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- `Ionic' size
differences
from
bond-valence
parameters and
from ionic
radii: Acta
Crystallograph
ica Section B:
Structural
Science, Vol.
62, No. 3.
(June 2006),
pp.
411-416.Keller
, , Krämer,
Source: Acta Crystallographica Section B: Structural Science, Vol. 62, No. 3. (June 2006), pp. 411-416. - Experimental
versus
expected
halide-ion
size
differences;
structural
changes in
three series
of isotypic
bismuth
chalcogenide
halides: Acta
Crystallograph
ica Section B:
Structural
Science, Vol.
62, No. 3.
(June 2006),
pp.
417-423.Keller
, , Krämer,
Source: Acta Crystallographica Section B: Structural Science, Vol. 62, No. 3. (June 2006), pp. 417-423. - Is foreign
exchange
intervention
by central
banks bad news
for debt
markets?: A
case of
Reserve Bank
of Australia's
interventions
1986-2003: Journal of
International
Financial
Markets,
Institutions
and Money,
Vol. 16, No.
5. (December
2006), pp.
446-467.We
investigate
the effects of
the Reserve
Bank of
Australia's
foreign
exchange
interventions
on the USD/AUD
market and
90-day and
10-year
interest rate
futures
markets for
the period
July
1986-December
2003. Using
recently
released
revised and
updated
intervention
data, we
investigate
contemporaneou
s and
disaggregated
intervention
influences and
find
significant
evidence for
(i)
intervention
effectiveness
in moderating
the
contemporaneou
s exchange
rate movements
especially if
interventions
were
cumulative and
large, (ii)
exchange rate
volatility
reducing
effect with a
day's lag,
(iii)
undesirable
interest rate
movements
following
interventions
in some
periods
compromising
monetary
policy
effectiveness,
and (iv) a
volatility
reducing
effect of
cumulative
interventions
in the 90-day
rate, and a
volatility
increasing
effect of
large
interventions
in both the
90-day and
10-year rate
futures. These
findings are a
unique and
significant
contribution
to the
prevailing
literature as
they
demonstrate
that the RBA's
interventions
matter not
only for the
foreign
exchange
market but
also for the
debt
markets.Suk-Jo
ong Kim, Cyril
Pham
Source: Journal of International Financial Markets, Institutions and Money, Vol. 16, No. 5. (December 2006), pp. 446-467. - Arbitrage and
the
Expectations
Hypothesis: The Journal of
Finance, Vol.
55, No. 2.
(2000), pp.
989-994.This
paper shows
that all
traditional
forms of the
expectations
hypothesis can
be consistent
with the
absence of
arbitrage if
markets are
incomplete. A
key
implication is
that the
validity of
the
expectations
hypothesis is
purely an
empirical
issue; the
expectations
hypothesis
cannot be
ruled out on a
priori
theoretical
grounds.Franci
s Longstaff
Source: The Journal of Finance, Vol. 55, No. 2. (2000), pp. 989-994. - Dealer
behavior in
the specials
market for US
Treasury
securities: Journal of
Financial
Intermediation
, Vol. 16, No.
2. (April
2007), pp.
204-228.We
assess dealer
behavior in
the specials
market for US
Treasury
securities by
comparing
dealer
participation
in the Federal
Reserve's
securities
loan auctions
with prices in
the private
market. Dealer
behavior is
generally
consistent
with the law
of one price
and apparent
violations can
largely be
explained by
institutional
differences
between the
private market
and the Fed's
program.
However, for
auctions that
are
effectively
noncompetitive
, dealers
regularly pass
up true
arbitrage
opportunities
and frequently
overpay to
borrow
securities.
Dealers
apparently do
not realize
that certain
auctions are
noncompetitive
, even though
the
information
needed to
discern this
fact is
publicly
available in
advance.Michae
l Fleming,
Kenneth
Garbade
Source: Journal of Financial Intermediation, Vol. 16, No. 2. (April 2007), pp. 204-228. - The U.S.
Treasury yield
curve: 1961 to
the present: Journal of
Monetary
Economics,
Vol. 54, No.
8. (November
2007), pp.
2291-2304.The
discount
function,
which
determines the
value of all
future nominal
payments, is
the most basic
building block
of finance and
is usually
inferred from
the Treasury
yield curve.
It is
therefore
surprising
that
researchers
and
practitioners
do not have
available to
them a long
history of
high-frequency
yield curve
estimates.
This paper
fills that
void by making
public the
Treasury yield
curve
estimates of
the Federal
Reserve Board
at a daily
frequency from
1961 to the
present. We
use a
well-known and
simple
smoothing
method that is
shown to fit
the data very
well. The
resulting
estimates can
be used to
compute yields
or forward
rates for any
horizon. We
hope that the
data, which
are posted on
the website
http://www.fed
eralreserve.go
v/pubs/feds/20
06 and which
will be
updated
quarterly,
will provide a
benchmark
yield curve
that will be
useful to
applied
economists.Ref
et Gurkaynak,
Brian Sack,
Jonathan
Wright
Source: Journal of Monetary Economics, Vol. 54, No. 8. (November 2007), pp. 2291-2304. - Theory of
hydrogen
bonded chains
in
bioenergetics: The Journal of
Chemical
Physics, Vol.
72, No. 7.
(1980), pp.
3959-3971.JF
Nagle, M
Mille, HJ
Morowitz
Source: The Journal of Chemical Physics, Vol. 72, No. 7. (1980), pp. 3959-3971. - Use of
Calculated
Cation-?
Binding
Energies to
Predict
Relative
Strengths of
Nicotinic
Acetylcholine
Receptor
Agonists: ACS Chemical
Biology, Vol.
3, No. 11. (21
November
2008), pp.
693-702.doi:
10.1021/cb8001
89y Agonists
and
antagonists of
the nicotinic
acetylcholine
receptor
(nAChR) are
used to treat
nicotine
addiction,
neuromuscular
disorders, and
neurological
diseases. In
designing
small molecule
therapeutics
with the nAChR
as a target,
it is useful
to identify
chemical
parameters
that correlate
with ability
to activate
the receptor.
Previous
studies have
shown that
cation-?
interactions
at the
transmitter
binding sites
of the nAChR
are important
for receptor
activation by
strong
agonists such
as
acetylcholine.
We
hypothesized
that a
calculated
estimate of
cation-?
binding
ability could
be used to
predict the
efficiency for
channel
opening (i.e.,
the gating
efficiency)
associated
with
activation of
the
acetylcholine
receptor by a
series of
structurally
related
organic
cations. We
demonstrate
that the
calculated
cation-?
energy is
strongly
correlated
with gating
efficiency but
only weakly
correlated
with
closed-state
binding
affinity. Our
results
suggest that
cation-?
interactions
contribute
significantly
to the
open-state
affinity of
these cations
and that the
calculated
cation-?
energy will be
a useful
parameter for
designing
nAChR agonists
and
antagonists.Ma
thew Tantama,
Stuart Licht
Source: ACS Chemical Biology, Vol. 3, No. 11. (21 November 2008), pp. 693-702. - On the
Cooperativity
of
Cation−
π and
Hydrogen
Bonding
Interactions: J. Phys. Chem.
B (3 July
2008)Abstract:
Quantum
chemical
calculations
are performed
to gauge the
effect of
cationÀ and
hydrogen
bonding
interactions
on each other.
Mphenolaccepto
r (M = Li+ and
Mg2+; acceptor
= H2O, HCOOH,
HCN, CH3OH,
HCONH2 and
NH3) is taken
as a model
ternary system
that exhibits
the cationÀ
and hydrogen
bonding
interactions.
Cooperativity
is quantified
and the
computed
positive
cooperativity
between
cationÀ and
hydrogen
bonding
interactions
is
rationalized
through
reduced
variational
space (RVS)
and charge
analyses.Dolly
Vijay, Hendrik
Zipse,
Narahari
Sastry
Source: J. Phys. Chem. B (3 July 2008) - Predicting
Hydrogen-Bond
Strengths from
Acid−Ba
se Molecular
Properties.
The pKa Slide
Rule: Toward
the Solution
of a
Long-Lasting
Problem: Acc. Chem.
Res. (16
October
2008)Abstract:
Unlike normal
chemical
bonds,
hydrogen bonds
(H-bonds)
characteristic
ally feature
binding
energies and
contact
distances that
do not simply
depend on the
donor (D) and
acceptor (:A)
nature.
Instead, their
chemical
context can
lead to large
variations
even for a
same
donoracceptor
couple. As a
striking
example, the
weak HOH···OH2
bond in
neutral water
changes, in
acidic or
basic medium,
to the 6-fold
stronger and
15% shorter
[H2O···H···OH2
]+ or
[HO···H···OH]
bonds. This
surprising
behavior,
sometimes
called the
H-bond puzzle,
practically
prevents
prediction of
H-bond
strengths from
the properties
of the
interacting
molecules.
Explaining
this puzzle
has been the
main research
interest of
our laboratory
in the last 20
years. Our
first
contribution
was the
proposal of
RAHB
(resonance-ass
isted H-bond),
a new type of
strong H-bond
where donor
and acceptor
are linked by
a short
À-conjugated
fragment. The
RAHB discovery
prompted new
studies on
strong
H-bonds,
finally
leading to a
general H-bond
classification
in six
classes,
called the six
chemical
leitmotifs,
four of which
include all
known types of
strong bonds.
These studies
attested to
the covalent
nature of the
strong H-bond
showing, by a
formal
valence-bond
treatment,
that weak
H-bonds are
basically
electrostatic
while stronger
ones are
mixtures of
electrostatic
and covalent
contributions.
The covalent
component
gradually
increases as
the difference
of
donoracceptor
proton
affinities,
PA, or acidic
constants,
pKa,
approaches
zero. At this
limit, the
strong and
symmetrical
D···H···A
bonds formed
can be viewed
as true
three-center-f
our-electron
covalent
bonds. These
results
emphasize the
role PA/pKa
equalization
plays in
strengthening
the H-bond, a
hypothesis
often invoked
in the past
but never
fully
verified. In
this Account,
this
hypothesis is
reconsidered
by using a new
instrument,
the pKa slide
rule, a bar
chart that
reports in
separate
scales the
pKas of the DH
proton donors
and :A proton
acceptors most
frequently
involved in
DH···:A bond
formation.
Allowing the
two scales to
shift so to
bring selected
donor and
acceptor
molecules into
coincidence,
the ruler
permits
graphical
evaluation of
pKa and then
empirical
appreciation
of the DH···:A
bond strength
according to
the pKa
equalization
principle.
Reliability of
pKa slide rule
predictions
has been
verified by
extensive
comparison
with two
classical
sources of
H-bond
strengths: (i)
the gas-phase
dissociation
enthalpies of
charged
[X···H···X]
and
[X···H···X]+
bonds derived
from the
thermodynamic
NIST Database
and (ii) the
geometries of
more than 9500
H-bonds
retrieved from
the Cambridge
Structural
Database. The
results attest
that the pKa
slide rule
provides a
reliable
solution for
the
long-standing
problem of
H-bond-strengt
h prediction
and represents
an efficient
and practical
tool for
making such
predictions
directly
accessible to
all
scientists.Pao
la Gilli,
Loretta
Pretto,
Valerio
Bertolasi,
Gastone Gilli
Source: Acc. Chem. Res. (16 October 2008)
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