PubMed Health⌕ Search

Biomedical subjects

J J Parker

Publications and source records attributed to J J Parker.

13 recordsLinked to original sources
PubMed1989

Preventive services in a hybrid capitation and fee-for-service setting.

The potential omission of indicated tests for patients enrolled in prepaid health care plans has been raised as a possibility. This study reviewed the charts of 149 adult patients seen for routine physical examinations or checkups in university-based family medicine or internal medicine clinics. Of the patients included, 67 were enrolled in a capitated plan and 82 enrolled in fee-for-service based plans. Results showed that the rates of compliance with preventive services appropriate to patients' age and sex (Papanicolaou smears, breast examination, mammography, and stool examination for occult blood) were not significantly different for capitated and fee-for-service patients.

Adult↗
PubMed1979

Diagnosis of Caroli disease by computed tomography: report of two cases.

Two patients are discussed in whom Caroli diseases was diagnosed with the aid of computed tomography (CT). One patient had the pure form of the disease, characterized primarily by saccular dilatation of the intrahepatic bile ducts and clinically manifesting as recurrent cholangitis. The second patient had a form ccharacterized primarily by hepatic fibrosis and clinically manifesting as portal hypertension. These are the first patients studied with CT to be reported to the authors' knowledge; CT is recommended as the optimal noninvasive method to evaluate such patients.

Adult↗
PubMed1966

Radiographic diagnosis of intestinal perforation in early infancy.

Records of 25 patients with intestinal perforation in early infancy who were treated at the Los Angeles County General Hospital in a period of 15 years were reviewed. Sixteen had roentgen evidence of pneumoperitoneum, and nine did not. The mortality rate was 94 per cent in the group with pneumoperitoneum, 78 per cent in the other, and 88 per cent overall. Multiple sites in the gastrointestinal tract were involved, and the causes of the lesions were diverse and frequently obscure. Prematurity, obstetrical and iatrogenic complications, and congenital anomalies were factors often associated with intestinal perforation. Roentgen features appeared to offer the best hope for diagnosis and appropriate treatment.

Female↗
PubMedDate not supplied

Quantification of Nitrosomonas oligotropha and Nitrospira spp. using competitive polymerase chain reaction in bench-scale wastewater treatment reactors operating at different solids retention times.

The effect of solids retention time (SRT) on ammonia-and nitrite-oxidizing bacteria was measured by Nitrosomonas oligotropha-like ammonia monooxygenase A and Nitrospira 16S rDNA competitive polymerase chain reaction assays in a complete-mix, bench-scale, activated-sludge system. During steady-state operation, nitrification was complete in the 20- and 10-day SRT reactors, nearly complete in the 5-day SRT reactor, and incomplete in the 2-day SRT reactor (76% ammonia oxidation and 85% nitrite oxidation). Total microbes, measured by dot-blot hybridizations, ranged from 3 x 10(11) to 3 x 10(12) cells/L, and increased with increasing SRTs. The concentration of the ammonia-oxidizer N. oligotropha dropped 100-fold from the 20-day SRT (5 x 10(9) cells/L) to the 2-day SRT (< or = 4 x 10(7) cells/L). Thus, N. oligotropha became a much smaller fraction of the total biomass in the poorly performing 2-day SRT reactor. The concentration of Nitrospira cells also decreased (10-fold) as the SRT was reduced from 20 days to 2 days. However, the number of Nitrospira cells was always greater than the number of N. oligotropha cells measured in each reactor (10- to 60-fold). While Nitrospira comprised 1 to 2% of the biomass, N. oligotropha represented only 0.04 to 0.27% of the total population. This low percentage suggests that N. oligotropha was not a dominant ammonia oxidizer in the bench-scale systems.

Ammonia↗