on the computational complexity of networks of spiking neurons
Báo cáo khoa học: "On the Computational Complexity of Dominance Links in Grammatical Formalisms" doc
Ngày tải lên :
16/03/2014, 23:20
... Proceedings of the 48th Annual Meeting of the Association for Computational Linguistics, pages 514–524,
Uppsala, Sweden, 11-16 July 2010.
c
2010 Association for Computational Linguistics
On the Computational ... e
3
) = 0.
Extensions The subsumption of Petri nets is not
innocuous, as it allows to derive lower bounds on
the computational complexity of MLIGs. Among
several extensions of Petri net with ... in the second vector has to spawn even-
tually one occurrence of each S → aS, S → bS,
and S → cS, which corresponds exactly to the
MLIG of Example 2.
The ease of translation from the grammar of
Figure...
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Báo cáo khoa học: "THE COMPUTATIONAL COMPLEXITY OF AVOIDING CONVERSATIONAL IMPLICATURES" pdf
Ngày tải lên :
17/03/2014, 20:20
... this context, it requires refer-
ring expressions to be factual descriptions of the
referred-to object. This condition is already part of
the definition of a successful referring expression, ... let N be the number of components
that are potentially useful in a description, i.e., the
number of members of
Target-Components
that rule
out at least one member of
Excluded. The
straight- ... be done in
polynomial time if the number of minimal sets is
polynomial in the length of the description, which
will happen if (non-zero) upper and lower bounds are
placed on the length of...
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Báo cáo " Study on the characteristics and catalytic properties of Pt/SBA-15 in the selective oxidation of D-Glucose " potx
Ngày tải lên :
05/03/2014, 11:21
... image of the products of
D-glucose oxidation on PS-1 catalyst
On the other hand, the reaction on Pt/SBA-
15 catalysts with pH control not only showed a
high conversion, but also high D-gluconic ... 183-190
189
- From the results above, we found that both
HNO
3
and Pt/SBA-15 present a good
conversion in the oxidation reaction of glucose.
The conversion of the reaction reached 87.67%
when ...
of plantinum nanoparticles in the selective
oxidation of glucose. When the reaction was
performed without pH control on PS-1 catalyst,
the conversion decreased significantly. The pH
at the...
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Báo cáo khoa học: Retrocyclin RC-101 overcomes cationic mutations on the heptad repeat 2 region of HIV-1 gp41 ppt
Ngày tải lên :
07/03/2014, 05:20
... coincide with the
region that binds HR1 upon 6HB formation. The
strong affinity of RC-101 for HR2 prevents the inter-
action of HR1 and HR2, formation of the 6HB, and
subsequent fusion of the host ... RC-101. In the context
of computational data, the HR1 ⁄ HR2 nomenclature refers
only to the N36 and C34 peptides, respectively. Three-
dimensional structural models of the HR1 and HR2 regions
of JR.FL ... regions of
gp41 [12]. During 100 days of serial passaging, HIV-1
strain BaL developed three cationic mutations in the
presence of sublethal concentrations of RC-101 [14]. Of
the three mutations,...
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Báo cáo khoa học: Context-dependent effects of proline residues on the stability and folding pathway of ubiquitin docx
Ngày tải lên :
07/03/2014, 16:20
... substitutions imposed on the
backbone conformation of WT* shows that the pattern of
P37
P38
P19
W45
Fig. 1. Ribbon structure modelled on the X-ray structure of human
ubiquitin [32]. The position and ... solution of native protein was
unfolded by a 1 : 10 dilution to yield final concentrations
of GdmCl near or above the midpoint of the equilibrium
unfolding transition (concentrations of GdmCl in the
range ... that the reduction in stability of these
mutants is largely manifested in perturbations to the
unfolding rates with the degree of compactness of the
TSE (a
D
) and linearity of the chevron plots...
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Báo cáo khoa học: Effects of salt on the kinetics and thermodynamic stability of endonuclease I from Vibrio salmonicida and Vibrio cholerae potx
Ngày tải lên :
16/03/2014, 06:20
... study, the effect of NaCl concentration on
the kinetic constants and thermodynamic stability of
VsEndA and VcEndA was investigated. In addition,
the effects of reciprocal mutations of two non-con-
served ... boundary conditions,
and the resulting grid was adopted as the boundary condi-
tion for one further focused calculation. The protein mole-
cules occupied 90% of the box in the final calculations. The
molecular ... activity conditions of
the native enzymes [11]. The denaturation peaks were
symmetrical, except for some exothermic distortion
of the thermograms after the denaturation peak,
especially in the VcEndA...
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Báo cáo khoa học: Isothermal unfolding studies on the apo and holo forms of Plasmodium falciparum acyl carrier protein Role of the 4¢-phosphopantetheine group in the stability of the holo form of Plasmodium falciparum acyl carrier protein docx
Ngày tải lên :
16/03/2014, 10:20
... iden-
tified as the major and the minor forms of the holo-
ACP structure, on the basis of their percentage contri-
butions (65% and 35%, respectively) to the overall
structure of the protein. The structures ... against the fraction number (AU, arbitrary unit). (d) The apparent molecular masses of apo-ACP and holo-ACP were estimated on
the basis of the linear regression of the fraction number of the molecular ... elucidates the interactions respon-
sible for the conformational stability of PfACP.
The size exclusion chromatography profile of PfACP
showed that the apparent molecular mass of PfACP
monomer is...
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Báo cáo khoa học: Effects of cardiomyopathic mutations on the biochemical and biophysical properties of the human a-tropomyosin docx
Ngày tải lên :
16/03/2014, 18:20
... assayed by varying the concen-
tration of Tm in the presence of constant concentration of
F-actin and myosin S1. In this condition, Tm inh ibits the
ATPase activity as its concentration increases [33]. ... stability of the protein as a whole, rather
than on the position of the mutation in the polypeptide chain,
as demonstrated by the biophysical assays. Our studies h ave
provided additional contributions ... f the mutant Tms.
The mutations d id not affect the structure of the protein
as there was no significant alteration in the f unction or in the
amount of th e s econdary s tructure. However, the...
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influence of binders on the sensing and electrical characteristics of wo3-based gas sensors
Ngày tải lên :
20/03/2014, 13:04
... semiconductor, electron transfer occurs
between the semiconductor and the adsorbates. If the
electron affinity of the adsorbates is larger than the work
function of the n-type semiconductor, the ... characteristics of WO film mostly through the chemi-
3
cal nature of GB rather than the modification of physical
properties of polycrystals.
5. Conclusion
The origin of binder effects on the sensing ... than the exponential one since the
desorption effect adds on the exponential temperature de-
Ž.
pendence given by Eq. 5 . But the decrease of film
resistance is faster than the exponential one only...
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Báo cáo "Effects of Zn content on the magnetic and magnetocaloric properties of Ni-Zn ferrites " pdf
Ngày tải lên :
22/03/2014, 11:20
... lattice constant and volume of unit cell increase with Zn content
in the samples due to larger ionic radius of Zn
2+
ion (0.82 Å) substituted for Ni
2+
ion (0.78 Å).
The X-ray density, the real ...
Exchange interactions between magnetic ions through oxygen ion are superexchange interaction
with antiferromagnetic nature. These interactions depend on bond distance and bond length. Normally ... each other below the freezing temperature T
f
indicating the
onset of blocking of clusters. The sample settles into the frozen state below temperature T
f
. This
behavior is attributed to the...
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Báo cáo khoa học: The ‘pair of sugar tongs’ site on the non-catalytic domain C of barley a-amylase participates in substrate binding and activity potx
Ngày tải lên :
23/03/2014, 07:20
... with the
reduced DMA of the AMY1 Y380A ‘sugar tongs’
mutant, these effects may stem from allosteric regula-
tion.
The mutational analysis of the ‘sugar tongs’ in barley
AMY1 explored the role of ... This
is the first demonstration of a function for a C domain
from the large GH clan-H. The work contributes to the
unraveling of the molecular basis of multivalent
enzyme–polysaccharide interactions. ... connects b5 and a5 of the catalytic (b ⁄ a)
8
-barrel
at the end of the aglycon-binding area of the active site
cleft. Earlier, significant deviation was found in this
region between the backbone...
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Báo cáo khoa học: Salicylic acid and the hypersensitive response initiate distinct signal transduction pathways in tobacco that converge on the as-1-like element of the PR-1a promoter pot
Ngày tải lên :
23/03/2014, 15:21
... zone 1 (lanes 1,3,5,7) included necrotic
tissue from the lesions, whereas leaf material of zone 2 was collected in
a region 7–14 mm away from the center of the lesions. Due to the
expansion of ... host response depending on the genetic constitution
of the plant and the pathogen. In an incompatible inter-
action, the pathogen remains localized at the primary
infection sites that often are ... collected from a narrow
zone including the lesion and from a more distant zone
around single lesions of each plant. Whereas samples from
the distant zone of control plants never contained necrotic
leaf...
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THE EXPOSURE OF YOUTH TO UNWANTED SEXUAL MATERIAL ON THE INTERNET: A National Survey of Risk, Impact, and Prevention pdf
Ngày tải lên :
29/03/2014, 19:20
... supportive of different contentions about harm, depending
on the emphasis one chooses to give them. On one hand, it is clear
from their reactions that the majority of youth regard their personal
unwanted ... to
confirm a causal relationship.)
On the other hand, one of the cautionary findings is that despite its
ability to decrease exposure, the software seems far from foolproof.
At least 18% of the ... av
-
erage of 24% of the health information and 91% of the pornography.
Although such studies show possible weaknesses in the software ap
-
proach, they do not address the question of how the programs...
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Báo cáo khoa học: Effects of sphingomyelin, cholesterol and zinc ions on the binding, insertion and aggregation of the amyloid Ab1)40 peptide in solid-supported lipid bilayers ppt
Ngày tải lên :
30/03/2014, 11:20
... obtained for the bilayer
in the presence of 1 m
M Zn ions, as a function of time, after the addition of A b (5 lM bulk concentration in the sample cell). Initial binding
occurred mainly in the SM-rich ... facilitate peptide penetration
of the hydrocarbon core of the membrane and subse-
quent aggregation [22,37]. In order to test the effect of
zinc addition in the present experiments on peptide
binding ... without loss of bilayer integrity. A structural interpretation
of peptide interaction with the bilayer is presented based on the results of
simulation analysis of the PWR spectra.
Abbreviations
Ab,...
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