73,996 research outputs found
Processing of figure and background motion in the visual system of the fly
Full text linkReichardt W, Egelhaaf M, Guo A-K. Processing of figure and background motion in the visual system of the fly. Biological Cybernetics. 1989;61(5):327-345
Measurement of the ratio of branching fractions B(B0→K∗0γ )/B(B0s→φγ ) and the directCP asymmetry inB 0→K∗0γ
Full text linkThe ratio of branching fractions of the radiative B decays B0→K⁎0γ and B0s→ϕγ has been measured using an integrated luminosity of 1.0 fb−1 of pp collision data collected by the LHCb experiment at a centre-of-mass energy of s√=7TeV. The value obtained is
B(B0→K⁎0γ)B(B0s→ϕγ)=1.23±0.06(stat.)±0.04(syst.)±0.10(fs/fd),
where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is associated with the ratio of fragmentation fractions fs/fd. Using the world average value for B(B0→K⁎0γ), the branching fraction B(B0s→ϕγ) is measured to be (3.5±0.4)×10−5.
The direct CP asymmetry in B0→K⁎0γ decays has also been measured with the same data and found to be
ACP(B0→K⁎0γ)=(0.8±1.7(stat.)±0.9(syst.))%.
Both measurements are the most precise to date and are in agreement with the previous experimental results and theoretical expectations
Kinematic Simulation and Structure Analysis of a Morphing Flap
Full text linkThis thesis presents a study on the design and analysis of a morphing flap
structure integrated with actuation mechanism for potential application to large
aircraft. Unlike the conventional rigid flap mounted on the wing trailing edge,
the morphing flap is designed as a unitized structural system integrated with
three primary components: the upper and lower flexible skins reinforced by
stringers, an eccentric beam actuation mechanism (EBAM) with discs fixed on it,
and the connection of the discs with the stringers. Based on the EBAM concept
proposed by Dr Guo in previous research [1], the current study has been
focused on the EBAM design and optimization, kinematic simulation and
structural modelling of the morphing flap.
Although a lot of efforts have been made to develop the morphing flap in
previous research, it is lack of detailed design of the disc-skin linkage and clear
view on the mechanism optimization in relation to the shape requirement. The
main objective of this research is to meet the morphing shape requirements and
calculate the actuation torque for a specified morphing flap. Firstly effort was
made to design and optimize the disc shape and locations in the EBAM for the
best matching of the specified morphing shape with minimum actuation torque
demand. It is found that minimum three discs are required and their locations
have little effect on the actuation torque. Secondly attention was focused on
designs of the disc and a C-linkage with the stringers. To ensure that the C-
linkage works in practice, a twisted stringer flange design was proposed. Thirdly
the actuation mechanism was integrated with the stiffened skin to play the role
of an active rib in the flap structure. Based on the design, FE modelling and
analysis of the morphing flap structure was carried out. The behaviour of the
morphing flap under the internal actuation and external aerodynamic load was
applied for stress analysis and detailed design of the structures. Finally the
kinematics of the integrated morphing flap was simulated by using CATIA to
demonstrate the feasibility and the effectiveness of the improved design
The biclique covering number of grids
No full textWe determine the exact value of the biclique covering number for all grid graphs
N-(3-oxododecanoyl)-homoserine lactone regulates intracellular calcium of MC3T3 osteoblasts
No full textPseudomonas aeruginosa (P. aeruginosa) is associated with periapical periodontitis. The lesions are characterized by a disorder in osteoblast metabolism. Quorum sensing molecular N-(3-oxododecanoyl)-homoserine lactone (AHL) is secreted by P. aeruginosa and governs the expression of numerous virulence factors. AHL can trigger intracellular calcium ([Ca²⁺]i) fluctuations in many host cells. However, it is unclear whether AHL can regulate osteoblast metabolism by affecting [Ca²⁺]i changes or its spatial correlation. We explored AHL-induced apoptosis and differentiation in pre-osteoblastic MC3T3-E1 cells and evaluated [Ca²⁺]i mobilization using several extraction methods. The spatial distribution pattern of [Ca²⁺]i among cells was investigated by Moran's I, an index of spatial autocorrelation. We found that 30 μM and 50 μM AHL triggered opposing osteoblast fates. At 50 μM, AHL inhibited osteoblast differentiation by promoting mitochondrial-dependent apoptosis and negatively regulating osteogenic marker genes, including Runx2, Osterix, bone sialoprotein (Bsp), and osteocalcin (OCN). In contrast, prolonged treatment with 30 μM AHL promoted osteoblast differentiation concomitantly with cell apoptosis. The elevation of [Ca²⁺]i levels in osteoblasts treated with 50 μM AHL was spatially autocorrelated, while no such phenomenon was observed in 30 μM AHL-treated osteoblasts. The blocking of cell-to-cell spatial autocorrelation in the osteoblasts provoked by 50 μM AHL significantly inhibited apoptosis and partially restored differentiation. Our observations suggest that AHL affects the fate of osteoblasts (apoptosis and differentiation) by affecting the spatial correlation of [Ca²⁺]i changes. Thus, AHL acts as a double-edged sword for osteoblast function.
Please cite this article below if using any data from this dataset.
Guo J, Wang Z, Weng Y, Yuan H, Yoshida K, Ikegame M, Uchibe K, Kamioka H, Ochiai K, Okamura H, Qiu L. N-(3-oxododecanoyl)-homoserine lactone regulates osteoblast apoptosis and differentiation by mediating intracellular calcium. Cellular Signalling. 2020 Aug 18:109740. https://doi.org/10.1016/j.cellsig.2020.10974
Kwoniella newhampshirensis K. Sylvester, Q. M. Wang & C. T. Hittinger 2020, sp. nov.
No full text<p> <i>Kwoniella newhampshirensis</i> K. Sylvester, Q.M. Wang & Hittinger, <i>sp. nov.</i> MycoBank MB828749.</p> <p>For description see FEMS Yeast Research 15: 7 (2015).</p> <p> <i>Holotype:</i> NRRL Y-63731 (preserved in a metabolically inactive state).</p> <p> <i>Synonyms</i>: <i>Kwoniella newhampshirensis</i> K. Sylvester <i>et al.</i>, FEMS Yeast Res. 15: 7 (2015), <i>nom. inval.</i>, Art. 40.7 (Shenzhen).</p>Published as part of <i>Li, A. - H., Yuan, F. - X., Groenewald, M., Bensch, K., Yurkov, A. M., Li, K., Han, P. - J., Guo, L. - D., Aime, M. C., Sampaio, J. P., Jindamorakot, S., Turchetti, B., Inacio, J., Fungsin, B., Wang, Q. - M. & Bai, F. - Y., 2020, Diversity and phylogeny of basidiomycetous yeasts from plant leaves and soil: Proposal of two new orders, three new families, eight new genera and one hundred and seven new species, pp. 17-140 in Studies In Mycology 96</i> on page 134, DOI: 10.1016/j.simyco.2020.01.002, <a href="http://zenodo.org/record/10497182">http://zenodo.org/record/10497182</a>
Sphaerocoryne gracilipes X. Guo & R. M. K. Saunders, Taxon 66 (1): 15 2017
No full textSphaerocoryne gracilipes (Benth.) X.Guo & R.M.K.Saunders, Taxon 66(1): 15, 2017 Figs 99, 100; Map 12G ≡ Oxymitra gracilipes Benth., Trans. Linn. Soc. London 23: 471-472, 1862; Cleistopholis gracilipes (Benth.) Engl. & Diels, Engler in Monogr. Afrik. PflanzenFam. 6: 34, 1901; Richella gracilipes (Benth.) R.E.Fr., Engler & Prantl in Nat. Pflanzenfam., ed. 2, 17 a(2): 139, 1959; Friesodielsia gracilipes (Benth.) Steenis, Blumea 12: 359, 1964. = Unona albida Engl., Notizbl. Königl. Bot. Gart. Berlin 2: 297, 1899; Cleistopholis albida (Engl.) Engl. & Diels, Monogr. Afrik. Pflanzen-Fam. 6: 34, 1901; Oxymitra albida (Engl.) Sprague & Hutch., Bull. Misc. Inform. Kew 1916: 153-154. 1916; Richella albida (Engl.) R.E.Fr. in Engler & Prantl, Nat. Pflanzenfam., ed. 2, 17 a(2): 139. 1959; Friesodielsia albida (Engl.) Steenis, Blumea 12: 358. 1964. Type. Cameroon. South Region, Bipinde, Zenker G.A. 1715, 1898: Lectotype, designated by Guo et al. 2017, p. 15: B[B 10 0153057]; isolectotypes: B[B 10 0153058]; BM[BM000547065, BM000843987]; BR[BR000008800121]; E[E00181435]; G[G00308362]; HBG[HBG-502539]; K[K000198947]; L[L 0187107]; M[M-0107909]; NY[NY0026308]; P[P00363331, P00363333]; S; U[U 0269929 (wood sample)]; US; WAG[WAG0061084]; WU[WU025877]. = Cleistopholis albida var. longipedicellata Baker f., in Rendle & al., Cat. Pl. Oban: 3-4, 1913; Oxymitra longipedicellata (Baker f.) Sprague & Hutch., Bull. Misc. Inform. Kew 1916: 154, 1916; Richella longipedicellata (Baker f.) R.E.Fr., in Engler & Prantl, Nat. Pflanzenfam., ed. 2, 17 a(2): 139, 1959; Friesodielsia longipedicellata (Baker f.) Steenis, Blumea 12: 360, 1964. Type. Nigeria, Oban, Talbot P.A.1677, 1912: Lectotype, designated by Guo et al. (2017b), p. 15: BM n.v.; isolectotype: BM n.v. Type. Equatorial Guinea. Bioko, Fernando Po, Mann G. 251, 1860: holotype: K[K000198951]. Description. Liana, 2-15 m tall, d.b.h. 1-3 cm. Indumentum of simple hairs; old leafless branches glabrous, drying black, young foliate branches sparsely pubescent to glabrous. Leaves: petiole up to 5 mm long, ca. 1 mm in diameter, glabrous, slightly grooved, blade inserted on the side of the petiole; blade 4.5-17 cm long, 2-6 cm wide, elliptic to ovate, apex acuminate to acute, acumen ca. 1 cm long, base acute (rarely cordate), papyraceous, below glabrous when young and old, above glabrous when young and old, discolorous, whitish below; midrib sunken or flat, above glabrous when young and old, below glabrous when young and old; secondary veins 9 to 12 pairs, glabrous above; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on young foliate branches, axillary. Flowers with 9 perianth parts in 3 whorls, 2 to 7 per inflorescence; pedicel 25-50 mm long, ca. 1 mm in diameter, glabrous; in fruit 25-40 mm long, 2-3 mm in diameter, glabrous; bracts 2, one basal and one towards the upper half of pedicel, bracts ca. 1 mm long, ca. 1 mm wide; sepals 3, valvate, free, ca. 2 mm long, ca. 2 mm wide, semiorbicular, apex rounded, base truncate, green, glabrous outside, inside pubescent towards margins but otherwise glabrous, margins flat; petals free, valvate, outer petals larger than inner; outer petals 3, 5-15 mm long, 5-10 mm wide, elliptic to ovate, apex acute, base truncate, cream to white, margins flat, glabrous outside, inside pubescent towards margins but otherwise glabrous; inner petals 3, valvate, 5-7 mm long, 2.5-3 mm wide, ovate to oblong, apex acute, base truncate, cream to bright white, margins flat, glabrous outside, glabrous inside; stamens 60 to 80, in 8 to 9 rows, ca. 2 mm long, linear; connective discoid, glabrous, white; staminodes absent; carpels free, 10 to 12, ovary 2-3 mm long, stigma filiform, glabrous. Monocarps stipitate, stipes 8-10 mm long, 2-3 mm in diameter; monocarps 10 to 14, 25-30 mm long, 8-13 mm in diameter, oblong, apex rounded, glabrous, smooth, sometimes with a prominent rib when dried, red when ripe; seeds 1 to 4 per monocarp, 20-25 mm long, 7-10 mm in diameter, oblong; aril absent. Distribution. A central African species, from Nigeria to Gabon and Equatorial Guinea; in Cameroon known from the Littoral, South and South-West regions. Habitat. A fairly common species, in lowland or submontane primary or old secondary rain forests. Altitude 0-800 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Not assessed yet. Uses in Cameroon. None reported. Notes. Sphaerocoryne gracilipes is distinguished by its glaucous (light green) lower side of leaf blades, glabrous branches (or sparsely pubescent when very young), leaves and petioles, branches drying black, long pedicellate flowers (25-50 mm long) with bright white petals, and moniliform fruits. This species (and the genus) is easily confused when sterile with Monanthotaxis, both being lianas with a glaucous lower leaf surface and moniliform monocarps. However, Monanthotaxis has percurrent tertiary venation versus reticulate in Sphaerocoryne (Guo et al. 2017b). For the same reason as above, Sphaerocoryne is also very close morphologically to Afroguatteria discostigma both being lianas with glaucous lower leaf surface and reticulate tertiary venation, but Sphaerocoryne has axillary inflorescences while Afroguatteria has terminal ones (Guo et al. 2017b). The four liana genera Afroguatteria, Monanthotaxis, Sphaerocoryne and Toussaintia are phylogenetically close (Guo et al. 2017b) but remain separate on morphological grounds. In the check list to the plants of Mt Kupe and Bakossi (Cheek et al. 2004), the fruiting collection Cable 3526 (K) is cited as " Monanthotaxis sp. nov. " but is identified here as Sphaerocoryne gracilipes. The only major difference with the rest of the material is that this specimen has cordate leaf bases, when all other specimens we have seen have acute leaf bases. Specimens examined. Littoral Region: Ebo Wildlife Reserve Djuma permanent camp On Djashaka trail, 4.35°N, 10.24°E, 13 February 2014, Couvreur T.L.P. 617 (WAG,YA); Ebo Wildlife Reserve Djuma permanent camp On transect 5, 4.33°N, 10.23°E, 16 February 2013, Couvreur T.L.P. 633 (WAG,YA). South Region: N bank of Lobé river above Gr Batanga ferry ca. 9 km S of Kribi, 2.87°N, 9.893°E, 14 October 1968, Bos J.J. 3077 (P,WAG,YA); ca 9 km S of Kribi Lobe R bank E of Gr Batanga ferry, 2.86°N, 9.9°E, 11 January 1969, Bos J.J. 3602 (P,WAG,YA); Lobé R mouth 7 km S of Kribi, 2.88°N, 9.9°E, 20 March 1969, Bos J.J. 4180 (BR,K,LD,LM,MO,P,WAG,YA); 10 km From Kribi Lolodorf road, 2.96°N, 9.966°E, 27 May 1969, Bos J.J. 4655 (BR,P,WAG); Ndoumalé 11 km S of Kribi, 2.86°N, 9.9°E, 29 August 1969, Bos J.J. 5264 (WAG); Campo-Ma’an area Bibabimvoto, 2.28°N, 9.950°E, 16 August 2002, Tchouto Mbatchou G.P. 3400 (KRIBI,WAG); Campo-Ma’an area 2.28°N, 9.866°E, 02 October 2001, van Andel T.R. 4095 (KRIBI,U,WAG,YA); Bipindi, 3.08°N, 10.41°E, 1898, Zenker G.A. 1715 (E,L,WAG); Bipindi, 3.08°N, 10.41°E, 01 May 1913, Zenker G.A. 360 (U,WAG); Bipindi, 3.08°N, 10.41°E, 01 April 1914, Zenker G.A. 516 (U,WAG). South-West Region: Nyasoso, 4.84°N, 9.689°E, 02 July 1996, Cable S. 3526 (K,WAG,YA); Bayang Mbo Wildlife Sanctuary after Mbu river, 5.35°N, 9.501°E, 25 March 2016, Couvreur T.L.P. 1001 (WAG,YA); Mount Cameroon National Park on the Bomona trail behind Bomona village 10 km NW from Idenau, 4.29°N, 9.090°E, 03 April 2016, Couvreur T.L.P. 1043 (WAG,YA); Buea area at Bolifamba, 4.13°N, 9.303°E, 01 March 1929, Maitland T.D. 536 (K,K,YA); Sousi Forest, 6.36°N, 10.61°E, 16 February 2006, Onana J.M. 3612 (K); Disturbed forest Bomana and Koto II, 4.3°N, 9.05°E, 26 April 1996, Tchouto Mbatchou G.P. 1372 (K,YA); Korup National Park, 5.01°N, 8.85°E, 10 March 1986, Thomas D.W. 5727 (MO); Korup National Park, 5.33°N, 8.95°E, 25 May 1988, Thomas D.W. 7858 (P,YA).Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on pages 321-324, DOI: 10.3897/phytokeys.207.6143
∑_(l+m=k,l,m≥0) ((α+l-1)¦l) ((β+m-1)¦m)=((α+β+k-1)¦k) and its application to negative binomial distribution
Full text linkWe prove here the following equation: ∑_(l+m=k,l,m≥0) ((α+l-1)¦l) ((β+m-1)¦m)=((α+β+k-1)¦k) and give its application to prove the reproductive property of the negative binomial distribution.
These finite sum equation involving binomial coefficients and proof of the reproductive property are not known as far as the author knows.論文(Article)departmental bulletin pape
Isochronal Superposition of the Structural α-Relaxation and Invariance of Its Relation to the β-Relaxation to Changes of Thermodynamic Conditions in Methyl m-Toluate
No full textThe dielectric spectra of methyl m-toluate (MMT) in supercooled liquid and glassy states were measured over wide ranges of temperature T at ambient and elevated pressures P. We found that the frequency dispersion of the loss peak contributed by the structural α-relaxation is invariant to changes of P and T, while keeping the loss peak frequency fα(T,P) constant. This isochronal superposition property of the α-relaxation holds for different choices of fα(T,P). The invariant frequency dispersions for the same fα(T,P) are also indicated by the fractional exponent βKWW in the Fourier transform of the Kohlrausch-Williams-Watts (KWW) function. Similarly, the fragility m index of MMT keeps approximately constant on varying pressure, largely different from H-bonded glass formers. The secondary β-relaxation at a frequency higher than fα(T,P) is found to shift to lower frequencies by elevating pressure in concert with the α-relaxation. The ratio τα(T,P)/τβ(T,P) is approximately unchanged to variations of T and P while keeping τα(T,P) constant. These properties observed in MMT offer experimental evidence of the dynamic correlation between α- A nd β-relaxations in pure small-molecule glass-formers
Dioszegia kandeliae Q. M. Wang, F. Y. Bai, L. D. Guo & A. H. Li 2020, sp. nov.
No full text<p> <i>Dioszegia kandeliae</i> Q.M. Wang, F.Y. Bai, L.D. Guo & A.H. Li <i>sp. nov.</i> MycoBank MB828763. Fig. 8I.</p> <p> <i>Etymology</i>: the specific epithet <i>kandeliae</i> refers to <i>Kandelia</i>, the plant genus from which the type strain was isolated.</p> <p> <i>Culture characteristics</i>: In YM broth, after 7 d at 17 °C, cells are ellipsoidal to subglobosal, 2.5– 4.2 × 3.2– 5.5 μm and single, budding is polar (Fig. 8I), a ring and a sediment are formed. After 1 mo at 17 °C, a ring and sediment are present. On YM agar, after 1 mo at 17 °C, the streak culture is orange-red, butyrous, smooth and glossy. The margin is entire. In Dalmau plate culture on corn meal agar, pseudohyphae are not formed. Sexual structures are not observed on YM, PDA, V8 and CM agar. Ballistoconidia are not produced.</p> <p> <i>Physiological and biochemical characteristics</i>: Glucose fermentation is absent. Glucose, galactose, L-sorbose, sucrose, maltose, cellobiose, trehalose, lactose, melibiose, melezitose, inulin (weak), soluble starch (delayed and weak), D-xylose (delayed and weak), L-arabinose (delayed and weak), Dglucosamine (delayed and weak), N-Acetyl-D-glucosamine (delayed and weak), ethanol (delayed and weak), glycerol (delayed and weak), ribitol (delayed and weak) and D-glucitol are assimilated as sole carbon sources. Raffinose, D-arabinose, Dribose, L-rhamnose, methanol, erythritol, galactitol, D-mannitol, Methyl-α- D-glucoside, salicin, DL-lactate, succinate, citrate, myo-inositol and hexadecane are not assimilated. Ammonium sulfate, potassium nitrate, ethylamine hydrochloride and cadaverine dihydrochloride are assimilated as sole nitrogen sources. Sodium nitrite and L-lysine are not assimilated. Maximum growth temperature is 30 °C. Growth in vitamin-free medium is negative. Starch-like substances are produced. Growth on 50 % (w/w) glucose-yeast extract agar is negative. Urease activity is positive. Diazonium Blue B reaction is positive.</p> <p> Physiologically, <i>Di. kandeliae</i> and the closely related species <i>Di. ovata</i>, <i>Di. maotaiensis</i>, <i>Di. zsoltii</i>, <i>Di. catarinoi</i>, <i>Di. takashimae</i> and <i>Di. athyrii</i> can be distinguished from one another. <i>Di. kandeliae</i> differs from the other six species in its inability to assimilate raffinose and L-rhamnose (Table S1.9).</p> <p> <i>Typus</i>: <b>China</b>, Beilunhekou natural reserve, Guangxi province, obtained from a leaf of <i>Kandelia candel</i>, Apr. 2014, L.-D. Guo (<b>holotype</b> CGMCC 2.5658 T preserved in a metabolically inactive state, ex-type CBS 13951 = 224191).</p>Published as part of <i>Li, A. - H., Yuan, F. - X., Groenewald, M., Bensch, K., Yurkov, A. M., Li, K., Han, P. - J., Guo, L. - D., Aime, M. C., Sampaio, J. P., Jindamorakot, S., Turchetti, B., Inacio, J., Fungsin, B., Wang, Q. - M. & Bai, F. - Y., 2020, Diversity and phylogeny of basidiomycetous yeasts from plant leaves and soil: Proposal of two new orders, three new families, eight new genera and one hundred and seven new species, pp. 17-140 in Studies In Mycology 96</i> on page 90, DOI: 10.1016/j.simyco.2020.01.002, <a href="http://zenodo.org/record/10497182">http://zenodo.org/record/10497182</a>
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