scholarly journals ANALYSIS OF CAUSING FACTORS ON THE APPEARANCE OF HABS IN COASTAL WATER OF MAKASSAR

2019 ◽  
Vol 4 (2) ◽  
Author(s):  
Rahmadi Tambaru ◽  
Yayu A. La Nafie La Nafie ◽  
Astrid W. Junaidi
Keyword(s):  
Coastal Water ◽  
Coastal Waters ◽  
Experimental Methods ◽  
Optimal Conditions ◽  
Influence Of Temperature ◽  
Chemical Factors ◽  
Physical And Chemical ◽  
The Relationship

HABs were types of phytoplankton considered dangerous in the sea. Its appearance was triggered by an increase in nutrients and the presence of physical and chemical factors in the optimal conditions to support its growth. For that reason, research on the analysis of the causes of the emergence of HABs in the coastal waters of Makassar has been carried out. The implementation is carried out from March to June 2017 using non-experimental methods. The results showed that there were seven types of HABs, such as Protoperidinium, Gymnodinium, Ceratium, Prorocentrum, Gyrodinium, Gonyaulax, and Dinophysis. That types from the Dinophyceae Class. The appearance of the types of HABs was due to the influence of temperature with the relationship were very strong and positive.

scholarly journals ALGAS MARINAS BENTICAS INDICADORAS DE UN AREA AFECTADA POR AGUAS DE SURGENCIA FRENTE A LA COSTA CARIBE DE COLOMBIA

2016 ◽  
Vol 9 ◽  
Author(s):  
Germán Bula Meyer
Keyword(s):  
Coastal Upwelling ◽  
Climatic Factors ◽  
Biological Indicators ◽  
Sea Bottom ◽  
Chemical Factors ◽  
The Caribbean ◽  
Relationship Of ◽  
Physical And Chemical ◽  
Counter Current ◽  
The Relationship

The present paper is the result of a study undertaken to establish the relationship of certain marine envlromental factors and the benthic flora of the Caribbean littoral of Colombia. For the purpose of this study this coastal bands has been divided in two Areas. Area 1 is found between Cabo Tiburón and the mouth of the Río Magdalena, and is characterized by warm waters with very small fluctuations of the surface temperature. Area 2 ranges from the mouth of the Río Magdalena to Castilletes, and its waters are affected by a coastal upwelling with a locality of maximum intensity at the West of Península de Guajira. As a result of the presence of this upwelling there are considerable variations in the physical and chemical factors acting upon the benthic flora, there established for very short periods or all year round, as well as determining the absence of some genera and species typical of these latitudes. The parameters used for detecting this oceanographic phenomenon are given by Díaz-Piferrer (1967 a) for Venezuela. To the biological indicators cited by this author for Venezuela, the present writer adds the brown alga Ectocarpus confervoides (Roth) Le Jolis, which was found in the area of upwelling in Colombia. A comparative study of these indicators plants with those of Venezuela is given in the present paper. Similarities and differences were found to be caused by the over-run of the warm counter current on the Colombian upwelling; by the different forces of the Caribbean Current and Guayana Current, all of which lead to the related oceanographic phenomenon; tfie climatic factors; the topography of the sea bottom and the influence of the continental waters over these upwelling.

scholarly journals Fish Community Structure in Air Remuding River, Riau Silip, Bangka Regency

2020 ◽  
Vol 14 (1) ◽  
pp. 49-58
Author(s):  
Hodri Msp Ubb
Keyword(s):  
Community Structure ◽  
Fish Community ◽  
Diversity Index ◽  
Fish Community Structure ◽  
Dominance Index ◽  
High Uniformity ◽  
Chemical Factors ◽  
Physical And Chemical ◽  
The Relationship ◽  
River Fish

Air Remuding River is  a river which located in Pangkal Niur Lama Hamlet, Riau Silip District, Bangka Regency. Air Remuding River is ± 1 km from Pangkal Niur Lama Hamlet. This study aims to analyze the structure of the fish community in the Air Remuding River and to analyze the relationship between the physical and chemical factors of the waters to the species composition of the fish in the Air Remuding River. This research  conducted in the month of January 2020 in the waters of the Air Remuding River, Pangkal Niur Lama Hamlet, Riau Silip District, Bangka Belitung Islands Province. The results of this study indicate that the most common fish caught in the Air Remuding river we're 2501 fishes (Rasbora bankanensis). Diversity Index (H '), Air Remuding River fish with a range of 0.66-0.72. included in the criteria of moderate diversity, while the Uniformity Index (E), Air Remuding River fish were high uniformity and the Dominance Index ranged from 0.19 to 0.23. The composition of fish species in the Air Remuding River correlates with DO, depth, current velocity and nitrate.

Statistical Analysis of the Factors Effect on the Zinc Coating Thickness

2013 ◽  
Vol 378 ◽  
pp. 184-189 ◽  
Author(s):  
Alena Vagaská ◽  
Miroslav Gombár ◽  
Ján Kmec ◽  
Peter Michal
Keyword(s):  
Statistical Analysis ◽  
Zinc Coating ◽  
Constant Current ◽  
Electrolyte Temperature ◽  
Constant Current Density ◽  
Zinc Plating ◽  
Chemical Factors ◽  
Relationship Of ◽  
Physical And Chemical ◽  
The Relationship

In order to improve the corrosion resistance of the material EN 355 the thickness of the zinc coating, deposited during the acid zinc plating process at a constant current density 1 A·dm-2, was monitored. The thickness of deposited coating has been investigated as the relationship of physical and chemical factors acting during the galvanic zinc plating, i.e. the electrolyte temperature, electrolyte composition (the amount of zinc, the amount of chloride and boric acid in the electrolyte), the plating time and the size of the voltage. Based on the mathematical-statistical analysis of the obtained data the suitable predicting model was developed for determining the thickness of deposited zinc coating reflecting the technological conditions of the acid zinc plating process.

scholarly journals Mat thickness associated with Didymosphenia geminata and Cymbella sp. in the southern rivers of Chile

2018 ◽  
Author(s):  
Daniel Zamorano ◽  
Diana J Lillo ◽  
Jorge Parodi ◽  
Matias Peredo-Parada ◽  
Carolina A Díaz
Keyword(s):  
Aquatic Systems ◽  
International Literature ◽  
Southern Chile ◽  
Didymosphenia Geminata ◽  
Two Samples ◽  
Chemical Factors ◽  
Mat Thickness ◽  
Physical And Chemical ◽  
The Relationship ◽  
Main Producer

Didymosphenia geminata is a diatom that can alter aquatic systems. According to the international literature, chemical and hydraulic factors have a greater influence on the proliferation of D. geminata, but the study of other microalgae that could be associated with it has been poorly addressed. The objective of this study is to evaluate the relationship between the structure of mat thickness D. geminata and another taxon that produces mucilage, Cymbella sp., while also considering physical and chemical factors. To do this, two samples were taken, one in the spring of 2013 and the other in the autumn of 2014, from eight rivers in central-southern Chile-South America, where the benthic community was characterized and the thickness of the mat was measured. The results indicate that in the presence of both taxa the thickness of the mat layer is doubled. However, antecedents suggest that D. geminata is the main producer of mucilage, being seconded by Cymbella sp. The present study contributes evidence about the relationship between mat thickness D. geminata and other microalgae contribution, and aquatic condition for this development.

scholarly journals Mat thickness associated with Didymosphenia geminata and Cymbella spp. in the southern rivers of Chile

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e6481
Author(s):  
Daniel Zamorano ◽  
Matías Peredo-Parada ◽  
Diana J. Lillo ◽  
Jorge Parodi ◽  
Carolina A. Díaz
Keyword(s):  
Great Influence ◽  
Intermediate Cell ◽  
Didymosphenia Geminata ◽  
Physicochemical Variables ◽  
Two Samples ◽  
Chemical Factors ◽  
Cell Densities ◽  
Mat Thickness ◽  
Physical And Chemical ◽  
The Relationship

Didymosphenia geminata is a diatom that can alter aquatic systems. Several investigations have shown as chemical, and hydraulic factors have a great influence on the proliferation of D. geminata, but the study of other microalgae that could be associated with it has been poorly addressed. The objective of this study is to evaluate the relationship between mat thickness, D. geminata and another taxon that produces mucilage, Cymbella, while also considering physical and chemical factors. For this, two samples were taken, one in the spring of 2013 and the other in the autumn of 2014, from eight rivers in central-southern Chile-South America, where the benthic community was characterized, and the thickness of the mat was measured. The results show that the mat thickness on sites with the presence of both taxa is doubled, and while sites with D. geminata presence showed mat peak on autumn, sites with Cymbella spp. presence showed on spring. Also, higher values of mat thickness associated with low cell densities of D. geminata and intermediate cell densities of Cymbella spp. Finally, physicochemical variables that better explain mat thickness are phosphorus and water temperature. An alternation process of mucilage production may explain these results by these taxa strongly related to physicochemical variables. The present study contributes evidence about the relationship between mat thickness D. geminata and other microalgae contribution, and aquatic condition for this development.

scholarly journals Mat thickness associated with Didymosphenia geminata and Cymbella sp. in the southern rivers of Chile

2018 ◽  
Author(s):  
Daniel Zamorano ◽  
Diana J Lillo ◽  
Jorge Parodi ◽  
Matias Peredo-Parada ◽  
Carolina A Díaz
Keyword(s):  
Aquatic Systems ◽  
International Literature ◽  
Southern Chile ◽  
Didymosphenia Geminata ◽  
Two Samples ◽  
Chemical Factors ◽  
Mat Thickness ◽  
Physical And Chemical ◽  
The Relationship ◽  
Main Producer

Didymosphenia geminata is a diatom that can alter aquatic systems. According to the international literature, chemical and hydraulic factors have a greater influence on the proliferation of D. geminata, but the study of other microalgae that could be associated with it has been poorly addressed. The objective of this study is to evaluate the relationship between the structure of mat thickness D. geminata and another taxon that produces mucilage, Cymbella sp., while also considering physical and chemical factors. To do this, two samples were taken, one in the spring of 2013 and the other in the autumn of 2014, from eight rivers in central-southern Chile-South America, where the benthic community was characterized and the thickness of the mat was measured. The results indicate that in the presence of both taxa the thickness of the mat layer is doubled. However, antecedents suggest that D. geminata is the main producer of mucilage, being seconded by Cymbella sp. The present study contributes evidence about the relationship between mat thickness D. geminata and other microalgae contribution, and aquatic condition for this development.

scholarly journals A Preliminary Study on the Relationship between Micronucleus Formation and Cell Cycle

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Ku Weihao
Keyword(s):  
Cell Cycle ◽  
Micronucleus Formation ◽  
Abnormal Structure ◽  
Interphase Cells ◽  
Dividing Cells ◽  
Chemical Factors ◽  
Preliminary Study ◽  
Physical And Chemical ◽  
The Relationship

Micronucleus is an abnormal structure in eukaryotic cells. It is the result of various physical and chemical factors,such as radiation and chemical drugs acting on dividing cells. It is generally believed that micronuclei are originatedin backward chromosomes and fragments that have lost centromere and are formed at the end of mitosis. However,other experiments suggest that interphase cells can also form micronuclei. In this study, human peripheral bloodlymphocytes were cultured in vitro and cyclophosphamide 20 ug/ml was injected at specifi c times of the cell cycle toobserve the relationship between micronuclei formation and cell cycle. The experimental results confi rmed that thecell cycle micronucleus formation.

scholarly journals ANALISIS KELIMPAHAN UDANG GALAH (Macrobrachium rosenbergii) DI SUNGAI MENDUK KABUPATEN BANGKA

2018 ◽  
Vol 12 (2) ◽  
pp. 1-8
Author(s):  
Bobby Fajrilian
Keyword(s):  
Correlation Coefficient ◽  
Macrobrachium Rosenbergii ◽  
Research Station ◽  
Chemical Parameters ◽  
Chemical Factors ◽  
Relationship Of ◽  
Physical And Chemical ◽  
The Relationship ◽  
Potential Level

Menduk River is a river located in Menduk Village, Mendo Barat, Bangka District. Abundance is used to measure and calculate the number of lobster that found in menduk river. It can describe the potential level of lobster present in the Menduk River. The purpose of this study is to calculate the abundance of catches of lobster and to know the parameters of physics and chemistry on menduk river then Analyze the relationship of physical and chemical factors of waters to the abundance of catches lobster. Determination of research station is done by using method of purposive sampling with correlation coefficient analysis. The catch of Galah Udang on March 11 tails and 9 tails in April. The highest correlation coefficient value of water temperature is 0.95 and the lowest value is pH 0.14. The results show that most temperatures influence the catch compared to other physical and chemical parameters.

scholarly journals INFLUENCE OF PHOSPHORUS IMPURITY ON THE STRUCTURE AND NATURE OF THE DESTRUCTION OF THE GENUINE DAMASCUS STEEL

2020 ◽  
Vol 5 (4) ◽  
pp. 26-37 ◽  
Author(s):  
Dmitry Sukhanov
Keyword(s):  
Impact Load ◽  
High Carbon Steel ◽  
High Carbon ◽  
Damascus Steel ◽  
X Ray ◽  
Chemical Factors ◽  
Phosphorus Impurity ◽  
Knife Blade ◽  
Physical And Chemical ◽  
The Relationship

It is established that the ancient knife blade belongs to the Eastern group of Indo-Persian steel type genuine Damascus steel with a pattern of "Kara-Taban", which literally means blackshiny. The methods of spectral, x-ray phase and optical analysis show that the genuine Damascus steel is a high-purity non-alloy high-carbon steel with a high content of phosphorus. It is revealed that phosphorus, having a high segregation coefficient of impurity contributes to the process of segregation of carbon in the process of crystallization of crucible ingots. The main physical and chemical factors influencing morphology of structure formation of genuine Damascus steel are revealed. It is established the relationship between the structure and the nature of the destruction of the genuine Damascus steel under impact load.

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