Fræðaþing landbúnaðarins - 08.02.2008, Page 72

70 | FRÆÐAÞING LANDBÚNAÐARINS 5, 2008
Torkell Jóhannesson, Kristín Björg Guðmundsdóttir, Tryggvi Eiríksson, Barash Jed, Jakob Kristinsson
& Sigurður Sigurðarson, 2004. Selenium and GPX activity in blood samples from pregnant and non-
pregnant ewes and selenium in hay on scrapie-free, scrapie-prone and scrapie afflicted farms in Iceland.
Icelcmdic Agricultural Sciences 16-17, 3-13.
Torkell Jóhannesson, Krístín Björg Guðmundsdóttir, Tryggvi Eiríksson, Jakob Kristinsson & Sigurður
Sigurðarson, 2004. Copper and manganese in hay samples from scrapie-free, scarpie-phrone and
scarpie-affliced farms in Iceland. Icelandic Agricultural Sciences 16-17, 45-52.
Torkell Jóhannesson, Krístín Björg Guðmundsdóttir, Tryggvi Eiríksson, Jakob Kristinsson & Sigiuður
Sigurðarson, 2005. Molybdenum and sulphur in forage samples fforn scrapie-free, scrapie-prone and
scrapie-afflicted farms in Iceland. Icelandic Agricultural Science 18: 53-58.
Torkell Jóhannesson, Krístín Björg Guðmundsdóttir, Tryggvi Eiríksson, Jakob Kristinsson & Sigurður
Sigurðarson, 2007. Overview. Seven trace elements in Icelandic forage. Their value in animal health
and with special relation to scrapie. Icelandic Agricultural Science 20: 3-24.
Zeng, L.U., Liao, M., Cheng, L.C. & Huang, C.Y., 2007. Effects of lead contamination on soil
enzymatic activities, microbial biomass, and rice physiological indices in soil-lead-rice (Oryza sativa
L.) system. Ecotoxicology and Environmental Safety 67: 67-74