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Biomedical subjects

S Bini

Publications and source records attributed to S Bini.

10 recordsLinked to original sources
PubMed2003

Experimental study for the feasibility of a crystalline undulator.

We present an idea for creation of a crystalline undulator and report its first realization. One face of a silicon crystal was given periodic microscratches (grooves) by means of a diamond blade. The x-ray tests of the crystal deformation due to a given periodic pattern of surface scratches have shown that a sinusoidal-like shape is observed on both the scratched surface and the opposite (unscratched) face of the crystal; that is, a periodic sinusoidal-like deformation goes through the bulk of the crystal. This opens up the possibility for experiments with high-energy particles channeled in a crystalline undulator, a novel compact source of radiation.

Journal Article↗
PubMed1999

Intraepiphyseal resection of the proximal tibia and its impact on lower limb growth.

From 1989 through 1996, 10 children affected by high grade bone tumors of the proximal tibia underwent an intraepiphyseal intercalary resection. The residual epiphyseal bone segment measured less than 2 cm in thickness in all cases and reconstruction always was performed using the combination of a vascularized fibular autograft and a massive bone allograft. The proximal epiphyseal osteosynthesis was fixed by small fragment screws. The aim of this study was to report the growth pattern of the residual proximal tibial epiphysis and to evaluate any possible lower limb discrepancy and/or deformity after the end of skeletal maturity. At current followup six patients were available for the final evaluation. Radiographic documentation included computed tomography scan of both knees before surgery, a panoramic radiographic view and a computed tomography scan of both lower limbs after the end of skeletal growth. The length of both femurs and tibias, the size of the tibial plateau and of the opposite distal femur, and any possible deformity of femur or tibia were measured and compared with the preoperative data. No patient had a limb length discrepancy greater than 3.5 cm. In all cases the ipsilateral femur had a valgus deformity of the hip develop. In two patients this deformity was associated with an elongation of the femur, partially compensating for the shortening of the tibia. The tibial plateau close to reconstruction grew less than the contralateral one (range 2%-8%) but maintained its normal relationship with the distal femur. None of these patients reported any restriction in recreational activities. They could walk, run, and jump. Their functional result according the International Society of Limb Salvage functional grading system was satisfactory in all cases.

Bone Neoplasms↗
PubMed1996

Microflora persistence on duodenojejunal flat or normal mucosa in time after a meal in children.

A pathogenic role for high numbers of bacteria in the small intestine had been suggested previously by bacterial counts on luminal aspirates, but these investigations were flawed by the sampling device "contamination" in the mouth and the changing nature of fluent intestinal content. A procedure was developed to sterilize the Watson biopsy capsule with HCl in the upper portion of the duodenum. Bacteria were counted in the mucosal homogenate of the first (diagnostic) duodenojejunal biopsy in 80 untreated celiac children, and in 46 children with irritable bowel syndrome (IBS) in a four-cell, controlled, randomized investigation. Persistence of bacteria on the mucosa for 20 h after the last meal was investigated in 62 subjects, and for 26 h after the last meal in 64 subjects. Bacteria, mainly streptococci and staphylococci, persisted at a concentration of 10(6) per gram of mucosa 20 h after the last meal. The number of bacteria per gram of mucosa was 24 times higher in all 62 children of the 20-h fast groups than in all 64 children of the 26-h fast groups (p < 0.001). The bacteria count in celiac children was 39 times higher in the 20-h fast group than in the 26-h one. This difference was significantly higher than the 11 times difference that was found on the normal mucosa between the 20- and 26-h fast IBS groups (p < 0.001), which was still significant. The number of bacteria on duodenojejunal mucosa depends on nutrient absorption and persists longer than the intermeal interval in these subjects.

Adolescent↗
PubMed1994

Same growth and different energy intake over four years in children suffering from chronic non-specific diarrhoea.

An increase in energy intake often occurs at weaning and this may depend on the current practice of offering energy-dense foods ad libitum. In two-year-old lean infants suffering from chronic non-specific diarrhoea (CNSD), the offering of food was evaluated by caregivers at every meal on the basis of food need expressions and non-starchy vegetable acceptance, taking into account the maintenance of good temper and normal activity between meals. The purpose was to avoid diarrhoea recurrence. This form of regulation was continued in a prospective, controlled, randomized investigation to explore: (i) familial pre-determination of growth and (ii) the existence of an 'unnecessary' fraction of energy intake, i.e. a fraction which may habitually be excluded while still maintaining the same normal intermeal behaviour, intellectual and physical achievements, growth, skinfold thicknesses and blood parameters. Seven-day intake home diaries and clinical assessments were performed every 6 to 12 months. Growth records were investigated in siblings. Eighty-two of 91 experimental subjects and 32 of 41 randomized ones in the control group were followed for up to four years. The control group maintained a significantly higher (15-30%) energy intake than the experimental children, without any fattening or growth acceleration, or any improved results in inter-meal behaviour, intellectual and physical achievements or blood parameters for four years. The normal median weight was reached in the experimental and control children in the sixth year of life and in the siblings in the fourth year of life.(ABSTRACT TRUNCATED AT 250 WORDS)

Anthropometry↗
PubMed1992

Anti-tumor and immunomodulatory activity of intraperitoneal IFN-gamma in ovarian carcinoma patients with minimal residual tumor after chemotherapy.

Eight patients with epithelial ovarian carcinoma persisting after chemotherapy, selected for having a residual tumor no larger than 1 cm in diameter, were treated intra-peritoneally (i.p.) with recombinant interferon-gamma twice weekly for 3 months. Toxicity consisted of fever and malaise in all patients and a transient rise in hepatic enzyme levels in 3 patients. The cytotoxic function of peripheral blood and peritoneal tumor-associated lymphocytes (TAL) and macrophages (TAM), was studied using cell lines as targets. I.p. IFN-gamma augmented the cytotoxic activity of lymphocytes and mononuclear phagocytes: stimulation was more marked and more frequently observed with TAL and occasionally TAM than with blood effectors, suggesting preferential modulation at the site of tumor growth and IFN administration. Surgical laparotomy revealed that 1 patient had a complete response, 2 a partial response and 2 had stable disease, while 3 patients had progressive disease. In this small series of patients there was no obvious, strict correlation between immunomodulation by IFN-gamma and clinical response. These results indicate that, in contrast to its lack of activity in advanced ovarian carcinoma, IFN-gamma has definite immunomodulatory and antitumor activity in the presence of limited tumor burden.

Antineoplastic Combined Chemotherapy Protocols↗
PubMed1991

Decrease in serum IgE associated with limited restriction in energy intake to treat toddler's diarrhea.

Toddler's diarrhea may be an allergic disease and its recurrences can be avoided with education to "internal spontaneity" in feeding, i.e., by education to a limited and reproducible decrease in eating incentives at the onset of meals. Serum IgE was thus investigated in 16 experimental children in a random comparison with 16 controls, all aged 1 to 4 years, before and after seven months' dietary treatment. Compliance was measured with a seven-day written diary, while serum IgE was measured by PRIST, before and after dietary treatment. A 21% decrease in energy intake (p less than 0.05) and about five times increase in fruit and nonstarchy vegetable intake amount was seen in treated children. A decrease in serum IgE level of 13.9 +/- 43.5 U/ml was found in the "internal spontaneity" group, as opposed to an increase of 33.2 +/- 50.5 U/ml in the control one (p less than 0.01). The differences between examinations were significantly correlated to the increase in NSV acceptance in all children plotted together (r = .51, p less than 0.005). The overall NSV effect on the changes of the 2 muscle areas, 2 symptoms, and 2 percent growth, 15 nutritional, 5 immune and 3 hepatic indices was significant with MANOVA (p less than 0.01). The education to "internal spontaneity" may be a useful tool for prevention of overeating, diarrhea recurrences and IgE increase in the second/third year of life.

Appetite↗
PubMed1991

Serum lipids in celiac children.

The plasma lipid levels were investigated in 45 celiac children under 3 years of age and 49 over this age at diagnosis (untreated groups), after gluten-free diet and in comparison with irritable bowel syndrome (IBS) groups matched for size, gender, and age. Total and HDL cholesterol levels were significantly lower and triglycerides higher in celiac untreated children than in IBS control children in both age groups. HDL cholesterol significantly increased in both age groups after some months of gluten-free diet. Total and LDL cholesterol significantly increased and triglycerides decreased in the younger group of subjects after the period of gluten-free diet. These results may be useful for diagnostic purposes and to motivate a strict gluten-free diet in celiac children.

Adolescent↗
PubMedDate not supplied

Choices at weaning: main factor in ingestive behavior.

"Spontaneous," i.e., self-promoted, feeding without the promotion of offering of energy-dense food (eating incentives), was maintained for 7 months in a randomized, controlled, prospective, semiblind investigation in 88 2-year-old diarrheic children. This behavior was associated with 30% lower energy intake throughout the investigation period while normal growth and blood assessments were maintained and intestinal functions improved. The dependence of a child's energy intake on maternal administrative behavior at each meal was proposed. The energy content of each meal was thus investigated in relation to a preprandial request for food, glycemia, and acceptance of nonstarchy vegetables (NSV). A sample of 210 meals eaten by 10 children with chronic nonspecific diarrhea in the second year of life before mothers were instructed in spontaneous feeding was compared with 210 meals after 1.5 months of spontaneous feeding. Compliance, food weight, preprandial glycemia, and outdoor activities were reported by the mothers in 7-day diaries. Requests for food by the child before the meal was seen and acceptance of more than two-thirds of the prescribed amount of NSV were associated with significantly lower preprandial glycemia and lower energy intake in the investigation of all meals before and after instructions were given. Feeding children on demand and habitual NSV administration may safely educate children to avoid overeating after weaning.

Blood Glucose↗
PubMedDate not supplied

Alpha-fetoprotein in the management of germ cell tumors of the ovary.

From 1982 to 1989 positive alpha-fetoprotein (AFP) levels were detected after surgery in 3 patients with pure immature teratoma, 7 patients with mixed germ cell tumors and 16 patients with pure endodermal sinus tumor (EST) of the ovary. In the three patients with pure immature teratoma, AFP serum levels became spontaneously undetectable in one month without chemotherapy. The marker was thereafter negative, despite the persistence of tumor in 2 patients, and a relapse in the third one. The serum levels of AFP did not correlate with the stage of EST and mixed germ cell tumors. The monitoring of AFP serum levels during treatment correlated with response to chemotherapy: of the 16 patients with pure EST, 14 achieved a serological complete response and did not undergo second look surgery; two patients had a serological partial response. One of them reached a serological complete response after further chemotherapy. The other patient with liver extragonadic tumor underwent liver lobectomy with negative histology. Among 7 patients with mixed germ cell tumor, 6 achieved a serological and pathologic complete response. The 7th patient had a serological complete response, but microscopic residual tumor at second look laparotomy. The decrement curve of AFP was not predictive for recurrence. However, AFP monitoring was useful for an early diagnosis of relapse in 4 patients. AFP is a reliable marker for the diagnosis, treatment evaluation and follow-up of patients with pure EST and a useful marker in the clinical management of mixed germ cell tumors of the ovary.

Adolescent↗