1,720,968 research outputs found
Morphological and molecular evidence support a new truffle, Tuber sinomacrosporum, in Macrosporum group
No full textWan, Shan-Ping, Liu, Wei, Cui, Meng-Jin, Wang, Rui, Wang, Yu-Yun, Liu, Mei-Ju, Wang, Rui- Xue, Yu, Cheng-Jin, Yu, Fu-Qiang (2023): Morphological and molecular evidence support a new truffle, Tuber sinomacrosporum, in Macrosporum group. Phytotaxa 591 (4): 283-291, DOI: 10.11646/phytotaxa.591.4.5, URL: http://dx.doi.org/10.1094/PDIS-04-22-0755-PD
Ethnobiological notes and volatile profiles of two rare Chinese desert truffles
Full text linkThe production of a distinct profile of volatile organic compounds plays a crucial role in the ecology of hypogeous Ascomycetes, and is also key to their gastronomic relevance. In this study, we explored the aroma components of two rarely investigated Chinese desert truffles, namely Mattirolomyces terfezioides and Choiromyces cerebriformis, using headspace solid-phase microextraction (HS-SPME) coupled with gas chromatography-mass spectrometry (GC-MS). Our investigation revealed the significant presence of sulphur-containing volatiles in the aroma of M. terfezioides but not in C. cerebriformis. We discussed available information on the distribution of these interesting truffles in China and their use as choice food by local people
Setting the Scene
No full textFungi are a keystone component of all ecosystems on earth and have shaped the structure and functioning of nature for eons. Their body is made up of an interwoven mass of threadlike filaments, individually called hyphae and altogether known as mycelium. When fungi form spore-forming structures, the so-called mushrooms, these are also built up of hyphae. The three known trophic groups of fungi have had a fundamental functional diversity in the development of life as we know it. The so-called saprotrophs use the complex dead materials of plants, animals, and microorganisms, including other fungi, as their source of energy—playing a crucial role in nutrient recycling in nature. Mycorrhizal fungi, which establish symbiotic relationships with the roots of plants, have gone hand in hand with plants in the colonization of life on land environments since more than 400 million years. Ectomycorrhizal fungi, in particular, are currently essential in maintaining forest masses worldwide since they establish mutualistic relationships with trees and shrubs mainly. According to the recently named Read’s rule, they dominate ecosystems with low mineralization rates in high-latitude regions with cold and dry climates. Furthermore, they have also been considered the earth’s natural internet, or ‘wood wide web’, because they connect plants and enable them to share nutrients, water, and signal compounds among individuals and species. These networks also help stocking carbon in organic forms from the atmosphere, contributing to climate regulation. Some fungi also establish parasitic relationships with plants and animals, working as an evolutionary force and a selection pressure factor of paramount importance in these groups of living organisms. On top of this ecological and evolutionary relevance, the reproductive structures of fungi, the mushrooms, have shapes and colours that have always fascinated humans. Since early human history, mushrooms have also been an important source of food, medicine, and ceremonial use, all around the world. They also cause death or disease, since deadly and poisonous species exist. Nowadays, they are an important source for the search of new antibiotics, enzymes with industrial use, bioremediation, biofuels, cosmetics, inks, and dyes. In this introductory chapter, we will first describe some remarkable ecological facts related to mushrooms, including members of the three trophic groups previously mentioned. Then, we will provide evidences of the ancient relationships between mushrooms and humans; and, finally, we will analyse the relationships between mushrooms, humans, and nature in different parts of the world, describing and illustrating different realities in five continents
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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