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Theoretical studies on the pKa values of perfluoroalkyl carboxylic acids: Non-helical conformation acidity constants for n-perfluorooctanoic acid (n-PFOA)
A molecular mechanics force field method (MMFF94) systematic rotor conformational search was conducted on the well known environmental contaminant n-perfluorooctanoic acid (n-PFOA). The MMFF94 con…
Received 08 October 2009 03:17 UTC; Posted 08 October 2009
Posted to: Chemistry, Earth & Environment
Theoretical studies on the pKa values of perfluoroalkyl carboxylic acids: Chain helicity
Semiempirical, ab initio, and density functional theory (DFT) studies were conducted on a homologous series of straight chain perfluoroalkyl carboxylic acids (PFCAs) ranging in chain length from C~...
Received 06 October 2009 04:37 UTC; Posted 06 October 2009
Posted to: Chemistry, Earth & Environment
Precipitation in Aberdeen, SD: data analysis approach
Daily, monthly, and annual sums of precipitation for Aberdeen, South Dakota, from 1890-2008 were analyzed using univariate and multivariate statistical methods (primary statistical analysis, factor…
Received 05 October 2009 19:23 UTC; Posted 07 October 2009
Posted to: Earth & Environment
Host factors affecting abomasal parasites in Alpine Ibex
Alpine ibex is characterized by strong sexual differences, both morphological and in population dynamics. Host sex has been shown to strongly affect parasite load with males usually more infected t…
Received 25 September 2009 11:37 UTC; Posted 25 September 2009
Posted to: Ecology, Microbiology, Earth & Environment
Geometric Representations of Language Taxonomies
Complex relationships between different languages in a language family encoded in the lexicostatistic data can be subjected to a component analysis and represented geometrically, in terms of distan…
Received 20 September 2009 09:35 UTC; Posted 21 September 2009
Posted to: Earth & Environment
Eutrophication: Can nanophosphorous control this menace?
Eutrophication is a threat to quality of surface and ground water bodies (SWB) and to bio-diversity of the aquatic eco-system. One of the causes of P accumulation in SWB is its excess application a…
Received 15 September 2009 05:18 UTC; Posted 16 September 2009
Posted to: Chemistry, Ecology, Earth & Environment
Frequency-dependent selection predicts patterns of radiations and biodiversity
Most empirical studies support a decline in speciation rates through time, although evidence for constant speciation rates also exists. Declining rates have been explained by invoking niche-filling…
Received 12 September 2009 05:41 UTC; Posted 14 September 2009
Posted to: Ecology, Genetics & Genomics, Bioinformatics, Earth & Environment, Evolutionary Biology
CO2 Enhancement of Forest Productivity Constrained by Limited Nitrogen Availability
Stimulation of terrestrial productivity by rising CO2 concentration is projected to reduce the airborne fraction of anthropogenic CO2 emissions; coupled climate-carbon (C) cycle models, includi…
Received 11 September 2009 15:42 UTC; Posted 14 September 2009
Posted to: Earth & Environment, Plant Biology
Modeling the hydrolysis of perfluorinated compounds containing carboxylic and phosphoric acid ester functions, alkyl iodides, and sulfonamide groups
Temperature dependent rate constants were estimated for the acid- and base-catalyzed and neutral hydrolysis reactions of perfluorinated telomer acrylates (FTAcrs) and phosphate esters (FTPEs), and …
Received 08 September 2009 02:37 UTC; Posted 08 September 2009
Posted to: Chemistry, Earth & Environment
Global warming is reducing thermal stability and mitigating the effects of eutrophication in Lake Victoria (East Africa)
The impacts of global warming have been reported from several deep lakes in the African Rift Valley and in each thermal gradients within the water column have increased thus strengthening already e…
Received 07 September 2009 11:42 UTC; Posted 08 September 2009
Posted to: Earth & Environment
