fluid mosaic model
fluid mosaic model A widely accepted model, proposed by S. J. Singer and G. L. Nicholson in the 1970s, for the structure of cell membranes. It is based on a
lipid bilayer forming the framework of the membrane, with proteins randomly embedded in it; these proteins may be restricted to either lipid layer (
extrinsic proteins) or they may span both (
intrinsic proteins), producing an asymmetric structure (see illustration). This structure allows the lateral movement of the constituent phospholipid and protein molecules of the membrane.
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Isoetes melanopoda spp. silvatica (subsp. nov.), a New Quillwort (Isoetaceae) From Eastern North America
Magazine article from: Castanea; 3/1/2006; ; 700+ words
; ABSTRACT Isoetes melanopoda, a diploid species of ephemeral prairie wetland swales primarily in central North America, has also been found in swamp forests over a wide area of eastern North America in recent years. Determination of certain morphological and ecological characteristics (leaf width,
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PTERIDOPHYTES OF NORTHEAST ALABAMA AND ADJACENT HIGHLANDS.
Magazine article from: Journal of the Alabama Academy of Science; 10/1/2000; ; 700+ words
; ...Engelm.) A.A. Eaton, Scouring-rush DIVISION LYCOPODIOPHYTA ISOETACEAE (Quillwort Family) Isoetes butleri Engelm., Glade Quillwort; Butler's Quillwort.* S2 I. engelmannii A. Br., Appalachian Quillwort; Engelmann's Quillwort...
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 "Herald News, The (Joliet, IL)")
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'THE BEST OF THE BEST'
Newspaper article from: Herald News, The (Joliet, IL); 7/31/2006; ; 700+ words
; ...Dalea foliosa (left), and Butler's quillwort, or Isoetes butleri (right), are...the leafy prairie clover and Butler's quillwort - have been discovered on the property...management activities." The Butler's quillwort, or Isoetes butleri, is designated...
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 "Cape Argus (South Africa)")
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Namaqua pool offers elusive surprise; Botanic researchers find rare quillworts.(News)
Newspaper article from: Cape Argus (South Africa); 5/19/2009; 700+ words
; ...instantly recognisable as a type of quillwort. However, a closer look told them the...pools - such as the gnamma where this new quillwort was found - are vulnerable to climate...occurred frequently. "Perhaps the new quillwort is one such survivor, and perhaps there...
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North Carolina
Magazine article from: Castanea; 6/1/2002; ; 700+ words
; ...by Brunton et al. (1996), I. virginica is a tetraploid quillwort of intermittent woodland streams and low, wet wooded areas...Reference] BRUNTON, D.F. and D.M. BRITON. 1999. Rush quillwort (Isoetes junciformis, sp. nov.), a new pteridophyte...
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Foreign invader threatens loch
Newspaper article from: The Scotsman; 5/13/2002; ; 700+ words
; ...more food to grow. Miss Macleod added: "Some of the loch's native aquatic plants, like water lobelia, shoreweed and quillwort, are quite small, rooted plants that grow on the bottom and display a compact, rosette growth form. It is these native...
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Warm welcome
Magazine article from: Natural History; 3/1/2001; ; 700+ words
; ...apparently having served as a feeding platform just above the water level. It held a single scrap of food: a frozen aquatic quillwort, still whole and green. The main nest chamber, roomy enough to permit us to raise our heads and pass a camera back and...
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 "Albany Times Union (Albany, NY)")
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ENVIRONMENTAL LAW IS STILL A LANDMARK.(MAIN)
Newspaper article from: Albany Times Union (Albany, NY); 12/27/1998; 700+ words
; ...and the feared alligator. Few realized it also would protect the snail darter, kangaroo rat, Delhi fly, black-spored quillwort and the much-maligned furbish lousewort (a flowering plant in Maine). When Nixon signed the bill, there were 109 species...
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Findings from University of Bonn provide new insights into nucleic acids research.
Newspaper article from: Health & Medicine Week; 11/16/2009; 700+ words
; ...more evolutionary plasticity than those of animals. We analysed the first mitochondrial DNA (mtDNA) of a lycophyte, the quillwort Isoetes engelmannii, which is separated from seed plants by more than 350 million years of evolution." "The Isoetes mtDNA...
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Ozark Mushrooms
Magazine article from: Natural History; 2/1/2007; ; 700+ words
; ...substantial wetlands along streams and around ponds. Such cliff-top depressions are also the exclusive home for limestone quillwort, a spore-producing species related to the ferns. It's a plant you would have to search out between mid-March and mid...
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quillwort
Book article from: The Columbia Encyclopedia, Sixth Edition
quillwort common name for several species of the plant genus Isoetes, which grow in ponds, slow streams, and swampy places. See Lycopodiophyta .
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Lycopodiidae
Encyclopedia entry from: The Gale Encyclopedia of Science
...distributed on all continents, most commonly growing on the bottom of freshwater lakes and other surface waters. A representative species is Braun ’ s quillwort ( Isoetes braunii ) of boreal North America and Eurasia. Bill Freedman
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