Bioconversion of Vanillin into Vanillic Acid byPseudomonas fluorescens Strain BTP9 Cell Reactors and Mutants Study

Applied Biochemistry and Biotechnology - The ability of a fluorescentPseudomonas to bioconvert vanillin, a phenolic compound, into vanillic acid was investigated. Free and immobilized cell reactors...     

An asymptotic approximation for a three dimensional linear elasticity problem with Robin boundary condition in a thick cylinder

This contribution shows the asymptotic approximation of the displacements and shear stresses of a three dimensional (3D) linear elasticity boundary value problem in a thick beam with Robin boundary condition at an end. The analytic asymptotic approximation is compared to the numerical 3D Finite element solution. (© 2014 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim)     

Isotope analyses of the lake sediments in the Plitvice Lakes,Croatia

The analyses of radioactive isotopes ¹⁴C, ¹³⁷Cs and ²¹⁰Pb, and stable isotope ¹³C were performed in the sediment cores, top 40 cm, taken in 2011 from karst lakes Pro??e and Kozjak in the Plitvice Lakes National Park, central Croatia. Frozen sediment cores were cut into 1 cm thick layers and dried. ¹⁴C activity in both carbonate and organic fractions was measured using accelerator mass spectrometry technique with graphite synthesis. ¹³⁷Cs, ²¹⁰Pb, ²¹⁴Pb and ²¹⁴Bi were measured by low level gamma spectrometry method on ORTECHPGe detector with the efficiency of 32%. Distribution of ¹⁴C activity from both lakes showed increase of the ¹⁴C activity in the top 10–12 cm in both carbonate and organic fractions as a response to thermonuclear bomb-produced ¹⁴C in the atmosphere in the sixties of the 20th century. Anthropogenically produced ¹³⁷Cs was also observed in sediment profiles. Sedimentation rates for both lake sediments were estimated based on the unsupported ²¹⁰Pb activity. Different ¹⁴C activity of the carbonate fraction (63–80 pMC, percent of modern carbon) and organic fraction (82–93 pMC) is the result of geochemical and biological processes of the sediment precipitation in the lake waters. This is also confirmed by the δ ¹³ C values of both fractions. Carbon isotope composition, a ¹⁴ C and δ ¹³ C, was compared with the lake sediments from the same lakes collected in 1989 and 2003.     

Valuing forestlands with stochastic timber and carbon prices

Annals of Operations Research - We calculate expected bare land values, assuming forestry is the highest and best land use, using a real options methodology with stochastic mean-reverting timber...