1. Department of Chemistry; University of North Bengal; Darjeeling 734013 West Bengal India
2. Department of Biotechnology; University of North Bengal; Darjeeling 734013 West Bengal India
3. Department of Pure and Applied Chemistry; Tokyo University of Science, 2641 Yamazaki, Noda; Tokyo 278-8510 Japan
4. Department of Chemistry; Tripura University, Suryamaninagar; Agartala 799022 Tripura India
5. Department of Biochemistry; Memorial University of Newfoundland; St. John's Newfoundland and Labrador Canada
6. Department of Chemistry and Chemical Technology; Vidyasagar University; Midnapore 721102 West Bengal India