scholarly journals Comparison of protocols measuring diffusion and partition coefficients in the stratum corneum

2017 ◽  
Vol 37 (7) ◽  
pp. 806-816 ◽  
Author(s):  
H. Rothe ◽  
C. Obringer ◽  
J. Manwaring ◽  
C. Avci ◽  
W. Wargniez ◽  
...  
Keyword(s):  
Stratum Corneum ◽  
Partition Coefficients

Changes in corneocyte element concentrations occur in skin inner stratum corneum

1990 ◽  
Vol 48 (2) ◽  
pp. 146-147
Author(s):  
R. R. Warner
Keyword(s):  
Stratum Corneum ◽  
Human Skin ◽  
Element Concentration ◽  
Skin Barrier ◽  
Barrier Properties ◽  
Brick Wall ◽  
Inorganic Elements ◽  
Dry Skin ◽  
Skin Biopsies ◽  
Intercellular Lipid

Keratinocytes undergo maturation during their transit through the viable layers of skin, and then abruptly transform into flattened, anuclear corneocytes that constitute the cellular component of the skin barrier, the stratum corneum (SC). The SC is generally considered to be homogeneous in its structure and barrier properties, and is often shown schematically as a featureless brick wall, the “bricks” being the corneocytes, the “mortar” being intercellular lipid. Previously we showed the outer SC was not homogeneous in its composition, but contained steep gradients of the physiological inorganic elements Na, K and Cl, likely originating from sweat salts. Here we show the innermost corneocytes in human skin are also heterogeneous in composition, undergoing systematic changes in intracellular element concentration during transit into the interior of the SC.Human skin biopsies were taken from the lower leg of individuals with both “good” and “dry” skin and plunge-frozen in a stirred, cooled isopentane/propane mixture.

Paracrystalline Aggregates of Psoriatic Keratin and Their Relation to Normal Keratin Structure

1985 ◽  
Vol 43 ◽  
pp. 680-681
Author(s):  
S. Trachtenberg ◽  
P.M. Steinert ◽  
B.L. Trus ◽  
A.C. Steven
Keyword(s):  
Cell Death ◽  
Stratum Corneum ◽  
Intermediate Filament ◽  
Skin Disease ◽  
Amorphous Matrix ◽  
Terminal Differentiation ◽  
Proteolytic Degradation ◽  
Horny Layer ◽  
Chronic Skin ◽  
Chronic Skin Disease

During terminal differentiation of vertebrate epidermis, certain specific keratin intermediate filament (KIF) proteins are produced. Keratinization of the epidermis involves cell death and disruption of the cytoplasm, leaving a network of KIF embedded in an amorphous matrix which forms the outer horny layer known as the stratum corneum. Eventually these cells are shed (desquamation). Normally, the processes of differentiation, keratinization, and desquamation are regulated in an orderly manner. In psoriasis, a chronic skin disease, a hyperkeratotic stratum corneum is produced, resulting in abnormal desquamation of unusually large scales. In this disease, the normal KIF proteins are diminished in amount or absent, and other proteins more typical of proliferative epidermal cells are present. There is also evidence of proteolytic degradation of the KIF.

Rätselhafte Bläschen an Händen und Mundschleimhaut bei einem 15 Monate alten Mädchen: Intoxikation durch Dieselöl

2005 ◽  
Vol 5 (03) ◽  
pp. 141-143
Author(s):  
Andreas Merkenschlager ◽  
Matthias Bernhard
Keyword(s):  
Stratum Corneum

ZusammenfassungAkzidentelle Vergiftungen ereignen sich am häufigsten im Kleinkindesalter. Der weit verbreitete Gebrauch von aliphatischen Hydrokarbonen wie Dieselöl begünstigt Intoxikationen. Die Ingestion von Dieseltreibstoff birgt insbesondere die Gefahr einer Aspirationspneumonie. Akute Hauttoxizität ist hingegen selten.Ein 15 Monate altes Mädchen entwickelte nach vorausgegangenem Erbrechen und einer mehrere Stunden andauernden Lethargie innerhalb von 24 Stunden zahlreiche bläschenartige Hautläsionen, die teilweise ulzeriert waren, an den Fingern, der Handinnenfläche sowie perioral. Die Wangen- und Gaumensegelschleimhaut zeigten mehrere kleine Ulzera, die weißlich belegt und hämorrhagisch waren. Zunächst wurde eine Hand-Fuß-Mund-Krankheit vermutet. Durch ausführliche Anamnese konnte jedoch festgestellt werden, dass das Kind am Tag zuvor in einem Sandkasten gespielt hatte, der durch ein Leck in einem daneben stehenden Dieselöltank kontaminiert gewesen war. Eine pulmonale oder hepatische Beteiligung konnte nicht nachgewiesen werden. Die Läsionen heilten vollständig unter antiseptischen Verbänden innerhalb einer Woche ab.Man nimmt an, dass Dieselöl primär das Stratum corneum der Haut schädigt. Kinder sind aufgrund ihrer gegenüber Erwachsenen dünneren Hornhaut gefährdeter. In seltenen Fällen können sich Vesikel, Ulzera und Hämorrhagien entwickeln, die mit Infektionskrankheiten verwechselt werden können.Unstimmigkeiten bei klinischen Befunden sollten insbesondere bei Kleinkindern immer an mögliche Intoxikationen denken lassen.

Partition Coefficient Ratios and Tumour Perfusion Studied with 85mKr and 133Xe

1987 ◽  
Vol 26 (06) ◽  
pp. 253-257
Author(s):  
M. Mäntylä ◽  
J. Perkkiö ◽  
J. Heikkonen
Keyword(s):  
Partition Coefficient ◽  
Partition Coefficients ◽  
Regional Blood Flow ◽  
Blood Perfusion ◽  
Compartmental Analysis ◽  
Malignant Tumour ◽  
Mean Value ◽  
Perfusion Rate ◽  
Biological Variables ◽  
The Mean

The relative partition coefficients of krypton and xenon, and the regional blood flow in 27 superficial malignant tumour nodules in 22 patients with diagnosed tumours were measured using the 85mKr- and 133Xe-clearance method. In order to minimize the effect of biological variables on the measurements the radionuclides were injected simultaneously into the tumour. The distribution of the radiotracers was assumed to be in equilibrium at the beginning of the experiment. The blood perfusion was calculated by fitting a two-exponential function to the measuring points. The mean value of the perfusion rate calculated from the xenon results was 13 ± 10 ml/(100 g-min) [range 3 to 38 ml/(100 g-min)] and from the krypton results 19 ± 11 ml/(100 g-min) [range 5 to 45 ml/(100 g-min)]. These values were obtained, if the partition coefficients are equal to one. The equations obtained by using compartmental analysis were used for the calculation of the relative partition coefficient of krypton and xenon. The partition coefficient of krypton was found to be slightly smaller than that of xenon, which may be due to its smaller molecular weight.

Temperature Dependence of the Self-Assembled Styrene Based Random Ionomers in Aqueous Solution

2003 ◽  
Vol 775 ◽  
Author(s):  
Sung-Hwa Oh ◽  
Ju-Myung Song ◽  
Joon-Seop Kim ◽  
Hyang-Rim Oh ◽  
Jeong-A Yu
Keyword(s):  
Partition Coefficients ◽  
Room Temperature ◽  
Aqueous Media ◽  
The Self ◽  
Spectroscopic Methods ◽  
Ion Content ◽  
Repeat Units ◽  
Notable Effect ◽  
Order Of Magnitude ◽  
Experimental Errors

AbstractSolution behaviors of poly(styrene-co-sodium methacrylate) were studied by fluorescence spectroscopic methods using pyrene as a probe. The mol% of methacrylate was in the range 3.6–9.4. Water and N,N-dimethylforamide(DMF) mixture was used as a solvent (DMF/water = 0.2 mol %). The critical micelle (or aggregation) concentrations of ionomers and the partition coefficients of pyrene were obtained the temperature range 10–80°C. At room temperature, the values of CMCs (or CACs) were in the range 4.7 ×10-6 5.3 ×10-6 g/mL and we could not find any notable effect of the content of ionic repeat units within the experimental errors. Unlike CMCs, as the ion content increased, partitioning of pyrene between the hydrophobic aggregates and an aqueous media decreased from 1.5 ×105 to 9.4 ×104. As the temperature increased from 10 to 80 °C, the values of CMCs increased less than one order of magnitude. While, the partition coefficients of pyrene decreased one order of magnitude and the effect of the ion content became negligible.

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