Staphylococcus aureus is a Gram‑positive, facultative anaerobic bacterium, usually found in clusters that resemble grapes and typically 0.5–1µm in diameter. Harbor, as a commensal organism, in the human nasal passages, skin, and mucous membranes of 20–30% of people without causing disease It is an opportunistic pathogen that can cause a wide range of infections—from simple … Read more
The phyllosphere refers to the entirety of a plant’s above-ground surface, which provides a habitat for microorganisms, particularly in the aerial components such as leaves, stems, flowers, and fruits. Phyllosphere Microorganisms – These are microbiological entities that inhabit the aerial surfaces of plants, particularly the leaf surface (phylloplane). What is Phyllosphere? Phyllosphere – the aerial … Read more
What is Pedogenesis? Pedogenesis is the natural process of soil formation resulting from the interplay of physical, chemical, biological, and climatic elements throughout time. Chronology – In 1883, Vasily Dokuchaev posited that soil is a product of climate, vegetation, parent material, and temporal factors. In 1941, Hans Jenny established the CLORPT model—Climate, Organisms, Relief, Parent … Read more
Pectin is a complicated polysaccharide that is mostly found in the cell walls of plants, notably fruits. It is a structural heteropolysaccharide made up mostly of units of galacturonic acid. Pectin is a glue that holds plant cells together, making the plant tissue strong and stable. In the culinary sector, it is often used as … Read more
Hemicellulose is a group of polysaccharides found in plant cell walls, associated with cellulose and lignin. Unlike cellulose which is a linear polymer of glucose, hemicellulose is a branched, amorphous polymer of various sugar monomers like xylose, mannose, galactose, rhamnose and arabinose. It acts as a matrix component that binds with cellulose fibrils and lignin, … Read more
What is chitin? Structure of chitin What are Chitinases? Chitinases are enzymes that catalyze the hydrolysis of the β-1,4-glycosidic bonds in chitin They belong to the glycosyl hydrolase family with EC number 3.2.1.14 Two main types exist based on cleavage mode They are produced by bacteria, fungi, plants and some animals for nutrition, defense or … Read more
A biosafety level (BSL) refers to a specific set of biocontainment measures designed to isolate hazardous biological agents within a controlled laboratory environment. This document outlines the necessary protective measures required in a laboratory environment to safeguard employees, the ecosystem, and the community from infectious agents. Historical Overview The classification of four levels of biosafety … Read more
What is Prokaryotic Cell? What is Eukaryotic Cell? Difference Between Prokaryotic and Eukaryotic Cells Feature Prokaryotic Eukaryotic Nucleus Absent; genetic material located in a nucleoid region. Present; genetic material enclosed within a nuclear envelope. Membrane-bound organelles Generally absent (e.g., mitochondria, chloroplasts, endoplasmic reticulum, Golgi apparatus). Present (e.g., mitochondria, chloroplasts in photosynthetic cells, endoplasmic reticulum, Golgi … Read more
What is Bacteria? Bacteria represent a category of microscopic, unicellular organisms that are classified as prokaryotes, characterised by the absence of a membrane-bound nucleus and organelles. These organisms are found in a wide range of habitats across the planet, including extreme environments such as deep-sea vents and arctic ice, as well as more common settings … Read more
What is Bright Field Microscope? What is Dark Field Microscope? Difference Between Bright Field Microscope and Dark Field Microscope Feature Bright‑Field Microscope Dark‑Field Microscope Image Background Bright Dark Specimen Appearance Dark/stained specimens appear visible Unstained specimens appear bright against dark Illumination Transmitted white light through specimen Oblique/scattered light; direct light blocked Contrast Mechanism Light absorption … Read more
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