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  • Springer  (161)
  • 1980-1984  (106)
  • 1975-1979  (55)
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  • 1
    Electronic Resource
    Electronic Resource
    Kinetic-fluorimetric determination of microamounts of cerium(IV) by means of sodium 4,8-diamino-1,5-dihydroxyanthraquinone-2,6-disulphonate (1982)
    Springer
    Microchimica acta 77 (1982), S. 175-181 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Eine kinetische Methode zur Bestimmung von Spuren Cer(IV) mit Hilfe von Natrium-4,8-diamino-1,5-dihydroxyanthrachinon-2,6-disulfonat wurde beschrieben. Dabei wird ein fluoreszierendes Oxydationsprodukt gebildet, das bei 525 nm angeregt mit einer maximalen Emission bei 585 nm fluoresziert. Die Reaktion ermöglicht die Bestimmung von 0,02–0,37 ppm Cer(IV). Die vorgeschlagene Methode wird nur durch wenige Störungen eingeschränkt.
    Notes: Summary A kinetic method for determination of traces of Ce(IV), based on the oxidation of sodium 4,8-diamino-1,5-dihydroxyanthraquinone-2, 6-disulphonate is described. The reaction is monitored by means of the fluorescence of the oxidation product (λ ex=525nm,λ em=585 nm), and allows determination of 0.02–0.37 ppm Ce(IV). The proposed method has few interferences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01237805
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  • 2
    Electronic Resource
    Electronic Resource
    Activity coefficients of zinc chloride in the presence of lithium, sodium, and magnesium perchlorates, and magnesium nitrate in aqueous solution at 25°C (1982)
    Springer
    Journal of solution chemistry 11 (1982), S. 889-896 
    Details
    ISSN: 1572-8927
    Keywords: Activity coefficients ; emf ; zinc chloride ; water activity ; Pitzer's equations ; solvation cosphere structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The standard potential of the Zn−Hg (sat)/ZnCl2(M)/AgCl/Ag cell was determined at 25°C using several extrapolation procedures and the value 0.9843 V is proposed for E°. The emf of the Zn−Hg (sat)/ZnCl2(M), salt (M)/AgCl/Ag cell [salt=NaClO4, LiClO4, Mg(ClO4)2, Mg(NO3)2] have been measured at different concentrations of salt. From these data, the mean ionic activity coefficients of ZnCl2 are determined and their variations explained with the aid of Pitzer's treatment. It seems necessary to take into account structure in the ionic cospheres in order to explain the observed variations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00644752
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  • 3
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    Kinetic-fluorimetric determination of microamounts of cerium(IV) by means of sodium 4,8-diamino-1,5-dihydroxyanthraquinone-2,6-disulphonate (1982)
    Springer
    Details
    Publication Date: 1982-05-01
    Print ISSN: 0026-3672
    Electronic ISSN: 1436-5073
    Topics: Chemistry and Pharmacology
    Published by Springer
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    PAPER CURRENT
  • 4
    Electronic Resource
    Electronic Resource
    Developmental and biochemical alterations caused by tunicamycin inBufo arenarum embryos (1983)
    Springer
    Development genes and evolution 192 (1983), S. 37-41 
    Details
    ISSN: 1432-041X
    Keywords: Tunicamycin ; Exogastrulation ; Neural induction ; Cell permeability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Bufo arenarum eggs at late blastula and gastrula were treated with tunicamycin, an inhibitor of glycoprotein glycosylation, to investigate its effects on morphogenesis and neural induction. Because of the low permeability of the amphibian egg to a number of drugs, the blastocoel was opened surgically prior to treatment. Almost all of the eggs treated with the antimetabolite, at a concentration of 10 μg/ml, from late blastula stage for 24h exhibited exogastrulation. The effect is dose- and stage-dependent as shown by the lower proportion of exogastrulae obtained when eggs are treated at a lower concentration (5 μg/ml) or after the onset of gastrulation. Treatment with the antimetabolite did not interfere with neural induction, as partial exogastrulae developed a small neural tube. The most striking biochemical effect was an enhanced uptake of glucose, mannose and leucine. The incorporation of mannose into acid-insoluble material was severely inhibited by tunicamycin, with a concomitant decrease of leucine incorporation into the acid-soluble pool.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848767
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  • 5
    Electronic Resource
    Electronic Resource
    Development of imaginal discs from lethal hybrids betweenDrosophila melanogaster andDrosophila mauritiana (1983)
    Springer
    Development genes and evolution 192 (1983), S. 48-50 
    Details
    ISSN: 1432-041X
    Keywords: Drosophila ; Hybrid lethality ; Imaginal discs ; Interspecific transplantation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Females ofDrosophila melanogaster, crossed with males ofDrosophila mauritiana, produce only female offspring. The male hybrid larvae grow very slowly, fail to pupate and die after prolonged larval life. Imaginal discs from these male hybrids transplanted into Drosophila melanogaster larvae can give rise to adult structures with normal patterns. Differentiation of hybrid imaginal disc tissue is improved by short term culture in non-hybrid larvae prior to metamorphosis, suggesting that the hybrid larval haemolymph is inadequate to sustain normal imaginal disc growth. This may represent the physiological basis of the reproductive isolating mechanism separating the twoDrosophila species
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848770
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of the “sexcombless” chromosome (In(1)sx) on males and females ofDrosophila melanogaster (1982)
    Springer
    Development genes and evolution 191 (1982), S. 264-269 
    Details
    ISSN: 1432-041X
    Keywords: Drosophila ; Sexcombless ; Foreleg basitarsus ; Genital disc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The chromosome which carries the mutationsexcombless (In(1)sx) affects males and females ofD. melanogaster. In the male foreleg basitarsi the number of sexcomb teeth is dramatically reduced from 10 to 0.7 and the number of transverse rows of bristles is increased from 6 to 8. Females homozygous forIn(1)sx show a normal bristle pattern in the foreleg basitarsus. The genital disc derivatives of both male and femaleIn(1)sx flies are strongly affected. While the external genitalia show a duplicated or a reduced bristle pattern, the internal genitalia are mostly absent. However, the sexually dimorphic tergites and sternites of the abdomen remain unaffected. The male-specific effect on the basitarsus and the general effects on the genital disc derivatives are proposed to represent two different phenotypic effects ofIn(1)sx which may derive from mutations at different gene loci in the inverted chromosome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848414
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  • 7
    Electronic Resource
    Electronic Resource
    On the nestmate-recognition system and territorial marking behaviour in the antCamponotus rufipes (1984)
    Springer
    Insectes sociaux 31 (1984), S. 302-315 
    Details
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resume Les ouvrières deCamponotus rufipes (Fab.) reconnaissent comme étrangers les individus de même espèce appartenant à d'autres sociétés et les Fourmis d'autres espèces. La reconnaissance des membres de leur propre société repose sur les odeurs produites par la glande mandibulaire des ouvrières, qui sert également de phéromone d'alarme. Cette espèce marque son territoire par des substances chimiques provenant d'une glande abdominale non identifiée, qui avertissent les membres de la même espèce. Tout territoire marqué aux alentours du nid induit un recrutement ou au moins, dans le cas où il est marqué par les ouvrières d'une société étrangère, une exploration prolongée. Le même territoire, situé en dehors de la zone de nidification, entraîne la présence prolongée des ouvrières de la société qui l'a marqué. L'éventuelle relation entre la reconnaissance du nid et le comportement territorial est discutée dans un contexte évolutif, en posant l'hypothèse suivante: les phéromones d'alarme sont utilisées pour la reconnaissance des membres de leur société par ces Fourmis qui possèdent en même temps un comportement de marquage du territoire.
    Notes: Summary Camponotus rufipes (Fab.) workers recognize conspecifics from other colonies and ants from different species as aliens. Colony specific recognition is based on odours produced by the mandibular gland which also serve as alarm pheromone. This ant marks its territory with chemicals secreted by an unidentified abdominal gland, which is thus advertised to conspecifics. Marked territories near to the nest induce recruitment or at least prolonged exploration if marked by a foreign conspecific colony. The same territory outside the nest area induces a prolonged permanence of workers from the colony giving the mark. The possible relationship between nestmate recognition systems and territorial behaviour is discussed in an evolutionary context by stating the hypothesis that alarm pheromones are used for nestmate recognition by those ants possessing territorial marking behaviour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02223614
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  • 8
    Electronic Resource
    Electronic Resource
    Clonal analysis ofsex-lethal, a gene needed for female sexual development inDrosophila melanogaster (1982)
    Springer
    Development genes and evolution 191 (1982), S. 211-214 
    Details
    ISSN: 1432-041X
    Keywords: Drosophila ; Clonal analysis ; Sex determination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The mutationSxl f , located on the X-chromosome, is a sex-limited recessive lethal that specifically kills 2X; 2A flies while it does not affect X; 2A flies (Cline 1978). We have analyzed the role ofSxl f on sex determination by a clonal analysis of a new spontaneous allele,Sxl fLS . Female embryos and larvae heterozygous forSxl fLS were irradiated at different times of development to generate homozygousSxl fLS clones which were recognized by linked marker mutations. We have studied the phenotype of such clones on sexually dimorphic regions of the fly (foreleg basitarsus, 5th, 6th and 7th tergites, analia and external genitalia). Despite their female (2X; 2A) chromosomal constitution, clones homozygous forSxl fLS differentiated male structures. These results confirm and extend the preliminary report of Cline (1979). They show that the wildtype product ofSxl f is required for female development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848339
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  • 9
    Electronic Resource
    Electronic Resource
    TheUbx syndrome ofDrosophila: the prothoracic transformation (ppx) is independent ofbx, bxd andpbx (1984)
    Springer
    Development genes and evolution 193 (1984), S. 263-265 
    Details
    ISSN: 1432-041X
    Keywords: Drosophila ; Biothorax complex ; Prothoracic transformation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary If, early in development, theUbx + gene is removed by mitotic recombination from cells of the meso-and metathoracic leg primordia, theseUbx − cells develop as in the posterior prothoracic leg. We show that this transformation, termedpostprothorax, is a discrete genetic function that is independent of other homeotic transformations such asbx, pbx orbxd, which also result from the inactivation of theUbx gene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01260349
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  • 10
    Electronic Resource
    Electronic Resource
    Heterospecific combinations of germ cells and gonadal soma betweenDrosophila melanogaster, D. mauritiana andD. ananassae (1984)
    Springer
    Development genes and evolution 194 (1984), S. 99-106 
    Details
    ISSN: 1432-041X
    Keywords: Drosophila ; Pole cell transplantation ; Heterospecific combinations ; Gametogenesis ; Chorion morphology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We transplanted pole cells betweenDrosophila melanogaster, D. mauritiana andD. ananassae to investigate the ability of germ cells to develop in the gonad of a heterospecific host, and to study the interaction between somatic follicle cells and the cells of the germ line in producing the species-specific chorion. FemaleD. mauritiana germ cells in aD. melanogaster ovary produced functional eggs with normal development potential. The same is true for the reciprocal combination. FemaleD. ananassae pole cells in aD. melanogaster host only developed to a very early stage and degenerated afterwards. None of the interspecific combinations of male pole cells led to functional sperm. We could not determine at what stage the transplanted male pole cells were arrested. The cooperation of follicle cells and the oocyte-nurse cell complex in producing the chorion was studied using the germ-line-dependent mutationfs(1) K10 ofD. melanogaster, which causes fused respiratory appendages and an abnormal chorion morphology. Wild-type femaleD. mauritiana germ cells in a mutantfs(1) K10 D. melanogaster ovary led to the production of wild-type eggs withD. melanogaster-specific, short respiratory appendages. On the other hand,D. melanogaster fs(1) K10 germ cells in aD. mauritiana ovary induced the formation of eggs with mutant fused appendages which were, however, typicallyD. mauritiana in length. When.D. mauritiana pole cells developed in aD. melanogaster ovary, the chorion exhibited a new imprint pattern that differs from both species-specific patterns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848349
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