A Consideration on an Adaptive Observer of a Linear Discrete-Time System

Kaneda, Masahiro; Shinji, Hiroshi

doi:10.9746/sicetr1965.13.112

Cited by 7 publications

(7 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Of those, the methyl isobranched PC'S'.~ have been the object of considerable study [see Lewis et al (1987) and references cited therein], but much less is known about the physical properties of methyl anteisobranched phospholipids. However, an understanding of the behavior of such lipids is of considerable interest since methyl anteisobranched fatty acids have been proposed to be the structural equivalents of unsaturated fatty acids [see Kaneda (1977) for a review]. Moreover, methyl anteisobranched fatty acids can support the growth of fatty acid auxotrophic microorganisms, thus indicating that such fatty acyl structures can support normal membrane function (Rodwell & Peterson, 1971;Silbert et al, 1973;Silvius & McElhaney, 1978).…”

mentioning

confidence: 98%

Thermotropic phase behavior of model membranes composed of phosphatidylcholines containing dl-methyl anteisobranched fatty acids. 2. An infrared spectroscopy study

Mantsch¹,

Madec²,

Lewis³

et al. 1987

Biochemistry

View full text Add to dashboard Cite

The thermotropic phase behavior of four members of the homologous series of dl-methyl anteisobranched phosphatidylcholines was investigated by Fourier transform infrared spectroscopy. The odd-numbered phosphatidylcholines exhibit spectral changes in two distinct temperature ranges, while their even-numbered counterparts exhibit spectral changes within only a single temperature range. The high-temperature transition observed in the odd-numbered phosphatidylcholines and the single thermotropic event characteristic of the phase behavior of their even-numbered counterparts are both identified as gel/liquid-crystalline phase transitions. The low-temperature event exhibited only by the odd-numbered phospholipids is identified as a gel/gel phase transition that involves changes in the packing mode of the acyl chain methylene groups, as well as changes in the conformation of the glycerol ester interface. These infrared spectroscopic data thus suggest that at low temperatures the odd-numbered methyl anteisobranched phosphatidylcholines form a highly ordered condensed phase similar to the Lc phases of the linear saturated n-acyl-phosphatidylcholines. A comparable condensed phase was not formed by the even-numbered anteisobranched phosphatidylcholines under similar conditions. The properties of the gel states of the even-numbered anteisoacylphosphatidylcholines were generally similar to those of the high-temperature gel states of their odd-numbered counterparts. Those gel states exhibit spectral characteristics indicative of hexagonally packed but relatively mobile acyl chains. The temperature-dependent changes in the spectral characteristics of these gel states were continuous and were not resolved into the discrete but overlapping transitions observed by differential scanning calorimetry.

show abstract

mentioning

confidence: 98%

Thermotropic phase behavior of model membranes composed of phosphatidylcholines containing dl-methyl anteisobranched fatty acids. 2. An infrared spectroscopy study

Mantsch¹,

Madec²,

Lewis³

et al. 1987

Biochemistry

View full text Add to dashboard Cite

show abstract

“…Predominantly most bacilli possess branched-chain fatty acids which are derived biosynthetically from precursors of the branched-chain amino acids valine, leucine, and isoleucine [2]. A group of thermoacidophilic bacilli contains as main components w-cyclohexyl fatty acids with 17 and 19 C-atoms biosynthesized via the shikimate pathway [3].…”

mentioning

confidence: 99%

Production of lipids from a thermoacidophilic bacillus strain. I. Lipids from bacillus acidocaldarius ZIMET 11274

Vier¹,

Rogge²,

Voigt³

1992

Acta Biotechnologica

View full text Add to dashboard Cite

A new isolated Bacillus strain was cultivated continuously at 68 "C and pH 3 for a long time. Extractable lipids represent about 3.6% ofcell dry weight and are made up of 18% neutral lipids, 39.3% glycolipids, and 42% acidic lipids. Main components of the fatty acid fraction are o-cyclohexylundecanoic acid and w-cyclohexyltridecanoic acid, respectively. MK-7 and hop-22(29)-ene are components of the unsaponifiable fraction. The glycolipid fraction contains the pentacyclic triterpenoid tetrahydroxybacteriohopane. Based on the thermoacidophilic growth conditions, the morphologic and physiological properties, and the nature of lipids, it can assumed that the new isolated strain belongs to the species Bacillus acidocaldariiis.Microorganisms in extreme environments contain unusual lipids which are an adaptation to the unusual environment, especially high temperature [I]. Predominantly most bacilli possess branched-chain fatty acids which are derived biosynthetically from precursors of the branched-chain amino acids valine, leucine, and isoleucine [2]. A group of thermoacidophilic bacilli contains as main components w-cyclohexyl fatty acids with 17 and 19 C-atoms biosynthesized via the shikimate pathway [3]. The occurence of o-cycloheptyl fatty acids with 18 and 20 C-atoms is described in a moderately thermoacidophilic bacillus [4].It has been demonstrated that B. acidocaldarius contains pentacyclic triterpenes [5]. The content of extended hopanoids increased strongly with increasing temperature and

show abstract

“…As the growth temperature increased, areas of peaks with shorter retention periods (1, 2, 4) decreased. On the other hand, areas of peaks which had longer retention periods (7,8) increased with the rise in temperature. The results indicate that the thermoacidophile T A-1 possesses some effective and sensitive adaptation mechanisms which alter the characteristics of membrane lipids by changing lipid composition and alkyl-chain structure.…”

Section: Resultsmentioning

confidence: 96%

The Effect of Growth Temperature on the Lipids in an Extremely Thermoacidophilic Bacterium, TA-1

Furuya¹,

Nagumo²,

Itoh³

et al. 1980

Agricultural and Biological Chemistry

View full text Add to dashboard Cite

A Consideration on an Adaptive Observer of a Linear Discrete-Time System

Cited by 7 publications

References 5 publications

Thermotropic phase behavior of model membranes composed of phosphatidylcholines containing dl-methyl anteisobranched fatty acids. 2. An infrared spectroscopy study

Thermotropic phase behavior of model membranes composed of phosphatidylcholines containing dl-methyl anteisobranched fatty acids. 2. An infrared spectroscopy study

Production of lipids from a thermoacidophilic bacillus strain. I. Lipids from bacillus acidocaldarius ZIMET 11274

The Effect of Growth Temperature on the Lipids in an Extremely Thermoacidophilic Bacterium, TA-1

Contact Info

Product

Resources

About