773 resultados para Periodical cicada
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DNA Barcoding (Hebert et al. 2003) has the potential to revolutionize the process of identifying and cataloguing biodiversity; however, significant controversy surrounds some of the proposed applications. In the seven years since DNA barcoding was introduced, the Web of Science records more than 600 studies that have weighed the pros and cons of this procedure. Unfortunately, the scientific community has been unable to come to any consensus on what threshold to use to differentiate species or even whether the barcoding region provides enough information to serve as an accurate species identification tool. The purpose of my thesis is to analyze mitochondrial DNA (mtDNA) barcoding’s potential to identify known species and provide a well-resolved phylogeny for the New Zealand cicada genus Kikihia. In order to do this, I created a phylogenetic tree for species in the genus Kikihia based solely on the barcoding region and compared it to a phylogeny previously created by Marshall et al. (2008) that benefits from information from other mtDNA and nuclear genes as well as species-specific song data. I determined how well the barcoding region delimits species that have been recognized based on morphology and song. In addition, I looked at the effect of sampling on the success of barcoding studies. I analyzed subsets of a larger, more densely sampled dataset for the Kikihia Muta Group to determine which aspects of my sampling strategy led to the most accurate identifications. Since DNA barcoding would by definition have problems in diagnosing hybrid individuals, I studied two species (K. “murihikua” and K. angusta) that are known to hybridize. Individuals that were not obvious hybrids (determined by morphology) were selected for the case study. Phylogenetic analysis of the barcoding region revealed insights into the reasons these two species could not be successfully differentiated using barcoding alone.
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The Arab Press in Palestine developed at the turn of the twentieth century and proliferated for several decades despite restrictions imposed under the Ottoman Empire and during the British Mandate Period (1917-1948). Hardcopies of the early newspapers and periodicals are rare and access to them at a few Palestinian municipal or private libraries is limited. The Al-Aqsa Mosque Library holds one of the largest collections of Palestinian historical newspapers and periodicals. The collection provides a unique and rich source of information about the history of Palestine in the first half of the twentieth century. Access to the collection is limited and brittle paper copies have been rapidly deteriorating. This paper provides an overview of the digitization project aimed at preserving the historical periodical collection located at the AlAqsa Mosque Library
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No. 26 and 27 issued in combined form.
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Mode of access: Internet.
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Mode of access: Internet.
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Vols. 13 and 14 have imprint: Worcester, Mass., American Antiquarian Society.
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Editor: Philip Gilbert Hamerton.
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Paged continuously.
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Mode of access: Internet.
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Issues for Dec. 1896-Dec. 1905, printed on one side of the leaf only.
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Mode of access: Internet.
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Covers the period from 1713 to 1797.
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Includes index.