56,173 research outputs found
Analyse des signaux multicomposante à modulation de fréquence linéaire par la transformation de Teager-Huang-Hough
No full textA novel detection approach of linear FM (LFM) signals, with single or multiple components, in the time-frequency plane of Teager-Huang (TH) transform is presented. The detection scheme that combines TH transform and Hough transform is referred to as Teager-Huang-Hough (THH) transform. The input signal is mapped into the time-frequency plane by using TH transform followed by the application of Hough transform to recognize time-frequency components. LFM components are detected and their parameters are estimated from peaks and their locations in the Hough space. Advantages of THH transform over Hough transform of Wigner-Ville distribution (WVD) are: 1) cross-terms free detection and estimation, and 2) good time and frequency resolutions. No assumptions are made about the number of components of the LFM signals and their models. THH transform is illustrated on multicomponent LFM signals in free and noisy environments and the results compared with WVD-Hough and pseudo-WVD-Hough transforms
Zhuliangomyces bambusus T. Huang & L. P. Tang 2022, sp. nov.
No full textZhuliangomyces bambusus T. Huang & L.P. Tang, sp. nov. (Figs. 2, 4 & 6a–b). MycoBank:— MB 839033. Diagnosis:— Zhuliangomyces bambusus is similar to Z. ochraceoluteus, differs from the latter in its light brown pileus, with grayish tone at age, predominantly subglobose basidiospores (3.5–4.5 × 3–4.5 μm, Q m = 1.06), and habitat in bamboo duff. Holotype:— CHINA. HAINAN PROVINCE, Wuzhishan City, fruiting in a small group in the rich litter of Pseudosasa cantorii leaves, 18°51′56”N, 109°40′54”E, elev. 640 m, 12 th August 2020, L. P. Tang 3205 (MHKMU L. P. Tang 3205 !). Etymology:—“ bambusus ” indicates that the species fruits in duff of Pseudosasa cantorii, a kind of bamboo growing in tropical parts of China. Gene sequences ex-holotype:— MW732473 (ITS) and MW732414 (LSU). Description:— Basidiomata small-sized. Pileus 35–40 mm diam., hemispherical at first, soon becoming convex, then plano-convex or plane, uplifted when mature, margin striate; surface smooth, strongly viscid, light brown to grayish-brown (5B2–5B4), more or less with grayish tone at age, often slightly darker at center; context quite thin, white (1A1), unchanging; whole pileus easily falling off or separated from stipe collecting. Lamellae free, somewhat distant, up to 3 mm in width, white to cream (2A1), L = 80–90, l = 1–2. Stipe 30–45 × 2–4 mm, central, cylindrical, slightly attenuate upwards, glabrous, viscid, light brown or pale brown (5B2–5B4); stipe base slightly enlarged; basal mycelium white, often with several rhizomorphs; context white (1A1), unchanging, soft to partially hollow in center. Annulus apical, light brown (5B2–5B4), strongly viscid, usually attached to pileus margin. Odor indistinct. Taste not recorded. Basidiospores [80/4/2] (3) 3.5–4.5 (5) × 3.0–4.5 μm, Q = 1.03–1.07, Q m = 1.06 ± 0.01 (under SEM), mostly subglobose, occasionally globose, inamyloid, hyaline, thin-walled, smooth under the light microscope, but verruculose under SEM; apiculus relatively short. Basidia 21–26 × 5–7 μm, clavate, 4-spored; sterigmata 3–5 μm long. Cystidia absent. Lamella trama bilateral. Mediostratum 20–45 μm wide, composed of abundant, ellipsoid to clavate inflated cells 37–85 × 7–11 μm; filamentous hyphae 3–11 μm diam., abundant; vascular hyphae rare. Lateral stratum composed of abundant, ellipsoid to clavate inflated cells 20–75 × 6–12 μm; filamentous hyphae 3–10 μm diam. Subhymenium 20–60 μm thick, with 2–4 layers of subglobose, ovoid to ellipsoid or irregular cells 7–30 × 6–18 μm. Pileipellis 80–110 μm thick, an ixotrichoderm composed of vertically arranged, septate, filamentous hyphae with terminal cells cylindrical to narrowly clavate 35–70 × 2–5 μm. Stipe trama composed of longitudinally arranged, ellipsoid to long clavate terminal cells 52–205 × 12–35 μm, thick-walled; filamentous hyphae 4–10 μm diam., slightly thick-walled, abundant; vascular hyphae rare. Clamp connections abundant, present in all parts of basidiomata. Habitat:— Gregarious in small groups in duff of decaying bamboo leaves or branches; fruiting in August. Distribution:— Hainan Province, China. Additional specimen examined:— CHINA. HAINAN PROVINCE, Wuzhishan City, in small groups growing in bamboo duff of Pseudosasa cantorii, 18°51′56″N, 109°40′55″E, elev. 650 m, 12 th August 2020, H. Y. Huang 757 (MHKMU H. Y. Huang 757).Published as part of Huang, Ting, Zhang, Wen-Hao, Huang, Hong-Yan, Gu, Yan-Ming & Tang, Li-Ping, 2022, Two new species of Zhuliangomyces (Amanitaceae) from Hainan Island, China, pp. 57-67 in Phytotaxa 575 (1) on pages 60-62, DOI: 10.11646/phytotaxa.575.1.3, http://zenodo.org/record/740320
Virus-like particles production in green plants
No full textViruses-like particles (VLPs), assembled from capsid structural subunits of several different viruses, have found a number of biomedical applications such as vaccines and novel delivery systems for nucleic acids and small molecules. Production of recombinant proteins in different plant systems has been intensely investigated and improved upon in the last two decades. Plant-derived antibodies, vaccines, and microbicides have received great attention and shown immense promise. In the case of mucosal vaccines, orally delivered plant-produced VLPs require minimal processing of the plant tissue, thus offering an inexpensive and safe alternative to more conventional live attenuated and killed virus vaccines. For other applications which require higher level of purification, recent progress in expression levels using plant viral vectors have shown that plants can compete with traditional fermentation systems. In this review, the different methods used in the production of VLPs in green plants are described. Specific examples of expression, assembly, and immunogenicity of several plant-derived VLPs are presented
Corrigendum
No full textHao Z, Zheng L, Kluwe L, Huang W. Ferritin light chain and squamous cell carcinoma antigen 1 are coreceptors for cellular attachment and entry of hepatitis B virus. Int J Nanomedicine. 2012;7:827–834. 1. The third affiliation, for Weida Huang, was incorrectly given as:3Laboratory for Synthetic Biology, Centers for Nano-Medicine, Shanghai, People’s Republic of China.The correct affiliation is as follows:3Laboratory for Synthetic Biology, Centers for Nano-Medicine, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, People’s Republic of China.2. Figures 1 and 2 have been corrected.Read the original articl
Efficient conversion of bicarbonate (HCO3−) to acetate and simultaneous heavy metal Cr(VI) removal in photo-assisted microbial electrosynthesis systems combining WO3/MoO3/g-C3N4 heterojunctions and Serratia marcescens electrotroph
No full textThe removal of the hazardous heavy metal Cr(VI) in water and the simultaneous production of acetate from the reduction of inorganic carbon (HCO3−) is demonstrated in a photo-assisted microbial electrosynthesis (MES) system incorporating WO3/MoO3/g-C3N4 Z-scheme heterojunctions and Serratia marcescens Q1 electrotroph cathode. The rates of acetate production (6.1 ± 0.3 mg/L/h) and Cr(VI) removal (4.5 ± 0.1 mg/L/h) recorded at a circuital current of 2.8 ± 0.1 A/m2 were 2.4-fold (acetate production), 1.7-time (Cr(VI) removal) and 1.6-fold (circuital current) of those in the controls recorded in the absence of WO3/MoO3/g-C3N4, and 1.6-fold (acetate production) and 1.8-time (circuital current) of those in the absence of both Cr(VI) and WO3/MoO3/g-C3N4. Photogenerated WO3/MoO3/g-C3N4 conduction bands electrons favored both direct or indirect (via S. marcescens) reductions of Cr(VI) and H+, with the latter producing H2 which was further metabolized by S. marcescens with HCO3− to yield acetate. The higher circuital current drawn under photoirradiation conditions refilled the photo-generated valence band holes in the semiconductor and provided the driving force for the reduction reactions. This study provides an alternative and feasible approach for achieving complete removal of toxic heavy metal from water and industrial waters with simultaneous conversion of inorganic carbon to key block chemicals
Calibrating a crack self-healing kinetic law for Ultra High Performance Concrete from five years of experimental work in the Horizon 2020 ReSHEALience project
No full textTo enhance the long-term durability of Ultra-High Performance Concrete (UHPC) in extremely aggres-sive environments, crystalline admixtures are used to stimulate the self-healing of cracks with different widths, also ensuring the recovery of the mechanical and durability performance of the material. The geometrical characteristics of these cracks play a crucial role in determining the extent of the penetra-tion of harmful substances into the composite cementitious matrix and are also important factors gov-erning the self-healing mechanisms in concrete. Among these geometric characteristics, crack width is of paramount importance and should be given priority in the evaluation of crack self-healing processes. This study, conducted under the umbrella of the ReSHEALience project, funded by the European Com-mission in the framework of the Horizon 2020 Research and Innovation programme (GA760824), used image collection techniques to capture the geometric characteristics of concrete cracks in beams and Double Edge Wedge Splitting (DEWS) test specimens and created a database of crack closures through image processing techniques. A set of plural experimental campaigns which have spanned over five years and have included different environmental exposure conditions, matrix compositions and times has been considered. The results show that the smaller crack width range (0-50 μm) has a higher rate of crack healing in all environments, while the 50-300 μm crack closure is slower. Moreover, complete immersion in a salt water environment resulted in faster closure of cracks with a width range of 0-20 μm in a shorter period of time. Based on the analysis of this database, this paper presents the calibration of a crack closure kinetic model for different crack width ranges (0-20, 20-50, 50-100, 100-300 μm) in different healing environments and along time, in order to provide a basis for further refine crack heal-ing simulation and modelling and further contribute to lay out a durability based design approach for UHPC structural applications
L estimates for degenerate non-local Kolmogorov operators
No full textLet , with . We prove a priori estimates of the following type :
\|\Delta_x^\frac \alpha 2 v \|_L^p(\R^N) \le
c_p
\Big \| L_x v + \sum_i,j=1^Na_ijz_i\partial_z_j v \Big \|_L^p(\R^N),
\;\; 1
for ,
where is a non-local operator comparable with the -fractional Laplacian in terms of symbols, .
We require that when is replaced by the classical -Laplacian , i.e., in the limit local case , the operator
\Delta_x + \sum_i,j=1^Na_ijz_i\partial_z_j satisfy
a weak type H\"ormander condition with invariance by suitable dilations. Such estimates were only known
for .
This is
one of the first results on estimates for degenerate non-local operators under H\"ormander type conditions.
We complete our result on -regularity for L_x + \sum_i,j=1^Na_ijz_i\partial_z_j by proving
estimates like
\beginequation* \labelnew
\|\Delta_y_i^\frac \alpha_i 2 v \|_L^p(\R^N) \le
c_p
\Big \| L_x v + \sum_i,j=1^Na_ijz_i\partial_z_j v \Big \|_L^p(\R^N),
\endequation*
involving fractional Laplacians in the degenerate directions (here depends on and on the numbers of commutators needed to obtain the -direction). The last estimates are new even in the local limit case which is also considered
Metabolic versatility of small archaea Micrarchaeota and Parvarchaeota
No full textChen, L.-X., Méndez-García, C., Dombrowski, N., Servín-Garcidueñas, L.E., Eloe-Fadrosh, E.A., Fang, B.-Z., Luo, Z.-H., Tan, S., Zhi, X.-Y., Hua, Z.-S., Martinez-Romero, E., Woyke, T., Huang, L.-N., Sánchez, J., Peláez, A.I., Ferrer, M., Baker, B.J., Shu, W.-S
Chamaegastrodia guidongensis L. Wu, H. Z. Tian & C. Z. Huang 2022, sp. nov.
No full textChamaegastrodia guidongensis L.Wu, H.Z.Tian & C.Z.Huang, sp. nov. (Fig. 2, 3) Type: — CHINA. Hunan: Guidong County, Dongluo Village, 765 m, 20 July 2021, flowering period, A . Liu, Y. K. Gong & M. Z. Huang LK1671 (holotype: CSFI!, isotype: HSNU!); CHINA. Hunan: Guidong County, Dongluo Vilage, 12 October 2020, fruiting period, H. L . Liu et al. 30145 (paratype: HNNU!) Diagnosis: —The new species is distinct from other Y-shaped and T-shaped lip species of Chamaegastrodia by its unique canoe-shaped lip. It is most close to C. vaginata, but distinguishes by the lip and 2 triangular fleshy wings attached to the apex of column. Description: —Plant 10–25 cm, leafless. Rhizome, stout, 3–8 mm in diam., fleshy, translucent, glossy, light yellow to pale hazel red, with sparse short branches; mature branches ca. 8 mm, short, coralloid, brown to white fading from base to apex; sparse short fiber no more than 3 mm, slender. Stem 7–20 cm, ca. 3 mm diam., erect, pale hazel, covered with overlapping sheathing scales; scales 7–15 mm, decurrent at base and acuminate to abruptly tapered at the apex, pale-hazel in color, translucent, membranous, with short fleshy puberulent. Inflorescence with 3–9 flowers, puberulous rachis ca. 3.3 cm, elongating during fruiting; floral bracts, ca. 7 mm, as 2/3 the length of the ovary, ovate to lanceolate, orange-yellow to pale brown, depth and reverse warping at apex, with uneven surface; pedicel and ovary fusiform, ca. 8 mm, finely puberulous. Flowers non-resupinate; sepals fawn-colored, orange-yellow at apex, translucent, membranous, densely puberulous externally; dorsal sepal ca. 1.7 × 4.5 mm, ovate, acute, with many parallel distinct veins; lateral sepals ca. 6.4 × 3.1 mm, falcate, acute, with one distinct midvein and many parallel veins; petals ca. 4.8 × 2.3 mm, falcate, acute, pale yellow-orange at base, translucent, membranous, parallel veins only at apex; lip ca. 9.3 mm, canoe-shaped, margin wavy, folded inward, mid-part concaved with ridged midvein, wrinkled outside but smooth inside; hypochile dilated 3-times than epichile, concave-saccate wrapping the column up, yellow-orange, containing 2 sessile, sarcoma-shaped orange calli at base, one on each side of the sac; epichile, folded tightly, fawn; column ca. 5.0 × 2.2 mm, short, with 2 triangular, fleshy wings attached to apex vertically; anther ca. 0.8 × 0.1 mm, long-ovoid, attached to column via a short linear filament; rostellum forked, ca. 2.3 mm, erect, longer than the anther cap peak. Etymology: —The species epithet refers to the type locality, Guidong County, Hunan province. Chinese vernacular name:—桂东eạ兰 [guì dōng dié qiào lán]. Distribution and habitat: —The new species grows in humus-rich soil under broad-leaved forest at elevations of 700— 900 m. Phenology: —Flowering in mid-July; fruiting from August to October. Conservation status: —The populations of Chamaegastrodia guidongensis have only been found in Dongluo Village, with at most 100 m 2 distribution area and less than 50 mature individuals. It is worth mentioning that the size of populations declined than we observed in 2020, but the reason for the drift is unknown. As the populations are in the inaccessible habitat and no use of this species for traditional medicine were reported in local area. According to the Guidelines for using the IUCN Red List Categories and Criteria (2022), the new species should be temporarily assigned as ‘Critically Endangered’ (CR B2a & D) by its limited populations, localities and vulnerable habitats.Published as part of Qu, Chen-Hui, Jin, Yue, Yu, Xun-Lin, Huang, Cun-Zhong, Wu, Lei & Tian, Huai-Zhen, 2022, Chamaegastrodia guidongensis (Orchidaceae), a new species from Hunan, China, pp. 267-272 in Phytotaxa 555 (3) on pages 268-271, DOI: 10.11646/phytotaxa.555.3.6, http://zenodo.org/record/691139
Lyman break galaxies and the star formation rate of the Universe at z ~ 6
No full textWe determine the space density of UV-luminous starburst galaxies at z≈ 6 using deep HST ACS SDSS-i′ (F775W) and SDSS-z′ (F850LP) and VLT ISAAC J and Ks band imaging of the Chandra Deep Field South. We find eight galaxies and one star with (i′−z′) > 1.5 to a depth of z′AB= 25.6 (an 8σ detection in each of the 3 available ACS epochs). This corresponds to an unobscured star formation rate of ≈15 h−270 M⊙ yr−1 at z= 5.9, equivalent to L* for the Lyman-break population at z= 3–4 (ΩΛ= 0.7, ΩM= 0.3). We are sensitive to star-forming galaxies at 5.6 ≲z≲ 7.0 with an effective comoving volume of ≈1.8 × 105h−370 Mpc3 after accounting for incompleteness at the higher redshifts due to luminosity bias. This volume should encompass the primeval subgalactic-scale fragments of the progenitors of about a thousand L* galaxies at the current epoch. We determine a volume-averaged global star formation rate of (6.7 ± 2.7) × 10−4h70 M⊙ yr−1 Mpc−3 at z∼ 6 from rest-frame UV selected starbursts at the bright end of the luminosity function: this is a lower limit because of dust obscuration and galaxies below our sensitivity limit. This measurement shows that at z∼ 6 the star formation density at the bright end is a factor of ∼6 times less than that determined by Steidel et al. for a comparable sample of UV-selected galaxies at z= 3–4, and so extends our knowledge of the star formation history of the Universe to earlier times than previous work and into the epoch where reionization may have occurred
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