iScience,
Год журнала:
2020,
Номер
23(12), С. 101794 - 101794
Опубликована: Ноя. 10, 2020
Anaerobic
digestion
was
one
of
the
first
bioenergy
strategies
developed,
yet
interactions
microbial
community
that
is
responsible
for
production
methane
are
still
poorly
understood.
For
example,
it
has
only
recently
been
recognized
bacteria
oxidize
organic
waste
components
can
forge
electrical
connections
with
methane-producing
microbes
through
biologically
produced,
protein-based,
conductive
circuits.
This
direct
interspecies
electron
transfer
(DIET)
faster
than
exchange
via
diffusive
carriers,
such
as
H2.
DIET
also
more
resilient
to
perturbations
increases
in
load
inputs
or
toxic
compounds.
However,
current
digester
practices
rarely
predominates.
Improvements
anaerobic
associated
addition
electrically
materials
have
attributed
increased
DIET,
but
experimental
verification
lacking.
deficiency
may
soon
be
overcome
improved
understanding
diversity
capable
which
leading
molecular
tools
determining
extent
DIET.
Here
we
review
microbiology
suggest
monitoring
digesters,
and
propose
approaches
re-engineering
design
encourage
The
field
of
microbiome
research
has
evolved
rapidly
over
the
past
few
decades
and
become
a
topic
great
scientific
public
interest.
As
result
this
rapid
growth
in
interest
covering
different
fields,
we
are
lacking
clear
commonly
agreed
definition
term
"microbiome."
Moreover,
consensus
on
best
practices
is
missing.
Recently,
panel
international
experts
discussed
current
gaps
frame
European-funded
MicrobiomeSupport
project.
meeting
brought
together
about
40
leaders
from
diverse
areas,
while
more
than
hundred
all
world
took
part
an
online
survey
accompanying
workshop.
This
article
excerpts
outcomes
workshop
corresponding
embedded
short
historical
introduction
future
outlook.
We
propose
based
compact,
clear,
comprehensive
description
provided
by
Whipps
et
al.
1988,
amended
with
set
novel
recommendations
considering
latest
technological
developments
findings.
clearly
separate
terms
microbiota
provide
discussion
composition
microbiota,
heterogeneity
dynamics
microbiomes
time
space,
stability
resilience
microbial
networks,
core
microbiomes,
functionally
relevant
keystone
species
as
well
co-evolutionary
principles
microbe-host
inter-species
interactions
within
microbiome.
These
broad
definitions
suggested
unifying
concepts
will
help
to
improve
standardization
studies
future,
could
be
starting
point
for
integrated
assessment
data
resulting
transfer
knowledge
basic
science
into
practice.
Furthermore,
standards
important
solving
new
challenges
associated
anthropogenic-driven
changes
planetary
health,
which
understanding
might
play
key
role.
Video
Abstract.
Environmental Science & Technology,
Год журнала:
2018,
Номер
52(18), С. 10241 - 10253
Опубликована: Авг. 17, 2018
Conductive
materials
(CM)
have
been
extensively
reported
to
enhance
methane
production
in
anaerobic
digestion
processes.
The
occurrence
of
direct
interspecies
electron
transfer
(DIET)
microbial
communities,
as
an
alternative
or
complementary
indirect
(via
hydrogen
formate),
is
the
main
explanation
given
justify
improvement
production.
Not
disregarding
that
DIET
can
be
promoted
presence
certain
CM,
it
surely
does
not
explain
all
observations.
In
fact,
methanogenic
environments
was
only
unequivocally
demonstrated
cocultures
Geobacter
metallireducens
with
Methanosaeta
harundinacea
Methanosarcina
barkeri
and
frequently
sp.
are
detected
improved
driven
systems.
Furthermore,
conductive
carbon
nanotubes
were
shown
accelerate
activity
methanogens
growing
pure
cultures,
where
expected
occur,
hydrogenotrophic
ubiquitous
full-scale
digesters
treating
for
example
brewery
wastewaters,
indicating
important
mechanism
those
This
paper
presents
overview
effect
several
iron-based
carbon-based
CM
bioengineered
systems,
focusing
on
communities'
changes.
Control
assays,
fundamental
elements
support
major
conclusions
experiments,
critically
revised
discussed.
Chemical Reviews,
Год журнала:
2020,
Номер
120(23), С. 12903 - 12993
Опубликована: Окт. 14, 2020
Bioelectrocatalysis
is
an
interdisciplinary
research
field
combining
biocatalysis
and
electrocatalysis
via
the
utilization
of
materials
derived
from
biological
systems
as
catalysts
to
catalyze
redox
reactions
occurring
at
electrode.
synergistically
couples
merits
both
electrocatalysis.
The
advantages
include
high
activity,
selectivity,
wide
substrate
scope,
mild
reaction
conditions.
possible
renewable
electricity
electron
source
energy
conversion
efficiency.
These
properties
are
integrated
achieve
selective
biosensing,
efficient
conversion,
production
diverse
products.
This
review
seeks
systematically
comprehensively
detail
fundamentals,
analyze
existing
problems,
summarize
development
status
applications,
look
toward
future
directions
bioelectrocatalysis.
First,
structure,
function,
modification
bioelectrocatalysts
discussed.
Second,
essentials
bioelectrocatalytic
systems,
including
transfer
mechanisms,
electrode
materials,
medium,
described.
Third,
application
bioelectrocatalysis
in
fields
biosensors,
fuel
cells,
solar
catalytic
mechanism
studies,
bioelectrosyntheses
high-value
chemicals
summarized.
Finally,
developments
a
perspective
on
suggested.
Environmental Science & Technology,
Год журнала:
2020,
Номер
54(9), С. 5755 - 5766
Опубликована: Апрель 7, 2020
Acceleration
of
the
anaerobic
digestion
(AD)
process
is
crucial
to
achieving
energy-efficient
recycling
organic
wastes.
Hydrochar
produced
by
hydrothermal
liquefaction
biomass,
yet
its
application
in
AD
rarely
reported.
The
present
study
showed
that
sewage
sludge-derived
hydrochar
(SH)
enhanced
methane
production
rate
glucose
37%.
SH
increased
from
acetate
but
did
not
affect
acidification
and
H2/CO2.
hydrogenotrophic
methanogenesis,
which
could
be
due
direct
interspecies
electron
transfer
(DIET)
converting
H+,
e–,
CO2
methane.
Trichococcus
Methanosaeta
were
dominant
with
SH.
Label-free
proteomic
analysis
was
involved
DIET
as
reflected
up-regulation
proteins
methanogenesis.
Hydrochars
derived
corn
straw
(CH),
Enteromorpha
algae
(EH),
poplar
wood
(PH),
well
activated
carbon
(AC),
also
tested
process.
SH,
CH,
EH
obviously
rates,
39%,
15%,
20%
higher
than
control
experiment,
respectively.
It
neither
electrical
conductivity
nor
total
redox
property
hydrochars
AC
abundances
surface
oxygen-containing
functional
groups
correlated
rates.
Environmental Science & Technology,
Год журнала:
2018,
Номер
52(12), С. 7160 - 7169
Опубликована: Май 21, 2018
At
present,
high-solids
anaerobic
digestion
of
sewage
sludge
has
drawn
great
attention
due
to
the
superiority
its
small
land
area
footprint
and
low
energy
consumption.
However,
a
high
organic
loading
rate
may
cause
acids
accumulation
ammonia
inhibition,
thus
leading
an
inhibited
pseudo-steady
state
in
which
electron
transfer
through
interspecies
hydrogen
(IHT)
between
acetogens
methanogens
is
blocked.
In
this
study,
adding
50
mg/g
TS
(total
solid)
magnetite
clearly
reduced
short-chain
fatty
accelerated
methane
production
by
26.6%.
As
demonstrated,
individual
processes
could
not
be
improved
when
methanogenesis
was
interrupted.
Analyzing
stable
carbon
isotopes
investigating
pathways
using
acetate
H2/CO2
as
substrates
together
proved
that
direct
(DIET)
enhanced
magnetite.
Metatranscriptomic
analysis
determination
key
enzymes
showed
IHT
partially
substituted
DIET,
acetate-dependent
after
blockage
scavenged.
Additionally,
expression
both
pili
c-type
cytochromes
found
decrease,
indicating
replace
their
roles
for
efficient
methanogens;
thus,
robust
chain
established.
