Sentences with phrase «absence of certain classes»

Past research has looked at links between disease and the presence or absence of certain classes of bacteria in the gut.

Not exact matches

Reasons for the absence of a liquid secondary market on an exchange include the following: (1) there may be insufficient trading interest in certain options; (2) an exchange may impose restrictions on opening transactions or closing transactions or both; (3) trading halts, suspensions or other restrictions may be imposed with respect to particular classes or series of options; (4) unusual or unforeseen circumstances may interrupt normal operations on an exchange; (5) the facilities of an exchange or the Options Clearing Corporation (OCC) may not at all times be adequate to handle current trading volume; or (6) one or more exchanges could, for economic or other reasons, decide or be compelled at some future date to discontinue the trading of options (or a