bluuebunny/crossref_metadata_2025_split huggingface dataset:
Experimental Study of Smectite Interaction with Metal Fe at Low Temperature: 1. Smectite Destabilization
Authors: Lantenois Sébastien , Lanson Bruno , Muller Fabrice , Bauer Andreas , Jullien Michel , Plançon Alain 
Published: November 2005

AbstractInteraction between metal Fe and a variety of natural and synthetic smectite samples with contrasting crystal chemistry was studied by scanning electron microscopy and X-ray diffraction from experiments conducted at 80°C. These experiments demonstrate an important reactivity contrast as a function of smectite crystal chemistry. An XRD method involving the use of an internal standard allowed quantification of the relative proportion of smectite destabilized as a function of initial pH conditions as well as of smectite structural parameters. In mildly acidic to neutral pH conditions, a significant proportion of metal Fe is corroded to form magnetite without smectite destabilization. Under basic pH conditions, smectite and metal Fe are partly destabilized to form magnetite and newly-formed 1:1 phyllosilicate phases (odinite and crondstedtite). More specifically, systematic destabilization of both metal Fe and smectite is observed for dioctahedral smectites while trioctahedral smectites are essentially unaffected under similar experimental conditions. In addition, smectite reactivity is enhanced with increasing Fe3+ content and with the presence of Na+ cations in smectite interlayers. A conceptual model for smectite destabilization is proposed. This model involves first the release of protons from smectite structure, MeFe3+OH groups being deprotonated preferentially and metal Fe acting as proton acceptor. Corrosion of metal Fe results from its interaction with these protons. The Fe2+ cations resulting from this corrosion process sorb on the edges of smectite particles to induce the reduction of structural Fe3+ and migrate into smectite interlayers to compensate for the increased layer-charge deficit. Interlayer Fe2+ cations subsequently migrate to the octahedral sheet of smectite because of the extremely large layer-charge deficit. At low temperature, this migration is favored by the reaction time and by the absence of protons within the di-trigonal cavity. Smectite destabilization results from the inability of the tetrahedral sheets to accommodate the larger dimensions of the newly formed trioctahedral domains resulting from the migration of Fe2+ cations.
Nickel Catalysts Supported on MgO/Smectite-Type Nanocomposites for Methane Reforming
Authors: Moronta Alexander , Iwasa Nobuhiro , Fujita Shin-Ichiro , Shimokawabe Masahide , Arai Masahiko 
Published: November 2005

AbstractMgO-clay nanocomposites were prepared from a synthetic smectite-type clay, TS, using three different non-ionic surfactants (Igepal CA-720, Brij 30 and Brij 56) and the resulting clay nanocomposites were impregnated with Ni for the methane reforming reaction with carbon dioxide to synthesis gas. A Ni/TS catalyst was also prepared for comparison. The prepared supports and catalysts were characterized by X-ray diffraction, X-ray fluorescence, thermogravimetric analysis and N2 adsorption/desorption isotherms. The thermal stability, pore structure and the surface area strongly influence the catalytic behavior of the catalysts. The methane conversions (at 700°C for 4 h) were 91, 95 and 97% for Ni/TSIGE, Ni/TSBR30 and Ni/TSBR56, respectively, indicating that the surface properties and the catalytic performance of the resulting solids slightly improved as the polyethylene oxide number of the surfactant increased. A reduced conversion (10%) and a rapid deactivation was observed in the Ni/TS catalyst, attributed to its Na content and low thermal stability, which led to sintering and coke deposition.
Compositional and Structural Variation of Sudoite from the Betic Cordillera (Spain): A TEM/AEM Study
Authors: Ruiz Cruz María Dolores , de Galdeano Carlos Sanz 
Published: November 2005

AbstractSudoite from diagenetic to very low-grade metaclastites of the Betic Cordillera was studied by X-ray diffraction and transmission/analytical electron microscopy. Sudoite formed directly from dickite, the assemblage dickite + sudoite + illite being replaced at increasing metamorphic grade by the assemblage pyrophyllite + sudoite + illite. Sudoite ranges in composition from Mg-rich to Fe-rich chemistries. In addition, a wide variety of mixed-layered structures (illite-sudoite, pyrophyllite-sudoite, and dickite-sudoite) was also identified. Mg-rich sudoite shows a mean chemical composition of (Al2.91Fe0.252+Mg1.80)(Si3.10Al0.90)O10(OH)8, and a IIb ordered structure with b = 9.055 Å. Intermediate Fe-Mg sudoite exhibits a very variable composition, the Fe-rich phases having a mean composition of (Al2.09Fe0.613+Fe0.872+Mg1.44)(Si3.31Al0.69O10(OH)8. These are disordered polytypes with b values ranging from 9.070 to 9.101 Å. Fe occurs in both octahedral sheets, according to two types of substitutions: Fe3+ for Al in the dioctahedral sheet and Fe2+ for Mg in the trioctahedral sheet. Sudoite with such a composition has not been described previously.
The Nature of Zeolite Occurrences in Deposits of the Olduvai Basin, Northern Tanzania
Authors: Mees Florias , Stoops Georges , Van Ranst Eric , Paepe Roland , Van Overloop Elfi 
Published: November 2005

AbstractThe Plio-Pleistocene deposits of the Olduvai Basin in northern Tanzania consist of a sequence of lacustrine and fluvial sediments. They contain various amounts of zeolite minerals, the formation of which is related to an interaction of volcanic material or detrital clays with saline alkaline lake water and groundwater. Petrographic characteristics of zeolite occurrences provide information about their conditions of formation. They were studied for all four main stratigraphical units that are recognized at Olduvai (Beds I to IV), sampled in the southeastern part of the basin. In the lake-margin deposits of Bed I and the lower part of Bed II, chabazite is the dominant zeolite mineral accompanied by phillipsite and minor amounts of erionite and clinoptilolite. Chabazite commonly occurs as part of altered volcanic rock fragments, characterized by partial or complete dissolution of volcanic glass and the formation of chabazite inside vesicles, following the development of thin smectite coatings. It also formed within the sediment matrix, requiring extended periods of impregnation of the deposits by saline alkaline solutions. Chabazite also occurs extensively as coatings and infillings of pores, developed during periods of subaerial exposure which were characterized by high groundwater levels. Phillipsite formed at a later stage, from more evolved solutions, with higher K/Na ratios than during chabazite formation. The fluvial deposits of Bed IV, Bed III and the upper part of Bed II have a high analcime content. They also contain various amounts of chabazite, phillipsite and natrolite. All zeolite minerals mainly occur in pores. The predominance of analcime indicates a higher salinity and alkalinity than during the preceding period with sedimentation and diagenesis in a lake margin environment. Early development of zeolite occurrences, shortly after the deposits became exposed during breaks in sedimentation, is recorded for some intervals, where zeolites are covered by illuvial clay coatings or by sparitic carbonate cement. In most intervals, however, zeolites mainly formed at a later stage.
Involvement of 5-HT1AReceptors in Prefrontal Cortex in the Modulation of Dopaminergic Activity: Role in Atypical Antipsychotic Action
Authors: Díaz-Mataix Llorenç , Scorza M. Cecilia , Bortolozzi Analía , Toth Miklos , Celada Pau , Artigas Francesc 
Published: November 2005

Atypical antipsychotics increase dopamine (DA) release in the medial prefrontal cortex (mPFC), an effect possibly involved in the superior effects of atypical versus classical antipsychotics on cognitive/negative symptoms. We examined the role of 5-HT1Areceptors in the mPFC on the modulation of dopaminergic activity and the mesocortical DA releasein vivo. The highly selective 5-HT1Aagonist BAY x 3702 (BAY; 10-40 μg/kg, i.v.) increased the firing rate and burst firing of DA neurons in the ventral tegmental area (VTA) and DA release in the VTA and mPFC. The increase in DA release in both areas was potentiated by nomifensine coperfusion. The selective 5-HT1Aantagonist WAY-100635 reversed the effects of BAY in both areas, and the changes in the VTA were prevented by frontocortical transection.The application of BAY in rat and mouse mPFC by reverse dialysis increased local extracellular DA at a low concentration (3 μm) and reduced it at a higher concentration (30 μm). Both effects disappeared in 5-HT1Aknock-out mice. In the presence of bicuculline, BAY reduced DA release at all concentrations. The atypical antipsychotics clozapine, olanzapine, and ziprasidone (but not haloperidol) enhanced DA release in the mPFC of wild-type but not 5-HT1Aknock-out mice after systemic and local (clozapine and olanzapine) administration in the mPFC. Likewise, bicuculline coperfusion prevented the elevation of DA release produced by local clozapine or olanzapine application. These results suggest that the activation of mPFC 5-HT1Areceptors enhances the activity of VTA DA neurons and mesocortical DA release. This mechanism may be involved in the elevation of extracellular DA produced by atypical antipsychotics.
Digital Networks and Citizenship
Authors: Poster Mark 
Published: November 2005

Paradoxical as it may appear, isn't it through the rights of man that transpires today—at a planetary level—the worst discriminations?—Jean Baudrillard, Les mots de passeCritical discourse today locates an antagonism between globalization and citizenship. The deepening of globalizing processes strips citizens of power, this position maintains. As economic processes become globalized, the nation-state loses its ability to protect its population. Citizens lose their ability to elect a leadership that effectively pursues their interests. When production facilities are dispersed beyond the nation, jobs are lost to foreigners, labor markets are affected by conditions in countries with diverse living standards, and capital flows, at the speed of light, to places of optimum returns. Consumption is also planetary in scope, bringing across borders alien cultural assumptions as embodied in commodities. The popular need no longer be the local. Although foreign goods are inflected with community values and easily adapted to local conditions, they remain indexes of otherness. What is more dramatic still than the changes in production and consumption, nation-states are losing their cultural coherence by dint of planetary communications systems. Much of contemporary music is global music or at least a fusion of diverse musical cultures. Satellite technology and the Internet bring all media across national boundaries as if those borders did not exist. Global processes run deep and wide, rendering problematic the figure of the citizen as a member of a national community.
Publicity and Indifference (Sarajevo on Television)
Authors: Keenan Thomas 
Published: November 2005

The price of eternal vigilance is indifference.—Marshall McLuhan,Understanding Media(30)Here in Sarajevo, hundreds of TV crews parade before our very eyes; dozens of foreign journalists, reporters, and writers. Everything is known here, right down to minutest details, and yet, nothing …—Jean Marie Cardinal Lustiger (qtd. in Dizdarevic 39)With these epigraphs I aim to abbreviate a frequently cited “lesson of bosnia”——That a country was destroyed and a genocide happened, in the heart of Europe, on television, and what is known as the world or the West simply looked on and did nothing. Bosnians, said one to the American journalist David Rieff, “felt as you would feel if you were mugged in full view of a policeman and he did nothing to rescue you” (140). Or, as Rieff says with slightly more precision,200,000 Bosnian Muslims died, in full view of the world's television cameras, and more than two million other people were forcibly displaced. A state formally recognized by the European Community and the United States […] and the United Nations […] was allowed to be destroyed. While it was being destroyed, UN military forces and officials looked on, offering “humanitarian” assistance and protesting […] that there was no will in the international community to do anything more. (23)
Figuration
Authors: Bal Mieke 
Published: November 2005

Trained and working in literary studies, i began to analyze visual artifacts such as paintings sometime in the late 1980s. My interest in visual aspects has grown out of the realization that subjectivity is formed by a perpetual adjustment of images passing before the subject, who, as focalizer, makes them into a whole that is comprehensible because it is continuous. Having a certain continuity in one's thought depends, at a level more subliminal than conscious, on having a certain continuity in one's images.But continuity is not the same thing as coherence. This distinction is another source of interest that informs work on visual narrativity. In such historically and sociologically varied texts and images as modern novels, the ancient and incomplete fragments that make up the Hebrew bible, and Rembrandt's paintings, I constantly came up against that which eludes the coherence of these artifacts. My attention was systematically arrested by the detail that seems out of place, the contradiction that tears open the work, the monstrous element that reveals flaws and disparities and, because it provokes astonishment, offers never-ending possibilities for the understanding of these works. Such experiences led me to consider those dimensions of literature that classical narratology has tended to think marginal and that pictorial narratology, unbounded by the presumption of linearity, would promote to the forefront or, at least, deploy as heuristic instruments with which to grasp structure outside linear plots.
ET-743: A Novel Agent with Activity in Soft Tissue Sarcomas
Authors: Fayette Jérôme , Coquard Isabelle Ray , Alberti Laurent , Ranchère Dominique , Boyle Helen , Blay Jean-Yves 
Published: November 2005

Abstract

Learning Objectives
After completing this course, the reader will be able to: Describe the original mechanism of action of ET-743.Explain the management of patients treated with ET-743, including what biological exams are needed because of toxicity and what is the optimal schedule of administration.Choose the best histological subtype of sarcoma for treatment with ET-743 and describe the clinical aim of treatment.Discuss putative combinations of ET-743 with other therapies.
Access and take the CME test online and receive 1 AMA PRA category 1 credit at CME.TheOncologist.com
Ecteinascidin-743 (ET-743) is a natural product derived from the marine tunicate Ectenascidia turbinate. ET-743 binds in the minor groove of DNA, blocks transcription factors activity, and traps protein from the nucleotide excision repair system, thus blocking cells in G2-M phase. ET-743 demonstrated cytotoxic activity at very low concentrations against sarcoma cell lines in pre-clinical studies. In several phase II clinical studies in patients with advanced sarcoma failing conventional doxorubicin- and ifosfamide-based chemotherapy, ET-743 delivered by continuous intravenous 24-hour infusion at a dose of 1,500 μg/m2 every 21 days yielded 8% overall response and 30%–40% stabilization rates for a clinical benefit rate close to 40%. Interestingly, long-term stabilizations over more than 3 years have been described. In vivo, ET-743 has a specific toxicity profile, the major toxicity of this product being hepatic, through biliary duct destruction, and hematologic. ET-743 has also been evaluated in first-line treatment for these patients. Finally, due to its original mode of action and the lack of cross-resistance with other chemotherapy agents, ET-743 was tested in a preclinical model in combination with other drugs. Synergy was reported in vitro with doxorubicin and cisplatin; phase I combination studies are in progress.
Spatial, temporal, and dietary determinants of organic contaminants in nestling tree swallows in Point Pelee National Park, Ontario, Canada
Authors: Smits Judit E. G. , Bortolotti Gary R. , Sebastian Mary , Ciborowski Jan J. H. 
Published: November 2005

Abstract
Point Pelee National Park of Canada in southwestern Ontario, an important migratory route andvital breeding area for many birds, has localized areas of organochlorine (OC) pesticide contamination from agricultural production during the 1950s and 1960s. During 2001 and 2002, we investigated movement of persistent contaminants through the food web with the insectivorous tree swallow (Tachycineta bicolor) as a sentinel. The a priori site classifications, contaminated or reference, were based on soil residues of dichlorodiphenyltrichloroethane (DDT) and its breakdown products (∑DDT), dieldrin, and other OC pesticides. In 2001, all nestling tissue samples were pooled by site, and residue levels did not reflect the soil contaminant status. To improve sampling accuracy in 2002, tissue residues were determined from birds in individual nests. This showed OC pesticides to be higher in samples from contaminated sites compared with reference sites (p = 0.031). Polychlorinated biphenyls (PCBs), which were not detected in soil samples, were present in the nestlings and were not related to site of origin (p = 0.422). In 2002, dietary samples were collected from nestlings and identified to taxon, and representative insects collected from nesting sites were analyzed for PCBs and other OCs. Consumption of terrestrial prey was positively correlated with tissue residues of ∑DDT (p = 0.006), whereas PCBs came from aquatic prey, Hexagenia mayflies (p = 0.003). Dietary details proved valuable in this study of contaminant transfer in insectivorous vertebrates.
Extracellular signal-regulated kinase-signaling-dependent G2/M arrest and cell death in murine macrophages by cadmium
Authors: Kim Jiyoung , Kim Sang Hyun , Johnson Victor J. , Sharma Raghubir P. 
Published: November 2005

Abstract
Cadmium is a nonessential heavy metal and a well-known persistent environmental pollutant. I causes a variety of toxic effects, including immunotoxicity. The exact mechanism of its cellular effects still is unclear. Cell-cycle regulation is an important factor that modulates cell death; however, cadmium-mediated cell-cycle arrest leading to cell death in murine macrophages has not been investigated. Cadmium at 20 μM induced both apoptotic and necrotic death in murine macrophage (J774A.1) cultures at 24 h. Cadmium at 20 μM triggered re-entry of G0/G1 to the next phase and increased the number of cells in the G2/M phase at 24 h. Phosphorylation of extracellular signal-regulated kinase (ERK) correlated with the cyclin-dependent kinase inhibitor p21WAF1/CIP1 induction. Inhibition of ERK activation by PD98059 resulted in G0/G1 arrest and partially released the cadmium-mediated G2/M arrest. Inhibition of ERK phosphorylation by PD98059 strongly attenuated cadmium-induced necrotic cell death, but did not prevent caspase-3 activation and DNA fragmentation. Necrosis rather than apoptosis was caused by cadmium-induced ERK signaling in J774A.1 cells. A scavenger of reactive oxygen species (ROS), N-acetylcystein, decreased cadmium-induced ERK activation and necrotic cell death, suggesting that cadmium induces the ROS-ERK-p21WAF1/CIP1 signaling pathway, leading to G2/M arrest and cell death. These findings may be important in further understanding the cellular mechanisms of cadmium toxicity to provide information to assess objectively risk for this metal.
Reproductive success and contaminants in tree swallows (Tachycineta bicolor) breeding at a wastewater treatment plant
Authors: Dods Patti L. , Birmingham Erinn M. , Williams Tony D. , Ikonomou Michael G. , Bennie Donald T. , Elliott John E. 
Published: November 2005

Abstract
The uptake and effects of contaminants were measured in the insectivorous tree swallow (Tachycineta bicolor) at a wastewater treatment site. The study examined reproductive, immunological, and growth endpoints in tree swallows exposed to chlorinated hydrocarbon contaminants and to 4-nonylphenol in wastewater lagoons at the Iona Wastewater Treatment Plant, Vancouver (BC, Canada). Clutch size was significantly lower in tree swallows breeding at Iona Island in 2000 and 2001 compared to the reference site. In 2000, fledging success was significantly lower and mean mass of nestling livers was significantly higher in the tree swallows breeding at the Iona Island Wastewater Treatment Plant. Additional factors that may influence reproductive success, such as parental provisioning and diet composition, did not differ significantly between sites. Levels of 4-nonylphenol detected in sediment and insects were elevated at the Iona Island Wastewater Treatment Plant (2000: lagoon sediment 82,000 ng/g dry wt, insects 310 ng/g wet wt; 2001: lagoon sediment 383,900 ng/g dry wt, insects 156 ng/g wet wt) compared to the reference site (2000: pond sediment 1,100 ng/g dry wt, insects not sampled; 2001: pond sediment 642 ng/g dry wt, insects 98 ng/g wet wt). These results indicate that tree swallows might be a useful indicator species for exposure to 4-nonylphenol at wastewater treatment sites; however, further work is necessary to determine the extent of uptake and effects of 4-nonylphenol in riparian insectivorous birds.
Light as a confounding factor for toxicity assessment of complex contaminated sediments
Authors: Grote Matthias , Brack Werner , Walter Helge A. , Altenburger Rolf 
Published: November 2005

Abstract
Polycyclic aromatic hydrocarbons (PAHs) are contaminants often found in sediments. Their relevant contribution to toxic effects induced by environmental samples has been demonstrated using effect-directed analysis (EDA). Toxicity of PAHs previously has been reported to depend on light conditions. The aim of this study was to analyze the influence of simulated sunlight, in comparison to standard algal growth light, on the toxicity of samples, in which PAHs were identified as major toxicants using EDA. Additionally, toxicity of identified toxicants and mixtures of these compounds were assessed. It can be shown that the samples, the PAH compounds, and the created mixtures exhibit photoenhanced toxicity. The combined effects of the mixtures can be predicted using the model of concentration addition. This is surprising because different modes of action have been reported to contribute to phototoxicity of the identified toxicants. For the confirmation step in EDA, the toxicity assessment under simulated sunlight reveals that less of the samples' toxicity can be explained by the identified compounds, compared to the assessment conducted under standard growth light. Finally, the relevance of light conditions in the toxicity assessment is demonstrated for eight out of 13 transect samples of sediment extracts from river Elbe, Germany.