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OALib Journal期刊

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Phenanthrenes of Eulophia ochreata Lindl.
Kshirsagar Rajendra,Kanekar Yogesh,Jagtap Suresh,Upadhyay Shakti
International Journal of Green Pharmacy , 2010,
Abstract: Pawra tribe of Satpuda mountain ranges that belong to Maharashtra region, India, is known to use tubers of Eulophia ochreata for rejuvenating and aphrodisiac properties and also for curing rheumatism. For systematic scientific validation of folk claims of E. ochreata tubers, we report here the collection, extraction, isolation and spectral characterization of molecules and also its evaluation for free radical scavenging activity. Isolation of molecules was carried out on activity-guided fractionation in 2,2 ′ -diphenyl-1-picrylhydrazyl assay. This is the first report of isolation of 9,10-Dihydro-2,5-Dimethoxyphenanthrene-1,7-diol and 5,7-Dimethoxyphenanthrene-2,6-diol from this orchid.
Diagram and Metaphor in Design: the Divine Comedy as a Spatial Model.
Aarati Kanekar
Philosophica , 2002,
Abstract: Translations across symbolic forms necessarily involve shifts and transformations of meaning due to the logic of the medium. They challenge us to examine fundamental metaphors as an aspect of design reasoning, particularly in relation to the construction of spatial relationships and meanings. They also involve the exploration of diagrams as a way of moving from the space of linguistic description to architectural space where topology and visual image are tightly interfaced. In this paper, Terragni's unrealized design for a monument to Dante, which projects The Divine Comedy into an architectural schema is examined as a case study. The Divine Comedy is treated as an expanded body of work that includes, in addition to the original text, a multitude of paintings, as well as Terragni's project. The paper draws a distinction between transformations of meaning that arise of necessity due to the internal logic of symbolic forms and transformations which manifest specific design intentions. The Divine Comedy with its compositional, numerological, and descriptive attributes forms the program for the architectural project. Nevertheless, as in any project, the program does not, in itself, generate architecture. This paper shows that in the Danteum project three major operations are involved in design synthesis. The first inflects the familiar metaphor of the column as a body. The second uses recursive 'extreme to mean ratio' proportions to establish nesting, repetition and scaling, and through these a sense of unity. The third uses a pattern of overlapping squares so as to create a dialogue between strongly differentiated interiors and transitional zones. These operations in conjunction with the compositional and narrative aspects of the poem interpreted as program make the translation from linguistic space to architectural space possible. Thus, in this case, design formulation is not based on a single metaphor, but rather on a system of metaphors working together to bring physical elements, spatial relationships and design operations within a coherent framework of design reasoning.
Atlantoaxial dislocation in idiopathic cervical dystonia
Kanekar S
Neurology India , 2004,
Abstract: We report a case of severe cervical spondylosis and atlantoaxial dislocation (AAD) in association with idiopathic cervical dystonia (ICD) in a middle-aged male. To our knowledge, this is the first case of ICD reported in association with AAD.
A critique of scaling behaviour in non-linear structure formation scenarios
Nissim Kanekar
Physics , 1998, DOI: 10.1086/308437
Abstract: Moments of the BBGKY equations for spatial correlation functions of cosmological density perturbations are used to obtain a differential equation for the evolution of the dimensionless function, $h = - ({v/{\dot{a}x}})$, where $v$ is the mean relative pair velocity. The BBGKY equations are closed using a hierarchical scaling ansatz for the 3-point correlation function. Scale-invariant solutions derived earlier by Davis and Peebles are then used in the non-linear regime, along with the generalised stable clustering hypothesis ($h \to $ const.), to obtain an expression for the asymptotic value of $h$, in terms of the power law index of clustering, $\gamma$,and the tangential and radial velocity dispersions. The Davis-Peebles solution is found to require that tangential dispersions are larger than radial ones, in the non-linear regime; this can be understood on physical grounds. Finally, stability analysis of the solution demonstrates that the allowed asymptotic values of $h$, consistent with the stable clustering hypothesis, lie in the range $0 \leq h \leq 1/2$. Thus, if the Davis-Peebles scale-invariant solution (and the hierarchical model for the 3-pt function) is correct, the standard stable clustering picture ($h \to 1$ as $\bar\xi \to \infty$) is not allowed in the non-linear regime of structure formation.
Giant Metrewave Radio Telescope detection of two new HI 21cm absorbers at $z \approx 2$
Nissim Kanekar
Physics , 2014, DOI: 10.1088/2041-8205/797/2/L20
Abstract: I report the detection of HI 21cm absorption in two high column density damped Lyman-$\alpha$ absorbers (DLAs) at $z \approx 2$ using new wide-band $250-500$ MHz receivers onboard the Giant Metrewave Radio Telescope. The integrated HI 21cm optical depths are $0.85 \pm 0.16$ km/s (TXS1755+578) and $2.95 \pm 0.15$ km/s (TXS1850+402). For the $z=1.9698$ DLA towards TXS1755+578, the difference in HI 21cm and CI profiles and the weakness of the radio core suggest that the HI 21cm absorption arises towards radio components in the jet, and that the optical and radio sightlines are not the same. This precludes an estimate of the DLA spin temperature. For the $z = 1.9888$ DLA towards TXS1850+402, the absorber covering factor is likely to be close to unity, as the background source is extremely compact, with all the 5 GHz emission arising from a region of size $\leq 1.4$ mas. This yields a DLA spin temperature of ${\rm T_s} = (372 \pm 18) \times (f/1.0)$ K, lower than typical ${\rm T_s}$ values in high-$z$ DLAs. This low spin temperature and the relatively high metallicity of the $z = 1.9888$ DLA ([Zn/H] $= (-0.68 \pm 0.04)$) are consistent with the anti-correlation between metallicity and spin temperature that has been earlier found in damped Lyman-$\alpha$ systems.
Constraining changes in the proton-electron mass ratio with inversion and rotational lines
Nissim Kanekar
Physics , 2011, DOI: 10.1088/2041-8205/728/1/L12
Abstract: We report deep Green Bank Telescope (GBT) spectroscopy in the redshifted NH$_3$~(1,1), CS~1-0 and H$_2$CO~0$_{\rm 00}$-1$_{\rm 01}$ lines from the $z \sim 0.685$ absorber towards B0218+357. The inversion (NH$_3$) and rotational (CS, H$_2$CO) line frequencies have different dependences on the proton-electron mass ratio $\mu$, implying that a comparison between the line redshifts is sensitive to changes in $\mu$. A joint 3-component fit to the NH$_3$, CS, and H$_2$CO lines yields $[\Delta \mu/\mu] = (-3.5 \pm 1.2) \times 10^{-7}$, from $z \sim 0.685$ to today, where the error includes systematic effects from comparing lines from different species and possible frequency-dependent source morphology. Two additional sources of systematic error remain, due to time variability in the source morphology and velocity offsets between nitrogen-bearing and carbon-bearing species. We find no statistically-significant ($\ge 3 \sigma$) evidence for changes in $\mu$, and obtain the stringent $3\sigma$ constraint, $[\Delta \mu/\mu] < 3.6 \times 10^{-7}$, over 6.2~Gyrs; this is the best present limit on temporal changes in $\mu$ from any technique, and for any lookback time, by a factor $\gtrsim 5$.
Public Health Ethics Related Training for Public Health Workforce: An Emerging Need in the United States
A Kanekar,A Bitto
Iranian Journal of Public Health , 2012,
Abstract: Background: Ethics is a discipline, which primarily deals with what is moral and immoral behavior. Public Health Ethics is translation of ethical theories and concepts into practice to address complex multidimensional public health problems. The primary purpose of this paper was to conduct a narrative literature review-addressing role of ethics in developing curriculum in programs and schools of public health, ethics-related instruction in schools and programs of public health and the role of ethics in developing a competent public health workforce. Methods: An open search of various health databases including Google scholar and Ebscohost yielded 15 articles related to use of ethics in public health practice or public health training and the salient features were reported. Results: Results indicated a variable amount of ethics' related training in schools and programs of public health along with public health practitioner training across the nation. Bioethics, medical ethics and public health ethics were found to be subspecialties' needing separate ethical frameworks to guide decision making.Conclusions: Ethics based curricular and non-curricular training for emerging public health professionals from schools and programs of public health in the United States is extremely essential. In the current age of public health challenges faced in the United States and globally, to have an ethically untrained public health force is arguably, immoral and unethical and jeopardizes population health. There is an urgent need to develop innovative ethic based curriculums in academia as well as finding effective means to translate these curricular competencies into public health practice.
A deep search for CO J=2-1 emission from a Lyman-Alpha blob at z~6.595
Jeff Wagg,Nissim Kanekar
Physics , 2012, DOI: 10.1088/2041-8205/751/2/L24
Abstract: We have used the Green Bank Telescope to carry out a deep search for redshifted CO J=2-1 line emission from an extended (>17 kpc) Ly-Alpha blob (LAB), "Himiko", at z~6.595. Our non-detection of CO J=2-1 emission places the strong 3-sigma upper limit of L'_CO < 1.8x10^10 x sqrt(dV/250) K km/s pc^2 on the CO line luminosity. This is comparable to the best current limits on the CO line luminosity in LABs at z~3 and lower-luminosity Lyman-Alpha emitters (LAEs) at z>~6.5. High-z LABs appear to have lower CO line luminosities than the host galaxies of luminous quasars and sub-mm galaxies at similar redshifts, despite their high stellar mass. Although the CO-to-H2 conversion factor is uncertain for galaxies in the early Universe, we assume X_CO = 0.8 Msun (K km/s pc^2)^-1 to obtain the limit M(H_2) < 1.4 x 10^10 Msun on Himiko's molecular gas mass; this is a factor of >2.5 lower than the stellar mass in the z~6.595 LAB.
Gravitational clustering in a D-dimensional Universe
T. Padmanabhan,Nissim Kanekar
Physics , 1999, DOI: 10.1103/PhysRevD.61.023515
Abstract: We consider the problem of gravitational clustering in a D-dimensional expanding Universe and derive scaling relations connecting the exact mean two-point correlation function with the linear mean correlation function, in the quasi-linear and non-linear regimes, using the standard paradigms of scale-invariant radial collapse and stable clustering. We show that the existence of scaling laws is a generic feature of gravitational clustering in an expanding background, in all dimensions except D=2 and comment on the special nature of the 2-dimensional case. The D-dimensional scaling laws derived here reduce, in the 3-dimensional case, to scaling relations obtained earlier from N-body simulations. Finally, we consider the case of clustering of 2-dimensional particles in a 2-D expanding background, governed by a force -GM/R, and show that the correlation function does not grow (to first order) until much after the recollapse of any shell.
The effects of anti-correlation on gravitational clustering
Nissim Kanekar,T. Padmanabhan
Physics , 2001, DOI: 10.1046/j.1365-8711.2001.04381.x
Abstract: We use non-linear scaling relations (NSRs) to investigate the effects arising from the existence of negative correlations on the evolution of gravitational clustering in an expanding universe. It turns out that such anti-correlated regions have important dynamical effects on {\it all} scales. In particular, the mere existence of negative values for the linear two-point correlation function $\xib_L$ over some range of scales starting from $l = L_o$, implies that the non-linear correlation function is bounded from above at {\it all} scales $x < L_o$. This also results in the relation $\xib \propto x^{-3}$, at these scales, at late times, independent of the original form of the correlation function. Current observations do not rule out the existence of negative $\xib$ for $ 200 h^{-1}$ Mpc $\la \xib \la 1000 h^{-1}$ Mpc; the present work may thus have relevance for the real Universe. The only assumption made in the analysis is the {\it existence} of the NSR; the results are independent of the form of the NSR as well as of the stable clustering hypothesis.
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