نتایج جستجو برای: chlorophyll a

تعداد نتایج: 13436215  

Journal: :F1000Research 2016
Jeffrey W Hollister Betty J Kreakie

Cyanobacteria harmful algal blooms (cHABs) are associated with a wide range of adverse health effects that stem mostly from the presence of cyanotoxins. To help protect against these impacts, several health advisory levels have been set for some toxins. In particular, one of the more common toxins, microcystin, has several advisory levels set for drinking water and recreational use. However, co...

Journal: :Applied and environmental microbiology 1997
R Sommaruga I Obernosterer G J Herndl R Psenner

We studied the effect of solar radiation on the incorporation of [(sup3)H]thymidine ([(sup3)H]TdR) and [(sup14)C]leucine ([(sup14)C]Leu) by bacterioplankton in a high mountain lake and the northern Adriatic Sea. After short-term exposure (3 to 4 h) of natural bacterial assemblages to sunlight just beneath the surface, the rates of incorporation of [(sup3)H]TdR and [(sup14)C]Leu were reduced at ...

Journal: :Chemosphere 2003
Nebahat Aydin Sawsan Daher Fazil O Gülaçar

The 13(2),17(3)-cyclopheophorbide a enol (CPP) is shown to convert mainly to a approximately 1:1 mixture of (13(2)R/S) chlorophyllones a (Chlone), when chromatographed over silica gel or alumina supports. 15(1)-hydroxychlorophyllonelactone a and some other chlorophyll a related compounds are also tentatively identified as minor transformation products of CPP. This raises the possibility that th...

2004
Anu Reinart Don Pierson

In order to complement present water quality monitoring of large lakes, we have attempted to make use of satellite imagery. In addition to ocean color sensors SeaWiFS and MODIS, lately MERIS images also became available. Here we analyze 18 almost cloud free full resolution atmospherically corrected MERIS images over the large European lakes Vättern, Vänern and Peipsi, where water type ranges fr...

2018
Claire H Davies Penelope Ajani Linda Armbrecht Natalia Atkins Mark E Baird Jason Beard Pru Bonham Michele Burford Lesley Clementson Peter Coad Christine Crawford Jocelyn Dela-Cruz Martina A Doblin Steven Edgar Ruth Eriksen Jason D Everett Miles Furnas Daniel P Harrison Christel Hassler Natasha Henschke Xavier Hoenner Tim Ingleton Ian Jameson John Keesing Sophie C Leterme M James McLaughlin Margaret Miller David Moffatt Andrew Moss Sasi Nayar Nicole L Patten Renee Patten Sarah A Pausina Roger Proctor Eric Raes Malcolm Robb Peter Rothlisberg Emily A Saeck Peter Scanes Iain M Suthers Kerrie M Swadling Samantha Talbot Peter Thompson Paul G Thomson Julian Uribe-Palomino Paul van Ruth Anya M Waite Simon Wright Anthony J Richardson

Chlorophyll a is the most commonly used indicator of phytoplankton biomass in the marine environment. It is relatively simple and cost effective to measure when compared to phytoplankton abundance and is thus routinely included in many surveys. Here we collate 173, 333 records of chlorophyll a collected since 1965 from Australian waters gathered from researchers on regular coastal monitoring su...

2010
ZhongPing Lee Shaoling Shang Chuanmin Hu Marlon Lewis Robert Arnone Yonghong Li Bertrand Lubac

[1] With a validated Quasi‐Analytical Algorithm, an 11 year (1998–2008) monthly time series of the primary optical properties of waters in the center of the South Pacific gyre was developed from Sea‐viewing Wide Field‐of‐view Sensor (SeaWiFS) and Moderate Resolution Imaging Spectroradiometer (MODIS). Also derived are chlorophyll a (Chl a) concentrations with the operational empirical algorithms...

Journal: :Applied and environmental microbiology 2016
Miriam Marquardt Anna Vader Eike I Stübner Marit Reigstad Tove M Gabrielsen

The Adventfjorden time series station (IsA) in Isfjorden, West Spitsbergen, Norway, was sampled frequently from December 2011 to December 2012. The community composition of microbial eukaryotes (size, 0.45 to 10 μm) from a depth of 25 m was determined using 454 sequencing of the 18S V4 region amplified from both DNA and RNA. The compositional changes throughout the year were assessed in relatio...

Journal: :The Journal of General Physiology 1959
B. M. Sweeney F. T. Haxo J. W. Hastings

The luminescence of the marine dinoflagellate Gonyaulax polyedra shows an endogenous diurnal rhythm. The effect of light during the phase of low luminescence capacity may be observed as an enhancement of luminescence during the subsequent bright phase. During the bright phase, however, illumination diminishes the capacity for luminescence. The action spectra for these two effects of light have ...

Journal: :Marine pollution bulletin 2003
G Arhonditsis M Eleftheriadou M Karydis G Tsirtsis

A statistical methodology is proposed for assessing the risk of eutrophication in marine coastal embayments. The procedure followed was the development of regression models relating the levels of chlorophyll a (Chl) with the concentration of the limiting nutrient--usually nitrogen--and the renewal rate of the systems. The method was applied in the Gulf of Gera, Island of Lesvos, Aegean Sea and ...

Journal: :Applied and environmental microbiology 1984
J Fabregas C Herrero M Veiga

Low hydrocarbon concentrations stimulated the growth of Tetraselmis suecica, whereas higher concentrations (200 ppm) inhibited growth. The content of chlorophyll a in this microalga was affected in a similar way. Crude oil had the most marked effects. Dispersant SEAKLIN-101-NT and mixtures of oil and SEAKLIN-101-NT did not show selective toxicity for the microalga, although inhibitory effects c...

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