Demographic and social change in the Durham Coalfield

SIGLELD:9350.106(CRU-WP--23) / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Demographic and social change in the Durham coalfield Part 3: birthplace and migration 1851-1881

SIGLEAvailable from British Library Lending Division - LD:9350.106(CRU-WP--25) / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Computer mapping and analysis of the 1971 census of Great Britain

SIGLELD:8318.172(SSRC-HR--2221). / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Salicylic Acid Biosynthesis and Metabolism

Salicylic acid (SA) has been shown to regulate various aspects of growth and development; it also serves as a critical signal for activating disease resistance in Arabidopsis thaliana and other plant species. This review surveys the mechanisms involved in the biosynthesis and metabolism of this critical plant hormone. While a complete biosynthetic route has yet to be established, stressed Arabidopsis appear to synthesize SA primarily via an isochorismate-utilizing pathway in the chloroplast. A distinct pathway utilizing phenylalanine as the substrate also may contribute to SA accumulation, although to a much lesser extent. Once synthesized, free SA levels can be regulated by a variety of chemical modifications. Many of these modifications inactivate SA; however, some confer novel properties that may aid in long distance SA transport or the activation of stress responses complementary to those induced by free SA. In addition, a number of factors that directly or indirectly regulate the expression of SA biosynthetic genes or that influence the rate of SA catabolism have been identified. An integrated model, encompassing current knowledge of SA metabolism in Arabidopsis, as well as the influence other plant hormones exert on SA metabolism, is presented