جستجوی مقالات مرتبط با کلیدواژه "روی کلرید" در نشریات گروه "زیست شناسی"

The aim of present research is development of a simple green approach to produce Ag/AgCl nanocomposites using bacterial strains Bacillus haynesii and Bacillus halotorans, nominated at PN14F and B3, respectively, via an extracellular process. The bacterial strains PN14F and B3 were isolated from the soil and wastewater samples, using dilution and direct cultivation method. The Ag/AgCl nanocomposites were synthesized from the reaction of silver(I) nitrate solution and supernatant under completely sterile conditions in the presence of light. Moreover, a series of controlled experiments were provided to optimize some reaction conditions such as substrate concentration, PH, substrate volume, bacterial volume, the presence of glucose as an electron donor and silver(I) nitrate as inducer. The products were characterized using various techniques such as UV-Vis, XRD, FT-IR, FE-SEM and EDX. The resulting bionanocomposites (Ag1 and Ag2), with an average particle size of 30 and 22.3 nm, were efficient heterogeneous catalysts for reducing para-nitrophenol to para-aminophenl. Further, it was demonstrated their activity as the antibacterial properties against gram positive and negative bacteria. The results showed that the Ag2 sample with reducing time of 15 min is a more efficient catalyst than the Ag1 nanocomposite, which can be attributed to the smaller size of the Ag2 nanoparticles.

Molybdenum, as a trace and essential element has cofactor role in the structure of antioxidant enzymes. This study aimed at investigating the antioxidant role of sodium molybdate on cadmium chloride (CdCl2)-induced testicular toxicity in adult Wistar rats.

Eighty adult male rats were divided into ten groups, including healthy control, sodium molybdate alone, infertile control (3 mg/kg of CdCl2), and sodium molybdate plus CdCl2. The impacts of oral administration of sodium molybdate (0.05, 0.1, 0.2, and 0.4mg/kg) was evaluated in healthy and infertile animals. After the end of the period, serum levels of testosterone, FSH and LH and changes in body weight and testicular,the number of embryos obtained from fertility evaluation.Data were analyzed by analysis of variance (ANOVA) and Tukey test.

Final body weight, weight gained, testicular weight and ratio of testicular weight to body weight, serum level of male sex hormones and number of fertility fetuses in infertile experimental groups treated with sodium molybdate were significantly different from the infertile control group (P< 0.05).

The current findings suggested that sodium molybdate performs as a strong protective agent from CdCl2-related testicular toxicity in rats.

Previous studies have shown that the anxiolytic effects of different zinc chloride in male and female rats is Castration post- pubertaly. This study, the effect of zinc chloride on anxiety and deppresive behaviors of rats, in ovarectomized peri-pubertaly was investigated. In this experiment, fifty female rats were ovariectomized at postnatal day 21-22 and then on postnatal day 75, different doses of zinc chloride (0, 5, 10 and 20 mg/kg; IP) were administered 30 min before the elevated plus maze and forced swimming test. Ovarectomized significantly decreased the time spent in the open arms in ovarectomized rats compared to the sham group (p

This study evaluated the effects of calcium chloride as alleviator agent in salinity stress on Catharanthus roseus. 49- day- old plants were treated with different concentrations of NaCl (0, 35, 70 and 100 mM) alone and in combination of various CaCl2 concentration (0, 5 and 10 Mm) for 21 days. Then, percent of Inhibition of 1,1-diphenyl-2- picrylhydrazyl radical (I%), activity of antioxidant enzymes, contents of photosynthetic pigments, leaf number and area were measured. The results indicated that pigments contents, leaf area and number were significantly decreased by salinity. Addition of CaCl2 to salinity-stressed plants increased of pigments contents, leaf area, the activitiy of antioxidant enzymes and I% in compared to plants grown with NaCl alone. The maximum enhancement was observed with the combined treatments (100mM NaCl 5mM CaCl2). The results are discussed in terms of the beneficial effects of calcium supply on the growth of vinca under saline conditions.

Olive is one of the moderately resistant plants to salinity and the amount of resistance depends on the cultivar. Therefore, this species can be used as a model to study the responses of wooden plants to salt stress. In this study, six-months-old plantlets of three olive cultivars, including Arbequina, Arbosana, and Koroneiki were under salt stress through various concentrations of sodium chloride, containing 0, 50, 100, and 200 mM for five months, and sprayed with proline at 0, 100, and 200 mg/L for three times. At the end of the stress period, the number of leaves on each plant was counted; and thickness, length and width, and fresh and dry weight of the leaves were measured. Carotenoid content of leaves was determined using DMSO, total leaf phenol was measured by Folinciocalteu reagent, and glucose levels were estimated based on McCready. The results indicated that the number of leaves was decreased by increasing salinity levels and Arbosana had the greatest reduction. Koroneiki showed a significant reduction in leaf length and width at 200 mM and application of proline could not prevent this decline. The lowest fresh and dry weight was observed at 200 mM salinity. Leaf thickness was increased in the response of salt stress and the content of carotenoids reduced. Among the cultivars studied, Arbosana had the lowest total phenolic contents. Also, at salinity 200 mM, the highest and the lowest sugar content was observed in Arbosana and koroneiki, respectively. Plantlets treated with proline 200 mg/L had the highest carbohydrates.

Due to high perishability of tomato, it cannot be stored for long duration but by means of postharvest technologies somewhat can control their decay. Calcium as an essential plant nutrient actively participates in cell wall structure. The current experiment was conducted to find the effect of calcium on postharvest life of tomato fruit cv. "Dafnis". The experiment was conducted to asses the shelf life of tomato using treatments of calcium choloride (%1, %1.5, %2) and calcium ascorbate (%0.25, %0.5, %1). After treatment, the fruits were presereved at an incubator with 10 °C and 90% humidity for 35 days. After that the fruits were gotten out each 7 days and were assesed to determine parameters such as titratable acid, pH, soluble solids, vitamin C, firmness, weight loss and lycopene content. experiments was performed as a factorial in a complete randomized design with three replications. The results showed that calcium treatments, had a significant effects on all measured indexes. The lowest lycopene content was recorded at the %1 calcium ascorbate and except with %2 calcium choloride it to had significant difference to other treatments. The lowest pH, soluble solids, the highest titratable acid and vitamin C in the %1 calcium ascorbate and except with %2 calcium choloride it to had significant difference to other treatments.. According to the result of this study, treated fruits with %1 calcium ascorbate and 2% calcium choloride cause maintain fruit quality properties during storage period.

Zinc is one of micronutrients which reduces toxicity of sodium in plants and plays an important role in helping to the survival of crop plant under salinity stress. The research was conducted in a factorial experiment in completely randomized design with three replications in arak university in 1391 autumn. In this study، the effects of four salinity levels (0، 45، 90 and 120 mM NaCl) and three ZnSO4 levels (0، 5 and 10 μM) on tomato (Lycopersicum esculentum) were investigated. The results showed that single salinity decreased of the growth parameters، photosynthetic pigments and protein content، whereas increased the value of proline and carbohydrate in compared to the control plants. The results also showed that zinc treatment had positive effect on growth parameters، photosynthetic pigments، protein and carbohydrate content، however ZnSO4 treatment reduced the amounts of proline. Treatment of tomato plants under salinity stress with ZnSO4 reduced significantly the negative effects of salinity stress on these parameters. The highest values of growth indexes، photosynthetic pigments and protein were measured in plants without salt stress and concentrations of 10 μM Zn and the lowest values of this indicators were measured in plants under 120 mM NaCl without Zn. Therefore، it is recommended that for growing tomato in saline soils with zinc deficiency، Zn should be supplied in a adequate quantities to soils or used of ZnSO4 foliar sprays.

Ethylene، a phytohormone، is produced during in vitro plant tissue culture and its accumulation is associated with reduction of growth and morphological changes. The aim of this study was to evaluate application of CoCl2، as ethylene synthesis inhibitor، on growth and some physiological parameters as well as expression of ACC oxidase gene of potato. In this study، nodal segments of potato (Solanum tuberosum L.) cv. White Desiree were cultured on MS medium containing concentration of 0، 5، 10، 15، 20، 30، 40، 60 mg/L CoCl2. After 5 weeks، chlorophyll a،b، total، cartenoied، content، leaf area and expression level of ACC oxidase gene were investigated. CoCl2 inhibited root production in aerial parts and increased leaf areas and amount of chlorophyll a،b and carotenoid. Application of 20 mg/L CoCl2 was the best for potato growth. ACC oxidase gene expression was decreased at this concentration. Application of CoCl2 decreased ACC oxidase gene expression and prevented ethylene accumulation in the in vitro culture and consequently improved growth of potato plant.