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  • 1
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    Dietary Phytase: an ideal approach for a cost effective and low-polluting aquafeed (2021)
    In:  http://aquaticcommons.org/id/eprint/9080 | 115 | 2012-11-26 08:27:47 | 9080 | WorldFish Center
    Details
    Publication Date: 2021-07-01
    Description: Global fishmeal production from wild-catch sources cannot continue to increase indefinitely; suitable alternatives have to be found for sustainable aquaculture. Plant-based aquafeed seems to be the ideal alternative to this, but has its own limitations. Plant ingredients are rich in phytic acid, which reduces the bioavailability of nutrients like minerals and protein to the fish, thereby causing aquaculture pollution. Dietary phytase treatment reduces the aquaculture pollution by improving the bioavailability of nutrients, and reduces the feed cost as evident from poultry and piggery. Phytase activity is highly dependent upon the pH of the gut. Unlike mammals, fish are either gastric or agastric, and hence, the action of dietary phytase varies from species to species. In this article, the authors attempt to summarise various effects of phytase on nutrient utilization, growth of fish and aquatic pollution.
    Keywords: Aquaculture ; Diets ; Feeds ; Phytase ; Water pollution ; Growth
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 15-19
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  • 2
    Electronic Resource
    Electronic Resource
    Interactions of berberine with poly(A) and tRNA
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Gene Structure and Expression 1049 (1990), S. 339-342 
    Details
    ISSN: 0167-4781
    Keywords: Alkaloid-nucleic acid interaction ; Berberine ; Poly(A) ; tRNA
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0167-4781(90)90107-D
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  • 3
    Electronic Resource
    Electronic Resource
    Study of particle interactions in microemulsion systems
    Amsterdam : Elsevier
    Chemical Physics Letters 157 (1989), S. 180-182 
    Details
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0009-2614(89)87230-6
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  • 4
    Electronic Resource
    Electronic Resource
    Particle interactions in PMMA latex systems
    Amsterdam : Elsevier
    Chemical Physics Letters 167 (1990), S. 479-483 
    Details
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0009-2614(90)85035-B
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  • 5
    Electronic Resource
    Electronic Resource
    Structure and associated properties of concentrated SiO2 sols in dilute salt solutions (1991)
    Springer
    Colloid & polymer science 269 (1991), S. 1281-1288 
    Details
    ISSN: 1435-1536
    Keywords: SiO2 sols ; structure factor ; radial distribution function ; coordination number ; interparticle distance ; surface potential
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Using the Verwey-Overbeek potential (VO) function the various liquid-state properties of SiO2 sols in dilute salt solutions have been evaluated under the mean spherical model approximation (MSMA). The structure factors of these SiO2 sols predicted by this model are compared with results obtained from small-angle neutron scattering experiments by Ramsay et al. Fourier transformation of these structure factors have been performed to obtain the radial distribution functions (RDF), and from these RDF's we computed coordination numbers of the sol particles. The interparticle distanced c of sol particles has been obtained from the peak position in structure factorS(k) by using the Bragg's equation. The surface potential Ψ s of the oxide sols has been determined from the amplitude (A) of the VO potential. The present calculations clearly indicate some sort of ordering in the sols system. It is gratifying to note that the present theoretical calculations could reproduce the available observed results very satisfactorily with respect to structure factor and other data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652537
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  • 6
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    Estimation of the mass of the black hole candidate MAXI J1659-152 using TCAF and POS models (2016)
    Oxford University Press
    Details
    Publication Date: 2016-06-23
    Description: The Galactic transient black hole candidate (BHC) MAXI J1659–152 exhibited temporal and spectral evolution during its very first X-ray outburst (2010) after its discovery on 2010 September 25. Our recent studies of a few transient BHCs, including MAXI J1659–152, using the Chakrabarti–Titarchuk two-component advective flow (TCAF) solution as an additive table local model in the xspec software revealed details of the accretion-flow dynamics around the black holes. The TCAF model-fitted normalization ( N ) comes out to be almost constant throughout the entire outburst, consisting of several spectral states. We introduce two independent methods to determine the mass ( M BH ) of the BHC: namely (i) keeping the TCAF fitted normalization parameter in a narrow range and (ii) studying the evolution of the quasi-periodic oscillation frequency ( QPO ) with time, fitting with the propagating oscillatory shock (POS) model. The predicted mass ranges of the source with these two methods are 4.7–7.8 M and 5.1–7.4 M , respectively. Combining the results of these two methods, we obtain a most probable mass range of the source of 4.7–7.8 M or $6^{+1.8}_{-1.3}\,\mathrm{M}_{{\odot }}$ .
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 7
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    Resonance condition and low-frequency quasi-periodic oscillations of the outbursting source H1743-322 (2015)
    Oxford University Press
    Details
    Publication Date: 2015-08-06
    Description: It has long been proposed that low-frequency quasi-periodic oscillations (QPOs) in stellar-mass black holes or their equivalents in supermassive black holes are the result of resonances between infall and cooling timescales. We explicitly compute these two timescales in a generic situation to show that resonances are easily achieved. During an outburst of a transient black hole candidate, the accretion rate of the Keplerian disc as well as the geometry of the Comptonizing cloud change very rapidly. During some period, a resonance condition between the cooling timescale (predominantly by Comptonization) and the infall timescale of the Comptonizing cloud is roughly satisfied. This leads to low-frequency quasi-periodic oscillations (LFQPOs) of the Compton cloud and the consequent oscillation of hard X-rays. In this paper, we explicitly follow black hole candidate H1743–322 during its 2010 outburst. We compute the Compton cooling time and infall time over several days and show that QPOs take place when these two roughly agree within ~50 per cent, i.e., the resonance condition is generally satisfied. We also confirm that for the sharper LFQPOs (i.e. higher Q-factors) the ratio of the two timescales is very close to 1.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 8
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    Coherent Error Suppression in Multiqubit Entangling Gates (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-07-12
    Description: Author(s): D. Hayes, S. M. Clark, S. Debnath, D. Hucul, I. V. Inlek, K. W. Lee, Q. Quraishi, and C. Monroe We demonstrate a simple pulse shaping technique designed to improve the fidelity of spin-dependent force operations commonly used to implement entangling gates in trapped ion systems. This extension of the Mølmer-Sørensen gate can theoretically suppress the effects of certain frequency and timing er... [Phys. Rev. Lett. 109, 020503] Published Wed Jul 11, 2012
    Keywords: General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 9
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    Implementation of two-component advective flow solution in XSPEC (2014)
    Oxford University Press
    Details
    Publication Date: 2014-04-02
    Description: Spectral and temporal properties of black hole candidates can be explained reasonably well using Chakrabarti–Titarchuk solution of two-component advective flow (TCAF). This model requires two accretion rates, namely the Keplerian disc accretion rate and the halo accretion rate, the latter being composed of a sub-Keplerian, low-angular-momentum flow which may or may not develop a shock. In this solution, the relevant parameter is the relative importance of the halo (which creates the Compton cloud region) rate with respect to the Keplerian disc rate (soft photon source). Though this model has been used earlier to manually fit data of several black hole candidates quite satisfactorily, for the first time, we made it user friendly by implementing it into xspec software of Goddard Space Flight Center (GSFC)/NASA. This enables any user to extract physical parameters of the accretion flows, such as two accretion rates, the shock location, the shock strength, etc., for any black hole candidate. We provide some examples of fitting a few cases using this model. Most importantly, unlike any other model, we show that TCAF is capable of predicting timing properties from the spectral fits, since in TCAF, a shock is responsible for deciding spectral slopes as well as quasi-periodic oscillation frequencies.
    Print ISSN: 1745-3925
    Electronic ISSN: 1745-3933
    Topics: Physics
    Published by Oxford University Press
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  • 10
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    Characterization of GX 339-4 outburst of 2010-11: analysis by XSPEC using two component advective flow model (2015)
    Oxford University Press
    Details
    Publication Date: 2015-01-07
    Description: We study spectral properties of GX 339-4 during its 2010–11 outburst with two component advective flow (TCAF) model after its inclusion in xspec as a table model. We compare results fitted by TCAF model with combined disc blackbody and power-law model. For a spectral fit, we use 2.5–25 keV spectral data of the Proportional Counter Array instrument onboard RXTE satellite. From our fit, accretion flow parameters such as Keplerian (disc) rate, sub-Keplerian (halo) rate, location and strength of shock are extracted. We quantify how the disc and the halo rates vary during the entire outburst. We study how the halo to disc accretion rate ratio (ARR), quasi-periodic oscillations (QPOs), shock locations and its strength vary when the system passes through hard, hard-intermediate, soft-intermediate and soft states. We find pieces of evidence of monotonically increasing and decreasing nature of QPO frequencies depending on the variation of ARR during rising and declining phases. Interestingly, on days of transition from hard state to hard-intermediate spectral state (during the rising phase) or vice-versa (during decline phase), ARR is observed to be locally maximum. Non-constancy of ARR while obtaining reasonable fits points to the presence of two independent components in the flow.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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