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Mandrus D, Sales BC, Keppens V, Chakoumakos BC, Dai P, Boatner LA, Williams RK, Thompson JR, Darling TW, Migliori A, Maple MB, Gajewski DA, Freeman EJ. Filled Skutterudite Antimonides: Validation of the Electron-Crystal Phonon-Glass Approach to New Thermoelectric Materials. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-478-199] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractAfter a brief review of the transport and thermoelectric properties of filled skutterudite antimonides, we present resonant ultrasound, specific heat, and inelastic neutron scattering results that establish the existence of two low-energy vibrational modes in the filled skutterudite LaFe3CoSb12. It is likely that at least one of these modes represents the localized, incoherent vibrations of the La ion in an oversized atomic “cage.” These results support the usefulness of weakly bound, “rattling” ions for the improvement of thermoelectric performance.
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Wang Q, Dai P. Semiparametric model-based inference in the presence of missing responses. Biometrika 2008. [DOI: 10.1093/biomet/asn032] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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53
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Yuan HJ, Han DY, Sun Q, Yan D, Sun HJ, Tao R, Cheng J, Qin W, Angeli S, Ouyang XM, Yang SZ, Feng L, Cao JY, Feng GY, Wang YF, Dai P, Zhai SQ, Yang WY, He L, Liu XZ. Novel mutations in the vWFA2 domain of COCH in two Chinese DFNA9 families. Clin Genet 2008; 73:391-4. [DOI: 10.1111/j.1399-0004.2008.00972.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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54
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Cheng J, Han DY, Dai P, Sun HJ, Tao R, Sun Q, Yan D, Qin W, Wang HY, Ouyang XM, Yang SZ, Cao JY, Feng GY, Du LL, Zhang YZ, Zhai SQ, Yang WY, Liu XZ, He L, Yuan HJ. A novel DFNA5 mutation, IVS8+4 A>G, in the splice donor site of intron 8 causes late-onset non-syndromic hearing loss in a Chinese family. Clin Genet 2007; 72:471-7. [PMID: 17868390 DOI: 10.1111/j.1399-0004.2007.00889.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
We report here the clinical, genetic, and molecular characteristics of a large Chinese family exhibiting non-syndromic, late-onset autosomal dominant sensorineural hearing loss. Clinical evaluation revealed variable phenotypes of hearing loss in terms of severity and age-at-onset of disease in these subjects. Genome-wide linkage analysis mapped the disease gene to the DFNA5 locus with a maximum two-point log odds score of 5.39 at [theta] = 0 for marker D7S2457. DNA sequencing of DFNA5 revealed a novel heterozygous IVS8+4 A>G substitution in the splice donor site of intron 8. Reverse transcriptase-polymerase chain reaction (RT-PCR) showed skipping of exon 8 in the mutant transcript. This mutation faithfully cosegregated with hearing loss in the family. In addition, the mutation was absent in 100 unrelated control DNA samples of Chinese origin. The IVS8+4 A>G mutation is predicted to create a shift in the reading frame and introduce a stop codon at position 372, thereby resulting in a prematurely truncated DFNA5 protein. Up to date, a total of four mutations in DFNA5 have been reported to lead to hearing impairment, all of them result in skipping of exon 8 at the mRNA level. Our findings provide further support for the hypothesis that DFNA5-associated hearing loss is caused by a very specific gain-of-function mutation.
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Campbell BJ, Rosenkranz S, Chupas PJ, Kang HJ, Dai P, Kurita Y, Komiya S, Ando Y. Diffuse scattering study of 2D superstructure in a T' electron-doped cuprate superconductor. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305099071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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56
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Kawano-Furukawa H, Urata M, Nagata T, Yoshizawa H, Kadowaki H, Dai P. Neutron Scattering Study of the Anisotropic Spin Fluctuation in Sr 2 RuO 4. JOURNAL OF NEUTRON RESEARCH 2005. [DOI: 10.1080/10238160412331297818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Dai P, Wong LJC. Somatic instability of the DNA sequences encoding the polymorphic polyglutamine tract of the AIB1 gene. J Med Genet 2004; 40:885-90. [PMID: 14684685 PMCID: PMC1735346 DOI: 10.1136/jmg.40.12.885] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
BACKGROUND AIB1 contains a polymorphic polyglutamine tract (poly Q) that is encoded by a trinucleotide CAG repeat. Previously there have been conflicting results regarding the effect of the poly Q tract length on breast cancer. Since poly Q is not encoded by a perfect CAG repeat, the heterozygous polymorphic alleles need to be resolved, to understand the exact DNA sequences encoding poly Q. METHODS Poly Q encoding sequences of AIB1 from 107 DNA samples, including breast cancer cell lines, sporadic primary breast tumours, and blood samples from BRCA1/BRCA2 mutation carriers and the general population, were resolved by PCR/cloning followed by sequencing of each individual clone. RESULTS 25 distinct poly Q encoding sequence patterns were found. More than two distinct sequence patterns were found in a significantly higher proportion of tumours and cell lines than that of the general population, suggesting somatic instability. A significantly higher proportion of cancer cell lines or primary breast tumours than that of the general population contained rare sequence patterns. The proportion of sporadic breast tumours having at least one allele < or =27 repeats is significantly higher than that in the blood of BRCA1/BRCA2 mutation carrier breast cancer patients or the general population. CONCLUSION The poly Q encoding DNA sequences are somatically unstable in tumour tissues and cell lines. A missense mutation and a very short glutamine repeat in primary tumours suggests that AIB1 activity may be modulated through poly Q, which in turn plays a role in the cotransactivation of gene expressions in breast cancers.
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Jin R, Onose Y, Tokura Y, Mandrus D, Dai P, Sales BC. In-plane thermal conductivity of Nd2CuO4: evidence for magnon heat transport. PHYSICAL REVIEW LETTERS 2003; 91:146601. [PMID: 14611542 DOI: 10.1103/physrevlett.91.146601] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2003] [Indexed: 05/24/2023]
Abstract
We report the temperature and magnetic field dependence of the in-plane thermal conductivity (kappa(ab)) of high-quality monocrystalline Nd2CuO4. Isothermal measurements of the field dependence of kappa(ab) at low temperatures (2 K<or=T<or=5 K) show no change in kappa(ab) below a critical magnetic field H(c) (H(c) approximately 4.5 T for H parallel [100]) and H(c) approximately 2.5 T for H approximately parallel [110]). Above H(c), kappa(ab) more than doubles as H is increased to 9 T. At H(c), there is a transition from a noncollinear to a collinear arrangement of the Nd and Cu spins and a collapse of the gap, Delta, in an acoustic magnon branch at k=0. Closure of this gap appears to allow the conduction of substantial amounts of heat by acoustic magnons.
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Zhao H, Huang D, Han D, Han W, Dai P. [Rat hearing loss and hearing organs mitochondrial DNA4834 deletions associated with hypercholesteremia]. ZHONGHUA ER BI YAN HOU KE ZA ZHI 2001; 36:422-5. [PMID: 12761955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
Abstract
OBJECTIVE To determine whether or not the rat hypercholesteremia contributes to hearing organs mtDNA4834 deletion and involves in the development of hearing loss. METHODS The rat hypercholesteremia model (n = 38) was established by feeding with high cholesterol diet and the control group (n = 22) with common diet for 6 months. The rats were tested for auditory sensitivity using auditory brainstem response (ABR). Twenty-one left cochleae and 27 left cochlear nuclei from experimental group and 10 left cochleae and 13 left cochlear nuclei from control group were harvested. The total DNA of them was extracted. mtDNA was amplified by nest PCR to examine the presence of mtDNA4834 deletion. RESULTS Our result showed: (1) There is a significant increase in serum cholesterol level and ABR threshold in the experimental group. (2) The mitochondrially-encoded tRNA and ND1 segments were amplified from all samples, as well as mtDNA4834 deletions. (3) The incidence of mtDNA4834 deletions in hearing organs of hypercholesteremia rats was significantly higher than that of the control group (P < 0.05). CONCLUSION Extended hypercholesteremia can induce hearing loss, and mtDNA4834 deletion in hearing organs may be one of the pathogenic mechanisms.
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Wong LJ, Chen TJ, Dai P, Bird L, Muenke M. Novel SNP at the common primer site of exon IIIa of FGFR2 gene causes error in molecular diagnosis of craniosynostosis syndrome. AMERICAN JOURNAL OF MEDICAL GENETICS 2001; 102:282-5. [PMID: 11484208 DOI: 10.1002/ajmg.1461] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Most mutations in Crouzon, Pfeiffer, and Apert syndromes are in the extracellular, third immunoglobulin-like domain and adjacent linker regions (exons IIIa and IIIc) of the fibroblast growth factor receptor 2 (FGFR2) gene. Using the published primers for PCR, a patient with Crouzon syndrome was found to be homozygous for a mutation that results in a Q289P amino acid substitution in FGFR2. Two additional patients; one with Apert syndrome and P253R mutation, the other with Pfeiffer syndrome and S267P mutation, also appeared to be homozygous. Using a new primer located 146 bp 5' of exon IIIa for PCR followed by sequencing revealed an A to G polymorphism at -62 [corrected] position of exon IIIa. All three patients were heterozygous for both the mutation and the polymorphism. These results indicate that the polymorphism and the mutation are not on the same chromosome. The single nucleotide polymorphism is located at the second to the last base of the 3' end of the published primer. This primer mismatch caused the failure of amplification of the normal chromosome and thus, the apparent homozygosity. The frequency of this novel polymorphism was determined to be 0.03 by studying 326 chromosomes from the general population. We propose that a new primer should be used for mutational analysis of exon IIIa of FGFR2 to avoid misdiagnosis caused by primer mismatch.
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Wong LJ, Dai P, Tan D, Lipson M, Grix A, Sifry-Platt M, Gropman A, Chen TJ. Severe lactic acidosis caused by a novel frame-shift mutation in mitochondrial-encoded cytochrome c oxidase subunit II. AMERICAN JOURNAL OF MEDICAL GENETICS 2001; 102:95-9. [PMID: 11471180 DOI: 10.1002/1096-8628(20010722)102:1<95::aid-ajmg1412>3.0.co;2-u] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We report the first frame-shift truncation mutation in a mitochondrial DNA (mtDNA)-encoded subunit II of cytochrome c oxidase (COXII). The mutation was identified by temporal temperature gradient gel electrophoresis (TTGE) followed by direct DNA sequencing in an infant who died at 12 days of age following a course of apnea, bradycardia, and severe lactic acidosis. The patient had a twin brother who died at two days of age of similar course. The mutation, 8042delAT, produced a truncated protein that was 72 amino acids shorter than the wild type protein. The mutant protein, missing one third of the amino acid residues at the C-terminal essential for hydrophilic interaction with cytochrome c, ligand binding to CuA and Mg, and the formation of proton and water channels, apparently has devastating effects on mitochondrial respiratory function.
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Zhang J, Dai P, Fernandez-Baca JA, Plummer EW, Tomioka Y, Tokura Y. Jahn-Teller phonon anomaly and dynamic phase fluctuations in La0.7Ca0.3MnO3. PHYSICAL REVIEW LETTERS 2001; 86:3823-3826. [PMID: 11329333 DOI: 10.1103/physrevlett.86.3823] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2000] [Indexed: 05/23/2023]
Abstract
Inelastic neutron scattering was used to study the temperature (T) dependence of the lattice excitations in La 0.7Ca 0.3MnO (3). An optical Jahn-Teller phonon exhibits continuous but anomalous damping with increasing temperature in the ferromagnetic-metallic phase and collapses above the Curie temperature T(C) (240 K). We attribute this anomaly to the growing dynamic phase segregation as T-->T(C), thus providing evidence of local fluctuations associated with the short-range polaron or charge/orbital ordering in the ferromagnetic-metallic state.
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Wong LJ, Hwu WL, Dai P, Chen TJ. Molecular genetics of glycogen-storage disease type 1a in Chinese patients of Taiwan. Mol Genet Metab 2001; 72:175-80. [PMID: 11161844 DOI: 10.1006/mgme.2000.3129] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The mutation spectrum of the glucose 6-phosphatase (G6Pase) gene in Chinese patients with type 1a glycogen-storage disease of Taiwan was studied by PCR/RFLP, temporal temperature gradient gel electrophoresis, and direct DNA sequencing methods. In addition to the two most prevalent mutations, 727G --> T (44.4%) and R83H (36.1%), that were detected by RFLP analysis, five other mutations, 341delG, 933insAA, Q104X, I341N, and H119L were identified. The frameshift mutations (341delG and 933insAA) and the nonsense mutation (Q104X) that produce truncated proteins are predicted to be disease-causing. The missense mutation, I341N, occurring in the last transmembrane domain of the ER-bound enzyme, retains a small amount of residual activity of approximately 10%. Except for R83H, the mutations have been described only in Asians. H119L, however, is of particular interest because of the essential role of the catalytic histidine of phosphohydrolase. This amino acid is believed to be involved in the formation of the phosphoryl-enzyme intermediate during catalysis. The patient who was compound heterozygous for 727G --> T and H119L mutations had essentially no G6Pase activity in her liver biopsy. This observation is consistent with the importance of H119L in catalysis.
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Hedge VR, Puar MS, Dai P, Pu H, Patel M, Anthes JC, Richard C, Terracciano J, Das PR, Gullo V. A family of depsi-peptide fungal metabolites, as selective and competitive human tachykinin receptor (NK2) antagonists: fermentation, isolation, physico-chemical properties, and biological activity. J Antibiot (Tokyo) 2001; 54:125-35. [PMID: 11302484 DOI: 10.7164/antibiotics.54.125] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Four tachykinin (NK2) receptor inhibitors, SCH 378161 (1), SCH 217048 (2), SCH 378199 (3), and SCH 378167 (4) were isolated from the fermentation broth of a taxonomically unidentified fungus. These compounds were separated from the fermentation broth by ethyl acetate extraction. Purification and separation of the individual compounds were achieved by NK2 assay-guided fractionation using gel filtration, reverse phase chromatography and HPLC. They were identified to be a family of depsipeptides by spectroscopic and degradation studies. Compounds 1 and 3 contain proline and differ as an amide and acid whereas 2 and 4 contain pipecolic acid and differ in being an amide and acid. All of these compounds contain an identical hydroxy acid. They are selective NK2 inhibitors with Ki values ranging from 27-982 nM and demonstrate no activity at 10 microM in the NK1 and NK3 assays. In addition, compounds 1 and 2 inhibited NKA-induced increases in the concentration of intracellular Ca2+, [Ca2+]i, in a CHO cell expressing the human NK2 receptor; this inhibition was competitive in nature with pA2 values of 7.2 and 7.5, respectively. These data demonstrate that these natural products are selective and competitive receptor antagonists of the human NK2 receptor.
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Dai P, Jiang S, Gu R. [Cochlear hypoxia and mtDNA deletion: possible correlated factors to cause presbycusis]. ZHONGHUA YI XUE ZA ZHI 2000; 80:897-900. [PMID: 11236628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
OBJECTIVE To find the relationship among the most common mitochondrial DNA (mtDNA) 4,977 bp deletion, aging and deterioration of acoustic organ and determine the pathologic factors causing mtDNA 4,977 bp deletion. METHODS Sixty-seven temporal bones from a presbycusis group, an age-matched control group and a young control group were evaluated. The nested PCR and tri-nested PCR techniques were used to test the presence of mtDNA 4,977 deletion. Computer imaging processing was used to measure the parameters of blood vessels in the internal acoustic meatus. RESULTS Temporal bones from patients aged 50 years or over frequently showed mtDNA 4,977 deletions. In presbycusis patients, 17 of 34 ears showed mtDNA 4,977 deletion, whereas only 4 of 19 ears from the age-matched control group showed mtDNA 4,977 deletions. mtDNA 4,977 deletions were often seen in the spiral ganglion and vestibular ganglion neurons. In the presbycusis group, the lumen of the vasa nervosum of the internal auditory meatus showed a more severe reduction in patients with mtDNA 4,977 deletion than in those without deletion. CONCLUSION There is a strong correlation between presbycusis and mtDNA 4,977 deletion. We hypothesize that cochlear hypoxia may cause mtDNA 4,977 deletions and other mtDNA mutants which in turn may cause a reduction of mitochondrial oxidative phosphorylation and decreased auditory nerve function. The symptoms of neural presbycusis, however, may appear only after mtDNA metabolism decreases below a specific threshold.
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Jin H, Zhang S, Dai P, Xie M, Liu Y. [A comprehensive evaluation on psychological quality among automobile drivers]. ZHONGHUA LIU XING BING XUE ZA ZHI = ZHONGHUA LIUXINGBINGXUE ZAZHI 2000; 21:369-71. [PMID: 11860820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To study the comprehensive evaluation on the indexes of psychological quality on automobile drivers. METHODS A index system, consisted of seven psychological indexes (including relevant physiological indexes), was developed through Delphi method and mathematical statistics. Basic data of the seven psychological and physiological indexes including mean, standard deviation and percentile, were taken from more than 8,000 occupational licensed automobile drivers and more than 6,000 trainees who were randomly sampled from 5 cities across China. The weight coefficients of indexes were determined by analytical hierarchy process (AHP). RESULTS Comprehensive evaluation equations of the occupational automobile drivers and the trainees were established respectively. The critical values of evaluation were divided into grades by the percentiles of evaluated values. Verified results showed that there was significant difference of the values under evaluation between drivers who had accidents and who did not (t = 14.68, P < 0.01; H = 73.61, P < 0.001). The test of consistence showed that the consistence was quite good (rate of consistence = 92.99%; kappa = 0.85). CONCLUSION Results showed that the comprehensive equations for evaluation were reasonable and feasible for detecting the potential accident-proneness drivers.
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Dai P, Fernandez-Baca JA, Wakabayashi N, Plummer EW, Tomioka Y, Tokura Y. Short-range polaron correlations in the ferromagnetic La1-xCaxMnO3. PHYSICAL REVIEW LETTERS 2000; 85:2553-2556. [PMID: 10978105 DOI: 10.1103/physrevlett.85.2553] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2000] [Indexed: 05/23/2023]
Abstract
We use neutron scattering to demonstrate the presence of lattice polarons and their short-range correlations for several samples of La1-xCaxMnO3 in the Ca doping range 0.15</=x</=0.3. We establish the doping dependence of the orientation, commensuration, and coherence length of the polaron correlations and show that the populations of correlated and uncorrelated polarons are intimately related to the transport properties of the materials.
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Bao W, McQueeney RJ, Heffner R, Sarrao JL, Dai P, Zarestky JL. Commensurate dynamic magnetic correlations in La2Cu0.9Li0.1O4. PHYSICAL REVIEW LETTERS 2000; 84:3978-3981. [PMID: 11019254 DOI: 10.1103/physrevlett.84.3978] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/1999] [Indexed: 05/23/2023]
Abstract
When sufficient numbers of holes are introduced into the two-dimensional CuO2 square lattice, dynamic magnetic correlations become incommensurate with underlying lattice in all previously investigated La(2-x)A(x)Cu(1-z)B(z)O(4+y) ( A = Sr or Nd, B = Zn) including high T(c) superconductors and insulators, and in bilayered superconducting YBa2Cu3O6.6 and Bi2Sr2CaCu2O8. Magnetic correlations also become incommensurate in structurally related La2NiO4 when doped with Sr or O. We report an exception to this so-far well-established experimental "rule" in La(2)Cu(1-z)Li(z)O4 in which magnetic correlations remain commensurate.
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Tao H, Ma Z, Dai P, Jiang L. Computer-aided 3-D reconstruction and measurement of the optic canal and intracanalicular structures. Chin Med J (Engl) 2000; 113:140-3. [PMID: 11775538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023] Open
Abstract
OBJECTIVE To reconstruct the human optic canal and its inner structures, and to provide detailed knowledge of this region for optic nerve decompression for further understanding on the pathologic mechanisms of indirect optic nerve injury. METHODS Six optic canals and their inner structures were reconstructed using a computer-aided 3-dimensional reconstruction system. Quantitative measurement of the canal wall thickness, bony canal transverse area, optic nerve transverse area, dural sheath transverse area, subarachnoid space transverse area, and subarachnoid space volume were done by means of the computer morphometric analysis system. The detailed spatial relationship among intracanalicular structures were also carefully identified on the 3-D models. RESULTS The thinnest portion of the canal was the middle part of the medial wall (0.45 +/- 0.35 mm) and the narrowest space was in the middle part of the optic canal (the transverse area was 18.21 +/- 2.50 mm2). The volume of subarachnoid space which can be considered the compensatory space for distention incurred by the hemorrhage, optic nerve edema, or hematoma was 21.16 +/- 4.31 mm3. At the cranial opening, the middle part and orbital opening, its transverse area was 4.45 +/- 1.12 mm2, 2.68 +/- 1.32 mm2 and 1.23 +/- 0.83 mm2, respectively. CONCLUSIONS Since the compensatory space was limited, even a tiny amount of blood or swelling of the nerve may cause optic nerve compression. Because the narrowest space was in the middle part of the optic canal and the compensatory space for distention gradually decreases from cranial end to orbital end, the middle part and the anterior part of the optic canal and dural sheath are critical in optic nerve decompression.
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Takahashi T, Suwabe N, Dai P, Yamamoto M, Ishii S, Nakano T. Inhibitory interaction of c-Myb and GATA-1 via transcriptional co-activator CBP. Oncogene 2000; 19:134-40. [PMID: 10644988 DOI: 10.1038/sj.onc.1203228] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Gene targeting experiments have revealed that transcription factors such as c-Myb and GATA-1 play crucial roles during hematopoietic differentiation. c-Myb is necessary in the immature cells of almost every hematopoietic lineage and GATA-1 is essential for the development of the erythroid lineage. In addition, CREB-binding protein (CBP) acts as a transcriptional adapter for various transcription factors, including c-Myb and GATA-1. In this paper, we show that the transcription factors c-Myb and GATA-1 each inhibit the transcriptional activity of the other and that any possible bipartite complexes c-Myb, GATA-1, and CBP could be formed, but the tripartite complex was hardly formed. The exclusive binding of GATA-1 and c-Myb to CBP is probably the molecular basis for the mutual inhibition of their transcriptional activity. Our data suggest that cross-talk between these three factors might be important for hematopoietic differentiation and that CBP functions as a key molecule during the process.
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Tao H, Ma Z, Dai P, Jiang L. [Computer-aided 3-D reconstruction and measurement of optic canal and intracanalicular structures]. [ZHONGHUA YAN KE ZA ZHI] CHINESE JOURNAL OF OPHTHALMOLOGY 1999; 35:426-9, 25. [PMID: 11835852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To reconstruct the human optic canal and its inner structures, and to provide knowledge of this region in detail for optic nerve decompression and further understanding on the pathologic mechanisms of indirect optic nerve injury. METHODS 6 optic canals and its inner structures were reconstructed by using a computer-aided 3-dimensional (3-D) reconstruction system. Quantitative measurement for the canal wall thickness, bony canal transverse area, optic nerve transverse area, dual sheath transverse area, subarachnoid space transverse area, and subarachnoid space volume were done by means of the computer morphometric analysis system. The detailed spatial relations among intracanalicular structures were also carefully identified on the 3-D models. RESULTS The thinnest portion of the canal was the middle part of the medial wall (0.45 +/- 0.35)mm, and the narrowest space was in the middle part of the optic canal [the transverse area was (18.21 +/- 2.50) mm(2)]. The volume of subarachnoid space which can be considered the compensatory space for distention incurred by the hemorrhage, optic nerve edema, or hematoma was (21.16 +/- 4.31) mm(3). At the cranial opening, the middle part and orbital opening, its transverse area was (4.45 +/- 1.12) mm(2), (2.68 +/- 1.32) mm(2), (1.23 +/- 0.83) mm(2), respectively. CONCLUSIONS In the middle part, the restraining of the bony canal on injured nerve may be the most powerful. Since the compensatory space was limited, even a tiny amount of blood or swelling of the nerve may cause optic compression. Because the compensatory space for distention gradually decreases from cranial end to orbital end, the middle part and the anterior part of the optic canal and dural sheath are critical in optic nerve decompression.
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Tao H, Ma Z, Dai P, Jiang L. Computer-aided three-dimensional reconstruction and measurement of the optic canal and intracanalicular structures. Laryngoscope 1999; 109:1499-502. [PMID: 10499062 DOI: 10.1097/00005537-199909000-00026] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE To reconstruct the human optic canal and its inner structures and to provide detailed knowledge of this region for optic nerve decompression. METHODS Six optic canals and their inner structures were reconstructed using a computer-aided three-dimensional reconstruction system. Quantitative measurement of the canal wall thickness, bony canal transverse area, optic nerve transverse area, dural sheath transverse area, subarachnoid space transverse area, and subarachnoid space volume was done using the computer morphometric analysis system. The detailed spatial relationship among intracanalicular structures was also carefully identified on the three-dimensional models. RESULTS The thinnest portion of the canal was the middle part of the medial wall (0.45 +/- 0.14 mm) and the narrowest space was in the middle part of the optic canal (the transverse area was 18.21 +/- 1.20 mm2). The volume of subarachnoid space that can be considered the compensatory space for distention incurred by the hemorrhage, optic nerve edema, or hematoma was 21.16 +/- 4.31 mm3. At the cranial opening, the middle part, and the orbital opening, its transverse area was 4.45 +/- 0.46 mm2, 2.68 +/- 0.54 mm2, and 1.23 +/- 0.34 mm2 respectively. CONCLUSIONS Because the compensatory space was limited, even a tiny amount of blood or swelling of the nerve may cause optic nerve compression. Because the compensatory space for distention gradually decreases from cranial end to orbital end, the middle part and the anterior part of the optic canal and dural sheath are critical in optic nerve decompression.
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Yuan H, Jiang S, Yang W, Guo W, Cao J, Dai P. [Screening for mitochondrial 1555(G) mutation in patients with aminoglycoside antibiotic-induced deafness]. ZHONGHUA YI XUE YI CHUAN XUE ZA ZHI = ZHONGHUA YIXUE YICHUANXUE ZAZHI = CHINESE JOURNAL OF MEDICAL GENETICS 1999; 16:141-4. [PMID: 10359861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
OBJECTIVE To identify the incidence of the 1555(G) mutation in pedigrees and sporadic patients with aminoglycoside antibiotic- induced deafness so as, to privide the theoretical evidence for establishing the method of diagnosis of this disease. METHODS Blood samples were obtained from two pedigrees and seven sporadic patients with aminoglycoside antibiotic-induced deafness, and five mothers of the sporadic patients. DNA was extracted from the isolated leukocytes. The mitochondrial DNA fragments were amplified by PCR; 1555(G) mutation was detected by Alw26 I restriction endonuclease digestion. RESULTS Fourteen individuals from two pedigrees carried homoplasmic 1555(G) mutation. Seven sporadic patients and the five mothers did not have 1555(G) mutation. CONCLUSION The incidence of the 1555(G) mutation in pedigrees with aminoglycoside antibiotic-induced deafness is fairly high, while in sporadic patients is low. Screening for mitochondrial 1555(G) mutation is of potential value to clinical use.
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Dai P, Mook HA, Hayden SM, Aeppli G, Perring TG, Hunt RD, Dogan F. The magnetic excitation spectrum and thermodynamics of high-Tc superconductors. Science 1999; 284:1344-7. [PMID: 10334986 DOI: 10.1126/science.284.5418.1344] [Citation(s) in RCA: 244] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Inelastic neutron scattering was used to study the wave vector- and frequency-dependent magnetic fluctuations in single crystals of superconducting YBa2Cu3O6+x. The spectra contain several important features, including a gap in the superconducting state, a pseudogap in the normal state, and the much-discussed resonance peak. The appearance of the pseudogap determined from transport and nuclear resonance coincides with formation of the resonance in the magnetic excitations. The exchange energy associated with the resonance has the temperature and doping dependences as well as the magnitude to describe approximately the electronic specific heat near the superconducting transition temperature (Tc).
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75
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Dai P, Akimaru H, Tanaka Y, Maekawa T, Nakafuku M, Ishii S. Sonic Hedgehog-induced activation of the Gli1 promoter is mediated by GLI3. J Biol Chem 1999; 274:8143-52. [PMID: 10075717 DOI: 10.1074/jbc.274.12.8143] [Citation(s) in RCA: 415] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Drosophila transcription factor cubitus interruptus (Ci) and its co-activator CRE (cAMP response element)-binding protein (CBP) activate a group of target genes on the anterior-posterior border in response to hedgehog protein (Hh) signaling. In the anterior region, in contrast, the carboxyl-truncated form of Ci generated by protein processing represses Hh expression. In vertebrates, three Ci-related transcription factors (glioblastoma gene products (GLIs) 1, 2, and 3) were identified, but their functional difference in Hh signal transduction is unknown. Here, we report distinct roles for GLI1 and GLI3 in Sonic hedgehog (Shh) signaling. GLI3 containing both repression and activation domains acts both as an activator and a repressor, as does Ci, whereas GLI1 contains only the activation domain. Consistent with this, GLI3, but not GLI1, is processed to generate the repressor form. Transcriptional co-activator CBP binds to GLI3, but not to GLI1. The trans-activating capacity of GLI3 is positively and negatively regulated by Shh and cAMP-dependent protein kinase, respectively, through a specific region of GLI3, which contains the CBP-binding domain and the phosphorylation sites of cAMP-dependent protein kinase. GLI3 directly binds to the Gli1 promoter and induces Gli1 transcription in response to Shh. Thus, GLI3 may act as a mediator of Shh signaling in the activation of the target gene Gli1.
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76
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Hegde VR, Puar MS, Chan TM, Dai P, Das PR, Patel M. Sch 217048: A Novel Cyclodepsipeptide with Neurokinin Antagonist Activity. J Org Chem 1998. [DOI: 10.1021/jo981467j] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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77
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Sano Y, Tokitou F, Dai P, Maekawa T, Yamamoto T, Ishii S. CBP alleviates the intramolecular inhibition of ATF-2 function. J Biol Chem 1998; 273:29098-105. [PMID: 9786917 DOI: 10.1074/jbc.273.44.29098] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The transcription factor ATF-2 (also called CRE-BP1), whose DNA-binding domain consists of a basic amino acid cluster and a leucine zipper (b-ZIP) region, binds to the cAMP response element as a homodimer or as a heterodimer with c-Jun. The amino-terminal region of ATF-2 containing the transcriptional activation domain is phosphorylated by stress-activated kinases, which leads to activation of ATF-2. We report here that CBP, which was originally identified as a co-activator of CREB, directly binds to the b-ZIP region of ATF-2 via a Cys/His-rich region termed C/H2, and potentiates trans-activation by ATF-2. The b-ZIP region of ATF-2 was previously shown to interact with the amino-terminal region intramolecularly and to inhibit trans-activating capacity. The binding of CBP to the b-ZIP region abrogates this intramolecular interaction. The adenovirus 13S E1A protein which binds to the b-ZIP region of ATF-2 also inhibited this intramolecular interaction, suggesting that both CBP and 13S E1A share a similar function as positive regulators of ATF-2. We found that the b-ZIP regions of c-Jun and CREB also interact with the C/H2 domain of CBP, suggesting that CBP acts as a regulator for a group of b-ZIP-containing proteins. These results shed light on a novel aspect of CBP function as a regulator for a group of b-ZIP-containing proteins.
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78
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Dai P, Jiang S, Yang W. [Extraction, amplification, recombination and sequencing of the mitochondrial DNA from celloidin embedded human temporal bone sections]. ZHONGHUA ER BI YAN HOU KE ZA ZHI 1998; 33:206-9. [PMID: 11717883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/17/2023]
Abstract
OBJECTIVE To establish an analytical method of DNA extracted from human celloidin-embedded temporal bone sections by molecular biologic technique. METHODS Polymerase chain reaction (PCR) with different primers, special amplification methods or coorperated with enzyme restricted reactions was adapted to detect several types of genetic mutations from 9 human celloidin-embedded temporal bone sections. The pGEM-T vector was used for the recombination and cloning of the amplified DNA fragment. RESULTS The 135 bp fragments of normal mtDNA were detected from all of the 9 cases. The 316bp fragment related to mtDNA 4977bp deletion was also detected in two cases who suffered from presbycusis before death by the nested PCR. The result of sequencing confirmed the accuracy of PCR. CONCLUSION The application of molecular biologic techniques in temporal bone research is important in improving the quality and value of retrospective study of ear diseases and has resulted in findings of the relevant mutant or pathogenetic genes in the ear diseases such as presbycusis, ototoxic deafness, otosclerosis and viral infections of the ear.
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Hegde VR, Dai P, Patel M, Das PR, Wang S, Puar MS. A depsipeptide fungal metabolite inhibitor of cholesteryl ester transfer protein. Bioorg Med Chem Lett 1998; 8:1277-80. [PMID: 9871749 DOI: 10.1016/s0960-894x(98)00224-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The organic extract of the fermentation broth of a fungus was found to contain a depsipeptide SCH 58149 (1), containing three amino acids and a beta-hydroxy acid, by spectroscopic studies. The amino acids were phenyl alanine, alanine and leucine and the beta-hydroxy acid is 3-hydroxy-4-methyl octanoic acid. SCH 58149 exhibited weak activity against cholesterol ester transfer protein (CETP) with an IC50 of 50 microM.
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80
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Guan G, Dai P, Shechter I. Differential transcriptional regulation of the human squalene synthase gene by sterol regulatory element-binding proteins (SREBP) 1a and 2 and involvement of 5' DNA sequence elements in the regulation. J Biol Chem 1998; 273:12526-35. [PMID: 9575211 DOI: 10.1074/jbc.273.20.12526] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Transcription of the human squalene synthase (HSS) gene is regulated by variations in the level of cellular cholesterol. Three regulatory elements in the HSS promoter region are known to be involved in the regulation: 1) a modified sterol regulatory element (SRE) 1 (HSS-SRE-1), 2) an inverted SRE-3 (Inv-SRE-3), 3) an inverted Y box (Inv-Y-Box). We report here the regulatory role of distinct cis-elements in the HSS promoter by using mutants of an HSS-luciferase promoter reporter. The activity of a wild-type promoter reporter transiently transfected into HepG-2 cells is increased by sterol depletion of the cells or by coexpression of mature forms of the SRE-binding proteins (SREBP) 1a and SREBP-2. Differential activation by SREBP-1a and SREBP-2 of the reporter gene mutated at various regions of the promoter is observed. Mutation of either the HSS-SRE-1 or the Inv-SRE-3 sequence diminished the activation by SREBP-1a and by sterol depletion but did not affect the activation by SREBP-2. Simultaneous mutations of both of these sequences almost completely abolished activation of the promoter by SREBP-1a or by sterol depletion, but activation by SREBP-2 was retained at 70%. Mutation of the Inv-Y-Box sequence element decreased the activity of the promoter by 50% or more, and if mutated together with both SREs, the activation was almost completely abolished. Mutation of any single GC box of the two located at -40 to -57 did not affect activity, whereas simultaneous mutation of the two decreased activation by SREBP-2 by 60%, by lipid depletion by 20%, and had no effect on the activation by SREBP-1a. A Y box motif at -159 to -166 and an SRE-like sequence element (SRE-1(8/10)) at position -101 to -108 are also involved in the sterol regulation. These results indicate that the complex sterol-mediated transcriptional regulation of the HSS gene is due to the presence of multiple copies of diverse cis elements in the HSS promoter. The differential activation of the HSS promoter may point to specific role of the SREBPs in cholesterogenesis.
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81
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Dai P, Zheng Z, Sun S. [Blood supply reestablishment of avascular necrosis of femoral head with digital subtraction angiography]. ZHONGHUA YI XUE ZA ZHI 1998; 78:195-7. [PMID: 10923528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
OBJECTIVE To use digital subtraction angiography (DSA) to evaluate blood supply reestablishment after the treatment of the avascular necrosis of femoral head (ANFH) by using the vascularized iliac periosteum with deep iliac circumflex artery (DICA) and vein pedicle. METHODS Seldinger method was used to puncture femoral artery interpate of 20 patients with pre and postoperative ANFH. 6.5 F Cobrn conduct was optionally used and put directly into DICA and then contrast medium, was injected for observation of blood vessel. RESULTS Before operation, the position of DICA was found constant, 3 to 7 branches termity among the crest part of iliac bone. Three weekes after operation, DICA was found wider than that before operation, but the blood flow speed remained almost the same and its termity was distributed evenly inside the femoral head and looked like a bird's net. Three months after operation, the blood vessel was still wider, but blood flowed faster and its termity changed roundish, and the bird's net changed greatly and capillaries reached the subchoronal zone of femoral head. CONCLUSION Blood flow was well reestablished after the treatment of ANFH by DSA. It can be easily checked with less damage, large liability, and clear picture.
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Hegde VR, Dai P, Chu M, Patel M, Bryant R, Terracciano J, Das PR, Puar MS. Neurokinin receptor inhibitors: fermentation, isolation, physico-chemical properties, structure and biological activity. J Antibiot (Tokyo) 1997; 50:983-91. [PMID: 9510903 DOI: 10.7164/antibiotics.50.983] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Seven neurokinin (NK) receptor inhibitors SCH 60059 (1), SCH 60065 (2), SCH 64879 (3), SCH 60061 (4), SCH 60063 (5), SCH 60057 (7), and SCH 64878 (9) and two uncharacterized components 6 and 8, were isolated from the fermentation broth of a fungus taxonomically classified as an Acremonium sp. These compounds were isolated from the fermentation broth by ethyl acetate extraction. Purification and separation of the individual compounds were achieved by NK1 and NK2 assay-guided fractionation using gel filtration, reverse phase chromatography and HPLC. The NK active compounds were identified to be a family of polyhydroxy isoprenoid derivatives, including glycosylated members, by spectroscopic and degradation studies. Compounds 1 approximately 5 and 7 contain nine isoprene units connected in head to tail fashion and compound 9 contains fifteen isoprene units connected in a similar manner. All these compounds showed dual inhibition in NK1 and NK2 assays with IC50 values ranging from 2.5 approximately 11 microM in the NK1 assay and 6.8 approximately 16 microM in the NK2 assay.
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83
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Herwig KW, Wu Z, Dai P, Taub H, Hansen FY. Quasielastic neutron scattering and molecular dynamics simulation studies of the melting transition in butane and hexane monolayers adsorbed on graphite. J Chem Phys 1997. [DOI: 10.1063/1.474881] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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84
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Jiang S, Dai P, Liu Y. [3-D morphological study of the temporal bone]. ZHONGHUA YI XUE ZA ZHI 1997; 77:579-82. [PMID: 9772461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
OBJECTIVE To establish the 3-D(three-dimensional) morphological study of the temporal bone by means of computer graphic techniques. METHODS The serial sections of the temporal bone were processed by the technique of computer-aided 3-D reconstruction. The 3-D images of the multi-structures in the temporal bone were displayed on the monitor. The 3-D parameters of these structures were measured by a special software. The stereo-images of the structures in the temporal bone were obtained by stereoscopy and stereo-pairs. RESULTS Most structures of the temporal bone were reconstructed in 37 instances for the different purpose of study. Each set of the stereo-pair corresponding to the structures in the temporal bones and many 3-D parameters were obtained. The complex spatial relationship among the reconstructed structures such as the facial nerve, endolymphatic sac, posterior tympanum and posterior ampullary nerve was revealed and the mechanic model of the ossicular chain was set up. According to these results, the surgical approach of the posterior ampullary nerve transection was designed and simulated on the graphic computer. CONCLUSION The technique of computer-aided 3-D reconstruction provides a new tool for the study of the temporal bone. It is also helpful for the designs and simulations of the surgical approaches. The results of this study contribute to developmout of a new branch of pathology of the temporal bone and a primary 3-D morphological study of the temporal bone.
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Akimaru H, Chen Y, Dai P, Hou DX, Nonaka M, Smolik SM, Armstrong S, Goodman RH, Ishii S. Drosophila CBP is a co-activator of cubitus interruptus in hedgehog signalling. Nature 1997; 386:735-8. [PMID: 9109493 DOI: 10.1038/386735a0] [Citation(s) in RCA: 217] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The transcription factor CBP, originally identified as a coactivator for CREB, enhances transcription mediated by many other transcription factors. Mutations in the human CBP gene are associated with Rubinstein-Taybi syndrome, a haploinsufficiency disorder characterized by abnormal pattern formation, but the mechanism by which decreased CBP levels affect pattern formation is unclear. The hedgehog (hh) signalling pathway is an important determinant of pattern formation. cubitus interruptus (ci), a component in hh signalling, encodes a transcription factor homologous to the Gli family of proteins and is required for induction of the hh-dependent expression of patched (ptc), decapentaplegic (dpp) and wingless (wg). Haploinsufficiency for the ci-related transcription factor Gli3 causes phenotypic changes in mice (known as 'extra-toes) and humans (Greig's cephalopolysyndactyly syndrome) that have similarities to Rubinstein-Taybi syndrome. Here we show that Drosophila CBP (dCBP) functions as a coactivator of Ci, suggesting that the dCBP-Ci interaction may shed light on the contribution of CBP to pattern formation in mammals.
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Dai P, Yethiraj M, Mook HA, Lindemer TB, Dogan F. Magnetic Dynamics in Underdoped YBa2Cu3O7-x: Direct Observation of a Superconducting Gap. PHYSICAL REVIEW LETTERS 1996; 77:5425-5428. [PMID: 10062800 DOI: 10.1103/physrevlett.77.5425] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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87
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Dai P, Zhang J, Mook HA, Liou S, Dowben PA, Plummer EW. Experimental evidence for the dynamic Jahn-Teller effect in La0.65Ca0.35MnO3. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:R3694-R3697. [PMID: 9986349 DOI: 10.1103/physrevb.54.r3694] [Citation(s) in RCA: 97] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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88
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Mook HA, Dai P, Salama K, Lee D, Dogan F, Aeppli G, Boothroyd AT, Mostoller ME. Incommensurate One-Dimensional Fluctuations in YBa2 Cu3O6.93. PHYSICAL REVIEW LETTERS 1996; 77:370-373. [PMID: 10062434 DOI: 10.1103/physrevlett.77.370] [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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89
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Friedman JR, Zhang Y, Dai P, Sarachik MP. Magnetic-field-induced crossover from Mott variable-range hopping to weakly insulating behavior. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:9528-9531. [PMID: 9982491 DOI: 10.1103/physrevb.53.9528] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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90
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Dai P, Akimaru H, Tanaka Y, Hou DX, Yasukawa T, Kanei-Ishii C, Takahashi T, Ishii S. CBP as a transcriptional coactivator of c-Myb. Genes Dev 1996; 10:528-40. [PMID: 8598284 DOI: 10.1101/gad.10.5.528] [Citation(s) in RCA: 299] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
CBP (CREB-binding protein) is a transcriptional coactivator of CREB (cAMP response element-binding) protein, which is directly phosphorylated by PKA (cAMP-dependent protein kinase A). CBP interacts with the activated phosphorylated form of CREB but not with the nonphosphorylated form. We report here that CBP is also a coactivator of the c-myb proto-oncogene product (c-Myb), which is a sequence-specific transcriptional activator. CBP directly binds to the region containing the transcriptional activation domain of c-Myb in a phosphorylation-independent manner in vitro. The domain of CBP that touches c-Myb is also required for binding to CREB. A c-Myb/CBP complex in vivo was demonstrated by a yeast two-hybrid assay. CBP stimulates the c-Myb-dependent transcriptional activation. Conversely, the expression of antisense RNA of CBP represses c-Myb-induced transcriptional activation. In addition, adenovirus EIA, which binds to CBP, inhibits c-Myb-induced transcriptional activation. Our data thus identify CBP as a coactivator of c-Myb. These results suggest that CBP functions as a coactivator for more transcriptional activators than were thought previously.
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91
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Dai P, Bogdanovich S, Zhang Y, Sarachik MP. Response to "Universality of the scaling exponents for the T=0 conductivity and Hall coefficient for very weakly compensated barely metallic silicon". PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:12439-12440. [PMID: 9980388 DOI: 10.1103/physrevb.52.12439] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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92
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Dai P, Mook HA, Seaman CL, Maple MB, Koster JP. Neutron scattering studies of Y1-xUxPd3 compounds. PHYSICAL REVIEW LETTERS 1995; 75:1202-1205. [PMID: 10060231 DOI: 10.1103/physrevlett.75.1202] [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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93
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Bogdanovich S, Dai P, Sarachik MP, Dobrosavljevic V. Universal scaling of the magnetoconductance of metallic Si:B. PHYSICAL REVIEW LETTERS 1995; 74:2543-2546. [PMID: 10057954 DOI: 10.1103/physrevlett.74.2543] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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94
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Dai P, Jiang SC, Gu R, Fang YY. Computer-aided three-dimensional reconstruction and measurement of bony and membranous labyrinth. Chin Med J (Engl) 1994; 107:715-8. [PMID: 7805468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
We used three methods to reconstruct a same bony and membranous labyrinth by an image processing work station (IPWS). Three dimensional (3-D) models of the bony and membranous labyrinth were thus obtained. Different parts of the labyrinth were measured and the spatial relationship between the bony and membranous labyrinth was observed. Many 3-D parameters such as cochlear length, volume of different parts of the labyrinth, angles among the three semicircular canals were measured. The results of this experiment are useful in the study of the cochlear and vestibular function.
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Lam YK, Dai P, Borris R, Dombrowski A, Ransom R, Young G, Beer M, Middlemiss D, Smith J. A new indole from Penicillium daleae. J Antibiot (Tokyo) 1994; 47:724-6. [PMID: 8040078 DOI: 10.7164/antibiotics.47.724] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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96
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Dai P, Zhang Y, Sarachik MP. Critical behavior of the Hall coefficient of Si:P at the metal-insulator transition. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:14039-14042. [PMID: 10010363 DOI: 10.1103/physrevb.49.14039] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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97
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Zhang Y, Dai P, Kam I, Sarachik MP. Empirical relation between longitudinal and transverse transport in insulating n-CdSe. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:5032-5033. [PMID: 10011440 DOI: 10.1103/physrevb.49.5032] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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98
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Dai P, Angot T, Ehrlich SN, Wang S, Taub H. Structural perfection in physisorbed films: A synchrotron x-ray diffraction study of xenon adsorbed on the Ag(111) surface. PHYSICAL REVIEW LETTERS 1994; 72:685-688. [PMID: 10056497 DOI: 10.1103/physrevlett.72.685] [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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99
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Hegde VR, Dai P, Patel MG, Troyanovich JJ, Das P, Puar MS. Isolation and identification of a novel microbial alkaloid. J Antibiot (Tokyo) 1994; 47:110-12. [PMID: 8119852 DOI: 10.7164/antibiotics.47.110] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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100
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Wang SK, Dai P, Taub H. Angle calculations for a five-circle diffractometer used in surface X-ray diffraction experiments. J Appl Crystallogr 1993. [DOI: 10.1107/s0021889893003620] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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