707 research outputs found
Improving the performance of inorganic-organic hybrid photovoltaic devices by uniform ordering of ZnO nanorods and near-atmospheric pressure nitrogen plasma treatment
Origin of negative differential resistance in molecular junctions of Rose Bengal
Negative differential resistance (NDR) is tuned at junctions of
electronically different dimer and trimer of Rose Bengal on an atomic flat gold
(111) surface. Isolated molecule did not show any NDR. But it was induced to
show double NDR with large peak to valley ratio (1.8~3.1) in room temperature
via charging its neighbor reproducibly by an electrical pulse. In some sections
of junction by applying pulse one could destroy the phenomenon or regenerate it
by STM manipulation of molecules. NDR was also independent of polaronic nature.
It was possible to write bits 1 and 0 for cationic NDR (in dimer) and 00, 01,
10, 11 for di-anionic NDR (trimer) which generated 2/4 bit memory in a atomic
scale junction showing importance of junction electronics in future of
moletronics.Comment: 14 pages, 3 figures, communicate
Thermoelectric properties of a weakly coupled quantum dot: enhanced thermoelectric efficiency
We study the thermoelectric coefficients of a multi-level quantum dot (QD)
weakly coupled to two electron reservoirs in the Coulomb blockade regime.
Detailed calculations and analytical expressions of the power factor and the
figure of merit are presented. We restrict our interest to the limit where the
energy separation between successive energy levels is much larger than the
thermal energy (i.e., the quantum limit) and we report a giant enhancement of
the figure of merit due to the violation of the Wiedemann-Franz law when
phonons are frozen. We point out the similarity of the electronic and the
phonon contribution to the thermal conductance for zero dimensional electrons
and phonons. Both contributions show an activated behavior. Our findings
suggest that the control of the electron and phonon confinement effects can
lead to nanostructures with improved thermoelectric properties.Comment: 8 pages, 6 figure
Introduction of mitochondrial DNA from Pleurotus ostreatus into Pleurotus pulmonarius by interspecific protoplast fusion
The original publication is available at www.springerllink.com.ArticleJournal of Wood Science. 53(4):339-343 (2007)journal articl
Integral representations of q-analogues of the Hurwitz zeta function
Two integral representations of q-analogues of the Hurwitz zeta function are
established. Each integral representation allows us to obtain an analytic
continuation including also a full description of poles and special values at
non-positive integers of the q-analogue of the Hurwitz zeta function, and to
study the classical limit of this q-analogue. All the discussion developed here
is entirely different from the previous work in [4]Comment: 14 page
Hierarchy of the Selberg zeta functions
We introduce a Selberg type zeta function of two variables which interpolates
several higher Selberg zeta functions. The analytic continuation, the
functional equation and the determinant expression of this function via the
Laplacian on a Riemann surface are obtained.Comment: 14 page
2048-QAM transmission at 15 GBd over 100 km using geometric constellation shaping
We experimentally investigated a pilot-aided digital signal processing (DSP) chain in combination with high-order geometric constellation shaping to increase the achievable information rates (AIRs) in standard intradyne coherent transmission systems. We show that the AIR of our system at 15 GBd was maximised using geometrically-shaped (GS) 2048 quadrature amplitude modulation (QAM), reaching 18.0 b/4D-symbol in back-to-back transmission and 16.9 b/4D-symbol after transmission through 100 km of a single-mode fibre after subtracting the pilot overhead (OH). This represents the highest-order GS format demonstrated to date, supporting the highest AIR of any standard intradyne system using conventional optics and 8-bit electronics. Detailed characterisation of the DSP, transceiver performance, and transmission modelling has also been carried out to provide insight into sources of impairments and directions for further improvement
Towards Gradient-Based Design Optimization of Flexible Transport Aircraft with Flutter Constraints
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/140443/1/6.2014-2726.pd
Expression and Localization of the Cell Adhesion Molecule SgIGSF during Regeneration of the Olfactory Epithelium in Mice
Spermatogenic immunoglobulin superfamily (SgIGSF) is a cell adhesion molecule originally discovered in mouse testis. SgIGSF is expressed not only in spermatogenic cells but also in lung and liver epithelial cells and in neurons and glia of the central and peripheral nervous systems. In the present study, we examined the expression and localization of SgIGSF in mouse olfactory epithelium before and after transection of the olfactory nerves, by RT-PCR, Western blotting and immunohistochemistry. In normal olfactory mucosa, SgIGSF showed 100 kDa in molecular weight, which was identical with that in the lung but different from that in the brain. SgIGSF was expressed on the membrane of all olfactory, sustentacular and basal cells, but more abundantly in the apical portions of the olfactory epithelium where the dendrites of olfactory cells are in contact with sustentacular cells. After olfactory nerve transection, mature olfactory cells disappeared in 4 days but were regenerated around 7–15 days by proliferation and differentiation of basal cells into mature olfactory cells through the step of immature olfactory cells. During this period, both the mRNA and protein for SgIGSF showed a transient increase, with peak levels at 7 days and 11 days, respectively, after the transection. Immunohistochemistry showed that the enriched immunoreactivity for SgIGSF at 7–11 days was localized primarily to the membrane of immature olfactory cells. These results suggested that, during regeneration of the olfactory epithelium, the adhesion molecule SgIGSF plays physiological roles in differentiation, migration, and maturation of immature olfactory cells
A Time- and Cost-Saving Method of Producing Rat Polyclonal Antibodies
Producing antibodies usually takes more than three months. In the present study, we introduce a faster way of producing polyclonal antibodies based on preparation of the recombinant oligopeptide as antigen followed by immunization of rats. Using this method, we produced antisera against two mouse proteins: ERGIC-53 and c-Kit. An expression vector ligated with a pair of complementary synthetic oligodeoxyribonucleotides encoding the protein was introduced into bacteria, and the recombinant oligopeptide fused with the carrier protein glutathione-S-transferase was purified. Wistar rats were immunized by injecting the emulsified antigen subcutaneously into the hind footpads, followed by a booster injection Âafter 2 weeks. One week after the booster, the sera were collected and examined for the antibody titer by immunohistochemistry. Antisera with 1600-fold titer at the maximum were obtained for both antigens and confirmed for their specificity by Western blotting. Anti-ÂERGIC-53 antisera recognized acinar cells in the sublingual gland, and anti-c-Kit antisera recognized spermatogenic and Leydig cells in the testis. These antisera were applicable to fluorescent double immunostaining with mouse monoclonal or rabbit polyclonal antibodies. Consequently, this method enabled us to produce specific rat polyclonal antisera available for immunohistochemistry in less than one month at a relatively low cost
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