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 Inverted Fluorescent Microscope? Ever peeked into the world of living cells? Scientists use a nifty tool called an inverted fluorescent microscope for this. Unlike regular microscopes, this one flips the script—literally. Imagine the lenses sitting above the sample and the light source shining from below. This upside-down setup makes it perfect for studying cells chilling at the bottom … Read more
Objects are magnified under compound microscopes are mounted onto microscope slides. Made from plastic or glass Slides measure approximately 1×3 inches in size and range from 1mm-1.2 millimeters thick.
Microscopes have been around for the ages. Roman philosophers had mentioned “burning glass” within their works. However, the first microscope of this type was not invented until the 1300’s. Two lenses were set on opposite sides of the tube. This tube of magnifying power was the basis for our modern-day microscope.
Digital microscopes are modern microscope which does not have an eyepiece. This is a huge contrast from an optical microscope. Digital microscopes have an electronic camera that acts as the detector as well as the imaging output gadget. It displays the images takes place via a computer’s screen or monitor, which defines the scope of the microscope’s digital.
This is a form of digital Microscope which is connected to a computer using an USB port. It operates on low power. The camera is fitted with a powerful macro lens. Additionally, they have an integrated LED light that is built into the lens.
The AFM, also known as the atomic force microscope (AFM) is a sort scanner probe. Its principal functions include measuring characteristics like height, magnetism and friction.
The oil immersion method enhances the resolving power of a microscope, enabling light microscopy to distinguish finer details. Immersion oil—clear and colorless, having a refractive index of about 1.515—is placed in between the lens and the specimen. The refractive index is higher; therefore, less light is refracted. If less light is refracted, then less is … Read more
Now, let’s cover the TEM. The best way to get to know the TEM is to understand where and why you’d use one. When would you ever need to see something so small that light can never penetrate it? It’s like staring at an ant—but in space. This is not a microparticle microscope you’d find … Read more
A scanning electron microscope (SEM) produces high-resolution images from an electron beam that scans a focused beam over the surface of a specimen. The benefit of using electrons as opposed to an optical light microscope is that, due to electronegativity, the resultant interactions with the orbitals surrounding the atom create signals that indicate surface morphology … Read more
What is phase contrast microscopy? Okay, so picture this: back in the 1930s, scientists were struggling to study things like living cells or bacteria under a microscope. Why? Because those tiny critters are practically see-through! You couldn’t get a clear look without dunking them in harsh dyes—which, you know, kinda killed them. Not exactly helpful if you … Read more
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