bluuebunny/crossref_metadata_2025_split huggingface dataset:
Solid State Conformational Features of Homodinuclear Nickel Complexes Double Bridged by Phosphate Esters and Related Ligands
Authors: Pérez José , García Luis , Carrascosa Ramón , Pérez Eduardo , Serrano Jose Luis , Sánchez Gregorio , García Gabriel , Santana Dolores , López Luisa , García Joaquí 
Published: August 2007

AbstractSolid state coordination geometry (distances, angles) in the titled complexes has been statistically characterized. Data have been extracted from the Cambridge Structural Database (CSD) and from three new crystal structures reported in this paper. The conformation adopted by the 8‐membered ring defined by nickel atoms and bridging ligands has been characterized by a probabilistic method in complexes [{NiL(μ‐O2P(OR)2)}2] (L = hydrotris(3,5‐dimethylpyrazolyl)borate, R = Me, Ph). The observed and ideal conformations have been studied by Molecular Mechanics. The strain energy calculated for the observed conformations is clearly lower, justifying their appearance in the solid state.
Synthesis, Structural Characterization and Electrochemical Studies of a Nicotinamide‐bridged Dinuclear Copper Complex derived from a Tridentate Hydrazone Schiff Base Ligand
Authors: Monfared Hassan Hosseini , Kalantari Zahra , Kamyabi Mohammad‐Ali , Janiak Christoph 
Published: August 2007

AbstractThe in‐situ formed hydrazone Schiff base ligand (E)‐N′‐(2‐hydroxy‐3‐methoxybenzylidene)benzohydrazide (H2L1) and nicotinamide (L2) give the copper(II) complex [CuL1L2] on reaction with copper(II) acetate. In the solid state two copper atoms are linked by nicotinamide through coordination with its pyridyl nitrogen atom and its amide‐C=O group to the dicopper(II) complex [CuL1(μ‐L2)CuL1L2]. The coordination polyhedra are a CuO2N2 square and a CuO3N2 square pyramide. Cyclic voltammetric experiments of the solution species [CuL1L2] in DMF reveal reduction of the L1 ligand at three potentials with a reduction at −0.5 V resulting in decomposition of the complex.
Cation Ordering and Electrical Properties of the Ruddlesden‐Popper Gd2−2xSr1+2xCo2O7 Compounds (x = 0 and 0.10)
Authors: Sánchez‐Andújar M. , Señarís‐Rodríguez M. A. 
Published: August 2007

AbstractWe report the structure and microstructure of the Ruddlesden‐Popper (RP) series n=2 Gd2−2xSr1+2xCo2O7 (x = 0 and 0.10). X‐ray powder diffraction, electron diffraction and HRTEM indicate that these compounds have a tetragonal structure (space group: P42/mnm) with cell parameters a ≈ 5.3749Å c ≈ 19.3591Å, in which the [CoO6] octahedra are distorted and tilted. Also, very interestingly, according to the obtained results these compounds presents A‐site cation ordering where the divalent and bigger Sr2+ cation selectively prefers the 12‐coordinated P site while the smaller and trivalent Gd3+ cation prefers the 9‐coordinated R site. From the electrical point of view these materials are semiconducting and their resistivitiy decreases upon doping. In addition, the highest doped sample presents a small magnetoresistive effect MRmax = −3.2 % under Hmax = 50 kOe at T = 55 K.
Magnetic Characteristics of Tetrabutylammonium Tetrahalogenoferrates(III): X‐ray Crystal Structure of Tetrabutylammonium Tetrabromoferrate(III)
Authors: Wyrzykowski Dariusz , Kruszyński Rafał , Kłak Julia , Mroziński Jerzy , Warnke Zygmunt 
Published: August 2007

AbstractThe crystal and molecular structure of tetrabutylammonium tetrabromoferrate(III) was determined. The iron cation is surrounded by four bromide anions, and it adopts a slightly distorted tetrahedral coordination with two angles larger than tetrahedral, one equal to tetrahedral and one smaller than tetrahedral. In the structure there are no hydrogen bonds nor any unusual short intermolecular interactions. The compound is isostructural with its [FeBr4−nCln]− (n = 0, 1, 3, 4) analogues. Magnetic measurements of the powdered samples of [(C4H9)4N][FeBr4−nCln] gave negative values of the Weiss constants that suggest antiferromagnetic interactions transmitted within the crystal lattice.
Nd3N2SeBr: Ein neues Nitridselenidbromid des Neodyms mit $\rm ^{1}_{\infty}\{[N_{2}Nd_{3}]^{3+}\}$‐Strängen aus hochkondensierten [NNd4]9+‐Tetraedern
Authors: Lissner Falk , Schleid Thomas 
Published: August 2007

AbstractNd3N2SeBr: A New Nitride Selenide Bromide of Neodymium with $\rm ^{1}_{\infty}\{[N_{2}Nd_{3}]^{3+}\}$ Strands of Highly Condensed [NNd4]9+ TetrahedraThe oxidation of neodymium powder with selenium and sodium azide (NaN3) in the presence of neodymium tribromide (NdBr3) yields neodymium nitride selenide bromide with the composition Nd3N2SeBr when appropriate molar ratios of the reactants are used. Additional sodium bromide (NaBr) as a flux secures fast reactions (7 d) at 900 °C in evacuated silica tubes as well as the formation of dark brown single crystals. The orthorhombic crystal structure (Pnma, Z = 4) was determined from single crystal X‐ray diffraction data (a = 1288.13(9), b = 405.22(3), c = 1206.29(8) pm). There are three crystallographically different Nd3+ cations present. Nd1 resides in eightfold coordination of four N3−, two Se2− and two Br− anions forming a square antiprism and Nd2 is coordinated by three N3−, one Se2− and three Br− in the shape of a monocapped trigonal prism. Finally, an octahedral coordination sphere of one N3−, three Se2− and two Br− anions surrounds Nd3. However, the main feature in the crystal structure comprises N3−‐centred (Nd3+)4 tetrahedra arranged as chains $\rm ^{1}_{\infty}\{[NNd_{2}]^{3+}\}$ of cis‐edge connected [NNd4]9+ units first, which are further connected via two more edges to form strands $\rm ^{1}_{\infty}\{[N_{2}Nd_{3}]^{3+}\}$ of highly condensed all‐cisoid oriented [NNd4]9+ tetrahedra. They get bundled along [010] like a hexagonal rod packing and are held together by two radiographically indistinguishable Se2− and Br− anions, which thereby also achieve the charge balance.
Dimensional Reduction in Alkali Metal Uranyl Molybdates: Synthesis and Structure of Cs2[(UO2)O(MoO4)]
Authors: Alekseev Evgeny V. , Krivovichev Sergey V. , Armbruster Thomas , Depmeier Wulf , Suleimanov Evgeny V. , Chuprunov Evgeny V. , Golubev Alexei V. 
Published: August 2007

AbstractA new uranyl molybdate, Cs2[(UO2)O(MoO4)] (1), has been prepared by high‐temperature solid‐state reactions. The structure has been solved by direct methods and refined to R1 = 0.0284 for |F0| ≥4σF. The compound 1 is orthorhombic, Pca21, a = 12.018(2), b = 12.438(2), c = 17.917(3) Å, V = 2678.2(7) Å3, Z = 12. The structure of 1 is based upon one‐dimensional chains consisting of corner‐sharing UO6 and MoO4 polyhedra. The UO6 square bipyramids share cis equatorial vertices to form zigzag chains that are further stabilized by bidendate MoO4 tetrahedra. The chains have composition [(UO2)O(MoO4)]2− and are oriented parallel to the c axis. In the structure, adjacent chains form pseudo‐2D‐layers parallel to (010). The Cs+ cations are in between the pseudolayers. The composition‐structure relationships in alkali metal uranyl molybdates can be rationalized from the viewpoint of dimensional reduction using the following assumptions: (1) representation of the AxUnMomOy formula (n ≤ m) as a sum of UMoO6 (= UO2MoO4), A2O, and A2MoO4 (A = alkali metal): AxUnMomOy = kA2O + nUMoO6 + (m‐n)A2MoO4, where x = 2(k + m − n) and y = k + 2n + 4m; (2) analysis of the dimensionality of uranyl molybdate structural units and its changes upon incorporation of ionic reagents A2O and A2MoO4 into a parent framework of UO2MoO4 that consists of 3‐D array of U and Mo based polyhedra. The relationships between different compositions and structures may be visualized using the UO2MoO4–A2O–A2MoO4 compositional diagram. The observed trends of decreasing dimensionality of the uranyl molybdate units allow to specify on this diagram fields of dimensionality.
Inkommensurabel modulierte Kristallstrukturen und Phasenumwandlungen – Die Verbindungen SrPt2As2 und EuPt2As2
Authors: Imre Anette , Hellmann Andrea , Wenski Guido , Graf Jürgen , Johrendt Dirk , Mewis Albrecht 
Published: August 2007

AbstractModulated Crystal Structures and Phase Transitions – The Compounds SrPt2As2 and EuPt2As2The new compounds SrPt2As2 (a = 4.482(1), b = 4.525(1), c = 9.869(2) Å) and EuPt2As2 (a = 4.435(2), b = 4.467(2), c = 9.784(3) Å) have been prepared by reaction of the elements at 1050 °C. Satellite reflections observed in X‐ray diffraction experiments on single crystals revealed that both compounds have modulated crystal structures at room temperature. The average structures can be derived from the CaBe2Ge2 type and described in the orthorhombic space group Pmmn (Z = 2) with splitted positions for half the Pt and As atoms. Based on the average structure of SrPt2As2, the modulated structure has been solved and refined using the (3+1)‐dimensional superspace group Pmmn(α00)0s0 and a modulation vector q = 0,62·a*. The modulation appears in the layers of the PtAs4 tetrahedra with occupational and displacive components. The other atoms are also slightly affected by the modulation. With increasing pressure, SrPt2As2 undergoes a phase transition at about 60 kbar. The crystal structure of the high pressure phase (HP‐SrPt2As2: a = 9.752(2), b = 4.398(1), c = 8.727(2) Å, β = 90.34(3)°; 66(5) kbar) is a monoclinic variant (P21/c; Z = 4) of the tetragonal CaBe2Ge2 type known from EuPt2Ge2. Band structure calculations reveal that a Peierls‐distortion within the Pt square nets is a reason for the structural instabilities in SrPt2As2. The satellite reflections of EuPt2As2 become weaker with increasing temperature and disappear above 200 °C. The high temperature phase (HT‐EuPt2As2: a = 4.464(1), c = 9.832(1) Å; 350 °C) crystallizes with the CaBe2Ge2 type (P4/nmm; Z = 2). High thermal displacement parameters of the Pt and As atoms of the PtAs4 tetrahedra cover the effects of the modulation at room temperature. Several analogous compounds were studied by X‐ray diffraction resulting in the following lattice parameters: a = 4.564(1), c = 10.021(2) Å for BaPt2As2, a = 4.603(2), c = 10.565(2) Å for SrPt2Sb2, a = 4.630(2), b = 4.683(2), c = 10.389(3) Å for EuPt2Sb2, and a = 4.458(1), c = 9.823(2) Å for SrIr2As2.
IGF‐I and INS receptor expression in the salivary glands of diabetic Nod mice submitted to long‐term insulin treatment
Authors: Caldeira Eduardo José , Cagnon Valéria Helena Alves 
Published: August 2007

AbstractThis work aimed to characterize the IGF‐I and INS receptor expression in the salivary glands of Nod mice, correlating to therapeutic effects of insulin treatment on these receptors. Nod mice were divided into: Groups 1 and 2 (diabetic), Groups 3 and 4 (diabetic with insulin treatment) and Group 5 (non‐diabetic). Fragments from the salivary glands were processed for immunohistochemical analysis. The results showed that the prolonged diabetic state led to a steadily increased IGF‐I receptor expression. INS receptor expression was gradually decreased. It was concluded that not only was the IGF‐I receptor expression affected by the diabetic state but also the INS receptor expression. The period of the diabetic state was directly related to changes in the expression of these receptors. In spite of the insulin treatment having recovered the glycaemic levels, the expression of INS and the IGF‐I receptors did not reach the standard level, which certainly hampered glandular function.
Relation between dose of loop diuretics and outcomes in a heart failure population: Results of the ESCAPE Trial
Authors: Hasselblad Vic , Stough Wendy Gattis , Shah Monica R. , Lokhnygina Yuliya , O'Connor Christopher M. , Califf Robert M. , Adams Kirkwood F. 
Published: August 2007

AbstractBackground:We examined the relation of maximal in‐hospital diuretic dose to weight loss, changes in renal function, and mortality in hospitalised heart failure (HF) patients.Methods:In ESCAPE, 395 patients received diuretics in‐hospital. Weight was measured at baseline, discharge, and every other day before discharge. Weight loss was defined as the difference between baseline and last in‐hospital weight. Mortality was assessed using a log‐logistic model with non‐zero background.Results:Median weight loss: 2.8kg (0.7, 6.1); mean: 3.7kg (22% of values <0). Weight loss and maximum in‐hospital dose were correlated (p=0.0007). Baseline weight, length of stay, and baseline brain natriuretic peptide were significant predictors of weight loss. After adjusting for these, dose was not a significant predictor of weight loss. A strong relation between dose and mortality was seen (p=0.003), especially at >300mg/day. Dose remained a significant predictor of mortality after adjusting for baseline variables that significantly predicted mortality. Correlation between maximal dose and creatinine level change was not significant (r=0.043; p=0.412)Conclusions:High diuretic doses during HF hospitalisation are associated with increased mortality and poor 6‐month outcome.
Prostamides (prostaglandin‐ethanolamides) and their pharmacology
Authors: Woodward D F , Liang Y , Krauss A H‐P 
Published: August 2007

The prostamides are part of a large and continually expanding series of pharmacologically unique neutral lipids. They are COX‐2 derived oxidation products of the endocannabinoid/endovanniloid anandamide. Prostamide pharmacology is unique and, as in the case of the endocannabinoids anandamide and 2‐arachidonylglycerol, bears little resemblance to that of the corresponding free acids. By virtue of its close relationship to the anti‐glaucoma drug bimatoprost, prostamide F2αhas received the greatest research attention. Prostamide F2αand bimatoprost effects appear independent of prostanoid FP receptor activation, according to a litany of agonist studies. Studies involving freshly isolated and separate feline iridial smooth muscle cells revealed that bimatoprost and FP receptor agonists stimulated different cells, without exception. This suggests the existence of receptors that preferentially recognize prostamide F2α. The recent discovery of prostamide antagonists has provided further support for prostamide receptors as discrete entities. The prototypical prostamide antagonists, AGN 204396 and 7, blocked the effects of prostamide F2αand bimatoprost but not those of PGF2αand FP receptor agonists in the feline iris. Second generation more potent prostamide antagonists, such as AGN 211334, should allow the role of prostamides in health and disease to be elucidated. From the therapeutics standpoint, the prostamide F2αanalogue bimatoprost is the most efficacious ocular hypotensive agent currently available for the treatment of glaucoma.British Journal of Pharmacology(2008)153, 410–419; doi:10.1038/sj.bjp.0707434; published online 27 August 2007
A review of feature selection techniques in bioinformatics
Authors: Saeys Yvan , Inza Iñaki , Larrañaga Pedro 
Published: August 2007

AbstractFeature selection techniques have become an apparent need in many bioinformatics applications. In addition to the large pool of techniques that have already been developed in the machine learning and data mining fields, specific applications in bioinformatics have led to a wealth of newly proposed techniques.In this article, we make the interested reader aware of the possibilities of feature selection, providing a basic taxonomy of feature selection techniques, and discussing their use, variety and potential in a number of both common as well as upcoming bioinformatics applications.Contact: yvan.saeys@psb.ugent.beSupplementary information: http://bioinformatics.psb.ugent.be/supplementary_data/yvsae/fsreview
LICORN: learning cooperative regulation networks from gene expression data
Authors: Elati Mohamed , Neuvial Pierre , Bolotin-Fukuhara Monique , Barillot Emmanuel , Radvanyi François , Rouveirol Céline 
Published: August 2007

AbstractMotivation: One of the most challenging tasks in the post-genomic era is the reconstruction of transcriptional regulation networks. The goal is to identify, for each gene expressed in a particular cellular context, the regulators affecting its transcription, and the co-ordination of several regulators in specific types of regulation. DNA microarrays can be used to investigate relationships between regulators and their target genes, through simultaneous observations of their RNA levels.Results: We propose a data mining system for inferring transcriptional regulation relationships from RNA expression values. This system is particularly suitable for the detection of cooperative transcriptional regulation. We model regulatory relationships as labelled two-layer gene regulatory networks, and describe a method for the efficient learning of these bipartite networks from discretized expression data sets. We also evaluate the statistical significance of such inferred networks and validate our methods on two public yeast expression data sets.Availability: http://www.lri.fr/~elati/licorn.htmlContact: mohamed.elati@curie.frSupplementary information: Supplementary data are available at Bioinformatics online.
Current status and temporal trends in stocks of European eel in England and Wales
Authors: Bark A. , Williams B. , Knights B. 
Published: August 2007

Abstract
Bark, A., Williams, B., and Knights, B. 2007. Current status and temporal trends in stocks of European eel in England and Wales. – ICES Journal of Marine Science, 64: –. An extensive 4-year programme of catchment surveys, data collection, and model development for eels was undertaken to establish the status of the stocks in England and Wales, so that appropriate management action can be taken. Nine test catchments representing different geographical areas and catchment types were studied, covering 14 rivers, two estuaries, and a fresh-water lagoon. Data were collected via electric fishing, fykenetting, fixed eel racks, and elver traps. In all, 13 500 eels were caught, weighed, and measured, and the sex and age of a subsample of 1400 determined. Despite declining recruitment, eel stocks in some, perhaps many, west coast rivers are probably still at or near to carrying capacity, with male-dominated populations. In other rivers, particularly those towards the southeast of England, current and historical data indicate declining female-dominated stocks. For rivers where recruitment is not limiting, there appears to be a direct relationship between the standing stock of eels and the mean nitrate level. This relationship potentially facilitates the application of a biomass-based biological reference point for eels for application to individual catchments. The data also suggest that it may be possible to develop reference points based on mean eel length or sex ratio.
Eels: contaminant cocktails pinpointing environmental contamination
Authors: Belpaire C. , Goemans G. 
Published: August 2007

Abstract
Belpaire, C., and Goemans, G. 2007. Eels: contaminant cocktails pinpointing environmental contamination. – ICES Journal of Marine Science, 64: –. There is growing concern that insufficient somatic and health conditions of silver European eels (Anguilla anguilla) emigrating from European waters to oceanic spawning areas might be a key causative factor in the decline of the stock. One factor that could contribute to deterioration in the status of eels is high contaminant accumulation in their body. Contaminants may affect lipid metabolism and result in lower energy stores. A high body burden of contaminants and low energy stores might be responsible for failure of migration and/or impairment of successful reproduction. During a 12-year study on a relatively small area within the river basins of IJzer, Scheldt, and Meuse (ca. 13 500 km2), 2613 eels were sampled covering a dense monitoring network of 357 stations. Eels were analysed for ca. 100 chemicals. These included PCBs, organochlorine pesticides, heavy metals, brominated flame retardants, volatile organic pollutants (VOCs), endocrine disruptors, dioxins, perfluorooctane sulphonic acids (PFOSs), metallothioneins, and polycyclic aromatic compounds. This series represents only a very small fraction (<0.5%) of the >30 000 chemicals currently marketed and used in Europe. The biomonitoring value of eels as a tool for monitoring environmental contamination is illustrated. Two major conclusions were drawn: (i) the eel is a highly suitable biomonitor for environmental contaminants, for both local and international purposes, e.g. to evaluate the chemical status for the Water Framework Directive, and (ii) dependent on the degree of pollution in their habitat, the levels of certain contaminants reported in yellow eels can be high, and might affect their potential for reproduction.
The feasibility of escape mechanisms in conical snow crab traps
Authors: Winger Paul D. , Walsh Philip J. 
Published: August 2007

Abstract
Winger, P. D., and Walsh, P. J. 2007. The feasibility of escape mechanisms in conical snow crab traps. – ICES Journal of Marine Science, 64: 1587–1591. Laboratory observations and morphometric measurements of snow crab (Chionoecetes opilio) were conducted to examine the feasibility of incorporating rigid escape mechanisms into conical snow crab traps to improve trap selectivity. Under laboratory conditions, undersized adolescent male snow crab (≤94 mm carapace width) were capable of detecting, approaching, and interacting with escape mechanisms, and the location of the mechanisms was important in determining the likelihood of escape success. Escape mechanisms mounted low on the exterior wall of the trap received more than three times the number of penetration attempts than those mounted higher, although successful escape rates were very low. There was no difference in behaviour or escape success between traditional mesh traps and experimental wire (Aquamesh®) traps fitted with escape mechanisms. Morphometric measurements suggest that an escape diameter of 95 mm would optimize the egress of small crab and prevent the loss of legal-sized crab.
Flavonoids Are Differentially Taken Up and Transported Long Distances in Arabidopsis
Authors: Buer Charles S. , Muday Gloria K. , Djordjevic Michael A. 
Published: August 2007

Abstract
Flavonoids are synthesized in response to developmental and environmental signals and perform many functions in plants. Arabidopsis (Arabidopsis thaliana) roots grown in complete darkness do not accumulate flavonoids since the expression of genes encoding enzymes of flavonoid biosynthesis is light dependent. Yet, flavonoids accumulate in root tips of plants with light-grown shoots and light-shielded roots, consistent with shoot-to-root flavonoid movement. Using fluorescence microscopy, a selective flavonoid stain, and localized aglycone application to transparent testa mutants, we showed that flavonoids accumulated in tissues distal to the application site, indicating uptake and movement systems. This was confirmed by time-course fluorescence experiments and high-performance liquid chromatography. Flavonoid applications to root tips resulted in basipetal movement in epidermal layers, with subsequent fluorescence detected 1 cm from application sites after 1 h. Flavonoid application to midroot or cotyledons showed movement of flavonoids toward the root tip mainly in vascular tissue. Naringenin, dihydrokaempferol, and dihydroquercetin were taken up at the root tip, midroot, or cotyledons and traveled long distances via cell-to-cell movement to distal tissues, followed by conversion to quercetin and kaempferol. In contrast, kaempferol and quercetin were only taken up at the root tip. Using ATP-binding cassette (ABC) transporter and H+-ATPase inhibitors suggested that a multidrug resistance-associated protein ABCC transporter facilitated flavonoid movement away from the application site.