Intermittent chaotic chimeras for coupled rotators

Two symmetrically coupled populations of N oscillators with inertia $m$ display chaotic solutions with broken symmetry similar to experimental observations with mechanical pendula. In particular, we report the first evidence of intermittent chaotic chimeras, where one population is synchronized and the other jumps erratically between laminar and turbulent phases. These states have finite life-times diverging as a power-law with N and m. Lyapunov analyses reveal chaotic properties in quantitative agreement with theoretical predictions for globally coupled dissipative systems.Comment: 6 pages, 5 figures SUbmitted to Physical Review E, as Rapid Communicatio

Ultrastructural Study of Muscle Fibers in Experimental Fluorosis

The aim of this study was to evaluate the effect of fluoride on the ultrastructure of skeletal muscle. Wistar albino rats were treated with 300 and 600 mg NaF/ kg bw/day respectively, for 40 days . Group I (Control) was given double distilled water ml/kg bw/day orally for the same period. In control rats, the sarcoplasm was filled with myofibrils and some mitochondria. The sarcomeres showed sarcoplasmic reticulum surrounded by Z- line, A and I-bands. The middle of the sarcomere was marked by M-line situated within lighter H-band. Oval myonucleus with finely dispersed chromatin throughout the nucleoplasm was present. In rats treated with 300 mg NaF/ kg bw/day skeletal muscle showed disorganized myofibrils and disruptions in the continuity of plasma membrane. The undulating sarcolemma and many small electron-lucent vacuoles in the myofibers were noticed. The myofibrils showed  disturbed contractile structure with loss of sarcomere organization and indistinguishable. A-band, I-band , and irregular and distorted Z-line with disruption of myofilaments. Irregularly shaped markedly shrunken myonuclei with clumped and marginated chromatin were prominent. The cristae rich mitochondria were larger than those in control. The hypercontraction of myofilaments and mitochondrial swelling were observed in rats given 600 mg NaF/ kg bw/day. The sarcoplasmic reticulum was irregularly dialated forming large electron-lucent areas. The myofibrilar pattern could no longer be distinguished . There was loss of integrity of the basal lamina and plasma membrane, and inflammatory cells were present around the damaged site

EFFICACY OF BOERHAAVIA DIFFUSA L. ON DISRUPTION OF GONADOTROPINS AND TESTOSTERONE IN FLUORIDE INTOXICATED MALE RATS

  Objective: The present study explored the influence of fluoride exposure on gonadotropins and reproductive hormones.Methods: Male Wistar albino rats weighing 100-150 g were administered with 100, 200, and 300 ppm/kg body weight of sodium fluoride daily for 20 and 40 days. The control group was given 1 ml deionized water/kgbw/day for the same period. At the end of the experimental period, half of the animals were sacrificed and blood serum was collected and testis sample was taken concurrently. Remaining half rats were administrated with two doses (250 mg and 500 mg/kg body weight) of leaf extract of Boerhaavia diffusa L. for another 20 days. Serum level of follicle-stimulating hormone (FSH), luteinizing hormone (LH), testosterone, and intratesticular level of testosterone were evaluated.Results: It was found that fluoride intoxication resulted in significant increase in the level of FSH (p<0.01) and LH (p<0.0001) while significant decrease in the serum (p<0.01) and testis (p<0.0001) level of testosterone. A significant (p<0.0001) positive correlation was found between level of serum fluoride and gonadotropins: FSH (20 days, r=0.708 and 40 days, r=0.795) and LH (20 days, r=0.779 and 40 days, r=0.891). However, there was significant (p<0.0001) negative correlation existed between serum fluoride and testosterone levels in serum (20 days, r=−0.780 and 40 days, r=−0.862) as well as testis (20 days, r=−0.915 and 40 days, r=−0.938).Conclusion: It was found that administration of B. diffusa L. alleviated the adverse effects of fluoride on reproductive endocrine functions

ALLEVIATION OF FLUORIDE INDUCED ALTERATIONS IN ANTIOXIDANT STATUS AND FECUNDITY OF SPERMATOZOA OF RATS BY BOERHAAVIA DIFFUSA L.

Objective: The present study focused on the effect of oral administration of sodium fluoride on antioxidant status and fecundity of spermatozoa of rats and also to evaluate the ameliorative effect of Boerhaavia diffusa L.Methods: Wistar male rats (weighing 100-150g) were administered sodium fluoride (at three different doses 100, 200 and 300 ppm/kg BW) daily for 20 and 40 d. At the end of the experimental period, half of the animals were sacrificed and their epididymis was removed. Remaining half rats were administered B. diffusa (250 and 500 mg/kg BW) for 20 d. Level of malondialdehyde (MDA), the activity of superoxide dismutase (SOD) and catalase (CAT) was estimated. Sperm morphology, count, motility and viability were also determined.Results: There was a dose-dependent significant decrease in activity of SOD (p<0.01) and CAT (p<0.05), and increase (p<0.01) in the level of MDA in experimental rats as compared to the control group. Sperm count, motility and viability were also decreased significantly (p<0.0001) in rats treated with fluoride. The fluorotic rats exhibited morphological abnormalities in the head (amorphous, hookless, double headed and bent), tail (coiled, hairpin looped, double-tailed) and body (short, large and presence of protoplasmic process) of spermatozoa as compared to control group. These toxic effects were reversed by the administration of leaf extract of Boerhaavia diffusa L.Conclusion: The results suggest that Boerhaavia diffusa L. extract attenuates fluoride exerted disruptions to spermatozo

Violation of Bell's inequality for phase singular beams

We have considered optical beams with phase singularity and experimentally verified that these beams, although being classical, have properties of two mode entanglement in quantum states. We have observed the violation of Bell's inequality for continuous variables using the Wigner distribution function (WDF) proposed by Chowdhury et al. [Phys. Rev. A \textbf{88}, 013830 (2013)]. Our experiment establishes a new form of Bell's inequality in terms of the WDF which can be used for classical as well as quantum systems.Comment: 7 pages, 9 figures and 1 tabl

The Connection Between Pulsation, Mass Loss and Circumstellar Shells in Classical Cepheids

Recent observations of Cepheids using infrared interferometry and Spitzer photometry have detected the presence of circumstellar envelopes (CSE) of dust and it has been hypothesized that the CSE's are due to dust forming in a Cepheid wind. Here we use a modified Castor, Abbott & Klein formalism to produce a Cepheid wind, and this is used to estimate the contribution of mass loss to the Cepheid mass discrepancy Furthermore, we test the OGLE-III Classical Cepheids using the IR fluxes from the SAGE survey to determine if Large Magellanic Cloud Cepheids have CSE's. It is found that IR excess is a common phenomenon for LMC Cepheids and that the resulting mass-loss rates can explain at least a fraction of the Cepheid mass discrepancy, depending on the assumed dust-to-gas ratio in the wind.Comment: 5 pages, 3 figures, proceeding for "Stellar Pulsation: Challenges for Theory and Observation", Santa Fe 200

Theoretical Study of Physisorption of Nucleobases on Boron Nitride Nanotubes: A New Class of Hybrid Nano-Bio Materials

We investigate the adsorption of the nucleic acid bases, adenine (A), guanine (G), cytosine (C), thymine (T) and uracil (U) on the outer wall of a high curvature semiconducting single-walled boron nitride nanotube (BNNT) by first principles density functional theory calculations. The calculated binding energy shows the order: G>A\approxC\approxT\approxU implying that the interaction strength of the (high-curvature) BNNT with the nucleobases, G being an exception, is nearly the same. A higher binding energy for the G-BNNT conjugate appears to result from a stronger hybridization of the molecular orbitals of G and BNNT, since the charge transfer involved in the physisorption process is insignificant. A smaller energy gap predicted for the G-BNNT conjugate relative to that of the pristine BNNT may be useful in application of this class of biofunctional materials to the design of the next generation sensing devices.Comment: 17 pages 6 figure