December 7, 2010

Photographing High Contrast Scenes

High contrast scenes have always been difficult to photograph mainly because the contrast range is usually beyond the capabilities of film. With the advent of digital cameras and their surge in popularity, it was only a matter of time before technology evolves to make this more readily possible. Now, there is a new electronic technique to capture high contrast scenes.

Called HDR for High Dynamic Range Imaging, the process basically requires a series of photos of the same scene, but exposed for different brightness and contrast levels. These alternately capture highlight, midpoint, and shadow details which are combined through software and blended to produce a single photograph incorporating all the fine details.

December 20, 2010

Animal Cloning

Cloning is the latest and most complex form of assisted reproductive technology although it has been around for quite sometime in various forms. Today, the most frequently used form is known as the Somatic Cell Nuclear Transfer or SCNT. In animal cloning, the genes of the donor animal are inserted into an egg cell that has had its nucleus removed. After a few procedural steps in the laboratory, the egg cell is implanted into a surrogate dam where it develops just like a regular embryo. Livestock breeders use the term dam to refer to the female parent of an animal.

An animal clone is in essence an exact genetic copy of a donor animal. Clones are just like identical twins that were born at different times.