ZIB

Hits per page

hits 1 - 2 | 2 hits

Sorting

Electronic Resource

Effect of turbulence and inorganic carbon supply on growth ofDunaliella viridis Teodoresco (1995)

Jiménez, Carlos ; Mercado, Jesus ; Aguilera, José ; [et al.]

Springer

International journal of salt lake research 4 (1995), S. 223-232

add to mindlist on the mindlist

Details

ISSN: 1573-8590

Keywords: Dunaliella viridis ; subsidiary energy ; turbulence ; carbon supply ; photosynthetic efficiency

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Geography

Notes: Abstract Turbulence is known to enhance growth in microalgae. We studied the possible effects of the extra inorganic carbon supplied to the cultures when air bubbling is the source of turbulence. A set of experiments was carried out to separate the effects of the subsidiary action of agitation on growth from those due to possible carbon enrichment from air CO2 when air bubbling was the source of mixing. It was found that air bubbling does not induce an increase of the concentration of inorganic carbon in HCO 3 − -enriched growth media, and that no differences appear between air-bubbled and CO2-free air-bubbled cultures. On the other hand, photosynthetic O2 was accumulated in the medium in non-mixed cultures, which showed higher respiration and lower photosynthetic rates, probably due to photoinhibition induced by oversaturation of O2. Growth rate, maximal cell density and photosynthetic efficiency were higher in aerated cultures than in non-aerated ones.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02001492

Permalink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

Cytotoxic Triterpene Glycosides from Far-Eastern Sea Cucumbers Belonging to the Genus Cucumaria (1997)

Drozdova, Olga A. ; Avilov, Sergey A. ; Kalinin, Vladimir I. ; [et al.]

Weinheim : Wiley-Blackwell

Liebigs Annalen 1997 (1997), S. 2351-2356

add to mindlist on the mindlist

Details

ISSN: 0947-3440

Keywords: Carbohydrates ; Cucumaria japonica ; Cucumaria miniata ; Sea cucumbers ; Cucumariosides ; Triterpene glycosides ; Antitumor activity ; Chemistry ; Organic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: New cytotoxic triterpene oligoglycoside disulfates, cucumariosides A3 (1) and A6-2 (2), have been isolated from the sea cucumber Cucumaria japonica. The trisulfated cucumarioside A7-3 (4) was found to be the major component in the glycoside fraction of Cucumaria miniata. The structures were assigned on the basis of extensive spectral data (NMR and MS), selective solvolysis of desulfated derivative 3 and other chemical evidence. The presence or absence of a carbonyl group at C-16 of the aglycone and of sulfate groups at C-6 of the glucose and 3-O-methylglucose units are interpreted in terms of the functional evolution of sea cucumbers in order to improve their defensive system. Both (1) and (2) are cytotoxic in vitro at IC50 = 1 μg/ml against a selection of five human and mice tumoral cell lines.

Additional Material: 2 Ill.