196,597 research outputs found
Ripartitella degreefii Rizinde, Desjardin, Amalfi, & Decock 2023, sp. nov.
No full text<p> <i>Ripartitella degreefii</i> Rizinde, Desjardin, Amalfi, & Decock, <i>sp. nov.</i> Figs. 2, 3</p> <p>[Mycobank: MB842786]</p> <p> Diagnosis:—The species is similar to <i>R. brasiliensis</i> in the basidioma habit, but differs in the paucity of pleurocystidia, a pileipellis as a cutis, and its habitat in mountain areas of tropical Africa.</p> <p> Description:— <i>Basidiomata</i> cespitose, small to medium-sized (Fig. 2A, B). <i>Pileus</i> 25–70 mm diam., convex to planoconvex, becoming applanate and depressed, with (or without) a small obtuse umbo; surface dull, dry, pure white to off-white, disc with (or without) tiny, brownish orange (ferruginous 7C6–7]) scales when young, wearing off with age. <i>Margin</i> decurved to sometimes uplifted in age, centrally pure white to cream (4A3) with white appendiculate veil remnants. <i>Context</i> 1–2 mm thick, soft, white. <i>Lamellae</i> shallowly adnexed to adnate, crowded to very crowded, unequal, (24 (L+l) / cm), with 2–4 series of lamellulae, narrow (2–3 mm deep), with smooth edge, pale yellowish white (4A2). <i>Stipe</i> central to slightly eccentric, terete, subclavate to bulbous, 15–70 (–100) mm long, 3–10 mm broad, solid, annulate, concolorous with pileus, squarrose, with superficial, scattered white velar remnants toward base, glabrous above the annulus. <i>Annulus</i> evanescent, single, membranous, felted, often incomplete, attached to the upper quarter of the stipe. <i>Odor</i> fungoid, <i>taste</i> not tested. <i>Spore print</i> white <i>Hyphal system</i> monomitic, composed of generative hyphae with clamp connections in all tissues. <i>Pileipellis</i> a cutis, made up of repent, subparallel, radially oriented, cylindric hyphae, 3.5 <i>–</i> 7 µm diam, smooth, thin-walled. <i>Pileus squamules</i> composed of subcatenulate, rarely encrusted hyphae, 5 <i>–</i> 10 µm diam. <i>Pileitrama</i> made up of interwoven hyaline, smooth, thin- to slightly thick-walled, hyphae, 2.5–7 µm diam. <i>Lamellar trama</i> similar to pileitrama. <i>Stipitipellis</i> a layer of ±parallel, longitudinally oriented hyphae, with scattered clusters of subcatenulate elements similar to those of pileipellis (Fig. 3C), individual cells 3.5 <i>–</i> 7 µm diam, smooth, thin-walled.</p> <p> <i>Basidiospores</i> hyaline (Fig. 3G, H), broadly ellipsoid to subglobose, thin-walled, verrucose, inamyloid, acyanophilous, (3.5–) 4–5 × 3–3.8 µm (n = 30, mean = 4.3 × 3.4 µm, Q = 1.13–1.5). <i>Basidia</i> with a basal clamp, clavate, with 4 sterigmata (Fig. 3F), not siderophilous, 14–24 × 6–8 µm. <i>Pleurocystidia</i> absent or present (Fig. 3D), then scarce, difficult to observe, with a basal clamp, lageniform, thin- to thick-walled, apically smooth or slightly, finely or coarsely incrusted (Fig. 3E), 32–40 × 5.0–7.5 µm, the apical digitate part 2–2.5 µm diam (mean =36 × 6.5 µm, 2.3 µm in the apical section). <i>Cheilocystidia</i> not observed.</p> <p>Distribution:—AFRICA. Known from the Eastern Democratic Republic of the Congo and S„o Tomé.</p> <p> Ecology (substrate, host, habitat):— On fallen trunks of angiosperms, including, in DRC, <i>Xymalos monospora</i> (Harv.) Baill. (Monimiaceae, locally named “Cinyalubombo”), mountain forests, at 1100 and 2139 m a.s.l.</p> <p>Etymology:—The species name is a tribute to Jérôme Degreef, scientific director at Meise Botanic Garden for his devotion to African mycology and his efforts for promoting the training of students from tropical Africa.</p> <p> Material examined:—AFRICA. Democratic Republic of the Congo, South Kivu: Kahuzi Biega mountain range, Kahuzi Biega National Park, 2.331733°S, 28.74848°W, 2139 m a.s.l., on fallen trunk of <i>Xymalos monospora</i> (Harv.) Baill. (Monimiaceae), November 2018, <i>J.C. Rizinde</i> leg., <i>RHJ 305</i> (BR #5020189043549, <b>Holotype)</b>, culture exholotype MUCL 57374; SÃO TOMÉ: Macambrara radio antenna area; 0.27595°N, 6.608767°E, 1100 m elev., 25 April 2008, <i>D. E. Desjardin</i> leg. <i>DED 8323</i>; SÃO TOMÉ; Macambrara radio antenna area; 0.27595°N, 6.608767°E; 1100 m elev., April 2006, D. E. Desjardin leg., <i>DED 7937</i> (but material lost in transit to the USA).</p> <p> Notes:— <i>Ripartitella degreefii</i> is phylogenetically distant from all other <i>Ripartitella</i> known to date (Fig. 1). Morphologically, <i>R. degreefii</i> is similar in many respects to <i>R. brasiliensis</i> (Capelari & Asai 2009, Desjardin & Perry 2017), but differs in having a pileipellis as a cutis (Fig. 3C) as opposed to a trichoderm (Capelari & Asai 2009), scarce (Fig. 3D–E) in contrast to abundant pleurocystidia (Capelari & Asai 2009), and a distribution in Afromontane forests in contrast to lowland neotropics. <i>Ripartitella brasiliensis</i> also has dense, brown to reddish brown squamules, covering the whole cap when young (Capelari & Asai 2009, Battistin <i>et al</i>. 2016). Squamules are variably present in young specimens of <i>R. degreefii</i> (Fig. 2), but soon wear off with age.</p> <p> <i>Ripartitella degreefii</i> is known so far from two collections originating from two spots of medium elevation forests, in the continental and insular Afromontane range, in the Albertine rift (DRC) and S„o Tomé. It is the first <i>Ripartitella</i> described from Tropical Africa. Pegler (1977) reported <i>R. brasiliensis</i> from Eastern Africa, in Kenya, Tanzania, and Uganda. He described the eastern African collections as lacking cystidia (Pegler 1977). Pleurocystidia were observed in <i>R. degreefii</i>, in both specimens available. However, they are scarce and difficult to see. Desjardin and Perry (2017) reported <i>R. degreefii</i> under <i>R. brasiliensis</i> from S„o Tomé, stating that it matched “nicely the description of African material provided by Pegler (1977) ”. A closer examination of the S„o Tomé specimen revealed the presence of scarce pleurocystidia. The identity of the specimens cited by Pegler (1977) remains to be ascertained but they could represent <i>R. degreefii</i>.</p>Published as part of <i>Hakizimana, Jean-Claude Rizinde, Amalfi, Mario, Degreef, Jérôme, Desjardin, Dennis & Decock, Cony, 2023, Ripartitella degreefii (Tricholomataceae), a new species from tropical Africa, pp. 195-207 in Phytotaxa 597 (3)</i> on pages 202-204, DOI: 10.11646/phytotaxa.597.3.1, <a href="http://zenodo.org/record/7958574">http://zenodo.org/record/7958574</a>
POTENTIOMETRIC AND SPECTROSCOPIC STUDIES ON THE COORDINATION ABILITY OF COPPER(II) TO 2-AMINO-2-(2,3-DIDEOXY-BETA-D-ERYTHRO-HEX-2-ENOPYRANOSYL)PROPIONIC ACID
No full textThe copper(II)-binding behaviour of 2-amino-2-(2,3-dideoxy-beta-D-erythro-hex-2-enopyranosyl)propionic acid (hpap), a precursor of a C-glycosyl-alanine, in aqueous solution is described
COORDINATION ABILITY OF DIGALACTOSAMINE, AND DIGALACTURONIC AND TRIGALACTURONIC ACIDS - POTENTIOMETRIC AND SPECTROSCOPIC STUDIES OF CU(II) COMPLEXES
No full textPotentiometric and spectroscopic (EPR, CD, and absorption spectra) data obtained for digalactosamine and di- and trigalacturonic acid with Cu(II) have shown that the di-sugar binding is usually less efficient than that of monomeric units while the tri-sugar can probably simultaneously use two terminal subunits to coordinate a metal ion. The latter result may have some relevance for metal binding by polysaccharides. All sugar ligands use amino or carboxylate functions as an anchor site, as in monomeric units. Bulky oligomeric ligands protect formation of the bis complexes. This causes the hydrolysis to be a dominant process at higher pH
Potentiometric and spectroscopic studies in the coordination ability of copper (II) to 2-(2'-3'-dideoxy-beta-D-erythro-2-hexenepyranosyl)-2-amino propionic acid
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Neuro-Fuzzy Modeling for Fault Diagnosis in Rotating Machinery
No full textMalfunctions in machinery are often sources of reduced productivity and increased maintenance costs in various industrial applications. For this reason, machine condition monitoring has been developed to recognize incipient fault states. In this paper, the fault diagnostic problem is tackled within a neuro-fazzy approach to pattern classification. Besides the primary purpose of a high rate of correct classification, the proposed neuro-fuzzy approach aims at obtaining also a transparent classification model. To this aim, appropriate coverage and distinguishability constraints on the fuzzy input partitioning interface are used to achieve the physical interpretability of the membership functions and of the associated inference rules. The approach is applied to a case of motor bearing fault classification
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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