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Relationship between skin fungal and bacterial microbiomes and skin pH / Narifumi Akaza in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 45, N° 3 (06/2023)
[article]
Titre : Relationship between skin fungal and bacterial microbiomes and skin pH Type de document : document électronique Auteurs : Narifumi Akaza, Auteur ; Kazuto Takasaki, Auteur ; Takahiro Matsudaira, Auteur ; Atsuko Usui, Auteur ; Anna Iijima, Auteur ; Shiori Miura, Auteur ; Youichi Yashiro, Auteur Année de publication : 2023 Article en page(s) : p. 362-372 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cutibactéries
Dermatologie
Japonais
Malassezia
Microbiome cutané
Perte insensible en eau
pH
StaphylocoquesIndex. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective :The present study investigated the relationship between the skin bacterial and fungal microbiomes and skin pH at sebaceous sites, namely, the forehead, cheek and upper chest. We also examined the relationship between the skin microbiome and transepidermal water loss (TEWL), which is an indicator of rough skin.
- Methods : Thirty healthy Japanese subjects (15 females and 15 males) were enrolled as subjects. The forehead, cheek and upper chest were examined in August (summer) and February (winter). Skin surface samples were collected using the swab method, and the 16s rRNA and ITS regions were analysed using next-generation sequencing. Skin pH and TEWL were also assessed.
- Results : The changes observed in the skin microbiome were associated with season-dependent changes in skin pH. An increase in skin pH at the forehead and cheek was associated with a higher relative abundance of Cutibacterium spp., a reduction in bacterial diversity, and a lower relative abundance of Staphylococcus spp. A decrease in skin pH at the upper chest was associated with a higher relative abundance of Malassezia restricta, a lower relative abundance of M. sympodialis and decrease in fungal diversity. Moreover, these changes were also associated with an increase in TEWL.
- Conclusion : The present results indicate that changes in skin pH are associated with changes in the skin bacterial and fungal microbiomes at sebaceous sites. The changes observed in the skin microbiome were also associated with rough skin.Note de contenu : - METHODS : Subjects - Skin measurements - Sample collection of cutaneous microorganisms - DNA extraction - Next-generation sequencing - Data analysis - Statistical analysis
- RESULTS : Skin condition - Seasonal changes in the skin microbiome - Correlations between skin condition and cutaneous microorganismsDOI : https://doi.org/10.1111/ics.12842 En ligne : https://drive.google.com/file/d/11QTqxob_qrXoxvujR4BpLJWXi2hjYjJL/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39567
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 45, N° 3 (06/2023) . - p. 362-372[article]Removal of chromium (III) from tannery wastewaters with acidophilic fungi / Joana Lalueza in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 1 (01/2014)
[article]
Titre : Removal of chromium (III) from tannery wastewaters with acidophilic fungi Type de document : texte imprimé Auteurs : Joana Lalueza, Auteur ; Rita Puig, Auteur ; Antoni Ruis, Auteur ; Elena Martí, Auteur ; Joan F. Martí, Auteur ; Núria Rodríguez, Auteur ; Ricardo Amils, Auteur Année de publication : 2014 Article en page(s) : p. 14-24 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption
Bases (chimie)
Biotechnologie
Champignons et constituants
Chrome trivalent
Chrome trivalent -- Absorption
Eaux usées -- Décontamination
Eaux usées -- Epuration
Eaux usées -- Recyclage
pHIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Conventional methods for chromium removal from industrial effluents may be limited by technological or economical constraints, especially when they are applied to dilute metal solutions. Thus, biotechnological processes, which are efficient at low metal concentrations and require the use of fewer chemicals, may play an important role. The chromium recovery proposed here is based on the specific uptake of this metal by acidophilic fungi. Fifty acidophilic fungal isolates from the Río Tinto basin, an extreme acidic environment, were tested. Most of them were resistant to Cr(III) and Cr(VI) solutions at concentrations up to 10 mmol/L. The influence of different experimental conditions was evaluated (medium concentration, kinetics, requirement of induction etc.). Fungal isolate 143 was able to remove 63% of Cr(III) at 0.1 mmol/L, 74% at 1 mmol/L and 21% at 10 mmol/L. These are the best Cr(III)-fungal-uptake results at acidic pH described in the literature so far. It should be possible to use these acidophilic fungi, for example in tannery wastewater, as they can resist chromium concentrations and pH values found in these effluents (between 6.5-7.5 mmol/L Cr (III) and pH as low as 3-4). Note de contenu : - EXPERIMENTAL SECTION : Conservation of the fungal isolates - Procedure to test the resistance and uptake capacity of fungal isolates : Resistance - Uptake capacity.
- RESULTS AND DISCUSSION : Resistance to Cr(III) and Cr (VI) profile of 50 acidic fungal isolates - Characterization of tannery wastewater - Systematic screening of resistance and specific uptake of Cr(III) - Cr(III) uptake tests with fungal isolates 128 and 143 : Experiments with different concentration of Yepd growth media - ph variation over time - Uptake kinetics. - Comparison of Results with those describedin the literatureEn ligne : https://drive.google.com/file/d/1O9XZmB4lRuhBnsLjCVSdvhUVyMd7aZ5n/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20139
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIX, N° 1 (01/2014) . - p. 14-24[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15863 - Périodique Bibliothèque principale Documentaires Disponible Role of pH in skin cleansing / Stacy Hawkins in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 43, N° 4 (08/2021)
[article]
Titre : Role of pH in skin cleansing Type de document : document électronique Auteurs : Stacy Hawkins, Auteur ; Bivash R. Dasgupta, Auteur ; Kavssery P. Ananthapadmanabhan, Auteur Année de publication : 2021 Article en page(s) : p. 474-483 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dermo-cosmétologie
Douceur (toucher)
Formulation (Génie chimique)
Hydratation
Justification de l'allégation
Peau -- Nettoyage
Peau -- Soins et hygiène
pHIndex. décimale : 668.5 Parfums et cosmétiques Résumé : - Background : The importance of maintaining the acid-mantle of human stratum corneum to maintain its healthy barrier and skin’s biological functions such as desquamation and lipid biosynthesis is well recognized in the literature. An outcome of this has been an increase in the number of skincare products formulated at or near the skin pH with an implication that a product formulated at skin pH will be good for skin. Such an assumption often does not take into account the specific interactions of ingredients in the product with the stratum corneum under skin pH conditions.
- Objective : The objective of this research was to determine whether a skin cleansing product by virtue of its pH being same as "skin pH" is milder to skin.
- Methods : A well established Forearm Controlled Application Test (FCAT) protocol was used in clinical studies to compare “skin pH” cleansing systems with neutral pH cleansing systems. Specifically, certain commercially available “skin pH” cleansing bars were compared with a neutral pH syndet bar in two separate FCAT studies. Since these bars differed in their surfactant composition, in a separate FCAT study, two identical prototype bar formulations differed only in their pH were compared. Additionally, two body wash liquid prototypes, identical in composition but differing only in their pH were also compared in another FCAT study.
- Results : The results obtained showed that skin-cleansing systems formulated solely or predominantly with anionic surfactants under skin pH conditions can result in increased skin dryness and irritation compared to those under neutral pH conditions. The results are explained in terms of the increased electrostatic interaction of anionic surfactants with stratum corneum under low pH conditions compared to neutral pH conditions.
- Conclusion : Skin-cleansing systems formulated solely or predominantly with anionic surfactants under skin pH conditions can result in increased skin dryness and irritation compared to those under neutral pH conditions. Any skin cleansing product by virtue of its pH being same as that of "skin pH" does not guarantee that it will be good for skin. The mildness of a cleanser will be determined by the interactions of its surfactants and other ingredients with stratum corneum under its formulated pH conditions.Note de contenu : - BACKGROUND : Stratum corneum pH and biological processes in skin - pH and skin cleansing
- METHODS AND MATERIALS : Materials - Methods
- RESULTS : Effect of pH of an acidic syndet bar compared to a neutral pH syndet bar in forearm controlled application test (FCAT) - Effect of pH of two acidic syndet bars with a neutral pH syndet bar in forearm controlled application test (FCAT) - Effect of pH of two SLES 1 EO based body
wash formulations in FCAT
- Table 1 : Products used in the present investigationDOI : https://doi.org/10.1111/ics.12721 En ligne : https://drive.google.com/file/d/1w4OzfTC5uVl8qUbROigHCN6SUcEwkxe0/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36683
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 43, N° 4 (08/2021) . - p. 474-483[article]Salt-pH effects on collagen thermal stability in pickling and curing / A. E. Russel in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 59 (Année 1975)
[article]
Titre : Salt-pH effects on collagen thermal stability in pickling and curing Type de document : texte imprimé Auteurs : A. E. Russel, Auteur Année de publication : 1975 Article en page(s) : p. 6-13 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bases (chimie)
Collagène
Halogénures
pH
Stabilité thermique
SulfatesLe sulfate est le sel de l'acide sulfurique H2SO4. La formule de l'ion sulfate est SO42-.Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Effects of alkali halides and sulphates on thermal stability of insoluble and precipitated fibrous collagens have been examined in the acid-to-neutral pH range. The salt-pH levels studied corresponded to the range of conditions encountered from acid pickling to saturated brine curing. Fluoride and chloride salts stabilised collagen whereas the bromides and iodides tented to stabilise at low concentrations in acid solution only, but were structural destabilisers at high concentration. Halide effects were strongly pH-dependent and a feature of the results was the relatively small increase in collagen stability in saturated sodium chloride at neutral pH (curing conditions) compared with the large stability increase found at saturation at acid pH. Alkali sulphates on the other hand, stabilised fibrous collagen substantially at all pH levels. Assuming that an increase in heat stability of collagen is also correlated with incresed resistance to bacterial attack, the results suggest that curing in acidified brine offers additional protection. In addition, salt concentration in acid medium can be substantially decreased without affecting the excess stability in collagen. Practical implications of these results are discussed with reference to the problem of salt reduction in curing and the use of sulphates as penetration assistants in Mimosa cure and rapid vegetable tannage. Note de contenu : - EXPERIMENTAL : Materials - Measurement of thermal stability
- DISCUSSION : Salt-pH interactions in curing and pickling - Dry salt curing - Drum brining - Alkali sulphate effects on collagen stabilityEn ligne : https://drive.google.com/file/d/18d5da53f-G1PlxshtuMMV7m-aC4L1LqN/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31041
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 59 (Année 1975) . - p. 6-13[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008595 - Périodique Archives Documentaires Exclu du prêt Salt-pH effects on collagen thermal stability in pickling and curing / A. E. Russel in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 59, N° 1 (01-02/1975)
[article]
Titre : Salt-pH effects on collagen thermal stability in pickling and curing Type de document : texte imprimé Auteurs : A. E. Russel, Auteur Année de publication : 1975 Article en page(s) : p. 6-13 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bases (chimie)
Collagène
Halogénures
pH
Stabilité thermique
SulfatesLe sulfate est le sel de l'acide sulfurique H2SO4. La formule de l'ion sulfate est SO42-.Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Effects of alkali halides and sulphates on thermal stability of insoluble and precipitated fibrous collagens have been examined in the acid-to-neutral pH range. The salt-pH levels studied corresponded to the range of conditions encountered from acid pickling to saturated brine curing. Fluoride and chloride salts stabilised collagen whereas the bromides and iodides tented to stabilise at low concentrations in acid solution only, but were structural destabilisers at high concentration. Halide effects were strongly pH-dependent and a feature of the results was the relatively small increase in collagen stability in saturated sodium chloride at neutral pH (curing conditions) compared with the large stability increase found at saturation at acid pH. Alkali sulphates on the other hand, stabilised fibrous collagen substantially at all pH levels. Assuming that an increase in heat stability of collagen is also correlated with incresed resistance to bacterial attack, the results suggest that curing in acidified brine offers additional protection. In addition, salt concentration in acid medium can be substantially decreased without affecting the excess stability in collagen. Practical implications of these results are discussed with reference to the problem of salt reduction in curing and the use of sulphates as penetration assistants in Mimosa cure and rapid vegetable tannage. Note de contenu : - EXPERIMENTAL : Materials - Measurement of thermal stability
- DISCUSSION : Salt-pH interactions in curing and pickling - Dry salt curing - Drum brining - Alkali sulphate effects on collagen stabilityEn ligne : https://drive.google.com/file/d/18d5da53f-G1PlxshtuMMV7m-aC4L1LqN/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31858
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 59, N° 1 (01-02/1975) . - p. 6-13[article]Réservation
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