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Seventeen cultures belonging to three genera of facultative bacteria ( Serratia, Cellulomonas, and Corynebacterium) were screened for the production of xylitol, a sugar alcohol used as a sweetener in the pharmaceutical and food industries. The bacterial strains that utilized D-xylose for growth were investigated for xylitol production. A chromogenic assay of both solid and liquid cultures showed that ten of the 17 bacteria screened could grow on D-xylose and produce detectable quantities of xylitol during 24-96 h of fermentation. Among the screened cultures, Corynebacterium sp. B-4247 produced the highest amount of xylitol. In addition, the ten bacterial cultures that initially produced xylitol were studied for the effect of the environmental factors, such as temperature, concentration of D-xylose and aeration, on xylitol production. 相似文献
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Balagopal P Pandey M Chandramohan K Somanathan T Kumar A 《World journal of surgical oncology》2003,1(1):4
Background
Choriocarcinoma is an aggressive neoplasm arising in the body of the uterus. The disease normally spreads to lung and brain. 相似文献6.
BACKGROUND: Primary central mucoepidermoid carcinoma of jaws is a rare lesion comprising 2-3% of all mucoepidermoid carcinomas reported in literature. CASE PRESENTATION: The case presented here illustrates the hypothesis that its specific pathogenesis is unknown. CONCLUSIONS: Mucoepidermoid carcinoma of the jaw is a rare tumour of unknown aetiology. Although about a 100 cases has been reported in literature, the speculation on its aetiopathogenesis has mainly centred on the pluripotential capabilities of the epithelial lining of odontogenic cysts. 相似文献
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Performance analysis of MPI collective operations 总被引:1,自引:0,他引:1
Jelena Pješivac-Grbović Thara Angskun George Bosilca Graham E. Fagg Edgar Gabriel Jack J. Dongarra 《Cluster computing》2007,10(2):127-143
Previous studies of application usage show that the performance of collective communications are critical for high-performance
computing. Despite active research in the field, both general and feasible solution to the optimization of collective communication
problem is still missing.
In this paper, we analyze and attempt to improve intra-cluster collective communication in the context of the widely deployed
MPI programming paradigm by extending accepted models of point-to-point communication, such as Hockney, LogP/LogGP, and PLogP,
to collective operations. We compare the predictions from models against the experimentally gathered data and using these
results, construct optimal decision function for broadcast collective. We quantitatively compare the quality of the model-based
decision functions to the experimentally-optimal one. Additionally, in this work, we also introduce a new form of an optimized
tree-based broadcast algorithm, splitted-binary.
Our results show that all of the models can provide useful insights into various aspects of the different algorithms as well
as their relative performance. Still, based on our findings, we believe that the complete reliance on models would not yield
optimal results. In addition, our experimental results have identified the gap parameter as being the most critical for accurate
modeling of both the classical point-to-point-based pipeline and our extensions to fan-out topologies.
相似文献
Jack J. DongarraEmail: |
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Characterization of Cfa1, a monofunctional acyl carrier protein involved in the biosynthesis of the phytotoxin coronatine
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Cfa1 was overproduced in Escherichia coli and Pseudomonas syringae, and the degree of 4'-phosphopantetheinylation was determined. The malonyl-coenzyme A:acyl carrier protein transacylase (FabD) of P. syringae was overproduced and shown to catalyze malonylation of Cfa1, suggesting that FabD plays a role in coronatine biosynthesis. Highly purified Cfa1 did not exhibit self-malonylation activity. 相似文献