ELECTRON STAINS

Electron Stains

Chemical studies have been carried out on the interaction of DNA with uranyl salts. The effect of variations in pH, salt concentration, and structural integrity of the DNA on the stoichiometry of the salt-substrate complex have been investigated. At pH 3.5 DNA interacts with uranyl ions in low concentration yielding a substrate metal ion complex with a UO(2) (++)/P mole ratio of about (1/2) and...

Stains Other Than Blood-Stains as Medico-Legal Evidence

On one point an important difference of opinion may exist between medico-legal workers: should a positive chemical test, in the absence of finding spermatozoa under the microscope, be accepted a& evidence of semen ? Some are in favour of doing so (Bagchi, 1937), others against (Owens, 1935; Thomas, 1937; Kamath, 1938; Glaister, 1938; McNally, 1939; Modi, 1940; Rhodes, 1940) and yet others appea...

Stains on the carpet.

One summer evening in 2004 our 11 year old son went to bed after various delaying tactics—arguments about friends who stay up later, forgetting to brush teeth, coming down for a drink of water. Shortly afterwards the dining room door opened. In he came, cupping his bleeding nose in one hand as he gripped the bridge of the nose with the other. We led him to the kitchen sink to help him clean up ...

Salt stains from evaporating droplets

The study of the behavior of sessile droplets on solid substrates is not only associated with common everyday phenomena, such as the coffee stain effect, limescale deposits on our bathroom walls , but also very important in many applications such as purification of pharmaceuticals, de-icing of airplanes, inkjet printing and coating applications. In many of these processes, a phase change happen...

Differential stains of insect tissues.