Hemolytic Bacteria Research Articles

Survival of Moraxella bovis in the alimentary tract of the face fly.

A hemolytic bacterium, Moraxella bovis (Hauduroy), the causative organism of infectious bovine keratoconjunctivitis, was fed in Trypticase-soy broth to 4 to 6-day-old female Musca autumnalis DeGeer. M. bovis was recovered from alimentary tracts of the flies up to 48 h, but not 72 h, after ingestion of the bacterial suspension. More bacterial isolates were obtained from crops than from midguts, and no M. bovis was found in either the hindgut or hemolymph.

Bacteriological Quality of Raw Materials Used in Finnish Mink Feed

Mink feed raw materials were analyzed for total bacterial count, the number of faecal streptococci, the coliform count, the number of haemolytic bacteria and the number of sulphite reducing bacteria. The investigation comprised samples from the following raw materials: four slaughter-house offal products, preserved and unpreserved slaughter blood, Baltic herring, cod filletting offal, fish silage, blood meal, fish meal, meat-bone meal, protein concentrate, brewer’s yeast and cereal feed. The slaughter-house offals and unpreserved slaughter blood had the poorest quality, in terms of all the bacterial types for which the samples were analyzed. There were statistically significant differences in bacterial contents between slaughter-house offals from different sources. The preserved slaughter blood had significantly lower bacterial contents as compared to the unpreserved slaughter blood. Single samples of the cod filletting offal, Baltic herring and the blood meal had relatively high total bacterial counts, but the specified mean bacterial counts were relatively low. The bacterial counts for the rest of the investigated raw materials were relatively low.

Bacteriological Quality of Ready-Mixed Mink Feed in Finland

Frozen samples of Finnish ready-mixed mink feed were analyzed for total bacterial count, the number of faecal streptococci, the coliform count, the number of haemolytic bacteria and the number of sulphite-reducing bacteria. The investigation comprised 242 feed samples from 38 central kitchens and larger private farm kitchens, the combined feed production of which is about 85 % of the yearly feed production of Finland. Of all samples 48.3 % had a total bacterial count of 106 … 6} × 106 bacteria per g of feed. The total bacterial count was relatively constant during the first four production periods of the year (December-August) and was elevated during the last period (September-November). The percentage of samples containing less than 2.5 × 104 faecal streptococci per g of feed was 49.8 %; 62 % of the samples contained less than 2.5 × 104 coliform bacteria per g. The content of coliform bacteria was lowest during the third production period (May); 48.5 % of the samples contained 5 × 103 … 105 haemolytic bacteria per g, and 4.6 % were negative. The content of haemolytic bacteria was relatively constant during the whole production year; 52.6 % of the feed samples contained 5 × 103 … 105 sulphite-reducing bacteria per g, and 17.2 % were negative. The mean content of sulphite-reducing bacteria was lowest during the second production period (March-April). The results are discussed and compared with corresponding results from Norway and Denmark.

Microbiological examination of six industrial soluble oil emulsion samples

Soluble oil emulsion samples from machine tool sumps were examined for their total bacterial population and for potentially pathogenic enteric and haemolytic bacteria. All the samples contained a large bacterial population in which the most abundant organisms belonged to the genus Pseudomonas, and also a significant number of enteric and haemolytic bacteria. Very low numbers of anaerobic sulphide producing bacteria and no fungi were isolated. The samples were generally in poor condition with free oil and slime clearly visible. In only on instance was the oil/water ratio correct.

Carbon monoxide production from heme compounds by bacteria.

Carbon monoxide formation from heme compounds by bacteria was investigated to study microbial hemoprotein catabolism with reference to heme degradation by mammalian tissues. Hemolytic and nonhemolytic bacteria were incubated aerobically and anaerobically with the following substrates: erythrocytes, hemoglobin, myoglobin, cytochrome c, hematin, iron hematoporphyrin, copper hematoporphyrin, protoporphyrin, and bilirubin. After 18 hr at 37 C the evolved CO was measured by gas chromatography. None of the bacteria formed CO anaerobically. Under aerobic conditions both alpha-hemolytic Streptococcus mitis and hemolytic Bacillus cereus formed CO from all of the heme compounds tested, whereas nonhemolytic Streptococcus mitis did not evolve CO from any of the substrates. The hemolytic bacteria did not produce CO when the iron of heme was either replaced by copper or removed, as in copper hematoporphyrin and in protoporphyrin, respectively.

Auto-reactivity to haemoglobin in the sera of cattle and sheep infected with haemolytic bacteria.

Auto-reactivity to haemoglobin in the sera of cattle and sheep infected with haemolytic bacteria.

Studies on Aerosol (Part 2)

In our previous paper on dust aerosol it was pointed out that reconsideration should be given to the present allowable level of atmospheric contamination based on a quantitative evaluation of dust.Following the investigations on dust aerosol in ordinary living environments, bacterial aerosol, especially hemolytic bacteria, was analysed as to its environmental medical significance.The results are summarized as follows:1. There were no correlations among the numbers of dust aerosol (measured with Millipore Filter), bacterial aerosol (with Millipore Filter) and fallen bacteria (by Koch's method).2. The number of hemolytic bacteria in the air was closely related to the number of persons gathered as well as to the cold-epidemic.It is known that hemolytic bacteria is related to humans as a carrier of bacteria in contrast to fallen bacteria by Koch's method. This fact suggests that hemolytic bacteria in the air may be a new useful indicator of atmospheric bacterial contamination in living environment.3. Among the strains of hemolytic bacteria, staphylococcus was observed most frequently, biological characteristics of which were tested with the coagulase reaction and deoxyribonuclease reaction which are understood as being closely related to the pathogenecity of microorganisms.4. In a cold-epidemic, coagulase-positive staphylococci were observed, but rarely in a non-cold epidemic. In contrast, deoxyribonuclease-positive staphylococci were found even in a non-cold epidemic.These results indicate that the deoxyribonuclease reaction may be valuable for determination of the pathogenecity of staphylococci in the air.

EFFECT OF SMALL DOSES OF X-RAYS ON HYPERTROPHIED TONSILS AND OTHER LYMPHOID STRUCTURES OF THE NASOPHARYNX

46 individuals with tonsils both hypertrophied and otherwise pathologically altered and some of whom had in addition adenoid masses and lymphoid deposits posterior to the pillars of the fauces, were given exposures to x-rays. In all but four cases the treatment was followed by marked atrophy of the tonsils and the other lymphoid deposits, attended by an opening and drainage of the tonsillar crypts. As this process progressed the previously enlarged tonsils assumed a smooth and normal appearance and the hemolytic bacteria-streptococci and staphylococci chiefly-which were often present in the affected tonsil disappeared usually within 4 weeks of the treatment.