Environmental Microbiology,
Год журнала:
2019,
Номер
21(4), С. 1255 - 1266
Опубликована: Март 9, 2019
Summary
This
study
coupled
a
landscape‐scale
metagenomic
survey
of
denitrification
gene
abundance
in
soils
with
situ
measurements
to
show
how
environmental
factors
shape
distinct
communities
that
exhibit
varying
activity.
Across
hydrologic
gradient,
the
distribution
total
genes
(
nap/nar
+
nirK/nirS
cNor/qNor
nosZ)
inferred
from
read
exhibited
no
consistent
patterns.
However,
when
were
considered
independently,
nirS
,
cNor
and
nosZ
was
positively
associated
areas
higher
soil
moisture,
nitrate
annual
rates,
whereas
nirK
qNor
negatively
these
factors.
These
results
suggest
conditions,
particular
moisture
nitrate,
select
for
are
characterized
by
differential
encoding
apparently
functionally
redundant
proteins.
In
contrast,
taxonomic
analysis
did
not
identify
notable
variability
denitrifying
community
composition
across
sites.
While
capacity
denitrify
ubiquitous
sites,
energetic
costs,
such
as
appear
confer
selective
advantage
microbial
experiencing
more
frequent
saturation
greater
inputs.
suggests
metagenomics
can
help
hotspots
could
be
protected
or
enhanced
treat
non‐point
source
nitrogen
pollution.
Water Research,
Год журнала:
2024,
Номер
256, С. 121618 - 121618
Опубликована: Апрель 15, 2024
The
potential
of
nitrate
electro-bioremediation
has
been
fully
demonstrated
at
the
laboratory
scale,
although
it
not
yet
implemented
due
to
challenges
associated
with
scaling-up
bioelectrochemical
reactors
and
their
on-site
operation.
This
study
describes
initial
start-up
subsequent
stable
operation
an
pilot
plant
for
treatment
nitrate-contaminated
groundwater
(Navata
site,
Spain).
was
operated
under
continuous
flow
mode
3
months,
producing
effluent
suitable
drinking
water
in
terms
nitrates
nitrites
(<50
mg
NO
Environmental Science & Technology,
Год журнала:
2018,
Номер
52(18), С. 10665 - 10672
Опубликована: Авг. 27, 2018
Anaerobic
ammonium
oxidation
(anammox)
combined
with
partial-denitrification
(NO3–
→
NO2–)
is
an
innovative
process
for
the
simultaneous
removal
of
ammonia
and
nitrate
from
wastewaters.
An
efficient
method
selection
partial
denitrifying
community,
which
relies
on
increasing
influent
salinity,
described.
Using
this
method,
a
denitratating
community
was
enriched,
showed
nitrite
accumulation
efficiency
higher
than
75%
as
well
high
conversion
efficiency.
Community
analysis
using
16S
rDNA
indicated
that
Halomonas
became
dominant
genus
salinity
increased.
Metagenomic
revealed
there
not
significant
difference
in
reads
mapping
to
downstream
denitrification
genes
comparison
samples
cultures
5%
those
without
salinity.
The
majority
encoding
dissimilatory
reductases
nar
nirS
came
under
conditions.
Two
metagenome-assembled
genomes
taxonomically
assigned
were
obtained,
one
accounted
∼35%
Both
harbored
complete
pathway.
These
results
indicate
progressive
onset
denitrifiers,
phenotype
where
reduction
only
occurs
after
exhaustion,
could
be
successfully
enriched
Progressive
denitrifiers
may
more
widespread
natural
artificial
habitats
anticipated
are
shown
here
valuable
nitrogen
mitigating
processes.
Environmental Microbiology,
Год журнала:
2019,
Номер
21(4), С. 1255 - 1266
Опубликована: Март 9, 2019
Summary
This
study
coupled
a
landscape‐scale
metagenomic
survey
of
denitrification
gene
abundance
in
soils
with
situ
measurements
to
show
how
environmental
factors
shape
distinct
communities
that
exhibit
varying
activity.
Across
hydrologic
gradient,
the
distribution
total
genes
(
nap/nar
+
nirK/nirS
cNor/qNor
nosZ)
inferred
from
read
exhibited
no
consistent
patterns.
However,
when
were
considered
independently,
nirS
,
cNor
and
nosZ
was
positively
associated
areas
higher
soil
moisture,
nitrate
annual
rates,
whereas
nirK
qNor
negatively
these
factors.
These
results
suggest
conditions,
particular
moisture
nitrate,
select
for
are
characterized
by
differential
encoding
apparently
functionally
redundant
proteins.
In
contrast,
taxonomic
analysis
did
not
identify
notable
variability
denitrifying
community
composition
across
sites.
While
capacity
denitrify
ubiquitous
sites,
energetic
costs,
such
as
appear
confer
selective
advantage
microbial
experiencing
more
frequent
saturation
greater
inputs.
suggests
metagenomics
can
help
hotspots
could
be
protected
or
enhanced
treat
non‐point
source
nitrogen
pollution.
