bluuebunny/crossref_metadata_2025_split huggingface dataset:
Characterization of sea cucumber (stichopus japonicus) ovum hydrolysates: calcium chelation, solubility and absorption into intestinal epithelial cells
Authors: Sun Na , Cui Pengbo , Lin Songyi , Yu Cuiping , Tang Yue , Wei Ye , Xiong Youling , Wu Haitao 
Published: March 2017

AbstractBACKGROUNDSea cucumber (Stichopus japonicus) ovum hydrolysates (SCOHs) chelated with calcium were produced to investigate the characteristics of calcium binding and solubility, as well as to study any effects on calcium absorption by human intestinal epithelial cells.RESULTSThe results of the present study show that the calcium‐binding capacity of SCOHs depended greatly on the type of proteases. The maximum level of Ca binding (0.38 mmol L–1) occurred when trypsin was used, with a peptide yield of 85.7%. Investigation of the possible chelating modes between SCOHs and calcium ions indicated that calcium ions bound to SCOHs primarily via interactions with carboxyl oxygen and amino nitrogen atoms of Glu and Asp and also that the phosphoserine residues might be also responsible for SCOH–calcium chelation. Moreover, SCOH–calcium complexes maintained the solubility of calcium under simulated gastrointestinal digestion, regardless of the presence of dietary components such as oxalate. Furthermore, SCOH–Ca led to higher peak intracellular [Ca2+]i in both Caco‐2 cells (338.3 nmol L–1 versus 269.6 nmol L–1) and HT‐29 cells (373.9 nmol L–1 versus 271.7 nmol L–1) than casein phosphopeptide‐Ca.CONCLUSIONCarboxyl oxygen and amino nitrogen atoms in the SCOHs could bind calcium ions, forming SCOH–calcium complexes. These complexes improved calcium solubility under simulated gastrointestinal digestion and also promoted calcium absorption in Caco‐2 and HT‐29 cells. © 2017 Society of Chemical Industry
Highly selective integrated filter antenna for UWB application
Authors: Sahoo Anuj Kumar , Gupta Ravi Dutt , Parihar Manoj Singh 
Published: March 2017

ABSTRACTAn ultrawideband (UWB) integrated filter antenna (IFA) with enhanced selectivity is proposed. A circular radiating patch is electromagnetically coupled to a UWB filter. The design provides a fractional bandwidth of 109.5% covering the entire UWB region (3.1–10.6 GHz). The peak gain of the IFA varies between 3.0 and 4.0 dBi in the desired band with efficiency of more than 90%. The gain of proposed structure is same as that of a reference standalone monopole antenna in the desired frequency band, with a decrease beyond the cut‐off frequencies. The subsystem described in this article is compact, as it does not involve any additional line to integrate the antenna and filter. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:1032–1037, 2017
Characterization of multiband antennas using the singularity expansion method
Authors: Rehman Sajjad U. , Alkanhal Majeed A.S. 
Published: March 2017

ABSTRACTThis article presents modeling of multiband antennas using the Singularity Expansion Method (SEM). The SEM with an improved pole‐residue extraction scheme is developed to precisely characterize multiband antennas in the time and frequency domains. To acquire the accurate physical complex poles and the corresponding residues of the antenna model, a two‐step modified Matrix Pencil (MP) method has been applied to the impulse response of the antenna. A specific time segment parameter TS is introduced to improve the performance of the MP method to extract the actual physical poles and eliminate the nonphysical poles caused by the early time response of the multiband antennas. Furthermore, an adjustable filtering parameter P is used to reject the low energy nonphysical poles between the sensitive multiple bands of the antenna. The proposed MP scheme is applied to the far‐field impulse response of three multiband (dual, triple, and quad band) antennas. The poles extracted by the proposed modified MP method are located precisely within the multiple operating bands of each of the tested antennas. The one set of the developed parameters is used to accurately characterize multiband antennas in both the time and frequency domains. A triple band fractal like antenna has been fabricated and its far‐field impulse response is measured and then reconstructed using the SEM based model. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:1012–1018, 2017
Broadband reflectarray composed of gap coupled elements with linear phase response
Authors: Oh Seongwon 
Published: March 2017

ABSTRACTA broadband reflectarray using gap coupled elements composed of a split ring and a dipole is proposed. The phase variation range of the reflected field from the element on a single layer is achieved larger than 418° by changing the dipole length in a split ring of a fixed size. The phase response of the field is proportional to the dipole length with a slow slope. Compared with multilayer elements and aperture coupled elements, it shows good linear phase response of the reflected field. To validate the proposed geometry, a prototype reflectarray is fabricated and measured. The maximum gain is 33.0 dB, and the 3 dB gain bandwidth is 19.0% at the center frequency of 20 GHz. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:1045–1047, 2017
A broadband dual‐polarized printed dipole antenna with low cross‐polarization and high isolation for base station applications
Authors: Yang Deqiang , Liu Sihao , Zhao Zhiqin 
Published: March 2017

ABSTRACTA dual‐polarized dipole antenna with low cross‐polarization and high isolation characteristics is presented. The proposed antenna is composed of three basic structures, i.e., a horizontal rectangular ground plate, four vertical plates with two rectangular patches on each of them, and a horizontal substrate with eight triangle patches. Every two vertical plates are put back‐to‐back which forms a double‐layered structure. Thus the transverse E‐field of the double‐layered structure is significantly reduced because of this symmetric treatment, which gives rise to very low cross‐polarization. Then the two double‐layered structures are orthogonally arranged, generating dual polarizations. Simulated and measured results show that the proposed antenna realizes an impedance bandwidth of 47% (VSWR < 1.5), ranging from 1.8 to 2.9 GHz. The isolation between the two orthometric ports is higher than 30 dB across the bandwidth. Furthermore, the cross‐polarization is −35 dB over the bandwidth. This antenna has the advantages of high isolation, low cross‐polarization, and wide bandwidth. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:1107–1111, 2017
Two components NRI metamaterial for dual band applications
Authors: Islam S.S. , Hasan M.M. , Faruque M.R.I. , Islam M.T. 
Published: March 2017

ABSTRACTIn this article, a negative index metamaterial with two components analysis for C‐ and X‐band operations has been presented. The proposed metamaterial is designed on the epoxy resin composite with woven glass fiber and this epoxy resin formation processes are also explained step by step in this study. The unit cell structure has two arrows and a metal arm is connected to the two arrows that look like a double arrow shaped metamaterial. A Finite Integration technique based CST Microwave Studio is used to figure out the scattering parameters and the designed structure is investigated in the both x‐axis and z‐axis directions. The proposed metamaterial exhibited negative refractive index characteristics with wide bandwidth in S‐, C‐, and X‐band for x‐axis wave propagations. Besides, microwave spectrum in C‐ and X‐band for z‐axis electromagnetic wave transmissions. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:1092–1096, 2017
Novel balanced composite right‐/left‐handed unit and its application in multiband power divider
Authors: Shuai Yiting , Deng Hui 
Published: March 2017

ABSTRACTA novel balanced composite right‐/left‐handed (B‐CRLH) unit is proposed and discussed. The B‐CRLH structure is composed of two inverted L‐type lines and two parallel rows of interdigital strips that are vertical to the two L‐type lines, respectively. Dispersion relation of the structure features a balanced property and a nonlinear phase response. To characterize this structure, the T‐type equivalent circuit model is established and verified by simulation. Compared with the traditional CRLH unit of the same dimension, this symmetric configuration, eliminating the undesired resonances occurred in interdigital strips, achieves wider operating bandwidth. According to the electromagnetic characteristics of the proposed structure, multiband equal split Wilkinson power dividers are realized by replacing the quarter‐wavelength transmission line with B‐CRLH units. In addition, a dual‐band power divider (PD), a quad‐band PD and a sextuple‐band PD based on the novel B‐CRLH units are designed, fabricated, and measured. Good agreement is achieved between the simulated and measured results. The experimental results show that the dual‐band PD based on one B‐CRLH unit operates at 2.16 and 3.54 GHz, and the two bandwidths can reach 34 and 25.2%. The operation frequencies of the quad‐band PD based on two B‐CRLH units are 1.49, 2.12, 2.89, and 3.72 GHz, with the input return loss better than 14 dB. The sextuple‐band PD denotes equal power division at 1.34, 1.71, 2.19, 2.77, 3.40, and 4.03 GHz, which includes three B‐CRLH units. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:1100–1107, 2017
Metasurfaced waveguide antenna with polarization rotation
Authors: Zhu H.L. , Chung Kwok L. , Wei Gao , Zhang Chunwei 
Published: March 2017

ABSTRACTWe propose a low‐cost solution for performance enhancement and polarization rotation of a waveguide antenna by using an anisotropic metasurface. The antenna is being considered as reconfigurable, where its polarizations can be controlled by changing the alignment angle of striplines on the metasurface in order to fulfil the polarization diversity. Both simulation and experimental results verify that the metasurfaced waveguide antenna can operate in the lower GSM bandwidth from 698 to 960 MHz, with a gain that varies from 5.8 to 7.8 dBi. The waveguide antenna has a compact form size of 0.70λo × 0.39λo × 0.47λo at 698 MHz. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:1084–1087, 2017
Larger men have larger prostates: Detection bias in epidemiologic studies of obesity and prostate cancer risk
Authors: Rundle Andrew , Wang Yun , Sadasivan Sudha , Chitale Dhananjay A. , Gupta Nilesh S. , Tang Deliang , Rybicki Benjamin A. 
Published: March 2017

BACKGROUNDObesity is associated with risk of aggressive prostate cancer (PCa), but not with over‐all PCa risk. However, obese men have larger prostates which may lower biopsy accuracy and cause a systematic bias toward the null in epidemiologic studies of over‐all risk.METHODSWithin a cohort of 6692 men followed‐up after a biopsy or transurethral resection of the prostate (TURP) with benign findings, a nested case‐control study was conducted of 495 prostate cancer cases and controls matched on age, race, follow‐up duration, biopsy versus TURP, and procedure date. Data on body mass index and prostate volume at the time of the initial procedure were abstracted from medical records.RESULTSPrior to consideration of differences in prostate volume, overweight (OR = 1.41; 95%CI 1.01, 1.97), and obese status (OR = 1.59; 95%CI 1.09, 2.33) at the time of the original benign biopsy or TURP were associated with PCa incidence during follow‐up. Prostate volume did not significantly moderate the association between body‐size and PCa, however it did act as an inverse confounder; adjustment for prostate volume increased the effect size for overweight by 22% (adjusted OR = 1.52; 95%CI 1.08, 2.14) and for obese status by 23% (adjusted OR = 1.77; 95%CI 1.20, 2.62). Larger prostate volume at the time of the original benign biopsy or TURP was inversely associated with PCa incidence during follow‐up (OR = 0.92 per 10 cc difference in volume; 95%CI 0.88, 0.97). In analyses that stratified case‐control pairs by tumor aggressiveness of the case, prostate volume acted as an inverse confounder in analyses of non‐aggressive PCa but not in analyses of aggressive PCa.CONCLUSIONSIn studies of obesity and PCa, differences in prostate volume cause a bias toward the null, particularly in analyses of non‐aggressive PCa. A pervasive underestimation of the association between obesity and overall PCa risk may exist in the literature.
Mesoscale simulations of atmospheric CO2 variations using a high‐resolution model system with process‐based CO2 fluxes
Authors: Uebel M. , Herbst M. , Bott A. 
Published: March 2017

A new coupled high‐resolution biosphere–atmosphere model (TerrSysMP‐CO2) is applied to simulate mesoscale and diurnal variations of atmospheric CO2 mixing ratios. The model is characterized by process‐based parametrization calculating atmospheric dynamics and biogenic processes considering the prognostically varying CO2 content at the surface. An advanced parametrization of soil respiration is used distinguishing between heterotrophic and autotrophic respiration and explicitly considering the effect of varying soil moisture. In addition to biogenic CO2 fluxes, high‐resolution anthropogenic emissions are included in the simulations.The model performance is verified with eddy‐covariance fluxes and meteorological and CO2 concentration measurements at various heights of a tower. It is found that a correct representation of turbulent mixing is most critical for a precise prediction of near‐surface CO2 mixing ratios and respective vertical gradients. High‐resolution simulations were performed for a region with complex terrain, heterogeneous land use and densely populated areas. The relative influence of diverse land use, orography as well as of synoptic and mesoscale transport on the spatio‐temporal CO2 distribution is analyzed. The results indicate that, in regions with hilly terrain at night and in the morning, the CO2 patterns are strongly influenced by terrain‐induced local circulations. Moreover, in densely populated regions, fossil fuel emissions are an important source of atmospheric CO2. Finally, the simulated canopy fluxes and atmospheric conditions, calculated using two different crop physiological parameter sets, are compared.
Control design for discrete‐time bilinear systems using the scalarized Schur complement
Authors: Vatani M. , Hovd M. , Olaru S. 
Published: March 2017

SummaryIn this paper, controller design for discrete‐time bilinear systems is investigated by using sum of squares programming methods and quadratic Lyapunov functions. The class of rational polynomial controllers is considered, and necessary conditions on the degree of controller polynomials for quadratic stability are derived. Next, a scalarized version of the Schur complement is proposed. For controller design, the Lyapunov difference inequality is converted to a sum of squares problem, and an optimization problem is proposed to design a controller, which maximizes the region of quadratic stability of the bilinear system. Input constraints can also be accounted for. Copyright © 2017 John Wiley & Sons, Ltd.
Regio‐Selective C−H Halogenation of 8‐Amido‐Quinolines under Transition Metal Free Conditions
Authors: Sen Chiranjit , Sahoo Tapan , Ghosh Subhash Chandra 
Published: March 2017

AbstractA transition metal free highly regioselective remote C−H halogenation has been developed. Oxidative halogenation (Cl, Br, I) of C5‐H of 8‐amido quinolone with inexpensive potassium persulfate as an oxidant and cheap halogenating agents like N‐halosuccinimide (NXS) or tetrabutylammonium halides (TBAX) were employed. Two reaction conditions were developed and in both routes have advantages such as C5‐selectivity, high to excellent yields (up to 98 %) and broad substrate scope. The reaction also carried out in water, open to air condition.
Application of Drainage Basin Morphotectonic Analysis for Assessment of Tectonic Activities over Two Regional Structures of the Northeast India
Authors: Sharma Sangeeta , Sarma Jogendra Nath 
Published: March 2017

ABSTRACT
The analysis of drainage basin morphotectonic indices is applied in assessment of the influence of tectonic activity on thirteen selected drainage basins of the streams having linear courses and flowing over two very prominent regional structures of northeast India, viz. the Belt of Schuppen and the Dauki fault. Such analysis has been made in order to assess the influence of tectonic activity of these structures on the morphology of the drainage basins of those streams. The different morphotectonic indices considered are: Basin elongation ratio, hypsometric integral, steepness index and profile concavity, drainage basin asymmetry, valley floor width to valley height ratio, longitudinal profiles, stream length gradient index and mountain front sinuosity. Results of the analysis of the morphotectonic indices of the drainage basins infer that morphology of both the streams and drainage basins have been influenced by the regional structures and the present tectonic status of these two structures varies from active to slightly active phase. No significant influence of lithology is seen in the distribution pattern of the anomalous knick points along the longitudinal profiles. The study also reveals that presently the state of tectonic activity is not uniform within the same regional structure and the Belt of Schuppen is relatively more active as compared to the Dauki fault.
Sagediopsis bayozturkiisp. nov. on the lichenAcarospora macrocyclosfrom Antarctica with a key to the known species of the genus (Ascomycota, Adelococcaceae)
Authors: Halıcı Mehmet Gökhan , Güllü Mithat , Parnikoza Ivan 
Published: March 2017

ABSTRACTSagediopsis bayozturkii, a lichenicolous fungus growing on Antarctic endemic speciesAcarospora macrocyclos, is described as new to science from three collections made at 65° south in the Argentine Islands (Graham Land, maritime Antarctica). The fungus has a distinct internal apical beak in the ascus and ellipsoid three-septate ascospores; therefore, it is the member ofSagediopsissubgenusHawksworthiella. Morphologically and anatomicallyS. bayozturkiiis most similar toS. campsterianaandS. pertusariicola, which are confined to the lichen hostsOchrolechiaspp. andPertusariaspp., respectively. In addition to having different hosts,S. bayozturkiidiffers from these two species by having smaller ascomata and shorter ascospores. Its similarities to other species of the genus are discussed, and an artificial key based on the published descriptions of the ten species now known in the genusSagediopsisis presented.
‘Olde worlde’ urban? Reconstructing historic urban environments at exhibitions, 1884–1908
Authors: HILL KATE 
Published: March 2017

ABSTRACT:From 1884 until the Franco-British Exhibition in 1908, international and national exhibitions had a fad for including reconstructed historic urban streets in their attractions. This article investigates the meaning of such forms of urban heritage in the light of modernizing cities. It shows that ideas about historical authenticity were complex, and traces this to the ways in which staff and employees, and also the big crowds at the displays, co-produced this meaning. It suggests that visitors particularly constructed meaning through haptic and emotional encounters with the past, providing evidence of the development of new memory practices for modernity.
Realizing Haldane model in Fe-based honeycomb ferromagnetic insulators
Authors: Kim Heung-Sik , Kee Hae-Young 
Published: March 2017

AbstractThe topological Haldane model on a honeycomb lattice is a prototype of systems hosting topological phases of matter without external fields. It is the simplest model exhibiting the quantum Hall effect without Landau levels, which motivated theoretical and experimental explorations of topological insulators and superconductors. Despite its simplicity, its realization in condensed matter systems has been elusive due to a seemingly difficult condition of spinless fermions with sublattice-dependent magnetic flux terms. While there have been theoretical proposals including elaborate atomic-scale engineering, identifying candidate topological Haldane model materials has not been successful, and the first experimental realization was recently made in ultracold atoms. Here, we suggest that a series of Fe-based honeycomb ferromagnetic insulators, AFe2(PO4)2 (A=Ba, Cs, K, La) possess Chern bands described by the topological Haldane model. How to detect the quantum anomalous Hall effect is also discussed.
Comprehensive definition of human immunodominant CD8 antigens in tuberculosis
Authors: Lewinsohn Deborah A. , Swarbrick Gwendolyn M. , Park Byung , Cansler Meghan E. , Null Megan D. , Toren Katelynne G. , Baseke Joy , Zalwango Sarah , Mayanja-Kizza Harriet , Malone LaShaunda L. , Nyendak Melissa , Wu Guanming , Guinn Kristi , McWeeney Shannon , Mori Tomi , Chervenak Keith A. , Sherman David R. , Boom W. Henry , Lewinsohn David M. 
Published: March 2017

AbstractDespite widespread use of the Bacillus Calmette-Guerin vaccine, tuberculosis, caused by infection with Mycobacterium tuberculosis, remains a leading cause of morbidity and mortality worldwide. As CD8+ T cells are critical to tuberculosis host defense and a phase 2b vaccine trial of modified vaccinia Ankara expressing Ag85a that failed to demonstrate efficacy, also failed to induce a CD8+ T cell response, an effective tuberculosis vaccine may need to induce CD8+ T cells. However, little is known about CD8, as compared to CD4, antigens in tuberculosis. Herein, we report the results of the first ever HLA allele independent genome-wide CD8 antigen discovery program. Using CD8+ T cells derived from humans with latent tuberculosis infection or tuberculosis and an interferon-γ ELISPOT assay, we screened a synthetic peptide library representing 10% of the Mycobacterium tuberculosis proteome, selected to be enriched for Mycobacterium tuberculosis antigens. We defined a set of immunodominant CD8 antigens including part or all of 74 Mycobacterium tuberculosis proteins, only 16 of which are previously known CD8 antigens. Immunogenicity was associated with the degree of expression of mRNA and protein. Immunodominant antigens were enriched in cell wall proteins with preferential recognition of Esx protein family members, and within proteins comprising the Mycobacterium tuberculosis secretome. A validation study of immunodominant antigens demonstrated that these antigens were strongly recognized in Mycobacterium tuberculosis-infected individuals from a tuberculosis endemic region in Africa. The tuberculosis vaccine field will likely benefit from this greatly increased known repertoire of CD8 immunodominant antigens and definition of properties of Mycobacterium tuberculosis proteins important for CD8 antigenicity.
Influences of surface treatments with abrasive paper and sand-blasting on surface morphology, hydrophilicity, mineralization and osteoblasts behaviors of n-CS/PK composite
Authors: Tang Xiaoming , Huang Kai , Dai Jian , Wu Zhaoying , Cai Liang , Yang Lili , Wei Jie , Sun Hailang 
Published: March 2017

AbstractThe surfaces of nano-calcium silicate (n-CS)/polyetheretherketone (PK) composites were treated with abrasive paper and sand-blasting, and the surfaces performances of the as-treated composites were studied. The results showed that the surface roughness, hydrophilicity and mineralization of the simulated body fluid (SBF) of the composites surfaces were significantly improved, and the properties of the composites treated by with sand-blasting were better than those treated with abrasive paper. Moreover, the treated composites significantly promoted osteoblasts responses, such as cell attachment, spreading, proliferation and alkaline phosphatase (ALP) activity, compared to un-treated composites, and the cellular responses to the composites treated with sand-blasting were better than those treated with abrasive paper. The results suggested that surface treatment with sand-blasting was an effective method to greatly improve the surface bioperformances of the n-CS/PK composite, and this treated composite with improved bioactivity and cytocompatibility might be a promising implant material for orthopedic applications.