Guide to the Identification of Poplar Cultivars on the Prairies

This paper provides those who work with poplars in the prairies region of Canada with an easy-to-use leaf and twig key and detailed morphological descriptions of the more commonly planted cultivars. Recommendations for their use, notes on growth, natural pruning, susceptibility to insects and diseases, and tolerance to climatic extremes are also provided

Feasibility of Commercial Vegetable Production in Western Iowa as a Boost to Agricultural and Rural Development

Yield and quality of several kinds of vegetables grown on plots in Iowa\u27s Missouri River Valley were high, indicating great potential for commercial production of high-value crops. The availability of water; the light, fertile soils present in parts of the Valley and the reasonably long growing season make the Valley potentially an even greater food-producing area than it is presently. Commercial vegetable production in the Valley could be expected to increase farm income, stimulate the economy of local small towns, and reduce the migration of rural people to urban areas

Zebrafish as a model system for characterization of nanoparticles against cancer

Animal science

Involvement of growth hormone-insulin-like growth factor I

The role of growth hormone (GH) and insulinlike growth factor-I (IGF-I) in the tissue remodeling associated with the transition of a symmetrical larva to an asymmetrical juvenile during flatfish metamorphosis is unknown. In order to investigate the potential role of these hormones in the remodeling of cranial bone and soft tissue that accompanies eye migration during metamorphosis of Atlantic halibut (Hippoglossus hippoglossus) larvae, tissuespecific gene expression was monitored by in situ hybridization for Atlantic halibut type I growth hormone receptor (hhGHR), type II hhGHR, and insulin-like growth factor-I receptor (hhIGF-IR). Polyclonal antibody generated against the extracellular domain of type I hhGHR was used for the immunohistochemical localization of type I GHR protein. Type I hhGHR, type II hhGHR, and hhIGF-IR mRNA were expressed in fibroblasts, frontal bone osteocytes, and dorsal chondrocytes at the onset of metamorphosis (stage 8),during metamorphic climax (stage 9), and in fully metamorphosed juveniles (stage 10). Type I GHR protein showed similar expression patterns to those of type I hhGHR mRNA, except in chondrocytes in which little GHR protein was detected. The localization of GHR and IGF-IR transcripts and GHR protein in cranial structures that undergo remodeling is intriguing and suggests that, in addition to thyroid hormones, the GH-IGF-I system is involved in morphological transformations during metamorphosis in Atlantic halibut.We thank Heiddis Smáradóttir, Arnar Jónsson, and Øystein Saele for larval sampling, and Nádia Silva for methodological assistance