Biomedical subjects
J C Johnson
Publications and source records attributed to J C Johnson.
A school in a therapeutic community.
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Failure of parasitized gilt and barrow pigs on different planes of nutrition to respond alike to a superimposed infection with Strongyloides ransomi.
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An enzymic method for determination of inorganic pyrophosphate and its use as an assay for RNA polymerase.
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Effects of feeding dimethoate, its oxygen analog, and dimethoate-treated silage to cattle.
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Niagara NIA-10242 insecticide residues: their persistence in coastal bermudagrass, corn, and silages, and their effect, fed in silage, on lactating cows.
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Responses from cows fed silages containing imidan residues.
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Fate of bidrin and imidan when fed in silage to lactating dairy cows.
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Species variation and the antihistaminic properties of 3,4-dimethoxyphenethylamine.
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Residues of endosulfan in meat and milk of cattle fed treated forages.
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BORON CONTENT OF APPLES AT DIFFERENT STAGES OF DEVELOPMENT.
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Radiographic manifestations of eosinophilic gastroenteritis.
Eosinophilic gastroenteritis (EG) is a rare inflammatory disease of unknown etiology, characterized by focal or diffuse eosinophilic infiltration of the gastrointestinal tract. Although little over 250 cases of EG have been reported in the literature, EG is probably more common than reports in the literature would indicate. A retrospective review of 25 patients with EG along with a review of the literature was done to identify clinical, laboratory, radiographic, and therapeutic features. An allergic disorder was present in 14 (56%) and a peripheral eosinophilia was present in 24 (96%) of our patients. The most common radiographic manifestations of the stomach and small bowel included stenosis and fold thickening, respectively. Thirteen patients had esophageal involvement, with the esophageal stricture being the most common abnormality found in these patients. Steroids produced a good therapeutic result in most patients; the remaining patients responded to cromolyn and/or surgery.
Effectiveness of nitrous oxide in a rural EMS system.
Prehospital systems need a safe, effective analgesic agent for the treatment of patients suffering from pain. Recent studies have documented the efficacy of nitrous oxide in urban and rural settings. This study reviews the findings on 200 patients (157 trauma, 23 medical, 18 musculoskeletal problems) who received nitrous oxide during a 28-month period in a rural EMS system. Eighty-five percent of the patients reported pain relief. Only minor side effects were noted. Patient satisfaction was high, and there was no abuse noted among personnel.
Mycotoxins produced by Aspergillus fumigatus species isolated from molded silage.
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Closed reduction and lag screw fixation of sacroiliac luxations and fractures.
OBJECTIVE: To describe a technique for closed reduction and percutaneous insertion of a lag screw for fixation of sacroiliac fracture-luxations, and to report the success of this technique in stabilizing sacroiliac fracture-luxations. STUDY DESIGN: A retrospective clinical study. STUDY POPULATION: 13 consecutive client-owned dogs with sacroiliac fracture-luxations. METHODS: Sacroiliac fracture-luxations were stabilized by using a closed reduction and percutaneous lag screw fixation technique. Preoperative, postoperative, and last re-examination radiographs were used to assess the location and number of pelvic injuries, other orthopedic injuries, percent reduction of the sacroiliac joint, percent sacral width screw depth, position of the screw, pelvic canal diameter ratio, hemipelvic canal width ratio, and complications. Information on signalment, weight, weight-bearing status, neurologic status, and complications was obtained from the medical record. RESULTS: Mean percent reduction of the sacroiliac joint was 92.33%. All screws were placed within the sacral body with a mean screw depth/sacral width of 79.03%. No screw loosening occurred. Mean pelvic canal diameter ratios were 0.99, 1.20, and 1.14 preoperatively, immediately postoperatively, and at the last re-examination, respectively. Nine of 13 dogs were willing to walk on the ipsilateral rear leg the day after surgery. CONCLUSIONS: Closed reduction and percutaneous insertion of a lag screw for stabilization of fracture-luxation of the sacroiliac joint is an acceptable method of repair. CLINICAL RELEVANCE: Sacroiliac fracture-luxations can be successfully reduced and stabilized using a minimally invasive technique.
Lead exposure among workers renovating a previously deleaded bridge: comparison of trades, work tasks.
Airborne and surface lead exposures were evaluated for construction trade groups at a previously deleaded bridge renovation site in the midwestern United States. Although all lead-based paint should have been removed, old layers of leaded paint were still present on some sections of the bridge. Ironworkers performing metal torch cutting had the highest exposures (188 microg/m3), followed by workers engaged in clean-up operations and paint removal (p < 0.001). Respirators were most frequently worn by workers with the greatest lead exposures; however, laborers performing clean-up operations had exposures to lead dust of 43 microg/m3 and often wore no respiratory protection. Wipe samples revealed that almost all contractor vehicles were contaminated with lead. Heavy equipment operators with low airborne lead exposure had the highest levels of surface contamination in personal vehicles (3,600 microg/m2). Laborers cleaning structural steel with compressed air and ironworkers exposed to lead fumes from cutting had the highest concentrations of lead dust on clothing (mean 4,766 microg/m2). Handwashing facilities were provided, but were infrequently used. No separate clothes changing facility was available at the site. The potential for "take-home" contamination was high, even though this site was thought to be relatively free of lead. Construction contractors and their workers need to be aware that previous deleading of a site may not preclude exposure to significant amounts of lead.
Effect of mexiletine on spinal cord injury dysesthetic pain.
Severe pain occurs in 5-30% of the spinal cord-injured (SCI) population and is difficult to treat. Subarachnoid lidocaine has been used in selected patients with some success. Mexiletine, an analog of lidocaine that acts at Na+/K+ channels in the peripheral nerve, has been found effective in persons with diabetic dysesthetic neuropathy. The effect of mexiletine in the treatment of spinal cord dysesthetic pain was examined in this study. Fifteen patients were enrolled, and 11 patients completed the prospective, randomized, placebo-controlled, double-blind, crossover design trial. Inclusion/exclusion criteria were carefully defined. A 1-wk washout period was followed by a 4-wk drug trial of either mexiletine (450 mg/day) or placebo. This was repeated for the second medication in the second arm of the study. Patients were followed weekly with McGill and visual analog pain scales. Baseline, midpoint, and endpoint Barthel function scores were recorded. The Wilcoxon's signed-rank test and paired t test were used for statistical analysis. Results showed no significant effect of mexiletine on SCI dysesthetic pain scales or Barthel index. In conclusion, in this trial, mexiletine did not appear to decrease spinal cord injury-related dysesthetic pain.