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  • Electronic Resource  (4)
  • 2005-2009
  • 1995-1999  (4)
  • magnetic resonance imaging  (2)
  • testosterone  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Motion and image artifacts of various intracranial aneurysm clips in a magnetic field (1996)
    Springer
    Acta neurochirurgica 138 (1996), S. 1241-1245 
    Details
    ISSN: 0942-0940
    Keywords: Intracranial aneurysm clip ; magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Deflection angles of 36 types of Sugita intracranial aneurysm clips (Elgiloy), 2 types of Yasargil clips (Phynox), A Kirschner chip (SUS316) and a silver clip were examined by suspending each in a 1.5-tesla MRI (TOSHIBA MRT-200/FXII). Image artifacts of 5 types of intracranial aneurysm clips were also studied quantitatively with respect to their ratio of artifcat/actual clip size using a spin-echo sequence with T1-weighted (Time of repetition (TR)=500 ms, Time of echo (TE)=20 ms) and T2-weighted (TR=2000 ms, TE=80 ms) images. All the Sugita clips from mini type to long type showed a deflection angle of less than 1.0 degree, the Yasargil clips less than 2.0 degrees, the Kirschner chip less than 6.0 degrees, and the silver chip did not move at all. Both brands of clips are therefore suitable for intracranial applications. The artifact size was directly proportional to the clip size and weight, though the ratio of artifact/actual width tended to decrease proportionately as the actual size and weight increased. The ratio of the width seemed slightly bigger than that of the length, but the difference did not reach statistical significance. There was no significant difference in the ratio of image artifacts/clip size between T1- and T2-weighted images.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01809754
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Cavernous malformations of the optic chiasma (1995)
    Springer
    Acta neurochirurgica 136 (1995), S. 29-36 
    Details
    ISSN: 0942-0940
    Keywords: Cavernous malformation ; optic chiasma ; magnetic resonance imaging ; surgery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Two cases of cavernous malformation of the optic chiasm are reported, and 12 previously reported cases are reviewed. The first patient presented with gradually progressive and the second patient with a subacute chiasmal syndrome. Total excision was performed in both cases. Visual function improved slightly after surgery in the first patient while the other showed marked improvement. Although cavernous malformations are angiographically occult, pre-operative diagnosis has become possible based on the characteristic features such as repeated haemorrhages in multiple sinusoidal structures as revealed by magnetic resonance imaging (MRI). A gliotic interspace between the malformation and normal neural tissue provides a plane of cleavage for dissection which permits total excision without causing new deficits. Review of previously reported cases revealed that chiasmal cavernous malformations haemorrhage more frequently than those in the brain. Early diagnosis with total excision is the treatment of choice for cavernous malformations of the optic chiasma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411432
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Reproduction related immunoglobulin changes in rainbow trout (1997)
    Springer
    Fish physiology and biochemistry 17 (1997), S. 415-421 
    Details
    ISSN: 1573-5168
    Keywords: fish ; trout ; reproduction ; seasonal changes ; immunoglobulin ; testosterone ; estradiol-17β ; 11-ketotestosterone ; water temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Annual changes in plasma immunoglobulin (IgM) levels were investigated in three strains of rainbow trout Oncorhynchus mykiss which have different spawning periods, i.e., September–October, November–December, and January, reared under constant water temperature and natural day length. Plasma IgM levels decreased during the spawning season in all strains tested. The IgM changes became reversed in response to significant increases in plasma testosterone (T) and estradiol-17β in females and T and 11-ketotestosterone in males. Though the IgM decline showed a connection with suppressed immunocompetence, since many mature fish caught fungal diseases, no clear differences were observed in the plasma IgM levels between infected and noninfected fish during the spawning season. Incidentally, plasma IgM levels in infection prone fish were higher than in noninfection prone fish prior to the spawning season, whereas coincident differences in the plasma steroid levels were observed. Immature fish reared under lower water temperatures showed lower IgM levels. The effect of water temperature may have to be considered when analyzing the defense mechanism during the spawning season in rainbow trout.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007795827112
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of steroid hormones on immunoglobulin M (IgM) in rainbow trout, Oncorhynchus mykiss (1999)
    Springer
    Fish physiology and biochemistry 20 (1999), S. 155-162 
    Details
    ISSN: 1573-5168
    Keywords: cortisol ; estradiol-17β ; 11-ketotestosterone ; mucus ; plasma ; testosterone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The immunosuppressive effects of steroid hormones were evaluated as the response against implanted steroid hormones, cortisol (F), testosterone (T), estradiol-17β (E2), and 11- ketotestosterone (11-KT), in juvenile rainbow trout. In long term experiments (5 weeks), fish were given a single intraperitoneal implant of F or T. A clear suppressive effect of plasma IgM levels with F and T was not necessarily obtained, although mucus IgM levels were reduced corresponding to the elevated plasma steroid hormone levels. In short term experiments (1 week), intraperitoneal implantation of T, 11-KT and E2 suppressed plasma and mucus IgM levels, although the effects were not dose-dependent. When administered through diet, F and T caused a suppression of plasma IgM levels; F administration at both high and low dosages caused a significant decrease in plasma IgM levels, while only a high dose of T caused the suppression. These results suggest that sex steroid hormones, as well as F, have immunosuppressive functions in rainbow trout.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007799617597
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    Paper (German National Licenses)
    Fulltext
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