432 research outputs found
Story of Adeline Yen Mah
No full textProducer, Eleanor Morris ; narrator, Connie Booth.Adeline Yen Mah, the author of Falling leaves, traces her and her family's life from Shanghai of the 1930s to the Cultural Revolution, through her life as a doctor in California
Wallastra elenderae Mah 2018, n. gen.
No full textWallastra elenderae n. gen. n. sp. Figure 37 A–G Type species. Wallastra elenderae n. sp. by monotypy. Etymology. This genus and species are named for dear friend, opera singer, and co-author of the textbook Introductory Physics, Ms. Elender Wall (1969–2016). Diagnosis. Body strongly stellate (R/r=3.46) with elongate, slender arms, weakly curved interradial arcs (Fig. 37A, F). Abactinal plates bare, surface mostly bare and smooth (Fig. 37B), especially on distal disk regions adjacent to superomarginals and along arms. Central disk plates with one to several, widely distributed button-like granules. Superomarginals wide to quadrate in shape, with mostly bare surface, or widely distributed coarse granules occur (Fig. 37D). Each actinal plate covered with closely articulated granules, most plates with a single large bivalve pedicellaria (Fig. 37E). Furrow spines four or five (Fig. 37G). Comments. Based on comparisons with other goniasterid taxa, the species described here cannot be easily reconciled with known goniasterid genera, and therefore the new genus Wallastra is recognized. Wallastra n. gen. lacks the crystalline tubercles embedded in the surface of the abactinal plates, which identifies all species of Astroceramus as well as the superomarginals abutted over the radius of each arm. Most species of Astroceramus also possess one or two enlarged subambulacral spines that are absent from Wallastra. Abactinal plates on Wallastra n. gen. possess one to approximately eight to 10 coarse granules embedded in the plate surface but are otherwise bare and smooth. Granules abruptly disappear on arm plates where abactinal plates become flatter and are entirely devoid of surficial accessories. This character is reminiscent of the abrupt change between plates that defines the difference between Circeaster and Lydiaster. In Circeaster, abactinal arm plates are abruptly larger whereas those in Lydiaster remain relatively similar in size on the arm and disk. However, Lydiaster possesses much larger and wider marginal plates with a stronger abactinal facing, a thicker and more stout body shape and widespread spinelets that are absent from Wallastra n. gen. Two species of Circeaster, C. sandrae (South and Central Pacific) and especially C. pullus (North Pacific) display similar abactinal and marginal plate patterns to both Wallastra n. gen. and Astroceramus. Occurrence. Solomon Islands and Western Indian Ocean, between Mayotte and the Glorioso Islands, 550–836 m. Description. Body strongly stellate (R/r=3.46), arms elongate, tapering. Interradial arcs weakly curved to nearly straight (Fig. 37A). Abactinal surface flat, composed of round to polygonal abutted plates (Fig. 37A, B), which are flush with superomarginal plate surface (Fig. 37D). Approximately three rows of abactinal plates (at R= 10.4 cm) extending along arm to terminus (Fig. 37C), decreasing in number to a single row of wide then very narrow, irregularly shaped, strongly convex plates along distalmost arm region. Plates largest and most polygonal along papular (radial regions) with smallest and most irregular plates occurring interradially. Plates with discrete peripheral row of quadrate to polygonal shaped granules,12–30, mostly 15–25, with approximately four to five granules present per side (Fig. 37B). Peripheral granules largest on disk occupying 1/3 to 1/5 of the total width of each plate becoming substantially smaller on arm plates, occupying only approximately 1/6 to 1/10 of the total plate distance. Peripheral granules on arm more rounded and nearly flush with plate surface versus those on disk which are raised and sit above the plane of the abactinal plate surface. Abactinal plate surfaces on the disk possess one to 15 (mostly two to six) large, coarse widely spaced granules but are otherwise smooth, bare and are mostly devoid of other structures or accessories. Granules are widely spaced on all but the plates flanking the polygonal shaped madreporite. Of the seven plates which flank the madreporite, four possess abundant and closely spaced coarse granules all but covering the plate surface. This side of the madreporite with granule-covered plates with one to two irregularly spaced rows of plates with similarly abundant granule-covered plates. Two plates observed each with a large paddle-shaped pedicellaria (approximately 1.5–2.0 mm width) present in the center of each plate. These large coarse button-like granules decrease in number farther away from the center of the disk, disappearing completely on the disk edge, arm base and along the surface of the arm plates. The absence of the button-like granule leaves a distinct concavity on the plate where it has been removed, otherwise the surface is flat and smooth. Papulae were extended on specimen examined with six numbering around each plate along radial regions at the base of each arm extending from the radial region of the disk. Superomarginal and inferomarginal plates, approximately 62–66 per interradius. Plates wide, quadrate in shape with flattened surface interradially but becoming more elongate and tumid distally, becoming much more strongly convex adjacent to arm tip. Superomarginals and inferomarginals with 1:1 correspondence interradially becoming more offset distally, showing a more zigzag contact along the arm. Distalmost three to four superomarginals abutted over midline. Superomarginals with one to approximately 25 coarse, round button-like, widely spaced granules present on each plate surface, granules are most abundant interradially, gradually decreasing and then disappearing completely along plates present on the arm (Fig. 37D). When removed, disk granules leave a distinct, concave pitting on the superomarginal plate surface. Inferomarginal plate surfaces show same general pattern but interradial plates also possess a dense row of coarse, polygonal granules identical to those which compose the peripheral granule layer around the marginal plates (Fig. 37D). Peripheral granules around superomarginals, polygonal to narrowly quadrate, approximately 30–80, mostly 40–60 forming (15 per edge) narrow border around superomarginal plates becoming nearly indistinct near arm terminus. Peripheral granules around inferomarginals similar in size and number except for those in contact with granules on the actinal plate surface, which are slightly larger than those on the other sides of the inferomarginal plate. Granules on the inferomarginal/actinal plate contact are much larger, coarser, in close contact, and similar in overall appearance. As with superomarginals, granules are most numerous interradially, with numbers decreasing and disappearing entirely on inferomarginal plate surface along the arm, especially distally adjacent to the arm terminus. Terminal plate is large, triangular in shape, approximately the size of four adjacent superomarginal plates, with bare surface and a large blunt spine on the tip. Actinal surface composed of approximately three full series in chevron-like pattern, with irregular incomplete series adjacent to contact with inferomarginal plates (Fig. 37E). Actinal plates quadrate to polygonal in outline, all plates on disk covered by coarse, closely distributed polygonal to round granules, four to 12 per plate. Approximately 1 granule counted along a 1.0 mm line. Actinal plates along arm with decreasing number of granules, in some cases disappearing from plate surface. Large (1.0–2.0 mm wide) trapezoid shaped pedicellariae (Figs. 37E, G), each with short, jagged complimentary valves, numbering one per plate, occurring on approximately 50% of actinal plates, variably present throughout each interradius. Furrow spines four in a linear series increasing to five distally, quadrate to triangular in cross-section with spines flattening out farther along arm, becoming individually narrower and more prominent (Fig. 37G). Variably, some spines are flattened and are more wedge-shaped. Furrow spines mostly blunt and smooth but most proximal spines with notches or some texturing on each spine tip. Furrow spines are set off by a discrete space, then two to four short triangular to rounded subambulacral spines, less than 25% of the length of each furrow spine. When only two subambulacrals are present, they occur on either side of the adambulacral plate, flanking a large bivalve pedicellaria with large rectangular valves with jagged tips, similar to those on actinal surface (Fig. 37G). Subambulacral spines transition from two short enlarged granules to a single enlarged blunt spine on distalmost adambulacral plates. Subambulacral pedicellariae occur in a continuous series along the adambulacral plates on the disk but gradually disappear along the transition from disk to arm. Pedicellariae are in turn, flanked by a row of three, large, blunt spines, quadrate to rounded in cross-section, which are two to three times as thick as the adjacent actinal granules. Pedicellariae set off from both the furrow spines and the thickened subambulacrals by discrete bare spaces. Pedicellariae are absent on a minority of plates, and are replaced by a series of two to four small polygonal granules similar to those on the actinal surface. Remainder of adambulacral surface covered by four to 20 thick, mostly 10 to 15 polygonal granules, best developed along arm after pedicellariae series has terminated. Oral plates with six to eight thick spines, ranging from thickened quadrate to flattened and triangular in crosssection with thin, flattened paddle like spines projecting into oral region from each paired oral plate. Oral plates with four or five thick subambulacral spines, each two to four times as thick as the furrow spines with six to eight, short paired, irregular, triangular granules on each side of the oral plate contact along the midline. Color in life, disk is light orange with darker orange arms and solid dark marginal plates. Material Examined. Holotype: MNHN-IE-2013-17165. Western Indian Ocean, between Mayotte and the Glorioso Islands, 12° 18 'S, 46° 27' E to 12 ° 17 'S, 46 ° 28' E, 842– 836m, Coll. S. Samadi et al. BIOMAGLO DW 4792, 22 Jan 2017, leg 1. 1 wet spec. R=10.4 r=3.0. Paratype: IE-2007-1291. Solomon Islands 8°16’S 160° 43’E, 550 m, Coll. Richer & Boissellier, 15 Sept. 2007. N/ O Alis, SALOMONBOA 3 DW 2792 1 wet spec. R=9.3 (arm twisted) r=3.2Published as part of Mah, Christopher L., 2018, New genera, species and occurrence records of Goniasteridae (Asteroidea; Echinodermata) from the Indian Ocean, pp. 1-116 in Zootaxa 4539 (1) on pages 98-100, DOI: 10.11646/zootaxa.4539.1.1, http://zenodo.org/record/261591
Análise da gestão do Museu de Anatomia Humana da Faculdade de Medicina da Universidade de Brasília MAH/UnB (2015-2020)
No full textTrabalho de Conclusão de Curso (graduação)—Universidade de Brasília, Faculdade de Ciência da Informação, 2021.O presente trabalho vai fazer uma análise da gestão do Museu de Anatomia Humana da
Universidade de Brasília - MAH/UnB, entre os anos de 2015-2020. Através do histórico da
instituição, análise do tratamento do acervo, relato de funcionários e ex-funcionários, a autora
pretende verificar como o trabalho técnico do profissional de museu proporciona mudanças ao
ambiente museológico.The following work will presents an analysis of the management of the Museum of Human
Anatomy of the University of Brasilia - MAH / UnB (Museu de Anatomia Humana da
Universidade de Brasília MAH - UnB), between the years 2015-2020. Through the history of
the institution, analysis of the treatment of the collection, reports from employees and former
employees, the author intends to verify how the technical work of the museum professional
provides changes to the museum environment
HS-1371, a novel kinase inhibitor of RIP3-mediated necroptosis
No full textNecroptosis is a type of programmed cell death that usually occurs under apoptosis-deficient conditions. Receptor-interacting protein kinase-3 (RIP3, or RIPK3) is a central player in necroptosis, and its kinase activity is essential for downstream necroptotic signaling events. Since RIP3 kinase activity has been associated with various diseases, the development of specific RIP3 inhibitors is an attractive strategy for therapeutic application. In this study, we identified a potent RIP3 inhibitor, HS-1371, by the extensive screening of chemical libraries focused on kinases. HS-1371 directly binds to RIP3 in an ATP-competitive and time-independent manner, providing a mechanism of action. Moreover, the compound inhibited TNF-induced necroptosis but did not inhibit TNF-induced apoptosis, indicating that this novel inhibitor has a specific inhibitory effect on RIP3-mediated necroptosis via the suppression of RIP3 kinase activity. Our results suggest that HS-1371 could serve as a potential preventive or therapeutic agent for diseases involving RIP3 hyperactivation © The Author(s) 201
Pung chow, the game of a hundred intelligences; also knows as mah-diao, mah-jougg, mah-cheuk, mah-juck and pe-ling.
No full textMode of access: Internet
Circeaster marcelli Koehler 1909
No full textCirceaster marcelli Koehler, 1909 Circeaster marcelli Koehler, 1909: 84, pl. IV, figs 1, 2, pl. VI, fig. 1. — Clark 1993: 251. MATERIAL EXAMINED. — No specimens available for examination. DISTRIBUTION. — Recorded from 7°23'N, 75°44'E in the Indian Ocean. 1926 m (1053 fms). DIAGNOSIS. — R/r = 2.67. Arm plates significantly larger than disk plates.Transition abrupt between abactinal disk and arm plates. Abactinal granules absent. Superomarginals not abutting at midline, arm plates continuous to terminal. Interradial arcs linear.Spinelets and granules with spiny tips cover superomarginal, inferomarginal plates, actinal surface. Seven to eight thick, blunt furrow spines. Prominent paddle-like toothed pedicellariae, separated from furrow spines. Granules identical to actinal surface present on remainder of adambulacral plate. APOMORPHY LIST. — Nodes 14 to Circeaster marcelli: 1.4, abactinal accessories absent; 1.6, no size, accessories absent. DESCRIPTION See Koehler (1909; translation in English of the description is available from the author).Published as part of Mah, Christopher L., 2006, Phylogeny and biogeography of the deep-sea goniasterid Circeaster (Echinodermata, Asteroidea, Goniasteridae) including descriptions of six new species, pp. 917-954 in Zoosystema 28 (4) on page 935, DOI: 10.5281/zenodo.452546
TiF<sub>3</sub> catalyzed MgH<sub>2</sub> as a Li/Na ion battery anode
No full textMgH2 has been considered as a potential anode material for Li ion batteries due to its low cost and high theoretical capacity. However, it suffers from low electronic conductivity and slow kinetics for hydrogen sorption at room temperature that results in poor reversibility, cycling stability and rate capability for Li ion storage. This work presents a MgH2–TiF3@CNT based Li ion battery anode manufactured via a conventional slurry based method. Working with a liquid electrolyte at room temperature, it achieves a high capacity retention of 543 mAh g−1 in 70 cycles at 0.2 C and an improved rate capability, thanks to the improved hydrogen sorption kinetics with the presence of catalytic TiF3. Meanwhile, the first realization of Na ion uptake in MgH2 has been evidenced in experiments.Accepted Author ManuscriptChemE/Materials for Energy Conversion and Storag
Insight on polysulfides harness: COFs for Li-S batteries
No full textNine COF designs have been selected for their porosity, surface area and pore surface chemistry, synthesized or reproduced via a solvothermal method with different degrees of success in terms of crystallinity and porosity. Through various spectroscopy techniques (IR, Raman, XPS), together with imaging tools (SEM, TEM) and system specific analysis (XRD, N2 adsorption) it was possible to characterize the samples in all their aspects and reveal the hidden mechanisms of their nucleation. Three COFs (TAPB-DMTP 100, TAPB-DMTP 50 and DhaTab 100) had high degree of crystallinity and reasonable BET surface areas (1906, 1952, 437 m2 g-1respectively ). IISERP-CON1 was quite amorphous and adsorbed the equivalent of 125 m2 g-1. Nonetheless, as well as TAPB-DMTPs, it became for the first time cathode in sulphur and Li2S batteries. Once the battery fabrication reached its optimum, the maximum reached capacities have been 470 mAh g-1 (B3) and 991 mAh g-1 (B6) and 532 mAh g-1 (B4) in the first half cycle at 0.01C. When run at 0.1C, B3 could deliver 360 mAh g-1 after the first discharge. The fact that IISERP-CON1 delivered the highest capacity must be attributed to the high density of adsorption sites and the strong link in between COF and Li2S that was observed with XPS. In order to reach longer cycling times, it is important that both an ordered porous structure and a rational trapping sites arrangement are achieved in the same COF.Materials Science and Engineerin
Improving the Cycle-life of Naphthoquinone-based Active Materials by Their Polymerization for Rechargeable Organic Batteries
No full textAbstractTo increase the cycle-stability of rechargeable batteries using an organic positive-electrode material, we synthesized a polymer from a 5,8-dihydroxy-1,4-naphthoquinone (DHNQ) skeleton, which potentially undergoes a four-electron transfer redox reaction. The polymeric material (PDHNQ) was synthesized by the condensation reaction between DHNQ and formaldehyde under acidic media conditions. The initial capacity of the electrode using the monomer (DHNQ), 193 mAh/g, quickly decayed to 56 mAh/g after 100 cycles. On the other hand, the electrode incorporating the prepared PDHNQ showed the higher initial discharge capacity of 256 mAh/g and a longer cycle-life, retaining about 133 mAh/g after 100 cycles
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