The young cluster NGC 2282 : a multi-wavelength perspective

We present the analysis of the stellar content of NGC~2282, a young cluster in the Monoceros constellation, using deep optical $BVI$ and IPHAS photometry along with infrared (IR) data from UKIDSS and $Spitzer$-IRAC. Based on the stellar surface density analysis using nearest neighborhood method, the radius of the cluster is estimated as $\sim$ 3.15\arcmin. From optical spectroscopic analysis of 8 bright sources, we have classified three early B-type members in the cluster, which includes, HD 289120, a previously known B2V type star, a Herbig Ae/Be star (B0.5 Ve) and a B5 V star. From spectrophotometric analyses, the distance to the cluster has been estimated as $\sim$ 1.65 kpc. The $K$-band extinction map is estimated using nearest neighborhood technique, and the mean extinction within the cluster area is found to be A$_V$ $\sim$ 3.9 mag. Using IR colour-colour criteria and H$_\alpha$-emission properties, we have identified a total of 152 candidate young stellar objects (YSOs) in the region, of which, 75 are classified as Class II, 9 are Class I YSOs. Our YSO catalog also includes 50 H$_\alpha$-emission line sources, identified using slitless spectroscopy and IPHAS photometry data. Based on the optical and near-IR colour-magnitude diagram analyses, the cluster age has been estimated to be in the range of 2 $-$ 5 Myr, which is in agreement with the estimated age from disc fraction ($\sim$ 58\%). Masses of these YSOs are found to be $\sim$ 0.1$-$2.0 M$_\odot$. Spatial distribution of the candidate YSOs shows spherical morphology, more or less similar to the surface density map.Comment: 16 pages, 19 Figure

Cerenkov radiation by neutrinos in a supernova core

Neutrinos with a magnetic dipole moment propagating in a medium with a velocity larger than the phase velocity of light emit photons by the Cerenkov process. The Cerenkov radiation is a helicity flip process via which a left-handed neutrino in a supernova core may change into a sterile right-handed one and freestream out of the core. Assuming that the luminosity of the sterile right-handed neutrinos is less than 10^{53} ergs/sec gives an upper bound on the neutrino magnetic dipole moment \mu_\nu < 0.5 \times 10^{-13} \mu_B. This is two orders of magnitude more stringent than the previously established bounds on \mu_\nu from considerations of supernova cooling rate by right-handed neutrinos

Production and stability of al and cu ultrafine particles in nanofluids

In this paper, a two step approach of synthesis of Al and Cu ultrafine particles by mechanical alloying and then dispersing them in base fluid to prepare nanofluid has been reported. Ultrafine powders were prepared by milling elemental Al and Cu powders for 50 h in a planetary mill. After 50 h of milling, particles size has been reduced to 500nm for Al and 400 nm for Cu. It is also found from transmission electron microscopy (TEM) that each particles consists of large number of crystallites of size around 10-15 nm. Aiming at the dispersion of nano-Al and Cu is regarded as the guide of heat transfer enhancement, the stability of Al and Cu particles in water were studied under different pH values. It has been found from Nanozeta meter that Al suspension is stable at pH 2.5 and 9.5, whereas Cu suspension is stable at pH 2.3 and 9.8

Active compounds from tulsi inhibits benzo[a]pyrene mediated cytotoxicity:in vitro & in silico analysis

Environmental Pollution is the one of the major problem of the hour. In this fast moving scenario, pollution both industrial and air plays a major role in affecting living beings. These pollutants mainly consist of mainly organic pollutants and particulate matter. Polycyclic Aromatic Hydrocarbons (PAH) are the groups of organic pollutants that are ubiquitously present, resistant to degradation and can stay for a longer time in the atmosphere.They are known as mutagen, carcinogen and tetratogen. One such PAH is Benzo[a]pyrene, which is first procarcinogen to be discovered which causes skin cancer and respiratory problems etc. Benzo[a]pyrene is a five membered ring which is basically produced from incomplete combustion of fossil fuels, exhaust from automobiles and industries. The toxicity of Benzo[a]pyrene is the result of bioactivation of B[a]P to diolepoxides by monooxygenase enzymes i.e. CYP450 enzyme systems in human body. Diol epoxides are DNA adducts which mutate the p53 tumor suppressor gene leads to tumor. Hence these enzymes are inhibited by active compounds extracted from Black tulsi. They are eugenol, carvacrol, elemene, caryophyllene and linalool. In this study we have reported that active compounds of tulsi bind to cytochrome P450 enzyme active site and inhibit those from binding benzo[a]pyrene. By docking studies done in Hex software has proved that active compounds of tulsi bind to CYP450. Also not only insilico studies but also in-vitro analysis like MTT assay, DAPI staining and EROD assay was done to confirm our topic

Histomorphological analysis of placental changes of pre-eclampsia patients in a tertiary care hospital of Puducherry, India

Background: Placenta is a dynamic tissue synthesized physiologically to serve as a nutrient source for developing fetus it is exposed to several changes in reaction to many toxemic conditions associated with pregnancies. Studies had proved that placental changes observed on histomorphology is directly proportional to reaction to hemodynamic compensatory mechanisms, thereby aiding the obstetricians to manage the sequelae of complications. Objective of this study was to study the placental histomorphology in pregnancies associated with pre-eclampsia and to quantitate the observed placental changes.Methods: The study comprised on 101 placental specimens obtained from department of obstetrics and gynecology, Mahatma Gandhi Medical College and Research Institute, Pondicherry. Toxemia of pregnancies were divided into mild, severe preeclampsia and eclampsia based on blood pressure. The 101 cases were divided as 4 groups: Group 1 (control group); Group 2 (mild preeclampsia); Group 3 (severe preeclampsia); Group 4 (eclampsia).Results: Among the 101 cases, 38 placentas were from uncomplicated full-term deliveries which constitutes the control group. The rest 63 placenta were from toxemia of pregnancies which constitutes the study group.Conclusions: The incidence of toxemic pregnancies and pre-eclamptic cases are on higher margin than assumed. Histomorphology examination of placenta plays a vital role in assessing etiopathogenesis and mechanism of toxemic pregnancies. This aids the obstetrician to further manage subsequent sequelae and fix the complication to significant proportion