Welcome to Biology Notes Online! We are the BNO Team, dedicated to providing high-quality, accessible biology study notes for students and teachers alike. Our goal is to simplify complex biological concepts and present them in an easy-to-understand format, entirely free of charge. Whether you're preparing for exams, teaching a class, or simply passionate about biology, our comprehensive notes are designed to support your learning and teaching journey.
What is Reticulocytes? Reticulocytes are immature red blood cells (erythrocytes) that have not yet completed the final stages of maturation. They are usually produced in the bone marrow and have a characteristic reticulated (network-like) appearance when stained with special dyes. Reticulocytes are important in the evaluation of anemia, as they provide information about the bone … Read more
Haemocytometry is a quantitative method that quantifies the RBC count in blood samples. The manual method of counting RBCs is the Haemocytometer (or Neubauer’s chamber slides). Modern devices, such as photometric and electrometric counters, can be more precise or automated. They can count the cells in the blood sample. It is impossible to count the … Read more
Hemoglobin, often abbreviated as Hb, is a vital protein found in red blood cells (RBCs). Its primary role in the human body includes the transport of oxygen from the lungs to various tissues and the transfer of carbon dioxide from tissues back to the lungs. Additionally, hemoglobin plays a significant role in maintaining the pH … Read more
Cross Match is a laboratory test, performed prior to a blood transfusion to determine whether donor blood is compatible (or incompatible) with recipient blood.
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).
The concept of Blood grouping was first discovered by Karl Landsteiner in 1901, who was an Austrian-American immunologist and pathologist. He received Nobel Prize in Physiology or Medicine in 1930 for this discovery.
Staining protein gels using Coomassie Brilliant Blue R-250 is common to see proteins that are resolved using SDS-PAGE. It is extremely sensitive and suitable for long-term storage of gels.
A well-established microbiology laboratory is necessary for the work of microorganisms. The students/researchers/scientists must follow the basic rules while working with microorganisms.
A microscope comes with an objective of 10X (low power) 45X (high power) and 100X (oil immersion). and the ocular lens with 5X, 10X and 15X. In general, an 10-X ocular lens is used in most cases. If an animal can be clearly seen with 10X ocular lens and 45X objective, this means that the size is 10×45, which is 450 times larger than the standard one. We don’t know the exact measurement is ? It could be determined using an calibrated scale. Thus the calibration of all lenses (eyepieces) is performed.
Giolitti Cantoni Broth Base with the addition of potassium tellurite is utilized to enrich selectively Staphylococcus aureus, a food-borne pathogen, from suspected items, according to ISO.
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