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Biomedical subjects

S Mansouri

Publications and source records attributed to S Mansouri.

11 recordsLinked to original sources
PubMed1998

[Epithelioid sarcoma manifesting as chronic plantar arch ulceration].

BACKGROUND: Epitheloid sarcoma is an uncommon malignant soft tissue tumor observed in the distal extremities of young men. We report a case of long standing ulceration of the sole which was found to be an epithelioid sarcoma. CASE REPORT: A 78-year-old woman had an indolent ulceration of the left sole for several months. Physical examination disclosed a well demarcated 3-cm ulcerated lesion with a red center and flat edges. Skin sections confirmed the diagnosis of epithelioid sarcoma. Cells stained positively for anti-vimentin, anti-cytokeratin and anti-epithelial membrane antigen, but not for anti-S100 protein and anti-actin antibodies. Wide local excision was performed. DISCUSSION: Epithelioid sarcoma is an uncommon malignant tumor which apparently differentiates from mesenchymatous cells. It is usually observed in the distal extremities in young males, predominantly the hands and forearms. The tumor presents a firm, flesh-colored indolent nodule. Ulceration usually develops and involves the subcutis and deeper soft tissue, particularly fascial planes, aponeuroses and tendon sheaths. Treatment is wide surgical excision with or without radiotherapy. The case reported here on the sole of the foot in a 78-year-old women is unusual. Clinicians should be aware that the initial biopsy may not be contributive and that repeated biopsies may be necessary for positive diagnosis.

Aged↗
PubMed1996

[Pyogenic granuloma of the tongue in chronic graft versus host disease].

INTRODUCTION: The development of pyogenic granuloma of the tongue is rare. We report such a case in a patient with chronic graft-versus-host disease. CASE REPORT: A 5-year-old girl was treated with allogenic bone marrow transplantation for aplastic anemia. Complications consisted in chronic graft-versus-host disease with cutaneous, mucosal and hepatic involvement. Seven months later, a voluminous pyogenic granuloma of the tongue developed on previous erosive lichenoid lesions of chronic graft-versus-host disease while the patient was under cyclosporin. Surgical resection was done. Relapse occurred and treatment was identical. DISCUSSION: Six cases of pyogenic granuloma of the oral cavity in chronic graft-versus-host disease have been reported in the literature. Pyogenic granuloma must be considered in tumoral lesion of the oral cavity of patients with chronic graft-versus-host disease. All patients had erosive lichenoid lesions and were under cyclosporin; its role in the genesis of these lesions is debated. Treatment relies on surgical resection confirming the diagnosis.

Bone Marrow Transplantation↗
PubMed1989

Bacterial ethylene synthesis from 2-oxo-4-thiobutyric acid and from methionine.

The ability of selected bacterial cultures to synthesize ethylene during growth in nutrient broth supplemented with methionine or 2-oxo-4-methylthiobutyric acid (KMBA) was examined. Although most cultures transformed KMBA into ethylene, only those of Escherichia coli SPAO and Chromobacterium violaceum were able to convert exogenously added methionine to ethylene. In chemically defined media, E. coli SPAO produced the highest amounts of ethylene from methionine and KMBA. This capability was affected by the nature of the carbon source and the type and amount of nitrogen source used for growth. When glutamate was used as sole source of carbon and nitrogen for growth, the activity of the ethylenogenic enzymes was reduced to 25% of that observed with cultures grown with glucose and NH4Cl. Neither methionine nor KMBA significantly affected the ethylenogenic capacity of E. coli SPAO. Menadione and paraquat, compounds that generate superoxide radicals, stimulated ethylene synthesis by harvested cells, but not by cell-free extracts of E. coli SPAO. In addition, cells of Pseudomonas aeruginosa, which produced no ethylene in culture in the presence of exogenously added KMBA, yet possessed the necessary enzymes in an active form, were able to synthesize ethylene from KMBA when incubated with menadione or paraquat.

Ammonium Chloride↗
PubMedDate not supplied

Affinity sensor: a new technique for developing implantable sensors for glucose and other metabolites.

We describe affinity sensors for monitoring various metabolites in blood plasma by optical means. The principle of detection is similar to that used in radioimmunoassays and is based on the competitive binding of a particular metabolite and a fluorescein-labeled analogue with receptor sites specific for the metabolite and the labeled ligand. This concept has been directed toward the development of an affinity sensor for glucose. Concanavalin A, a protein with specific binding character for glucose, was immobilized on the inside surface of a hollow dialysis fiber. Fluorescein-labeled dextran was selected as the competitive labeled ligand. The molecular weight cutoff of the dialysis fiber is low enough to completely retain the 70,000 MW dextran within the fiber lumen while glucose can freely pass through the dialysis membrane. The sensor is completed by inserting a single optical fiber in the lumen of the dialysis fiber, thus allowing measurement of the unbound FITC-dextran. Preliminary tests of the sensor indicated the feasibility of the approach. Sensitivity to glucose in the physiologic range was obtained, but further work will be required to optimize the sensitivity and response time of the sensor.

Blood Glucose↗