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The aim of this research was to investigate the influence of deproteinated potato wastewater (DPW) supplemented by different initial concentrations of glucose on biomass yield, especially lipids biosynthesis and fatty acids composition. DPW is a low-cost source of nitrogen and other biogenic elements. It allowed for an efficient yeast cells growth and a very high biomass yield of Rhodotorula glutinis var. rubescens LOCKR13. A short time of incubation leads to a biomass rich in protein, which can be a source of single-cell protein. The strain was able to accumulate 46% cell dry weight (CDW) of lipids in control medium and only 18% when DPW medium were used. The maximum volumetric lipids efficiency in the DPW medium was 6.14 g L−1. Oleic (41.0–51.5%), palmitic (15.3–17.8%), and stearic acids (5.8–7.5%) dominated the entire pool of fatty acids. Theoretical calculations indicated a possibility to use the methylated esters of lipids from R. glutinis var. rubescens yeast as a biodiesel. [ABSTRACT FROM AUTHOR]

A 12-week feeding experiment was conducted to investigate the effects of dietary fatty acids composition on growth performance, lipid deposition and some genes expression of hepatic lipid metabolism in juvenile turbot ( Scophthalmus maximus L.) (mean initial body weight, 9.49 ± 0.03 g) fed diets with required n3 LC-PUFA. Juvenile turbot were fed diets with palm oil (PO), rapeseed oil (RO), soybean oil (SO) or linseed oil (LO) replacing the same levels of fish oil (FO), respectively. Each diet was randomly fed to triplicate tanks, and each tank was stocked with 35 fish. The results showed that growth performance and feed utilization of turbot fed diets with required n3 LC-PUFA were independent of dietary fatty acids composition. As expected, C16:0, C18:1n, C18:2n-6, C18:3n-3 and n3 LC-PUFAs level in liver were up to the maximum in the PO, RO, SO, LO and FO group, respectively, and significantly higher than that in the other groups ( P < 0.05). Fish fed the diet with RO had the lowest plasma triglyceride and the highest HDL-c/LDL-c, although no significant difference of plasma triglyceride had been found between the RO group and the LO group. Hepatic lipid content in fish fed diets with SO, RO, and LO was significantly higher compared with PO and FO groups. The higher activities of hepatic G6PD and ME were found in fish fed diets with PO or FO compared to LO. The relative expression of LPL , LXR , and ApoB-100 gene in the RO group and the LO group, MTP gene in the LO group, PPARα and FAS genes in the PO group, and PPARγ gene in the SO group were significantly higher than those in the FO group. These results indicated that the increase in hepatic lipid deposition of turbot induced by the SO, RO, and LO diets are associated with up-regulation of some genes involved in lipids biosynthesis metabolism. [ABSTRACT FROM AUTHOR]