Trembling aspens (Populus tremuloides) are among the world’s most remarkable trees, forming vast clones that can live an improbably long time. These clones share a common root system, from which new trees arise, cover up to 43 hectares and persist up to a million years. The vigor of these ancient plants belies their years, leading to speculation that they defy aging or senescence. But demonstra...

artemisia deserti krasch (a. deserti), artemisia aucheri (a. aucheri) and artemisia sieberi besser (a. sieberi) are three members of asteraceae (compositae) family, which grow widely in the even and high areas of birjand, iran. this study has attempted to compare the total antioxidant capacity of methanol extracts of these three plants using dpph (1,1-diphenyl-2-picrylhydrazyl) radical scavengi...

Steroidogenic acute regulatory protein (StAR)-related lipid transfer (START) domains were first identified in cholesterol-binding StAR orthologs from mammals. They are also found in plant proteins, where they are predicted to mediate transport and signaling of lipids. START domains in combination with the homeodomain (HD) DNA-binding motif are unique to plants. Recent genetic analysis of the HD...

Activity-dependent alterations in the strength of an individual glutamatergic synapse are often accompanied by changes in the size and shape of the postsynaptic terminal. Two studies in this issue of Neuron, Meyer et al. (2014) and Bosch et al. (2014), shed new light on the mechanisms and signaling pathways underlying structural long-term potentiation.

A recognizer is a computer program for locating objects of known classes within a complex signal. Best known examples include speech recognition and character recognition (OCR) systems, but an argument is made that the techniques apply in a broad spectrum of applications. This paper discusses the recognizer development process. Topics addressed include training sample collection, feature detect...