Wednesday, March 01, 2006

Tiny Animals Aid Salmonella

Salmonella, one of the planet's most problematic food-poisoning bacteria, may have an accidental ally: transparent, nearly invisible animals called protozoa. Agricultural Research Service microbiologist Maria T. Brandl has provided new evidence of the mostly mysterious interaction between these microscopic protozoa and Salmonella.

Brandl's discoveries from her work at the agency's Western Regional Research Center in Albany, Calif., may lead to new, more powerful, and more environmentally friendly ways to reduce the incidence of Salmonella in meat, poultry and fresh produce.

During their lives, Salmonella bacteria may encounter a commonplace, water-loving protozoan known as a Tetrahymena. Brandl's laboratory tests showed that the protozoan, after gulping down a species of Salmonella known as S. enterica, apparently can't digest and destroy it.

So, the Tetrahymena expels the Salmonella, encased in miniature pouches called "food vacuoles."The encounter may enhance Salmonella's later survival.

Brandl found that twice as many Salmonella cells stayed alive in water if they were encased in expelled vacuoles than if they were not encased.

What's more, Brandl found that the encased Salmonella cells were three times more likely than unenclosed cells to survive exposure to a 10-minute bath of two parts per million of calcium hypochlorite, the bleachlike compound often used to sanitize food and food-processing equipment.

The research is the first to show that Tetrahymena expel living S. enterica bacteria encased in food vacuoles and that the still-encased, expelled bacteria can better resist sanitizing.

Brandl and colleagues Sharon G. Berk of Tennessee Technological University-Cookeville and Benjamin M. Rosenthal at ARS\' Henry A. Wallace Beltsville (Md.) Agricultural Research Center documented their findings in a 2005 issue of Applied and Environmental Microbiology.

Brandl now wants to pinpoint genes that Salmonella bacteria turn on while inside the vacuoles. Those genes may be the ones that it activates when invading humans.

The research is the first to show that Tetrahymena expel living S. enterica bacteria encased in food vacuoles and that the still-encased, expelled bacteria can better resist sanitizing.


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AGRI-INFO/MARCH 1, 2006



TITLE: TINY ANIMALS AID SALMONELLA


ALAM BA NINYO NA NAKAKITA NG KAKAMPI ANG MAPAMINSALANG SALMONELLA – ITINUTURING NA PINAKA-PROBLEMA NG MGA EKSPERTO KUNG FOOD POISONING BACTERIA ANG PAG-UUSAPAN?

ANG KAKAMPING ITO NG SALMONELLA AY ANG TINATAWAG NA “PROTOZOA”, ANG TRANSPARENT AT HALOS INVISIBLE AT MALILIIT NA ANIMAL SA BALAT NG MUNDONG ITO.

NAKAKITA NG MGA BAGONG EBIDENSIYA ANG MGA EKSPERTO SA PANGUNGUNA NI MICROBIOLOGIST MARIA BRANDL TUNGKOL SA INTERACTION NG MICROSCOPIC PROTOZOA AT NG SALMONELLA.

ANG BAGONG TUKLAS NA ITO NI BRANDL, AY MAITUTURING NA BAGONG LEAD PARA SA MAS BAGO, MAS MAKAPANGYARIHAN AT MAS ENVIRONMENT FRIENDLY NA PAMAMARAAN PARA MAIBSAN KUNDI MAN TULUYANG MASUGPO ANG MGA INSIDENTE NG SALMONELLA CONTAMINATION SA KARNE NG HAYOP, SA MGA MANOK AT IBA PANG SARIWANG PRODUKTO.

PARTIKULAR NA TINUKOY SA PANANALIKSIK NG MGA EKSPERTO ANG ISANG URI NG PROTOZOA NA KAKAMPI NG SALMONELLA, AY ANG TETRAHYMENA.

NAGAGAWANG I-EXPEL NG TETRAHYMENA ANG SALMONELLA, NA NAKALAGAY SA ISANG MINIATURE POUCHES NA TINAGURIANG “FOOD VACUOLES” NA SIYANG DAHILAN KUNG BAKIT TUMATAGAL ANG BACTERIA CELLS SA TUBIG.

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