1,276 research outputs found
P-Doped Porous Carbon as Metal Free Catalysts for Selective Aerobic Oxidation with an Unexpected Mechanism
No full textAn extremely simple and rapid (seconds) approach is reported to directly synthesize gram quantities of P-doped graphitic porous carbon materials with controlled P bond configuration. For the first time, it is demonstrated that the P-doped carbon materials can be used as a selective metal free catalyst for aerobic oxidation reactions. The work function of P-doped carbon materials, its connectivity to the P bond configuration, and the correlation with its catalytic efficiency are studied and established. In direct contrast to N-doped graphene, the P-doped carbon materials with higher work function show high activity in catalytic aerobic oxidation. The selectivity trend for the electron donating and withdrawing properties of the functional groups attached to the aromatic ring of benzylic alcohols is also different from other metal free carbon based catalysts. A unique catalytic mechanism is demonstrated, which differs from both GO and N-doped graphene obtained by high temperature nitrification. The unique and unexpected catalytic pathway endows the P-doped materials with not only good catalytic efficiency but also recyclability. This, combined with a rapid, energy saving approach that permits fabrication on a large scale, suggests that the P-doped porous materials are promising materials for “green catalysis” due to their higher theoretical surface area, sustainability, environmental friendliness and low cost.This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Nano, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/acsnano.5b07054.Peer reviewe
Lepadella hanneloreae Luo & Segers 2020, n. sp.
No full text<i>Lepadella hanneloreae</i> n. sp. <p>Figures 5 a–c, I-4</p> <p> <b>Type locality.</b> Lohulu River near Bomane, DR Congo 24 May 2010 (KM49, KM48); a few specimens from Yangambi primary forest, DR Congo, 11 June 2012 (Y25). Numerous additional specimens in the samples from the type locality.</p> <p> <b>Material examined.</b> Holotype: female specimen in permanent slide, deposited in RBINS (RIR.292); Paratypes: seven permanent slides containing one female specimen each, deposited in RBINS; five permanent slides containing two female specimens each, deposited in RBINS (RIR.293 to RIR.304), one permanent slide containing three female specimens, deposited in CSB-UK.</p> <p> <b>Differential diagnosis.</b> <i>Lepadella hanneloreae</i> <b>n. sp.</b> is strikingly similar to <i>L. amazonica</i> Segers, 1993 (in Segers <i>et al</i>. 1993b). The two differ by the dorsal carinae on the lorica: in <i>L. hanneloreae</i> <b>n. sp.</b> there is one pair of middorsal and one pair of lateral carinae, whereas in <i>L. amazonica</i> there are two pairs of closely adjacent lateral carinae. Furthermore, the new species is probably related to <i>L. berzinsi</i> Segers, 1993, but the latter has three pairs of more pronounced carinae situated at regular distances from each other.</p> <p> <b>Description.</b> Parthenogenetic female (male unknown): Lorica elongate, roughly egg-shaped, width about two thirds of length. Ventral lorica flat, dorsal domed, lorica about twice as wide as high. Head aperture ventrally a deep V-shaped sinus, dorsally semi-circular in anterior view, straight in ventral view, with stippled collar. Dorsal lorica with two pairs of longitudinal carinae: one median pair, fused in the distal third of the lorica, one lateral pair running from behind the collar to approximately level of the apertures to the dorsal antennas. Lateral edges of lorica smooth, evenly curved, posterior edge nearly straight or with a shallow median notch. Apertures to the lateral antennas situated at the level of the anterior margin of the foot aperture, arranged symmetrically about medially from the fused median carinas to the lateral margin of the lorica. Foot aperture elongate, lateral margins nearly parallel. Foot with three distinct pseudosegments, the distal one about twice as long as the second, bearing a dorsal sensory groove near its basis. Two equal toes, these evenly tapering to distally.</p> <p> <b>Measurements</b> (n=10). Lorica length: 91–106 (100), width: 60–70 (67); head aperture width: 23–37 (29), head aperture depth dorsally: 7–14 (10), ventrally: 19–24 (21); foot aperture width: 18–20 (19), length: 23–33 (27), toe length: 22–29 (25).</p> <p> <b>Etymology.</b> The specific name is as a noun in the genitive case, after Mrs Hannelore Segers, daughter of the second author of this paper.</p>Published as part of <i>Luo, Yongting & Segers, Hendrik, 2020, Eight new Lepadellidae (Rotifera, Monogononta) from the Congo bring to level endemism in Africa's rotifers, pp. 371-387 in Zootaxa 4731 (3)</i> on pages 374-376, DOI: 10.11646/zootaxa.4731.3.6, <a href="http://zenodo.org/record/3653632">http://zenodo.org/record/3653632</a>
Dryopteris jiucaipingensis (Dryopteridaceae), a New Species in Dryopteris sect. Hirtipedes from Guizhou, China
No full textA new fern species, Dryopteris jiucaipingensis P. S. Wang, Q. Luo & Li Bing Zhang (Dryopteris Adans., sect. Hirtipedes Fraser-Jenk.; Dryopteridaceae), is described and illustrated from northwestern Guizhou, China. Dryopteris jiucaipingensis is most similar to D. lunanensis (Christ) C. Chr., but the former taxon has light brown rachis scales and occurs in alpine regions (at an elevation of 2580 m), while the latter has nearly black rachis scales and is found in montane and lowland areas (below 900 m)
GHM code&data
No full textThis is the data and code related to the publication-
A generalized heterogeneity model for spatial interpolation.
The order in which the entire model performs spatial interpolation has been labeled by serial number in the code folder.
Author: Peng Luo (Technical University of Munich)
[email protected]</p
Woodsia guizhouensis (Woodsiaceae), a New Species from a Limestone Area in Guizhou, China
No full textA new pteridophyte species. Woodsia guizhouensis P. S. Wang, Q. Luo & Li Bing Zhang (Woodsiaceae), is described and illustrated from higher elevational areas in Guizhou, China. It is morphologically most similar to W. andersonii (Bedd.) Christ and W rosthorniana Die Is. Woodsia guizhouensis is only 3-8 cm tall, its rhizome scales are light brown with sparsely fimbriate margins, its pinnae are short-petiolulate, and its pinna bases are cordate or sometimes rounded. The perispore sculpture of W. guizhouensis pollen is cristate, with numerous acanthoid projections and a few irregular perforations. Woodsia guizhouensis is only known from four localities in western Guizhou and is considered to be Endangered (EN), based on IUCN Red List criteria
Polystichum tiankengicola (Dryopteridaceae), a New Species from a Karst Sinkhole from Guizhou, China
No full textA new pteridophyte species, Polystichum tiankengicola Li Bing Zhang, Q. Luo & P. S. Wang (Dryopteridaceae), is described and illustrated from a high-elevational karst sinkhole from Guizhou Province in China. Morphological evidence suggests that P. tiankengicola is a member of series Basigemmifera W. M. Chu & Z. R. He in section Micropolystichum Daigobo, based on the presence of bulbils on rachis and the small habit. Polystichum tiankengicola is unique in series Basigemmifera in having a bulbil at both the base and apex of the rachis. Morphologically, the new species is most similar to P. capillipes (Baker) Diels, also of series Basigemmifera, but beyond the distinctive number of bulbils on the rachis, P. tiankengicola has a truncate lamina apex and its perispores have an echinate sculpture with irregular ridges, in contrast to P. capillipes, which has only one bulbil at the base of the rachis, an acuminate lamina apex, and perispores that have a granular sculpture. Polystichum tiankengicola is found only from the highest elevational, karst sinkhole known in China (2530 m) and is considered to be Critically Endangered (CR), based on IUCN Red List criteria
The dual role of Cr<sup>3+</sup> in trapping holes and electrons in lanthanide co-doped GdAlO<sub>3</sub> and LaAlO<sub>3</sub>
No full textTrivalent Nd, Dy, Ho, Er, Tm, Sm and Eu usually act as electron trapping centers in wide band gap compounds, whereas trivalent Ce, Tb and Pr act as hole trapping centers. When a deep electron trap is combined with a shallow hole trap, then during the thermoluminescence glow the hole is released, generating recombination luminescence at the electron trap. However, in the case of a shallow electron trap, the electron will be released to recombine at the hole trapping center. With the knowledge of the location of the lanthanide levels within the band gap, one may engineer the depth of the electron trap, the depth of the hole trap, and where the recombination will take place. This has all been tested and verified for the lanthanides in GdAlO3 (Luo et al., J. Phys. Chem. C., 2016, 120, 5916). In this work, Cr3+ is combined with various trivalent lanthanides in GdAlO3. By combining thermoluminescence with optical spectroscopy data, a consistent interpretation of all the data is obtained. Cr3+ can act both as a deep electron trap and a deep hole trap, which is different to all of the lanthanides. From the results we can deduce the location of the Cr2+ and Cr3+ levels within the band gap and with respect to the vacuum level. Besides thermoluminescence recombination via the conduction band, evidence is found for athermal (tunneling) recombination. The results for GdAlO3 are compared with the results for LaAlO3. It was found that they are related systems but LaAlO3 has a lower lying conduction band and a higher lying valence band, which reduces the trap depths of the lanthanides and Cr in a predictive fashion.RST/Fundamental Aspects of Materials and Energ
List of corresponding author countries for 2000 and 2010.
No full text<p>List of corresponding author countries for 2000 and 2010.</p
Isolation and Characterization of New p-Terphenyls with Antifungal, Antibacterial, and Antioxidant Activities from Halophilic Actinomycete Nocardiopsis gilva YIM 90087
No full textA new p-terphenyl 1 and a novel p-terphenyl derivative 3 bearing a benzothiazole moiety were isolated from halophilic actinomycete Nocardiopsis gilva YIM 90087, along with known p-terphenyl 2, antibiotic novobiocin 4, cyclodipeptides 5-13, and aromatic acids 14 and 15. Their structures were elucidated on the basis of the interpretation of spectral data and by comparison of the corresponding data with those reported previously. The p-terphenyl 1 showed antifungal activity against the three pathogenic fungi, including Fusarium avenaceum, Fusarium graminearum, and Fusarium culmorum, that caused Fusarium head blight with minimal inhibitory concentrations (MICs) of 8, 16, and 128 mu g/mL, respectively. Compound 1 showed antifungal activity against Candida albicans with a MIC of 32 mu g/mL and antibacterial activity against Bacillus subtilis with a MIC of 64 mu g/mL. Novobiocin 4 showed antifungal activity against Pyricularia oryzae with a MIC of 16 mu g/mL and antibacterial activity against B. subtilis with a MIC of 16 mu g/mL and Staphylococcus aureus with a MIC of 64 mu g/mL. The 1,1-diplkenyl-2-picryl-hydrazyl assay suggested that 1, 3, and 4 exhibited 54.9% (2 mg/mL), 14.3% (4 mg/mL), and 47.7% (2 mg/mL) free radical scavenging activity, respectively. The positively charged 2,2'-azino-bis-3-ethylbenzothiazoline-6-sulfonic acid radical (ABTS(+center dot)) scavenging assay indicated that 1, 3, 4, and 8 exhibited 68.6% (1 mg/mL), 28.4% (2 mg/mL), 78.2% (0.5 mg/mL), and 54.6% (2 mg/mL) ABTS(+center dot) scavenging capacity, respectively. The superoxide anion radical scavenging assay suggested that 4 exhibited 77.9% superoxide anion radical scavenging capacity at 2 mg/mL. N. gilva YIM 90087 is a new resource for novobiocin 4
Comparison of tests for spatial heterogeneity on data with global clustering patterns and outliers
No full textAbstract Background The ability to evaluate geographic heterogeneity of cancer incidence and mortality is important in cancer surveillance. Many statistical methods for evaluating global clustering and local cluster patterns are developed and have been examined by many simulation studies. However, the performance of these methods on two extreme cases (global clustering evaluation and local anomaly (outlier) detection) has not been thoroughly investigated. Methods We compare methods for global clustering evaluation including Tango's Index, Moran's I, and Oden's I*pop; and cluster detection methods such as local Moran's I and SaTScan elliptic version on simulated count data that mimic global clustering patterns and outliers for cancer cases in the continental United States. We examine the power and precision of the selected methods in the purely spatial analysis. We illustrate Tango's MEET and SaTScan elliptic version on a 1987-2004 HIV and a 1950-1969 lung cancer mortality data in the United States. Results For simulated data with outlier patterns, Tango's MEET, Moran's I and I*pop had powers less than 0.2, and SaTScan had powers around 0.97. For simulated data with global clustering patterns, Tango's MEET and I*pop (with 50% of total population as the maximum search window) had powers close to 1. SaTScan had powers around 0.7-0.8 and Moran's I has powers around 0.2-0.3. In the real data example, Tango's MEET indicated the existence of global clustering patterns in both the HIV and lung cancer mortality data. SaTScan found a large cluster for HIV mortality rates, which is consistent with the finding from Tango's MEET. SaTScan also found clusters and outliers in the lung cancer mortality data. Conclusion SaTScan elliptic version is more efficient for outlier detection compared with the other methods evaluated in this article. Tango's MEET and Oden's I*pop perform best in global clustering scenarios among the selected methods. The use of SaTScan for data with global clustering patterns should be used with caution since SatScan may reveal an incorrect spatial pattern even though it has enough power to reject a null hypothesis of homogeneous relative risk. Tango's method should be used for global clustering evaluation instead of SaTScan.</p
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