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We present an operationally simple iterative coupling strategy for the synthesis of oligomeric homo- and hetero[n]rotaxanes with precise control over the position of each macrocycle. The exceptional yield of the AT-CuAAC reaction, combined with optimized conditions that allow the rapid synthesis of the target oligomers, opens the door to the study of precision-engineered oligomeric interlocked molecules.
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http://dx.doi.org/10.1021/jacs.6b08958 | DOI Listing |
Sci Adv
March 2025
Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, UK.
Microelectrode arrays (MEAs) permit recordings with high electrode counts, thus generating complex datasets that would benefit from precise neuronal spike sorting for meaningful data extraction. Nevertheless, conventional spike sorting methods face limitations in recognizing diverse spike shapes. Here, we introduce PseudoSorter, which uses self-supervised learning techniques, a density-based pseudolabeling strategy, and an iterative fine-tuning process to enhance spike sorting accuracy.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
March 2025
UNIVERSITY OF Chicago, Department of Chemistry, 5735 S. Ellis Ave, 60637, Chicago, UNITED STATES OF AMERICA.
Despite the recent advancement, Matteson-type reactions are almost exclusively used to construct linear molecules. Herein we report an iterative boron-homologation approach to construct various carbocycles from a single precursor. This method utilizes an electron-withdrawing group (EWG) as a handle to enable intramolecular Matteson-type couplings, leading to diastereoselective and enantioselective ring formation.
View Article and Find Full Text PDFChemistry
March 2025
Shanghai Institute of Materia Medica Chinese Academy of Sciences, Carbohydrate-Based Drug Research Center, 555 Zu-Chong-Zhi Road, 201203, Shanghai, CHINA.
An efficient chemoenzymatic approach for the diversity-oriented synthesis of core-fucosylated asymmetrical N-glycans bearing different lengths of oligo-N-acetyllactosamine (LacNAc) and their sialylated extensions was described. Two oligosaccharide precursors were chemically synthesized by length-controlled introduction of oligo-LacNAc motifs through stereoselectively iterative glycosylation of a common hexasaccharide intermediate. Both oligosaccharide precursors can be well recognized by α1,6-fucosyltransferase FUT8 to generate core-fucosylated N-glycans, which was subjected to divergent enzymatic extension using a galactosyltransferase module and two sialyltransferase modules to provide a wide array of core-fucosylated asymmetrical biantennary N-glycans having different-length oligo-LacNAc motifs capped by various sialic acid-linkages.
View Article and Find Full Text PDFBMC Biotechnol
March 2025
Department of Pathology and Molecular Medicine HSC 4H19, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4K1, Canada.
Background: The naturally occurring variant Alpha-1 Antitrypsin M358R (AAT M358R), modified at the P1 position of the reactive center loop (RCL), shifts its inhibitory protease target from neutrophil elastase to multiple coagulation and contact proteases, including activated plasma kallikrein (Pka; KLKB1). Our aim was to increase the specificity of AAT M358R for Pka as a potential novel therapeutic agent to treat pathological swelling arising from elevated Pka levels in patients with Hereditary Angioedema.
Results: Two AAT M358R T7Select phage display libraries randomized at RCL positions P7-P3 and P2-P3' were iteratively probed with Pka.
BMC Genomics
March 2025
School of Life Sciences, Nantong University, Nantong, 226019, China.
Background: Cold stress significantly challenges cotton growth and productivity, yet the genetic and molecular mechanisms underlying cold tolerance remain poorly understood.
Results: We employed RNA-seq and iterative weighted gene co-expression network analysis (WGCNA) to investigate gene and transposable element (TE) expression changes at six cold stress time points (0 h, 2 h, 4 h, 6 h, 12 h, 24 h). Thousands of differentially expressed genes (DEGs) were identified, exhibiting time-specific patterns that highlight a phase-dependent transcriptional response.
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