1 Scroll down to the bottom of the page and click the link labeled Get Add-ons to navigate to the Internet Explorer Gallery Add-ons webpage. 2  Select an add-on category from the list of options in the column or use the search engine to locate a particular add-on, extension or plug-in from the available options provided. Click the link labeled Find more toolbars and extensions, located in the lower-left corner of the dialog box, to be redirected to the Internet Explorer Gallery's webpage. 2  Scroll down to the bottom of the page and click the link labeled Get Add-ons to navigate to the Internet Explorer Gallery Add-ons webpage.
PDH may refer to: 1  Angiotensin-converting enzyme, an enzyme. 2  Plesiochronous digital hierarchy, a technology used in telecommunications networks.
A phosphodiesterase (PDE) is any enzyme that breaks a phosphodiester bond. Usually, people speaking of phosphodiesterase are referring to cyclic nucleotide phosphodiesterases, which have great clinical significance and are described below.hosphodiesterase enzymes are often targets for pharmacological inhibition due to their unique tissue distribution, structural properties, and functional properties. Inhibitors of PDE can prolong or enhance the effects of physiological processes mediated by cAMP or cGMP by inhibition of their degradation by PDE.