http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/575 2026-05-21T02:46:24Z http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/578 Title: STUDIES ON EFFECT OF COPPER (CU2+) ON PHOSPHATASE ENZYME ACTIVITY AND BIOMASS OF Aspergillus niger Authors: Lalruatsanga, H Abstract: Although a large number of metals are essential for growth, some can be harmful for living cells. This is because of the fact that heavy metals can form complexes with protein molecules which render them inactive. The experiment was designed to carry out the effect of heavy metal (copper) on phosphatase enzyme activity and biomass of Aspergillus niger. We have observed that CuSO4 had negative effect on the growth of Aspergillus niger, phosphatase activity and plant biomass. The effects of CuSO4 upon the growth of fungal mycelium both in solid and liquid culture was observed after 3 days of incubation. The study revealed that control attained the highest growth rate, while application of varying concentrations of CuSO4 hampered and retarded the growth of fungal mycelium correspondingly. 2019-01-01T00:00:00Z http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/576 Title: Microsporogenesis in Hydrobryum griffithii (Wallich ex Griffith) Tulsane (Podostemaceae) from North East India Authors: Lalruatsanga, H Abstract: Flowers of Hydrobryum griffithii are cleistogamous, enclosed by a thin membranous spathe. The two anthers are borne on a forked filament placed adjoining to the stigmatic lobes. The two anther primordia initiated far before the development of gynoecium and enclosed by a distinct membranous perianth lobe. The anther primordium comprises a mass of undifferentiated meristematic cells covered with a unilayered dermatogen, thus conforming to tunica-corpus concept. A row of 3-4 cells in the hypodermis differentiated into an archesporium in each anther lobe 2013-01-01T00:00:00Z