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Microscopic assessment of the effect of saw-textured pinus radiata plywood surface on the distribution of a film-forming acrylic stain / Adya P. Singh in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 3, N° 3 (07/2006)
[article]
Titre : Microscopic assessment of the effect of saw-textured pinus radiata plywood surface on the distribution of a film-forming acrylic stain Type de document : texte imprimé Auteurs : Adya P. Singh, Auteur ; Bernard S. W. Dawson, Auteur Année de publication : 2006 Article en page(s) : P. 193-201 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Revêtements protecteurs
Conifères
Contreplaqué
Lasures
Microscopie
Morphologie (matériaux)
PolyacryliquesIndex. décimale : 667.9 Revêtements et enduits Résumé : The micro-morphology of the wood-coating interface of saw-textured Pinus radiata plywood panels, which had been coated with a film-forming stain, was examined using a range of microscopic techniques. The surface appearance and tissue deformation characteristics of saw-textured plywood and the pattern of distribution of the applied coating were observed by combined light, confocal, and scanning electron microscopy. The saw-textured surface was highly irregular, with surface tissues greatly distorted, being bent, twisted, and occasionally detached, and showing extensive cell wall cracking. The applied coating conformed closely to the contours of the saw-textured surface, resulting in a highly variable film thickness. The film was thickest in the grooves and thinnest over the ridges, and in places discontinuous, particularly where wood cells protruded out of the wood surface. These and other salient features of the surface of saw-textured plywood are discussed in relation to the pattern of the applied acrylic stain topcoat. DOI : 10.1007/BF02774508 En ligne : https://link.springer.com/content/pdf/10.1007%2FBF02774508.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3692
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 3, N° 3 (07/2006) . - P. 193-201[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 005076 - Périodique Bibliothèque principale Documentaires Disponible Microscopic revelations in sunscreen formulation / Afshan Nayyir-Mazhir in GLOBAL PERSONAL CARE, Vol. 25, N° 2 (02/2024)
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Titre : Microscopic revelations in sunscreen formulation Type de document : texte imprimé Auteurs : Afshan Nayyir-Mazhir, Auteur ; Helene Hine, Auteur ; Aline Souza, Auteur Année de publication : 2024 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dermo-cosmétologie
Emollients
Microscopie
Peau -- Soins et hygiène
Produits antisolaires
SolubilitéIndex. décimale : 668.5 Parfums et cosmétiques Résumé : Sunscreen formulations are complex and multi-component systems that are based on either organic UV filters, inorganic UV filters, or both. As formulators navigate the complexities of sunscreen development, Croda provides detailed insights into how microscopy can enhance the understanding of formulation microstructure, offering valuable information beyond what is visible to the naked eye. Note de contenu : - Timeframes for microscopic evaluation
- Slide preparation process
- Formulation insights, an overview
- Screening for incompatibilities
- Micelle size identification
- Appearance of mineral UV filters
- Agglomeration of mineral UV filters
- Other types of microscopy
- Crystallisation of solid organic UV filters
- Table 1 : Solubility study of Croda Emollients and organic UV filtersEn ligne : https://drive.google.com/file/d/1o6YkeWHLGOHayeVH2tZ-eEUILCJOhzVO/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40797
in GLOBAL PERSONAL CARE > Vol. 25, N° 2 (02/2024)[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24426 - Périodique Bibliothèque principale Documentaires Disponible Microscopy methods to study fat cells : Part 1 : characterisation of ovine cutaneous lipids using microscopy / V. L. Addy in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 1 (01-02/2001)
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Titre : Microscopy methods to study fat cells : Part 1 : characterisation of ovine cutaneous lipids using microscopy Type de document : texte imprimé Auteurs : V. L. Addy, Auteur ; Anthony D. Covington, Auteur ; D. A. Langridge, Auteur ; A. Watts, Auteur Année de publication : 2001 Article en page(s) : p. 6-15 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adipocytes
Cuirs et peaux -- Analyse
Cuirs et peaux de bovins
Histochimie
Lipides
MicroscopieIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Microscopy has been employed to study cutaneous lipids. In particular, light microscopy in conjunction with histochemical labelling techniques and confocal microscopy have been used to determine the chemical basis of the lipid moieties and provide qualitative information regarding the extent to which lipids are deposited within the skin substrate. Furthermore a range of electron microscopy techniques, including a novel cryo-scanning electron microscopy technique, have been used to resolve the structure of the fat cell substrate. Due to inter and intra skin variation, there are difficulties associated with using intact skin as a model for studying adipocytes. Subcutaneous adipose tissue was therefore utilized for studying the morphology of component adipocytes using microscopy. Note de contenu : - Preparation for light microscopy
- Histochemical staining methods
- Confocal microscopy
- Transmission electron microscopy
- Cryo-scanning electron microscopy
- Freeze fracture microscopyEn ligne : https://drive.google.com/file/d/10w3NoQnq4UMVOAKLzo4wis8XO0g8u-dz/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40588
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 85, N° 1 (01-02/2001) . - p. 6-15[article]Microscopy methods to study fat cells - Part 2 : Study of the interaction of ovine cutaneous adipocytes with lipase enzymes using microscopy / V. L. Addy in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 2 (03-04/2001)
[article]
Titre : Microscopy methods to study fat cells - Part 2 : Study of the interaction of ovine cutaneous adipocytes with lipase enzymes using microscopy Type de document : texte imprimé Auteurs : V. L. Addy, Auteur ; Anthony D. Covington, Auteur ; D. A. Langridge, Auteur ; A. Watts, Auteur Année de publication : 2001 Article en page(s) : p. 52-65 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adipocytes
Analyse morphologique
Cuirs et peaux -- Analyse
Cuirs et peaux de moutons
EnzymesUne enzyme est une protéine dotée de propriétés catalytiques. Pratiquement toutes les biomolécules capables de catalyser des réactions chimiques dans les cellules sont des enzymes ; certaines biomolécules catalytiques sont cependant constituées d'ARN et sont donc distinctes des enzymes : ce sont les ribozymes.
Une enzyme agit en abaissant l'énergie d'activation d'une réaction chimique, ce qui accroît la vitesse de réaction. L'enzyme n'est pas modifiée au cours de la réaction. Les molécules initiales sont les substrats de l'enzyme, et les molécules formées à partir de ces substrats sont les produits de la réaction. Presque tous les processus métaboliques de la cellule ont besoin d'enzymes pour se dérouler à une vitesse suffisante pour maintenir la vie. Les enzymes catalysent plus de 5 000 réactions chimiques différentes2. L'ensemble des enzymes d'une cellule détermine les voies métaboliques qui peuvent avoir lieu dans cette cellule. L'étude des enzymes est appelée enzymologie.
Les enzymes permettent à des réactions de se produire des millions de fois plus vite qu'en leur absence. Un exemple extrême est l'orotidine-5'-phosphate décarboxylase, qui catalyse en quelques millisecondes une réaction qui prendrait, en son absence, plusieurs millions d'années3,4. Comme tous les catalyseurs, les enzymes ne sont pas modifiées au cours des réactions qu'elles catalysent, et ne modifient pas l'équilibre chimique entre substrats et produits. Les enzymes diffèrent en revanche de la plupart des autres types de catalyseurs par leur très grande spécificité. Cette spécificité découle de leur structure tridimensionnelle. De plus, l'activité d'une enzyme est modulée par diverses autres molécules : un inhibiteur enzymatique est une molécule qui ralentit l'activité d'une enzyme, tandis qu'un activateur de cette enzyme l'accélère ; de nombreux médicaments et poisons sont des inhibiteurs enzymatiques. Par ailleurs, l'activité d'une enzyme décroît rapidement en dehors de sa température et de son pH optimums.
Histochimie
LipasesLes lipases sont des enzymes hydrosolubles capables d'effectuer l'hydrolyse de fonctions esters et sont spécialisées dans la transformation de triglycéride en glycérol et en acides gras (lipolyse). À ce titre, elles constituent une sous-classe des estérases.
Microscopie
Structure cellulaire (biologie)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In Part 1 of this series, a range of microscopy techniques used to study the morphology of the fat cell substrate was described, with a view to developing a better understanding of the degreasing process. This paper discusses how these techniques have been used to study the interaction between the ovine adipocyte substrate with lipid hydrolases. Microscopy has revealed that, under alkaline conditions, the triacylglycerol lipase is able to penetrate the fat cell to effect hydrolysis which is calcium dependent. A striking consequence of this reaction is the morphological changes associated with the adipocyte plasma membrane. These structural changes are thought to be due to the contraction of the plasma membrane, caused by the depletion of the intracellular lipid.
The effect of PLA, hydrolysis on the adipocyte substrate is significant, but mechanistically different to that seen with the triacylglycerol lipase. The deformation of the cell is targeted rather than pervasive, which implies that the phospholipids within the plasma membrane are being hydrolysed. causing pitting and localized deformation of the membrane.
These studies demonstrate that gross cellular changes are associated with the hydrolysis of ovine cutaneous adipocyte derived lipid. This is important evidence to suggest that lipid hydrolases can be used to target and hydrolyse ovine storage lipid.Note de contenu : - EXPERIMENTAL DETAILS : Cryo-scanning electron in microscopy - Transmission electron microscopy - Freeze fracture microscopy - Laser scanning confocal in microscopv - Phospholipase studies
- RESULTS : Study of the interaction of the lipase enzyme with the adipocyte substrate - 1-Histochemical labelling of free fatty acids - Cryo—scanning electron microscopy studies - Transmission electron microscopy studies - Freeze fracture microscopy studies - Confocal scanning microscopy - Phospholipase studies
- Table 1 : Adipocyle cellular structure and histochemical observations for the experimental conditions
- Table 2 : Adipocyte morphology after treating with lead ions to stain the fatty acidsEn ligne : https://drive.google.com/file/d/1wiW1JrOwLWuHDFpsZwszHJaA9KwKPMSx/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40413
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 85, N° 2 (03-04/2001) . - p. 52-65[article]Molecular interactions between type I collagen and metal complex : from computational modelling to experimental characterisation / Xiao Shiwei in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 4 (07-08/2018)
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Titre : Molecular interactions between type I collagen and metal complex : from computational modelling to experimental characterisation Type de document : texte imprimé Auteurs : Xiao Shiwei, Auteur ; Dan Nianhua, Auteur ; Wang Kangjian ; Juxia Gong ; Dan Weihua ; Hong Lin Année de publication : 2018 Article en page(s) : p. 174-180 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale
Analyse thermique
Caractérisation
Collagène
Complexes métalliques
Dynamique moléculaire
Microscopie
Modèles numériques
Morphologie (matériaux)
Stabilité thermique
ThermogravimétrieIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Computational modelling was used to construct the models of type I collagen and the Zr-AI-Ti complex, as well as simulating the interactions between them. Hydrogen bond and Van der Waals' forces exist between collagen and the Zr-Al-Ti complex. Furthermore, other bonding regions between central metal ions and O, N, H atoms were calculated. Furthermore, experimental characterisations were carried out to better verify the results of computational modelling, results showed that the spectra of FTIR, UV-DRS and fluorescence were all shifted to some extent. Specifically, UV-DRS and fluorescence detection suggested that the alteration appeared around aromatic residues, tyrosine and phenylalanine. Further, XPS proved that the N atom showed a higher possibility of coordinating with the metal complex than did O. Accompanied with DSC and TG detections, it has been confirmed that the interactions brought by Zr-Al-Ti complex gave rise to the increase of denaturation temperature of collagen from 66.51°C to 88.1°C. In addition, results obtained from SEM and AFM show It is obvious that the original collagen fibre has been changed into a tight layer by layer structure, and it could be observed that metal complex particles filled in between collagen fibres ,this together with strong chemical bonding between them, finally stabilized the structure of collagen. Note de contenu : - EXPERIMENTAL PROCEDURES : Reagents and chemicals - Computational modeling - Optimisation of reaction between collagen and Zr-Al-Ti complex - Free amino content - Free carboxyl content - Fourrier transformed intrared spectroscoy (FTIR) - Diffused reflectance spectrum (UV-DRS) - Fluorescence spectrum - X-ray photoelectron spectroscopy (XPS) - Differential scanning calorimetry (DSC) and thermogravimetry (TG) - Scanninc electron microscopy (SEM) - Atomic force microscopy (AFM)
- RESULTS AND DISCUSSION : Computational modeling - Modification degree - Spectrum analysis - XPS analysis - Thermal stability - MorphologyEn ligne : https://drive.google.com/file/d/1o3e0lqalQCBbpE3iChLxMEBDI0WVh_Oz/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30899
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 102, N° 4 (07-08/2018) . - p. 174-180[article]Réservation
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