| Author (s): |
ZHANAR ZHUMADILOVA; KENZHEBEK AKMALAIULY
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| Title: |
HEAT DISSIPATION AT CEMENT HARDENING |
| Abstract: |
During the construction of concrete structures of small cross-sections, the release of heat during cementhardening has no harmful effects. With the increasing temperature of the hardening cement mass, the rate ofcement hydration increases. This increases the rate of release of its heat of hydration of cement. Theconsequence of the accelerated process of hydration of the binder is a more intensive increase in the strengthof cement stone than in the case of hardening under normal conditions. This fact is widely used in practice forthe intensification of the hardening of concrete. When structures with small cross-sections are being built, theheat released during hardening is relatively quickly transferred to the surrounding space and does not cause asignificant increase in temperature. In structures made of massive concrete (with a large cross-section), thisheat is stored in the interior of the array for a long time, which causes a rather large rise in temperature and itsslow drop. This is due to the fact that heat transfer to the external environment is hampered here by theconsiderable thickness of the massif and the rapid rate of concreting, mechanized laying of large masses ofconcrete. As a result, a temperature difference is created between the internal and external parts of thestructure and harmful internal stresses arise that can cause cracking in the hardened concrete. This leads to aviolation of its solidity. The faster cement hydrates, the sooner and more heat is released. The types of cementswith a high content of tricalcium silicate and aluminate emit more heat and rather than types of cement with ahigh content of dicalcium silicate and tetra-calcium aluminoferrite. However, the latter has a lower strength. Theincrease in strength resulting from the hydration process is inevitably associated with the release of heat into theenvironment. C
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| Keywords: |
oncrete, hydration, minerals, temperature, strength..
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| Year: |
2020
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| Initial page: |
1
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| Final page: |
9
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v28.n28.2020.01_ZHUMADILOVA1_pgs_01_09.pdf |
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| Author (s): |
VOSTRIKOVA, Tatiana V.; KALAEV, Vladislav N.; MEDVEDEVA, Svetlana M.; LEDENEVA, Irina V.; SHIKHALIEV, Khidmet S.
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| Title: |
QUINOLINE DERIVATIVES AS GROWTH REGULATORS FOR ORNAMENTAL PLANTS |
| Abstract: |
It is investigated the effect of synthesized organic compounds of 6-hydroxy-2,2,4-trimethyl-1,2- dihydroquinoline, its derivatives, and hydrogenated analogs. These compounds affected the height of seedlings when they were used for pre-sowing seed treatment of the following ornamental plants: annual ornamental grass – scarlet sage (Salvia splendens) and woody plant – yellow rhododendron (Rhododendron luteum). Prior to the sprouting process, the seeds of Rh. luteum and S. splendens were soaked in water solutions of compounds with concentrations of 0.01%, 0.05%, and 0.1% for 18 hours. Dihydro- and tetrahydroquinolines with a concentration of 0.05% proved to be the most effective for both plants. For Rhododendron luteum, the compounds of 6-hydroxy-2,2,4-trimethyl-1,2-dihydroquinoline, its derivatives, and hydrogenated analogs with a concentration of 0.1% proved to be the most effective. Dihydroquinolines at concentrations of 0.05 and 0.1% proved to have the strongest effect when applied to the studied perennial woody plant (Rhododendron luteum). Dihydroquinoline at the concentration of 0.05% also proved to be effective when applied to the annual grass (Salvia splendens). For annual S. splendens, tetrahydroquinoline at concentrations of 0.01 and 0.05% appeared to be the most effective. The pre-sowing seed treatment of grass Salvia splendens and woody plant Rhododendron luteum with the studied compounds demonstrated that their effect on the height of the seedlings is species-specific. The pre-sowing seed treatment of Rh. luteum and S. splendens allows increasing the height of the seedlings by 3-61 % and 17-25 %, respectively. It is suggested using the compounds of 6-hydroxy-2,2,4- trimethyl-1,2-dihydroquinoline, its derivatives, and hydrogenated analogs as effective growth stimulators for ornamental grasses and woody plants.
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| Keywords: |
Quinolinic compounds, growth regulators, grasses, woody plants.
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| Year: |
2020
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| Initial page: |
10
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| Final page: |
16
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v28.n28.2020.02_VOSTRIKOVA_pgs_10_16.pdf |
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| Author (s): |
GHAFIYEHSANJ, Elham; DILMAGHANI, Kamaladdin; CHAPARZADE, Nader; SAADATMAND, Sara
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| Title: |
COMPARATIVE STUDY ON ANTIOXIDANT ACTIVITY OF SALVIA NEMOROSA L. FROM TWO DIFFERENT LOCATIONS |
| Abstract: |
In order to investigate the antioxidant activity of Salvia nemorosa L. collected from Ahar and Urmia regionsin Iran at different growth stages, aerial parts of sage after collecting were dried, and for measurement, the abilityof scavenge DPPH (2,2-diphenyl-1-picryl-hydrazyl-hydrate) radical in different concentrations (0.025, 0.05, 0.07,0.1, 0.2, 0.04 and 0.6) of methanolic extracts were prepared. The result showed that the ability to scavenge DPPHradical and amount of inhibition percent of vegetative stage leaves, flowering stage leaves, and flowers increasedwith increasing concentrations of methanolic extracts from 0.25 to 0.6 mg/mL. In the region of Urmia, the highestamount of DPPH inhibition there was in vegetative stage leaves, and the lowest amount of DPPH inhibition wasseen in flowers. In Ahar regions, unlike the Urmia region, the highest amount of DPPH inhibition there was inflowers, but the lowest of DPPH inhibition was seen in flowering stage leaves. Also, the content of inhibition ofDPPH in Ahar and Urmia regions similarly increased between two phenological stages (vegetative stage leaves,flowering stage leaves, and flowers) in 0.4 mg/mL and 0.6 mg/mL concentrations.
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| Keywords: |
Lamiaceae, salvia nemorosa, antioxidant activity, methanolic extracts, 2,2-diphenyl-1-picrylhydrazyl.
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| Year: |
2020
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| Initial page: |
17
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| Final page: |
21
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v28.n28.2020.03_GHAFIYEHSANJ_pgs_17_21.pdf |
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| Author (s): |
OKAB, Alaa Abood Yasir; SALIH, Manal B.
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| Title: |
ANTIBIOTIC SUSCEPTIBILITY OF ESCHERICHIA COLI ISOLATE FROM URINARY TRACT INFECTION OF THALASSEMIC PATIENTS IN THI-QAR PROVINCE |
| Abstract: |
Escherichia coli (E. coli) is the most common type of pathogen that causes Urinary tract infection disease. It can be presented as a pathogenic or non-pathogenic strain and found not only in the animal but also in the human intestine. This bacterium can cause opportunistic infection when the human host comprised of thalassemia patients or changes the healthy hemostatic flora. This study aimed to analyze the presence of bacteria in thalassemia patients with urinary tract infection. A total of 303 samples were collected during the period from August 2019 to January 2020 from thalassemia patients who suffered from urinary tract infection. The results showed that there were 6.9% of patients infected with E. coli, 2.6% of patients were infected with S. aureus, 0.7% with both Proteus and Klebsiella, while 89.1% of patients had a negative sample for bacteria. Also, the incidence of urinary tract infections in females is higher than in males. Besides, its occurrence in rural areas is higher than in city residents. Moreover, among 16 antibiotics tested to sensitize bacteria to antibiotics, Imipenem showed 100% efficacy on all isolated bacteria. In contrast, Netilmicin showed 80.1% efficacy, Gentamycin 80.1%, and Amikacin 76.2%. Ampicillin, Aztreonam, Amoxicillin-Clavulanic Acid, Tetracycline, and Ticarcillin-Clavulanic Acid, did not show any effectiveness toward the bacteria while other antibiotics showed different activities. Furthermore, the isolated microbes from thalassemia patients were the highest resistance to antibiotics in comparison with other studies, and this antibiotic-resistant may be due to the weakening of the patient's immune status and frequent blood taking and the antibodies it contains.
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| Keywords: |
Thalassemia, urinary tract infection, bactéria, Escherichia coli, antibiotics.
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| Year: |
2020
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| Initial page: |
22
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| Final page: |
33
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v28.n28.2020.04_OKAB_pgs_22_33.pdf |
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| Author (s): |
GHAFIYEHSANJ, Elham; DILMAGHANI, Kamaladdin; CHAPARZADE, Nader; SAADATMAND, Sara
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| Title: |
STUDY ON THE DPPH FREE RADICAL-SCAVENGING ACTIVITY OF SALVIA NEMOROSA L. AT TWO GROWTH STAGES |
| Abstract: |
This study was designed to examine the DPPH free radical-scavenging activity, in different concentrations (0.025, 0.05, 0.07, 0.1, 0.2, 0.04 and 0.6) of methanolic extracts of Salvia nemorosa L. collected from the northwest of Iran (Zonouz and Ardabil regions) at two-stage of growth (vegetative stage leaves, flowering stage leaves, and flowers). The result showed that the mean of inhibition percentage in the Zonouz region increased in various concentrations and between flowers, vegetative stage leaves, and flowering stage leaves, compared with the plants of the Ardabil region. In each of the regions of Zonouz and Ardabil, the highest amount of DPPH inhibition was observed in the vegetative stage leaves in comparison with flowering stage leaves and flowers. In addition, in the effect of DPPH radical trapping in different concentrations of methanolic extracts of Salvia nemorosa L. was observed that from each of the collected region, methanolic extracts from sage plants were dose-dependent and acted very effective and useful and the best antioxidant activity was in the high concentration of extracts, So in Zonouz and Ardabil regions, the content of inhibition of DPPH increased significantly, by increasing the concentration of 0.025 mg/ml to 0.6 mg/ml and in Zonouz region the content of inhibition of DPPH similarly increased in 0.2, 0.4 and 0.6 mg/ml concentrations. In the Ardabil region, the most content of inhibition of DPPH was seen in 0.4 mg/ml and 0.6 mg/ml concentrations, but in this region, the content of inhibition of DPPH in 0.2 mg/ml concentration there was only in vegetative stage leaves and flowering stage leaves.
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| Keywords: |
Salvia nemorosa, lamiaceae, growth stage, antioxidant activity, 2,2-diphenyl-1-picrylhydrazyl (DPPH).
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| Year: |
2020
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| Initial page: |
35
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| Final page: |
39
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v28.n28.2020.05_GHAFIYEHSANJ_pgs_34_39.pdf |
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| Author (s): |
VOSTRIKOVA, Tatiana V.; KALAEV, Vladislav N.; POTAPOV, Andrey Yu.; VANDYSHEV, Dmitry Y.; SHIKHALIEV, Khidmet S.
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| Title: |
USING SYNTHESISED ORGANIC COMPOUNDS AS ENVIRONMENTALLY FRIENDLY RETARDANTS FOR ORNAMENTAL PLANTS |
| Abstract: |
The pre-sowing treatment of scarlet sage (Salvia splendens Ker Gawl.) seeds with 4-methyl-2-piperidin1-yl-pyrimidine-5-carboxylic acid at concentrations of 0.01, 0.05, and 0.1% proved to have an obvious inhibiting effect. Prior to sowing, the seeds of Salvia splendens were soaked in a water suspension of 4-methyl-2-piperidin-1-yl-pyrimidine-5-carboxylic acid and 4-methyl-2-morpholin-4-pyrimidine-5-carboxylic acid with concentrations of 0.01%, 0.05%, and 0.1% for 18 hours. On the 42nd day of the experiment, the seedlings, having been preliminarily hardened for 12 days, were removed from the greenhouse and planted on the field. The pre-sowing treatment of Salvia splendens seeds with 4-methyl-2-morpholin-4-pyrimidine-5-carboxylic acid proved to have the inhibiting effect at concentrations of 0.01 and 0.05%. The height of the seedlings decreased by 13.3-43.7%. It was revealed that 4-methyl-2-piperidin-1-yl-pyrimidine-5-carboxylic acid at concentrations of 0.01, 0.05, and 0.1% decreased the growth of the seedlings by 30.4-43.7%, and 4-methyl-2-morpholin-4-pyrimidine-5-carboxylic acid at concentrations of 0.01 and 0.05% decreased the growth of the seedlings by13.3-22.2%. By contrast, the effect of pyrimidinecarboxylic acids on seed germination and plant height of another annual flower – spreading marigold (Tagetes patula L.) was stimulating. It was investigated some different concentrations from 0.01 to 0.05 %. The same concentrations of identical compounds were tested, but effects from them were opposite for Tagetes patula, and Salvia splendens seedlings. Сonsequently, the species-specific effect of pyrimidinecarboxylic acids on seed germination and plant height for ornamental grasses takes place. Therefore,4-methyl-2-piperidin-1-yl-pyrimidine-5-carboxylic acid and 4-methyl-2-morpholin4-pyrimidine-5-carboxylic acid are recommended as growth retardants for Salvia splendens.
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| Keywords: |
Synthesized organic compounds, pyrimidinecarboxylic acids, grasses, retardants.
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| Year: |
2020
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| Initial page: |
40
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| Final page: |
44
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v28.n28.2020.06_VOSTRIKOVA_pgs_40_44.pdf |
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| Author (s): |
ALSHAYBAN, Dhafer; JOSEPH, Royes; LUCCA, Jisha; ALJISHI, Fatimah; ALSADIQ, Yara
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| Title: |
MISUSE AND ABUSE OF DRUGS: A CROSS-SECTIONAL SURVEY AMONG PHARMACY PROFESSIONALS IN SAUDI ARABIA |
| Abstract: |
Prescription and non-prescription medication misuse or abuse is a global problem that has a negative impact on all human life aspects, including health, social, economic, and security status. According to the United Nations Office on Drug and Crime reports, over 5% of adult people used drugs at least once in the year 2015, and 29.5 million of them were suffered from the consequences of inappropriate use of drugs. Information on the knowledge and perception among pharmacists regarding the misuse and abuse medications in Saudi Arabia are limited, and therefore, a study was conducted among pharmacy staff to assess their knowledge and awareness on drug misuse and abuse. A cross-sectional study was carried out in Eastern Province, Saudi Arabia. Pharmacy professionals with more than three months of experience were included in the study. A structured questionnaire was used to obtain the participant's responses. A Chi-square test was used to evaluate the association of sociodemographic factors with the participant's responses. Ninety pharmacy professionals were responded. Overall, 69 (76.7%) participants agreed that misuse and abuse are two different terms. In addition, the study showed different responses for patients who suspected to be medication abusers. In conclusion, this study provides an initial picture of pharmacy staffs' knowledge and opinion regarding the misuse and abuse of medicines in Saudi Arabia. Participants' reactions toward such behaviors were different and not consistent. Therefore, there should be a clear policy to define the role of the pharmacy staff toward the misuse and abuse of medication in Saudi Arabia.
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| Keywords: |
Knowledge, Perception and Practice, misuse and abuse.
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| Year: |
2020
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| Initial page: |
45
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| Final page: |
52
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v28.n28.2020.07_Royes_pgs_46_52.pdf |
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| Author (s): |
TIMOSHIN, Anton; MITIN, Nikolay; OLEYNIKOV, Alexander; TIMOSHINA, Maria; MITINA, Evgeniya
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| Title: |
CLINICAL AND LABORATORY TESTING OF A NEW MODIFICATION OF TWO-LAYER "SILEP" DENTURES USED IN PROSTHETIC DENTISTRY |
| Abstract: |
Dentistry is a part of medicine, where various polymer materials were used for the first time. Many factors forced researchers to find more stable, versatile, and hygienic materials for the manufacture of dental products. It is important to note that the search for the ideal polymer dental material is still ongoing. This is because modern polymers, in some cases, do not meet the specified requirements for chemical, physical, strength, and elasticproperties. Based on the data on the method of creating and using silicone material for the base of the removable prosthesis "Gossil", an improved silicone material for two-layer dentures "Silep" was developed, as well as a special primer for better connection of the lining with the rigid acrylic base of the prosthesis. To evaluate the most suitable compound, materials were tested for several parameters, such as tensile strength, elongation, and shore hardness. In addition to selecting a suitable material for modification, the selection and testing of an adhesive that allows the chemical bonding of the acrylate surface to the siloxane surface were carried out.
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| Keywords: |
GosSil, SilEP, polymeric material, prosthetic dentistry.
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| Year: |
2020
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| Initial page: |
53
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| Final page: |
62
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v28.n28.2020.08_TIMOSHIN_pgs_53_62.pdf |
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