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    Ecoso exchange newsletter 2/1; Dec. 1988

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    Contents in this issue: The Ecoso Exchange Story So Far, pg. 1 Ecoso Exchange Newsletter is Now Being Revived, pg. 2 Globalisation of Trade and Planning Education, pg. 3 Ideas on Sustainable Societies, pg. 5 The Rainbow Alliance, pg. 5 The New Left Party, pg. 6 Greenhouse 88, pg. 7 Metropolis 90, pg. 8 Nightmares or Dreams of the Future, pg. 9 The Multi-functional Polis, pg. 9 The Very Fast Train (VFT), pg. 9 B-Double Super Trucks, pg. 9 Links All Around Australia, pg. 10

    Iowa Workforce Monthly, November 2010, Issue 19

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    Highlights: * New Iowan Center 10th Anniversary Open House........................................pg. 2 * New ICAP Workforce Services Center Held Open House.............................pg. 2 * Cedar Rapids IowaWORKS Hosts Career Fair...............................................pg. 3 * New Hours for Washington IowaWORKS office.............................pg. 3 * Regional Update.................................pg. 4 * Regional Veteran’s Day Events & Photos ...............................................pg.

    Metabolism of amino acid amides in Pseudomonas putida ATCC 12633

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    The metabolism of the natural amino acid L-valine, the unnatural amino acids D-valine, and D-, L-phenylglycine (D-, L-PG), and the unnatural amino acid amides D-, L-phenylglycine amide (D, L-PG-NH2) and L-valine amide (L-Val-NH2) was studied in Pseudomonas putida ATCC 12633. The organism possessed constitutive L-amidase activities towards L-PG-NH2 and L-Val-NH2, both following the same pattern of expression, suggesting the involvement of similarly regulated enzymes, or a common enzyme. Quite surprisingly, growth in mineral media with L-PG-NH2 resulted in variable, long lag phases of growth and strongly reduced L-amidase activities. Conversion of D-PG-NH2 into D-PG and L-PG also occurred and could be attributed to the presence of an inducible D-amidase and the racemization of the amino acid amide in combination with L-amidase activity, respectively. The further degradation of L-PG and D-PG involved constitutive L-PG aminotransferase and inducible D-PG dehydrogenase activities, respectively, both with a high degree of enantioselectivity. Amino acid racemase activity for D- and L-PG was not detected.

    Transitive and Co-Transitive Caps

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    A cap in PG(r,q) is a set of points, no three of which are collinear. A cap is said to be transitive if its automorphism group in PGammaL(r+1,q) acts transtively on the cap, and co-transitive if the automorphism group acts transtively on the cap's complement in PG(r,q). Transitive, co-transitive caps are characterized as being one of: an elliptic quadric in PG(3,q); a Suzuki-Tits ovoid in PG(3,q); a hyperoval in PG(2,4); a cap of size 11 in PG(4,3); the complement of a hyperplane in PG(r,2); or a union of Singer orbits in PG(r,q) whose automorphism group comes from a subgroup of GammaL(1,q^{r+1}).Comment: To appear in The Bulletin of the Belgian Mathematical Society - Simon Stevi

    A characterization of Hermitian varieties as codewords

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    It is known that the Hermitian varieties are codewords in the code defined by the points and hyperplanes of the projective spaces PG(r,q2)PG(r,q^2). In finite geometry, also quasi-Hermitian varieties are defined. These are sets of points of PG(r,q2)PG(r,q^2) of the same size as a non-singular Hermitian variety of PG(r,q2)PG(r,q^2), having the same intersection sizes with the hyperplanes of PG(r,q2)PG(r,q^2). In the planar case, this reduces to the definition of a unital. A famous result of Blokhuis, Brouwer, and Wilbrink states that every unital in the code of the points and lines of PG(2,q2)PG(2,q^2) is a Hermitian curve. We prove a similar result for the quasi-Hermitian varieties in PG(3,q2)PG(3,q^2), q=phq=p^{h}, as well as in PG(r,q2)PG(r,q^2), q=pq=p prime, or q=p2q=p^2, pp prime, and r≥4r\geq 4
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