β-PLEATED SHEETS IN OLIGOPEPTIDE CRYSTALS

Many oligopeptide crystals show the β-pleated sheet structures. Both parallel and antiparallel chain pleated sheets are found, and also both ideal (flat) and heavily twisted sheets are found. The structural parameters, such as the T (NCα-C') angles, the torsion angles (φ and ø), the fiber axis periods, the hydrogen bond lengths, and the interchain spacings, are studied. Some of them deviate signifi cantly from those proposed by Pauling & Corey (Proc. Natl. Acad. Sci. US (1953), 39, 253–256). In the heavily twisted sheets, the twists are larger than those in the globular proteins, and each two neighboring chains are almost per pendicular with each other, preserving the β-sheet type hydrogen bond system. The torsion angles in the twisted sheets are rather close to those of the poly (L-proline) II helix. It also is discussed that the (NCαC) angles sometimes deviate by almost 5° from the standard value depending on the structures of the main and side chains.     

A Preliminary Report on Autologous Bone Marrow Transplantation for the Treatment of Advanced Non-Hodgkin's Lymphoma

Four patients with advanced non-Hodgkin's lymphoma of unfavorablehistology were treated with marrow-lethal doses of cyclophosphamide(CY) and total body irradiation (TB1) followed by the infusionof cryopreserved autologous marrow. All four patients showedengraftment after autologous bone marrow transplantation andachieved complete remission (CR). Three of them, however, developedrelapse in 1.7, 12.9 and 14.5 mo respectively after the transplantation.The other patient has survived in drug-free CR for more than16.6 mo. There was no treatment-related death although therewere some tolerable complications. These data suggest that theCY-TBI regimen may be effective in inducing CR in patients withadvanced non-Hodgkin's disease but it does not contribute topreventing relapse.     

Primary Adrenocortical Carcinoma and Ganglioneuroblastoma Followed by Rhabdomyosarcoma in a Child: A Case Report

We report a case of a young child affected by triple cancerswho developed a pleomorphic rhabdomyosarcoma of the retroperitoneumfollowing prophylactic chemotherapy after surgery for doubleprimary adrenocortical carcinoma and ganglioneuroblastoma. It is suggested that genetic susceptibility and chemotherapymight be responsible for the development of rhabdomyosarcomaas the second malignant neoplasm.     

Effect of Arterial Infusion of Bleomycin on Esophageal Carcinoma -- An Evaluation by Nuclear Cytophotometry --

In order to determine the histological changes after a singleinfusion of bleomycin (BLM) into the aortic esophageal artery(BLM A.I.), resected specimens from 58 patients with esophagealcarcinoma (27 cases with BLM A.I., 14 untreated cases, 13 caseswith radiation therapy and four cases with combined therapyof radiation and BLM) were examined and evaluated by Feulgenmicrospectrometry for nuclear deoxyribonucleic acid (DNA) content.The histological changes following the BLM A.I. were characterizedby degeneration and necrosis at the front of the invading carcinomatissue accompanied by inflammatory cell infiltration with foreignbody giant cells and fibrosis. In comparison with untreatedcases, BLM-treated cases showed an increase in nuclear DNA contentand a wide dispersion of the DNA values especially at the perinecroticarea and at the front of advancing carcinoma nests. Therefore,a histological effect of the BLM A.I. was shown by the measurementof the nuclear DNA content of carcinoma cells.     

Dynamic Changes of 12-Lead Electrocardiograms in a Patient with Brugada Syndrome

Dynamic ECG Changes in Brugada Syndrome. We present a patient with Brugada syndrome in whom 12-lead ECXis were recorded just before and after an episode of ventricular fibrillation (VF). A progressive elevation of both the RS-T segment and J waves just preceding and following the VF, and a close relationship between the amplitude of the RS-T segment and the preceding R-R intervals during atrial fibrillation, were documented. These findings support the hypothesis that RS-T elevation and a subsequent VF are related to a transient outward current-mediated spike-and-dome morphology of the epicardial action potential.     

Case Report: Primary splenic non-Hodgkin's B cell lymphoma in a patient with chronic hepatitis C

A case of primary splenic lymphoma in a patient with chronic hepatitis C is reported. A 69-year-old man with chronic hepatitis C was admitted to Fukuoka City Hospital for evaluation of an enlarging splenic tumour. In the spleen, ultrasonographic examination revealed a hypoechoic tumour and computed tomography demonstrated a non-enhancing low density area measuring 7 cm in diameter; coeliac angiography revealed a hypovascular tumour. Gallium scintigraphy showed uptake of the radioisotope in the splenic tumour. A splenectomy was performed and the morphological and immunohistochemical findings of this tumour were compatible with those of non-Hodgin's B cell lymphoma. Recently, cases of malignant B cell lymphoma associated with hepatitis C virus infection have been reported. Lymphotropism of hepatitis C virus may play a pathological role in the development of non-Hodgkin's lymphoma. We emphasize the importance of considering lymphoma in the differential diagnosis of extrahepatic disorders during the course of chronic hepatitis C virus infections.     

EFFECT OF THE ACUTE ADMINISTRATION OF SODIUM BICARBONATE ON RESPIRATION IN THE PRESENCE OF HYPEROXIA

The effects, on respiration, of the acute administration ofsodium bicarbonate were studied in 10 normal subjects.Carbondioxide response curves and tidal volume v. PCO2 relationshipswere obtained under hyperoxic conditions using a closed-circuitbreathing system.During alkalosis, a decrease in the slope,and a displacement of the response curves to the right, wereobserved.These findings indicate that metabolic alkalosis, inducedacutely by the administration of sodium bi-carbonate, altersthe respiratory response to carbon dioxide and that sodium bicarbonatemay have a depressant effect on respiration.