Sex steroids in the seminal fluid and milt quality indices in the endangered Caspian brown trout,Salmo trutta caspius     

Hamid Reza Jamalzadeh  Maryam Akhundian  Milad Kabir  Hossein Khara  Saeed Hajirezaee 《Aquaculture Research》2014,45(6):1090-1095

In this study, the relationships between the seminal fluid sex steroids sperm quality parameters (i.e. sperm motility and sperm production were investigated in the endangered Caspian brown trout. According to results, the variation of sex steroid concentrations was comparatively high. The seminal fluid levels of 17α‐Hydroxyprogesterone (OHP) had positive correlation with percentage and duration of sperm motility. Similar correlation was found between the seminal fluid concentration of testosterone (T) and estradiol‐17β (E2) with sperm concentration. As well as, there was no significant correlation between progesterone (P) with sperm quality indices. The significant correlation of some steroids i.e. OHP, T and E2 and sperm quality parameters of Caspian brown trout confirms the key role of these steroids in acquisition of the potential of motility during final stage of the maturation.  相似文献   

Trends in calving ages and calving intervals for Iranian Holsteins in Fars province,southern Iran   总被引：2，自引：2，他引：0  

Maryam Ansari-Lari  Maryam Rezagholi  Mahdie Reiszadeh 《Tropical animal health and production》2009,41(7):1283-1288

Purpose  

To determine trends in calving ages and calving interval as measures of reproductive performance in Iranian Holsteins in Fars province, southern Iran during 2000–2005.  相似文献   

Effects of Bacillus subtilis on the water quality,stress tolerance,digestive enzymes,growth performance,immune gene expression,and disease resistance of white shrimp (Litopenaeus vannamei) during the early hatchery period     

Mirbakhsh  Maryam  Mahjoub  Masoud  Afsharnasab  Mohammad  Kakoolaki  Shapoor  Sayyadi  Mostafa  Hosseinzadeh  Saeid 《Aquaculture International》2021,29(6):2489-2506

Aquaculture International - In the present study, the white shrimp, Litopenaeus vannamei, was supplemented with the probiotic Bacillus subtilis IS02 in order to improve the larval survival rate....  相似文献   

Physiological responses of great sturgeon (Huso huso) to different concentrations of 2-phenoxyethanol as an anesthetic     

Fardin Shaluei  Aliakbar Hedayati  Abdolreza Jahanbakhshi  Maryam Baghfalaki 《Fish physiology and biochemistry》2012,38(6):1627-1634

The objective of the study was to evaluate the efficacy of 2-phenoxyethanol (2-PE) as an anesthetic in great sturgeon under two experiments. First, fish were exposed to 0.1, 0.3, 0.5, 0.7 and 0.9?mL/L 2-PE, and time to induction (deep anesthesia) and recovery from anesthesia were measured. At concentration of 0.1?mL/L, 2-PE failed to induce deep anesthesia in fish, whereas at concentrations of 0.7 and 0.9?mL/L, all the fish were anaesthetized within 3?min of exposure. For assessing the impact of effective concentrations of 2-PE on physiological responses of great sturgeon, hematological indices, plasma metabolites, electrolytes, enzymes and cortisol levels were measured. The use of 2-PE induces a significant increase in RBC values at 0.3?mL/L concentration and a parallel increase in hemoglobin and hematocrit values. 2-PE anesthesia had no effect on WBC, MCV, MCH and MCHC levels when compared to control group. Serum glucose, cholesterol and cortisol levels were significantly high in 0.3 and 0.5?mL/L 2-PE. Moreover, AST levels were increased in fish exposed to the 0.3?mL/L 2-PE comparing with the control group (P?<?0.05). There were no significant differences in serum levels of total protein, triglycerides, ALP, ALT, Cl^?, Na⁺, K⁺, Ca²⁺ and Mg²⁺. In this study, alteration in hematological and serum biochemical indices was time-dependent. This study demonstrates that rapid induction of deep anesthesia with a relatively high concentration of 2-PE (0.7 and 0.9?mL/L) was associated with the lowest effects on the hematological and serum biochemical indices in great sturgeon and therefore would be recommended as eligible doses for hematological studies in this species.  相似文献   

Identifying Soil and Plant Nutrition Factors Affecting Yield in Irrigated Mature Pistachio Orchards     

Isa Esfandiarpour-Borujeni  Seyed Javad Hosseinifard  Hossein Shirani  Maryam Zeinadini  Ali Asghar Besalatpour 《Communications in Soil Science and Plant Analysis》2018,49(12):1474-1490

The main objective of this study was to evaluate the potential use of a hybrid Genetic Algorithm-Artificial Neural Network (GA–ANN) method for predicting pistachio yield and for identifying the determinant factors affecting pistachio yield in Rafsanjan region, Iran. A total of 142 pistachio orchards were selected randomly and soil samples were taken at three depths. Besides, water samples and leaves from branches without fruit were taken in each sampling point. Management information and pistachio yields were achieved by completing a questionnaire. Primarily, 58 variables affecting pistachio yield were measured, and then 26 out of them were selected by minimizing mean square error (MSE) using a feature selection (FS) method. The results showed that the accuracy of the method was acceptable. Furthermore, the sensitivity analysis showed that the main determinant features affecting the pistachio yield were the irrigation water amount, leaf phosphorus, soil soluble magnesium, electrical conductivity (EC), and leaf nitrogen.  相似文献   

Effects of forest harvesting on runoff and sediment characteristics in the Hyrcanian forests,northern Iran   总被引：1，自引：0，他引：1  

Maryam Etehadi Abari  Baris Majnounian  Arash Malekian  Meghdad Jourgholami 《European Journal of Forest Research》2017,136(2):375-386

Loss of canopy cover by forest harvesting generally increases the average surface runoff volume and sediment. Selective cutting (single and group selection method) is the most usual forest harvesting method in the Hyrcanian forests in the north of Iran. The purpose of this study is to find the effect of selective logging technique on the hydrological behavior of runoff and sediment in the Kheyrud forests located in northern Iran over 1 year. Four treatments were implemented: natural forest without harvesting (C), forest with selective harvesting (H) and area without canopy cover (WC) and skid trail (S). Three types of data were measured in each plot including soil chemical and physical properties, runoff and sediment load after each rainfall. The results indicate significant differences (P ≤ 0.05) in runoff generation and sediment production with respect to the treatments cover. The runoff in all treatments showed relatively similar response to rainfall, while the highest runoff and sediment were observed in skid trails, and the area without canopy cover (1.13 and 0.62 mm, and 1.2 and 0.51 g m^?2), averagely. In contrast, the natural forest without harvesting and the forest with selective harvesting treatments exhibited the lowest amounts of runoff (0.2 and 0.44 mm) and sediment (0.1 and 0.17 g m^?2), averagely. Implementation of low logging technique was useful to control the effects of logging on the runoff and sediment yield.  相似文献   

Temporal variation of total and DTPA-extractable heavy metal contents as influenced by sewage sludge and perlite in a calcareous soil     

Maryam Zahedifar  Somayeh Dehghani  Edris Gavili 《Archives of Agronomy and Soil Science》2017,63(1):136-149

Continuous application of sewage sludge (SS) as a source of organic matter, may increase available heavy metals (HMs) up to their critical levels. As a consequence their uptake by plants, risks of accumulation in food chain and groundwater pollution increases. To evaluate the effects of perlite and SS on total content and available fraction of iron (Fe), manganese (Mn), lead (Pb), copper (Cu), nickel (Ni), cadmium (Cd) and zinc (Zn) over 45 and 90 days a completely randomized pot experiment was conducted. Treatments consisted of SS (0, 2 and 4%) and combined SS and perlite levels (1:1, 1.5:0.5 and 0.5:1.5% SS:perlite). Mean available Fe, Ni, Cd, Mn and Zn fractions decreased over time by 7–27%, whereas, total contents did not change. Available HMs in SS-treated soils increased by 0.5–25%; whereas, only total Zn, Cu and Pb concentrations increased with SS application (although concentrations fall in the range of critical levels). The lowest (1.6 fold) and highest (22.1 fold) increases obtained for available Cu and Zn, respectively. Perlite could mitigate the adverse effect of high rate application of SS on amplification of HMs extractability. Therefore, their concomitant applications can be suggested considering the perlite durability and its positive effects on soil physical properties.  相似文献   

Metabolomic analysis of Ranunculus spp. as potential agents involved in the etiology of equine grass sickness     

Michl J  Modarai M  Edwards S  Heinrich M 《Journal of agricultural and food chemistry》2011,59(18):10388-10393

Identification of toxic or harmful agents continues to be a key goal in agricultural chemistry. This paper reports a metabolomic analysis of Ranunculus repens and related species, which were recently postulated to be cocausative agents in the etiology of equine grass sickness (EGS). Specifically, samples collected at EGS sites were compared with those from non-EGS sites. Furthermore, interspecific and seasonal variations and the species' response to edaphic and climatic factors were investigated. (1)H NMR spectroscopy in combination with multivariate data analysis was applied to the crude methanol extracts of the Ranunculus samples, as well as their chloroform fractions. Samples from EGS sites were significantly different from control samples. The metabolite composition varied greatly between different Ranunculus species. No significant changes could be observed between samples collected in different seasons. This work provides strong evidence that Ranunculus is involved in the etiology of EGS and has implications for agricultural management of pastures.  相似文献   

Screening drought-tolerant genotypes in bread wheat (Triticum aestivum L.) using different multivariate methods     

Roohollah Abdolshahi  Abdorahim Safarian  Maryam Nazari  Shahram Pourseyedi  Ghasem Mohamadi-Nejad 《Archives of Agronomy and Soil Science》2013,59(5):685-704

Wheat (Triticum aestivum L.) is one of the most widely cultivated crops in rainfed areas of Iran, where drought is the main limiting factor on yield. The object of this study was the identification of drought-tolerant genotypes in bread wheat. Forty bread wheat genotypes were tested in separate experiments under drought stress and normal conditions in two years (2009–2010 and 2010–2011). Nine drought-tolerance/susceptibility indices including stress susceptibility index (SSI), mean productivity (MP), tolerance (TOL), stress tolerance index (STI), geometric mean productivity (GMP), yield index (YI), yield stability index (YSI), linear regression coefficient (β) and drought response index (DRI) were determined. Simultanously applied factor analysis used two factors instead of nine indices in this study. Mahdavi was recognized as the most drought-tolerant genotype in both years based on factor analysis. In this study an equation was developed for estimating the Stress Tolerance Score (STS). The results of the equation were identical to those of factor analysis in both years. The equation was much easier to use than factor analysis and is suggested as a screening tool for the identification of drought-tolerant genotypes. In this study, Mahdavi was the most drought-tolerant genotype also corresponding to this equation.  相似文献   

Improvement of Antioxidant System and Decrease of Lignin by Nickel Treatment in Tea Plant     

Faezeh Ghanati  Maryam Rahmati Ishka 《Journal of plant nutrition》2013,36(9):1649-1661

The effect of nickel (Ni) on the activities of antioxidant enzymes was evaluated in suspension-cultured cells of tea (Camellia sinensis L. cv. ‘Yabukita’) and two-year-old rooted cuttings of tea (Camellia sinensis L. assamica × sinensis). Suspension-cultured cells were grown in B5 medium and treated with 40 μM of Ni for 24 h. Tea plants were grown in a modified Hoagland solution and treated for one week with 40 μM of Ni. The activities of superoxide dismutase, catalase, ascorbate peroxidase, and ionically wall-bound peroxidase of both Ni-treated tea cells and Ni-treated tea plants increased compared with those of control groups. The activities of soluble peroxidase and covalently wall-bound peroxidase, as well as the lignin content of both tea cells and tea plants, decreased under Ni treatment. Thus it seems that Ni may have beneficial effects on tea plants via elevation of antioxidant activity and decrease of lignification of the walls.  相似文献