==advanced level of English== 
 Hello Deryck, it amused me to find you been responsible for some of the English chemistry articles on here, since I obviously know you already from webelements.com ... it is indeed a small world! ) I don't want to be rude, but are you sure you should consider yourself to have an "advanced" level of English. Over the years reading your postings, I find many of your grammatical/sentence constructions a little, erm, idiosyncratic ) Also, please go easy on us homosexualists, eh? PSML. Love,