bluuebunny/crossref_metadata_2025_split huggingface dataset:
Three New Bisabolocurcumin Ethers from the Rhizomes of Curcuma longa L.
Authors: Xiao Yun‐Chuan , Lei Jun , Liu Miao , Yu Min , Ran Jian , Xie Jing , Li Wei , Huang Jing 
Published: February 2012

AbstractThree new bisabolocurcumin ethers, named demethoxybisabolocurcumin ether (1), bisabolocurcumin ether (2), and didemethoxybisabolocurcumin ether (3), along with two known compounds, 4 and 5, were isolated from the AcOEt extract of the rhizomes of Curcuma longa L. Their structures were established by the analysis of NMR and MS data. The new compounds 1–3, which possess a new 1,7‐diarylheptanoid skeleton linked with a bisabolone‐type sesquiterpene substructure by a CO bond, were found for the first time in a natural source.
Yalongenes A and B, Two New Cembranoids with Cytoprotective Effects from the Hainan Soft Coral Sarcophyton trocheliophorumMarenzeller
Authors: Yao Li‐Gong , Zhang Hai‐Yan , Liang Lin‐Fu , Guo Xian‐Jun , Mao Shui‐Chun , Guo Yue‐Wei 
Published: February 2012

AbstractTwo new cembranoids, yalongenes A (1) and B (2), were isolated from the South China Sea soft coral Sarcophyton trocheliophorum Marenzeller. Their structures were elucidated by detailed spectroscopic analysis (IR, MS, and NMR) and by comparison with a related model compound. Yalongenes 1 and 2 were evaluated for their cytoprotective effects on SH‐SY5Y cell injury induced by H2O2 in vitro, and the result showed that only compound 1 had a significant cytoprotective activity at the concentration of 1 μM.
Four New Cuparene‐Type Sesquiterpenes from Flammulina velutipes
Authors: Wang Ya‐Qi , Bao Li , Yang Xiao‐Li , Dai Huan‐Qin , Guo Hui , Yao Xin‐Sheng , Zhang Li‐Xin , Liu Hong‐Wei 
Published: February 2012

AbstractFlamvelutpenoids A–D (1–4), four new cuparene‐type sesquiterpenes, were isolated from the solid culture of Flammulina velutipes. Their structures were elucidated by NMR experiments. The absolute configurations of 1 and 2 were assigned via the circular dichroism data of the [Rh2(OCOCF3)4] complex, whereas that of C(3) of 3 was determined by applying the octant rule for the α,β‐unsaturated ketone moiety. Compounds 1–4 showed weak antibacterial activity against Escherichia coli, Bacillus subtilis, and methicillin‐resistant Staphylococcus aureus with MIC values larger than 100 μM.
One‐Pot Synthesis of 4‐(2,3‐Dihydro‐2‐hydroxy‐1,3‐dioxo‐1H‐inden‐2‐yl)‐Substituted 1‐Aryl‐1H‐pyrazole‐3‐carboxylates via a Tandem Three‐Component Reaction
Authors: Alizadeh Abdolali , Zarei Ameneh , Rezvanian Atieh 
Published: February 2012

AbstractThe hitherto unreported, highly functionalized 1H‐pyrazole‐3‐carboxylates 3 have been synthesized in good yields via a one‐pot three‐component domino reaction of phenylhydrazines, dialkyl acetylenedicarboxylates, and ninhydrin under mild conditions for the first time. No co‐catalyst or activator is required for this multicomponent reaction, and the reaction is, from an experimental point of view, simple to perform (Scheme 1). The structures of compounds 3 were corroborated spectroscopically (IR, 1H‐ and 13C‐NMR, and EI‐MS) and by elemental analyses. A plausible mechanism for this type of cyclization/addition reaction is proposed (Scheme 2).
Highly Conjugated Ergostane‐Type Steroids and Aranotin‐Type Diketopiperazines from the Fungus Aspergillus terreus BCC 4651
Authors: Haritakun Rachada , Rachtawee Pranee , Komwijit Somjit , Nithithanasilp Sutichai , Isaka Masahiko 
Published: February 2012

AbstractTwo new ergostane derivatives, 12β,15α,25,26‐tetrahydroxyergosta‐4,6,8(14),22‐tetraen‐3‐one (1) and 12β,15α,25,28‐tetrahydroxyergosta‐4,6,8(14),22‐tetraen‐3‐one (2), and a new aranotin‐type diketopiperazine, bisdethiobis(methylsulfanyl)apoaranotin (3), were isolated from the fungus Aspergillus terreus BCC 4651. The structures of the new compounds were elucidated by means of NMR spectroscopic and MS analyses.
The role of PGC‐1 coactivators in aging skeletal muscle and heart
Authors: Dillon Lloye M. , Rebelo Adriana P. , Moraes Carlos T. 
Published: February 2012

AbstractAging is the progressive decline in cellular, tissue, and organ function. This complex process often manifests as loss of muscular strength, cardiovascular function, and cognitive ability. Mitochondrial dysfunction and decreased mitochondrial biogenesis are believed to participate in metabolic abnormalities and loss of organ function, which will eventually contribute to aging and decreased lifespan. In this review, we discuss what is currently known about mitochondrial dysfunction in the aging skeletal muscle and heart. We focused our discussion on the role of PGC‐1 coactivators in the regulation of mitochondrial biogenesis and function and possible therapeutic benefits of increased mitochondrial biogenesis in compensating for mitochondrial dysfunction and circumventing aging and aging‐related diseases. © 2012 IUBMB IUBMB Life, 2012
A Theory, Philosophy, and Practice for the Employment Counselor
Authors: LAWRENCE RICHARD E. 
Published: February 2012

Employment counselors have many pressures brought on them by various publics. Many of these forces make it difficult for them to engage in counseling with their clients. Although there are varying definitions of counseling, many focus on dynamic problems such as defining roles and making decisions.There is a need for theory in the practice of counseling, and a specific approach described is based on existential philosophy. Directing attention in counseling to the meaning of life and to what each person may do to provide answers to this question is the main point in this existential approach.
The role of receptor for advanced glycation end products (RAGE) in neuronal differentiation
Authors: Kim Joanne , Wan Carthur K. , J. O'Carroll Simon , Shaikh Shamim B. , Nicholson Louise F.B. 
Published: February 2012

AbstractThe receptor for advanced glycation end products (RAGE) is a multiligand receptor protein thought to play an important role in neuronal differentiation. RAGE can bind a number of ligands and activate a variety of signalling pathways that lead to diverse downstream effects. Amphoterin and S100B are endogenous ligands, the interaction of which with RAGE is known to be involved in defined physiological processes. The present study investigated the spatiotemporal pattern of the expression for RAGE and its ligands, amphoterin and S100B, during neuronal differentiation of NT2/D1 cells. In this study, all three proteins were shown to increase with progression of neuronal differentiation as determined by Western blotting, raising the possibility that both amphoterin and S100B may interact with RAGE and have important functions during the process of cell differentiation. Moreover, blocking the activation of RAGE with neutralizing antibody in the presence of retinoic acid disrupted the progression of normal neuronal differentiation. Immunocytochemistry (ICC) studies showed that amphoterin partially colocalized with RAGE within differentiating NT2 cells, whereas S100B showed a high degree of colocalization. This result suggests that S100B is more likely to be the principal ligand for RAGE during the differentiation process and that RAGE and amphoterin might have both independent and combined roles. Moreover, RAGE was expressed only in cells that were committed to a neuronal phenotype, suggesting direct involvement of RAGE in mediating cellular changes within differentiating neuronal cells. Further detailed studies are now required to characterize fully the role of RAGE during the neuronal differentiation period. © 2012 Wiley Peridicals, Inc.
A polyhedral beam‐tracing method for modeling ultrawideband indoor radio propagation
Authors: Barros Fabrício J. B. , Costa Emanoel , Siqueira Gláucio L. , Bergmann José Ricardo 
Published: February 2012

AbstractA three‐dimensional convex polyhedral beam‐tracing method for modeling ultrawideband indoor radio channels is presented.The model enables a fast and unambiguous generation of all propagation paths between the transmitter and the receiver over an 850‐MHz bandwidth. To validate the model, its results are compared with measurements. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:904–909, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26670
An analytical technique to fast evaluate mutual coupling integrals in spectral domain analysis of multilayered coplanar coupled striplines
Authors: Lucido M. 
Published: February 2012

AbstractThe analysis of propagation in multilayered coplanar coupled striplines by means of Galerkin's method in the spectral domain with expansion functions factorizing the edge behavior of the surface current density on each strip leads to the evaluation of slowly converging integrals. In this work a new analytical technique to express the mutual coupling integrals as rapidly converging series is presented. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1035–1039, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26674
Novel compact low temperature cofired ceramic ultrawideband SIR bandpass filter using different coupling schemes
Authors: Kewei Qian , Chanjuan Fan 
Published: February 2012

AbstractA new ultrawideband quarter‐wavelength SIR filter using different coupling schemes is presented. In the proposed filter, weak coupling coefficient is realized using conventional edge‐coupled structure, while great coefficient is obtained by applying direct magnetic coupling between two resonators or overlapping resonators in different low temperature cofired ceramic layers. Based on the proposed strong coupling structures, the bandwidth is extended, while the size is largely reduced. Besides, spur lines are adopted to improve the stopband characteristic. In this article, a four‐pole filter of dimension 0.11λg × 0.18λg, with a 3‐dB bandwidth of 74.5% and a wide stopband up to 12 GHz, is designed and fabricated. Good agreement between measured and simulated results is observed. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:967–970, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26679
Investigation of ultra‐wideband electromagnetic radiation based on SI‐GaAs photoconductive switches
Authors: Wei Shi , Weili Ji , Wanli Jia 
Published: February 2012

AbstractA new ultra‐wideband electromagnetic pulse generating based on the photoconductive semiconductor switches (PCSS) is presented. Semi‐insulated Gallium Arsenide is used to develop the PCSS for an ultrashort electromagnetic pulse source. The construction and the work principle of PCSS are illustrated in this paper. The experimental results of ultra‐wide‐band radiation with DC biased GaAs photoconductive semiconductor switch triggered by nanosecond (ns), picosecond (ps), femtosecond (fs) laser pulse, are reported respectively. The radiations of the PCSS triggered by the ns laser pulse, the ps laser pulse and fs laser pulse series illustrate that the electromagnetic pulses would have high repetition of more than 80 MHz and frequency bandwidth of DC‐7.6 GHz. The radiation characteristic of the ultrafast electrical pulse generated by PCSS is analyzed. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:900–904, 2012;, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26683
Microstrip dual‐band bandstop filter to suppress DGS, DMB, GPS, UTMTS, WCDMA, WIBRO, and WLAN bands
Authors: Faraji Tayeb , Hazeri Ali Reza 
Published: February 2012

AbstractIn this article, a new microstrip dual‐band bandstop filter (DSBF) is proposed. By combining coupled three‐line microstrip structures, single transmission lines, and coupled open‐end stubs, a DSBF with high‐rejection levels and sharp frequency responses in the stopbands is found. The proposed DSBF is optimized to suppress DGS, DMB, GPS, UTMTS, WCDMA, WIBRO, and WLAN bands. The insertion loss in the two stopbands is >20 dB from 1.52 to 2.77 GHz and from 4.88 to 5.8 GHz. Four transmission zeros are realized at 1.7, 2.7, 5.1, and 5.8 GHz. Moreover, return loss of passband between the first and second stopbands is excellent. The proposed DSBF is simulated (by ADS simulator) and fabricated on a substrate with a thickness of 0.635 mm and a relative dielectric of 10.2. Here is an excellent agreement between simulation and measurement results. The overall size of the DSBF is 17.538 × 14.4 mm2. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:854–856, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26684
All‐optical coherence‐free microwave filter based on remodulation scheme utilizing different intensity modulators
Authors: Zhu K. , Ou H. 
Published: February 2012

AbstractA simple all‐optical coherence‐free microwave notch filter is proposed and experimentally demonstrated. The filter is based on remodulation scheme using a narrow‐linewidth laser, an intensity electro‐optic modulator, and a Sagnac fiber loop reflector to eliminate the coherent limitation and phase‐induced intensity noise. Both Mach‐Zehnder modulator and electroabsorption modulator are used in the microwave photonic filtering system, and different frequency responses are observed, respectively, in the experiment. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:993–995, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26687
Design of a vertically stacked reconfigurable dipole antenna for a base station
Authors: Hong Ic‐Pyo , Jung Young‐Jin , Eom Soon‐Young 
Published: February 2012

AbstractA new design for a frequency reconfigurable antenna for a base station is presented with the use of a vertically stacked dipole structure and switches based on PIN diodes.The proposed antenna provides three frequency reconfigurations including Cellular (824–849 MHz), PCS, WCDMA, Wibro, WLAN (1700–2500 MHz), and WiMAX (3300–3600 MHz). Measured results on return losses, radiation patterns, and gains are provided, and these show good agreement with simulations. The proposed antenna in this article can be applied for the small base station or repeaters of future mobile wireless communications because of the small size and high‐gain features. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:964–967, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26688
Fiber bragg grating‐based load sensor without temperature dependence
Authors: Hu Limin , Dong Xinyong , Zhang Shuqin , Jin Shangzhong , Wang Yunpeng , Chan Chi Chiu , Shum Ping 
Published: February 2012

AbstractA novel load sensor has been proposed and demonstrated by embedding a fiber Bragg grating (FBG) into a tapered cylindrical polymer rod. Load‐induced nonuniform strain field changes the bandwidth, and hence, the reflected optical power of the FBG. Temperature‐insensitive measurement of load has been realized by measuring the reflected optical power with only a low‐cost optical power meter. Load measurement sensitivity of 5.0 nW/N has been experimentally achieved within a range up to 1800 N. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:930–933, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26695
Analysis of transient wave propagation in an arbitrary frequency‐dispersive media using the associated laguerre functions in the FDTD‐MOD method
Authors: Jung Baek Ho , Mei Zicong , Sarkar Tapan Kumar , Salazar‐Palma Magdalena 
Published: February 2012

AbstractIn this work, we present a marching‐on‐in‐degree (MOD) method in a finite difference time‐domain (FDTD) framework for analyzing transient electromagnetic responses in a general dispersive media.The two issues related to the finite difference approximation of the time derivatives and the time‐consuming convolution operations are handled analytically using the properties of the associated Laguerre functions. The basic idea here is that we fit the transient nature of the fields, the flux densities, the permittivity and the permeability with a finite sum of orthogonal associated Laguerre functions. Through this novel approach, not only the time variable can be decoupled analytically from the temporal variations but also the final computational form of the equations is transformed from FDTD to a FD formulation through a Galerkin testing. We also propose a second MOD formulation based on the Helmholtz wave equation. Representative numerical examples are presented for transient wave propagation in general Debye, Drude, or a Lorentz dispersive medium. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:925–930, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26696
A low‐power 5‐GHz CMOS RF receiver for WLAN applications
Authors: Cha Minyeon , Kwon Ickjin 
Published: February 2012

AbstractA low‐power 5‐GHz IEEE 802.11a CMOS RF receiver for wireless local area network is designed.For low‐power dissipation, a dual conversion current‐driven passive mixer is used in an RF front‐end. An optimum allocation of alternated low‐pass filters and amplifiers in a baseband analog chain is also performed. The receiver is fabricated in 0.13 μm 1‐poly 6‐metal CMOS technology. The fully integrated receiver achieves 90.5 dB maximum gain, 7.1 dB noise figure, and −20 dBm input‐referred third‐order intercept point. The chip area is 3.25 mm2 and it consumes a power of 40.8 mW from a supply voltage of 1.2 V. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:842–847, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26700
High efficiency power combining technique for distributed amplifier of different stages
Authors: Mung Steve W. Y. , Hung Kwok Man 
Published: February 2012

AbstractA high efficiency power combining technique based on distributed amplifier's (DA) topology is proposed to allow efficient distributed combining of FETs' output power without the use of multiway power combiners. The proposed topology uses a quarter‐wave short‐circuit stub or open circuit to replace the drain line lossy dummy load. This topology is able to achieve power equalization among the FETs at microwave frequencies. This design method ensures that optimum loadlines are achieved for all FETs, and the efficiency obtained is comparable to a conventional single‐transistor class‐A power amplifier using the same FET type. Different stages of DA have different optimum loadline resistances for power combining. This optimum characteristic resistance of the drain output transmission line presented here obtains the power‐matched condition for all FETs. It is demonstrated at 2 GHz with 1‐stage, 2‐stage, and 3‐stage DAs. Experimental results show that the power‐added efficiency of these three DAs is greater than 35% at the 1‐dB gain compression point (P1dB). The 3‐stage DA demonstrates an output power of 27.4 dBm at P1dB with power combining efficiency around 90%. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1056–1059, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26703
Analytical solution for the design of planar electromagnetic bandgap structures with spurious‐free frequency response
Authors: Arnedo Israel , Chudzik Magdalena , Schwartz Joshua D. , Arregui Ivan , Lujambio Aintzane , Teberio Fernando , Benito David , Laso Miguel Ángel G. , Plant David V. , Azaña Jose , Lopetegi Txema 
Published: February 2012

AbstractIn this article, an analytical solution is obtained for the design of electromagnetic bandgap (EBG) structures that feature a single stopband without the spurious rejected bands present in the conventional EBG devices at the harmonics of the design frequency.The proposed technique is applied for the design of microwave filters intended for broadband applications, where closed formulas are found both in two‐port lines and in four‐port coupled lines obtaining very good results. The implementation of the EBG structure in coupled lines allows for the redirection of the reflected signal to the coupled port producing a device with input port matched at all frequencies. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:956–960, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26709
BIAS‐free analog predistorters with L‐TYPE attenuator for RF power amplifiers
Authors: Jhang Jyun‐Yuan , Hsue Thomas , Jang Sheng‐Lyang 
Published: February 2012

AbstractParallel forward‐reverse Schottky‐diode paths and a L‐type attenuator form a bias‐free predistorter that effectively reduces the intermodulation distortion of an RF power amplifier.The predistorter exhibits a constant insertion loss at the low input power and its insertion loss decreases when the input power increases. The resistor in the L‐type attenuator serves as the transmission path when the input power is small. When the input power is large, on the other hand, the diode paths are activated to serve as the linearization vehicle for the predistorter. An improvement of extended operating power level up to 5 dB with the limit of −30 dBm adjacent‐channel leakage power is obtained for a 5‐watt amplifier at 1.9 GHz. Measured results are presented to illustrate the effectiveness of the predistorter. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:920–923, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26712
A complementary cross‐coupled quadrature VCO using ring‐inductor coupling method
Authors: Jang Sheng‐Lyang , Lin San‐Sheng , Chang Chia‐Wei , Hsu Shih‐Hsiang 
Published: February 2012

AbstractA high‐performance quadrature voltage‐controlled oscillator (QVCO) with ring inductor is studied. The QVCO uses a closed‐loop ring inductor and is composed of two complementary negative transconductance cells to replenish the energy loss due to the resistive LC resonator and is implemented in a standard TSMC 90 nm 1P9M CMOS technology. This QVCO operates between 7.05 and 8.15 GHz. The measured phase noise of the VCO operating at 8.15 GHz is −119.98 dBc/Hz at 1‐MHz offset while the QVCO draws 4.2 mA and 3.57 mW consumption from a supply voltage of 0.85 V. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:839–842, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26714
Simple CAD formula for the microstrip line on L‐SIAD
Authors: Tang Wanchun , Wang Xiaoke , Liu Xiaoming , Chow Y.Leonard 
Published: February 2012

AbstractThis article presents a simple CAD formula for the microstrip line on localized substrate integrated artificial dielectric (L‐SIAD) by synthetic asymptote. For L‐SIAD, there is a metal post array embedded in the substrate and connected to the bottom ground plane. All the metal posts are right under (but not connected to) the microstrip line. The simple CAD formula is accurate with average error less than 2% compared with numerical results, and gives good physical insight. Finally, this formula is applied to the design of an L‐SIAD microstrip line. The simulations and measurements show good agreements. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:856–858, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26720
Backward wave mode interaction impedance at THz frequencies for corrugated waveguide
Authors: Mineo Mauro , Paoloni Claudio 
Published: February 2012

AbstractA novel analytical expression to compute the interaction impedance of corrugated rectangular waveguide slow‐wave structure, for backward wave regime is proposed.The remarkable agreement of the analytical model with 3D electromagnetic simulations makes the proposed expression of practical usefulness for backward wave oscillator design up to THz frequencies. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:837–839, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26721