Abstract: There is provided a 3-(3-aryloxyphenyl)-1-(substituted methyl)-s-triazine-2,4,6-oxo or thiotrione compound having the structural formula I ##STR1## Further provided are a composition and a method comprising that compound for the control of undesirable plant species.

Abstract: A noise reduction apparatus and method for enhancing noisy speech signal which applies to the spectral component signals of a time-varying input signal either a spectral substraction process or a spectral scaling process followed by signal attenuation in regions of the frequency spectrum lying between identified formant regions.

Abstract: There is provided a 1-(3-heterocyclylphenyl)-s-triazine-2, 4,6-oxo or thiotrione compound having the structural formula I ##STR1## Further provided are a composition and a method comprising that compound for the control of undesirable plant species.

Abstract: Plant cells are transformed by:(i) transforming a plant cell whose growth is sensitive to inhibition by a sulfonamide or a salt thereof with a chimaeric gene comprising (a) a plant promoter, (b) a sulfonamide resistance gene having a sequence encoding a transit peptide fused to the 5'-end of the resistance gene and (c) a plant polyadenylation/terminator sequence;(ii) selecting a transformed plant cell whose growth is resistant to inhibition by a sulfonamide or salt thereof;(iii) optionally, regenerating from the transformed plant cell a genetically transformed plant which exhibit the said resistance;(iv) optionally, obtaining seed from the regenerated plant; and(v) optionally, propagating plants from the seed.The growth of weeds can be controlled at a locus where a transgenic plant obtained as above is being cultivated by applying to the locus an effective amount of a herbicide, such as asulam, which acts by inhibiting dihydropteroate synthase.

Abstract: There is provided a 1-(3-heterocyclylphenyl)-s-triazine-2,4,6-oxo or thiotrione compound having the structural formula I ##STR1## Further provided are a composition and a method comprising that compound for the control of undesirable plant species.

Abstract: There is provided a 3-(3-aryloxyphenyl)-1-(substituted methyl)-s-triazine-2,4,6-oxo or thiotrione compound having the structural formula I ##STR1## Further provided are a composition and a method comprising that compound for the control of undesirable plant species.

Abstract: There is provided a 3-(3-aryloxyphenyl)-1-(substituted methyl)-s-triazine-2,4,6-oxo or thiotrione compound having the structural formula I ##STR1## Further provided are a composition and a method comprising that compound for the control of undesirable plant species.

Abstract: The present invention provides 1-{[2-(cyclopropylcarbonyl)-4-fluorophenyl]sulfamoyl}-3-(4,6-dimethoxy-2-p yrimidinyl) urea which has the structural formula I ##STR1## Further provided-are compositions and methods comprising that compound for the control of undesirable plant species.