TECHNOLOGY FOCUS - BIOLOGY - Preferred Method: The method further comprises: isolating the fatty acid derivative; and culturing the host cell in the presence of an alcohol. The gene encoding an ester synthase is obtained from Acinetobacter sp., Alcanivorax borkumensis, Alcaligenes eutrophus, Mortierella alpina, Cryptococcus curvatus, Arabidopsis thaliana, Fundibacter jadensis, Pseudomonas aeruginosa, Rhodococcus opacus, Marinobacter hydrocarbonoclastics, Saccharomyces cerevisiae, Homo sapiens, or Simmondsia chinensis. The host cell is genetically engineered to express, relative to a wild type host cell, a decreased level of at least one of a gene encoding an acyl-CoA dehydrogenase, a gene encoding an outer membrane protein receptor, and a gene encoding a transcriptional regulator of fatty acid biosynthesis. The host cell is genetically engineered to express, relative to a wild type host cell, a decreased level of a gene encoding a pyruvate formate lyase, and/or a lactate dehydrogenase. The microorganism is genetically engineered to express, relative to a wild type microorganism, a decreased level of at least one of a gene encoding an acyl-CoA dehydrogenase, a gene encoding an outer membrane protein receptor, and a gene encoding a transcriptional regulator of fatty acid biosynthesis. The microorganism is genetically engineered to express, relative to a wild type microorganism, a decreased level of at least one of a gene encoding a pyruvate formate lyase, and a gene encoding a lactate dehydrogenase. The gene encoding the outer membrane protein receptor encodes a ferrichrome outer membrane transporter. The gene encoding the transcriptional regulator encodes a DNA binding transcriptional repressor. Preferred Components: The gene encoding a thioesterase is tesA, tesA, fatB, fatB2, fatB3, fatAl, or fatA. The gene encoding an acyl-CoA synthase is fadD, fadK, BH3103, pfl-4354, EAV15023, fadD1, fadD2, RPC4074, fadDD, faa39, where the gene that encodes the protein of GenBank Accession No. ZP01644875, or yhfL. The gene encoding an ester synthase is wax/dgat, a gene encoding a wax synthase, a gene encoding a bifunctional ester synthase/acyl-CoA:diacylglycerol acyltransferase, ES9, ES8, DSM 8798, or AtfA2. The gene encoding outer membrane protein receptor is a gene encoding an outer membrane ferrichrome transporter. The gene encoding the transcriptional regulator of fatty acid biosynthesis encodes a DNA transcriptional repressor. The host cell is a mammalian cell, plant cell, insect cell, yeast cell, fungus cell, filamentous fungi cell, cyanobacterial cell, and bacterial cell. The host cell is an E. coli cell. The exogenous control sequence is a promoter. The genetically engineered microorganism comprises a gram-negative or a gram-positive bacterium.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The composition has: a cloud point of 5 degrees C or lower, 0 degrees C or lower, or -4 degrees C or lower; a simulated distillation T90 of 360 degrees C or lower, or 358 degrees C or lower; a sulfur content of 15 ppm or less, 12 ppm or less, or 10.7 ppm or less; a Karl Fischer moisture content of 0.1 wt.% or less, 0.08 wt.% or less, or 0.06 wt.% or less; a total acid number of 0.50 mg potassium hydroxide (KOH)/g or less, 0.20 mg KOH/g or less, or 0.15 mg KOH/g or less; a combined calcium and magnesium content of 5 ppm or less, 2 ppm or less, or 0.5 ppm or less; a combined sodium and potassium content of 5 ppm or less, 2.5 ppm or less, or 1.6 ppm or less; a specific mass at 20 degrees C of 850-900 kg/m3, 860-890 kg/m3, or 870-880 kg/m3; a kinematic viscosity at 40 degrees C of 3-6 mm2/s, 3.2-5 mm2/second, or 3.5-4 mm2/s; a water content of 500 mg/kg or less, 480 mg/kg or less, or 450 mg/kg or less; a total contamination level of 24 mg/kg or less, 20 mg/kg or less, 10 mg/kg or less, or 5 mg/kg or less; a flash point of 100 degrees C or higher, 110 degrees C or higher, or 120 degrees C or higher; an ester content of 96.5 wt.% or more, or 97 wt.% or more; a carbon residue number of 0.05 wt.% or less; a sulfated ash level of 0.02 wt.% or less, or 0.01 wt.% or less; a phosphorus level of 10 mg/kg or less, 5 mg/kg or less, or 1 mg/kg or less; a copper corrosion score of 1; a cold filter plugging point of 19 degrees C or lower, 10 degrees C or lower, or 0 degrees C or lower; a free glycerol level of 0.02 wt.% or less; a total glycerol level of 0.25 wt.% or less, 0.15 wt.% or less, 0.10 wt.% or less, or 0.05 wt.% or less; a monoacylglycerol level of 0.02 wt.% or less; a methanol or ethanol level of 0.2 wt.% or less, 0.1 wt.% or less, or 0.02 wt.% or less; an iodine number of 65 g/100 g or less; and an oxidation stability at 110 degrees C of 6 hours or longer, 9 hours or longer, or 11 hours or longer. EXAMPLE - No suitable example given.