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  • 1
    Digitale Medien
    Digitale Medien
    Transmitter-Like Release of Endogenous 3,4-Dihydroxyphenylalanine from Rat Striatal Slices (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 50 (1988), S. 0 
    Details
    ISSN: 1471-4159
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Abstract: Biphasic electrical field stimulation (0.5–5 Hz, 2 ms, 25 V, 3 min) and high K+ (10–30 mM, 5 min) released endogenous 3,4-dihydroxyphenylalanine (DOPA) from superfused rat striatal slices. Characteristics of the DOPA release were compared with those of 3,4-dihydroxyphenylethylamine (dopamine, DA). Electrical stimulation at 2 Hz evoked DOPA and DA over similar time courses, α-Methyl-p-tyrosine (0.2 mM) markedly reduced release of DOPA but not of DA. Maximal release (0.3 pmol) of DOPA was obtained at 2 Hz and at 15 mM K+. The impulse-evoked release of DOPA and DA was completely tetrodotoxin (0.3 μM) sensitive and Ca2+ dependent and the 15 mM K+-evoked release was also Ca2+ dependent. On l-[3,5-3H]tyrosine (1 μM) superfusion, high K+ (15 and 60 mM) released DOPA and DA together with concentration-dependent decreases in tyrosine 3-monooxygenase (EC 1.14.16.2) activity as indicated by [3H]H2O formation, followed by concentration-dependent increases after DOPA and DA release ended. These findings suggest that striatal DOPA is released by a Ca2+-dependent excitation-secretion coupling process similar to that involved in transmitter release.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1471-4159.1988.tb02470.x
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  • 2
    Digitale Medien
    Digitale Medien
    Fluorescence extended x-ray absorption fine structure study on local structures around Mn atoms in thin (In, Mn)As layer and (In, Mn)As quantum dots (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 66-70 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have investigated thin (In, Mn)As layer and (In, Mn)As quantum dots (with Mn mole fraction lower than 0.02) on GaAs(001) by fluorescence extended x-ray absorption fine structure (EXAFS) in order to study the local structures formed around the Mn atoms. The EXAFS analysis revealed that in a 10 nm thick (In, Mn)As layer, the In-site substitutional Mn and the NiAs-type MnAs coexisted, while the majority of the Mn atoms were substituted in the In-sites of InAs in (In, Mn)As quantum dots. It is considered that different growth modes for the thin layer and the quantum dots affect the local structures. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1330761
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  • 3
    Digitale Medien
    Digitale Medien
    Rapid healing of intractable diabetic foot ulcers with exposed bones following a novel therapy of exposing bone marrow cells and then grafting epidermal sheets (2004)
    Oxford, UK : Blackwell Science Ltd
    British journal of dermatology 151 (2004), S. 0 
    Details
    ISSN: 1365-2133
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Background  Diabetic foot ulcers with exposed bones commonly result in amputation.Objectives  To determine whether exposure of bone marrow cells and subsequent grafting of epidermal sheets accelerates healing and reduces the need for amputation.Methods  Thirty-eight patients with chronic wounds caused by diabetes mellitus were enrolled in this study. Epidermal sheets obtained from suction blisters of each patient were grafted on to diabetic foot ulcers without exposed bones (n = 10) and were compared with the standard treatment of local wound care, debridement with a scalpel when indicated, bed rest and parenteral antibiotics (n = 8). In another group of patients, diabetic wounds with exposed bones were treated either with the standard procedure (n = 9) or with a newly developed experimental procedure (n = 11). In that new procedure, the affected bone was initially exposed by debridement with a scalpel, followed by partial excision with a bone scraper until fresh bleeding was observed from the exposed bone. The lesions were then immediately covered with an occlusive dressing, and finally the wound was covered with an epidermal graft of skin harvested from suction blisters. Patients in each group were matched with their counterparts by age, sex, wound size, wound infection and wound duration, to compare the time needed for total skin repair and rates of amputation.Results  Epidermal grafting significantly accelerated the healing of diabetic foot ulcers (P = 0·042) without exposed bones, with site-specific differentiation. The newly developed combination therapy resulted in the healing of all diabetic ulcers with exposed bones without the occurrence of osteomyelitis or the necessity for amputation (P 〈 0·0001).Conclusions  Our study indicates that early aggressive debridement of diabetic foot ulcers with exposed bones down to a bleeding vascularized base and then grafting epidermal sheets significantly improves healing and reduces the rate of amputation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2133.2004.06170.x
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  • 4
    Digitale Medien
    Digitale Medien
    Lateral inhibition and habituation of the human auditory cortex (2004)
    Oxford, UK : Blackwell Science Ltd
    European journal of neuroscience 19 (2004), S. 0 
    Details
    ISSN: 1460-9568
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: The goal of this study was to compare the lateral inhibition and the habituation in the human auditory cortex, two important physiological effects during auditory processing that can be reliably measured by means of magnetoencephalography when recording auditory evoked fields. Applying 40-Hz amplitude-modulated stimuli allowed us to record simultaneously the slow transient evoked and the steady-state fields and thus to characterize the lateral inhibition and the habituation effect in primary and non-primary auditory cortical structures. The main finding of the study is that the lateral inhibition effect of non-primary auditory areas as measured on the major component of the slow transient auditory evoked field (N1) is significantly stronger than the corresponding habituation effect. By contrast, this effect was not observed for the 40-Hz steady-state fields, characterizing the activation of the primary auditory cortex in humans. The results might be interpreted as (i) evidence that the inhibition mediated by lateral connections is stronger than the habituation of excitatory neurons in the non-primary auditory cortex and (ii) the processing hierarchy in the human auditory cortex is demonstrated by the different behaviour of lateral inhibition and habituation in primary and non-primary auditory cortical structures.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.0953-816X.2004.03296.x
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  • 5
    Digitale Medien
    Digitale Medien
    Involvement of central catecholamines in mediation of pressor responses of the rat to carotid occlusion (1985)
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 328 (1985), S. 348-350 
    Details
    ISSN: 1432-1912
    Schlagwort(e): Carotid occlusion ; Transection of the spinal cord ; 6-Hydroxydopamine ; Guanethidine ; Arterial pressure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Carotid occlusion evoked a pressor response in rats after transection of the spinal cord. Intraventricular pretreatment with 6-hydroxydopamine inhibited the pressor response. The pressor response to occlusion was also diminished by the intraventricular but not by the intravenous injection of guanethidine. Intravenous atropine or mecamylamine, or intraventricular captopril did not affect the pressor response. Thus, it appears that central catecholaminergic mechanisms are involved in the mediation of the pressor response to carotid occlusion.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00515565
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  • 6
    Digitale Medien
    Digitale Medien
    Caudal ventrolateral medulla (1985)
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 328 (1985), S. 368-372 
    Details
    ISSN: 1432-1912
    Schlagwort(e): Ventrolateral medulla ; Spinal transection ; Pressor response ; Glutamate ; Kainic acid ; Vasopressin antagonist
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary We localized glutamate-sensitive sites in the ventrolateral medulla of the rat with the spinal cord cut at C1. When unilaterally injected into a circumscribed region of the caudal ventrolateral medulla,l-glutamate (30–300 ng) elicited a dose-dependent increase in arterial pressure. The pressor response was accounted for by an increased release of vasopressin because it was abolished by the intravenous injection of a vasopressin antagonist. Bilateral microinjections of kainic acid (50 ng) into the ventrolateral glutamate-sensitive area markedly reduced a vasopressin-induced pressor response to kainic acid (30 ng), injected bilaterally into the nucleus tractus solitarii. It is concluded that the glutamate-sensitive neurons in the caudal ventrolateral medulla are involved in mediation of the vasopressin-induced pressor response arising from the nucleus tractus solitarii.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00692902
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  • 7
    Digitale Medien
    Digitale Medien
    Cardiovascular effects in rats of alpha1 and alpha2 adrenergic agents injected into the nucleus tractus solitarii (1987)
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 335 (1987), S. 274-277 
    Details
    ISSN: 1432-1912
    Schlagwort(e): Alpha1 adrenoceptors ; Alpha2 adrenoceptors ; Arterial pressure ; Nucleus tractus solitarii
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The cardiovascular effects of selective alpha1 and alpha2 agonists and antagonists injected into the nucleus tractus solitarii (NTS) were studied in urethane-anesthetized rats. Methoxamine (0.3–3 μg) injected bilaterally into the NTS caused a dose-dependent increase in blood pressure and heart rate. Phenylephrine (6 μg) and an imidazolidine derivative St 587 (3 μg) similarly injected also produced an increase in blood pressure, whereas a-methylnoradrenaline and an azepine derivative B-HT 920 (1 and 3 μg) caused a decrease in blood pressure and heart rate. The pressor response to methoxamine (1 μg) was markedly inhibited by prazosin (0.3 pg) injected into the same sites or hexamethionum (25 mg/kg, i. v.). Prazosin (0.3 μg) alone injected bilaterally into the NTS did not affect the blood pressure, while yohimbine (0.1 μg) similarly injected increased the pressure. These results suggest that in the rat NTS there exist alpha1 adrenoceptors responsible for an increase in arterial pressure. The NTS alpha2 adrenoceptors seem to be involved in the tonic regulation of arterial pressure.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00172796
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  • 8
    Digitale Medien
    Digitale Medien
    Involvement of spinal alpha adrenoceptors in mediation of the hypotensive action of guanabenz in rats (1988)
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 337 (1988), S. 122-124 
    Details
    ISSN: 1432-1912
    Schlagwort(e): Alpha adrenoceptors ; Spinal cord ; Guanabenz ; Yohimbine ; Arterial pressure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The effects of intrathecal, intracisternal and intravenous injections of yohimbine (10 μg) on hypotensive and bradycardic responses to the alpha agonist guanabenz (10 μg/kg, i.v.) were studied in anesthetized rats. The depressor response to guanabenz was inhibited by intrathecal pretreatment with yohimbine, while this pretreatment did not affect the bradycardic response to guanabenz. Intracisternal pretreatment with yohimbine inhibited both cardiovascular responses to guanabenz, whereas intravenous pretreatment with yohimbine affected neither. Guanabenz (1 μg) decreased blood pressure when injected intrathecally but did not affect it when injected intravenously. These results suggest that in rats spinal alpha adrenoceptors are involved in mediation of the hypotensive action of the alpha agonist guanabenz injected systemically.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00169489
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  • 9
    Digitale Medien
    Digitale Medien
    Changes in microflora of a puffer fish Fugu niphobles, with different water temperatures (1989)
    Springer
    Marine biology 101 (1989), S. 299-304 
    Details
    ISSN: 1432-1793
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Grass puffer Fugu niphobles, captured in November 1986 at Shimoda, Japan, and then reared at different temperatures ranging from 10 to 29°C, was examined for microflora changes in the skin, gill and intestines. At 10°C, the skin and gill were colonized mainly by Pseudomonas, Flavobacterium and Moraxella, while at 29°C Vibrio and Flavobacterium appeared abundantly. The intestinal microflora, consisting of Vibrio, Pseudomonas and Flavobacterium, revealed little temperature dependence, although the intrageneric composition of Vibrio changed conspicuously depending on the change of water temperature. Vibrio group 1, tentatively identified as V. alginolyticus, was detected in all tissues examined at 20 and 29°C. This, along with the fact that V. alginolyticus produces tetrodotoxin, suggests that the tetrodotoxin contained in puffer is, at least partly, accounted for by this bacterial species inhabiting intestines.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00428125
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  • 10
    Digitale Medien
    Digitale Medien
    Deep Levels in Bulk-ZnSe Grown by Bridgman Method (2001)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 78-79 (Apr. 2001), p. 367-376 
    Details
    ISSN: 1662-9779
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/26/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.78-79.367.pdf
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