Milieu Conditions Research Articles

Yield coefficients in dependence on milieu conditions and cell states. III. Induction of synchrony in continuous yeast cell cultivation by milieu changes.

Induction of synchrony by various perturbations in continuous yeast cultivation on hydrocarbons of crude oil is described. Short-time temperature and pH-value shocks cause oscillations of budding cell percentage in the order of the cell cycle duration. An abrupt change of the phosphate ion concentration of the nutritional medium may also induce a synchronization of microbial growth. However, the frequency corresponds with the eigenfrequency of the fermentation process. The experimental values were investigated statistically using autocorrelation and spectral analysis.

Yield coefficients in dependence on milieu conditions and cell states. II. Influence of perturbations on continuous cultivation of the yeast Lodderomyces elongisporus on hydrocarbons.

The influence of perturbations on continuous yeast cell cultivations on hydrocarbons of crude oil is described. Due to such perturbations the fermentation system leaves its steady state, passes through transitional stages and reaches a new steady state. In the transitional stages a damped oscillation of biomass concentration, percentage of budding cells, oxygen consumption rate, and heat flow is observed. These results can be explained by partial synchronization of yeast cell functions in microorganism populations. In phases of partial synchronization the cell cycle of a single cell is reflected by the behaviour of the microorganism population. The adaptation of the carbon substrate feeding rate to the state of partially synchronized microorganism population makes possible lower specific substrate consumption in biomass production.

Yield coefficients in dependence on milieu conditions and cell states II. Influence of perturbations on continuous cultivation of the yeast Lodderomyces elongisporus on hydrocarbons

AbstractThe influence of perturbations on continuous yeast cell cultivations on hydrocarbons of crude oil is describedDue to such perturbations the fermentation system leaves its steady state, passes through transitional stages and reaches a new steady state. In the transitional stages a damped oscillation of biomass concentration, percentage of budding cells, oxygen consumption rate, and heat flow is observed. These results can be explained by partial synchronization of yeast cell functions in microorganism populations. In phases of partial synchronization the cell cycle of a single cell is reflected by the behaviour of the microorganism population. The adaptation of the carbon substrate feeding rate to the state of partially synchronized microorganism population makes possible lower specific substrate consumption in biomass production.

Yield coefficients in dependence on milieu conditions and cell states. I. Synchronized batch growth of a yeast

Zeitschrift für allgemeine MikrobiologieVolume 20, Issue 4 p. 283-286 Kurze Originalmitteilungen Yield coefficients in dependence on milieu conditions and cell states. I. Synchronized batch growth of a yeast T. Bley, T. Bley Institut für technische Chemie der Akademie der Wissenschaften der DDR, LeipzigSearch for more papers by this authorDr. B. Heinritz, Corresponding Author Dr. B. Heinritz Institut für technische Chemie der Akademie der Wissenschaften der DDR, LeipzigInstitut für technische Chemie der AdW DDR-7050 Leipzig, Permoserstr. 15Search for more papers by this authorA. Steudel, A. Steudel Institut für technische Chemie der Akademie der Wissenschaften der DDR, LeipzigSearch for more papers by this authorE. Stichel, E. Stichel Institut für technische Chemie der Akademie der Wissenschaften der DDR, LeipzigSearch for more papers by this authorF. Glombitza, F. Glombitza Institut für technische Chemie der Akademie der Wissenschaften der DDR, LeipzigSearch for more papers by this authorW. Babel, W. Babel Institut für technische Chemie der Akademie der Wissenschaften der DDR, LeipzigSearch for more papers by this author T. Bley, T. Bley Institut für technische Chemie der Akademie der Wissenschaften der DDR, LeipzigSearch for more papers by this authorDr. B. Heinritz, Corresponding Author Dr. B. Heinritz Institut für technische Chemie der Akademie der Wissenschaften der DDR, LeipzigInstitut für technische Chemie der AdW DDR-7050 Leipzig, Permoserstr. 15Search for more papers by this authorA. Steudel, A. Steudel Institut für technische Chemie der Akademie der Wissenschaften der DDR, LeipzigSearch for more papers by this authorE. Stichel, E. Stichel Institut für technische Chemie der Akademie der Wissenschaften der DDR, LeipzigSearch for more papers by this authorF. Glombitza, F. Glombitza Institut für technische Chemie der Akademie der Wissenschaften der DDR, LeipzigSearch for more papers by this authorW. Babel, W. Babel Institut für technische Chemie der Akademie der Wissenschaften der DDR, LeipzigSearch for more papers by this author First published: 1980 https://doi.org/10.1002/jobm.19800200407Citations: 6AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Citing Literature Volume20, Issue41980Pages 283-286 RelatedInformation

Yield coefficients in dependence on milieu conditions and cell states. I. Synchronized batch growth of a yeast.

Zeitschrift für allgemeine MikrobiologieVolume 20, Issue 4 p. 283-286 Kurze Originalmitteilungen Yield coefficients in dependence on milieu conditions and cell states. I. Synchronized batch growth of a yeast T. Bley, T. Bley Institut für technische Chemie der Akademie der Wissenschaften der DDR, LeipzigSearch for more papers by this authorDr. B. Heinritz, Corresponding Author Dr. B. Heinritz Institut für technische Chemie der Akademie der Wissenschaften der DDR, LeipzigInstitut für technische Chemie der AdW DDR-7050 Leipzig, Permoserstr. 15Search for more papers by this authorA. Steudel, A. Steudel Institut für technische Chemie der Akademie der Wissenschaften der DDR, LeipzigSearch for more papers by this authorE. Stichel, E. Stichel Institut für technische Chemie der Akademie der Wissenschaften der DDR, LeipzigSearch for more papers by this authorF. Glombitza, F. Glombitza Institut für technische Chemie der Akademie der Wissenschaften der DDR, LeipzigSearch for more papers by this authorW. Babel, W. Babel Institut für technische Chemie der Akademie der Wissenschaften der DDR, LeipzigSearch for more papers by this author T. Bley, T. Bley Institut für technische Chemie der Akademie der Wissenschaften der DDR, LeipzigSearch for more papers by this authorDr. B. Heinritz, Corresponding Author Dr. B. Heinritz Institut für technische Chemie der Akademie der Wissenschaften der DDR, LeipzigInstitut für technische Chemie der AdW DDR-7050 Leipzig, Permoserstr. 15Search for more papers by this authorA. Steudel, A. Steudel Institut für technische Chemie der Akademie der Wissenschaften der DDR, LeipzigSearch for more papers by this authorE. Stichel, E. Stichel Institut für technische Chemie der Akademie der Wissenschaften der DDR, LeipzigSearch for more papers by this authorF. Glombitza, F. Glombitza Institut für technische Chemie der Akademie der Wissenschaften der DDR, LeipzigSearch for more papers by this authorW. Babel, W. Babel Institut für technische Chemie der Akademie der Wissenschaften der DDR, LeipzigSearch for more papers by this author First published: 1980 https://doi.org/10.1002/jobm.19800200407Citations: 6AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Citing Literature Volume20, Issue41980Pages 283-286 RelatedInformation

Histopathological reactivity of carotid arteries of normotensive Sprague-Dawley vs spontaneously hypertensive rats to ligation injury.

The common carotid arteries of normotensive non-arteriosclerotic Sprague-Dawley (S-D) rats, mildly hypertensive but arteriosclerotic breeder S-D rats, severely hypertensive but non-arteriosclerotic virgin spontaneously hypertensive rats (SHR), and severely hypertensive breeder SHR were ligated to induce injury. Three weeks post-ligation, the animals were killed and histopathological sections of the ligated artery demonstrated myointimal proliferation without occlusion in the normotensive S-D rats but myointimal proliferation with occlusion in the severely hypertensive SHR. Breeder S-D rats with moderate hypertension manifested a high incidence of total occlusion by combined myointimal proliferation and thrombosis. Severely hypertensive breeder SHR manifested a high incidence of massive thrombi containing cholesterol clefts causing total occlusion of the injured artery. It is suggested that the severity of the hypertension and the hormonal-metabolic milieu conditions the morphologic response of the arterial wall to injury.

Effects on labile metabolites of temporal delay in freezing biopsy samples of dog myocardium in liquid nitrogen.

Sudden hypothermia utilising liquid nitrogen has been used for immediate inhibition of metabolic reactions and preservation of labile compounds in heart muscle. It has been suggested that this rapid transfer of tissue into liquid nitrogen, within 1 to 2 s, is essential for accurate assessment of internal milieu conditions. We tested this hypothesis in normal dogs by measuring phosphocreatin, ATP, glycogen, and lactate concentrations in transmural layers of a core biopsy taken from the posterolateral wall of the left ventricle frozen immediately in liquid nitrogen or held at room temperature for varying times up to 300 s before freezing the tissue. The earliest significant change occurred in phosphocreatine levels after 60 s; only phosphocreatine demonstrated any changes within the first 120 s. These studies indicate that a delay of up to 30 s may be tolerated before freezing tissue without any change occurring in these labile metabolites.

Der Wasser- und Photosynthesehaushalt von Wüstenpflanzen der südalgerischen Saharal ) : I. Standorte und Versuchspflanzen

In three parts we communicate the results of ecophysiological field investigations in the North Saharian desert around Beni Ounif, on the foot of the Sahara-Atlas. In the present first part, after a general discussion of the climatic and edaphic milieu conditions (fig. 2, 3, 4) and of the geographic and sociologic position of the vegetation, the experimental habitats and plants are characterized in particular (table 1, 2). The following species of perennial constitutional types were examined: Malacophyllous shrubs ( Ziziphus lotus, Rhus tripartita, Capparis spinosa ); nanophyllous shrubs ( Thymelaea microphylla, Tamarix gallica ); switch·shoot shrubs ( Retama retam, Ephedra alata, Zilla macroptera, Launaea arborescens, Pituranthos scoparius, Rhantherium adpressum, Randonia africana, Coronilla juncea ); switchshoot hemicryptophytes ( Juncus maritimus ); malacophyllous hemicryptophytes and geophytes ( Peganum harmala, Citrullus colocynthis, Phragmites australis ); sclerophyllous cushion hemicryptophytes (Anabasis aretioides); sclerophyllous hemicryptophytes ( Echinops spinosus, Centaurea pungens ); succulents ( Limoniastrum feei, Zygophyllum album, Frankenia thymoides ). The geographical areas demonstrate the holarctic origin of the vegetation, in which trees are absent and switchs-hoot shrubs prominent. The different con-stitution types are characterized by the dimension quotient and the anatomy of the leaves and by the structure of the root system (table 2, fig. 5-22).

Interactions between Plants and Epiphytic Bacteria Regarding Their Auxin Metabolism

AbstractUsing hydrocultured pea plants, 109 bacterial strains (42 from shoots) were isolated from shoots, roots, and from the hydroculture medium. 58 different strains (26 from shoots) were able to produce IAA from tryptophan, 15 different strains (7 from shoots) were able lo destroy IAA. (Included are 13 strains possessing both properties.) As far as they could be identified, the IAA‐producing and ‐destroying strains belong to Pseudomonas (by far dominating), Achromobacter, Alcaligenses, Bacillus, and Flavobacterium. The IAA‐destroying activity strongly depends on the physiological state of the bacteria and the milieu conditions. Bacterial IAA production (but not IAA‐degradation) is supposed to be important for the plant.