2,099 research outputs found
Carbon Dioxide Capture in Metal–Organic Frameworks
No full textAbstract not availableKenji Sumida, David L. Rogow, Jarad A. Mason, Thomas M. McDonald, Eric D. Bloch, Zoey R. Herm, Tae-Hyun Bae, Jeffrey R. Lon
Opioid Utilization and Cost among elderly and non-elderly Medicare beneficiaries in the United States: A State-level Comparison
No full textPosterObjective compares opioid utilization and cost among elderly and non-elderly Medicare beneficiaries by state. And examines how percent of opioids used by a provider relates to provider and beneficiar
Site-specific metal and ligand substitutions in a microporous Mn(2+)-based metal-organic framework
No full textFirst published online 16 Feb 2016The precise tuning of the structural and chem. features of microporous metal-org. frameworks (MOFs) is a crucial endeavour for developing materials with properties that are suitable for specific applications. In recent times, techniques for prepg. frameworks consisting of mixed-metal or ligand compns. have emerged. However, controlled spatial organization of the components within these structures at the mol. scale is a difficult challenge, particularly when species possessing similar geometries or chem. properties are used. Here, we describe the synthesis of mixed-metal and ligand variants possessing the Mn3L3 (Mn-MOF-1; H2L = bis(4-(4'-carboxyphenyl)-3,5-dimethylpyrazolyl)methane) structure type. In the case of mixed-ligand synthesis using a mixt. of L and its trifluoromethyl-functionalised deriv. (H2L' = bis(4-(4'-carboxyphenyl)-3,5-di(trifluoromethyl)pyrazolyl)methane), a mixed-ligand product in which the L' species predominanantly occupies the pillar sites lining the pores is obtained. Meanwhile, post-synthetic metal exchange of the parent Mn3L3 compd. using Fe2+ or Fe3+ ions results in cation exchange at the carboxylate clusters and metalation at the pillar bispyrazolate sites. The results demonstrate the versatility of the Mn3L3 structure type toward both metal and ligand substitutions, and the potential utility of site-specific functionalisations in achieving even greater precision in the tuning of MOFs. [on SciFinder(R)]Michael Huxley, Campbell J. Coghlan, Alexandre Burgun, Andrew Tarzia, Kenji Sumida, Christopher J. Sumby, and Christian J. Doona
Post-larval development in deep-sea echinoderms
No full textThe post-larval phase is an essential period in the life history of marine invertebrates; vulnerable to high mortality, it ultimately influences the distribution and abundance of adult populations. The post metamorphic ontogenesis of thirty species of deep-sea echinoderms, belonging to three classes (Ophiuroidea, Asteroidea and Echinoidea), is described using scanning electron microscopy. The life history of Ophiocten gracilis is also examined as a case study for future research on post-larval organisms. The analysis of development in ophiuroids reveals that species can be identified from a very early post metamorphic stage, even in congeneric species, contrary to the findings of other authors. The ontogeny of homologous structures is similar within related groups, but may give rise to different adult structures indifferent taxa. The mouth papillae within the ophiurids are serially homologous, originating from the jaw, but the fourth mouth papilla may have a different origin. In the families Ophiactidae, Ophiacanthidae and Amphilepididae examined, the mouth papillae have different origins, as, for instance, the adoral shieldspine or tentacle scale. Data on the post-larval development of Ophiura affinis suggest that this species is more closely related to the genus Ophiocten and a change in the generic status is proposed. Ophiocten gracilis is a bathyal brittle star occurring on both sides of the North Atlantic and its life history is studied in the eastern side of the North Atlantic. In this area, O. gracilis spawns in February/March of each year producing a large number of eggs. Fecundity is estimated to be around 40,000 eggs/ind, with the population of the Hebridean Slope being able to produce probably up to 16 million eggs/m2. Post-larvae start settling in May and numbers settling reached over 3,200 post-larvae/m2. The settling speed of post-larvae in the water column is estimated to be around 500 m/day, settling faster in warmer than colder water. Settling speeds appear to be similar for post-larvae ranging from 0.6 to 0.9 mm in disk diameter. Size at settlement is around 0.6 mm in disk diameter and 5-6 arm segments. The settlement of post-larval O. gracilis on the bottom of the Hebridean Slope also represented a considerable fraction of the particulate organic carbon (POC) flux in the area, reaching over 7% of the total daily flux. This is likely to have a considerable impact in the benthic community as competition and predation and as an additional food source for demersal and benthic organisms. The occurrence of post-larvae of O. gracilis in sediment traps also represented a large problem for POC flux measurements, with ophiuroids consuming part of the flux. In future works with sediment traps, such errors must be taken into account and ophiuroids must be included in the total POC flux. The deep-sea juvenile asteroids of the NE Atlantic could be distinguished to species level from a very early stage of development. The ontogenesis of Porcellanaster ceruleus shows that this species is likely to undergo a shift in habitat and diet during the juvenile phase. This is evidenced by the appearance of the epiproctal cone, the changing of the furrow and apical spines, the early development of the cribriform organ adjacent to the madreporite and the appearance of sediment in the stomach. P. ceruleus is probably a predator on meiofauna and small macrofaunal organisms during the early stages of life, changing to a burrowed life style ingesting sediment particles. Most juvenile sea stars analysed during the present study showed wider bathymetric distribution than their adult counterparts, suggesting that events occurring during the early stages of life are important for the maintenance of the local population structure and diversity in the deep NE Atlantic.The post-metamorphic development of three deep-sea spatangoid echinoids is very similar, but the morphology and formation of fascioles facilitate the distinction of the species examined. Whereas in Hemiaster expergitus and Spatangus raschi the fascioles present in the post-larvae develop to form the adult fascioles, in Brissopsis lyrifera post-larvae there is a juvenile fasciole, which disappears during ontogenesis giving way to the adult fascioles. The function of the juvenile fasciole is unknown in B.lyrifera. The development of the periproct in all spatangoids examined is similar to that described by other authors, with the periproct being initially endocyclic and migrating towards the rear of the animal as development progresses. Post-larvae of the genus Echinus could not be separated into different species, which may be linked to the recent diversification of the genus in the North Atlantic. The widespread settlement of echinoderm post-larvae reported in the present thesis and in other works is thought to have been very important for the colonization of the deep-sea through the supply of stages to deeper areas and selection of pressure adapted animals and subsequent speciation
Ultrasonic Doppler Sensor for Measuring Vehicle Speed in Forward and Reverse Motions Including Low Speed Motions
No full textRosana G. Moreira, Editor-in-Chief; Texas A&M UniversityThis is a Technical article from International Commission of Agricultural Engineering (CIGR, Commission Internationale du Genie Rural) E-Journal Volume 3 (2001): K. Imou, M. Ishida, T. Okamoto, Y. Kaizu, A. Sawamura, and N. Sumida. Ultrasonic Doppler Sensor for Measuring Vehicle Speed in Forward and Reverse Motions Including Low Speed Motions. Vol. III, October 2001
Probing hydration dynamics of metal-organic frameworks by broadband THz pulses
No full textPaper SF1F.1We probe porous metal-organic framework materials (MOFs) using broadband terahertz (THz) pulses. Water molecules that are absorbed by the pores of the material display intermolecular dynamics differing from those of free water.Christian Wolpert, Kenji Sumida, François Blanchard, Koichiro Tanak
Euphlyctis mudigere Joshy, Alam, Kurabayashi, Sumida & Kuramoto 2009
No full textEuphlyctis mudigere Joshy, Alam, Kurabayashi, Sumida & Kuramoto, 2009 New records. INDIA • Karnataka: Udupi: Manipal, Saralebettu, site code I (13.3698°N, 074.7975°E), obs. by MM and RS, 2 Jan. 2017, 95 individuals. Fig. 3D. Identification. The SVL is 28.1–34.8 mm. This species has sparse granules on its dorsum and an unmistakable, inverted, W-shaped mark. It has a pair of dark vocal sacks. The hind feet are fully webbed. This species is the smallest among species of Euphlyctis (Joshy et al. 2009). This species is one of the most abundant frogs throughout the plateau. The call is distinctive, continuous, and repetitive, and only heard during monsoons. Habitat. This species was often heard and seen calling from small to medium-sized ephemeral puddles along roadsides or in gardens. Distribution. This frog is endemic to south-western India.Published as part of Mudke, Madhushri, Gururaja, K. V., Aravind, Neelvara & Singal, Ramit, 2020, Annotated list of anurans from the lateritic plateau of western India with notes on malformations, pp. 685-698 in Check List 16 (3) on pages 691-693, DOI: 10.15560/16.3.68
Terahertz near-field phase contrast imaging
No full textPaper STh4F.5We demonstrate a method, permitting the observation of dielectric loading of hydrocarbons into a porous coordination polymer nanocrystal (PCP), by spatially resolving the phase difference between the near-field responses of two terahertz resonators.F. Blanchard, K. Sumida, C. Wolpert, M. Tsotsalas, T. Tanaka, A. Doi, S. Kitagawa, D. G. Cooke, S. Furukawa, and K. Tanak
Change of Landscape along the Sumida River deduced from photograph
No full textThe Sumida River flowing the central Tokyo, contributed the development of Tokyo through the modern ages. Land use, landscape and waterscape of the river have also changed. The author has assessed the landscape and waterscape since the Meiji Era using photographs, Eight elements on landscape, i.e. “natural land-use”, “urban land-use”, “from of dike”, enviroument of bank”, “plant”, “structure of dike”, “materials of dike”, “close-to-water establishment” were taken for the analysis, and marks were given for each element. The mark is qualitatine five score system in which 5 is given for complete “yes or good” and 1 is complete “no or bad”. The amalysis was made at the Shirahige, Azuma and Ryogoku Bridges, for the era of pre-1900's, 1930's, 1950's and present. The results are presented on radar chart. As the result, it may be said that the river has affected by the human activity since the beginnings of the twentieth century and changed from natural landscape to urban landscape. In 1930's, environment around the Shirahige Bridge kept the natural landscape while urban elemnts has been noted at the Azuma Bridge and Ryogoku Bridge. In 1950's, score of the assessment showed the lowest. At present, since close-to-water embankment has been constructed along the river, therefore, the score has recovered.短報SHORT ARTICLESdepartmental bulletin pape
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