Bioprocess development for biolubricant production using microbial oil derived via fermentation from confectionery industry waste

Microbial oil produced from confectionery and wheat milling side streams has been evaluated as novel feedstock for biolubricant production. Nutrient-rich fermentation media were produced by a two-step bioprocess involving crude enzyme production by solid state fermentation followed by enzymatic hydrolysis of confectionery industry waste. Among 5 yeast strains and 2 fungal strains cultivated on the crude hydrolysate, Rhodosporidium toruloides and Cryptococcus curvatus were selected for further evaluation for biolubricant production based on fermentation efficiency and fatty acid composition. The extracted microbial oils were enzymatically hydrolysed and the free fatty acids were esterified by Lipomod 34-MDP in a solvent-free system with trimethylolpropane (TMP) and neopentyl glycol (NPG). The highest conversion yields were 88% and 82.7% for NPG esters of R. toruloides and C. curvatus, respectively. This study also demonstrates that NPG esters produced from microbial oil have promising physicochemical properties for bio-based lubricant formulations that could substitute for conventional lubricants

Comparison of MPI implementations on a shared memory machine

Abstract. There are several alternative MPI implementations available to parallel application developers. LAM MPI and MPICH are the most common. System vendors also provide their own implementations of MPI. Each version of MPI has options that can be tuned to best t the characteristics of the application and platform. The parallel application developer needs to know which implementation and options are best suited to the problem and platform at hand. In this study the RTCOMM1 communication benchmark from the Real Time Parallel Benchmark Suite is used to collect performance data on several MPI implementations for a Sun Enterprise 4500. This benchmark provides the data needed to create a re ned cost model for each MPI implementation and to produce visualizations of those models. In addition, this benchmark provides best, worst, and typical message passing performance data which is of particular interest to real-time parallel programmers.

Implementation and Results of Hypothesis Testing from the C

This paper describes the implementation of the hypothesis testing benchmark, one of ten kernels from the C 3 I(Command, Control, Communications and Intelligence) Parallel Benchmark Suite (C 3 IPBS) 1. The benchmark was implemented and executed on a variety of parallel environments. This paper details the run times obtained with these implementations, and offers an analysis of the results