soil Archives | Microbe Notes

Soil Formation (Pedogenesis)- Factors, Process/Steps, Examples

November 1, 2020 by Anupama Sapkota

Soil Formation Definition Soil formation or pedogenesis is the process of evolution of soil under the influence of various physical, biological, climatic, and geological factors. Soil formation occurs via a series of changes to the parent material, all of which lead to the formation of layers of soil, also called soil horizons. These layers can then be separated on the …

Soil- Definition, Composition, Properties, Types and Uses

October 31, 2020 by Anupama Sapkota

What is Soil? Soil is a biologically active porous medium that is present on the uppermost layer on the uppermost layer of the Earth’s crust formed by weathering processes under various influences. Soil acts as a substratum for life on Earth that serves as a reservoir of water and nutrients, a medium for the breakdown of organic materials, and as …

Isolation of Actinomycetes from Soil sample

February 4, 2021November 6, 2018 by Sagar Aryal

Actinomycetes are classified as a group of gram-positive bacteria that are unique for their spore forming abilities and formation of mycelia structures. They show marked chemical and morphological diversity but form a distinct evolutionary line of organisms that range from coccoid and pleomorphic forms to branched filaments. These bacteria have been noted to serve as rich reservoirs of medicinal antibiotics …

Isolation of Bacillus thuringiensis (Bt) from Soil sample

February 4, 2021November 5, 2018 by Sagar Aryal

Bacillus thuringiensis (Bt) is an ubiquitous, Gram-positive and sporulating bacterium that synthesizes insecticidal proteins with specificity against a wide range of insects during sporulation (Cry and Cyt) and vegetative growth (Vip and Sip). These proteins have portrayed Bt as an environment-friendly alternative to chemical insecticides. Principle of Isolation of Bacillus thuringiensis Widely used methodologies to isolate Bt from soil consist of a thermal shock …