Possible segregation caused by centrifugal titanium casting.

The possibility of the segregation under solidification process using a centrifugal casting machine was investigated using an electron probe microanalyzer with elemental distribution map, line analysis and quantitative analysis. When a very small quantity of platinum was added to local molten titanium during the casting process, macroscopic segregation was observed under conditions of density difference of 0.1 g/cm3 at the most, confirming that the centrifugal force of the casting machine is extremely strong.

Surface contamination of titanium by abrading treatment.

This study investigated the contamination of abraded Ti surfaces. Using a polishing machine, specimens were abraded with waterproof SiC grit papers under water cooling. The abraded surfaces were examined using element analysis, X-ray diffraction, and hardness tests.

[Effects of lactitol on fecal bacterial flora in patients with liver cirrhosis and hepatic encephalopathy].

Lactitol, a non-absorbable synthetic disaccharide, was administered at a dose of 36g/day for 3-4 weeks to 8 patients with liver cirrhosis and hepatic encephalopathy in order to investigate its effects on fecal bacterial flora and clinical symptoms of hepatic encephalopathy. Lactitol significantly increased occupation ratio (ratio to total bacterial number) of anaerobic Bifidobacterium (before administration 7.1% --> after 4 weeks 46.

A multicenter, randomized, controlled trial of intravenous gamma globulin therapy in children with acute Kawasaki disease.

We studied the effect of intravenous, polyethyleneglycol-treated, human immunoglobulin, administered at 200 mg/kg per day (group A: n = 147; male 86, female 61; age < 1 year, 50) or 400 mg/kg per day (group B: n = 152; male 87, female 65; age < 1 year, 52) for five consecutive days and compared it with freeze-dried, sulfonated human immunoglobulin [group C: n = 152; male 87, female 65; age < 1 year, 51), administered at 200 mg/kg per day for five consecutive days, on the prevention of coronary artery abnormalities in Kawasaki disease. Echocardiograms were interpreted blindly and independently. Proportions of 87.

Skin holes of titanium casting.

The present study describes refractories which contribute to formation of skin holes of Ti casting. Plates consisting of quartz (Qu) and cristobalite (Cr) powders and Qu- and Cr-MgO mixtures were fired at high temperatures and used as phosphate-free molds. The cross-section of the castings was investigated using an optical microscope and an electron probe microanalyzer.

Successful aggressive treatment against multiple intra-abdominal metastases from renal cell carcinoma 18 years after nephrectomy.

The management of late metastases from renal cell carcinoma is often difficult because of multiple organ involvement. We report a case of multiple metastases from renal cell carcinoma in the duodenum, pancreas, intestine, falciform ligament and liver, 18 years after nephrectomy. The patient underwent a total pancreatectomy following a gastroduodenal arterial embolization to control duodenal bleeding, a resection of the ileum and falciform ligament at a second laparotomy and repeated hepatic arterial embolizations to control the growth of liver metastases.

Involvement of calmodulin- and protein kinase C-related mechanism in an induction process of peroxisomal fatty acid oxidation-related enzymes by hypolipidemic peroxisome proliferators.

Trifluoperazine, a calmodulin antagonist, suppressed the clofibric acid-evoked induction of the peroxisomal cyanide-insensitive fatty acyl-CoA oxidizing system and carnitine acetyltransferase in rat liver and also in cultured rat hepatocytes. H-7, a potent inhibitor of protein kinase C, also suppressed the induction of these enzymes by clofibric acid, bezafibrate, Wyl4,643 or mono(2-ethylhexyl)phthalate in cultured rat hepatocytes. This suppressive effect was also confirmed by the protein composition of hepatocytes treated with clofibric acid and these antagonists, where the increase in the amount of peroxisomal bifunctional enzyme by peroxisome proliferator was markedly suppressed by above two antagonists.

[Effect of antiplatelet and anticoagulant therapy on secondary prevention and long-term prognosis after acute myocardial infarction in aged patients].

The long-term efficacy and side effects of antiplatelet and anticoagulant therapy for secondary prevention after the first acute myocardial infarction (AMI) were retrospectively assessed in 133 patients over 60 years of age during a mean follow-up period of 36.6 months. Seventy five patients received antiplatelet and anticoagulant therapy (group 1) and 58 patients did not (group 2).

Molten titanium flow in a mesh cavity by the flow visualization technique.

The tracer element molten (TEM) method, which provides titanium flow visualization in a mold cavity, was applied to investigate the flow in a mesh pattern. When a pressure casting machine was used, most of the mesh rods were composed of many solidification layers, which implied that the flow was laminar and almost steady. When a centrifugal casting machine was used, the flow was almost irregular and a stack of solidification layers was observed in only a few segments.

Cardiac sequelae of Kawasaki disease in Japan: statistical analysis.

The proportions of Kawasaki disease patients with cardiac sequelae in Japan were analyzed using nationwide survey data from the 6 1/2-year period July 1982 through December 1988. Of 46,864 cases of Kawasaki disease reported in the surveys, 7637 or 16.3% had cardiac sequelae such as dilation or stenosis of coronary arteries, myocardial infarction, and valvar lesions 1 month or more after onset.

Co-suppression by nicardipine, a calcium antagonist, of induction of microsomal lauric acid hydroxylation with peroxisome proliferation in clofibrate-treated rat liver.

The in vivo effect of nicardipine, a well-known calcium antagonist, on microsomal omega-oxidation of laurate in clofibrate-treated rat liver was studied. The 15.3-fold induction of the activity by 2 weeks administration of 0.

[Determination of titanium flow by the tracer element molten method in the dental precision casting. 1. The principle of flow visualization and application to simple castings].

The tracer element molten (TEM) method has been developed for flow visualization of molten Titanium in dental precision casting. The principle of this technique is as follows. When Titanium is cast, the tracer element wire inserted previously into the selective point of the sprue is molten little by little and distributed according to the molten Titanium flow in the mold cavity.

[Reactions at the nonprecious metal-ceramic interface during porcelain firing. (3) A commercial alloy forming much Cr oxide during firing].

To examine the interface reaction between porcelain and a commercial Ni-Cr dental alloy (containing higher Cr and Mo) during porcelain firing, electron probe microanalyzer (EPMA) and X-ray diffraction have been used to characterize the interface which has emerged by means of selective dissolution of the alloy caused by a bromine-methanol solution. Much Cr oxide was formed at the early stage of firing, and remained in the reaction layer even if the holding time at 960 degrees C was up to 8 minutes. As a result, many Cr atoms diffused into the porcelain layer, most of which was found to form oxides through X-ray diffraction.

[Grinding of titanium. 2. Commercial vitrified wheels made of alumina abrasives].

Cast titanium was ground with commercial vitrified wheels made of alumina abrasives, and their grinding performance was investigated. For cutting, the appropriate circumferential speed of the alumina wheels was about 700 m/min. A speed lower or higher than this yielded unfavorable grinding results, which were attributed to wheel loading or chemical attrition of the abrasive, respectively.

[Grinding of titanium. 1. Commercial and experimental wheels made of silicon carbide abrasives].

Cast titanium was ground with commercial and experimental wheels made of silicon carbide abrasives, and their grinding performance was investigated. With the vitrified wheels made of the GC abrasive, at a higher the wheel circumferential speed and heavier the grinding pressure, the cutting rate was greater, accompanied by violent wear of the wheel. Being independent of the wheel speed, the grinding ratio reached about 1 under pressure heavier than 100 gf.

Layered structure of cast titanium surface.

The present study concerns the surface layered structure of the cast Ti. A commercial Ti was cast into a mold which was made of a phosphate-bonded Al2O3/SiO2 investment. Elemental analyses of the interfacial zone of the casting were made under an electron probe micro-analyzer.

[Reactions at the nonprecious metal-ceramic interface during porcelain firing (2). A commercial alloy containing higher Cr and Si].

To clarify the interface reaction between porcelain and a commercial Ni-Cr dental alloy (containing higher Cr and Si) during porcelain firing, electron probe microanalyzer (EPMA), X-ray diffraction and X-ray fluorescence analysis have been used to characterize the interface which has emerged by means of selective dissolution of the alloy caused by a bromine-methanol solution. At the early stage of firing, tin oxides (SnO2), contained in the porcelain powder, were reduced to Sn metal and the resultant reduction layer was about 10 microns in thickness from the interface. Although in the beginning of firing some Cr oxides were formed at the interface, with increasing retention time (within a few minutes) at 960 degrees C, extremely low oxygen partial pressure caused reduction of even such products.

[Study on grinding of base metal alloys. 5. Constant pressure grinding of a Ni-Cr alloy with electro-deposited wheels].

The grinding techniques and electro-deposited wheels suitable for a 13% Cr-Ni dental casting alloy were determined. The lever-type grinding test machine modified in the previous study was used to investigate the grinding performance of experimental wheels of CBN- and diamond-particles. Depression of the diamond wheel against the work yielded unfavorable grinding results.

[Study on grinding of base metal alloys. 4. Constant pressure grinding of a Ni-Cr alloy with vitrified wheels].

The grinding techniques and the constituent element of vitrified wheels suitable for a 13% Cr-Ni dental casting alloy were determined. The lever-type grinding test machine used in the previous study was modified so that a work might be ground under a constant pressure as it moved reciprocally within a short stroke along the tangential direction of a rotating wheel. The grinding performance of two marketed wheels and eleven experimental wheels with different constituent elements was tested.

Clinical application of Hobel's high-risk pregnancy scoring system.

Hobel's high-risk pregnancy screening scoring system was applied to 1,000 deliveries prospectively to test the validity of the screening system. Our results showed that the incidence of high-risk neonates increased significantly as the risk scores during the prenatal and intrapartum periods increased. In this series, 57.