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  • 11
    Electronic Resource
    Electronic Resource
    Quantitative variation of “Mus musculus-like” constitutive heterochromatin and satellite DNA-sequences in the genus Mus (1980)
    Springer
    Chromosoma 81 (1980), S. 393-402 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The extent of conservation of constitutive heterochromatin in three species of Mus viz. M. musculus, M. booduga and M. dunni, with shared cytological properties and homologous DNA sequences has been studied. The cytological properties were investigated by doing fluorescence staining and condensation inhibition of their chromosomes with Hoechst 33258. Both the parameters indicate the occurrence of a reduced quantum of “M. musculus like heterochromatin” at specific sites in the other two genomes. In situ hybridization of the nick translated 3H-labelled M. musculus satellite DNA with M. booduga and M. dunni chromosomes, also corroborates our Hoechst 33258 findings and comparable variation in the amount and site of occurrence of sequences homologous to M. musculus satellite DNA in these species are noticed. The study thus provides a good example of a gradual quantitative variation of a particular type of heterochromatin and in turn of the repetitive DNA constituting it in different related species. Further since the heterochromatin in M. booduga and M. dunni is expected to contain different repetitive DNA sequences in addition to those homologous to M. musculus satellite DNA, it is proposed that a change in the balance between two or more repetitive sequences in heterochromatin may be more crucial in its evolutionary consequences rather than a mere increase or decrease of a homogeneous repetitive sequence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00368151
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  • 12
    Electronic Resource
    Electronic Resource
    Mutants of Rhizobium capable of fixing N2 in the free-living condition (1981)
    Springer
    Archives of microbiology 130 (1981), S. 147-149 
    Details
    ISSN: 1432-072X
    Keywords: Rhizobium ; Mutants ; N2-fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Six mutant strains of Rhizobium were isolated after UV treatment which could exhibit nitrogenase activity in Burk's N-free medium without any supplement. The activity ranged between 99.5 and 113 nmol/mg cell dry weight and hour. Two of the parent strains belonged to soybean, and one each to mungbean and Sesbania sp. Both the parent and mutant strains exhibited nitrogenase activity in CS 7 medium. One of the mutants retained its capacity to produce nodules on soybean roots.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00411068
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  • 13
    Electronic Resource
    Electronic Resource
    A potent converting enzyme inhibitor CGS 13928C. Drug profile in normal volunteers (1984)
    Springer
    European journal of clinical pharmacology 26 (1984), S. 419-424 
    Details
    ISSN: 1432-1041
    Keywords: converting enzyme inhibitor ; blood pressure decrease ; exogenous angiotensin ; plasma angiotensin I and II ; plasma renin ; aldosterone ; healthy male volunteers ; CGS 13928C
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The converting enzyme inhibitor CGS 13928C was evaluated in 15 healthy male volunteers. First the efficacy of a single oral dose of 0.5, 1, 2 or 5 mg in antagonizing the pressor response to exogenous angiotensin I was tested with continuous monitoring of the blood pressure and heart rate by an intraarterial catheter. CGS 13928C 1, 2 and 5 mg consistently reduced the response to angiotensin within 2 to 3 h and for a period exceeding the 4 h of monitoring. The 2 mg dose was hardly more effective than 1 mg and 5 mg did not further enhance the blockade. Subsequently, plasma renin and converting enzyme activity, angiotensin I, angiotensin II and aldosterone were measured serially before and up to 72 h following oral administration of either 1 mg (n=7) or 2 mg (n=8) CGS 13928C. As expected, plasma renin activity and angiotensin I rose, while plasma converting enzyme activity, angiotensin II and aldosterone fell following both doses of the drug. No side-effects occurred. In normal volunteers CGS 13928C is an effective and extremely potent, orally active converting enzyme inhibitor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00542134
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  • 14
    Electronic Resource
    Electronic Resource
    Cardiac arrhythmias in subarachnoid haemorrhage (1988)
    Springer
    Acta neurochirurgica 93 (1988), S. 37-44 
    Details
    ISSN: 0942-0940
    Keywords: Subarachnoid haemorrhage ; cardiac arrhythmia ; autonomic nervous system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In this prospective study 52 patients with spontaneous subarachnoid haemorrhage were examined with respect to cardiac arrhythmias and their relationship to cerebral lesions. A continuous ECG was registered over an average of five days. Sinus tachycardia was the most frequently recorded arrhythmia, followed by multifocal ventricular extrasystoles, couplets, frequent supraventricular extrasystoles, non-sustained ventricular tachycardia, asystolia and sinus arrhythmia. A significant correlation was found between the clinical manifestation of a midbrain syndrome and sinus arrhythmia, and multifocal ventricular extrasystoles. This correlation points to the autonomic cardiovascular centres as the structures involved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01409900
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  • 15
    Electronic Resource
    Electronic Resource
    Structural Characterization of Titanium Nitride Coatings on AISI M2 Steel (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 554 (Aug. 2007), p. 219-224 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this work, some surface properties of AISI M2 steel were improved by a thermoreactivedeposition process. Gas nitriding was realized on AISI M2 steel at 550°C for 2 h in anammoniac atmosphere and then, titanizing treatment performed on pre-nitrided steel in the powdermixture consisting of ferro-titanium, ammonium chloride and alumina at 1000°C for 1-4 h.Structural characterization of titanium nitride layer formed on the surface of AISI M2 steel wascarried out by using optical microscopy, scanning electron microscopy, electron microprobe and Xraydiffraction (XRD) analysis. The hardness measurements of titanium nitride layer wereconducted under 10 g loads by using Vickers microhardness indenter. Structural analysis studiesshowed that titanium nitride layers formed on the AISI M2 steel samples were smooth, compact andhomogeneous. XRD analysis show that the coating layer formed on the steel samples includes TiN,Fe6Mo7N2, C0.7N0.3Ti, C0.3N0.7Ti and V2N phases. The hardness of titanium nitride layers formed onthe steel samples is between 2040±186 and 2418±291 HV0.01. The thickness of titanium nitridelayer formed on the steel samples ranged from 3.86±0.43 9m to 6.13±0.47 9m, depending ontreatment time
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.554.219.pdf
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  • 16
    Electronic Resource
    Electronic Resource
    Characterization of Niobium Carbonitride Coating on AISI D2 Steel (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 554 (Aug. 2007), p. 213-217 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Thermo-diffusion coatings containing Nitrogen, Carbon and Niobium (N+C+Nb) onAISI D2 steel have been carried out by an initial tufftriding process followed by saturation withNiobium. The properties of the diffusion layer, namely microstructure, phase composition andmicro-hardness of the Niobium carbonitride layer, have been studied. The influence of treatmenttime of Niobizing on the thickness of the metallized layer and its phase composition has beenstudied. Nitriding treatment was performed at 575°C for 2 h. Then, the Niobizing treatment wasperformed by pack method in the powder mixture consisting of ferro-Niobium, ammonium chlorideand alumina at 1000°C for 1–4 h. The phases formed on the Niobium carbonitride coated steel wereNbN and NbC, confirmed by X-ray diffraction (XRD) analysis. The longer the treatment times, thethicker the Niobium carbonitride layer became. The thickness of Niobium carbonitride layer waschanging between 6.53 3m and 17.45 3m, depending on treatment time and temperature. Themicrohardness of Niobium carbonitride layer formed on the AISI D2 steel was changing between2132±203 and 2814±245 HV0.01 from surface to interior
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.554.213.pdf
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  • 17
    Electronic Resource
    Electronic Resource
    Interaction of surface radiation and variable property natural convection in a differentially heated square cavity - a finite element analysis (1999)
    Bradford : Emerald
    International journal of numerical methods for heat & fluid flow 9 (1999), S. 423-443 
    Details
    ISSN: 0961-5539
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A finite element solution on the interaction of surface radiation and variable property laminar natural convection is presented. Finite element formulation of the governing equations, associated with variable property natural convection, and incorporation of the radiative boundary conditions has been extensively discussed. The study also aims to highlight the limiting value of the terminal temperature difference (TTD), below which the natural convection heat transfer becomes the sole heat transfer mode, i.e. the effect of surface radiation can be neglected. The effects of variations of emissivity and TTD are also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09615539910266594
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  • 18
    Electronic Resource
    Electronic Resource
    ESR Evidence of Attenuation of Hydroxyl Radical Generation in Rat Cerebral Ischemia-Reperfusion Model by Oxypurinol (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 723 (1994), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1994.tb36761.x
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  • 19
    Electronic Resource
    Electronic Resource
    Pigment Formation by Penicillium rubrum Stoll (1963)
    [s.l.] : Nature Publishing Group
    Nature 199 (1963), S. 71-72 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Ability of a number of different nitrogenous materials, and amino-acids when individually used as the sole source of nitrogen and of various sugars and carbohydrates to produce pigment in Sabourauds medium, have been determined. The extent of pigmentation observed after 8 days is given in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/199071a0
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  • 20
    Electronic Resource
    Electronic Resource
    Thioctic Acid and Photosynthetic Fixation of Carbon Dioxide (1958)
    [s.l.] : Nature Publishing Group
    Nature 181 (1958), S. 1219-1220 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Seven-day old cultures of Chlorella pyrenoidosa and Sce ±edesmus bliquus were centrifuged down at 12 C. in an MSE centrifuge and resuspended in 10 ml. phosphate buffer of pH. 6-8. The cells were then incubated with different concentrations of thioctic acid and 30 JJLC. of sodium ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1811219a0
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