908 research outputs found
Shape-induced phenomena in the finite size antiferromagnets
It is of common knowledge that the direction of easy axis in the finite-size
ferromagnetic sample is controlled by its shape. In the present paper we show
that a similar phenomenon should be observed in the compensated
antiferromagnets with strong magnetoelastic coupling. Destressing energy which
originates from the long-range magnetoelastic forces is analogous to
demagnetization energy in ferromagnetic materials and is responsible for the
formation of equilibrium domain structure and anisotropy of macroscopic
magnetic properties. In particular, crystal shape may be a source of additional
uniaxial magnetic anisotropy which removes degeneracy of antiferromagnetic
vector or artificial 4th order anisotropy in the case of a square cross-section
sample. In a special case of antiferromagnetic nanopillars shape-induced
anisotropy can be substantially enhanced due to lattice mismatch with the
substrate. These effects can be detected by the magnetic rotational torque and
antiferromagnetic resonance measurements.Comment: 7 pages, 5 figures, to appear in Phys. Rev. B, v.75, N17, 200
A class of exponential chain ratio-product type estimators with two auxiliary variables under double sampling scheme
In this paper an exponential chain ratio-product-type estimators in double sampling has been developed using information on two supplementary characters for estimating the finite population mean. The optimum property of the suggested strategy has been studied. Comparisons of the efficiency of the proposed estimator under the optimality condition with other estimators have been presented through empirical investigations
Humoral and protective response of Indian major carps to immersion vaccination with Aeromonas hydrophila
Fry of the Indian major carps, Catta catla (Ham.), Labeo rohita (Ham.) and Cirrhinus mrigala (Ham.) were immunized at 4 and 8 weeks post hatching (wph) by direct immersion in a suspension (10 super(8) cells ml super(-1))of heat inactivated Aeromonas hydrophila. Following the same procedure, booster dose was administered 20 days after the first immersion. Antibodies as well as protective response produced in both the groups after the first and the booster immersion were different and significant (P<0.05). No significant difference was found between the species in the two age groups. The specimens immunized 8 wph showed higher antibody titres and protection than the 4 wph group. C. catla had higher relative percent survival followed by L. rohita and C. mrigala
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Resolving dichotomy in compact objects through continuous gravitational waves observation
More than two dozen soft gamma-ray repeaters (SGRs) and anomalous X-ray
pulsars (AXPs) have been detected so far. These are isolated compact objects.
Many of them are either found to be associated with supernova remnants or their
surface magnetic fields are directly measured, confirming that they are neutron
stars (NSs). However, it has been argued that some SGRs and AXPs are highly
magnetized white dwarfs (WDs). Meanwhile, the existence of super-Chandrasekhar
WDs has remained to be a puzzle. However, not even a single such massive WD has
been observed directly. Moreover, some WD pulsars are detected in
electromagnetic surveys and some of their masses are still not confirmed. Here
we calculate the signal-to-noise ratio for all these objects, considering
different magnetic field configurations and thereby estimate the required time
for their detection by various gravitational wave (GW) detectors. For SGRs and
AXPs, we show that, if these are NSs, they can hardly be detected by any of the
GW detectors, while if they are WDs, Big Bang Observer (BBO), DECi-hertz
Interferometer Gravitational wave Observatory (DECIGO) and Advanced Laser
Interferometer Antenna (ALIA) would be able to detect them within a few days to
a year of integration, depending on the magnetic field strength and its
configuration. Similarly, if a super-Chandrasekhar WD has a dominant toroidal
field, we show that even Laser Interferometer Space Antenna (LISA) and TianQin
would be able to detect it within one year of integration. We also discuss how
GWs can confirm the masses of the WD pulsars
Disaggregation of Amylin Aggregate by Novel Conformationally Restricted Aminobenzoic Acid containing α/β and α/γ Hybrid Peptidomimetics
Diabetes has emerged as a threat to the current world. More than ninety five per cent of all the diabetic population has type 2 diabetes mellitus (T2DM). Aggregates of Amylin hormone, which is co-secreted with insulin from the pancreatic β-cells, inhibit the activities of insulin and glucagon and cause T2DM. Importance of the conformationally restricted peptides for drug design against T2DM has been invigorated by recent FDA approval of Symlin, which is a large conformationally restricted peptide. However, Symlin still has some issues including solubility, oral bioavailability and cost of preparation. Herein, we introduced a novel strategy for conformationally restricted peptide design adopting a minimalistic approach for cost reduction. We have demonstrated efficient inhibition of amyloid formation of Amylin and its disruption by a novel class of conformationally restricted β-sheet breaker hybrid peptidomimetics (BSBHps). We have inserted β, γ and δ -aminobenzoic acid separately into an amyloidogenic peptide sequence, synthesized α/β, α/γ and α/δ hybrid peptidomimetics, respectively. Interestingly, we observed the aggregation inhibitory efficacy of α/β and α/γ BSBHps, but not of α/δ analogues. They also disrupt existing amyloids into non-toxic forms. Results may be useful for newer drug design against T2DM as well as other amyloidoses and understanding amyloidogenesis
Evaluation of physical properties of Errandi-acrylic union fabrics
Errandi silk has a potential of emerging as “A silk of the new millennium”. The experimental finding provides information on physical properties as well as subjective evaluations of Errandi silk -Acrylic union fabrics with twill and herringbone weave. The count and diameter of errandi silk fibre were higher than acrylic fibre and in case of woven fabrics, herringbone weave were found to have maximum value in cloth covers, weight and thickness. A comparative subjective evaluation was done based on fabric quality by the panel of 100 respondents. 100 per cent respondent opined that all the woven samples have good appearance, soft in hand and smooth in texture. It was observed that cent percent of respondents found errandi-acrylic blended union fabrics with twill and herringbone weaves were high in lustre. The costs of blended yarns and the cost of union fabrics of different proportion were got reduced in comparison to that of 100 per cent errandi-silk yarn (Rs.3000.00/kg) and controlled errandi silk fabrics (Rs.985.00/mt.). Based on the aesthetic properties such as handle, appearance, texture and lustre and considering the cost of twill and herringbone errandi-acrylic fabrics were suitable for production of fashionable wear. Thus¸ the newly designed Errandi silk with Acrylic union fabrics are unique, a new venture for the textile industry and Ericulturists
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