bluuebunny/crossref_metadata_2025_split huggingface dataset:
Discrete calcium phosphate nanocrystalline deposition enhances osteoconduction on titanium‐based implant surfaces
Authors: Mendes Vanessa C. , Moineddin Rahim , Davies John E. 
Published: June 2008

AbstractWe sought to assess the ability of nanotopographically complex titanium surfaces to accelerate osteoconduction. For this, 130 miniature bone ingrowth chambers (called “T plants”), fabricated from either commercially pure titanium (cpTi) or titanium alloy (Ti6Al4V or Ti64), with microtopographically complex surfaces were used in the study, of which 50 were further modified by the discrete crystalline deposition (DCD) of calcium phosphate (CAP) nanoparticles that superimposed a nanotopographic complexity on each implant surface. Thus, four experimental groups were generated (cpTi, cpTi‐DCD, Ti64, and Ti64‐DCD), and the Tplants were implanted bilaterally in the femora of Wistar rats for 9 days. After harvesting, the femora were trimmed, and multiple‐mounted samples were embedded in PMMA. The blocks produced were ground and block faces observed by back‐scattering electron imaging (BSEI) at different planes through the chambers. Osteoconduction was assessed, as a function of bone‐implant contact, on a total of 1087 BSEI micrographs and submitted to rigorous statistical analyses. Our results showed both the important effects of anatomic location on bone ingrowth and the significant increase in osteoconduction (p < 0.001) as a function of the enhanced surface nanotopography obtained by the CAP nanocrystals. © 2008 Wiley Periodicals, Inc. J Biomed Mater Res, 2009
Gelatin nanofibrous membrane fabricated by electrospinning of aqueous gelatin solution for guided tissue regeneration
Authors: Zhang Shen , Huang Yaqin , Yang Xiaoping , Mei Fang , Ma Qi , Chen Guoqiang , Ryu Seungkon , Deng Xuliang 
Published: June 2008

AbstractThe electrospinning of gelatin aqueous solution was successfully carried out by elevating the spinning temperature. The effects of spinning temperature and solution concentration were investigated on the morphology of gelatin nanofibers in the current study. To improve the stability and mechanical properties in moist state, the gelatin nanofibrous membrane was chemically crosslinked by 1‐ethyl‐3‐dimethyl‐aminopropyl carbodiimide hydrochloride and N‐hydroxyl succinimide. The concentration of crosslinker was optimized by measuring the swelling degree and weight loss. Nanofibrous structure of the membrane was retained after lyophilization, although the fibers were curled and conglutinated. Tensile test revealed that the hydrated membrane becomes pliable and provides predetermined mechanical properties. Periodontal ligament cells cultured on the membrane in vitro exhibited good cell attachment, growth, and proliferation. Gelatin nanofibrous membrane can be one of promising biomaterials for the regeneration of damaged periodontal tissues. © 2008 Wiley Periodicals, Inc. J Biomed Mater Res, 2009
Cytotoxic action mode of a novel porphyrin derivative isolated from harmful red tide dinoflagellate Heterocapsa circularisquama
Authors: Kim Daekyung , Miyazaki Yousuke , Nakashima Takuji , Iwashita Takashi , Fujita Tsuyoshi , Yamaguchi Kenichi , Choi Kwang‐Sik , Oda Tatsuya 
Published: June 2008

AbstractHeterocapsa circularisquama is known to cause lethal effect on bivalves, but toxic effect on fish has not been reported yet. Recently, we have found that H. circularisquama has potent light‐dependent hemolytic toxins. Based on the chemical structural analysis, one of the hemolytic toxins named H2‐a was found to be a novel porphyrin derivative with similar structure to pyropheophorbide a methyl ester (PME), a well‐known photoactive hemolytic agent (Miyazaki et al., Aquatic Toxicol. 2005;73:382‐‐393). To clarify the cytotoxic action mode of H2‐a, we examined the effects of H2‐a on HeLa cells in comparison with PME. The cytotoxicities of both reagents were strictly light dependent, and no significant cytotoxic effects including cellular morphological changes were induced without light illumination. The dose response curves revealed that H2‐a showed stronger cytotoxicity to HeLa cells than PME. Fluorescence microscopic observation suggested that H2‐a tends to accumulate in the plasma membrane, whereas PME seems to distribute entire cytoplasm. Although PME induced typical apoptotic nuclear morphological changes and DNA fragmentation in HeLa cells, no such apoptosis‐inducing ability of H2‐a was observed. Among the radical scavengers, histidine significantly inhibited the cytotoxic activity of H2‐a, suggesting the involvement of singlet oxygen in the cytotoxicity. These results suggest that the cytotoxic mechanism of H2‐a is necrotic rather than apoptosis differing from PME, even though these are structurally quite similar to each other. The relatively high affinity of H2‐a to the plasma membrane might result in the potent and quick cytotoxicity without induction of apoptotic signal transduction. © 2008 Wiley Periodicals, Inc. J Biochem Mol Toxicol 22:158–165, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/jbt.20216
Channa punctata brain metallothionein is a potent scavenger of superoxide radicals and prevents hydroxyl radical‐induced in vitro DNA damage
Authors: Atif Fahim , Kaur Manpreet , Ansari Rizwan A. , Raisuddin Sheikh 
Published: June 2008

AbstractMammalian brain metallothioneins (MTs) have been shown to scavenge free radicals. However, a similar role for fish brain MT has not been established yet. Previously, we have reported that MT from the liver of a freshwater fish, Channa punctata Bloch, had free‐radical‐scavenging activity in vitro. In this study, we report on the induction of MT in brain and other tissues of C. punctata treated with a low concentration of zinc chloride. We partially purified MT (Zn‐MT)‐rich fraction from the brain and studied its free‐radical‐scavenging and DNA damage attenuating effects. Zinc exposure showed significant MT induction in brain, gill, kidney, and liver. C. punctata brain MT efficiently scavenged superoxide radicals and also attenuated hydroxyl radical‐mediated DNA damage. These findings suggest that fish brain MT has a free‐radical‐scavenging activity, and its expression may be regulated in response to stress and chemical exposure. C. punctata has been identified as a potent biomarker fish species. It is suggested that this fish species may be a good model for the study of MTs with regard to their regulatory and biomarker functions. © 2008 Wiley Periodicals, Inc. J Biochem Mol Toxicol 22:202–208, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/jbt.20230
Possible impacts of anthropogenic and natural aerosols on Australian climate: a review
Authors: Rotstayn Leon D. , Keywood Melita D. , Forgan Bruce W. , Gabric Albert J. , Galbally Ian E. , Gras John L. , Luhar Ashok K. , McTainsh Grant H. , Mitchell Ross M. , Young Stuart A. 
Published: June 2008

AbstractA review is presented of the aerosol–climate interaction with specific focus on the Australian region. The uncertainties associated with this interaction are much larger than those associated with greenhouse gases or other forcing agents, and are currently a major obstacle in climate‐change research. However, new research suggests that aerosol effects are of comparable importance to greenhouse gases as a driver of recent climate trends in the Southern Hemisphere, including Australia. A significant new result from climate modelling is that anthropogenic aerosol over Asia affects meridional temperature gradients and atmospheric circulation, and may have caused an increase in rainfall over north‐western Australia. Global ocean circulation provides another mechanism whereby aerosol changes in the Northern Hemisphere can affect climate in the Southern Hemisphere, suggesting an urgent need for further targeted studies using coupled ocean‐atmosphere global climate models. To better model climate variability and climate change in the Australian region, more research is needed into the sources of aerosol and their precursors, their atmospheric distributions and transformations, and how to incorporate these processes robustly in global climate models (GCMs). The following priorities are suggested for further research in Australia linking aerosol observations and modelling: natural aerosol over the Southern Ocean, tropical biomass‐burning aerosol in Indonesia and Australia, secondary organic aerosol (SOA) from volatile organic compounds (VOCs), wind‐blown dust and modulation of rainfall by anthropogenic aerosol. Copyright © 2008 Royal Meteorological Society
An assessment of relationships between the Australian subtropical ridge, rainfall variability, and high‐latitude circulation patterns
Authors: Williams Allyson A. J. , Stone Roger C. 
Published: June 2008

AbstractThe monthly anomaly of the latitude of the subtropical ridge over eastern Australia (L) is a major regulator of synoptic‐scale influences on Australia's climate. Three datasets have been used to calculate L: observed Australia coastal mean sea level pressure (MSLP), Hadley and NCEP Reanalysis datasets. The choice of datasets used in this study appears to strongly influence results. Changes in the Southern Hemisphere Hadley cell and meridional circulation changes are associated with changes in L and it is shown that (1) L has statistically and physically significant relationships with seasonal rainfall in Australia; (2) the Antarctic Oscillation Index (AOI) has statistically significant relationships with Australian seasonal rainfall; and (3) L and Southern Annular Mode (SAM) are significantly related. Longer‐term latitudinal shifts in L are also discussed. Copyright © 2008 Royal Meteorological Society
Simple sample transfer technique by internally expanded desorptive flow for needle trap devices
Authors: Eom In‐Yong , Pawliszyn Janusz 
Published: June 2008

AbstractNeedle trap devices (NTDs) are improving in simplicity and usefulness for sampling volatile organic compounds (VOCs) since their first introduction in early 2000s. Three different sample transfer methods have been reported for NTDs to date. All methods use thermal desorption and simultaneously provide desorptive flow to transfer desorbed VOCs into a GC separation column. For NTDs having ‘side holes’, GC carrier gas enters a ‘side hole’ and passes through sorbent particles to carry desorbed VOCs, while for NTD not having a ‘side hole’, clean air as desorptive flow can be provided through a needle head by a air tight syringe to sweep out desorbed VOCs or water vapor has been reported recently to be used as desorptive flow. We report here a new simple sample transfer technique for NTDs, in which no side holes and an external desorptive flow are required. When an NTD enriched by a mixture of benzene, toluene, ethylbenzene, and xylene (BTEX) or n‐alkane mixture (C6–C15) is exposed to the hot zone of GC injector, the expanding air above the packed sorbent transfers the desorbed compounds from the sorbent to the GC column. This internal air expansion results in clean and sharp desorption profiles for BTEX and n‐alkane mixture with no carryover. The effect of desorption temperature, desorption time, and overhead volumes was studied. Decane having vapor pressure of ∼︁1 Torr at 20°C showed ∼︁1% carryover at the moderate thermal desorption condition (0.5 min at 250°C).
The use of an improved atmospheric correction algorithm for removing atmospheric effects from remotely sensed images using an atmosphere–surface simulation and meteorological data
Authors: Hadjimitsis D. G. , Clayton C. R. I. 
Published: June 2008

AbstractUnless effective corrections can be applied, satellite remote sensing data will remain modified by the absorption and scattering effects of the atmosphere through which the electromagnetic radiation must pass, between the Sun, the ground and the sensor. The true reflectance of the land will not be recoverable, and multi‐temporal datasets will not be comparable as a result of the variability of the atmosphere. This article presents a method of removing atmospheric effects from satellite remote sensing images for low‐reflectance areas, such as water, where the atmosphere accounts for the majority of the at‐satellite measured radiance in the visible bands. The method uses visibility observations to select a reference image for the area of interest. The reflectance of the dark target is calculated after atmospheric correction from the reference image, and is used in conjunction with Turner and Spencer's atmosphere–surface simulation (Turner and Spencer, 1972) and Forster's method (Forster, 1984), to correct the remainder of the images. The method is applied to three large water treatment reservoirs to the west of London. Copyright © 2008 Royal Meteorological Society
Erratum: Automatic calibration method for phased arrays with arbitrary aperture shape
Authors: Son Seong Ho , Jeon Soon Ik , Hwang Woonbong 
Published: June 2008

AbstractOriginally published Microwave Opt Technol Lett 50:1590–1592, 2008. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2481, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23627
Printed omnidirectional access‐point antenna for 2.4/5‐GHz WLAN operation
Authors: Su Saou‐Wen , Chou Jui‐Hung 
Published: June 2008

AbstractA new design of the printed omnidirectional antenna for applications in 2.4/5‐GHz dual‐WLAN‐band access points is proposed. The antenna consists of a conventional collinear antenna for 2.4 GHz operation and two U stubs for 5 GHz operation. The two U stubs are located near the points where the maximum currents at about 5.5 GHz occurring on the strips of the collinear antenna and arranged back‐to‐back in the same phase for achieving better antenna gain. Detailed analyses of the U stub on the impedance matching over the 5 GH band is presented. A prototype with good omnidirectional radiation across the 2.4/5‐GHz WLAN bands is demonstrated. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2403–2407, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23629
A 5‐GHz fully integrated low‐power wide‐tuning‐range CMOS LC VCO
Authors: Chen Chang‐Zhi , Fang Hao‐Yu , Lin Yo‐Sheng , Chen Chi‐Chen 
Published: June 2008

AbstractA 5‐GHz‐band monolithic LC differential voltage‐controlled oscillator (VCO) with low‐power consumption and wide‐tuning‐range was designed and implemented using a standard 0.18‐μm CMOS technology. Low‐power consumption is achieved by maximizing the equivalent parallel resistance of the LC tank, while wide‐tuning‐range is achieved by minimizing the summed parasitic capacitance of the differential inductor and the cross‐coupled PMOS transistors pair. The LC VCO achieves a wide‐tuning‐range of 14.1% (from 4.95 to 5.7 GHz) with a low‐power dissipation of 1.5 mW. The measured phase noise is −111.1 dBc/Hz at 1‐MHz offset. The corresponding figure‐of‐merit (FOM′) of the VCO is −166.8 dBc/Hz, which is comparable with, or even better than, those of the reported state‐of‐the‐art CMOS LC VCOs in 5‐GHz‐band. The chip area is only 630 × 730 μm2excluding the test pads. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2320–2332, 2008; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.23638
A Sierpinski fractal‐based dual‐mode bandpass filter
Authors: Weng Min‐Hang , Lee Der‐Sun , Yang Ru‐Yuan , Wu Hung‐Wei , Liu Chia‐Ling 
Published: June 2008

AbstractIn this letter, we propose a new microstrip dual mode bandpass filter (BPF) using a 3rd order Sierpinski fractal‐based resonator (SFR). The different order SFRs are generated from the conventional square patch by using an iterative Sierpinski generator method. In this article, a 3rd order SFR is used to design a high performance dual mode BPF due to its miniaturized property. By adding a perturbation element at the corner of the SFR, the dual mode frequency response can be found. A miniature and low insertion dual‐mode BPF centered at 2.4 GHz using the proposed 3rd SFR is designed, fabricated, and characterized to verify the design concept. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2287–2289, 2008; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.23641
Post‐CMOS compatibly micromachined high‐performance on‐chip air‐core solenoidal inductors
Authors: Gu Lei , Wu Zhengzheng , Li Xinxin 
Published: June 2008

AbstractThis article reports on‐chip micromachined solenoidal inductors with high radio‐frequency (RF) performance. The RF components can be either used in multi‐GHz telecommunication modules with a system in package scheme or monolithically integrated in RFICs with a post‐CMOS integration method. A trench SiO2‐refilling technique is used to shape the silicon cavity for accommodating the embedded inductor, and to mesh the substrate beneath the pads to suppress the substrate‐loss at the pads. Without de‐embedding needed, the tested inductors with 2.5–7 nH inductances achieve 33 to 13.5 peak‐Q factors at 11–3 GHz and self‐resonance frequencies of 18.0–7.5 GHz, respectively. Moreover, the inductors with the trench technique feature a high uniformity in RF‐performances, thereby, showing a promise for practical product applications. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2442–2446, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23646
Active‐inductor‐capacitor tank Colpitts injection‐locked frequency divider
Authors: Jang S.‐L. , Liu C.‐C. 
Published: June 2008

AbstractThis article presents a wide‐locking range injection‐locked frequency divider (ILFD), using a tunable active inductor (TAI), which is used to extend the locking range and to reduce die area. The CMOS ILFD is based on a new Colpitts voltage‐controlled oscillator (CVCO) with TAI‐C tank and was fabricated in the 0.18‐μm 1P6M CMOS technology. The ILFD is performed by adding injection MOSFETs between the differential outputs of the CVCO. At the supply voltage of 1.9 V, the free‐running ILFD tuning range is from 2.25 GHz to 1.26 GHz, whereas the tuning bias of active inductor is tuned from 0.88 V to 1.04 V. At the incident power of 0 dBm, the operation‐locking range is from the incident frequency 1.25–5.85 GHz. The phase noise of the ILFD can track with the injection source. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2376–2379, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23650
A transceiver module for automotive radar sensors using W‐band monolithic microwave‐integrated circuit one‐chip set
Authors: Kang Dong Min , Hong Ju Yeon , Yoon Hyung Sup , Lee Kyung Ho , Choi Ik Guen 
Published: June 2008

AbstractA 77‐GHz transceiver module has been developed for automotive radar sensors by using an monolithic microwave integrated circuit (MMIC) one‐chip set. An MMIC one‐chip set consists of a transmitter, an eight‐stage low noise amplifier and a mixer. The chip set was fabricated using a 0.15‐μm gate‐length InGaAs/InAlAs/GaAs metamorphic high‐electron mobility transistor (mHEMT) process based on a four‐inch substrate. The transceiver module's total size, including the 38.25 GHz VCO, 76.5 GHz transmitter, 76.5 GHz receiver, 78 GHz LO circuit, IF and BB circuit, and bias circuit, is 80 × 95 × 23 mm3. This MMIC transceiver module is suitable for the 77‐GHz automotive radar sensors and related applications in a W‐band. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2371–2376, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23651
Elastic constant measurement for standard and photosensitive single mode optical fibres
Authors: Antunes P. , Lima Hugo , Monteiro Jorge , André P. S. 
Published: June 2008

AbstractIn this work we determine the elastic constant, the Young modulus, and the strain limit of commercial optical fibers. The fiber rupture limit in standard and Boron codoped photosensitive optical fibers, usually used in FBG‐based sensors, is also quantified. The estimation of such values is extremely relevant, providing useful experimental values to be used in the design and modeling of the sensors. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2467–2469, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23660
A 0.18‐μm 3.1–4.8 GHz CMOS wideband LNA for UWB system
Authors: Jeong Moo I. , Lee Jung N. , Lee Chang S. 
Published: June 2008

AbstractWe have proposed a 3.1–4.8 GHz CMOS wideband low noise amplifier (LNA) for ultra wideband system. The LNA is fabricated with the 0.18‐μm 1P6M standard CMOS process. Measurement of the CMOS LNA was performed using RF probe station. From 3.1 to 4.8 GHz, the wideband LNA exhibits a noise figure of 3.3–3.7 dB, a gain of 12.8–13.9 dB, and an input/output return loss higher then 9.4/7.3 dB. The input IP3 (IIP3) at 4.1 GHz is +1.25 dBm, and consumes 16.5 mW of power. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2368–2371, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23664
Small size low noise amplifier with suppressed noise from gate resistance
Authors: Song Ickhyun , Jhon Hee‐Sauk , Jung Hakchul , Koo Minsuk , Shin Hyungcheol 
Published: June 2008

AbstractIn this article, design and characterization results of a fully integrated 5.8 GHz low noise amplifier (LNA) using 0.13‐μm CMOS technology are presented. Commonly adopted inductive source degeneration for input impedance matching is eliminated to achieve smaller chip area while providing reasonable 50‐Ω matching. Also by adding a capacitor between the gate and the source of the input transistor, a noise source from the gate resistance is partly suppressed. The layout of the designed LNA occupies total area of 0.68 mm2 and the results show forward power gain (S21) of 12.7 dB and noise figure of 3.9 dB while consuming 6.85 mW from 1.2‐V DC supply. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2300–2304, 2008; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.23702
Mechanical properties of natural fibers/polyamides composites
Authors: de Arcaya Patricia Alvarez , Retegi Aloña , Arbelaiz Aitor , Kenny José María , Mondragon Iñaki 
Published: June 2008

AbstractThe aim of this investigation has been to use high performance thermoplastic matrices such as polyamides instead of the commonly used polyolefins to develop natural fiber composites for substituting glass fibers without renouncing to their mechanical properties. For this purpose, different natural fibers such as flax, jute, pure cellulose, and wood pulps have been melt compounded with different polyamides to analyze the effect of fiber content on mechanical properties. Fibers have not been treated as polyamides are less hydrophobic than polyolefins. Thermal behavior of the different fibers was determined by thermogravimetry to know the boundary for processing at high temperatures, since the melting points of the polyamides are much higher than those of polyolefins and this could lead to a higher degradation of the natural fibers. Rheological parameters were deduced by measuring torque values during the mixing process. Flexural and tensile modulus and strength of composites were analyzed, finding an increase in the mechanical properties compared with the unreinforced matrix that turns natural fibers into a considerable reinforcement offering a wealth of possibilities for industrial applications. POLYM. COMPOS., 2009. © 2008 Society of Plastics Engineers