Search results for " lichen"
showing 10 items of 170 documents
Pityriasis lichenoides chronica associated with herpes simplex virus type 2.
2012
Introduction. Pityriasis lichenoides is a rare, acquired spectrum of skin conditions of an unknown etiology.Case Report. A 28-year-old man presented with recurrent outbreaks of herpes simplex virus associated with the onset of red-to-brown maculopapules located predominantly in trunk in each recurrence. Positive serologies to herpes simplex virus type 2 were detected. Histopathological examination of one of the lesions was consistent with a diagnosis of pityriasis lichenoides chronica.Discussion. Pityriasis lichenoides is a rare cutaneous entity of an unknown cause which includes different clinical presentations. A number of infectious agents have been implicated based on the clustering of …
Fine-grain beta diversity in Palaearctic open vegetation: variability within and between biomes and vegetation types
2021
Aims: To quantify how fine-grain (within-plot) beta diversity differs among biomes and vegetation types. Study area: Palaearctic biogeographic realm. Methods: We extracted 4,654 nested-plot series with at least four different grain sizes between 0.0001 m² and 1,024 m² from the GrassPlot database spanning broad geographic and ecological gradients. Next, we calculated the slope parameter (z-value) of the power-law species–area relationship (SAR) to use as a measure of multiplicative beta diversity. We did this separately for vascular plants, bryophytes and lichens and for the three groups combined (complete vegetation). We then tested whether z-values differed between biomes, ecological-physi…
Significance of immunohistochemistry biomarkers in prediction of malignant transformation of oral lichen planus
2022
Background: Oral lichen planus (OLP) is a chronic inflammatory disorder with increased risk for malignant transformation. Biomarker validation is a pivotal step in moving newly discovered biomarkers towards clinical implementation. We performed a systematic review of studies on biomarkers related to OLP, wherein biomarkers have been described in at least two independent studies. Our aim was to determine whether any of these biomark-ers might be promising in predicting the increased risk of malignant transformation of OLP. Material and Methods: We searched the following databases until August 2021: PUBMED, EMBASE, and Web of Science. Due to high heterogeneity, a qualitative rather than quant…
Scale-dependent plant diversity in Palaearctic grasslands: a comparative overview
2016
Here we present an extensive overview of plant diversity values in Palaearctic grasslands for seven standard grain sizes from 0.0001 to 100 m². The data originate from 20 studies, including the Field Workshops of the Eurasian Dry Grassland Group (EDGG), ranging geographically from Spain in the west to Siberia in the east, from Sicily in the south to Estonia in the north and from the sea coast up to 3100 m a.s.l. The majority of data is from dry grasslands (Festuco-Brometea, Koelerio-Corynephoretea, Cleistogenetea squarrosae), but there are also some mesic, wet, saline, acidic, alpine and Mediterranean grasslands included. Among others, we compiled data from 1795 1-m², 1109 10-m² and 338 100…
Oral lichenoid lesions related to contact with dental materials: A literature review
2007
Oral lichenoid lesions related to contact are defined as oral-cavity eruptions with an identifiable etiology, and are clinically and histologically similar to oral lichen planus. Within this group are found oral lichenoid lesions related to contact with dental materials (OLLC), the most common being those related to silver amalgam. Currently, it remains difficult to diagnose these lesions due to the clinical and histopathological similarity with oral lichen planus and other oral mucosa lesions of lichenoid characteristics. In the present paper, we carry out an updated review of the tests for, and the different characteristics of OLLC, which may aid the diagnosis. For this review, we made se…
Experimental evidence for proton motive force-dependent catalysis by the diheme-containing succinate:menaquinone oxidoreductase from the Gram-positiv…
2006
In Gram-positive bacteria and other prokaryotes containing succinate:menaquinone reductases, it has previously been shown that the succinate oxidase and succinate:menaquinone reductase activities are lost when the transmembrane electrochemical proton potential, Deltap, is abolished by the rupture of the bacteria or by the addition of a protonophore. It has been proposed that the endergonic reduction of menaquinone by succinate is driven by the electrochemical proton potential. Opposite sides of the cytoplasmic membrane were envisaged to be separately involved in the binding of protons upon the reduction of menaquinone and their release upon succinate oxidation, with the two reactions linked…
I fiori del deserto. Sbarbaro lichenologo
2007
Profonde sono le interconnessioni fra l'universo letterario e quello naturalistico di Sbarbaro. La curiosità per le minime esistenze vegetali è attestata dai sei inventari lichenologici dell'autore ligure, qui analizzati mediante un fitto confronto intertestuale con le fonti botaniche da lui impiegate. 'Fiore del deserto', il lichene si qualifica come il correlativo oggettivo della resistenza del poeta alla desolazione. Inoltre, la presenza in queste prose di un incedere argomentativo riconducibile all'influsso della letteratura scientifica, testimonia della complessità dell'interesse botanico del poeta, che alla mitizzazione della natura unisce l'esperienza concreta di questa realtà metamo…
Oral lichen planus after certolizumab pegol treatment in a patient with Crohn's disease
2011
Dear Sir , Lichen planus (LP) is a relatively uncommon inflammatory dermatosis of the mucocutaneous surfaces that can present with a variety of clinical manifestations and, most commonly, affecting middle-aged adults. The disease course may be short or chronic, although most cases may resolve after 1 month to 7 years. The real prevalence of LP is unknown, but is estimated to be 1% in the USA.1 The pathogenesis of LP is not entirely understood. In general, activated T lymphocytes are recruited to the dermal–epidermal junction and induce apoptosis in basal keratinocytes. Both CD4+ and CD8+ T lymphocytes are found in the lichenoid infiltrate of LP, with a predominance of the latter cell type b…
Il lichene e la farfalla. Sbarbaro e Gozzano fra scienza e poesia
2011
Originale confronto fra il naturalismo lirico di Sbarbaro e l’entomologia poetica di Gozzano. Entrambi accomunati da un interesse scientifico-sentimentale per le più inconsistenti forme di vita naturale – il lichene e la farfalla – i due poeti si distinguono tuttavia per una diversa declinazione della loro passione: è sufficiente scorrere i sei inventari lichenologici redatti dal poeta ligure per accertarsi dell’impiego di un formulario tecnico privo di qualunque orpello estetizzante o astrattizzante, com’è possibile rinvenire ancora negli scritti gozzaniani.
LICHENI E FUNGHI LICHENICOLI DI PANTELLERIA (TRAPANI, SICILIA, ITALIA)
2009
LICHENI E FUNGHI LICHENICOLI DI PANTELLERIA (TRAPANI, SICILIA, ITALIA) Domenico OTTONELLO1, Domenico PUNTILLO2 1Dipartimento di Scienze Botaniche, Università degli Studi di Palermo, Via Archirafi 38, 90123 Palermo; 2Museo di Storia Naturale della Calabria ed Orto Botanico, Università degli Studi della Calabria, 87036 Arcavacata di Rende (CS) L'Isola di Pantelleria è stata oggetto di numerosi studi floristici e fitosociologici sulla flora vascolare. Per quanto concerne i licheni, i pochi lavori risalgono al secolo scorso e agli inizi di quello attuale. La flora lichenica di Pantelleria consta di 219 taxa di cui 74 nuovi per l'isola e uno nuovo per l’Europa (Bacidia insularis Zahlbr.). Le spe…