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Beyond the Herald Patch: Exploring the Complex Landscape of Pityriasis Rosea.
Am J Clin Dermatol
January 2025
Dr. Phillip Frost Department of Dermatology and Cutaneous Surgery, University of Miami Miller School of Medicine, Miami, FL, 33136, USA.
Pityriasis rosea (PR) is a prevalent dermatological condition characterized by a distinctive herald patch, followed by secondary eruptions, often forming a "Christmas tree" pattern on the trunk. Despite its recognizable clinical presentation, the etiology of PR remains uncertain, with hypotheses pointing to both infectious and noninfectious origins. Human herpesviruses (HHV) 6 and 7 have been implicated, with evidence suggesting viral reactivation as a potential trigger.
View Article and Find Full Text PDFImpacts of habitat fragmentation on the genetic diversity of the endangered Guatemalan fir (Abies guatemalensis Rehder).
Genetica
December 2024
Facultad de Agronomía, Universidad de San Carlos de Guatemala, Guatemala City, 01012, Guatemala.
Abies guatemalensis Rehder, an endangered conifer endemic to Central American highlands, is ecologically vital in upper montane forests. It faces threats from habitat fragmentation, unsustainable logging, and illegal Christmas tree harvesting. While previous genetic studies on mature trees from eighteen populations showed high within-population diversity and limited among-population differentiation, the genetic impact of recent anthropogenic pressures on younger generations has yet to be discovered.
View Article and Find Full Text PDFPublic engagement with research reproducibility.
PLoS Biol
December 2024
Univ Rennes, CHU Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail) - UMR_S 1085, Rennes, France.
Public engagement with reproducibility is crucial for fostering trust in science. This Community Page outlines, through the example of baking Christmas tree meringues, how scientists can effectively engage and educate the public about the importance of reproducibility in research.
View Article and Find Full Text PDFPhotosynthetic advantages of conifers in the boreal forest.
Trends Plant Sci
November 2024
Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, Linnaeus väg 6, 901 87 Umeå, Sweden. Electronic address:
Boreal conifers - the 'Christmas trees' - maintain their green needles over the winter by retaining their chlorophyll. These conifers face the toughest challenge in February and March, when subzero temperatures coincide with high solar radiation. To balance the light energy they harvest with the light energy they utilise, conifers deploy various mechanisms in parallel.
View Article and Find Full Text PDFJingle bells, what are those smells? Indoor VOC emissions from a live Christmas tree.
Indoor Environ
March 2024
Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
Every year in the United States conifers are purchased to serve as Christmas trees in homes where they emit volatile organic compounds (VOCs) to the indoor environment. Although many studies have measured the ecosystem-level emissions of VOCs from conifers outdoors (characterizing monoterpene, isoprene, and aldehyde emissions), little is known about VOC emission rates once a conifer is brought indoors. Using a proton transfer reaction-mass spectrometer we characterized the VOCs emitted from a freshly cut Douglas Fir for 17 days in an environmentally controlled chamber.
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