8,614 research outputs found
Clenchiella iriomotensis Ponder, Fukuda & Hallan, 2014, n. sp.
No full textClenchiella iriomotensis n. sp. Figures 1, 3, 4, 11– 14 Clenchiella sp.; Yamashita et al., 2005: 48, 51, 61, fig. 1; Fukuda, 2012: 40, text fig. Etymology. Named after the type locality, Iriomote Island. Types and type locality. Holotype: In shallow tide pools on the back marsh with mangrove trees of the Urauchi River Estuary, 1500 m SW from the Urauchi Bridge, Iriomote Island, Taketomi-chô, Yaeyama-gun, Okinawa Prefecture, Japan, 24 ˚ 23 ’ 53 ” N, 123 ˚ 45 ’ 53 ” E, 22 Nov. 2004. Coll. H. Fukuda, H. Yamashita, M. Kimura, K. Suzukida, K. Kuroda and C. Mori (AMS, C. 462961). Paratypes: Same data (AMS, C.460377, 18 spms; AMS, C. 445413. 20 + spms; OKCAB, M 17940, 100+ spms). Material examined. Type material. Iriomote Island, Okinawa; mangrove swamp in Nakara River Estuary, Shirahama, 24 ˚ 21 ’ 31 ” N, 123 ˚ 45 ’09” E (OKCAB, M17940, 9 spms); Maera River Estuary, Komi, 24 ˚ 18 ’ 47 ” N, 123 ˚ 54 ’ 19 ” E (OKCAB, M17942, 9 spms); swamp 200 m SW from Ôhara Elementary School, Ôhara, 24 ˚ 16 ’ 15 ” N, 123 ˚ 52 ’ 35 ” E (OKCAB, M17943, 3 spms); among green algae in mangrove swamp around Urauchi-bashi Bridge, 24 ˚ 24 ’ 10 ” N, 123 ˚ 46 ’ 34 ” E (OKCAB, M17939, 14 spms; M17944, 31 spms). Distribution. Known only from Iriomote Island, SW Okinawa. Description. Shell. Shell small (up to 2.3 mm in maximum diameter; Table 3), spire flat (Figs 1 J–L and 3 H–L). Protoconch not elevated above spire, about 1.4 whorls, surface slightly worn in available specimens but protoconch I with traces of few widely spaced spiral threads, termination indistinct; protoconch II about 0.75 whorl, apparently smooth, terminated by very weak varix. Teleoconch of about 2 whorls, rounded except for weak angulations from two carinae, one mid-dorsal, one mid-basal; whole surface sculptured with distinct spiral sculpture: on inner dorsal part of shell spirals weak to subobsolete, with linear interspaces; on outer side of dorsal carina spiral lirae have interspaces up to twice their width while on periphery lirae weaker to subobsolete, with narrow interspaces; at end of penultimate whorl about 5–6 lirae on outer side of dorsal carina, spirals on inner side subobsolete; irregularly spaced commarginal growth lines cross spirals. Periphery evenly convex. Outer base with spiral sculpture as on outer dorsal surface. Base evenly convex except for mid-basal carina; umbilicus wide (more than half width of base), spiral sculpture weaker than on base, becoming subobsolete within. Sutures moderately impressed. Aperture near circular, with simple, slightly thickened peristome, external varix weakly to well developed, narrow, slightly behind edge of aperture. Periostracum variable in colour between individuals; some are reddish brown, some beige, some bluish grey, with few individuals with combinations of these colours. Shell white. Operculum. Horny, near circular, of up to 8 slowly increasing whorls (Fig. 4 C, D). Interior with narrow, raised edge to muscle attachment area close to slightly thickened, ridge-like columellar edge and very small, hardly raised nipple in middle. Head-foot. Living animal generally similar to Cl. victoriae. Snout with several narrow longitudinal stripes of black pigment, and black near distal bands on tentacles (Fig. 11). Bright lemon yellow pigment cells scattered along tentacles. Black pigment also found on neck and around eyes, anterior lateral foot and lateral stripe along dorsal sides of foot. Foot expanded laterally anteriorly and anterior edge indented; tapers posteriorly to point. Opercular lobe thin. Sole translucent white except for scattered white mucous gland cells. Long, stationary cilia on distal ends of tentacles. Cilial tufts on left tentacle not noted. Ctenidium. About 30 filaments. Radula. Typical of family. Cusp formulae 4 + 1 +4, 3– 4 + 1 + 4 -5, 20–22, 23– 25, median cusps of central and lateral teeth long (twice as long as adjacent cusps or longer), slender, pointed; other cusps on all teeth slender, pointed (Fig. 12). Gut. Anterior oesophagus with two weak folds; rectum with one tight loop. Penis. Moderately long (Fig. 13 A–C), wide distally and narrow proximally; on distal portion two large, distinct, round lobes, one on right edge, another on middle part. Narrow papilla arising from left edge of penis, with pointed tip. Penial duct very slightly undulating to almost straight. Oviduct. Albumen gland slightly shorter than capsule gland (Fig. 13 D, E). Coiled oviduct wide, with single very large coil. Seminal receptacles short, about equal in size. Ventral channel rather long, narrow, straight. Bursa extremely large, elongately-oval, lying on left side of oviduct gland, about 1 / 3 behind posterior wall of mantle cavity; posterior part as wide as anterior part; bursal duct with C-shaped curve at anterior end on left side of capsule gland. Genital opening simple, on ventral edge of meeting point of ventral channel and bursal duct. Nervous system. As for Cl. bicingulata. Remarks. The shell of this species is very similar to that of both Cl. varicosa and Cl. bicingulata. The spiral cords are weaker and fewer in Cl. varicosa, as are the main keels, while Cl. bicingulata has stronger spiral sculpture, especially on the periphery and the aperture is more strongly inclined. The rectum of Cl. iriomotensis has only one loop, a character shared with Cl. varicosa whereas other species in the family have two loops (condition in Cl. victoriae unknown). These two latter species also have a somewhat similar penial morphology, although one of the distal glands is smaller in Cl. varicosa. Clenchiella iriomotensis differs significantly, however, from Cl. varicosa in the female genital system, with the bursa copulatrix having a very different configuration (cf. Figs 10 C, D and 13 D, E), although it is rather similar to that of Cl. bicingulata.Published as part of Ponder, Winston F., Fukuda, Hiroshi & Hallan, Anders, 2014, A review of the family Clenchiellidae (Mollusca: Caenogastropoda: Truncatelloidea), pp. 101-153 in Zootaxa 3872 (2) on pages 123-126, DOI: 10.11646/zootaxa.3872.2.1, http://zenodo.org/record/25322
Coleglabra Ponder, Fukuda & Hallan, 2014, n. gen.
No full textColeglabra n. gen. Type species: Colegrabra nordaustralis n. sp. — Coleglabra misspelt Etymology. Colis (Latin): penis; glabra (Latin): smooth, unadorned. Gender feminine. Diagnosis. Shell minute (up to 1.9 mm in diameter). Whorls with few dorsally distinct spiral cords and indistinct spirals on base; strong spiral keels absent. Aperture near circular, peristome simple, prosocline, external varix absent (Figs 28 D–I and 29 F–K). Operculum simple with no peg or white deposit on inner side. Head-foot colourless with no pigment. Penis long, slender, tapering, with no distinct swellings or glands; arising from right side of head behind right eye; tip pointed, with no distinct papilla. Bursa copulatrix large, about 1 / 2 behind posterior wall of mantle cavity; bursal duct extremely wide, forming large, round chamber at anterior part. One seminal receptacle. Remarks. The shells of members of this genus are similar to that of Colenuda kessneri in having a few spiral threads on the dorsal surface of the shell and weaker spirals on the base, lacking spiral keels and in having a relatively narrow umbilicus and a low to moderate spire (flat to slightly sunken in Clenchiella and some species of Coliracemata). The shell of Coleglabra differs most obviously from that of Colenuda in having a simple peristome, that of Colenuda having a wide, shallow excavation and in lacking any external varix. As in Coliracemata, the head-foot is unpigmented but it is not in the other two genera. The penis, like that of Colenuda, lacks distinct lobes or glands and, like Colenuda, the operculum lacks a central projection. The shell resembles that of some species of Coliracemata in having a slightly raised spire, no varix and rather weak spiral sculpture. The spirals are slightly irregular but less obviously wavy than they are in most species of Coliracemata. The edge of the aperture, viewed dorsally, is straight in species of Coliracemata and convex in the two known species of Coleglabra. Only the type species of Coleglabra is known anatomically. Another species is provisionally included in this genus based on its similar shell.Published as part of Ponder, Winston F., Fukuda, Hiroshi & Hallan, Anders, 2014, A review of the family Clenchiellidae (Mollusca: Caenogastropoda: Truncatelloidea), pp. 101-153 in Zootaxa 3872 (2) on page 146, DOI: 10.11646/zootaxa.3872.2.1, http://zenodo.org/record/25322
Open Data 2015: The contribution of attentional lapses to individual differences in visual working memory capacity
No full textAdam, K.C.S., Mance, I., Fukuda, K., and Vogel, E.K. (2015). The Contribution of Attentional Lapses to Individual Differences in Visual Working Memory Capacity. Journal of Cognitive Neuroscience, 27(8): 1601-1616.
doi: 10.1162/jocn_a_0081
Expression, phosphorylation, and mRNA-binding of heterogeneous nuclear ribonucleoprotein K in Xenopus oocytes, eggs, and early embryos
No full textHere we show that heterogeneous nuclear ribonucleoprotein K (hnRNP K), a member of the K homology domain-containing proteins, is expressed in Xenopus immature oocytes, unfertilized eggs, and early embryos. Fertilization or egg activation treatment involving upregulation of the egg tyrosine kinase Src promotes a rapid and transient tyrosine phosphorylation of hnRNP K. HnRNP K is also phosphorylated on serine/threonine residues in unfertilized eggs, dephosphorylated after fertilization, and re-phosphorylated during the premitotic phase of early embryogenesis. In vitro, Src and mitogen-activated protein kinase (MAPK) were capable of phosphorylating hnRNP K on tyrosine and serine/threonine residues, respectively. In support of this, pretreatment of oocytes, eggs, or embryos with inhibitors for Src (PP2) and MAPK (U0126) blocked effectively the phosphorylation of hnRNP K. We also identify some maternal mRNAs that coimmuno-precipitate with hnRNP K in unfertilized eggs. Specific binding of these mRNAs to hnRNP K was verified by reverse transcriptase-polymerase chain reaction (RT-PCR). In addition, real-time PCR analyses revealed a subset of the mRNAs whose binding to hnRNP K might be up or downregulated in activated eggs. In vitro binding assay with the use of poly U monopolymeric RNA-coupled beads demonstrated that the RNA-binding property of hnRNP K is negatively regulated by tyrosine phosphorylation and positively or neutrally regulated by serine/threonine phosphorylation. Taken together, it is attractive to suggest that hnRNP K is in association with certain pools of maternal mRNAs whose translational activation are modulated by the Src/MAPK phosphorylation of hnRNP K during oocyte-egg-embryo transition
The virtues of Fukuda laboratory of crystal growth
No full textAbstractThe author, dealing with crystal growth of II–VI, IV–VI and III–V compounds for more than 25 years, describes his impressions on the state of art of the basic research in the field of bulk growth of electronic materials in Japan, obtained during his stay from 1993 to 1994 as invited professor at the laboratory of Professor Tsuguo Fukuda at the Institute for Materials Research of Tohoku University in Sendai. He learned that the future generations of electronic and optical devices require original ideas and unconventional steps towards new bulk crystal growth technologies combined with a close teamwork between academic laboratories and industry
Evaluation of Automated Theorem Proving on the Mizar Mathematical Library
No full textContains fulltext :
83733.pdf (Publisher’s version ) (Closed access)ICMS 201
X-ray diffraction study of ferroelectric and antiferroelectric liquid crystal mixtures exhibiting de Vries SmA*-SmC* transitions
No full textIn this Rapid Communication, results on smectic layer thickness, using synchrotron radiation x-ray diffraction, for different mixtures of ferroelectric and antiferroelectric liquid crystals are given. We find that with an increased ferroelectric component in the mixtures, the layer shrinkage at the de Vries SmA*-SmC* transition increases. This observation can be used to explain our previously observed behaviors [U. Manna, J.-K. Song, Yu. P. Panarin, A. Fukuda, and J. K. Vij, Phys. Rev. E 77, 041707 (2008)] that the soft-mode dielectric strength decreases, the Landau coefficient increases, and the Curie-Weiss temperature range decreases with increased ferroelectric component in the mixture exhibiting de Vries SmA*-SmC* transition.In this Rapid Communication, results on smectic layer thickness, using synchrotron radiation x-ray diffraction, for different mixtures of ferroelectric and antiferroelectric liquid crystals are given. We find that with an increased ferroelectric component in the mixtures, the layer shrinkage at the de Vries SmA*-SmC* transition increases. This observation can be used to explain our previously observed behaviors [U. Manna, J.-K. Song, Yu. P. Panarin, A. Fukuda, and J. K. Vij, Phys. Rev. E 77, 041707 (2008)] that the soft-mode dielectric strength decreases, the Landau coefficient increases, and the Curie-Weiss temperature range decreases with increased ferroelectric component in the mixture exhibiting de Vries SmA*-SmC* transition
View to the U: An eye on UTM Research
No full textThis is an audio recording from the podcast series "View to the U: An eye on UTM research".On this episode of VIEW to the U we highlight Professor Keisuke Fukuda, also known as K, who talks about his research related to visual working memory and how memory guides behaviour. But along with that, K also talks about other studies his lab is taking on such as why is it so hard to forget things we would rather not remember and how memory distortion can come into play when we are processing information.
K also talks about some of the daily inspirations that motivate his research
Microwave Response of Ceramic MgB2 Samples
No full textThe microwave response of ceramic MgB2 has been investigated as a function of temperature and external magnetic field by two different techniques: microwave surface impedance and second-harmonic emission measurements. The measurements of the surface resistance have shown that microwave losses in MgB2 are strongly affected by the magnetic field in the whole range of temperatures below Tc, even for relatively low field values. The results have been accounted for in the framework of the Coffey and Clem model hypothesizing that in different temperature ranges the microwave current induces fluxons to move in different regimes. In particular, the results at temperatures close to Tc have been quantitatively justified by assuming that fluxons move in the flux-flow regime and taking into account the anisotropy of the upper critical field. At low temperatures, the field dependence of the surface resistance follows the law expected in the pinning limit; however, an unusually enhanced field variation has been detected, which could be due to the peculiar fluxon structure of MgB2, related to the presence of the two gaps. The measurements of the second-harmonic signals have highlighted several mechanisms responsible for the nonlinear response. At low magnetic fields and low temperatures, the nonlinear response is due to processes involving weak links. At temperatures close to Tc, a further contribution to the harmonic emission is present; it arises from the modulation of the order parameter by the microwave field and gives rise to a peak in the temperature dependence of the harmonic-signal intensity
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