128 research outputs found
Processes and conditions influencing phytoplankton growth and bloom iniation in a macrotidal estuary, Southampton Water
No full textEThOS - Electronic Theses Online ServiceGBUnited Kingdo
Effect of calcium hydroxide and chlorhexidine medicaments on the apical seal
No full textIntroduction: Leakage of the root canal system is an importent consideration when placing an intracanal medicament. The aim of this in vitro study was to compare the effect of calcium hydroxide and 1% chlorhexidine gel as intracanal medicaments on tooth apical seal. Materials and Methods: Seventy extracted, single-rooted maxillary anterior teeth were divided into the three experimental groups (n=20). All root canals were instrumented with step-back technique and divided into three groups. Group 1 had root canal dressing with calcium hydroxide; group 2 had root canal dressing with 1% chlorhexidine gel and group 3, did not receive a dressing. The roots were incubated in 100% humidity at 37°C for 7 days. After removing the dressings, all canals of the experimental groups were obturated using a cold lateral condensation technique. The root surfaces of all specimens were coated with two layers of nail varnish, except for the 2 mm surrounding the apical foramen. Apical sealing ability was assessed by dye leakage method and the specimens were examined under a stereo-microscope. Dye penetrations were measured and analyzed using ANOVA and post-hoc Tukey test. Results: Calcium hydroxide group had the least frequency of apical leakage at 2 mm level (0.46±0.40 mm), whilst chlorhexidine group showed the greatest apical leakage (0.86±0.42 mm). There was statistical difference between group 1 and 2 (P0.05). Conclusion: Intracanal calcium hydroxide medicament may decrease apical leakage of gutta-percha root fillings when AH26 sealer is used; chlorhexidine may increase the leakage
Growth Response of Aboveground and Belowground of Eustoma grandiflorum to Elevated Co2 in Hydroponic Culture
No full textIntroduction: One of the climate change sign is variation in greenhouse gases in the Earth's atmosphere. Carbon dioxide is the most important greenhouse gas that is released into the atmosphere by humans. It is expected that addition of carbon dioxide could effect the energy balance and global climate. Climate change is effective on agricultural productions. It is clear that different plants have different responses to Co2 variation. These responses are consisting of yield, growth characteristic and variation in root/shoot ratio of plants. On the other hand, using growing media are expanding for plants because of their advantages such as plants nutrient control, reducing the incidence of diseases and pests and increasing the quantity and quality rather than soil cultivation. Properties of various materials as substrates influence directly or indirectly on plant growth and crop production., Hydroponic method can be considered as one of the important methods to optimize water use in agriculture, especially in many countries are located in arid and semi-arid regions that have water crisis. Lisianthus is one of the most beautiful flowers with folded petals in white, blue and purple. I-ts scientific name is Eustoma grandiflorum from the family of Gentianaceae and native to North America. It has variety of annual, biennial or short-lived perennial. The aim of this study was to explore the effect of Co2 enrichment on growth response of aboveground and belowground of Eustoma grandiflorum under increasing of Co2 greenhouse gases in hydroponic culture.
Materials and Methods: The experiment was done as a split-plot based on completely randomized experimental design with three replications at greenhouse of Ferdowsi University of Mashhad. The treatments were consists of three concentrations of carbon dioxide (380 as controls, 750 and 1050 ppm) as main plots and two cultivars Yodel white and GCREC-blue as subplots. Some characteristic such as plant height, internode length, root volume, root area, root and shoot dry weight were measured. Data were analyzed by JMP software Version 8 using analysis of variance (ANOVA) and significant differences between means were determined by using LSD test at P < 0.05.
Results and Discussion: The results of analysis of variance indicated that the effect of Co2 treatment was significant (
Experimental Investigation of Unsaturated Silt-Sand Soil Permeability
No full textThe permeability of unsaturated silt-sand soil is important in many geotechnical and geoenvironmental challenges. Therefore, an appropriate method to evaluate silt-sand soil permeability is important, particularly in Iran where it received little consideration. In this in vitro research, different amounts of fine silt were evaluated on behavior of an unsaturated silt-sand soil with different grain size distribution using a new modified triaxial apparatus. Permeability was measured against matric suction and volumetric water content, and the results are compared against experimental models. The results indicated that the behavior of unsaturated sandy soil permeability could be determined as a function of matric suction, soil void size, and percentage of fine aggregate. Furthermore, the results appeared to imply that an increase of fine contents reduced the permeability, specifically at higher values of suction. This trend for the reduction of soil permeability was related to the increase in the amount of fine contents
Photosensitization of phthalocyanine for singlet oxygen generation in photodynamic therapy applications
No full textIn this work, phthalocyanine and its OCH3 derivatives were investigated to see their photosensitization characteristics for producing singlet molecular oxygen, which is important in photodynamic therapy type-II. All structures were first optimized to achieve the minimized energy 3D models Subsequently, they were prepared for the photosensitization investigations. All the experiments were conducted based on the density functional theory calculations. The energy absorption and emission observed between the occupied and unoccupied molecular orbitals based on the required energy for excitation and the corresponding energy of emission. The results indicated that the OCH3 models could be expected to be safer than the original phthalocyanin by their required energy at longer wavelengths. The ratio of singlet molecular oxygen generation was found to be 1:1 for each of the OCH3 derivatives. © 2021 Sami Publishing Company. All rights reserved
Application of Zr-MOFs based copper complex in synthesis of pyrazolo[3, 4-b]pyridine-5-carbonitriles via anomeric-based oxidation
No full textAbstract In this research article, Zr-MOFs based copper complex as a novel heterogeneous and porous catalyst was designed and prepared. The structure of catalyst has verified by various techniques such as FT-IR, XRD, SEM, N 2 adsorption–desorption isotherms (BET), EDS, SEM-elemental mapping, TG and DTG analysis. UiO-66-NH2/TCT/2-amino-Py@Cu(OAc)2 was used as an efficient catalyst in the synthesis of pyrazolo[3,4-b]pyridine-5-carbonitrile derivatives. The aromatization of titled molecules is performed via a cooperative vinylogous anomeric-based oxidation both under air and inert atmospheres. The unique properties of the presented method are short reaction time, high yield, reusability of catalyst, synthesis of desired product under mild and green condition
Therapeutic Effects of Green Tea on Nonalcoholic Fatty Liver Disease in 10-16-Year-Old Children
No full textIntroduction: Nonalcoholic Fatty Liver Disease (NAFLD) is characterised by fat accumulation in the liver. Treatment of NAFLD in children is an important issue but the options are limited. Green tea has antioxidant and anti-hyperlipidemic effects but studies; on the effect of green tea in children are limited.
Aim: To investigate effect of green tea on NAFLD in children.
Materials and Methods: In this study. 52 children aged 10-16 years with NAFLD were divided into two groups of 26 each: Intervention and control. For both groups, modification of diet and intensification of physical activity were prescribed for three months. Intervention group was also treated with green tea tablets. Sonography and measurements of liver enzymes {Alanine Aminotransferase (ALT) and Aspartate Aminotransferase (AST)}, lipid profile and Body Mass Index (BMI) were conducted before and after the intervention. The data were analysed by the Statistical Package for the Social Sciences (SPSS) version 19.0 using ANCOVA.
Results: After treatment with green tea, fatty liver grade decreased significantly in the intervention group compared to control group (p<0.0001). In addition, this treatment caused significant decrease in ALT, AST, and triglyceride levels and significant increase in High-Density Lipoprotein (HDL) level (p<0.05), but Low-Density Lipoprotein (LDL) level did not decrease significantly in the intervention group compared to control.
Conclusion: Oral prescription of green tea was effective in improving fatty liver grade, decreasing hepatic fat accumulation and improving liver function, weight loss and reducing ALT and AST without any side effects. These effects can be due to green tea compounds such as polyphenols especially catechin and antioxidant and anti-hyperlipidemic effects.
Keywords
Author Keywords:Alanine aminotransferase; Aspartate aminotransferase; Green tea extract; Nonalcoholic steatohepatiti
Functionalization of (
No full textDensity functional theory (DFT) calculations were performed to investigate stabilities and properties for uracil (U)-functionalized carbon nanotubes (CNTs). To this aim, the optimized molecular properties were evaluated for (n, 0) models of CNTs (n = 3–16) in the original and U-functionalized forms. The results indicated that the dipole moments and energy gaps were independent of tubular diameters whereas the binding energies showed that the U-functionalization could be better achieved for n = 8–11 curvatures of (n, 0) CNTs. Further studies based on the evaluated atomic-scale properties, including quadrupole coupling constants (CQ), indicated that the electronic properties of atoms could detect the effects of diameters variations of (n, 0) CNTs, in which the effects were very much significant for the atoms around the U-functionalization regions. Finally, the achieved results of singular U, original CNTs, and CNT-U hybrids were compared to each other to demonstrate the stabilities and properties for the U-functionalized (n, 0) CNTs
Study on some blood immunological indices of the juvenile Persian sturgeon, Acipenser persicus caught from depths of 20 to 100 meters in the coasts of the Mazandaran province
No full textIn this study, a total of 60 juvenile Acipenser persicus (mean weight 410±267.6, mean length 39.6±19.6
cm and 1 - 2 year old) were captured by trawling method at depths of 20 to 100 meters in the Mazandran
province via 7 times surveys during 2009 – 2012, and studied immunologically. Results showed that the
mean of red blood cells (RBC) and white blood cells (WBC) were 585000 ± 151000 and 30300 ± 3200
per mm3
of blood, respectively. Mean percentage of lymphocyte, monocyte, neutrophile and eozynophile
were 83.1 ± 12, 2.9 ± 2, 8.3 ± 6.6 and 5.6 ± 3.2 %, respectively. Mean concentration of Immunoglobin M
(IgM) in blood serum was 25.6 ± 8.7 mg/dl. Samples showed no significant difference in length (P>0/05).
These results showed that the fish by less than the length classes were more sensitive to environmental
changes. For this reason, their immune indices improved. Therefore, any change in fish blood
immunological factors can lead to the secondary response.Publishe
NANOG Decoy Oligodeoxynucleotide–Encapsulated Niosomes Nanocarriers: A Promising Approach to Suppress the Metastatic Properties of U87 Human Glioblastoma Multiforme Cells
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