julilili42/papers huggingface dataset:
Resonance frequency analysis and damping capacity assessment
2005-08-19

Abstract Objective: We compared the performance of damping capacity assessment (Periotest TM device) to resonance frequency analysis (Osstell TM device) in the assessment of peri‐implant bone loss in an in vitro experiment. Material and methods: Screw‐type oral implants were polymerized into acrylic blocks. Peri‐implant bone loss was simulated by successively removing defined portions of material surrounding the implants in millimeter increments. Measurement values of both devices were compared by assessing the associated measurement errors, by calculating correlation analyses and drawing scatterplots, and by means of regression analysis referring to increasing bone loss. Results: Both devices produced comparable results suggesting agreement of the measured implant stability values to the actual loss of peri‐implant resin. There was a noticeable correlation of the Periotest TM and Osstell TM implant stability values. Conclusion: The results of this experiment suggest agreement in predicting the actual implant stability with both the instruments with the Osstell TM instrument being the more precise device.
Resonance frequency analysis and damping capacity assessment
2005-08-19

Abstract Objectives: The aims of this in vitro study were to evaluate reliability of the Osstell TM and Periotest TM devices in the assessment of implant stability and to perform a method comparison. Material and methods: Commercial dental implants were inserted into bovine rib segments of different anatomical origins and densities. Repeated measurements were performed, varying (a) the torque‐in force of the devices' attachment screw (the Osstell TM transducer and the ball attachment, insert for the Periotest TM device), (b) the insertion site bone quality, and (c) the thread exposure in simulated peri‐implant bone defects. Results: Both methods were comparably reliable and showed a strong association to each other in the classification of implant stability. As opposed to torque‐forced screw attachment, the variations in bone composition, differences in inter‐implant stability of adjacent implants, and peri‐implant bone reduction were statistically significant for both methods. Conclusions: Both non‐invasive diagnostic devices seem to be useful in the long‐term follow‐up of implant integration.
Substantia nigra hyperechogenicity as a marker of predisposition and slower progression in Parkinson's disease
2005-08-19

Abstract Increased echogenic size (hyperechogenicity) of the substantia nigra (SN) is a characteristic transcranial sonography finding in patients with Parkinson's disease (PD). The SN echogenic size does not change in the course of the disease. In order to see whether this stable ultrasound marker may give any implications for the rate of PD progression, we sonographically investigated 16 PD patients in whom the rate of progression had been determined by serial 18‐fluorodopa positron emission tomography over a follow‐up period of 65.7 ± 26.7 months. We found a significant negative correlation between the right‐to‐left averaged SN echogenic size and the rate of disease progression in the caudate nucleus and in the putamen. There was a tendency towards a younger age at symptom onset in patients with SN hyperechogenicity. It may therefore be hypothesized that a differing influence of factors determining SN echogenicity early in life and impairing forces occurring later in life may account for different pathogenetic subgroups of idiopathic PD. © 2005 Movement Disorder Society
Terahertz surface impedance of epitaxial MgB2 thin film
2005-08-19

We report on terahertz (THz) surface impedance measurement of an epitaxial MgB2 thin film using time domain THz spectroscopy. We show that the surface resistance of the MgB2 film is much lower than that of YBa2Cu3O7−δ and copper in the THz range. A linear dependence of the surface reactance on frequency is observed, yielding a penetration depth of about 100nm at low temperatures. The measurements agree qualitatively with calculations based on impurity scattering in the Born limit. Our results clearly indicate that MgB2 thin films have a great potential for THz electronic applications.
Xenopus TRPN1 (NOMPC) localizes to microtubule-based cilia in epithelial cells, including inner-ear hair cells
2005-08-22

In vertebrates, the senses of hearing and balance depend on hair cells, which transduce sounds with their hair bundles, containing actin-based stereocilia and microtubule-based kinocilia. A longstanding question in auditory science is the identity of the mechanically sensitive transduction channel of hair cells, thought to be localized at the tips of their stereocilia. Experiments in zebrafish implicated the transient receptor potential (TRP) channel NOMPC (drTRPN1) in this role; TRPN1 is absent from the genomes of higher vertebrates, however, and has not been localized in hair cells. Another candidate for the transduction channel, TRPA1, apparently is required for transduction in mammalian and nonmammalian vertebrates. This discrepancy raises the question of the relative contribution of TRPN1 and TRPA1 to transduction in nonmammalian vertebrates. To address this question, we cloned the TRPN1 ortholog from the amphibian Xenopus laevis , generated an antibody against the protein, and determined the protein's cellular and subcellular localization. We found that TRPN1 is prominently located in lateral-line hair cells, auditory hair cells, and ciliated epidermal cells of developing Xenopus embryos. In ciliated epidermal cells TRPN1 staining was enriched at the tips and bases of the cilia. In saccular hair cells, TRPN1 was located prominently in the kinocilial bulb, a component of the mechanosensory hair bundles. Moreover, we observed redistribution of TRPN1 upon treatment of hair cells with calcium chelators, which disrupts the transduction apparatus. This result suggests that although TRPN1 is unlikely to be the transduction channel of stereocilia, it plays an essential role, functionally related to transduction, in the kinocilium.
Magnetic Resonance-Guided Percutaneous Radiofrequency Ablation of Renal Cell Carcinomas
2005-08-22

MRI-guided RF ablation of RCC in an interventional MR unit is safe and feasible. Fast MR imaging is a convenient method for rapid positioning of MR-compatible RF electrodes. MR monitoring of ablation procedure with T2-weighted imaging allows for immediate assessment of coagulation extent.
Production and characterization of amplified tumor-derived cRNA libraries to be used as vaccines against metastatic melanomas
2005-08-22

Abstract Background Anti-tumor vaccines targeting the entire tumor antigen repertoire represent an attractive immunotherapeutic approach. In the context of a phase I/II clinical trial, we vaccinated metastatic melanoma patients with autologous amplified tumor mRNA. In order to provide the large quantities of mRNA needed for each patient, the Stratagene CreatorTM SMARTTM cDNA library construction method was modified and applied to produce libraries derived from the tumors of 15 patients. The quality of those mRNA library vaccines was evaluated through sequencing and microarray analysis. Results Random analysis of bacterial clones of the library showed a rate of 95% of recombinant plasmids among which a minimum of 51% of the clones contained a full-Open Reading Frame. In addition, despite a biased amplification toward small abundant transcripts compared to large rare fragments, we could document a relatively conserved gene expression profile between the total RNA of the tumor of origin and the corresponding in vitro transcribed complementary RNA (cRNA). Finally, listing the 30 most abundant transcripts of patient MEL02's library, a large number of tumor associated antigens (TAAs) either patient specific or shared by several melanomas were found. Conclusion Our results show that unlimited amounts of cRNA representing tumor's transcriptome could be obtained and that this cRNA was a reliable source of a large variety of tumor antigens.
No evidence for the ‘Meselson effect’ in parthenogenetic oribatid mites (Oribatida, Acari)
2005-08-23

Abstract It has been hypothesized that in ancient apomictic, nonrecombining lineages the two alleles of a single copy gene will become highly divergent as a result of the independent accumulation of mutations (Meselson effect). We used a partial sequence of the elongation factor-1α (ef-1α) and the heat shock protein 82 (hsp82) genes to test this hypothesis for putative ancient parthenogenetic oribatid mite lineages. In addition, we tested if the hsp82 gene is fully transcribed by sequencing the cDNA and we also tested if there is evidence for recombination and gene conversion in sexual and parthenogenetic oribatid mite species. The average maximum intra-specific divergence in the ef-1α was 2.7% in three parthenogenetic species and 8.6% in three sexual species; the average maximum intra-individual genetic divergence was 0.9% in the parthenogenetic and 6.0% in the sexual species. In the hsp82 gene the average maximum intra-individual genetic divergence in the sexual species Steganacarus magnus and in the parthenogenetic species Platynothrus peltifer was 1.1% and 1.2%, respectively. None of the differences were statistically significant. The cDNA data indicated that the hsp82 sequence is transcribed and intron-free. Likelihood permutation tests indicate that ef-1α has undergone recombination in all three studied sexual species and gene conversion in two of the sexual species, but neither process has occurred in any of the parthenogenetic species. No evidence for recombination or gene conversion was found for sexual or parthenogenetic oribatid mite species in the hsp 82 gene. There appears to be no Meselson effect in parthenogenetic oribatid mite species. Presumably, their low genetic divergence is due to automixis, other homogenizing mechanisms or strong selection to keep both the ef-1α and the hsp82 gene functioning.
Mesoscopic Archimedean tilings in polymeric stars
2005-08-23

In [1] we announced the "thick layer" concept of the bulk terminations in quasicrystals.We consider a bundle of dense atomic planes in the bulk, not necessarily extremely close together, as a candidate for a termination.We show that only "thick" layers can terminate the bulk of decagonal Al-Cu-Co (d-AlCuCo) in the 2fold directions.Also, the secondary electron images indicate that certain "thick" 5fold and 2fold layers are favoured as terminations of icosahedral Al-Pd-Mn (i-AlPdMn).In particular, the 2fold terrace-like surfaces of i-AlPdMn containing pits are perfectly explained in this framework.Following a suggestion of Sharma et al. [2], that a gap in the bulk might define a termination, we introduce a minimum density rule on low density "thick" atomic layers as well and show that, in the framework of the model of i-AlPdMn, such a rule does not match the observed step heights on either the 2fold or 5fold surfaces.
Development of very-high rate and resolution neutron detectors in DETNI
2005-08-23

In [1] we announced the "thick layer" concept of the bulk terminations in quasicrystals.We consider a bundle of dense atomic planes in the bulk, not necessarily extremely close together, as a candidate for a termination.We show that only "thick" layers can terminate the bulk of decagonal Al-Cu-Co (d-AlCuCo) in the 2fold directions.Also, the secondary electron images indicate that certain "thick" 5fold and 2fold layers are favoured as terminations of icosahedral Al-Pd-Mn (i-AlPdMn).In particular, the 2fold terrace-like surfaces of i-AlPdMn containing pits are perfectly explained in this framework.Following a suggestion of Sharma et al. [2], that a gap in the bulk might define a termination, we introduce a minimum density rule on low density "thick" atomic layers as well and show that, in the framework of the model of i-AlPdMn, such a rule does not match the observed step heights on either the 2fold or 5fold surfaces.
Improvement of automated phase analysis by scaling on standard
2005-08-23

Generally a perovskite compound undergoes the phase transition through a cation substitution originating by ordering and tilting phenomena.Barium magnesium niobate, Ba(Mg 1/3 Nb 2/3 )O 3 (BMN) are typical compounds which have revealed 1:2 ordered structures with the trigonal symmetry.As the La substituted, the structure undergoes the phase transition by cubic, monoclinic [1,2].In this paper, we present the structural changes in accordance with the cation substitution of Sr by using neutron Rietveld refinement.Neutron powder diffraction data of the sample was obtained at room temperature using high resolution powder diffraction at Korea Atomic Energy Research Institute.The structure model of SMN was used the results deduced from the HRTEM experiments, which SMN has the antiphase tilting and 1:2 ordering.From the refinement, SMN has the monoclinic structure which has 1:2 ordering and antiphase tilting.The space group was determined to be C2/m (#12) with a(Å)=9.8042(2), b(Å)=13.7954(2),c(Å)=5.6310(1),=90.145(2) o , V=761.60(3)Å 3 .The structure of SMN is distorted by the antiphase tilting of oxygen octahedral with the a o b-b-system of the (MgNb)O 6 polyhedra.
Substitution of manganese by iron or gallium in electron-doped manganites
2005-08-23

before.In this report the results of structural studies of phase transitions in KNbO 3 powder specimens are presented.For preparation of KNbO 3 samples with different sizes of ideal crystal structure (crystallites or blocks) different synthesis conditions is used.The study of KNbO 3 phase transitions using X-ray difractometer DRON-3M (CuK radiation) and special temperature cell at 20 T 960 C is made.It is found that the decrease of coherent scattering areas below critical size (50 nm) lead to reduce of phase transition temperatures.It is established that there are strong changes of atomic positions and thermal parameters at these temperatures.
Phase transitions in tetrachlorobenzene studied by neutron powder diffraction
2005-08-23

before.In this report the results of structural studies of phase transitions in KNbO 3 powder specimens are presented.For preparation of KNbO 3 samples with different sizes of ideal crystal structure (crystallites or blocks) different synthesis conditions is used.The study of KNbO 3 phase transitions using X-ray difractometer DRON-3M (CuK radiation) and special temperature cell at 20 T 960 C is made.It is found that the decrease of coherent scattering areas below critical size (50 nm) lead to reduce of phase transition temperatures.It is established that there are strong changes of atomic positions and thermal parameters at these temperatures.
Maximum or minimum density principle determines the bulk terminations of quasicrystals?
2005-08-23

In [1] we announced the "thick layer" concept of the bulk terminations in quasicrystals.We consider a bundle of dense atomic planes in the bulk, not necessarily extremely close together, as a candidate for a termination.We show that only "thick" layers can terminate the bulk of decagonal Al-Cu-Co (d-AlCuCo) in the 2fold directions.Also, the secondary electron images indicate that certain "thick" 5fold and 2fold layers are favoured as terminations of icosahedral Al-Pd-Mn (i-AlPdMn).In particular, the 2fold terrace-like surfaces of i-AlPdMn containing pits are perfectly explained in this framework.Following a suggestion of Sharma et al. [2], that a gap in the bulk might define a termination, we introduce a minimum density rule on low density "thick" atomic layers as well and show that, in the framework of the model of i-AlPdMn, such a rule does not match the observed step heights on either the 2fold or 5fold surfaces.
Monitoring molecular metamorphosis using wide-angle solution scattering data
2005-08-23

Generally a perovskite compound undergoes the phase transition through a cation substitution originating by ordering and tilting phenomena.Barium magnesium niobate, Ba(Mg 1/3 Nb 2/3 )O 3 (BMN) are typical compounds which have revealed 1:2 ordered structures with the trigonal symmetry.As the La substituted, the structure undergoes the phase transition by cubic, monoclinic [1,2].In this paper, we present the structural changes in accordance with the cation substitution of Sr by using neutron Rietveld refinement.Neutron powder diffraction data of the sample was obtained at room temperature using high resolution powder diffraction at Korea Atomic Energy Research Institute.The structure model of SMN was used the results deduced from the HRTEM experiments, which SMN has the antiphase tilting and 1:2 ordering.From the refinement, SMN has the monoclinic structure which has 1:2 ordering and antiphase tilting.The space group was determined to be C2/m (#12) with a(Å)=9.8042(2), b(Å)=13.7954(2),c(Å)=5.6310(1),=90.145(2) o , V=761.60(3)Å 3 .The structure of SMN is distorted by the antiphase tilting of oxygen octahedral with the a o b-b-system of the (MgNb)O 6 polyhedra.
A high pressure high temperature study of Co-rich d-Al-Co-Ni
2005-08-23

In [1] we announced the "thick layer" concept of the bulk terminations in quasicrystals.We consider a bundle of dense atomic planes in the bulk, not necessarily extremely close together, as a candidate for a termination.We show that only "thick" layers can terminate the bulk of decagonal Al-Cu-Co (d-AlCuCo) in the 2fold directions.Also, the secondary electron images indicate that certain "thick" 5fold and 2fold layers are favoured as terminations of icosahedral Al-Pd-Mn (i-AlPdMn).In particular, the 2fold terrace-like surfaces of i-AlPdMn containing pits are perfectly explained in this framework.Following a suggestion of Sharma et al. [2], that a gap in the bulk might define a termination, we introduce a minimum density rule on low density "thick" atomic layers as well and show that, in the framework of the model of i-AlPdMn, such a rule does not match the observed step heights on either the 2fold or 5fold surfaces.
Diffuse scattering and phasons in the i-Zn-Mg-Sc phase and its 1/1 approximant
2005-08-23

In [1] we announced the "thick layer" concept of the bulk terminations in quasicrystals.We consider a bundle of dense atomic planes in the bulk, not necessarily extremely close together, as a candidate for a termination.We show that only "thick" layers can terminate the bulk of decagonal Al-Cu-Co (d-AlCuCo) in the 2fold directions.Also, the secondary electron images indicate that certain "thick" 5fold and 2fold layers are favoured as terminations of icosahedral Al-Pd-Mn (i-AlPdMn).In particular, the 2fold terrace-like surfaces of i-AlPdMn containing pits are perfectly explained in this framework.Following a suggestion of Sharma et al. [2], that a gap in the bulk might define a termination, we introduce a minimum density rule on low density "thick" atomic layers as well and show that, in the framework of the model of i-AlPdMn, such a rule does not match the observed step heights on either the 2fold or 5fold surfaces.
Total scattering: the key to the local and medium range structure of complex materials
2005-08-23

Generally a perovskite compound undergoes the phase transition through a cation substitution originating by ordering and tilting phenomena.Barium magnesium niobate, Ba(Mg 1/3 Nb 2/3 )O 3 (BMN) are typical compounds which have revealed 1:2 ordered structures with the trigonal symmetry.As the La substituted, the structure undergoes the phase transition by cubic, monoclinic [1,2].In this paper, we present the structural changes in accordance with the cation substitution of Sr by using neutron Rietveld refinement.Neutron powder diffraction data of the sample was obtained at room temperature using high resolution powder diffraction at Korea Atomic Energy Research Institute.The structure model of SMN was used the results deduced from the HRTEM experiments, which SMN has the antiphase tilting and 1:2 ordering.From the refinement, SMN has the monoclinic structure which has 1:2 ordering and antiphase tilting.The space group was determined to be C2/m (#12) with a(Å)=9.8042(2), b(Å)=13.7954(2),c(Å)=5.6310(1),=90.145(2) o , V=761.60(3)Å 3 .The structure of SMN is distorted by the antiphase tilting of oxygen octahedral with the a o b-b-system of the (MgNb)O 6 polyhedra.
Crystal structure refinement of Sr(Mg1/3Nb2/3)O3
2005-08-23

Generally a perovskite compound undergoes the phase transition through a cation substitution originating by ordering and tilting phenomena.Barium magnesium niobate, Ba(Mg 1/3 Nb 2/3 )O 3 (BMN) are typical compounds which have revealed 1:2 ordered structures with the trigonal symmetry.As the La substituted, the structure undergoes the phase transition by cubic, monoclinic [1,2].In this paper, we present the structural changes in accordance with the cation substitution of Sr by using neutron Rietveld refinement.Neutron powder diffraction data of the sample was obtained at room temperature using high resolution powder diffraction at Korea Atomic Energy Research Institute.The structure model of SMN was used the results deduced from the HRTEM experiments, which SMN has the antiphase tilting and 1:2 ordering.From the refinement, SMN has the monoclinic structure which has 1:2 ordering and antiphase tilting.The space group was determined to be C2/m (#12) with a(Å)=9.8042(2), b(Å)=13.7954(2),c(Å)=5.6310(1),=90.145(2) o , V=761.60(3)Å 3 .The structure of SMN is distorted by the antiphase tilting of oxygen octahedral with the a o b-b-system of the (MgNb)O 6 polyhedra.
cDNA microarray analysis reveals novel candidate genes expressed in human peripheral blood following exhaustive exercise
2005-08-24

It is generally accepted that exhausting endurance exercise exhibits strong effects on the immune system. Such effects have been attributed to changes in the cellular composition of peripheral blood as well as to changes in the expression of plausible candidate genes. The list of candidate genes is far from being complete, since this issue has not yet been investigated in a systematic way. In this study, we used a custom-made cDNA microarray focused on inflammation as a screening approach to study gene expression in eight one-half marathon runners before, immediately after, and 24 h after exercise. Significant differential gene expression was verified by quantitative real-time PCR. Linear regression analysis showed that microarray expression analysis of cell type-specific surface molecules reflects the observed individual cellular shifts in peripheral blood cells with high statistical significance. In line with the results of former studies, we observed an upregulation of mitogen-activated protein kinase-activated protein kinase-2 (MAPKAP-K2), l-selectin, and IL-1 receptor antagonist (IL-1ra) after exhaustive exercise. The main results of this study report, for the first time, the downregulation of CD81; the upregulation of thioredoxin, which may play an important part in anti-oxidative defense; and, surprisingly, the downregulation of the anti-carcinogenic gene glutathione- S-transferase-3 (GSTM3) in peripheral blood. The study shows cDNA microarray expression analysis as a reliable systematic instrument to complete the list of candidate genes that may play a role in exhaustive exercise-induced modulation of the immune response.