424 research outputs found
Chinogastrura flectoseta Lin & Xia 1983
No full textC. flectoseta Lin & Xia, 1983 Distribution: China, Guangdong province, Conghua (Lin & Xia 1983). Note. Reevaluation of the taxonomic position of this unusual and doubtful species with the B type chaetotaxy (suggested by comparison with C. armata), 7 + 7 ocelli, about 10 setae on dens and strongly bent setae on ant. IV is needed.Published as part of Jia, Junli, Skarżyński, Dariusz & Li, Youlian, 2010, Ceratophysella taiguensis sp. nov. (Collembola, Hypogastruridae) from China, with an annotated checklist of Chinese Ceratophysella Börner, 1932, pp. 57-63 in Zootaxa 2644 on page 61, DOI: 10.5281/zenodo.19865
A new species of Wesmaelia Foerster (Hymenoptera: Braconidae:Euphorinae) from China
No full textLi, Jun, Zheng, Min-Lin, Yao, Junli, Chen, Jia-Hua (2019): A new species of Wesmaelia Foerster (Hymenoptera: Braconidae:Euphorinae) from China. Zootaxa 4701 (1): 91-96, DOI: https://doi.org/10.11646/zootaxa.4701.1.
FIGURES 1–6 in A new species of Wesmaelia Foerster (Hymenoptera: Braconidae:Euphorinae) from China
No full textFIGURES 1–6. Wesmaelia longius sp. nov., ♀, holotype. 1. lateral habitus, 2. antenna, 3. head (dorsal view), 4. head (frontal view), 5. mesosoma (dorsal view), 6. mesosoma (lateral view)Published as part of Li, Jun, Zheng, Min-Lin, Yao, Junli & Chen, Jia-Hua, 2019, A new species of Wesmaelia Foerster (Hymenoptera: Braconidae:Euphorinae) from China, pp. 91-96 in Zootaxa 4701 (1) on page 94, DOI: 10.11646/zootaxa.4701.1.7, http://zenodo.org/record/355786
Soil Total Nitrogen and Natural<sup>15</sup>Nitrogen in Response to Long-Term Fertilizer Management of a Maize–Wheat Cropping System in Northern China
No full textIn‐situ Construction of Poly(tetraisopentyl acrylate) based Gel Polymer Electrolytes with LixLa2‐xTiO3 for High Energy Density Lithium‐Metal Batteries
No full textAs promising alternatives to liquid electrolytes, polymer electrolytes attract much research interest recently, but their widespread use is limited by the low ionic conductivity. In this study, we use electrostatic spinning to introduce particles of an ionic conductor into polyacrylonitrile (PAN) fibers to prepare a porous membrane as the host of gel polymer electrolytes (GPEs). The relevant in-situ produced GPE performs a high ionic conductivity of 6.0×10−3 S cm−1, and a high lithium transfer number (tLi+) of 0.85 at 30 °C, respectively. A symmetrical Li cell with this GPE can cycle stably for 550 h at a current density of 0.5 mA cm−2. While the capacity retention of the NCM|GPE|Li cell is 79.84 % after 500 cycles at 2 C. Even with an increased cut-off voltage of 4.5 V, the 1st coulomb efficiency reaches 91.58 % with a specific discharge capacity of 213.4 mAh g−1. This study provides a viable route for the practical application of high energy density lithium metal batteries
Wesmaelia Foerster 1862
No full textWesmaelia Foerster, 1963 Type species: Wesmaelia petiolata (Wollaston), 1858:18–28. [= Wesmaelia pendula Forster,1863:225–288]. Diagnosis. Head transverse; antenna with 13–31 flagellomeres; maxillary palp 6 segments; labial palp 3 segments; eyes with setae; frons punctate; frontal carina ending near frontal ocellus; occipital carina complete; epistomal suture and malar suture present; malar space short, less than one third height of eye; mandibles overlapping more than half length of mandible; precoxal sulcus and notauli present; propodeum areolate; veins 1-SR+M and 2-M of fore wing present; vein r-m of fore wing absent; vein M+CU1 of fore wing unsclerotized; vein M+CU of hind wing longer than 1-M; vein cu-a of hind wing present; tarsal claws simple; inner hind tibial spur of male subtruncate; first metasomal tergite long, 0.5 × length of metasoma, media width longer than apical width, entirely fused ventrally, dorsope and laterope absent; apex of third metasomal tergite nearly reaching apex of metasoma, covering sternites, without lateral fold; hypopygium of female with short setae apically; ovipositor short (Chen & van Achterberg 1997). The genus Wesmaelia is easy to distinguished from its related euphorine genera by long and posteriorly nonbroadening petiole; mesosoma (except propodeum) smooth (at most mesonotum punctate) to polished; vein r-m of fore wing absent; notauli present; slender legs (Papp 1995). Distribution. Nearctic, Palearctic, Neotropical and Oriental regions (Yu et al. 2016). Biology. The known host of W. petiolata: Nabis alternatus, Nabis americoferus and Nabis capsiformis (P.M. Marsh 1979). W.lepos is attracted to light (Belokobylskij 1998).Published as part of Li, Jun, Zheng, Min-Lin, Yao, Junli & Chen, Jia-Hua, 2019, A new species of Wesmaelia Foerster (Hymenoptera: Braconidae: Euphorinae) from China, pp. 91-96 in Zootaxa 4701 (1) on page 92, DOI: 10.11646/zootaxa.4701.1.7, http://zenodo.org/record/355786
Bridging the gap between research and practice: construction and validation of a CDA-informed English reading test for China's twelfth graders
No full textAssessment should be made more useful for promoting students' learning success. Although recent research advances in cognitive diagnostic assessment (CDA) move in this direction, most CDA studies of second language (L2) reading tend to identify examinees' mastery of skills by using the existing tests that were not originally designed for diagnostic purposes (e.g., Buck, Tatsuoka, & Kostin, 1997; Kasai, 1997).This has led to inaccurate and/or unsatisfactory diagnostic inferences, as many skills are rarely, if ever, measured in such tests (e.g., Alderson, 2010; Jang, 2009).
By constructing a CDA-informed test, this study aims to diagnose Chinese twelfth graders' strengths and weaknesses in reading comprehension, and thus contribute to enhanced instruction and learning. Approximately 1,311 students and their English teachers from one high schools in China participated in this research . Using Cognitive Design System (CDS) approach (Embretson, 1994, 1998), this study integrated a cognitive framework from the outset into the whole test development primarily concerning three key issues: what to diagnose, how to diagnose, and how to use the diagnostic information. An integrated mixed methods research design (Greene, 2007) was developed over the following four phases to address the issues.
In the first stage, this study built a cognitive model, identified eight skills, and specified their hierarchical relationships. The cognitive model was built and iteratively refined by integrating information from a thorough literature review, students’ think-aloud protocols, and opinions from content experts. The results from the statistical analysis also demonstrate that the cognitive model is appropriate for this study, since the value of hierarchy consistency index (HCI) is .66, and about 60% of the variance on item difficulty in the regression analysis can be explained by the skills specified in the model. In the second stage, the test specifications were designed to provide a generative requirement for creating test tasks, and the Q matrix was for guiding the writing of each specific item. Thirty multiple-choice items were initially created and refined iteratively through pilot tests.
Then, at the third and fourth stage, the test response data were analyzed, and both quantitative and qualitative evidence was used to support test inferences. Quantitatively, the response data was first analyzed in the conventional Reparametrized Unified Model (RUM), then in the reduced Re-parameterized Unified Model (r-RUM) by incorporating the attribute hierarchy in data analysis (i.e., the new model was referred to as the rRUM-AH). As presented in the empirical and simulation studies, both the MCMC chain and burn-in period were shorter in the rRUM-AH than the RUM, indicating that it is comparatively easier to get converged in the rRUM-AH than the RUM. In addition, the model-data fit and skill classification accuracy in the rRUM-AH were compared to several other cognitive diagnostic models (CDMs) with attribute hierarchy to determine which model was best for this study. Furthermore, qualitative evidence (e.g., interviews, classroom observations, and surveys) was collected for the evaluation of diagnostic feedback on learning.
Situated at the intersection of theories of L2 reading, cognition, and measurement, this dissertation project narrates a validation process for developing a CDA-informed English reading test. Thus it strengthens validity arguments and enhances understanding of the complexity of CDA test construction. As one of the first to develop a CDA-informed L2 reading test, this study is also unique in incorporating the hierarchical structures of the reading skills in test design, development and validation.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2018-08-01The student, Junli Wei, accepted the attached license on 2016-07-12 at 12:36.The student, Junli Wei, submitted this Dissertation for approval on 2016-07-12 at 12:38.This Dissertation was approved for publication on 2016-07-13 at 09:28.DSpace SAF Submission Ingestion Package generated from Vireo submission #9890 on 2016-11-10 at 12:20:31Made available in DSpace on 2016-11-10T18:27:47Z (GMT). No. of bitstreams: 4
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Previous issue date: 2016-07-13Embargo set by: Seth Robbins for item 95363
Lift date: 2018-11-10T18:28:02Z
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Label-free electrochemical impedance detection of kinase and phosphatase activities using carbon nanofiber nanoelectrode arrays
No full textWe demonstrate the feasibility of a label-free electrochemical method to detect the kinetics of phosphorylation and dephosphorylation of surface-attached peptides catalyzed by kinase and phosphatase, respectively. The peptides with a sequence specific to c-Src tyrosine kinase and protein tyrosine phosphatase 1B (PTP1B) were first validated with ELISA-based protein tyrosine kinase assay and then functionalized on vertically aligned carbon nanofiber (VACNF) nanoelectrode arrays (NEAs). Real-time electrochemical impedance spectroscopy (REIS) measurements showed reversible impedance changes
upon the addition of c-Src kinase and PTP1B phosphatase. Only a small and unreliable impedance variation was observed during the peptide phosphorylation, but a large and fast impedance decrease was observed during the peptide dephosphorylation at different PTP1B concentrations. The REIS data of dephosphorylation displayed a well-defined exponential decay following the Michaelis–Menten heterogeneous enzymatic model with a specific constant, k[subscript]c[subscript]a[subscript]t/K[subscript]m, of (2.1 ± 0.1) × 10[superscript]7 M[superscript]−[superscript]1 s[superscript]−[superscript]1. Consistent values of the specific constant was measured at PTP1B concentration varying from 1.2 to 2.4 nM with the corresponding electrochemical signal decay constant varying from 38.5 to 19.1 s. This electrochemical method can be potentially used as a label-free method for profiling enzyme activities in fast reactions
Electrochemical protease biosensor based on enhanced AC voltammetry using carbon nanofiber nanoelectrode arrays
No full textWe report an electrochemical method for measuring the activity of proteases using nanoelectrode arrays (NEAs) fabricated with vertically aligned carbon nanofibers (VACNFs). The VACNFs of ~150 nm in diameter and 3 to 5 μm in length were grown on conductive substrates and encapsulated in SiO[subscript 2] matrix. After polishing and plasma etching, controlled VACNF tips are exposed to form an embedded VACNF NEA. Two types of tetrapeptides specific to cancer-mediated proteases legumain and cathepsin B are covalently attached to the exposed VACNF tip, with a ferrocene (Fc) moiety linked at the distal end. The redox signal of Fc can be measured with AC voltammetry (ACV) at ~1 kHz frequency on VACNF NEAs, showing distinct properties from macroscopic glassy carbon electrodes due to VACNF’s unique interior structure. The enhanced ACV properties enable the kinetic measurements of proteolytic cleavage of the surface-attached tetrapeptides by proteases, further validated with a fluorescence assay. The data can be analyzed with a heterogeneous Michaelis-Menten model, giving “specificity constant” k[subscript cat]/K[subscript m] as (4.3 ± 0.8) x 10[superscript 4] Mˉ¹sˉ¹ for cathepsin B and (1.13 ± 0.38) x 10[superscript 4] Mˉ¹sˉ¹ for legumain. This method could be developed as portable multiplex electronic techniques for rapid cancer diagnosis and treatment monitoring
Syntheses, neural protective activities, and inhibition of glycogen synthase kinase-3beta of substituted quinolines.
No full textA new series of fifteen 5-, 6-, and 8-appended 4-methylquinolines were synthesized and evaluated for their neural protective activities. Selected compounds were further examined for their inhibition of glycogen synthase kinase-3β (GSK-3β) and protein kinase C (PKC). Two most potent analogs, compounds 3 and 10, show nanomolar protective activities in amyloid β-induced MC65 cells and enzymatic inhibitory activities against GSK-3β, but poor PKC inhibitory activities. Using normal mouse model, the distribution of the most potent analog 3 in various tissues and possible toxic effects in the locomotors and inhibition of liver transaminases activities were carried out. No apparent decline of locomotor activity and no inhibition of liver transaminases were found. The compound appears to be safe for long-term use in Alzheimer’s disease mouse model
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