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  • Articles  (23)
  • Biology  (23)
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  • Articles  (23)
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  • 1
    Electronic Resource
    Electronic Resource
    Pleiotropic consequences of mutations towards antibiotic-hypersensitivity in Serratia marcescens (1978)
    Springer
    Archives of microbiology 116 (1978), S. 259-268 
    Details
    ISSN: 1432-072X
    Keywords: Serratia marcescens ; Antibiotics, hypersensitivity to ; Membranes, bacterial ; Enzymes, extracellular ; Lipase, extracellular ; Mutation, pleiotropic ; Proteins, outer membrane ; Detergents, lysis by ; Pectin ; Glycogen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Various mutants (oxa s ) were isolated from Serratia marcescens SM-6 by selecting for hypersensitivity towards oxacillin. All mutants found are highly pleiotropic and able to yield spontaneous revertants which behave like the wild-type. Mutant W 1421 mostly studied shows the following phenotypic properties not found in the wild-type: (1) The growth is hypersensitive to various antibiotics, detergents and dyes which differ remarkably in their chemical structure and antibacterial action-mechanism, (2) the cells can be easily solubilized by 0.05% Sodium-dodecylsulfate, (3) the cells allow the adsorption of the roughmutant specific Salmonella phage 6SR, (4) strong cellular binding of crystal violet, (5) agglutination of the cells in 0.3% auramin solution and (6) reduced formation of red pigment. Strain W 1421 is assumed to be a lipopolysaccharide-defective mutant. The outer membrane of mutant W 1421 analyzed by Sodiumdodecylsulfate-polyacrylamide gel electrophoresis possesses a single protein less than that of the wild-type. Mutant W 1421 is further characterized by its low exolipase activity; exoprotease and exonuclease activities are as in the wild-type. This specific exoenzyme deficiency can be overcome either by backmutation to oxacillin-resistance or by growing mutant W 1421 in a medium supplemented with certain non-metabolizable polysaccharides, e.g. glycogen or pectin B. Both polysaccharides increase the exolipase activity of the wild-type too.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00417849
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  • 2
    Electronic Resource
    Electronic Resource
    Behaviour of Hypochlorite and of N-Chloroamines at the Dropping Mercury Electrode (1946)
    [s.l.] : Nature Publishing Group
    Nature 158 (1946), S. 706-706 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ALTHOUGH Marks and Glass1 have carried out amperometric titrations using a stationary gold electrode as the polarizable cathode, no results of investigations concerning the behaviour of hypochlorite and of N-chloroamines at the dropping mercury electrode have been recorded. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/158706a0
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  • 3
    Electronic Resource
    Electronic Resource
    Song pattern recognition and an auditory time window in the female bushcricket Ancistrura nigrovittata (Orthoptera: Phaneropteridae) (1994)
    Springer
    Journal of comparative physiology 175 (1994), S. 67-74 
    Details
    ISSN: 1432-1351
    Keywords: Orthoptera ; Tettigonioidea Acoustic communication ; Duetting ; Song models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Mate finding in the phaneropterid bushcricket Ancistrura nigrovittata is achieved by a duet, where the female replies with a short sound to the male song. In experiments with artificial song models we analysed the parameters necessary for eliciting a female response. A verse of the male song consists of a group of 5–9 syllabes which after an interval of about 400 ms is followed by a final syllable. The female response was shown to depend on two processes: (i) recognition of the syllable group as belonging to a conspecific male and (ii) perception of the final syllable as a trigger. Critical parameters for the recognition process are the duration of syllables and syllable pauses, as well as the number of syllables in a group. However, even with an optimal syllable group, the response probability still depends on the interval between the syllable group and the final syllable. The female only responds when the final syllable of the male song occurs within a 250 ms long time window begining approximately 250 ms after the end of the male's syllable group. Her reply consists of a single tick, which follows the male's final syllable with a latency of only 25 ms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00217437
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  • 4
    Electronic Resource
    Electronic Resource
    A new biophysical method to determine the gain of the acoustic trachea in bushcrickets (1994)
    Springer
    Journal of comparative physiology 175 (1994), S. 145-151 
    Details
    ISSN: 1432-1351
    Keywords: Hearing ; Pressure difference receiver ; Bushcricket
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A method is described for measuring the gain (i.e., the change of amplitude and phase angle) for sounds that propagate to the internal surface of the tympana in ears working as pressure difference receivers. The gain of the acoustic trachea has been measured in two similarly sized and closely related species of bushcrickets, in which the acoustic spiracles and tracheae differ markedly in size. The amplitude part of the gain is much larger in the species with the larger acoustic spiracle, whereas the phase part is very similar in the two species. The method is compared with other methods, which in the past have been used for estimating the gain of sound pathways inside animal bodies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00215110
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  • 5
    Electronic Resource
    Electronic Resource
    Sex-specific spectral tuning for the partner's song in the duetting bushcricket Ancistrura nigrovittata (Orthoptera: Phaneropteridae) (1994)
    Springer
    Journal of comparative physiology 175 (1994), S. 303-310 
    Details
    ISSN: 1432-1351
    Keywords: Orthoptera ; Tettigonioidea ; Song frequency ; Song recognition ; Sex difference
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The song of the male bushcricket Ancistrura nigrovittata consists of a sequence of verses. Each verse comprises a syllable group, plus, after about 400 ms a single syllable serving as a trigger for the female response song. The carrier frequency of the male song spectrum peaks at around 15 kHz, while the female song peaks at around 27 kHz. The thresholds of female responses to models of male songs are lowest for song frequencies between 12 and 16 kHz and therefore correspond to the male song spectrum. The threshold curve of the female response to the trigger syllable at different frequencies has the same shape as the tuning for the syllable group. Phonotactic thresholds of male Ancistrura nigrovittata to synthetic female responses at different frequencies are lowest between 24 and 28 kHz and thereby correspond to the female song spectrum and clearly differ from female response thresholds. Activity of the tympanic fibre bundle of both sexes is most sensitive between 15 and 35 kHz and therefore not specifically tuned to the partner's song. Individual behavioural thresholds have their minimum within 10 dB of the values of tympanic thresholds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00192989
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  • 6
    Electronic Resource
    Electronic Resource
    Telomerase activity in plant extracts (1996)
    Springer
    Molecular genetics and genomics 252 (1996), S. 342-345 
    Details
    ISSN: 1617-4623
    Keywords: Barley ; Arabidopsis thaliana ; Telo-mere ; Chromosome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Telomeres of most eucaryotes terminate in long stretches of short, guanine-rich repeats. Telomerase, a specialized enzyme with reverse transcriptase-like activity, has been shown to synthesize these repeats in many lower eucaryotes and several animal species. Although a sequence (TTTAGGG)n that matches the eucaryotic consensus sequence Tx(A)Gy is present in several plant species, the activity and expression patterns of plant telomerase have not been reported. Here we document the presence of telomerase activity in plant tissues using a modification of the human Telomeric Repeat Amplification Protocol (TRAP) assay. Telomerase activity was detected in barley embryo, anther and carpel tissues and in immature seeds ofArabidopsis thaliana, but not in barley leaf tissue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02173780
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  • 7
    Electronic Resource
    Electronic Resource
    Ultrasound-sensitive ears in a parasitoid fly (1992)
    Springer
    Naturwissenschaften 79 (1992), S. 224-226 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01227133
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  • 8
    Electronic Resource
    Electronic Resource
    Indiscriminate Response Behaviour in a Female Bushcricket: Sex Role Reversal in Selectivity of Acoustic Mate Recognition? (1997)
    Springer
    Naturwissenschaften 84 (1997), S. 252-255 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001140050391
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  • 9
    Electronic Resource
    Electronic Resource
    Mikrobielle Hydroxylierung von Progesteron in 7α-Stellung (1958)
    Springer
    Naturwissenschaften 45 (1958), S. 264-264 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643254
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  • 10
    Electronic Resource
    Electronic Resource
    Risk shift between males and females in the pair-forming behavior of bushcrickets (1992)
    Springer
    Naturwissenschaften 79 (1992), S. 89-91 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01131812
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