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Biomedical subjects

J R Cain

Publications and source records attributed to J R Cain.

36 records · Page 2Linked to original sources
PubMed1982

Custom ocular prosthetics.

The rehabilitation of a patient who has suffered the psychologic trauma of an ocular loss requires a prosthesis that will provide the optimum cosmetic and functional result. Refinement in the details of custom ocular construction has produced a superior restoration delivered more readily.

Acrylic Resins↗
PubMed1980

Toxicity and bioaccumulation of cadmium in the colonial green alga Scenedesmus obliquus.

A laboratory investigation was conducted to study the extent and efficiency of cadmium bioaccumulation in Scenedesmus obliquus by subjecting this alga to varied sublethal Cd concentrations. The influence of cell population age on Cd bioaccumulation was also studied. Under the experimental conditions employed, growth was not significantly affected by Cd concentrations ranging from 0.01 ppm to 1.00 ppm. At concentrations above 1.00 ppm, however, growth was inhibited markedly. Increases in external Cd concentration caused an increase in total bioaccumulation over the entire range of concentrations, which did not significantly affect growth. Efficiency of Cd bioaccumulation was also concentration dependent, but maximum accumulation efficiency occurred in a medium with a Cd concentration lower than that medium in which maximum total bioaccumulation occurred. Age of the cell population influenced the extent of Cd bioaccumulation. Rapidly growing, young cultures accumulated less Cd than older cultures approaching stationary growth phase.

Cadmium↗
PubMed1980

The effect of adrenal glands on ovulation in Japanese quail (Coturnix coturnix japonica).

Adrenal involvement in ovulation has been demonstrated for several mammalian species and has recently come under scrutiny in birds. Complete adrenalectomy causes severe system imbalances; therefore, it was decided to evaluate the effect of unilateral adrenalectomy on ovulation in coturnix. Since no mortality occurred among 59 hens recovering from anesthesia following hemiadrenalectomy, systemic imbalances appeared to be tolerable. Hen-day egg production of adrenalectomized hens was significantly (P greater than .05) lower than that of sham operated and unoperated controls. Adrenalectomized birds exhibited their lowest rate of lay (18.7%) on the second day following treatment. The amount of time that hemiadrenalectomy preceded oviposition on the day of treatment influenced the occurrence of an ovulation. When adrenalectomy occurred 5 to 7.5 hr prior to oviposition, 86.7% of the birds failed to ovulate that day, compared with 27.8% of controls. This difference was highly significant. When adrenalectomy occurred less than 2.5 hr prior to oviposition, 92.3% of the birds ovulated on that day, but failed to ovulate on the next day. Subsequent to the period of adrenal insufficiency, hens resumed normal egg production. It was concluded that the adrenals directly influence daily ovulations in Coturnix, exerting an effect on hormonal events leading to ovulation.

Adrenal Glands↗
PubMed1976

Enterobacteriaceae in the jejunal microflora prevalence and relationship to biochemical and histological evaluations in healthy Colombian men.

When 23 healthy native Southwestern Colombian men were studied to determine the prevalence of Enterobacteriaceae in the jejunal microflora in a sample of thoroughly evaluated tropical inhabitants who were normal by physical examination, chest x-ray, and medical history, 14 of the 23 proved to be Enterobacteriaceae-positive, with counts of 10(3) to 10(9) per milliliter of jejunal aspirate. Thirteen had Escherichia coli, and the fourteenth had Klebsiella pneumoniae. Four had a second species of Enterobacteriaceae associated with E. coli: three were K. pneumoniae, and one was Proteus morganii. Laboratory studies routinely done on all subjects disclosed a total of 18 low biochemical values, 17 of which were associated with 12 of the 14 Enterobacteriaceae-positive subjects: six were low in serum cholesterol, four low in serum vitamin B12, four low in D-xylose excretion, and three low in creatinine coefficient; whereas, the Enterobacteriaceae-negative subjects had normal values for all biochemical tests except for serum vitamin B12 in one case. Nitrogen balance means were significantly different for the two groups: 3.39 g for the Enterobacteriaceae-positive subjects and 1.94 g for the Enterobacteriaceae-negative. No relationship was evident when the histology of the jejunal biopsies was compared with the microbiological or laboratory findings. When the 23 subjects were grouped into those (N = 19) with significant microbial recoveries of any type and those (N = 4) without, the data yielded no meaningful relationships.

Adolescent↗
PubMedDate not supplied

Air movement visualization in the workplace: current methods and new approaches.

Airflow visualization in the workplace to assess containment, ventilation, or general air movements is often carried out using smoke tracers. The most prevalent method uses a disposable smoke tube that generates a plume of concentrated sulfuric acid fume. However, use of the smoke tube exposes occupational hygienists to the risk of sulfuric acid exposure through inhalation or dermal contact, as well as injury from sharps. Following concern over the potential health hazard associated with smoke tube usage, alternative flow visualization methods and technologies have been reviewed. Methods of generating smoke or bubbles other than using smoke tubes suitable for visualizing air movements include heated element smoke generators, combustion generators, generation of metallic chlorides and ammonium chloride, generation of neutral density bubbles, and water fog generation. Some of these methods are applicable in specific workplace situations. However, there is no commercially available smoke or bubble generator currently available that matches the smoke tube for cost effectiveness, ease of use, and wide applicability, while also reducing the potential health risks associated with smoke tube usage. Despite this, certain technologies, in particular water/glycerol smoke generation using heated element generators, have the potential to be developed into viable alternatives to the smoke tube. Thus, with further development, an air movement visualization method that poses a significantly lower health hazard than the smoke tube is feasible.

Aerosols↗
PubMedDate not supplied

Prevalence of certain antibodies to selected disease-causing agents in wild turkeys in Texas.

In Texas in 1976 and 1977, Rio Grande turkeys (Meleagris gallopavo intermedia) from seven counties and Eastern turkeys (M. g. silvestris) from one county were tested for antibodies to selected poultry pathogens. Standardized serological tests disclosed reactors to Salmonella pullorum (2.4%), S. typhimurium (2.3%), and Mycoplasma gallisepticum (4.8%). There were no reactors to Newcastle disease virus or Chlamydia psittaci. Prevalence of M. gallisepticum antibody in wild turkeys was significantly higher for counties with commercial turkey operations than for counties lacking domestic turkeys, whereas the incidence of S. pullorum and S. typhimurium did not differ significantly.

Animal Population Groups↗
PubMedDate not supplied

Soft liner-retained, implant-supported overdenture: a technical note.

This paper describes the design and fabrication of a soft liner-retained, implant-supported overdenture used in 10 patients over a period of 1 to 6 years. A final complete denture impression is made of the dental arch, including implant abutments extending 5 mm above the gingival tissue. The master cast is fabricated with actual abutments placed in the impression. After the final wax try-in, the denture is flasked in the usual manner with the metal abutments in place. Before packing with acrylic resin, plastic tubing 1 to 2 mm thick is placed around each abutment. The denture is trial packed and allowed to bench cure over night. The plastic tubing is then removed and a soft denture lining material is placed in these areas only. The flask is closed and cured according to the manufacturer's recommendation. The denture is delivered as a conventional overdenture.

Acrylic Resins↗