Catalyst University
Biotechniques | Principles of SDS-PAGE (Protein Separation)
As always, the steps of an SDS-PAGE will depend on your specific lab and protocol. In this video, we will explore the general theory of separating and visualizing protein by SDS-PAGE, a technique very similar to DNA agarose gel...
Catalyst University
Light-Harvesting Photosynthetic Pigments and Exciton Transfer
Light-Harvesting Photosynthetic Pigments and Exciton Transfer
FuseSchool
Formulae of Organic Molecules
Learn the basics about Formula of organic molecules. What is a chemical formula? How do you draw a formula of organic molecules? Find out more in this video!
NASA
NASA | Taking on Titan: An Interview with Carrie Anderson
When she was a little girl, Carrie Anderson dreamed of becoming an astronomer. Now, as a space scientist at NASA Goddard Space Flight Center, Carrie studies the atmosphere on Titan, one of Saturn's moons and the second largest moon in...
Professor Dave Explains
Examples of s-p Mixing in Molecular Orbital Theory
Admittedly, my prior tutorial on MO theory was a little confusing, and had some errors. I wanted to make things right, so here's another one! This will clarify some of the basic concepts, and will also extend them to discuss a new...
msvgo
Electric Dipole
It explains about the electric field dipole,,expression on field of an electric dipole using Coulomb's law and superposition principle,significance of dipoles and,word problems.
Visual Learning Systems
The Periodic Table: Elements and Atoms
This program makes the Modern Periodic Table come alive to students. Numerous real-life examples of elements are exemplified in the table. Animations and graphics illustrate concepts not easily achieved through other instructional...
Professor Dave Explains
Will Synthetic Vitamins Make Me Explode?
The words natural and synthetic are thrown around a lot these days, when talking about foods, medicine, and other things. But what do they really mean, and how are they different? Is one necessarily better than the other? Can the...
Professor Dave Explains
Practice Problems: Labeling Carbons
What's with this hierarchy? Primary, secondary, tertiary... can't all carbons be equal? Well, no. We need to be able to label the degree of substitution of any carbon in an organic molecule so that we can make predictions about the...
Professor Dave Explains
Practice Problem: Types of Protons
We learned about how pairs of protons can have specific relationships. They can be homotopic, enantiotopic, diastereotopic, or heterotopic. Let's apply this to some examples!
Professor Dave Explains
Hydrohalogenation, Hydration, Dihalogenation
An overview of several addition reactions.
NASA
NASA | Mars Atmosphere Loss: Sputtering
How did Mars, a once wet planet, lose its early atmosphere? One possibility is through a process called "sputtering," in which atoms are knocked away from the atmosphere due to impacts with energetic particles.
Professor Dave Explains
Practice Problem: Electrophilic Aromatic Substitution Retrosynthesis
You gotta know your EAS reactions for this one! Make sure you do them in the right order, too.
NASA
A Titan Discovery
NASA Goddard scientists have made an exciting discovery on Saturn's largest moon, Titan. The team has definitively detected the molecule acrylonitrile in Titan's atmosphere - a finding that has astrobiological relevance. Credit: NASA’s...
Catalyst University
CYP2E1 Mechanism Part 2: Conversion of Ethandiol to Acetate
CYP2E1 Mechanism Part 2: Conversion of Ethandiol to Acetate
NASA
NASA | The Molecule Dissector - Mass Spectrometry
What do you do if you have a sample from another planet, and you want to find out if it contains a certain molecule...maybe even one that will reveal that the planet can sustain life? When scientists face a situation like this, they...
Catalyst University
Mechanisms of Oxygen Dissociation from Hemoglobin
In this video, we discuss 4 mechanisms by which oxygen's affinity for hemoglobin decreases, facilitating increased oxygen delivery to tissues. [1] Heat [2] Bohr Effect [3] Haldane Effect [4] 2,3-BPG
Professor Dave Explains
Practice Problem: Site of Protonation on a Weak Base
For this one we will need to understand the basics about Bronsted-Lowry acid-base reactions, and we also should be able to gauge the stability of various potential conjugate bases.
Catalyst University
BASICS of Glycolysis and the Krebs Cycle - Production of ATP, NADH, & FADH2
In this video, we discuss the basic functions of glycolysis and the Krebs cycle in producing ATP, NADH, and FADH2, of which the latter two power the electron transport chain.
Professor Dave Explains
Practice Problem: Ozonolysis Reactions
Ozone isn't just for shielding us from harmful UV radiation! It's a handy-dandy synthetic tool. Try these on for size.
Professor Dave Explains
IIT/JEE Chemistry Practice #18: Intermolecular Forces
Practice REAL problems from actual past IIT/JEE exams with Professor Dave!
Catalyst University
Biochemical Mechanism of the Smell of Death | How do Bodies Decay?
In this video, we will discuss the stages of corpse decomposition and also the molecules (and their biosynthetic pathways) that contribute to the smell of a dead, decaying body.
NASA
Ancient Organics Discovered on Mars
Since arriving at Mars in 2012, NASA's Curiosity rover has drilled into rocks in search of organics - molecules containing carbon. Organics are the building blocks of all life on Earth, though they can also come from non-living sources....