Canonical Leggett-Garg Inequality: Nonclassicality of temporal quantum correlations under energy constraint

Nonclassicality of temporal correlations pertaining to noncommutative sequential measurements is defined through the violation of macrorealistic inequalities, known as Leggett-Garg inequalities (LGI). We investigate the energy cost of the process associated with the Leggett-Garg test in the context of noiseless and Markovian noise for arbitrary initial states. We prove that in noiseless and in certain noisy scenarios, the maximal violations of LGI under the energy constraint occurs when the average energy of the process is equal to the negative of the energy of the initial state. Such a dependence of LGI on the choice of the initial state is not seen in the unconstrained case. Moreover, we find that in the presence of a moderate amount of Markovian noise, the amount of violation of LGI remains almost unaltered with a suitable choice of the evolution and dephasing operators in the neighborhood of the maximal violation line, thereby showing the robustness of temporal correlations under environmental effects.Comment: 8 pages, 6 figures, close to published versio

Deterministic Quantum Dense Coding Networks

We consider the scenario of deterministic classical information transmission between multiple senders and a single receiver, when they a priori share a multipartite quantum state -- an attempt towards building a deterministic dense coding network. Specifically, we prove that in the case of two or three senders and a single receiver, generalized Greenberger-Horne-Zeilinger (gGHZ) states are not beneficial for sending classical information deterministically beyond the classical limit, except when the shared state is the GHZ state itself. On the other hand, three- and four-qubit generalized W (gW) states with specific parameters as well as the four-qubit Dicke states can provide a quantum advantage of sending the information in deterministic dense coding. Interestingly however, numerical simulations in the three-qubit scenario reveal that the percentage of states from the GHZ-class that are deterministic dense codeable is higher than that of states from the W-class.Comment: 11 pages, 2 figures, close to published versio

Starbursts triggered by central overpressure. ii. A parameter study

A parameter study is made of the radiative shock compression of a disk molecular cloud due to the high pressure of the central molecular intercloud medium, after the cloud has fallen into the central region of a galaxy following a galaxy interaction. The dependence of the compression on the disk cloud and central gas parameters has been studied. We show that fshell, the fraction of cloud mass compressed in the outer shell that becomes unstable, is a function of only the external pressure, the cloud radius, and the cloud density. We find that for a wide range of values for the input parameters, fshell is high and lies between 0.75 to 0.90. The fraction fshell is not sensitively dependent on the value of the central gas pressure because the initial inward shock velocity is proportional to the square root of the central pressure, and at later stages it is determined mainly by the self-gravity of the shocked shell. Thus, star formation triggered in disk clouds by compression by the central overpressure, as proposed by Jog & Das, is a general triggering mechanism and is valid as long as the central gas has an overpressure of even a factor of a few higher than that of the incoming disk molecular clouds.We apply the mechanism to the galaxies for which the central gas parameters are known; for example, IC 342 and NGC 1808. We find that in both cases a large fraction of the cloud mass will be compressed. Hence, these galaxies should show a central starburst, provided that there is a substantial gas infall rate from the disk to the central region. This agrees with observations, in that NGC 1808 with gas infall due to galaxy interaction has a central starburst, while IC 342 does not

ISOLATION AND IN VITRO ANTIOXIDANT ACTIVITY OF FLAVONOID FROM LINDERNIA CRUSTACEA (L) F. MUELL

Objective: The objective of the study was to investigate the antioxidant property of different extracts of Lindernia crustacea (L) F. Muell and isolate flavonoid from the potent extract and characterize it. Methods: Isolation was carried out by flash chromatography using Toluene:acetic acid (4:1) as eluent. The isolated compound was characterized using spectroscopic methods. 2, 2′- diphenyl-1-picrylhydrazyl, ferric thiocyanate, thiobarbituric acid, and reducing power assay methods were followed for the antioxidant study. Results: Characterization of the isolated compound confirms it as the flavonoid. Results of the antioxidant study showed that benzene extract has the highest antioxidant activity with a less IC50 value in comparison to ethyl acetate and ethanol extracts. The isolated compound showed significant antioxidant activity when compared with aspirin. Conclusion: The results of the study suggest that L. crustacea (L) F. Muell is a source of flavonoid which has potent antioxidant activity

Phase boundaries in alternating field quantum XY model with Dzyaloshinskii-Moriya interaction: Sustainable entanglement in dynamics

We report all phases and corresponding critical lines of the quantum anisotropic transverse XY model with Dzyaloshinskii-Moriya (DM) interaction along with uniform and alternating transverse magnetic fields (ATXY) by using appropriately chosen order parameters. We prove that when DM interaction is weaker than the anisotropy parameter, it has no effect at all on the zero-temperature states of the XY model with uniform transverse magnetic field which is not the case for the ATXY model. However, when DM interaction is stronger than the anisotropy parameter, we show appearance of a new gapless phase - a chiral phase - in the XY model with uniform as well as alternating field. We further report that first derivatives of nearest neighbor two-site entanglement with respect to magnetic fields can detect all the critical lines present in the system. We also observe that the factorization surface at zero-temperature present in this model without DM interaction becomes a volume on the introduction of the later. We find that DM interaction can generate bipartite entanglement sustainable at large times, leading to a proof of ergodic nature of bipartite entanglement in this system, and can induce a transition from non-monotonicity of entanglement with temperature to a monotonic one.Comment: 19 pages, 14 figure

A Protease Isolated from the Latex of Plumeria rubra Linn (Apocynaceae) 1: Purification and Characterization

Purpose: To isolate, purify and characterize protease from the latex of the plant.Methods: Protease was isolated from the latex of Plumeria rubra Linn using acetone precipitation method and purified by a sequence of DEAE cellulose column chromatography, followed by two successive column purification in Sephadex G-50 and Sephadex G-200. The molecular weight of the purified protease was determined by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDSPAGE). The protease was given a trivial name, Plumerin-R.Results: Plumerin-R showed a single protein band on SDS-PAGE and molecular weight was approximately 81.85 kDa. It remained active over a broad range of temperature but had optimum activity at 55 °C and pH 7.0 when casein was used as substrate. Activation of the protease by a thiol-activating agent indicated the presence of sulfhydryl as an essential group for its activity.Conclusion: A protease from the latex of Plumeria rubra Linn was purified to homogeneity by a simple purification procedure and then characterized.Keywords: Protease, Plumerin-R, Sulfhydryl, Purification; Characterizatio

A new species of Philautus (Anura: Rhacophoridae) from the Eastern Ghats, south-eastern India

A new species of Philautus is described from the vicinity of Vishakhapatnam, Andhra Pradesh in south-eastern India. The new species is compared with congeners from peninsular India and Sri Lanka. Since the members of the genus are restricted to wet evergreen forests of the region, remnant patches of wet forests within a now largely degraded and arid Eastern Ghats are apparently refugia, supporting species that are tolerant of mesic conditions

PHARMACOGNOSTICAL AND PHYTOCHEMICAL STANDARDIZATION OF PHYSALIS MINIMA L. LEAF

Objective: To evaluate the pharmacognostical and phytochemical parameters of Physalis minima leaf. Methods: The leaf of Physalis minima was examined for macroscopical, microscopical, physicochemical parameters and fluorescence analysis. Extracts obtained from the leaf was analyzed for phytochemical screening and estimation of total tannin, phenolic and flavonoid content following the standard procedure available in the literature. Results: Morphologically, the leaf was found to be ovate in shape, 5 to 8 cm long and up to 3 cm width with dentate margin, asymmetrical base, hairy surface, reticulate veins on each side of midrib, green in colour, characteristic odour and slight bitter in taste. Microscopic study has shown the important diagnostic characters of Solanaceae family which is characterized by presence of dorsiventral leaf with anomocytic stomata, grandular or uniseriate trichomes and cluster crystal of calcium oxalate. Physicochemical parameters like foreign organic matter (0.78%), loss on drying (8.23%), total ash (11.4%), acid insoluble ash (2.2%), water-soluble ash (6.1%), sulphated ash (2.4%) alcohol soluble extractive (10.4%), water-soluble extractive (9.5%), ether soluble extractive (1.8%) foaming index (below 100), swelling index (1), volatile oil and heavy metal content were quantified. Phytochemical analysis of different extracts of Physalis minima leaf has shown the presence of phytoconstituents viz. alkaloids, steroids, tannin, flavonoids, protein. Quantification of phytoconstituents was also reported like phenols (10.59±0.65 mg/gm equivalent to tannic acid), tannin (8.24±0.27 mg/gm equivalent to tannic acid) and flavonoids (87.17±0.87 mg/gm equivalent to rutin) respectively. Conclusion: This present study was provided the qualitative and quantitative standard of Physalis minima will help to prevent the possible steps of adulteration with other species of the same genus

Collisional buildup of molecular clouds: mass and velocity spectra

We have studied the evolution of a local region of molecular clouds, moving in the mean gravitational potential of the Galactic disk. The clouds interact gravitationally with one another and undergo inelastic collisions. The clouds have been modeled as spheres, and a collision is assumed to take place when two clouds overlap. The outcome of a collision depends on the relative mass and velocity of the clouds and can result in the fragmentation or coalescence of the clouds. We find that the initial random mass distribution of the clouds evolves into a power-law distribution of the form N(m) ∝ mα , where α = -1.7 to -1.9, and is flatter toward the low-mass end. The mean one-dimensional random velocity of the molecular clouds is ~8-10 km s-1 and is found to be independent of cloud mass. These results agree well with the observed mass and velocity distribution of molecular clouds. We also conclude that cloud collisions in a sheared galactic disk, rather than local gravitional interactions, are important in determining the mass and random velocity distribution of molecular clouds. Cloud collisions thus play a dominant role in the formation of molecular clouds