even plants can have albinism.n humans, those with darker skin have higher amounts of melanin. By contrast, those with less pigment have lighter or more fair skin coloring. Melanin, sometimes referred to as a chemical, is formed as part of the process of metabolizing an amino acid called tyrosine.
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Lignin Lignin is an organic substance belonging to a group of aromatic alcohols. It is naturally produced by certain plants (especially woody plants and certain algal species). It is found in the secondary cell walls of plants where it serves as a binder for cellulose fibers and provides stiffness to the cell walls.
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Pembrolizumab (Keytruda) A total of 12 patients (10 adults and 2 children) received concomitant bevacizumab with pembrolizumab; side effects were minimal. All patients showed progressive tumor growth during therapy. Median OS from the start of pembrolizumab was 2.6 months in adults and 3.2 months in children; 2 glioblastoma patients underwent tumor resection following treatment with pembrolizumab.
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cellulose The definition of cellulose is the main substance that makes up the cell walls and fibers of plants. An example of cellulose is the 30% of a tree that can be made into paper. cellulose.
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SUBSTANTIAL 2 having a firm basis in reality and being therefore important meaningful or considerable 3 having substance or capable of being treated as fact not imaginary 4 providing abundant nourishment 5 of good quality and condition solidly built familiarity information substantial used as an adjective is common having a firm basis in reality and being therefore important meaningful or considerable 3 having substance or capable of being treated as fact not imaginary 4 providing abundant nourishment 5 of good quality and condition solidly built familiarity information substantial used as an adjective is common
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0 100%FREQUENCYRegularly used52 /100 Definition of linin in the English dictionary The definition of linin in the dictionary is the network of viscous material in the nucleus of a cell that connects the chromatin granules. words that rhyme with linin agglutinin
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myelin n a fatlike substance forming a sheath around certain nerve fibers. It is associated with volitional nervous system fibers and is believed to be related to the capacity of nerve structures for rapid transmission of nerve impulses. Various diseases, such as multiple sclerosis, can destroy these myelin wrappings.
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linin linin The delicate, thread-like material in the cell nucleus to which chromatin granules appear to be attached.
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- linen linen is a natural fabric obtained from the fibers of the flax stem these fibers undergo many processes to be converted finally into linen which is used to make apparels tablecloth and bed sheetslinen is soft flexible and full of lusterinen is a natural fabric obtained from the fibers of the flax stem these fibers undergo many processes to be converted finally into linen which is used to make apparels tablecloth and bed sheets
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- Fiber or fibre (from the Latin fibra[1]) is a natural or synthetic substance that is significantly longer than it is wide.[2] Fibers are often used in the manufacture of other materials. The strongest engineering materials often incorporate fibers, for example carbon fiber and ultra-high-molecular-weight polyethylene.
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Lignin He named the substance “lignine”, which is derived from the Latin word lignum, meaning wood. It is one of the most abundant organic polymers on Earth, exceeded only by cellulose. Lignin constitutes 30% of non-fossil organic carbon and a quarter to a third of the dry mass of wood.
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Lignin The conventional method for lignin quantitation in the pulp industry is the Klason lignin and acid-soluble lignin test, which is standardized according to SCAN or NREL procedure. The cellulose is first decrystallized and partially depolymerized into oligomers by keeping the sample in 72% sulfuric acid at 30 C for 1 h.
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Tolonium chloride Toluidine blue solution is used in testing for lignin, a complex organic molecule that bonds to cellulose fibres and strengthens and hardens the cell walls in plants.A positive toluidine blue test causes the solution to turn from blue to pink.oluidine blue solution is used in testing for lignin, a complex organic molecule that bonds to cellulose fibres and strengthens and hardens the cell walls in plants.
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melanin melanin in Medicine. melanin mel·a·nin (měl'ə-nĭn) n. Any of a group of naturally occurring dark pigments composed of granules of highly irregular polymers that usually contain nitrogen or sulfur atoms, especially the pigment found in skin, hair, fur, and feathers.