4 research outputs found
Synthesis of D-Sorbose and D-Psicose by Recombinant <i>Escherichia coli</i>
<div><p>GRAPHICAL ABSTRACT</p><p></p></div
Underwater Bubble Manipulation on Surfaces with Patterned Regions with Infused Lubricants
The flexible manipulation of underwater gas bubbles on
solid substrates
has attracted considerable research interest from scientists in the
fields of water electrolysis, bubble microreactions, drug delivery,
and heat transfer. Inspired by the oxygen-binding mechanisms of aquatic
organisms, scientists have designed a series of interfacial materials
for use in collecting gases, detecting and grading bubbles, and conducting
microbubble reactions. Aerophilic surfaces are commonly used in underwater
bubble manipulation platforms due to their excellent gas-trapping
properties. However, during bubble transport, some of the bubbles
are retained in the rough structure of the aerophilic surface and
cause gas loss, which in the long run reduces the gas transport function.
In addition, the aerophilic surface is prone to failure in high-humidity
and high-pressure underwater environments. The lubricant-infused surface
features an oil layer that remains stable on a rough substrate and
is immiscible with water. Additionally, the bubbles are transported
over the oil layer without causing losses other than those dissolved
in water. These attributes make it more favorable than the aerophilic
surface. Inspired by the unique properties of Nepenthes and cactus
spines, we developed a patterned slippery surface [patterned lubricant-infused
surface (PLIS)] through laser etching and ammonia etching that facilitates
the coexistence of superaerophobic and aerophilic surfaces. The PLIS
executes bubble capture utilizing a difference in wettability measuring
78°, transports bubbles through Laplace force and buoyancy, and
regulates bubble release by restricting the contact area on the PLIS.
The PLIS can be prepared rapidly and affordably in just about an hour,
and its potential for large-scale production is high. Following tests
for shear, acid and alkali resistance, and corrosion resistance, the
PLIS exhibited impressive weathering resistance and appears to have
potential for application in some extreme environments
Transforming Flask Reaction into Cell-Based Synthesis: Production of Polyhydroxylated Molecules via Engineered Escherichia coli
Dihydroxyacetone
phosphate (DHAP)-dependent aldolases have been
intensively studied and widely used in the synthesis of carbohydrates
and complex polyhydroxylated molecules. However, strict specificity
toward donor substrate DHAP greatly hampers their synthetic utility.
Here, we transformed DHAP-dependent aldolases-mediated by in vitro
reactions into bioengineered Escherichia coli (E. coli). Such flask-to-cell transformation
addressed several key issues plaguing in vitro enzymatic synthesis:
(1) it solves the problem of DHAP availability by in vivo-hijacking
DHAP from the glycolysis pathway of the bacterial system, (2) it circumvents
purification of recombinant aldolases and phosphatase, and (3) it
dephosphorylates the resultant aldol adducts in vivo, thus eliminating
the additional step for phosphate removal and achieving in vivo phosphate
recycling. The engineered E. coli strains
tolerate a wide variety of aldehydes as acceptor and provide a set
of biologically relevant polyhydroxylated molecules in gram scale
Measurement of the Md<sup>3+</sup>/Md<sup>2+</sup> Reduction Potential Studied with Flow Electrolytic Chromatography
The
reduction behavior of mendelevium (Md) was studied using a flow electrolytic
chromatography apparatus. By application of the appropriate potentials
on the chromatography column, the more stable Md<sup>3+</sup> is reduced
to Md<sup>2+</sup>. The reduction potential of the Md<sup>3+</sup> + e<sup>–</sup> → Md<sup>2+</sup> couple was determined
to be −0.16 ± 0.05 V versus a normal hydrogen electrode