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21.
Eva-Maria Brick Heike Rudolph Jens Arnold Ralph G Luthardt 《Computerized medical imaging and graphics》2004,28(3):159-165
The three-dimensional (3D) evaluation and comparison of free-form-surfaces is a complex problem [Dent. Mater. 8 (1992) 49; J. Dent. Res. 76 (1997) 1799; Dent. Mater. 16 (2000) 145; J. Prosthet. Dent. 70 (1993) 457; Dent. Mater. 19 (2003) 19]. However, it is essential in order to analyze the sinter shrinkage of dental ceramic-restorations where isotropic and linear shrinkage is desired for accurate fit on the prepared teeth. In this article, we examine the 3D sinter shrinkage in general and for nine copings from alumina in particular. Using various scaled CAD-models in an iteration scheme, each model was compared to the filtered point cloud of the coping, determining the surface-cloud difference. The magnitude of deviations from linear sinter shrinkage was investigated. Furthermore, a new fabrication process for ceramic-restorations is introduced. 相似文献
22.
Andon R Kossev Sabine Siggelkow Reinhard Dengler Jens D Rollnik 《Journal of clinical neurophysiology》2003,20(1):54-58
The influence of the intensity of the conditioning stimulus on intracortical inhibition (ICI) and intracortical facilitation (ICF) was assessed in a study using paired-pulse transcranial magnetic stimulation. Interstimulus intervals (ISIs) between conditioning and test stimuli were 3 msec and 13 msec. Latencies and areas of motor evoked potentials in response to the test stimulus were measured in the right extensor carpi radialis muscle. Motor evoked potential areas with ISIs of 3 msec and 13 msec showed a different dependence on the intensity of the conditioning stimulus. In contrast, the changes of motor evoked potential latencies were fairly similar with both ISIs. The findings point to a parallel action of ICI and ICF. Furthermore, the latencies seem to be a more sensitive indicator for ICF action than the size parameters of motor evoked potentials. 相似文献
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25.
Jens Jordan 《Clinical autonomic research》2007,17(6):331-333
Genes influencing the autonomic nervous system continue as a focus of research. Recent publications applied different methods
to identify genes influencing autonomic cardiovascular regulation in humans. Two reports relied on a candidate gene approach.
Common genetic polymorphisms in the promoter region of the tyrosine hydroxylase gene were shown to influence catecholamine
synthesis and blood pressure. The same group tested the hypothesis that the GTP cyclohydrolase 1 (GCH1) gene influences catecholamine
excretion and cardiovascular regulation. GCH1 affects tyrosine hydroxylase function indirectly. The authors concluded that
the GCH1 gene may influence cardiovascular autonomic regulation through changes in nitric oxide production rather than a change
in tyrosine hydroxylase activity. The third genetic study used a single nucleotide polymorphism chip to analyze 100,000 genetic
polymorphisms scattered throughout the genome in participants of the Framingham study. The authors identified several polymorphisms
that may influence QT interval duration, heart rate, and heart rate variability. The respective genes have not been identified
with certainty. Another study suggested that catecholamines may be released from phagocytes and regulate pulmonary inflammation
through alpha-2 adrenoreceptor activation in an autocrine or paracrine fashion. 相似文献
26.
Henrik Husted S ren Overgaard Jens Ole Laursen Klaus Hinds Lise N rrekjaer Hansen Harald M. Knudsen Niels B. Mossing 《Acta orthopaedica》1996,67(5):421-423
During the 10-year period 1981-1990, 1, 199 patients in the county of South Jutland, Denmark, had 1, 477 primary total hip arthroplasties (THA) performed because of primary arthrosis (OA).
The patients were followed until the end of 1994, with a mean follow-up of 5.6 (0-14) years. Bilateral operations were performed on 356 patients, whereas 248 patients had died with only 1 THA.
The cumulated risk of replacement of the contralateral hip was approximately 0.15 1 year after replacement of the first hip, 0.20 after 2 years, 0.29 after 5 years and 0.47 after 10 years, respectively.
During the follow-up period, the demand for a THA of the contralateral hip continued to be approximately 15 times higher than in the general population. 相似文献
The patients were followed until the end of 1994, with a mean follow-up of 5.6 (0-14) years. Bilateral operations were performed on 356 patients, whereas 248 patients had died with only 1 THA.
The cumulated risk of replacement of the contralateral hip was approximately 0.15 1 year after replacement of the first hip, 0.20 after 2 years, 0.29 after 5 years and 0.47 after 10 years, respectively.
During the follow-up period, the demand for a THA of the contralateral hip continued to be approximately 15 times higher than in the general population. 相似文献
27.
Klaus-Dietmar Merboldt Gunnar Krüger Wolfgang Hnicke Andreas Kleinschmidt Jens Frahm 《Magnetic resonance in medicine》1995,34(4):639-644
Functional mapping of human brain activation has been accomplished at high spatial and temporal resolution (voxel size 4.9 μl, temporal increment 100 ms). The approach was based on oxygenation-sensitive long-echo time FLASH MRI sequences synchronized to multiply repeated cycles of visual stimulation in a CINE acquisition mode. This high temporal resolution revealed that stimulus-related signal intensity changes in human visual cortex display an initial latency followed by increases extending over several seconds. Furthermore, the temporal characteristics of the complete CINE MRI signal time course depended on the absolute and relative durations of activation and control periods and, for example, caused an apparent absence of a poststimulation “undershoot” phenomenon. Complementing hyperoxygenation due to rapid hemodynamic adjustments, these results suggest signal intensity modulation by enhanced oxygen consumption and concomitant deoxygenation during prolonged and/or repetitive stimulation. 相似文献
28.
Liehr M Haueisen J Goernig M Seidel P Nenonen J Katila T 《Annals of biomedical engineering》2005,33(2):240-247
Recent studies reported differential information in human magnetocardiogram and in electrocardiogram. Vortex currents have been discussed as a possible source of this divergence. With the help of physical phantom experiments, we quantified the influence of active vortex currents on the strength of electric and magnetic signals, and we tested the ability of standard source localization algorithms to reconstruct vortex currents. The active vortex currents were modeled by a set of twelve single current dipoles arranged in a circle and mounted inside a phantom that resembles a human torso. Magnetic and electric data were recorded simultaneously while the dipoles were switched on stepwise one after the other. The magnetic signal strength increased continuously for an increasing number of dipoles switched on. The electric signal strength increased up to a semicircle and decreased thereafter. Source reconstruction with unconstrained focal source models performed well for a single dipole only (less than 3-mm localization error). Minimum norm source reconstruction yielded reasonable results only for a few of the dipole configurations. In conclusion active vortex currents might explain, at least in part, the difference between magnetically and electrically acquired data, but improved source models are required for their reconstruction. 相似文献
29.
The Role of APO-1-Mediated Apoptosis in the Immune System 总被引:12,自引:0,他引:12
30.
APO-1(CD95)-dependent and -independent antigen receptor-induced apoptosis in human T and B cell lines 总被引:3,自引:0,他引:3
Peter Marcus E.; Dhein Jens; Ehret Andreas; Hellbardt Stefan; Walczak Henning; Moldenhauer Gerhard; Krammer Peter H. 《International immunology》1995,7(11):1873-1884
Certain B and T cell lines respond to activation signals, e.g.through the antigen receptor, by undergoing apoptotlc cell death.In T cells it has been recently shown that TCR-mediated apoptosisinvolves APO-1/Fas (CD95) receptor-ligand interaction. To investigatewhether the TCR-CD3 complex can trigger alternative apoptosispathways we generated subclones of the T cell line Jurkat whichwere completely resistant towards APO-1-mediated apoptosis.These JurkatR cells differed phenotypically from sensitive parentalJurkatS cells only by the lack of APO-1 protein expression.Although JurkatR cells responded normally to anti-CD3 stimulationby expression of APO-1 ligand they failed to undergo anti-CD3-inducedapoptosis. Thus, in Jurkat cells APO-1 -mediated apoptosis wasthe main, and might be the only, mechanism for anti-CD3-inducedcell death. However, BL-60 B cells, highly sensitive to anti-IgM-inducedapoptosis, did not use the APO-1 receptor-ligand system becausethey failed to express APO-1 ligand mRNA. Taken together, ourresults suggest that malignant T and B cell lines may use APO-1receptor-ligand-dependent and -independent antigen receptor-inducedapoptosis pathways respectively. Similarly, differential pathwaysmay be used by T and B cell subsets. 相似文献