bluuebunny/crossref_metadata_2025_split huggingface dataset:
SEM and EDX analyses of the scales formed on Fe—24Cr—5V—Pd and Fe—24Cr—5Mo—Pd alloy systems
Authors: Tjong S. C. , Chung C. K. 
Published: May 2005

AbstractSEM and EDX analyses were used to characterize the morphologies of the scales formed on the Fe—24Cr—5V—Pd and Fe—24Cr—5Mo—Pd alloy systems in air at 900°C. SEM observations revealed that porous and non‐protective FeCr2O4 scales were formed on the Fe—24Cr—5V—Pd alloy system. Addition of Pd has no influence on the oxidation performance of the Fe—24Cr—5V alloy. However, thin and adherent Cr2O3 scales were formed on the Fe—24Cr—5Mo—Pd alloy system. The EDX analyses showed that Pd was enriched at the oxide—alloy interface of the Fe—24Cr—5Mo—3Pd alloy. This Pd‐enriched layer provided a fast diffusion path for Cr to form Cr2O3 oxide scales.
RPB7, one of two dissociable subunits of yeast RNA polymerase II, is essential for cell viability
Authors: McKune Keith , Richards Kristy L. , Edwards Aled M. , Young Richard A. , Woychik Nancy A. 
Published: May 2005

AbstractThe Saccharomyces cerevisiae RNA polymerase II subunit gene RPB7 was isolated and sequenced. RPB7 is a single copy gene whose sequence predicts a 19,000 Dalton protein of 171 amino acids. RPB7 is known to dissociate from RNA polymerase II as an RPB4/RPB7 subcomplex in vitro. RPB7 also appears to interact with RNA polymerase II in a manner dependent upon RPB4, since RNA polymerase II purified from cells lacking RPB4 also lacks RPB7. Previous results have demonstrated that deletion of the RPB4 results in slow growth and cold‐ and temperature‐sensitivity. In contrast, deletion of the RPB7 gene revealed that it is essential for cell growth and viability. Loss of both the RPB4 and the RPB7 genes causes lethality. These results suggest that RPB7 contributes to the function of RNA polymerase II in the absence of RPB4 either in a manner independent of its association with the enzyme or by directly binding to the enzyme in a manner independent of its association with RPB4.
XIV. Yeast sequencing reports. The sequence of a 44 420 bp fragment located on the left arm of chromosome XIV from Saccharomyces cerevisiae
Authors: Bergez Patricia , Doignon Francois , Crouzet Marc 
Published: May 2005

AbstractWe have determined the complete nucleotide sequence of a 44 420 bp DNA fragment from chromosome XIV of Saccharomyces cerevisiae. The sequence data revealed 23 open reading frames (ORFs) larger than 300 bp, covering 73·5% of the sequence. The ORFs N2418, N2441, N2474 and N2480 correspond to previously sequenced S. cerevisiae genes coding respectively for the mitochondrial import protein Mas5, the nucleolar protein Nop2, the outer mitochondrial membrane porin Por1, the cytochrome c oxidase polypeptide VA precursor CoxA and the yeast protein tyrosine phosphatase Msg5. Translation products of three other ORFs N2406, N2411 and N2430 exhibit similarity to previously known S. cerevisiae proteins: the ribosomal protein YL9A, the protein Nca3 involved in the mitochondrial expression of subunits 6 and 8 of the ATP synthase and actin; in addition N2505 presents strong similarity to an ORF of chromosome IX. The predicted protein products of ORFs N2417 and N2403 present similarities with domains from proteins of other organisms: the Candida maltosa cycloheximide‐resistance protein, the human interleukin enhancer‐binding factor (ILF‐2). The 12 remaining ORFs show no significant similarity to known proteins. In addition, we have detected a DNA region very similar to the yeast transposon Ty 1–15 of which insertion has disrupted a tRNAAsp gene. The sequence has been deposited in the GenBank database with the Accession Number U12141.
XIV. Yeast sequencing reports. An 8·2 kb DNA segment from chromosome XIV carries the RPD3 and PAS8 genes as well as the Saccharomyces cerevisiae homologue of the thiamine‐repressed nmt1 gene and a Chromosome III‐duplicated gene for a putative aryl‐alcohol dehydrogenase
Authors: van Dyck Luc , Pascual‐Ahuir Amparo , Purnelle Benedicte , Goffeau Andre 
Published: May 2005

AbstractAn 8·2 kb DNA segment from the left arm of Saccharomyces cerevisiae chromosome XIV (GenBank/EMBL accession number: X83226) encompasses four open reading frames (ORFs) longer than 100 residues. The ORF N0295 is highly similar to the Aspergillus parasiticus and Schizosaccharomyces pombe nmt1 gene products, which are involved in thiamine biosynthesis and are strongly repressed by thiamine. N0300 is 76% identical to YCR107w, a hypothetical protein of yeast chromosome III, and 55% identical to a ligninolytic aryl‐alcohol dehydrogenase from the white‐rot fungus Phanerochaete chrysosporium. In addition, this fragment encodes Rpd3, a pleiotropic transcription factor (Vidal and Gaber, 1991), and part of Pas8, a protein essential for the biogenesis of peroxisomes (Voorn‐Brouwer) et al., (1993). The sequence of the right flanking region has already been submitted to the EMBL data library under Accession Number Z46259 (Maftahi et al., 1995).
Chemischer Transport fester Lösungen. 20 [1] Der Chemische Transport von Mischphasen in den Systemen CdS/CdTe und CdSe/CdTe
Authors: Hotje U. , Binnewies M. 
Published: May 2005

Chemical Vapor Transport of Solid Solutions. 20, Chemical Vapor Transport of Mixed Phases in the Systems CdS/CdTe and CdSe/CdTeBy means of CVT methods using iodine as transport agent (900 → 800 °C) in the systems CdS/CdTe and CdSe/CdTe mixed crystals could be prepared. The system CdS/CdTe shows a broad miscibility gap. Sulfur rich mixed crystals as well as tellurium rich ones could be prepared. The system CdSe/CdTe shows complete miscibility for all Se/Te ratios. In both systems congruent transport has been observed.
[C10N2H10][ZnCl(HPO4)]2: A New Templated Zincophosphate Containing Tetrahedral Nets with 63 Topology
Authors: Natarajan Srinivasan , Ewald Bastian , Prots Yurii , Kniep Rüdiger 
Published: May 2005

AbstractThe crystal structure of [C10N2H10][ZnCl(HPO4)]2 contains corrugated tetrahedral layers $^{2}_{\infty}\rm [ZnCl(HPO_{4})^{-}]$ with 63 topology. Charge balance is achieved by insertion of diprotonated 4,4′‐bipyridine between the layers. Crystal data: monoclinic, P21/n (no. 14), a = 4.8832(2) Å, b = 22.673(2) Å, c = 8.1643(4) Å, β = 104.02(1)°; V = 877.0(1) Å3; Z = 4; R1 = 0.041 and wR2 = 0.088 for 1836 reflections [I > 2σ(I)]. Tetrahedral layers $^{2}_{\infty}\rm [ZnCl(HPO_{4})^{-}]$ are also observed in other organo‐ammonium templated compounds. However, their topologies are characterized by 4.82 nets. With the title compound a layered tetrahedral net $^{2}_{\infty}\rm [ZnCl(HPO_{4})^{-}]$ with 63‐topology is reported for the first time.
Some New Molecular Hydrides Stabilized and Characterized with the Aid of the Matrix‐Isolation Technique
Authors: Himmel Hans‐Jörg 
Published: May 2005

AbstractNew molecular hydrides have been prepared and characterized with the aid of the matrix isolation technique. These hydrides are products of spontaneous or photoactivated reactions taking place in the matrix. They show a remarkable structural variety reflecting the ability of H atoms to be positively or negatively polarized and to be engaged in terminal as well as bridging bonds. In addition to the academic interest in these molecules, the findings are of interest for applications. Thus the results will be discussed especially in the light of the increasing effort to fabricate new molecular hydrogen storage materials.
Synthese und Kristallstruktur von Cadmium‐Dodekahydro‐closo‐Dodekaborat‐Hexahydrat, Cd(H2O)6[B12H12]
Authors: Tiritiris Ioannis , Schleid Thomas 
Published: May 2005

Synthesis and Crystal Structure of Cadmium Dodecahydro closo‐Dodecaborate Hexahydrate, Cd(H2O)6[B12H12]Through neutralization of the aqueous free acid (H3O)2[B12H12] with cadmium carbonate (CdCO3) and after isothermic evaporation of the resulting solution, colourless lath‐shaped single crystals of Cd(H2O)6[B12H12] are obtained. Cadmium dodecahydro closo‐dodecaborate hexahydrate crystallizes at room temperature in the monoclinic system (space group: C2/m) with the lattice constants a = 1413.42(9), b = 1439.57(9), c = 749.21(5) pm and β = 97.232(4)° (Z = 4). The crystal structure of Cd(H2O)6[B12H12] can be regarded as a monoclinic distortion variant of the CsCl‐type structure. Two crystallographically different [Cd(H2O)6]2+ octahedra (d(Cd–O) = 227–230 pm) are present which only differ in their relative orientation. The intramolecular bond lengths for the quasi‐icosahedral [B12H12]2− cluster anions range in the intervals usually found for dodecahydro closo‐dodecaborates (d(B–B) = 177–179 pm, d(B–H) = 103–116 pm). The hydrogen atoms of the [B12H12]2− clusters have no direct coordinative influence on the Cd2+ cations. Due to the fact that no “zeolitic” crystal water molecules are present, a stabilization of the lattice takes place mainly via the B–Hδ−···+δH–O hydrogen bonds.
Synthesis and Crystal Structure of the Nitridosilicates Ca5[Si2N6] and Ca7[NbSi2N9]
Authors: Ottinger Frank , Nesper Reinhard 
Published: May 2005

AbstractCa5[Si2N6] and Ca7[NbSi2N9] were obtained by reaction of Ca3N2, Ca2N and Si3N4 (with addition of niobium powder in case of Ca7[NbSi2N9]) in closed tantalum ampoules at temperatures at 1060 °C and 1000 °C, respectively. Ca5[Si2N6] is monoclinic C2/c with a = 983.6(2) pm, b = 605.2(1) pm, c = 1275.7(3), β = 100.20(3)° and Z = 4 crystallising homotypically to Ba5[Si2N6]. The crystal structure contains pairs of edgesharing SiN4 tetrahedra forming isolated nitridosilicate anions of [Si2N6]10−. Ca7[NbSi2N9] is monoclinic P21/m with a = 605.1(1), b = 994.6(2), c = 899.7(2), β = 92.10(1)°, Z = 2 and crystallises in an hitherto unknown structure type. Ca7[NbSi2N9] contains isolated anions [NbSi2N9]14− which are composed of two edgesharing SiN4 tetrahedra and an edge‐sharing NbN5 pyramid. So far, such a pseudotrisilicate unit has not been observed in the family of silicates.
One‐dimensional Diamagnetic‐metal Nitronyl Nitroxide Radical Complexes with Dicyanoargentate(I) Bridges: M(NIT4Py)2[Ag(CN)2]2 (M= Zn, Cd)
Authors: Wang Shu‐Ping , Li Dong‐Jiao , Song You , Gao Dong‐Zhao , Chen Jing , Liu Zhan‐Quan , Liao Dai‐Zheng , Jiang Zong‐Hui , Yan Shi‐Ping 
Published: May 2005

AbstractTwo diamagnetic‐metal nitronyl nitroxide radical complexes with dicyanoargentate(I) bridges M(NIT4Py)2[Ag(CN)2]2 (M= Zn, Cd) were synthesized. X‐ray crystallography reveals that the two compounds are isomorphous, which crystallize in the triclinic ${\rm P}{\bar 3}$ space group. Their structures consist of infinite chains of M(NIT4Py)2 units linked by [Ag(CN)2]− μ2‐bridging ligands. The magnetic measurements showed that the χMT values are nearly constants at higher temperature for both complexes. The sharp decreasing of χMT values at lower temperature are related to intermolecular antiferromagnetic interactions, which result from the shortest interchain contacts of nitroxide groups in the crystals.
Crystal Structure and Ionic Conductivity of Cesium Trifluoromethyl Sulfonate, CsSO3CF3
Authors: Hildebrandt Lars , Dinnebier Robert , Jansen Martin 
Published: May 2005

AbstractThe crystal structures of the room and the high temperature modifications of cesium trifluoromethyl sulfonate were solved from high resolution X‐ray powder diffraction data. At room temperature, α‐CsSO3CF3 crystallizes in the monoclinic space group P21 with lattice parameters a = 9.7406(2) Å, b = 6.1640(1) Å, c = 5.4798(1) Å, and β = 104.998(1)°; Z = 2. At temperatures above T = 380 K, a second order phase transformation towards a disordered C‐centered orthorhombic phase in space group Cmcm occurs with lattice parameters at T = 492 K of a = 5.5074(3) Å, b = 19.4346(14) Å, and c = 6.2978(4) Å; Z = 4. Within the crystal structures, the triflate anions are arranged in double layers with the apolar CF3‐groups pointing towards each other. The cesium ions are located between the SO3‐groups. CsSO3CF3 shows a specific ion conductivity ranging from σ = 1.06·10−8 Scm−1 at T = 393 K to σ = 5.18·10−4 Scm−1 at T = 519 K.
Studies with bombesin in man
Authors: Basso Nicola , Lezoche Emanuele , Speranza Vincenzo 
Published: May 2005

AbstractThe bombesin (BBS) infusion test was performed in 232 subjects with a variety of conditions, including 35 normal individuals, 41 duodenal ulcer patients, 13 gastric ulcer patients, and 14 patients with Zollinger‐Ellison syndrome. Side effects occurred in 80% of patients, but in only 6% was the test discontinued due to discomfort. All side effects promptly subsided when BBS infusion was interrupted. The dose of BBS eliciting the maximal gastrin response was 15 ng/kg per minute. In man, BBS showed a powerful stimulatory action on antral and gastrinoma G cells. No effect on duodenal G cells was apparent. Plasma levels of the different molecular forms of gastrin were all augmented by BBS infusion. BBS potentiated the gastrin response to a meal and elicited a prolonged and sustained gastrin response in patients with Menetrier's disease. Cells with BBS‐like immunoreactivity were demonstrated in the gastrointestinal tract of man. These data suggest that BBS may play a physiologic role in man.The clinical value of the BBS test was mainly assessed in the study of patients with postgastrectomy recurrent ulcer. In these patients, the BBS test clearly segregated patients with hypersecretion of gastrin from patients without such hypersecretion, and helped to elucidate the pathophysiologic features causing hypergastrinemia.In perspective, BBS should be viewed as an endocrine polyreleaser (gastrin, CCK, PP, glucagon) and as a member of the family of immunoreactive brain‐gut peptides. The role of BBS in the “brain‐gut axis” remains to be determined.
Endocrinology of duodenal ulcer
Authors: Creutzfeldt W. , Arnold R. 
Published: May 2005

AbstractSeveral gastrointestinal peptides with proven or suggested endocrine or paracrine functions influence gastric acid secretion, gastrointestinal motility, and mucosal blood flow. Increased or decreased release of such factors could participate in the pathogenesis of duodenal ulcer disease by inducing increased gastric acid concentration in the duodenal bulb. To date, increased stimulation of parietal cells by gastrin has been demonstrated only in patients with gastrinoma, G‐cell hyperplasia, gastric outlet obstruction, hyperparathyroidism, excluded antrum, and short bowel syndrome, but not in the usual duodenal ulcer disease. Also, a defective inhibition of parietal cell function by endocrine or paracrine factors, such as gastric inhibitory polypeptide, secretin, somatostatin and vasoactive intestinal polypeptide, seems not to exist in patients with duodenal ulcer disease. However, as long as the physiology of gastrointestinal peptides in gastric secretion and motility is not understood, a possible role of these factors in the pathogenesis of simple duodenal ulcer disease cannot be excluded.
Effect of duodenal osmolality on gastrin and secretin release and on gastric and pancreatic secretion
Authors: Teichmann Reinhard K. , Swierczek Janusz S. , Rayford Phillip L. , Thompson James C. 
Published: May 2005

AbstractWe have measured the osmolality of duodenal contents in 9 dogs after a hypertonic meal, given either by mouth or directly into the stomach or perfused into the duodenum. A test meal of 2,475 mosm/kg, given by mouth, raised the intraduodenal osmolality to 700–1,500 mosm/kg over a 1‐hour period. Hypertonic glucose solutions (2,000 and 3,400 mosm/kg), given into the stomach, were found to be diluted to about 700 and 1,100 mosm/kg, respectively, at the level of the mid‐duodenum 30 minutes later. Hypertonic saline solutions (1,800 and 2,700 mosm/kg), perfused into the duodenum, created a stable intraluminal osmolality of 800 and 1,200 mosm/kg, respectively, (about 45% that of the perfusate) after 30 minutes.In 6 Heidenhain pouch dogs, gastric secretion and gastrin release stimulated by food were significantly diminished by administration of hypertonic sodium chloride solution (1,800 mosm/kg) into the duodenum. This hyperosmolality caused greater suppression of acid secretion (52%) than of gastrin release (28%). Stimulation of pancreatic water and bicarbonate secretion and of release of radioimmunoassayable secretin by intraduodenal HCl (pH 1.3) were significantly suppressed when the osmolality of the HCl solution was raised to 2,700 mosm/kg. Pancreatic protein secretion remained unchanged with hypertonic solutions. We have confirmed that stimulation of intraduodenal osmoreceptors inhibits gastric acid secretion in dogs, and we suggest that this is due, at least in part, to a suppression of gastrin release. We further suggest that duodenal osmolar inhibition of pancreatic secretion involves suppression of secretin but does not appear to involve cholecystokinin.
Toward the understanding of complex population dynamics: planktonic community as a model system
Authors: Yoshida Takehito 
Published: May 2005

AbstractEcologists have long been interested in understanding population dynamics in nature. Although theoretical ecologists have shown that mathematical models can represent various dynamic behaviors, and empirical ecologists have confirmed that some types of dynamics actually exist in nature, we do not yet completely understand how population dynamics are driven. The list of possible mechanisms driving population dynamics is still growing. Here I review studies of population dynamics carried out both in the field and in the laboratory by my colleagues and myself. I first describe some population dynamics of planktonic organisms living in freshwater lakes, then introduce some mechanisms driving population dynamics, for which theoretical and empirical evidence has only recently begun to accumulate. I also discuss how and why laboratory microcosms are a useful tool in the study of population dynamics. Future challenges to the advance of our understandings of complex population dynamics in nature lie where three different approaches intersect: time‐series data description, mathematical modeling, and laboratory and field experiments.
C‐type natriuretic peptide plasma levels increase in patients with chronic heart failure as a function of clinical severity
Authors: Del Ry Silvia , Passino Claudio , Maltinti Maristella , Emdin Michele , Giannessi Daniela 
Published: May 2005

AbstractBackgound:C‐type natriuretic peptide (CNP), secreted by the endothelium and the heart, is structurally related to atrial and brain natriuretic peptides, but its clinical significance in chronic heart failure (CHF) is controversial.Aim:To investigate the role of CNP in CHF, plasma CNP levels were determined in a prospective series of 133 patients with CHF (age 64±1 years, left ventricular ejection fraction (EF), 31.5±0.7%, mean±S.E.M.) and in 21 age‐matched healthy subjects.Methods and results:CNP was measured by a radioimmunoassay (sensitivity: 0.41±0.009 pg/tube) after a preliminary solid‐phase extraction. Plasma level of CNP in healthy subjects was 2.7±0.2 pg/ml and significantly increased in CHF, as a function of clinical severity: 4.9±0.7 pg/ml in NYHA class I; 7.0±0.4 pg/ml in class II (p<0.001 vs. controls); 9.6±0.7 pg/ml in class III (p<0.001 vs. controls and class I and II), and 11.8±2.0 pg/ml in class IV (p<0.001 vs. controls, class I and II; Fisher's test after ANOVA). A significant relation was also found between CNP plasma levels and EF (R=0.40, p<0.001).Conclusion:Plasma CNP elevation is related to clinical and functional disease severity. These findings suggest a pathophysiological role for this peptide that, for its vasorelaxing activity, could influence the endothelial vasomotor response in CHF.
Effects of Atorvastatin on Th polarization in patients with acute myocardial infarction
Authors: Cheng Xiang , Liao Yu‐Hua , Zhang Jinying , Li Bin , Ge Hongxia , Yuan Jing , Wang Min , Lu Baojun , Liu Ying , Cheng Yan 
Published: May 2005

AbstractBackground:The development of heart failure after acute myocardial infarction (AMI) has been shown to be associated with inflammation, which is positively and negatively regulated by T helper (Th) 1 and Th2 lymphocytes, respectively. Several studies have indicated that statins can improve heart function after AMI.Aims:To study the effects of atorvastatin on Th polarization in patients with AMI.Methods:Peripheral blood mononuclear cells were collected from 20 patients with AMI treated with oral atorvastatin (10 mg/d, group AMI‐A) and 18 patients with AMI (group AMI‐C) who did not receive treatment with statins. Cytokine‐producing Th lymphocytes were quantified by 3‐color flow cytometry. After in vitro culturing in the presence or absence of atorvastatin (0, 0.3, 1 and 3 μmol/L) for 6 days, cytokine‐producing Th lymphocytes were quantified again in AMI‐C group.Results:The ratio of IFN‐γ‐producing T cells was significantly higher in AMI‐C group (17.8%±6.4%) than in the AMI patients treated with oral atorvastatin (AMI‐A, 13.1%±4.6%). In vitro culturing with atorvastatin significantly reduced Th1 development in the AMI‐C group. There was no significant difference on the frequencies of interleukin (IL)‐4‐producing T cells between each group.Conclusions:Atorvastatin can reduce Th1 development but has no effect on Th2 cell‐functions in AMI patients. Our findings suggest that atorvastatin can regulate the polarization of Th1/Th2, this may be one of the mechanisms through which atorvastatin improves heart function after AMI.
“Pure” diastolic dysfunction is associated with long‐axis systolic dysfunction. Implications for the diagnosis and classification of heart failure
Authors: Vinereanu Dragos , Nicolaides Eleftherios , Tweddel Ann C. , Fraser Alan G. 
Published: May 2005

AbstractAimsTo investigate regional systolic function of the left ventricle, to test the hypothesis that “pure” diastolic dysfunction (impaired global diastolic filling, with a preserved ejection fraction ≥50%) is associated with longitudinal systolic dysfunction.Methods and resultsOne hundred thirty subjects (31 patients with asymptomatic diastolic dysfunction, 30 with diastolic heart failure, 30 with systolic heart failure; and 39 age‐matched normal volunteers) were studied by conventional and tissue Doppler echocardiography. Global diastolic function was assessed using the flow propagation velocity, and by estimating left ventricular filling pressure from the ratio of transmitral E and mitral annular ETDE velocities (E/ETDE); and global systolic function by measurement of ejection fraction. Radial and longitudinal functions were assessed separately from posterior wall and mitral annular velocities. Global and radial systolic function were similar in patients with “pure” diastolic dysfunction and normal subjects, but patients with either asymptomatic diastolic dysfunction or diastolic heart failure had impaired longitudinal systolic function (mean velocities: 8.0±1.2 and 7.7±1.5 cm/s, respectively, versus 10.1±1.5 cm/s in controls; p<0.001). In subjects with normal ejection fraction, global diastolic function correlated with longitudinal systolic function (r=0.56 for flow propagation velocity, and r=−0.53 for E/ETDE ratio, both p<0.001), but not with global systolic function.ConclusionWorsening global diastolic dysfunction of the left ventricle is associated with a progressive decline in longitudinal systolic function. Diastolic heart failure as conventionally diagnosed is associated with regional, subendocardial systolic dysfunction that can be revealed by tissue Doppler of long‐axis shortening. Diagnostic algorithms and definitions of heart failure need to be revised.