Frequency dependence of dielectric anomaly around Neel temperature in bilayer manganite Pr(Sr0.1Ca0.9)2Mn2O7

A novel frequency dependence of anomaly in dielectric constant versus temperature plot, around the Neel temperature T_N (~150 K), has been observed in a single crystal of bilayer manganite Pr(Sr0.1Ca0.9)2Mn2O7. The anomaly in the permittivity (epsilon'||c) occurs at a temperature T_f which moves within a temperature window (delT_f) of ~40 K around T_N for a frequency range 50 kHz-5 MHz. The capacitive component Cp of the dielectric response exhibits a clear yet broad feature around T_N which establishes the intrinsic capacitive nature of the anomaly.Comment: 15 pages with 4 figures; pdf onl

Evaluation of the Acute Phase Reactants CRP in Unstable Angina Cases

Unstable angina, a syndrome of symptoms caused by ischemia of the heart muscles, is both frightening and disabling and may herald acute myocardial infarction. The immediate precipitating events of the atherosclerotic plaque responsible for that critical degree of ischemia resulting in the syndrome of unstable angina are progression of atherosclerosis platelet aggregation, thrombosis and vasospasm. Acute phase reactants are proteins in the plasma whose levels increase during acute inflammatory states or secondary to certain types of tissue damage. A cross-sectional descriptive study was done in Safdarjung Hospital on 40 subjects and controls to establish the acute phase reactants CRP in unstable angina cases and their relationships. In our study, we found that CRP levels are increased in cases as compared to controls, thus showing a direct correlation

Anomaly in structural noncentrosymmetry around T-N in bulk and nanoscale BiFeO3

Using high resolution powder neutron diffraction data, we show that there is a distinct anomaly in the structural noncentrosymmetry around the magnetic transition point T-N for bulk and nanoscale BiFeO3. It appears that the structural noncentrosymmetry - which gives rise to the ferroelectric polarization - is suppressed anomalously by similar to 1% (of the average noncentrosymmetry at above the magnetic transition) in the bulk sample and by similar to 12% in the nanoscale sample as the magnetic transition is approached from higher temperature. This observation shows that the multiferroic coupling improves in the nanoscale sample which is expected to brighten the application prospects of nanoscale BiFeO3 in nanospintronics-based sensor devices

Anomaly in structural noncentrosymmetry around TN n bulk and nanoscale BiFeO3

Using high resolution powder neutron diffraction data, we show that there is a distinct anomaly in the structural noncentrosymmetry around the magnetic transition point TN for bulk and nanoscale BiFeO3. It appears that the structural noncentrosymmetry - which gives rise to the ferroelectric polarization - is suppressed anomalously by ~1% (of the average noncentrosymmetry at above the magnetic transition) in the bulk sample and by ~12% in the nanoscale sample as the magnetic transition is approached from higher temperature. This observation shows that the multiferroic coupling improves in the nanoscale sample which is expected to brighten the application prospects of nanoscale BiFeO3 in nanospintronics-based sensor devices

High-Resolution Genotyping of the Endemic Salmonella Typhi Population during a Vi (Typhoid) Vaccination Trial in Kolkata

Typhoid fever is caused by the bacterium Salmonella enterica serovar Typhi (S. Typhi) and is a major health problem especially in developing countries. Vaccines against typhoid are commonly used by travelers but less so by residents of endemic areas. We used single nucleotide polymorphism (SNP) typing to investigate the population structure of 372 S. Typhi bacteria isolated from typhoid patients during a typhoid disease burden study and Vi anti-typhoid vaccine trial in Kolkata, India. Approximately sixty thousand people were enrolled for fever surveillance for 19 months prior to, and 24 months following, vaccination of one third of the study population against typhoid (May 2003–December 2006, vaccinations given December 2004). We detected a diverse population of S. Typhi, including 21 different genetic forms (haplotypes) of the bacteria. The most common (69%) were of a haplogroup known as H58, which included all multidrug resistant isolates (bacteria resistant to the antibiotics chloramphenicol, ampicillin and co-trimoxazole). Resistance to quinolones, a class of antibiotics commonly used to treat typhoid fever, was particularly high among a subgroup of H58 (H58-G). Vi vaccination did not obviously impact on the haplotype distribution of the S. Typhi circulating during the study period

TO CONDUCT A MULTI CENTRE SURVEY ON THE AWARENESS OF VENTILATORS AND PULSE OXI METER DISPLAYERS AMONG PHYSIOTHERAPIST AND OTHER INTENSIVE CARE STAFF POSTED IN INTENSIVE CARE UNITS OF VARIOUS HOSPITALS IN NORTH EASTERN STATES OF INDIA.

Background: ICU is a specially staffed and fully equipped unit of the hospital where patient requiring intensive care is kept. In order to meet the demand of seriously ill patients a numbers of sophisticated equipments and gadgets are used. Studies have shown that there is a need for knowledge about the operating system of these machines used in ICU to execute the treatment protocols by the ICU staff. Various therapeutic procedures are done depending on the readings of the machines and monitoring of the values is required before and after the treatment sessions. So it becomes mandatory for the ICU staff to have good command over the parameters of the equipment. The objective of the study is therefore to find out the awareness of two important machines namely the Mechanical ventilator and Pulse oximeter among the ICU staff including the physiotherapist in north eastern states of India. Methods: An observational cross section study has been done with 200 subjects who is working in ICU for more than 6 months. Result: The data of 200 subjects were analyzed and the scores of the questionnaire was estimated using Karl Pearson Correlation Coefficient which has shown that there is a significant (p value =0.00) awareness of pulse oximeter displayers and ventilators among physiotherapist and other ICU staff in the north eastern states of India. Conclusion: Based on the results, it is concluded that 72.5% of the subjects were well aware and 27.5% of the subjects were least aware about the ventilators and pulse oximeter, hence it can be considered that there is an acceptable knowledge among the ICU staff including physiotherapist in north eastern states of India about the ventilator and pulse oximeter displayers

Histopathological Profile of Central Nervous System Tumors in a Peripheral Tertiary Care Centre of West Bengal

Introduction Central nervous system (CNS) tumor incidence is very low in comparison to other organ neoplasm. Recent increase in the incidence may be due to exposure of the population to various risk factors, genetic mutation, or improved diagnosis with advancement in diagnostic modalities. This study aims to observe the histopathological spectrum of CNS tumors with their clinical profile and basic demography at a single center in a peripheral region in West Bengal. Material and Methods A retrospective study was conducted in the department of pathology, Gouridevi Institute of Medical Sciences and Hospital (GIMSH), Durgapur, West Bengal, over a period of 2 years from October 2018 to September 2020 on CNS tumors. Basic demographic data, tumor site, and histopathological profile were obtained from medical records and further analyzed and graded according to the World Health Organization (WHO) classification. Result Among 42 cases of CNS tumors, 29 cases were from different regions of the brain and 13 cases were from the spinal cord, with a male to female ratio (1.21:1); the commonest age group was the sixth decade and most common tumor was meningioma, followed by astrocytic tumors. Conclusion The present study helps provide information regarding the burden of disease in our area. Despite the use of modern imaging techniques that help in the provisional diagnosis of disease, histological examination is the gold standard in diagnosis of varied types

The Effect of Boron and Nitrogen Doping in Electronic, Magnetic, and Optical Properties of Graphyne

The electronic, magnetic, and optical properties of boron- and nitrogen-doped graphyne have been investigated with various doping positions and concentrations of boron and nitrogen atoms. We have explored how the presence of a single dopant atom changes the conductivity of doped graphyne from the semiconducting to metallic one. The boron atom at the chain site introduces spin polarization which is in the ferromagnetic (FM) ground state for minimal boron concentration and in the antiferromagnetic (AFM) ground state for an increasing number of boron atoms in the unit cell. We have examined the origin of spin polarization which increases with increasing dopant concentration. Our optical spectra show that the interband transition takes place in the low energy regime. Due to the presence of dopant atom, the absorption spectra extend from the infrared region to the UV region and exhibit a strong peak. The reflectivity and energy loss spectra derived the plasmon energy for these systems where the reflectivity displays a sharp decline