Gangavarapu Subrahmanyam (The
Maharaja Sayajirao University, Vadodara, India)
"Bacteriology of miliolite, a bioclastic limestone: Diversity and their possible potential activity in weathering of miliolite"
Soil genesis is a
dynamic and complex geo-ecological process. Weathering of the parent
material depends on physical chemical and biological factors and their
interlinking however biological role in weathering is not yet fully
established.In the present investigation microbial activity, diversity,
physiology and mechanisms underlying in the weathering of miliolitic
limestone were elucidated by undertaking integrative approach.
Staphylococcus sp., Bacillus sp. and Actinomycetes sp. were abundantly
distributed in miliolite. The principle mechanism involving in bacterial
mediated miliolite dissolution was found to be organic acid production.
Calcite dissolution was confirmed by XRD pattern. In situ microcosm
experiments revealed the bacterial activity in dissolution of calcite.
Erosion of miliolite was well documented by SEM. Results obtained from
bacterial physiology indicated that these bacterial species were able to get
nutrients form miliolite as a result miliolite weathering occurs.