Curated Video
Fluid mosaic model of the cell membrane
The plasma membrane is a complex structure made up of macromolecules that come together to form a fluid mosaic. In this video, we will look at the structure, properties and functions of the fluid mosaic model.
Curated Video
Diffusion
The spread of particles from an area of high concentration to an area of low concentration. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science...
Curated Video
Osmosis and Volume
We look at the effects of osmosis on the volume of potato and the appearance of red onion cells. Two cylinders of potato are measured and weighed before one is placed in salt water and the other in fresh water. We can see how osmosis...
Curated Video
Dissection: Lungs
We dissect and examine a cow\u2019s lungs. Before the dissection, the lungs are inflated to show the changes in volume that occur when mammals breathe. During the dissection the position and function of different parts are examined,...
Curated Video
Agar Cube Diffusion
We use coloured agar cubes to see how different shapes change the rate of diffusion. The cubes are made using sodium hydroxide and phenolphthalein indicator to give them a pink colour. When these are added to hydrochloric acid, the...
Curated Video
Asellus Blood Flow
We use a microscope to examine the blood flow in the open circulatory system of asellus aquaticus. We are able to see the haemolymph moving through its limbs in different directions. Biology - Human Body - Learning Points. Large...
Curated Video
Precipitate Formation
We add potassium iodide and lead(II) nitrate to the opposite sides of a Petri dish filled with water to see how quickly they diffuse. When added to the water, the chemicals spread through the dish and when they meet they react to form...
Curated Video
The Cell Membrane
Journey inside the cell to see how the cell membrane acts as both a barrier and an entrance. How does it take in nutrients while keeping out potentially damaging molecules? Biology - Cells And DNA - Learning Points. The cell membrane...
Curated Video
Transporte en las Células: Difusión y Ósmosis
Este video explica cómo las células absorben sustancias útiles y eliminan desechos mediante difusión, ósmosis y transporte activo. Estos procesos ocurren a través de la membrana celular y permiten el intercambio de materiales entre las...
Curated Video
What is Diffusion? How Does it Work? What Factors Affect it? #7
This video covers - What diffusion is - How it works - How it applies to cell membranes - The 3 factors that affect the rate of diffusion (concentration gradient, temperature, surface area) Exam board specific info: KS3 All relevant to...
Curated Video
GCSE Biology - Gas Exchange and Lungs #26
Learn how the lungs and alveoli are adapted to carry out gas exchange.
Curated Video
GCSE Biology - Specialised Exchange Surfaces
This video covers: - What exchange surfaces are - The key features of exchange surfaces - Specific examples including alveoli, villi, root hair cells, and leaves
Curated Video
GCSE Biology - Osmosis #8
In this video, we cover: - What osmosis is - How osmosis works - How to understand water concentration Exam board specific info: AQA - Suitable for everyone IGCSE Edexcel - Suitable for everyone Edexcel - Suitable for everyone OCR 21st...
Curated Video
GCSE Biology - Surface Area to Volume Ratio
This video covers: - What surface area to volume ratio means - How to calculate surface area and volume - Why large organisms need specialised exchange surfaces and transport systems
Curated Video
GCSE Biology - Active Transport #9
This lesson covers: - What active transport it - How it's different to diffusion - How root hair cells are adapted to absorb mineral ions Exam board specific info: AQA - Suitable for everyone IGCSE Edexcel - Suitable for everyone Edexcel...
The Business Professor
Diffusion of Innovations Theory
What is the Diffusion of Innovations Theory? Diffusion of innovations is a theory that seeks to explain how, why, and at what rate new ideas and technology spread. The theory was popularized by Everett Rogers in his book Diffusion of...
The Business Professor
Bass Diffusion Model
What is the Bass Diffusion Model? The Bass model or Bass diffusion model was developed by Frank Bass. It consists of a simple differential equation that describes the process of how new products get adopted in a population. The model...
Curated Video
Factors Affecting Diffusion and Fixed Law
This is an educational video that discusses the factors that affect diffusion, which is the process by which particles move from an area of high concentration to an area of low concentration. The video outlines three key factors that...
Curated Video
Transport of Substances in and out of Cells: Diffusion, Osmosis, and Active Transport
In this video, the concept of transport of substances into and out of cells is explained. The different ways in which this process occurs are discussed, including diffusion, osmosis, and active transport. The importance of surface area...
Curated Video
Introduction to Diffusion: Definition, Process, and Factors Affecting Rate
This video provides an explanation of what diffusion is, how it occurs, and how to change the rate of diffusion. The concept of diffusion is demonstrated through the example of a plate of food emitting a smell that travels across a room....
National Institute of Standards and Technology
A Conversation with Dr. John Cahn
On June 24, 2011, it was announced that NIST Emeritus Senior Fellow Dr. John Cahn had been selected to receive the 2011 Kyoto Prize in Advanced Technology for his fundamental contributions to the study of materials. In this interview,...
Curated Video
Diffusion: The Movement of Particles in Liquids and Gases
This is a lecture presentation on diffusion, where the process of diffusion of particles in liquids or gases is explained in terms of kinetic particle theory. The presentation incorporates a mixture of two liquids and a demonstration...
Catalyst University
Fick's First Law (1): Diffusion, Flux, and Concentration Gradients
Fick's First Law (1): Diffusion, Flux, and Concentration Gradients
Catalyst University
Disk Diffusion Test using Bacitracin or Optochin
In this video, I explain how to determine resistance (R) or susceptibility (S) in bacteria using the disk diffusion method (with bacitracin and optochin).