Informatics Publishing Limited

U. Ghosh ¹, A. Bhattacharjee ¹, P. K. Bose ¹, D. R. Choudhuri ¹, H. Gangopadhyay ¹

Affiliations
1 Department of Food Technology & Biochemical Engineering, Jadavpur University, Calcutta - 700 032, IN

Abstract

All fresh horticultural crops are living materials, possessing biological processes which are essential for the maintenance of life, which left uncontrolled, will lead to the deterioration of the produce. The shelf life of produce is limited by physiological ageing and water loss. Modified Atmosphere Packaging (MAP) addresses both these factors and enables significant product specific shelf life extension. Modified atmosphere (MA) conditions are created inside the packages either by the commodity itself and/or by active modification.

Full Text

     

R. K. Bhakat ¹, A. Bhattacharjee ², U. K. Kanp ¹

Affiliations
1 Department of Botany and Forestry, Vidyasagar University, Midnapore 721102, West Bengal, IN
2 Department of Botany, Burdvvan University, Golapbng 713 104, Burdwan, West Bengal, IN

Abstract

The present study shows that seed pretreatment of Mimosa with various concentrations of Lniitnnn leaf extracts and leaf leachates for 24 hours duration reduced percentage germination, speed of seed, germination and field emergence capacity. Levels of insoluble carbohydrate and protein and activities of catalase and dehydrogenase enzymes were significantly reduced in seed samples pretreated with leaf extracts and leaf leachates of Lantana. Seedling performance was found to be much poor when they were rai.sed from .seeds which underwent pretreatment with the plant extracts and leachates. This was measured in terms of ischolar_main length, shoot length, total leaf area, fresh weight and dry weight of plants. Leaf extract and leaf leachateinduced reduced germinability and suppressed activities of catalase and dehydrogenase enzymes being the important phytotoxic indices, it can be concluded that Lantana can potentially render phytotoxic action on Mimosa.

Keywords

Lantana Camara, Mimosa Pudica, Phytotoxicity.

Full Text

     

U. K. Kanp ¹, R. K. Bhakat ¹, R. K. Das ¹, A. Bhattacharjee ²

Affiliations
1 Department of Botany and Forestry, Vidyasagar University, Midnapore-721 102, West Bengal, IN
2 Department of Botany, Burdwan University, Golapbag-713 104, West Bengal, IN

Abstract

AUelopathic effects of Amarnntluis spinosia: on normal and forcedly aged seeds were established from some reliable physiological and biochemical parameters. Leaf extract and leachate of Amaranthus strongly reduced the percentage and speed of germination in both acceleratedly aged and non-aged seeds. While sugar and amino acid levels were rapidly increased in the leachate of seeds pretreated with leaf extract and leachate, protein and RNA levels and catalase and dehydrogenase activities were significantly reduced. Inhibitory action was much more prominent in aged .seed samples than nonaged ones. The present paper thus discusses this differential allelopathic action at normal and stressful (accelerated ageing) conditions.

Keywords

Allelopnthy, Amaranthiis Spinoaus, Horse Gram, Leaf Extract, Leaf Leachate.

Full Text

     

S. Tewari , A. Bhattacharjee

Abstract

Thin films of Cadmium Sulphide (CdS) and the sandwich structures of CdS in Ag electrodes (Ag/CdS/Ag) are prepared by thermal evaporation technique at different substrate temperatures. Investigations on the frequency dependant di-electric properties of the film as a function of the substrate temperature of deposition are carried out. The investigation reveals that there is hopping type of conduction in the CdS film. The nature of variation of A.C. conductivity agrees well with correlated barrier-hopping (CBH) model. The dielectric and impedance spectra indicate multi-relaxation behavior in the sample.

Keywords

Cadmium Sulfide, Thin Films, Thermal Evaporation, Electrical Properties, Na.c. Conductivity

Full Text