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Biomedical subjects

E Bock

Publications and source records attributed to E Bock.

302 records · Page 17Linked to original sources
PubMedDate not supplied

[Radiological findings in traumatic lesions of the achilles tendon (author's transl)].

Xeroradiography fits particularly well in the study of the soft tissues and given better results than traditional radiographs. Traumatic pathology of the Achille's tendon has been studied. Usually the lateral projection both of the affected and the unaffected sides is enough. In some cases xeroradiographs are made with the foot both in hyperflexion and in hyperextension. Cases with partial or complete fracture of the Achille's tendon are described as well as cases with nodular tendinitis or tendinosis, as a sequela of traumatic lesions of the tendon. Finally the findings of the surgical reconstruction of the tendon are discribed.

Achilles Tendon↗
PubMedDate not supplied

Anaerobic ammonia oxidation with nitrogen dioxide by Nitrosomonas eutropha.

Nitrosomonas eutropha, an obligately lithoautotrophic bacterium, was able to nitrify and denitrify simultaneously under anoxic conditions when gaseous nitrogen dioxide (NO2) was supplemented to the atmosphere. In the presence of gaseous NO2, ammonia was oxidized, nitrite and nitric oxide (NO) were formed, and hydroxylamine occurred as an intermediate. Between 40 and 60% of the produced nitrite was denitrified to dinitrogen (N2). Nitrous oxide (N2O) was shown to be an intermediate of denitrification. Under an N2 atmosphere supplemented with 25 ppm NO2 and 300 ppm CO2, the amount of cell protein increased by 0.87 mg protein per mmol ammonia oxidized, and the cell number of N. eutropha increased by 5.8 x 10(9) cells per mmol ammonia oxidized. In addition, the ATP and NADH content increased by 4.3 micromol ATP (g protein)-1 and 6.3 micromol NADH (g protein)-1 and was about the same in both anaerobically and aerobically grown cells. Without NO2, the ATP content decreased by 0.7 micromol (g protein)-1, and the NADH content decreased by 1.2 micromol (g protein)-1. NO was shown to inhibit anaerobic ammonia oxidation.

Adenosine Triphosphate↗
PubMedDate not supplied

Leiomyoma of the esophagus. (A case report).

Leiomyoma is the most common benign tumor of the esophagus. Its occurrence is fairly infrequent and in 50% of cases is asymptomatic. The case of esophageal leiomyoma (EL) which attracted our attention is of interest. The patient, a 44 years old women clinically assessed for cardiac rhythm disturbance with no compliant of dysphagia, had two locations of EL, demonstrated by x-ray, computed tomography and esophagoscopy. The treatment was performed in two phases, surgical and endoscopic, in relation to the non identification of the upper EL through the left thoracetomy. The various technical possibilities must all be evaluated in relation to every single case.

Adult↗
PubMedDate not supplied

[Role of diagnostic imaging of the breast in patients treated with postsurgical radiotherapy or presurgical radiotherapy or chemotherapy].

INTRODUCTION: In the last 25 years, random trials on the advantages of combined surgery and irradiation/chemotherapy of breast cancer demonstrated similar survival rates to those of massive surgery. However, both irradiation and chemotherapy have advanced and now yield good local control of the disease, so that even large breast cancers can be made operable. Breast cancer follow-up is carried out with imaging and clinical examinations to detect early locoregional recurrences, contralateral lesions and distant recurrences: to this purpose, we carried out a comparative study of all imaging modalities. MATERIAL AND METHODS: We retrospectively reviewed the data of 42 breast cancer (T2-T3 N0-N+) patients of the Senology Center of the Catholic University (Rome, Italy) treated with irradiation and/or chemotherapy for tumor debulking to permit conservative surgery. We investigated the sensitivity and the indications of mammography, B-mode and color Doppler US and MRI in measuring the exact tumor size and detecting locoregional metastatic nodes. RESULTS: After 3 years' treatment, our recurrence rate (19%) is a little higher than those in the major international trials (4.2-9% and 5 tears). The recurrence was on the surgical scar in 75% of cases (6/8), while multifocal tumors were found in 25% of cases. US was the most accurate method in measuring tumor size in 90% of cases (18/20), while mammography frequently overstaged the lesion and yielded exact measurements in 65% of cases (13/20). MRI was as accurate as US, but this technique is too expensive and little available in Italy. US accurately diagnosed lymph node recurrences (70% sensitivity), but MR rate was even higher (80%), while mammography and color Doppler US had only 5-10%. As for treatment outcome, an irregular and blurred nodule or multifocal lesions at mammography indicate poor/no response, while a much smaller radial scar than at previous similar follow-ups indicates treatment success. CONCLUSIONS: When correctly integrated, mammographic, US and MR patterns permit exact tumor size measurement and show possible locoregional lymph node involvement in the patients submitted to conservative surgery and irradiation/chemotherapy. In contrast, color Doppler findings remain poorly specific in this disease, with about 55% sensitivity. Therefore, radiologic studies, with clinical and laboratory data, have a major prognostic value in assessing the biological response to combined treatment.

Breast Neoplasms↗
PubMedDate not supplied

[Clinico-radiologic problems in the study of the male breast in gynecomastia].

INTRODUCTION: Gynecomasty is usually classified as normal of abnormal, except for 25% of cases which are classified as idiopathic because their causes and pathogenesis remain unknown. Gynecomasty is diagnosed mainly on clinical grounds, while integrated imaging, sometimes combined with cytology, is used to distinguish benign from malignant forms. Bilateral gynecomasty is easy to diagnose, especially when patients report assuming particular drugs or present other risk factors, but unilateral or asymmetrical gynecomasty is a diagnostic problem. Primary male breast cancer usually presents as a unilateral hard mass, often infiltrating the dermis and with early lymph node metastases; it is associated with gynecomasty in 20% of cases. MATERIAL AND METHODS: We examined 76 men (age range, 15-75 years) referred for breast enlargement; the patients with radiologic findings of breast adiposis were not included in our series. All patients were submitted to standard projection mammography with a high resolution dedicated film and to real time US with high frequency probes (7.5-12 MHz). RESULTS: Breast enlargement was unilateral in 48% of cases and bilateral in 52%. The radiologic patterns, compared with histologic or clinical-therapeutic follow-up, permitted the correct diagnosis in 72 of 76 patients (94%). The extant four patients had chronic inflammation (3 cases) and a malignant tumor with questionable imaging features. Overall imaging findings were: 55 cases (72%) of actual gynecomasty--unilateral in 17 and bilateral in 38 cases--9 unilateral malignant tumors (12%), eleven cases of inflammation (14%) and 1 case (2%) of unilateral metastasis from plasmocytoma. Sixteen (29%) actual gynecomasty patients (21% of the whole series) had a nodular form (unilateral in 6 and bilateral in 10 cases), 23 (42% and 30% of the whole series) had a dendritic form (unilateral in 7 and bilateral in 16 cases) and 16 (29%, 21% of the whole series) had a glandular form. CONCLUSIONS: Diagnosing gynecomasty is relatively easy in the patients with bilateral forms with a positive history of associated exogenous or endogenous factors, while focal unilateral or asymmetrical forms are difficult to distinguish into benign and malignant. The radiologic pattern may be questionable especially in chronic inflammation and in some malignant forms and must therefore be integrated with cytologic or surgical findings.

Adolescent↗
PubMedDate not supplied

[Absorption of nitric oxide by a strain of Bacillus stearothermophilus and its use in a bioreactor for purifying air].

A new Bacillus stearothermophilus strain, INMI 50, was isolated and identified. Cells of this strain immobilized on a ceramic carrier demonstrated a high NO uptake in a bioreactor. The bioreactor volume was 4 l; air flow, 100 l/h; initial NO concentration, 5 ppm; and temperature, 60 degrees C. Glycerol or 1,2-propanediol was used as carbon and energy source. The uptake of NO was 60-90% of the initial concentration over six months of continuous operation of the bioreactor. The developed procedure can be used for removal of nitrogen oxide from products of combustion of diesel fuel or from air in production areas.

Air Pollutants↗