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Rare-earth-doped gadolinium fluoride nanocrystals were synthesized by a single step synthesis employing ethylene glycol as solvent. Based on X-ray diffraction studies, stabilization of hexagonal modification of GdF 3 has been inferred. The microscopic studies show formation of uniformly distributed nanocrystals (∼15 nm). The nanoparticles are readily dispersible in water and show bright luminescence in colloidal solution. The luminescence properties have been investigated as a function of activator concentrations, and enhanced optical properties have been attributed to efficient energy transfer from the Gd 3+ to the activator RE 3+ ions, which has further been confirmed by steady-state and time-resolved optical studies. It has been demonstrated that on doping appropriate amount of activators in host GdF 3 , a novel white-light-emitting phosphor is obtained with CIE co-ordinates and correlated color temperature (CCT) very close to broad daylight. This can have promising applications as phosphor for white-light ultraviolet-light-emitting diodes (UV-LEDs). Our experiments showed efficient labeling of human breast carcinoma cells (MCF-7) by Tb 3+ -doped GdF 3 nanoparticles. The fluorescence intensity was found to be dependent on the surface modifying/coating agent, and the results were validated using confocal microscopy in terms of localization of these functionalized nanoparticles.

Tribes. of Bihar present a picturesque perspective TX ‘life and activities. They are to be found at diversified levels of cultural development- The paper aims to look into the impact of industriali...

ABO blood group incompatibility and effect of parental consanguinity on fertility and mortality in 172 Muslims of Punia division. Bihar suggest a negative effect of consanguinity on fertility and m...

Based on four genetic systems (ABO and Rh blood group, PTC taste sensitivity and colour blindness), gene diversity and genetic distances have been estimated among six endogamous population group of...

The present study reports the distribution of the ABO blood groups among the Oraons of Pumia District, Bihar. There is a predominance of blood group A in this tribe, and the allelic frequencies are...

Consanguineous marriages are common in Muslims. Consanguinity leads to homozygous. A survey was made to assess the effects of consanguinity on the ABO blood groups and I.Q. in Muslims of Purnia, Bi...

Hypertrichosis among Oraons of Purnea was studied. Hypertrichosis of ears among Oraons have a frequency of 15.55% (hairy helix 5.18%. tragus hair 7.40% and ear lobe 2.96%) which is similar to India...

Consider a normal population with mean μ and variance σ2. We are interested in the estimation of population variance with the help of guess value σ 0 2 and a sample of observations. In this paper, a double stage shrinkage estimator\(\hat \sigma _k^2 \) based on the shrinkage estimatorks 1 2 +(1-k)σ 0 2 ifs 1 2 ∈R and the usual estimator\(s^2 = \frac{{(n_1 - 1)s_1^2 + (n_2 - 1)s_2^2 }}{{n_1 + n_2 - 2}}\) ifs 1 2 ∋R, whereR is some specified region, have been proposed. The expressions for bias and mean squared error have been obtained. Comparison with the usual estimators 2 have been made. It was found that though the largest gain is obtained fork=0, we can use\(\hat \sigma _k^2 \) with 0≦k≦1/2 even when σ2 is very close to σ 0 2