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Isolation of Natural Products Using Preparative TLC.
Methods Mol Biol
January 2025
Department of Biomedical and Pharmaceutical Sciences, Graduate School, Kyung Hee University, Seoul, Republic of Korea.
Known for their diverse and potent physiological activities, natural products continue to be essential for the discovery and development of new drugs. This chapter explores the pivotal role of preparative thin-layer chromatography (Prep-TLC) in the isolation of natural products. This chapter begins with an understanding of the historical significance and structural complexity of natural products, and discusses the problems caused by complex mixtures present in extracts, as well as the multifunctionality, cost-effectiveness, and compatibility with different sample types of Prep-TLC to address these challenges.
View Article and Find Full Text PDFOptimal placement of ambulance stations using data-driven direct and surrogate search methods.
Int J Med Inform
January 2025
Department of Mathematics and Mathematical Statistics, Umeå University, 901 87, Umeå, Sweden. Electronic address:
Objective: In this paper, we implement and validate a set of optimization approaches that were applied on ambulance data from the Västerbotten county in Sweden collected 2018, with the objective to find the optimal placement of the ambulance stations (or stand-by positions) in Umeå, a municipality in the county with regards to median of response times for priority 1 alarms, the most urgent type of alarms (MRT1).
Methods: Here, we use data-driven approaches for optimizing the placement of ambulance stations. For a given allocation, i.
Parallel median consensus clustering in complex networks.
Sci Rep
January 2025
Department of Intelligent Systems Engineering, Indiana University, Bloomington, IN, USA.
We develop an algorithm that finds the consensus among many different clustering solutions of a graph. We formulate the problem as a median set partitioning problem and propose a greedy optimization technique. Unlike other approaches that find median set partitions, our algorithm takes graph structure into account and finds a comparable quality solution much faster than the other approaches.
View Article and Find Full Text PDFComputer Simulations of the Temperature Dependence of Enzyme Reactions.
J Chem Theory Comput
January 2025
Department of Chemistry, University of Tromsø - The Arctic University of Norway, N9037 Tromsø, Norway.
In this review we discuss the development of methodology for calculating the temperature dependence and thermodynamic activation parameters for chemical reactions in solution and in enzymes, from computer simulations. We outline how this is done by combining the empirical valence bond method with molecular dynamics free energy simulations. In favorable cases it turns out that such simulations can even capture temperature optima for the catalytic rate.
View Article and Find Full Text PDFWhat's on the agenda? Examining public health communication about opioids.
J Health Psychol
January 2025
The way media portray public health problems influences the public's perception of problems and related solutions. Social media allows users to engage with news and to collectively construct meaning. This paper examined news in comparison to user-generated content related to opioids to understand the role of second-level agenda-setting in public health.
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