Synchrotron - a modern source of X – rays (DESY, Hamburg)
![](../images/xrays6.jpg)
The X-radiation produced in cyclotrons possesses many properties which simply cannot be achieved
using conventional sources such as X-ray tubes. Here, the beam of electron traveling with velocities close to the
velocity of light, produces an intense and well collimated radiation,
every time the beam is deviated from a straight-line trajectory (like
the radio-waves from ionized matter circulating a black hole in quasars).
Röntgen's rays in biology - structure of a protein
![](../images/xrays9.jpg) Credits: DESY, Hamburg
|
How does DNA look like?
![](../images/xrays7.jpg)
Encyklopedia Fizyki Wspó³czesnej, PWN,
Warszawa, 1983 |
![](../images/xrays8.jpg) DESY, Hamburg |
X-ray diffractogram of DNA (its Na salt) and of a complex protein
The shape of DNA was not discovered by any
super-biological microscope but by Physics methods.
J.D. Watson and F.H.C. Crick in 1958
observing quite a complicated X-ray interferograms of the
DNA crystals, wondered if it were a single or a double
spiral. Finally, their choice was correct what awarded them
with a Nobel prize in 1962. |
|