In some cultures the engagement ring will be worn on the fourth finger of the right hand. The wedding band alone, or together with the engagement ring will be worn on the fourth finger of the left hand after marriage. It is automatically known, when you see a ring on the right hand that the young lady is engaged.If she is not engaged she can wear a ring with any kind of stone on her left hand.ngagement rings are different from wedding rings primarily in that they are worn before a legal or symbolic marriage ceremony. They are often bought before the wedding rings as well, although some people choose matching sets that are purchased together.
In chemistry, stereospecificity is the property of a reaction mechanism that leads to different stereoisomeric reaction products from different stereoisomeric reactants, or which operates on only one (or a subset) of the stereoisomers.he addition of singlet carbenes to alkenes is stereospecific in that the geometry of the alkene is preserved in the product. For example, dibromocarbene and cis -2-butene yield cis -2,3-dimethyl-1,1-dibromocyclopropane, whereas the trans isomer exclusively yields the trans cyclopropane.
1 The cilia of the sensory neurons are immersed in a layer of mucus. 2  Odorant molecules (molecules that we can smell) dissolve in the mucus and. 3  bind to receptors on the cilia.4  These are 7-pass transmembrane proteins. 5  Binding of the odorant activates a G protein coupled to the receptor on its cytoplasmic side.mell depends on sensory receptors that respond to airborne chemicals. In humans, these chemoreceptors are located in the olfactory epithelium â a patch of tissue about the size of a postage stamp located high in the nasal cavity. The olfactory epithelium is made up of three kinds of cells: