Abstract: A bacterium belonging to the genus Escherichia which has an ability to produce an L-amino acid, wherein the ability to produce the L-amino acid is increased by increasing expression of an L-amino acid excretion protein is described. A method for producing the L-amino acid using the bacterium is also described.

Abstract: A bacterium belonging to the genus Escherichia which has an ability to produce an L-amino acid, wherein the ability to produce the L-amino acid is increased by increasing expression of an L-amino acid excretion protein is described. A method for producing the L-amino acid using the bacterium is also described.

Abstract: A bacterium which has an ability to produce an amino acid and in which a novel rhtB gene encodes a protein having an activity of making a bacterium having the protein L-homoserine-resistant is enhanced, is cultivated in a culture medium to produce and cause accumulation of the amino acid in the medium, and the amino acid is recovered from the medium.

Abstract: A bacterium which has an ability to produce an amino acid and in which a novel rhtB gene encodes a protein having an activity of making a bacterium having the protein L-homoserine-resistant is enhanced, is cultivated in a culture medium to produce and cause accumulation of the amino acid in the medium, and the amino acid is recovered from the medium.

Abstract: The present invention describes a bacterium which has an ability to produce an amino acid and in which the rhtC gene encoding a protein having an enhanced activity of imparting L-threonine resistance to a bacterium expressing the protein. Preferably, the bacterium further includes an rhtB gene encoding for a protein having an enhanced activity of imparting to a bacterium L-homoserine resistance expressing the protein. The present invention also describes a method of cultivating the bacterium in a culture medium to produce and accumulate amino acids in the medium, and the amino acid is recovered from the medium.

Abstract: A bacterium belonging to the genus Escherichia which has an ability to produce an L-amino acid, wherein the ability to produce the L-amino acid is increased by increasing expression of an L-amino acid excretion protein is described. A method for producing the L-amino acid using the bacterium is also described.

Abstract: The method resides in profiling a part of a cylindrical pipe by drawing it through a moulding device, and reducing the pipe over its entire length for the diameter of the cylindrical part of the pipe to be substantially equal to the diameter of the circumscribed circle of its profiled part.The apparatus for performing the method comprises a drawing bench supporting a drawing die (2) accommodated in a housing (1) and a drawing carriage. Cams (6) are situated in front of the drawing die (2) at both sides of the path of the travel of a pipe (5) being manufactured, their one ends carrying deforming rollers (7) and their other ends carrying forked levers (8) cooperating with the drawing carriage through a tie (11) with slots (10) receiving therein lock pins (9) adapted to engage the forked levers (8). The apparatus further includes a pivoted lever (29) with a bearing roller (31), mounted on the housing (1).

Abstract: A piezoceramic material comprising PbTiO.sub.3, PbZrO.sub.3, PbB'.sub.1-.alpha. B".sub..alpha. O.sub.3, and PbB'".sub.1-.alpha. B.sub..alpha..sup.IV O.sub.3, wherein B' is selected from the group consisting of Nb.sup.5+, W.sup.6+ ; B" is selected from the group consisting of Zn.sup.2+, Mg.sup.2+, Co.sup.2+, Mn.sup.2+, Ni.sup.2+ ; B'" is selected from the group consisting of Nb.sup.5+, W.sup.6+ ; B.sup.IV is selected from the group consisting of Zn.sup.2+, Mg.sup.2+, Co.sup.2+, Ni.sup.2+ ; .alpha.=1/2 for W.sup.6+ and 1/3 for Nb.sup.5+, with B' and B"' being equal to Nb.sup.5+, and B" being equal to Ni.sup.2+, B.sup.IV is neither equal to Zn.sup.2+ nor to Mn.sup.2+ ; with B' and B'" being equal to Nb.sup.5+, B" being equal to Mg.sup.2+, B.sup.IV is not equal to Mn.sup.2+, and the content of the above components being as follows, molar percent:______________________________________ PbTiO.sub.3 30.0 to 52.5 PbB.sub.1-.alpha. ' B.sub..alpha. "O.sub.3 1.5 to 28.4 PbZrO.sub.3 25.0 to 47.6 PbB.sub.1-.alpha. '" B.