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1. Evaluation of the properties of hybrid yellow poplar (Liriodendron sino-americanum): A comparison study with yellow poplar (Liriodendron tulipifera)

Author

Xinhao Feng, Yating Sheng, Xiaowei Ge, Zhihui Wu, and Qiongtao Huang

Subjects
hybrid yellow poplar, liriodendron sino-americanum, liriodendron tulipifera, yellow poplar, wood properties, Forestry, SD1-669.5, Manufactures, TS1-2301
Abstract

As one of fast-growth wood species, hybrid yellow poplar (YP-h, Liriodendron sino-americanum) has been extensively planted throughout of China, however, little is known about its properties and applicability in structural and nonstructural applications such as construction and furniture. The aim of this study was to evaluate the properties of YP-h and examine its differences with yellow poplar (YP, Liriodendron tulipifera). The average vessel diameter of YP-h (55 μm) was 19 % lower than YP (68 μm), but, the density of YP-h was 37 % higher than YP and the dimensional change in YP-h was higher than YP. Comparable tensile strength and flexural modulus were found in YP-h and YP, however, the flexural, shear, and impact strength of YP-h was 35 %, 40 %, and 55 % higher than those of YP, respectively. The drilling, mortising, and turning processability of YP-h were superior to those of YP. Compared to the gluing and coating performance of YP, YP-h had inferior gluing properties and equivalent coating performance. Therefore, hybrid yellow poplar can be an ideal candidate for yellow poplar to be utilized in construction and furniture.

Published
2021

2. Stable immobilization of uranium in iron containing environments with microbial consortia enriched via two steps accumulation method

Author

Yating Sheng, Yuxin Liu, Wenzhong Wang, Yuling Zhu, Jiemin Chen, Xiaoyun He, and Baowei Hu

Subjects
biology, Bacteria, Precipitation (chemistry), Health, Toxicology and Mutagenesis, Iron, Microbial Consortia, Caulobacteraceae, chemistry.chemical_element, General Medicine, Uranium, Toxicology, biology.organism_classification, Pollution, Soil, chemistry, Aminobacter, Stenotrophomonas, Oxidation-Reduction, Nuclear chemistry
Abstract

The stable stabilization of uranium (U) in iron (Fe) containing environments is restricted by the reoxidation of UO2. In the current study, based on air reoxidation tests, we propose a novel two steps accumulation method to enrich microbial consortia from paddy soil. The constructed microbial consortia, denoted as the Fe–U bacteria, can co-precipitate U and Fe to form stable Fe–U solids. Column experiments running for 4 months demonstrated the production of U(IV)–O–Fe(II) precipitates containing maximum of 39.51% uranium in the presence of Fe–U bacteria. The reoxidation experiments revealed the U(IV)–O–Fe(II) precipitates were more stable than UO2. 16S rDNA high throughput sequencing analysis demonstrated that Acinetobacter and Stenotrophomonas were responsible for Fe and U precipitation, while, Caulobacteraceae and Aminobacter were crucial for the formation of U(VI)-PO4 chemicals. The proposed two steps accumulation method has an extraordinary application potential in stable immobilization of uranium in iron containing environments.

Published
2021

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