26 research outputs found

    Synthesis and Characterization of a Layered Silicogermanate PKU-22 and Its Topotactic Condensation to a Three-Dimensional <b>STI</b>-type Zeolite

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    A new layered silicogermanate, PKU-22, was hydrothermally synthesized under fluoride conditions using the tetraethylammonium (TEA<sup>+</sup>) cation as the structure directing agent (SDA). The crystal structure was determined by single crystal X-ray diffraction. Structure analysis reveals that PKU-22 is constructed by <u>sti</u> layers stacking along the [100] direction in an ···AAAA··· manner, with TEA<sup>+</sup> cations occurring in the interlayer spaces and F<sup>–</sup> anions residing within the layer and connecting to Ge atoms, which also act as the charge compensation species. <i>In situ</i> temperature-variable powder X-ray diffraction results indicated that PKU-22 could be transferred into a three-dimensional <b>STI</b>-type zeolite PKU-22a on heating. It is interesting that the TEA<sup>+</sup> cations remain intact in the structure of the condensed product. Solid-state NMR, inductively coupled plasma atomic emission spectroscopy, thermogravimetric-differential scanning calorimetry, and carbon, hydrogen, and nitrogen elemental analyses were applied to aid the structure analysis of PKU-22 and illustrate its transformation. The scheme of the topotactic condensation of PKU-22 to PKU-22a is proposed

    Distribution on the chromosomes of SNPv of eight varieties and chip SNP.

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    <p>1~4: the salt sensitive varieties: Hengmian3, GK50, Xinyan96-48, ZhongS9612; 5~8: the salt tolerant varieties: CRI35, Zhong9807, CRI 44, Kanghuangwei164; 9: Illumina Cotton SNP 70K Chip.</p

    Representative CPMG <sup>1</sup>H NMR spectra of serum obtained from (A) controls and (B) COPD patients.

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    <p>The region of δ 6.5–9.0 (in the dashed box) was magnified 16 times compared with corresponding region of δ 0.5–5.5 for the purpose of clarity. Keys: 1-MH: 1-Methylhistidine; 3-MH: 3-Methylhistidine; AA: Acetoacetate; Ace: Acetate; Act: Acetone; Ala: Alanine; Cr: Creatine; Eth: Ethanol; For: Formate; Glc: Glucose; Gln: Glutamine; Glu: Glutamate; Gly: Glycine; GPC: Glycerolphosphocholine; Ileu: Isoleucine; L1: HDL, CH3-(CH2)n-; L2: VLDL, CH3-(CH2)n-; L3: HDL, CH3-(CH2)n-; L4: VLDL, CH3-(CH2)n-; L5: VLDL, -CH2-CH2-C = O; L6: Lipid, -CH2-CH = CH-; L7: Lipid, -CH2-CH = CH-; L8: Lipid, -CH2-C = O; L9: Lipid, = CH-CH2-CH = ; L10: Lipid, -CH = CH-; Lac: Lactate; Leu: Leucine; Lys: Lysine; m-I: myo-Inositol; NAG: N-acetyl glycoprotein signals; Phe: Phenylalanine; Tyr: Tyrosine; Val: Valine.</p
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