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Oligodendroglial heterogeneity in health,disease,and recovery:deeper insights into myelin dynamics

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Neural Regeneration Research 2025年第11期20卷 3179-3192页

作者： pieter-Jan Serneels Julie D.De Schutter Lies De Groef Lieve Moons Steven Bergmans KU Leuven Leuven Brain InstituteDepartment of BiologyAnimal Physiology and Neurobiology DivisionNeural Circuit Development&Regeneration Research GroupLeuvenBelgium KU Leuven Leuven Brain InstituteDepartment of BiologyAnimal Physiology and Neurobiology DivisionCellular Communication&Neurodegeneration Research GroupLeuvenBelgium

Decades of research asserted that the oligodendroglial lineage comprises two cell types:oligodendrocyte precursor cells and ***,recent studies employing single-cell RNA sequencing techniques have uncovered novel cell states,prompting a revision of the existing *** forward,the oligodendroglial lineage should be delineated into five distinct cell states:oligodendrocyte precursor cells,committed oligodendrocyte precursor cells,newly formed oligodendrocytes,myelin-forming oligodendrocytes,and mature *** new classification system enables a deeper understanding of the oligodendroglia in both physiological and pathological *** this uniform terminology will facilitate comparison and integration of data across ***,including the consolidation of findings from various demyelinating models,is essential to better understand the pathogenesis of demyelinating ***,comparing injury models across species with varying regenerative capacities can provide insights that may lead to new therapeutic strategies to overcome remyelination ***,by standardizing terminology and synthesizing data from diverse studies across different animal models,we can enhance our understanding of myelin pathology in central nervous system disorders such as multiple sclerosis,Alzheimer's disease,and amyotrophic lateral sclerosis,all of which involve oligodendroglial and myelin dysfunction.

关键词： animal models demyelination fish mammals multiple sclerosis myelin neurodegeneration oligodendrocytes oligodendroglial lineage remyelination

Maximum depositional age estimation revisited

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Geoscience Frontiers 2021年第2期12卷 843-850页

作者： pieter Vermeesch Department of Earth Sciences University College LondonGower StreetLondon WC1E 6BTUnited Kingdom

In a recent review published in this journal,Coutts et al.(2019)compared nine different ways to estimate the maximum depositional age(MDA)of siliclastic rocks by means of detrital *** results show that among these methods three are positively and six negatively *** paper investigates the cause of these biases and proposes a solution to it.A simple toy example shows that it is theoretically impossible for the reviewed methods to find the correct depositional age in even a best case scenario:the MDA estimates drift to ever smaller values with increasing sample *** issue can be solved using a maximum likelihood model that was originally developed for fission track thermochronology by Galbraith and Laslett(1993).This approach parameterises the MDA estimation problem with a binary mixture of discrete and continuous ***‘Maximum Likelihood Age’(MLA)algorithm converges to a unique MDA value,unlike the ad hoc methods reviewed by Coutts et al.(2019).It successfully recovers the depositional age for the toy example,and produces sensible results for realistic *** is illustrated with an application to a published dataset of 13 sandstone samples that were analysed by both LA-ICPMS and CA-TIMS U–Pb *** ad hoc algorithms produce unrealistic MDA estimates that are systematically younger for the LA-ICPMS data than for the CA-TIMS *** MLA algorithm does not suffer from this negative *** MLA method is a purely statistical approach to MDA *** the ad hoc methods,it does not readily accommodate geological complications such as post-depositional Pb-loss,or analytical issues causing erroneously young *** best approach in such complex cases is to re-analyse the youngest grains using more accurate dating *** results of the MLA method are best visualised on radial *** the model and the plots have applications outside detrital geochronology,for example to determine volcanic e

关键词： Zircon U-Pb Geochronology Statistics Maximum depositional age

Isoplot R: A free and open toolbox for geochronology

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Geoscience Frontiers 2018年第5期9卷 1479-1493页

作者： pieter Vermeesch Department of Earth Sciences University College London

This paper reviews the basic principles of radiometric geochronology as implemented in a new software package called Isoplot R, which was designed to be free, flexible and future-proof. Isoplot R is free because it is written in non-proprietary languages(R, Javascript and HTML) and is released under the GPL license. The program is flexible because its graphical user interface(GUI) is separated from the command line functionality, and because its code is completely open for inspection and modification. To increase future-proofness, the software is built on free and platform-independent foundations that adhere to international standards, have existed for several decades, and continue to grow in *** R currently includes functions for U-Pb, Pb-Pb,40 Ar/39 Ar, Rb-Sr, Sm-Nd, Lu-Hf, Re-Os, U-Th-He,fission track and U-series disequilibrium dating. It implements isochron regression in two and three dimensions, visualises multi-aliquot datasets as cumulative age distributions, kernel density estimates and radial plots, and calculates weighted mean ages using a modified Chauvenet outlier detection criterion that accounts for the analytical uncertainties in heteroscedastic datasets. Overdispersion of geochronological data with respect to these analytical uncertainties can be attributed to either a proportional underestimation of the analytical uncertainties, or to an additive geological scatter *** R keeps track of error correlations of the isotopic ratio measurements within aliquots of the same samples. It uses a statistical framework that will allow it to handle error correlations between aliquots in the future. Other ongoing developments include the implementation of alternative user interfaces and the integration of Isoplot R with other data reduction software.

关键词： Geochronology Software Statistics

Developmental exposure to thyroid disruptors:misprogramming of the brain's stem cells in later life?

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Neural Regeneration Research 2023年第3期18卷 527-528页

作者： pieter Vancamp Sylvie Remaud Laboratory of Molecular Physiology and Adaptation CNRS UMR 7221Department Adaptations of LifeMuséum National d’Histoire NaturelleParisFrance

Introduction:Ever since the discovery of neural stem cells(NSCs)in the adult mammalian brain,scientists have been trying to decipher which signals govern their turnover and lineage commitment to generate neurons and *** their role in nervous tissue homeostasis can provide new insights into the etiology of several neurological disorders,and might one day be turned to our advantage to promote endogenous brain injury *** and we have identified thyroid hormone(TH)as a key factor transcriptionally regulating NSC behavior in the largest niche of the adult mammalian brain:the subventricular zone(SVZ).

关键词： endogenous homeostasis programming

Overcoming fixation:Shaping BPS to fit into design practice

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Building Simulation 2024年第7期17卷 1037-1041页

作者： pieter de Wilde Clarice Bleil de Souza Division of Energy and Building Design Lund UniversitySweden Welsh School of Architecture Cardiff UniversityUK

Problem definition The use of Building Performance Simulation(BPS)to support building design has long been the‘holy grail’of building science *** can also be used during construction and operation of buildings,for instance supporting rating and certification,optimal control,or fault emulation,but design support is particularly interesting as this is where the foundations for future building performance are *** underlying premise is that good predictions of future building performance can inform and improve design decision-making,and thus help to create buildings that are more energy efficient,more comfortable,and overall perform better than buildings that are designed without such *** on BPS for design support has been carried out since the emergence of building science as a separate area of research in the 1960s(Markus et al.1972;Clarke 2001;Maver 2002;Augenbroe et al.2004).

关键词： supporting design instance

TuLP: A Family of Lightweight Message Authentication Codes for Body Sensor Networks

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Journal of Computer Science & Technology 2014年第1期29卷 53-68页

作者：龚征 pieter Hartel Svetla Nikova 唐韶华朱博 School of Computer Science South China Normal University Faculty of Electrical Engineering Mathematics and Computer Science University of Twente Department of ESAT/SCD-COSIC Katholieke Universiteit Leuven IEEE School of Computer Science and Engineering South China University of Technology Department of Electrical and Computer Engineering University of Waterloo

A wireless sensor network （WSN） commonly whilst a body sensor network （BSN） must be secured with requires lower level security for public information gathering, strong authenticity to protect personal health information. In this paper, some practical problems with the message authentication codes （MACs）, which were proposed in the popular security architectures for WSNs, are reconsidered. The analysis shows that the recommended MACs for WSNs, e.g., CBC- MAC （TinySec）, OCB-MAC （MiniSec）, and XCBC-MAC （SenSee）, might not be exactly suitable for BSNs. Particularly an existential forgery attack is elaborated on XCBC-MAC. Considering the hardware limitations of BSNs, we propose a new family of tunable lightweight MAC based on the PRESENT block cipher. The first scheme, which is named TukP, is a new lightweight MAC with 64-bit output range. The second scheme, which is named TuLP-128, is a 128-bit variant which provides a higher resistance against internal collisions. Compared with the existing schemes, our lightweight MACs are both time and resource efficient on hardware-constrained devices.

关键词： message authentication code body sensor network low-resource implementation

What India Can Learn from China and Vice Versa

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China & World Economy 2007年第3期15卷 52-69页

作者： pieter Bottelier Johns Hopkins University

A partial convergence of the Indian and Chinese growth models is likely. Judging from China＇s experience, sustaining India＇s impressive economic performance of recent years will require a significant further opening of its economy （externally and internally）, higher savings and investments, especially in physical infrastructure and social services, and stronger labor absorption in the modern sectors. The base of India＇s current economic boom - software, IT-related services and high-end manufacturing - is narrow compared to China ＇s. Poor performance in agriculture is responsible for still significant poverty in many parts of rural lndia. Bilateral lndia-China ties, including trade and investment, are increasing rapidly and could help to bring about the structural economic changes India needs. Through its exports to China, lndia is becoming linked to global supply chains centered on China. The notion that India-China relations are, or are bound to become, fundamentally antagonistic, held by many in the USA, is mistaken and potentially dangerous.

关键词： comparative development economic liberalization India and China sustainable growth urban infrastructure.

Tuning thermal release kinetics of soy oil from organic nanoparticles using variable synthesis conditions

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Particuology 2016年第3期14卷 54-65页

作者： pieter Samyn Dieter Van Nieuwkerke Vibhore Rastogi Dirk Stanssens University of Freiburg Freiburg Research Institute for Advances Studies (FRIAS) Faculty for Environment and Natural Resources Chair of Bio-based Materials Engineering Werthmannstrasse 6 D-79085 Freiburg Germany Ghent University Department of Textiles Technologiepark 907 B-9052 Zwijnaarde Belgium Topehim N.K Nijverheidsstraat 98 B-2160 Wommelgem Belgium

The thermal release properties of soy oil from poly（styrene-co-maleimide） nanoparticles containing 50 wt% encapsulated oil have been quantified as a function of temperature and time. The effects of dif- ferent synthesis conditions on the thermal stability of the nanoparticles and their oil release have been evaluated, i.e., by gradually increasing the amount of ammonium hydroxide used for the imidization of poly（styrene-co-maleic anhydride）. First, the intrinsic thermal properties of the oil-filled nanoparti- cles were analysed by differential scanning calorimetry, which revealed an exothermal reaction related to the oil release and a suppression of the glass transition that may be masked owing to the complex structure of the hybrid nanoparticles. The isothermal scans showed different rates of oil release after a post-imidization reaction. The oil release was better followed by dynamic mechanical analysis, which illustrated changes in visco-elastic properties expressed by the maximum in the loss factor that related to the amount of released oil. Depending on the amount of ammonium hydroxide, the oil started to release below the glass transition temperature at various rates. Thermal release profiles of the oil we re quantified by infrared and Raman spectrocopy after heating for 2 min to 6 h at 125 to 250 ℃, based on variations in oil-related and imide-related absorption bands. The oil release increased below and above the glass transition temperature, following a parabolic trend, and progressively decreased at higher ammonium hydroxide concentrations, in parallel with higher imide content and changes in imide conformation. The kinetics and mechanism of the oil release can be described by the Korsmeyer-Peppas model, suggesting a dominating diffusion mechanism that is influenced by further imidization of the polymer matrix during heating.

关键词： Soy oil Nanoparticle Encapsulation Release

Extending the dynamic temperature range of Boltzmann thermometers

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Light(Science & Applications) 2022年第12期11卷 3069-3079页

作者： Thomas pieter van Swieten Jesse Merlijin Steenhoff Auke Vlasblom Ravi de Berg Sam pieter Mattern Freddy Teunis Rabouw Markus Suta Andries Meijerink Debye Institute for Nanomaterials Science Utrecht UniversityPrincetonplein 13584 CC UtrechtThe Netherlands Inorganic Photoactive Materials Heinrich Heine University DüsseldorfUniversitätsstraBe 140225 DüsseldorfGermany

Lanthanide-doped(nano)crystals are an important class of materials in luminescence *** working mechanism of these thermometers is diverse but most often relies on variation of the ratio of emission intensities from two thermally coupled excited states with *** low temperatures,nonradiative coupling between the states can be slow compared to radiative decay,but,at higher temperatures,the two states reach thermal equilibrium due to faster nonradiative *** thermal equilibrium,the intensity ratio follows Boltzmann statistics,which gives a convenient model to calibrate the ***,we investigate multiple strategies to shift the onset of thermal equilibrium to lower temperatures,which enables Boltzmann thermometry in a wider dynamic *** use Eu^(3+)-doped microcrystals as a model system and find that the nonradiative coupling rates increase for host lattices with higher vibrational energies and shorter lanthanide-ligand distances,which reduces the onset temperature of thermal equilibrium by more than 400 *** additionally reveal that thermometers with excited states coupled by electricdipole transitions have lower onset temperatures than those with magnetic-dipole-coupled states due to selection *** insights provide essential guidelines for the optimization of Boltzmann thermometers to operate in an extended temperature range.

关键词： equilibrium excited dynamic