Biology Tags
Tag based links for
The following links have been tagged Biology by users just like you, because these resources are off-site we cannot guarantee the accuracy or quality of any third-party information.
- The
relationship
between mating
system and
simultaneous
hermaphroditis
m in the coral
reef fish,
Hypoplectrus
nigricans
(Serranidae): Animal
Behaviour,
Vol. 28, No.
2. (May 1980),
pp.
620-633.The
behaviour and
reproductive
ecology of the
simultaneously
hermaphroditic
coral reef
fish,
Hypoplectrus
nigricans
(Serranidae),
the black
hamlet, was
investigated
in an effort
to elucidate
the
relationship
between
simultaneous
hermaphroditis
m and mating
behaviour. The
major features
of the mating
system are as
follows. (1)
Hamlets spawn
only in pairs,
one partner
releasing eggs
and the other
fertilizing
them. There is
no selfing.
(2) Eggs are
planktonic.
There is no
parental care.
(3) The major
courtship
display serves
to advertise
that an
individual has
ripe eggs. (4)
A clutch is
not released
in a single
spawn but is
parcelled over
several,
usually with
the same
partner. (5)
Partners
generally
alternate sex
roles with
each spawn:
that is, they
take turns
giving up
parcels to be
fertilized.
This active
reciprocation
of release of
eggs, called
egg trading,
means that
reproductive
success as a
male depends
upon the
ability to
reproduce as a
female. Since
most of the
reproductive
effort of an
individual is
spent on
female
functions, egg
trading
provides a
fecundity
advantage to
hermaphroditis
m, making it
evolutionarily
stable
relative to
dioecy
(separate
sexes). The
advantage is
analogous to
that which
parthenogeneti
c organisms
have over
sexual ones.
The fecundity
advantage
under egg
trading can
account for
the
maintenance,
but not the
origin of
simultaneous
hermaphroditis
m, since
hermaphroditis
m must be
established
before egg
trading can
evolve.E
Fischer
Source: Animal Behaviour, Vol. 28, No. 2. (May 1980), pp. 620-633. - Biochemical
modeling with
Systems
Biology
Graphical
Notation: Drug Discovery
Today (06
March 2010)
The Systems
Biology
Graphical
Notation
(SBGN) is an
emerging
standard for
graphical
notation
developed by
an
international
systems
biology
community.
Standardized
graphical
notation is
crucial for
efficient and
accurate
communication
of biological
knowledge
between
researchers
with various
backgrounds in
the expanding
field of
systems
biology. Here,
we highlight
SBGN from a
practical
point of view
and describe
how the user
can build and
simulate SBGN
models from a
simple
drag-and-drop
graphical user
interface in
PathwayLab.
Andreas
Jansson, Mats
Jirstrand
Source: Drug Discovery Today (06 March 2010) - A comparison
of nest
building by
three-spined
sticklebacksGa
sterosteus
aculeatusfrom
still and
flowing waters: Journal of
Fish Biology,
Vol. 73, No.
3. (August
2008), pp.
746-752.BJ
Rushbrook, I
Barber
Source: Journal of Fish Biology, Vol. 73, No. 3. (August 2008), pp. 746-752. - Confirming a
biological
pathway in the
metabolic
syndrome--insi
ght from the
NHANES
1999-2002.: Obesity
(Silver
Spring, Md.),
Vol. 16, No.
12. (December
2008), pp.
2676-2681.The
objective of
this study was
to examine the
role of
obesity in the
development of
the metabolic
syndrome (MS).
A total of
3,596 whites
aged 19 years
and above, who
participated
in the
National
Health and
Nutrition
Examination
Survey
(NHANES)
1999-2002,
were included
for analysis.
Anthropometric
measurements,
biochemical
profiles, and
high-sensitivi
ty C-reactive
protein (CRP)
were measured.
A structural
equation model
(SEM) was
constructed to
elucidate a
pathway in
which obesity
initiated the
cascade
leading to
full MS. The
results of SEM
demonstrated
that obesity
was positively
associated
with elevated
CRP level (B =
0.05, P <
0.001). This
higher
inflammatory
state directed
to insulin
resistance (B
= 0.32, P
< 0.001),
which in turn
was positively
associated
with
dyslipidemia
(B = 0.06, P
< 0.001).
Obesity could
also directly
and positively
affect blood
pressure (B =
0.51, P <
0.001),
without the
mediation of
insulin
resistance
and/or
inflammation.
The results of
the
cross-sectiona
l analysis in
the white
subjects have
shown that
obesity has a
strong
influence on
hypertension
that obtains
little
additional
influence from
inflammation
or insulin
resistance.
The metabolic
profile in the
NHANES group
has been
confirmatory
with the
statement that
there is a
sequential
effect from
obesity to
inflammation,
insulin
resistance,
and
dyslipidemia.
This approach
has allowed to
inferring
important
biological
insights about
the nature of
the
relationships
among the
components of
MS.Lian-Yu
Lin, Hsu-Ko
Kuo, Hung-Yuan
Li, Juey-Jen
Hwang, Jou-Wei
Lin
Source: Obesity (Silver Spring, Md.), Vol. 16, No. 12. (December 2008), pp. 2676-2681. - Density-Profil
e Processes
Describing
Biological
Signaling
Networks:
Almost Sure
Convergence to
Deterministic
Trajectories: Journal of
Statistical
Physics, Vol.
136, No. 5. (1
September
2009), pp.
875-901.Abstra
ct
We introduce
jump processes
in ? k ,
called
density-profil
e processes,
to model
biological
signaling
networks. Our
modeling setup
describes the
macroscopic
evolution of a
finite-size
spin-flip
model with k
types of spins
with arbitrary
number of
internal
states
interacting
through a
non-reversible
stochastic
dynamics. We
are mostly
interested on
the
multi-dimensio
nal
empirical-magn
etization
vector in the
thermodynamic
limit, and
prove that,
within
arbitrary
finite
time-intervals
, its path
converges
almost surely
to a
deterministic
trajectory
determined by
a first-order
(non-linear)
differential
equation with
explicit
bounds on the
distance
between the
stochastic and
deterministic
trajectories.
As parameters
of the
spin-flip
dynamics
change, the
associated
dynamical
system may go
through
bifurcations,
associated to
phase
transitions in
the
statistical
mechanical
setting. We
present a
simple example
of spin-flip
stochastic
model,
associated to
a synthetic
biology model
known as
repressilator,
which leads to
a dynamical
system with
Hopf and
pitchfork
bifurcations.
Depending on
the parameter
values, the
magnetization
random path
can either
converge to a
unique stable
fixed point,
converge to
one of a pair
of stable
fixed points,
or
asymptotically
evolve close
to a
deterministic
orbit in ? k .
We also
discuss a
simple
signaling
pathway
related to
cancer
research,
called p53
module.Roberto
Fernández,
Luiz Fontes, E
Neves
Source: Journal of Statistical Physics, Vol. 136, No. 5. (1 September 2009), pp. 875-901.
If you would like to find additional social bookmark based links on the topic of Biology we recommend the Open Tag Directory > Biology. If you would like to find related tags we recommend Tag Patterns > Biology.
Biology Tag Pages: 1
Biology Tag Pages: 1
