(n.) A genus (Lemna) of small plants, seen floating in great quantity on the surface of stagnant pools fresh water, and supposed to furnish food for ducks; -- called also duckmeat.
Example Sentences:
(1) Duckweed commonly refers to a group of floating, flowering plants of the family Lemnaceae.
(2) Evidence for the sequence of duckweed (Lemna minor) chloroplast 5S rRNA was derived from the analysis of partial and complete enzymic digests of the 32P-labelled molecule.
(3) Growth inhibition of duckweed could be achieved at approx 20 ppb terbutryne in steady state.
(4) The period of the circadian rhythm of uptake of K+ by Lemna gibba strain G3 (duckweed), cultured in a flow medium, was shortened by continuous application of 0.5 mM tetraethylammonium chloride (TEA), which functions as a K+ channel blocker in both animal and plant cells.
(5) Spirodela (Duckweed) was thus used to ascertain the response of the nucleocytoplasmic (nc) and plastid ribosomal RNA metabolisms to partial and total carbon deprivation.
(6) The possible sequence of the chloroplast 5S rRNA from three other flowering plants was deduced by complete digestion with T1 ribonuclease and comparison of the sequences of the oligonucleotide products with homologous sequences in the duckweed 5S rRNA.
(7) Many duckweed species have been studied, primarily of the Lemna and Spirodela genera.
(8) Radioactivity from d-[l-(14)C]glucosamine is incorporated into ethanol-insoluble compounds of high molecular weight in a number of plant tissues, including roots of corn (Zea mays), callus cells of sycamore (Acer pseudoplatanus), axenic cultures of duckweed (Lemna minor) and germinating seedlings of corn, broad bean (Vicia faba) and barley (Hordeum vulgare).
(9) Duckweed and algae represent different levels of complexity in the plant kingdom.
(10) Values for the half-life of Lemna minor (duckweed) protein determined by the new method are compared with values obtained by other methods.
(11) Herbicidal effectiveness of terbutryne-EVA formulation has been investigated in a laboratory-scale simulated flow system device with duckweed plants (Lemna minor) as test organism.
(12) Thus the specific activity of the duckweed enzyme is more than two orders of magnitude higher than that of the enzyme from rat testes.
(13) In the short, single-screen film Lock Again, there is a marvellous sequence in which two young men in sailor's uniforms - both of whom look as if they have been in a fight - ferry an imperious girl across a pond thick with duckweed in a rowing boat.
(14) A new method is described for measuring environmental stress through the use of the duckweed (Lemna minor) rhizosphere.
(15) Differences in duckweed test methodology occur with regard to test types, test vessels, control tests, nutrient media, end points, and applications.
(16) Other studies, however, indicate that duckweed plants are as sensitive to toxicity as other aquatic species.
(17) Duckweed (Spirodela oligorrhiza, Kurz) is a sensitive indicator of 1,1'-alkyl-4,4'-bipyridylium salt (viologen) herbicidal potency.
(18) Duckweed plants are fast growing and widely distributed.
(19) Orellanine, a toxic principle of Cortinarius orellanus Fr., efficiently inhibited the photosynthetic activity of duckweed, Lemna minor L., at a concentration of 0.4 mM.
(20) The present paper deals with the separation of cells from soluble compounds of blood by means of exclusion chromatography using a recently described vesicular packing material made from the cell wall framework of the small duckweed Wolffia arrhiza.
Weed
Definition:
(n.) A garment; clothing; especially, an upper or outer garment.
(n.) An article of dress worn in token of grief; a mourning garment or badge; as, he wore a weed on his hat; especially, in the plural, mourning garb, as of a woman; as, a widow's weeds.
(n.) A sudden illness or relapse, often attended with fever, which attacks women in childbed.
(n.) Underbrush; low shrubs.
(n.) Any plant growing in cultivated ground to the injury of the crop or desired vegetation, or to the disfigurement of the place; an unsightly, useless, or injurious plant.
(n.) Fig.: Something unprofitable or troublesome; anything useless.
(n.) An animal unfit to breed from.
(n.) Tobacco, or a cigar.
(v. t.) To free from noxious plants; to clear of weeds; as, to weed corn or onions; to weed a garden.
(v. t.) To take away, as noxious plants; to remove, as something hurtful; to extirpate.
(v. t.) To free from anything hurtful or offensive.
(v. t.) To reject as unfit for breeding purposes.
Example Sentences:
(1) Careless Herbicidal aerial spray of a field for weed control and defoliation of cotton before machine picking, resulted in the contamination of an adjoining reservoir, killing large volume of fish.
(2) In lieu of crop rotation and biodiversity (the non-toxic way to control weeds), the MSU extension service promotes what the article calls a "diversified herbicide program".
(3) The condition has occurred for many years and has been thought to have been associated with ingestion of Crofton weed (Eupatorium adenophorum).
(4) There is, of course, a place for regulatory vigilance, for forcing entire institutions to clean up after themselves by paying hefty fines, and weeding out bad practices.
(5) In allergologic out-patient departments of Dubrovnik, Split, Sibenik, Zadar, Pula and Rijeka, 300 patients with pollinosis have been tested by the application of the prick method of group allergens of grass, tree and weed pollen, particularly of Parietariae (pellitory) pollen.
(6) The coalition claims that authorities were forcing teachers, businessmen and students to weed the fields or pick cotton or face fines of up to 1 million soum (about £210) for university students.
(7) Bob McCulloch, the St Louis County prosecutor who oversaw the state grand jury inquiry that looked into Brown’s death, insisted that discrimination by law enforcement was a rarity but said authorities must “weed it out”.
(8) Unions blame 70% fall in employment tribunal cases on fees Read more “The government originally said making people pay would weed out vexatious claims.
(9) He also promised Thatcher a new crackdown on immigrant male fiances, saying that he was thinking of "a kind of steeplechase designed to weed out south Asians in particular".
(10) The substances studied generally proved very active against the weeds tested and showed marked specificity of action towards Setaria and Echinochloa.
(11) We haven’t ascertained how much of the forests it has taken over, but a significant portion may in reality be unpalatable weeds and effectively unusable from an elephant’s perspective.
(12) In a statement on Wednesday , he said that he will criticise the Met for "the routine gathering and retention of information that was collateral, not linked to an operation or the prevention of crime and it should have been disposed of as part of a weeding process."
(13) But the matriarch of women who toke is Nancy Botwin ( Mary-Louise Parker ) in the long-running TV series Weeds .
(14) One of their number, James Howard Kunstler, blasted the High Line as "decadent" , "a weed-filled 1.5 mile-long stretch of abandoned elevated railroad", where "mistakes are artfully multiplied and layered", such as "the notion that buildings don't have to relate to the street-and-block grid ... instead of repairing the discontinuities of recent decades, we just celebrate them and make them worse".
(15) We have the know-how to track organisations that achieve the best results for patients, and weed out those that don't come up to scratch."
(16) After weeding, planting or harvesting, people attempt to make money.
(17) Animal Practice is a Universal Television production based on an irreverent New York veterinarian, played by Justin Kirk of Weeds and Angels in America.
(18) Some physicochemical properties of the mitochondrial DNAs (mtDNA) from plants of flax, broad bean and mung bean, and from tissue culture cells of jimson weed, soybean, petunia and tobacco were determined.
(19) Weed and water samples collected from river water abstraction points, reservoirs, tap water supplies, and animal water troughs fed from this supply all contained low levels of iodine-125.
(20) There has been a troubling several decade-long pattern of denial on the part of the seed patent holders over the likelihood of resistance emerging - for example Monsanto authors of a 1997 paper asserted weed resistance would never happen.