plasmolysis

plas·mol·y·sis

P0355400 (plăz-mŏl′ĭ-sĭs)n. pl. plas·mol·y·ses (-sēz′) Shrinkage or contraction of the protoplasm away from the wall of a living plant or bacterial cell, caused by loss of water through osmosis.

plas′mo·lyt′ic (plăz′mə-lĭt′ĭk) adj.plas′mo·lyt′i·cal·ly adv.

plasmolysis

(plæzˈmɒlɪsɪs) n (Botany) the shrinkage of protoplasm away from the cell walls that occurs as a result of excessive water loss, esp in plant cells. See exosmosis plasmolytic adj ˌplasmoˈlytically adv

plas′mol′y•sis

(plæzˈmɒl ə sɪs)

n. the separation of protoplasm from a cell wall when water is removed by exosmosis. [1880–85] plas`mo•lyt′ic (-ˈlɪt ɪk) adj. plas`mo•lyt′i•cal•ly, adv.

plasmolysis

Shrinkage of a plant cell caused by water loss.

Plasmolysis

plasmolysis

[plaz′mäl·ə·səs] (physiology) Shrinking of the cytoplasm away from the cell wall due to exosmosis by immersion of a plant cell in a solution of higher osmotic activity.

Plasmolysis

the loosening of the protoplast from the cell cover when a cell is immersed in a hypertonic solution. Plasmolysis is characteristic mainly of plant cells, which have a sturdy cellulose cover. Animal cells contract when transferred to a hypertonic solution. Plasmolysis may be convex, concave, convulsive, or mitriform. These variations are determined by the viscosity of the protoplasm, the difference between the osmotic pressure of the cell and that of the external solution, and the speed and degree of water loss by the protoplasm. Sometimes plasmolyzed cells remain alive; when such cells are immersed in water or a hypotonic solution, deplasmolysis occurs.

There are two methods for comparative evaluation of plasmolysis: borderline plasmolysis and the plasmometric method. The first method, developed by H. de Vries in 1884, consists of immersing tissues in solutions with various concentrations of KNO₃, sucrose, or other osmotically active substances and establishing the concentration at which 50 percent of the cells are plasmolyzed. With the plasmometric method, the relative volumes of the cell and the protoplast are measured after plasmolysis, and the osmotic pressure of the cell is calculated according to appropriate formulas from the concentration of the solution.

V. V. KABANOV

plasmolysis

[plaz-mol´ĭ-sis] contraction of cell protoplasm due to loss of water by osmosis. adj., adj plasmolyt´ic.

plas·mol·y·sis

(plaz-mol'i-sis), Shrinking of plant cells by osmotic loss of cytoplasmic water. Synonym(s): protoplasmolysis [plasmo- + G. lysis, dissolution]

plasmolysis

(plăz-mŏl′ĭ-sĭs)n. pl. plasmoly·ses (-sēz′) Shrinkage or contraction of the protoplasm away from the wall of a living plant or bacterial cell, caused by loss of water through osmosis.

plas′mo·lyt′ic (plăz′mə-lĭt′ĭk) adj.plas′mo·lyt′i·cal·ly adv.

plas·mol·y·sis

(plaz-mol'i-sis) 1. Dissolution of cellular components. 2. Shrinking of plant cells by osmotic loss of cytoplasmic water. [plasmo- + G. lysis, dissolution]

plasmolysis

Shrinkage or dissolution of the protoplasm in a cell.

plasmolysis

the shrinkage of plant cell contents due to loss of water, resulting in the CELL MEMBRANE pulling away from the cell wall, leaving a fluid-filled space. Plasmolysis occurs when plant cells are placed in a hypertonic (see HYPOTONIC medium so that they lose water by OSMOSIS. See Fig. 254 .

单词	plasmolysis
释义	plasmolysis plas·mol·y·sis P0355400 (plăz-mŏl′ĭ-sĭs)n. pl. plas·mol·y·ses (-sēz′) Shrinkage or contraction of the protoplasm away from the wall of a living plant or bacterial cell, caused by loss of water through osmosis. plas′mo·lyt′ic (plăz′mə-lĭt′ĭk) adj.plas′mo·lyt′i·cal·ly adv. plasmolysis (plæzˈmɒlɪsɪs) n (Botany) the shrinkage of protoplasm away from the cell walls that occurs as a result of excessive water loss, esp in plant cells. See exosmosis plasmolytic adj ˌplasmoˈlytically adv plas′mol′y•sis (plæzˈmɒl ə sɪs) n. the separation of protoplasm from a cell wall when water is removed by exosmosis. [1880–85] plas`mo•lyt′ic (-ˈlɪt ɪk) adj. plas`mo•lyt′i•cal•ly, adv. plasmolysis Shrinkage of a plant cell caused by water loss. Plasmolysis plasmolysis [plaz′mäl·ə·səs] (physiology) Shrinking of the cytoplasm away from the cell wall due to exosmosis by immersion of a plant cell in a solution of higher osmotic activity. Plasmolysis the loosening of the protoplast from the cell cover when a cell is immersed in a hypertonic solution. Plasmolysis is characteristic mainly of plant cells, which have a sturdy cellulose cover. Animal cells contract when transferred to a hypertonic solution. Plasmolysis may be convex, concave, convulsive, or mitriform. These variations are determined by the viscosity of the protoplasm, the difference between the osmotic pressure of the cell and that of the external solution, and the speed and degree of water loss by the protoplasm. Sometimes plasmolyzed cells remain alive; when such cells are immersed in water or a hypotonic solution, deplasmolysis occurs. There are two methods for comparative evaluation of plasmolysis: borderline plasmolysis and the plasmometric method. The first method, developed by H. de Vries in 1884, consists of immersing tissues in solutions with various concentrations of KNO₃, sucrose, or other osmotically active substances and establishing the concentration at which 50 percent of the cells are plasmolyzed. With the plasmometric method, the relative volumes of the cell and the protoplast are measured after plasmolysis, and the osmotic pressure of the cell is calculated according to appropriate formulas from the concentration of the solution. V. V. KABANOV plasmolysis plasmolysis [plaz-mol´ĭ-sis] contraction of cell protoplasm due to loss of water by osmosis. adj., adj plasmolyt´ic. plas·mol·y·sis (plaz-mol'i-sis), Shrinking of plant cells by osmotic loss of cytoplasmic water. Synonym(s): protoplasmolysis [plasmo- + G. lysis, dissolution] plasmolysis (plăz-mŏl′ĭ-sĭs)n. pl. plasmoly·ses (-sēz′) Shrinkage or contraction of the protoplasm away from the wall of a living plant or bacterial cell, caused by loss of water through osmosis. plas′mo·lyt′ic (plăz′mə-lĭt′ĭk) adj.plas′mo·lyt′i·cal·ly adv. plas·mol·y·sis (plaz-mol'i-sis) 1. Dissolution of cellular components. 2. Shrinking of plant cells by osmotic loss of cytoplasmic water. [plasmo- + G. lysis, dissolution] plasmolysis Shrinkage or dissolution of the protoplasm in a cell. plasmolysis the shrinkage of plant cell contents due to loss of water, resulting in the CELL MEMBRANE pulling away from the cell wall, leaving a fluid-filled space. Plasmolysis occurs when plant cells are placed in a hypertonic (see HYPOTONIC medium so that they lose water by OSMOSIS. See Fig. 254 .
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