bluuebunny/crossref_metadata_2025_split huggingface dataset:
π‐Stacking Modulates the Luminescence of [(dppz)Ni(Mes)Br] (dppz = dipyrido[3,2‐a:2′,3′‐c]phenazine, Mes = 2,4,6‐trimethylphenyl)
Authors: Klein Axel , Hurkes Natascha , Kaiser André , Wielandt Wolfram 
Published: July 2007

AbstractThe red colour of the novel organonickel complex [(dppz)Ni(Mes)Br] (dppz = dipyrido[3,2‐a:2′,3′‐c]phenazine, Mes = 2,4,6‐trimethylphenyl) originates from long‐wavelength MLCT/L′LCT charge transfer bands. However, luminescence in dilute solution comes presumably from the 3π‐π* (phenazine) excited state. The red‐shifted emission exhibited in concentrated solutions is assigned to dimers. In the solid state emission is quenched. The crystal structure reveals two different types of π‐π stacking along the crystallographic a axis.
[P4N4F8NMe2]− – An Aminophosphazenate Ion
Authors: Kingston Melanie , Lork Enno , Mews Rüdiger 
Published: July 2007

AbstractTAS+[P4N4F8NMe2]− (2) was prepared from TAS+[P4N4F9]− (1) via F/NMe2 exchange using Me3SiNMe2. The salt was characterised by nmr‐spectroscopy and by X‐ray crystallography. The bonding situation in the anion is briefly discussed. The structural properties of the anion are compared with those of the starting material.
Neue Zinn‐reiche Stannide der Systeme AII‐Al‐Sn (AII = Ca, Sr, Ba)
Authors: Wendorff Marco , Röhr Caroline 
Published: July 2007

AbstractNew Tin‐rich Stannides of the Systems AII‐Al‐Sn (AII = Ca, Sr, Ba)Four new tin‐rich intermetallics of the ternary systems Ca/Sr/Ba‐Al‐Sn were synthesized from stoichiometric amounts of the elements at maximum temperatures of 1200 °C. Their crystal structures, representing two new types, have been determined using single crystal x‐ray diffraction. Close to the 1:1 composition, the structures of the two isotypic compounds A18[Al4(Al/Sn)2Sn4][Sn4][Sn]2 (overall composition A9M8; A = Sr/Ba, tetragonal, space group P4/mbm, a = 1325.9(1)/1378.6(1), c = 1272.8(2)/1305.4(1) pm, Z = 4, R1 = 0.0430/0.0293) contain three different anionic Sn/Al building units: Isolated Sn atoms (motif I) coordinated by the alkaline earth cations only (comparable to Ca2Sn), linear Sn chains (II), which are comparable to the anions in trielides related to the W5Si3 structure type and finally octahedral clusters [Al4M2Sn4] (III), composed of four Al atoms forming the center plane, two statistically occupied Al/Sn atoms at the apexes and four exohedral Sn attached to Al. Close to the AM2 composition, two isotypic tin‐rich intermetallics A9[Al3Sn2][(Sn/Al)4]Sn6 (overall composition A9M15; A = Ca/Sr; space group C2/m, a = 2175.2(1)/2231.0(2), b = 1210.8(1)/1247.0(1), c = 1007.4(1)/1042.0(2) pm, β = 103.38(1)/103.42(1)°, Z = 2, R1 = 0.0541/0.0378) are formed. Their structure is best described as a complex three‐dimensional network, that can be considered to consist of the building units of the binary border phases too, i.e. linear zig‐zag chains of Sn (motif I) like in CaSn, ladders of four‐bonded Sn/Al atoms (II) like in SrAl2 and trigonal‐bipyramidal clusters [Al3Sn2] (III) also present in Ba3Al5. Despite the complex structures, some statistically occupied Al/Sn positions and the small disorder of one building unit, the bonding in both structure types can be interpreted using the Zintl concept and Wade's electron counting rules when taking partial Sn‐Sn bonds into account.
Bi53+‐Polykationen in geordneten und plastischen Kristallen von Bi5[AlI4]3 und Bi5[AlBr4]3
Authors: Ruck Michael , Steden Folker 
Published: July 2007

AbstractBi53+ Polycations in Ordered and Plastic Crystals of Bi5[AlI4]3 and Bi5[AlBr4]3Dark‐red air‐sensitive crystals of pentabismuth‐tris(tetrabromoaluminate) Bi5[AlBr4]3 and black crystals of Bi5[AlI4]3 have been crystallized from melts of Bi, BiX3 and AlX3 (X = Br, I). X‐ray diffraction on a single crystal of Bi5[AlI4]3 (T = 293(2) K; space group Pnma; a = 2143.6(3) pm, b = 1889.1(1) pm, c = 811.74(5) pm) revealed an ordered packing of Bi53+ trigonal bipyramids and [AlI4]− tetrahedra that corresponds to the PuBr3 structure type. Contrary to the so far known Bi53+ polycations with accurate D3h symmetry, the bismuth cluster found in Bi5[AlI4]3 holds only Cs symmetry. The room temperature structure of the tetrabromoaluminate Bi5[AlBr4]3, which is related to the AuCu3 type, shows a dynamic disorder of the Bi53+ polycations (T = 293(2) K; space group $Fm{\bar 3}c$; a = 1766.2(3) pm). Slight cooling induces the transition into an ordered rhombohedral phase isostructural to Bi5[AlCl4]3 (T = 260(2) K; space group $R{\bar 3}c$ a = 1241.5(8) pm, c = 3041(2) pm).
Redox‐Reaktion und Gasphasenabscheidung im System In/Mn/O
Authors: Möller Angela , Schmidt Peer , Fastje Oliver 
Published: July 2007

AbstractRedox Reaction and Gas Phase Precipitation in the System In/Mn/OThe oxidation of manganese metal with In2O3 occurs at approximately 973 K in evacuated silica ampoules. Thereby, the vapour transport species In2O(g) is being formed, which decomposes to indium metal and In2O3 at lower temperatures. Thermodynamic data as well as a description of the transport mechanism is given.
A Novel 2‐D Copper(II) Complex with Paddlewheel‐like Building Block
Authors: Zhao Hong‐Kun , Ding Bin , Yang En‐Cui , Wang Xiu‐Guang , Zhao Xiao‐Jun 
Published: July 2007

AbstractBy reaction of CuCl2 with H4btc (H4btc = 1,2,4,5‐benzenetetracarboxylic acid) in mixed N,N‐dimethylformamide (DMF) and methanol solution, a new two‐dimensional (2‐D) copper(II) complex [Cu(btc)0.5(DMF)]n (1) based on the paddlewheel‐like [Cu2(‐CO2)4(DMF)2] building blocks has been synthesized, which is different from those previous Cu‐btc(II) coordination polymers obtained in water medium. Four carboxylate groups of (btc)4− anion in 1 consistently exhibit bidentate bridging coordination mode, affording an unusual coordination mode of (btc)4−. Further analysis indicates C–H···π weak interactions are the primary driving forces to assemble the 2‐D layers of 1 into a 3‐D packing structure.
Morpholino‐Functionalized and Heteroaryl‐Substituted Titanocene Anti‐Cancer Drugs: Synthesis and Cytotoxicity Studies
Authors: Pampillón Clara , Claffey James , Hogan Megan , Tacke Matthias 
Published: July 2007

AbstractFrom the carbolithiation of 6‐morpholino fulvene (3a) and different ortho‐lithiated heterocycles (furan, thiophene and N‐methylpyrrole), the corresponding lithium cyclopentadienide intermediate (4a–c) was formed. These three lithiated intermediates underwent a transmetallation reaction with TiCl4 resulting in morpholino‐functionalised titanocenes 5a–c. When these titanocenes were tested against LLC‐PK cells, the IC50 values obtained were of 58, 63 and 115 μM for titanocenes 5a–c respectively. The most cytotoxic titanocene 5a with an IC50 value of 58 μM is found to be approximately 20 times less cytotoxic than cis‐platin, which showed an IC50 value of 3.3 μM, when tested on the LLC‐PK cell line, and 10 times less cytotoxic than its dimethylamino‐functionalised analogue (Titanocene C, IC50 = 5.5 μM).
Substitution Effects in Zintl Phases: Synthesis and Crystal Structure of the Novel Phases Ae3Sn4−xBi1+x (x ≤ 1; Ae = Sr, Ba) Containing Shubnikov‐Type Nets $^{2}_{\infty}\rm [Sn_{4-x}Bi_{x}]$
Authors: Ponou Siméon , Kim Sung‐Jin , Fässler Thomas F. 
Published: July 2007

AbstractThe compounds Ae3Sn4−xBi1+x (Ae = Sr, Ba) with x < 1 have been synthesized by solid‐state reactions in welded Nb tubes at high temperature. Their structures were determined by single crystal X‐ray diffraction studies to be tetragonal; space group I4/mcm (No. 140); Z = 4, with a = 8.968(1) Å, c = 12.859(1) Å for Sr3Sn3.36Bi1.64(3) (1) and a = 9.248(2), c = 13.323(3) Å for Ba3Sn3.16Bi1.84(3) (2). The structure consists of two interpenetrating networks formed by a 3D Ae6/2Bi substructure (anti‐ReO3 type) forming the host, and layers of interconnected four‐member units [Sn4−xBix] with “butterfly”‐like shape as the guest. According to the Zintl‐Klemm concept, the compounds are slightly electron deficient and will be charge balanced for x = 1. The electronic structures of Ae3Sn4−xBi1+x calculated by the TB‐LMTO‐ASA method indicate that the compounds correspond to ideal semiconducting Zintl phases with a narrow band gap for x = 1 (zero‐gap semiconductor). The origin of the slight deviation from the optimal electron count for a valance compound is discussed.
Synthesis and Molecular Structure of Two Zinc Complexes of 1,2‐Bis[(trimethylsilyl)imino]acenaphthene
Authors: Fedushkin Igor L. , Skatova Alexandra A. , Eremenko Olga V. , Hummert Markus , Schumann Herbert 
Published: July 2007

AbstractThe reaction of 1,2‐bis[(trimethylsilyl)imino]acenaphthene (1, tms‐BIAN) with ZnCl2 and ZnI2 in THF and Et2O afford (tms‐BIAN)ZnCl2 (2) and (tms‐BIAN)ZnI2 (3), respectively. The compounds 2 and 3 were characterized by IR‐ and NMR spectroscopy as well as by single crystal X‐ray analysis.
Effect of Antioxidant Treatments on the Gut–Liver Axis Oxidative Status and Function in Bile Duct‐Ligated Rats
Authors: Assimakopoulos Stelios F. , Maroulis Ioannis , Patsoukis Nikolaos , Vagenas Konstantinos , Scopa Chrisoula D. , Georgiou Christos D. , Vagianos Constantine E. 
Published: July 2007

AbstractBackgroundExperimental and clinical studies have demonstrated the pivotal role of oxidative stress in the promotion of hepatic and intestinal injury in obstructive jaundice. The present study was undertaken to investigate the effect of well known antioxidant treatments on the gut–liver axis oxidative status and function in bile duct‐ligated rats.MethodsA total of 60 male Wistar rats were randomly divided into six groups of 10 animals each: controls, sham operated, bile duct ligated (BDL), and BDL treated with either N‐acetylcysteine (NAC), allopurinol, or α‐tocopherol (α‐TC). Ten days after treatment, the hepatic and intestinal oxidative status was estimated by measuring lipid peroxidation and a battery of biochemical markers comprising the organ’s thiol redox state (i.e., glutathione, cysteine, protein thiols, oxidized glutathione, nonprotein mixed disulfides, oxidized cysteine derivatives, protein symmetrical disulfides, and protein mixed disulfides). Portal and aortic endotoxin concentrations and alanine aminotransferase (ALT) levels were also determined.ResultsAll antioxidant treatments significantly improved intestinal barrier function and protected from cholestatic liver injury, as evidenced by reduction of the portal and aortic endotoxin concentration and ALT levels, respectively. This effect accompanied their significant antioxidant action in both organs, mediated by a certain influence profile on the thiol redox state by each treatment.ConclusionNAC, allopurinol, and α‐TC, exerting a potent combined antioxidant effect on the intestine and liver in experimental obstructive jaundice, significantly prevented intestinal barrier dysfunction and liver injury. The variety of results depending on the antioxidant agent that was administered and the marker of oxidative stress that was estimated, indicates that a battery of biomarkers would be more appropriate in assessing pharmacologic responses to therapeutic interventions.
Relationship between plant species diversity and soil microbial functional diversity along a longitudinal gradient in temperate grasslands of Hulunbeir, Inner Mongolia, China
Authors: Liu Zhanfeng , Liu Guohua , Fu Bojie , Zheng Xiaoxuan 
Published: July 2007

AbstractNumerous experiments have been established to examine the effect of plant diversity on the soil microbial community. However, the relationship between plant diversity and microbial functional diversity along broad spatial gradients at a large scale is still unexplored. In this paper, we examined the relationship of plant species diversity with soil microbial biomass C, microbial catabolic activity, catabolic diversity and catabolic richness along a longitudinal gradient in temperate grasslands of Hulunbeir, Inner Mongolia, China. Preliminary detrended correspondence analysis (DCA) indicated that plant composition showed a significant separation along the axis 1, and axis 1 explained the main portion of variability in the data set. Moreover, DCA‐axis 1 was significantly correlated with soil microbial biomass C (r= 0.735,P= 0.001), microbial catabolic activity (average well color development;r= 0.775,P< 0.001) and microbial functional diversity (catabolic diversity:r= 0.791,P< 0.001 and catabolic richness:r= 0.812,P< 0.001), which suggested thatsome relationship existed between plant composition and the soil microbial community along the spatial gradient at a large scale. Soil microbial biomass C, microbial catabolic activity, catabolic diversity and catabolic richness showed a significant, linear increase with greater plant species richness. However, many responses that we observed could be explained by greater aboveground plant biomass associated with higher levels of plant diversity, which suggested that plant diversity impacted the soil microbial community mainly through increases in plant production.
Diversity and composition of larger moths in three different forest types of Southern Korea
Authors: Choi Sei‐Woong 
Published: July 2007

AbstractMoth assemblages in three habitat types were investigated to find differences in species richness and abundances and to find any specific moth group(s) in each habitat. Study areas were in southern Korea: lowlands of Muan‐county, Jeollanam‐do Province and mid‐elevations to highlands of Mt. Jirisan National Park. Moth monitoring, conducted at eight sites, was comprised of three habitat types—native forest, regenerative forest and rural landscape. A total of 4,803 individuals, consisting of 583 species in 362 genera, were identified. Species richness did not differ significantly by habitat type or elevation. ANOVA indicated that site, location and elevation significantly affected the species abundances of Drepanidae, Epiplemidae, Limacodidae, Noctuidae and Zygaenidae, while habitat type was not a significant factor. The moth abundances of Geometridae, Lasiocampidae, Lymantriidae, Notodontidae, Saturniidae, Sphingidae and Thyatiridae were not significantly associated with any independent variables. The diversity patterns of larger moths along environmental gradients and the relationship between moths and forest types were discussed.
Micellar Behavior of Anionic Surfactants with Sulfonate Function in Aqueous Solutions
Authors: Azira Hakima , Tazerouti Ammal 
Published: July 2007

AbstractUsing different reaction conditions of photosulfochlorination of n‐alkanes, various samples of anionic surfactants of sulfonates type have been obtained. Their micellar behavior was researched and the relationship between their isomeric distribution and so, their chemical structures and micellar behaviors were more thoroughly explored. Their critical micelle concentrations (CMC) were determined with surface tension measurements, the surface activities (γCMC) were obtained, the surface absorption amounts (Γm) and the molecular areas (Am) at the interface of air‐water gained by using Gibbs' equation. In addition, under the conditions of adding electrolyte NaCl, the critical micellar concentrations (CMCs) of two samples were also examined, and the effects of the addition of electrolyte on their micellar behaviors were studied. The experiment results show that the samples rich in secondary isomers have characteristic micellar behavior: CMC are higher, and the abilities to decrease surface tension are better, which well compared to common anionic surfactants, especially Hostapur 60, commercially available. Besides, the effects of addition of electrolyte on the micellar behaviors of the anionic surface‐active agents are similar to common anionic surfactants.
Effect of peripheral endothelin‐1 concentration on carcinoma‐induced pain in mice
Authors: Pickering Victoria , Gupta R. Jay , Quang Phuong , Jordan Richard C. , Schmidt Brian L. 
Published: August 2007

AbstractIn this study, we investigated the role of the peripheral endothelin‐1 (ET‐1) concentration in a cancer pain model. To test the hypothesis that the concentration of ET‐1 in the tumor microenvironment is important in determining the level of cancer pain we used two cancer pain mouse models that differed significantly in production of ET‐1. The two mouse cancer models were produced by injection of cells derived from a human oral squamous cell carcinoma (SCC) and melanoma into the hind paw of female mice. Pain, as indicated by reduction in withdrawal thresholds in response to mechanical stimulation, was significantly greater in the SCC group than the melanoma group. The peripheral concentration of ET‐1 within the cancer microenvironment was significantly greater in the SCC group. Intra‐tumor expression of both ET‐1 mRNA and ET‐1 protein were significantly higher in the SCC model compared to the melanoma model. ET receptor antagonism was effective as an analgesic for cancer pain in the SCC model only. To address the potential confounding factor of tumor volume we evaluated the contribution of tumor volume to cancer pain in the two models. The mean volumes of the tumors in the melanoma group were significantly greater than the tumors in the SCC group. In both groups, the pain level correlated with tumor volume, but the correlation was stronger in the melanoma group. We conclude that ET‐1 concentration is a determinant of the level of pain in a cancer pain mouse model and it is a more important factor than tumor volume in producing cancer pain. These results suggest that future treatment regimens for cancer pain directed at ET‐1 receptor antagonism show promise and may be tumor type specific.
Butterbur root extract and music therapy in the prevention of childhood migraine: An explorative study
Authors: Oelkers‐Ax Rieke , Leins Anne , Parzer Peter , Hillecke Thomas , Bolay Hans V. , Fischer Jochen , Bender Stephan , Hermanns Uta , Resch Franz 
Published: August 2007

AbstractBackground: Migraine is very common in school‐aged children, but despite a number of pharmacological and non‐pharmacological options for prophylaxis, randomized controlled evidence in children is small. Evidence‐based prophylactic drugs may have considerable side effects.Objective: This study was to assess efficacy of a butterbur root extract (Petadolex®) and music therapy in primary school children with migraine.Design: Prospective, randomized, partly double‐blind, placebo‐controlled, parallel‐group trial.Methods: Following a 8‐week baseline patients were randomized and received either butterbur root extract (n=19), music therapy (n=20) or placebo (n=19) over 12 weeks. All participants received additionally headache education (“treatment as usual”) from the baseline onwards. Reduction of headache frequency after treatment (8‐week post‐treatment) as well as 6 months later (8‐week follow‐up) was the efficacy variable.Results: Data analysis of subjects completing the respective study phase showed that during post‐treatment, only music therapy was superior to placebo (p=0.005), whereas in the follow‐up period both music therapy and butterbur root extract were superior to placebo (p=0.018 and p=0.044, respectively). All groups showed a substantial reduction of attack frequency already during baseline.Conclusion: Butterbur root extract and music therapy might be superior to placebo and may represent promising treatment approaches in the prophylaxis of paediatric migraine.
Postprandial plasma adiponectin decreases after glucose and high fat meal and is independently associated with postprandial triacylglycerols but not with − 11388 promoter polymorphism
Authors: Rubin Diana , Helwig Ulf , Nothnagel Michael , Lemke Nina , Schreiber Stefan , Fölsch Ulrich R , Döring Frank , Schrezenmeir Jürgen 
Published: July 2007

Adiponectin is discussed to regulate energy balance and insulin sensitivity. Several studies indicated an association of fasting adiponectin with parameters of the metabolic syndrome. We investigated postprandial adiponectin release and its relation to traits of the metabolic syndrome. Serum adiponectin concentration after an oral glucose tolerance test and after ingestion of a standardised mixed, fat-containing meal in 110 male non-diabetic subjects was assessed. Fasting and postprandial adiponectin and the decrease of adiponectin were correlated with anthropometric and metabolic parameters. Subjects were genotyped for adiponectin − 11 388 G/A promoter single nucleotide polymorphism. Adiponectin slightly decreased after both test meals. A significant decrease was attained 5 and 6 h after the lipid load and 2 h after the glucose load. Particularly, the mixed meal postprandial adiponectin showed stronger correlations with most traits of the metabolic syndrome than fasting adiponectin: postprandial adiponectin with HDL (r 0·30) v. fasting adiponectin with HDL (r 0·23); with postprandial insulin (area under the curve): r − 0·20 v. r − 0·16; with fasting insulin: r 0·10 v. r 0·14; with BMI: r − 0·23 v. r − 0·20; with waist: r − 0·18 v. − 0·16; with systolic blood pressure: r − 0·14 v. r − 0·12; with diastolic blood pressure: r − 0·18 v. r − 0·15. In multivariate analysis, postprandial TAG were the only independent predictor of adiponectin. There was no significant association of adiponectin, NEFA and TAG with − 11 388 G/A adiponectin promoter polymorphism. Our findings favour the interpretation that postprandial adiponectin has the strongest and independent associations to postprandial TAG metabolism.
Primary respiratory support in preterm infants with cleft lip and palate
Authors: Eifinger F , Lang-Roth R , Braumann B , Saffar M , Huenseler C , Kribs A 
Published: August 2007

AbstractObjective:Preterm infants with respiratory distress are routinely treated by application of nasal mask continuous positive airway pressure. In preterm infants with cleft lip and palate, nasal mask attachment is not feasible due to air leakage through the cleft defect. Here, we describe a modified continuous positive airway pressure application method that overcomes this problem.Design and subjects:Observation study, university neonatal intensive care unit. The neonates (n = 4) were between 28 and 33 weeks' gestation and weighed 1160 to 1680 g at birth. Immediately after birth, infants with unilateral cleft lip and palate (n = 3) were respiratory stabilised by a Medijet™ generator using a nasal tube. To minimise the pressure cap, hydrocolloid bandages were adhered over the total cleft defect. Immediately after orthodontic passive palatal plates insertion (within 27 hours of life), the nasal tube was removed and continuous positive airway pressure was applied through a nasal mask covering the complete nose of the infant.Results:The system proved suitable for patients with unilateral cleft lip and palate for whom the generated nasal mask continuous positive airway pressure remained constant between 5 to 7 cm of water but failed in the patient with bilateral cleft lip and palate. None of the patients had to be ventilated due to respiratory failure, and all survived to discharge.Conclusion:Preterm infants with unilateral, but not bilateral cleft lip and palate, can be successfully stabilised using the described nasal mask continuous positive airway pressure system, thereby avoiding primary intubation and its associated risk of complications.
Masson's pseudotumour of the ethmoid sinus – a case report
Authors: Hooda S , Humphreys M R , Wong S W , Evans A S 
Published: August 2007

AbstractObjective:We report a case of Masson's pseudotumour or intravascular papillary endothelial hyperplasia presenting in the ethmoid sinus.Case report:We present a diagnostically challenging case of Masson's pseudotumour of the ethmoid sinus presenting with persistent epistaxis and a review of the available literature.Conclusion:Intravascular papillary endothelial hyperplasia is a benign, reactive lesion first described by the French pathologist Pierre Masson in 1923. It can lead to diagnostic uncertainty due to its close resemblance clinically, radiologically and histopathologically to angiosarcoma.