Polyamines (PAs) are ubiquitous substances considered to be bioregulators of numerous cell functions; they take part in cell growth, division, and differentiation. These biogenic amines are also involved in tissue repair and in intracellular signaling; in fact, because of their polycationic character, they interact to a large extent with membrane phospholipids and may play an important role in ...

Available clinical data on aspirin-sensitive asthma (ASA) indicate that ASA patients have certain disturbances in the nervous, endocrine, immune and other body systems. It has been found that such patients have a lower melatonin (MT) production in daytime, a pathology of the platelet membrane-receptor complex, and a pathological response to exogenic MT and acetylsalicylic acid. A hypothesis has...

Mayr A. & Mayr B. 1999. A new concept in prophylaxis and therapy: paramunization by poxvirus inducers. Pesquisa Veterinária Brasileira 19(3/4):91-98. Lehrstuhl für Mikrobiologie und Seuchenlehre der Tierärztlichen Fakultät der Ludwig-Maximilians-Universität München, Veterinärstraße 13, D-80539 München, Germany. The so-called primitive, innate or paraspecific immune system is the phylogeneticall...

Herbicide safeners are chemicals used for manipulating the tolerance of large-seeded grass crops to selected soil-applied herbicides. The physiological interactions of herbicides and their respective safeners are characterized by the following facts: a) safeners are most effective when applied prior to or simultaneously with the herbicides whose injury they prevent; b) safeners exhibit a high d...