Environmental Science and Pollution Research,
Journal Year:
2020,
Volume and Issue:
27(26), P. 33380 - 33384
Published: June 29, 2020
Abstract
Microplastics
(MPs)
are
one
of
the
major
threats
to
aquatic
ecosystems.
Surprisingly,
our
knowledge
its
occurrence
and
impact
on
organisms
that
dwell
in
small
water
bodies
is
still
scarce.
The
aim
this
study
was
investigate
chemical
composition
MPs
tadpoles
pond-breeding
amphibians.
In
total,
201
belonging
5
species
were
collected
from
8
ponds
located
southwestern
Poland.
found
all
examined
sites
studied
species.
Among
those
tested,
53
(26%)
ingested
a
total
71
MPs.
IR-ATR
analysis
revealed
particles
anthropogenic
origin
included
nylon,
polyurethane,
polyisoprene
1,2
polybutadiene.
Proceedings of the National Academy of Sciences,
Journal Year:
2019,
Volume and Issue:
117(3), P. 1395 - 1403
Published: Dec. 17, 2019
Steroid
estrogens
modulate
physiology
and
development
of
vertebrates.
Conversion
C
19
androgens
into
18
is
thought
to
be
an
irreversible
reaction.
Here,
we
report
a
denitrifying
Denitratisoma
sp.
strain
DHT3
capable
catabolizing
or
anaerobically.
Strain
genome
contains
polycistronic
gene
cluster,
emtABCD
,
differentially
transcribed
under
estrogen-fed
conditions
predicted
encode
cobalamin-dependent
methyltransferase
system
conserved
among
estrogen-utilizing
anaerobes;
emtA
-disrupted
derivative
could
catabolize
but
not
estrogens.
These
data,
along
with
the
observed
androgen
production
in
cultures,
suggested
occurrence
estrogen
methylation
form
androgens.
Consistently,
conversion
cell
extracts
requires
methylcobalamin
inhibited
by
propyl
iodide,
specific
inhibitor
enzymes.
The
identification
thus
represents
unprecedented
metabolic
link
between
cobalamin
steroid
metabolism
suggests
that
retroconversion
occurs
biosphere.
Applied and Environmental Microbiology,
Journal Year:
2018,
Volume and Issue:
85(3)
Published: Nov. 16, 2018
Estrogens,
often
detected
in
surface
waters
worldwide,
have
been
classified
as
endocrine
disrupting
chemicals
and
carcinogens.
Bacterial
degradation
is
crucial
for
removing
natural
estrogens
from
engineered
ecosystems;
however,
current
knowledge
regarding
the
biochemical
mechanisms
catabolic
enzymes
involved
estrogen
biodegradation
very
limited.
Our
metabolite
profile
genomic
analyses
on
estrone-degrading
bacteria
enabled
us
to
characterize
aerobic
pathway.
The
results
greatly
expand
our
understanding
of
microbial
steroid
degradation.
In
addition,
characteristic
metabolites,
dead-end
products,
genes
can
be
used
biomarkers
investigate
fate
potential
environment.
Canadian Journal of Fisheries and Aquatic Sciences,
Journal Year:
2017,
Volume and Issue:
75(4), P. 641 - 652
Published: June 26, 2017
Small
ponds
often
survive
the
transition
from
forested
to
suburban
land
cover
and
provide
habitat
for
many
species,
yet
little
is
known
about
how
suburbanization
affects
pond
ecosystems.
We
surveyed
18
small
across
a
forest-to-suburban
gradient
compared
physical
chemical
changes
altered
biological
ecosystem
properties,
such
as
nutrient
food
web
dynamics.
Suburbanization
decreased
canopy
cover,
increased
water
temperatures,
periphyton
chlorophyll
a,
but
was
associated
with
only
weak
increases
in
total
nutrients.
Yet,
stable
isotope
analysis
indicated
that
nitrogen
dynamics
resource
use
web.
observed
δ
15
N
algae,
biofilm,
frog
larvae
gradient,
indicative
of
wastewater
intrusion.
also
shifted
energy
source
dominant
consumer
(Rana
sylvatica;
=
Lithobates
sylvaticus)
leaf
litter
algae.
Overall,
we
identified
cryptic
ecosystems,
highlighting
can
profoundly
impact
nutrients
resources.
As
residential
globally,
may
expect
substantial
shifts
pathways.
Environmental Science and Pollution Research,
Journal Year:
2020,
Volume and Issue:
27(26), P. 33380 - 33384
Published: June 29, 2020
Abstract
Microplastics
(MPs)
are
one
of
the
major
threats
to
aquatic
ecosystems.
Surprisingly,
our
knowledge
its
occurrence
and
impact
on
organisms
that
dwell
in
small
water
bodies
is
still
scarce.
The
aim
this
study
was
investigate
chemical
composition
MPs
tadpoles
pond-breeding
amphibians.
In
total,
201
belonging
5
species
were
collected
from
8
ponds
located
southwestern
Poland.
found
all
examined
sites
studied
species.
Among
those
tested,
53
(26%)
ingested
a
total
71
MPs.
IR-ATR
analysis
revealed
particles
anthropogenic
origin
included
nylon,
polyurethane,
polyisoprene
1,2
polybutadiene.
