The aim of the study was to determine the effects of various petroleum-derived substances, namely petrol, diesel fuel and spent engine oil, on life history traits and population dynamics of the black bean aphid Aphis fabae Scop. and on growth and chemical composition of its host plant Vicia faba L. Each substance was tested separately, using two concentrations (9 g kg-1 and 18 g kg-1). The expe...

Following a recent world wide resurgence in the desire to build and operate nuclear power stations as a response to rising energy demands and global plans to reduce carbon emissions, and in the light of recent events such as those at the Fukushima Dai-ichi nuclear power plant in Japan, which have raised questions of safety, this work has investigated the long term behaviour of concrete nuclear ...

Several mechanisms of life span extension in C. elegans have been described, including caloric restriction, reduced Ins/IGF-1 signalling, Clk mutation and germ line ablation. Here, we describe the effects of caloric restriction on metabolism and life span in C. elegans and examine whether Ins/IGF-1 signalling is involved in the life extension observed in calorically restricted worms. We show th...

criticism of public extension services has resulted in various countries seeking alternative approaches for provision of these services. in all these approaches, extension personnel are the key factors to the success of the implementation. today, agricultural extension services in turkey bear the responsibility of the ministry of food, agriculture and livestock. a number of non-public extension...

BRAD HANSON, UC Cooperative Extension Weed Specialist, Department of Plant Sciences, University of California, Davis; ALBERT FISCHER, Professor, Department of Plant Sciences, University of California, Davis; ANIL SHRESTHA, Associate Professor, Department of Plant Sciences, California State University, Fresno; MARIE JASIENIUK, Associate Professor, Department of Plant Sciences, University of Cali...

Plants from a handful of species provide the primary source of food for all people, yet this source is vulnerable to multiple stressors, such as disease, drought, and nutrient deficiency. With rapid population growth and climate uncertainty, the need to produce ...

A new technique is described for studying controlled in vitro extension of plant cell walls. This technique uses frozen-thawed Avena coleoptile segments in which turgor is replaced by a constant applied force. In this system rapid extension is induced by low pH (3.0-3.6) but not by auxins or CO(2). Extensions of over 30% have been achieved. Our results indicate that cell wall synthesis is not r...