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Category Archives: Biotechnology
Biotechnology and Bioengineering – Bradley Ringeisen – Video
Video Abstract: Author Bradley Ringeisen on his recently published B
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Biotechnology and Bioengineering - Bradley Ringeisen - Video
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TV SBT — Interview of Prof. Dr. MC Meyer on Ancestral Knowledge
TV Interview of Prof.
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TV SBT -- Interview of Prof. Dr. MC Meyer on Ancestral Knowledge
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Xylan oligosaccharides and cellobiohydrolase I (TrCel7A) interaction and effect on activity
Background:
The well studied cellulase mixture secreted by Trichoderma reesei (anamorph to Hypocrea jecorina) contains two cellobiohydolases (CBH, TrCel7A and TrCel6a) that are core enzymes for the solubilisation of cellulose. This has attracted significant research interest due the role of the CBHs in the conversion of biomass to fermentable sugars. However, the CHBs are notoriously slow and susceptible to inhibition, and this challenges the commercial utilization of biomass. One cause of reduced activity that has been suggested repeatedly is the xylans and xylan fragments that are also present in the biomass. Yet, the extent and mechanisms of this inhibition remains poorly elucidated. Therefore, we have studied xylan oligoscaccharides (XOS) of variable lengths with respect to their binding and inhibition of both TrCel7A and an enzyme variant without the cellulose binding domain (CBM).
Results:
The binding of xylan oligosaccharides (XOS) to TrCel7A is studied by isothermal titration calorimetry. It is shown that XOS bind to TrCel7A and that the affinity increases commensurate with the XOS length. The cellulose binding domain, on the other hand, does not affect the affinity significantly; this suggests that XOS may bind to the active site. Activity assays of TrCel7a clearly demonstrate the negative effect of the presence of XOS on the turnover number.
Conclusions:
On the basis of these binding data and a comparison of XOS inhibition of the activity of the two enzyme variants towards, respectively, soluble and insoluble substrates, we propose a competitive mechanism for XOS inhibition of TrCel7A with phosphoric swollen cellulose as a substrate.Source:
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Silage produces biofuel for local consumption
Background:
In the normal process of bio-ethanol production, biomass is transported to integrated large factories for degradation to sugar, fermentation, and recovery of ethanol by distillation. Biomass nutrient loss occurs during preservation and degradation. Our aim was to develop a decentralized ethanol production system appropriate for farm or co-operative level production that uses a solid-state fermentation method for producing bio-ethanol from whole crops, provides cattle feed, and produces no wastes. The idea is to incorporate traditional silage methods with simultaneous saccharification and fermentation. Harvested, fresh biomass is ensiled with biomass-degrading enzymes and yeast. Multiple parallel reactions for biomass degradation and ethanol and lactic acid production are induced in solid culture in hermetically sealed containers at a ranch. After fermentation, ethanol is collected on site from the vapor from heated fermented products.
Results:
The parallel reactions of simultaneous saccharification and fermentation were induced efficiently in the model fermentation system. In a laboratory-scale feasibility study of the process, 250 g of freshly harvested forage rice with 62% moisture was treated with 0.86 filter paper units/g dry matter (DM) of cellulase and 0.32 U/g DM of glucoamylase. After 20 days of incubation at 28 degreesC, 6.4 wt.% of ethanol in fresh matter (equivalent to 169 g/kg DM) was produced. When the 46 wt.% moisture was gathered as vapor from the fermented product, 74% of the produced ethanol was collected. Organic cellular contents (such as the amylase and pronase degradable fractions) were decreased by 63% and organic cell wall (fiber) content by 7% compared to silage prepared from the same material.
Conclusions:
We confirmed that efficient ethanol production is induced in nonsterilized whole rice plants in a laboratory-scale solid-state fermentation system. For practical use of the method, further study is needed to scale-up the fermentation volume, develop an efficient ethanol recovery method, and evaluate the fermentation residue as an actual cattle feed.Source:
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Mychonastes afer HSO-3-1 as a potential new source of biodiesel
Background:
Biodiesel is considered to be a promising future substitute for fossil fuels, and microalgae are one source of biodiesel. The ratios of lipid, carbohydrates and proteins are different in different microalgal species, and finding a good strain for oil production remains a difficult prospect. Strains producing valuable co-products would improve the viability of biofuel production.
Results:
In this study, we performed sequence analysis of the 18S rRNA gene and internal transcribed spacer (ITS) of an algal strain designated HSO-3-1, and found that it was closely related to the Mychonastes afer strain CCAP 260/6. Morphology and cellular structure observation also supported the identification of strain HSO-3-1 as M. afer. We also investigated the effects of nitrogen on the growth and lipid accumulation of the naturally occurring M. afer HSO-3-1, and its potential for biodiesel production. In total, 17 fatty acid methyl esters (FAMEs) were identified in M. afer HSO-3-1, using gas chromatography/mass spectrometry. The total lipid content of M. afer HSO-3-1 was 53.9% of the dry cell weight, and we also detected nervonic acid (C24:1), which has biomedical applications, making up 3.8% of total fatty acids). The highest biomass and lipid yields achieved were 3.29 g/l and 1.62 g/l, respectively, under optimized conditions.
Conclusion:
The presence of octadecenoic and hexadecanoic acids as major components, with the presence of a high-value component, nervonic acid, renders M. afer HSO-3-1 biomass an economic feedstock for biodiesel production.Source:
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Breast Cancer and Biotechnology: Bigger Than Pink – Video
The world's best hope for turning breast cancer -- and other forms of cancer -- into a chronic manageable disease lies within biotechnology.
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