Proceedings of the National Academy of Sciences,
Journal Year:
2024,
Volume and Issue:
121(45)
Published: Oct. 28, 2024
Microplastic
is
globally
regarded
as
an
important
factor
impacting
biogeochemical
cycles,
yet
our
understanding
of
such
influences
limited
by
the
uncertainties
intricate
microbial
processes.
By
multiomics
analysis,
coupled
with
soil
chemodiversity
characterization
and
carbon
use
efficiency
(CUE),
we
investigated
how
responses
to
microplastics
impacted
cycling
in
a
long-term
field
experiment.
We
showed
that
biodegradable
promoted
organic
accrual
average
2.47%,
while
nondegradable
inhibited
it
17.4%,
consequence
virus–bacteria
coadaptations
disturbance.
In
relevant
functional
pathways,
significantly
(
P
<
0.05)
enhanced
abundance
transcriptional
activity
related
complex
carbohydrate
metabolism,
whereas
functions
involved
amino
acid
metabolism
glycolysis.
Accordingly,
viral
lysis
treatments
introduce
more
compounds
dissolved
matters,
thus
benefiting
oligotrophs
high
metabolic
capabilities
exploitation
competition.
contrast,
enriched
auxiliary
genes
through
“piggyback-the-winner”
strategy,
conferring
dominant
copiotrophs,
substrate
utilization
capabilities.
These
virus–host
interactions
were
also
demonstrated
corresponding
plastisphere,
which
would
alter
resource
allocation
via
CUE,
affecting
storage
consequently.
Overall,
results
underscore
importance
viral–host
microplastics-dependent
ecosystem.
Water,
Journal Year:
2025,
Volume and Issue:
17(2), P. 151 - 151
Published: Jan. 8, 2025
Eutrophication
is
a
major
environmental
issue
affecting
freshwater
ecosystems
worldwide.
While
its
impact
on
the
composition
of
dissolved
organic
matter
(DOM)
well
recognized,
relationships
between
DOM’s
optical
and
molecular
properties
across
eutrophication
gradients
remain
underexplored.
This
review
synthesizes
recent
research
(derived
from
UV-Vis
absorption
fluorescence
spectroscopy)
characteristics
(analyzed
using
Fourier-transform
ion
cyclotron
resonance
mass
spectrometry,
FT-ICR
MS)
in
systems
varying
trophic
states.
Generalized
additive
model
(GAM)
analysis
was
used
to
assess
correlations
state
index
(TSI).
The
carbon
(DOC),
a254,
SUVA254,
SR,
HIX,
BIX,
FI
averaged
11.44
±
11.97
mg/L,
23.23
16.95
m−1.
2.98
0.99
L·mg−1·m−1,
1.42
0.38,
2.38
1.31,
1.08
0.16,
2.11
0.44,
respectively,
mesotrophic
middle-eutrophic
sites.
GAM
results
revealed
significant
linear
correlation
DOC
properties,
including
FI,
with
TSI,
suggesting
that
DOM
accumulation
intensifies
eutrophication.
such
as
O/C
H/C
ratios,
double
bond
equivalents
(DBEs),
CHOS%
content,
exhibited
nonlinear
TSI.
These
trends
imply
shift
sources
terrestrial
macrophyte-derived
inputs
those
dominated
by
algal-
sediment-derived
progresses.
We
concluded
indices
alone
may
not
serve
reliable
indicator
states;
future
studies
should
focus
integrating
both
offer
more
comprehensive
assessment
Given
limited
number
variables
examined
this
study,
work
only
offers
preliminary
investigation
into
relationship
changes
More
systematic
focusing
molecular-level
analyses
states
broader
geographic
scale
are
needed.
Trends in Ecology & Evolution,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 1, 2025
Ecosystem
ecology
needs
a
framework
that
explicitly
considers
the
roles
of
organic
compounds.
The
molecules
integrates
compound
identity,
diversity,
and
interactions
to
understand
ecosystem
processes,
such
as
nutrient
carbon
cycling.
This
approach
leverages
advances
in
analytical
chemistry
molecular
biology
unravel
complex
chemical
interplay
within
ecosystems.
Limnology and Oceanography,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 7, 2025
Abstract
Lake
sediments
are
hotspots
for
carbon
transformation
and
burial,
where
the
turnover
of
dissolved
organic
matter
(DOM),
influenced
by
molecular
activity,
regulates
global
cycling.
However,
composition
sediment
DOM
how
its
assembly
mechanisms
related
to
activity
remain
poorly
understood.
Here,
63
freshwater
were
collected
from
tropical
cold
temperate
climatic
zones
in
China.
We
explored
underlying
driven
climate,
physicochemical
factors,
microbes
along
gradient
indicated
number
potential
biochemical
transformations
which
a
molecule
is
involved.
Sediment
was
dominated
lipid‐
(35%)
lignin‐like
compounds
(33%),
latter
enriched
as
increased.
Besides,
assemblage
with
higher
had
greater
compositional
similarity
across
different
tended
assemble
deterministically.
Specifically,
average
molecules
increased
0.4
14,
these
structured
shift
stochastic
deterministic
processes,
accounting
≥
75%
thereafter.
Overall,
assemblages
primarily
including
total
electrical
conductivity.
As
increased,
however,
increasingly
affected
climate
bacterial
communities,
consistent
enhanced
complexity
bacterial–molecular
networks.
Collectively,
our
study
highlights
that
regulated
biotic
abiotic
factors
further
constrained
intrinsic
activity.
The
property
of
groundwater
dissolved
organic
matter
(DOM)
subjected
to
anthropogenic
recharge
(AGR)
might
be
affected
by
the
water
quality
disparity
between
surface
and
natural
groundwater.
However,
diverse
molecular
scenarios
DOM
under
uneven
recharging
levels
remain
largely
unexplored.
We
combined
characteristics,
carbon
isotopic
signatures
molecules,
end-member
mixing
analysis
explore
sensitivity
potential
tracking
capabilities
AGR
along
with
gradients.
Our
findings
suggested
that
enriched
diverse,
saturated,
labile,
sulfur-rich
amplifying
abundance
intensity,
which
intensified
Additionally,
S-containing
molecules
their
indicators
like
CHOS%
(with
threshold
values
7.82%)
exhibited
high
predictive
power
for
recognition.
major
(diversity,
saturated
degree,
stability)
indicated
13C-containing
were
similar
whole
pool.
Notably,
specific
(C12H10O5S
C15H16O12),
although
not
detected
in
all
samples,
exhibit
robust
stability
or
favorable
solubility,
rendering
them
candidates
as
AGR-sensitive
molecules.
R13C/12C
ratio
C19H24O5
emerged
most
tracer,
exhibiting
a
strong
correlation
smallest
deviation
from
theoretical
line,
signifying
its
optimal
suitability
precise
source
apportionment.
This
study
offers
novel
insights
into
impacts
contributes
fostering
harmonious
balance
human
activities
resource
sustainability.
