bluuebunny/crossref_metadata_2025_split huggingface dataset:
High‐resolution estimation for time‐variant MIMO channel sounding
Authors: Lopez Sofia Martinez , Braga A. Judson , Huyart Bernard , Cousin J. C. 
Published: September 2008

AbstractA wideband vector channel sounder with 16 parallel RF chains is proposed for parameter estimation in an indoor channel. Low‐cost and high‐resolution are obtained by using a chirp probe signal, five‐port receivers and the MUSIC algorithm. The system covers up to 500 MHz centred at 2.45 GHz. Experimental results show errors inferior to 1 ns in the time domain and of few degrees in the angular domain. Accurate results are found in static as well as in time‐variant scenarios. Copyright © 2008 John Wiley & Sons, Ltd.
Channel estimation methods for preamble‐based OFDM/OQAM modulations
Authors: Lélé C. , Javaudin J.‐P. , Legouable R. , Skrzypczak A. , Siohan P. 
Published: September 2008

AbstractIn this paper, OFDM/OQAM is proposed as an alternative to conventional OFDM with cyclic prefix (CP) for transmission over multi‐path fading channels. Two typical features of the OFDM/OQAM modulation are the absence of a guard interval (GI) and the fact that the orthogonality property only holds in the real field and for a distortion‐free channel. Thus, the classical channel estimation (CE) methods used for OFDM cannot be directly applied to OFDM/OQAM. Therefore, we propose an analysis of the transmission of an OFDM/OQAM signal through a time‐varying multi‐path channel and we derive two new CE methods. The first proposed method only requires the use of pair of real pilots (POP). In a second method, named interference approximation method (IAM), we show how the imaginary interference can be used to improve the CE quality. Several preamble variants of the IAM are compared with respect to the resulting instantaneous power. Finally, the performance results obtained for the transmission of an OFDM/OQAM signal through an IEEE 802.22 channel using the POP method and three variants of IAM are compared to those obtained with CP‐OFDM. Copyright © 2008 John Wiley & Sons, Ltd.
Characterization of photocrosslinked alginate hydrogels for nucleus pulposus cell encapsulation
Authors: Chou Alice I. , Nicoll Steven B. 
Published: September 2008

AbstractIntervertebral disc (IVD) degeneration is a significant health concern in the USA. Tissue engineering strategies have the potential to provide a viable alternative to current treatments. Nevertheless, such approaches require a suitable biomaterial scaffold for IVD tissue regeneration. Calcium crosslinked alginate has traditionally been used for in vitro culture of nucleus pulposus (NP) cells of the IVD. However, such ionically crosslinked hydrogels lose structural integrity over time. Recently, various polymers have been modified with photopolymerizable functional groups to create covalently crosslinked hydrogels. This technology may be employed to maintain the structural and mechanical integrity of three‐dimensional alginate hydrogels. In this study, photocrosslinkable alginate was synthesized and evaluated for material properties and the ability to maintain the viability of encapsulated NP cells. Photocrosslinked alginate at varying percent modifications and weight/volume percentages displayed equilibrium swelling ratios and Young's moduli of 30.52 ± 1.782 to 43.50 ± 1.345 and 0.5850 ± 0.1701 to 8.824 ± 0.6014 kPa, respectively. The viability of encapsulated NP cells was highest in hydrogels at lower percent modifications, and decreased with time in culture. Taken together, this study is the first to demonstrate that photocrosslinked alginate can be used for cellular encapsulation and synthesized with tunable material properties that may be tailored for specific applications. © 2008 Wiley Periodicals, Inc. J Biomed Mater Res, 2009
Evidence‐based group psychotherapy: using AGPA's practice guidelines to enhance clinical effectiveness
Authors: Leszcz Molyn , Kobos Joseph C. 
Published: September 2008

AbstractPractice guidelines represent a useful approach to facilitate the delivery of evidence‐based mental health care. In this article, we detail group psychotherapy practice guidelines developed by the American Group Psychotherapy Association (AGPA). Combining the research literature with expert consensus, the AGPA has created a resource that should prove useful for psychotherapists, administrators, and patients. We illustrate the guidelines through a series of clinical dilemmas and challenges. © 2008 Wiley Periodicals, Inc. J Clin Psychol: In Session 64: 1–23, 2008.
Using the CORE‐R battery in group psychotherapy
Authors: Strauss Bernhard , Burlingame Gary M. , Bormann Bianca 
Published: September 2008

AbstractThis article applies and illustrates the American Group Psychotherapy Association (AGPA) revised CORE battery to daily practice. The CORE can assist practitioners in periodically or continuously monitoring outcome and process factors to determine patient status (e.g., improved, deteriorated, or no change), and ruptures in the therapeutic relationships. The CORE‐R provides group therapists with a tool kit of measures for assessing the effectiveness of their groups and includes three classes of measures: selection, process, and outcome. We provide a summary of each class of measures along with specific instruments. © 2008 Wiley Periodicals, Inc. J Clin Psychol: In Session 64:1–13, 2008.
Application of negative ion MS/MS to the identification of N‐glycans released from carcinoembryonic antigen cell adhesion molecule 1 (CEACAM1)
Authors: Harvey David J. , Baruah Kavitha , Scanlan Christopher N. 
Published: September 2008

AbstractStructures of N‐glycans released from rat CEACAM1 expressed in human embryonic kidney cells were determined by MALDI and negative ion nanospray MS/MS techniques. The major carbohydrates were bi‐, tri‐ and tetra‐antennary complex glycans with and without sialic acid, fucose and bisecting GlcNAc residues. High‐mannose glycans, predominantly Man5GlcNAc2, were also found. The negative ion fragmentation technique easily identified the branching pattern of the triantennary glycans (mainly branched on the 6‐antenna) and the presence of ‘bisecting’ GlcNAc residues (attached to the 4‐position of the core mannose), features that are difficult to determine by traditional techniques. Sialic acids were in both α2–3 and α2–6 linkage as determined by MALDI‐TOF MS following linkage‐specific derivatization. Copyright © 2008 John Wiley & Sons, Ltd.
Potential plant growth promoting traits and bioacidulation of rock phosphate by thiosulfate oxidizing bacteria isolated from crop plants
Authors: Anandham R. , Gandhi P. Indira , Madhaiyan M. , Sa Tongmin 
Published: September 2008

AbstractThiosulfate oxidizing bacteria isolated from crop plants were tested for their traits related to plant growth promotion and their ability to solubilize Morocco rock phosphate (RP) through oxidation of thiosulfate to sulfuric acid. All the tested strains grew in Nfb medium (except Dyella ginsengisoli) and possessed β‐1,3 glucanase activity (except Burkholderia kururiensis). Of the fourteen tested strains, 2 were found positive for siderophore production, 3 each for phytohormones (IAA), and salicylic acid production. Based on qualitative and quantitative assays, 5 strains were found to efficiently solubilize tri‐calcium phosphate in Pikovskaya's medium. Nine strains exhibited ACC (1‐aminocyclopropane‐1‐carboxylate) deaminase activity. In gnotobiotic experiments, Pandoraea sputorum ATSB28 which possessed the lowest ACC deaminase (0.44 nM of α‐Keto butyrate formed min–1 mg of protein–1) activity increased the primary root length of canola by 166%. Inoculation of Pandoraea sp. strain ATSB30 in mixture containing RP and thiosulfate significantly enhanced the water extractable‐P (1147 μg P g RP–1) and bicarbonate extractable‐P (1144 μg P g RP–1) on day 45. Glucose amendment resulted in increased RP solubilization as compared to glucose unamended treatments. Thiosulfate oxidizing bacteria tested in this study possessed at least one or more plant growth promoting traits apart from thiosulfate oxidation and solubilized the RP. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Diversity studies of Azotobacter spp. from cotton‐wheat cropping systems of India
Authors: Bhatia Ranjana , Ruppel Silke , Narula Neeru 
Published: September 2008

AbstractAzotobacter are the favored bioinoculants being promoted for cotton crop in India. In order to develop bioinoculants, both metabolic fingerprinting and genetic fingerprinting have been used to study the diversity among Azotobacter spp. isolated from four different cotton‐wheat cropping regions of India. On the basis of acetylene reduction, indole acetic acid production and ammonia excretion, from 76 free‐living diazotrophs isolated from the rhizospheric soil of cotton, 20 efficient isolates were selected for further studies. Morphological characterization indicated a close resemblance of these isolates to Azotobacter spp. BIOLOG cataloguing divided them into two main groups, but amplified ribosomal DNA restriction analysis clustered the isolates from the four regions having different soil types into four separate sub‐clusters. Metabolic fingerprinting was not able to detect subtle differences among the isolates as achieved with genetic fingerprinting. However, 16S rRNA is a highly conserved locus. Variations observed could be due to domestication of the isolates in different agro‐ecological niches. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Characterization of metal‐resistant plant‐growth promoting Bacillus weihenstephanensis isolated from serpentine soil in Portugal
Authors: Rajkumar Mani , Ma Ying , Freitas Helena 
Published: September 2008

AbstractA metal‐resistant bacterial strain SM3 isolated from a serpentine soil in the north‐east of Portugal was characterized as Bacillus weihenstephanensis based on the morphological and biochemical characteristics and on the comparative analysis of the partial 16S ribosomal DNA sequence. Bacillus weihenstephanensis SM3 showed a high degree of resistance to nickel (1500 mg l–1), copper (500 mg l–1) and zinc (700 mg l–1) and also to antibiotics (ampicillin, penicillin, kanamycin and streptomycin). Strain SM3 has also exhibited the capability of solubilizing phosphate and producing indole‐3‐acetic acid (IAA) both in the absence and in the presence of metals (Ni, Cu and Zn). A pot experiment was conducted to elucidate the effects of strain SM3 on plant growth and uptake of Ni, Cu or Zn by Helianthus annuus. Inoculation with strain SM3 increased the shoot and root biomass of H. annuus grown in both non‐contaminated and contaminated soil. Furthermore, strain SM3 increased the accumulation of Cu and Zn in the root and shoot systems. A batch experiment was also conducted to assess the metal mobilization potential of strain SM3 in soil. Inoculation with this strain increased the concentrations of water soluble Ni, Cu and Zn in soil. Metal solubilization by this bacterial strain may be an important process to promote the uptake of heavy metals by plants. This study elucidates the multifarious role of strain SM3 in plant growth promotion and its metal mobilizing potential. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Reassessing employer expectations of graduates in UK travel services
Authors: Major Bridget , Evans Nigel 
Published: September 2008

AbstractThis article sets out to ascertain travel and tourism industries employers' views on degrees. Research of this kind and on this scale has not previously been carried out and a large scale survey of industry views was conducted with key issues identified and discussed. These cover topics such as the employment of graduates within the UK travel services industry, views on their contribution and appropriateness, the types of skills that such degrees provide, salary scales and graduate training schemes. Current government policy on widening participation in higher education (HE) and its impact on industry skills is also evaluated. The issue of the provision of tourism curricula and their content has at the beginning of 2007 once again been pushed centre stage. This is as a result of the increasing scrutiny of the Sector Skills organisation People 1st and the launch of the government's new vocational diplomas in 2008. The findings in this article are pertinent for government bodies and educators alike and have previously been shared with the Sector Skills organisation and Department of Culture, Media and Sport (DCMS) in addressing HE in tourism. Copyright © 2008 John Wiley & Sons, Ltd.
Destination product characteristics as useful predictors for repeat visiting and recommendation segmentation variables in tourism: a CHAID exhaustive analysis
Authors: Vassiliadis Chris A. 
Published: September 2008

AbstractThe present paper constitutes a segmentation research with the use of the exhaustive chi‐squared automatic interaction detection tree analysis approach which, through the characteristics of a tourist destination, aims at the illustration of the English and German tourist groups and more specifically, (i) those who are repeat visitors of several tourist destinations and (ii) those who express a willingness to urge other people to visit geographic tourist destinations that the former have already visited. The results of the research help the tourism managers to apprehend the characteristics of the destination products that best describe the visitors. Copyright © 2008 John Wiley & Sons, Ltd.
Perception of authenticity of tourist art among Native American artists in Santa Fe, New Mexico
Authors: Maruyama Naho U. , Yen Tsu‐Hong , Stronza Amanda 
Published: September 2008

AbstractThis study investigated the authenticity of tourist art from the perspectives of Native American artists in Santa Fe, New Mexico. In‐depth interviews with nine artists revealed that authenticity of art for the artists strongly relates to the traditional manufacturing process. Indeed, the artists alter their art piece's exterior to appeal to tourists while also adhering to the traditional process of manufacture. Rather than connoting a loss of authenticity, they identify the process as an “enlargement” of the culture. The challenge for the artists is to improve understanding of the significance of the manufacturing process among tourists and younger generations of artists. Copyright © 2008 John Wiley & Sons, Ltd.
Control of dynamic stability during gait termination on a slippery surface in Parkinson's disease
Authors: Oates Alison R. , Frank Jim S. , Patla Aftab E. , VanOoteghem Karen , Horak Fay B. 
Published: September 2008

AbstractThis study investigated how Parkinson's disease (PD) affects the ability to switch from locomotion to gait termination (GT) during planned and cued GT and examined the effect of PD on the integration of a reactive, balance maintenance strategy into voluntary GT. After a series of stops on a stable surface, eight participants with and 10 without PD stopped on a surface, which slid quickly and unexpectedly forward mimicking a slippery surface. PD caused instability during the completely voluntary nonslippery stops (P = 0.012) but not during the slippery stops, which required a reactive movement. The PD group walked slower [0.9–1.0 m/s vs. 1.3 m/s, respectively (P < 0.001)] with shorter steps during the first step of nonslippery GT (P = 0.016) and with wider steps during all steps of nonslippery GT (P ≤ 0.05). Similar to controls, the PD group increased lateral stability during planned GT compared to cued GT (P = 0.007). The timing of gait termination was similar between groups in all conditions. During the unexpected perturbation, both groups used a generalized slip response to regain balance after the perturbation. PD did not affect the ability to stop walking or to integrate a balance‐correcting response into GT but did affect movement speed, size, and stability of the voluntary movement. © 2008 Movement Disorder Society
Brain response to complex visual stimuli in Parkinson's patients with hallucinations: A functional magnetic resonance imaging study
Authors: Ramírez‐Ruiz Blanca , Martí María‐José , Tolosa Eduardo , Falcón Carlos , Bargalló Nuria , Valldeoriola Francesc , Junqué Carme 
Published: September 2008

AbstractVisual hallucinations (VH) in Parkinson's disease (PD) have been associated with gray matter reductions in visual associative areas and with abnormal patterns of brain activation in posterior and frontal regions. However, all previous fMRI studies have used simple visual stimuli. The objective of our study was, therefore, to compare the pattern of brain activation during a one‐back face detection task. We examined 10 PD patients with VH, 10 PD patients without VH, and 10 controls matched for age and education. The fMRI task consisted in three blocks of 21‐face stimuli (activation condition) and three blocks of 21‐colored mosaics (control condition). Subjects were asked to press a key when two identical stimuli were presented consecutively. During the face condition, compared with patients without VH, hallucinating PD patients showed significant reductions in the activation of several right prefrontal areas, such as the inferior (BA 10,47), superior (BA 6/8), middle frontal (BA 8), and anterior cingulate gyrus (BA 31/32). In the control condition, we found a hyperactivation in the hallucinating PD sample compared with the nonVH patients in the right inferior frontal gyrus. A dysfunction of the frontal areas associated with the control of attention could predispose to VH through an abnormal processing of relevant and irrelevant visual stimuli. © 2008 Movement Disorder Society
Clinical correlates of depressive symptoms in familial Parkinson's disease
Authors: Pankratz Nathan , Marder Karen S. , Halter Cheryl A. , Rudolph Alice , Shults Cliff W. , Nichols William C. , Foroud Tatiana 
Published: September 2008

AbstractDepression is one of the most common nonmotor complications of Parkinson's disease (PD) and has a major impact on quality of life. Although several clinical factors have been associated with depression in PD, the relationship between depression and stage of illness as well as between depression and degree of disability remains controversial. We have collected clinical data on 1,378 PD cases from 632 families, using the Unified Parkinson's Disease Rating Scale (UPDRS) Parts II (activities of daily living) & III (motor), the Mini‐Mental State Exam, the Geriatric Depression Scale (GDS), and the Blessed Functional Activity Scale (Blessed). Analyses were performed using the 840 individuals with verified PD and without evidence of cognitive decline. Logistic regression was used to identify study variables that individually and collectively best predicted the presence of depressive symptoms (GDS ≥ 10). After correcting for multiple tests, depressive symptoms were significantly associated with Hoehn and Yahr stage and other clinical measures but not with any genetic variant (parkin, LRRK2, APOE). The Blessed score, education, presence of a first degree relative with signs of depression, and UPDRS Part II were found to best predict depressive symptomatology (R2 = 0.33; P = 4 × 10−48). Contrary to several reports, the results from this large study indicate that stage of illness, motor impairment, and functional disability are strongly correlated with depressive symptoms. © 2008 Movement Disorder Society
Effects of contact location and voltage amplitude on speech and movement in bilateral subthalamic nucleus deep brain stimulation
Authors: Tripoliti Elina , Zrinzo Ludvic , Martinez‐Torres Irene , Tisch Stephen , Frost Eleanor , Borrell Ellie , Hariz Marwan I. , Limousin Patricia 
Published: September 2008

AbstractSubthalamic nucleus deep brain stimulation (STN‐DBS) is particularly effective in improving limb symptoms in Parkinson's disease. However, speech shows a variable response. Contact site and amplitude of stimulation have been suggested as possible factors influencing speech. In this double blind study, we assessed 14 patients post bilateral STN‐DBS, without medication. Six conditions were studied in random order as follows: stimulation inside the STN at low voltage (2 V) and at high voltage (4 V); above the STN at 2 V and at 4 V, at usual clinical parameters, and off‐stimulation. The site of stimulation was defined on the postoperative stereotactic MRI data. Speech protocol consisted of the assessment of intelligibility of the dysarthric speech, maximum sustained phonation, and a 1‐minute monologue. Movement was assessed using the UPDRS‐III. Stimulation at 4 V significantly reduced the speech intelligibility (P = 0.004) independently from the site of stimulation. Stimulation at 4 V significantly improved the motor function. Stimulation inside the nucleus was significantly more effective than outside the nucleus (P = 0.0006). The significant improvement in movement coupled with significant deterioration in speech intelligibility when patients are stimulated inside the nucleus at high voltage indicates a critical role for electrical stimulation parameters in speech motor control. © 2008 Movement Disorder Society
A multiscale modeling of damage and time‐dependent behavior of cohesive rocks
Authors: Abou‐Chakra Guéry A. , Cormery F. , Shao J. F. , Kondo D. 
Published: September 2008

AbstractThe present paper deals with a micromechanical approach to modeling the time‐dependent mechanical behavior of a class of cohesive geomaterials. The considered material is Callovo‐Oxfordian argillite, which is mainly composed of three constituents: an elastoviscoplastic clay matrix, elastic quartz minerals, and elastic damaged calcite grains. The macroscopic constitutive law is obtained by adapting the incremental method proposed by Hill (J. Mech. Phys. Solids 1965; 13:89–101). Its unified formulation allows a description of not only the time‐dependent behavior of the argillite but also its elastoplastic damage response. The developed model is first validated by comparison with finite element solutions and then it is applied to the prediction of argillites' macroscopic responses in connection with their mineralogical compositions. The validity of the model is checked through comparisons between the model's predictions and experimental data. Copyright © 2008 John Wiley & Sons, Ltd.
Spinal pathological findings in ancient Egyptians of the Greco‐Roman period living in Bahriyah Oasis
Authors: Hussien F. H. , El‐Din A. M. Sarry , Kandeel W. A. El Samie , Banna R. A. E‐S. El 
Published: September 2008

AbstractThe spine can provide a large amount of information about an individual's physical condition and possible lifestyle through palaeopathological investigations. The aim of this research was to study spinal diseases among Greco‐Roman ancient Egyptians from Bahriyah Oasis, and to compare them with those from Giza of the Old Kingdom. The material used in the study included 809 single vertebrae and 77 adult sacra of ancient Egyptians from the Greco‐Roman period (332–30 BC) that were excavated from Bahriyah Oasis. The spinal elements were examined for pathological conditions, degenerative diseases, trauma, congenital abnormalities, infectious diseases and neoplasms. The most common lesions of the spine were those due to degenerative processes. The articular facets were more affected than the vertebral bodies. Compression fractures of the bodies, mostly due to osteoporosis, were found in 1.44% and 5.07% of thoracic and lumbar vertebrae respectively. The percentage of spina bifida occulta among ancient Egyptians from Bahriyah Oasis was 62.33%, while among those from Giza was only 3.33%. Few cases of lumbar spondylolysis and one case of DISH were recorded. No cases of infectious or neoplastic diseases were found. Copyright © 2008 John Wiley & Sons, Ltd.