1,223 research outputs found
Photograph, Goro Tsuchida, Portrait
No full textBlack and white photograph of man in foreground, cliff landscape, Jeep, and three men in background. Inscription on back reads "T/Sgt Goro Tsuchida Chicago, ILL, Co M, 442, Ruby Dobana, Stockton."Collected by Ruby Dobana, wife of Fred Dobana. They got married while incarcerated at Rohwer. Fred Dobana enlisted with the U.S. Army in 1942 and was assigned to the 442nd Regimental Combat Team. Source: https://www.ancestry.com
Munidopsis laticorpus Cubelio, Tsuchida & Watanabe 2008
No full textMunidopsis laticorpus Cubelio, Tsuchida & Watanabe, 2008 Munidopsis laticorpus Cubelio et al., 2008: 112, fig. 2 (Kairei Field, Indian Ocean, 2422–2435 m). Type data: holotype, female, NSMT-Cr 16876. Type locality: Kairei Field, Indian Ocean, 24º19.24´S, 70º02.40´E, 2422 m.Published as part of Baba, Keiji, Macpherson, Enrique, Poore, Gary C. B., Ahyong, Shane T., Bermudez, Adriana, Cabezas, Patricia, Lin, Chia-Wei, Nizinski, Martha, Rodrigues, Celso & Schnabel, Kareen E., 2008, Catalogue of squat lobsters of the world (Crustacea: Decapoda: Anomura-families Chirostylidae, Galatheidae and Kiwaidae), pp. 1-220 in Zootaxa 1905 (1) on page 146, DOI: 10.11646/zootaxa.1905.1.1, http://zenodo.org/record/513458
Munidopsis kermadec Cubelio, Tsuchida & Watanabe 2007
No full text<i>Munidopsis kermadec</i> Cubelio, Tsuchida & Watanabe, 2007 <p> <i>Munidopsis kermadec</i> Cubelio <i>et al.</i>, 2007b: 514, fig. 2 (Brothers Seamount, 1649 m).</p> <p>Type data: holotype, female, NIWA, 25862.</p> <p>Type locality: Brothers Seamount, 34º51.756´S, 179º03.476´E, 1649 m.</p>Published as part of <i>Baba, Keiji, Macpherson, Enrique, Poore, Gary C. B., Ahyong, Shane T., Bermudez, Adriana, Cabezas, Patricia, Lin, Chia-Wei, Nizinski, Martha, Rodrigues, Celso & Schnabel, Kareen E., 2008, Catalogue of squat lobsters of the world (Crustacea: Decapoda: Anomura-families Chirostylidae, Galatheidae and Kiwaidae), pp. 1-220 in Zootaxa 1905 (1)</i> on page 146, DOI: 10.11646/zootaxa.1905.1.1, <a href="http://zenodo.org/record/5134587">http://zenodo.org/record/5134587</a>
Plesionika unicolor Komai & Tsuchida, 2014, n. sp.
No full textPlesionika unicolor n. sp. (Fig. 2–5) Material examined. Holotype: RV “Natsushima”, NT 10-13 cruise, ROV “Hyper-Dolphin”, dive # 1165, Northeast Nikko Seamount, 23 °06.787’N, 142 ° 21.936 ’E, 564 m, 31 July 2010, slurp gun, ovigerous female (pcl 13.0 mm), NSMT-Cr 22719. Non-type: same dive, collecting point not specified, 1 juvenile (pcl 5.8 mm), JAMSTEC 1100023729. Description. Holotype. Body (Fig. 2) moderately stout for genus; integument firm. Rostrum (Fig. 3 A, B) gently upturned, distinctly overreaching antennal scale, slightly shorter than carapace (approximately 0.9 of carapace length); dorsal margin armed with moderately strong 11 teeth (including 8 postrostral), 3 on proximal half of rostrum widely spaced, fixed, but 7 of 8 postrostral series basally articulated; none of dorsal rostral series barbed at tip; 7 basally articulated teeth closely set, decreasing in size posteriorly, posteriormost one located at about 0.4 of carapace length; no subterminal teeth on dorsal rostral margin; ventral margin with widely spaced 6 small teeth decreasing in length distally; lateral surface with sharp carina extending to distal 0.3, merging into orbital margin. Carapace (Figs. 2, 3 A, B) with low but distinct postrostral crest extending to midlength, with peak at posteriormost dorsal spine; dorsal surface with scattered microscopic setae and tegmental scales; orbital margin nearly vertical in lateral view, with row of stiff setae; suborbital lobe not clearly delineated; antennal tooth broadly triangular, sharply pointed; branchiostegal tooth also small, not exceeding antennal tooth. Pleon (Fig. 2) rounded, unarmed dorsally. First and second pleomeres each with distinct transverse groove concealed by row of setae on dorsal surface (Fig. 3 C). Third pleomere with slightly produced posterodorsal margin. First to third pleura rounded, fourth and fifth each with small posteroventral tooth. Six pleomere 1.7 times as long as fifth, 1.8 times longer than high, with small posteroventral tooth and acutely pointed posterolateral process. Telson damaged. Eye (Fig. 3 A, B) large, subspherical; corneal width about 0.2 of carapace length; ocellus distinct, not constricted at base. Eyestalk short, cup-shaped. Antennular peduncle (Fig. 3 A, B) slightly overreaching midlength of antennal scale. First segment longer than distal 2 segments combined; dorsodistal margin elevated, with several stiff setae; ventromesial ridge with tiny tooth; stylocerite acuminate, reaching distal margin of first segment, bearing distinct protuberance proximolaterally. Second segment with 4 or 5 minute spinules on dorsodistal margin. Outer flagellum exceeding 3 times as long as carapace, aesthetasc-bearing portion about 0.8 of carapace length. Antennal peduncle (Fig. 3 B, D) with stout basicerite bearing moderately strong ventrolateral tooth. Carpocerite reaching midlength of antennal scale. Antennal scale about 0.6 times as long as carapace, 3.8 times as long as wide; lateral margin slightly convex; distolateral tooth just reaching roundly truncate distal lamella. Third maxilliped (Fig. 4 A) slender, overreaching antennal scale by half length of penultimate segment (carpus). Ultimate segment subequal in length to penultimate segment, both with scattered long setae on dorsal, lateral and ventral surfaces, and with slender terminal spine. Antepenultimate segment subequal in length to distal two segments combined. Coxa with rounded lateral pate bearing strap-like epipod. Exopod reaching beyond midlength of antepenultimate segment. Strap-like epipods on first to fourth pereopod and corresponding setobranchs on second and third pereopods; epipod on fourth pereopod smaller than others, no corresponding setobranch on fourth pereopod. First pereopod (Fig. 4 B) slender, elongate, microscopically chelate, overreaching antennal scale by half length of carpus. Propodus tapering distally, 0.6 times as long as carpus, bearing grooming setae on proximal 0.3 of mesial surface ventrally. Carpus with scattered long setae. Merus-ischium combined slightly shorter than propodus-carpus combined; ischium with row of 7 minute spinules on mesial surface adjacent to ventral margin (Fig. 3 F). Second pereopods (Fig. 4 C, D) subequal in length, overreaching antennal scale by length of chela. Chela slightly less than 0.2 length of carpus; dactylus subequal in length to palm; carpus divided into 16 (right) or 19 (left) articles, distalmost article longest and bearing 2 prominent tufts of setae. Merus slightly shorter than ischium, without annulation; ischium with row of curved stiff setae in proximal 0.6. Third to fifth pereopods elongate, slender, similar in shape, bearing sparse long setae on each segment, fifth slightly shorter than third and fourth. Third pereopod (Fig. 4 E) overreaching antennal scale by 0.1 length of merus; dactylus (Fig. 3 G, H) less than 0.1 length of propodus, terminating in clearly demarcated unguis, bearing 2 accessory spinules on distal half of flexor margin, ultimate accessory spinule less than half length of unguis; propodus (Fig. 3 H) 0.8 times as long as carpus, with spinules arranged in 2 irregular rows on flexor margin; carpus with 7 small spines on lateral surface adjacent to flexor margin; merus subequal in length to propodus-carpus combined, about 1.4 times as long as carapace, armed with 12 lateral spines and 6 ventromesial spines; ischium with 2 ventral spines. Fourth pereopod (Fig. 4 F) just reaching antennal scale by tip of merus; carpus with 2 small spines; merus about 1.4 times as long as carapace, shorter than propodus-carpus combined, armed with 12 lateral spines and 9 ventromesial spines; ischium with 1 ventral spine. Fifth pereopod (Fig. 4 G) reaching midlength of antennal scale by tip of merus; merus 1.1 times as long as carapace, with 10 lateral spines; ischium unarmed ventrally. Pleopods and uropod without distinctive features. Eggs small, about 0.4 x 0.6 mm. Non-type (juvenile). Generally similar to holotype. Rostrum just reaching distal margin of antennal scale, 0.7 of carapace length; dorsal margin armed with 12 teeth, including 4 on rostrum proper and 8 postrostral (of them posterior 7 teeth basally articulated); ventral margin with 5 teeth. Telson (Fig. 3 I) slightly falling short of posterior margin of uropodal rami, terminating in acute posteromedian projection, with 4 pairs of dorsolateral spines; posteromedian projection armed with 3 pairs of spines (second pair longest). Antennular peduncle with stylocerite reaching only midlength of first segment. Epipods on first and second pereopods normally developed, that on third pereopod rudimentary, no epipod on fourth pereopod. Carpi of second pereopods each divided in 17 articles. Meri of third to fifth pereopod with 9, 8, 8 lateral spines and 8, 7, 1 ventral or ventromesial spines, respectively. Coloration. Body and appendages generally orange. Cornea brown, with reflective pigment. Propodi and carpi of posterior 3 pairs of pereopods whitish. See Fig. 5. Distribution. Known only from the type locality, Northeast Nikko Seamount, 564 m. Remarks. Plesionika Spence Bate, 1888 is the most species-rich genus in the caridean family Pandalidae, currently represented by about 90 species worldwide (De Grave & Fransen 2011; Cardoso 2011; Li & Chan, 2013). Identities of several species are still confusing in spite of recent revisionary studies (e.g., Chan & Crosnier 1991; 1997; Chan 2004; Fransen 2006). The present new species appears closest to P. picta Chan & Crosnier, 1997, presently known only from French Polynesia. Shared diagnostic characters include: rostrum relatively short, with proportional ratio against carapace length included within range of 0.8 –1.0; most of postrostral teeth basally articulated; orbital margin nearly vertical posteriorly in lateral view, with a row of stiff setae; antennal tooth of carapace broadly triangular, not spiniform; telson with 4 pairs of dorsolateral spines; second pereopods subequal in length; dactyli of the third to fifth pereopods about 0.1 times as long as propodi. Morphologically, P. unicolor n. sp. can be distinguished from P. picta by some minor or subtle differences. The postrostral crest appears to be more distinct in P. unicolor n. sp. than in P. picta (cf. Fig. 3 B and Chan & Crosnier 2004: Fig. 20 a, e). Basally articulated teeth on the postrostral crest are distinctly longer in P. unicolor n. sp. (Fig. 3 B) than in P. picta (cf. Chan & Crosnier 2004: Fig. 20 a, e). The antennal tooth of the carapace is acuminate in P. unicolor n. sp., rather than blunt or at most subacute in P. picta (cf. Chan & Crosnier 2004: Fig. 20 a, e). The ultimate accessory spinules on the third pereopod dactylus is distinctly less than half length of the unguis in P. unicolor n. sp. (Fig. 3 G), whereas it is only shorter than the unguis in P. p i c t a, making the dactylus distally biunguiculate (Chan & Crosnier 2004: Fig. 20 d). In addition, the epipod on the fourth pereopod is prominent on either side in the adult holotype of P. unicolor n. sp., whereas in P. picta, the fourth pereopod is normally devoid of epipod (Chan & Crosnier 1997). As noted below, however, variation will discount the diagnostic significance of this character, but still may be useful. The color in life is quite different between the two species. As shown by previous studies, coloration is a very useful character in distinguishing species in Plesionika (e.g., Chan & Crosnier 1991; 1997; Chan 2004). In P. unicolor n. sp., the body is entirely orange without conspicuous markings. In contrast, in P. picta, the carapace is generally red with a whitish posterior margin; the abdomen is alternated with red and white bands. It is remarkable that the development of pereopodal epipods is different between the adult and juvenile in P. unicolor n. sp. As described above, the adult holotype bears epipods on the anterior four pereopods. On the other hand, the juvenile has normally developed epipods only on the first and second pereopods; epipod on the third pereopod is rudimentary; and no epipod is present on the fourth pereopod. It is likely that epipods on the third and fourth pereopods develop with growth. Intraspecific variation in the development of the epipod on the fourth pereopod is also known in the closely related P. picta (cf. Chan & Crosnier 1997). Etymology. Named after the uniformly orange color of the body. Used as a noun in apposition.Published as part of Komai, Tomoyuki & Tsuchida, Shinji, 2014, Deep-Sea decapod crustaceans (Caridea, Polychelida, Anomura and Brachyura) collected from the Nikko Seamounts, Mariana Arc, using a remotely operated vehicle " Hyper-Dolphin ", pp. 279-316 in Zootaxa 3764 (3) on pages 280-286, DOI: 10.11646/zootaxa.3764.3.3, http://zenodo.org/record/25258
The behaviour of layered clays within a framework for the structure-related behaviour of clays
No full textThe paper presents results of a detailed study of the behaviour of natural normally consolidated clays from the archaeological site of Sibari, Southern Italy. These are examined within a new general framework for the behaviour of clays, features of which are confirmed by the Sibari data. The framework includes both natural and reconstituted clays, based on the premise that basic mechanisms of deformation are common to clays of different structure. Differences in behaviour between different claps are shown to result from differences in nature and structure, while sensitivity is demonstrated to be the parameter which quantifies the effects of structure. The Sibari clays are shown to have a layered structure which causes their differences in behaviour with respect to the same soils when reconstituted. Normalisation for sensitivity is shown to eliminate these differences. Based on the understanding of the compression behaviour of the soils, the history of the surface settlement has been reconstructed
Block in the expression of differentiation markers of rat thyroid epithelial cells by transformation with Kirsten murine sarcoma virus.
No full textWell-differentiated epithelial cells, derived from primary cultures of normal rat thyroid glands (T-79 cells), as well as a cloned cell line also derived from normal rat thyroid glands (FRT-L cells) were infected with Kirsten murine sarcoma virus carrying outer coat of the helper Kirsten murine leukemia virus. Infected T-79 and FRT-L cells changed morphologically and began to proliferate rapidly, suggesting malignant transformation by the virus. Both cell lines can support the replication of both transformation-competent and transformation-incompetent viruses such as murine or rat leukemia viruses. Infected T-79 and FRT-L cells had a high colony-forming efficiency (68 and 64%, respectively) when grown in agar and formed tumors when transplanted s.c. into syngeneic rats. These tumors morphologically resemble undifferentiated adenocarcinomas, thus showing that Kirsten sarcoma virus carrying the outer coat of the helper Kirsten murine leukemia virus is able to transform differentiated epithelial cells. Transformed T-79 and FRT-L cells, in contrast to uninfected cells, neither secrete thyroglobulin concentrate iodide, two biochemical markers of differentiated thyroid function. Thus, expression of the differentiated phenotype is blocked as a consequence of cell transformation. The system described may be useful in studying epithelial cell carcinogenesis in terms of regulated expression of differentiated functions
Fabrication of SPS compacts from NbC-NbB2 powder mixtures synthesized by the MA-SHS in air process
No full textWhen the powder mixture of Nb/B/C = 2/2/1 in molar ratio was mechanically activated (MA) by ball milling for 105 min and then exposed to air, it self-ignited spontaneously and the self-propagating high-temperature synthesis (SHS) was induced. The powder mixture of NbC and NbB2 was obtained by this MA–SHS in air process and then sintered by spark plasma sintering (SPS) at a temperature as low as 1800 °C. The sintered NbC/NbB2 composite compact showed the fine, homogeneous microstructure consisting of the a few μm-sized grains and the Vickers hardness of 19.8 GPa, which was higher than 14.3 and 16.6 GPa for the NbC/NbB2 composite compacts sintered from the powder mixture of Nb/B/C = 2/2/1 without MA–SHS and from the commercial powder mixture of NbC/NbB2 = 1/1
High-Resolution X-ray Topography of Dislocations in 4H-SiC Epilayers
No full textAbstractSilicon carbide (SiC) substrates and epilayers contain many crystal defects, such as micropipes, screw dislocations, threading edge dislocations (TEDs), basal plane dislocations (BPDs) and stacking faults. To investigate these defects, synchrotron radiation topography is frequently carried out. When the monochromatic synchrotron X-ray topography is taken by the grazing-incidence reflection geometry using 11-28 reflection, screw dislocations, TEDs and BPDs are simultaneously seen and shown as different topographic images [1]. Many studies of dislocations were reported using 11-28 reflections in 4H-SiC [1,2]. Topographic images of the dislocations have been analyzed by the ray-tracing method of computer simulation [3]. However, experimental images of dislocations were not fully matched to the fine structure of simulation images, because of a lack of resolution in recording media: conventional films and nuclear emulsion plates [3]. This time, we report obtaining high-resolution topographic images using a new recording medium, and compare results between the experiment and the computer simulation. Synchrotron topography in 11-28 reflection was carried out at SPring8 applying holography films as high-resolution recording media. The TED images are distinguished as four types, which have ribbon-like features with different rotating angles, through the use of the films. The four different TED images agree well with the computer simulated images which have been reported by Vetter et.al. taking into account of the different Burgers vector directions [3]. By comparing the three topographic images taken at g=-12-18, 11-28 and 2-1-18, we confirmed experimentally that the four types of TED images originated from the difference of Burgers vector directions. We also investigated high-resolution topographic images of elementary screw dislocations, micropipes, and BPDs in 4H-SiC epilayers. The experimental image of screw dislocation fairly matched with simulated image. The fine features in the experimental topographic images of micropipes and BPDs are also compared with the simulated images in detail. [1] T. Ohno, H. Yamaguchi, S. Kuroda, K. Kojima, T. Suzuki, K. Arai: J. cryst. Growth. Vol. 260 (2004) 209. [2] H. Tsuchida, T. Miyanagi, I. Kamata, T. Nakamura, R. Ishii, K. Nakayama and Y.Sugawara: Jpn. J. Appl. Phys. Vol. 25, (2005), L806-808. [3] W. Vetter, H. Tsuchida, I. Kamata, M. Dudley: J. Appl. Cryst. Vol. 38, (2005), 442-447.</jats:p
Ly49 and C-type lectin receptors on dendritic cells regulate T-cell differentiation as co-stimulatory molecules
No full textThe C-type lectin receptors (CLRs) expressed on dendritic cells (DCs) participate in T-cell polarization by recognizing pathogen-associated molecular patterns and activating signaling pathways for cytokine production. In addition, some CLRs expressed on DCs function as co-stimulatory molecules via recognition of endogenous ligands on T cells and regulate proliferation and/or differentiation of T cells. We recently showed that killer cell lectin-like receptor Ly49s3 is expressed in rat thymic DCs and recognizes MHC class I molecules on T cells, for differentiation into naturally occurring regulatory T cells (nTregs). Upon binding to MHC class I molecules on T cells, Ly49s3 seems to stimulate signal transduction pathway(s) leading to up-regulation of the MHC class II genes and then functions as a co-stimulatory molecule. The signaling pathway(s) is supposed to involve Dap12, Syk/Zap70, Lat, Plc-gamma, PKC, PU.1 and C2ta proteins to attain MHC class II expression. Other than Ly49s3, Ly49Q and Ly49B have been shown to be expressed in myeloid cells including DCs and macrophages, raising the possibility that they may be involved in the regulation of T-cell differentiation through recognition of MHC class I molecules on T cells. In humans, immunoglobulin (Ig)-like receptors binding to MHC class I molecules take the place of Ly49 receptors. Among them, expression of the KIR2DL4 gene has been reported to be induced in antigen-presenting cells, although its biological significance is obscure, and immunoglobulin-like transcript 4 (ILT4) expressed in DCs has been shown to down-regulate expression of MHC class II molecules on the same cells, upon binding to MHC class I molecules. They may also be involved in regulation of T-cell differentiation. Some other CLRs are expressed on DCs and possibly function as co-stimulatory molecules. For example, dectin-1, dectin-2 and Dcal-1 have been shown to promote T-cell proliferation, Treg differentiation and IL-4 production of T cells, respectively, through binding to unidentified ligands on T cells. DC-Sign, which recognizes ICAM3 on T cells, is also suggested to be involved in T-cell differentiation. Further investigation of the functional roles of CLRs on DCs will provide insight into the regulatory mechanisms of T-cell differentiation, essential processes for regulating immune responses
Trapezionida Macpherson & Baba
No full textGenus <i>Trapezionida</i> Macpherson & Baba, in Machordom, Ahyong, Andreakis, Baba, Buckley, Garcia-Jimenez, McCallum, Rodriguez-Flores & Macpherson, 2022 <p> <b>Remarks.</b> <i>Trapezionida</i> is presently represented by 157 species (Machordom <i>et al</i>. 2022; Tiwari <i>et al</i>. 2022a, 2023; WoRMS 2023b), all of them are distributed in the Indo-West Pacific. From Japanese waters, the following 30 species assigned to the genus have been recorded (Baba <i>et al</i>. 2008; Komai 2011, 2012; Komai & Higashiji 2016): <i>T. agave</i> (Macpherson & Baba, 1993), <i>T. caesura</i> (Macpherson & Baba, 1993), <i>T. consobrina</i> (Komai, 2012), <i>T. disiunctus</i> (Komai, 2011), <i>T. heteracantha</i> (Ortmann, 1892), <i>T. honshuensis</i> (Benedict, 1902), <i>T. japonica</i> (Stimpson, 1858), <i>T. kawamotoi</i> (Osawa & Okuno, 2002), <i>T. koyo</i> (Komai, 2011), <i>T. leptosyne</i> (Macpherson, 1994), <i>T. longinquus</i> (Komai, 2011), <i>T. maculata</i> (Komai, 2012), <i>T. megalophthalma</i> (Komai, 2012), <i>T. multilineata</i> (Komai, 2012), <i>T. munin</i> (Komai, 2011), <i>T. nesaea</i> (Macpherson & Baba, 1993), <i>T. olivarae</i> (Macpherson, 1994), <i>T. ommata</i> (Macpherson, 2004), <i>T. osawai</i> (Komai, 2012), <i>T. paucistria</i> (Komai, 2012), <i>T. pectinata</i> (Macpherson & Machordom, 2005), <i>T. pherusa</i> (Macpherson & Baba, 1993), <i>T. rufiantennulata</i> (Baba, 1969), <i>T. sagamiensis</i> (Doflein, 1902), <i>T. solitaria</i> (Komai, 2012), <i>T. squamifera</i> (Komai, 2012), <i>T. striola</i> (Macpherson & Baba, 1993), <i>T. trigonocornus</i> (Komai, 2012), <i>T. vicina</i> (Komai, 2012) and <i>T. zebra</i> (Macpherson, 1994). In this study, we report <i>T. psylla</i>, previously known from the Southwest Pacific, as a species new to the Japanese fauna.</p>Published as part of <i>Komai, Tomoyuki, Tsuchida, Shinji & Fujiwara, Yoshihiro, 2023, New record of two species of munidid squat lobster (Decapoda: Anomura) from the North-West Pacific off Japan, pp. 239-254 in Zootaxa 5369 (2)</i> on page 246, DOI: 10.11646/zootaxa.5369.2.4, <a href="http://zenodo.org/record/10152389">http://zenodo.org/record/10152389</a>
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