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The results of flotation tests showed that CEA can selectively separate fluorite and calcite from scheelite at pH 7. The promising selectivity of CEA lies in both the electrical properties and the anions' hydrogen bonding ability with the three calcium minerals. The negatively charged scheelite surfaces are not conducive to coordination bonding with CEA while the positively charged fluorite and calcite surfaces are. Besides, the hydrogen bonding ability of fluorite (F-) and calcite (CO32-) with carbamido in CEA is higher than that of

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To describe the prevalence and severity of diabetic retinopathy (DR) among different ethnic groups of North-East India and to study the associated risk factors. In this hospital based cross sectional study 7,133 individuals among the age group of 20-79 years, attending the OPD, were screened for presence of Diabetes Mellitus (DM) (HbA1c 7% or previously diagnosed). Among them, 780 (10.94%) had diabetes; they were evaluated for presence of any retinopathy (based on fundus photograph and fluorescein angiography), its grade (based on I