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Santos MB, Jo J, Suen YW, Engel LW, Shayegan M. Effect of Landau-level mixing on quantum-liquid and solid states of two-dimensional hole systems. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:13639-13642. [PMID: 10003420 DOI: 10.1103/physrevb.46.13639] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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127
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Jo J, Suen YW, Engel LW, Santos MB, Shayegan M. Quantum Hall effect in a triple-layer electron system. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:9776-9779. [PMID: 10002792 DOI: 10.1103/physrevb.46.9776] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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128
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Fritze M, Chen W, Nurmikko AV, Jo J, Santos M, Shayegan M. Many-electron excitons and Fermi-edge singularities in wide, parabolic (Al,Ga)As quantum wells. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:8408-8412. [PMID: 10000677 DOI: 10.1103/physrevb.45.8408] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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129
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Molina R, Ojeda B, Filella X, Borras G, Jo J, Mas E, Lopez JJ, Ballesta A. A prospective study of tumor markers CA 125 and CA 19.9 in patients with epithelial ovarian carcinomas. Tumour Biol 1992; 13:278-86. [PMID: 1290025 DOI: 10.1159/000217776] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
In a prospective study, CA 125 and CA 19.9 serum levels were measured in 229 patients with ovarian cancer [121 with active disease, 108 in complete remission (CR)], and in 20 patients with other malignancies. Abnormal levels of CA 125 were found in 90% of patients with active ovarian cancer, in 1.8% of those in CR and in 38% of cases with other malignancies. Abnormal CA 19.9 serum levels were found in 36, 9 and 48% of these groups, respectively. Serum levels of both tumor markers were related to tumor stage and histological type. The highest levels of CA 125 were found in serous adenocarcinoma and the lowest in the mucinous type (p < 0.0001). In contrast, significantly higher CA 19.9 values were found in mucinous carcinoma than in other histologies (p < 0.0001). CA 125 and CA 19.9 were useful for monitoring disease activity in 88.3 and 32%, respectively, while one or other tumor marker was useful in 92% of patients. At the time of the second-look operation, abnormal CA 125 serum levels were found in 32% (6/19) of patients with active disease and in none of those with CR (0/38). CA 125 sensitivity was 83% (5/6) in those patients with residual tumor > 2 cm and in 8% (1/13) in those with tumor < 2 cm. CA 19.9 values were abnormally high in 16% of cases with persistent disease and in 11% of CR patients. In conclusion, our results confirm that CA 125 is a useful marker in ovarian carcinoma. CA 19.9 improves the results obtained with CA 125 alone only in mucinous adenocarcinomas.
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130
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Jo J, Hendricks RW. Diffractometer misalignment errors in X-ray residual stress measurements. J Appl Crystallogr 1991. [DOI: 10.1107/s002188989001322x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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131
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Suen YW, Jo J, Santos MB, Engel LW, Hwang SW, Shayegan M. Missing integral quantum Hall effect in a wide single quantum well. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:5947-5950. [PMID: 9998451 DOI: 10.1103/physrevb.44.5947] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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132
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Son D, Jo J, Sugiyama T. Purification and characterization of alanine aminotransferase from Panicum miliaceum leaves. Arch Biochem Biophys 1991; 289:262-6. [PMID: 1898070 DOI: 10.1016/0003-9861(91)90470-4] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Three alanine aminotransferases, two minor (AlaAT-1, AlaAT-3) and one major (AlaAT-2), were detected by native gel electrophoresis of leaf extracts from Panicum miliaceum L. AlaAT-2 was purified to homogeneity and a specific polyclonal antibody was raised against it which did not react with the other two forms of the enzyme. The enzyme, with an apparent molecular size of 102 kDa, appeared to be a dimer of a single 50-kDa polypeptide. The enzyme has a relatively broad pH optima with similar curves for the forward and reverse directions, ranging between 6.5 and 7.5. The Km values of this enzyme were 6.67, 0.15, 5.00, and 0.33 mM for alanine, 2-oxoglutarate, glutamate, and pyruvate, respectively. The activity of AlaAT-2 was found to increase markedly during leaf greening in parallel with the increase of immunochemically titrated protein, and it is suggested to function in the C4 photosynthetic cycle.
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Molina R, Filella X, Bruix J, Mengual P, Bosch J, Calvet X, Jo J, Ballesta AM. Cancer antigen 125 in serum and ascitic fluid of patients with liver diseases. Clin Chem 1991; 37:1379-83. [PMID: 1868598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Serum concentrations of cancer antigen 125 (CA 125) were determined for 373 patients with various liver diseases: 57 with acute hepatitis, 57 with chronic hepatitis, 244 with liver cirrhosis (86 compensated and 158 decompensated), and 15 with primary liver cancer. The antigen was measured simultaneously in the serum and ascitic fluid of 46 of the patients with liver cirrhosis and sequentially in the serum and ascitic fluid of another 25 cirrhotics treated with paracentesis and (or) diuretics. Abnormal results for CA 125 were detected in sera from 4% of the patients with acute or chronic hepatitis, 60% of the patients with liver cirrhosis, and 67% of the patients with primary liver cancer. The main factor associated with abnormal serum concentrations of this antigen was the presence of ascites, with pathological CA 125 values in 94% of patients with ascites without jaundice (mean 566 +/- 528 arb. units/mL), compared with only 40% of patients with jaundice and without ascites (mean 40.1 +/- 28.5 arb. units/mL) (P less than 0.001). High concentrations of CA 125 were mainly associated with spontaneous bacterial peritonitis. The serum concentration of CA 125 decreased after treatment with paracentesis, but increased in patients treated with diuretics rather than paracentesis. The release of this antigen in liver cirrhosis appears to be independent of the liver disorder and, rather, results from peritoneal synthesis of this antigen.
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Filella X, Molina R, Jo J, Mas E, Ballesta AM. Serum phosphohexose isomerase activities in patients with colorectal cancer. Tumour Biol 1991; 12:360-7. [PMID: 1798910 DOI: 10.1159/000217737] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Pretreatment levels of phosphohexose isomerase (PHI) were above the cutoff limit of 107 IU/l in 41% of patients with benign intestinal diseases and in 46% of patients with colorectal cancer. Sensitivity of PHI was related to the presence of distant metastasis and the location of the primary tumor. Patients with rectal tumors presented a lower sensitivity than patients with colonic tumors. Pretreatment levels of PHI had prognostic value and patients with elevated levels of this enzyme showed a shorter disease-free interval in comparison with those patients with normal PHI activities. However, the prognostic significance of PHI was not independent of Dukes' classification. The present study indicates that PHI is not useful in the follow-up of patients with colorectal cancer after curative surgery because of its low sensitivity in the diagnosis of recurrences (47%) and its low specificity in patients without evidence of disease (76%).
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Shayegan M, Jo J, Suen YW, Santos M, Goldman VJ. Collapse of the fractional quantum Hall effect in an electron system with large layer thickness. PHYSICAL REVIEW LETTERS 1990; 65:2916-2919. [PMID: 10042731 DOI: 10.1103/physrevlett.65.2916] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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136
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Filella X, Molina R, Bedini JL, Jo J, Joseph J, Ballesta AM. Clinical usefulness of CEA as tumor marker in patients with colorectal cancer. THE JOURNAL OF NUCLEAR MEDICINE AND ALLIED SCIENCES 1990; 34:107-10. [PMID: 2092102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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137
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Filella X, Cases A, Molina R, Jo J, Bedini JL, Revert L, Ballesta AM. Tumor markers in patients with chronic renal failure. Int J Biol Markers 1990; 5:85-8. [PMID: 1704405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
In order to evaluate the specificity of tumor markers in chronic renal failure, we have determined serum levels of carcinoembryonic antigen (CEA), carbohydrate antigen 19.9 (CA 19.9), carbohydrate antigen 50 (CA 50), alphafetoprotein (AFP), neuron-specific enolase (NSE), prostatic acid phosphatase (PAP), prostatic specific antigen (PSA), squamous cell carcinoma antigen (SCC), carbohydrate antigen 15.3 (CA 15.3) and carbohydrate antigen 125 (CA 125) in 30 patients with chronic renal failure and in 36 hemodialyzed patients without clinical evidence of neoplasia. CEA, CA 50, NSE and SCC frequently show increased serum levels, suggesting a renal metabolism, while others remain, generally, within the normal levels.
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Filella X, Molina R, Jo J, Umbert B, Bedini JL, Ballesta AM. Clinical usefulness of prostate-specific antigen and prostatic acid phosphatase in patients with prostatic cancer. Tumour Biol 1990; 11:289-94. [PMID: 1700860 DOI: 10.1159/000217664] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Serum prostate-specific antigen (PSA) and prostatic acid phosphatase (PAP) levels were measured in 70 patients with benign prostatic hypertrophy (BPH) and in 70 patients with prostatic cancer. PSA was increased above the cutoff level of 10 ng/ml in 13% of patients with BPH and in 87% of patients with prostatic cancer. In contrast, abnormal PAP levels were found in 14 and 76% of patients, respectively. We concluded that, due to its high specificity, PSA is a useful marker in the management of patients with prostatic carcinoma and that it surpasses PAP in this regard.
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Shayegan M, Sajoto T, Jo J, Santos M, Drew HD. Electron states of a wide quantum well in a tilted magnetic field. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 40:3476-3479. [PMID: 9992313 DOI: 10.1103/physrevb.40.3476] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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140
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Sajoto T, Jo J, Engel L, Santos M, Shayegan M. Subband structure of a nearly free, uniform-density, dilute electron system in a wide quantum well. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 39:10464-10466. [PMID: 9947853 DOI: 10.1103/physrevb.39.10464] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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141
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Jo J, Ishihara N, Kikuchi G. Occurrence and properties of four forms of phosphoenolpyruvate carboxykinase in the chicken liver. Arch Biochem Biophys 1974; 160:246-54. [PMID: 4828524 DOI: 10.1016/s0003-9861(74)80031-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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