Abstract:
Novel strains of isolated and purified bacteria have been identified which have the ability to degrade petroleum hydrocarbons including a variety of PAHs. Several isolates also exhibit the ability to produce a biosurfactant. The combination of the biosurfactant-producing ability along with the ability to degrade PAHs enhances the efficiency with which PAHs may be degraded. Additionally, the biosurfactant also provides an additional ability to bind heavy metal ions for removal from a soil or aquatic environment.
Abstract:
The invention relates to nucleic acid sequences which code for a polypeptide having nitrilase activity, to nucleic acid constructs comprising the nucleic acid sequences, and to vectors comprising the nucleic acid sequences or the nucleic acid constructs. The invention further relates to amino acid sequences which are encoded by the nucleic acid sequences, and to microorganisms comprising the nucleic acid sequences, the nucleic acid constructs or vectors comprising the nucleic acid sequences or the nucleic acid constructs.The invention additionally relates to a process for preparing chiral carboxylic acids from the racemic nitriles.
Abstract:
Novel proteins of Flavobacterium sp. R1534 and the DNA sequences which encode these proteins are disclosed which provide an improved biosynthetic pathway from farnesyl pyrophosphate and isopentyl pyrophosphate to various carotenoid precursors and carotenoids, especially .beta.-carotene, lycopene, zeaxanthin and cantaxanthin.
Abstract:
The present invention relates to a polyester synthase gene coding for a polypeptide containing the amino acid sequence of SEQ ID NO:2 or a sequence where in the amino acid sequence of SEQ ID NO:2, one or more amino acids are deleted, replaced or added, the polypeptide bringing about polyester synthase activity; a gene expression cassette comprising the polyester synthase gene and either of open reading frames located upstream and downstream of the gene; a recombinant vector comprising the gene expression cassette; a transformant transformed with the recombinant vector; and a process for producing polyester by culturing the transformant in a medium and recovering polyester from the resulting culture.
Abstract translation:本发明涉及编码含有SEQ ID NO:2的氨基酸序列的多肽的聚酯合成酶基因,或其中在SEQ ID NO:2的氨基酸序列中缺失一个或多个氨基酸,替换或 多肽引起聚酯合酶活性; 一种基因表达盒,其包含聚合酶合酶基因和位于该基因上游和下游的开放阅读框; 包含该基因表达盒的重组载体; 用重组载体转化的转化体; 以及通过在培养基中培养转化体并从所得培养物中回收聚酯来生产聚酯的方法。
Abstract:
L-tertiary-Leucine and L-phosphinothricine are obtainable by transamination of the corresponding keto acids as a precursor in the presence of amino acids as amino group donors. The reaction is preferably carried out with microorganisms or their transaminases.
Abstract:
A process for producing poly-3-hydroxyalkanoate (PHA) by culturing Alcaligenes on a low water-solubility aliphatic carboxylic acid and, or hydrolysable derivative of low solubility in pure water, by fermenting the organism in a growth step on a nutrient medium containing inter alia phosphorus in a quantity corresponding to the intended quantity of bacterial cells to be grown until cell growth stops or slows substantially, then in a PHA accumulation stage fermenting the grown cells by feeding said low-solubility carbon source while monitoring pH and adjusting it by addition of ammonia and/or alkaline alkali metal compound until a design quantity of PHA has been produced, and recovering PHA from the product. Further phosphorus may be fed to the accumulation stage at a rate sufficient to permit some bacterial growth but insufficient to permit growth to the exclusion of PHA accumulation. The over-all carbon (as C) to phosphorus (as P) weight ratio is typically in the range 40-100 in the growth stage and 300 to 600 in the accumulation stage.
Abstract:
An enzyme is provided which has acylase activity capable of hydrolyzing N-acetyl-(R,S)-pipecolic acid stereoselectively to give (S)-pipecolic acid, wherein this activity is greater than that on N-acetyl-S-proline, at pH 7.5, 25.degree. C., and substrate concentration 20 g/l, in 75 mM Tris buffer. The enzyme is obtainable from the species of Alcaligenes denitrificans deposited as NCIMB 40587. A microorganism having therein the enzyme also is provided, as is a process for preparing (S)-pipecolic acid comprising contacting a mixture of enantiomers of an N-acyl-pipe colic acid with the enzyme or microorganism.
Abstract:
The transesterification method is conducted with a powdery lipase wherein the powdery lipase is dispersed in ester-containing starting materials in the presence or absence of an inert organic solvent, and the diameter of at least 90% of the dispersed lipase particles is kept in the range of 1 to 100 .mu.m in the course of the trans-esterification reaction. A reactivity higher than that realized by the conventional transesterification method with a powdery lipase is obtained and the lipase can be easily recovered and reused, without causing a loss of the lipase activity, lowering of the conversion due to the residence of the substrate on the immobilizing carrier and side reactions caused by water introduced into the reaction system by the immobilizing carrier.
Abstract:
A process for enantioselectively converting an aldehyde, a bisulfite adduct of an aldehyde or a glycidate to a chiral carboxylic acid is disclosed. The process utilizes a microorganism or an enzyme preparation from a microorganism and is particularly useful for producing NSAIDs of the profen class from readily available precursors. Preferred microorganisms are Gram-negative rod bacteria.
Abstract:
A random copolymer comprising, as repeating units,(i) 20 to 90 mol % of 3-hydroxybutyrate unit (3HB) having the formula (I): ##STR1## (ii) 5 to 70 mol % of 3-hydroxyvalerate unit (3HV) having the formula (II): ##STR2## and (iii) 1 to 15 mol % of 4-hydroxyvalerate unit (4HV) having the formula (III): ##STR3## wherein the total of the units 3HB, 3HV, and 4HV is 100 mol %, and having a weight average molecular weight within the range of from 10,000 to 2,500,000 and a production process thereof.