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J T Vaughan

Publications and source records attributed to J T Vaughan.

8 recordsLinked to original sources
PubMed1991

Fast short-tau inversion-recovery MR imaging.

To enhance the versatility of the short-tau inversion-recovery (STIR) sequences, the authors determined a range of repetition time (TR) and inversion time (TI) combinations that suppress signal intensity from fat by study of both patient and phantom images. To make fast STIR images, variations in the following pulsing conditions were studied with use of an interactive computer program: decreasing the TR, limiting the number of excitations, and limiting the number of phase-encoding steps. The authors found that (a) STIR imaging need not be time consuming, (b) fat suppression can be accomplished at shorter TR by using shorter TI, and (c) short-TR fast STIR imaging is sensitive to enhancement with gadopentetate dimeglumine.

Humans↗
PubMed1991

Effects of the fungal endophyte Acremonium coenophialum in fescue on pregnant mares and foal viability.

Effects of the endophyte Acremonium coenophialum in tall fescue on pregnant mares and foal viability were evaluated. Twenty-two mature pregnant mares were randomly chosen to graze either Kentucky-31 tall fescue that was free from A coenophialum (endophyte-free, EF) or tall fescue infected with A coenophialum (endophyte-present, EP) after the first 90 days of pregnancy through parturition. Concentrations of pyrrolizidine and ergopeptine alkaloids were significantly greater in EP grass, compared with EF pasture. Ten of 11 mares grazing EP pasture had obvious dystocia. Mean duration of gestation was significantly greater for the EP group, compared with the EF group. Foal survivability was severely reduced among mares grazing EP fescue with only 1 foal surviving the natal period. Udder development and lactation were low in mares grazing EP grass. The absence of clinical problems in mares grazing EF grass implicated the endophyte as the causative agent of reproductive problems and perinatal foal mortality in pregnant mares grazing endophyte-infected fescue grass. Caution should be exercised in allowing pregnant mares to graze pastures infected with the endophyte A coenophialum.

Acremonium↗
PubMed1990

Multinuclear NMR investigations of probe construction materials at 4.7 T.

Since background signal from NMR probes can overwhelm the signal from a sample, the NMR analysis of plastics or machinable ceramics is a prerequisite to their use in probe implementations. The contributions from a variety of materials to proton, fluorine, and carbon NMR spectra are presented.

Electricity↗
PubMed1979

Equine melanoma.

Explore the source record for details and available documents.

Animals↗
PubMed1976

Condylomata acuminata.

A 5-year-old Thoroughbred chestnut mare was presented because of multiple lesions noticed for approximately one year over the vulva and ther perianal areas. Clinically, there were moist warts that stood out because of their whitish color which contrasted strikingly with the surrounding, normally pigmented, uninvolved skin (Fig. 1). Repeated topical applications of 20% podophyllin in 95% ethyl alcohol produced rapid involution. Histopathologically, marked acanthosis, numerous mitoses, prominently vacuolated epidermal cells and a chronic dermal inflammatory infiltrate were seen (Figs. 2, 3, and 4). Interestingly, melanin in the basal cell layer was not visible in the lesions, but was very apparent in the normal epidermis at the edges of the lesions. Thus the contrast between the affected and the non-affected skin was also strikingly microscopically (Fig. 2 arrows).

Animals↗