Barley straw as an inhibitor of algal growth II: laboratory studies

1990 ◽  
Vol 2 (3) ◽  
pp. 241-248 ◽  
Author(s):  
M. T. Gibson ◽  
I. M. Welch ◽  
P. R. F. Barrett ◽  
I. Ridge
Keyword(s):  
Algal Growth ◽  
Barley Straw ◽  
Laboratory Studies

Barley straw as an inhibitor of algal growth I: studies in the Chesterfield Canal

1990 ◽  
Vol 2 (3) ◽  
pp. 231-239 ◽  
Author(s):  
I. M. Welch ◽  
P. R. F. Barrett ◽  
M. T. Gibson ◽  
I. Ridge
Keyword(s):  
Algal Growth ◽  
Barley Straw

Algal growth control by a barley straw extract

2001 ◽  
Vol 77 (2) ◽  
pp. 177-181 ◽  
Author(s):  
Andrew S Ball ◽  
Matthew Williams ◽  
David Vincent ◽  
James Robinson
Keyword(s):  
Growth Control ◽  
Algal Growth ◽  
Barley Straw

Barley straw as an inhibitor of algal growth III: the role of fungal decomposition

1992 ◽  
Vol 4 (4) ◽  
pp. 353-355 ◽  
Author(s):  
J. M. Pillinger ◽  
J. A. Cooper ◽  
I. Ridges ◽  
P. R. F. Barrett
Keyword(s):  
Algal Growth ◽  
Barley Straw ◽  
Fungal Decomposition

scholarly journals Initial study of the Coix lachryma-jobi application in reducing algal growth in eutrophic lake

2020 ◽  
Vol 148 ◽  
pp. 05009
Author(s):  
Rofiq Iqbal ◽  
Teddy Tedjakusuma ◽  
Dhimas Dwinandha
Keyword(s):  
Tap Water ◽  
Chlorophyll Concentration ◽  
Treatment Plant ◽  
Algal Growth ◽  
Domestic Wastewater ◽  
Eutrophic Lake ◽  
The United States ◽  
Initial Study ◽  
Barley Straw ◽  
Physical Treatment

The usage of Hordeum vulgare or barley straw as an algistatic to control eutrophication in lake has been applied in the United States and England. Inspired by barley straw, this research studied about Coix lachryma-jobi as a substitute for barley straw in Indonesia. The aim of this research is to determine the applicability of Coix lachryma-jobi product in reducing algal growth along with its interactions with the nutrients in the water. Two stages of experiment were conducted. The first stage was applying three different products of Coix lachryma-jobi (powder, chop, and straw) in the reactors filled with water from Domestic Wastewater Treatment Plant as a representation of hypertrophic water body. Then the chlorophyll concentration was monitored to indicate algal growth. Another experiment was applying Coix lachryma-jobi in the reactor filled with tap water and water sample. The result of the experiments show that the straw of Coix lachryma-jobi without further physical treatment is the most effective to reduce algae population in the water. However, the mechanism of the algal growth has not been affected by the interactions between Coix lachryma-jobi and the nutrients.

scholarly journals Evaluating Nutrient Reduction, Grazing and Barley Straw as Measures Against Algal Growth

Wetlands ◽  
2019 ◽  
Vol 40 (1) ◽  
pp. 193-202
Author(s):  
Veronica Fervier ◽  
Pablo Urrutia-Cordero ◽  
Elena Piano ◽  
Francesca Bona ◽  
Kenneth M. Persson ◽  
...  
Keyword(s):  
Algal Growth ◽  
Barley Straw ◽  
Nutrient Reduction

Hydrogen Cyanide Polymers from the Impact of Comet P/Shoemaker-Levy 9 on Jupiter

1997 ◽  
Vol 161 ◽  
pp. 179-187
Author(s):  
Clifford N. Matthews ◽  
Rose A. Pesce-Rodriguez ◽  
Shirley A. Liebman
Keyword(s):  
Amino Acids ◽  
Solar System ◽  
Hydrogen Cyanide ◽  
Nitrogen Heterocycles ◽  
Laboratory Studies ◽  
Heterogeneous Solids ◽  
The Many ◽  
Comet Halley ◽  
The Impact ◽  
By Products

AbstractHydrogen cyanide polymers – heterogeneous solids ranging in color from yellow to orange to brown to black – may be among the organic macromolecules most readily formed within the Solar System. The non-volatile black crust of comet Halley, for example, as well as the extensive orangebrown streaks in the atmosphere of Jupiter, might consist largely of such polymers synthesized from HCN formed by photolysis of methane and ammonia, the color observed depending on the concentration of HCN involved. Laboratory studies of these ubiquitous compounds point to the presence of polyamidine structures synthesized directly from hydrogen cyanide. These would be converted by water to polypeptides which can be further hydrolyzed to α-amino acids. Black polymers and multimers with conjugated ladder structures derived from HCN could also be formed and might well be the source of the many nitrogen heterocycles, adenine included, observed after pyrolysis. The dark brown color arising from the impacts of comet P/Shoemaker-Levy 9 on Jupiter might therefore be mainly caused by the presence of HCN polymers, whether originally present, deposited by the impactor or synthesized directly from HCN. Spectroscopic detection of these predicted macromolecules and their hydrolytic and pyrolytic by-products would strengthen significantly the hypothesis that cyanide polymerization is a preferred pathway for prebiotic and extraterrestrial chemistry.

Cognitive Aging in a Precision Sport Context

1996 ◽  
Vol 1 (3) ◽  
pp. 166-179 ◽  
Author(s):  
Bo Molander ◽  
Lars Bäckman
Keyword(s):  
Older Adult ◽  
Cognitive Abilities ◽  
Cognitive Aging ◽  
Motor Performance ◽  
Intervention Programs ◽  
Laboratory Studies ◽  
High Arousal ◽  
Memory And Attention ◽  
Age Related ◽  
Principal Finding

Highly skilled miniature golf players were examined in a series of field and laboratory studies. The principal finding from these studies is that young and young adult players (range = 15-38 years) score equally well or better in competition than in training whereas older adult players (range = 46-73 years) perform worse in competitive events than under training conditions. It was also found that the impairment in motor performance on the part of the older players is associated with age-related deficits in basic cognitive abilities, such as memory and attention. These results support the hypothesis that older players may be able to compensate for age-related deficits under relaxed conditions, but not under conditions of high arousal. The possibility of improving the performance of the older players in stressful situations by means of various intervention programs is discussed.

Automation Surprise

2017 ◽  
Vol 7 (1) ◽  
pp. 28-41 ◽  
Author(s):  
Robert J. de Boer ◽  
Karel Hurts
Keyword(s):  
Flight Control ◽  
Representative Sample ◽  
Aviation Safety ◽  
Control Mode ◽  
Cognitive Errors ◽  
Laboratory Studies ◽  
Airline Pilots ◽  
Flight Operations ◽  
Widespread Phenomenon ◽  
Few Data

Abstract. Automation surprise (AS) has often been associated with aviation safety incidents. Although numerous laboratory studies have been conducted, few data are available from routine flight operations. A survey among a representative sample of 200 Dutch airline pilots was used to determine the prevalence of AS and the severity of its consequences, and to test some of the factors leading to AS. Results show that AS is a relatively widespread phenomenon that occurs three times per year per pilot on average but rarely has serious consequences. In less than 10% of the AS cases that were reviewed, an undesired aircraft state was induced. Reportable occurrences are estimated to occur only once every 1–3 years per pilot. Factors leading to a higher prevalence of AS include less flying experience, increasing complexity of the flight control mode, and flight duty periods of over 8 hr. It is concluded that AS is a manifestation of system and interface complexity rather than cognitive errors.

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