Biomedical subjects

S de Cabrera

Publications and source records attributed to S de Cabrera.

3 recordsLinked to original sources

PubMed1986

Biodelignification of lemon grass and citronella bagasse by white-rot fungi.

Twelve white-rot fungi were grown in solid-state culture on lemon grass (Cymbopogon citratus) and citronella (Cymbopogon winterianus) bagasse. The two lignocellulosic substrates had 11% permanganate lignin and a holocellulose fraction of 58%. After 5 to 6 weeks at 20 degrees C, nine fungi produced a solid residue from lemon grass with a higher in vitro dry matter enzyme digestibility than the original bagasse; seven did the same for citronella. The best fungus for both substrates was Bondarzewia berkeleyi; it increased the in vitro dry matter enzyme digestibility to 22 and 24% for lemon grass and citronella, respectively. The increases were correlated with weight loss and lignin loss. All fungi decreased lignin contents: 36% of the original value for lemon grass and 28% for citronella. Practically all fungi showed a preference for hemicellulose over cellulose.

Journal Article↗

PubMed1980

Ethanol from Sugar Cane: Flask Experiments Using the EX-FERM Technique.

Alcohol production at the laboratory scale from sugar cane pieces by the EX-FERM technique was studied with 37 strains of Saccharomyces spp. The EX-FERM process is novel in that it employs the simultaneous extraction and fermentation of the sucrose in a cane-water suspension. Two types of cane treatments were used: chips and shredded pith, either fresh or dried. A mother culture of the yeast was prepared in enriched cane juice and then added to the cane-water mixture. After static fermentation for 40 h at 30 degrees C, the cane was removed, and fresh cane was added to the yeast-alcohol broth. After an additional 24 h, the cane was again removed and the liquor was analyzed. After the first 40-h cycle, sugar consumption was above 99% with 10 of the 37 yeast strains tested, and ethanol reached levels of 1.29 to 4.00 g per 100 ml, depending on the yeast strain. The final ethanol concentration reached 4.27 to 5.37 g per 100 ml, and sugar consumption was above 98% in three cases during a second EX-FERM cycle employing previously air-dried chips and pith. Product yields were within accepted values. Cane treatment did not appear to affect the results at this level.

Journal Article↗

PubMed1978

[Microbiologic quality of fish on sale in the City of Guatermala].

A sanitary microbiological survey of fresh and processed fish on sale in Guatemalan markets and supermarkets was carried out. Samples of tables, floor and freezer surfaces, and of the water, ice and liquid drippings of the different stands were also taken and analyzed. Aerobic counts exceeded 10(6)/g in 72% of the samples, and 16% had more than 40 fecal coliforms/g. Coagulase-positive Staphylococcus aureus were never higher than 100/g in fish. The bacterial counts were higher in the ice and liquid drippings.

Animals↗