3,637 research outputs found
In vitro starch binding experiments: Study of the proteins related to grain hardness of wheat
Two friabilin components, puroindoline a and GSP-1 were expressed in Escherichia coli. Starch
binding properties of the recombinant polypeptides and of friabilin extracted from wheat flour were
compared in vitro. The produced proteins as well as native wheat friabilin bound to starch granules
prepared from different (soft, hard and durum) wheat cultivars. Starch granules also bound
specifically several wheat endosperm proteins other than friabilin
Normalizers of Primitive Permutation Groups
Let be a transitive normal subgroup of a permutation group of finite
degree . The factor group can be considered as a certain Galois group
and one would like to bound its size. One of the results of the paper is that
if is primitive unless , , , , or
. This bound is sharp when is prime. In fact, when is
primitive, unless is a member of a given infinite
sequence of primitive groups and is different from the previously listed
integers. Many other results of this flavor are established not only for
permutation groups but also for linear groups and Galois groups.Comment: 44 pages, grant numbers updated, referee's comments include
The Linear Boltzmann Equation as the Low Density Limit of a Random Schrodinger Equation
We study the evolution of a quantum particle interacting with a random
potential in the low density limit (Boltzmann-Grad). The phase space density of
the quantum evolution defined through the Husimi function converges weakly to a
linear Boltzmann equation with collision kernel given by the full quantum
scattering cross section.Comment: 74 pages, 4 figures, (Final version -- typos corrected
Recovering a spinning inspiralling compact binary waveform immersed in LIGO-like noise with spinning templates
We investigate the recovery chances of highly spinning waveforms immersed in
LIGO S5-like noise by performing a matched filtering with 10^6 randomly chosen
spinning waveforms generated with the LAL package. While the masses of the
compact binary are reasonably well recovered (slightly overestimated), the same
does not hold true for the spins. We show the best fit matches both in the
time-domain and the frequency-domain. These encompass some of the spinning
characteristics of the signal, but far less than what would be required to
identify the astrophysical parameters of the system. An improvement of the
matching method is necessary, though may be difficult due to the noisy signal.Comment: 5 pages, 1 figure + 4 figure panels; Proceedings of the Eight Edoardo
Amaldi Conference on Gravitational Waves (Amaldi8), New York, 2009; to be
published in J. Phys.: Conf. Series (JPCS
Report of review of St Stephen’s Children’s Centre, Newham: services for children aged up to 3 years
Formation of surface depressions is a significant geological hazard. Prediction of future sinkholes in
buried karstic areas needs knowledge about the subsurface. In order to determine the varying topography
of the karstifiable bedrock we carried out multielectrode measurements. Due to the hard field conditions,
the bedrock depth could not be detected. The resistivity anomalies in some places had a seasonal variation
(low-resistivity in springtime, high-resistivity in the end of summer); therefore we interpreted the
springtime resistivity lows as indicators of locations with high water content, that is as high porosity,
saturated with water. At the same time, when pushing the current- and potential electrodes into the ground,
we discovered a regularity in the areal distribution of the soil's rock debris content. Therefore we carried
out a systematic electrode-pricking experiment, and categorized the soil's "toughness" corresponding to
soft penetration, scratching or blockage within the upper 30 cm. We have found a close relationship
between the locations of resistivity- and the soil's toughness extremes. From some epikarstic features we
think that high "pricking probe" values indicate smaller depths of the bedrock. The corresponding
(springtime) resistivity minima may indirectly indicate more or less collapsed horsts of the carbonate rock
Secret Communication over Broadcast Erasure Channels with State-feedback
We consider a 1-to- communication scenario, where a source transmits
private messages to receivers through a broadcast erasure channel, and the
receivers feed back strictly causally and publicly their channel states after
each transmission. We explore the achievable rate region when we require that
the message to each receiver remains secret - in the information theoretical
sense - from all the other receivers. We characterize the capacity of secure
communication in all the cases where the capacity of the 1-to- communication
scenario without the requirement of security is known. As a special case, we
characterize the secret-message capacity of a single receiver point-to-point
erasure channel with public state-feedback in the presence of a passive
eavesdropper.
We find that in all cases where we have an exact characterization, we can
achieve the capacity by using linear complexity two-phase schemes: in the first
phase we create appropriate secret keys, and in the second phase we use them to
encrypt each message. We find that the amount of key we need is smaller than
the size of the message, and equal to the amount of encrypted message the
potential eavesdroppers jointly collect. Moreover, we prove that a dishonest
receiver that provides deceptive feedback cannot diminish the rate experienced
by the honest receivers.
We also develop a converse proof which reflects the two-phase structure of
our achievability scheme. As a side result, our technique leads to a new outer
bound proof for the non-secure communication problem
AFLP analysis and improved phytoextraction capacity of transgenic gshI-poplar clones (Populus canescens L.) in vitro
Clone stability and in vitro phytoextraction capacity of
vegetative clones of R x canescens (2n = 4x = 38) including two
transgenic clones (ggs11 and lgl6) were studied as in vitro leaf
disc cultures. Presence of the gshI-transgene in the transformed
clones was detected in PCR reactions using gshI-specific
primers. Clone stability was determined by fAFLP (fluorescent
amplified DNA fragment length polymorphism) analysis. In total,
682 AFLP fragments were identified generated by twelve selective
primer pairs after EcoRI-MseI digestion. Four fragments
generated by EcoAGT-MseCCC were different (99.4% genetic
similarity) which proves an unexpectedly low bud mutation
frequency in R x canescens. For the study of phytoextraction
capacity leaf discs (8 mm) were exposed to a concentration
series of ZnSO4 (10(-1) to 10(-5) m) incubated for 21 days on
aseptic tissue culture media WPM containing 1 mu m Cu. Zn2+
caused phytotoxicity only at high concentrations (10(-1) to 10(-
2) m). The transgenic poplar cyt-ECS (ggs11) clone, as
stimulated by the presence of Zn, showed elevated heavy metal
(Cu) uptake as compared to the non-transformed clone. These
results suggest that gshI-transgenic poplars may be suitable for
phytoremediation of soils contaminated with zinc and copper
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