Biomedical subjects
Publications and source records attributed to L A Peralta.
How real is the threat of bioterrorism? Experts may disagree on the likelihood of use, but the possibility cannot be totally dismissed. Complacent ignorance of a low-probability, high-cost risk is dangerous and can result in devastating global consequences. This is a US government work. There are no restrictions on its use.
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How real is the threat of bioterrorism? Experts may disagree on the likelihood of use, but the possibility cannot be totally dismissed. Complacent ignorance of a low-probability, high-cost risk is dangerous and can result in devastating global consequences.
If faced with the task of establishing an adult genitourinary outpatient clinic in an already existing ambulatory surgery setting, would you know where to begin? Careful, considered assessment is crucial to a successful outcome.
Penetrating keratoplasty can afford some patients an opportunity to regain their vision. The perioperative nurse plays a vital role in the care of these special patients. A thorough perioperative plan of care, based on an understanding of the procedure, is key to a successful corneal grafting.
Calomys musculinus, a wild cricetid rodent, is one of the main reservoirs of Junin virus. Six of these animals were infected by being placed in close contact with animals that had been experimentally infected with the virus. They were sacrificed at 10, 15 and 20 months after contact, and their salivary glands were studied by ultrastructural, immunohistochemical and virological methods. Two animals developed chronic viremia and low titers of complement-fixing antibodies. These animals were the only ones that had high viral titers in salivary glands and blood and viral antigen and particles in salivary glands. Although some of the other animals had viremia at the beginning of the experiment, it was absent 5 months later. Complement-fixing antibodies developed in all animals. On the basis of these findings, we assumed that the salivary gland is an important site of viral synthesis and excretion. This type of chronic infection, with persistent viremia and virus shedding, is possibly important for virus perpetuation in nature and transmission to man.
The precise microenvironment of Paracoccidioides brasiliensis has not yet been discovered perhaps because the methods used are not sensitive enough. We applied to this purpose the polymerase chain reaction (PCR) using three sets of specific primers corresponding to two P. brasiliensis genes. This fungus as well as several other fungi, were grown and their DNA obtained by mechanical disruption and a phenol chloroform isoamylalcohol-based purification method. The DNA served for a PCR reaction that employed specific primers from two P. brasiliensis genes that codify for antigenic proteins, namely, the 27 kDa and the 43 kDa. The lowest detection range for the 27 kDa gene was 3 pg. The amplification for both genes was positive only with DNA from P. brasiliensis; additionally, the mRNA for the 27 kDa gene was present only in P. brasiliensis, as indicated by the Northern analysis. The standardization of PCR technology permitted the amplification of P. brasiliensis DNA in artificially contaminated soils and in tissues of armadillos naturally infected with the fungus. These results indicate that PCR technology could play an important role in the search for P. brasiliensis' habitat and could also be used in other ecological studies.