ACS ES&T Engineering,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 15, 2024
Phototrophs
with
heterotrophic
bacterial
consortium
as
an
electrode
biocatalyst
are
emerging
concept
for
developing
naturally
sustained
biophotovoltaic
systems.
Herein,
Spirulina
subsalsa-based
mixed
community
anodic
catalyst
in
a
microbial
fuel
cell
(MFC)
setup
ferricyanide
catholyte
78
days
light–dark
(16–8
h)
cycle-based
operation
was
investigated.
The
biofilm
developed
inducted
recalcitrant
comprising
Halomonas,
Alcanivorax,
Pelagibacterium,
and
Rhizobiales
the
major
genera.
In
extended
dark
phase
(9
days)
within
cyclic
operation,
sequential
shift
of
metabolism
from
photosynthesis
to
fermentative
states
increased
population
were
observed.
Under
direct
contact
graphite
anode,
initiated
oscillating
open-circuit
potentials
MFC
response
circadian
trend.
delivered
maxima
587
μW
m–2
418
(at
10
kΩ)
under
corresponding
phases,
respectively.
potential
shifted
more
negative
value,
reaching
−415.5
mV
starvation
period.
Analyses
reaction
rates
(extracted
Tafel
plots),
corrosion
potential,
current,
polarization
resistance,
residual
redox
charges
voltammograms)
performed
understand
processes.
Two
peaks
0.6
V
(irreversible,
extracellular)
0.26
(reversible,
cell-surface
attached)
attributed
mediation
this
process.
Additionally,
catholyte-diffused
interacts
biofilm,
getting
trapped
matrix
polymeric
structures,
thus
preventing
sudden
cytotoxic
elimination
cells
promoting
oxidative
charge
accumulation
over
its
surface,
improving
potential.
Rapid
respiratory
oxygen
consumption,
biofilm's
structural
reorganization,
ferricyanide's
chemical
speciation
inside
primary
factors
that
govern
performance
biofuel
during
prolonged
operations.
critical
findings
unveiled
through
study
advance
our
understanding
resilience
phototroph-based
multispecies
catalysts
devices
long-term
FEMS Microbiology Ecology,
Год журнала:
2024,
Номер
100(5)
Опубликована: Март 26, 2024
Aphanizomenon
flos-aquae
(AFA)
is
the
dominant
filamentous
cyanobacterium
that
develops
into
blooms
in
Upper
Klamath
Lake,
Oregon,
each
year.
During
AFA
bloom
and
collapse,
ecosystem
conditions
for
endangered
Lost
River
shortnose
suckers
deteriorate,
thus
motivating
need
to
identify
processes
limit
abundance
decline.
Here,
we
investigate
relations
between
other
members
of
microbial
community
(photosynthetic
nonphotosynthetic
bacteria
archaea),
how
those
impact
collapse
AFA,
types
suppress
AFA.
We
found
significant
spatial
variation
relative
during
2016
period
using
16S
rRNA
sequencing.
The
Pelican
Marina
site
had
lowest
abundance,
this
was
coincident
with
increased
Candidatus
Sericytochromatia,
Flavobacterium,
Rheinheimera,
some
which
are
known
antagonists.
coincided
phosphorus
limitation
nitrogen
Cyanobium
outcompete
when
dissolved
inorganic
available.
data
collected
study
indicate
importance
combined
structure
suppressing
abundance.
Global Change Biology,
Год журнала:
2024,
Номер
30(11)
Опубликована: Ноя. 1, 2024
ABSTRACT
Long‐term
carbon
sequestration
by
the
ocean's
recalcitrant
dissolved
organic
(RDOC)
pool
regulates
global
climate.
Algae
and
bacteria
interactively
underpin
RDOC
formation.
However,
on
long‐term
scales,
influence
of
their
persistent
interactions
close
to
in
situ
state
ocean
dynamics
accumulation
remains
unclear,
limiting
our
understanding
oceanic
formation
future
trends
under
change.
We
show
that
a
Synechococcus
‐bacteria
interaction
model
system
viable
over
720
days
gradually
accumulated
high
DOC
concentrations
up
84
mg
L
−1
.
Concurrently,
inertness
increased
with
ratio
reaching
>
50%.
The
identified
‐bacteria‐driven
molecules
shared
similarity
half
those
from
pelagic
DOC.
Importantly,
we
provide
direct
genetic
metabolite
evidence
alongside
continuous
transformation
algal
generate
RDOC,
itself
also
directly
synthesized
released
molecules,
representing
neglected
source
~0.2–1
Gt
y
ocean.
found
although
warming
(+4°C)
can
promote
bacterial
growth
release,
it
destabilizes
reduces
reservoirs,
jeopardizing
capacity.
This
study
unveils
previously
underestimated
yet
significant
role
algae
algae‐bacteria
its
vulnerability
warming.
Research Square (Research Square),
Год журнала:
2024,
Номер
unknown
Опубликована: Апрель 15, 2024
AbstractBackground
Picocyanobacteria
from
the
genera
Prochlorococcus,
Synechococcus,
and
Cyanobium
are
most
widespread
photosynthetic
organisms
in
aquatic
ecosystems.
However,
their
freshwater
populations
remain
poorly
explored,
due
to
uneven
insufficient
sampling
across
diverse
inland
waterbodies.
Results
In
this
study,
we
present
170
high-quality
genomes
of
picocyanobacteria
non-axenic
cultures
collected
Central
Europe.
addition,
recovered
33
potential
symbiotic
partners
affiliated
with
four
genera,
Pseudomonas,
Mesorhizobium,
Acidovorax,
Hydrogenophaga.
The
genomic
basis
interactions
involved
heterotrophs
benefiting
picocyanobacteria-derived
nutrients
while
providing
detoxification
ROS.
global
abundance
patterns
picocyanobacteriarevealed
ecologically
significant
ecotypes,
associated
trophic
status,
temperature,
pH
as
key
environmental
factors.
adaptation
(hyper-)eutrophic
waterbodies
could
be
attributed
colonial
lifestyles
CRISPR-Cas
systems.
prevailing
subtypes
were
I-G
I-E,
which
appear
have
been
acquired
through
horizontal
gene
transfer
other
bacterial
phyla.
Conclusions
Our
findings
provide
novel
insights
into
population
diversity,
ecology,
evolutionary
strategies
photoautotrophs
within
Proceedings of the Royal Society B Biological Sciences,
Год журнала:
2024,
Номер
291(2027)
Опубликована: Июль 23, 2024
Cyanobacteria
can
form
complex
interactions
with
heterotrophic
microorganisms,
but
this
relationship
is
susceptible
to
nutrient
concentrations.
Disentangling
the
cyanobacteria-bacteria
in
relation
supply
essential
understanding
their
roles
geochemical
cycles
under
global
change.
We
hypothesize
that
enhanced
oligotrophic
oceans
promote
among
cyanobacteria
and
bacteria.
Therefore,
we
investigated
planktonic
bacteria
elevated
nutrients
caused
by
upwelling
around
a
shallow
deep
seamount
tropical
western
Pacific
Ocean.
found
obviously
higher
complexity
of
network
occurred
significantly
more
chlorophyll
maximum
layer
when
compared
seamount.
shape
bacterial
interaction
community
evenness
response
relatively
high
The
effects
on
cyanobacteria-related
networks
were
further
estimated
based
