The Inhibition Effect Mechanism of Pyrazole on Cobalt Corrosion in Alkaline Solution

Despite the unmistakable beneficial effect of clopidogrel on platelet aggregation,still there are some patient poorly responds to clopidogrel that may lead to worse cardiovascular clinical events.One hundred and twenty seven patients with cardiovascular disease (ACS,stroke,or TIA) were enrolled as a study group. Patients were recruited at coronary care unit (CCU) of Al-Yarmouk Teaching Hospital. Paletlet assessment was done by using light transmission aggregometry. between the patients that enrolled in this study there are significant inter-individual variability both skewness and Kurtosis were negative (-0.450,-0.130) respectively. 24% of patient enrolled in this study were hyporesponder.

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Inhibition Effect Extract Stolephorus insularis as a Antimicroba in Staphylococcus aereus Bacteria

DENTA ◽

10.30649/denta.v12i1.165 ◽

2018 ◽

Vol 12 (1) ◽

pp. 22

Author(s):

Ayu Listya ◽

Yulie Emilda Akhwan

Keyword(s):

Staphylococcus Aureus ◽

Root Canal ◽

Quantitative Research ◽

Media Culture ◽

Root Canal Treatment ◽

Research Needs ◽

Dmso Solution ◽

Entire Surface ◽

Inhibition Effect ◽

Inhibitory Power

<pre>Background : Untreated caries will continue and microorganisms enter the pulp resulting in an inflammatory response and pulp necrosis. Sterilization is one part of root canal treatment and is important for the success of root canal treatment. Stolephorus insularis contains antibacterial substances such as fluor. Previous research showed that extract Stolephorus insularis has antibacterial activity in Streptococcus mutans bacteria.</pre><pre>Purpose : This study aims to determine the antibacterial power of Stolephorus insularis extract on the growth of Staphylococcus aereus bacteria by using 3 concentrations of 18%, 24% and 30%.</pre><pre>Material and Method :This resesarch use culture of Staphylococcus aereus bacteria in MH blood agar, Stolephorus insularis extract with various concentrations (18%, 24%, 30%), 7% Na CMC, 1% DMSO solution, agar BHI media. Culture of Staphylococcus aereus was taken from liquid BHI media, then rubbed on the entire surface of BHI media using a sterile cotton stick. The antibacterial zone formed is measured.</pre><pre> </pre><pre>Result : Based on the results of the Mann-Whitney test there were significant differences in the inhibitory power of Staphylococcus aureus bacteria (p <0.05) in the K + group with groups K-, P1, P2 and P3. Whereas between groups P1 with K-, group P2 with K- and P1, and group P3 with K-, P1 and P2 there were no significant differences because the significant value was greater than 0.05</pre><pre>Conclusion : There is no antimicrobial power at concentrations of 18%, 24%, and 30%. Quantitative research needs to be done to determine the decrease in the number of bacterial colonies.</pre> Keywords : Inhibition effect, Stolephorus insularis, Staphylococcus aereus Correspondence : Ayulistya Paramita, Paediatric Departemen. FKG UHT, Jl Arief Rahman Hakim no 150 Surabaya. email : [email protected]

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The Effect of Dry Mix Sodium Hydroxide onto Workability and Compressive Strength of Geopolymer Paste

International Journal of Integrated Engineering ◽

10.30880/ijie.2020.12.09.014 ◽

2020 ◽

Vol 12 (9) ◽

Author(s):

A. Z. Mohd Ali ◽

◽

N. A. Jalaluddin ◽

N. Zulkiflee ◽

◽

...

Keyword(s):

Compressive Strength ◽

Fly Ash ◽

Sodium Hydroxide ◽

Sodium Silicate ◽

Alkaline Solution ◽

High Emission ◽

New Material ◽

Curing Regime ◽

Solid Form ◽

Geopolymer Paste

The production of ordinary Portland cement (OPC) consumes considerable amount of natural resources, energy and at the same time contribute in high emission of CO2 to the atmosphere. A new material replacing cement as binder called geopolymer is alkali-activated concrete which are made from fly ash, sodium silicate and sodium hydroxide (NaOH). The alkaline solution mixed with fly ash producing alternative binder to OPC binder in concrete named geopolymer paste. In the process, NaOH was fully dissolved in water and cooled to room temperature. This study aims to eliminate this process by using NaOH in solid form together with fly ash before sodium silicate liquid and water poured into the mixture. The amount of NaOH solids were based on 10M concentration. The workability test is in accordance to ASTM C230. Fifty cubic mm of the geopolymer paste were prepared which consists of fly ash to alkaline solution ratio of 1: 0.5 and the curing regime of 80℃ for 24 hours with 100% humidity were implemented. From laboratory test, the workability of dry method geopolymer paste were decreased. The compressive strength of the dry mix of NaOH showed 55% and the workability has dropped to 58.4%, it showed strength reduction compared to the wet mix method.

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Chemical deposition of hard composite coatings Ni–Cu–P–Cr2O3

10.36652/1813-1336-2020-16-4-179-181 ◽

2020 ◽

pp. 179-181

Author(s):

A.A. Abrashov A.A. ◽

E.G. Vinokurov ◽

M.A. Egupova ◽

V.D. Skopintsev

Keyword(s):

Chromium Oxide ◽

Alkaline Solution ◽

Composite Coatings ◽

Chemical Deposition ◽

Alkaline Solutions ◽

Functional Surface ◽

Heat Treated ◽

Weakly Acid Solution ◽

Coating Composition ◽

Weakly Acidic Solution

The technological (deposition rate, coating composition) and functional (surface roughness, microhardness) characteristics of chemical composite coatings Ni—Cu—P—Cr2O3 obtained from weakly acidic and slightly alkaline solutions are compared. It is shown that coatings deposited from slightly alkaline solution contain slightly less phosphorus and chromium oxide than coatings deposited from weakly acid solution (2...3 % wt. phosphorus and up to 3.4 % wt. chromium oxide), formed at higher rate (24...25 microns per 1 hour of deposition at temperature of 80 °C), are characte rized by lower roughness and increased microhardness. The Vickers microhardness at 0.05 N load of composite coatings obtained from slightly alkaline solution and heat-treated at 400 °C for 1 hour is 13.5...15.2 GPa, which is higher than values for coatings deposited made of weakly acidic solution. The maximum microhardness of coatings is achieved at concentration 20 g/l of Cr2O3 particles. The technology of chemical deposition of Ni—Cu—P—Cr2O3 coatings formed in slightly alkaline solution is promising for obtaining of materials with increased hardness and wear resistance.

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