7,837 research outputs found
De novo characterization of Lycoris sprengeri transcriptome using Illumina GA II
The Illumina GA II high-throughput sequencing technology was used to establish a transcriptome library from the bulbs of Lycoris sprengeri. A total of 24 million short read with an average length of 90 nt were generated, which produced 98,150 unigenes with a mean length of 385 nt. A total of 45.9% of these unigenes (45,052) were annotated using BLAST (E-value 1.0E-5) against the nr, SwissProt, Kyoto encyclopedia of genes and genomes (KEGG) and Clusters of orthologous groups (COG) databases. The unigenes were annotated with gene ontology (GO) and COG. Of these, 2,173 unigenes were found to be related to carbohydrate metabolism, and 544 were involved in starch and sucrose metabolism.Key words: Lycoris sprengeri, Illumina GA II, transcriptome, carbohydrate metabolism
DAIDZEIN: A REVIEW OF PHARMACOLOGICAL EFFECTS
Background: Daidzein is an isoflavone with extensive nutritious value and is mainly extracted from soy plants. It is also called phytoestrogen due to its structural similarity to the human hormone estrogen. However, daidzein is distinct from estrogen due to the specificity of the estrogen receptor (ER) complex. In recent years, the pharmacological properties of daidzein have been extensively investigated and considerable progress has been made. The present review aims to evaluate the pharmacological effects and mechanisms of daidzein as reported in scientific literature.
Materials and Methods: Studies were identified as reported in PubMed, Elsevier, Scholar, and Springer over the last ten years and this resulted in the identification of 112 papers.
Results: Daidzein is reported to play a significant role in the prevention and treatment of a variety of diseases such as cancer, cardiovascular disease, diabetes, osteoporosis, skin disease, and neurodegenerative disease. This pharmacological activity is attributed to various metabolites including equol and trihydroxy isoflavone.
Conclusion: Daidzein appears to play a significant role in the prevention of a variety of diseases and has the potential of being used in a clinical setting. However, further research is needed to understand its molecular mechanisms and safety for use in humans.
Keywords: Plant, natural product, phytoestrogen, pharmacolog
Raman Spectroscopy Study of alpha-, beta-, gamma-NaxCoO2 and gamma-(Ca,Sr)xCoO2
Raman spectroscopy measurements have been performed on alpha-, beta-,
gamma-NaxCoO2 phases differing in their stacking of CoO6 octahedra along the
c-axis direction. The results demonstrate that, in general, there are five
active phonons for gamma-Na0.75CoO2, two Raman active phonons for alpha-NaCoO2,
and four Raman active phonons for beta-NaCoO2. We have also performed Raman
scattering measurements on several gamma-(Ca,Sr)xCoO2 (0.15 <= x <= 0.35)
samples which show well-defined intercalated Ca/Sr-ordering. The experimental
data show that the intercalated cation ordering could result in visible
alterations on Raman spectral structures. The observations of the spectral
changes along with the variation of the CoO6 stacking, as well as the
intercalated Sr/Ca ordering suggest that the interlayer interaction plays an
important role for understanding the lattice dynamics in this layered system.Comment: 23 pages, 5 figures, Physical Review B, in pres
Simulation studies for dielectric wakefield programme at CLARA facility
Short, high charge electron bunches can drive high magnitude electric fields
in dielectric lined structures. The interaction of the electron bunch with this
field has several applications including high gradient dielectric wakefield
acceleration (DWA) and passive beam manipulation. The simulations presented
provide a prelude to the commencement of an experimental DWA programme at the
CLARA accelerator at Daresbury Laboratory. The key goals of this program are:
tunable generation of THz radiation, understanding of the impact of transverse
wakes, and design of a dechirper for the CLARA FEL. Computations of
longitudinal and transverse phase space evolution were made with Impact-T and
VSim to support both of these goals.Comment: 10 Pages, 4 Figures, Proceedings of EAAC2017 Conferenc
Approximate perturbed direct homotopy reduction method: infinite series reductions to two perturbed mKdV equations
An approximate perturbed direct homotopy reduction method is proposed and
applied to two perturbed modified Korteweg-de Vries (mKdV) equations with
fourth order dispersion and second order dissipation. The similarity reduction
equations are derived to arbitrary orders. The method is valid not only for
single soliton solution but also for the Painlev\'e II waves and periodic waves
expressed by Jacobi elliptic functions for both fourth order dispersion and
second order dissipation. The method is valid also for strong perturbations.Comment: 8 pages, 1 figur
Laser spectroscopy using beam-overlap modulation
A new Doppler-free laser spectroscopy method is demonstrated that employs modulation of the position of a laser beam rather than the commonly used intensity or polarization modulation. The technique is applicable in saturated absorption as well as fluorescence measurements, as is illustrated in experiments on sodium and iodine lines. A particular feature of the method is that Doppler- and background-free fluorescence spectra can be recorded without using intermodulation techniques
Quantum spin pumping mediated by magnon
We theoretically propose quantum spin pumping mediated by magnons, under a
time-dependent transverse magnetic field, at the interface between a
ferromagnetic insulator and a non-magnetic metal. The generation of a spin
current under a thermal equilibrium condition is discussed by calculating the
spin transfer torque, which breaks the spin conservation law for conduction
electrons and operates the coherent magnon state. Localized spins lose spin
angular momentum by emitting magnons and conduction electrons flip from down to
up by absorbing the momentum. The spin transfer torque has a resonance
structure as a function of the angular frequency of the applied transverse
field. This fact is useful to enhance the spin pumping effect induced by
quantum fluctuations. We also discuss the distinction between our quantum spin
pumping theory and the one proposed by Tserkovnyak et al.Comment: 27 pages, 2 figures. v2; the detail of the calculation has been added
in Appendix. The distinction from the spin pumping theory proposed by
Tserkovnyak et al. has been clarified in section 5. v3; typos correcte
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