geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Properties of the docosahexaenoic acid-producer Schizochytrium mangrovei Sk-02: effects of glucose, temperature and salinity and their interaction


, : Properties of the docosahexaenoic acid-producer Schizochytrium mangrovei Sk-02: effects of glucose, temperature and salinity and their interaction. Botanica Marina 48(5/6): 387-394

A number of variables potentially affecting docosahexaenoic acid (DHA) formation in Schizochytrium mangrovei Sk-02 were studied in shaken flasks using yeast extract ( 10 g l-1) as a nitrogen source. Usage of fructose, galactose, glucose, glycerol and mannose (60 g l-1) in yeast extract-containing media resulted in production of 3 - 4 g l-1 DHA, with a lower value for galactose. The highest DHA-content (28% w/w) was observed with glycerol. Disaccharides ( maltose and lactose) resulted in poor growth. At a fixed glucose level ( 60 g l-1), biomass and DHA-levels reached a maximum at 25 g l-1 artificial sea salts ( ASS). Replacement of ASS by various sodium salts reduced biomass and DHA- yields. Initial medium pH ( 4 - 7) had little effect on biomass or DHA- formation, but increasing temperature ( 25 - 40[degree]C) negatively affected biomass and DHA- content, though not the ratio of saturated to unsaturated fatty acids. In addition, various combinations of glucose ( 45, 60 and 75 g-1), temperature (25 and 30[degree]C) and salinity (5, 15 and 25 g l-1 ASS) were tested. In general, both biomass and DHA- levels ( as g l-1) increased with increasing glucose, whereas DHA-, but not biomass levels were negatively affected by temperature. The DHA- weight content decreased with temperature. The effect of salinity was not clearly defined. Maximal DHA-level obtained was 4.7 g l-1 (75 g l-1 glucose, 15 - 25 g l-1 ASS and 25[degree]C). We calculate that in a standard medium, only 42% of glucose consumed was directly converted into fatty acids.

US$19.90

DOI: 10.1515/bot.2005.052


Other references

L.H.Hou, 1988: Properties of thermoluminescence (TL) and electron spin resonance (ESR) in deposited carbonates. The formation age of deposited carbonates can be determined by using TL and ESR properties of the calcite crystal. These two properties of calcite have been checked and compared with similar specimens. The crystal structure and contents of impurit...

L.R.ith, D.; Liu, J.L.; Yakar, S.; Accili, D.; Butler, A., 1999: The Cre-lox/P conditional knockout technique as a tool for determining the role of endocrine versus autocrine/paracrine IGF-I. Growth Hormone & IGF Research 9(5): 308, Oct

Alabaster, V.; Davey, M., 1984: Precapillary vessels: effects of the sympathetic nervous system and of catecholamines. The study of receptor-operated control mechanisms involved in adrenergic transmission in the blood vessel wall has substantially advanced the understanding of the factors involved in the maintenance of arteriolar tone. As a result of this work, al...

Nijveldt W., 1971: On the rosette like galls on salix repens d creeping willow d. Entomologische Berichten (Amsterdam) 31(4): 63-71

Adams, C.J.; Baber, R.Angharad.; Batsanov, A.S.; Bramham, G.; Charmant, J.P.H.; Haddow, M.F.; Howard, J.A.K.; Lam, W.Han.; Lin, Z.; Marder, T.B.; Norman, N.C.; Orpen, A.Guy., 2006: Synthesis and reactivity of cobalt boryl complexes. The reaction between [Co(PMe3)4] and B2(4-Mecat)2 (4-Mecat = 1,2-O2-4-MeC6H3) or between [Co(PMe2Ph)4] and B2(cat)2 (cat = 1,2-O2C6H4) affords the paramagnetic Co(II) bisboryl complexes [Co(PMe3)3[B(4-Mecat)]2] and [Co(PMe2Ph)3{B(cat)]2] respectiv...

Mistry, H.; Forbes, S.G.; Fowler, N., 2017: Toxicity Management: Development of a Novel and Immune-Mediated Adverse Events Algorithm
. Novel immunotherapy and biologic agents are being developed with the potential to improve outcomes and reduce long-term toxicities among individuals with hematologic malignancies. These emerging drugs affect neoplastic cells and the surrounding mi...

Zhen, Y-Hong.; Jin, L-Ji.; Guo, J.; Li, X-Yu.; Lu, Y-Nan.; Chen, J.; Xu, Y-Ping., 2008: Characterization of specific egg yolk immunoglobulin (IgY) against mastitis-causing Escherichia coli. The objective of this study was to estimate the in vitro activity of egg yolk immunoglobulin (IgY) against mastitis-causing Escherichia coli. Specific IgY was produced by hens immunized with formaldehyde killed E. coli O111 in long-standing immuni...

Sinanan M., 1985: Endocrine hormone influence of vasoactive intestinal peptide and secretin stimulated exocrine function of the isolated perfused rat pancreas. Regulatory Peptides (SUPPL 3): S55

Bown, P.; Pearson, P., 2009: Calcareous plankton evolution and the Paleocene/Eocene Thermal Maximum event; new evidence from Tanzania. The biotic response of calcareous microplankton at the Paleocene/Eocene thermal maximum (PETM) climate event principally comprised poleward migrations, the appearance of excursion taxa and elevated turnover in calcareous nannoplankton. Here we exa...

Pannekoek, J.Nienke.; van der Werff, S.J.A.; Stein, D.J.; van der Wee, N.J.A., 2014: Advances in the neuroimaging of panic disorder. Models of the neuroanatomy of panic disorder (PD) have relied on both animal work on fear and on clinical data from neuroimaging. Early work hypothesised a network of brain regions involved in fear processing (e.g. the amygdala), but more recent w...