| Author (s): |
GRIMA-GALLARDO, Pedro; DURÁN, Sonia; MUÑOZ, Marcos; RAI, Dibya P.; DELGADO, Gerzon E.
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| Title: |
(Cu0.4Al0.3)TaSe2: PREPARATION AND CRYSTAL STRUCTURE ANALYSIS FROM X-RAY POWDER DIFFRACTION |
| Abstract: |
A new phase of the (CuAlSe2)1-x(TaSe)x alloy system was synthesized by the melt and annealingtechnique and studied by SEM, DTA, and XRPD techniques. Its structure has been refined by the Rietveld methodusing X-ray powder diffraction data. The new alloy corresponds with the stoichiometry Cu0.4Al0.3TaSe2. Thiscompound crystallizes in the hexagonal space group 𝑃6ത𝑚2 (Nº 187) with a MoS2-type structure, and unit cellparameters a = 3.455(2) Å, c = 13.423(4) Å, V = 138.7(1) Å3, Z =2. The crystal structure is based on the MoS2-type of stacking of TaSe2 layers with a partial ordering of Cu and Al cations over the tetrahedral sites. The powderpattern was composed of 63.1% of the principal phase Cu0.4Al0.3TaSe2 and 29.9% of CuAlSe2, 7.0% of TaSe3, asthe secondary phases.
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| Keywords: |
Alloys, X-ray diffraction, crystal structure, MoS2 type.
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| Year: |
2020
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| Initial page: |
1
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| Final page: |
6
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v28.n29.2020.01_DELGADO_pgs_01_06.pdf |
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| Author (s): |
QASIM, Mohammed Jasim; FALIH, Israa Qusay
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| Title: |
REVIEW ABOUT DIABETES MELLITUS AND URINARY TRACT INFECTIONS |
| Abstract: |
Diabetes mellitus (DM) is a clinical disease correlated with a deficiency of insulin secretion or action.It is one of the leading causes of morbidity and mortality worldwide. The global burden of diabetes is rising dueto increasing obesity and population aging. Urinary tract infections (UTI) are common microbial infections knownto affect the different parts of the urinary tract accounting for major antibacterial drug consumption. About 150million UTI cases were diagnosed every year. Urinary tract infections are the most important and most commonsite of infections in a diabetic patient. Diabetic patients have been found to have a 5-fold frequency of acutepyelonephritis at autopsy than non-diabetics. Most of the urinary tract infections in patients with diabetes arerelatively asymptomatic. The presence of this syndrome predisposes to much more severe infections,particularly in patients with acute ketoacidosis, poor diabetic control, diabetic complications such as neuropathy,vasculopathy, and nephropathy. The Gram-negative aerobic bacilli are the large group of bacterial pathogensthat cause UTI with few species of Gram-positive bacteria. However, some fungi, parasites, and viruses havealso been reported to invade the urinary tract. Urinary tract infection affects women more than men due toseveral factors such as proximity of the genital tract to the urethra, anatomy of the female urethra, sexualactivity, menopause, and pregnancy. Other possible risk factors of UTI include allergy, obesity, diabetes, pasthistory of UTI, contraceptive use, catheter use, and family history.
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| Keywords: |
Diabetes millitus, urinary tract infections, risk factors, pathogenesis, antibiotic resistance..
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| Year: |
2020
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| Initial page: |
7
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| Final page: |
16
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v28.n29.2020.02_QASIM_pgs_07_16.pdf |
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| Author (s): |
BAHRAMI, Saeed
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| Title: |
INVESTIGATING THE EFFECT OF COLD TEMPERATURE STRESS ON UNOPENED MALE CATKINS AND INOCULATED FEMALE FLOWERS OF IRANIAN NATIVE HAZELNUT CULTIVARS |
| Abstract: |
In many low-temperature areas, the environmental factor is an important limiting factor for the production and distribution of horticultural plants. This study aimed to investigate the cold tolerance of the male catkins and inoculated female flowers to screen the popular native hazelnut cultivars in Qazvin under low-temperature stress. A completely randomized factorial block design with three replications was used in this experiment with eight cultivars (Nakhnroud, Khandan, Mish-Pestan, South of Qarabagh, Asl-e-Qarabagh, Rasmi, and Gerdashkevar). After removing each of the treated samples at the end of the experiment, the samples were examined morphologically (appearance) and compared with the control. The changes were recorded as qualitative traits. To understand the influence of cold stress on reproductive organs, hydrogen peroxide and proline were measured. The results showed the onset of freezing in unopened male catkins at -7 and -9 °C and in inoculated female flowers at -3 °C. Damage to unopened male catkins' tissue occurred at -11 °C and in female flowers at -5 °C. The highest value observed among cultivars in the case for proline content of male catkins was in Mish-Pestan and Khandan cultivars with 0.816 and 0.660 µmol/ g FW, respectively. In inoculated female flowers, Mish-Pestan and Tabestaneh cultivars with 0.185 and 0.168 µmol/ g FW, respectively, showed the highest statistically significantincrease in proline content. Interestingly, the cultivars with the highest proline content in male catkins indicated the most increase in H2O2; Mish-Pestan and Khnadan with 0.569 and 0.541 ug/g FW, respectively. Asl-eQarabagh was observed to have the least H2O2 content (0.042 ug/g FW) among cultivars. Again, in inoculated female flowers, those with the highest concentration of proline (Mish-Pestan and Tabestaneh) were found to have the highest H2O2 content (0.335 and 0.331 ug/g FW, respectively
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| Keywords: |
Low-temperature stress, proline, hydrogen peroxide, discoloration, morphological traits .
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| Year: |
2020
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| Initial page: |
17
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| Final page: |
27
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v28.n29.2020.03_BAHRAMI_pgs_17_27.pdf |
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| Author (s): |
FIDELIZ, Fábio Vinícius; SILVA, Thiago Augusto Andrade da; FERREIRA, Mariana Babilone de Souza
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| Title: |
CALCULATION FOR REDEMPTION OF COMPACT TESTING BY THE PROCTOR METHOD THROUGH NEWTON’S GRAVITATIONAL POTENTIAL ENERGY |
| Abstract: |
Throughout this article, a study on the characteristics of the compaction test by the Proctor Method, regulated by ABNT NBR-7182, which is used to verify the degree of soil compaction, will be approached in order to broaden the discussion and raise points that demonstrate the urgent need to make it more accurate, efficient and safe. Through qualitative and quantitative research carried out by the authors of this article, it sought to collect data through a questionnaire for professionals in the field of geotechnics in the “Quadrilátero Ferrífero” region in Minas Gerais. In addition to other relevant data for the topic, it was raised that of the 22 professionals from the participating region, 72.7% of the total belief that the manual compaction test can be manipulated by an operator during the test execution, failing to generate results reliable, thus showing the importance of the proposed theme. In this way, we initially sought to correlate the Compaction Energy formula idealized by Ralph Proctor with Isaac Newton’s Gravitational Potential Energy formula and, through it, present the resizing, which may enable the construction of manual, semi-automatic human propulsion machines (not or making the automated ones that depend on electricity available to the market. In conclusion, from the mathematical calculations, it was possible to evidence the use of Newton’s Gravitational Potential Energy to constructnew equipment to carry out this test.
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| Keywords: |
civil construction, compaction test, proctor test..
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| Year: |
2021
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| Initial page: |
28
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| Final page: |
36
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v28.n29.2020.04_Babilone_pgs_28_36.pdf |
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| Author (s): |
RAMÍREZ, Jeans Wills; GUILLEN, Marilia; DELGADO, Gerzon E.
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| Title: |
EXTRACTION AND CHARACTERIZATION OF CURCUMIN FROM TURMERIC RHIZOMES GROWN IN MÉRIDA, VENEZUELA |
| Abstract: |
The extraction of naturally occurring compounds is one of the fastest-growing industries because of its benefits against its synthetic analogs. Environmental protection must require the use of natural products instead of chemicals to minimize pollution. Thus, this investigation studies the use of some natural product, as curcumin, as naturally occurring acid‐base indicators. Curcumin can be used as acid-base indicators since it was found that it possesses pH-dependent solubility. Curcumin, the major active component of turmeric, Curcuma longa (Zingiberaceae), is used as a spice in curry and as a coloring agent in yellow mustards, cosmetics, pharmaceuticals, and hair dyes. In this research, the main compound colored rhizome of turmeric (Curcuma longa) cultivated in Mérida, Venezuela, is extracted: Curcumin (C21H20O6) (1E,6E)-1,7-bis(4-hydroxy-3-methoxyphenyl)-1,6-heptadiene-3,5-dione, in a yield of 3.42% after 8 hours of extraction using soxhlet extractor system with organic solvents (hexane and ethanol). The thin-layer chromatography and column performed separation and purification using a mobile phase, a mixture of chloroform-hexane 3:2. The dye was characterized by spectroscopic analysis of visible ultraviolet (UV-Vis) and infrared (IR), in addition to his studio in steering sensitivity as an acid-base indicator. This dye is useful as an acid-base indicator in strong acid-strong base volumes and did not require large amounts of it as it has high sensitivity. The results indicate that curcumin as an acid-base indicator allows the development of new standards in different chemistry fields that require this type of analysis.
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| Keywords: |
Curcuma longa, curcumin, acid-base indicator, soxhlet extraction, chromatography.
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| Year: |
2020
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| Initial page: |
37
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| Final page: |
45
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v28.n29.2020.05_RAMIREZ_pgs_37_45.pdf |
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| Author (s): |
DA ROSA, Flávia Sapper; LHAMBY, Andressa; GUILLET, Vinicyus Mourão Monteiro; KLUNK, Marcos Antônio; CAETANO, Nattan Roberto
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| Title: |
THERMAL AND ECONOMIC ANALYSIS OF LIME PRODUCTION |
| Abstract: |
The ore beneficiation process uses little technology, but mining companies have high economic performance. As an energy source, firewood plays a fundamental role due to its simple storage, low cost, great availability of forests, and lack of processing. Thus, the present work aims to analyze the consumption of firewood as fuel and possible improvements in the process for the production of lime in terms of harnessing raw materials and costs. Calcium oxide is obtained from the thermal decomposition of calcium and magnesium carbonates obtained from dolomitic deposits of limestone (CaCO3 : CaMgCO3). After CaO extraction, it is subjected to a calcination process, removing carbon dioxide (CO2) in ovens that work at temperatures between 900 and 1200°C. The source of energy applied to the calcination furnaces in the analyzed area is wood. The wood has a calorific value between 2,250 and 2,700 Kcal/Kg, but the moisture content responsible for the thermal variation must be considered. The firewood burning process was carried out in a ravine type oven where the temperature at which operators are exposed to heat was evaluated. The results indicated that the cooking time dropped by 20% as the amount of wood is fed into the oven. This increase represents a significant gain in lime production, thus leading to a higher profit for the company.
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| Keywords: |
Calcination, limestone, firewood, dolomite, biomass.
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| Year: |
2020
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| Initial page: |
46
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| Final page: |
54
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v28.n29.2020.06_ROSA_pgs_46_54.pdf |
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| Author (s): |
DA SILVA, Deoclécio Junior Cardoso; CAETANO, Nattan Roberto; DOS SANTOS, Antonio Vanderlei; GODOY, Leoni Pentiado; KLUNK, Marcos Antônio
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| Title: |
REUSE RESIDUAL SAND CASTING FOR PRODUCTION OF CONCRETE BLOCKS |
| Abstract: |
Sand casting is a viable waste as an alternative raw material, regarding a good solution in the production of concrete blocks. The use of sand casting to produce concrete blocks is performed by about 80% of the productive capacity of the company considered in this study. Thus, this work aims to make an improvement by applying fuzzy logic. The methodology was applied from the formulation of ranking criteria, which improved the production process. Therefore, after the implementation of the established criteria, was achieved an improvement of about 10%. Thus, the results achieved can help companies, generating alternatives with more excellent reliability and assertiveness. Moreover, Fuzzy is a methodology that provides strong support for decision making, supporting subjective and intuitive criteria.
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| Keywords: |
Fuzzy logic, production management, concrete blocks, sand casting.
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| Year: |
2020
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| Initial page: |
55
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| Final page: |
65
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v28.n29.2020.07_DASILVA_pgs_55_65.pdf |
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| Author (s): |
Sharba, Intisar Razzaq; Al-Dujaili, Arshad Noori
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| Title: |
E-SELECTIN AS A BIOMARKER IN FEMALE PATIENTS WITH Β-THALASSEMIA IN AL- NAJAF PROVENCE, IRAQ |
| Abstract: |
E-selectin, as identified (CD62E), is expressed on endothelial cells after stimulation with inflammation cytokines. β-Thalassemia diseases (βT) and early diagnosis are of utmost significance in the entire world population. This study was performed in the Thalassemia Center of the Al-Zahraa Educational Hospital in Al-Najaf Province, Iraq, on sixty-nine with β-thalassemia (54 βT major and 15 βT Intermedia) aged 8-40 years who transfused blood. Compared to 20 healthy volunteers as a control group. In both βT patients and healthy groups were assessed serum E-selectin levels. It was investigated the relationship with RBC, Hb, PCV, WBC, PLT, BMI, splenic status, iron, and ferritin levels. The results revealed a significant (P<0.05) decreased values of HB, RBC, P.C.V, and BMI. In contrast, values of WBC, PLT, Iron, and Ferritin were significantly increased in βT patients as compared to the healthy control groups. A significant (P<0.05) increase in serum E- Selectin level in βT patients (20.55±0.47) ng/ml to compare with the healthy group (9.16±0.50) ng/ml. Furthermore, it was a significant decrease in groups of βT major (19.87±0.42) ng/ml more than in βT intermedia (23±1.42) ng/ml. E-Selectin revealed a significant increase (P<0.05) in progress age and associated with splenectomies and underweight groups compared to splenectomies and the normal weight groups, respectively. Also, E-Selectin levels significantly positively correlated with WBC, PLT value, iron, and Ferritin levels. However, it was no significant with RBC, PCV, Hb. As a conclusion from this study, E- Selectin is an important biomarker in β-thalassemia patients can be identified as the complications associated with iron overload, inflammatory process, and endothelial dysfunction in βT disease.
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| Keywords: |
E-Selectin, inflammation cytokines, iron overload, endothelial dysfunction.
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| Year: |
2020
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| Initial page: |
66
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| Final page: |
73
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v28.n29.2020.08_Sharba_pgs_66_73.pdf |
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