Market Street, Greensboro, NC 27411, USA; E-Mails: muchha@ncat.edu (M.R.); kotaylor@ncat.edu (K.T.); aelobeid@ncat.edu (A.E.) * Author to whom correspondence should be addressed; E-Mail: rravella@ncat.edu; Tel.: +1-336-285-4848; Fax: +1-336-334-7844. Received: 18 ...