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Search Results: 1 - 10 of 461842 matches for " A. Tavili "
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Different Salts Effects on the Germination of Hordeum vulgare and Hordeum bulbosum
A. Tavili,M. Biniaz
Pakistan Journal of Nutrition , 2009,
Abstract: The germination responses of Hordeum ulgare seeds to saline stress caused by different salt types was studied. For this, 25 seeds of mentioned species were placed on filter paper in Petri dishes containing distilled water (control), 60, 120, 180, 240, 300, 360 and 420 mM. saline solution of NaCl, CaCl2 an KCl. The results indicated that saline levels effects were significant (P < 0.05) for seed germination percentage, seed germination velocity, mean time to germination, length of the stem and radicle and seed vigour. Seed germination decreased significantly by increasing salinity levels. Also, the results showed that H. vulgare is more tolerant than H. vulgare against salinity in germination stage.
Comparing Artemisia sieberi Besser and Artemisia scoparia Waldst and Kit. Elemental Content Grown on Crusted and Uncrusted Soils
A. Tavili,M. Jafari
Pakistan Journal of Nutrition , 2006,
Abstract: Biological soil crusts occur as assemblage of lichens, mosses, liverworts, and cyanobacteria. Lichens and mosses are the two important components of biological soil crusts, especially in arid and semiarid rangeland environments, where vascular plants vegetation is poor. Biological soil crusts contribute to a variety of ecological functions. The current study was carried out to compare two native shrubs elemental content. For this purpose, aerial parts of two native annual and perennial shrubs, Artemisia scoparia and A. sieberi, were collected from crusted and uncrusted soils in Qara Qir rangelands, next to Iran - Turkmenistan border line. N, P, K, Zn and Fe of the samples were measured. Factorial experiment based on Completely Randomized Design (CRD) was used for data analysis. Results showed that N, Fe and Zn content of samples collected from crusted and uncrusted sites were significantly different. Different treatments showed different behavior for each of mentioned elements. A. scoparia related to crusted and uncrusted soils contained the highest and lowest nitrogen percent, respectively. Zinc of A. sieberi and A. scoparia both collected from crusted site showed the greatest and lowest amount, respectively. This status was true for Fe changes in understudy treatments, too.
Comparing Some Properties of Crusted and Uncrusted Soils in Alagol Region of Iran
M. Jafari,A. Tavili,N. Zargham,Gh. A. Heshmati
Pakistan Journal of Nutrition , 2004,
Abstract: The current research was carried out to study effects of biological soil crusts (lichens and mosses) on some soil attributes. The study was carried out in rangelands of Alagol region, in north of Golestan province, Northern Iran. Survey area is located near Iran-Turkmenistan border. In this research, soil samples were taken from two crusted and adjacent uncrusted areas, at one site along 4 transects. Environmental factors, soil texture and vascular plants vegetation of two areas were similar, but due to livestock repeated trampling and wind and water erosion over the last years, there were not lichens and mosses in non-crusted points. Soil sampling was done along each of two transverse 300m transects. Laboratory analyses were done on soil samples from the upper soil layer (0-5 cm). Soil properties included organic C, K, Na, N, and P. Using t-test, above mentioned properties were compared in crusted and uncrusted soils. Results showed that P, N, and organic C were significantly different at depth 0-5 cm.
Soil-Vegetation Relationships in Hoz-e-Soltan Region of Qom Province, Iran
M. Jafari,M.A. Zare Chahouki,A. Tavili,H. Azarnivand
Pakistan Journal of Nutrition , 2003,
Abstract: The objective of this study was to find the effective soil variables on the distribution of vegetation types in Hoz-e-Soltan region. Study area was located in the saline region of Qom province. After delimitation the study area and determining plant types, sampling of soil and vegetation were done by randomized-systematic method. The area of quadrants was identified according to the minimal area procedure and the kind of plants distribution. Among vegetation properties, cover percentage and density were estimated quantitatively. Soil was sampled at 0-20 and 20-60 cm depths. Measured soil factors included texture, electrical conductivity (EC), acidity (pH), lime, soluble ions such as Ca2+, Mg2+, Na+, K+, Cl-, CO32- and HCO3-. In order to find the relationship between soil factors and vegetation properties and also to determine the most effective factors on the distribution of plant types, multivariate procedures, i.e., principal component analysis (PCA) and canonical correspondence analysis (CCA) were used. Results showed that there was a specific relationship between soil variables and plant types. The most effective factors on the separation of different communities were soil salinity and texture.
Treatment Induced Germination Improvement in Medicinal Species of Foeniculum vulgare Miller and Cuscuta epithymum(L.) L
Tavili, Ali,Asghar Farajollahi,Hossein Pouzesh,Eisa Bandak
Modern Applied Science , 2010, DOI: 10.5539/mas.v4n7p163
Abstract: The purpose of this study was to investigate the effects of different treatments on seed germination in two medicinal species (Foeniculum vulgare and Cuscuta epithymum). Both species are known to have low seed germination. An experiment was performed with 9 treatments and 4 replications in a completely randomized design. Treatments included KNO3 with concentrations of 0.1, 0.2 and 0.3 percent, immersion in boiling water for five and ten minutes, acetylsalicylic acid 50 and 100 mg L-1 and prechilling for 10 days. Tap water was used as the control. Our findings indicate that 0.1 KNO3 and 50 mg L-1 acetylsalicylic acid were the most effective treatments for improvement of seed germination percentage in both species.
Effects of Priming Techniques on Seed Germination and Early Growth Characteristics of Bromus tomentellus L. and Bromus inermis L.
Ali TAVILI,Salman ZARE,Seyed Amir MOOSAVI,Abdolghader ENAYATI
Notulae Scientia Biologicae , 2010,
Abstract: Seed priming is known as a seed treatment which improves seed performance under environmental conditions. Objective of this study was to evaluate the effects of different priming treatments on seed germination behaviour of two genotypes of Bromus under laboratory conditions to find out the most effective priming treatment. Seeds were treated with the following seed-soaking media: (i) unsoaked seed (control); (ii) hydropriming with distilled water for 4, 8, 12 and 16 hours, (iii) osmopriming treatments with PEG 6000 for Bromus tomentellus were -0.6, -0.8, -1.0 and -1.2 MPa osmotic potentials with duration of 12, 24 and 36 hours and for Bromus inermis osmoticpotentials were the same as B. tomentellus but duration of priming treatments was soaking seeds for 12, 24, 36 and 48 hours. Seeds of both genotypes were placed in liquid priming media at 25oC. Priming treatments significantly affected germination vigour of both genotypes. The response of both genotypes to different priming techniques approximately was similar. Osmopriming treatment (-0.6 MPa and 12 h) increased final germination percentage of B. tomentellus. Priming treatments increased coleoptile length significantly comparing to control but hydropriming for 4 h exhibited longer coleoptile than others. Higher vigour index was observed in hydropriming for 12 h but this difference was not significant with osmoprime treatment (12 h-0.6 Mpa). B. inermis produced more germinated seeds and vigourous seedlings than B. tomentellus but germination rate was higher in B. tomentellus.
The Spread of Infectious Disease on Network Using Neutrosophic Algebraic Structure  [PDF]
A. Zubairu, A. A. Ibrahim
Open Journal of Discrete Mathematics (OJDM) , 2017, DOI: 10.4236/ojdm.2017.72009
Abstract: Network theory and its associated techniques has tremendous impact in various discipline and research, from computer, engineering, architecture, humanities, social science to system biology. However in recent years epidemiology can be said to utilizes these potentials of network theory more than any other discipline. Graph which has been considered as the processor in network theory has a close relationship with epidemiology that dated as far back as early 1900 [1]. This is because the earliest models of infectious disease transfer were in a form of compartment which defines a graph even though adequate knowledge of mathematical computation and mechanistic behavior is scarce. This paper introduces a new type of disease propagation on network utilizing the potentials of neutrosophic algebraic group structures and graph theory.
A Comparative Investigation of Lead Sulfate and Lead Oxide Sulfate Study of Morphology and Thermal Decomposition  [PDF]
S. A. A. Sajadi
American Journal of Analytical Chemistry (AJAC) , 2011, DOI: 10.4236/ajac.2011.22024
Abstract: The compound lead oxide sulfate PbSO4.PbO was prepared in our laboratory. The Thermal behavior of PbSO4 was studied using techniques of Thermogravimetry under air atmosphere from 25 to 1200°C. The identity of both compounds was confirmed by XRD technique. Results obtained using both techniques support same decomposition stages for this compound. The electron microscopic investigations are made by SEM and TEM. The compound is characterized by XRD and the purity was determined by analytical Methods. Also a series of thermogravimetric analysis is made and the ideal condition is determined to convert this compound to pure lead oxide.
Metal ion-binding properties of L-glutamic acid and L-aspartic acid, a comparative investigation  [PDF]
S. A. A. Sajadi
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.22013
Abstract: A comparative research has been developed for acidity and stability constants of M(Glu)1, M(Asp)2 and M(Ttr)3 complexes, which have been determined by potentiometric pH titration. Depending on metal ion-binding properties, vital differences in building complex were observed. The present study indicates that in M(Ttr) com-plexes, metal ions are arranged to the carboxyl groups, but in M(Glu) and M(Asp), some metal ions are able to build chelate over amine groups. The results mentioned-above demonstrate that for some M(Glu) and M(Asp) complexes, the stability constants are also largely determined by the affinity of metal ions for amine group. This leads to a kind of selectivity of metal ions, and transfers them through building complexes accompanied with glutamate and aspartate. For heavy metal ions, this building complex helps the absorption and filtration of the blood plasma, and consequently, the excursion of heavy metal ions takes place. This is an important method in micro-dialysis. In this study the different as-pects of stabilization of metal ion complexes regarding to Irving-Williams sequence have been investigated.
Determining the Basaltic Sequence Using Seismic Reflection and Resistivity Methods  [PDF]
A. Alanezi, A. Qadrouh
Open Journal of Geology (OJG) , 2013, DOI: 10.4236/ojg.2013.32B004
Abstract:

This study was carried out in Harat Rahat (south of Almadinah Almonwarah) using seismic reflection and resistivity methods. The main objectives of this study are to determine the extent of the basaltic layer and to define the subsurface faults and fractures that could affect and control the groundwater movement in the study area. A 2D seismic profile was acquired and the result shows that the subsurface in the study area has a major fault. We obtained a well match when the seismic result was compared with drilled wells. As a complementary tool, the resistivity method was applied in order to detect the groundwater level. The results of the resistivity method showed that six distinct layers have been identified. The interpretation of these six layers show that the first three layers, the fourth layer, the fifth layer and the bottom of the section indicated various subsurface structures and lithologies; various basaltic layers, fractured basalt, weathered basement and fresh basaltic layers, respectively. It is obvious that the eventual success of geophysical surveys depend on the combination with other subsurface data sources in order to produce accurate maps.

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