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Biomedical subjects

F B Thompson

Publications and source records attributed to F B Thompson.

14 recordsLinked to original sources
PubMed1995

Effect of lopping on water potential, transpiration, regrowth, (14)C-photosynthate distribution and biomass production in Alnus glutinosa.

The effects of light, moderate and heavy branch pruning or lopping treatments (resulting in removal of 28-31, 56-60 and 80-82% of the foliage, respectively, unlopped control = 0%) were studied in 3-year-old black alder (Alnus glutinosa L. Gaertn.) plants. Within 24 h of lopping, transpiration rates decreased and water potentials increased. The effects of lopping continued for 48 days. The improved water status of the lopped plants enhanced water-use efficiency during the first 30 days. Regrowth was related to a combination of enhanced net assimilation rates during the first 30 days after lopping, use of current photoassimilates and stored carbohydrates in the roots (particularly in medium and heavily lopped plants) for the production of new leaf area, and delayed leaf senescence. The lightly and moderately lopped plants developed 62 and 57% more leaf area, respectively, than the unlopped plants, but total leaf area development was slower in the heavily lopped plants. Lightly lopped plants produced total biomass equivalent to that of unlopped plants, but the moderately and heavily lopped plants produced less biomass than the unlopped plants. During the first 30 days after lopping, there was a net loss of nodule dry matter and recovery to control values did not occur during the period of study. Immediately (24 h) after lopping, more (14)C-photosynthate was translocated to the roots of lopped plants than to the roots of unlopped plants. When a branch near the base of the main stem was fed (14)CO(2), (14)C-photosynthate translocation to the shoot increased with increasing intensity of lopping, at 50 days after lopping.

Journal Article↗
PubMed1992

Computed axial tomography on highly myopic eyes following scleral reinforcement surgery.

We performed computed tomography (CT) studies on six patients (with follow up ranging from 8 months to 18 years) following scleral reinforcement surgery, comparing the density of the observed implanted scleral material with both normal human sclera and myopic sclera. Results demonstrated the presence of a material on the posterior pole with a density greater than or equal to the experimentally determined density of ungrafted donor sclera. We conclude that CT is a useful method of evaluating both the position and long-term stability of implanted donor sclera.

Adult↗
PubMed1985

Scleral reinforcement for high myopia.

This paper reviews the scleral reinforcement procedure for high myopia. A discussion of the indications and operative technique is presented with postoperative results and complications in 191 cases performed by one surgeon over the last 14 years. A discussion of the history of scleral reinforcement, modification of technique, and pathogenesis of high myopia is presented.

Eye↗
PubMed1984

Using the argon laser to cut corneoscleral sutures.

The Coherent 900 argon blue-green laser can be used to cut pigmented corneoscleral sutures without damage to the overlying tissue. This is useful in tight corneoscleral sutures causing undue corneal astigmatism.

Aged↗
PubMed1979

Photocoagulation of malignant melanoma.

A 59-year-old woman developed a pigmented, expanding posterior pole choroidal lesion nasally that was clinically consistent with malignant melanoma. She refused enucleation, but agreed to a trial of photocoagulation therapy. Four weeks after photocoagulation, a reaccumulation of pigmentation and apparent elevation prompted a second photocoagulation treatment. During the second photocoagulation episode corneal edema occurred, and thereafter the fundus view was poor. Again, four weeks after the second treatment there appeared to be increasing pigmentation and possible elevation in the lesion centrally. Because of apparent continued growth of the tumor, the globe was enucleated 82 days after the initial photocoagulation. Serial section histopathologic examination of the lesion revealed only rare neoplastic cells along the base of the lesion. However, myriad pigment-laden macrophages were present around a central area of necrosis. Pigment accumulation within macrophages had simulated tumor growth clinically.

Choroid Neoplasms↗
PubMed1978

A simplified scleral reinforcement technique.

A simplified scleral reinforcement technique performed on 52 eyes with myopic degeneration prevented further visual loss by strengthening of the sclera over the posterior pole. This scleral homograft was useful not only in older patients with high myopia and posterior staphyloma, but also in younger patients in whom the degenerative process could be stopped at an earlier stage. In all cases in which follow-up was possible, the visual acuity remained at the preoperative level before surgery was performed or it improved.

Adolescent↗