862 research outputs found
A Note on the use of Ethnomedicine in Treatment of Diabetes by Mishing Communities in Assam, India
Ethnomedicinal field surveys were conducted in several places of Sonitpur district and near by areas of Lakhimpur district in Assam, where diverse ethnic groups have lived since time immemorial. The ethnic groups have very rich tradition of herbal medicines used in the treatment of various ailments. Among the tribal communities, Mishings constitute the largest group along with Bodos. The ethnomedicinal information was collected on the basis of interview and field studies with local healers among those communities. Medicinal plants were collected and identified with help from indigenous healers. Such medicines have been shown to have significant healing power, either in their natural state or as the source of new products processed by them. Generally these formulations of crude products are considered moderate in efficacy and thus less toxic than most pharmaceutical agents. Our study is mainly concentrated with plants used in relation to cure of diabetes. In our report, detailed notes on the method of preparation, precise dosage, the part/parts of plants used and method of application is given. Scientific name, vernacular names and family names of the collected plants are also given in this report
Intermittent jet activity in the radio galaxy 4C29.30?
We present radio observations at frequencies ranging from 240 to 8460 MHz of
the radio galaxy 4C29.30 (J0840+2949) using the Giant Metrewave Radio Telescope
(GMRT), the Very Large Array (VLA) and the Effelsberg telescope. We report the
existence of weak extended emission with an angular size of 520 arcsec
(639 kpc) within which a compact edge-brightened double-lobed source with a
size of 29 arcsec (36 kpc) is embedded. We determine the spectrum of the inner
double from 240 to 8460 MHz and show that it has a single power-law spectrum
with a spectral index of 0.8. Its spectral age is estimated to be
\lapp33 Myr. The extended diffuse emission has a steep spectrum with a
spectral index of 1.3 and a break frequency \lapp240 MHz. The spectral
age is \gapp200 Myr, suggesting that the extended diffuse emission is due to
an earlier cycle of activity. We reanalyse archival x-ray data from Chandra and
suggest that the x-ray emission from the hotspots consists of a mixture of
nonthermal and thermal components, the latter being possibly due to gas which
is shock heated by the jets from the host galaxy.Comment: 14 pages, 11 figures, accepted for publication in MNRA
PUBLIC KEY CRYPTOGRAPHY USING PERMUTATION P-POLYNOMIALS OVER FINITE FIELDS
In this paper we propose an efficient multivariate
public key cryptosystem based on permutation p-polynomials over
finite fields. We first characterize a class of permutation
p-polynomials over finite fields and then construct a
trapdoor function using this class of permutation p-polynomials.
The complexity of encryption in our public key cryptosystem is
multiplication which is equivalent to other
multivariate public key cryptosystems. However the decryption is
much faster than other multivariate public key cryptosystems. In
decryption we need left cyclic shifts and
xor operations
Poly-Dragon: An efficient Multivariate Public Key Cryptosystem
In this paper we propose an efficient multivariate
public key cryptosystem. Public key of our cryptosystem contains polynomials of total degree three in plaintext and ciphertext variables, two in plaintext variables and one in ciphertext variables. However, it is possible to reduce the public key size by writing it as two sets of quadratic multivariate polynomials. The complexity of encryption in our public key cryptosystem is , where is bit size, which is equivalent to other multivariate
public key cryptosystems. For decryption we need only four exponentiations in the binary field. Our Public key algorithm is bijective and can be used for encryption as well as for signatures
Planetary Probe Entry Models for Concurrent and Integrated Interplanetary Mission Design
There are many prospective mission opportunities involving atmospheric entry probes. The Planetary Science Deep Space SmallSat Studies (PSDS3) re-cently selected probe missions to Venus, Mars, and the outer planets as part of the 10 selected studies. Two of the six themes in the most recent New Fron-tiers call were a Saturn probe and a Venus in situ explorer. The 2013-2022 Planetary Science Decadal Survey includes probe missions at Venus, Mars, Saturn, Titan, Uranus, and Neptune. Across mission destinations and mission classes there is growing interest in planetary probes. While interplanetary trajectory specialists may like to use a broad sweep of low-fidelity solutions to find a wide array of trajectory options, probe specialists typically start off with mid- to high-fidelity point designs for the entry probe since the equations of motion for atmospheric probes require numerical integration and are so directly linked with some of the probe's subsystem design. Cur-rently, there are no alternatives to this design ap-proach as there are no tools capable of automatical-ly and concurrently designing interplanetary and atmospheric trajectories. Unfortunately, this makes us reliant on point designs in the early stages of the mission design process. The reliance on point de-signs for atmospheric probes hinders the flexibility of the design, making the design process cumber-some and restricting decision-making down the road. The research presented here addresses this problem by providing low-fidelity models for the automated, rapid design of atmospheric trajectories and probe's models which may be solved concur-rently with the interplanetary trajectory
A survey of extended radio jets with Chandra and HST
We present the results from an X-ray and optical survey of a sample of 17
radio jets in AGN performed with Chandra and HST. The sample was selected from
the radio and is unbiased toward detection at shorter wavelengths, but
preferentially it includes beamed sources. We find that X-ray emission is
common on kpc-scales, with over half radio jets exhibiting at least one X-ray
knot on the Chandra images. The distributions of the radio-to-X-ray and
radio-to-optical spectral indices for the detected jets are similar to the
limits for the non-detections,suggesting all bright radio jets have X-ray
counterparts which will be visible in longer observations. Comparing the radio
and X-ray morphologies shows that the majority of the X-ray jets have
structures that closely map the radio. Analysis of the SED of the jet knots
suggest the knots in which the X-ray and radio morphologies track each other
produce X-rays by IC scattering of the Cosmic Microwave Background. The
remaining knots produce X-rays by the synchrotron process. Spectral changes are
detected along the jets, with the ratio of the X-ray-to-radio and
optical-to-radio flux densities decreasing from the inner to the outer regions.
This suggests the presence of an additional contribution to the X-ray flux in
the jet's inner part, either from synchrotron or IC of the stellar light.
Alternatively, in a pure IC/CMB scenario, the plasma decelerates as it flows
from the inner to the outer regions. Finally, the X-ray spectral indices for
the brightest knots are flat, indicating that the bulk of the luminosity of the
jets is emitted at GeV energies, and raising the interesting possibility of
future detections with GLAST.Comment: 26 pages, 6 ps figures, 6 jpeg figures (1 replaced); accepted for
publication in Ap
Examining the Seyfert - Starburst Connection with Arcsecond Resolution Radio Continuum Observations
We compare the arcsecond-scale circumnuclear radio continuum properties
between five Seyfert and five starburst galaxies, concentrating on the search
for any structures that could imply a spatial or causal connection between the
nuclear activity and a circumnuclear starburst ring. No evidence is found in
the radio emission for a link between the triggering or feeding of nuclear
activity and the properties of circumnuclear star formation. Conversely, there
is no clear evidence of nuclear outflows or jets triggering activity in the
circumnuclear rings of star formation. Interestingly, the difference in the
angle between the apparent orientation of the most elongated radio emission and
the orientation of the major axis of the galaxy is on average larger in
Seyferts than in starburst galaxies, and Seyferts appear to have a larger
physical size scale of the circumnuclear radio continuum emission. The
concentration, asymmetry, and clumpiness parameters of radio continuum emission
in Seyferts and starbursts are comparable, as are the radial profiles of radio
continuum and near-infrared line emission. The circumnuclear star formation and
supernova rates do not depend on the level of nuclear activity. The radio
emission usually traces the near-infrared Br-gamma and H2 1-0 S(1) line
emission on large spatial scales, but locally their distributions are
different, most likely because of the effects of varying local magnetic fields
and dust absorption and scattering.Comment: 21 pages, 10 figures. Accepted for publication in the Astronomical
Journa
Genetic and functional diversity among the antagonistic potential fluorescent Pseudomonada isolated from tea rhizosphere
Twenty-five fluorescent pseudomonads from
rhizospheric soil of six tea gardens in four district of Upper
Assam, India were isolated and screened for antagonistic
activity against fungal pathogens such as Fusarium oxysporum
f. sp. raphani (For), Fusarium oxysporum f. sp. ciceri
(Foc), Fusarium semitectum (Fs), and Rhizoctonia solani
(Rs); and bacterial pathogens 14Staphylococcus aureus
(Sa), Escherichia coli (Ec), and Klebsiella pneumoniae
(Kp). Most of the isolates exhibited strong antagonistic
activity against the fungal pathogens and gram-positive
bacterium i.e. Staphylococcus aureus. Productions of siderophore,
salicylic acid (SA), hydrogen cyanide (HCN),
and cell wall-degrading enzyme (chitinase) were studied to
observe the possible mechanisms of antagonistic activity of
the isolates. Correlation between the antagonistic potentiality
of some isolates and their levels of production of
siderophore, salicylic acid, and hydrogen cyanide was
observed. Out of the 25 isolates, antibiotic-coding genes,
2,4-diacetylphloroglucinol (DAPG) and pyoluteorin (PLT)
were detected in the isolates, Pf12 and Pf373, respectively.
Genetic diversity of these fluorescent pseudomonads were
analyzed with reference to four strains of Pseudomonas
fluorescens NICM 2099T, P. aeruginosa MTCC 2582T,
P. aureofaciens NICM 2026T, and P. syringae MTCC 673T.
16S rDNA-RFLP analysis of these isolates using three tetra
cutter restriction enzymes (HaeIII, AluI and MspI) revealed
two distinct clusters. Cluster A comprised only two isolates
Pf141 and 24-PfM3, and cluster B comprised 23 isolates
along with four reference strains
Regge behaviour of distribution functions and t and x-evolutions of gluon distribution function at low-x
In this paper t and x-evolutions of gluon distribution function from
Dokshitzer-Gribov-Lipatov-Altarelli-Parisi(DGLAP) evolution equation in leading
order(LO) at low-x, assuming the Regge behaviour of quark and gluon at this
limit, are presented. We compare our results of gluon distribution function
with MRST 2001, MRST 2004 and GRV '98 parameterizations and show the
compatibility of Regge behaviour of quark and gluon distribution functions with
perturbative quantum chromodynamics(PQCD) at low-x. We also discuss the
limitations of Taylor series expansion method used earlier to solve DGLAP
evolution equations, in the Regge behaviour of distribution functions.Comment: 19 pages, 7 figure
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