The series of nine amides of substituted 8-hydroxyquinolines were prepared. The synthetic procedures of compounds are presented. All the prepared quinoline derivatives were analyzed using RP-HPLC method for the lipophilicity measurement and their lipophilicity were determined. The prepared compounds were tested for the reduction of chlorophyll content in Chlorella vulgaris Beij. Several compoun...

Herbicide-resistant mutants of the cyanobacterium Synechocystis 6714, that are altered in specific amino acids in their D-1 protein, shows differential sensitivity to formate treatment. Measurements on oxygen yield in a sequence of flashes, chlorophyll (Chl) a fluorescence transients and Chl a fluorescence yield decay after a flash reveal that the resistance of cells to formate treatment is in ...

Chloride anions, when added to DCMU [3-(3,4-dichlorophenyl)-l ,I-dimethylureal-treated spinach chloroplasts, change the rate of decay of the delayed light emission in the seconds region but do not change the shape or the temperature dependence of the decay. Benzoate anions, on the other hand, change both the rate and the shape of the decay of the delayed light emission. These results are consis...

A new biosensor was designed for the assessment of aquatic environment quality. Three microalgae were used as toxicity bioindicators: Chlorella vulgaris, Pseudokirchneriella subcapitata and Chlamydomonas reinhardtii. These microalgae were immobilized in alginate and silica hydrogels in a two step procedure. After studying the growth rate of entrapped cells, chlorophyll fluorescence was measure...

Pyrrolones, Site of Action, Structure-Activity Relations, Photosynthetic Electron Transport, Herbi­ cidal Action Substituted phenyl-hydroxy pyrrolone derivatives are potential herbicides and are found to be effective inhibitors of photosynthetic electron flow in chloroplasts. Their site of inhibition is localized at the acceptor side of photosystem II similar to DCMU. They have no effect on pho...

Substituted Benzoquinones, Photosystem II Acceptors Benzoquinones (BQ) substituted with alkyl or alkoxy groups 2,5-dimethoxy-3,6-dichloro-/>benzoquinone (DCDMQ), 2,3,5,6-tetramethoxy-/?-benzoquinone (TMQ) have been tested for their electron affinity and site of action in the photosynthetic electron transport chain in whole cells and chloroplasts. Both the substituted compounds were found to be ...

A series of 2-(l-alkylamino)vinylidene-l,3-cyclohexanedione was synthesized and assayed as inhibitors of the Hill reaction in isolated chloroplasts. The pls() value of this series was dramatical­ ly changed by modification of the peripheral of its hydrophilic moiety and the maximum p l50 value of this series was almost equal to that of DCMU. The results suggest that this series may be a good pr...

Abstract. Marine calcification is an important component of the global carbon cycle. The mechanism by which some organisms take up inorganic for production their shells or skeletons, however, remains only partly known. Although foraminifera are responsible a large part calcium carbonate production, process they concentrate debated. Some evidence suggests that seawater taken vacuolization and pa...

Abstract Extracellular carbohydrate production is widespread in sea ice microbial communities, being produced by both algae and bacteria. Under stressful conditions, including nutrient limitation high light, cells may export excess fixed carbon as glucose. Glucose microsensors were used to measure extracellular glucose exudation consumption a algal community. increased with increasing irradianc...

Farmers have increased the production of food by using chemical substances such as diuron; however, these components affect water quality and species found in ecosystems. Macrobrachium acanthurus M. olfersii postlarvae present estuary Río Jamapa, Veracruz were collected to measure LC50 LD50 herbicide Karmex (diuron: (3-(3,4-dichlorophenyl)-1,1-dimethylurea [DCMU]). The captures prawns made with...