42,027 research outputs found
Dual luminescence in solid Cui(piperazine): Hypothesis of an emissive 1-D delocalized excited state
No full textSolid [CuI(piperazine)0.5]∞, characterized by a structure with an infinite double chain of CuI, presents an unexpected dual luminescence. The short copper-copper distances allow the existence of both cluster-centered and 1-D delocalized electronic transitions, as emerged from theoretical calculations. Beyond the more common cluster-centered emission a higher energy band, which differs in lifetime and in temperature dependence, is observed
CUI HU’S MURAL POEM AND ITS RESONANCE IN THE STORY OF “RENMIAN TAOHUA”: A DIALOGIC ANALYSIS
No full textThis thesis studies the poetry-story relationship with an analysis of Cui Hu’s崔護 poem and its resonance in the story of “renmian taohua” 人面桃花 (Beauty and Peach Blossoms). More specifically, I discuss how a Tang Dynasty poem inspired the formation of “renmian taohua” as a literary trope while various forms of adaptation of Cui Hu’s romance shaped the cultural implications of it from late Tang Dynasty to the present. First appearing in Benshi shi (Storied Poems) 本事詩, a late Tang anthology of anecdotes edited by Meng Qi 孟棨, Cui Hu’s poem was represented in a romantic story, which evolved into different genres across different periods. By tracing the evolution of the romance and particularly focusing on one drama adaptation by the playwright Meng Chengshun 孟稱舜 (1598 – 1684) in late Ming Dynasty, I argue that the interaction between poetry and story narratives contextualized a dialogic context where a “collective memory” of the poem was shaped and represented in the form of a commonly used literary trope. Drawing upon Bakhtin’s notion of dialogism, I follow two threads in this study: one is the phrase “renmian taohua” as a multi-cultural discourse of romance and women; the other is the significance of a poetic genre that was popularized in the Ming-Qing period, which I define as “embedded poems” in this essay
Native p-type transparent conductive CuI via intrinsic defects
No full textThe ability of CuI to be doped p-type via the introduction of native defects has been investigated using first-principles pseudopotential calculations based on density functional theory. The Cu vacancy has a lower formation energy than any of the other native defects, which include I vacancy (V(I)), Cu interstitial (Cu(i)), I interstitial (I(i)), Cu antisite (Cu(I)), and I antisite (I(Cu)). Combined with its shallow acceptor level, it offers sufficient hole concentrations in CuI. The natural band alignments as compared to zinc-blende ZnS, ZnSe, and ZnTe have also been calculated in order to further identify the p-type dopability of CuI. It is found that CuI has a relatively high valence band maximum and conduction band minimum, which also makes it easy to dope CuI p-type in terms of the doping limit rule. In addition, the small effective mass of the light hole-about 0.303m(0)-can provide high mobility and p-type conductivity in CuI. All of these results make CuI an ideal candidate for native p-type materials (C) 2011 American Institute of Physics. [doi:10.1063/1.3633220
Dual luminescence in solid CuI(piperazine): hypothesis of an emissive 1-D delocalized excited state
No full textSolid [CuI(piperazine)0.5][infinity], characterized by a structure with an infinite double chain of CuI, presents an unexpected dual luminescence. The short copper-copper distances allow the existence of both cluster-centered and 1-D delocalized electronic transitions, as emerged from theoretical calculations. Beyond the more common cluster-centered emission a higher energy band, which differs in lifetime and in temperature dependence, is observed
Discovery of a novel site of opioid action at the innate immune pattern-recognition receptor TLR4 and its role in addiction
No full textAlso cited as: Neuroimmune signaling in drug actions and addictions, 2014 / C. Cui, D. Shurtleff, R. Adron Harris (eds.), Ch.6 pp. 129–163Abstract not availableJonathan Henry W. Jacobsen, Linda R. Watkins, Mark R. Hutchinso
Semileptonic decays of mesons
No full textA symmetry-preserving continuum approach to meson bound-states in quantum
field theory, employed elsewhere to describe numerous - and -meson
electroweak processes, is used to analyse leptonic and semileptonic decays of
mesons. Each semileptonic transition is conventionally characterised
by the value of the dominant form factor at and the following results are
obtained herein: ; ; and . Working with the computed
-dependence of these form factors and standard averaged values for
, , one arrives at the following predictions for the
associated branching fractions: ; ; and %. Alternatively,
using the calculated -dependence, agreement with contemporary empirical
results for these branching fractions requires ,
. With all transition form factors in hand, the
nature of SU-flavour symmetry-breaking in this array of processes can be
analysed; and just as in the - sector, the magnitude of such effects is
found to be determined by the scales associated with emergent mass generation
in the Standard Model, not those originating with the Higgs mechanism
Tubifex conicus He, Wang & Cui 2012
No full textTubifex conicus He, Wang & Cui, 2012 (Figs 7–8) Tubifex conicus He, Wang & Cui, 2012: 160 –162, Fig. 1. New material. IHB XZ20150602 a–e, 5 mature specimens, whole-mounted in Canada balsam, from Gyaring Co, preserved in IHB, CAS. Gyaring Co (30°58' 43″N, 88°28′04″E), a lake located in northern Tibet of China, ca. 4,648–4,659 m asl. Water depth 11–37 m, water temperature 6.3–8.9°C, pH 6.3–8.9, dissolved oxygen 7.3–7.7 mg / L, conductivity 323–329 µs/cm. Collected by Yongde Cui and Baoqiang Wang on 2 June 2015. Description. Length 6.1–11.6 mm, width at genital segments X–XI 0.28–0.42 mm. Segments 38–65. Prostomium obtuse. Clitellum inconspicuous. No coelomocytes. Dorsal chaetae (0) 1 hair and 1–4 bifids per bundle. Hairs serrate, posteriorly generally absent (Fig. 7A, B). Dorsal bifids pectinate, upper and lower tooth subequal, with 2–3 fine intermediate teeth (Fig. 7A). Ventral chaetae bifid, 3–4 per bundle anteriorly, 2 per bundle posteriorly, upper tooth slightly longer than lower, with (0) 1–2 fine intermediate teeth (Fig. 7C, D). Ventral chaetae in X present, unmodified. Ventral chaetae in XI absent. Male pores paired in line with ventral chaetae, middle to posterior of XI. Chloragogen cells from VI onwards. Male genitalia paired in X–XI. Sperm funnel cup-shaped, 20 µm long, 40 µm wide (Fig. 8A,B: sf). Vas deferens 400–560 µm long, 12–15 µm wide, nearly 3–4 times as long as atrium, ciliated throughout and entering atrium apically (Fig. 8A, B: vd). Atrium spindle-shaped, 120–160 µm long, maximally 32–40 µm wide (Fig. 8A, B: at). Ejaculatory duct present. Prostate gland solid, 80–84 µm long, 60–64 µm wide, attached to ental portion of atrium (Fig. 8A, B: pr). Penis inconspicuous, surrounded by cuticular, symmetrical and funnel-shaped penial sheath. Penial sheath 36–40 µm long, 48–56 µm wide at ental end (Fig. 8A, B, C: ps). Testes paired in X, immediately behind septum 9/10. Ovaries paired in XI, immediately behind septum 10/11. Spermathecae absent. Remarks. The main difference of our redescription from T. conicus as originally described (He et al. 2012) is the absence of spermathecae. However, after our reinvestigation of the type series (holotype and paratypes), we are sure that the testes of T. conicus were mistaken for spermathecae in the original description. Further slight differences between the descriptions concern thickness of atrial epithelium (thicker in the redescription) and penial sheaths (thicker in the original description). They may relate to the stage of maturity or to different modes of interpretation of observations. The size and shape of atria in the original observation and this research are about the same. Penial sheaths appear to have a thick cuticle laterally in the holotype, but when comparing type series and our material, we found no significant differences in penial sheath thickness. Distribution and habitat. Known from Yamdrok Yumco (Lake Yamzho Yumco), Gyaring Co, Chargut Co, Uruni Co, Chikui Co, Amdo Tsonak Co, Tibet, China. All these lakes are located at above 4,000 m asl in Tibet. Gyaring Co, the locality of present redescribed materials, is about 300 km from the holotype locality of T. conicus, Yamdrok Yumco. Freshwater and brackish water.Published as part of Cui, Yongde, 2017, Four species of Tubifex Lamarck (Annelida: Oligochaeta: Naididae) from Tibet, China, pp. 366-378 in Zootaxa 4320 (2) on pages 371-372, DOI: 10.11646/zootaxa.4320.2.10, http://zenodo.org/record/89195
First report of fossil “keratose” demosponges in Phanerozoic carbonates: preservation and 3-D reconstruction
No full textFossil record of Phanerozoic non-spicular sponges, beside of being important with respect to the lineage evolution per se, could provide valuable references for the investigation of Precambrian ancestral animal fossils. However, although modern phylogenomic studies resolve non-spicular demosponges as the sister group of the remaining spiculate demosponges, the fossil record of the former is extremely sparse or unexplored compared to that of the latter; the Middle Cambrian Vauxiidae Walcott 1920, is the only confirmed fossil taxon of non-spicular demosponges. Here, we describe carbonate materials from Devonian (Upper Givetian to Lower Frasnian) bioherms of northern France and Triassic (Anisian) microbialites of Poland that most likely represent fossil remnants of keratose demosponges. These putative fossils of keratose demosponges are preserved as automicritic clumps. They are morphologically distinguishable from microbial fabrics but similar to other spiculate sponge fossils, except that the skeletal elements consist of fibrous networks instead of assembled spicules. Consistent with the immunological behavior of sponges, these fibrous skeletons often form a rim at the edge of the automicritic aggregate, separating the inner part of the aggregate from foreign objects. To confirm the architecture of these fibrous networks, two fossil specimens and a modern thorectid sponge for comparison were processed for three-dimensional (3-D) reconstruction using serial grinding tomography. The resulting fossil reconstructions are three-dimensionally anastomosing, like modern keratose demosponges, but their irregular and nonhierarchical meshes indicate a likely verongid affinity, although a precise taxonomic conclusion cannot be made based on the skeletal architecture alone. This study is a preliminary effort, but an important start to identify fossil non-spicular demosponges in carbonates and to re-evaluate their fossilization potential
Ilyodrilus mesoprostatus Cui & Wang, 2009, n. sp.
No full textIlyodrilus mesoprostatus n. sp. Holotype: IHB YAN 20030405 n, whole-mounted specimen. Type locality: Xingyun Lake (24 ° 18 '01΄ N, 102 ° 47 ' 58 ΄ E), eastern Yunnan Province, China; depth 5.0 m, bottom temperature 16.1 °C, dissolved oxygen at bottom 7.6 mg /L, total nitrogen in water 2.960 mg /L, total phosphorus in water 0.129 mg /L, fine silt; 7 Apr 2003, coll. Y. Cui. Etymology: “ meso ” and “ prostatus ” are Latin for “middle” and “prostate”, respectively. The specific name refers to the prostate glands attaching to the middle part of the atria. Description: Specimen incomplete, length> 4.4 mm, diameter at XI about 0.7 mm, segments> 22. Clitellum inconspicuous. Dorsal chaetae 2–5 hairs and 2–4 bifids per bundle, hairs slender and smooth, 250–350 µm long, 2.0 µm thick basally; bifids (Fig. 4 C) 100–125 µm long, 2.5 –3.0 µm thick, with upper prong longer and thicker than lower. Dorsal chaetae absent in XI. Ventral chaetae (Fig. 4 A–B) bifid, 2–4 per bundle, 100–120 µm long, 2.5 –3.0 µm thick, with upper prong longer and thinner than lower. Spermathecal chaetae unmodified in X. Penial chaetae absent in XI. Male pores paired in line with ventral chaetae in mid-XI. Spermathecal pores paired in line with ventral chaetae in mid-X. Pharyngeal glands in II–III. Chloragogen cells from VI onwards. No coelomocytes. Male genitalia (Fig. 4 D) paired. Vas deferens (Fig. 4 D, vd) short and broad, 240–360 µm long, 36–46 µm wide, entering atrium apically. Atrial ampulla (Fig. 4 D, aa) somewhat spindle-shaped, 280–320 µm long, 58–108 µm wide. Prostate gland (Fig. 4 D, pr) large, attached to middle portion of atrium by short stalk. Atrial duct (Fig. 4 D, ed) curved, about 54 µm long, 25–36 µm wide. Soft part of penis (Fig. 4 D, pe) cylindrical, about 32 µm long, 20 µm diameter, enclosed in copulatory sac; penis surrounded by thin cuticularized, truncated-cone shaped sheath (Fig. 4 D, ps; Fig. 4 E), 116 µm long, 40–80 µm wide, one side of the ectal opening (Fig. 4 E, eo) curved upwards. Copulatory sac (Fig. 4 D, cs) 64 µm long, 40–50 µm wide. Spermathecal ampullae (Fig. 4 D, sa) oval to round, 105–125 µm in diameter, with sperm masses (Fig. 4 D, sm) in lumina, ducts (Fig. 4 D, sd) 160–250 µm long, 35–58 µm wide. Distribution and habitat: Known only from type locality, Yunnan Province, China. Freshwater lake, 5.0 m depth, water temperature 16 ºC, fine silt. Remarks: The genus Ilyodrilus consists of the type species, I. perrieri Eisen, 1879, together with I. templetoni (Southern, 1909) and the dubious entities I. frantzi Brinkhurst, 1965 and I. fragilis Eisen, 1879. The principal characteristics and the distribution of congeners are shown in Table 3. Ilyodrilus mesoprostatus n. sp. is distinguishable from congeners mainly in the respect that attachments of prostate glands are situated at middle part of the atria, while those of previously described species are all situated near the ental part of the atria (Table 3). The penial sheaths of different species are dissimilar. Despite the undeveloped type specimens, I. perrieri from California has more or less tubular, cuticular penial sheaths (Holmquist 1985). I. fragilis has thin sheaths (Eisen 1879; Brinkhurst 1978). The cosmopolitan I. templetoni has long conical tapering distally sheath with irregular opening (Brinkhurst 1965; Hrabĕ 1966) and I. frantzi has thin, truncated cone-shaped cuticular sheath (Brinkhurst 1965). The new species has truncated-cone shaped sheath, with ectal opening curved upwards at one side (Table 3). The presence of spermatozeugmata is regarded a diagnostic character of the genus Ilyodrilus (Brinkhurst & Jamison 1971). Although spermatozeugmata are absent in the present new species, it was assigned to this genus according to the structure of male genitalia. Spermatozeugmata are in fact not always present in Ilyodrilus. For instance, they were not mentioned in previous descriptions of I. perrieri and I. fragilis (Eisen, 1879; Holmquist 1985; Brinkhurst, 1965; Brinkhurst & Jamison 1971). Some specimens of I. templetoni have been described without spermathecae at all (Brinkhurst & Jamison 1971, Wang 2002), while for I. frantzi, the presence of spermatozeugmata was confirmed (Holmquist 1985). In the new species, I. mesoprostatus, the sperm were massed. So, the genus Ilyodrilus Eisen, 1879, needs a revision in the future.Published as part of Cui, Yongde & Wang, Hongzhu, 2009, Three new species of Tubificinae, Oligochaeta, from two plateau lakes in Southwest China, pp. 45-54 in Zootaxa 2143 on pages 51-53, DOI: 10.5281/zenodo.18861
Optical particle detection integrated in a dielectrophoretic lab-on-a-chip
No full textThe design and fabrication of a dielectrophoretic "lab-on-a-chip" device for bioparticle processing and counting is presented. The device consists of a multi-layer travelling wave dielectrophoretic electrode array for manipulating particles and/or fluids, micro channels for delivering samples, and optical fibres for counting particles and/or measuring their velocities. Single particles were detected optically using either light scattering or fluorescence emission. The technology described in this work is potentially applicable to a range of particulate diagnostic systems
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