Physical and Chemical Factors Influencing the Toxicity of Inorganic Salts to Monilia sitophila (Mont.) Sacc

1914 ◽  
Vol 41 (5) ◽  
pp. 265
Author(s):  
Louis Otto Kunkel
2020 ◽  
Vol 120 (19) ◽  
pp. 10834-10886 ◽  
Author(s):  
Sang Cheon Lee ◽  
Gregory Gillispie ◽  
Peter Prim ◽  
Sang Jin Lee

PLoS ONE ◽  
2014 ◽  
Vol 9 (1) ◽  
pp. e84812 ◽  
Author(s):  
Keding Cheng ◽  
Angela Sloan ◽  
Kristen M. Avery ◽  
Michael Coulthart ◽  
Michael Carpenter ◽  
...  

Elem Sci Anth ◽  
2020 ◽  
Vol 8 ◽  
Author(s):  
Dylan Stinton ◽  
Larissa Schneider ◽  
Sara Beavis ◽  
Janelle Stevenson ◽  
William A. Maher ◽  
...  

Mercury (Hg) contamination is an environmental concern as a by-product of legacy mining in Australia. Here we investigate the spatial and temporal distribution of Hg in the Molonglo River system in New South Wales, Australia, and assess the physical and chemical factors influencing that distribution. Mercury concentrations in sediment cores were measured in conjunction with 210Pb and 137Cs dating to establish historical contamination. This was done at the source mine site of Captains Flat, New South Wales, and the system’s sink in Lake Burley Griffin, Australian Capital Territory. Additionally, surficial sediment Hg concentrations along the Molonglo River were analyzed to determine the spatial distribution of Hg. Analytical results showed the primary physical and chemical factors influencing Hg dispersion to be distance, total organic matter, and the presence of iron oxides and oxyhydroxides. The highest Hg concentrations were near the mine site at Captains Flat and decreased significantly with distance. Sediment core analyses in both Captains Flat and the lake showed reductions in Hg concentrations toward surficial sediment layers. It is suggested government-funded rehabilitation programs are playing a part in reducing the release of metal contamination.


1999 ◽  
Vol 34 (4) ◽  
pp. 445-451 ◽  
Author(s):  
Paul A. Weston ◽  
Patti L. Rattlingourd

Ovipositional preferences of Sitotroga cerealella (Olivier) were measured in the laboratory to characterize the stimuli eliciting oviposition in this widespread pest of stored grains. Substrates used for oviposition included grains presenting both physical and chemical stimuli as well as surrogates presenting only physical stimuli. Chemical factors associated with grains stimulated oviposition, but physical stimuli, primarily the presence of crevices, were of much greater importance. Moths reared for approximately 15 generations in the laboratory were less sensitive to grain factors than were moths more recently collected from the field. Experiments with surrogrates presenting a precisely defined range of crevice sizes confirmed that ovipositional response increased as crevice size narrowed. The results suggest that factors influencing habitat selection are probably very important in this insect because of indiscriminate oviposition on substrates that present appropriate physical stimuli but are entirely unsuitable for larval consumption.


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