Showing papers by "Flinders University published in 1968"
TL;DR: Cryptopleurine inhibits leucine incorporation into protein in a cell-free system from Ehrlich cells, but at 10−5M does not inhibit protein synthesis in Escherichia coli.
94 citations
TL;DR: Enzymic activity was markedly affected by the relative concentrations of AMP, ADP and ATP in assay mixtures, and the results are discussed in terms of possible mechanisms regulating the rate of adenosine kinase in vivo.
Abstract: 1. Adenosine kinase was measured in dialysed extracts from Ehrlich ascites-tumour cells by a chromatographic procedure. 2. In the absence of added Mg2+ the Km values for ATP and adenosine were 0·22mm and 2·8μm respectively. 3. The maximum velocity of adenosine kinase with free ATP was about three times that with the Mg2+–ATP complex. Free Mg2+ was a non-competitive inhibitor of the reaction. A small amount of added Mg2+, Mn2+ or Ca2+ was required for maximum adenosine kinase activity after cation bound to the enzyme had been released by treatment with p-chloromercuribenzoate and then removed by dialysis. 4. GTP, ITP, deoxy-ATP, deoxy-GTP, CTP, xanthosine triphosphate, UTP and thymidine triphosphate could partially or completely replace ATP as a phosphate donor. 5. The reaction of ATP with adenosine kinase was competitively inhibited by AMP, GMP, IMP, ADP, deoxy-ADP and IDP (Ki 0·2, 1·1, 5·9, 1·2, 0·5 and 0·78mm respectively). Enzymic activity was markedly affected by the relative concentrations of AMP, ADP and ATP in assay mixtures. 6. The results are discussed in terms of possible mechanisms regulating the rate of adenosine kinase in vivo.
49 citations
TL;DR: A study of available echo sounding data, coupled with a recent Precision Depth Recorder section along the continental margin of southern Australia, has enabled detailed plotting of submarine canyon axes as discussed by the authors, indicating at least an Early Tertiary age for initial sub-aereal cutting of heads of the large canyons.
49 citations
29 citations
TL;DR: The presence of kinetin was found to considerably increase the activity of adenine phosphoribosyltransferase in extracts of soybean callus and senescing barley leaves.
Abstract: Adenine phosphoribosyltransferase activity was measured in extracts of soybean (Glycine max var. Acme) callus and of senescing barley leaves (Hordeum distichon c.v. Prior). The enzyme from soybean callus had Michaelis constants for adenine and 5-phosphoribosyl pyrophosphate of 1.5 and 7.5 μm respectively and was inhibited by AMP and stimulated by ATP. The presence of kinetin was found to considerably increase the activity of adenine phosphoribosyltransferase in extracts of soybean callus and senescing barley leaves.
28 citations
TL;DR: No convincing evidence could be obtained to suggest that caffeine can induce sex-linked recessive lethal mutations in male Drosophila, but there is some evidence that the treatment can lower the frequency of non-disjunction, at least in males.
Abstract: Inclusion of caffeine in the food on which larvae are reared leads to increased frequencies of chromosome loss in both males and females. There is some evidence that the treatment can lower the frequency of non-disjunction, at least in males. Treatment of adults with caffeine (injection or feeding) failed to have any significant effect on chromosome loss or non-disjunction. No convincing evidence could be obtained to suggest that caffeine can induce sex-linked recessive lethal mutations in male Drosophila .
28 citations
TL;DR: In this paper, a series of compounds possessing the α-arylethyl structure were examined, including S -(+)-2-(p -tolyl)butane, S -+)-4-(p-toly l)pentanoic acid, S-+)-3-(p carboxyphenyl)butanoic acyclic acid and S -−)-2-methyl-6-( p -to l)heptane.
23 citations
TL;DR: In this paper, it was shown from ORD and CD data that equol dimethyl ether (7,4′-dimethoxyisoflavan) has the 3S-configuration instead of the R -configuration previously assigned from the plain dispersion curves at longer wavelength.
23 citations
01 Oct 1968
18 citations
TL;DR: In this article, the authors compared the early and late calculations for hydromagnetic analogues of the classical Rayleigh-Taylor problem with Hall effect and showed that an early calculation is the limiting situation of the work of Taiwar & Kaira, which confirms that the Hall effect introduces new instabilities.
Abstract: Recent calculations for hydromagnetic analogues of the classical Rayleigh– Taylor problem with Hall effect are compared. It is shown that an early calculation is the limiting situation of the work of Taiwar & Kaira, which confirms that the Hall effect introduces new instabilities.
18 citations
TL;DR: Striated pebbles constitute nearly half the pebble in a Recent mudflow deposit in the Flinders Ranges, South Australia as discussed by the authors, and the striae were probably cut during a relatively dry phase of the flow when most grains were in contact.
TL;DR: In this article, preliminary results for helicon propagation in a non-uniform resistive plasma were given for the electron cyclotron resonance, which is important even when ω ∼ Ω e 20.
TL;DR: In this paper, the authors present an analysis of crime and vagabondage in Habsburg Spain, focusing on crime incidence and distribution in different parts of the country, with the aim of re-posing an overall pattern on an age tantalizingly deficient in global figures and providing a measure of reality against which to relate the preoccupation of writers of the Golden Age with idleness and delinquency as the allpervading evils of their day.
Abstract: S PANISH arbitristas, from the middle of the sixteenth century onwards, attacked repeatedly the hordes of bandits and idle vagrants, estimated by one writer at I 50,000, whom they saw both as a parasitic drain on the nation's resources and as a symptom of an economy lacking in opportunity and hampered by unfavourable social attitudes.' Yet, in spite of the continuing belief in its relevance as a factor in the country's economic decline, with the exception of the work that has been done on bandolerismo in Catalonia,2 virtually nothing is known about crime and vagabondage in Habsburg Spain. Attention has been drawn to the subject largely on account of its connexion with the picaresque novel, while historians have interested themselves in justice rather than in delinquency. What little is known comes either from the novel or from the statute book. Yet an analysis of the incidence and distribution of crime has obvious and important implications for the more general social and economic picture. At one level, it offers the chance of reimposing an overall pattern on an age tantalizingly deficient in global figures and so permits some assessment of the relative condition of different parts of the country on the basis of a homogeneous set of data, as previous attempts exploiting figures for population, taxation, and emigration have done;3 at another, it might inject some precision into the characterization of Spain as an "otiose and vicious republic" (Gonzalez de Cellorigo), and provide a measure of reality against which to relate the preoccupation of writers of the Golden Age with idleness and delinquency as the all-pervading evils of their day.
TL;DR: In this article, a review of the relationship of attractiveness of success and repulsiveness of failure to task difficulty are reviewed and theoretical attempts to represent these relationships are noted. But some problems for future research are briefly noted, such as: ways of varying degree of perceived responsibility, effects of personality variables, degrees of perceived importance in relation to the theory of achievement motivation, asymmetries in the attribution process, determinants of degree of personal responsibility, and effects of different types of external control on subjective probability of success.
Abstract: Studies of the relationship of attractiveness of success and repulsiveness of failure to task difficulty are reviewed and theoretical attempts to represent these relationships are noted. Research following from a theory of achievement motivation is given special attention. It is argued that degree of personal responsibility for outcome is an important variable to consider. Some problems for future research are briefly noted. These involve investigation of: (1) Ways of varying degree of perceived responsibility; (2) Effects of personality variables; (3) Degree of perceived responsibility in relation to the theory of achievement motivation; (4) Asymmetries in the attribution process; (5) Determinants of degree of perceived responsibility; (6) Effects of different types of external control on subjective probability of success.
TL;DR: In this paper, heavy minerals have been separated from a series of marine sediment samples collected from the Antarctic shelf and a rough correlation was found between heavy mineral assemblages and adjacent on-shore rock types.
TL;DR: In this article, three groups of 10 university students each were tested on a cognitive task of "information reduction" at ground level, 7,000 ft or 14,000ft equivalent altitude in a decompression chamber.
Abstract: Three groups of 10 university students each were tested on a cognitive task of “information-reduction” at ground level, 7,000 ft or 14,000 ft equivalent altitude in a decompression chamber. The task involved three levels of difficulty of transformation of digits read out The Ss were tested once after 20 or 50 min exposure to the condition set and given no prior training on the task. The two more difficult tasks showed significant linear decline with attitude but the easiest task showed no change.
TL;DR: In this paper, the comments of Rodberg on the BHMM stripping analysis are analyzed in the light of a model for the process which includes core degrees of freedom explicitly, and the model supports the conclusions of BhMM.
TL;DR: The precise shape of the magnetospheric boundary is of interest for hydromagnetic studies, but these usually begin from assumptions about the nature of the magnetic field as mentioned in this paper, and any specification of the boundary which makes no reference to the field must therefore allow more flexibility in such studies.
Abstract: The interaction of the solar wind and the Earth’s magnetic field causes the field to be confined within a region shaped like a liquid drop. The solar wind flows past this region, the magnetosphere, without penetrating it. The precise shape of the magnetospheric boundary is of interest for hydromagnetic studies, but these usually begin from assumptions about the nature of the magnetic field. Any specification of the boundary which makes no reference to the field must therefore allow more flexibility in such studies.
TL;DR: In this paper, the photoneutrino process was incorporated in various evolutionary models, including the direct annihilation of electron-positron pairs, the plasma process, and the nuclear fusion process.
Abstract: A large part of the energy lost from interiors of evolving stars at temperatures greater than about 5 × 10 8 °K is carried away by neutrinos. Three neutrino-producing reactions which have been incorporated in various evolutionary models are the photoneutrino process:
direct annihilation of electron-positron pairs:
and the plasma process: