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R Baffi

Publications and source records attributed to R Baffi.

7 recordsLinked to original sources
PubMed1983

Structure-activity relationships in the dodecapeptide alpha factor of Saccharomyces cerevisiae.

Ten analogues of His-Trp-Leu-Gln-Leu-Lys-Pro-Gly-Gln-Pro-Met-Tyr, the dodecapeptide alpha factor of Saccharomyces cerevisiae, were synthesized by conventional solution phase techniques and purified by using high-performance liquid chromatography. The dodecapeptide was also synthesized attached at its carboxyl terminus to poly(ethylene oxide), a macromolecular protecting group. Analogues in which Lys6 or His1 was modified exhibited high biological activity as evidenced by their ability to elicit aberrant morphologies in a cells of S. cerevisiae. These results suggest that neither a free alpha-amine nor a protonatable side chain at position 6 is necessary for biological activity of the dodecapeptide alpha factor. Although Ala2- and Phe2-dodecapeptides were not biologically active, they competed with the natural alpha factor and several active analogues. Thus binding of the alpha factor is not sufficient to elicit a biological response; it appears that the side chain in position 2 is critical for triggering morphological alterations in a cells.

Chromatography, High Pressure Liquid↗
PubMed1981

Bilateral radical neck dissection.

From January 1960 to December 1977, 61 patients had a simultaneous one-stage bilateral neck dissection with or without excision of the primary lesion, while 63 patients had a therapeutic second (two stage) neck dissection performed by our service. In ten patients, one or both of the internal jugular veins and spinal accessory nerve were preserved. Patients in both groups were staged, using the American Joint Commission 1977 clinical classification. All the pathologic specimens had lymph node clearance done. Simultaneous bilateral neck dissection, in the present study, has an operative mortality of 10%, with 11% life-threatening complications and with 62% significant postoperative facial swelling. There is an overall three- and five-year survival rate of 20% and 12.5%. Patients who had bilateral staged neck dissection had complications seen in 54%, with a 3.2% mortality rate. The overall three- and five-year survival in this group of patients was 60% and 38%, respectively.

Aged↗
PubMed1979

Problems in resection of chest wall sarcomas.

To illustrate the problems of reconstruction in major chest wall resection, five patients with a variety of soft tissue tumors of the chest wall, located at different sites, are presented. Patients, who underwent a lateral or posterolateral chest wall resection required removal of two to five ribs sequentially as well as the adjacent soft tissue. Those who underwent an anterior chest wall resection required resection of the manubrium or the body of sternum as well as of adjacent costal cartilages. To prevent instability of the chest, herniation, and to minimize flailing, the chest defect was bridged with the use of Marlex mesh. Whenever possible, the omentum was brought into the chest cavity to increase the vascularity of the reconstruction. Since, in most instances, the tumors involved the skin because of previous damage from radiation therapy, extensive skin coverage was planned well in advance of resection. Pedicle skin flaps or rotation flaps were used to cover the skin defect. Ventilatory support by volume respirator, was required for three to four days. In all patients, the chest wall was completeley stable after three to six weeks.

Adolescent↗
PubMedDate not supplied

Nonsimultaneous bilateral radical neck dissection.

From January 1963 to December 1977, 63 patients underwent a therapeutic second (staged) neck dissection at our institute. The mean interval between the first neck dissection and the second neck dissection was 13.2 months; 58.7% of the second neck dissections were performed between 6 and 12 months after the first. Forty-six patients had histologically positive and 17 patients had histologically negative nodes in the first neck clearance; 57 patients had histologically positive and 6 patients had histologically negative nodes in the second neck clearance. Forty-two of the 63 patients had bilateral nodal disease, while 2 patients had no disease in either side of the neck. Fifty-four percent of the patients had postoperative complications; 30% developed immediate postoperative edema, and 14% had wound infection. The overall three-year and five-year survival rates were 60% and 38%, respectively. Patients who had bilateral histologically positive nodes had a 16% five-year survival rate, while those who had histologically positive nodes in one side of the neck only had a 26% five-year survival rate.

Adult↗
PubMedDate not supplied

A total organic carbon analysis method for validating cleaning between products in biopharmaceutical manufacturing.

The validation of cleaning procedures for biopharmaceutical products produced by recombinant DNA (rDNA) technology presents a diverse analytical challenge. This is because of the need for quantitation of a broad range of potential residual cellular components, including proteins, carbohydrates, and nucleic acids, as well as trace levels of detergents at various manufacturing stages. The validation of a Total Organic Carbon (TOC) analysis method for use in cleaning validation studies is presented. The method has a limit of detection of approximately 0.1 ppm, with a limit of quantitation of 0.5 ppm. TOC analysis has an accuracy of 50 to 70% or better in the 0.5- to 10-ppm range and demonstrates an overall variability of approximately 5%. The method is broadly applicable to a variety of impurities and contaminants that are likely to be encountered following the manufacture of rDNA products.

Asepsis↗
PubMedDate not supplied

Chemoimmunotherapy (DTIC and Corynebacterium parvum) as adjuvant treatment in malignant melanoma.

Sixty-one patients with stage I or II (lymph node involvement) malignant melanoma were prospectively randomized into a control group receiving surgical treatment only (consisting of wide excision of primary and regional node dissection) and a group receiving the same surgical treatment plus adjuvant therapy with DTIC and Corynebacterium parvum. Followup times ranged from 1 1/2 to 4 years. Among the 29 patients in the surgical control group, there were five hematogenous recurrences and one regional recurrence and four patients have died. Among the 32 patients in the treatment group, there were 13 hematogenous recurrences and two regional recurrences and ten patients have died. However, the control group had six patients with involved lymph nodes while the treatment group had 15 patients in this category. It appears that although the combination of DTIC and C. parvum was well-tolerated, it did not reduce the recurrence and mortality rates.

Adolescent↗