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| 1 | An Anomeric Base-Tolerant Ester of 8-Alkynyl-1-naphthoate for Gold(I)-Catalyzed Glycosylation Reaction显示文摘Given the extreme complexity and diversity of carbohydrates,efficient approaches to the homogeneous oligosaccharide remain limited.Chemical synthesis represents one of the most reliable methods to access homogeneous samples,which mainly relies on the key glycosylation reaction.Consistent with enormous efforts to develop leaving groups for establishing robust glycosylation protocols,we herein disclose a structurally novel leaving group of 8-phenylethynyl-1-naphthoate that is able to enable efficient glycosylation reactions under the extremely mild condition of gold(I)-catalysis.Notably,the anomeric naphthoate possesses the unprecedent character of base-stability in sharp contrast to the conventional ester groups at anomeric position of carbohydrates,which endows high compatibility with a variety of chemical transformations.Furthermore,the present glycosylation protocol with 8-phenylethynyl-1-naphthoate as leaving group is able to realize minimally protected glycosylation processes.Mechanistic studies reveal a unique structure of 8-phenylethynyl-1-naphthoate that accounts for the reason for these characteristics. | Xiaojuan Zhang Peng Xu Zhengbing Zhou Yazhou Zhang Biao Yu Yugen Zhu | 2023 | Chinese Journal of Chemistry2023，41，11： | 1 |
| 2 | Construction of a whole-cell catalyst displaying a fungal lipase for effective treatment of oily wastewaters显示文摘 | Huiting Song Lichao Zhou Lujia Zhang Bei Gao Dongzhi Wei Yaling Shen Rui Wang Catherine Madzak Zhengbing Jiang | 2011 | Journal of Molecular Catalysis B Enzymatic2011，，3： | 1 |
| 3 | Episodic crustal growth and reworking at the southeastern margin of the North China Craton: evidence from zircon U–Pb and Lu–Hf isotopes of Archean tonalite–trondhjemite–granodiorite gneisses in the Bengbu-Wuhe area显示文摘The cratonization history of the North China Craton(NCC)and the nature of tectonothermal events are still highly controversial.Tonalite-trondhjemite-granodiorite(TTG)gneisses,as the dominant lithological assemblages in Archean metamorphic terranes,can provide significant clues to the magmatic and metamorphic evolution of Precambrian crust.This study presents zircon laser-ablation inductively-coupled-plasma mass spectrometry U–Pb ages,trace-element,and in-situ LA-MC-ICPMS zircon Hf isotope data for the TTG gneisses from the Bengbu-Wuhe area on the southeastern margin of the NCC.Cathodoluminescence images and trace elements indicated that magmatic zircons display the characteristics of euhedral-subhedral crystals with oscillatory growth zoning structures,high RREE contents,marked Ce positive anomalies,and Pr–Eu negative anomalies.The metamorphic zircons display the spherical-oval crystals with distinct core-rim structures,high and homogeneous luminescent intensity,lower RREE,Nb,Ta,Hf contents,relative flat REE patterns,weak Ce positive anomalies,and Pr-Eu negative anomalies.The Ti–in–zircon geothermometer data indicate that the crystallization temperature of the TTG gneiss ranged from 754 to 868℃.Zircon U–Pb ages indicate that the TTG gneisses formed at 2.79–2.77 Ga and 2.50 Ga and underwent metamorphism at 2.57–2.52 Ga.The Hf isotopic data indicate that the magmatic zircons exhibit high,positive eHf(t)values close to those of the coeval depleted mantle,whereas the metamorphic zircons exhibit negative or nil eHf(t)values.This implies that the TTG gneisses were derived from the partial melting of the~2.9–2.6 Ga juvenile crustal sources mixed with~3.0–2.8 Ga ancient crustal materials.Combined with the regional tectonic evolution,we propose that the metamorphic basement at the southeastern margin of the NCC underwent episodic crustal growth at~2.7 and~2.5 Ga and subsequently underwent crustal reworking or re-melting of the ancient crust during the Neoarchean.The Neoarchean TTG gneisses might have been derived from the partial melting of lower crustal materials related to plate subduction. | Jianjun Wan Andong Wang Jiayong Pan Chengdong Liu Yan Zhao Zhengbing Zhou Xiandong Luo | 2021 | Acta Geochimica2021，40，3： | 0 |
| 4 | 环境因子对叶氮、磷含量异速生长关系的属水平差异的影响显示文摘植物叶片中氮(N)、磷(P)含量的异速生长关系表明了植物对这两种元素的相对投入。而,现有的研究很少关注这一关系在分类单元之间的差异及其成因。本研究基于来自全国1733个样地,属于46个木本被子植物属的2483个叶片样品,利用异速生长方程([N]=α[P]β)分别计算了各属的叶氮、磷含量异速生长指数(β_(L))。然后利用谱系路径分析检验了这些属的气候和土壤生态位条件如何影响属间的β_(L)的差异。生活在贫磷土壤中的属更可能表现出更高的β_(L),即相对于氮而言更强的磷积累,这可能表明了植物对磷限制的抵抗倾向。此外,各属的β_(L)与相对应的土壤氮、磷含量异速生长指数(β_(S))正相关,这可能表明了叶养分的变化受制于作为来源的土壤养分的变化。最后,包括温度和湿度在内的气候因子不会直接影响β_(L)的属间变化,但可能通过调节土壤养分水平发挥间接的作用。谱系关系不会影响各属β_(L)随环境梯度的变化。这些结果揭示了植物对氮、磷摄取的权衡关系可能受属生态位,特别是土壤生态位的影响,表明了β_(L)可以作为一项反映植物养分利用特征如何响应生态位差异的功能属性。 | Yanpei Guo Zhengbing Yan Yi-Wei Zhang Guoyi Zhou Zongqiang Xie Zhiyao Tang | 2021 | Journal of Plant Ecology2021，14，4： | 0 |
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