Biology Reference
In-Depth Information
However, whether
is positive or negative cannot be specified.
A triple
product is needed to determine the sign of
if
then
if
then
The angle thus calculated is in the old convention, if positive. If negative,
add 360
0
to get the value in the old convention.
To express
in the new
convention, subtract 180° from that value.
Similarly, since the
angle is the angle between planes
and
we have:
Again, a triple product is needed to determine the sign of
if
then
if
then
Also, the angle thus calculated is in the old convention, if positive. If
negative, add 360° to get the value in the old convention.
To express
in
the new convention, subtract 180° from that value.
AN EXAMPLE
Consider a typical set of Cartesian coordinates for non-hydrogen atoms C
-1
,
N ,
C and N
+1
as listed in Table 5-2.
