Datolite Definition Datolite is a colourless mineral consisting of a hydrated silicate of calcium and boron in monoclinic crystalline form, occurring in cavities in igneous rocks. Its formula: CaBSiO 4(OH). It was first observed by Jens Esmark in 1806, and named by him from δατεῖσθαι, &.....
Granzyme Definition Granzyme is a group of serine proteases that are released by the body’s natural killer cells and cytotoxic T-cells. When cells become infected by viruses, the immune system is triggered. Cytotoxic T cells and natural killer cells release a protein called perforin, which atta.....
Adding Positive and Negative Integers If one of the integers is negative, subtract the absolute value of it from the other number. Example: 14 + (-6) = 14 – 6 = 8 If both of the integers are negative, add their absolute values and prefix the number with a negative sign. Rule 1: Adding posit.....
Zeta Potential Definition Zeta potential, also known as electrokinetic potential, is measured in millivolts (mV). It is the potential difference across phase boundaries between solids and liquids. It is usually denoted using the Greek letter zeta (ζ), hence ζ-potential. The zeta potential is th.....
Pyridazine Definition Pyridazine is a heteroaromatic organic compound with the molecular formula C4H4N2, sometimes called 1,2-diazine. It contains a six-membered ring with two adjacent nitrogen atoms, and is aromatic. It is a colorless liquid with a boiling point of 208 °C. The pyridazine ring s.....
History of Nestle Nestlé is an international company with its headquarters in Vevey, Switzerland. In 1867 Henri Nestlé, a chemist from Frankfurt who had settled in Vevey, became interested in infant feeding. To satisfy a clear need, he developed and produced a milk-based food for babies whose m.....
Datolite Definition Datolite is a colourless mineral consisting of a hydrated silicate of calcium and boron in monoclinic crystalline form, occurring in cavities in igneous rocks. Its formula: CaBSiO 4(OH). It was first observed by Jens Esmark in 1806, and named by him from δατεῖσθαι, &.....
About Passions Definition In philosophy, Passions is a central concept, which refers to the conception of subjectivity. For philosophers of freedom, passion is a “disease of the soul” (Kant), for the rationalist philosophers (Plato, Descartes), they blur the trial and prevent access to truths.....
