bluuebunny/crossref_metadata_2025_split huggingface dataset:
Donor property of cobalt(II) Schiff base complexes toward triphenyltin(IV)‐chloride: A kinetic study
Authors: Asadi Zahra , Asadi Mozaffar , Mosalanezhad Fatemeh 
Published: January 2012

AbstractIn this study, some cobalt(II)tetraaza Schiff base complexes were used as donors in coordinating to triphenyltin(IV)chloride as acceptors; the kinetics and mechanism of the adduct formation were studied spectrophotometrically. Co(II)tetraaza Schiff base complexes used were [Co(amaen)][N,N′‐ethylene‐bis‐(o‐amino‐α‐methylbenzylideneiminato)cobalt(II)] (1), [Co(appn)] [N,N′‐1,2‐propylene‐bis‐(o‐amino‐α‐phenylbenzylideneiminato)cobalt(II)] (2), [Co(ampen)] [N,N′‐ethylene‐bis‐(o‐amino‐α‐phenylbenzylideneiminato)cobalt‐(II)] (3), [Co(cappn)][N,N′‐1,2‐proylene‐bis‐(5‐chloro‐o‐amino‐α‐phenylbenzylideneiminato)cobalt(II)] (4), and [Co(campen)] [N,N′‐ethylene‐bis‐(5‐chloro‐o‐amino‐α‐phenylbenzylid‐eneiminato)cobalt(II)] (5). The reactivity trend of the complexes in interaction with triphenyltin(IV)chloride was Co(amaen) > Co(appn) > Co(ampen) > Co(cappn) > Co(campen). The linear plots of kobs versus the molar concentration of the triphenyltin(IV)chloride, a high span of the second‐order rate constant k2 values, and large negative values of ΔS≠ and low ΔH≠ values suggest an associative (A) mechanism for the acceptor–donor adduct formation. © 2012 Wiley Periodicals, Inc. Int J Chem Kinet 44: 635–640, 2012
Diagnostic significance of blood eosinophil count in eosinophilic chronic rhinosinusitis with nasal polyps in Chinese adults
Authors: Hu Ying , Cao Ping‐Ping , Liang Geng‐Tian , Cui Yong‐Hua , Liu Zheng 
Published: January 2012

AbstractObjectives/Hypothesis:Over half of chronic rhinosinusitis with nasal polyps (CRSwNP) patients in China show noneosinophilic inflammation. The aim of this study was to compare the clinical characteristics of eosinophilic and noneosinophilic CRSwNP and to identify the predictors of eosinophilic CRSwNP.Study Design:A retrospective study.Methods:There were 155 CRSwNP patients enrolled in the Tongji cohort. Eosinophilic CRSwNP was diagnosed according to our previously published histologic criterion. The demographic and clinical features were compared between eosinophilic and noneosinophilic CRSwNP. Factors associated with eosinophilic CRSwNP were determined with regression analysis, and optimal cutoff points of the predictors were determined by a receiver operating characteristic curve. The optimal cutoff points of the predictors were validated in an independent group of 35 CRSwNP patients referred to as the Taizhou cohort.Results:A male preponderance, a higher prevalence of smoking and atopy, and higher peripheral blood eosinophil absolute count and percentage and blood IgE levels were found in eosinophilic CRSwNP compared with noneosinophilic CRSwNP. Peripheral eosinophil absolute count and percentage were independently and significantly associated with eosinophilic CRSwNP. An absolute blood eosinophil count ≥0.215 × 109/L yielded a sensitivity of 74.2% and a specificity of 86.5%, and a blood eosinophil percentage ≥3.05% yielded a sensitivity of 80.3% and a specificity of 75.3% for the diagnosis of eosinophilic CRSwNP in the Tongji cohort. The validation study in the Taizhou cohort revealed a lower sensitivity and specificity.Conclusions:Eosinophilic and noneosinophilic CRSwNP displayed significant differences in certain clinical features. Peripheral blood eosinophil count could distinguish eosinophilic and noneosinophilic CRSwNP in Chinese adults.
Four‐year outcomes of palatal implants for primary snoring treatment: A prospective longitudinal study
Authors: Rotenberg Brian W. , Luu Kimberly 
Published: January 2012

AbstractObjectives/Hypothesis:The objective of this study was to evaluate the long‐term effectiveness of palatal implants as the treatment of primary snoring.Study Design:Prospective longitudinal cohort study.Methods:This study compared snoring outcomes before and after soft palate implantation for patients diagnosed with primary snoring (no sleep apnea). Snoring severity was obtained by the subjects' sleep partners on a 10‐point Likert scale. A paired Student t test compared the mean scale values preoperatively at week 52 and at the current 4‐year follow‐up. Body mass index for each patient was also compared to evaluate for any significant confounders.Results:Data were obtained from 23 patients out of 26 who were followed for the full study term. The follow‐up time was on average 4 years following palatal implantation. A statistically (P < .016) and clinically significant improvement in the snoring scale was noted when comparing snoring severity between the preoperative and 4‐year period and between the 52‐week and 4‐year scores. Although statistically significant improvement was found between the preoperative period and 52 weeks, there was a clinical deterioration in snoring scale scores between 52 weeks and 4 years. The mean (standard deviation) preoperative score was 9.5 (0.5), mean week‐52 score was 5.0 (1.6), and mean 4‐year score was 7.0 (1.8). Body mass index did not change through the observation interval.Conclusions:Soft palate implantation is a possible surgical technique with which to attempt to achieve subjective improvement of primary snoring severity. Subjective improvement, however, deteriorates significantly over time, and is only minimally sustained at 4 years postoperatively. This study provides new information on long‐term palatal implant effectiveness.
Common genetic variants in TERT contribute to risk of cervical cancer in a Chinese population
Authors: Wang Sumin , Wu Jiangping , Hu Lingmin , Ding Chenyue , Kan Yanjing , Shen Yan , Chen Xiaojun , Shen Hongbing , Guo Xirong , Hu Zhibin 
Published: January 2012

AbstractSingle‐nucleotide polymorphisms (SNPs) of TERT rs2736098, rs2736100, and CLPTM1L rs402710 at 5p15.33 are significantly associated with risk of a spectrum of cancers. However, cervical cancer has been rarely evaluated. In this study, we genotyped the three SNPs in a case–control study with 1,033 cervical cancer cases and 1,053 cancer‐free controls in a Chinese population. Logistic regression analyses showed that the two TERT SNPs both significantly associated with cervical cancer risk in the recessive model (rs2736098, AA vs. AG/GG: adjusted OR = 1.35, 95% CI = 1.06–1.72; rs2736100, CC vs. AC/AA: adjusted OR = 1.38, 95% CI = 1.11–1.73). However, no association was found between CLPTM1L rs402710 and cervical cancer. These results suggest that genetic variants in 5p15.33, especially in TERT, may be markers for susceptibility to cervical cancer. © 2012 Wiley Periodicals, Inc.
The eclectic theory of international production: A case study of the international hotel industry
Authors: Dunning John H. , McQueen Matthew 
Published: January 2012

AbstractThis paper presents comprehensive data on the growth, structure and forms of involvement of multinational enterprises in the international hotel industry, and uses this data to provide empirical support for the eclectic theory of international production. Our understanding of the international hotel industry is that the ownership of a hotel often has the characteristics of portfolio investment and that the owners may have little knowledge of hotel operations. In these circumstances they will invariably employ a professional management company to run the hotel under a long term contract providing them with full control over the operation of the hotel. A particular feature of this paper is therefore to distinguish between, what we term, ‘equity‐based control’ and ‘contract‐based control’ of the enterprise and to point out the implications of this distinction for the analysis of the multinational enterprise.
Cost‐benefit evaluation of a new technology for treatment of peptic ulcer disease
Authors: Paterson Morton L. 
Published: January 2012

AbstractPsychosocial benefit resists monetary expression. However, reduction in costs, with no loss of benefits assumed, improves a cost‐benefit ratio. The effect of cimetidine on the costs of ulcer has been widely studied. Randomized clinical trials show reductions in surgery and work loss among cimetidine‐treated patients versus placebo controls. In the community, time series studies have documented drops in ulcer surgery, averaging about 25% below the expected trend line, following marketing introduction of the drug. These, plus a cross‐sectional study of Medicaid patients with and without use of cimetidine, indicate that the drug has reduced the net direct costs of ulcer disease.
Unplanned buying and in‐store stimuli in supermarkets
Authors: Abratt Russell , Goodey Stephen Donald 
Published: January 2012

AbstractManufacturers and retailers in industrialized countries spend large sums on advertising and/or in‐store promotion in the hope of increasing sales of their merchandise through ‘impulse’ buying. Results are reported in this paper of the unplanned buying behaviour of 450 consumers in 15 major supermarkets in South Africa compared with similar studies in the United States and the United Kingdom. The findings indicate that unplanned buying is higher in the United States than in South Africa, but that the importance of in‐store stimuli holds true across cultures. Analysis of other variables such as brand loyalty, specific outlet, and presence of a shopping list is also reported on a cross‐cultural basis.
Timing of the administration of suramin treatment after muscle injury
Authors: Nozaki Masahiro , Ota Shusuke , Terada Satoshi , Li Yong , Uehara Kenji , Gharaibeh Burhan , Fu Freddie H. , Huard Johnny 
Published: January 2012

AbstractIntroduction:It has been reported that suramin treatment can improve muscle healing; however, details about optimizing the dosing requirements remain unclear. The purpose of this study was to determine the optimal timing of suramin administration and investigate the effects it had on the expression of myostatin, follistatin, and muscle vascularity after muscle injury.Methods:Contusion injured muscles of mice were treated with suramin at 1, 2, or 3 weeks post‐injury and evaluated histologically and physiologically at 1, 2, and 10 days after injection.Results:Suramin treatment initiated at 2 weeks post‐injury was observed to promote muscle regeneration and muscle strength, and to decrease fibrosis. Suramin reduced myostatin expression and increased follistatin expression and vascularity in injured skeletal muscle.Conclusions:Suramin's positive effect on muscle regeneration is thought to be due to its enhancement of follistatin expression which increases neoangiogenesis and inhibits myostatin's promotion of fibrosis. Muscle Nerve 46: 70–79, 2012
GDNF released from microspheres enhances nerve regeneration after delayed repair
Authors: Wood Matthew D. , Kim Howard , Bilbily Alex , Kemp Stephen W.P. , Lafontaine Christine , Gordon Tessa , Shoichet Molly S. , Borschel Gregory H. 
Published: January 2012

AbstractIntroduction: Delays in surgical repair following nerve transection produce progressively inferior motor nerve regeneration. Regeneration can be improved with delivery of exogenous growth factor. We developed a delivery system that could be applied at the nerve repair site to deliver growth factors locally to regenerating nerve. Methods: Poly(lactic‐co‐glycolic acid) microspheres containing glial‐derived neurotrophic factor (GDNF) suspended within fibrin were developed into a delivery system for local application surrounding nerve at a repair site in an experimental rat model. Results: The system containing GDNF remained at the injury site for up to 2 weeks and improved motor nerve regeneration following chronic axotomy and denervation. Conclusions: Based on the positive outcome of the delivery system, we plan to study the delivery system over longer time courses of release and nerve regeneration. Muscle Nerve 46: 122–124, 2012
Prescriptive contraceptive use among isotretinoin users in the Netherlands in comparison with non‐users: a drug utilisation study
Authors: Crijns Hubertina J.M.J. , van Rein Nienke , Gispen‐de Wied Christine C. , Straus Sabine M. , de Jong‐van den Berg Lolkje T.W. 
Published: January 2012

ABSTRACTPurposeTo assess the compliance with the isotretinoin Pregnancy Prevention Programme (PPP) by evaluating the use of prescribed contraceptives among isotretinoin users. The PPP contains a requirement for the use of contraceptive methods for women of childbearing potential.MethodsA drug utilisation study was performed using data from a drug prescription database (containing Dutch community pharmacy data) covering a population of 500 000 patients. Contraceptive use in female isotretinoin users and in a reference group of female non‐isotretinoin users (aged 15–49 years) was compared using data from 1999 until 2006 in 2‐year periods. Descriptive statistics were used.ResultsOf the female isotretinoin users (n = 651), 52%–54% filled prescriptions on contraceptives in strict accordance to the PPP, used before, during, and after discontinuation of isotretinoin, compared with 39%–46% in the reference group. A more liberal approach of a minimum of one prescription for a contraceptive method showed 61%–64% use of contraceptives among isotretinoin users. Similar patterns were seen when data were broken down in age groups. Furthermore, a higher proportion of female patients using isotretinoin prescribed by general practitioners used prescribed contraceptives compared with those receiving isotretinoin by specialists.ConclusionCompliance with the contraceptive use according to a PPP for a teratogenic drug such as isotretinoin is 52%–64%, which is lower than anticipated. Reasons for the low compliance will need to be clarified before further measures can be taken. Copyright © 2012 John Wiley & Sons, Ltd.
Integration of vole management in boreal silvicultural practices
Authors: Huitu Otso , Rousi Matti , Henttonen Heikki 
Published: January 2012

AbstractVoles of the genera Microtus and Myodes are widespread and among the most abundant of small mammal species in the boreal zone of the Northern Hemisphere. They are keystone herbivore species in northern ecosystems, and they have profound impacts on both higher and lower trophic levels. Voles are also major silvicultural pests, damaging millions of tree seedlings in years of peak abundance. Prevention of vole damage to silviculture has proven to be very difficult owing to the ubiquity of both suitable vole habitat and potential damage sites across landscapes. The degree of damage inflicted by voles on seedling stands is largely, but not solely, determined by prevailing vole densities, which often fluctuate in 3–4 year population cycles. Silvicultural practices related to site habitat manipulation and/or choice and rearing of seedling material may also greatly influence the severity of vole damage to seedlings. The manipulation of these practices is currently at the forefront of methods potentially applicable to control vole damage in boreal forests. This paper reviews current evidence for the efficacy and present recommendations for further development and application of these methods to mitigate vole damage to seedling stands in boreal silviculture. © 2012 Society of Chemical Industry
Density functional theory study of ultrasmall diameter (2,2) boron nitride, silicon carbide, and carbon nanotubes
Authors: Fakhrabad Davoud Vahedi , Movlarooy Tayebeh , Shahtahmassebi Nasser 
Published: January 2012

AbstractWe present a first principles calculation on the electronic structure and optical properties of ultrasmall‐diameter (2,2) boron nitride, silicon carbide, and carbon nanotubes (BNNT, SiCNT, and CNT) by using full potential linear augmented plane wave (FP‐LAPW) and pseudo potential plane wave (PP‐PW) methods. The atomic geometries of all considered models are optimized. Calculations of optical spectra are performed under electric fields polarized both parallel and perpendicular with respect to the nanotube (NT) axis. Our results show that the dielectric function is anisotropic and it is revealed that (2,2) SiCNT would be better dielectric material than (2,2) BNNT. We have calculated the first, second and third optical transitions for the considered models. The value of the optical gap for (2,2) BNNT is obtained much larger than that of (2,2) SiCNT and (2,2) CNT. The results show that contrary to the (2,2) CNT being metallic, the (2,2) BNNT, and (2,2) SiCNT are wide indirect gap semiconductors. We also present the energy loss function; in this case the intertube interactions play an important role with respect to the optical spectroscopy. Our results revealed that unlike the dielectric function, the calculated energy loss function show rather weak anisotropy.
Reduced fragmentation in liquid injection field desorption/ionization Fourier transform ion cyclotron resonance mass spectrometry by use of helium for the thermalization of molecular ions
Authors: Bernhard Linden H. , Gross Jürgen H. 
Published: January 2012

RATIONALETo exploit the softness of liquid injection field desorption/ionization (LIFDI), the molecular ions, M+•, need to be transferred from their origin at the field emitter through the mass analyzer without disrupting their integrity. To preserve the molecular ions, ion‐activating events like collisions must therefore be avoided. In hybrid quadrupole Fourier transform ion cyclotron resonance (FT‐ICR) mass spectrometers, however, multiple ion‐guiding and ion‐trapping events occur prior to mass analysis. The effects thereof compromised initial spectra from a LIFDI and electrospray ionization (ESI) combination (LIFDI‐ESI) ion source and, thus, called for refined experimental conditions.METHODSA hybrid quadrupole FT‐ICR instrument equipped with a new LIFDI‐ESI combination ion source was used to obtain LIFDI spectra of polystyrene 1050, of 2,3,4‐tridodecyloxybenzaldehyde, and of sewing machine oil as well as a field ionization (FI) spectrum of pentafluoroiodobenzene. The abundance of molecular ions, M+•, was optimized, in particular by variation of the trapping conditions inside the instrument's accumulation RF‐hexapole ion trap.RESULTSIon–buffer gas collisions in the instrument's accumulation RF‐hexapole ion trap were detrimental to the easy‐to‐fragment molecular ions of hydrocarbon species, whereas more robust even‐electron ions were not affected. Exchanging the instrument's standard supply of argon buffer gas for helium resulted in a remarkable improvement. Together with further adjustments of potentials applied along the ion transfer path, hydrocarbon species could be analyzed.CONCLUSIONSThe use of helium buffer gas remarkably improved LIFDI spectra, because the loss of molecular ions by dissociation during transfer from the LIFDI source into the ICR cell was significantly reduced. Hydrocarbon species could be analyzed while fragmentation of ions was avoided for the most part. Copyright © 2012 John Wiley & Sons, Ltd.
ThSi2 Type Ytterbium Disilicide and its Analogues YbTxSi2–x (T = Cr, Fe, Co)
Authors: Peter Sebastian C. , Kanatzidis Mercouri G. 
Published: January 2012

AbstractYbSi2 and the derivatives YbTxSi2–x (T = Cr, Fe, Co) crystallizing in the α‐ThSi2 structure type were obtained as single crystals from reactions run in liquid indium. All silicides were investigated by single‐crystal X‐ray diffraction, I41/amd space group and the lattice constants are: a = 3.9868(6) Å and c = 13.541(3) Å for YbSi2, a = 4.0123(6) Å and c = 13.542(3) Å for YbCr0.27Si1.73, a = 4.0142(6) Å and c = 13.830(3) Å for YbCr0.71Si1.29, a = 4.0080(6) Å and c = 13.751(3) Å for YbFe0.34Si1.66, and a = 4.0036(6) Å, c = 13.707(3) Å for YbCo0.21Si1.79. YbSi2 and YbTxSi2–x compounds are polar intermetallics with three‐dimensional Si and M (T+Si) polyanion sub‐networks, respectively, filled with ytterbium atoms. The degree of substitution of transition metal at the silicon site is signficant and leads to changes in the average bond lengths and bond angles substantially.
Synthesis, Structure, and Photophysical Properties of the Di‐ and Trinuclear Phosphine‐Diimine Complexes of Copper(I)
Authors: Smirnova Ekaterina S. , Melekhova Anna A. , Gurzhiy Vladislav V. , Selivanov Stanislav I. , Krupenya Dmitrii V. , Koshevoy Igor O. , Tunik Sergey P. 
Published: January 2012

AbstractReactions of [Cu(NCMe)4]+ with stoichiometric amount of diphosphine R2P–(C6H4)n–PR2, (R = NC4H4, n = 1; R = Ph, n = 1, 2, 3) or tri‐phosphine 1, 3, 5‐(PPh2–C6H4–)3–C6H3 ligands give the corresponding di‐ or trinuclear copper(I) acetonitrile‐phosphine complexes 1–5. Substitution of the labile acetonitrile groups with chelating aromatic diimines – 2, 2′‐bipyridine (bpy), 1, 10‐phenanthroline (phen), 5, 6‐dimethyl‐1, 10‐phenanthroline (dmp), 5, 6‐dibromo‐1, 10‐phenanthroline (phenBr2) – gives the corresponding substituted compounds 6–16. In all complexes 1–16 each central CuI atom has tetrahedral configuration completed with two N‐ and two P‐donor groups. The compounds obtained were characterized using elemental analysis, ESI‐MS, X‐ray crystallography, and NMR spectroscopy. All phosphine‐diimine compounds 6–16 are photoluminescent at room temperature both in dichloromethane solution and in solid state (λex = 385 nm). In CH2Cl2 solution the maxima of emission bands are found in a range 540–640 nm, and in solid in a similar range 538–620 nm. Emission of 6–16 is assigned to the triplet excited state dominated by the charge transfer transitions with contribution of the MLCT character.
Rotation of spheroidal particles in Couette flows
Authors: Huang Haibo , Yang Xin , Krafczyk Manfred , Lu Xi-Yun 
Published: January 2012

AbstractThe rotation of a neutrally buoyant spheroidal particle in a Couette flow is studied by a multi-relaxation-time (MRT) lattice Boltzmann method. We find several new periodic and steady rotation modes for a prolate spheroid for Reynolds numbers ($\mathit{Re}$) exceeding 305. The simulations cover the regime up to $\mathit{Re}\leq 700$. The rotational behaviour of the spheroid appears to be not only sensitive to the Reynolds number but also to its initial orientation. We discuss the effects of initial orientation in detail. For $305\lt \mathit{Re}\lt 345$ we find that the prolate spheroid reaches a periodic mode characterized by precession and nutation around an inclined axis which is located close to the middle plane where the velocity is zero. For $345\lt \mathit{Re}\lt 385$, the prolate spheroid precesses around the vorticity direction with a nutation. For $\mathit{Re}$ close to the critical ${\mathit{Re}}_{c} \approx 345$, a period-doubling phenomenon is observed. We also identify a motionless mode at higher Reynolds numbers ($\mathit{Re}\gt 445$) for the prolate spheroid. For the oblate spheroid the dynamic equilibrium modes found are log rolling, inclined rolling and different steady states for $\mathit{Re}$ increasing from 0 to 520. The initial-orientation effects are studied by simulations of 57 evenly distributed initial orientations for each $\mathit{Re}$ investigated. Only one mode is found for the prolate spheroid for $\mathit{Re}\lt 120$ and $385\lt \mathit{Re}\lt 445$. In other $\mathit{Re}$ regimes, more than one mode is possible and the final mode is sensitive to the initial orientation. However, the oblate spheroid dynamics are insensitive to its initial orientation.