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  • Articles: DFG German National Licenses  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Optically induced rotation of anisotropic micro-objects fabricated by surface micromachining (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 2209-2210 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optical trapping and directional high-speed rotation by radiation pressure are demonstrated for anisotropic micro-objects fabricated by reactive ion-beam etching. These micro-objects, which have shape dissymmetry (not bilateral symmetry but rotational symmetry) in the horizontal cross section, rotate about the laser beam axis in the designed direction in a liquid medium (e.g., water or alcohol). The rotation speed is almost proportional to the input laser power.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111675
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Imaging in primary progressive aphasia (1997)
    Springer
    Neuroradiology 39 (1997), S. 556-559 
    Details
    ISSN: 1432-1920
    Keywords: Key words Aphasia ; primary progressive ; Magnetic resonance imaging ; Single photon emission computed tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Primary progressive aphasia (PPA) presents with aphasia, with or without other minor cognitive dysfunction. We report five patients with PPA to show the correlation between their clinical signs and imaging findings. The patients can be divided into those with nonfluent (group 1) and those with fluent (group 2) aphasia. The characteristic speech impairment was bradylalia in group 1 and word amnesia in group 2. Impairment of comprehension was common but mild in both groups. On MRI, patients in group 1 showed predominantly left frontal and perisylvian atrophy with reduced uptake in the same region on single photon emission computed tomography (SPECT) using technetium-99m hexamethyl propyleneamine oxime (99mTc HMPAO). Patients in group 2 showed left temporal atrophy involving the superior, middle and inferior temporal gyri, hippocampus and parahippocampal gyrus on MRI and reduced uptake in the same region on SPECT. These findings correlated well with the functional anatomy of speech impairment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002340050466
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Crossed cerebellar diaschisis in chronic Broca's aphasia (1997)
    Springer
    Neuroradiology 39 (1997), S. 624-626 
    Details
    ISSN: 1432-1920
    Keywords: Key words Broca's aphasia ; Diaschisis ; cerebellar ; Single photon emission computed tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The cerebellum has anatomical connections to the cerebral cortex, through which it can affect language function. To study these connections, we investigated patients with chronic Broca's aphasia using MRI and single-photon emission computed tomography (SPECT). We selected 15 such patients (9 male, 6 female, aged 17–64 years, mean age 56 years) from 30 chronically aphasic patients. Using the results of SPECT, we divided them into patients with (group 1) and without (group 2) crossed cerebellar diaschisis (CCD). We compared the language function of the two groups. Patients in group 1 showed classical Broca's aphasia, while patients in group 2 showed mainly word-finding difficulty. Patients with CCD hat infarcts involving the lower part of the frontal gyrus but patients without CCD did not, which suggests that this region may have functional and anatomical connections with the cerebellum. Our findings support the notion that the cerebellum contributes to language.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002340050480
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    Paper (German National Licenses)
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