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  • Inorganic Chemistry  (19)
  • locomotion  (3)
  • Carotid Body  (2)
  • EPR  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Flow measurement in the carotid body of the cat by the hydrogen clearance method (1972)
    Springer
    Pflügers Archiv 336 (1972), S. 217-224 
    Details
    ISSN: 1432-2013
    Schlagwort(e): H2 Clearance ; Carotid Body ; Blood Flow ; Chemoreceptor Function
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary A technique is described which enables the determination of local blood flow in different points of the carotid body. The blood flow measured in the middle zone of the catorid body at mean blood pressure of 120 to 130 mm Hg was about 2000 ml/100 gxmin and corresponded to the total flow values known thus far. It was found that the flow/g weight decreases from the arterial inflow towards the periphery. Under our experimental conditions no signs of autoregulation could be detected. Under special experimental conditions differnnt flow distributions were observed in the carotid body.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00590046
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  • 2
    Digitale Medien
    Digitale Medien
    The relationship between neuronal activity of chemoreceptor fibers and tissue $$P_{O_2 }$$ of the carotid body of the cat during changes in arterial $$P_{O_2 }$$ and blood pressure (1973)
    Springer
    Pflügers Archiv 343 (1973), S. 287-296 
    Details
    ISSN: 1432-2013
    Schlagwort(e): Carotid Body ; Chemoreceptor Activity ; Tissue $$P_{O_2 }$$ ; Local Blood Flow
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The relationship between $$P_{GO_2 }$$ , $$P_{aO_2 }$$ , local blood flow, and the activity of individual chemoreceptor fiber units of the cat's carotid body was studied during changes in the arterial oxygen partial pressure and the arterial systemic blood pressure. The following results were obtained: 1. In the normal physiological range $$P_{GO_2 }$$ follows $$P_{aO_2 }$$ almost linearly. 2. The curves of neuronal activity depending on $$P_{aO_2 }$$ or $$P_{GO_2 }$$ have different shapes. 3. Hypoxia and hyperoxia change the relationship between $$P_{aO_2 }$$ and $$P_{GO_2 }$$ as well as the relationship to the neuronal activity. When returning to normal conditions, the initial relationship is re-established. 4. Considerable changes in local flow do not change local tissue $$P_{O_2 }$$ and do not influence the neuronal activity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00595816
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  • 3
    Digitale Medien
    Digitale Medien
    Electron Paramagnetic Resonance of Tb3+ Ions in YBa2Cu3O6 (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 895-897 
    Details
    ISSN: 1572-9605
    Schlagwort(e): EPR ; YBCO ; rare-earth ions ; impurities
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The first observation of electron paramagnetic resonance (EPR) of Tb3+ doped into YBa2Cu3O6 is reported. EPR is used to determine the local symmetry of the rare-earth ion and to study the effect of suppression of high-T c superconductivity by doping. The distance between the lowest singlets of Tb3+ ion Δ ≅ 7.1 GHz ≡ 0.24 cm−1 and g-factor g ∥ ≃ 17.9 have been estimated from measurements. Both these parameters are in a good agreement with the corresponding calculated values. No evidence of Tb4+ ions was found.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1026477519347
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  • 4
    Digitale Medien
    Digitale Medien
    Tilting Mode Relaxation and Oxygen Isotope Effect in La2−xSrxCuO4 Studied by Electron Paramagnetic Resonance (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 955-958 
    Details
    ISSN: 1572-9605
    Schlagwort(e): EPR ; LSCD ; isotope effect
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The electron paramegnetic resonance (EPR) of Mn2+ doped into La2−x Sr x CuO4 was used to probe the copper spin relaxation via the bottleneck effect for oxygen isotope (16O and 18O)–substituted samples. It was found that the EPR linewidth is larger for the 18O isotope samples than for the 16O samples. For x = 0.03, the linewidth for the 18O sample is larger than for 16O sample by a factor of 2. The isotope effect is pronounced at low temperatures and decreases with increasing Sr concentration. This effect is quantitatively explained by the Cu2+ S = 1/2 spin relaxation to the lattice via Dzyaloshinski terms coupled linearly to the local Q 4/Q 5 tilting modes of the CuO6 octahedra as proposed by Kochelaev et al. [1] The Q 4/Q 5 modes are coupled sterically to the Q 2 Jahn–Teller modes considered to be relevant for the (bi)-polaron formation and thus for the high-temperature superconductivity (HTSC).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1026498123890
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  • 5
    Digitale Medien
    Digitale Medien
    Orthokinetic and klinokinetic responses of human polymorphonuclear leucocytes (1985)
    New York, NY : Wiley-Blackwell
    Cell Motility and the Cytoskeleton 5 (1985), S. 447-461 
    Details
    ISSN: 0886-1544
    Schlagwort(e): chemokinesis ; orthokinesis ; klinokinesis ; polymorphonuclear leucocytes ; locomotion ; Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: Evidence is presented to show that klinokinesis, which was previously demonstrated in bacteria and amoeba only, may also occur in metazoan cells. The chemotactic peptide formyl-Met-Leu-Phe (fMLP) elicited orthokinetic and klinokinetic responses of human blood-borne polymorphonuclear leucocytes (PMNs) under the test conditions used. Increased speed (orthokinesis) was due to an increase in the proportion of migrating cells as well as in the speed of the locomoting subset. The klinokinetic effect was manifested by a decrease in the klinolocomotion index, the mean angle of changes in direction ≥ 90°, and the frequency of turns ≥ 90°. The klinolocomotion index was inversely related to speed. This explains the synergistic effect of klinokinesis and orthokinesis in this system. Colchicine alone had and orthokinetic effect which was exclusively due to alterations in the proportion of migrating cells and it altered the turning behaviour without exerting a klinokinetic effect. However, colchicine had marginal orthokinetic and klinokinetic effects on fMLP-stimulated cells resulting in reduced translocation. The relationship between klinokinesis and mean angle or frequency of turns has been analysed. Klinokinesis was a substantial though not the major element of the chemokinetic response to fMLP under the conditions used. No other metazoan cells have been shown to possess such a complete pattern of responses, including orthokinesis, klinokinesis, and chemotaxis, which regulate locomotion.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cm.970050603
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  • 6
    Digitale Medien
    Digitale Medien
    Colchicine-induced stimulation of PMN motility related to cytoskeletal changes in actin, α-actinin, and myosin (1993)
    New York, NY : Wiley-Blackwell
    Cell Motility and the Cytoskeleton 25 (1993), S. 10-18 
    Details
    ISSN: 0886-1544
    Schlagwort(e): microtubules ; blebs ; locomotion ; Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: Colchicine-induced stimulation of polymorphonuclear leukocyte (PMN) locomotion is an interesting model because extension of blebs at the front occurs at a rate (about 2.4 μm/s) which is far above that reported for growth of actin filaments. The following cytoskeletal changes were observed in colchicine-treated PMNs: (1)a small increase in cytoskeleton-associated actin was noted, as well as a somewhate more pronounced increase in cytoskeleton-associated α-actinin, as compared with untreated or DMSO-treated controls. There was, however, no measurable increase in F-actin as determined by NBD-phallacidin blinding; (2)the values for the ratio (α-actinin/actin) are lower in PMNs treated with colchicine for 30 min, as compared with PMNs stimulated with fNLPNTL for 1 minute (non-polar ruffling cells) or 30 min (polarized locomoting cells); thus, this ratio may depend on the type of PMN motility; (3) in polarized PMNs F-actin was mainly located linearly all along the cell membrane; there was more intense staining at the front of the cells; (4) α-actining appeared to colocalize with F-actin at the leading front, but not with F-actin at the tail of polarized cells; (5) myosin was preferentially found at the rear part of polarized cells but not or only to a small extent at the front. Our data indicate a close functional correlation between microtubules and microfilaments. We speculate that F-actin in combination with α-actinin promotes expansion of pseudopods, whereas myosin combined with F-actin promotes contraction. In more general terms we suggest that different forms of PMN motility are generated by differential selective interaction of cytoskeletal compnents and variations in the composition of the cytoskeleton in different sites of the same cells. © 1993 Wiley-Liss, Inc.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cm.970250103
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  • 7
    Digitale Medien
    Digitale Medien
    Motility, cell shape, and locomotion of neutrophil granulocytes (1983)
    New York, NY : Wiley-Blackwell
    Cell Motility and the Cytoskeleton 3 (1983), S. 47-60 
    Details
    ISSN: 0886-1544
    Schlagwort(e): neutrophil granulocytes ; motility ; locomotion ; cell-shape ; cell-substratum adhesion ; f-Met-Leu-Phe ; Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: Activation of the motile apparatus by chemokinetic factors cannot be reliably assessed in cells that are attached to a solid substratum because motility can be totally abolished by excessive adhesion. It is however, necesary to quantify the activation of the motile apparatus in order to analyze and understand chemokinetic responses.It was the purpose of the present work to establish morphological criteria that can be used to quantify motility in nonadherent (floating) neutrophils and to predict the locomotor response under conditions of limited adhesion. The proportion of neutrophils performing crawling-like movements (polarized cells) in suspension correlates very closely with stimulated locomotion at low to optimal concentration of f-Met-Leu-Phe, ie, under conditions of limited adhesion. Reduced locomotion at supraoptimal concentrations of f-Met-Leu-Phe has also morphological correlates. The major feature is the decrease in the proportion of neutrophils performing crawling-like movements and the corresponding appearance of cells that are motile but not polarized in suspension and that do not locomote on the substratum. Concentration-dependent changes in neutrophil length and in the proportion of polarized neutrophils with and without tail were also observed. The locomotor potential of neutrophils under conditions of limited contact with the substratum can be predicted on the basis of their motile behavior, in particular the proportion of cells showing crawling-like movements, in suspension. In combination with measurements of adhesion the procedure should permit a more complete analysis of the regulation of chemokinetic responses.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cm.970030105
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  • 8
    Digitale Medien
    Digitale Medien
    RAMAN-Spektren und Struktur von Boroxol-Verbindungen (1953)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 272 (1953), S. 303-312 
    Details
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Es werden die RAMAN-Spektren von Trimethyl-, Tri-dimethylamino-, Trimethoxy-, Trichlor-boroxol und von B-Trimethylborazol mitgeteilt. Die Diskussion der spektralen Daten erbringt in Anlehnung an die gut untersuchten Spektren von 1,3,5-trisubstituierten Benzolen den sicheren Nachweis für einen ebenen Sechsring B3O3 in allen Boroxolverbindungen. Dieser liegt nach dem RAMAN-Spektrum auch im Dibortrioxyd vor.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.19532720510
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  • 9
    Digitale Medien
    Digitale Medien
    Zur Kenntnis von Ag6(SO4)(SiO4) (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 408 (1974), S. 205-208 
    Details
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: About Ag6(SO4)(SiO4)Hitherto unknown Ag6(SO4)(SiO4) has been prepared at 400-500°C under an oxygen pressure more than 1000 atm. By single crystal X-ray work the structure of tetragonal Ag6(SO4)(SiO4) has been elucidated: a = 7.060, c = 17.660 Å; D4h19-141/amd; Z = 4. The crystal structure shows a new type in which the tetrahedrally sulfat- and silicat groups are definite distinguishable. As well the both crystallographic silver positions show a different crystal-chemical character.
    Notizen: Neu dargestellt wurde Ag6(SO4)(SiO4) bei 400-500°C unter einem Sauerstoffdruck größer als 1000 atm. Nach röntgenographischen Untersuchungen der rubinroten Einkristalle kristallisiert die Verbindung tetragonal: a = 7,060, c = 17,660 Å; D4h19-141/amd; Z = 4. Die Kristallstruktur von Ag6(SO4)(SiO4) stellt einen neuen Strukturtyp dar, worin die tetraedrischen Sulfat- und Silicatgruppen deutlich unterscheidbar sind. Ebenso weisen die beiden kristallographischen Silberpositionen verschiedenartige kristallchemische Charaktere auf.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.19744080214
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  • 10
    Digitale Medien
    Digitale Medien
    Zur Kristallstruktur von Tl3PbCl5 (1977)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 432 (1977), S. 141-146 
    Details
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Crystal Structure of Tl3PbCl5Single crystals of the compound Tl3PbCl5 were prepared. Tetragonal symmetry with the lattice parameters a = 844.8 pm, c = 1 491.2 pm was shown by X-ray investigations. Tl3PbCl5 belongs to the space group P41 (No. 76). The crystal structure was solved by MULTAN and refined till R = 0.050. The metal particles are surrounded by seven chloride ions. This polyhedras are connected in a 3-dimensional way. Tl3PbCl5 shows a new structure type, without any constitutional relations to Cs3CoCl5 or (NH4)3ZnCl5.
    Notizen: Die Verbindung Tl3PbCl5 wurde in Einkristallen dargestellt und röntgenographisch untersucht. Die Kristalle zeigen tetragonale Symmetrie mit a = 844,8 pm, c = 1 491,2 pm und sind der Raumgruppe P41 (No. 76) zuzuordnen. Die Kristallstruktur wurde mit MULTAN bestimmt und bis zu einem R-Wert von 0,050 verfeinert. Die Thallium- und Bleiteilchen sind von sieben Chloridionen umgeben. Die Koordinationspolyeder sind untereinander dreidimensional verknüpft. Tl3PbCl5 kristallisiert in einem neuen Bautyp, der keinerlei strukturelle Beziehung zu Cs3CoCl5 oder (NH4)3ZnCl5 zeigt.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.19774320118
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