76
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Chu B, Liu T, Wan Q, Burger C. Polymer-assisted formation of polyoxomolybdates. Acta Crystallogr A 2002. [DOI: 10.1107/s0108767302086099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023] Open
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77
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Katz MG, Chu B, McLachlan R, Alexopoulos NI, de Kretser DM, Cram DS. Genetic follow-up of male offspring born by ICSI, using a multiplex fluorescent PCR-based test for Yq deletions. Mol Hum Reprod 2002; 8:589-95. [PMID: 12029079 DOI: 10.1093/molehr/8.6.589] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
De-novo deletions involving AZFa, b, c and d are one of the most common chromosomal aberrations in man resulting in defective spermatogenesis and male infertility. Currently, Yq deletion screening involves either single or multiplex PCR using Y-specific sequence tagged site markers and the subsequent analysis of the amplification products on ethidium bromide-stained agarose gels. To improve the practicality of routine and high throughput Yq testing, we have developed a more sensitive multiplex fluorescent (FL)-PCR screening system using genomic DNA extracted from cheek buccal cells as a readily available PCR template. For genetic follow-up studies of ICSI-conceived children, we also developed a DNA fingerprinting system based on the co-amplification of four highly polymorphic markers to validate family samples and detect any potential extraneous DNA contamination that could cause a misdiagnosis. Multiplex FL-PCR analysis of buccal cell DNA from two infertile men who conceived three sons by ICSI demonstrated that their Yq deletions were vertically transmitted. Fine mapping with additional Yq markers revealed identical deletion endpoints involving the loss of AZFdc sequences. This firstly indicates that the extent of the Yq deletion was unchanged on ICSI transmission and secondly supports the view that AZFdc deletions may arise by a common de-novo event. Analysis of paternal, maternal and sibling DNA fingerprints showed the co-inheritance of parental alleles by each male child and confirmed the expected relationship between each family member. The application of these new FL-PCR based screening tests in genetic follow-up studies will assist in confirming transmission of specific genetic defects to male offspring conceived by ICSI and provide a basis for genetic counselling and potential treatment options as these boys approach sexual maturity.
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78
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Bucher J, Diamond RM, Chu B. Selectivity in heterovalent anion exchange. Ion pairing vs. ion hydration. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100661a021] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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79
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He MJ, Kubota K, Pope J, Chu B. Static and dynamical properties of polystyrene in carbon tetrachloride. 3. Effects of freezing on solution properties. Macromolecules 2002. [DOI: 10.1021/ma00230a089] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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80
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Chu B, Onclin M, Ford JR. Laser light scattering characterization of polyethylene in 1,2,4-trichlorobenzene. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j150670a019] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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81
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82
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Chu B. CRITICAL OPALESCENCE OF METHANOL—CYCLOHEXANE, TRANSMISSION MEASUREMENTS. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100804a006] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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83
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Mandelkern L, Alamo RG, Sokolov EL, Li Y, Chu B. Small-Angle X-ray Scattering of n-Hexacontane as a Function of Temperature. Macromolecules 2002. [DOI: 10.1021/ma00086a054] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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84
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Fytas G, Dorfmueller T, Lin YH, Chu B. Photon correlation spectroscopy of bulk siloxane polymers. Macromolecules 2002. [DOI: 10.1021/ma50005a039] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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85
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Chu B, Gulari E. Polymer Diffusion in a Dilute Solution. 2. Poly[bis(m-chlorophenoxy)phosphazene] in Chloroform. Macromolecules 2002. [DOI: 10.1021/ma60069a020] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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86
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Lin YH, Chu B. Observation of a Pseudo-Transition Phenomenon between Dilute and Semidilute Regimes in a Polymer Solution. Macromolecules 2002. [DOI: 10.1021/ma60076a055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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87
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88
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Debye P, Chu B. SPECTROPHOTOMETRY AND LIGHT SCATTERING ON SUPPORTED PLATINUM1,2. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100812a014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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89
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Chu B, Nose T. Static and Dynamical Properties of Polystyrene in trans-Decalin. 2. Correlation Function Profile Analysis by the Histogram Method. Macromolecules 2002. [DOI: 10.1021/ma60070a011] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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90
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Chu B, Fytas G, Zalczer G. Study of thermal polymerization of styrene by Raman scattering. Macromolecules 2002. [DOI: 10.1021/ma50003a031] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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91
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Nose T, Chu B. Static and Dynamical Properties of Polystyrene in trans-Decalin. 3. Polymer Dimensions in Dilute Solution in the Transition Region. Macromolecules 2002. [DOI: 10.1021/ma60072a023] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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92
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Chu B, Kubota K. Excimer fluorescence as a molecular probe of spinodal decomposition in polymer fluids. Macromolecules 2002. [DOI: 10.1021/ma50007a047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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93
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Nose T, Chu B. Static and Dynamical Properties of Polystyrene in trans-Decalin. 1. NBS 705 Standard Near θ Conditions. Macromolecules 2002. [DOI: 10.1021/ma60070a010] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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94
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Song HH, Stein RS, Wu DQ, Ree M, Phillips JC, LeGrand A, Chu B. Time-resolved SAXS on crystallization of a low-density polyethylene/high density polyethylene polymer blend. Macromolecules 2002. [DOI: 10.1021/ma00182a057] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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95
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Lin YH, Chu B. Static and dynamical properties of polystyrene in carbon tetrachloride. 1. Characteristic frequency in the dilute, intermediate, and semidilute regions. Macromolecules 2002. [DOI: 10.1021/ma50003a029] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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96
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Chu B, Kubota K, He MJ, Lin YH. Static and dynamical properties of polystyrene in carbon tetrachloride. 2. Osmotic pressure and radius of gyration in the dilute, intermediate, and semidilute regions. Macromolecules 2002. [DOI: 10.1021/ma50003a030] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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97
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Chu B. Critical Opalescence of a Fluorocarbon-Hydrocarbon Liquid Mixture. Normal Perfluoroheptane-Normal Heptane. J Am Chem Soc 2002. [DOI: 10.1021/ja01071a033] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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98
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Chu B, Nose T. Static and Dynamical Properties of Polystyrene in trans-Decalin. 4. Osmotic Compressibility, Characteristic Lengths, and Internal and Pseudogel Motions in the Semidilute Regime. Macromolecules 2002. [DOI: 10.1021/ma60073a024] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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99
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Chu B, Schoenes FJ, Kao WP. Spatial and time-dependent concentration fluctuations of the isobutyric acid-water system in the neighborhood of its critical mixing point. J Am Chem Soc 2002. [DOI: 10.1021/ja01014a009] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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100
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Liu T, Wan Q, Xie Y, Burger C, Liu LZ, Chu B. Polymer-assisted formation of giant polyoxomolybdate structures. J Am Chem Soc 2001; 123:10966-72. [PMID: 11686700 DOI: 10.1021/ja010366r] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A highly ordered, porous nanoscale network structure of polyoxomolybdate was prepared from the slow decomposition of an unstable precursor compound MoO(2)(OH)(OOH) in the presence of PEO-containing triblock copolymer gels or semidilute/concentrated poly(ethylene oxide) (PEO) homopolymer solutions. Small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD) measurements of the 1-microm size crystals revealed an extremely ordered primitive cubic (pc) structure made of polyoxomolybdates. Scanning electron microscopy (SEM) measurements showed that the overall size of these single crystals was close to 1 microm, in agreement with estimates from the scattering peak widths. Evidence from both scattering measurements and transmission electron microscope (TEM) measurements suggested that the system formed a highly porous primitive cubic network similar to that of certain zeolite structures. However, the observed lattice constant of 5 nm was much larger. The function of the PEO-containing polymer network was found to be very subtle and complex. Presumably, PEO acted simultaneously as a weak reducing agent and as a viscous matrix to ensure sufficient time for the formation of long-range ordered structures, resulting in the growth of extremely uniform but probably hollow "nanospheres". We suggest that this new material may find unique applications as a high-efficiency absorbent or catalyst. Furthermore, the current synthetic method may open up new pathways to prepare similar functional nanomaterials.
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