40 research outputs found

    A New Layered Silicogermanate PKU-23 and Its Transformation to a Zeolite with Three-Dimensional Channels

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    PKU-23, a new layered silicogermanate with eight-ring pores in the crystalline sheets, was hydrothermally synthesized under fluoride conditions by using 4-dimethylaminopyridine (DMAP) or 1-benzyl-4-dimethylaminopyridinium hydroxide (DMAP-Bn) as organic structure directing agents (OSDAs). The structure determination from single-crystal X-ray diffraction showed the PKU-23 was a layered material with the double four-ring (d4r) units connected by the interrupted zigzag chains. The layers in PKU-23 were found to stack by simple translation. The OSDA cations were occluded between the adjacent layers. The topotactic condensation of layered PKU-23 resulted in a three-dimensional (3D) zeolite PKU-23-Z, which possessed a 10 × 8 × 8 channel system. The framework topology of PKU-23-Z is the same as zeolite ECNU-16. PKU-23 is the first reported zeolite precursor that could form a 3D channel system after topotactic condensation

    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

    Characteristics of COPD Patients and Healthy Controls<sup>a</sup>.

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    a<p>FEV<sub>1</sub>, forced expiratory volume in 1 s; FVC, functional vital capacity. Date for FEV<sub>1%</sub> and FVC % are expressed as mean ± SD.</p
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