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T Konjiki

Publications and source records attributed to T Konjiki.

10 recordsLinked to original sources
PubMed1987

Study of calcium phosphate crystalluria.

When the frequency of heavy calcium phosphate crystalluria was compared among postprandial urine specimens collected from 152 healthy persons (group 1) and 108 patients with calcium urolithiasis (group 2), there was no significant difference between these groups. However, the frequency of crystalluria was significantly greater in 49 patients in group 2 who required or had required surgical intervention for calcium stone disease than in group 1 (p less than 0.05). Calcium phosphate precipitates collected from 7 urine specimens by repeated centrifugation were studied by infrared, X-ray, thermal and electron probe analyses. The principal component of the precipitates was poorly crystallized apatite associated with some organic material. The precipitates from the 7 samples appeared as aggregates of fine spherules less than 1 micron. in diameter, and the calcium-to-phosphate molar ratio of a spherule ranged from 1.02 to 1.19. We conclude that not only calcium oxalate crystalluria but calcium phosphate crystalluria may have an important role in the formation of urinary stones.

Adult↗
PubMed1986

[Study of the transformation of weddellite to whewellite in calcium oxalate stones by x-ray diffraction].

A clay film was made of the stone powder and water drops on a slide glass and dried at 100 to 110 degrees C or at room temperature in the horizontal position for 20 calcium oxalate stones which had been received between April, 1978 and August 1980. Each clay film was scanned with an X-ray diffractometer using CuK alpha radiation, stored at room temperature in a wooden sample case and analysed again by X-ray five to seven years after the first X-ray analysis. Then the recent diffractograms of 20 powder samples were compared with the previous ones regarding the peak heights at 14.2 degrees, 14.8 degrees and 25.8 degrees (2 theta), which were considered representative of weddellite, whewellite and apatite contents and designated as Iwe, Iwh and Iap, respectively. Since there was a good correlation between Iwe/Iwe + Iwh + Iap and weddellite/weddellite + whewellite + apatite that was determined by thermogravimetry (Fig. 1), the transformation rate of weddellite to whewellite can be expressed as the change of Iwe/Iwe + Iwh + Iap. One sample Iwe/Iwe + Iwh + Iap of which decreased by 48% in seven years (Fig. 3) and another sample Iwe/Iwe + Iwh + Iap of which increased by 10% in five years (Table) were excluded from this study because the clay films of these samples might have been overheated or incompletely dried before the first X-ray analysis.(ABSTRACT TRUNCATED AT 250 WORDS)

Calcium Oxalate↗
PubMed1983

Study of passed stones by means of X-rays, infrared and thermal analyses.

X-ray powder diffraction, infrared spectroscopy and thermal analysis were used to study 108 stones that had been passed spontaneously from the upper urinary tract. The presence of apatite in pure calcium oxalate stones classified by x-ray diffraction was confirmed by infrared analysis of the ignited product. Consequently, 102 of 108 stones were found to be composed of weddellite and/or whewellite, and apatite. Besides the contents of weddellite, whewellite and apatite, the content of organic matrix also was estimated by thermal analysis in 102 stones, ranging from 1.1 to 17.2 per cent. The stones then were divided into 3 groups according to the principal constituent: 1) weddellite, 2) whewellite and 3) apatite. Weddellite stones were significantly heavier and significantly higher in apatite content than whewellite stones. It is suggested that weddellite calculi tend to become larger than whewellite stones. The apatite content was correlated with the ratio of weddellite to weddellite plus whewellite ( r equals 0.528), and the content of organic matrix was correlated with the whewellite content (r equals 0.708). Thus, it is considered that the weddellite-apatite and whewellite-organic matrix associations have important roles in the development and growth of weddellite and whewellite calculi, respectively.

Apatites↗
PubMed1981

Chemical test of phosphates in urinary stones by means of the chromatographic contact print method.

The chromatographic contact print method, making use of the ammonium phosphomolybdate-ascorbic acid reaction, is used to detect phosphates and to view their distribution in urinary stones. This sensitive reaction may take place even if phosphates, especially apatite, are present in such small amounts as to be under the confirmation limits of microscopic observation, and X-ray and infrared analyses.

Apatites↗
PubMed1980

Mineralogical notes of apatite in urinary calculi.

Apatite in some samples of common urinary calculi consisting mainly of apatite or of calcium oxalate and apatite was subjected to X-ray and thermal analysis and electron microscopic investigation. The X-ray analysis has determined the lattice parameters agreeing with hydroxyapatite, and the mean crystallite size normal to the basal plane in a range of 200-800 A. The thermal analysis is given by differential thermal analysis (DTA) and thermogravimetric (TG) curves. From the TG curve of a mixed apatite-calcium oxalate calculus, an approach is given to estimate the proportions of the constituent materials; the result is as follows: whewellite, 51.7%; weddellite, 16.6%; apatite, 19.1%; and organic materials, 12.6%. Analysis with the scanning electron microscope with energy dispersive X-ray spectrometer has shown that apatite is found as tiny spherules (5-10 micrometer in diameter) with fluffy surfaces resulting from projecting fine fibers or needles (about 0.5 micrometers in length). The fibers are considered to be mosaic aggregates of crystallites. The spherules fill interspaces of well-formed oxalate crystals or are included sporadically in individual crystals. Occasionally well-formed crystal-shaped oxalates are bordered with narrow bands consisting of apatite spherules (often as hemispheres) linked in a row.

Apatites↗
PubMed1976

Congenital renal arteriovenous fistula: case report, review of Japanese literature and description of non-radical treatment.

A case of congenital arteriovenous fistula diagnosed by measuring the oxygen saturation difference of renal veins at the time of selective renal angiographic examination and a review of 38 relevant Japanese cases are reported. The English as well as the Japanese literature was reviewed. Treatment has consisted of partial nephrectomy, ligation of the branch artery supplying the fistula and intentional embolization of the arterial branches, feeding the shunt by catheter.

Aged↗
PubMed1976

Linear straited vascular pattern: its implication on a renal angiogram clinical importance and pathologic verification.

A case of hypernephroma with neoplastic extension to the renal vein showing a characteristic linear striated vascular pattern on a renal angiogram is presented. A nephrectomy specimen was examined pathologically and angiographic correlation subsequently was inferred. Implication of this unusual pattern on the renal angiogram is emphasized through our experience and review of relevant literature in order to predict the prognosis and to prepare for radical treatment.

Adenocarcinoma↗