Anshu Mishra

Compensation effects in a correlated insulator Fe1-xNixSi

Transport properties of Nickel (Ni) substituted FeSi are investigated. X-ray diffraction measurement shows that the samples are in single phase with Fe successfully being replaced by Ni. Thermo Electric Power (TEP) at low temperatures is dramatic in FeSi that show a systematic reduction by the incorporation of Nickel. Even though the resistivity down to 2K shows a semiconducting behavior, estimation of energy gap has been an ambiguous one. The effects of TEP are dramatic in the sense that it shows the compensation effects in a more clear fashion. A two band model incorporating a metallic and activated conduction resolves the issues like band gap cleaning at low substitution that eventually introduces states at the Fermi level at a higher substitution of Ni.

Anomalous low temperature resistivity in CeCr0.8V0.2Ge3

Resistivity (8T) and heat capacity (0T) of CeCr0.8V0.2Ge3 at low temperatures and high magnetic fields are reported. Resistivity curve shows a Kondo like behavior at an anomalously high temperature of 250K. A broad peak at 20K is observed in resistivity. A sharp change in resistivity around 7.3K is due to magnetic ordering mediated by coherence effects. Similar low temperature peak is also observed in heat capacity around 7.2K. A small magnetic field of the order of 1T shifts the peak towards lower temperatures confirming the antiferromagnetic ordering. A broad feature, which appears in resistivity at 20K, is absent in heat capacity. This feature shift towards higher temperatures with magnetic field, and may be due to the partial ferromagnetic ordering or due to geometrical frustration which opposes the magnetic ordering. The system shows a moderate heavy fermion behavior with Sommerfeld coefficient (γ) of 111mJ/mol-K2. Debye temperature of the compound is 250K. Shifting of TN in magnetic fields towards 0...

A morphology and histological study of placenta in normal and diabetic pregnancies

Background: The placenta is a vital organ for developing foetus, and it is also the most accessible organ of human body, pregnancy in a diabetogenic state by virtue of various physiological changes which cause insulin resistance. In normal pregnancy, glucose tolerance decreases by third trimester, though plasma levels of insulin increase. Aim was to study comparison of placenta of normal pregnancy with placenta of diabetic pregnancy and it the possible outcome of pregnancy. Methods: The present study was case-control and conducted on cases of 50 Specimens of placenta with intact umbilical cord were collected from the Department of Obstetrics and Gynecology. Results: Variation in the shape and weight of the placenta were observed. The mean placenta weight in control group was found to be 452.80 grams with standard deviation 140.93 grams while in the case group; it was 406.00 grams with standard deviation of 210.31 grams. The random blood sugar of mother in control group was significantly higher than cases (t=2.91, p<0.01). Conclusions: The present study shown that there was a tendency of increase in placental weight and weight of new born in complicated pregnancies as compared to the normal pregnancies. This indicated the earlier diagnosis and strict to treatment plan in diabetic pregnancies.

Tortuous forearm arteries and its clinical implications: A Case Report

The arteries of upper limb were studied in 10 cadavers who were dissected in Department of Anatomy, Integral Institute of Medical Sciences and Research, Lucknow of 1 year 2015-2016. The arteries in 9 cadaveric specimens showed the normal arterial configuration. In one cadaver the course of the artery was anomalous. It showed an unusual course with loops and bends. The tortuosity of peripheral arteries is usually asymptomatic. Tortuous or twisted arteries and veins are commonly seen in humans and animals. While mild tortuosity is a common anomaly without clinical symptoms, severe tortuosity can lead to various serious symptoms. Clinical observations have linked tortuous arteries and veins to aging, atherosclerosis, hypertension, genetic defects and diabetes mellitus.