Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 1432-072X
    Keywords: Key wordsHydrogenovibrio marinus ; Hydrogen-oxidizing bacterium ; Marine bacteria ; Obligate chemolithoautotroph ; Form I RuBisCO ; sequences ; 16S rRNA gene sequence ; Phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two form ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) genes from the obligately autotrophic, marine hydrogen oxidizer Hydrogenovibrio marinus were sequenced. The deduced amino acid sequences of both RuBisCOs revealed that they are similar to those of sulfur oxidizers (Thiobacillus) and a purple sulfur bacterium (Chromatium vinosum). According to the 16S rRNA gene sequences, H. marinus is also affiliated with these microorganisms, members of Thiomicrospira being the closest relatives. Sequence similarities of the 16S rRNA genes and of the RuBisCO genes among these γ-Proteobacteria suggest a common autotrophic ancestry. An ancestor of purple sulfur bacteria might be a common root of H. marinus and related sulfur oxidizers.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1432-1041
    Keywords: Enalapril ; Hypertension ; angiotensin converting enzyme inhibitor ; glucose tolerance ; insulin sensitivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The effect of enalapril, an angiotensin converting enzyme inhibitor, on glucose tolerance and serum insulin response to a glucose load has been evaluated in 8 non-obese patients (3 women and 5 men) with untreated essential hypertension (WHO Stage I or II) and without insulin resistance. Following a 2-month run-in control period, each patient received oral enalapril 10 mg once daily for 6 months, and an intravenous glucose tolerance test (IVGTT) was performed at the end of the run-in control and active treatment periods. Treatment with enalapril significantly lowered both the systolic and diastolic blood pressures. The response of plasma glucose to the IVGTT, glucose disappearance rate (k-value) and area under the serum insulin concentration time curve were comparable between the two phases. The results suggest that long-term treatment with enalapril has no effect on glucose tolerance in non-obese, non-insulin-resistant patients with mild-to-moderate essential hypertension.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Shock waves 10 (2000), S. 307-311 
    ISSN: 1432-2153
    Keywords: Key words: Shock tube, Stress waves, Shock waves, Stratum corneum permeability, Transdermal drug delivery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics , Technology
    Notes: Abstract. A shock tube was utilized for transdermal delivery in fuzzy rats. Rhodamine-B dextran, 10 kDa molecular weight, was used as the probe molecule. Shock waves were generated by a two-stage shock tube. A single shock wave was applied onto the skin to permeabilize the stratum corneum. Subsequently, the dextran solution diffused through the stratum corneum into the epidermis. Fluorescence microscopy of biopsies showed that the dextran was delivered to a depth of $30–60\mu m into the skin. Thus, the shock tube could become an inexpensive device for transdermal drug delivery.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 1420-9071
    Keywords: Key words. Macrophage; endothelial cell; atherosclerosis; lipoprotein metabolism; cholesterol; apoptosis; host defence; Alzheimer's disease.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. In this review, we summarize the structure and function of the scavenger receptor family of proteins including class A (type I and II macrophage scavenger receptors, MARCO), class B (CD36, scavenger receptor class BI), mucinlike (CD68/macrosialin, dSR-CI) and endothelial (LOX-1) receptors. Two motifs have been identified as ligand-binding domains a charged collagen structure of type I and II receptors, and an immunodominant domain of CD36. These structures can recognize a wide range of negatively charged macromolecules, including oxidized low-density lipoproteins, damaged or apoptotic cells, and pathogenic microorganisms. After binding, these ligands can be either internalized by endocytosis or phagocytosis, or remain at the cell surface and mediate adhesion or lipid transfer through caveolae. Under physiological conditions, scavenger receptors serve to scavenge or clean up cellular debris and other related materials, and they play a role in host defence. In pathological states, they mediate the recruitment, activation and transformation of macrophages and other cells which may be related to the development of atherosclerosis and to disorders caused by the accumulation of denatured materials, such as Alzheimer's disease.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 5
    ISSN: 1432-0649
    Keywords: PACS: 87.00; 43.25.Y
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The collapse of a single cavitation bubble near a gelatin surface, and the interaction of an air bubble attached to a gelatin surface with a shock wave, were investigated. These events permitted the study of the behavior of in vivo cavitation bubbles and the subsequent tissue damage mechanism during intraocular surgery, intracorporeal and extracorporeal shock wave lithotripsy. Results were obtained with high-speed framing photography. The cavitation bubbles near the gelatin surface did not produce significant liquid jets directed at the surface, and tended to migrate away from it. The period of the motion of a cavitation bubble near the gelatin surface was longer than that of twice the Rayleigh’s collapse time for a wide range of relative distance, L/Rmax, excepting for very small L/Rmax values (L was the stand-off distance between the gelatin surface and the laser focus position, and Rmax was the maximum bubble radius). The interaction of an air bubble with a shock wave yielded a liquid jet inside the bubble, penetrating into the gelatin surface. The liquid jet had the potential to damage the gelatin. The results predicted that cavitation-bubble-induced tissue damage was closely related to the oscillatory bubble motion, the subsequent mechanical tissue displacement, and the liquid jet penetration generated by the interaction of the remaining gas bubbles with subsequent shock waves. The characteristic bubble motion and liquid jet formation depended on the tissue’s mechanical properties, resulting in different damage mechanisms from those observed on hard materials.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  A bacterium, Azotobacter chroococcum 4A1M, isolated from a soil sample, produced an alginate-decomposing enzyme in the culture broth. The enzyme was purified to an electrophoretically homogeneous state. The purified enzyme showed maximum activity at pH 6.0 and 60° C; it was stable up to 60° C at pH 6.0 and activated by Ca2+ and inhibited strongly by Hg2+. The molecular mass of the enzyme was estimated to be 23 kDa by sodium dodecyl sulfate/polyacrylamide gel electrophoresis and 24 kDa by gel filtration. Therefore, the enzyme was considered to be monomeric. The NH2-terminal amino acid sequence was determined to be H2N-Ala-Ser-Ile-Ala-Ile-Thr-Asn-Pro-Gly-Phe. The enzyme reacted only on the polymannuronate block of alginic acid, and two main reaction products were obtained when short-chain polymannuronate was used as a substrate. The degrees of polymerization of the two products were three and two respectively.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 7
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A bacterium, Azotobacter chroococcum 4A1M, isolated from a soil sample, produced an alginate-decomposing enzyme in the culture broth. The enzyme was purified to an electrophoretically homogeneous state. The purified enzyme showed maximum activity at pH 6.0 and 60°C;it was stable up to 60°C at pH 6.0 and activated by Ca2+ and inhibited strongly by Hg2+. The molecular mass of the enzyme was estimated to be 23 kDa by sodium dodecyl sulfate/polyacrylamide gel electrophoresis and 24 kDa by gel filtration. Therefore, the enzyme was considered to be monomeric. The NH2-terminal amino acid sequence was determined to be H2N-Ala-Ser-Ile-Ala-Ile-Thr-Asn-Pro-Gly-Phe. The enzyme reacted only on the polymannuronate block of alginic acid, and two main reaction products were obtained when short-chain polymannuronate was used as a substrate. The degrees of polymerization of the two products were three and two respectively.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 1573-7357
    Keywords: 66.20.+d ; 67.50.Dg ; 67.50.Fi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of the viscosity and the slip length are reported for both the normal liquid and superfluid3He within the slip approximation. We used the hollow torsional oscillator. For the normal liquid3He the slip length is shorter than the theoretical expectation and there is no anomaly near the superfluid transition, but the viscosity shows the anomalous deviation from the Fermi liquid behavior which is thought to be attributed to the superfluid fluctuation. For the superfluid3He, the temperature dependence of the slip length agrees with the theory qualitatively and the viscosity agrees well with the theory quantitatively as far as the slip approximation is valid.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 9
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have measured the viscosity, η, and the slip length, ζ, of normal and superfluid 3 He using a torsional oscillator with a thick sample space. We coated the oscillating surface with 2.5 layers of 4 He film to study how the 4 He thin film changes the scattering mechanism of 3 He quasiparticles at the cell wall at 5 bar and 21 bar. In the normal phase, the temperature dependence of the viscosity was changed a little by the 4 He film at 21 bar but no change was observed at 5 bar. The slip length was enhanced by 4 He coating at 5 bar. This enhancement indicates the increase of specularity of 3 He quasiparticles scattering at the oscillating surface. On the other hand, a reduction of the slip length was observed at 21 bar. In the superfluid phase, the temperature dependence of ζ supports the existence of Andreev reflection even with 4 He film on the surface at 5 bar and 21 bar.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 10
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report measurements on the effects of4He coverage and pressure on the fourth sound propagation in superfluid3He in confined geometries of four different pore sizes.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...