198,204 research outputs found
Hydrochemistry, water table depth and related distribution patterns of vascular plants in a mixed mire
No full textThe hydrological and floristic variation within a mire vegetation is mostly controlled by three ecological gradients: nutrient availability, acidity-alkalinity, and water table depth. The objectives of this study were: (a) to analyse the hydrochemistry of a mixed mire in relation to different habitat conditions; (b) to evaluate the patterns of vascular plant composition in relation to nutrient availability, acidity-alkainity, and water table depth, and to partition the pure effects of these gradients. Within a mixed mire, we sampled 36 smalling a growing season. Water chemistry proved to be significantly different between the various vegetation types. Two biological systems could be identified according to hydrochemistry and vascular plant composition: (1) several fen vegetation types lacking raised Sphagnum structures where the water chemistry reflected groundwater properties; (2) bog Sphagnum-dominated vegetation, where the convex shape of the mire surface prevented mixing with the groundwater. The results of the partitioning indicated that the acidity-alkalinity gradient was more important in controlling the patterns of plant distribution than water table depth. © 2008 Società Botanica Italiana
A metal-independent hydrolase from a Penicillium oxalicum strain able to use phosphonoacetic acid as the only phosphorus source.
No full textA Penicillium oxalicum strain was capable of the phosphate-sensitive utilization of phosphonoacetic acid as the sole source of phosphorus. A carbon-to-phosphorus bond-cleavage enzyme yielding acetic acid and inorganic phosphate was detected and characterized in extracts from cells grown on this phosphonate. Contrary to bacterial phosphonoacetate hydrolases, the fungal enzyme neither required nor was stimulated by divalent cations
Vascular plant and Orthoptera diversity in relation to grassland management and landscape composition in the European Alps
No full text1. Several recent studies have considered the relative effects of local vs. landscape factors on diversity of several animal taxa in grasslands. However, very few have considered vascular plant or Orthoptera species, both of which are important biotic components of grassland ecosystems. The general aim of this study was to determine the effect of grassland management and landscape composition, and their potential interactions, on diversity patterns of vascular plants and Orthoptera in Alpine hay meadows.
2. We considered three groups of management regimes defined by different amounts of fertilizer nitrogen applied and cutting frequency: (i) extensive, (ii) low intensive and (iii) intensive meadows situated in different landscape contexts. To evaluate the relative importance of meadow management and landscape composition on diversity patterns, we applied analysis of covariance and variation partitioning analyses.
3. Diversity patterns of both taxonomic groups were affected primarily by grassland management. The extensive management regime was most suitable for conserving high species richness of both taxonomic groups. The intensive meadows were characterized by plant communities dominated by a few ruderal and competitor species, and by Orthoptera communities composed of only a few abundant Caelifera species (e.g. Chorthippus parallelus), while Ensifera species had very low individual densities.
4. Regarding the landscape determinants, plant diversity patterns were not significantly related to any landscape composition variables. In contrast, a high proportion of urban elements and grassland in the surrounding landscape (radius 500 m) affected Orthoptera species richness negatively.
5. Synthesis and applications . The implementation of well-targeted agri-environment schemes for compensation payments against intensification and abandonment of extensive hay meadows seems to be a promising tool to protect both taxonomic groups. In this context, we suggest that the existing Swiss ecological compensation area (ECA) hay meadow agri-environment scheme, which requie at least one cut every year and no fertilizer application, might also be suitable for the Italian Alps. Moreover, the significant influence of landscape composition on Orthoptera diversity suggests that the effectiveness of measures applied at a field scale may be improved by integration of protected area schemes, promoting extensive management at a farm scale
Patterns of plant species richness in Alpine hay meadows: Local vs. landscape controls
No full textHabitat type and quality are recognised as important local determinants of species richness, but other processes operating at the landscape scale can also affect diversity patterns. The evidence regarding the relative mportance of landscape context on vascular plants is diverse, and little is known about the effects of this complex factor in Alpine environments. Hence, the primary purpose of the study was to elucidate the relative effects of the determinants of plant species richness by decomposing the variation into local and landscape components. We sampled 99 hay meadows in the Italian Alps, and recorded 14 explanatory variables ascribed to three sets: two sets of local variables, meadow management and abiotic environment, and a set of landscape variables. Plant diversity was affected primarily by local determinants. Species richness tended to increase in less fertilised meadows, confirming the detrimental effect of intensive meadow management on plant diversity. Site conditions such as steep slopes also enhanced plant species richness, showing a most pronounced positive effect in meadows that were cut less frequently. As to the landscape determinants, a high proportion of urban elements affected species richness negatively probably due to further eutrophication. In contrast, an increased length of meadow edges had a positive effect, particularly in meadows located on shallow soils. Partitioning analyses revealed that the three sets of variables showed relatively large shared effects with each other (over half of the total variation explained). In conclusion, the composition of the surrounding landscape had a lower impact on vascular plant species richness than did meadow management and local abiotic environment
Sender – Recipient – Dialogue. The Conversational Nature of Polemical Texts
No full textThis paper discusses communicative strategies as employed by three 17th-century authors in the following texts: Lithos by Piotr Mohyla, Rozmowa białocerkiewna [A dialogue in Biała Cerkiew] and Messiasz prawdziwy [The Messiah] both by Joannicius Galatowski. The analysis of the relationships obtaining between the interlocutors, ways of evaluating their adversaries and their lines of argument makes the author of the paper postulate a relationship between the degree of emotionality of the text and the communicative distance between the interlocutors. The larger the distance, the larger the number of explicit negative judgments and more openly expressed emotionality. The author of the message is inscribed in the text, even though he is not an initiator of the debate. The author is always a more powerful partner, endowed with social and moral authority, and the ultimate receiver – the reader is expected to take his view.Katolicki Uniwersytet Lubelski Jana Pawła IIAbramowska T., 2002, Dialog, [w:] Słownik literatury staropolskiej, red. T. Michałowska, Wrocław, s. 159–163.Brückner A., 1896, ¨ Spory o unię w dawnej literaturze, „Kwartalnik Historyczny”, r. 10, z. 3, s. 578–644.Głowiński M., Kostkiewiczowa T., Okopień-Sławińska A., Sławiński J., 1988, Słownik terminów literackich, Wrocław.Hawrysz M., 2009, Determinanty stylotwórcze „Rozmów chrystiańskich” Marcina Czechowica, [w:] Język i styl twórcy w kręgu badań współczesnej humanistyki, red. K. Maćkowiak, C. Piątkowski, Zielona Góra, s. 131–140.Karpluk M., 1998, Ku dalekiemu pojednaniu. Dysputa prawosławno-katolicka metropolity Piotra Mohyły z ks. Kasjanem Sakowiczem, [w:] Czterechsetlecie unii brzeskiej. Zagadnienia języka religijnego, red. Z. Leszczyński, Lublin, s. 37–47.Klimek J., 2008, „Ruszyłeś głową jak zdechłe cielę ogonem”. Piotr Mohyła odpowiada Kasjanowi Sakowiczowi, [w:] Styl a semantyka, red. I. Szczepankowska, Białystok, s. 175–194.–, 2009, „To niedaleko od siebie chodźimy, ieżeli tak wierzyćie i my tak wierz ´ ymy”. Rozmowa pomiędzy trzema osobami dwóch wyznań, „Roczniki Humanistyczne KUL” 6, s. 159–175.–, 2010, „Messiasz prawdziwy” Joannicjusza Galatowskiego – dialog polemiczny? Uwagi o składni, [w:] Odmiany stylowe polszczyzny dawniej i dziś, red. U. Sokólska, Białystok 2011, s. 57–74.Knapiusz G., 1643, Thesaurus Polonolatinograecus, t. 1, Kraków.Nowakowski P., 2004, Problematyka liturgiczna w międzywyznaniowej polemice po Unii Brzeskiej (1596–1720), Kraków.Siuciak M., 2000, Zróżnicowanie gatunkowe komunikacji ustnej w XVII wieku, [w:] Gatunki mowy i ich ewolucja. T. 1. Mowy piękno wielorakie, red. D. Ostaszewska, Katowice, s. 355–369.–, 2004, „Rozmowa albo dialog...” – wykorzystanie modelu ustnej komunikacji w literaturze XVI i XVII wieku, [w:] Gatunki mowy i ich ewolucja. T. 2. Tekst a gatunek, red. D. Ostaszewska, Katowice, s. 414–423.Skudrzykowa A, Urban K., 2000, Mały słownik terminów z zakresu socjolingwistyki i pragmatyki językowej, Kraków.Stradomski J., 2003, Spory o „wiarę grecką” w dawnej Rzeczypospolitej, Kraków.15716
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Dr. Glendon Swarthout
No full textHosted by Roger M. Busfield, MSU Assistant Professor of Speech and Theater, Meet the Author is designed to introduce a general audience to a contemporary author and their work through in-depth interviews. This episode features a conversation between Dr. Glendon Swarthout, prolific author and English professor at MSU, and assistant professors Sam S. Baskett and Theodore B. Strandness
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