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Selection and characterization of a rice mutant resistant to 5-methyltryptophan (1991)

Lee, H. Y. ; Kameya, T.

Springer

Theoretical and applied genetics 82 (1991), S. 405-408

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ISSN: 1432-2242

Keywords: Ethylene imine ; Dominant gene ; Free amino acids ; 5-methyltryptophan resistance ; Rice mutant

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary A rice plant resistant to 5-methyltryptophan (5MT) was selected from mutagenized M3 seeds (Oryza sativa L. var. Sasanishiki) originating from panicles treated with ethylene imine (0.2%) 2 h after flowering. When germinated on 5MT-containing medium, the seeds (M4) from selfed plants segregated with a 3 resistant:1 sensitive ratio, indicating that the plant was heterozygous for a resistance gene and that the resistance was dominant. The resistance was also expressed in callus derived from seeds. Analysis of the free amino acids in seeds, seedlings, and calli showed that homozygous resistant plants (TR1) contained higher levels of total free amino acids than sensitive plants. In particular the levels of tryptophan, phenylalanine, and histidine were, respectively, 8.5, 5.4, and 4.9 times higher than those in the sensitive plants.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00588590

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Copolymerization of a polyhydrocarbon macromonomer with methyl acrylate and acrylonitrile in the presence of a lewis acid (1994)

Lee, H.-Y. ; Herman, M. S. ; Padias, A. B. ; [et al.]

Weinheim : Wiley-Blackwell

Acta Polymerica 45 (1994), S. 413-418

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ISSN: 0323-7648

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Notes: The free radical copolymerization of a vinyl-terminated hydrocarbon macromonomer, namely poly-l-butene with molecular weight 1,000, with methyl acrylate (MA) led to copolymers with broad molecular weight distributions, and even bimodal character. In the presence of alkylaluminum chloride Lewis acids, higher incorporation of MA was obtained. The polymer MW and mole% MA in the copolymer increase with their decreasing Lewis acid strength. The best result was obtained in the presence of 25 mole% Et2AlCl versus MA at 60°C which led to 82% of the polyhydrocarbon chains being derivatized and unimodal MW distribution. For the copolymerization of the polyhydrocarbon macromonomer and AN, the best results were obtained without Lewis acid in toluene using a free radical initiator at 125°C. The model compound 2,2,4-trimethyl-1-pentene copolymerizes with both MA and AN in standard free radical conditions and the copolymerization parameters were determined.

Additional Material: 2 Ill.