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Now showing items 120 of 1990

Linearsystem reduction by continuedfraction expansion about a general point
(Institution of Engineering and Technology, 197407)Capacity requirements for multipleaccess demandassigned communication systems are broken down into information, demand and assignment signalling. A simultaneoustransmission scheme for demand signalling greatly reduces ... 
Linear system reduction using Schwarz canonical form
(Institution of Engineering and Technology, 197606)A system reduction method based on Schwarz canonical form has recently been observed to have certain momentmatching properties. By reformulating the method, these properties are proved and extended and the stability of ... 
Synchronization of cell division in the fission yeast schizosaccharomyces pombe by ethylenediaminetetraacetic acid
(Society for General Microbiology, 1978)When cultures of Schizosaccharomyces pombe growing exponentially in a minimal medium were treated with 50 mMEDTA for 1 h, nucleic acid synthesis was inhibited but protein synthesis was not. On transfer to fresh medium, ... 
An investigation into the potential use of chelating agents and antibiotics as synchrony inducers in the fission yeast schizosaccharomyces pombe
(Society for General Microbiology., 1979)Following the discoveries that the divalent cation ionophore A23187 and the divalent cation chelating agent EDTA can be used to synchronize yeast cell division, a study has been undertaken of the possible use of other ... 
Perturbation of enzyme activity in cells of the fission yeast schizosaccharomyces pombe subjected to continuousflow centrifugation
(Society for General Microbiology, 1980)Fluctuations in glutamine synthetase activity were observed when exponentially dividing cells of Schizosaccharomyces pombe were synchronized by continuousflow centrifugation. These fluctuations were not seen in a control ... 
Magnesium ions and the control of the cell cycle in yeast
(Company of Biologists, 1980)A study has been made of the role of magnesium ions in cell division cycle control in the fission yeast, Schizosaccharomyces pombe, and the budding yeast, Kluyveromyces fraglis. Synchronization of cell division in these ... 
Correlation of glutamine synthetase activity with cell magnesium concentration during cell division in yeast synchronized by induction
(Society for General Microbiology., 1980)Synchronization of cell division in the fission yeast Schizosaccharomyces pombe and the budding yeast Kluyveromyces fragilis was achieved by induction using the DNA synthesis inhibitor 2'deoxyadenosine and by a ... 
Changes in calcium and magnesium levels during heatshock synchronized cell division in tetrahymena
(Elsevier, 198006)Calcium and magnesium contents were measured in cells of Tetrahymena pyriformis induced to divide synchronously by a multiheatshock procedure. During freerunning synchronized cell division in complex proteose peptone ... 
Magnesiuminduced mitochondrial polymorphism and changes in respiratory metabolism in the fission yeast, schizosaccharomyces pombe
(Springer, 1982)The role of magnesium ions in controlling mitochondrial structure and function in the fission yeast, Schizosaccharomyces pombe, has been studied. Results show that in control cultures of S. pombe grown in the presence of ... 
Cell cycle specificity of certain antimicrotubular drugs in schizosaccharomyces pombe
(Society for General Microbiology, 198201)Of the seven antimicrotubular drugs tested, nocodazole, mebendazole and trifluralin at saturable concentrations failed to inhibit cell division in Schizosaccharomyces pombe, while carbendazim, thiabendazole and chloropropham ... 
Frequencydomain reduction of linear systems using Schwarz approximation
(Taylor & Francis, 1983)A frequency domain approach for reducing linear, timeinvariant systems is presented which produces stable approximations of stable systems. The method is based upon the Schwarz canonical form and is shown to have a ... 
Linear system reduction by continuedfraction expansion about s = 0 and s = a alternately
(Institution of Engineering and Technology, 198303)A method of reduction is given which uses the concept of expanding the system transfer function about the origin and about a general point. This results in good overall responses, and families of reduced models of the same ... 
Continuedfraction algorithm for biased model reduction
(Institution of Engineering and Technology, 198306)An algorithm is presented for linear system reduction which produces biased models such that combinations of retained time moments and Markov parameters may be varied. It is based on the Cauer continuedfraction expansions ... 
Factor division: a useful algorithm in model reduction
(Institution of Engineering and Technology, 198311)An alternative approach is given for linearsystem reduction by Pade approximation to allow retention of dominant modes. It avoids calculation of system time moments and the solution of Pade equations by simply dividing ... 
Efficient algorithm for reduction by continuedfraction expansion about s = 0 and s = a
(Institution of Engineering and Technology, 198311)An algorithm is given for model reduction by continuedfraction expansion about the origin and a general point. It is seen to be more efficient than the existing method and has the advantage of also generating biased models. ... 
Magnesium and the regulation of germtube formation in candida albicans
(Society for General Microbiology., 1984)Candida albicans requires Mg2+ for germtube formation. Mgdeficient media, metal ion chelators and the ionophore A23187 inhibited germtube formation. Cell Mg content during exponential yeastphase growth remained constant ... 
Comment on Homographic transformation for the simplification of continuoustime transfer functions by Pade approximation
(Taylor & Francis, 1984)It is shown that the homographic transformation method for reducing the order of linear, timeinvariant systems produces the same models as the ordinary Pad approximation method about 8 = 0, contrary to what was previously ... 
Linear system reduction by continuedfraction expansion about three points
(Institution of Engineering and Technology, 198401)The method of model reduction by continuedfraction expansion about s = 0 and s = a is extended to include the point s = Ã Â¿ also. This achieves more accurate transient approximations and thus highlights further the ... 
Comment: System reduction by Cauer continuedfraction expansion about s = a and s = α alternately
(Institution of Engineering and Technology, 198404) 
Biased model reduction by factor division
(Institution of Engineering and Technology, 198407)Model reduction by the factor division method is extended to produce biased models. A simple Routhtype algorithm avoids the necessity to calculate the retained system time moments and Markov parameters beforehand and ...