The effects of various cure cycles upon the viability ofBacillus subtilis var.niger spores within solid propellant

Details The effects of various cure cycles upon the viability ofBacillus subtilis var.niger spores within solid propellant The effects of various cure cycles upon the viability ofBacillus subtilis var.niger spores within solid propellant

Jun 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972slsci...3..198b&link_type=abstract

Space Life Sciences, Volume 3, Issue 3, pp.198-205

Physics

Scientific paper

Survivor curves forBacillus subtilis var.Niger spores were determined during cure within à solid propellant containing a saturated hydrocarbon binder. Cure temperatures of 82, 93, 105, and 115°C were selected for evaluation. Upon completion of the propellant mix, samples of approximately 5 g were weighed, placed into aluminum planchets, and subjected to dry heat cure. The results indicated that the survivor curves were polyphasic at all cure temperatures evaluated. The polyphasic nature of the survivor curves reflect the physico-chemical changes occuring during polymerization. Selected portions of each survivor curve were delineated and subjected to linear regression analysis. D values were calculated for selected portions of each survivor curve at each test temperature. Sterility (considering the nature and consistency of the propellant system under investigation, sterility has been defined as no viable particles recovered-N.V.P.R.) was not achieved with samples cured at 82 and 93°C for 7 day. Samples cured at 105°C experienced a four-log reduction in number of spores within 4 h; however, sterility was not achieved by 48-h cure. A temperature of 115°C was necessary to achieve sterility within 12 h. The results indicated that thermally stable binders will permit the sterilization of solid propellant motors during routine cure cycles, prior to terminal sterilization.

Affiliated with

Also associated with

No associations

Rating

The effects of various cure cycles upon the viability ofBacillus subtilis var.niger spores within solid propellant does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The effects of various cure cycles upon the viability ofBacillus subtilis var.niger spores within solid propellant, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The effects of various cure cycles upon the viability ofBacillus subtilis var.niger spores within solid propellant will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1004702