22,244 research outputs found
Lycopus primus Tang and Li 2009
No full textLycopus primus Tang and Li, 2009 Lycopus primus Tang and Li, 2009a: 51, figs 4A–D, 5A–C, 6 A – E, ♂. Material examined. CHINA: Yunnan: Xishuangbanna, Mengla County, Menglun Town, Menglun Nature Reserve, G. Tang and Z. Y. Yao: 4 ♀, Lvshilin Forest Park, Limestone tropical seasonal rain forest (N21º54.600', E101º17.084', 640 m), 17 November 2009 (Tang-Yao_No.12); 1 ♀, Lvshilin Forest Park, Limestone tropical seasonal rain forest (N21º54.614', E101º16.880', 642 m), 4 December 2009 (Tang-Yao_No.42). Distribution. China (Hainan, Yunnan).Published as part of Tang, Guo & Li, Shuqiang, 2010, Crab spiders from Xishuangbanna, Yunnan Province, China (Araneae, Thomisidae) 2703, pp. 1-105 in Zootaxa 2703 on page 2
Application of hydrogen-storage alloy electrode in electrochemical reduction of glucose
No full textElectrolysis of glucose was performed at constant potential using hydrogen-storage alloy as catalytic reduction electrode. A superficial treatment and activation of the hydrogen-storage alloy powder had an obvious effect on improving the current efficiency for the generation of sorbitol. The most favorable results were obtained when a current density of 8 mA cm(-2), a voltage of 4.0-5.0 V and a pH of 8 at a temperature of 30 degreesC are used. Prior to use the electrode was treated for 2 h at 80 degreesC with a solution containing KBH4 (0.5 mol/l), KF (0.5 mol/l) and KOH (6 mol/l). Under optimized conditions the current efficiency for sorbitol by electrolyzing glucose exceeded 90%. The yield of sorbitol was around 80%. The lifetime of the electrode was tested and analyzed, and methods of regeneration are discussed. (C) 2004 Elsevier B.V. All rights reserved
Carboxylate-Enhanced Rhodium(III)-Catalyzed Aryl C-H Alkylation with Conjugated Alkenes under Mild Conditions
No full textRhodium(III)-catalyzed C-H bond functionalization for the synthesis of beta-aryl aldehydes and ketones from (hetero)aryl oximes, pyri(mi)dine, as well as pyrazoles and alpha,beta-unsaturated carbonyl compounds has been developed under exceedingly mild reaction conditions. Thus, the versatile rhodium(III) catalysis features high step- and atom-economy, oxidant-free reaction conditions, and broad substrate scope
A ±25A Versatile Shunt-Based Current Sensor with 10kHz Bandwidth and ±0.25% Gain Error from -40°C to 85°C Using 2-Current Calibration
No full textAccurate current sensing is critical in many industrial applications, such as battery management and motor control. Precise shunt-based current sensors have been reported with gain errors of less than 1% over the industrial temperature range (-40°C to 85°C) [1]–[4]. However, since they are intended for coulomb counting, their bandwidth is limited to a few tens of Hz, making them unsuitable for battery impedance or motor-current sensing. This paper presents a current sensor with a wide (10kHz) bandwidth and a tunable temperature compensation scheme (TCS), which allows it to be flexibly used with different types of shunts while maintaining high accuracy. A low-cost room-temperature calibration scheme is proposed to optimize gain flatness over temperature by exploiting the shunt's self-heating at large currents. Over the industrial temperature range and a ±25A current range, it achieves state-of-the-art gain error (±0.25%) with both low-cost PCB and stable metal-alloy shunts.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic InstrumentationMicroelectronic
Lycopus cha Tang & Li 2010, sp. nov.
No full textLycopus cha sp. nov. Figs 13–15 Type material. Holotype: ♂, CHINA: Yunnan: Xishuangbanna, Mengla County, Menglun Town, Menglun Nature Reserve, G213 Roadside, Anogeissus acuminate Plantation (N21º53.992', E101º16.948', alt. 596 m), 2 December 2009, G. Tang and Z. Y. Yao (Tang-Yao_No.38). Paratypes: 2 ♀, same data as holotype. Etymology. The specific name is from Chinese word for fork (chā), refers to the distal of RTA fork-shaped, noun in apposition. Diagnosis. This new species is similar to L. primus Tang and Li, 2009, but can be separated by: the large, distally bifurcated ramus of RTA (palm-shaped, not bifurcated in L. primus) and the slender copulatory ducts (short in L. primus). Description. Male (holotype measured): Total length 3.80. Prosoma length 1.40, width 1.45; opisthosoma length 2.60, width 1.20. Prosoma yellow with setae sparsely. Eye tubercles grayish black. Eye measurements: AME 0.06; ALE 0.11; PME 0.06; PLE 0.09; AME–AME 0.14; AME–ALE 0.12; PME–PME 0.11; PME–PLE 0.29. MOA length 0.34 with front width 0.24 and back width 0.22. Chelicerae, gnathocoxae, labium and sternum yellow. Legs yellow, femora and tibiae of I, II red distally. Leg measurements: I: 8.40 (2.50, 3.00, 1.90, 1.00); II: 8.45 (2.50, 2.95, 2.00, 1.00); III: 3.65 (1.20, 1.25, 0.70, 0.50); IV: 4.20 (1.40, 1.40, 0.80, 0.60). Leg formula: 2143. Opisthosoma dorsally yellow with slivery white spots. Palp (Figs 13 B–D, 15 A–B). VTA strongly sclerotized; RTA large, with a small ramus digitiform, the large ramus bifurcated distally; tegulum swollen without apophysis; embolus slender. Female (one of the paratypes measured): Total length 4.40. Prosoma 1.80 long, 1.50 wide; opisthosoma 2.80 long, 1.40 wide. Dorsal shield of prosoma yellowish green, head area with sparse setae. Eye measurements: AME 0.06; ALE 0.10; PME 0.05; PLE 0.09; AME–AME 0.18; AME–ALE 0.18; PME–PME 0.26; PME–PLE 0.38. MOA length 0.28 with front width 0.28 and back width 0.36. Chelicerae, gnathocoxae, labium and sternum yellow. Legs yellow with spines. Leg measurements: I: 6.10 (1.80, 2.20, 1.40, 0.70); II: 6.20 (1.90, 2.20, 1.40, 0.70); III: 3.30 (1.00, 1.20, 0.60, 0.50); IV: 3.80 (1.30, 1.30, 0.70, 0.50), leg formula: 2143. Opisthosoma dorsally yellowish with slivery spots. Epigynum (Figs 14 B–C, 15 C–D). Epigynum light yellow, with an anteriorly situated hood and a pair of lateral grooves; copulatory openings posteriorly situated; copulatory ducts slender, twisted, translucent anteriorly; spermathecae small, globular. Variation. Total length: ♀ 4.40–4.50 (n=2). Distribution. China (Yunnan).Published as part of Tang, Guo & Li, Shuqiang, 2010, Crab spiders from Xishuangbanna, Yunnan Province, China (Araneae, Thomisidae) 2703, pp. 1-105 in Zootaxa 2703 on page 2
Gabosines L, N and O: New carba-sugars from Streptomyces with DNA-binding properties
No full textIn addition to the known gabosines A (4), B (5) and C (6), three new gabosines L (1), N (2) and O (3) were detected by chemical screening as secondary metabolites of Strep- tomyces (strains GT 041230, GT 051024 and S 1096). The constitutions of 1, 2 and 3 were established by spectroscopic techniques and derivatization reactions. The absolute stereochemistry of 1 and 2 was determined by Helmchen's method and has been verified in the case of gabosine N (2) by X-ray analysis. The DNA-binding properties of the gabosines were investigated and analyzed by binding studies using a recently developed thin-layer chromatography technique (bimolecular-chemical screening)
An improvement on "Integrated production strategy and reuse scenario : a CoFAQ model and case study of mail server system development"
No full textThe authors (Tang et al. (2013) [1] developed a CoFAQ model to formulate a solution for the problem of production strategy decision and reuse scenario selection for a software product family. In the previous research, we stated that the CoFAQ model was a 0-1 mixed integer nonlinear program, where only a local optimal solution might be found. In a recent study, we found that the CoFAQ could be transformed into a 0-1 mixed integer linear programming model. By solving the model, a global optimal solution can be obtained. In this paper, we present the improved formulation and the optimal solution for the case study.Department of Industrial and Systems Engineerin
Gabosines L, N and O: New carba-sugars from Streptomyces with DNA-binding properties
No full textIn addition to the known gabosines A (4), B (5) and C (6), three new gabosines L (1), N (2) and O (3) were detected by chemical screening as secondary metabolites of Strep- tomyces (strains GT 041230, GT 051024 and S 1096). The constitutions of 1, 2 and 3 were established by spectroscopic techniques and derivatization reactions. The absolute stereochemistry of 1 and 2 was determined by Helmchen's method and has been verified in the case of gabosine N (2) by X-ray analysis. The DNA-binding properties of the gabosines were investigated and analyzed by binding studies using a recently developed thin-layer chromatography technique (bimolecular-chemical screening)
Identification and characterization of proteins interacting with metabotropic glutamate receptor subtype 8
No full textGroup III presynaptic metabotropic glutamate receptors (mGluRs) play a central role in regulating presynaptic activity through G-protein effects on ion channels and signal transducing enzymes. Like all Class C G-protein coupled receptors, mGluR8 has an extended intracellular C-terminal domain (CTD) presumed to allow for modulation of downstream signaling. To elucidate the function and modulation of mGluR8, yeast two-hybrid screens of an adult rat brain cDNA library were performed with the CTDs of mGluR8a and 8b (mGluR8-C) as baits. Different components of the sumoylation cascade (ube2a, sumo-1, Pias1, Pias gamma and Pias xbeta) and some other proteins were identified as mGluR8 interacting proteins. Binding assays using recombinant GST-fusion proteins confirmed that Pias1 interacts not only with mGluR8-C, but all group III mGluR CTDs. Pias1 binding to mGluR8-C required a region N-terminally to a consensus sumoylation motif and was not affected by arginine substitution of the conserved lysine K882 within this motif. Co-transfection of fluorescently tagged mGluR8a-C, sumo-1 and enzymes of the sumoylation cascade into HEK 293 cells showed that mGluR8a-C can be sumoylated in cells. Arginine substitution of lysine K882 within the consensus sumoylation motif, but not of other conserved lysines within the CTD, abolished in vivo sumoylation. The results are consistent with post-translational sumoylation providing a novel mechanism of group III mGluR regulation.Die presynaptischen metabotropen Glutamat-Rezeptoren der Gruppe III (mGluRs) spielen eine zentrale Rolle in der Regulation presynaptischer Aktivität über G-Protein-Effekte auf Ionenkanäle und signalübertragende Enzyme. Wie alle G-Protein-gekoppelten Rezeptoren der Klasse C hat auch mGluR8 eine verlängerte intrazelluläre C-terminale Domäne (CTD), die vermutlich die Modulation nachgeordneter Signale erlaubt. In einem Hefe-Zwei-Hybrid-Screen einer cDNA-Bibliothek aus adultem Rattenhirn, in welchem CTDs vom mGluR8a und 8b (mGluR8-C) als “Köder” verwendet wurden, konnten neben anderen Proteinen verschiedene Komponenten der Sumoylierungskaskade (ube2a, sumo-1, Pias1, Pias gamma, Pias xbeta) als Interaktionspartner identifizieret werden. Bindungsexperimente mit rekombinanten GST-Fusionsproteinen bestätigten, daß Pias1 nicht nur mit mGluR8-C, sondern mit allen Gruppe III mGluR CTDs interagiert. Die Pias1-Bindung an mGluR8-C benötigt eine N-terminal des Sumoylierungs-Konsensusmotivs liegende Region und wird nicht beeinträchtigt durch Arginin-Austausch des innerhalb dieser Region liegenden, konservierten Lysin-Restes K882. Kotransfektionsexperimente mit fluoreszenzmarkiertem mGluR8a-C, Sumo1 und Enzymen der Sumoylierungskaskade in HEK293-Zellen zeigten, daß mGluR8a-C in vivo sumoyliert werden kann. Der Arginin-Austausch des Lysin-Restes K882, jedoch nicht Austausche von anderen konservierten Lysin-Resten innerhalb der CTD-Domäne, verhinderte die in vivo Sumoylierung. Unsere Ergebnisse deuten darauf hin, daß die posttranslationale Sumoylierung einen neuen Mechanismus der Gluppe III mGluR Regulation darstellt
C–H Alkylations of (Hetero)Arenes by Maleimides and Maleate Esters through Cobalt(III) Catalysis
No full textEfficient cobalt(III)-catalyzed (hetero)aryl and alkenyl C-H hydroarylations of maleimides and maleate esters have been achieved under remarkably mild reaction conditions. Thus, the versatile cobalt(III) catalyst [Cp CoI2(CO)] showed excellent atom-and step-economy as well as high chemo- and site-selectivity providing expedient access to pharmacologically useful succinimides with wide functional group tolerance
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