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Temperature affects all enzymes simultaneously in a metabolic system. The enzyme concentration in a biochemical system can be considered as invariant under fast and small temperature change. Therefore, the total sensitivity of a steady state flux through a pathway with respect to the temperature can be expressed as: the apparent activation energy of a steady state pathway flux equals the sum of weighted activation energies of the individual reactions contributing to the flux, where the weighting factors are the flux control coefficients of these reactions in the context of the network. Correspondingly, since the elasticity of any enzyme with respect to temperature is always nonzero, only the reactions with a nonzero flux control coefficient contribute accordingly to the temperature sensitivity of the pathway.
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http://dx.doi.org/10.1016/j.jtherbio.2019.05.017 | DOI Listing |
Aquat Toxicol
September 2025
State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, China. Electronic address:
Microplastics (MPs) have emerged as ubiquitous environmental contaminants, while thallium (Tl), a highly toxic metalloid, is gaining attention as a novel pollutant due to its increasing release from electronic waste and mining activities. These pollutants frequently coexist in aquatic environments; however, their combined effects at environmentally relevant concentrations remain poorly understood. In this study, the adsorption behavior and joint neurotoxicity of polystyrene (PS) microplastics and Tl were systematically evaluated using Caenorhabditis elegans as a model organism.
View Article and Find Full Text PDFComput Biol Chem
September 2025
Department of Physical Education, Xidian University, Xi'an 710126, China. Electronic address:
Parents of children with ASD face significantly greater parenting challenges than those raising typically developing children due to prolonged exposure to their children's developmental disorders, emotional distress, and atypical behaviors, underscoring the urgency of addressing their mental health concerns. This study examined the relationship between fear of negative evaluation (FNE) and social anxiety in parents of children with ASD, with a focus on the mediating roles of perceived social support and coping styles. A cross-sectional survey was conducted among 585 parents of children with ASD using validated instruments: the Brief Fear of Negative Evaluation Scale (BFNE), the Social Anxiety Scale, the Perceived Social Support Scale, and the Simple Coping Style Questionnaire.
View Article and Find Full Text PDFAm J Reprod Immunol
September 2025
Department of Obstetrics and Gynecology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea.
Objective: Exosomes are secreted by most cell types and reflect the internal state of their cells of origin, playing crucial roles in the progression of various pathological conditions. Endometriosis is a chronic, estrogen-dependent inflammatory disease characterized by the ectopic presence of endometrial-like tissue outside the uterus, including in the ovaries, fallopian tubes, and peritoneal cavity. It primarily affects women of reproductive age and is often associated with infertility.
View Article and Find Full Text PDFBioresour Technol
September 2025
Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education (MOE), School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian 116024, China. Electronic address:
This study investigated the effects of five representative biocarriers-biochar (BC), activated carbon (AC), nano-magnetite (NM), zero-valent iron (ZVI), and polyurethane sponge (PUS)-on chain elongation (CE) from ethanol/acetate in anaerobic systems. All carriers enhanced CE to varying extents. BC and NM significantly increased caproate yields (6032.
View Article and Find Full Text PDFInt J Biol Macromol
September 2025
School of Food and Biological Engineering, Hefei University of Technology, Engineering Research Center of Bio-Process, Ministry of Education, Hefei 230601, Anhui, China; Key Laboratory for Animal Food Green Manufacturing and Resource Mining of Anhui Province, Hefei University of Technology, Hefei 23
Holoferritin is considered a promising iron supplement, yet its preparation is challenging due to low extraction efficiencies from natural sources and the potential for structural damage during in vitro mineralization. This study reported the in vivo biosynthesis of a highly stable holoferritin (bs-holoFt) in Escherichia coli a high iron-loading capacity (1213 Fe atoms/protein) and systematically characterized the impact of heat treatments (70-100 °C) on the protein's multi-level structure and dual functions. Results showed a clear, temperature-dependent degradation pathway, initiated by the loss of α-helical content (decreased from 77.
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