ON SEPARATION AXIOMS IN TOPOLGICAL SPACES

The purpose of this paper is to introduce weak separation axioms via sgp-closed sets in topological spaces and study some of their properties

Analgesic Activity of Sebastiania chamaelea (L.) Muell. Arg.

Background: This study intended to experimentally evaluate the analgesic activity of Sebastiania chamaelea (L.) Muell. Arg. which is widely used by folklore and traditional healers in pain relief. The drug is commonly known as ‘Bhumi Eranda’ among the locals.Methods: The plant material of Sebastiania chamaelea (L.) Muell. Arg. was collected from the fields of Sri Sri College of Ayurvedic Science and Research, Bangalore and preserved as per the standard method. The toxicity studies carried out earlier has proved that, the drug was non-toxic up to 3000 mg/kg body weight. The effective doses were derived as 300 mg/kg (lower) and 600 mg/kg (higher) body weight and the experimental study was conducted. Analgesic screening models used for the study are – Eddy’s Hot plate and Tail immersion models. The study was carried out in 4 groups i.e. Control, Standard, Lower dose Kashaya of Sebastiania chamaelea (L.) Muell. Arg. and Higher dose Kashaya of Sebastiania chamaelea (L.) Muell. Arg. in each model. The activity was compared with a standard reference drug, Tramadol and Diclofenac.Results: The results were analyzed by using one-way analysis of variance (ANOVA) test followed by Dunnett test to detect the significance of differences between each group and control.Conclusion: The study helped to conclude, Sebastiania chamaelea (L.) Muell. Arg. as an ideal analgesic and supported the traditional claim

Transport and infrared photoresponse properties of InN nanorods/Si heterojunction

The present work explores the electrical transport and infrared (IR) photoresponse properties of InN nanorods (NRs)/n-Si heterojunction grown by plasma-assisted molecular beam epitaxy. Single-crystalline wurtzite structure of InN NRs is verified by the X-ray diffraction and transmission electron microscopy. Raman measurements show that these wurtzite InN NRs have sharp peaks E2(high) at 490.2 cm-1 and A1(LO) at 591 cm-1. The current transport mechanism of the NRs is limited by three types of mechanisms depending on applied bias voltages. The electrical transport properties of the device were studied in the range of 80 to 450 K. The faster rise and decay time indicate that the InN NRs/n-Si heterojunction is highly sensitive to IR light

Droplet epitaxy of InN quantum dots on Si(111) by RF plasma-assisted molecular beam epitaxy

InN quantum dots (QDs) were fabricated on Si(111) substrate by droplet epitaxy using an RF plasma-assisted MBE system. Variation of the growth parameters, such as growth temperature and deposition time, allowed us to control the characteristic size and density of the QDs. As the growth temperature was increased from 100 °C to 300 °C, an enlargement of QD size and a drop in dot density were observed, which was led by the limitation of surface diffusion of adatoms with the limited thermal energy. Atomic force microscopy (AFM) and scanning electron microscopy (SEM) were used to assess the QDs size and density. The chemical bonding configurations of InN QDs were examined by X-ray photo-electron spectroscopy (XPS). Fourier transform infrared (FTIR) spectrum of the deposited InN QDs shows the presence of In-N bond. Temperature-dependent photoluminescence (PL) measurements showed that the emission peak energies of the InN QDs are sensitive to temperature and show a strong peak emission at 0.79 eV

An electron spin resonance study of Mn<SUP>2+</SUP>doped calcium hydrazine carboxylate monohydrate

Single crystals of calcium hydrazine carboxylate, monohydrate have been studied by ESR of Mn2+ doped in the calcium sites. X-band ESR indicated a large crystal field splitting necessitating experiments at Q band. The analysis shows two magnetically inequivalent (but chemically equivalent) sites with g xx = 2.0042&#177;0.0038,g yy=2.0076 &#177;0.0029,g zz=2.0314&#177;0.001,A zz=0.0099&#177;0.0002 cm-1,A xx=0.0092&#177;0.0002 cm-1,A yy=0.0082&#177;0.0002 cm-1,D=3/2Dzz=0.0558&#177;0.0006 cm-1, and E=1/2 (Dyy-Dyy)=0.0127&#177;0.0002 cm-1. One of the principal components of the crystal field, (Dzz), is found to be along the Ca &#8596;Ca direction in the structure and a second one, (Dxx), along the perpendicular to the plane of the triangle formed by three neighbouring calciums. The A tensor is found to have an orientation different from that of the g and D tensors reflecting the low symmetry of the Ca2+ sites

The Density of States of hole-doped Manganites: A Scanning Tunneling Microscopy/Spectroscopy study

Variable temperature scanning tunneling microscopy/spectroscopy studies on single crystals and epitaxial thin films of hole-doped manganites, which show colossal magnetoresistance, have been done. We have investigated the variation of the density of states, at and near the Fermi energy ($E_f$), as a function of temperature. Simple calculations have been carried out, to find out the effect of temperature on the tunneling spectra and extract the variation of density of states with temperature, from the observed data. We also report here, atomic resolution images, on the single crystals and larger range images showing the growth patterns on thin films. Our investigation shows unambiguously that there is a rapid variation in density of states for temperatures near the Curie temperature ($T_c$). While for temperatures below $T_c$, a finite DOS is observed at $E_f$, for temperatures near $T_c$ a hard gap opens up in the density of states near $E_f$. For temperatures much higher than $T_c$, this gap most likely gives way to a soft gap. The observed hard gap for temperatures near $T_c$, is somewhat higher than the transport gap for all the materials. For different materials, we find that the magnitude of the hard gap decreases as the $T_c$ of the material increases and eventually, for materials with a $T_c$ close to 400 K, the value of the gap approaches zero.Comment: 9 pages RevTeX, 12 postscript figures, 1 table included in text, submitted to Physical Review

Perturbed nasal resonance – An insight into alterations in post adenoidectomy patients

Introduction Adenoidectomy with or without tonsillectomy is a common procedure performed by otolaryngologist in children. Most children between the ages 4 to 12 years have a relative hypertrophy of the lymphoid tissue in pharynx, including both tonsil and adenoid. This enlargement can cause obstructive symptoms of varying degree and several aspects of the speech spectrum such as resonance and articulation are reported to be negatively affected. Change in voice after surgery is often a cause of concern among patients and parents, more so among those who use their voices in a professional capacity. The purposes of the study were to assess the pre and post operatively changes in nasal resonance following adenoidectomy in children. Materials & Methods: The children between 4 to 12 years suffering from chronic adenoiditis, who underwent adenoidectomy at Father Muller Medical College Hospital, Mangalore from November 2015 to June 2016 were included in the study. The children were subjected to detailed ear, nose and throat examination, X- ray of nasopharynx, diagnostic nasal endoscopy and nasometry before adenoidectomy surgery and compared with 3 weeks after surgery. Results: A total of 60 patients were enrolled, out of these 21 were male and 39 were female. The maximum patients were seen in the 7 to 9 age group and majority of the patients were noted to have Grade III tonsils (46.60%) at the time of surgery. The mean preoperative nasalance score was 47.30 percent which decreased to 16.85 percent postoperatively, showed significance (p=0.000). Conclusion: Adenoidectomy can alter the acoustic characteristics of the vocal tract and causes alterations in the nasality.Therefore, surgeon can reassure patients, especially voice professionals

Voice analysis following turbinectomy in patients with hypertrophied inferior turbinate secondary to allergic and vasomotor rhinitis refractory to conservative treatment

Introduction: Alterations in the configuration of the nasal cavity made surgicallyvia procedures such as turbinectomy have been assumed to cause changes in the perceived nasal resonance of the patients post surgery which tends to manifest changes in the overall voice perception. These changes though perceivable are reported to be transient in nature and eventually fall in place as the post surgical duration increases. The purpose of this study was to probe the changes in nasal resonance that affect perceived voice quality following turbinectomy in patients with hypertrophied inferior turbinates secondary to allergic and vasomotor rhinitis, by checking serially obtained nasalance scores. Aim of the study: The aim of the study is to assess the pre and postoperative nasal resonance and thereby voice quality in patients with hypertrophied inferior turbinates following turbinectomy. Materials & Methods: The patients who underwent Turbinectomy, at FMMCH, Mangalore from March 2015 to October 2016 were included in the study. The diagnosis was made based on patient history, clinical examination and nasal endoscopy. The Nasalance was assessed using the Nasometer module of VAGHMI, voice and speech system, Bangalore.The nasalance scores were recorded before surgery and at intervals of 1st , 3rd and 5th month post surgery. Results: A total of 90 patients were enrolled, out of these 60 patients successfully completed follow up visits on a regular basis. The mean nasalance scores for nasal sounds [m] [ma] and [mi] showed significance before surgery and at the 1st and 3rd month post-surgery. Consequently, nasalance values returned within normal range at the 3rd month post operatively. While the mean nasalance scores for non nasal sounds [a] [i] and [u] returned to normal range at the 5th month post operatively. Conclusion: The presence of a hypertrophied inferior turbinate and the excision of the same can alter the overall perceived nasal resonance of an individual. Though transient, these changes cause significant change in the nasalence scores. A significant amount of hyponasality is perceived and recorded in the pre operative nasalence scores while hypernasality is perceived and recorded for a period of 3 months post surgery which eventually diminishes and normalizes by the 5th month post surgery. Therefore, surgeons can conveniently reassure patients of the transient nature of the pre and post voice and nasal alterations associated in these conditions. This information will be highly beneficial to patients who are professional voice user

Effect of heat shock protein 70 polymorphism on thermotolerance in Tharparkar cattle

Abstract Aim: Out of various members of heat shock protein (HSP) superfamily which act a molecular chaperon by binding to the denaturing protein thus stabilizing them and preserving their activity, HSP70 are of major importance in thermotolerance development. Thus, present investigation aimed at a screening of HSP70 gene for polymorphisms and possible differences in thermotolerance in Tharparkar breed of cattle. Materials and Methods: A 295 bp fragment of HSP70 gene was subjected to polymerase chain reaction-singlestrand conformation polymorphism (SSCP) followed by sequencing of different SSCP patterns in 64 Tharparkar cattle. A comparative thermotolerance of identified genotypes was analyzed using heat tolerance coefficients (HTCs) of animals for different seasons. Results: Three SSCP patterns and consequently two alleles namely A and B were documented in one fragment of HSP70 gene. On sequencing, one single-nucleotide polymorphism with G &gt; T substitution was found at a position that led to a change of amino acid aspartate to tyrosine in allele A. It was found that in maintaining near normal average rectal temperature, genotype AA was superior (p≤0.01). Genotype AA, thus, was found to be most thermotolerant genotype with the highest HTC (p≤0.01). Conclusion: The polymorphism at HSP70 is expected to be a potent determinant for heat tolerance in cattle, which may aid in selection for thermotolerance in cattle