scholarly journals The effect of acid strength and postacidification reaction time on the determination of chlorophyll a in ethanol extracts of aquatic periphyton

2016 ◽  
Vol 14 (12) ◽  
pp. 839-852 ◽  
Author(s):  
Samuel P. Parker ◽  
William B. Bowden ◽  
Michael B. Flinn
Keyword(s):  
Reaction Time ◽  
Chlorophyll A ◽  
Acid Strength ◽  
Ethanol Extracts

Determination of cognitive impairment by reaction time measures

1995 ◽  
Vol 10 (4) ◽  
pp. 404-404
Author(s):  
S.L. Western ◽  
C.J. Long
Keyword(s):  
Cognitive Impairment ◽  
Reaction Time

Determination of the charge of Al13 Keggin oligocations intercalated into synthetic hectorite

2019 ◽  
Vol 74 (1) ◽  
pp. 85-90
Author(s):  
Marius Schöttle ◽  
Dominik Schuchardt ◽  
Andreas Edenharter ◽  
Sebastian Koch ◽  
Jürgen Senker ◽  
...  
Keyword(s):  
Reaction Time ◽  
Solid State ◽  
Ir Spectroscopy ◽  
Cation Exchange ◽  
Elemental Analysis ◽  
Crystalline Phase ◽  
Solid State Nmr ◽  
Liquid Crystalline ◽  
A Charge

AbstractApplying a nematic liquid crystalline phase of a synthetic Na-hectorite with layer separations >100 nm, the reaction time for pillaring with Al13 Keggin oligocation could be reduced to seconds ensuring that cation exchange is controlled by thermodynamics. With this material at hand we are able to resolve the long-standing dispute regarding the charge of intercalated Keggin oligocations. Micropore sizes as determined by physisorption isotherms, adsorption isotherms obtained via elemental analysis, and results of 27Al solid-state NMR and pyridine probe IR spectroscopy favor a charge of +7 for the Al13 pillars intercalated into hectorite unaltered.

scholarly journals The Identification of Fishing Ground Area with MODIS Satellite Image (Case Study: South Coast of West Java)

2018 ◽  
Author(s):  
Ketut Wikantika
Keyword(s):  
Chlorophyll A ◽  
Satellite Image ◽  
South Coast ◽  
Data Conversion ◽  
Fishing Ground ◽  
West Java ◽  
Water Region ◽  
Computation Data

According to UNCLOS, Indonesian marine territorial covers an area equal to around 2.8 million square kilometers inner archipelagic seas. Though the Indonesian water region is very wide, the resource within it is not yet been exploited optimally. Indonesia still has problems that have to be copped with, including identification of marine fishing ground areas. This report proposes a technology to make the fish-catching be more efficient and effective with the help of MODIS satellite image in term of Surface Temperature and chlorophyll-a computation. Data conversion from digital number to Water Brightness Temperature are performed. The determination of potential fishing ground area were conducted based on temperature and chlorophyll-a parameters which serve as an indicator of upwelling and observations were carried out on parameters which show this phenomenon. Based on the result, during May 2004 the upwelling process were not happened yet, and it seems to occur in June 2004. It showes by the decreasing of water temperature in South Coast of West Java particularly between the border of West Java and Central of Java. This phenomenon acts as an indicator for the raising of primer productivity and will takes about one month after upwelling to the bloom of phytoplankton.

scholarly journals PHYSIOLOGICAL AND BIOCHEMICAL CHANGES IN ALGAL CULTURES OF CHLORELLA VULGARIS AND SYNECHOCYSTIS SALINA (MESOPHILIC AND ANTARCTIC ISOLATES) OCCURING AFTER TREATMENT WITH UV-B RADIATION

2017 ◽  
pp. 73-82
Author(s):  
Dilyana Doneva ◽  
Juliana Ivanova ◽  
Lyudmila Kabaivanova
Keyword(s):  
Oxidative Stress ◽  
Chlorophyll A ◽  
Chlorella Vulgaris ◽  
Markers Of Oxidative Stress ◽  
Protective Strategies ◽  
The Antarctic ◽  
Antarctic Algae ◽  
Β Carotene ◽  
Stimulation Of

Determination of biomass production and viability of algal cells of Chlorella vulgaris and Synechocystis salina exposed to UV-B radiation were carried out in this study together with comparison of the mesophilic and antarctic isolates of both investigated strains. Estimation of the content of the pigments: chlorophyll a, chlorophyll b, β-carotene, C-phycocyanin and allo-phycocyanin in algal cells exposed to UV-B radiation was also accomplished. The obtained results showed that the antarctic algae are more resistant to oxidative stress than their mesophilic counterparts. The antarctic isolates of Ch. vulgaris and S. salina compared with the mesophilic ones - up to 72 h showed tolerance to low exposures of radiation, expressed in a slight stimulation of growth and viability of the cells. Antarctic isolates also showed greater resistance to low doses of UV-B radiation manifested by stimulation of the synthesis of chlorophyll a and β-carotene. The registered increase in the amount of C- and allo-phycocyanin in antarctic isolates of S. salina showed that they had developed protective strategies against UV-B radiation by increasing the concentration of the phycobiliproteins. As a result of increased UV-B background, in antarctic isolates, stronger antioxidant defence mechanisms are triggered, which proved the possibility of using them as markers of oxidative stress.

Research on the Preparation of Polyferric Silicate Chloride (PFSC) and Application on Algae Wastewater Treatment

2010 ◽  
Vol 154-155 ◽  
pp. 230-234 ◽  
Author(s):  
Li Ping Wang ◽  
Xiao Fei Yan ◽  
Xia Xu ◽  
Ai Bin Xu ◽  
Nai Yuan Gao
Keyword(s):  
Wastewater Treatment ◽  
Reaction Time ◽  
Chlorophyll A ◽  
Influencing Factors ◽  
Sodium Silicate ◽  
Silicic Acid ◽  
Raw Materials ◽  
Coagulation Performance ◽  
Coagulation Mechanism ◽  
Removal Efficiencies

A new polyferric silicate chloride(PFSC) was prepared by using sodium silicate, ferric chloride as raw materials, at the same time, its coagulation performance and the influencing factors were observed. The water containing algae was processed by PFSC coagulant and coagulation mechanism were discussed. The results showed that the best reaction time of PFSC preparation was 1h, temperature was 40°Cand Fe/Si mole ratio was 1. The removal efficiencies of chlorophyll a and turbidity were 82.40% and 94.97% respectively at 14mgFe•L-1 of dosage. Coagulation mechanism of PFSC is considered as the cooperation of oxidization/adsorption/charge-neutralization, adsorption-bridging and sweeping, which is the effect of silicic acid, iron and iron hydrolysate on the suspended particles in wastewater.

Turbidity Effect on the Fluorescence Determination of Chlorophyll-a in Water

2014 ◽  
Vol 522-524 ◽  
pp. 60-63 ◽  
Author(s):  
Jian Sheng Cui ◽  
Peng Yi Lv
Keyword(s):  
Particulate Matter ◽  
Chlorophyll A ◽  
Fluorimetric Determination ◽  
Water Turbidity ◽  
Fluorescence Determination ◽  
Suspended Particulate ◽  
On Line ◽  
Line Detector ◽  
Strong Scattering

The effect of turbidity on the determination of chlorophyll a by laboratory fluorometry-RF5301-Spectrofluorophotometer and online fluorescence instrumentthe On-line Detector for Seawater' chlorophyll were investigated.Using the RF5301-Spectrofluorophotometer determined the fluorescence intensity value of chlorophyll a with different turbidity,using the On-line Detector for Seawater' chlorophyll determined the chlorophyll a concentration with the different turbidity Microcystis aeruginosa samples and water samples.Analyzed the turbidity effect on fluorimetric determination results of chlorophyll a.Researches showed that when the water turbidity was large, due to the strong scattering effect of suspended particulate matter the chlorophyll a determined by fluorometry were on the high side.

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