34,293 research outputs found
Photobiont selectivity in the epiphytic lichens Hypogymnia physodes and Lecanora conizaeoides
No full textIn two lichen species, Hypogymnia physodes and Lecanora conizaeoides, often used as model organisms for pollution-sensitive and pollution-tolerant epiphytic lichens, respectively, the hypothesis was tested that the toxitolerance of the Trebouxia photobiont limits the tolerance of the entire lichen symbiosis. Being lecanoralean-trebouxioid associations, H. physodes and L. conizaeoides represent the most common type of lichens. Photobionts of both lichen species deriving from microhabitats with varying supply of S and heavy metals were identified using nuclear ITS nrDNA sequencing. The photobiont of L. conizaeoides was identified as T. simplex, whereas the photobiont of H. physodes belongs to an undescribed Trebouxia species, related to T. jamesii subsp. angustilobata and provisionally named as T. hypogymniae Hauck & Friedl ined. Since T. hypogymniae ined. is also known from Lecidea silacea, which is characteristic of rock and slag with high heavy metal content, a high sensitivity of this alga to pollutants is unlikely to be a key factor for the relatively low toxitolerance of H. physodes. Furthermore, the photobiont cannot be crucial for the extremely high toxitolerance of L. conizaeoides, as T simplex is also known from pollution-sensitive lichens of the fruticose genus Pseudevernia. These findings suggest that the photobiont is not generally a key factor determining pollution sensitivity in the most common type of lichen symbiosis. The high specificity for T. simplex in L. conizaeoides in existing populations of L. conizaeoides suggest that already established thalli could be a source of photobiont cells for re-lichenization
The Culture Collection of Algae at Göttingen University (SAG): A Biological Resource for Biotechnological and Biodiversity Research
No full textAbstractThe SAG is one of the most comprehensive resources of microalgal cultures (www.epsag.uni-goettingen.de). It is supporting research in biotechnology and biodiversity through ex situ conservation of algae and expert knowledge on identifying and isolating. Multiple strains proven to represent the same microalgal species exhibit extensive genotypic diversity interesting for further exploitation. Cryopreservation is well suited to circumvent problems associated with perpetual maintenance, but needs optimization to ensure genetic stability. To ensure the SAG's reliability, primary goals are correctly identified strains as references for DNA sequence comparisons. Novel isolates from unusual terrestrial habitats worth further biotechnological exploitation are being developed
Thomas Grisell letter to Thomas Rotch, 2nd mo 19th 1823
No full textThomas Grisell's letter reached the Rotch household several months before the unexpected death of Thomas Rotch in August, 1823. This is the last letter of the series and presumably the author learned of his friend's death before another letter was penned. 7.95" x 10" (20.2 by 25.5 cm
Phylogenetic relationships of green algae assigned to the genus Planophila (Chlorophyta): evidence from 18S rDNA sequence data and ultrastructure
No full textPhylogenetic analyses, based upon nuclear small-subunit ribosomal RNA gene sequences, of four 'chlorosarcinoid' species referred to Planophila Gerneck show that the genus is polyphyletic. The type species, P. laetevirens Gerneck, is closely related to species in the Ulotrichales, Ulvophyceae. The monotypic sarcinoid genus Pseudendocloniopsis is the closest relative of Planophila; the two genera represent the addition of a new morphological type to the Ulotrichales. Planophila microcystis (Dangeard) Kornmann & Sahling forms a clade at the base of the Ulvophyceae with Oltmannsiellopsis, and thus belongs to the Oltmannsiellopsidales. This result is also supported by the Oltmannsiellopsis-like ultrastructure of P. microcystis zoospores. Planophila sp. B from Antarctica, which has Trehouxia-like pyrenoid structure, is a trebouxiophyte closely related to Chlorella-like unicellular coccoids, Stichococcus bacillaris and Prasiola species. This is the first robustly supported molecular phylogenetic analysis that places Prasiola in the Trebouxiophyceae. As shown previously, P. terrestris Groover & Hofstetter belongs to the Chaetopeltidales, Chlorophyceae. Dangemannia gen. nov. (type species: D. microcystis (Dangeard) comb. nov.), Floydiella gen. nov. (type species: F. terrestris (Groover & Hofstetter) comb. nov.) and Pabia gen. nov. (type: P. signiensis sp. nov.) are proposed
Failed Censures: Ecclesiastical Regulation of Women’s Clothing in Late Medieval Italy
No full textChurchmen in the late thirteenth and early fourteenth centuries tried to regulate the costume of Italian women. These efforts failed, and regulation was largely left thereafter to civic authorities.The published version was published as Chapter 3 in Medieval Clothing and Textiles 5Izbicki, Thomas M. (2009), "Failed Censures: Ecclesiastical Regulation of Women’s Clothing in Late Medieval Italy" in Netherton, Robin and Owen-Crocker, Gale R., eds., Medieval Clothing and Textiles 5 (Boydell Press), 37-53ISBN: 9781843834519 (published book)Peer reviewe
Western medieval legal manuscripts in the collections of the University of Pennsylvania
No full textWestern legal manuscripts of the Middle Ages in North American collections are among the least known to scholars. The University of Pennsylvania has a rich collection of these texts, several of which were in the collection of the historian Henry Charles Lea. Included are works of civil law and canon law, as well as collections of papal letters and guides to pastoral care. The descriptions of most of these manuscripts in the catalog of Norman P. Zacour and Rudolf Hirsch are perfunctory, sometimes erring or omitting valuable information. Other manuscripts were added in recent years in the Lawrence J. Schoenberg Collection. Much of this material is being added to the Franklin online catalog of the University’s libraries, but researchers frequently do not search these digital resources. This article provides more complete guidance to the University’s medieval legal manuscripts than any of the existing catalogs offers, whether in print or online. It also provides updated bibliographic information in print or online. Every manuscript has been examined by the author in situ. Among the important works represented in the collection is the Panormia (a work of canon law often attributed to Ivo of Chartres). Authors present include the curialist Thomas of Capua, canonists Petrus de Braco, William of Pagula, Bernardus Raimundi, Adam of Aldersbach, Raymond of Peñafort, and civil lawyers Baldus de Ubaldis, and Bartolus de Saxoferrato. Three of these manuscripts were owned in the past by Sir Thomas Phillipps
Forbidden Colors in the Regulation of Clerical Dress from the Fourth Lateran Council (1215) to the Time of Nicholas of Cusa (d. 1464)
No full textMedieval canon law attempted to distinguish clergy from the laity by restricting their dress choices. The article focuses on prohibition of wearing red or green on the street. Both colors were identified with the nobility.The published version was published as Chapter 7 in Medieval Clothing and Textiles 1Izbicki, Thomas M. (2005), "Forbidden Colors in the Regulation of Clerical Dress from the Fourth Lateran Council (1215) to the Time of Nicholas of Cusa (d. 1464)" in Netherton, Robin and Owen-Crocker, Gale R., eds., Medieval Clothing and Textiles 1 (Boydell Press),105-114ISBN: 9781843831235 (published book
Thomas Crutchfield account book, 1848-1861
No full textA book containing business accounts, including details about travel expenses and the purchase and sale of lumber as well as other goods and services. The author also catalogs personal spending, the dates and pricing of properties offered for rent, and the purchase and leasing of enslaved people. Many entries are consistent with the business activities of Thomas Crutchfield Sr., who died in 1850. Someone continued to make entries in the book for activities dated up to 1861
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