scholarly journals Computer-based determination of the newborn’s femoral head coverage using three-dimensional ultrasound scans

1998 ◽  
pp. 1024-1031 ◽  
Author(s):  
Heinrich M. Overhoff ◽  
Djordje Lazovic ◽  
Ute von Jan ◽  
Peter Heinze
Keyword(s):  
Femoral Head ◽  
Three Dimensional ◽  
Femoral Head Coverage ◽  
Computer Based

scholarly journals ASSESSMENT OF ACETABULAR COVERAGE IN BORDERLINE ACETABULAR DYSPLASIA: ARE PLAIN RADIOGRAPHIC PARAMETERS ACCURATELY ESTIMATES OF THREE-DIMENSIONAL COVERAGE?

2020 ◽  
Vol 8 (4_suppl3) ◽  
pp. 2325967120S0020
Author(s):  
Elizabeth Graesser ◽  
Maria Schwabe ◽  
Sean Akers ◽  
Cecilia Pascual-Garrido ◽  
John C Clohisy ◽  
...  
Keyword(s):  
Femoral Head ◽  
Low Dose ◽  
Acetabular Dysplasia ◽  
Three Dimensional ◽  
Poor Correlation ◽  
Acetabular Coverage ◽  
Moderate Correlation ◽  
Femoral Head Coverage ◽  
Acetabular Inclination ◽  
The Mean

Introduction: Assessment of anterior acetabular coverage is commonly done with measurement of the anterior center edge angle (ACEA) or anterior wall index (AWI). This is particularly important in cases of borderline acetabular dysplasia where it may influence treatment decisions. However, the ACEA and AWI has been poorly validated. Purpose: The purpose of the current study was to investigate the correlation between plain radiographic measurements and three-dimensional femoral head coverage on low-dose CT in borderline acetabular dysplasia. Methods: Seventy consecutive hips with borderline acetabular dysplasia (LCEA 20-25°) were included in the current study. Radiographic evaluation was performed prospectively including LCEA, acetabular inclination, and AWI on AP pelvis radiographs, and ACEA on false profile radiographs. The mean LCEA was 22.1±1.4°, while the mean acetabular inclination was 10.3±3.3. All patients underwent low-dose pelvic CT assessment for preoperative planning. The radial acetabular coverage was calculated according to the standardized clock-face position [measured at 12:00 (lateral), 1:00, 2:00, 3:00 (anterior), and 4:00] as described by Larson et al. Statistical analysis determined the correlation between ACEA and radial coverage. Results: The mean ACEA in the group was 25.3±5.8° (range 10.1-43.9), with 16% having ACEA≤20° and 50% having ACEA≤25°. The mean radial coverages were 63.5%±1.7 (12:00), 60.7%±2.2 (1:00), 50.8%±3.2 (2:00), 37.0%±3.3 (3:00), and 27.9%±3.1 (4:00). The ACEA had poor correlation with radial coverage at all positions from 12:00 to 4:00 (range –0.068-0.173). The AWI had moderate correlation with radial coverage at 3:00 (PCC 0.499) and 4:00 (PCC 0.573). Comparing hips with an ACEA <20° versus >20°, there was no difference between the mean radial acetabular coverage at any position 12:00-4:00 (p=0.18-0.95). Comparing hips with an ACEA <25° versus >25°, there was no difference between the mean radial acetabular coverage at any position 12:00-4:00 (p=0.12-0.71). No significant difference in AWI was present between subgroups with normal and deficient radial coverage from 12:00 to 4:00 (p=0.09-0.72). Discussion: The current study demonstrates poor correlation of the ACEA measurement with true anterior femoral head coverage as evaluated at clock-face positions from 12:00 to 4:00. The AWI demonstrated moderate correlation for 3:00-4:00 coverage but fails to differentiate hips with normal and deficient coverage. In the setting of borderline acetabular dysplasia, anterior and anterolateral femoral coverage should be assessed via low-dose CT rather than ACEA or AWI.

scholarly journals Three‐dimensional femoral head coverage in the standing position represents that measured in vivo during gait

2018 ◽  
Vol 31 (8) ◽  
pp. 1177-1183 ◽  
Author(s):  
Keisuke Uemura ◽  
Penny R. Atkins ◽  
Steve A. Maas ◽  
Christopher L. Peters ◽  
Andrew E. Anderson
Keyword(s):  
Femoral Head ◽  
Three Dimensional ◽  
Standing Position ◽  
Femoral Head Coverage

Conformation of Ribosomes from Escherichia Coli

1974 ◽  
Vol 32 ◽  
pp. 210-211
Author(s):  
M. Boublik ◽  
W. Hellmann ◽  
F. Jenkins
Keyword(s):  
Binding Sites ◽  
Ribosomal Proteins ◽  
Fluorescent Dyes ◽  
Protein Biosynthesis ◽  
Three Dimensional ◽  
Spatial Arrangement ◽  
Dimensional Structure ◽  
Complete Understanding ◽  
And Function

The present knowledge of the three-dimensional structure of ribosomes is far too limited to enable a complete understanding of the various roles which ribosomes play in protein biosynthesis. The spatial arrangement of proteins and ribonuclec acids in ribosomes can be analysed in many ways. Determination of binding sites for individual proteins on ribonuclec acid and locations of the mutual positions of proteins on the ribosome using labeling with fluorescent dyes, cross-linking reagents, neutron-diffraction or antibodies against ribosomal proteins seem to be most successful approaches. Structure and function of ribosomes can be correlated be depleting the complete ribosomes of some proteins to the functionally inactive core and by subsequent partial reconstitution in order to regain active ribosomal particles.

Determination of stress concentration in a plate near a hole in a three-dimensional test

1973 ◽  
Vol 5 (3) ◽  
pp. 311-314
Author(s):  
S. D. Bobritskaya ◽  
A. L. Kvitka
Keyword(s):  
Stress Concentration ◽  
Three Dimensional

scholarly journals Meso-Scale Transmission Electron Microscope Tomography Applied for Wax Distribution in Toner Particles

2013 ◽  
Vol 19 (S5) ◽  
pp. 58-61 ◽  
Author(s):  
Mino Yang ◽  
Jun-Ho Lee ◽  
Hee-Goo Kim ◽  
Euna Kim ◽  
Young-Nam Kwon ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Three Dimensional ◽  
Chromatic Aberration ◽  
Laser Printer ◽  
Medium Voltage ◽  
Transmission Electron ◽  
Z Contrast ◽  
Contrast Image

AbstractDistribution of wax in laser printer toner was observed using an ultra-high-voltage (UHV) and a medium-voltage transmission electron microscope (TEM). As the radius of the wax spans a hundred to greater than a thousand nanometers, its three-dimensional recognition via TEM requires large depth of focus (DOF) for a volumetric specimen. A tomogram with a series of the captured images would allow the determination of their spatial distribution. In this study, bright-field (BF) images acquired with UHV-TEM at a high tilt angle prevented the construction of the tomogram. Conversely, the Z-contrast images acquired by the medium-voltage TEM produced a successful tomogram. The spatial resolution for both is discussed, illustrating that the image degradation was primarily caused by beam divergence of the Z-contrast image and the combination of DOF and chromatic aberration of the BF image from the UHV-TEM.

scholarly journals A computer-based approach for developing linamarase inhibitory agents

2020 ◽  
Vol 5 (7) ◽  
Author(s):  
Lucas Paul ◽  
Celestin N. Mudogo ◽  
Kelvin M. Mtei ◽  
Revocatus L. Machunda ◽  
Fidele Ntie-Kang
Keyword(s):  
Structure Elucidation ◽  
Three Dimensional ◽  
Data Bank ◽  
Competitive Inhibitor ◽  
Industrial Applications ◽  
Dimensional Structure ◽  
Full Understanding ◽  
The Poor ◽  
Computer Based ◽  
Inhibitory Agents

AbstractCassava is a strategic crop, especially for developing countries. However, the presence of cyanogenic compounds in cassava products limits the proper nutrients utilization. Due to the poor availability of structure discovery and elucidation in the Protein Data Bank is limiting the full understanding of the enzyme, how to inhibit it and applications in different fields. There is a need to solve the three-dimensional structure (3-D) of linamarase from cassava. The structural elucidation will allow the development of a competitive inhibitor and various industrial applications of the enzyme. The goal of this review is to summarize and present the available 3-D modeling structure of linamarase enzyme using different computational strategies. This approach could help in determining the structure of linamarase and later guide the structure elucidation in silico and experimentally.

Sign in / Sign up

Export Citation Format

Share Document