| 单词 | vacuole |
| 例句 | Food captured in the oral groove enters a food vacuole, where it combines with digestive enzymes. Fundamentals of Biology 2015-01-01T00:00:00Z Additionally, enzymes within plant vacuoles can break down macromolecules. Concepts of Biology 2013-04-25T00:00:00Z Increasing the acidity inside the vacuole may decrease it outside the vacuole, causing enzymes there to work faster and wear out sooner, which may also help explain the higher death rate among these altered cells. Scientists engineer the first light-powered yeast 2023-04-18T04:00:00Z It has a cell wall enclosing nuclear membrane, cytoplasm, mitochondria, vacuoles and nucleoid region with genetic material. Biology for AP Courses 2022-06-09T00:00:00Z Many plant cells have a single, large central vacuole. Miller & Levine Biology 2018-01-01T00:00:00Z Contractile vacuoles allow the organism to excrete excess water. Fundamentals of Biology 2015-01-01T00:00:00Z That is because as the water concentration in the soil becomes lower than the water concentration in the plant, water moves out of the central vacuoles and cytoplasm and into the soil. Concepts of Biology 2013-04-25T00:00:00Z So Burnetti looked instead for rhodopsin already known to exist in vacuoles. Scientists engineer the first light-powered yeast 2023-04-18T04:00:00Z For example, contractile vacuoles are common in microorganisms; flame cells and nephridia in certain species and worms, and Malpighian tubules in insects are other examples of excretory systems. Biology for AP Courses 2022-06-09T00:00:00Z The pressure of the liquid in the central vacuole helps plants to support structures such as leaves and stems. Miller & Levine Biology 2018-01-01T00:00:00Z That’s because the organic acids are transported out of the vacuole and broken down to release CO2, which enters the Calvin cycle. Fundamentals of Biology 2015-01-01T00:00:00Z The central vacuole also functions to store proteins in developing seed cells. Concepts of Biology 2013-04-25T00:00:00Z By attaching a green fluorescent tag to the protein, he and his colleagues verified that it had localized to the yeast’s vacuole, as they hoped. Scientists engineer the first light-powered yeast 2023-04-18T04:00:00Z Bacteria are unicellular, prokaryotic organisms that have some of the least complex life processes in place; however, prokaryotes such as bacteria do not contain membrane-bound vacuoles. Biology for AP Courses 2022-06-09T00:00:00Z In addition to vacuoles, most eukaryotic cells contain smaller membrane-enclosed structures called vesicles. Miller & Levine Biology 2018-01-01T00:00:00Z The organic acid is stored inside vacuoles until the next day. Fundamentals of Biology 2015-01-01T00:00:00Z If you look at Figure 3.7, you will see that plant cells each have a large, central vacuole that occupies most of the cell. Concepts of Biology 2013-04-25T00:00:00Z Plant cells have a rigid cell wall that is external to the plasma membrane, chloroplasts, plasmodesmata, and plastids used for storage, and a large central vacuole, whereas animal cells do not. Environmental Biology 2018-09-06T00:00:00Z The simplest system is that of contractile vacuoles present in microorganisms. Biology for AP Courses 2022-06-09T00:00:00Z The resulting pocket breaks away from the cytoplasmic side of the cell membrane, forming a vesicle or vacuole in the cytoplasm. Miller & Levine Biology 2018-01-01T00:00:00Z T. magnifica circumvents this problem by placing a large vacuole — essentially a scuba tank of nitrate that helps it breathe — right at the center of its cylindrical body. Scientists baffled by discovery of bacteria that ought to be too big to function 2022-06-23T04:00:00Z In plant cells, the liquid inside the central vacuole provides turgor pressure, which is the outward pressure caused by the fluid inside the cell. Concepts of Biology 2013-04-25T00:00:00Z One key difference: It has a large central compartment, or vacuole, that allows some cell functions to happen in that controlled environment instead of throughout the cell. World’s biggest bacterium found in Caribbean mangrove swamp 2022-06-23T04:00:00Z Which statement about contractile vacuoles in microorganisms is true? Biology for AP Courses 2022-06-09T00:00:00Z Phagocytosis is a kind of endocytosis in which extensions of the cell surround a particle and package it within a food vacuole. Miller & Levine Biology 2018-01-01T00:00:00Z This vacuole pushes the cell’s essential proteins, sugars and metabolites against its membrane, facilitating easier diffusion. Scientists baffled by discovery of bacteria that ought to be too big to function 2022-06-23T04:00:00Z Vacuoles are somewhat larger than vesicles, and the membrane of a vacuole does not fuse with the membranes of other cellular components. Concepts of Biology 2013-04-25T00:00:00Z The authors therefore engineered AbLS to become a transmembrane protein — these proteins are transported from the TGN to the vacuole by default. Genetically engineered yeast makes medicinal plant products 2020-09-01T04:00:00Z How do contractile vacuoles work as excretory systems in microorganisms? Biology for AP Courses 2022-06-09T00:00:00Z Tiny pockets form along the cell membrane, fill with liquid, and pinch off to form vacuoles. Miller & Levine Biology 2018-01-01T00:00:00Z These drugs bind to the released haem in the digestive vacuole and prevent the compound’s detoxification by the parasite — in effect, poisoning the parasite with its own metabolic debris4. Malaria parasites fine-tune mutations to resist drugs 2019-11-26T05:00:00Z The pocket pinches off, resulting in the particle being contained in a newly created vacuole that is formed from the plasma membrane. Concepts of Biology 2013-04-25T00:00:00Z This AbLS variant is able to catalyse littorine production in the vacuole. Genetically engineered yeast makes medicinal plant products 2020-09-01T04:00:00Z Contractile vacuoles excrete excess water and waste by the process of endocytosis, in which these vacuoles merge with cell membrane and expel wastes into the environment. Biology for AP Courses 2022-06-09T00:00:00Z In exocytosis, the membrane of a vesicle or vacuole fuses with the cell membrane, forcing the contents of the vacuole out of the cell. Miller & Levine Biology 2018-01-01T00:00:00Z The cavity opens on to the digestive vacuole, but closes about halfway through the membrane. Malaria parasites fine-tune mutations to resist drugs 2019-11-26T05:00:00Z Plant cells have a cell wall, chloroplasts, and a central vacuole. Concepts of Biology 2013-04-25T00:00:00Z After knocking out the usual tether between the ER and mitochondria in yeast, both groups found5,6 that lipids could still travel in a relay-like fashion between the two organelles through a back-channel — the vacuole. How secret conversations inside cells are transforming biology 2019-03-10T05:00:00Z Contractile vacuoles excrete uric acid by the process of exocytosis, in which water as well as uric acid is excreted by contraction of a cell when the vacuole merges with the cell membrane. Biology for AP Courses 2022-06-09T00:00:00Z Cells remove water by means of a contractile vacuole and exocytosis. Miller & Levine Biology 2018-01-01T00:00:00Z Figure 1 | Mutations affect the transport of antimalarial drugs through the PfCRT protein. a, The drugs chloroquine and piperaquine target a membrane-bound organelle in the malaria parasite, called the digestive vacuole. Malaria parasites fine-tune mutations to resist drugs 2019-11-26T05:00:00Z The central vacuole expands, enlarging the cell without the need to produce more cytoplasm. Concepts of Biology 2013-04-25T00:00:00Z From the ER to the Golgi to the vacuole to the endosome, each organelle is still shown in isolation, not as a dynamic dance of parts that continuously embrace and separate. How secret conversations inside cells are transforming biology 2019-03-10T05:00:00Z Contractile vacuoles excrete excess water and uric acid by the process of endocytosis when the vacuole merges with the cell membrane. Biology for AP Courses 2022-06-09T00:00:00Z In 2014, Koes’s team discovered a new kind of vacuole pump inside the cells of red petunias, one thought previously to exist only in the outer cell membrane. What makes petunias red also makes lemons sour 2019-02-26T05:00:00Z A limitation of the new structure is that PfCRT is locked in a conformation in which it is open to the digestive vacuole, as a result of Fab binding in its central cavity. Malaria parasites fine-tune mutations to resist drugs 2019-11-26T05:00:00Z Plant cells have a cell wall, chloroplasts, plasmodesmata, and plastids used for storage, and a large central vacuole, whereas animal cells do not. Concepts of Biology 2013-04-25T00:00:00Z For part of its life cycle, this organism resides inside human red blood cells in a membrane-bound compartment called a vacuole. Spotlght on proteins that aid malaria 2018-08-26T04:00:00Z Contractile vacuoles excrete excess water and waste by the process of exocytosis, in which the vacuoles merge with the cell membrane and expel wastes into the environment. Biology for AP Courses 2022-06-09T00:00:00Z This pump was more powerful, able to pull enough protons together into vacuoles to keep petunia flowers red. What makes petunias red also makes lemons sour 2019-02-26T05:00:00Z Parasites from the Leishmania genus live and replicate inside a membrane-bound vacuole in macrophage cells of the immune system. Drug candidate and target for leishmaniasis 2018-07-24T04:00:00Z Here we combine the in vivo and in vitro fusion of yeast vacuoles with molecular simulations to show that tethering proteins are critical for overcoming the final energy barrier to fusion pore formation. A tethering complex drives the terminal stage of SNARE-dependent membrane fusion 2017-10-31T04:00:00Z The ‘mouth’ of EXP2 constitutes the bulk of the protein, and faces into the vacuole. Spotlght on proteins that aid malaria 2018-08-26T04:00:00Z Vesicles and vacuoles store substances, and in plant cells, the central vacuole stores pigments, salts, minerals, nutrients, proteins, and degradation enzymes and helps maintain rigidity. Biology for AP Courses 2022-06-09T00:00:00Z Also floating in that cytoplasm are little sacs called vacuoles, containing a protein called alliinase, which is like a little drill sergeant of the process. Why Onions Make You Cry 2017-09-05T04:00:00Z It infects host immune cells called macrophages and resides in a membrane-bound vacuole. Drug candidate and target for leishmaniasis 2018-07-24T04:00:00Z Finally, at :51 you see a special star-burst shaped organelle called the contractile vacuole in action. Everyone Poops, Even Paramecium 2014-05-08T13:30:27Z In anammox bacteria, there is a giant vacuole, or bag, called an annamoxosome where the denitrifying reactions — i.e., eating and breathing for the bacterium — transpire. Missing Nitrogen May Be Vanishing in the Tubes of Giant Bacteria 2013-10-30T20:45:02.837Z The plant cell has a cell wall, chloroplasts, plastids, and a central vacuole—structures not found in animal cells. Biology for AP Courses 2022-06-09T00:00:00Z Toxoplasma, in contrast, divides while still inside its vacuole, only abandoning it after blowing up the host cell. Theileria gets naked and rides the spindle 2013-07-27T11:45:00.660Z The food vacuole seems to be acidic, just like our stomach, based on its reaction to the various dies and labels the scientists used. Green Alga Found to Prey on Bacteria, Bolstering Endosymbiotic Theory 2013-06-30T19:15:01.987Z Recent experiments on suggest it does this by actively pumping ions into the vacuole to make the inside saltier still than the rest of the cell’s contents. Everyone Poops, Even Paramecium 2014-05-08T13:30:27Z In order to protect itself from attacks from the cells defence system, the bacteria stays safely wrapped up in a vacuole inside the cell. How to eat your host: Pathways for nutrition in Salmonella 2013-05-07T00:15:02.883Z Additionally, some agents such as enzymes within plant vacuoles break down macromolecules. Biology for AP Courses 2022-06-09T00:00:00Z Theileria, on the other hand, likes to get more intimate with its host — sometime after a successful invasion, it sheds the parasitophorous vacuole altogether by dissolving its membrane. Theileria gets naked and rides the spindle 2013-07-27T11:45:00.660Z In some protists, the contractile vacuole simply fuses with the membrane and expels its contents, but there are also plenty of variations on the subject. Frontonia: dissecting a ciliate appetite 2012-11-20T14:45:03.977Z Notice how the radiating collecting tubes dump their contents into the central vacuole one by one. Everyone Poops, Even Paramecium 2014-05-08T13:30:27Z The large multinucleate animal withdraws its pseudopods, its vacuoles disappear, it encysts and its nuclei diminish in number to about 1⁄20th partly by fusion, 2 and 2, probably by digestion of the majority. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z Plant cells have a cell wall, chloroplasts and other specialized plastids, and a large central vacuole, whereas animal cells do not. Biology for AP Courses 2022-06-09T00:00:00Z Within its bioplasm a clear space or vacuole may often be distinguished. The Contemporary Review, Volume 36, October 1879 2012-04-18T02:00:17.060Z In the ability of Amoeba to contract into a spherical mass, and in the presence in its protoplasm of the contractile vacuole, we see another type of spontaneous movement—contractility—of the protoplasm. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z Later on this vacuole disappears, and the grains of pigment make their appearance. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" 2011-12-26T03:00:11.613Z One or more contractile vacuoles may protrude from the ectoplasm. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z In plant cells, the digestive processes take place in vacuoles. Biology for AP Courses 2022-06-09T00:00:00Z A unicellular animal takes organic particles bodily into its protoplasm, and forming around them temporary cavities known as food vacuoles, treats them chemically. The Biological Problem of To-day Preformation Or Epigenesis? The Basis of a Theory of Organic Development 2011-08-29T02:01:04.170Z Drifting into an electromagnetic field with a vacuole full of hemozoin is about as brainy as stepping into a microwave with a stomach full of nails. Malaria Gets the Foil-in-a-Microwave Treatment 2011-08-22T18:47:37Z A young trophozoite which is becoming a gametocyte is distinguished from one which gives rise to a schizont by its much slower rate of growth, and the absence of any vacuoles in its cytoplasm. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" 2011-12-26T03:00:11.613Z The edge was beautifully fringed with a circle of cilia; in an inner circle was a row of locomotive organs, and the centre exhibited vacuoles constantly opening and shutting. Marvels of Pond-life A Year's Microscopic Recreations 2011-08-01T02:00:12.067Z The cavities in the plasma membrane that form the vacuoles have membrane receptors and lipid rafts in addition to caveolin. Biology for AP Courses 2022-06-09T00:00:00Z This group differs from the preceding in its simple test, but, like it, includes many fresh-water species, which possess contractile vacuoles. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 6 "Foraminifera" to "Fox, Edward" 2011-04-22T02:00:08.637Z Rather, she says, the crystals appear to form because the vacuoles in which they collect are rich in sulfate. Algae holds promise for nuclear clean-up 2011-03-30T19:45:08.487Z A single zooid of the same. a = nucleus. b = contractile vacuole. c = the characteristic “collar” of naked streaming protoplasm. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 4 "Finland" to "Fleury, Andre" 2011-03-20T02:00:30.697Z When elongated their bodies were somewhat pear-shaped, but more slender, and variegated with vacuoles and particles of food. Marvels of Pond-life A Year's Microscopic Recreations 2011-08-01T02:00:12.067Z Paramecia are unicellular protists that have contractile vacuoles to remove excess intracellular water. Biology for AP Courses 2022-06-09T00:00:00Z The endoplasm is more fluid, and contains numerous inclusions of a granular nature, as well as vacuoles of varying size. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z Perhaps they are simply waste, forming by accident in vacuoles that serve as storage depots for sulfate, said Krejci. Algae holds promise for nuclear clean-up 2011-03-30T19:45:08.487Z Contractile vacuoles 1-3, a complex of variable arrangement; pellicle delicate; plastids discoid chlorophyll-bodies; reserves oil; eye-spot absent even in active state; holophytic or saprophytic, though with an anterior blind tubular depression simulating a pharynx. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 4 "Finland" to "Fleury, Andre" 2011-03-20T02:00:30.697Z The branches of the tube stopped somewhat abruptly just before reaching the surface, and were often observed to end in small round vacuoles or vesicles. Marvels of Pond-life A Year's Microscopic Recreations 2011-08-01T02:00:12.067Z The rate at which a Paramecium's contractile vacuole contracted to pump out excess water was determined and plotted against osmolarity of the solutions, as shown in the graph. Biology for AP Courses 2022-06-09T00:00:00Z This organism is remarkable in one or two ways: it possesses a contractile vacuole; the amoeboid trophozoites tend to form plasmodia; and the spores, of the usual simple type, may apparently divide by binary fission. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z It might also be possible to improve the process by tinkering with sulfate levels in the environment, thereby changing the amount of sulfate in the vacuoles. Algae holds promise for nuclear clean-up 2011-03-30T19:45:08.487Z Colony seen from the flat side; � 300. a = nucleus. b = contractile vacuole. c = amylon nucleus. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 4 "Finland" to "Fleury, Andre" 2011-03-20T02:00:30.697Z The amoeba verrucosa now appeared enclosed in a large oval, clear vacuole or space, was constricted so as to be gourd-shaped, and had lost all trace of its vesicle. The Galaxy Vol. XXIII?March, 1877.?No. 3 2011-01-31T03:00:16.193Z The contractile vacuole is less efficient in solutions of high osmolarity because of the reduced amount of ATP produced from cellular respiration. Biology for AP Courses 2022-06-09T00:00:00Z They appear to be naked, and consist of finely granular protoplasm, containing a single nucleus and one or two vacuoles. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z You may also be able to see vacuoles, looking like holes in the stained protoplasm. A Guide for the Study of Animals 2011-01-18T03:00:14.913Z It can develop vacuoles, or rather fine bubbles of carbonic acid gas in its cytoplasm, to float up to the surface of the water. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 4 "Aram, Eugene" to "Arcueil" The solvent is imprisoned in the vacuoles of the clot, and is expelled little by little by its retraction. The Mechanism of Life In addition, plant cells have cell walls, plastids, and a large central vacuole: structures that are not found in animal cells. Biology for AP Courses 2022-06-09T00:00:00Z They enlarge and diminish, and are possibly excretory like the “contractile vacuoles” of other Protista; though it has been suggested that by their communication with the medium they subserve nutrition. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 "Dinard" to "Dodsworth" Assuming them to have been of approximately equal sizes when they were taken in, how can you account for differences now?Where are the contracting vacuoles? A Guide for the Study of Animals 2011-01-18T03:00:14.913Z The greater part of the cavity of the cell is occupied by one or several fluid vacuoles. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 "Diameter" to "Dinarchus" All strains show involution form, exhibiting vacuoles, and often show empty cell membranes. The Bacillus of Long Life a manual of the preparation and souring of milk for dietary purposes, together with and historical account of the use of fermente The membrane of a vacuole does not fuse with the membranes of other cellular components. Biology for AP Courses 2022-06-09T00:00:00Z "Whether the thread is hollow or solid, simple or branched, free or connected with the peridium or a columella,—these are entirely secondary conditions, depending on the extent and form of the vacuoles." The North American Slime-Moulds A Descriptive List of All Species of Myxomycetes Hitherto Reported from the Continent of North America, with Notes on Some Extra-Limital Species Contracting or pulsating vacuoles, small, clear spots in a cell, filled with a watery fluid. A Guide for the Study of Animals 2011-01-18T03:00:14.913Z This is filled with a granular protoplasm, in which vacuoles are formed. Fungi: Their Nature and Uses We have received the impression that we have here to deal with a vacuole filled with substance secreted by the cell. Histology of the Blood Normal and Pathological The central vacuole plays a key role in regulating the cell’s concentration of water in changing environmental conditions. Biology for AP Courses 2022-06-09T00:00:00Z Sap vacuoles must be distinguished from spores, on the one hand, and the vacuolated appearance due to plasmolysis, on the other. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. The substance of the bacterial cell when suitably prepared Cell-contents. and stained shows in the larger forms a mass of homogeneous protoplasm containing irregular spaces, the vacuoles, which enclose a watery fluid. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy" The protoplasm, at first uniformly distributed in all the conidia, appears strewn with semi-lenticular, and nearly equidistant vacuoles, of which the plane face is immediately in contact with the periphery of the protoplasm. Fungi: Their Nature and Uses The number of the vacuole containing cells is 15-20% of the colourless blood corpuscles. Histology of the Blood Normal and Pathological The central vacuole also supports the expansion of the cell. Biology for AP Courses 2022-06-09T00:00:00Z A thin cell-wall encloses the granular protoplasm, in which vacuoles and sometimes a nucleus may be noted. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. Vacuolate: with vacuoles or small cavities, empty or filled with a watery fluid. Explanation of Terms Used in Entomology A short time after the appearance of the vacuoles the entire conidium extends itself so that the papilla disappears. Fungi: Their Nature and Uses A cell without a cell wall. n, nucleus; v, vacuoles, × 300. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Plant cells and plant-like cells each have a cell wall, chloroplasts, and a central vacuole. Biology for AP Courses 2022-06-09T00:00:00Z The large mononuclear cells often contain vacuoles—"Kurlow cells"—possibly of a parasitic nature. The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. A, Germinating spores. s, Wall of spore; v, vacuole; w, rhizoid. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" This is deprived of a distinct membrane, the vacuoles that disappeared in the expulsion again become visible, but soon disappear for a second time. Fungi: Their Nature and Uses At each end of the cell is a vacuole containing small granules that show an active dancing movement. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses The central vacuole can expand without having to produce more cytoplasm. Biology for AP Courses 2022-06-09T00:00:00Z The contractile vacuole is generally on the right side and similarly located. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 In the higher plants, at least, a nucleus occurs embedded in it; a watery liquid holding salts and saccharine substances in solution fills the space called the vacuole, inclosed by the protoplasm. Scientific American Supplement, No. 623, December 10, 1887 The zoospores are oval or semi-oval, and in P. infestans the two cilia spring from the same point on the inferior border of the vacuole. Fungi: Their Nature and Uses The sphere is filled with protoplasm, in which there is a nucleus and one or more gaps, or "vacuoles." Young Folks' Library, Volume XI (of 20) Wonders of Earth, Sea and Sky Vesicles and vacuoles are storage and transport compartments. Biology for AP Courses 2022-06-09T00:00:00Z There is always one nucleus and one vacuole, but both may be more numerous. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 Close to the origin of these cilia, in the substance of the body, is a regularly pulsating, contractile vacuole. Discourses Biological and Geological Essays The ripe endospore is a thick, smooth, colourless membrane, composed of cellulose containing a bed of finely granulated protoplasm, which surrounds a great central vacuole. Fungi: Their Nature and Uses Under this is a soft medullary substance, which consists of entodermic cells with vacuoles. The Evolution of Man — Volume 2 In plant cells, vacuoles also help break down macromolecules. Biology for AP Courses 2022-06-09T00:00:00Z Contractile vacuole absent, and a nucleus was not seen. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 Such a structure is of common occurrence among the lowest plants and animals, and is known as a contractile vacuole. Discourses Biological and Geological Essays Within a gland which had caught a small insect, one such mass was observed to undergo incessant changes of form, with the occasional appearance of vacuoles. Insectivorous Plants The posterior part is granular and usually filled with food particles; it is well rounded and holds the nucleus and contractile vacuole. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 For example, paramecia and amoebas, which are protists that lack cell walls, have contractile vacuoles. Biology for AP Courses 2022-06-09T00:00:00Z Contractile vacuole absent; the nucleus is spherical and contains many large chromatin granules. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The contractile vacuole lies on one side, near the girdle. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The central portion of the body is developed into a more or less arched dorsal mass, which usually contains the nuclei and contractile vacuoles. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The contractile vacuole lies posteriorly, on the right side and in the dorsal swelling. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 If you look at Figure 4.8b, you will see that plant cells each have a large central vacuole that occupies most of the area of the cell. Biology for AP Courses 2022-06-09T00:00:00Z There is one central nucleus and usually one contractile vacuole. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 Contractile vacuoles are numerous, dorsal in position and on the right side. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The contractile vacuole may be single or multiple, usually in the posterior region of the body and dorsal in position. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 Unlike the fresh-water variety, this one has no hyaline margin nor hyaline caudal region, and the contractile vacuole is double or multiple on the dorsal side near the posterior end. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 That’s because as the water concentration in the soil becomes lower than the water concentration in the plant, water moves out of the central vacuoles and cytoplasm. Biology for AP Courses 2022-06-09T00:00:00Z The nucleus is minute and lateral in position; the contractile vacuole is in the posterior end of the body. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The contractile vacuoles are quite varied and from one to many in number, the number increasing with the size of the individual. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The specimens observed at Woods Hole had numerous contractile vacuoles and were 42 to 45µ long and from 28 to 32µ wide. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 Two to four contractile vacuoles are placed on the ventral side. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 As the central vacuole shrinks, it leaves the cell wall unsupported. Biology for AP Courses 2022-06-09T00:00:00Z The nucleus is usually anterior, and one or two contractile vacuoles are present. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 There are two contractile vacuoles, one behind the center of the buccal armature, the other near the inner end of this organ. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 There are 1 or 2 vacuoles with long canals radiating throughout the endoplasm. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The contractile vacuole is on the left side, the spheroidal nucleus on the right side of the furrow. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 When the central vacuole holds more water, the cell gets larger without having to invest a lot of energy in synthesizing new cytoplasm. Biology for AP Courses 2022-06-09T00:00:00Z There are two contractile vacuoles and one nucleus, which is situated a little above the body center. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The contractile vacuole is posterior and dorsal to the long axis of the body. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The contractile vacuole is terminal or subterminal and near the anal opening. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The contractile vacuole is posterior in front of the bristle. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 Vesicles and vacuoles are storage and transport compartments. Biology for AP Courses 2022-06-09T00:00:00Z The contractile vacuole lies in the anterior half of the body. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The contractile vacuole is subterminal and dorsal; it is questionable whether there are canals leading to it. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The contractile vacuole is central and dorsal; the macronucleus is in the anterior half of the body, with one attached micronucleus. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The macronucleus is central, and the contractile vacuole posterior and terminal. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 In plant cells, vacuoles also help break down macromolecules. Biology for AP Courses 2022-06-09T00:00:00Z The contractile vacuole is close to the base of the flagella. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The contractile vacuole is posterior and terminal, and may be multiple. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 A row of contractile vacuoles extends from the posterior end. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 It differs from the former, however, in the absence of a tentacle-like process, and from both in the absence of a double nucleus and in the presence of many vacuoles. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 Plant cells and plant-like cells each have a cell wall, chloroplasts, and a central vacuole. Biology for AP Courses 2022-06-09T00:00:00Z The contractile vacuole is in the anterior neck-like portion of the body. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 Like the latter, there is one caudal bristle, but unlike it there is only one posterior contractile vacuole, while the endoplasm is filled with large granules or food balls. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The contractile vacuoles are usually placed in rows upon the edges. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The contractile vacuole is single and is located at the pointed end, which is directed backwards during locomotion. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The central vacuole can expand without having to produce more cytoplasm. Biology for AP Courses 2022-06-09T00:00:00Z The flagellum is inserted in a distinct œsophageal tube, into which the contractile vacuole empties. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 One important difference is the presence of only one contractile vacuole in the marine form. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The contractile vacuole is simple, and posterior in position. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 His was a fresh-water type; this is marine, but the caudal filament and the contractile vacuole are similar. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 Rice plants grown in high-salt environments can actively transport sodium ions into the vacuole by the antiporter movement of protons out of the vacuole. Biology for AP Courses 2022-06-09T00:00:00Z Food vacuoles are present in the posterior part. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The anterior process with its pigment spot; the cirri, the spherical nucleus, the position of the vacuole, etc., are all opposed to such an interpretation which Kent applied to the original species. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 One contractile vacuole is situated in the dorsal swelling at the posterior end of the animal. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The macronucleus is double; the contractile vacuole is central and on the left side. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 Briefly explain negative feedback regulation of the movement of sodium into the vacuole of rye cells. Biology for AP Courses 2022-06-09T00:00:00Z Contractile vacuole terminal, with sometimes one or two further forward. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The single contractile vacuole lies on the right side in the region of the anal cirri, sometimes just above them, sometimes below. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The contractile vacuole lies on the right side dorsal to the posterior cirri. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The nucleus and contractile vacuole are similar to those of the preceding species. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The contractile vacuole is on the right side in the vicinity of the anal cirri. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 This form differs slightly from others of the same species as described by different observers, the most striking difference being the presence of two contractile vacuoles in place of the usual one. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The contractile vacuole lies dorsal to the anal cirri and anterior to the three dorsal cirri. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The contractile vacuole is on the left side between the main groups of cirri. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The contractile vacuole lies between the two sets of posterior cirri. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The peristome, contractile vacuole, and nucleus are similar to the preceding. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The contractile vacuole is terminal, the proboscis is short, slightly raised and separated from the body by a deep cleft; the buccal cilia are inserted part way up on the proboscis. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The contractile vacuole is on the left side in the region of the mouth. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 Contractile vacuole, single or double, usually connected with a sac-like reservoir. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 There are one or two contractile vacuoles in the distal half of the body. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 The contractile vacuole is in the anterior third of the body about midway between the bundles of tentacles. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 |
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