ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

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

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Critical algebras and the Frattini congruence (1995)
    Springer
    Algebra universalis 34 (1995), S. 336-344 
    Details
    ISSN: 1420-8911
    Keywords: Critical algebra ; congruence-permutable variety
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this note we show that if two critical algebras generate the same congruence-permutable variety, then the varieties generated by their proper sections also coincide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01182090
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Connections between congruence-lattices and polynomial properties (1983)
    Springer
    Algebra universalis 17 (1983), S. 227-262 
    Details
    ISSN: 1420-8911
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract This paper gives characterisations of properties of varieties such as congruence-distributivity (CD), filtrality (FI), CD and having complemented principal congruences — these last two properties are shown to be equivalent- and having restricted equationally definable principal congruences (REDPC), in terms of the existence of some kind of polynomials. These are generalisations both of Jónsson's famous theorem characterizing CD as well as results concerning the (dual) discriminator. The methods are applied to show that REDPC implies CD, which was a problem asked in [2]. A generalisation of the concept of the Mal'cev condition — the so called Pixley-condition — is defined, and it is shown that filtrality and REDPC are Pixley-conditions. The relations between several concepts connected with the above ones are also investigated. The definitions can be found in section 2, and the results are contained in section 4, section 5, and section 6. We call attention to the figure at the end of the paper, which contains most of our results and gives a survey of the concepts examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01194534
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Upper mantle source for some hawaiites, mugearites and benmoreites (1974)
    Springer
    Contributions to mineralogy and petrology 48 (1974), S. 33-43 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Chemical analyses of over seventy lavas or dykes containing spinel lherzolite inclusions of high pressure mineralogy, show that most host magmas are of alkali olivine basalt or basanite composition with relatively rare olivine nephelinites, and olivine melilitites. The 100 Mg/Mg+Fe++ ratios of host magmas display a strong maximum at about Mg70 consistent with partial melting of source peridotite with olivine of Fo88–90. In contrast to these primary magmas, there occur some host magmas with 100 Mg/Mg+Fe++〈60 and with chemical compositions resembling those of classical hawaiite, mugearite, and nepheline benmoreite magmas. It is inferred that these magmas have been produced by crystal fractionation, within the upper mantle, of parental basanites or alkali olivine basalts. The presence of kaersutitic hornblende xenocrysts accompanying the lherzolite inclusions, and the nature of the chemical variation between associated basanites and nepheline benmoreites suggests that crystal fractionation has been dominated by kaersutitic hornblende, together with olivine and, in some cases, probably clinopyroxene. The mantle-derived nepheline benmoreite magmas also show similarities to some plutonic nepheline syenites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00399108
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Callus initiation and plant regeneration from inflorescence primordia of the intergeneric hybrid Agropyron repens (L.) Beauv.xBromus inermis Leyss. cv. nanus on a modified nutritive medium (1992)
    Springer
    Plant cell reports 11 (1992), S. 266-269 
    Details
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Plant regeneration from callus of intergeneric hybrid Agropyron repens (L.) Beauv. x Bromus inermis Leyss cv. nanus (AGROMUS) was carried out on a new culture medium designated medium-F. Within 21 days of the plating of inflorescence primordia the initiated callus showed globular structures. From the 21st day of culture, one step plant regeneration occurred on the callus without subculture. The new basal medium reported in this work was effective in callus initiation and plant regeneration of the hybrid AGROMUS by (i) the reduction of the total ion strength (2.6 g/l, 22.5 mM) of macroelements compared to MS (4.5 g/l,45.2 mM), (ii) the use of NH4NO3 as the sole N-source, and (iii) the application of KH2PO4 at an 8 times higher concentration (1160 mg/l,8.5 mM) when compared to the Murashige and Skoog medium composition. This medium provided a 2 to 10 fold reduction in the 2,4-dichlorophenoxyacetic acid supplement needed for the callus initiation and one step plant regeneration after a gibberellic acid (2 mg/l, for 5 days) pretreatment of tillers. The regenerated plantlets were subcultured in multi-shoot culture and potted in soil to grow for further analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00235079
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Changes in Land Cover and Subsequent Effects on Lower Fraser Basin Ecosystems from 1827 to 1990 (1997)
    Springer
    Environmental management 21 (1997), S. 185 -196 
    Details
    ISSN: 1432-1009
    Keywords: KEY WORDS: Human impact; Land cover; Net primary productivity; Organic carbon in soil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002679900017
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Production of phosphinothricin-tolerant rice (Oryza sativa L.) through the application of phosphinothricin as growth regulator (2000)
    Springer
    Plant cell reports 19 (2000), S. 1226-1231 
    Details
    ISSN: 1432-203X
    Keywords: Keywords Rice ; Herbicide resistance ; In vitro selection ; Phosphinothricin ; Glutamine synthetase ; Abbreviationsbar: Bialaphos resistance gene ; GA3: Gibberellic acid ; GM: Germination medium (Toldi et al. 1994) ; GS: Glutamin synthetase ; MS: Murashige and Skoog (1962) medium ; N6: Chu (1978) medium ; PAT: Phosphinothricin acetyltransferase ; PPT: l-Phosphinothricin ; R0 plants: In vitro regenerated plants originating from tissue culture ; R1 plants: Progeny of R0 plants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  A novel procedure has been developed to produce rice (Oryza sativa L.) tolerant to the herbicide phosphinothricin (PPT) by means of in vitro selection. First, sublethal and lethal concentrations of PPT on 7-day-old seedlings were determined and morphogenetic events in response to the PPT treatment evaluated. Differentiation of 6–30 microshoots on 5–40% of the treated plant material was observed on a hormone-free culture medium supplemented with a sublethal concentration of PPT. We proved that PPT is morphogenetically active, similar to the action of many other herbicides, showing cytokinin-like effects in rice tissue culture. Fertile plants were grown from those microshoots having PPT tolerance under greenhouse conditions. To the best of our knowledge, this is the first report on the production of rice plants tolerant to this herbicide without genetic transformation. Since PPT is a competitive inhibitor of glutamine synthetase (GS), total GS activity in PPT-tolerant and PPT-sensitive plants was examined comprehensively in order to decide whether this enzyme has any role in PPT tolerance. An elevated GS activity was detected in PPT-tolerant plant material which could result in an elevated PPT tolerance at unchanged concentrations of the herbicide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002990000276
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Increase of green plant regeneration efficiency by callus selection in Puccinellia limosa (Schur.) Holmbg. (1989)
    Springer
    Plant cell reports 8 (1989), S. 174-177 
    Details
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Three main types of callus have been selected from seeds of salt marsh grass(Puccinellia limosa (Schur.) Holmbg.) subcultured on Murashige and Skoog medium supplemented with 2,4-dichlorophenoxyacetic acid and kinetin. Callus type I differentiated only occasionally. Callus type II produced roots but no shoots under all tested culture conditions. Both green (47 %) and albino plants have been obtained from the embryogenic callus type III. Callus type III was divided into two subtypes (greening and non-greening) according to the presence or absence of green spots. Separated greening embryogenic callus gave up to 87 % green plants, whereas non-greening callus produced only 4 %.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00716834
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    On the congruence extension property (1977)
    Springer
    Semigroup forum 15 (1977), S. 183-184 
    Details
    ISSN: 1432-2137
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02195749
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Dynamics of oil/water displacement in capillary tubes with periodically varying diameter (1982)
    Springer
    Colloid & polymer science 260 (1982), S. 808-810 
    Details
    ISSN: 1435-1536
    Keywords: Dynamic contact angle ; immiscible liquid/liquid displacement ; tertiary oil recovery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In order to simulate microscopic processes that may occur during tertiary oil recovery, capillary tubes of glass, polyethylene and polyurethane withperiodically varying cross-section were prepared, and the displacement of highern-alkanes by aqueous solutions of sodium-dodecylsulfate was studied by means of microphotography. Investigated was the influence of the surfactant concentration, the flow velocity and the viscosity ratio of the two fluids on the dynamic contact angle and the distribution of the “oil” in the pores. It was found that both the extent of the hydrodynamically trapped oil and the way it occurs depends on the local geometry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01452074
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Surface grafting of polyethyleneoxide optimized by means of ESCA (1987)
    Springer
    Colloid & polymer science 74 (1987), S. 113-119 
    Details
    ISSN: 1435-1536
    Keywords: PEO surface grafting ; ESCA characterization ; polyethyleneoxide surface ; aldehyde-amine coupling ; minimal protein adsorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A hydrophilic, non-ionic surface was prepared by grafting polyethyleneoxide (PEO) onto polyethylene (PE) and mica substrates. Monofunctional PEO-aldehyde was coupled by means of reductive amination to primary and secondary amino groups of polyethyleneimine (PEI) adsorbed on oxidized polyethylene (PE) and on mica. Optimum values of the reaction parameters influencing the reductive amination in this heterogeneous system were sought in order to achieve complete coverage of the surface by covalently linked PEO chains. Carrying out the coupling reaction at 60 °C, pH 6 and ck 2 so 4 over 40 h resulted in a PEO surface characterized by a maximal ESCA — C-O-/-CH2-ratio and, simultaneously, complete wetting by water. A PEO surface with a high degree of coverage was also obtained by means of adsorption from solution of a PEO-amine compound on mica.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01191021
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...