The subject of Biotechnology has tremendous scope in all fields of human endeavour including fields like Medical, Agriculture, and Industry and so on. Present book covers important biotechnology topics such as transgenic plants in revolution of Agriculture , AIDS and its therapy, Biodiesel a prospective fuel of the future, Biosensors and their applications, synthetic viral vaccines, present status of edible vaccines, photodynamic therapy for cancer, impact of pheromones in integrated paste control, PCR-a new emerging tool in Biotechnology. Remaining important topics may be covered in next volume of the book. Applications of Biotechnology in improving quality of food, nutrition, medicine will be felt continuously to meet the ever increasing needs of human race on this earth. Book is expected to be very useful to students, teachers and Research scholars in all the fields of Life Sciences including Biotechnology.