A RESPONSE SURFACE APPROACH FOR THE PRODUCTION OF NATURAL PIGMENT ASTAXANTHIN FROM GREEN ALGA, HAEMATOCOCCUS PLUVIALIS: EFFECT OF SODIUM ACETATE, CULTURE AGE, AND SODIUM CHLORIDE

2002 ◽  
Vol 16 (2) ◽  
pp. 107-120 ◽  
Author(s):  
R. Sarada ◽  
Sila Bhattacharya ◽  
Suvendu Bhattacharya ◽  
G. A. Ravishankar
Keyword(s):  
Sodium Chloride ◽  
Response Surface ◽  
Green Alga ◽  
Sodium Acetate ◽  
Haematococcus Pluvialis ◽  
Natural Pigment ◽  
Surface Approach ◽  
Culture Age

Construction of a growth model in the green alga Tetraselmis subcordiformis using a response surface approach

2016 ◽  
Vol 35 (3) ◽  
pp. 537-545
Author(s):  
Hui Wang ◽  
Jingyan Niu ◽  
Jiahui Liu ◽  
Hongshuai Yang ◽  
Zhigang Liu
Keyword(s):  
Response Surface ◽  
Green Alga ◽  
Growth Model ◽  
Surface Approach ◽  
Tetraselmis Subcordiformis

Pigment Composition of Haematococcus pluvialis Green Alga under the Action of Several Inducers of Astaxanthin Accumulation

2020 ◽  
Vol 36 (4) ◽  
pp. 29-33
Author(s):  
R.G. Goncharik ◽  
E.A. Kulikov ◽  
A.A. Selishcheva
Keyword(s):  
Sodium Chloride ◽  
High Intensity ◽  
Sodium Acetate ◽  
Haematococcus Pluvialis ◽  
Basic Research ◽  
Biotechnological Production ◽  
Fundamental Research ◽  
Simultaneous Decrease ◽  
Valuable Compounds ◽  
High Intensity Light

The content of astaxanthin, including its mono- and diesters, and photosynthetic pigments, has been analyzed in cells of H. pluvialis strain IBCE-H17 under the combined prolonged action of several inducers of astaxanthin accumulation. The effective induction of the astaxanthin accumulation, mainly in the form of monoesters of fatty acids, was shown after a 20-day cultivation under high-intensity light and with the addition of 1-2 g/l of sodium acetate to the culture medium. A simultaneous decrease in the content of chlorophylls and lutein in the H. pluvialis cells was observed under these conditions. The use of sodium acetate in combination with sodium chloride did not lead to noticeable changes in the content of astaxanthin compared with the use of sodium acetate alone. The obtained data can be helpful in the biotechnological production of Haematococcus biomass enriched with economically valuable compounds. astaxanthin, Haematococcus pluvialis, pigments, sodium acetate, sodium chloride, high-intensity light. This work was supported by Grant no. Б19РМ-010 of the Belarusian Republican Foundation for Fundamental Research and Grant no. 19-54-04003 of the Russian Foundation for Basic Research.

scholarly journals Enhancement of convective drying by application of airborne ultrasound – A response surface approach

2014 ◽  
Vol 21 (6) ◽  
pp. 2144-2150 ◽  
Author(s):  
Svenja M. Beck ◽  
Henry Sabarez ◽  
Volker Gaukel ◽  
Kai Knoerzer
Keyword(s):  
Response Surface ◽  
Convective Drying ◽  
Surface Approach ◽  
Airborne Ultrasound

Some Physical Properties of Kola Nuts – A Response Surface Approach

2014 ◽  
Vol 28 (2) ◽  
pp. 251-255 ◽  
Author(s):  
Rahman Akinoso ◽  
Ademola K. Aremu ◽  
Ismail S. Balogun
Keyword(s):  
Mechanical Properties ◽  
Physical Properties ◽  
Response Surface ◽  
Physical And Mechanical Properties ◽  
Young Modulus ◽  
Moisture Loss ◽  
Surface Approach ◽  
Drying Temperature ◽  
Peak Energy ◽  
Level Of Significance

Abstract This work studied the effect of drying temperature and duration on some physical and mechanical properties of two varieties of kola nuts using a response surface methodology approach. Physical properties determined were length, breadth, thickness, sphericity, aspect ratio, colour and moisture loss, while mechanical properties were force at break, yield, and peak, deformation at break and peak, energy to peak, energy to break, and yield, and Young modulus. At 5% level of significance, only mass, moisture loss, and sphericity were the physical properties affected. However, all measured mechanical properties were affected by drying temperature and duration (p<0.05).

Stepwise Response Surface Method and its Application in Reliability Analysis of Ship Hull Structure

2002 ◽  
Vol 124 (4) ◽  
pp. 226-230 ◽  
Author(s):  
Lei Yu ◽  
Purnendu K. Das ◽  
Yunlong Zheng
Keyword(s):  
Response Surface ◽  
Goodness Of Fit ◽  
Weighting Factor ◽  
Small Sample ◽  
Surface Approach ◽  
Hull Structure ◽  
One Step ◽  
Actual Contribution ◽  
Sample Set ◽  
Robust Response

A stepwise response surface approach is proposed in this paper. The response surface is determined by modified stepwise regression, so that the square and cross terms can be absorbed into the model automatically according to their actual contribution, which is calculated by repeated variance analysis. Besides, by applying a weighting factor to the statistical value of contribution and changing the thresholds of introduction and rejection, the entry of each term can be controlled in a fairly flexible manner. None other criteria than those in the traditional statistics are needed to check the goodness of fit. Considering the relatively small sample set at the beginning, the algorithm starts with a linear response surface. As the adaptive iteration proceeds, the bar to quadratic terms is lifted gradually to allow ordered entry. Since the sampling points in one step of iteration are recycled in the succeeding ones, a simple experimental design is enough to fit a robust response surface. A double bottom hull system is analyzed with randomized Young’s modulus, load distribution, and geometric properties. The sensitivity analysis is also performed with respect to the random variables and the parameters in their distributions.

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