-
Open Access Article
1 - The investigation of Allelopathic potential of 70 wheat (Triticum aestivum) cultivars on germination and seedling growth of volunteer canola (Brassica napus)
Narges Mohamadi Elias Soltani Mostafa Oveisi Hossein RamshiniAllelopathic effects of plant can be one of the best ways to reduce the applying of herbicides which are high costly to register and have environmental effects. Therefore, the aim of this study was to investigate the allelopathic effects of wheat cultivars and to identi MoreAllelopathic effects of plant can be one of the best ways to reduce the applying of herbicides which are high costly to register and have environmental effects. Therefore, the aim of this study was to investigate the allelopathic effects of wheat cultivars and to identify the ability of them to control weeds. a field and laboratory experiment was conducted in Research Farm and Seed Technology laboratory of Aburaihan Campus, University of Tehran, during 2015-16. Seeds of 70 wheat cultivars were sown at 600 square meters of Research Farm and samples were taken for bioassay at the tillering stage. To separate the impact of allelopathic extract and osmotic potential of the extracts, different solutions were made with the same osmotic potential for each extract. Then, experiments simultaneously were conducted to investigate the effects of extract and osmotic potential on germination of canola. The results of separations of allelopathic and osmotic potential effects of extractions showed that the inhibition of canola germination is related to allelopathic effects and not osmotic potential of extraction (PEG). Results indicated that allelopathic effects of wheat cultivars had slightly increased during the releasing period of cultivars from 1940 until now, but this increase was not significant. This shows that breeders had not attention to allelopathy of wheat cultivars during breeding programs. Results indicated that there were some cultivars with high allelopathy and it is possible to include them in breeding programs to produce cultivars with high potential of weeds control. Manuscript profile -
Open Access Article
2 - Germination modeling of Eryngium caeruleum seeds with hydro thermal time model
Mohammad Lotfi asle giglo Mostafa Oveisi Hamid Rahimian- mashhadi Behnaz Pourmorad kaleibar Mohammad Hossein NaeimiThis study was conducted to evaluate the effect of temperature and moisture on germination of Eryngium caeruleum seeds as factorial experiment in a completely randomized design with three replications at weed science laboratory, college of agriculture and natural resour MoreThis study was conducted to evaluate the effect of temperature and moisture on germination of Eryngium caeruleum seeds as factorial experiment in a completely randomized design with three replications at weed science laboratory, college of agriculture and natural resources, university of Tehran. Factors were seven temperatures (5, 10, 15, 20, 25, 30 and 35°c) and seven levels of moisture (0, -2, -4, -6, -8, -10 and -12 bar) and hydro thermal time model used for description of Eryngium caeruleum germination. Germination parameters including base temperature (Tb), optimum temperature (To), the minimum moisture needed for start of germination (Wpb), decreasing coefficient (b) and standard deviation (Sigma) were obtained 2.39, 23.52, -0.93, 0.13 and 0.34 respectively, affected by different levels of temperature and moisture by using hydro thermal time model. The results also showed that germination percentage and rate increased up to -4 bar in base temperature and these germination characteristics reached to their highest level in optimum temperature. According to the results of this study, it can be said that the seeds of Eryngium caeruleum do not have resistance to the water stress at very low and very high temperatures, and have the maximum resistance at 20°c. Manuscript profile -
Open Access Article
3 - Polyethylene glycol embedded tribromide as an efficient and reusable catalyst for the library synthesis of nitrogen containing heterocycles
Sanny Verma -
Open Access Article
4 - Liquid–liquid equilibria of aqueous two phase system containing of PEGDME and (NH4)2 SO4 at different temperatures and its application in partitioning of lactic acid
Mohammed Taghi Zafarani Moattar Hemayat Shekaari Tohid Hashemzadeh -
Open Access Article
5 - Effect of Osmotic Stress on Seed Germination Indices of Nigella sativa and Silybum marianum
حمیدرضا Balouchi A. Yadavi M. Movahedi DehnaviEvaluation of medicinal plants to drought and salt stress tolerance, in an attempt to plant them under drought and saline regions, is of utmost importance. Environmental stresses, especially drought and salt, reduce the global crop yields more than other factors. Select MoreEvaluation of medicinal plants to drought and salt stress tolerance, in an attempt to plant them under drought and saline regions, is of utmost importance. Environmental stresses, especially drought and salt, reduce the global crop yields more than other factors. Selection of drought tolerant crops at germination stage, usually is, the fast and low cost method. In order to study the effect of osmotic stress on germination indices of black cumin and milk thistle, an experiment carried out in a completely randomized design with four replications at the Seed Technology Laboratoary of Yasouj University in 2008. Treatments were 0 (as control), -2.4, -4.8, -7.2 and -9.4 bar osmotic potentials created by using PEG 6000. Results showed that, decreasing of osmotic potential reduced speed of germination and its percentage, root and shoot lengths and dry matter in these two plants. Black cumin showed higher tolerance, to -4.8 bar osmotic potential, as compared to milk thistle. However, milk thistle showed higher tolerance to drought stress, up to this osmotic potential (-4.8 bar), compared to black cumin. Milk thistle had lower germination speed and percentage at higher drought stress as compared to black cumin. Generally, milk thistle showed better growth and survival than black cumin due to its higher root and shoot length and dry matter. Manuscript profile -
Open Access Article
6 - Polyethylene Glycol Coated NiFe2O4 Nanoparticles Produced by Solution Plasma Method for Biomedical Applications
Masoud Shabani Ehsan Saebnoori Ali Hassanzadeh-Tabrizi Hamid Reza Bakhsheshi-Rad -
Open Access Article
7 - Effect of premixing of spermidine and polyethylene glycol on germination and physiological and morphological activity in Triticum durum wheat with Salinity stress
Parvane RahdariIn order to effect of spermidine and polyethylene glycol pretreatment on germination and some physiological and morphological activity durum wheat under salinity stress a experiment with 20 treatments, three replications was conducted in 60 experimental units. Tre MoreIn order to effect of spermidine and polyethylene glycol pretreatment on germination and some physiological and morphological activity durum wheat under salinity stress a experiment with 20 treatments, three replications was conducted in 60 experimental units. Treatments included five levels of spermidine (0/ 02,0/ 05,0/ 1 and 0/15 mM) and four levels of polyethylene glycol (0- 2,- 4 and -5 bar). The results showed that the use of spermidine increased the relative weight contact of leaf (RWC), leaf area ratio, chlorophyll s and phenolic compounds . In this study, carotenoids content and leaf antioxidant activity decreased with increasing spermidine level and also had no statistically significant effect on germination. With increase of polyetylen glycol antioxidant activity, carbohydrates and total phenolics increased but decreased germination. Therefore, according to the above results, application of spermidine and polyethylene glycol as seed pre-treatments can have significant effects on physiological and morphological activities in stress conditions and increase plant potency under stress conditions. Manuscript profile -
Open Access Article
8 - Evaluation of drought tolerance in sesame (Sesamum indicum L.) genotypes using germination traits and indices under drought conditions
Mohammad Amin Baghery Seyed Kamal Kazemitabar Ali Dehestani Pooyan Mehrabanjoubani Hamid Najafi ZariniSesame as one of the most important oilseed crops has high industrial, food, and medicinal potentials. Drought stress challenges sesame production, especially at the germination and seedling stages. To screen sesame genotypes for drought tolerance at the germination sta MoreSesame as one of the most important oilseed crops has high industrial, food, and medicinal potentials. Drought stress challenges sesame production, especially at the germination and seedling stages. To screen sesame genotypes for drought tolerance at the germination stage, a factorial experiment was performed in a completely randomized design with 3 replications. The studied factors included 4 drought levels induced by polyethylene glycol (concentrations of 0%, 20%, 25%, and 30%) and 15 sesame genotypes. Based on the results of ANOVA, the effect of genotype, drought, and their interaction on all studied traits including germination rate, germination speed, vigor index 1 and 2, radicle length, plumule length, and seedling fresh and dry weight was significant (P<0.01). Significant reduction (P<0.05) was observed in all levels of stress compared to the control in the studied traits. Germination rate, radicle length, and plumule length (with 10%, 17%, and 18% reduction, respectively) showed less sensitivity to drought stress at weak level (20% concentration), while the most negative effect was obtained for vigor index 2, seedling dry weight and seedling fresh weight (with 52.5%, 47.3%, and 34.4% reduction, respectively). On the other hand, the highest decrease was observed in plumule length, vigor index 1 and 2 (98%, 97%, and 96%, respectively), under severe drought (30% concentration). The calculated drought tolerance indices of each trait were used for principal component analysis and biplot visualization. Thus, genotypes were divided into 5 categories based on tolerance. Dashtestan 2 and Darab 1 genotypes were selected as the most tolerant and Qaem, Yekta, Sudan, and Kerman genotypes were selected as the most sensitive genotypes. The findings of this study can be used in future studies and breeding programs of sesame for drought tolerance. Manuscript profile -
Open Access Article
9 - One-pot and efficient synthesis of triazolo[1,2-a]indazole-triones catalyzed by poly(ethylene glycol) based magnetic dicationic ionic liquid
Bijan Mombeni Goodajdar Soghra Soleimani -
Open Access Article
10 - اثر تانن تفاله انگور و برگ بلوط بر گوارشپذیری آزمایشگاهی ماده آلی و تجزیهپذیری شکمبهای در گوسفند
M.J. Abarghuei Y. Rouzbehan D. Alipourاثر تانن­های تفاله انگور و برگ بلوط با استفاده از سه سری آزمون تولید گاز بر گوارش­پذیری آزمایشگاهی ماده آلی و تجزیه­پذیری شکمبه­ای ماده خشک و پروتئین خام در گوسفند مورد آزمایش قرار گرفت. پلی­اتیلن­گلیکول برای خنثی کردن اثرات تانن استفاده گردید. ت Moreاثر تانن­های تفاله انگور و برگ بلوط با استفاده از سه سری آزمون تولید گاز بر گوارش­پذیری آزمایشگاهی ماده آلی و تجزیه­پذیری شکمبه­ای ماده خشک و پروتئین خام در گوسفند مورد آزمایش قرار گرفت. پلی­اتیلن­گلیکول برای خنثی کردن اثرات تانن استفاده گردید. تولید گاز در زمان­های 2، 4، 6، 8، 12، 24، 48، 72، 96 و 120 ساعت انکوباسیون ثبت گردید. ترکیب شیمیایی (گرم در کیلوگرم ماده خشک) تفاله انگور و برگ بلوط تعیین گردید و مقادیر ماده آلی 940 و 940، پروتئین خام 94 و 116، دیواره سلولی 568 و 515، دیواره سلولی بدون همی­سلولز 467 و 316، لیگنین 242 و 93، کل ترکیبات فنولیک 5/70 و 82، تانن کل 7/49 و 73، تانن متراکم 79 و 4/5، تانن قابل هیدرولیز 40 و 70 بود. استفاده تفاله انگور و برگ بلوط مقدار گوارش­پذیری آزمایشگاهی ماده آلی، اسیدهای چرب فرار کوتاه زنجیره، بخش غیر قابل­ حل ولی قابل تخمیر و سرعت تخمیر را در مقایسه با تیمار شاهد کاهش داد (05/0P<). افزودن پلیاتیلن­گلیکول مقدار تولید گاز را در کل زمان­های انکوباسیون افزایش داد. کنتیک تولید گاز، گوارش­پذیری آزمایشگاهی ماده آلی و اسیدهای چرب فرار کوتاه زنجیره با افزودن پلی­اتیلن­گلیکول افزایش یافتند (05/0P<). درصد افزایش تولید گاز در تفاله انگور بیشتر از برگ بلوط بود. مقادیر پروتوزوآی کل، جنس ایزوتریجا و داسی­تریچا و زیرخانواده­های انتودینینه، دیپلودینینه و افریوسکالسینه با اضافه کردن تفاله انگور و برگ بلوط کاهش یافتند. با افزودن پلی­اتیلن­گلیکول به تیمار حاوی تفاله انگور، جمعیت پروتوزوآی کل، زیرخانواده­های انتودینینه، دیپلودینینه و افریوسکالسینه را افزایش یافت (05/0P<)، ولی در تیمار حاوی برگ بلوط جنس ایزوتریچا و داسی­تریچا و زیرخانواده دیپلودینینه افزایش یافت (05/0P<). مقدار تجزیه­پذیری مؤثر ماده خشک و پروتئین خام (گرم در کیلوگرم ماده خشک) یونجه، تفاله انگور و بر بلوط به ترتیب (6/646، 7/357، 3/362) و (821، 3/227، 202) بر اساس روش کیسه­های نایلونی برآورد گردید. در کل، استفاده از تفاله انگور و برگ بلوط تولید آمونیاک و جمعیت پروتوزوآ را کاهش داد. جیره­های حاوی تفاله انگور و برگ بلوط در مقایسه با یونجه قابلیت ­تخمیر کمتری داشتند. افزودن پلی­اتیلن­گلیکول به جیره­های حاوی تفاله انگور و برگ بلوط قابلیت ­تخمیر را بهبود بخشید. Manuscript profile -
Open Access Article
11 - The Influences of Adding Polyethylene Glycol and Activated Sodium Bentonite on the Performance, Blood Parameters, and Muscle Mineral Content of Saanen Goats Fed Pistachio Byproducts
M. Kordi A.A. Naserian F. Samadian -
Open Access Article
12 - بخش بندی پروتئین خام و تولید گاز در سیلاژهای یونجه عملآوری شده با عصاره محصولات فرعی پسته در شرایط آزمایشگاه
ا. مختارپور ع.ع. ناصریان ر. ولیزاده م. دانش مسگران ف. پورملاییبه منظور بررسی بخش­های مختلف پروتئین خام و تولید گاز در شرایط آزمایشگاه در سیلاژهای یونجه عملآوری شده با سطوح مختلف عصاره محصولات فرعی پسته و ارزیابی ارزش زیستی تانن­های آن، دو آزمایش انجام شد. محصولات فرعی پسته با نسبت 1:5 (وزن به حجم) به مدت 12 ساعت در آب خیس Moreبه منظور بررسی بخش­های مختلف پروتئین خام و تولید گاز در شرایط آزمایشگاه در سیلاژهای یونجه عملآوری شده با سطوح مختلف عصاره محصولات فرعی پسته و ارزیابی ارزش زیستی تانن­های آن، دو آزمایش انجام شد. محصولات فرعی پسته با نسبت 1:5 (وزن به حجم) به مدت 12 ساعت در آب خیسانده شدند. پس از صاف کردن و تغلیظ، عصاره خام به علوفه تازه یونجه اضافه شد تا به ترتیب سطوح 1، 2 و 3 درصد ماده خشک یونجه، تانن به دست آید و سپس به مدت 60 روز سیلو شدند. چهار تیمار به این ترتیب بود؛ سیلاژ یونجه بدون عملآوری با عصاره محصولات فرعی پسته، به عنوان شاهد (T0)، اضافه کردن تانن محصولات فرعی پسته در سطح 1 درصد (T1)، 2 درصد (T2) و 3 درصد ماد خشک (T3). عملآوری سیلاژ یونجه، میزان ترکیبات نیتروژنه غیر پروتئینی را کاهش و بخش B2 را در طی سیلو شدن، افزایش داد. تولید گاز تجمعی پس از 96 ساعت انکوباسیون، قابلیت هضم ماده آلی (OMD) و انرژی قابل متابولیسم (ME) در تیمار T2 و T3 در مقایسه با تیمار شاهد کاهش پیدا کرد. میزان تولید گاز و اسیدهای چرب کوتاه زنجیر (SCFA) در سیلاژهای عملآوری شده در حضور پلی اتیلن گلیکول (PEG) افزایش یافت که نشان می­دهد وجود ترکیبات فنولی و تانن­ها باعث کاهش تولید گاز شد. می­توان نتیجه گرفت که عملآوری سیلاژ یونجه با عصاره محصولات فرعی پسته از طریق ممانعت میکروبی، می­تواند منجر به کاهش هدرروی نیتروژن در طی سیلو شدن و کاهش تجزیه پذیری ماده آلی شود. Manuscript profile -
Open Access Article
13 - Antioxidant capacity and chemical composition of Carum copticum under PEG treatment.
Roya Razavizadeh Mozhdeh Karami -
Open Access Article
14 - Effects of hydro- and bio-priming on some physiological and biochemical characteristics of quinoa (Chenopodium quinoa) seedlings under drought stress
Saba Dashab Heshmat Omidi -
Open Access Article
15 - Study of genetic variation of rice genotypes on the germination components and seedling growth in the drought stress condition
zahra khodarahmpour Elahe Ghorbani Abdolali GilaniThe present study was conducted to study genetic diversity in 26 rice genotypes (lRRl heat tolerant collection) in 2016 in Khuzestan Agricultural and Natural Resources Research Center as a factorial experiment based on a completely randomized design with three replicati MoreThe present study was conducted to study genetic diversity in 26 rice genotypes (lRRl heat tolerant collection) in 2016 in Khuzestan Agricultural and Natural Resources Research Center as a factorial experiment based on a completely randomized design with three replications including 24 lines and 2 hybrids as the first factor and drought stress with PEG 6000 in 5 levels of zero (control), -0.3, -1.8, -3.3 and -4.8 Bar were performed as the second factor. The results of analysis of variance showed that there was a significant difference between drought levels, genotypes and their interaction in all traits at a probability level of one percent. The lowest indices of germination and seedling growth were observed at the level of -4.8 Bar. The highest positive and significant correlation (r = %90**) was obtained between shoot length and seedling length. In principal component analysis, the four first components accounted for 85% of the total diversity. Cluster analysis with Ward method included genotypes in three clusters. In the first cluster of lines 48, 15, 35, 44, 42, 20, 19, 5, 28, 10, 16, 4, 2, 55, 53, 31, 34, 36 and HB2 hybrid, in the second cluster of lines 25 and 23 and hybrid HB1 and in the third cluster were lines 40, 13, 41 and 21. According to the results of mean of comparison, biplot and cluster analysis of the second cluster genotypes in terms of germination rate, shoot length, root length, seedling length, s Manuscript profile -
Open Access Article
16 - The Effect of Drought Stress on Germination and Early Growth of Sesamum indicum Seedling’s Varieties under Laboratory Conditions
Mohammad Hossein Bijeh keshavarziEnvironmental stresses specially drought, play an important role in decreasing plant growth, particularly during germination in dry and semi dry area. To considering the effect of drought stress caused by polyethylene glycol on germination and characteristics of 2 spice MoreEnvironmental stresses specially drought, play an important role in decreasing plant growth, particularly during germination in dry and semi dry area. To considering the effect of drought stress caused by polyethylene glycol on germination and characteristics of 2 spices of Sesamum indicum, we had done factorial and complete accidental plot with 4 treatments and 3 times repetition. Experimental treatments included osmotic potential in 4 levels (0, -4, -6, -10 bar) which was produced by polyethylene glycol 6000 and 2 sesame species (Safi Abadi and Dezfol). All data had been analyzed by SAS software and comparison of means had been done by Duncan test at 5% probable level. The results showed that, percentage and speed of all spices’ germination decline by osmotic potential enhancement. Other measured parameters such as radicle and coleoptile length, dry and wet weight declined by increasing osmotic potential as well. Manuscript profile -
Open Access Article
17 - Effect of the ionic liquid 1-butyl-3-methyl-imidazolium bromide as adjuvant on the formation of {PEG 600-potassium citrate} aqueous biphasic system at different temperatures
Sholeh Hamzehzadeh Mostafa AbbasiAbstract: In biotechnology, separation, extraction, and purification of biomolecules using aqueous biphasic systems, as environmental and economic sustainable alternatives for conventional water-organic solvent extraction techniques, have always been the focus of great MoreAbstract: In biotechnology, separation, extraction, and purification of biomolecules using aqueous biphasic systems, as environmental and economic sustainable alternatives for conventional water-organic solvent extraction techniques, have always been the focus of great attention and examina-tion. One approach proposed by researchers is based on the use of ionic liquids (ILs) as adjuvants in ABS, making the capability of these systems for the extraction of biomolecules to be promoted. In this regard, this work is devoted to study the effect of IL 1-butyl-3-methyl imidazolium bromide ([C4C1im] Br) on the formation of ABS Composed of a polyethylene glycol (PEG) with molecular weight 600 and a biodegradable organic salt potassium citrate. For this purpose, the binodal curves and the liquid-liquid equilibrium (LLE) data of the studied ABS, along with the partition coeffi-cients of [C4C1im]Br were determined at two temperatures of 278.15 K and 318.15 K. The results obtained indicate that the ability of [C4C1im]Br to promote the formation of the studied ABS de-creases with increasing temperature, so that at 318.15 K, the addition of IL makes the formation of two-phase system more difficult. In addition, [C4C1im]Br displays the partition coefficients greater than one for all the compositions and temperatures studied, which increases with increasing TLL at a given temperature. Manuscript profile -
Open Access Article
18 - Responses of Almond Genotypes to Osmotic Stress Induced In Vitro
S. Karimi A. Yadollahi K. Arzani -
Open Access Article
19 - Physiological and Morphological Responses of Almond Cultivars under In Vitro Drought Stress
Ehsan Akbarpour Ali Imani Shahin Ferdowskhah Yeganeh -
Open Access Article
20 - Selecting Drought Resistant Sweet Corn Cultivars Based on Germination Percentage and Seedling Proline Content under Osmotic Potentials Stress
Ali Shahriari Adam B Puteh Ghizan B Saleh Anuar B Abdul Rahim -
Open Access Article
21 - The effects of drought stress on seed germination and some of morphological and physiological traits in Trachyspermum ammi
امین باقی زاده Malihe Afroushte Baratali FakheriIn order to assess the response of ajowan to drought stress that induced by PEG 6000 on germination and growth stages, two separate experiments that in each useed completely randomized design with three replications were done. In first experiment, the response of germin MoreIn order to assess the response of ajowan to drought stress that induced by PEG 6000 on germination and growth stages, two separate experiments that in each useed completely randomized design with three replications were done. In first experiment, the response of germination of ajowan seeds was investigated to different levels of drought stress include osmotic potential of zero (control), - 1/5, -2, -2/5 and -3bar that prepared by PEG6000. The second experiment was same first, but in this experiment, morphological and physiological characters of ajowan in different level of drought stress were evaluated. Results of Anova at our data showed that drought stress has significant effect (p≤0/01) on germination characters such as germination percentage, germination rate, height of plumule, length of radicle, dry weight of radicle and plumule. Mean comparison of treatments showed, with increase in drought stress, all the above characters have been reduced. Morphological traits such as leaf area, fresh and dry weight of shoot and root and shoot dry weight ratio to root decreased under drought stress. Also, drought stress had a significant effect on the amount of proline and soluble sugars in the aerial part and root. Comparison of mean of treatments showed that, with increasing stress, the amount of proline and soluble sugars in the shoot and root increased (p≤0/01). The results showed, that germination parameters were reduced by drought stress. Ajowan showed differently responce to tolerate drought stress. Ajowan plant for tolerance to drought stress has different reactions, including reduction of traits such as leaf area and dry and fresh weight of aerial part and root and increase traits such as proline content and soluble sugars. Manuscript profile -
Open Access Article
22 - The effects of drought stress on seed germination and some of morphological and physiological traits in Trachyspermum ammi
A. Baghizadeh M. Afroushte, B. FakheriIn order to assess the response of ajowan to drought stress that induced by PEG 6000 on germination and growth stages, two separate experiments that in each useed completely randomized design with three replications were done. In first experiment, the response of germin MoreIn order to assess the response of ajowan to drought stress that induced by PEG 6000 on germination and growth stages, two separate experiments that in each useed completely randomized design with three replications were done. In first experiment, the response of germination of ajowan seeds was investigated to different levels of drought stress include osmotic potential of zero (control), - 1.5, -2, -2.5 and -3bar that prepared by PEG6000. The second experiment was same first, but in this experiment, morphological and physiological characters of ajowan in different level of drought stress were evaluated. Results of Anova at our data showed that drought stress has significant effect (p≤0/01) on germination characters such as germination percentage, germination rate, height of plumule, length of radicle, dry weight of radicle and plumule. Mean comparison of treatments showed, with increase in drought stress, all the above characters have been reduced. Morphological traits such as leaf area, fresh and dry weight of shoot and root and shoot dry weight ratio to root decreased under drought stress. Manuscript profile -
Open Access Article
23 - Effects of Osmotic Potential on Germination and some Characters in cimin (Cuminum Cyminum ) Genotypes
M. kakaei D. Kahrizi M. MansouriTo control water potential in seed germination studies osmotic solution of polyethylene glycol (PEG) are commonly used environmental stress, such as drought and (Osmotic) stress can play an important role in disturbing different stage of medical plant growth, developmen MoreTo control water potential in seed germination studies osmotic solution of polyethylene glycol (PEG) are commonly used environmental stress, such as drought and (Osmotic) stress can play an important role in disturbing different stage of medical plant growth, development, and especially seed germination in arid and regions high percent of medicines are used for people have plant origin. With attention to the development of drought area and the shortage of agricultural area, it comes in to great importance to make use of drought tolerant plant an experiment was carried out in order to study the effect of different drought (Osmotic) levels on Cuminum Cyminum in germination in a completely randomized design with three replications. Drought (Osmotic) levels applied were zero (Control), 5%, 10% and 15% (0, -0.03, -0.19 and -0.41 Mpa). The purpose of this study was to determine genotype in PEG solution had a detrimental effect on germination percentage and germination rate. Manuscript profile -
Open Access Article
24 - Investigation of mechanical and biological properties of functionalized polycaprolactone and polyethylene glycol diacrylate based scaffold reinforced with hydroxyapatite
نرجس کوپائی Akbar KarkhanehThe purpose of this study is synthesised of functionalized polycaprolactone and polyethylene glycol diacrylate based scaffold in the presence of hydroxyapatite (HA) particles and investigated of mechanical and biological properties of scaffolds. . At the first step, PCL MoreThe purpose of this study is synthesised of functionalized polycaprolactone and polyethylene glycol diacrylate based scaffold in the presence of hydroxyapatite (HA) particles and investigated of mechanical and biological properties of scaffolds. . At the first step, PCL diol was acrylated with acryloyl chloride and confirmed using fourier transform infrared (FTIR).Then, the scaffolds were synthesized by radical crosslinking reaction of polycaprolacton acrylate and polyethylene glycol diacrylate (PEGDA) in the presence of hydroxyapatite (HA) particles and particulate technique with sodium chloride. The prepared samples were characterized using techniques such as scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FTIR), and dynamic mechanical thermal analysis (DMTA). Results show that increasing the ratio of PEGDA to polycaprolactone diacrylate (PCLDA) led to increase of tan δ peak and decrease of compressive modulus of the network, respectively. It was found that the incorporation of HA particles with the polymer matrices resulted in an increased of compressive modulus and a decrease of tan δ peak. Cytocompatability of the scaffolds were assessed by direct contact test and staining cell. Results indicated no toxicity, and cells attached and spread on the pore walls offered by the scaffols. Thus, the results indicated that the PCLDA/PEGDA/HA scaffolds have the potential of being used as promosing substrates in bone tissue engineering. Manuscript profile -
Open Access Article
25 - Corrosion Inhibition of Polyethylene Glycol on Carbon Steel in Sulfuric Acid Solutions and its Synergism with Schiff Base
sina jahadi mojtaba nasr esfahaniThe inhibiting action of Schiff base and polyethylene glycol (Salpn-PEG) complexes on low-carbon steel corrosion in 0.5 M sulfuric acid was examined using weight loss, potentiodynamic polarization and spectroscopy electrochemical impedance (EIS) techniques. Schiff base MoreThe inhibiting action of Schiff base and polyethylene glycol (Salpn-PEG) complexes on low-carbon steel corrosion in 0.5 M sulfuric acid was examined using weight loss, potentiodynamic polarization and spectroscopy electrochemical impedance (EIS) techniques. Schiff base N, N’-bis(salicyladehyde)-1,3-diaminopropane (Salpn) was synthesized by salicylaldehyde and 1,3- diaminopropane. PEG/Salpn complex with weight ratio 1:4, 2:4 and 3:4 of Salpn and PEG were prepared in methylene chloride solvent by a simple deporotonation procedure. Obtained Results show that PEG/IMZ complex is very effective corrosion inhibitor of carbon steel in the acid environment in compare with PEG, Salpn and noncomplex form of them. Maximum corrosion inhibition was obtained for PEG/Salpn complex with weight ratio 1:4 of Salpn and PEG. The inhibition efficiency increased with the increase in the temperature up to 45°C and decrease in higher temperatures. Results from all the corrosion tests were examined using SEM and are in reasonable good agreement. Adsorption thermodynamic data (〖K 〗_ads and 〖∆G〗_ads ) was calculated using the weight loss data Manuscript profile -
Open Access Article
26 - Seed germination indices and initial growth of safflower seedlings with different thousand kernel weights under drought stress
Hamid Bagheri Yousof Ghazi Khanloosani Esmaiel Zangani Babak Andelibi Mohamad Reza Azimi Moghadam Soleiman JamshidiTolerant seeds to drought stress could play significant role in steady seedling establishment and subsequent yield increase. In order to study the germination and initial seedling growth indices of safflower (cv. Sina) seeds with different thousand kernel weights (TKW) MoreTolerant seeds to drought stress could play significant role in steady seedling establishment and subsequent yield increase. In order to study the germination and initial seedling growth indices of safflower (cv. Sina) seeds with different thousand kernel weights (TKW) of 23, 23.83, 25.13 and 27.27 g, under different drought stress intensities, an experiment was carried out as factorial based on a completely randomized design in Physiology Laboratory of Zanjan University. Drought stress levels comprising 0 (control), -4 and -8 bar were obtained using polyethylene glycol 6000. Increasing drought stress intensity significantly decreased germination percentage from 81.8% in control to 57.8% in -8 bar. Seeds with higher TKW were better in terms of germination percentage and germination coefficient rate. The seeds with 27.27 TKW produced longer radicle and plumule in drought stress condition. Besides, seeds with higher TKW showed higher vigor index and seedling dry and fresh matter. In conclusion, seeds with higher TKW showed higher germination indices and were more tolerant to drought stress. Manuscript profile
Sanad
Sanad is a platform for managing Azad University publications
Links
Related Centers
Technical Support
Official pages
The rights to this website are owned by the Raimag Press Management System.
Copyright © 2021-2024