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Search Results: 1 - 10 of 167689 matches for " E. Tafazoli "
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Possible Role of Cytokinins in Flower Induction in Strawberry
S. Eshghi,E. Tafazoli
American Journal of Plant Physiology , 2007,
Abstract: : During inductive conditions, biochemical or physiological changes are recognized. One possible change that might occur is hormone content. In this study, changes in endogenous cytokinins in the shoot tips, leaves and roots of strawberry plants (Fragaria x ananassa Duch cv. Kordestan) under flower bud inductive conditions were measured and compared with non-induced plants. Runner plants were potted and grown in non-inductive conditions (high temperature; long-day). Half of the plants were then put under inductive conditions (low temperature; short-day) for 3 weeks. Samples for cytokinin analysis were taken from induced and non-induced plants every 3 days during 3 weeks. Results indicated that free cytokinin in shoot tips of induced plants were significantly higher than in non-induced plants. Free cytokinin in shoot tips and leaves of induced plants increased from 3 to 12 days After the Start of the Short-day Treatment (DASST) and thereafter decreased. Bound cytokinin level in shoot tips of induced plants decreased from 3 to 12 DASST. Free and bound cytokinin in roots of induced plants decreased from 3 to 12 DASST and increased afterward. The results suggest that the changes in free cytokinin during the process of flower induction play an important role in flower induction in strawberries.
Reduction of Growth Period Prior to Budding in Lime (Citrus aurantifolia) Seedlings and Budtake by Use of Plant Growth Regulators and Pinching
S. Eshghi,E. Tafazoli
Journal of Science and Technology of Agriculture and Natural Resources , 2007,
Abstract: Today, the production of disease-free and identical rootstock seedling in protected environments is a common practice in citrus industry. The process is time consuming, laborious and expensive. Shortening the period to reach suitable size for budding results in the reduction of the costs. It is possible to shorten the period for budding in citrus seedlings through the application of growth regulators. As lime is used widely as a rootstock in Southern Iran, this research attempted to study the effect of paclobutrozol (PP333), ethephon and pinching following gibberellic acid (GA3) treatment on height, diameter and budtake of lime seedlings. To do the research, seedlings with 4-6 leaves were sprayed with 100 mg/L GA3. After GA3 treatment, uniform seedlings 50 cm height were selected, potted and sprayed with PP333 (500 and 1000 mg/L), ethephon (150 and 300 mg/L) or pinched. All treatments, compared with control, increased height, diameter and fresh weight of shoot significantly. GA3 alone caused internode elongation. The effect of all treatments on the number of node, fresh and dry weights of root was not significant. Ethephon reduced chlorophyll content of leaf. And ethephon (300 mg/L) and PP333 (1000 mg/L) reduced budtake percentage of lime seedlings.
Effect of Sodium Chloride on Lipoxygenase Activity, Hydrogen Peroxide Content and Lipid Peroxidation Rate in the Seedlings of Three Pistacia Rootstocks
M. Heidari,E. Tafazoli
Journal of Science and Technology of Agriculture and Natural Resources , 2005,
Abstract: One of the main criteria for salt tolerance is cell membrane stability under stress. Reactive oxygen species (ROS), activity of lipoxygenase (Lox) and lipid peroxidation are considered to be destructive to cell membrane under salt stress. In this study, the effects of 0, 75 and 150 mM NaCI, over a period of 14 days on the activity of lipoxygenease, the amount of hydrogen peroxide (H2O2) and malon dialdehyde (MDA. as a lipid peroxidation) in the leaves of Pistacia vera L. (cv. 'Qazvini' and wild 'Sarakhs' pistachio) and 'Mastic' (P. mutica F. & M.) were studied. The results indicated that by increasing salinity Lox activity increased in the leaves of all the three rootstocks. This activity reached a climax on the 7th day and then decreased on the 14th day. Among the three species, Mastic reached the highest amount of the Lox activity on the 14th day with the lowest amount of Lox reduction. The amounts of H2O2 in the leaves of all the three rootstocks increased, on the 14th day the highest amount of hydrogen peroxide was found in 'Mastic' and 'Sarakhs' after treating them with 150 mM NaCl. The amounts of MDA were also reached the highest level in all three rootstocks on the 7th and 14th days. The results also indicated the possibility of the use of lipid peroxidation index and Lox activity for selecting salt tolerant Pistacia rootstocks. More studies are needed for understanding the biochemical changes and enzyme activities in Pistacia rootstocks under salt stress.
Effects of Gibberellic Acid (GA3), Naphtalin Acetic Acid (NAA), Ethephon and Urea on Alternate Bearing Control in Kinnow Mandarin (Citrus reticulata Blanco)
M. J. Moghbeli Hanzaii,E. Tafazoli
Journal of Science and Technology of Agriculture and Natural Resources , 2002,
Abstract: Alternate bearing is a key factor in limiting citrus production. Chemical controls have proved to be the most effective solution to this problem. Two different experiments were conducted to study the effects of different growth regulators (GA3, NAA, Ethephon) and urea on alternate bearing control in Kinnow mandarin (Citrus reticulata). In the first experiment, GA3 at concentrations of 0, 25, 50, 75 and 100 mgl-1 were applied 3 times during late autumn and early winter 1993 on off trees. Flowers reduced as a result of GA3 application in the following spring but increased in the second spring. Best results obtained with 50 and 75 mgl-1. In the 2nd experiment thinning agents: NAA (0, 100, 200 and 300 mgl-1), ethephon (0, 100, 200, 300 mgl-1) and urea (0, 4, 8 and 12%) were sprayed to the trees on on-year, when the fruitlets were about 0.75-1 cm in diameter. The results indicated that urea had no effect; however, both NAA and ethephon were effective on thinning of fruits and control of fruiting. Ethephon at 200 and 300 mgl-1, and NAA at 400 mgl-1 gave the best results.
Influence of Postharvest Vacuum Infiltration with Calcium on Chilling Injury, Firmness and Quality of Lisbon Lemon Fruit
M.R. Safizadeh,M. Rahemi,E. Tafazoli,Y. Emam
American Journal of Food Technology , 2007,
Abstract: The aim of present study to determine the effect of postharvest vacuum infiltration with CaCl2 on Chilling injury, firmness and quality of Lisbon lemons [Citrus limon (L.) Burm.] at the yellow-green state, were treated with CaCl2 solutions up to 7.5% (w/v) by normal vacuum infiltration (NVI, 15°C, -33 kPa, 10 min), or hot vacuum infiltration (HVI, 45°C, -33 kPa, 10 min) before storage at 1.5°C and 85-90% RH for 6 and 12 weeks and 1 additional week at 20°C. Vacuum infiltration maintained firmness best following 6 weeks, but reduction in the Chilling Injury (CI) index observed following 12 weeks of cold storage and additional week at 20°C. By both infiltration regimes, the different concentrations of CaCl2 only affected CI, weight loss and firmness of fruit, but did not alter other parameters. Among the treatments, NVI at 1.5% CaCl2 and hot water infiltration alone (45°C, -33 kPa, 10 min) were the most effective and reduced the severity of CI by 53.2 and 19.3%, respectively. The fruit treated with 7.5% CaCl2 by NVI and ≥4.5% CaCl2 by HVI showed significantly lower values of deformation (more firmness) than non-treated ones. Combination of CaCl2 and hot water (HVI) increased the efficiency of CaCl2 in terms of firmness retention, but had no additive effects in reduction of CI. As compared to NVI, HVI increased CI index and the rate of K+ leakage and decreased total soluble solids and acidity levels of fruit. A significant correlation was also found between CI index and each of other parameters. As CI increased, weight loss and ion leakage increased too, but ascorbic acid and acidity levels decreased. Similar trends were observed as the storage period advanced and CI increased.
Effect of Salinity on Shoot Concentration of Trace Elements in Different Citrus Species
J A. Aboutalebi,E. Tafazoli,B. Kholdebarin,N. Karimian
Journal of Science and Technology of Agriculture and Natural Resources , 2006,
Abstract: The Effect of various NaCl levels on the shoot content of trace elements, in the seedlings of five citrus species namely: Bakraei (Citrus reteculata X C. limetta), Volkamer lemon(C. volkameriana), Sour orange(C. aurantium), Sweet lime (C. limetta) and Mexican lime(C. aurantifolia), were studied in a glasshouse, by a randomized complete block design with factorial arrangement and four replications. One-year old seedlings of each species were grown in the pots, containing native soil (pH=8.2) and irrigated with water supplemented with 0(control), 20, 40 and 60 mM NaCl. At the end of experiment, the amount of Fe, Zn, Mn, Cu, Cl and B in shoots were determined. The amount of trace elements varied among the species even in the control plants (no salt). Salinity had different effects on the shoot content of trace elements. Salinity reduced Fe content in the shoot of all species except in Bakraii and sweet lime and increased the amount of Zn in the shoot of all species except in Bakraii. The Mn content was reduced in the all species but increased in sour orange. Salinity reduced the amount of Cu in the shoot of volkamerina but had no effect in the other species. The amount of Cl increased in the shoot of all species with salinity. Boron content in the shoot of all species except in sour orange, increased with low salinity level but decreased with increased salinity levels. However in sour orange, salinity in the all levels decreased the amount of B in the shoot of seedlings.
Performance Improvement of GPS GDOP Approximation Using Recurrent Wavelet Neural Network  [PDF]
S. Tafazoli, M. R. Mosavi
Journal of Geographic Information System (JGIS) , 2011, DOI: 10.4236/jgis.2011.34029
Abstract: One of the most important factors affecting the precision of the performance of a GPS receiver is the relative positioning of satellites to each other. Therefore, it is essential to choose appropriate accessible satellites utilized in the calculation of GPS positions. Optimal subsets of satellites are determined using the least value of their Geometric Dilution of Precision (GDOP). The most correct method of calculating GPS GDOP uses inverse matrix for all combinations and selecting the lowest ones. However, the inverse matrix method, especially when there are so many satellites, imposes a huge calculation load on the processor of the GPS navigator. In this paper, the rapid and precise calculation of GPS GDOP based on Recurrent Wavelet Neural Network (RWNN) has been introduced for selecting an optimal subset of satellites. The method of NNs provides a realistic calculation approach to determine GPS GDOP without any need to calculate inverse matrix.
Effects of Water Stress and Cycocel as a Growth Retardant on Growth of Two Olive Cultivars
H.R. Memari,E. Tafazoli,A. Kamgar-Haghighi,A. Hassanpour
Journal of Science and Technology of Agriculture and Natural Resources , 2011,
Abstract: Many experiments have been carried out to decrease the negative effect of drought stress and obtain suitable growth under water deficit conditions. Application of plant growth regulators (especially growth retardants) is one of the proposed methods. This study was conducted to investigate the effect of Cycocel application on growth of two olive cultivars (Shengeh and Roghani) under water stress condition. The design of experiment was completely randomized with six replications (Factorial arrangement). Treatments included irrigation intervals (2, 4, 6, 8 weeks) and Cycocel concentrations (0, 500,1000,2000,4000 mg per litter). Some indices such as height, chlorophyll, leaf area, root, and shoot weight (fresh and dry) were measured. Results indicated that interaction of C.C.C treatment and irrigation intervals on height of olive cultivars was not significant, probably due to the response of these cultivars to concentrations of C.C.C. Although drought stress decreased the number of leaves in both cultivars, the application of CCC (500 mg per litter) thwarted the adverse effects of drought stress. Cycocel increased chlorophyll content significantly (500 mg per litter in Roghani and Shengeh and 6 weeks irrigation interval). Cycocel application decreased leaf area, but in Shengeh cultivar increased leaf area in 6 week irrigation interval. Overall, the results indicated that the application of Cycocel with concentration of 500 mg per litter in 6 week irrigation intervals in both cultivars (Roghani and Shengeh) was the best treatment for controlling the adverse effects of drought. Also, results indicated that such changes were dependent on Cycocel concentration and drought level.
Kangaroo mother care for infantile colic: a randomized clinical trial
Reza Saeidi,Mahin Tafazoli,Mahbobeh Gholami Robatsangi
Tehran University Medical Journal , 2010,
Abstract: "n Normal 0 false false false EN-US X-NONE AR-SA MicrosoftInternetExplorer4 st1":*{behavior:url(#ieooui) } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:Arial; mso-bidi-theme-font:minor-bidi;} Background: Infantile colic has been defined as episodes of excessive and persistent crying without known medical cause. Kangaroo mother care is a new method for baby care with several advantages. A universally available and biologically sound method of care for all newborns, with three components: skin-to-skin contact, exclusive breastfeeding, support to the mother-infant dyad. This study designed for evaluating Kangaroo mother care on infantile colic. "n"nMethods: This study was a randomized controlled trial. From 1th may 2008 to 1 may 2009 a total of 70 children, aged 3-12 weeks with persistent colic symptoms were studied. The children were referred to Sheikh clinic, Mashhad, Iran, because of excessive crying. Normal mother-infant pairs were recruited at 3 to 12 weeks of age after obtaining baseline for two days. Subjects divided randomly to kangaroo care or conventional care group and mothers in both groups filled diary for seven days. "n"nResults: In the beginning of the study, the infants in kangaroo care group had 3.5 hr/d crying and after the intervention, it decreased to 1.7 hr/d, the difference were significant (p<0.05). But there were no difference in feeding duration between two groups (p=0.2). Awake and content (normal behavior) behaviors were significantly increased in the kangaroo care group (p=0.001). Sleep duration was significantly increased in the kangaroo care group (p=0.02)."n"nConclusions: Kangaroo care may be used as a simple and safe method for treatment of infantile colic.
Effects of Cluster Thinning and Cane Topping on Balanced Yield and Fruit Quality of Table Grape (Vitis vinifera L.) cv. Askari
B Kavoosi,S Eshghi,A Tafazoli
Journal of Science and Technology of Agriculture and Natural Resources , 2009,
Abstract: Overcroping, shading and short growing season can reduce the pool of carbohydrate reserves, and consequently reduce the quality of crop in grapevines. An experiment was conducted in order to study the effects of cluster number and different levels of cane topping on balanced yield and qualitative traits of table grape (Vitis vinifera L.) cv. Askari. The design of experiment was factorial in completely randomized blocks with four replications. Factors included cluster number (Control, 25, 30, 35, 40, 45 and 50 cluster per vine) and cane topping included (Control, removal 1/4, 1/3 and 1/2 length of shoot). Results showed that decreasing the number of cluster to 25-35 per vine, significantly increased %TSS, TSS/TA and pH but with increasing cluster number, these traits were significantly reduced. Thinning treatment to 25 cluster showed significant difference from the viewpoint of %TA compared with untreated control. Also topping treatment significantly increased %TSS, %TA, TSS/TA ratio and decreased % TA compared with untreated control. Reducing the cluster to 25-45 per vine significantly increased cluster weight, however, no significant difference was observed between control and 50 clusters per vine and/or 25 to 50 clusters. Yield per vine was reduced in all treatments in comparison with untreated control. However, no difference was shown between 25 to 35 and or 40 and 50 clusters per vine. According to the results obtained, cluster thinning combined with topping can be recommended for increasing fruit quality and balanced yield of Askari table grapes in cold climate of Cisakht region.
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