Harutyunyan A.,Armenian National Agrarian University
Vitis - Journal of Grapevine Research | Year: 2015
Factors affecting successful establishment in vitro, rapid proliferation, rooting and acclimatization of grapevine seedless cultivation 'Parvana' were studied. A treatment combination of 2.0 % calcium hypochlorite for 7 minutes plus 70 % ethanol for 3 minutes was found to be effective with 75.0 % of aseptic culture establishment in vitro. The highest number of new microshoots (4.5) was obtained in a culture medium (Gambourg's B5 modification) supplemented with 0.6 mg·L-1 BAP + 0.2 mg·L-1 KIN + 0.5 mg·L-1 GA3. Presence of GA3 in combination with BAP and KIN promoted elongation of shoots. A concentration of 0.4 mg/l IAA in half strength of MS (Murashige and Skoog) proved to be the best for rooting (84.4 % root induction, 4.66 roots with 7.9 cm length). In vitro rooted plantlets were successfully acclimatized, with 82.2 % survival rate in plastic pots containing garden soil, sand and peat moss(1:1:1). In this study an efficient micro propagation technique of grapevine seedless cultivar 'Parvana' was successfully achieved through lateral bud culture. Such a technique would be useful for large scale plant production and in vitro conservation.
Shirani M.,Armenian National Agrarian University |
Mohammadi-Ghehsareh A.,Islamic Azad University at Khorasgan
Advances in Environmental Biology | Year: 2013
The experiment was conducted as factorial in a completely randomized block design with 27 treatments and 4 replications under greenhouse conditions. Treatments included three sizes (S1= <0.5, S2= 0.5-1 and S3=1-2 cm), three composting times (C1=0, C2=3 and C3=6 months) of date palm waste and three irrigation levels (I1 =60% I3, I2= 80% I3 and I3=100%). During cultivation, the Papadopolus formula was used as fertigation solution. K, EC, pH, TA and vitamin C in tomato fruits differed significantly depending on composting time, particle size and irrigation level (P< 0.05). The highest amounts of K, EC, pH, TA and vitamin C in tomato fruit indicated that culture media 6 months composted, size 0.5-1 cm and irrigation 100% increased quality parameters of tomato fruit more than the other treatments. The result of this research showed that the characteristics of the growing media, as well as the growing techniques used (fertigation and irrigation levels), determine the quality of the tomato fruits that were produced.
PubMed | Armenian National Academy of Sciences, Tauride Agrotechnology State University, Kaunas T. Ivanauskas Zoological Museum, Armenian National Agrarian University and 11 more.
Type: Journal Article | Journal: PloS one | Year: 2015
In the first continent-wide study of the golden jackal (Canis aureus), we characterised its population genetic structure and attempted to identify the origin of European populations. This provided a unique insight into genetic characteristics of a native carnivore population with rapid large-scale expansion. We analysed 15 microsatellite markers and a 406 base-pair fragment of the mitochondrial control region. Bayesian-based and principal components methods were applied to evaluate whether the geographical grouping of samples corresponded with genetic groups. Our analysis revealed low levels of genetic diversity, reflecting the unique history of the golden jackal among Europes native carnivores. The results suggest ongoing gene flow between south-eastern Europe and the Caucasus, with both contributing to the Baltic population, which appeared only recently. The population from the Peloponnese Peninsula in southern Greece forms a common genetic cluster with samples from south-eastern Europe (K approach in STRUCTURE, Principal Components Analysis [PCA]), although the results based on BAPS and the estimated likelihood in STRUCTURE indicate that Peloponnesian jackals may represent a distinct population. Moreover, analyses of population structure also suggest either genetic distinctiveness of the island population from Samos near the coast of Asia Minor (BAPS, most STRUCTURE, PCA), or possibly its connection with the Caucasus population (one analysis in STRUCTURE). We speculate from our results that ancient Mediterranean jackal populations have persisted to the present day, and have merged with jackals colonising from Asia. These data also suggest that new populations of the golden jackal may be founded by long-distance dispersal, and thus should not be treated as an invasive alien species, i.e. an organism that is non-native to an ecosystem, and which may cause economic or environmental harm or adversely affect human health. These insights into the genetic structure and ancestry of Baltic jackals have important implications for management and conservation of jackals in Europe. The golden jackal is listed as an Annex V species in the EU Habitats Directive and as such, considering also the results presented here, should be legally protected in all EU member states.
PubMed | 11 Health, Armenian National Agrarian University, Rutgers University and Kyorin University
Type: | Journal: Letters in applied microbiology | Year: 2017
Previously, we reported a positive effect the probiotic formulation, Lactobacillus acidophillus INMIA 9602 Er-2 strain 317/402 (Narine strain), had on the blood characteristics of patients with familial Mediterranean fever disease (FMF). The aim of this investigation was to evaluate the effect of the Narine probiotic on growth characteristics in the predominant commensal Escherichia coli isolates from the gut microbiota in FMF positive study participants. Bacterial growth of 192 prevalent commensal E. coli isolates found in the volunteer participants guts were evaluated using Verhulsts logistic function. This study showed that the duration of the preparatory growth phase for the E. coli isolates collected from FMF positive volunteers was significantly shorter, while the duration of the logarithmic growth phase was significantly longer (P < 0.03) than of the isolates collected from healthy participants. The Narine probiotic formulation caused a significant extension (P < 0.001) of the preparatory growth phase in the commensal E. coli isolated from FMF subjects a month after the Narine probiotic administration was terminated. The data suggest that the mathematical model characterizes the growth of commensal E. coli isolates from FMF positive participants and it can be useful in a decision-making process on the practical use of probiotics during FMF. This article is protected by copyright. All rights reserved.
Rahmani M.,University of Tehran |
Dehghan-Banadaky M.,University of Tehran |
Kamalyan R.,Armenian National Agrarian University
Animal Production Science | Year: 2015
Twenty-four early-lactation primiparous and multiparous Holstein cows, beginning 5 weeks postpartum, were used for 4 weeks to investigate the effects of feeding rumen-protected choline (RPC) or vitamin E on milk yield, dry matter intake (DMI), blood metabolites and plasma enzymes. Cows were randomly assigned to one of the following treatments: no supplement (control), 90 g/day of RPC, or 4400 IU/day of vitamin E. Treatments did not affect milk yield, DMI, plasma glucose, non-esterified fatty acids, blood urea nitrogen, aspartate aminotransferase or total bilirubin, whereas feeding RPC affected cholesterol, plasma albumin, and alkaline phosphatase (ALP). Feeding vitamin E affected triglyceride, cholesterol, β-hydroxy butyric acid, gamma-glutamyl transferase and alanine aminotransferase, and highly affected plasma albumin and ALP. There was a tendency for vitamin E supplementation to increase plasma total protein concentration. The results of this study suggest that supplemental vitamin E may improve liver function in dairy cows in early lactation. © 2015 CSIRO.
Gevorgyan A.H.,Armenian National Academy of Sciences |
Gevorgyan A.H.,Yerevan State University |
Harutyunyan M.Z.,Yerevan State University |
Matinyan G.K.,Armenian National Agrarian University |
Mkhitaryan S.A.,Yerevan State University
Journal of Physics: Conference Series | Year: 2014
We calculated the photonic density of states (PDS) of the eigen polarizations in the system composed of a stack of layers of a cholesteric liquid crystal and an isotropic medium. The reflection spectra and PDS peculiarities, as well as the peculiarities of absorption and emittance were investigated. We obtained the dependences of the PDS as a function of parameters characterizing absorption and gain. It was shown that the subject system can be used in lasers for obtaining low threshold lasers with the emittance wavelength tunable in wide ranges. The system also can work as a multi-position trigger. © Published under licence by IOP Publishing Ltd.
Harutyunyan M.Z.,Yerevan State University |
Gevorgyan A.H.,Yerevan State University |
Matinyan G.K.,Armenian National Agrarian University
Optics and Spectroscopy (English translation of Optika i Spektroskopiya) | Year: 2013
Optical properties of a stack consisting of layers of a cholesteric liquid crystal (CLC) and an iso-tropic medium are investigated. The problem is solved using the modified Ambartsumyan layer-summation method. Particular features of reflectance spectra of this system are studied. It is shown that, in contrast to a single CLC layer, this system exhibits multiple photonic band gaps. There are two types of photonic band gaps: selective and nonselective with respect to polarization of the incident light. It is shown that eigenpolarizations in the system generally coincide with quasi-orthogonal quasi-circular polarizations, except for regions that are selective with respect to polarization of the diffractive reflection. It is shown that, for an even number of layers, the system under consideration is nonreciprocal and can function as an optical diode. The influence of thickness of CLC sublayers, angle of incidence, local dielectric anisotropy of CLC layers, refractive indices and thicknesses of layers of an isotropic media on reflectance spectra and other optical characteristics of the system is investigated. © Pleiades Publishing, Ltd., 2013.
Yezekyan T.,Armenian National Agrarian University |
Olt J.,Estonian University of Life Sciences
Engineering for Rural Development | Year: 2016
Vineyard floor management is a mandatory agricultural method for cultivating this kind of crop. In order to develop a strong root system and the portion of the plant that is above the ground, the soil must contain not only the required nutrients, but it should also be sufficiently humid, well-aerated, and have good thermal conductivity. The soil must be free from weeds that compete with grapevines for nutrients and moisture and aggravate the thermal conditions of the soil by shading it. The means for weed control depend on the soil and weather conditions, the thickness of weed vegetation, the irrigation system, and whether there is an underlying principle of using chemical agents for fighting weeds. In this article we considered widespread methods and techniques for weed control, improving the structure of soil and the methods of cultivating the areas between the plants in the vineyards, the comparison and justification of such methods from the financial perspective, and also the provision of necessary agrotechnical parameters of cultivating this kind of crop. The conducted comparative analysis has shown that the climate, anatomic and physiological peculiarities of grape varieties cultivated in Armenia are an important aspect that is being taken into consideration in developed countries upon choosing the machines for cultivating the areas between the plants in the vineyards. The purpose of this article is to develop to the vertical inter-row tiller of vineyards developed at the Armenian National Agrarian University (ANAU) an alternative variant for rocky soils and without power drive, or, in other words, with the principle of free-active spin-harrow for the inter-tillage of plant rows.
Sajadifar S.,Armenian National Agrarian University |
Miranzadeh H.,University of Applied Science and Technology of Iran
International Journal of Poultry Science | Year: 2013
In this study experimental treatments were as follows: broilers fed with 40 mg/kg Zn (A), broilers fed with 40 mg/kg Zn and vaccinated against coccidiosis (B), broilers fed with 120 mg/kg Zn (C),broilers fed with 120 mg/kg Zn and vaccinated against coccidiosis (D), broilers fed with 200 mg/kg Zn (E), broilers fed with 200 mg/kg Zn and vaccinated against coccidiosis (F). Average body weight gain, average daily feed intake and feed conversion ratio were obtained on d 21 and 42. At 2, 22, 32, 42 days of age, the blood serums were tested for antibody titer against Newcastle disease vaccination, using the standard Haemagglutination Inhibition test. On day 42 total protein, albumin, globulin (by an automated analyzer), weights of spleen and bursa of fabricius (on a relative live weight basis) and total leukocytes (using a hemocytometer) were measured. No dietary treatment significantly altered average daily feed intake, body weight gain and feed conversion ratio at days 21 and 42. The highest weights of spleen and bursa of fabrecius were observed at the combination of highest level of zinc and coccidiosis vaccine. At 32 d, treatment D and at 42 d, treatments D, E and F had the highest antibody titer against Newcastle disease vaccination. It is concluded that the treatments B, C, D, E and F showed significant (p<0.05) increase in white blood cell count as compare to control group (treatment A). Treatment F significantly improved total protein and albumin as compare to treatment A (p<0.05). Additional levels of zinc could be considered as natural promoter to increase different aspects of immune system without any harmful effect on performance traits. © Asian Network for Scientific Information, 2013.
Avetisyan S.,Armenian National Agrarian University |
Avetisyan A.,Armenian National Agrarian University
Acta Horticulturae | Year: 2014
The article touches upon the development trends of vegetable growing during the last two decades in RA and shows that vegetable growing is one of the most important and intensively developing branches of agriculture. Vegetable crops used to make 4% of the total crops on the eve of agrarian reforms (1990), whereas the rate was 8.7% in 2011. In the same period production volume doubled, increasing from 389.7 to 789.3 thousand tons. By the way, production growth owes mostly to intensive factors, as crop yield has increased by 46%. Nevertheless, our studies show, that the production development potential of the Republic's vegetable growing sector is not fully utilized. The sector has a number of main issues and upon solving those issues vegetable growing will become one of the most profitable agricultural sectors and will contribute to the income increase of the farmers and the reduction of poverty. In particular, the following issues have been discussed: - Promotion of innovation development in the field of vegetable growing, namely, improvement of selection and seed breeding using modern technologies, upgrade of sorts and cultivars in line with the market demand; - Targeted state support for the establishment of marketing logistic support for fresh and processed vegetable products; - Improvement of vegetable growing system and the increase in the share of plants ensuring high added value; - Optimal distribution of vegetable growing in marzes and adoption of beneficial organizational-economic conditions for diversification; - Development of legal-contractual system for long-term cooperation among vegetable growing farmers, processing and exporting companies. - The solution of the stated, though not all the existing issues will be an incentive for the efficient development of the fields of vegetable growing and food processing.