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181.
182.
The flow field and mixing behavior surrounding a rising drop were simulated using the SOLA-VOF computer code. The effects of kinematic viscosity, interracial tension, drop density and spatial location on the mixing behavior and several mixing indices were studied as a function of time. Two mixing indices, one based upon material line extension and rate variations in material line extension and the other based upon a Lagrangian correlation coefficient and a Lagrangian time scale, were shown to be directly related to the fluid mechanics causing the mixing. Another index, the scale of segregation, was found to be inadequate in describing the mixing since its scale was too large to discern small scale mixing behavior. 相似文献
183.
Hot-Water Rinsing and Trimming/Washing of Beef Carcasses to Reduce Physical and Microbiological Contamination 总被引:2,自引:0,他引:2
LYNN R. GRAVES DELMORE JOHN N. SOFOS JAMES O. REAGAN GARY C. SMITH 《Journal of food science》1997,62(2):373-376
A field study was conducted to compare trimming/washing procedures with hot-water rinsing as interventions for beef carcass decontamination. Treatments included no trimming/no washing; knife-trimming followed by spray-washing (26°C, 276 kPa followed by 1000 kPa); and hot-water rinsing (> 77°C, 138–152 kPa, 2.5 or 8 sec) following either knife-trimming or no knife-trimming of the contaminated site and spray-washing. Samples were analyzed for counts of total aerobic bacteria, total coliforms and Escherichia coli, as well as for the presence of Salmonella spp. and E. coli O157:H7. Results indicated decontamination of beef carcasses could be achieved by knife-trimming followed by spray-washing or by spray-washing followed by hot-water rinsing. 相似文献
184.
Salt (NaCl) was added to raw ground beef at levels of 0, 0.5, 1, 2 or 3% of the weight of the meat and defatted glandless cottonseed flour (GCF) was added at 0 or 3% levels. Patties were made with these mixes and stored for 3 or 6 days at 4°C or for 30 or 60 days at –20°C. Lipid oxidation (TBA values) in samples stored at 4° and –20°C and discoloration in samples stored at 4°C were determined. In samples made with salt only, TBA values within each storage period for each storage temperature increased with increasing salt levels up to 2%; increasing salt from 2 to 3% decreased TBA values. GCF markedly reduced TBA values at each salt level. Discoloration of samples stored at 4°C was also decreased by GCF. 相似文献
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186.
LARRY A. BERGMAN J. PATRICK GARY BURT EDELSEN NEIL HELM JUDITH COHEN PATRICK SHOPBELL C. ROBERTO MECHOSO CHUNG-CHUN M. FARRARA JOSEPH SPAHR 《International Journal of Satellite Communications and Networking》1996,14(3):259-266
This paper describes two high data rate experiments that are being developed for the gigabit NASA Advanced Communications Technology Satellite (ACTS). The first is a telescience experiment that remotely acquires image data at the Keck telescope from the Caltech campus. The second is a distributed global climate application that is run beween two supercomputer centers interconnected by ACTS. The implementation approach for each is described along with the expected results. Also, the ACTS high data rate (HDR) ground station is also described in detail. 相似文献
187.
The RAD14 gene of Saccharomyces cerevisiae is required for the incision step of the nucleotide excision repair process. The Rad14 protein can bind zinc, possesses a potential zinc finger DNA binding domain and has been shown to bind specifically to damaged DNA. Differences in UV sensitivity exist between a rad14 deletion strain and a putative rad14 point mutant, the point mutant being more resistant to UV than the deletion strain. Here, we confirm that the rad14 deletion strain repairs neither UV-induced cyclobutane pyrimidine dimers (CPDs) nor endonuclease III-sensitive damage sites, whereas the point mutant cannot repair the former but can repair the latter. From this it can be inferred that the point mutant produces an altered protein product allowing recognition of endonuclease III sensitive sites but not CPDs. To investigate this, the rad14 mutant allele was sequenced. It contained two GC-AT transition mutations when compared to the wild-type RAD14 gene sequence. When the rad14 point mutant sequence is translated, alterations within the putative zinc finger binding domain are observed, with one of the cysteine residues of the zinc binding motif being replaced by tyrosine. This suggests that alterations within the zinc finger binding domain of the Rad14 protein cause changes to the damage recognition properties of the protein. The use of the Rad14 protein from the point mutant should assist in experiments investigating the in vitro binding properties of the Rad14 protein to different types of DNA damage. © 1997 by John Wiley & Sons, Ltd. 相似文献