Background: The major bottleneck for determination of 3 D structures of proteins using X-rays is the production of diffraction quality crystals. Often proteins are subjected to chemical modification to improve the chances of crystallization Results: Here, we report the successful crystallization of a nuclease employing a reductive methylation protocol. The key to crystallization was the success...

Prior to the 1950s the prevalent view of the ancient Maya was as a peaceful people. ln 1952, Robert Rands completed his Ph. D. thesis on the evidences of warfare in Classic Maya art, following up on the important work just completed by Tatia-na Proskouriakoff (1950). Since then, research has rapidly accumulated substantial documentation that the Maya were in fact warlike (cf. Marcus 1974; Repet...

Leaf-cutting ants are well known for their highly complex social organization, which provides them with a strong defense against parasites invading their colonies. Besides this attribute, these insects have morphological, physiological and structural characteristics further reinforcing the defense of their colonies. With the discovery of symbiotic bacteria present on the integument of leaf-cutt...

The formation of electronic warfare is mutually conditioned by the dynamics struggle means attack and defense. Electronic combat, which a form operational combat support, has become new element content operations operations. One main directions development means, complexes methods improvement base technical solutions in construction equipment. Another direction associated with change conceptual...

Background and aim: Chronic skin lesions are common late complications of sulfur mustard intoxication which would result in numerous complaints including pruritus, skin dryness and burn feeling. In chemical warfare injured veterans, pruritus is the most common complaint in chronic status with significant effects on patient's quality of life. This study has evaluated efficacy of topical ph...

In this research urogenital complications of 300 veterans with the average age of 32.7+_6.5 years were studied for two years( 1995-1996) . They were selected randomly in Kerman province based  on having at least one exposure to chemical warfare, six to ten years before the study. The control group was selected among the troops whom were not exposed to chemical warfare and had an average age of ...

Conventional approaches to defensive information warfare (IW) focus primarily on physical security, electronic countermeasures and encryption techniques. These areas focus on preserving system availability and data secrecy. However, these areas control only a small subset of the range of impacts that information warfare attacks can have on information data quality attributes provided to users. ...