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  • 1
    Electronic Resource
    Electronic Resource
    Matting of scalp hair during shampooing—a new look (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental dermatology 15 (1990), S. 0 
    Details
    ISSN: 1365-2230
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We present a new case of irreversible hair matting, a rare, but important and alarming, acquired hair disorder. This case was investigated to test the causal hypothesis proposed in 1984. At the same time four other specimens of matted hair from patients and tangles from normal individuals were also examined. Light and electron microscopy showed dramatic permanent twisting and bending of the hairs through 180°. There was marked variation in the fibre width of hairs from matted samples, with some longitudinally split along a considerable length. This bending and entanglement of hairs of varying widths (felting) seemed to be the main reason for the hairs becoming so dramatically knotted together in four of the cases. In only one case was there any evidence of a viscous fluid binding the hair together. This finding suggests that there may be two different mechanisms involved in hair matting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2230.1990.tb02052.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Weathering of hair in trichothiodystrophy (1986)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 114 (1986), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The structure of hairs from three patients with sulphur-deficient hair, trichothiodystrophy, has been studies by light, plane-polarizing and scanning electron microscopy. Severe cuticular and secondary cortical degeneration was evident along almost the entire length of the hair shaft, with cuticle loss, trichorrhexis nodosa formation and trichoschisis. The severity of these changes varied between patients. The role of the cuticle in protecting hair from environmental damage is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2133.1986.tb04066.x
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  • 3
    Electronic Resource
    Electronic Resource
    Cheveux incoiffables—diagnostic, clinical and hair microscopic findings, and pathogenic studies (1994)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 131 (1994), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Three possible mechanisms of the hair shaft abnormality in cheveux incoiffables have been investigated in nine patients. Cheveux incoiffables hairs were found to exhibit a normal distribution of cystine-rich protein within both the cuticle and the cortex, as determined by silver methenamine ultrastructural cytochemistry. Resistance to stretching, at 65% relative humidity and constant temperature, was similar to normal controls. Resistance to bending forces was also assessed, and was equivalent in both groups. On scanning electron microscopy, all patients with cheveux incoiffables demonstrated longitudinal grooving of the hair shaft, and the hairs were triangular or heart-shaped in cross-section. In addition, there appeared to be minimal cuticular weathering. Even hairs of 20–30 cm length showed only minimal cuticular and cortical weathering, compared with normal hair shafts of similar length and diameter. It is possible that the reduced progressive weathering renders the hair shaft more rigid, and could serve to explain the ‘stand on end’ appearance of the hair which is typical of this condition. However, the characteristic cross-sectional shape of the hair shaft in cheveux incoiffables may render it more rigid and resistant to bending forces. This latter theory has yet to be fully investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2133.1994.tb04970.x
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  • 4
    Electronic Resource
    Electronic Resource
    Alterations in the basement membrane zone in pili annulati hair follicles as demonstrated by electron microscopy and immunohistochemistry (2004)
    Oxford, UK : Blackwell Science Ltd
    British journal of dermatology 150 (2004), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background  Pili annulati is a rare autosomal dominant inherited hair shaft abnormality in which clinical examination reveals alternating light and dark bands leading to a shiny appearance of the hair. The clinically light bands are the abnormal areas due to cavities within the cortex. The pathogenesis remains unknown.Objectives  To investigate the expression of the basement membrane zone (BMZ) components in pili annulati hair follicles of the scalp.Methods  Transmission electron microscopy (TEM) was carried out on scalp sections of six individuals with pili annulati and six controls. Longitudinal sections of scalp tissues from four individuals with pili annulati and six normal controls were studied by immunohistochemistry with a panel of monoclonal antibodies to the following BMZ components: α6β4 integrin, laminin 5, LH39 antigen, laminin 1, collagen IV and collagen VII.Results  Using TEM, pili annulati scalp specimens exhibited a reduplicated lamina densa in the region of the root bulb in comparison with the single thin electron-dense band in controls. Using immunohistochemistry, there was a wavy BMZ in pili annulati follicles with antibodies to components of the lamina lucida, lamina densa and anchoring fibrils, whereas the BMZ in control hair follicles was as a smooth linear band. The expression of the hemidesmosome-associated α6β4 integrin was linear in both pili annulati and control hair follicles.Conclusions  Our results suggest that the genetic defect may be a mutation in proteins involved in signalling and regulation of formation and degradation of the lamina densa and sublamina densa region resulting in abnormal assembly or remodelling of the BMZ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0007-0963.2004.05837.x
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  • 5
    Electronic Resource
    Electronic Resource
    Acquired kinking of the hair associated with etretinate therapy (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental dermatology 10 (1985), S. 0 
    Details
    ISSN: 1365-2230
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We describe three patients in whom dose-dependent, reversible kinking of the hair has occurred while receiving etretinate therapy. The morphological changes of the hair consist of incomplete twists, variation in bore and pigmentation. We propose that the changes may result from the drug's effect on the inner root sheath of the hair.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2230.1985.tb00599.x
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  • 6
    Electronic Resource
    Electronic Resource
    Monilethrix: a clinicopathological illustration of a cortical defect (1993)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 128 (1993), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We describe two sisters aged 2 and 7 years, with monilethrix. The older sister was clinically less severely affected but, microscopically, the features of weathering and alternating nodes and internodes were more obvious. The younger girl had more severe alopecia, with shorter hair, but the microscopic features were less marked. Scanning-electron microscopy demonstrated only slight cuticular weathering in both cases, and evidence of breakage in the cuticle at points of no obvious cuticular pathology. Transmission-electron microscopy showed normal cuticle cells in cross-section, but an abnormal cortex. The abnormalities included areas of homogeneous non-fibrillar material, and a deviated axis of some microfibrils. We consider that these findings support the possibility that a cortical defect contributes significantly to the fragility of hair in moniiethrix. This might explain why hair with marked beading can be stronger than hair from an affected sibling with less apparent abnormality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2133.1993.tb00179.x
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  • 7
    Electronic Resource
    Electronic Resource
    The location of binding sites of pemphigus vulgaris and pemphigus foliaceus autoantibodies: a post-embedding immunoelectron microscopic study (1997)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 136 (1997), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Pemphigus is a life-threatening autommune blistering discase of skin and mucous membranes that has two major subtypes based on clinical and histolgical features, pemphigus vulgaris (PV) and pemphigus foliaceus (PF). Autoantibodies against the PV antigen (desmoglein 3) and the PF antigen (desmoglein 1) are involved in the pathogenesis of blister formation. In the present study, the location of epitopes recognized by autoantibodies of patients with PV and PF was studied by postembedding immunogold electron microscopy. PV and PF autoantibodies were observed bound predominantly to the intercellular domains of desmosomes, but not to the non-desmosomal keratinocyte cell surface. The relationship between the location of PF antigen and other constitutive desmosomal proteins. desmocollin, desmoplakin and plakoglobin, in normal human skin was investigated using a double immunogold labelling techinique. It was observed that PF antigen and desmocollin co-localize within the intercellular domain of the desmosomes. In contrast, the antibodies against desmoplakin and plakoglobin bound predominantly to the intracellular desmosomal attachment plaque with the binding site of the antibody against plakoglobin closer to the desmosomal cell membrane than that of the antibody to desmoplakin. We show that the LR White postembedded immunogold electronmicroscopy technique is convenient and easily applied to studied to studies of autoimmune bullous skin diseases. We have used it to demonstrated the precise localization of the binding sites of PV and PF autoantibodies and their reltionship with other constitutive desmosomal proteins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2133.1997.01823.x
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  • 8
    Electronic Resource
    Electronic Resource
    Adenoid cystic carcinoma of the breast: a case with axillary lymph node metastasis (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Histopathology 10 (1986), S. 0 
    Details
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A breast tumour with proven lymph node metastasis is conclusively characterized as an adenoid cystic carcinoma using immunocytochemistry and electron microscopy. The majority of tumour cells showed certain of the characteristic features of myoepithetial cells while the pseudocystic spaces contained large amounts of reduplicated basal lamina. A small proportion of tumour cells, however, showed epithelial differentiation with the formation of true lumina.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2559.1986.tb02494.x
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  • 9
    Electronic Resource
    Electronic Resource
    An ultrastructural study of mucoid carcinoma of the breast: variability of cytoplasmic features (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Histopathology 10 (1986), S. 0 
    Details
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The ultrastructural characteristics of 14 cases of mucoid carcinoma of the breast, with different histological appearances, have been examined. Thirteen of the tumours were observed to consist of two populations of tumour cells, one showing secretory changes while the other group showed no evidence of activity. In one tumour only synthetically active cells were observed. Ultrastructurally, six different types of cytoplasmic granules, comprising typical mucin plus glycoprotein or proteincontaining granules, were identified within the synthetically active tumour cells. The number of types of granules and the relative proportion of the various granules varied between tumours with only mucin granules present in all tumours. It would appear that synthetic pathways are activated in certain tumours which result in protein/glycoprotein granules associated with the argyrophilia observed histologically. In addition, the tumours varied with respect to luminal differentiation, presence of intracytoplasmic lumina, intracytoplasmic mucin pools, lipid droplets, ciliated cells and areas of calcification. The marked heterogeneity of the ultrastructural features of the mucoid carcinoma of the breast prevents the tumours from being readily divided into distinct subgroups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2559.1986.tb02566.x
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  • 10
    Electronic Resource
    Electronic Resource
    Sequestration in Plasmodium falciparum malaria: Sticky cells and sticky problems
    Amsterdam : Elsevier
    Parasitology Today 6 (1990), S. 247-254 
    Details
    ISSN: 0169-4758
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0169-4758(90)90184-6
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