Results 71 to 80 of about 2,222,500 (385)

Facile Synthesis of the Naturally Cytotoxic Triterpenoid Saponin Patrinia-Glycoside B-II and Its Conformer

Molecules, 2013
The first chemical synthesis of the natural triterpenoid saponin Patrinia-glycoside B-II, namely oleanolic acid 3-O-α-L-rhamnopyranosyl-(1→2)-[β-D-gluco-pyranosyl-(1→3)]-α-L-arabinopyranoside, has been accomplished in a linear 11-step sequence 11 with 9.
Li Ren, Yong-Xiang Liu, Dan Lv, Mao-Cai Yan, Han Nie, Yang Liu, Mao-Sheng Cheng   +6 more
doaj   +1 more source

Growth, yield and fiber quality characteristics of Bt and non-Bt cotton cultivars in response to boron nutrition

Journal of Cotton Research, 2023
Background Boron (B) deficiency is an important factor for poor seed cotton yield and fiber quality. However, it is often missing in the plant nutrition program, particularly in developing countries.
Muhammad MEHRAN, Muhammad ASHRAF, Sher Muhammad SHAHZAD, Muhammad Siddique SHAKIR, Muhammad Tehseen AZHAR, Fiaz AHMAD, Alamgir ALVI   +6 more
doaj   +1 more source

Trends and perspectives on general Pesticide analytical chemistry

Advanced Agrochem, 2022
Agrochemicals are indispensable materials in agricultural production, used to control or prevent diseases, insects and weeds, and play important roles in ensuring both food security and food safety.
Yangliu Wu, Lijun Han, Xuemin Wu, Wayne Jiang, Hui Liao, Zhi Xu, Canping Pan   +6 more
doaj   +1 more source

A stepwise emergence of evolution in the RNA world

FEBS Letters, EarlyView.
How did biological evolution emerge from chemical reactions? This perspective proposes a gradual scenario of self‐organization among RNA molecules, where catalytic feedback on random mixtures plays the central role. Short oligomers cross‐ligate, and self‐assembly enables heritable variations. An event of template‐externalization marks the transition to
Philippe Nghe
wiley   +1 more source

Iron-mediated Preparation of Vinylcyclopropanes. Scope, Mechanism, and Applications [PDF]

, 2003
The addition of stabilized carbon nucleophiles to tricarbonyl(1-methoxycarbonylpentadienyl)iron(1+) cation (1a) proceeds via attack at C2 on the face of the ligand opposite the Fe(CO)3 group to generate tricarbonyl(pentenediyl)iron complexes 2. Oxidation
Cao, Yeyu, Donaldson, William A., Godula, Kamil, Yun, Young K.   +3 more
core   +1 more source

Fast and Selective Degradation of Biomass for Xylose, Glucose and Lignin under Mild Conditions

Molecules, 2023
The conversion of lignocellulose into valuable chemicals has been recognized as the key technology in green chemistry. However, selective degradation of hemicellulose and cellulose with the production of lignin is still a challenge. Therefore, a two-step
Shangzhong Zhang, Yi Duan, Changchang Teng, Hongdong Quan, Xiuguo Yang, Hongyan Li, Xiaohe Li, Lifeng Yan   +7 more
doaj   +1 more source

B cell mechanobiology in health and disease: emerging techniques and insights into therapeutic responses

FEBS Letters, EarlyView.
B cells sense external mechanical forces and convert them into biochemical signals through mechanotransduction. Understanding how malignant B cells respond to physical stimuli represents a groundbreaking area of research. This review examines the key mechano‐related molecules and pathways in B lymphocytes, highlights the most relevant techniques to ...
Marta Sampietro, Marco Cellani, Cristina Scielzo   +2 more
wiley   +1 more source

A 1-acetamido derivative of 6-epi-valienamine: an inhibitor of a diverse group of β-N-acetylglucosaminidases [PDF]

, 2007
The synthesis of an analogue of 6-epi-valienamine bearing an acetamido group and its characterisation as an inhibitor of β-N-acetylglucosaminidases are described.
Adrian Scaffidi, Backvall, Bailey, Beer, Chen, Chretien, David J. Vocadlo, Davies, Davies, Dennis, Dong, Dorfmueller, Edward J. Taylor, Emsley, Esnouf, Fairweather, Gideon J. Davies, Horsch, Junge, Kappes, Keith A. Stubbs, Knapp, Kraulis, Legler, Lin, Liu, Liu, Macauley, Mark, Money, Murshudov, Namiki, Nicotra, Ogawa, Rana, Rao, Rebecca J. Dennis, Robert V. Stick, Salleh, Scaffidi, Shanmugasundaram, Shitara, Sigurskjold, Stubbs, Stubbs, Svensson, Tanaka, Terinek, Tews, Vocadlo   +49 more
core   +1 more source

Length-Dependent Transition from Extended to Folded Shapes in Short Oligomers of an Azetidine-Based α-Amino Acid: The Critical Role of NH···N H-Bonds

Molecules, 2023
Hydrogen bonds (H-bonds) are ubiquitous in peptides and proteins and are central to the stabilization of their structures. Inter-residue H-bonds between non-adjacent backbone amide NH and C=O motifs lead to the well-known secondary structures of helices,
Dayi Liu, Jean-Xavier Bardaud, Zeynab Imani, Sylvie Robin, Eric Gloaguen, Valérie Brenner, David J. Aitken, Michel Mons   +7 more
doaj   +1 more source

Evolutionary interplay between viruses and R‐loops

FEBS Letters, EarlyView.
Viruses interact with specialized nucleic acid structures called R‐loops to influence host transcription, epigenetic states, latency, and immune evasion. This Perspective examines the roles of R‐loops in viral replication, integration, and silencing, and how viruses co‐opt or avoid these structures.
Zsolt Karányi, Zita Képes, Zoltán Szabó, Eszter Csoma, Lóránt Székvölgyi   +4 more
wiley   +1 more source