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Migration!

The LIONS have been recently and suddenly forced to migrate with the wildebeests to new web server software, so everything is kinda messed up in the LION DEN right now.

HINT: Change the URL from "lionden.com" to "lionden.info" to view the old "legacy" Lion Den (until I get this one fully tamed).

 

Our sincere apologies!

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Chemistry Models

A&P 1

Bohr models

Helium

Bohr model of the helium (He) atom.  He has two protons in the nucleus and two electrons in its single energy level.

From http://course1.winona.edu/sberg/Free.htm

 

periodic chart

This (partial) periodic chart shows incomplete Bohr models (no nucleus). Here, the energy levels are called "shells." 

From http://course1.winona.edu/sberg/Free.htm

 

Electron Cloud Model

helium electron cloud animation

The electron cloud model shows electrons moving in a cloud around the nucleus.

From http://course1.winona.edu/sberg/Free.htm

hydrogen electron cloud animation

In this covalent bond, two H atoms "share" their single electrons, to form a pair of shared electrons.

From http://course1.winona.edu/sberg/Free.htm

 

Water Molecule

water models

Three models of a water molecule (polar). From left: stick (structural) model, Bohr model, space-filling (cloud) model.

From http://course1.winona.edu/sberg/Free.htm

 

Molecules in Water (Solution)

glucose in solution

In this space-filling model, glucose (center molecule) is a polar molecule with unequal sharing of electrons.  It dissolves easily in water because the positive regions of a water molecule are attracted to glucose's negative regions and the negative regions of a water molecule are attracted to glucose's positive regions --so they "get along." The dashed lines represent hydrogen bonds, which which are weak electrochemical attractions that form and reform in a liquid solution.

From http://course1.winona.edu/sberg/Free.htm

 

sodium in waterchloride in water

Ions, too, "get along" with water just fine!

Click on each image to enlarge

From http://course1.winona.edu/sberg/Free.htm

 

Glucose Molecule

glucose structural  modelglucose space filling model

Two models of a glucose molecule: structural and space-filling.

From http://course1.winona.edu/sberg/Free.htm

 

Phospholipid Molecules

phospholipid structural modelphospholipid simple model

Left: Structural model of a phospholipid

Right: Stick figure of a phospholipid

From http://course1.winona.edu/sberg/Free.htm

 

phospholipid bilayer

Phospholipid bilayer (a simple model)

From http://course1.winona.edu/sberg/Free.htm

 

modern bilayer model

Phospholipid bilayer (a current detailed model)

Click image to enlarge

 

Cholesterol Molecule

cholesterol structural model

Cholesterol (its steroid "core" or nucleus is highlighted)

 

Tertiary Protein

hemoglobin beta chain (tertiary protein)

Computer (ribbon) model of a tertiary protein (hemoglobin beta unit)

Click image to enlarge

 

Quaternary Protein

Hemoglobin quaternary protein (tetramer)

Computer (ribbon) model of a quaternary protein (hemoglobin)

 Check out this odd-shaped protein: click here

 

Allosteric Effect

allosteric effect animation

The allosteric effect in enzyme action.

From http://course1.winona.edu/sberg/Free.htm

 

DNA Molecule

DNA structural model

DNA molecule (left) is made up of nucleotides. Each DNA nucleotide is a sugar (deoxyribose), phosphate, and a base (A, C, T, or G).

adenine structural model

Adenine, represented as simply "A" in the DNA model above, actually looks something like this.

DNA rotating animation

Animated, simplified space-filling model of DNA shows the "twisted ladder" shape of the double helix.

From http://www.animationfactory.com

ATP Molecule

ATP structural model

ATP (adenine triphosphate) is a modified adenine-containing nucleotide. (see model of adenine above)

 

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This page updated on 13-jan-14