748 research outputs found
A preliminary study of three-dimensional reconstruction of the human osseous labyrinth from micro-computed tomography scans
The adult human temporal bone was investigated using micro-CT scans. Various aspects of the osseous labyrinth were presented in figures which are effect of the volume rendering. The 3D reconstructions were performed to visualize the cochlea and the semicircular canals embedded in the petrous bone. The final product of this study was a digital three-dimensional model of the entire osseous labyrinth which can be viewed at different angles on the computer screen
Evidence for Charging Effects in CdTe/CdMgTe Quantum Point Contacts
Here we report on fabrication and low temperature magnetotransport
measurements of quantum point contacts patterned from a novel two-dimensional
electron system - CdTe/CdMgTe modulation doped heterostructure. From the
temperature and bias dependence we ascribe the reported data to evidence for a
weakly bound state which is naturally formed inside a CdTe quantum
constrictions due to charging effects. We argue that the spontaneous
introduction of an open dot is responsible for the replacement of flat
conductance plateaus by quasi-periodic resonances with amplitude less than
2e^{2}/h, as found in our system. Additionally, below 1 K a pattern of weaker
conductance peaks, superimposed upon wider resonances, is also observed.Comment: 4 pages, 4 figure
3-mercaptopyruvate sulfurtransferase and rhodanese activities in human myometrium and leiomyomas of the uterus
Micro-computed tomography study of the abnormal osseous extensions of sella turcica
The paper presents anatomical considerations on the abnormal ossification, which occurred around the dorsum of the sella turcica in the human skull of the female individual. Probably the morphological alterations of the sellar region were associated with extensive heterotopic ossification of the dura mater attached to the dorsum of the sella turcica and the posterior clinoid processes. The analysis of gray values of the voxels representing the areas of abnormal ossification indicated on variation in bone density in the entire sample. We have established that the highest mineralisation of bony tissue occurred in the marginal parts of the osseous extensions deriving from the posterior clinoid processes. The ossified parts of dura mater attached to the posterior clinoid processes showed significantly higher content of the hydroxyapatite (1.9 g/cm3) than the dorsum of the sella turcica (1.0 g/cm3)
The size of selected human skull foramina in relation to skull capacity
An anatomical study was undertaken in order to investigate whether the sizes of
selected human skull foramina with significant venous compartments correlated
significantly with skull capacity. A total of 100 macerated human skulls were
examined to determine the diameter of the foramina and the skull capacity.
Measurements of the surface area of the foramina were made using a computerised
digital analysis system.
Only the size of the hypoglossal canal and jugular foramen were found to correlate
significantly with the capacity of the skull. This correlation, together with
the considerable size of the hypoglossal canal, indicated its important role in the
venous drainage of the brain.
There was considerable centralisation of venous outflow from the brain, with
60% of the area of all venous foramina of the skull occupied by jugular foramina.
Asymmetry between the right and left jugular foramina was identified, with an
average ratio of 1.6 (ranging between 1 and 3.47). In the case of right-sided
domination the correlation between the skull capacity and the size of both jugular
foramina was negative (the larger the skull cavity, the less the asymmetry),
while in the case of left-sided domination the correlation was positive. Perhaps
the left-sided domination is less advantageous for the haemodynamics of blood
outflow, as the left brachiocephalic vein is longer and is often compressed by
the sternum and aortic arch
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