HAYATI Journal of Biosciences,
Год журнала:
2024,
Номер
31(4), С. 630 - 640
Опубликована: Март 6, 2024
Denitrification
and
nitrate-ammonification
are
the
responsible
processes
for
nitrate
removal
in
estuaries.
Temperature,
organic
carbon
availability
key
factors
controlling
a
rate
of
reduction
processes.
This
mixed
cultures
chemostat
study
investigates
competition
ability
their
end-products
bacteria
isolated
from
an
estuary
at
different
temperatures.
will
help
us
to
understand
seasonal
estuary.
The
experiments
showed
that
nitrate-ammonifier
was
predominant
process
steady-state
high
temperature.
While
facultative
denitrifier-nitrate
ammonifier
low
However,
main
end
products
temperature
were
up
61%
N2
indicating
denitrifier
still
had
important
role
data
also
nitrite
respiring
bacterium
reduced
N2,
approximately
6-9%
total
produced
culture.
confirmed
ammonifiers
out-compete
denitrifiers
temperature,
however,
reduction.
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(21)
Опубликована: Янв. 31, 2024
Abstract
Electrochemical
conversion
of
nitrate
offers
an
efficient
solution
to
pollution
and
a
sustainable
strategy
for
ammonia
generation.
Cu
Fe
bimetallic
electrocatalysts
exhibit
excellent
electrochemical
reduction
(NO
3
RR)
reactivity
but
the
conventional
preparation
is
complex
time‐consuming
this
reaction
still
suffers
from
unsatisfied
kinetic
unidentified
mechanisms.
Herein,
in
situ
electrodeposition
employed
induce
modify
active
sites
iron‐based
N‐doping
carbon
nanofiber
electrode
(Fe/Fe
C@NCNFs)
during
NO
RR
Cu‐contained
solution.
Benefiting
synergistic
effect
between
Cu─Fe/Fe
C@NCNFs
electrode,
superior
activity
rate‐determining
(*NO
*NO
2
)
reduced
energy
barriers
following
deoxidation
hydrogenation
steps
are
achieved.
Compared
with
Fe/Fe
C@NCNFs‐500,
pseudo‐first‐order
(PFO)
rate
constant
by
demonstrates
nearly
two‐fold
improvement
high
current
efficiencies
over
wide
pH
voltage
range.
Furthermore,
maximum
─N
removal
capacity
N
selectivity
reach
15593.8
mg
g
−1
ca.
92%
after
twenty
cycles.
This
work
avenue
highly
design,
paving
more
insights
into
interactions
site
construction
performance.
Environment International,
Год журнала:
2024,
Номер
185, С. 108546 - 108546
Опубликована: Март 1, 2024
Mangrove
wetlands
are
hotspots
of
the
global
nitrogen
(N)
cycle
and
important
sinks
microplastics
(MPs)
due
to
their
ecotone
location
between
terrestrial
marine
ecosystems.
However,
effects
MPs
on
N
processes
in
mangrove
ecosystems
still
poorly
understood.
Thus,
present
study
assessed
impacts
by
adding
sediments
a
microcosm
incubation
experiment.
The
results
showed
that
increased
dissolved
organic
carbon
nitrate
but
reduced
ammonium
contents
sediments.
C:N
stoichiometric
N:C-acquiring
enzymatic
ratios,
indicating
an
intensified
limitation
following
exposure
MPs.
decreased
microbial
community
diversity
shifted
sediment
communities
from
r-
K-strategists,
consistent
with
limitation.
In
response,
dissimilatory
reduction
(DNRA)
rates
while
nitrous
oxide
(N2O)
production
suggesting
more
efficient
utilization
treatments.
heteroatoms
such
as
PLA-
PVC-MPs,
DNRA
67.5–78.7%,
exhibiting
stronger
impact
than
PE-MPs.
variation
partitioning
analysis
revealed
variances
N2O
could
be
attributed
synergistic
physicochemical
properties,
nutrient
limitation,
Overall,
this
provides
pertinent
insights
into
new
source
turnover
Frontiers in Marine Science,
Год журнала:
2024,
Номер
11
Опубликована: Июнь 3, 2024
Coastal
eutrophication
is
a
major
issue
of
marine
pollution.
The
main
factors
controlling
must
be
identified
to
ensure
effective
environmental
management
according
the
respective
local
conditions.
Zhanjiang
Bay
(ZJB),
located
northwest
South
China
Sea,
semi-closed
bay
influenced
by
complex
water
flows
and
development
surrounding
cities.
In
this
study,
we
investigated
nutrient
concentrations
compositions
in
ZJB
seawater
over
past
20
years
influencing
based
on
several
field
investigations
from
2006
2022
historical
data.
High
dissolved
inorganic
phosphorus
(DIP)
nitrogen
(DIN)
were
contributors
severe
long-term
ZJB;
however,
light
was
observed
outer
bay,
primarily
caused
chemical
oxygen
demand
(COD)
DIP.
primary
sources
COD
nutrients
riverine
freshwater,
sewage
outfalls,
mariculture
domestic
effluents
carried
rivers.
Tidal
effects
diluted
with
thereby
playing
key
role
redistribution.
DIN:
DIP
ratio
showed
restriction
excess
phosphorus,
owing
activities.
Marine
undertakings
can
exert
various
impacts
quality.
Eliminating
illegal
aquaculture
launching
tailwater
treatment
improve
quality,
whereas
practices
such
as
channel
dredging
may
worsen
it.
This
study
demonstrates
intricate
dynamics
ecosystem
offers
valuable
insights
for
conservation
efforts.
The
growth
of
animal
aquaculture
requires
ever
more
feed.
Yet,
fish
and
crustacean
farming
is
argued
to
be
sustainable
because
wild
use
low
has
improved
over
time.
Here,
accounting
for
trimmings
by-products
from
in
feed,
using
four
different
sources
industry-reported
feed
composition
data,
we
find
ratios
inputs
farmed
outputs
0.36
1.15—27
307%
higher
than
a
previous
estimate
0.28.
Furthermore,
metric
that
incorporates
mortality
during
capture
excludes
unfed
systems
raises
the
mortality–to–farmed
output
ratio
0.57
1.78.
We
also
evaluate
terrestrial
ingredients
feeds.
Widely
cited
estimates
declines
1997
2017
entailed
trade-off
fivefold
increase
crops
same
period.
Our
assessment
challenges
sustainability
fed
its
role
food
security.
Frontiers in Microbiology,
Год журнала:
2024,
Номер
15
Опубликована: Июль 9, 2024
The
nitrogen
(N)
cycle
is
the
foundation
of
biogeochemistry
on
Earth
and
plays
a
crucial
role
in
global
climate
stability.
It
one
most
important
nutrient
cycles
high-altitude
lakes.
almost
entirely
dependent
redox
reactions
mediated
by
microorganisms.
However,
cycling
microbial
communities
saline
lakes
Qinghai-Tibet
Plateau
(QTP),
world's
"third
pole"
has
not
been
investigated
extensively.
In
this
study,
we
used
metagenomic
approach
to
investigate
four
pristine
Altun
mountain
QTP.
We
observed
that
Frontiers in Microbiology,
Год журнала:
2024,
Номер
15
Опубликована: Июль 12, 2024
Invasive
Spartina
alterniflora
(
S.
)
has
significant
impacts
on
sediment
biogeochemical
cycling
in
the
tidal
wetlands
of
estuaries
and
coasts.
However,
impact
exotic
invasion
greenhouse
gases
(GHGs)
production
dynamics
sediments
remain
limited.
Here,
we
investigated
physicochemical
properties,
GHGs
rates,
microbial
gene
abundances
a
native
Cyperus
malacensis
habitat
three
invasive
habitats
(6-,
10-,
14-year)
Minjiang
River
Estuary,
China.
The
methane
(CH
4
),
carbon
dioxide
(CO
2
nitrous
oxide
(N
O)
rates
varied
both
spatially
seasonally,
while
(bacterial
fungal
abundances)
organic
matter
(TOC
TN)
only
spatially.
were
also
characterized
by
higher
values
surface
(0–10
cm)
compared
to
subsurface
(10–20
seasonal
variations
with
summer
than
winter.
can
significantly
increase
CH
CO
matter,
p
<
0.05).
Temperature,
most
dominating
factor
controlling
spatio-temporal
rates.
Overall,
our
findings
highlighted
role
regulating
coastal
wetland
provided
fundamental
data
for
estimating
emissions
sequestration
complex
wetlands.
Frontiers in Microbiology,
Год журнала:
2024,
Номер
15
Опубликована: Июль 22, 2024
Water
reservoir
sediments
represent
a
distinct
habitat
that
harbors
diverse
microbial
resources
crucial
for
nitrogen
cycling
processes.
The
discovery
of
resuscitation
promoting
factor
(Rpf)
has
been
recognized
as
development
in
understanding
the
potential
populations.
However,
our
relationship
between
microorganisms
containing
