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The monosaccharide
browser allows you to view space filling
Fischer projections of monosaccharides. You can edit the structure
and discover the correct name or you can select names from the
classified index to discover the structure. The structure can be
edited by choosing between aldose/ketose, number of carbon atoms
between 3 and 6 and by clicking on carbon atoms to alter
chirality.
Technical Information
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The Monosaccharide
Browser is implemented as a Java applet. I've
tested it with Netscape 4.5 and Internet Explorer 5.0 but it should
work with other Java enabled browsers. If you don't see a picture
of glucose at the top of this page your browser may not be Java
enabled.
Study Aid
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The Monosaccharide Browser can be used as a study aid in various
ways.
- Make a random monosaccharide by clicking on the controls with
the mouse but cover the name with your hand - practice naming the
sugar before you reveal the correct name.
- Pick the name of a monosacharide and build it by selecting the
correct type of sugar and by clicking on the chiral carbon
atoms.
- Pick two monosaccharides from a metabolic pathway, select the
name of the first sugar and then work out which structural changes
you need to make to convert it into the second sugar. (E.g.
D-Glucose to D-Galactose, D-Glucose to D-Fructose etc.)
- Look at the cyclic structures of monosaccharides in your text
book and use the Monosaccharide browser to build the straight chain
form.
These activities could be more effective with a study
partner.
Space Filling Fisher Projections
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A conventional Fischer
projection is a flat stick drawing of the
molecule which preserves information about chirality. The bonds of
the carbon skeleton are shown vertical and other bonds are
horizontal. The three dimensional structure can be reconstructed in
the mind by imagining the vertical bonds bending back (into the
page) and the horizontal bonds bending forward (out of the
page).
The images in the browser are Space Filling Fischer projections.
The atoms are represented as spheres but the molecule has been
flattened out as for a stick type Fischer projection. Side atoms
are shown slightly forward to remind the viewer of the correct
chirality.
The animation illustrates the Fischer projection using D-Glyceraldehyde.
A proper space filling model rotates.
Squashes Flat.
Fades to reveal stick Fischer projection.
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