TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preparation: No preparation method given. Preferred Cell: The oleaginous bacterial cell further comprises genes encoding cellobiose sugar transporters. The cell belongs to genus Rhodococcus, preferably species Rhodococcus opacus. The oleaginous bacterial cell has been modified for the lipid production. The oleaginous bacterial cell comprises a gene encoding cellobiase activity operably linked to a suitable promoter sequence have been introduced into Rhodococcus opacus PD630 cell. Preferred Components: The endocellulase activity is selected from endoglucanases, beta-glucanases, and xylanases; enzymes belonging to class EC 3.2.1.4, EC 3.2.1.6 and EC 3.2.1.8; and/or a polypeptide comprising an amino acid sequence having at least 70% identity to polypeptide having (SEQ ID NO: 1) (CenA), (SEQ ID NO: 3) (CenB), (SEQ ID NO: 5) (CenC) or (SEQ ID NO: 11) (Cel6A); or a polypeptide encoded by a nucleotide having (SEQ ID NO: 2) (cenA), (SEQ ID NO: 4) (cenB), (SEQ ID NO: 6) (cenC) or (SEQ ID NO: 12) (as available on WIPO website. Sequences not defined here may be found at ftp://ftp.wipo.net/pub/published pct sequences/publication) (cel6A) or its complementary strand. The exocellulase activity is selected from cellulose 1,4- beta -cellobiosidases and 1,4-beta-glucan cellobiohydrolases; enzymes belonging to class EC 3.2.1.91 or EC 3.2.1.74; and/or a polypeptide comprising an amino acid sequence having at least 70% identity to polypeptide having (SEQ ID NO: 9) (Cex) or (SEQ ID NO: 7) (CbhA); or a polypeptide encoded by a nucleotide having (SEQ ID NO: 10)(cex) or (SEQ ID NO: 8) (cbhA) or its complementary strand. The cellobiase activity is selected from cellobiases, beta-glucosidases and beta-galactosidases; enzyme belonging to class EC 3.2.1.21; and/or a polypeptide (having cellulolytic activity) comprising an amino acid sequence having at least 70% identity to polypeptide having (SEQ ID NO: 17) (BglC); or a polypeptide encoded by a nucleotide having (SEQ ID NO: 18) (bglC) or its complementary strand. Preferred Method: In the method (M1), the bacterial strain secreting cellulolytic activity in step (b) and the oleaginous strain of step (d) are cultivated sequentially or simultaneously in the same culturing medium; the bacterial strain secreting cellulolytic activity in step (b) secretes endoglucanase and exoglucanase activities and oleaginous cell according to step (e) expresses cellobiase activity; the oleaginous strain according to step (e) further expresses transporter(s) for cellobiose intake; the bacterial strain secreting cellulolytic activity in step (b) is the oleaginous cell of step (d); at least 10%, preferably 30% of the carbon source is in cellulosic form; and the carbon source is pretreated cellulose. EXAMPLE - No suitable example given.