Biodegradation kinetics of naphthalene, phenanthrene and pyrene were studied in sole-substrate systems, and in binary and ternary mixtures to examine substrate interactions. The experiments were conducted in aerobic batch aqueous systems inoculated with a mixed culture that had been isolated from soils contaminated with polycyclic aromatic hydrocarbons (PAHs). Monod kinetic parameters and yield...

The present investigation describes the production of acid proteases by Penicillium griseoroseum IH-02 using solid-state fermentation technique. The enzyme biosynthesis was maximum (8.2 U/ml) when fermentation was carried out on a substrate containing soybean meal and wheat bran mixed at a ratio of 3:1 and moistened with D4 diluent. The substrate to diluent ratio was found to be optimum at 1:2....

In a mixed analogue/digital system, the statechanges of digital circuits generate switching noise that is transferred through the substrate and the power-lines to sensitive analogue nodes. This work investigates how trade-offs with speed and power consumption can be used to decrease this substrate noise. Six different digital CMOS design techniques have been simulated and compared with respect ...

1 Review of competition for a single substrate Paul Waltman’s chemostat-related work has had a large impact in population biology, ecology and bio-engineering. It has motivated and inspired the work of many other authors, including us. It seems appropriate to point out a major open problem which remains unresolved after more than thirty years and to touch on some other issues related to bacteri...

An increasingly urgent topic for the realization of densely packed (mixed signal) integrated circuits is prevention of cross-talk via the substrate. Due to decreasing distances between components and increasing operating frequencies, the coupling between components and/or circuit blocks becomes stronger and affects the circuit behaviour more and more. This paper proposes a Boundary Element Meth...

We describe an isotope coding strategy that enables simultaneous GC-MS analysis of multiple samples for substrate identification and quantification. The method relies on direct measurement of isotopic ethyl carbenium ions serving as mass spectral tags in a zone of minimal interference (ZMI) at m/z 31-37. Sample aldehyde and ketone mixtures were reacted with isotopic 2-aminooxyethyl propionates ...

The remediation of metal-contaminated sediment was studied using the bioleaching process with a mixed culture of sulfur-oxidizing bacteria. The effects of substrate concentration (elemental sulfur) on sediment acidification, sulfur oxidation and metal solubilization from contaminated sediment during the bioleaching process were investigated with free-cell suspensions. Sulfur concentration great...

Cartilage from chick embryos was incubated with l4Cproline and puromycin in order to prepare puromycin peptides which were substrates for the synthesis of 14C-hydroxyproline with protocollagen proline hydroxylase. Stable enzymesubstrate complexes were recovered when the substrate was mixed with the enzyme and the mixtures were examined by gel filtration. Although ascorbate, ar-ketoglutarate, an...