The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform
Liliane Petrini - One of the best experts on this subject based on the ideXlab platform.
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Chemical Elements in mushrooms: their potential taxonomic significance
Mycological Progress, 2009Co-Authors: Orlando Petrini, Luigi Cocchi, Luciano Vescovi, Liliane PetriniAbstract:One inherent problem in taxonomy is the choice of an internal or external reference. Phylogenetic studies routinely use outgroups, but classical taxonomy studies often lack internal or external controls. We suggest the establishment of internal references when dealing with large amounts of data that can be summarised by descriptive statistics. This study introduces the use of group centroids (i.e., “reference fungi”) in taxonomy and describes the potential utility of Chemical Elements and methods of inorganic analytical chemistry in fungal taxonomy, using macromycete fruiting bodies as an example. Macromycetes are known to accumulate high levels of various Chemical Elements, in particular heavy metals. Their concentration is assumed to be species-specific, but substrate composition may also influence their presence in the mycelium and fruiting bodies. We have analysed the distribution of several Chemical Elements in a large sample of approximately 9,000 ascomycetous and basidiomycetous fruiting bodies, investigated in a study carried out during the last 20 years using univariate and multivariate methods. An internal control that we have called the “reference fungus” has been defined as the group average in univariate and group centroid in multivariate analyses. This has been useful to detect major deviations of selected samples from the mean values of the dataset. This methodology may be applied to any data, including morphological or ecological characters that can be summarised by descriptive statistics. The internal controls must be defined on a case-by-case basis.
Orlando Petrini - One of the best experts on this subject based on the ideXlab platform.
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Chemical Elements in mushrooms: their potential taxonomic significance
Mycological Progress, 2009Co-Authors: Orlando Petrini, Luigi Cocchi, Luciano Vescovi, Liliane PetriniAbstract:One inherent problem in taxonomy is the choice of an internal or external reference. Phylogenetic studies routinely use outgroups, but classical taxonomy studies often lack internal or external controls. We suggest the establishment of internal references when dealing with large amounts of data that can be summarised by descriptive statistics. This study introduces the use of group centroids (i.e., “reference fungi”) in taxonomy and describes the potential utility of Chemical Elements and methods of inorganic analytical chemistry in fungal taxonomy, using macromycete fruiting bodies as an example. Macromycetes are known to accumulate high levels of various Chemical Elements, in particular heavy metals. Their concentration is assumed to be species-specific, but substrate composition may also influence their presence in the mycelium and fruiting bodies. We have analysed the distribution of several Chemical Elements in a large sample of approximately 9,000 ascomycetous and basidiomycetous fruiting bodies, investigated in a study carried out during the last 20 years using univariate and multivariate methods. An internal control that we have called the “reference fungus” has been defined as the group average in univariate and group centroid in multivariate analyses. This has been useful to detect major deviations of selected samples from the mean values of the dataset. This methodology may be applied to any data, including morphological or ecological characters that can be summarised by descriptive statistics. The internal controls must be defined on a case-by-case basis.
Luigi Cocchi - One of the best experts on this subject based on the ideXlab platform.
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Chemical Elements in mushrooms: their potential taxonomic significance
Mycological Progress, 2009Co-Authors: Orlando Petrini, Luigi Cocchi, Luciano Vescovi, Liliane PetriniAbstract:One inherent problem in taxonomy is the choice of an internal or external reference. Phylogenetic studies routinely use outgroups, but classical taxonomy studies often lack internal or external controls. We suggest the establishment of internal references when dealing with large amounts of data that can be summarised by descriptive statistics. This study introduces the use of group centroids (i.e., “reference fungi”) in taxonomy and describes the potential utility of Chemical Elements and methods of inorganic analytical chemistry in fungal taxonomy, using macromycete fruiting bodies as an example. Macromycetes are known to accumulate high levels of various Chemical Elements, in particular heavy metals. Their concentration is assumed to be species-specific, but substrate composition may also influence their presence in the mycelium and fruiting bodies. We have analysed the distribution of several Chemical Elements in a large sample of approximately 9,000 ascomycetous and basidiomycetous fruiting bodies, investigated in a study carried out during the last 20 years using univariate and multivariate methods. An internal control that we have called the “reference fungus” has been defined as the group average in univariate and group centroid in multivariate analyses. This has been useful to detect major deviations of selected samples from the mean values of the dataset. This methodology may be applied to any data, including morphological or ecological characters that can be summarised by descriptive statistics. The internal controls must be defined on a case-by-case basis.
Luciano Vescovi - One of the best experts on this subject based on the ideXlab platform.
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Chemical Elements in mushrooms: their potential taxonomic significance
Mycological Progress, 2009Co-Authors: Orlando Petrini, Luigi Cocchi, Luciano Vescovi, Liliane PetriniAbstract:One inherent problem in taxonomy is the choice of an internal or external reference. Phylogenetic studies routinely use outgroups, but classical taxonomy studies often lack internal or external controls. We suggest the establishment of internal references when dealing with large amounts of data that can be summarised by descriptive statistics. This study introduces the use of group centroids (i.e., “reference fungi”) in taxonomy and describes the potential utility of Chemical Elements and methods of inorganic analytical chemistry in fungal taxonomy, using macromycete fruiting bodies as an example. Macromycetes are known to accumulate high levels of various Chemical Elements, in particular heavy metals. Their concentration is assumed to be species-specific, but substrate composition may also influence their presence in the mycelium and fruiting bodies. We have analysed the distribution of several Chemical Elements in a large sample of approximately 9,000 ascomycetous and basidiomycetous fruiting bodies, investigated in a study carried out during the last 20 years using univariate and multivariate methods. An internal control that we have called the “reference fungus” has been defined as the group average in univariate and group centroid in multivariate analyses. This has been useful to detect major deviations of selected samples from the mean values of the dataset. This methodology may be applied to any data, including morphological or ecological characters that can be summarised by descriptive statistics. The internal controls must be defined on a case-by-case basis.
Christo Balarew - One of the best experts on this subject based on the ideXlab platform.
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The periodic table of Chemical Elements – history, nature, meaning
Pure and Applied Chemistry, 2019Co-Authors: Christo BalarewAbstract:Abstract By decision of the UN General Assembly 2019 was declared an International Year of the Periodic Table of Chemical Elements. On this occasion, in Bulgaria, an anniversary postage stamp was issued. Search for a link between the properties of the Chemical Elements and their atomic weight was undertaken before Mendeleev by many chemists. It is characteristic of all these classifications that the observed proximity in the properties of the Elements has been attributed to chance. Mendeleev, however, was the only one who perceived that beyond the periodicity of the Elements’ properties there is an important natural law. With the discovery of the structure of atoms, the periodic table of Chemical Elements found its scientific explanation. The periodic table set an important task to chemistry – to look for the relationship between the composition and the properties of the substances, including the disclosure of the regularities which are the basis of the so-called “anomalies”.