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Dhika Aditya Gandamana, Bin Wang, Ciputra Tejo, Benoit Bolte, Fabien Gagosz, Shunsuke Chiba
A new protocol for the deoxygenation of alcohols and the hydrogenation of alkenes under Brønsted acid catalysis has been developed. The method is based on the use of a benzyl or an isopropyl ether as a traceless hydrogen atom donor and involves an intramolecular hydride transfer as a key step that can be achieved in regio- and stereoselective manners.
March 25, 2018: Angewandte Chemie
Dhika Amanda, Monika S Doblin, Roberta Galletti, Antony Bacic, Gwyneth C Ingram, Kim L Johnson
Defective Kernel1 (DEK1) is a plant-specific calpain involved in epidermis specification and maintenance. DEK1 regulation of the epidermal cell wall is proposed to be key to ensure tissue integrity and coordinated growth. Changes in the expression of DEK1 are correlated with changes in the expression of cell wall-related genes. For example, we have found that Lipid transfer protein 3 (LTP3), EXPANSIN 11 (EXP11), and an AP2 transcription factor (AP2TF) are misexpressed in plants with constitutively altered levels of DEK1 activity...
August 3, 2017: Plant Signaling & Behavior
Dhika Amanda, Monika S Doblin, Roberta Galletti, Antony Bacic, Gwyneth C Ingram, Kim L Johnson
The plant epidermis is crucial to survival, regulating interactions with the environment and controlling plant growth. The phytocalpain DEFECTIVE KERNEL1 (DEK1) is a master regulator of epidermal differentiation and maintenance, acting upstream of epidermis-specific transcription factors, and is required for correct cell adhesion. It is currently unclear how changes in DEK1 lead to cellular defects in the epidermis and the pathways through which DEK1 acts. We have combined growth kinematic studies, cell wall analysis, and transcriptional analysis of genes downstream of DEK1 to determine the cause of phenotypic changes observed in DEK1-modulated lines of Arabidopsis (Arabidopsis thaliana)...
December 2016: Plant Physiology
Bo Teng, Wenchao Chen, Shen Dong, Choon Wee Kee, Dhika Aditya Gandamana, Lili Zong, Choon-Hong Tan
Most asymmetric phase transfer reactions are Brønsted base reactions, and the inorganic bases used greatly influenced the profile of the reaction. Alkoxide salts are able to activate substrates with high pKa values, but background reactions are often unavoidable. On the other hand, carbonate and phosphate salts are milder, but their low basicity limits the scope of their reactions. This presents a difficult situation whereby fragile substrates such as lactone will be hydrolyzed by a stronger base but will not be activated with a weaker one...
August 10, 2016: Journal of the American Chemical Society
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