Functional polymers and proteins at interfaces and surfaces are of fundamental importance for biomaterials, biocatalysis and microreactor applications. Candida antarctica lipase B immobilized on poly-DL-tryptophan tethers showed 30x higher
specific activity in aqueous and non-aqueous media than the same enzyme adsorbed or covalently bound directly to the surface. An excess...
To quantify the relative activity contributions of beta emitters in mixed emission source spectra, the triple-layer phoswich detector was modeled to generate beta energy absorption spectra from mixed beta sources. These mixed sources include four pure beta emitters (C-14, Tc-99, Sr-90, and Y-90). Monte Carlo N-Particle (MCNP) computer code was...
As part of a research program to study the transitional region of N=88
isotones, ¹⁵²Tb was produced by the reaction ¹⁵¹Eu(α,3n)¹⁵²Tb in the 88" cyclotron
located at LBNL. Gamma-ray spectroscopy of the radiation emitted from excited
¹⁵²Gd following the β⁺ decay of ¹⁵²Tb has been performed using an array of...
A novel type of model substrates, i.e. immobilized p-aminophenyl-β-D-cellooligosaccharides,
was developed and used in the study of exocellulases. The
two major cellobiohydrolases from Trichoderma reesei, CBH I and CBH II were
used as representative enzymes. p-Aminophenyl derivatives of cellobiose (PAPG₂),
cellotriose (PAPG₃), and cellotetraose (PAPG₄) were synthesized from the reaction...
The public expects and deserves
a safe food supply. This
includes food free of antibiotic
residues. Congress has empowered
the Food and Drug Administration
(FDA) to examine and
closely monitor the use of animal
drugs in dairy herds across the
nation. This regulatory agency has
the power of enforcement action.
The purpose of this research was to develop and test a radiation detector to perform beta dosimetry and spectroscopy. The detector utilizes plastic scintillator volumes to produce scintillation light in proportion to the amount of energy deposited in them, and a large-area avalanche photodiode to convert the light to electrical...
The decay scheme of Mn⁵¹ has been investigated using gamma-ray
and beta-ray scintillation spectrometers and a fast coincidence
spectrometer. A half-life value of 46.5 ± 0.2 minutes was determined
for Mn⁵¹ which decays predominantly to the ground state of
Cr⁵¹ by the emission of positons with an experimentally measured
end-point...