GLORIA

GEOMAR Library Ocean Research Information Access

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 99 (1978), S. 0 
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: In 4 cases of allergic vasculitis circulating immune complexes (IC) were demonstrated. Spontaneous and histamine induced vascular changes were studied by immunofluorescence microscopy. The early events in IC vasculitis were investigated at the ultrastructural level by immunoelectronmicroscopy using the peroxidase-antiperoxidase multistep technique.Our findings support the concept that human IC vasculitis is triggered by the deposition of circulating IC in the walls of postcapillary venules between endothelial cells, pericytes and the layers of the basal lamina. Tissue destruction is only secondary due to local complement activation and the release of lysosomal enzymes from chemotactically attracted leukocytes.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 96 (1977), S. 0 
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Histochemical and electron microscopic studies were carried out on the newborn mouse model of the staphylococcal scalded skin syndrome to investigate the mechanism of action of the staphylococcal epidermolytic toxin that causes it. Histochemical studies showed that an intra-epidermal split develops below the subcorneal zone which is rich in catabolic enzymes (the so-called esterase-acid phosphatase-rich band). However, histochemical alterations in the enzyme pattern could not be demonstrated. The earliest change revealed by electron microscopy was a widening of the intercellular space, with the formation of microvilli at the level between the stratum spinosum and stratum granulosum where the split later occurs. A clearing of the peripheral cytoplasm along the cell membranes was also revealed. In pre-split areas, adhesion between cell membranes of adjacent cells seems to be lost; desmosomes continue to hold the cells together but the split develops when these are broken by mechanical pressure. Later, damaged cell membranes may be seen. Extracellular keratinosomes remain unchanged.Although these findings do not agree with the already divergent results of other studies, they help support the findings of all groups that cases of the Lyell syndrome produced by staphylococci do not occur through necrolysis; it is therefore inappropriate to continue applying the term ‘toxic epidermal necrolysis’ to such cases.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Skin research and technology 2 (1996), S. 0 
    ISSN: 1600-0846
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background/aims: Quantitative measurement of skin roughness has proved to be a valuable tool in the efficacy-control of external applications, but it suffers from not yielding easily comparable results. The most important sources of inter-observer variability are high-pass filters used to separate roughness and waviness, and low-pass filters which result from the finite resolution of the instrument or from the finite sampling interval of digital measurement. In the present study, the effects of high-pass filters and sampling intervals on the roughness measured were investigated.Methods: Dynamically focusing optical profilometry was used to measure the surfaces of negative replicas of healthy human skin. High-pass cut-off wavelengths and sampling intervals were varied systematically.Results/conclusions: Virtually unbiased estimates for the roughness parameters K, Sk, Rq, and Ra can be obtained using sampling intervals of 40 or even 80 μm. Regarding these roughness parameters, it is far better to do more scans than to shorten the sampling interval. The roughness parameters Rz, Rp, Rt, Rpm, Rmax, Pt, on the other hand are very sensitive to the influence of the sampling interval; to achieve satisfying estimates, the sampling interval should be no longer than 2 to 5 urn; as an important parameter’of the measurement, it is worthy of remark and should always be indicated. The way the mean square roughness Rq depends on the cut-off wavelength is not well described by the Sayles-Thomas-relation Rq∼λc0.5. If the power-spectrum |h*(v)|2 approximates sufficiently to a power law, |h*(v)|2∼vδ, a better estimate is given by Rq∼λcγ with γ=-(δ+1)/2. In many cases, γ=1 or Rq∼λc will suffice.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 1600-0846
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background/aims: The mainstays of the clinical diagnosis of melanoma are asymmetry, border irregularity, color variegation, and a diameter 〉6 mm, and any major progress in diagnostic accuracy will probably be related to the development of additional criteria. Such independent criteria might arise from the study of the geometry of the tumour surface, because this quality has been substantially disregarded until now. Our work is aimed at utilizing the surface topography for the differential diagnosis between malignant melanoma and naevocytic naevus.Methods: Dynamically focusing optical profilometry was used to measure the surfaces of negative replicas of melanocytic skin tumours and of the surrounding normal skin. 21 silicone imprints of superficial spreading melanomas and 25 imprints of naevocytic naevi were examined.Results: Melanomas and naevi differed with respect to a variety of statistical surface parameters, and a linear discriminant analysis correctly allocated 19 out of 21 melanomas (90%) and 21 out of 25 naevi (84%). To get an unbiased estimate of the errors to be expected with this classification rule, we calculated bootstrap-corrections to the apparent errors. Estimated probabilities of correct allocation were 84.1% for melanomas and 77.1% for naevi.Conclusion: Our findings suggest that simple statistical parameters of surface topography can differentiate effectively between malignant melanomas and naevocytic naevi.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cutaneous pathology 24 (1997), S. 0 
    ISSN: 1600-0560
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Cell adhesion between surfaces of cells and to extracellular matrices represents a fundamental mechanism in tissue organization and influences the biological behaviour and the architecture of tumors. We investigated the expression of various adhesion molecules in normal skin (n=5), nevi (n=29), and malignant melanoma (n=10) by immunohistochemistry. Special attention was paid to the correlation between adhesion molecule expression and the respective architectural features, e.g. UV-induced morphological changes, and the arrangement of melanocytes in congenital nevi. In nevi, a single erythemagenic close of UV-light did not influence the influence expression of melanocytes, but results in an upregulation of α3β1- and α6β1-integrin within the suprabasal layers of the epidermis. This suprabasal labelling was associated with an increased number of suprabasal melanocytes in UV-irradiated nevi which were detected with HMB-45 antibody. Nine of 10 congenital nevi demonstrated a labelling of α4β1-integrin only in melanocytes of the deeper dermis. This integrin previously has been associated with high tumor thickness and the clinical outcome in melanomas. The integrin profile observed in melanomas differed in part from that seen in nevi with expression of β2-and β3-integrins in some cases. The results may indicate a correlation between adhesion molecule expression and histopathological findings in melanocytic lesions.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 1432-1912
    Keywords: Key words Basophil ; Immunoglobulin E ; Histamine ; Interleukin-4 ; Interleukin-13 ; Theophylline ; β2-agonists H1-receptor antagonists
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Human basophils have recently been shown to rapidly produce and release interleukin (IL-)4 and IL-13 as well as histamine and eicosanoids. Since both IL-4 and IL-13 can initiate and maintain late phase allergic reactions we addressed whether some widely used anti-allergic drugs can inhibit the anti-IgE induced release of these cytokines from enriched human basophils. Basophils were enriched (47–92% purity) by Ficoll density centrifugation followed by elutriation and negative selection of contaminating cells using immunomagnetic beads. Basophils were stimulated with sub-optimal dilutions of anti-IgE in the presence or absence of various drugs and the release of histamine and cytokines were measured after 30 min and 4 h, respectively. The β-2 agonist salmeterol, the H1-receptor antagonist terfenadine and the phosphodiesterase inhibitor theophylline inhibited the release of IL-4 and IL-13 by more than 50% following 4 h of basophil stimulation with anti-IgE. These drugs also inhibited the release of histamine following 30 min stimulation, although with less efficacy than for IL-4 and IL-13. Short preincubation of basophils with salmeterol or terfenadine before stimulation gave rise to significantly greater inhibition of histamine release but had less effect on the inhibition of cytokine release. The effects of theophylline, however, were not significantly affected by preincubation of the cells with the drug. In contrast to the aforementioned drugs, salbutamol and cetirizine were ineffective at inhibiting both histamine and cytokine release from basophils. These results suggest that a number of anti-allergic drugs may mediate their effects, in part, in reducing late phase allergic responses due to their actions on IL-4 and IL-13 secretion from basophils.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 247 (1973), S. 145-160 
    ISSN: 1432-069X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung 1. Als „Fremdzellacantholyse“ wird eine besondere Form von Mikroacantholyse unter dem Einfluß von Infiltratzellen in der Epidermis (Exocytose) bezeichnet. Dabei kommt es zum Verlust einzelner Desmosomen oder zum Verlust der desmosomalen Kontakte in einem umschriebenen Bezirk der Zelloberfläche individueller Keratinocyten mit Umorientierung des Tonofilamentsystems. 2. Unter Exocytose im weiteren Sinn wird die Einwanderung aller „Fremdzellen“ in die Epidermis verstanden; in Frage kommen sowohl Entzündungszellen (z. B. Lymphocyten, Makrophagen, Granulocyten) als auch „neoplastische“ Zellen (z. B. bei Morbus Paget, M. Dubreuilh, Histiocytosis X). 3. Bei Annäherung von Fremdzellen an die dermo-epidermale Kontaktzone kommt es zunächst zur Desintegration der Basalmembran, dann zur Eröffnung von Lücken zwischen benachbarten Basalzellen, die sich nach Durchtritt einzelner oder Gruppen von Fremdzellen wieder durch zungenförmige Basalzellausläufer von beiden Seiten her schließen. 4. Desmosomen lösen sich während diese Vorganges ohne Zeichen mechanischer Abrisse auf, gleichzeitig orientiert sich das Desmosonen-Tonofilament-System laufend in der funktionell erforderlichen Weise um. Fremdzellen können aktiv und passiv (transepidermale Elimination) in die höheren Epidermisschichten gelangen. 5. Die Fremdzellacantholyse ist unabhängig von einer in vielen Fällen gleichzeitig bestehenden Spongiose (Mikroacantholyse infolge eines intercellulären Ödems). Unter bestimmten Bedingungen kann es zu einer Art von Symbiose zwischen Epidermiszellen und Fremdzellen kommen. 6. Morphologische Zeichen einer Schädigung der Epidermiszellen treten in Abhängigkeit von der Art und Dichte der Exocytose und etwaiger sonstiger Noxen in unterschiedlichem Schweregrad auf und können bis zur Nekrose gehen. 7. Das Phänomen der Fremdzellacantholyse stellt eine weiter Stütze für die bereits weithin akzeptierte Hypothese dar, daß Desmosomen und Tonofilamente keine starren Strukturen, sondern ein in ständigem funktionellem Wandel befindliches System darstellen.
    Notes: Summary 1. “Foreign cell acantholysis” is defined as a special type of microacantholysis that occurs in the epidermis in the course of exocytosis. Characteristic is the loss of single desmosomes or the loss of desmosomal contacts in limited areas of the surface of individual keratinocytes, and the concomitant rearrangement of the tonofilament system. 2. Exocytosis in the widest sense is the immigration of all “foreign cells” into the epidermis; these foreign cells may be inflammatory (e.g., lymphocytes, macrophages, granulocytes) or “neoplastic” (e.g., in Paget's, Dubreuilh's diseases, histiocytosis X). 3. With the approach of foreign cells to the dermo-epidermal junction, desintegration of the basement membrane takes place first, followed by the opening of a gap between neighbouring basal cells. The gap is closed after the penetration of single or a group of foreign cells by the projection of tongue-like processes of the basal cells from both sides. 4. The desmosomes are opening during this process without any signs of mechanical rupture, and at the same time the desmosome-tonofilament system changes continuously in the functionally optimal way. Foreign cells may get into the upper epidermal layers either by active migration or by passive transport (transepidermal elimination). 5. The foreign cell acantholysis is independent of spongiosis (microacantholysis caused by intercellular edema) which in many cases exists at the same time. Under special conditions “symbiosis” between epidermal and foreign cells may develop. 6. Morphological signs of epidermal cells damage may appear depending on the type and density of exocytosis and eventual other noxes. 7. The phenomenon of foreign cell acantholysis gives further support to the widely accepted hypothesis that desmosomes and tonofilaments are no static structures but a system undergoing continuous functional changes.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 248 (1974), S. 297-314 
    ISSN: 1432-069X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung 1. Hautveränderungen bei Lupus erythematodes discoides wurden elektronenmikroskopisch-cytochemisch unter Verwendung Perosidasemarkierter Antikörper untersucht. 2. Aggregate von Human-Gammaglobulin konnten bei Lupus erythematodes discoides in der dermo-epidermalen Verbundzone unterhalb der Basallamina nachgewiesen werden. 3. Aggregate von Human-Gammaglobulin wurden außerdem in subendothelialen Bezirken kleiner Blutgefäße nachgewiesen. 4. Aggregate von Human-Gammaglobulin kommen manchmal auch an Kollagenfibrillen vor, wo sie deren Querstreifung maskieren können. 5. Innerhalb der Basallamina der dermo-epidermalen Verbundzone und in der Gefäßwand selbst konnten Aggregate von Human-Gammaglobulin nicht nachgewiesen werden. 6. Phänomene, die eine Phagocytose solcher Aggregate durch Granulocyten oder Makrophagen nahelegen, konnten nicht beobachtet werden. 7. Unsere elektronenmikroskopischen Befunde stehen in guter Übereinstimmung mit immunofluorescenzmikroskopischen Befunden. Wir vermuten, daß die oben beschriebenen Aggregate von Human-Gammaglobulin Niederschläge von Immunkomplexen darstellen, die vielleicht durch Arthus-ähnliche Phänomene zustande kommen.
    Notes: Summary 1. The peroxidase-labeled antibody method was applied to the study of the skin of discoid lupus erythematosus at the electron microscopical level. 2. Aggregates of human γ-globulin were found in the subbasal laminal regions of the dermo-epidermal junction. 3. Aggregates of human γ-globulin were observed in the sub-endothelial areas of small blood vessels. 4. No aggregates were found within the basal lamina of the dermo-epidermal junction or of the vascular walls. 5. Aggregates sometimes occurred on collagen fibrils, masking their crossbanding. 6. Any phenomenon suggesting phagocytosis of these aggregates by leucocytes or macrophages has not been observed. 7. Our electron microscopical findings are in accordance with the immunofluorescent reports. We speculate that the aggregates of human γ-globulins as described above may represent deposits of immune complexes, which may originate from an Arthus-like phenomenon.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 290 (1998), S. 615-620 
    ISSN: 1432-069X
    Keywords: Key words Skin barrier function ; Proliferation ; Sodium lauryl sulphate ; Keratinocytes ; Transepidermal ; water loss
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract It is well known that cutaneous irritants influence epidermal proliferation but the pathogenesis is poorly understood. Recent investigations have shown that the skin barrier integrity influences the proliferation of the basal keratinocytes. Our question was whether the proliferating activity of keratinocytes is indeed regulated by the degree of skin barrier damage or by a direct toxic action of the irritant on the keratinocytes. Therefore various degrees of skin irritation were induced by the application of 0.1%, 0.5% and 2% sodium lauryl sulphate (SLS) solution to the forearm skin of six healthy volunteers. This experiment was performed to evaluate the relationship between SLS concentration and epidermal proliferation. In a second experiment another 14 volunteers were treated with a single SLS concentration (0.5%) to look for interindividual differences in the patterns of skin reaction and susceptibility to the irritant. Skin barrier function was evaluated by measurements of transepidermal water loss (TEWL) before and after irritation. Punch biopsies were taken after 96 h from exposed areas and from unexposed normal skin. Dividing keratinocytes were identified immunocytochemically using three different monoclonal antibodies: PCNA, MIB 1 and KiS1. Exposure to SLS resulted in concentration-dependent increases in both TEWL and epidermal proliferation. However, no significant correlation could be found between the degree of hyperproliferation and the TEWL changes. The results suggest that epidermal proliferation is modulated by a direct interaction of the surfactant with the keratinocytes and/or by release of mediators rather than the consequence of a barrier disturbance.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 261 (1978), S. 7-16 
    ISSN: 1432-069X
    Keywords: Erythema elevatum diutinum ; Extracellular cholesterosis ; Electron microscopy ; Lipid deposition ; Vasculitis ; Erythema elevatum diutinum ; Extracelluläre Cholesterinose ; Elektronenmikroskopie ; Lipidablagerung ; Vaskulitis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung 1. Ein typischer Fall von Erythema elevatum diutinum (E.e.d.) mit extracellulärer Cholesterinose bei einer 48jährigen Patientin mit bisher 15 Jahre dauerndem Verlauf wird klinisch und histologisch beschrieben. 2. Elektronenmikroskopisch wird die histologisch und immunfluorescenzmikroskopisch nachgewiesene leukocytoklastische Vaskulitis bestätigt. In älteren Herden herrschen Histiocyten/Makrophagen vor. Intra- und extracelluläre Lipidablagerungen erscheinen elektronenmikroskopisch unter verschiedenartigen Bildern, die sich in ihrer Gesamtheit von allen anderen bisher ultrastrukturell beschriebenen Krankheiten mit Lipidablagerungen unterscheiden. 3. Die Befunde sind mit der Hypothese vereinbar, daß primär bei E.e.d. eine besondere Form von chronischer leukocytoklastischer Vaskulitis vorliegt und die Lipidablagerungen sekundär auf dem Boden von Gefäßwandschädigungen und Nekrosen entstehen.
    Notes: Summary 1. A typical case of Erythema elevatum diutinum (E.e.d.) with extracellular cholesterosis is described clinically and histologically in a 48-year-old woman. The disease had a course of 15 years. 2. Electron microscopy confirmed the histological and immunfluorescent findings of leucocytoclastic vasculitis. In older lesions, histiocytes/macrophages predominate. Intra- and extracellular lipid depositions showed a variety of ultrastuctural characteristics which differed from electron microscopical findings described in other disorders associated with lipid deposition. 3. The findings are in accordance with the hypothesis that the primary event in E.e.d. is a special type of chronic leukocytoclastic vasculitis. Subsequently, the damage of the vessel walls and focal necrosis may lead to secondary lipid deposition.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...