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  • 1
    Electronic Resource
    Electronic Resource
    Pulse excitation method for measurement of high frequency magnetic properties of large cores (abstract) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6875-6875 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is very important to obtain saturated magnetic properties from reverse saturation (full B-H curve) of ferromagnetic cores to design magnetic switches which are used in high power pulse generators. The magnetic switch is excited in the high frequency range (∼MHz). But, it is extremely difficult to measure full B-H curve of large toroidal cores of which diameter is some hundreds of mm, using the conventional ac excitation method at high frequency. The main reason is poor output ability of power source for core excitation. Therefore we have developed pulse excitation method to get high frequency magnetic properties. The measurement circuit has two sections. One is excitation part composed by charge transfer circuit. The others is reset part for adjustment initial point on direct B-H curve. The sample core is excited by sinusoidal voltage pulse expressed as 1−cos(2π ft). Excitation frequency f is decided by the constants of the elements of the charge transfer circuit. The change of magnetic flux density ΔB and magnetic field H are calculated, respectively, by measuring the induced voltage of search coil and magnetizing current. ΔB-H characteristics from reverse saturation of four different kinds of large cores were measured in frequency range from 50 kHz to 1 MHz. Core loss increases in proportion to Nth powers of the frequency, where the index N depends on each of cores. N is about 0.5 in case of winding ribbon cores, such as Fe-based amorphous, Co-based amorphous, and Finemet, but N is about 0.2 in case of the Ni-Zn ferrite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352468
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  • 2
    Electronic Resource
    Electronic Resource
    Cloning and Characterization of Sodium Channel cDNA from Puffer Fish (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 707 (1993), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1993.tb38066.x
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  • 3
    Electronic Resource
    Electronic Resource
    Synchronous double cancers of the remnant stomach and pancreas: Report of a case (1995)
    Springer
    Surgery today 25 (1995), S. 1038-1042 
    Details
    ISSN: 1436-2813
    Keywords: synchronous double cancers ; remnant stomach ; pancreas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We present here in the case of a 75-year-old man who developed synchronous double cancers of the remnant stomach and pancreas 12 years after undergoing distal gastrectomy for gastric carcinoma. The patient was referred to our hospital in March, 1993, with a provisional diagnosis of carcinoma of the remnant stomach. Laboratory data on admission showed an abnormal level of CA19-9 (116.1 U/ml) and positive occult blood in the stools. An upper gastrointestinal series and gastroendoscopy demonstrated an ulcerative polypoid tumor in the gastric stump proximal to the gastroduodenostomy anastomosis, and a biopsy confirmed the findings of mucinous adenocarcinoma. Abdominal computed tomography (CT) scan revealed a low-density nodule anterior to the abdominal aorta, suggestive of a nodal metastasis. A laparotomy was performed which also disclosed a low-density mass located within the head of the pancreas. The patient was subsequently diagnosed as having double carcinomas of the remnant stomach and pancreas, and total gastrectomy and pancreatoduodenectomy were carried out. The histologic sections from the remnant stomach showed mucinous adenocarcinoma, whereas those from the pancreas showed tubular adenocarcinoma. Double carcinomas in this association are extremely rare and this case may in fact be the first observation of synchronous double cancers of the remnant stomach and pancreas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00311689
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  • 4
    Electronic Resource
    Electronic Resource
    Immunohistochemical and electron microscopic findings in a case of mixed hamartoma of the liver (1990)
    Springer
    Surgery today 20 (1990), S. 101-106 
    Details
    ISSN: 1436-2813
    Keywords: mixed hamartoma ; liver ; immunohistochemistry ; ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A case of mixed hamartoma of the liver in a 36 day old female infant is reported herein. The resected tumor was well demarcated, measured 7.5×7.0 cm and weighed 179 gm. Microscopically, the tumor was composed of loose fibrous stroma intermingled with spindle and polygonal cells and ductular structures. The spindle and polygonal tumor cells displayed the distinct cytoplasmic staining for alpha-1-antitrypsin. Most of the tumor cells showed the characteristic ultrastructural features of immature hepatocytes, having numerous cytoplasmic microvillous structures, abundant rough and smooth endoplasmic reticulum and mitochondria. These findings suggest that embryonic liver cells, which are capable of transforming into biliary structures and hepatocytes, serve as essential elements of mixed hamartoma of the liver.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02470721
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  • 5
    Electronic Resource
    Electronic Resource
    CP-82,996, a novel diglycoside polyether antibiotic related to monensin and produced byActinomadura sp. (1990)
    Springer
    Journal of industrial microbiology and biotechnology 6 (1990), S. 135-142 
    Details
    ISSN: 1476-5535
    Keywords: Ionophore ; Actinomadura sp. (ATCC 53764) ; Anticoccidial agent
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary A new polyether antibiotic CP-82,996 (C50H86O16) was isolated by solvent extraction from the fermentation broth ofActinomadura sp. (ATCC 63764). Following purification by silica gel column chromatography and crystallization, the structure of CP-82,996 was determined by a single crystal X-ray analysis. The structure is closely related to monensin, but is unique in that it contains two sugar groups, whereas monensin has none. The1H and13C NMR chemical shifts and assignments for CP-82, 996 were elucidated, and they were compared with those determined previously for monensin. CP-82,996 is active against certain Gram-positive bacteria, and is a very potent anticoccidial agent. It effectively controlled chicken coccidiosis caused by severalEimeria species at 5–10 ppm in feed, and is 10–20 times more potent than monensin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01576433
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of base substitutions in the colicin E1 gene on colicin E1 export and bacteriocin activity (1986)
    Springer
    Molecular genetics and genomics 202 (1986), S. 24-29 
    Details
    ISSN: 1617-4623
    Keywords: Base substitutions ; Colicin E1 ; Protein export ; Bacteriocin activity ; Localized mutagenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Base substitutions have been introduced into the segment of the colicin E1 gene corresponding to the polypeptide region between the 404th and the 502nd residues which was considered to participate in colicin E1 export and bacteriocin activity. The methods used were in vitro localized mutagenesis with sodium bisulphite and in vivo mutagenesis using either nitrosoguanidine or ethyl methane sulphonate. Cells carrying mutagenized plasmids were screened by their inability to form a clear zone on a lawn of colicin E1 sensitive cells. Mutation sites were determined from the nucleotide sequence analysis and the altered amino acid residues were reduced. The mutant proteins were analysed for their ability to be exported to the periplasmic space and for their bacteriocin activity. Out of eight mutants obtained, three had a single amino acid replacement. Mutant proteins that had Ser and Glu in place of Pro-462 and Gly-502, respectively, showed a decrease in both the export and the bacteriocin activity. A mutant protein having Arg in place of Gly-439 showed a decrease only in the bacteriocin activity. These results suggest that the target region of colicin E1 contributes to the export as well as the bacteriocin activity but the two functions are supported in part by different amino acid residues of the protein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00330511
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  • 7
    Electronic Resource
    Electronic Resource
    Plexiform leiomyoma of the esophagus: A peculiar gross variant simulating plexiform neurofibroma (1996)
    Springer
    Journal of gastroenterology 31 (1996), S. 100-104 
    Details
    ISSN: 1435-5922
    Keywords: leiomyoma ; plexiform variant ; esophagus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A plexiform variant of leiomyoma of the esophagus in a 51-year-old woman is reported. The patient was diagnosed with a tumor of the esophagus in an X-ray mass survey of the upper gastrointestinal tract. She was referred to the Ryukyu University Hospital for further examination. She appeared healthy with no complaints. Upper gastrointestinal series revealed an oval, well-defined filling defect in the lower esophagus just above the esophagogastric junction. Endoscopy revealed an undulating bulge covered with normal esophageal mucosa. Endoscopic ultrasonography showed a sharply demarcated hypoechoic mural tumor with internal linear pattern, with no evidence of penetration into the surrounding tissue. These findings were evaluated as consistent with a leiomyoma. Removing the tumor by enucleation was easily accomplished. Unexpectedly, on gross inspection, the tumor was a plexiform type, mimicking a plexiform neurofibroma. Light and electron microscopic examination and immunohistochemistry of the tumor tissue confirmed leiomyoma. Since the enucleation of the tumor, the patient has been free of recurrence and symptoms for 1.5 years at the time of this report.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01211194
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  • 8
    Electronic Resource
    Electronic Resource
    Oxidation resistance of silicon nitride ceramics with various additives (1990)
    Springer
    Journal of materials science 25 (1990), S. 3790-3794 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Five silicon nitride ceramics with various additives were evaluated for their oxidation resistance at 1300 ° C in flowing dry and wet air. In a dry atmosphere, the oxidation of all types of Si3N4 except one proceeded in two stages with different reaction rates nearly following the parabolic law. In a wet atmosphere, all types showed a linear relationship between weight gain by oxidation and water varpour content. The water vapour in the atmosphere slightly accelerated the oxidation. The influence of oxidation on room-temperature strength was complex, but there was no observed distinguishable difference of the effect on the flexural strength between dry and wet oxidation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00575420
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  • 9
    Electronic Resource
    Electronic Resource
    Superplasticity in β-silicon nitride whisker-reinforced 2124 aluminium composite (1990)
    Springer
    Journal of materials science 9 (1990), S. 255-257 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00725816
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