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Tai JJ, Chen MH. A non-excluded set method for the calculation of paternity probability. PROCEEDINGS OF THE NATIONAL SCIENCE COUNCIL, REPUBLIC OF CHINA. PART B, LIFE SCIENCES 1994; 18:36-43. [PMID: 8029373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Forensic judgment of paternity depends on genetic and nongenetic evidence. Sometimes genetic marker tests can provide clear evidence to exclude a falsely accused man, but they do not always succeed. On the other hand, if the accusation is true, the alleged father will not ever be excluded by genetic marker tests. When a nonexclusion case occurs after one or more marker tests, a report of paternity probability is required in the court. The current methods for calculating the paternity probability are the "paternity index method" and the "nonexclusion method." A number of recent articles have openly debated the fallacies, validity and utility of both methods. This paper briefly reviews the two methods and proposes a non-excluded set method along with examples for illustrating the various patterns of paternity probabilities of the three methods.
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202
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Chen MH, Yan K, Zhang JS. [Ultrasonography in differential diagnosis of peripheral pulmonary diseases]. ZHONGHUA YI XUE ZA ZHI 1994; 74:19-22, 62. [PMID: 8032979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
In 87 patients with peripheral pulmonary diseases either adhesive or close to the pleura, who were examined, ultrasonographically 64 had lung cancer and 23 benign lesions were confirmed histopathologically. Five sonographic features including configuration, echogenicity patterns, bronchial air phase in foci, margin, and pleural involvement were significantly different between malignant and benign diseases (P < 0.01). The differential ultrasonography used in this series showed a sensitivity of 61% (14/23), a specificity of 95% (61/64), and an accuracy of 86% (75/87). The results demonstrate that ultrasound is helpful in differentiating the malignant lesion from the benign one in the peripheral lung near the pleura.
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Beiersdorfer P, Knapp D, Marrs RE, Elliott SR, Chen MH. Structure and Lamb shift of 2s1/2-2p3/2 levels in lithiumlike U89+ through neonlike U82+. PHYSICAL REVIEW LETTERS 1993; 71:3939-3942. [PMID: 10055113 DOI: 10.1103/physrevlett.71.3939] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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204
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Abstract
Crotin II isolated from the seeds of Euphorbiacea Croton tiglium has been crystallized. Crystals were grown by vapor diffusion using KCl as the precipitant. The crystal of crotin II belongs to the space group P6(1) or P6(5) with cell parameters a = b = 94.62 A, c = 28.43 A, alpha = beta = 90 degrees, gamma = 120 degrees. The asymmetric unit contains one molecule of 15,000 Da. A data set to 1.82 A has been collected on an area detector.
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Reed KJ, Chen MH. Relativistic effects on the polarization of line radiation emitted from He-like and H-like ions following electron-impact excitation. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1993; 48:3644-3651. [PMID: 9910031 DOI: 10.1103/physreva.48.3644] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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206
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Wong KL, Beiersdorfer P, Chen MH, Marrs RE, Reed KJ, Scofield JH, Vogel DA, Zasadzinski R. Electron-impact ionization of lithiumlike ions: Ti19+, V20+, Cr21+, Mn22+, and Fe23+. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1993; 48:2850-2859. [PMID: 9909934 DOI: 10.1103/physreva.48.2850] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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207
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Simionovici A, Dietrich DD, Keville R, Cowan T, Beiersdorfer P, Chen MH, Blundell SA. Soft-x-ray spectroscopy of Delta n=0, n=3 transitions in highly stripped lead. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1993; 48:3056-3061. [PMID: 9909958 DOI: 10.1103/physreva.48.3056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Abstract
This device consists of a siphon system and 5 or 10 grid disks, modified from the previous mode (Chen, 1973), for large numbers of grids with ultrathin sections. This method improves the ease of assembling grids onto the grid disk and also requires much less stain solution. This system only takes 5 min for one single stain washing, at a maximum of 100 grids, and also avoids stain contamination. The grid disk can also be used for immunocytochemistry work and for critical point drying of grids with biological specimens.
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Pan KZ, Lin YJ, Zhou KJ, Fu ZJ, Chen MH, Huang DR, Huang DH. The crystal and molecular structure of trichosanthin at 2.6 A resolution. SCIENCE IN CHINA. SERIES B, CHEMISTRY, LIFE SCIENCES & EARTH SCIENCES 1993; 36:1069-1081. [PMID: 8274201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The crystallographic refinement of trichosanthin has been performed at 2.6 A resolution. The crystal and molecular structure of trichosanthin is described in detail in this paper. On summarizing the regularity of the amino acid sequences of eight kinds of ribosome inactivating proteins and combining with the crystal and molecular structure of trichosanthin, fifteen most conservative amino acid residues are analyzed. It is found that four most conservative polar amino acid residues Gln156, Glu160, Arg163 and Glu189 gather on the molecular surface on the boundary of the large and small domains, thus forming the active center of the protein molecule.
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Cui Z, Vance JE, Chen MH, Voelker DR, Vance DE. Cloning and expression of a novel phosphatidylethanolamine N-methyltransferase. A specific biochemical and cytological marker for a unique membrane fraction in rat liver. J Biol Chem 1993; 268:16655-63. [PMID: 8344945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Phosphatidylethanolamine N-methyltransferase catalyzes the synthesis of phosphatidylcholine from phosphatidylethanolamine and is most active in liver. A cDNA for this enzyme from a rat liver cDNA library has been cloned, sequenced, and expressed in COS-1 cells, McArdle-RH7777 rat hepatoma cells, and Sf9 insect cells. The expressed protein was capable of converting phosphatidylethanolamine into phosphatidylcholine in intact COS-1 cells, which normally have very low methyltransferase activity. The calculated molecular mass of the methyltransferase protein is 22.3 kDa, which is equivalent to that of the pure protein isolated from rat liver. Comparison of the sequence of the cloned rat liver methyltransferase with the yeast phosphatidylethanolamine methyltransferase PEM2 gene product revealed 44% identical amino acids and 68% similarity in the two predicted protein sequences. A polyclonal antibody was raised against a synthetic peptide corresponding to the carboxyl-terminal region of the enzyme and was affinity purified. The antibody recognized a single protein with a molecular mass of approximately 20 kDa when either rat liver proteins or proteins derived from the transfected COS-1 cells were electrophoresed on polyacrylamide gels containing sodium dodecyl sulfate. Surprisingly, the antibody exhibited no reactivity with endoplasmic reticulum proteins, even though the major phosphatidylethanolamine methyltransferase activity resides on this subcellular organelle. Instead, the antibody specifically recognized a protein in a unique subcellular membrane fraction purified from a crude mitochondrial preparation on a Percoll gradient. Immunocytochemical examination by electron microscopy showed positive labeling only in unique regions of the hepatocytes. The data suggest that this phosphatidylethanolamine methyltransferase is a specific marker for this unique membrane fraction.
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Chen MH, Reed KJ. Effects of relativity and M2 transitions on the resonance contributions to electron-impact ionization of highly charged Li-like ions. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1993; 48:1129-1133. [PMID: 9909714 DOI: 10.1103/physreva.48.1129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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212
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Chen MH, Liu FS, Xu JP. [Chemical constituents of Cistanche deserticola Y.C.Ma]. ZHONGGUO ZHONG YAO ZA ZHI = ZHONGGUO ZHONGYAO ZAZHI = CHINA JOURNAL OF CHINESE MATERIA MEDICA 1993; 18:424-6, 447. [PMID: 8267856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Seven compounds have been isolated from Cistanche deserticola. On the basis of spectral data (NMR, IR, MS, UV) they were identified as beta-sitosterol, daucosterol, succinic acid, triacontanol, acteoside, betaine and polysaccharose.
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Tsai CM, Chang KT, Perng RP, Mitsudomi T, Chen MH, Kadoyama C, Gazdar AF. Correlation of intrinsic chemoresistance of non-small-cell lung cancer cell lines with HER-2/neu gene expression but not with ras gene mutations. J Natl Cancer Inst 1993; 85:897-901. [PMID: 8098377 DOI: 10.1093/jnci/85.11.897] [Citation(s) in RCA: 132] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
BACKGROUND At diagnosis, most small-cell lung cancers (SCLCs) are chemosensitive, whereas non-small-cell lung cancers (NSCLCs) are usually chemoresistant. Activation of ras genes and HER-2/neu genes (also known as ERBB2) is encountered in subpopulations of NSCLC but not in SCLC and has been linked to shortened survival. Therefore, activation of these genes may be associated with intrinsic chemoresistance in NSCLC. Studies have also suggested that the multidrug-resistant phenotype expressed by the MDR1 gene (also known as PGY1) does not correlate with the in vitro chemosensitivity of NSCLC cells or with clinical response to therapy and does not explain the spectrum of cross-resistance to drugs. PURPOSE The purpose of this study was to investigate the relationships between chemoresistance and the presence of ras gene point mutations and overexpression of the HER-2/neu gene in NSCLC cell lines, which indicates gene activation. METHODS Using a panel of 20 NSCLC cell lines established from untreated patients, we assessed the differences in HER-2/neu messenger RNA (mRNA) expression in the cell lines with or without ras mutations. We performed in vitro drug sensitivity testing by the tetrazolium-based MTT [i.e., 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H- tetrazolium bromide] assay with doxorubicin, carmustine, cisplatin, melphalan, mitomycin, and etoposide, and we determined the differences in IC50 values (i.e., the drug concentrations required to inhibit cell growth by 50%) for the cell lines. RESULTS We found a statistically significant correlation between the IC50 values for all six drugs and the degree of HER-2/neu gene expression in all 20 cell lines (r = .67-.86; P < .005) as well as in the subpopulation of eight cell lines with ras mutations (r = .83-.98; P < .05). The IC50 values for doxorubicin, carmustine, cisplatin, and melphalan were not significantly different in the cell lines with or without ras mutations, but the values for mitomycin and etoposide in lines with ras mutations were slightly lower than in those without ras mutations (borderline significance, P = .031). Levels of HER-2/neu expression in cell lines with ras mutations were lower than those without ras mutations, but the difference was not statistically significant. CONCLUSION Our findings indicate that overexpression of HER-2/neu is a marker for intrinsic multidrug resistance in NSCLC cell lines. IMPLICATIONS If the clinical relevance of our findings is confirmed, HER-2/neu gene expression can be used as a predictor of therapeutic failure in NSCLCs. The relationships between HER-2/neu gene expression, cell proliferation, and chemoresistance in NSCLC require further investigation.
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Chen MH. Dielectronic recombination coefficients for Ni-like tantalum. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1993; 47:4775-4778. [PMID: 9909505 DOI: 10.1103/physreva.47.4775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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215
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Chen MH. Relativistic-intermediate-coupling calculations of angular distributions in resonant Auger decay. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1993; 47:3733-3738. [PMID: 9909378 DOI: 10.1103/physreva.47.3733] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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216
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Chen MH, Cheng KT, Johnson WR. Relativistic configuration-interaction calculations of n=2 triplet states of heliumlike ions. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1993; 47:3692-3703. [PMID: 9909374 DOI: 10.1103/physreva.47.3692] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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217
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Chen MH. [Significance of monitoring the osmole and osmolar gaps in nursing]. ZHONGHUA HU LI ZA ZHI = CHINESE JOURNAL OF NURSING 1993; 28:215-7. [PMID: 8339374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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218
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Bruch R, Schneider D, Chen MH, Chung KT, Davis BF. Erratum: Atomic K-shell binding energies of multiply charged neon ions studied by zero-degree Auger-electron spectroscopy. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1993; 47:3457. [PMID: 9909336 DOI: 10.1103/physreva.47.3457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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219
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Chen MH. [Diagnostic value of morphological change observed by ultrasonography from skin surface in patients with cervical esophagus carcinoma]. ZHONGHUA YI XUE ZA ZHI 1993; 73:213-6, 253. [PMID: 8395314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The ultrasonography of cervical esophagus from skin surface was performed in 35 healthy adults (HA) and 46 patients with esophageal carcinoma which consisted of upper segment (USEC, n = 24) and lower one (LSEC, n = 22) divided by the level of sternoclavicular joint. The changes of the thickness of anterior wall and the luminal dimensions in the upper region were observed before and after phonating, respectively. The wall of HA was less than 2mm in thickness and became markedly thick after phonation (P < 0.05); meanwhile the lumen was evidently dilated (P < 0.01). USEC showed an irregular wall which was more than 4mm and not altered with phonation (P > 0.05). The significant differences of the above two morphologic alterations existed between HA and USEC respectively (P < 0.05 or P < 0.01). The results of LSEC were similar to HA (P > 0.05). We, therefore, establish standards for abnormal cervical esophagus to assist in the diagnosis of cervical esophageal carcinoma.
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Knapp DA, Marrs RE, Schneider MB, Chen MH, Levine MA, Lee P. Dielectronic recombination of heliumlike ions. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1993; 47:2039-2046. [PMID: 9909156 DOI: 10.1103/physreva.47.2039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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221
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Chen MH, Reed KJ. Indirect contributions to electron-impact ionization of Kr24+, Kr25+, and Xe43+. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1993; 47:1874-1877. [PMID: 9909141 DOI: 10.1103/physreva.47.1874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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222
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Schaphorst SJ, Kodre AF, Ruscheinski J, Crasemann B, berg T, Tulkki J, Chen MH, Azuma Y, Brown GS. Multielectron inner-shell photoexcitation in absorption spectra of Kr: Theory and experiment. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1993; 47:1953-1966. [PMID: 9909149 DOI: 10.1103/physreva.47.1953] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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223
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DeWitt DR, Schneider D, Chen MH, Schneider MB, Church D, Weinberg G, Sakurai M. Dielectronic recombination cross sections of fluorinelike xenon. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1993; 47:R1597-R1600. [PMID: 9909210 DOI: 10.1103/physreva.47.r1597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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224
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Schuch R, Schneider D, Knapp DA, DeWitt D, McDonald J, Chen MH, Clark MW, Marrs RE. Evidence for internal dielectronic excitation of slow highly charged uranium ions. PHYSICAL REVIEW LETTERS 1993; 70:1073-1076. [PMID: 10054279 DOI: 10.1103/physrevlett.70.1073] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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225
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Springer PT, Fields DJ, Wilson BG, Nash JK, Goldstein WH, Iglesias CA, Rogers FJ, Swenson JK, Chen MH, Bar-Shalom A, Stewart RE. Spectroscopic absorption measurements of an iron plasma. PHYSICAL REVIEW LETTERS 1992; 69:3735-3738. [PMID: 10046900 DOI: 10.1103/physrevlett.69.3735] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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226
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Macdonald RL, Weir BK, Grace MG, Chen MH, Martin TP, Young JD. Mechanism of cerebral vasospasm following subarachnoid hemorrhage in monkeys. Neurol Sci 1992; 19:419-27. [PMID: 1423039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
This paper reviews our recent studies on the mechanism of cerebral vasospasm following subarachnoid hemorrhage (SAH) in monkeys. Middle cerebral artery (MCA) vasospasm was maximal at 7 days, resolving by 14 days, and absent at 28 days after SAH. Arterial fibrosis was not detected during vasospasm, although there was intimal hyperplasia with fibrosis 28 days after SAH. On scanning electron microscopy, smooth muscle cells from vasospastic arteries had corrugated cell membranes and appeared similar to cells contracted pharmacologically, suggesting that vasospastic smooth muscle is contracted. Morphometric analysis of arteries obtained 7 days after SAH showed no significant increases in arterial wall area of vasospastic arteries compared with normal MCAs. The results suggest vasospasm in monkeys is not due to hypertrophy, hyperplasia, or fibrosis in the arterial wall. Vasospasm may be mainly vascular smooth muscle contraction, which damages the arterial wall, leading to secondary structural changes in the arterial wall which occur after angiographic vasospasm.
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Lu CP, Teng RJ, Chen MH, Liao KS, Ho MM, Hwang KC. Intestinal malrotation and gastric perforation in a newborn with tetralogy of Fallot: report of one case. ZHONGHUA MINGUO XIAO ER KE YI XUE HUI ZA ZHI [JOURNAL]. ZHONGHUA MINGUO XIAO ER KE YI XUE HUI 1992; 33:446-9. [PMID: 1306930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Gastric perforation with gastrointestinal anomaly is rare in newborns. A case of Tetralogy of Fallot with both malrotation and gastric perforation is reported. Before operation, malrotation was diagnosed from the x-ray films. Laparotomy disclosed a linear perforation on the posterior wall of the gastric body. Mechanical obstruction might have played a role in this case.
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Chen MH, Chen CC. Plant regeneration from Carica protoplasts. PLANT CELL REPORTS 1992; 11:404-407. [PMID: 24201542 DOI: 10.1007/bf00234370] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/1992] [Revised: 03/19/1992] [Indexed: 06/02/2023]
Abstract
Rapidly proliferating and highly regenerable suspension cultures of somatic embryos of Carica papaya x C. cauliflora were used for protoplast isolation. On average, protoplast yield was 1.5×10(6)/g fresh weight of somatic embryos. Protoplasts were first cultured in liquid KM8P-S medium for 2 weeks and then plated in the same medium solidified with 1% agarose. About 1.4% of the protoplasts developed directly into somatic embryos. Protoplast-derived somatic embryos proliferated rapidly through direct embryogenesis on modified MS medium supplemented with 1 mg/1 ABA, and developed into plantlets upon transfer to MS medium devoid of plant growth regulators. The plantlets were successfully transplanted to soil.
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Hu PJ, Li YY, Mitchell HM, Zhou MH, Chen MH, Du GG, Huang BJ, Lee A, Hazell SL. Oxyntic and antral gastritis in the People's Republic of China: diagnosis and relationship to Helicobacter pylori. Am J Gastroenterol 1992; 87:741-5. [PMID: 1590312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
This study investigates the relationship between gastritis and Helicobacter pylori infection in the Chinese population. Particular focus was placed upon the grading of gastritis, using the recently developed "Sydney system." Five diagnostic procedures were used to establish H. pylori status, all of which were found to be highly sensitive and specific. Histological chronic gastritis was reported in 93/108 (86.1%) of the patients examined, H. pylori infection being present in 73/93 (78.5%), and in no patient with histologically normal mucosae. There was a relatively high incidence of idiopathic antral gastritis within the gastritic population, 20/93 (21.5%). In the H. pylori-positive group, 10/73 (13.7%) had pangastritis, 57/73 (78.1%) had pangastritis-antrum-predominant, and 6/73 (8.2%) had antral-only gastritis. The level of activity was significantly higher in the antrum; however, the distribution of bacteria between the antrum and body was not significantly different. There is a need for additional studies examining the specific topographical relationship between H. pylori, the histology, and gastroduodenal disease.
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Bruch R, Schneider D, Chen MH, Chung KT, Davis BF. Atomic K-shell binding energies of multiply charged neon ions studied by zero-degree Auger-electron spectroscopy. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1992; 45:4476-4480. [PMID: 9907523 DOI: 10.1103/physreva.45.4476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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232
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Chen MH. Resonant transfer and excitation in collisions of chlorinelike ions with H2 targets. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1992; 45:4604-4609. [PMID: 9907539 DOI: 10.1103/physreva.45.4604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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233
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Reed KJ, Chen MH. Distorted-wave calculations of cross sections for electron-impact ionization of lithiumlike ions. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1992; 45:4519-4524. [PMID: 9907529 DOI: 10.1103/physreva.45.4519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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234
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Chen MH, Reed KJ. Electron-impact ionization of highly charged lithiumlike ions. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1992; 45:4525-4529. [PMID: 9907530 DOI: 10.1103/physreva.45.4525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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235
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DeWitt DR, Schneider D, Chen MH, Clark MW, McDonald JW, Schneider MB. Dielectronic recombination cross sections of neonlike xenon. PHYSICAL REVIEW LETTERS 1992; 68:1694-1697. [PMID: 10045197 DOI: 10.1103/physrevlett.68.1694] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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236
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Schneider MB, Knapp DA, Chen MH, Scofield JH, Beiersdorfer P, Bennett CL, Henderson JR, Levine MA, Marrs RE. Measurement of the LMM dielectronic recombination resonances of neonlike gold. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1992; 45:R1291-R1294. [PMID: 9907222 DOI: 10.1103/physreva.45.r1291] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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237
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Chen MH. Effect of intermediate coupling on angular distribution of Auger electrons. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1992; 45:1684-1689. [PMID: 9907151 DOI: 10.1103/physreva.45.1684] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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238
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DeWitt DR, Schneider D, Clark MW, Chen MH, Church D. Dielectronic-recombination cross sections of hydrogenlike argon. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1991; 44:7185-7188. [PMID: 9905858 DOI: 10.1103/physreva.44.7185] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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239
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Bruch R, Schneider D, Chen MH, Chung KT, Davis BF. Projectile K Auger spectra of Li-, Be-, and B-like multiply charged Ne ions: Auger energies, Auger rates, and intensity ratios. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1991; 44:5659-5673. [PMID: 9906627 DOI: 10.1103/physreva.44.5659] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Reed KJ, Chen MH, Moores DL. Excitation-autoionization in highly charged sodiumlike ions. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1991; 44:4336-4344. [PMID: 9906472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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241
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Beiersdorfer P, Chen MH, MacLaren S, Marrs RE, Vogel DA, Wong K, Zasadzinski R. Measurements of radiative branching ratios of K x-ray transitions in Cr21+, Mn22+, Fe23+, Ni25+, and Ge29+. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1991; 44:4730-4733. [PMID: 9906518 DOI: 10.1103/physreva.44.4730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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242
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Macdonald RL, Weir BK, Chen MH, Grace MG. Scanning electron microscopy of normal and vasospastic monkey cerebrovascular smooth muscle cells. Neurosurgery 1991; 29:544-50. [PMID: 1944834 DOI: 10.1097/00006123-199110000-00010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Normal cytoarchitecture of smooth muscle cells of monkey cerebral arteries was studied using scanning electron microscopy after removal of adventitial connective tissue by hydrolysis with HCl. Cerebral arteries were also examined after contraction in vitro with prostaglandin F2 alpha (PGF2 alpha). Anterior cerebral arteries were studied after exposure for 6 days in vivo to whole blood, oxyhemoglobin, methemoglobin, bilirubin, mock cerebrospinal fluid, or supernatant fluid from an incubated mixture of autologous blood and mock cerebrospinal fluid. Normal smooth muscle cells were spindle-shaped and oriented circumferentially around the vessel. They were often grouped into bundles of 5 to 10 cells; bundles were recognizable because cells within them were joined by multiple intercellular contacts. Groups of smooth muscle cells oriented longitudinally were present outside the circular layers of cells. The adventitial surface of muscle cells was smooth apart from fine longitudinal striations in some areas. Arteries contracted with PGF2 alpha had markedly convoluted and folded cell membranes. Muscle cells of vasospastic arteries and of arteries exposed to oxyhemoglobin and supernatant fluid appeared identical to cells contracted with PGF2 alpha. The outer surface of cells of arteries exposed to bilirubin, methemoglobin, and mock cerebrospinal fluid were normal. Marked similarity between vasospastic smooth muscle cells and smooth muscle cells from arteries contracted with PGF2 alpha suggest that smooth muscle contraction occurs during "vasospasm" due to whole blood and to intrathecal injection of oxyhemoglobin.
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Chen MH. Relativistic intermediate-coupling calculations of dielectronic-recombination coefficients for the Li isoelectronic sequence. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1991; 44:4215-4223. [PMID: 9906459 DOI: 10.1103/physreva.44.4215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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244
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Saul JP, Berger RD, Albrecht P, Stein SP, Chen MH, Cohen RJ. Transfer function analysis of the circulation: unique insights into cardiovascular regulation. THE AMERICAN JOURNAL OF PHYSIOLOGY 1991; 261:H1231-45. [PMID: 1928405 DOI: 10.1152/ajpheart.1991.261.4.h1231] [Citation(s) in RCA: 209] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
We have demonstrated previously that transfer function analysis can be used to precisely characterize the respiratory sinus arrhythmia (RSA) in normal humans. To further investigate the role of the autonomic nervous system in RSA and to understand the complex links between respiratory activity and arterial pressure, we determined the transfer functions between respiration, heart rate (HR), and phasic, systolic, diastolic, and pulse arterial pressures in 14 healthy subjects during 6-min periods in which the respiratory rate was controlled in a predetermined but erratic fashion. Pharmacological autonomic blockade with atropine, propranolol, and both, in combination with changes in posture, was used to characterize the sympathetic and vagal contributions to these relationships, as well as to dissect the direct mechanical links between respiration and arterial pressure from the effects of the RSA on arterial pressure. We found that 1) the pure sympathetic (standing + atropine) HR response is characterized by markedly reduced magnitude at frequencies greater than 0.1 Hz and a phase delay, whereas pure vagal (supine + propranolol) modulation of HR is characterized by higher magnitude at all frequencies and no phase delay; 2) both the mechanical links between respiration and arterial pressure and the RSA contribute significantly to the effects of respiration on arterial pressure; 3) the RSA contribution to arterial pressure fluctuations is significant for vagal but not for sympathetic modulation of HR; 4) the mechanical effects of respiration on arterial pressure are related to the negative rate of change of instantaneous lung volume; 5) the mechanical effects have a higher magnitude during systole than during diastole; and 6) the mechanical effects are larger in teh standing than the supine position. Most of these findings can be explained by a simple model of circulatory control based on previously published experimental transfer functions from our laboratory.
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Ma TC, Yu QH, Chen MH. Effects of ginseng stem-leaves saponins on one-way avoidance behavior in rats. ZHONGGUO YAO LI XUE BAO = ACTA PHARMACOLOGICA SINICA 1991; 12:403-6. [PMID: 1819893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Using a multiple-trial, training-to-criterion procedure, the effects of repeated administrations of ginseng stem-leaves saponins (GSLS) on learning and memory of one-way avoidance in rats were studied in shuttle-box. In acquisition, GSLS 10, 30, and 60 mg.kg-1 ip shortened the latency of avoidance in a bell-shaped manner from 1.0 +/- 0.2 s in saline rats to 0.8 +/- 0.5, 0.5 +/- 0.1, 0.8 +/- 0.2 s (d 3 learning) and from 0.9 +/- 0.2 s to 0.8 +/- 0.2, 0.7 +/- 0.1, and 0.8 +/- 0.2 s (10 x 24 h memory), and the best dose was 30 mg.kg-1. GSLS 30 mg.kg-1 ip shortened the latency of avoidance prolonged by scopolamine 0.8 mg.kg-1 sc from 5.2 +/- 1.3 s to 3.9 +/- 0.8 s (d 1 learning acquisition) and from 2.2 +/- 0.6 s to 0.8 +/- 0.3 s (3 x 24 h memory acquisition). In retention, GSLS 30 mg.kg-1 ip shortened the latency prolonged by cycloheximide 2.5 and 5 mg.kg-1 ip from 3.4 +/- 1.0 s to 1.4 +/- 0.5 s (4 h memory) and from 1.6 +/- 0.3 s to 0.9 +/- 0.2 s (24 h memory), and increased the avoidance number decreased by cycloheximide 5 mg.kg-1 from 38.1 +/- 8.8% to 72.4 +/- 10.8% (4 h memory). The results indicate that GSLS facilitated the acquisition of learning and memory in rats, and improved the scopolamine amnesia and cycloheximide amnesia.
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Shih YH, Lee LS, Chen MH, Guo W. Tension pneumocephalus following ventriculoperitoneal shunt: a case report. ZHONGHUA YI XUE ZA ZHI = CHINESE MEDICAL JOURNAL; FREE CHINA ED 1991; 48:224-7. [PMID: 1657341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A case of tension pneumocephalus following suboccipital craniectomy and ventriculoperitoneal (VP) shunt surgery for obstructive hydrocephalus due to the presence of a cerebellopontine (CP) angle tumor is reported. The air entries were found on both sides of the frontal skull base. The formation of the fistula may have been either due to congenital bony defects or chronically elevated intracranial pressure. Iopamidol computed tomographic (CT) cisternogram was one of the diagnostic tools. Direct surgical repair of those bony-dural defects was mandatory in the prevention of the recurrence of the pneumocephalus.
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Chen MH. Auger transition rates and fluorescence yields for the double-K-hole state. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1991; 44:239-242. [PMID: 9905673 DOI: 10.1103/physreva.44.239] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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248
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Beiersdorfer P, Chen MH, Marrs RE, Schneider MB, Walling RS. Dielectronic satellite spectrum of heliumlike vanadium. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1991; 44:396-409. [PMID: 9905694 DOI: 10.1103/physreva.44.396] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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249
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Chen MH, Crasemann B. Resonance enhancement of electron-impact excitation rates for argonlike ions. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1991; 43:5886-5890. [PMID: 9904917 DOI: 10.1103/physreva.43.5886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Chen MH, Bullock R, Graham DI, Miller JD, McCulloch J. Ischemic neuronal damage after acute subdural hematoma in the rat: effects of pretreatment with a glutamate antagonist. J Neurosurg 1991; 74:944-50. [PMID: 2033455 DOI: 10.3171/jns.1991.74.6.0944] [Citation(s) in RCA: 89] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The ability of a competitive N-methyl-D-aspartate (NMDA) receptor antagonist (D-CPP-ene) to reduce irreversible brain damage has been examined in a rodent model of acute subdural hematoma. Acute subdural hematoma was produced by the slow injection of 400 microliters homologous blood into the subdural space overlying the parietal cortex in halothane-anesthetized rats. Brain damage was assessed histologically in sections at multiple coronal planes in animals sacrificed 4 hours after induction of the subdural hematoma. Pretreatment with D-CPP-ene (15 mg/kg) significantly reduced the volume of ischemic brain damage produced by the subdural hematoma from 62 +/- 8 cu mm (mean +/- standard error of the mean) in vehicle-treated control rats to 29 +/- 7 cu mm in drug-treated animals. These data demonstrate the anti-ischemic efficacy of NMDA antagonists in an animal model of intracranial hemorrhage in which intracranial pressure is elevated, and suggest that excitotoxic mechanisms (which are susceptible to antagonism by D-CPP-ene) may play a role in the ischemic brain damage which is observed in patients who die after acute subdural hematoma.
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