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Search Results: 1 - 10 of 191402 matches for " D Kahrizi "
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Effect of Nitrogen Levels, Plant Density and Climate on Yield Quantity and Quality in Cumin (Cuminum cyminum L.) Under the Conditions of Iran
K. Azizi,D. Kahrizi
Asian Journal of Plant Sciences , 2008,
Abstract: An experiment was conducted to study the effects of nitrogen fertilizer (N) (Urea 46%) and plant density (D) on the growth, seed yield, quantity and quality of seed essential oil of cumin (Cuminum cyminum L.) under the climatic conditions (L) of Lorestan Province (Poldokhtar, Khoramabad and Azna as tropical, temperate and cold regions, respectively) of Iran. Nitrogen as main factor (0, 2.5, 5.0 and 10.0 g m-2 and plant density as subsidiary factor (80, 120 and 160 plants m-2) were applied. The results showed that the highest umbel number per plant (42.34), seed number per umbel (9.78) and biological yield (2231) were related to the 2.5 g m-2 nitrogen fertilizer and 120 plants m-2 treatment (N2D2) and the highest harvest index (53.22%) obtained in N3L1 in this manner the highest value of variable include weight of thousand seeds (4.9 g) in N3L2 , seed yield (108.4 g m-2) and percentage of seed essential oil (2.89%) in N2L1 (p<0.01). Seed yield, yield components, biological yield, harvest index and percentage of seed essential oil were significantly affected by nitrogen fertilizer, plant density and climate. The highest those conducted to 2.5 g m-2 nitrogen fertilizer, 120 Plants m-2 plant density and Moderate climate. The most principle compounds composing the essential oil were cuminaldehyde (maximum 32.65%) and sum of P-mentha-1, 3-dien-7-al and P-mentha-1, 4-dien-7-al (maximum 55.42%). As a final point the temperate location was offered as the most suitable for cumin growing and production.
Genetic Variability of Some Morpho-Physiological Traits in Durum Wheat (Triticum turgidum var. Durum)
M. Maniee,D. Kahrizi,R. Mohammadi
Journal of Applied Sciences , 2009,
Abstract: The present investigation was carried out to (i) study some agro-physiologic traits and (ii) to estimate genetic variability parameters for the studied traits in 12 advanced durum wheat genotypes along with the two local checks (Zardak and Sardari). Statistical analysis showed significantly differences among the genotypes based on the studied traits. Genotypic and phenotypic coefficients of variations were high for number of tiller (NT), leaf dry weight (LDW), stem dry weight (STW), spike length (SL) and leaf area duration (LAD). Heritability estimates were high for plant height (PH), LDW and SL. High genetic gain was observed for grain yield, NT, peduncle length (PL), LDW, STW, spike dry weight (SPW), SL and LAD. Correlation analysis showed the grain yield was significantly correlated with traits LP, SPW, SL and relative growth rate (RGR). High heritability estimates associated with high genetic advance as percent mean (GG) were obtained in characters i.e., LDW, PH, SL and LAD, whereas low heritability and high genetic advance was observed for the grain yield.
Heritability and genetic gain of some morphophysiological variables of durum wheat (Triticum turgidum var. durum)
D Kahrizi, K Cheghamirza, M Kakaei, R Mohammadi, A Ebadi
African Journal of Biotechnology , 2010,
Abstract: The purpose of this work is to estimate genetic variability parameters and relationship among 11 agrophysiological traits studied on 18 experimental durum wheat and two checks under rainfed condition. The studied traits included the grain yield (YLD), plant height (PH), number of tiller per plant (NT), peduncle length (PL), flag length (FL), leaf dry weight (LDW), stem dry weight (STW), spike dry weight (SPW), spike height (SH), leaf area index (LAI), crop growth rate (CGR), relative growth rate (RGR), leaf area ratio (LAR) and net assimilation rate (NAR). Analysis of variance showed a significantly variation among genotypes for the characters PH, NT, PL, FL, LDW, STW, SPW, SH, LAR and NAR. High correlations were found among the PL, LDW, STW, SPW, LAR and NAR. Heritability estimates were high for PH, PL, LDW, STW and NAR. High genetic gains were observed for YLD, NT, PL, LDW, STW, SPW, LAR and NAR.
Evaluation of pathogencity and race classification of Xanthomonas oryzae pv. oryzae in guilan province-Iran  [PDF]
Maryam Khoshkdaman, Ali Akbar Ebadi, Danial Kahrizi
Agricultural Sciences (AS) , 2012, DOI: 10.4236/as.2012.34066
Abstract: To evaluation of pathogenicity and race classification of Xanthomonas oryzae pv. oryzae agent bacterial leaf blight of rice, 153 isolates of X. oryzae pv. oryzae were collected from different rice-growing cities of Guilan province – Iran. All of isolates were inoculated to assess the differential characteristics of 26 near isogenic rice lines containing a single resistance gene or two to five genes. Inoculation was done 21 days after sowing in the greenhouse. Scoring of inoculated plants was done 18 days after inoculation. The level of infection was not so clear among pyramiding lines, expect IRBB53 and IRBB61. Therefore, the pyramiding lines can not be used as differentials for pathogenicity evaluation of X. oryzae pv. oryzae The 12 rice lines with a single resistance gene were used further to establish a system of races classification of X. oryzae pv. oryzae IRBB14, IRBB21and IRBB7 were resistance to the most isolates. Whereas, IRBB1, IRBB2, IRBB4 and IRBB10 were susceptible to all isolates. Based on the interactions between the isolates X. oryzae pv. oryzae and the 12 near-isogenic rice lines, seven singlegene rice lines were chosen as differentials, and the 153 tested isolates were classified into four races. Except for cultivar types, different terrain, climate, period of rice planting and other factors may be associated with the population diversity and virulent variation of X. oryzae pv. oryzae.
Comparison of Acute Hormonal Responses between Resistance, Endurance and Endurance-Resistance Exercise in Healthy Young Men
Shoeib Rezaee,Sedighe kahrizi,Mehdi Hedayati
Physiology and Pharmacology , 2011,
Abstract: Introduction: This research was aimed at examining acute responses of hormones such as growth hormone (GH), total testosterone (TT), free testosterone (FT), free fatty acid (FFA) and cortisol to resistance (R), endurance (E) and endurance-resistance (ER) exercise. Methods: The participants of this study were 10 healthy young men. R protocol included bench press, lateral pull down, leg extension and leg curl. E protocol comprised of 30 minutes pedaling by cycle ergometer at 70% maximum heart rate. In the ER protocol, the participants first went through the E protocol and after an interval of 15 minutes they performed the R protocol. In the control group they did not do any exercise. Blood samples were collected before, immediately after and 15 minutes after exercise. Results: Results indicated that GH and FT were significantly increased after all 3 protocols (P<0.05). TT and FFA were significantly increased after R and E protocols, respectively (P<0.05). Comparison between groups indicated a significant difference between GH and FT. Cortisol was significantly decreased in the E and ER protocols and the control group (P<0.05) but it did not have a significant decrease in the R protocol. Conclusion: The E and ER protocols can increase GH with lower lactate and cortisol production, while the R protocol provides better anabolic environment for development and hypertrophy of muscle fiber because of higher stress, metabolic and hormonal responses. The increase of FFA after the E protocol was probably the cause of reduction of GH and TT secretion in the ER protocol.
Evaluation of Spinal Internal Loads and Lumbar Curvature under Holding Static Load at Different Trunk and Knee Positions
Sedighe Kahrizi,Mohammad Parnianpour,Seyyed Mohammad Firoozabadi,Anoshirvan Kasemnejad
Pakistan Journal of Biological Sciences , 2007,
Abstract: : A study was performed to investigate how different trunk and knee positions while holding static loads affect the lumbar curvature and internal loads on the lumbar spine at L4-L5. Ten healthy male subjects participated in this study. Two inclinometers were used to evaluate the curvature of lumbar spine, lordosis, while a 3D static biomechanical model was used to predict the spinal compression and shear forces at L4-L5. Eighteen static tasks while holding three level of load (0, 10 and 20 kg), two levels of knee position (45 and 180° of flexion) and three levels of trunk position (neutral, 15 and 30 degree of flexion) were simulated for 10 healthy male subjects. The results of this study revealed that the lordosis of lumbar spine changed to kyphosis with increasing weight of load from 0 to 20 kg in trunk flexion position (p<0.05), but in squatting position (45° knee full flexion) the higher load did not affect the curvature. The results of this study suggested, at a more flexed trunk and standing position with higher loads both external moment and internal loads increased significantly at L4-L5 level but with 45 knee flexion external moment and compression force increased and shear force decreased significantly (p<0.05). Subjects made more effort to maintain stability of the body in squat position. The highest external moment and compression force were computed at flexed knee and trunk position with highest loads. Hence holding weight in this position must be avoided by implementing ergonomic change to the workplace.
Evaluation of The Acute Hormonal Responses To Concentric, Eccentric And Concentric_ Eccentric Muscle Actions in Healthy Young Men
Behnam Sedghi,Seddigheh Kahrizi,HmidReza Zakeri,Kobra Omidfar
Physiology and Pharmacology , 2009,
Abstract: Evaluation of The Acute Hormonal Responses To Concentric, Eccentric And Concentric_ Eccentric Muscle Actions in Healthy Young Men Introduction: Resistance exercise is a potent stimulus for acute increase in the concentrations of circulating hormones such as Growth Hormone (GH) and Testosterone. Conventional resistance exercise is performed using sequential concentric (CON) and eccentric (ECC) contractions that is performed at a external constant load. The aim of this study, is determining hormonal and metabolic response to CON, ECC and CON-ECC muscle actions in order to develop appropriate resistance exercise protocols and equipment for both athletic populations and patients recovering from injury. In the present study, we have examined the endocrine system responses to six different upper and lower body exercise utilizing the CON, ECC and CON_ECC contractions. Methods: In this study, we examined acute hormonal responses of GH, TT & FT and cortisol of 10 young men who had experienced resistance exercises nonprofessionally. The exercise protocol included six resistance exercise which three of them were upper body and the other three were lower body exercises. The participants performed 3 contraction actions in 3 different days with at least one week interval and at the same time of the day. The exercise protocol included 4 sets in each exercise, every exercise was done 10 repetitions per set, and the resting time between exercises and sets was 90 seconds. CON and ECC actions performed at intensity of 80% CON 10-RM and 80 %( 120% CON 10-RM), respectively. Considering to the counterbalanced force design and on the calculations was done, the intensity of CON-ECC action was 88%CON 10-RM. Blood samples were collected before the exercise, immediately, 15, and 30 minutes after exercise session. Results: In the effect of CON, ECC and CON-ECC contraction actions GH increased, but after CON and CON-ECC trials increased significantly, only. In the effect of three actions, TT & FT increased significantly and following the three actions, cortisol decreased significantly. Conclusion: In despite of existence of significant increase in TT & FT acute response and significant decrease in cortisol response in the effect of CON, ECC and CON-ECC contraction actions, significant difference didn’t observe, that this issue demonstrating that the response of these hormones did not influence by type of contraction action. Also, between acute GH response related to these three actions, observed significant difference that demonstrating GH response depends on type of muscle action
Electrical Conductivity of Collapsed Multilayer Graphene Tubes  [PDF]
D. Mendoza
World Journal of Nano Science and Engineering (WJNSE) , 2012, DOI: 10.4236/wjnse.2012.22009
Abstract: Synthesis of multilayer graphene on copper wires by a chemical vapor deposition method is reported. After copper etching, the multilayer tube collapses forming stripes of graphitic films, their electrical conductance as a function of temperature indicate a semiconductor-like behavior. Using the multilayer graphene stripes, a cross junction is built and owing to its electrical behavior we propose that a tunneling process exists in the device.
Porous Carbon Grown by Chemical Vapor Deposition on Copper Substrates  [PDF]
D. Mendoza
Journal of Materials Science and Chemical Engineering (MSCE) , 2015, DOI: 10.4236/msce.2015.38003
Abstract: Amorphous porous carbon was synthesized by chemical vapor deposition on copper substrates. The average size of the pores is around 1.2 microns with some small pores decorating the big ones. Lamellar samples of this carbonaceous material can be separated from the copper support and may be useful as electrode due to its low electrical resistivity of the order of 0.4 Ωcm.
Application of Enzyme Extracted from Aloe vera Plant in Chemical Pretreatment of Cotton Knitted Textile to Reduce Pollution Load  [PDF]
D. Jothi
World Journal of Engineering and Technology (WJET) , 2015, DOI: 10.4236/wjet.2015.33B007
Abstract:

Nowadays, highly alkaline chemicals like caustic soda, soda ash, silicate, acetic acid and soaping agents are used for scouring to remove the non-cellulosic impurities from the cotton. Using 30 - 40 gm/Kg on weight of the fabric results in destruction of cotton structure. Intensive rinsing and more acid is needed for reutilization of cotton, which enlarges the volume of effluent. Furthermore, these hazards chemicals result in increase in COD, BOD and TDS in waste water. These chemicals also attack the cellulose leading to heavy strength loss and weight loss in the fabric. The net result is low quality control and polluted environment with high usage of energy, time, chemical and water. Aloe vera presents the finest commercial opportunity in various industrial sectors among the various plants. Also, most of the countries are gifted with the unique geographical features that are essential for cultivation of Aloe vera. Yet, none of the country has realized and reaped the full potential of such plants in various industrial applications. The reason is simple: lack of the requisite expertise in extraction of various enzymes present in aloe plant. Fortunately, the technology is now accessible to make use of enzyme in textile application. In this research an attempt has been made to make use of lipase enzyme extracted from aloe plant in textile chemical pre- treatment process. In the present research work, an attempt was made to develop bio scouring of 100% cotton knitted fabric with lipase enzyme extracted from Aloe deberena plant at various concentration (1%, 2% and 3%) at various temperature (40?C, 60?C and 70?C) for a period of 30 minutes, 60 minutes and 90 minutes. The properties of bio scoured fabrics are compared with these of conventional scoured one. Encouraging results in terms of dye uptake, dye levelness, wash fastness, light fastness and rubbing fastness are obtained in case of bio scouring fabric dyed with dark reactive colors. Further, it reduces volume of effluent as well as COD, TDS and pH. It saves a substantial thermal energy 50% and electrical energy 40%. Bio scouring waste water has 40% - 50% less COD and 60% less TDS as compared to conventional scouring waste water.

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