bluuebunny/crossref_metadata_2025_split huggingface dataset:
Magnetic Properties of the Ordered Double Perovskite Sr2MnTeO6
Authors: Ortega‐San Martin Luis , Chapman Jon P. , Lezama Luis , Sánchez Marcos Jorge , Rodríguez‐Fernández Jesús , Arriortua María I. , Rojo Teófilo 
Published: February 2006

AbstractThe ordered double perovskite Sr2MnTeO6 was prepared by the freeze‐drying method. The nuclear and magnetic structures were determined by both X‐ray and neutron (D2B and D1B) powder diffraction. A distorted, double perovskite structure type described by the monoclinic P121/n1 space group is observed at room temperature and down to 4 K. The room temperature EPR spectrum shows an isotropic signal centered at a g value of 1.998 indicating that manganese ions are in the +2 oxidation state. At low temperature the EPR signal broadens as the exchange and dipolar interactions between Mn2+ cations increase. Below 25 K no signal is observed, indicating that the sample is magnetically ordered. The dc magnetic susceptibility shows the existence of antiferromagnetic interactions with an ordering temperature around 20 K. A sharp λ‐type anomaly observed at 19 K in the specific heat curve and refinement of low‐temperature neutron diffraction data confirm the presence of a three‐dimensional, antiferromagnetic ordered structure with an ordering temperature of ca. 23 K. The propagation vector of the magnetic structure is k = [0,0,0], yielding a type I antiferromagnetic ordering between Mn2+ (S = 5/2) cations. At 2 K, each manganese ion is antiferromagnetically aligned to 8 out of 12 nearest‐neighbors at an approximate distance of 5.6 Å. This magnetic structure can be viewed as being composed of ferromagnetic arrangement of Mn2+ moments in the ab plane, coupled antiferromagnetically along the c axis. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
Coordination Dependence of Magnetic Properties within a Family of Related [FeII2] Complexes of a Triazine‐Based Ligand
Authors: Quesada Manuel , de Hoog Paul , Gamez Patrick , Roubeau Olivier , Aromí Guillem , Donnadieu Bruno , Massera Chiara , Lutz Martin , Spek Anthony L. , Reedijk Jan 
Published: February 2006

AbstractThe coordination chemistry of the polydentate ligand 2,4,6‐tris(dipyridin‐2‐ylamino)‐1,3,5‐triazine (dpyatriz) with FeII has been explored, leading through variation of the counterion and the solvent system to the preparation of three different dinuclear complexes: [Fe2(dpyatriz)2(H2O)2(CH3CN)2](ClO4)4 (1), [Fe2(dpyatriz)2(H2O)2(CH3OH)2](BF4)4 (2) and [Fe2(dpyatriz)2Cl2](CF3SO3)2 (3). The X‐ray structure of these compounds has revealed that besides the difference in the noncoordinated anion, complex 1 differs from complex 2 only in the nature of the terminal ligands. Bulk magnetisation studies and Mössbauer spectroscopy have shown that such a subtle difference produces a change to the crystal field on the metal atoms, originating an important disparity of the magnetic behaviour. Thus, complex 1 experiences a partial spin crossover centred at approximately 265 K, whereas complex 2 shows two uncoupled high‐spin FeII centres over most of the studied temperature range, experiencing the effect of very weak antiferromagnetic coupling and/or single‐ion zero‐field splitting at low temperature. By contrast, complex 3, in which the triazine ring of dpyatriz is coordinated for the first time, displays (very uncommon) ferromagnetic coupling between both FeII ions within the molecule, leading to an S = 4 spin ground state. A fit of the experimental data led to a value of the coupling constant of J = +0.23 cm–1 (using H =–2JS1S2 as the convention for the exchange Hamiltonian) and provided an estimation of D = 0.63 cm–1 for the ground‐state axial zero‐field splitting parameter. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
The Influence of Ring Size on the Selectivity of Phosphorus Heterocycle Aminolysis in the Presence of Water or Alcohols – Case of 2‐Oxo‐ or 2‐Thioxo‐3‐sulfonyl‐1,3,2‐oxazaphosphorinanes
Authors: Dujols Frédéric , Mulliez Michel 
Published: February 2006

AbstractSeven phosphorus heterocycles 2 were synthesized in one step by condensing PIV dichlorides 3 with N‐sulfonyl‐3‐aminopropanols 4. In the presence of water, they react selectively with the less bulky amines. No change in selectivity of aminolysis was observed when using these six‐membered heterocycles 2 instead of their five‐membered analogs 1. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
Influence of the Number and Geometry of Binding Sites on Host–Guest Affinity: Imidazolium‐Substituted Receptor Molecules for Small Inorganic Anions
Authors: Fahlbusch Tilmann , Frank Markus , Schatz Jürgen , Schmaderer Harald 
Published: February 2006

AbstractThe influence of the number and relative geometry of the binding sites on the binding of spherical and tetragonal inorganic anions (Cl–, Br–, H2PO4–, and HSO4–) has been studied by using imidazolium salts based on benzene and calix[4]arenes. Binding constants in DMSO were found to be in the range of 200–2000 L mol–1. Three or four binding sites (2b–4b) lead to the nonselective binding of all anions indicating the decisive influence of the number of possible binding positions; binding constants of approximately 2000 for H2PO4–, 1000 for HSO4–, 900 for Cl–, and 800 L mol–1 for Br– were obtained. Benzene‐ (1b) and calixarene‐based (5b) bis(imidazolium) salts exhibited a high selectivity towards H2PO4–/HSO4– and Cl–/Br– indicating that for the complexation of H2PO4– and Cl– two binding sites are necessary, and for Br– and HSO4– at least three. In this case, selectivity could be obtained by simple variation of the number of identical binding positions.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
Palladium‐Catalyzed Suzuki–Miyaura Cross‐Coupling Using Phosphinous Acids and Dialkyl(chloro)phosphane Ligands
Authors: Wolf Christian , Ekoue‐Kovi Kekeli 
Published: February 2006

AbstractThe use of eleven palladium complexes having monomeric and μ‐chloro‐bridged dimeric structures and either bulky dialkyl‐ and diarylphosphinous acid ligands (POPd, POPd‐Br, POPd1, POPd2, POPd6, POPd7, Ph1‐Phoxide) or dialkyl(chloro)phosphane ligands (PXPd, PXPd2, PXPd6, PXPd7) for Suzuki–Miyaura coupling reactions has been evaluated. Screening and optimization of catalyst loading, solvent, temperature, and base showed that excellent results can be obtained with electron‐deficient and electron‐rich aryl iodides, bromides, and chlorides in the presence of 2.5 mol‐% of palladium–phosphinous acid POPd, (tBu2POH)2PdCl2, in 1,4‐dioxane using cesium carbonate as base. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
Recent Advances in Asymmetric Nitroso Diels–Alder Reactions
Authors: Yamamoto Yuhei , Yamamoto Hisashi 
Published: February 2006

AbstractDuring the past decade, the nitroso Diels–Alder (NDA) reaction has become more practical tool for organic synthesis, and a numbers of important compounds have been synthesized using this method. Until recently, no reports on a catalytic asymmetric version of this reaction had been reported; the major issues were the high reactivity of nitroso compounds and their chemical properties. This microreview outlines recent advances in the area of asymmetric NDA reaction following the review by Streith and Defoin in 1994. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
Infiltration pattern in a regolith–fractured bedrock profile: field observation of a dye stain pattern
Authors: Kim Jae Gon , Lee Gyoo Ho , Lee Jin‐Soo , Chon Chul‐Min , Kim Tack Hyun , Ha Kyoochul 
Published: February 2006

AbstractWe examined the infiltration pattern of water in a regolith–bedrock profile consisting of two overburdens (OB1 and OB2), a buried rice paddy soil (PS), two texturally distinctive weathered materials (WM1 and WM2) and a fractured sedimentary rock (BR), using a Brilliant Blue FCF dye tracer. A black‐coloured coating in conducting fractures in WM1, WM2 and BR was analysed by X‐ray diffraction and scanning electron microscopy. The dye tracer penetrated to greater than 2 m depth in the profile. The macropore flow and saturated interflow were the major infiltration patterns in the profile. Macropore flow and saturated interflow were observed along fractures in WM1, WM2 and BR and at the dipping interfaces of PS–WM1, PS–WM2 and PS–BR respectively. Heterogeneous matrix flow occurred in upper overburden (OB1) and PS. Compared with OB1, the coarser textured OB2 acted as a physical barrier for vertical flow of water. The PS with low bulk density and many fine roots was another major conducting route of water in the profile. Manganese oxide and iron oxide were positively identified in the black coating material and had low crystallinity and high surface area, indicating their high reactivity with conducting contaminants. Copyright © 2006 John Wiley & Sons, Ltd.
Relationship of topography to surface water chemistry with particular focus on nitrogen and organic carbon solutes within a forested watershed in Hokkaido, Japan
Authors: Ogawa Akiko , Shibata Hideaki , Suzuki Kei , Mitchell Myron J. , Ikegami Yoshiyuki 
Published: February 2006

AbstractWe studied the relationships between streamwater chemistry and the topography of subcatchments in the Dorokawa watershed in Hokkaido Island, northern Japan, to examine the use of topography as a predictor of streamwater chemistry in a watershed with relatively moderate terrain compared with other regions of Japan. Topographic characteristics of the Dorokawa watershed and its subcatchments were expressed as topographic index (TI) values, which ranged from 4·5 to 20·4 for individual grid cells (50 × 50 m2), but averaged from 6·4 to 7·4 for the 20 subcatchments. Streamwater samples for chemical analyses were collected four times between June and October 2002 from 20 locations in the watershed. The pH of water that passed through the watershed increased from ∼5·0 to 7·0, with major increases in Na+ and Ca2+ and marked decreases in NO3− and SO$_{4}^{2-}$. Distinctive spatial patterns were observed for dissolved organic carbon (DOC), dissolved organic nitrogen (DON), and NO3− concentrations of streamwater across the watershed. Statistical analyses indicated significant linear relationships between the average TI values of subcatchments and DOC, DON, and NO3− concentrations. Furthermore, the proportion of DOC in streamwaters in the wet season increased with TI values relative to other nitrogen species, whereas NO3− concentrations decreased with TI. The gradients of soil wetness and the presence of wetlands explained many of the observed spatial and temporal patterns of DOC, DON, and NO3− concentrations in the surface waters of the Dorokawa watershed. Our results suggest that the TI is especially useful for predicting the spatial distribution of DOC, DON and NO3− in the surface waters of Hokkaido, where topographical relief is moderate and wetlands more common than in other regions of Japan. Copyright © 2006 John Wiley & Sons, Ltd.
Accuracy and precision of different sampling strategies and flux integration methods for runoff water: comparisons based on measurements of the electrical conductivity
Authors: Schleppi Patrick , Waldner Peter A. , Fritschi Bruno 
Published: February 2006

AbstractBecause of their fast response to hydrological events, small catchments show strong quantitative and qualitative variations in their water runoff. Fluxes of solutes or suspended material can be estimated from water samples only if an appropriate sampling scheme is used. We used continuous in‐stream measurements of the electrical conductivity of the runoff in a small subalpine catchment (64 ha) in central Switzerland and in a very small (0·16 ha) subcatchment. Different sampling and flux integration methods were simulated for weekly water analyses. Fluxes calculated directly from grab samples are strongly biased towards high conductivities observed at low discharges. Several regressions and weighted averages have been proposed to correct for this bias. Their accuracy and precision are better, but none of these integration methods gives a consistently low bias and a low residual error. Different methods of peak sampling were also tested. Like regressions, they produce important residual errors and their bias is variable. This variability (both between methods and between catchments) does not allow one to tell a priori which sampling scheme and integration method would be more accurate. Only discharge‐proportional sampling methods were found to give essentially unbiased flux estimates. Programmed samplers with a fraction collector allow for a proportional pooling and are appropriate for short‐term studies. For long‐term monitoring or experiments, sampling at a frequency proportional to the discharge appears to be the best way to obtain accurate and precise flux estimates. Copyright © 2006 John Wiley & Sons, Ltd.
Air pollution and risk of lung cancer in a prospective study in Europe
Authors: Vineis Paolo , Hoek Gerard , Krzyzanowski Michal , Vigna‐Taglianti Federica , Veglia Fabrizio , Airoldi Luisa , Autrup Herman , Dunning Alison , Garte Seymour , Hainaut Pierre , Malaveille Christian , Matullo Giuseppe , Overvad Kim , Raaschou‐Nielsen Ole , Clavel‐Chapelon Francoise , Linseisen Jacob , Boeing Heiner , Trichopoulou Antonia , Palli Domenico , Peluso Marco , Krogh Vittorio , Tumino Rosario , Panico Salvatore , Bueno‐De‐Mesquita H. Bas , Peeters Petra H. , Lund E. Eylin , Gonzalez Carlos A. , Martinez Carmen , Dorronsoro Miren , Barricarte Aurelio , Cirera Lluis , Quiros J. Ramon , Berglund Goran , Forsberg Bertil , Day Nicholas E. , Key Tim J. , Saracci Rodolfo , Kaaks Rudolf , Riboli Elio 
Published: February 2006

AbstractTo estimate the relationship between air pollution and lung cancer, a nested case‐control study was set up within EPIC (European Prospective Investigation on Cancer and Nutrition). Cases had newly diagnosed lung cancer, accrued after a median follow‐up of 7 years among the EPIC exsmokers (since at least 10 years) and never smokers. Three controls per case were matched. Matching criteria were gender, age (±5 years), smoking status, country of recruitment and time elapsed between recruitment and diagnosis. We studied residence in proximity of heavy traffic roads as an indicator of exposure to air pollution. In addition, exposure to air pollutants (NO2, PM10, SO2) was assessed using concentration data from monitoring stations in routine air quality monitoring networks. Cotinine was measured in plasma. We found a nonsignificant association between lung cancer and residence nearby heavy traffic roads (odds ratio = 1.46, 95% confidence interval, CI, 0.89–2.40). Exposure data for single pollutants were available for 197 cases and 556 matched controls. For NO2 we found an odds ratio of 1.14 (95% CI, 0.78–1.67) for each increment of 10 μg/m3, and an odds ratio of 1.30 (1.02–1.66) for concentrations greater than 30 μg/m3. The association with NO2 did not change after adjustment by cotinine and additional potential confounders, including occupational exposures. No clear association was found with other pollutants. © 2006 Wiley‐Liss, Inc.
ErbB4 increases the proliferation potential of human lung cancer cells and its blockage can be used as a target for anti‐cancer therapy
Authors: Starr Alex , Greif Joel , Vexler Akiva , Ashkenazy‐Voghera Maia , Gladesh Valery , Rubin Chanan , Kerber Gabriele , Marmor Sylvia , Lev‐Ari Shahar , Inbar Moshe , Yarden Yosef , Ben‐Yosef Rami 
Published: February 2006

AbstractClinical and experimental data suggest that ErbB‐4, a member of the epidermal growth factor receptor family, may have a role in cancer progression and response to treatment. We found recently, using a retrospective clinical analysis, that expression of ErbB‐4 receptor is correlated with metastatic potential and patient survival in non‐small‐cell lung cancer (NSCLC). The purpose of this work was to correlate the expression of the ErbB‐4 and lung cancer cells growth in vitro and in vivo and to determine the therapeutic potential of a monoclonal antibody to ErbB‐4 against lung cancer. For this aim, we ectopically expressed ErbB‐4 in a human NSCLC cell line that did not express the ErbB‐4 protein. Overexpression of ErbB‐4 produced a constitutively activated ErbB‐4 receptor. The transfected ErbB‐4 positive clones showed an increased cell proliferation in vitro and in vivo in comparison with parental ErbB‐4 negative cells and with the cells transfected by neomycin‐resistant gene. A monoclonal antibody to ErbB‐4 showed both an inhibitory effect on growth rate and an increasing apoptotic rate in the cells expressing ErbB‐4. The results of the current study provide evidence that ErbB‐4 plays a significant role in human lung cancer and may serve as a molecular target for anticancer therapy. © 2006 Wiley‐Liss, Inc.
Observed parenting practices of first‐generation Latino families
Authors: Rodríguez Melanie Domenech , Davis Melissa R. , Rodríguez Jesús , Bates Scott C. 
Published: February 2006

AbstractThis study used an established behavioral observation methodology to examine the parenting practices of first‐generation Latino parents of children 4 to 9 years of age. The study had three central aims, to examine: (1) the feasibility of using a behavioral observation methodology with Spanish‐speaking immigrant families, (2) the utility of the Parent Peer Process Code (PPPC; Forgatch, Knutson, & Mayne, 1992) for coding parentñchild interactions, and (3) the relationship between observed parenting practices, as coded with the PPPC, and child outcomes. Families consisted of 48 fathers, 49 mothers, and 50 children. Families participated in cooperative, problem‐solving, and skillsbuilding tasks. The authors coded in five broad categories: problem solving, skills building, positive involvement, effective discipline, and monitoring. Findings show that the behavioral observation methodology is feasible to use with Spanish‐speaking immigrant families, that the PPPC is useful in understanding parentñchild interactions, and that the coded parentñchild interactions predict differential child outcomes. This information can help inform the development or adaptation of culturally sensitive parenting interventions to this underserved population. © 2006 Wiley Periodicals, Inc.
Parent–Child cultural marginalization and depressive symptoms in Asian American family members
Authors: Kim Su Yeong , Gonzales Nancy A. , Stroh Kunise , Wang Jenny Jiun‐Ling 
Published: February 2006

AbstractThe current study findings refute the recent claim that marginality theory lacks construct validity. Cultural marginalization is significantly related to depressive symptoms in Korean American, Chinese American, and Japanese American parents and adolescents living in the United States. Correlational analyses indicate that adolescents' depressive symptoms are significantly related to Asian and Asian American marginality scores, whereas mothers' and fathers' depressive symptoms are significantly related to their levels of Anglo and Asian American marginality. In a structural equation model, adolescents' Asian American marginalization and fathers' Anglo marginalization are significantly related to adolescents' depressive symptoms. It appears that marginality is a significant factor in the depressive symptoms of mothers, fathers, and adolescents. Furthermore, marginality scores of fathers and adolescents are both significant factors in adolescents' depressive symptoms.© 2006 Wiley Periodicals, Inc.
Family, community, and school influences on resilience among American Indian adolescents in the upper midwest
Authors: LaFromboise Teresa D. , Hoyt Dan R. , Oliver Lisa , Whitbeck Les B. 
Published: February 2006

AbstractThis study examines resilience among a sample of American Indian adolescents living on or near reservations in the upper Midwest. Data are from a baseline survey of 212 youth (115 boys and 97 girls) who were enrolled in the fifth through eighth grades. Based upon the definition of resilience, latent class analyses were conducted to identify youth who displayed pro‐social outcomes (60.5%) as opposed to problem behavior outcomes. A measure of family adversity was also developed that indicated only 38.4% of the youth lived in low‐adversity households. Defining resilience in the context of positive outcomes in the face of adversity, logistic regression was used to examine the predictors of pro‐social outcomes among youth who lived in moderate‐ to high‐adversity households. The analyses identified key risk and protective factors. A primary risk factor appeared to be perceived discrimination. Protective factors were from multiple contexts: family, community, and culture. Having a warm and supportive mother, perceiving community support, and exhibiting higher levels of enculturation were each associated with increased likelihood of pro‐social outcomes. © 2006 Wiley Periodicals, Inc.
Developing cultural competence in working with Korean immigrant families
Authors: Kim Irene J. , Kim Luke I. C. , Kelly James G. 
Published: February 2006

AbstractThe authors provide an in‐depth examination of the historical background, cultural values, family roles, and community contexts of Korean Americans as an aid to both researchers and clinicians in developing cultural competence with this particular group. First, the concept of cultural competence is defined. A brief history of Korean immigration patterns to the United States and demographic information about Korean Americans are reviewed. Second, Korean cultural values, family structure, and family roles are examined as they impact relationships in research and clinical contexts. Three indigenous concepts (cf. L. Kim, 1992) that may be useful in developing cultural competence include haan (suppressed anger), jeong (strong feeling of kinship), and noon‐chi (ability to evaluate social situations through implicit cues). Clinical case examples and accounts from a community‐based research perspective illustrate these cultural values. Third, important community resources in the Korean American context are highlighted. Links between cultural competence and “ecological pragmatism” (Kelly, Azelton, Burzette, & Mock, 1994) are discussed. © 2006 Wiley Periodicals, Inc.
Some guiding assumptions and a theoretical model for developing culturally specific preventions with Native American people
Authors: Whitbeck Les B. 
Published: February 2006

AbstractThis author proposes six basic assumptions to guide the development of prevention research partnerships between Native American communities and non‐Native American prevention researchers. He also presents a five‐stage theoretical model for the development of culturally specific prevention research. The theoretical model addresses the need for: (a) the cultural translation of key prevention constructs pertaining to risk and protective factors and (b) the development of measures of culturally specific risk and protective factors that will contribute to explained variance over and above that explained by traditional European models. “Cultural translation” refers to the process of adapting key variables to reflect their expression in specific social contexts. “Culturally specific risk and protective factors” refers to risk and protective factors unique to a specific culture, such as the protective effects of traditional spirituality and traditional activities in Native American cultures. The author concludes with short‐ and long‐term goals for prevention research in Native American communities. © 2006 Wiley Periodicals, Inc.