| | 1 | Author
| BlahoslavM. Aršálek, Renata Rojíčková | Requires cookie* | | | Title
| Stress Factors Enhancing Production of Algal Exudates: a Potential Self-Protective Mechanism?  | | | | Abstract
| Algae are known to produce extracellular organic substances under optimum conditions and increase their production under stress. The changes in amount and composition of extra cellular carbohydrates and proteins of three green algae Scenedesmus quadricauda, Chlorella kessleri and Raphidocelis subcapitata (known as Selenastrum capricornutum) were studied after a 5-days' cultivation under the influence of different types o f stress factors (osm otic, organic, and heavy metal stressors). NaCl enhanced the quantity of carbohydrates more than proteins. A higher increase o f proteins than carbohydrates was observed after addition of 3,5-dichlorophenol, glyphosate and cadmium chloride to algal cultures. The production of dissolved organic matter differs from species to species, with the age of a culture and the type of stressor. | | | |
Reference
| Z. Naturforsch. 51c, 646 (1996); received May 28/June 25. 1996 | | | |
Published
| 1996 | | | |
Keywords
| Algae, Extracellular Products, Proteins, Carbohydrates | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_C/51/ZNC-1996-51c-0646.pdf | | | | Identifier
| ZNC-1996-51c-0646 | | | | Volume
| 51 | |
| 2 | Author
| M. Auro, Sola-Pennaa, JoseR. Oberto, M. Eyer-Fernandesb | Requires cookie* | | | Title
| Trehalose Protects Yeast Pyrophosphatase against Structural and Functional Damage Induced by Guanidinium Chloride | | | | Abstract
| Trehalose is accumulated at very high concentrations in yeasts when this organism is sub mitted to a stress condition. This report approaches the question on the protective effect of trehalose and its degradation product, glucose, against structural and functional damage promoted by guanidinium on yeast cytosolic pyrophosphatase. Here it is shown that both, 1 m trehalose or 2 m glucose, are able to attenuate at almost the same extent the conforma tional changes promoted by guanidinium chloride on the pyrophosphatase structure. On the other hand, while 1 m trehalose increases 3.8 times the K x (from 0.15 to 0.57 m) for guanidi nium chloride inhibition of pyrophosphatase activity, 2 m glucose did not even duplicate this parameter (from 0.15 to 0.25 m). These data support evidences for a functional reason for the accumulation by yeasts of trehalose, and not other compound, during stress conditions. | | | |
Reference
| Z. Naturforsch. 51c, 160—164 (1996); received September 15/November 15 1995 | | | |
Published
| 1996 | | | |
Keywords
| Trehalose, Yeast, Carbohydrate, Protection, Guanidinium Chloride | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_C/51/ZNC-1996-51c-0160.pdf | | | | Identifier
| ZNC-1996-51c-0160 | | | | Volume
| 51 | |
| 3 | Author
| WilhelmV. Dahlhoffd, Karin Radkowskia, Ingo Dierkingb, Peter Zugenmaierb | Requires cookie* | | | Title
| Amphiphilic Carbohydrate-Based Mesogens, 12 [1] High-Yield Synthesis of Mesogenic l-O-Alkanoyl-D/L-Xylitols | | | | Abstract
| The equilibrium mixture of 1,2:3,4-and l,3:2,4-di-0-ethylboranediyl-D /L-xylitols 1 and 1' obtained on reaction o f three equivalents of xylitol with two equivalents of triethylboroxin, reacts with alkanoyl chlorides (heptanoyl-dodecanoyl) to give equilibrium mixtures of the O-ethylboranediyl protected l-O-alkanoyl-D.L-xylitols 2,2' after vacuum distillation. Depro tection of the latter affords the title amphiphilic esters 3 which melt to give the smectic A liquid-crystalline phase. | | | |
Reference
| Z. Naturforsch. 51b, 1229—1234 (1996); received April 26 1996 | | | |
Published
| 1996 | | | |
Keywords
| Carbohydrates, Amphiphiles, Liquid Crystals (Smectic), 1-0-A lkanoyl-D, L-X ylitols, X-Ray | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/51/ZNB-1996-51b-1229.pdf | | | | Identifier
| ZNB-1996-51b-1229 | | | | Volume
| 51 | |
|
