Detection and incidence of specific species of spoilage bacteria on fish. II. Relative incidence of Pseudomonas putrefaciens and fluorescent pseudomonads on haddock fillets

Pseudomonas putrefaciens has been found to constitute one of the major species of spoilage bacteria on haddock fillets. The initial population of this organism on fillets of high bacterial quality is uniformly below 4% and most frequently no greater than 1%. During refrigerated storage, the organism increases at a more rapid rate than the total psychrophilic population, comprising 50 to 90% of the total population when the total count exceeds 10(6)/g of tissue. Fluorescent pseudomonads were shown to constitute a second group of predominant pseudomonads constituting up to 19.3% of the total population after 8 days of refrigerated storage. Of a total of 45 fluorescent pseudomonads isolated from haddock fillets, 14 (31.1%) were found to be potent fish spoilers. The use of a soft-agar-gelatin plating technique showed a parallel increase of proteolytic organisms with total count indicating that proteolytic organisms other than P. putrefaciens and fluorescent pseudomonads increase at a slower rate than these two groups.

Surgery for massive myocardial infarction. An experimental study of emergency infarctectomy with a preliminary report on the clinical application

Emergency myocardial infarctectomy has been studied experimentally and clinically. The clinical experience describes encouraging results in two of four consecutive patients. The criteria of patient selection are described, along with a suggestion that associated perforation of the ventricular septum, as documented in three of the patients, makes the operative procedure more difficult and the results less satisfactory.

Experimental myocardial infarction was studied in two groups of calves with a mortality rate of 100%. In the first group emergency resuscitation by massage and bypass produced an initial resuscitation rate of 14% but a survival rate of only 11%. In the second control group of fatal infarction, resuscitation was attempted by 45 minutes of bypass, with improvement in the resuscitation rate to only 23% and proportionate improvement in the survival rate to 18%.

Emergency infarctectomy dramatically increased the initial salvage rate to 100% and improved the survival rate to 41%.

Pteropod Ooze from Bermuda Pedestal

Twenty pteropod species and two subspecies are present in the Bermuda Pedestal pelagic sediments. Some species having thin, fragile shells were absent from the sediments but present in the deep water off Bermuda. The subarctic species was present only in the sediments, which indicates that the subarctic current probably invaded the Bermuda region some time ago.