Tectonic background of the Kuda ophiolite, western Kunlun: new constraints from boninite series rocks

通过对依莎克群火山岩的地球化学研究，首次在西昆仑库地蛇绿岩中发现了玻安岩系岩石。这些岩石具有高SiO2、低TiO2、高Al2O3/TiO2 比值和高Cr 含量，亏损Y 和REE，呈现轻稀土富集的分布模式以及相对低的Ti/Zr 比值和高的Zr/Y 比值。其中一些样品还具有相当于MORB 的Nb、Ta 含量和相应较小的La/Nb 比值，表明在其形成过程中可能有富集地幔端员的介入。玻安岩系岩石的发现以及火山地层序列的岩性变化表明，依莎克群火山岩形成于初始的大洋岛弧或弧后盆地拉张的早期阶段，火山岩的地球化学组成变化以及玻安岩在依莎克群火山序列中的位置表明，原特提斯的消减方向应当是向北的。Preliminary geochemical study is conducted for the Yishake volcanic sequence of Küda ophiolote, West Kunlun, and boninite series rocks are just recognized for the first time in this area. The boninite series rocks are characterized by relatively high SiO2 and Cr, high Al2O3/TiO2 ratios and being very depleted in TiO2, Y and REE. They all exhibit LREE enriched patterns and show low Ti/Zr and high Zr/Y ratios. Some of these samples possess relatively high Nb and Ta contents equivalent to those of MORB and accordingly low …published_or_final_versio

Enhanced photocatalytic activity of Ce??-TiO?for 2-mercaptobenzothiazole degradation in aqueous suspension for odour control

Author name used in this publication: F. B. LiAuthor name used in this publication: X. Z. Li2004-2005 > Academic research: refereed > Publication in refereed journalAccepted ManuscriptPublishe

Enhanced photocatalytic degradation of VOCs using Ln??-TiO?catalysts for indoor air purification

Author name used in this publication: F. B. LiAuthor name used in this publication: X. Z. LiAuthor name used in this publication: C. H. AoAuthor name used in this publication: S. C. Lee2004-2005 > Academic research: refereed > Publication in refereed journalAccepted ManuscriptPublishe

Photocatalytic conversion of NO using TiO?-NH?catalysts in ambient air environment

Author name used in this publication: F. B. LiAuthor name used in this publication: X. Z. LiAuthor name used in this publication: C. H. AoAuthor name used in this publication: S. C. Lee2004-2005 > Academic research: refereed > Publication in refereed journalAccepted ManuscriptPublishe

Photoelectrocatalytic properties and reactivity of Ti/Au-TiO2 mesh electrodes

2002-2003 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Diabetes causes marked inhibition of mitochondrial metabolism in pancreatic β-cells

Diabetes is a global health problem caused primarily by the inability of pancreatic β-cells to secrete adequate levels of insulin. The molecular mechanisms underlying the progressive failure of β-cells to respond to glucose in type-2 diabetes remain unresolved. Using a combination of transcriptomics and proteomics, we find significant dysregulation of major metabolic pathways in islets of diabetic βV59M mice, a non-obese, eulipidaemic diabetes model. Multiple genes/proteins involved in glycolysis/gluconeogenesis are upregulated, whereas those involved in oxidative phosphorylation are downregulated. In isolated islets, glucose-induced increases in NADH and ATP are impaired and both oxidative and glycolytic glucose metabolism are reduced. INS-1 β-cells cultured chronically at high glucose show similar changes in protein expression and reduced glucose-stimulated oxygen consumption: targeted metabolomics reveals impaired metabolism. These data indicate hyperglycaemia induces metabolic changes in β-cells that markedly reduce mitochondrial metabolism and ATP synthesis. We propose this underlies the progressive failure of β-cells in diabetes.Peer reviewe

Microbially mediated mechanisms underlie soil carbon accrual by conservation agriculture under decade-long warming

This is the final version. Available on open access from Nature Research via the DOI in this recordData availability: The DNA sequences of the 16S rRNA gene and ITS amplicons in this study have been deposited in the National Center for Biotechnology Information (NCBI) under project accession numbers PRJNA903096 and PRJNA903090. Raw shotgun metagenomic sequences in this study have been deposited in the National Center for Biotechnology Information (NCBI) under project accession PRJNA1007786. Silva database is available at https://www.arb-silva.de/. UNITE database is available at https://unite.ut.ee/. Source data are provided in this paper. Source data are provided with this paper.Code availability: The analysis code that supports the findings of this study is available at GitHub https://github.com/bio-carbon/code.Increasing soil organic carbon (SOC) in croplands by switching from conventional to conservation management may be hampered by stimulated microbial decomposition under warming. Here, we test the interactive effects of agricultural management and warming on SOC persistence and underlying microbial mechanisms in a decade-long controlled experiment on a wheat-maize cropping system. Warming increased SOC content and accelerated fungal community temporal turnover under conservation agriculture (no tillage, chopped crop residue), but not under conventional agriculture (annual tillage, crop residue removed). Microbial carbon use efficiency (CUE) and growth increased linearly over time, with stronger positive warming effects after 5 years under conservation agriculture. According to structural equation models, these increases arose from greater carbon inputs from the crops, which indirectly controlled microbial CUE via changes in fungal communities. As a result, fungal necromass increased from 28 to 53%, emerging as the strongest predictor of SOC content. Collectively, our results demonstrate how management and climatic factors can interact to alter microbial community composition, physiology and functions and, in turn, SOC formation and accrual in croplands.National Natural Science Foundation of ChinaNational Key R&D Program of China2115 Talent Development Program of China Agricultural UniversityBeijing Advanced Disciplines and Strategic Priority Research Program of the Chinese Academy of Science

Relationship between molecular properties and degradation mechanisms of organic solar cells based on bis-adducts of phenyl-C61 butyric acid methyl ester

Environmental stability remains a major challenge for the commercialisation of organic solar cells and degradation pathways remain poorly understood. Designing materials for improved device stability requires an understanding of the relationship between the properties of the donor or acceptor molecule and different degradation mechanisms. Here we study the correlations between various molecular parameters of the fullerene derivative bis-PCBM and the degradation rate of polymer:bis-PCBM organic solar cells, based on the same carbazole-alt-benzothiadiazole polymer, in aerobic and anaerobic conditions. We compare eight high purity bis-PCBM isomers with different electronic, chemical and packing properties along with PCBM and the mixture of bis isomers. In the case of aerobic photodegradation, we find that device degradation rate is positively correlated to the LUMO energy of the bis-PCBM isomer and to the degree of crystallinity of the isomer, while the correlation of degradation with driving force for epoxide formation is unclear. These results support the idea that in these samples, aerobic photodegradation proceeds via superoxide formation by the photogenerated polaron on the fullerene, followed by further chemical reaction. In the absence of air, photodegradation rate is correlated with molecular structure, supporting the mechanism of microstructural degradation via fullerene dimerization. The approach and findings presented here show how control of specific molecular parameters through chemical design can serve as a strategy to enhance stability of organic solar cells