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To understand the spread of SARS-CoV2, in August and September 2020, the Council of Scientific and Industrial Research (India), conducted a sero-survey across its constituent laboratories and centers across India. Of 10,427 volunteers, 1058 (10.14%) tested positive for SARS CoV2 anti-nucleocapsid (anti-NC) antibodies; 95% of which had surrogate neutralization activity. Three-fourth of these recalled no symptoms. Repeat serology tests at 3 (n=607) and 6 (n=175) months showed stable anti-NC antibodies but declining neutralization activity. Local sero-positivity was higher in densely populated cities and was inversely correlated with a 30 day change in regional test positivity rates (TPR). Regional seropositivity above 10% was associated with declining TPR. Personal factors associated with higher odds of sero-positivity were high-exposure work (Odds Ratio, 95% CI, p value; 2∙23, 1∙92–2∙59, <0.0001), use of public transport (1∙79, 1∙43–2∙24, <0.0001), not smoking (1∙52, 1∙16–1∙99, 0∙0257), non-vegetarian diet (1∙67, 1∙41–1∙99, <0.0001), and B blood group (1∙36,1∙15-1∙61, 0∙001).

on the occasion of his 80th birthday AC permeability measurements of the reentrant spin glass system CdC:r2,In2-,S4 (0.85 < x 1) are performed on toroidal shaped samples by using the transformer technique since the demagnetizing factor is minimized. The complex permeability observed is very close to the true initial permeability. The abrupt decrease of p' a t low temperatures is an intrinsic effect, probably related to the transition to the reentrant spin glass state. The out-of-phase permeability presents a maximum a t the transition temperature TRSG. The frequency dependence of 2'1~s~ is studied (130 Hz 5 5 v 5 100 kHz). Its variation corresponds with the explanation of reentrant properties based on the existence of clusters of which the freezing destroys the ferromagnetic order.En utilisant la mkthode du transformateur, des mesures de permkabilitk alternative ont Cte effectukes sur des bchantillons en forme de tore du systhme rbentrant verre de spin CdCr2,Inz -,S, (0,85 < x 1). Le facteur dkmagnktisant &ant minimisb, la permkabilitb complexe observbe est trhs proche de la permkabilitb initiale intrinshque. A basse tempbrature, la dkcroissance rapide de p' est un effet intrinshque, probablement relib A la transition vers un &tat spin glass rbentrant.La partie complexe de la permkabiliti: prksente un maximum B la tempkrature de transition TRSG.La variation de TRSG avec la frkquence a Otk btudibe (130 Hz 5 v 5 100 kHz); elle est en accord avec l'interprbtation des propribtbs rbentrantes basCe sur l'existence de clusters dont le gel dbtruit l'ordre ferromagnbtique.

The chemistry of the host–guest complex formation has received much attention as a highly efficient approach for use to develop economical adsorbents for water purification. In the present study, the synthesis of three β-cyclodextrin (β-CD) inclusion complexes with the oil orange SS (OOSS) azo dye as a guest molecule and their potential applications in water purification are described. The complexes were synthesized by the coprecipitation method and characterized by Fourier transform infrared (FTIR) spectroscopy, UV–vis spectroscopy, X-ray diffraction (XRD), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). FTIR and thermal analyses confirmed the encapsulation of OOSS dye within the hydrophobic cavity of β-CD. The encapsulation of hydrophobic dye inside the β-CD cavity was mainly due to the hydrophobic–hydrophobic interaction. The results showed that the stability of the OOSS dye had been improved after the complexation. The effect of three different compositions of the host–guest complexes was analyzed. The present study demonstrated that the hydrophobic dye could be removed from aqueous solution via inclusion complex formation. Thus, it can play a significant role in removing the highly toxic OOSS dye from the industrial effluent.

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The cation distribution of the solid solution CdCr2xIn2-2xS4, was determined by Mössbauer spectroscopy on 57Fe doped samples. At high temperature the susceptibility follows a Curie-Weiss law. The low temperature field dependence of the magnetization shows that the samples 0.90≤x≤0.98 are ferromagnetic. In the range 0.25≤x≤0.98, irreversible behaviour, remanent and time dependent magnetization are observed. Magnetization and EPR results on the sample x=0.60 are consistent with the spin glass behaviour found by dc susceptibility measurements.

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