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Solvents01:12

Solvents

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A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
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Titration in Nonaqueous Solvents01:16

Titration in Nonaqueous Solvents

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Most acid-base titrations are performed in an aqueous medium. In aqueous titrations, water competes with weaker acids or bases for proton donation or acceptance, leading to ambiguous endpoints in the titration curve. Water also affects the partial ionization of weak acids or bases. For example, water accepts a proton from acetic acid to form hydronium and acetate ions. The hydronium ion formed is a stronger acid than acetic acid, and the acetate ion is a stronger base than water. As a result,...
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Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
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Scalar Product (Dot Product)01:11

Scalar Product (Dot Product)

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The scalar multiplication of two vectors is known as the scalar or dot product. As the name indicates, the scalar product of two vectors results in a number, that is, a scalar quantity. Scalar products are used to define work and energy relations. For example, the work that a force (a vector) performs on an object while causing its displacement (a vector) is defined as a scalar product of the force vector with the displacement vector.
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Vector Product (Cross Product)01:17

Vector Product (Cross Product)

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Vector multiplication of two vectors yields a vector product, with the magnitude equal to the product of the individual vectors multiplied by the sine of the angle between both the vectors and the direction perpendicular to both the individual vectors. As there are always two directions perpendicular to a given plane, one on each side, the direction of the vector product is governed by the right-hand thumb rule.
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Primary Production01:06

Primary Production

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The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
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Preparation of Biopolymer Aerogels Using Green Solvents
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Solvent production from xylose.

Kevin T Finneran1, Jovan Popovic2

  • 1Department of Environmental Engineering and Earth Sciences, Clemson University, 105, Collings St., Clemson, SC, USA. ktf@clemson.edu.

Applied Microbiology and Biotechnology
|August 16, 2018
PubMed
Summary
This summary is machine-generated.

Xylose utilization in fermentation is challenging due to carbohydrate catabolite repression, hindering biofuel production. New strategies are emerging to improve xylose fermentation efficiency from lignocellulose biomass.

Keywords:
Bio butanolBiofuelsXylose fermentation

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Area of Science:

  • Biotechnology
  • Biochemical Engineering
  • Renewable Energy

Background:

  • Xylose, a major lignocellulose sugar, is underutilized in fermentation compared to glucose.
  • Carbohydrate catabolite repression favors glucose over xylose, limiting efficiency in biofuel production.
  • Ignoring xylose potential from biomass is shortsighted despite its abundance.

Purpose of the Study:

  • To review and analyze strategies for enhancing xylose utilization in fermentation.
  • To address challenges in xylose fermentation for improved biofuel production.
  • To compare different approaches for increasing xylose fermentation efficiency.

Main Methods:

  • Review of traditional engineering and cellular approaches to overcome catabolite repression.
  • Analysis of genetic engineering strategies for improved xylose metabolism.
  • Evaluation of "drop-in" fermentation strategies for industrial application.

Main Results:

  • Various strategies exist to improve xylose fermentation, ranging in complexity and stability.
  • Cellular and traditional engineering methods aim to mitigate catabolite repression.
  • Genetic engineering offers a nascent but promising avenue for boosting xylose utilization.

Conclusions:

  • Improving xylose fermentation is crucial for maximizing biofuel yields from lignocellulose.
  • A range of methods, including genetic engineering, can enhance xylose conversion.
  • Further research is needed to optimize xylose utilization for sustainable biofuel production.