Avatar for Sourav Pan

Sourav Pan

Founder of Biology Notes Online, Biology & Microbiology Educator, M.Sc. in Microbiology
Expertise
Microbiology, Immunology, Cell Biology, Molecular Biology, Genetics, Biotechnology, Biochemistry, Botany, Zoology
Education
University of Calcutta
Profile Last Updated: August 10, 2026

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.

Types of Chromatography With their Definition, Principle, Steps, Uses

Types of Chromatography - Definition, Principle, Steps, Uses

What is Chromatography? Chromatography Definition Chromatography is a technique used to separate and analyze the components of a mixture based on their properties and interactions with a stationary and mobile phase. What is a stationary phase? What is the mobile phase? Types of Chromatography Here is the Types of Chromatography; Type of Chromatography Description Gas … Read more

Microscope Nosepiece – Explained

Microscope Nosepiece - Explained

Ever peered through a microscope and marveled at the microscopic universe it unveils? It’s like being Alice in her Wonderland, but instead of falling down a rabbit hole, you’re diving into the magical world of cells, bacteria, and more. Yet, have you ever wondered about the parts of this wonder-making machine and their functions?  Let’s focus (pun … Read more

Glass Serological Pipettes – Everythings You Need to Know

Glass Serological Pipettes - Everythings You Need to Know

Glass serological pipettes are usually described as long, cylindrical measuring tools used for transferring the Liquid volumes that are needed in Cell Culture work, And many other wet-lab procedures, and it is worth mentioning that they are typically calibrated for delivering (TD) readings with graduations marked clearly,even if the spacing sometimes looks tight. These pipette’s … Read more

Types of Centrifuge – Definition, Principle, and Applications

Types of Centrifuge, Definition, Principle, and Applications

A centrifuge can define as a laboratory device that use rapid rotational Force to separate component’s of a mixture based on their Density difference’s, and it is considered a key Instrumentation in many biological / chemical workflows. What is Relative Centrifugal Force (RCF)? Relative​‍​‌‍​‍‌​‍​‌‍​‍‌ Centrifugal Force (RCF) is the effective acceleration a particle experiences in … Read more

Animal Models for Autoimmune Diseases

Animal Models for Autoimmune Diseases

Animal models of autoimmune illnesses have provided invaluable insights into the mechanism of autoimmunity, human autoimmunity, and prospective therapies. Certain inbred animal breeds develop autoimmunity naturally, and autoimmunity can also be caused by certain experimental procedures. Autoimmunity Can Develop Spontaneously in Animals Autoimmunity Can Be Induced Experimentally in Animals

Mycorrhiza – Definition, Types, Examples, Importance

Mycorrhiza - Definition, Types, Examples, Importance

What is Mycorrhiza? Definition of Mycorrhiza Mycorrhiza refers to the symbiotic association between specific fungi and plant roots, where the fungus aids in nutrient and water uptake for the plant, and in return, the plant provides the fungus with essential nutrients produced through photosynthesis. Types of Mycorrhizae Mycorrhizae represent diverse symbiotic associations between fungi and … Read more

Nitrogen Cycle – Definition, Steps, Importance, Examples

Nitrogen Cycle - Definition, Steps, Importance, Examples

What is Nitrogen Cycle? Nitrogen Cycle Definition The nitrogen cycle is a biogeochemical process that transforms atmospheric nitrogen into usable forms for living organisms and then returns it to the atmosphere through a series of biological and chemical reactions. Stages of Nitrogen Cycle Nitrogen fixation, nitrification, assimilation, ammonification, and denitrification are the steps in the … Read more

Nitrogen Fixation – Definition, Importance, Processes

Nitrogen Fixation - Definition, Importance, Processes

What is Nitrogen Fixation? Nitrogen fixation is the fundamental biological process and the first step in the nitrogen cycle. Certain bacterial species, such as Rhizobium, Azotobacter, etc., and other natural phenomena convert atmospheric nitrogen into ammonia (another type of nitrogen) throughout this process. Why is Nitrogen Fixation Necessary? It serves the following functions in nature: … Read more

Host Pathogen Interaction

Host Pathogen Interaction

Host Pathogen Interaction What is Infection? Types of Infection Infectious agents (pathogens) that cause infections include: What is Invasion? A Survey of Bacterial Invasins Spreading Factors Enzymes that Cause Hemolysis and/or Leucolysis Typically, these enzymes act on the animal cell membrane by inserting into it (creating a pore that leads to cell lysis) or by … Read more