Sourav Pan is the founder and sole author of Biology Notes Online. He holds a Bachelor of Science (B.Sc.) degree and an M.Sc. in Microbiology from the University of Calcutta. He creates educational resources covering microbiology, immunology, biotechnology, genetics, cell biology, botany, zoology, and other life-science subjects.
His goal is to make complex biological concepts easier to understand through well-structured, student-friendly articles based on academic textbooks, peer-reviewed research, and authoritative scientific sources. In addition to writing new content, he regularly reviews and updates articles to improve their accuracy, clarity, and educational value.
Kingdom: Fungi Division: Ascomycota Class: Eurotiomycetes Order: Eurotiales Family: Trichocomaceae Genus: Aspergillus Species: A. fumigatus Aspergillus fumigatus Aspergillus fumigatus can tolerates high temperatures and can thrives on decaying organic matter, Aspergillus fumigatus is widely distributed in soil, compost, indoor dust, and other environmental niches, where it is routinely detected by air sampling. Aspergillus fumigatus is classified … Read more
Although Aspergillus flavus is widely distributed in soil and decaying plant material, it is most often associated with warm, humid agricultural environments where crops are produced. Aspergillus flavus is classified as a filamentous fungus within the genus Aspergillus. When stored grains (maize/peanuts,cottonseed) are exposed to moisture and heat, contamination is caused frequently by this fungus … Read more
A Desert Ecosystem is a system in which living things (plants, animals, microbes) interact with non-living parts (soil, air, water, temperature) in a region that is extremely dry. It is defined by very low rainfall (often less than about 250 mm per year), and scarcity of moisture is a crucial limiting factor. The system is … Read more
Polymerase chain reaction or PCR is a laboratory technique that is used to make multiple copies (millions or billions!) of a specific region of DNA in vitro (in a test tube rather than an organism).
A real-time polymerase chain reaction (real-time PCR) is a conventional polymerase chain reaction (PCR) based laboratory technique used in molecular biology for real-time monitoring of the amplification of a targeted DNA molecule during the PCR, not at its end, as the conventional PCR do.
What is cellulose? (C6H10O5)n Cellulose Molecular Weight/ Molar Mass 162.1406 g/mol Density 1.5 g/cm³ Appears White powder Melting Point 260–270 °C Properties of cellulose Structure of cellulose What are cellulases? Cellulases are a group of enzymes that catalyze the hydrolysis of cellulose, a complex polysaccharide present in plant cell walls. These enzymes are largely produced … Read more
In molecular biology Western blotting is a rapid and sensitive assay for detection and characterization of proteins. This technique exploits the inherent specificity of antigen-antibody interaction to identify specific antigens by polyclonal or monoclonal antibodies.
Organic waste adds to greenhouse gas emissions, soil and water contamination, and other environmental problems. Composting, anaerobic digestion, and vermicomposting are among the methods that can be used to manage organic waste. What is Organic waste? Organic waste refers to any waste material that originates from living organisms or their byproducts. This waste can be … Read more
What is lignin? Lignin is a complex, high-molecular-weight polymer made mostly of phenolic compounds. It is found in the cell walls of vascular plants, especially in the secondary cell wall during the development of xylem, phloem fibres, and sclerenchyma cells, which give the plant strength, support, and waterproofing. It is made up of three main … Read more
Brucella is an intracellular parasite which causes epizootic abortions for animals, and septicemic febrile disease or localized infections of tissues, bones or organ systems of humans. Brucella species are very meticulous and require a rich nutrient environment to develop. Additionally, Brucella species are highly infectious, and therefore extreme caution should be exercised when handling.
