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Document Description
Title
The
role
of
antifreeze
compounds
in
inhibiting
ice
crystal
growth
across
the
skin
of
marine
fishes
Author
Valerio
,
Paul
F.(Paul
Federico)
,
1957-
Description
Thesis
(M.Sc.)--Memorial
University
of
Newfoundland
,
1992.
Biology
Date
1992
Pagination
vii, 83 leaves : ill.
Subject
Cryobiochemistry;
Fishes--Effect
of
temperature
on;
Cold
adaptation;
Marine
fishes--Physiology
Degree
M.Sc.
Degree Grantor
Memorial University of Newfoundland. Dept. of Biology.
Discipline
Biology
Language
Eng
Notes
Bibliography:
leaves
75-83
Abstract
It
has been
well
established
that
antifreeze
peptides
are
responsible
for the
ability
of
many
marine
teleosts
to
survive
in
icy
sea
water
at
temperatures
below
the
colligative
freezing
points
of their
blood.
However
the in
vivo
site
of
antifreeze
action
has
yet
to be
determined.
The
"ice-exclusion
hypothesis"
suggests
that
antifreeze
proteins
act
within
epithelial
membranes
(skin
,
gills
,
gut)
and
block
the
entry
of
external
ice
crystals.
This
hypothesis
was
examined
by
measuring
ice
propagation
temperatures
across
isolated
skin
samples
from the
winter
flounder
(Pleuronectes
americanus).
The
results
obtained
were
consistent
with the
hypothesis
,
indicating
that
fish
skin
is
an
effective
barrier
to
ice
propagation
and that the
effectiveness
of this
barrier
improves
with the
addition
of
antifreeze
proteins.
The
results
also
demonstrated
that the
skin
ice
propagation
temperatures
were
substantially
lower
than the
lethal
freezing
temperatures
of the
fish.
Therefore
,
some
other
epithelial
tissue
(possible
gill)
must
be
less
effective
than the
skin
in
blocking
ice
crystal
penetration
into the
fish.
--
Analysis
of
tissues
from the
cunner
,
Tautociolabrus
adspersus
,
revealed
the
presence
of a
thermal
hysteresis
compound
in
aqueous
extracts
of the
skin.
The
apparent
absence
of this
substance
from
cunner
plasma
provided
further
support
for the
hypothesis
that
antifreeze
proteins
block
the
entry
of
external
ice
crystals
into the
fish.
Type
Text
Resource Type
Electronic
thesis
or
dissertation
Format
Image/jpeg;
Application/pdf
Source
Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Local Identifier
76118650
Rights
The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
Collection
Electronic
Theses
and
Dissertations
Scanning Status
Completed
PDF File
(10.08
MB)
--
http://collections.mun.ca/PDFs/theses2/Valerio_PaulF.pdf
CONTENTdm file name
337178.cpd
