Thanks to all the members of the School of Biotechnology and Biomolecular Sciences, past and present who have provided help, assistance, encouragement and a friendly work environment. Most importantly I thank my wife Shila for her sacrifice, my daughter Pritha and my son Pritan who were deprived of my care and companion during these years. I thank my friends and family members, especially my mum, brothers, sister, sister-in-laws, niece and nephews who I miss in Australia but are always a source of happiness and inspiration in my life.