A clock for all seasons
Journal of Comparative Physiology A,
Journal Year:
2024,
Volume and Issue:
210(4), P. 473 - 480
Published: June 19, 2024
Abstract
Circadian
clocks
play
an
essential
role
in
adapting
locomotor
activity
as
well
physiological,
and
metabolic
rhythms
of
organisms
to
the
day-night
cycles
on
Earth
during
four
seasons.
In
addition,
they
can
serve
a
time
reference
for
measuring
day
length
adapt
advance
annual
changes
environment,
which
be
particularly
pronounced
at
higher
latitudes.
The
physiological
responses
are
also
known
photoperiodism.
This
special
issue
Journal
Comparative
Physiology
A
aims
account
diurnal
photoperiodic
adaptations
by
presenting
collection
ten
review
articles,
five
original
research
three
perspective
pieces.
contributions
include
historical
accounts,
circadian
clock
models,
epigenetic,
molecular,
neuronal
mechanisms
seasonal
adaptations,
latitudinal
differences
studies
wild
that
address
challenges
global
change.
Language: Английский
Melatonin and Seasonal Synchrony in Mammals
Journal of Pineal Research,
Journal Year:
2024,
Volume and Issue:
76(5)
Published: Aug. 1, 2024
ABSTRACT
In
mammals,
seasonal
opportunities
and
challenges
are
anticipated
through
programmed
changes
in
physiology
behavior.
Appropriate
anticipatory
timing
depends
on
synchronization
to
the
external
solar
year,
achieved
use
of
day
length
(photoperiod)
as
a
synchronizing
signal.
nocturnal
production
melatonin
by
pineal
gland
is
key
hormonal
mediator
photoperiodic
change,
exerting
its
effects
via
hypothalamopituitary
axis.
this
review/perspective,
we
consider
developments
during
history
research
into
synchronizer
effect
melatonin,
highlighting
role
that
pars
tuberalis
–tanycyte
module
plays
process.
We
go
downstream
pathways,
which
include
discrete
hypothalamic
neuronal
populations.
Neurons
express
neuropeptides
kisspeptin
(Arg)(Phe)–related
peptide‐3
(RFRP‐3)
govern
reproductive
function
while
neurons
somatostatin
may
be
involved
metabolic
adaptations.
Finally,
identify
several
outstanding
questions,
need
addressed
provide
much
thorough
understanding
deep
impact
upon
synchronization.
Language: Английский
Erwin Bünning and Wolfgang Engelmann: establishing the involvement of the circadian clock in photoperiodism
Journal of Comparative Physiology A,
Journal Year:
2024,
Volume and Issue:
210(4), P. 481 - 493
Published: May 28, 2024
In
1936,
Erwin
Bünning
published
his
groundbreaking
work
that
the
endogenous
clock
is
used
to
measure
day
length
for
initiating
photoperiodic
responses.
His
publication
triggered
years
of
controversial
debate
until
it
ultimately
became
basic
axiom
rhythm
research
and
theoretical
pillar
chronobiology.
Bünning's
thesis
frequently
quoted
in
articles
this
special
issue
on
subject
"A
all
seasons".
However,
nowadays
only
few
people
know
detail
about
experiments
almost
nobody
knows
contribution
former
doctoral
student,
Wolfgang
Engelmann,
theory
because
most
topic
German.
The
aim
review
give
an
overview
important
at
time,
including
Engelmann's
thesis,
which
he
demonstrated
importance
circadian
flower
induction
Flaming
Katy,
Kalanchoë
blossfeldiana,
but
not
Red
Morning
Glory,
Ipomoea
coccinea.
Language: Английский
From Seasonality to Species Conservation: Chronobiological Research on European Hamsters in Strasbourg, France
Journal of Pineal Research,
Journal Year:
2024,
Volume and Issue:
76(7)
Published: Oct. 1, 2024
ABSTRACT
The
first
monograph
on
the
European
hamster
from
Strasbourg
region
dates
back
to
1765.
By
1930s,
a
long
and
continuous
chronobiological
research
tradition
was
established
for
this
species,
starting
with
works
of
Charles
Kayser,
who
published
between
1938
1971.
Another
early
key
researcher
in
area
Bernhard
Canguilhem
publications
1966
1999.
From
1980s
onwards,
“the
Pévets,”
Paul
Pévet
his
wife,
Mireille
Masson‐Pévet,
gave
new
energy
research.
They
broadened
scope
basic
hibernation
mechanistic
studies
circannual
rhythms
physiological
aspects
molecular
details.
One
main
underlying
question
their
role
melatonin.
Thanks
enthusiasm
vision,
is
today
one
best
–
if
not
studied
species.
At
least
73
parameters
are
described
cycle.
Thirty‐two
them
have
been
shown
be
driven
by
clock.
Moreover,
ground‐breaking
advances
our
understanding
hibernation,
clock
functioning,
its
entrainment
were
made.
With
most
being
conducted
Strasbourg,
instrumental
providing
necessary
resources
that
made
these
innovative
unconventional
long‐term
animal
possible,
contributing
fundamental
and,
ultimately,
species
conservation.
Language: Английский