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21.
Mehran Roohnia Amirhooman Hemmasi Ali Yavari Habibolla Khademieslam Behzad Bazyar 《Journal of Wood Science》2014,60(5):321-326
In the present study, elastic properties of scarf-jointed oak (Quercus castaneifolia) timbers with the application of two different types of adhesives (polyvinyl acetate and isocyanate) were evaluated using free flexural vibration of free–free beam method in different flexural directions of vibration, i.e., tangential and redial directions. Samples were taken from trees of Hyrcanian forests in Iran with nominal dimensions of 20 × 20 × 360 mm3. Comparing the results of elastic properties of clear oak wood beams with scarf-jointed samples wood showed that scarf joints with the bonding angles of 70° and 75°, covered by polyvinyl acetate adhesive, did not demonstrate any significant effect on modules of elasticity. Scarf-jointed beams with smaller joint angles (60° and 65°) were considerably weaker or totally unreliable in their moduli of elasticity. It is also shown that the magnitude of effect gets worst by using isocyanate rather than polyvinyl acetate adhesive. 相似文献
22.
Mohsen?MardiEmail author Hermann?Buerstmayr Behzad?Ghareyazie Marc?Lemmens Nooshin?Moshrefzadeh Peter?Ruckenbauer 《Euphytica》2004,136(1):45-50
Fusarium head blight (FHB) caused by Fusarium spp. is one of the most important fungal diseases of wheat (Triticum aestivum L.) in regions with wet climatic conditions. Improvement of the FHB resistance by developing new varieties requires sound knowledge on the inheritance of resistance. An 8 × 8 diallel analysis was performed to estimate general (GCA) and specific (SCA) combining ability of resistance to FHB. The F1s and parental lines were evaluated under artificial inoculation at the experimental field of IFA-Tulln, Austria during 2001 and 2002. Disease severity was evaluated by repeated scoring of the percentage of infected spikelets and calculating an area under the disease progress curve (AUDPC). The analysis of combining ability across two years showed highly significant GCA and non-significant SCA effects indicating the importance of additive genetic components in controlling FHB resistance. The significant GCA-by-year interaction presented the role of environmental factors in influencing the FHB reaction of wheat lines. The comparison of the crosses with low FHB infection and GCA effects of their parents showed that such crosses involved at least one parent with high or average negative GCA effect. The results revealed that it is feasible to use highly or moderately resistant genotypes and conventional breeding methods to achieve genetic improvement of FHB resistance in spring wheat. 相似文献
23.
In this research, composites based on polypropylene (PP), beech wood flour, and organomodified montmorillonite (OMMT) were
prepared and characterized for their properties. The blend nanocomposites were prepared by melt mixing of PP/WF at 50% weight
ratios with various amounts of OMMT (0, 3, and 6 per hundred compounds (phc)) in a Hakee internal mixer. Then the samples
were made by injection molding. The influence of organomodified montmorillonite contents on clay dispersion, physical and
mechanical properties of PP/wood flour composites were investigated. Results indicated that the flexural strength and modulus,
tensile strength and modulus increased by addition of 3 per hundred compounds (phc) of organomodified montmorillonite (OMMT),
but decreased with 6 phc OMMT addition. However, impact strength, water absorption and thickness swelling of the composites
decreased with increasing nanoclay loading. X-ray diffraction patterns (XRD) and transmission electron microscopy (TEM) revealed
that the nanocomposites formed were intercalated. Also, morphological findings showed that samples containing 3 phc of OMMT
had higher order of intercalation. 相似文献
24.
Mozafari Hamid Shirani Rad Amirhosein Jalili Ehsanollah Sani Behzad Rajabzadeh Faezeh 《Gesunde Pflanzen》2022,74(2):435-446
Canola (Brassica napus L.) oil yield and fatty acid composition are the function of genotype, climate conditions, morphology, and physiology as well as crop management. In this study, the reaction of different canola cultivars—in terms of seed oil content and fatty acids—to different planting dates and foliar zinc application during two experimental years (2016–2017) was investigated in the field in arid and semi-arid regions of Karaj, Iran. The experiment was performed as a factorial split plot in a randomized complete-block design with three replications. Three sowing dates (February 9, 19, 29) and two foliar zinc applications (non-application as control and zinc application; spraying in the stem elongation stage) were factorially randomized to main plots, and canola cultivars (Sarigol, Dalgan, Salsa, and Solar) were allocated to sub-plots. The results indicated that the effect of year, planting date, zinc application, cultivar, and the interaction effect of planting date and cultivar on quality traits (glucosinolate and fatty acids) and seed yield were significant (p?<?0.01). The delay in winter planting of spring canola cultivars caused a significant reduction in seed yield, oil yield, and the content of oleic, linoleic, and palmitic fatty acids and increased the content of linolenic, erucic, stearic, arachidic, and behenic fatty acids and glucosinolate. The highest seed yield (4732.2?kg/ha), oil yield (2066?kg/ha), and oleic acid content (66.52%) were observed in the Dalgan cultivar in the zinc application treatment with normal planting date (February 9). The Salsa cultivar had the highest content of erucic acid (0.46%) and glucosinolate (17.3?μmol/g meal) in the control treatment with the last planting date. Because the quality of edible canola oil depends on the increase in unsaturated fatty acids, particularly oleic and linoleic acids, and the reduction of erucic acid and glucosinolate, planting Dalgan cultivar with zinc application at the normal planting date is recommended for the study area and similar areas.
相似文献25.
Khansarinejad B Soleimanjahi H Ghaemi A Tiraihi T Pour Beiranvand S 《Iranian Biomedical Journal》2010,14(3):83-88
Background: Herpes simplex virus type-1 (HSV-1) establishes a lifelong latent infection in neurons following primary infection. The existence of latent HSV-1 DNA in the trigeminal ganglia of infected BALB/c mice was examined using a direct in situ PCR technique, based on Digoxigenin-11-dUTP detection system with anti-digoxigenin-peroxidase and 3,3''-diaminobenzidine (DAB) substrate. Methods: Eight-week-old male BALB/c mice were inoculated via the eye by 104 plaque forming unit of wild type Iranian isolates of HSV-1. After establishment of latency, trigeminal ganglia were removed and examined using in situ PCR to detect HSV-1 genome. Finally, the results of in situ PCR were verified by a two-round PCR method, using amplification cocktail of in situ reaction, as a template for a conventional gel base PCR. Results and Conclusion: The results suggest that a direct in situ PCR method using a peroxidase and DAB detection system is a useful means for detection of latent HSV-1 DNA in the latently infected ganglia. Key Words: Herpes simplex virus-1, Latency, In situ PCR, two-round PCR, Trigeminal ganglia 相似文献
26.
Mehri Javdi Ali Haghnazari Masoud Tohidfar Shahin Negari Behzad Ghareyazi 《Euphytica》2010,173(2):185-191
Successful identification of homozygous and heterozygous transgenic plant with currently available techniques such as southern
blot hybridization, dot blot hybridization, fluorescence in situ hybridization (FISH) and so on, demands tedious and time-consuming
procedures with a high proportion of ambiguous results. Real-time PCR is a quantitative and extremely precise method with
high throughput that could be applied to the analysis of large number of plants differing only by a factor of two in the amount
of target sequences. In the present study, we determined zygosity level of transgenes in cotton [Gossypium hirsutum L.] with two zygosity assays, based on TaqMan technology that uses a fluorogenic probe which hybridizes to a PCR target sequence flanked by primers. TPS, a single copy
gene per haploid Gossypium hirsutum genome was used as the endogenous reference to estimate copy number of transgene. Both assays were accurate and reproducible
in determination of the number of transgenes present in a cell line. These methods are standard curves and Delta delta C
t method. 相似文献
27.
Yalda Shokoohinia Seyed-Ebrahim Sajjadi Behzad Zolfaghari Giuseppina Chianese Giovanni Appendino Orazio Taglialatela-Scafati 《Fitoterapia》2010
Euphorbia macroclada Boiss., a spurge endemic to the Iranian plateau, afforded four pre-myrsinane polyesters, three α-phorboids and one A-seco-phorboid, a type of compound so far unreported within natural products. All new compounds were structurally elucidated by spectroscopic methods, and especially 2D NMR measurements. 相似文献
28.
29.
Behzad Murtaza Ghulam Murtaza Muhammad Sabir Gary Owens Ghulam Abbas Muhammad Imran 《Archives of Agronomy and Soil Science》2017,63(9):1267-1280
A 2-year field experiment was conducted to determine crop yield and N use efficiency (NUE) from a saline–sodic soil (clay loam) with and without application of gypsum. Treatments included two N application rates (15% and 30%) higher than the recommended one to the normal soil, and gypsum added at 50% and 100% of soil gypsum requirement (SGR) to the saline–sodic soil, both cultivated with rice and wheat during 2011–2013. Results revealed a decrease in pH of saturated soil paste (pHs), electrical conductivity of saturation extract (ECe), sodium adsorption ratio (SAR) and exchangeable sodium percentage with N fertilizer along with gypsum application in saline–sodic soil. However, the effect was most prominent when gypsum was added at 50% of SGR. Crop yield and NUE remained significantly lower (p < 0.05) in saline–sodic-soils as compared to normal soil. However, gypsum application reduced this difference from 47% to 17% since both yield and NUE increased considerably. Crop yield and NUE remained higher for wheat than for rice. During first year, higher doses of N with gypsum application at 50% SGR proved most effective, whereas, in subsequent year, recommended N along with gypsum at 50% SGR became more profitable. All these results lead us to conclude that gypsum application can ameliorate saline–sodic soil thereby increasing crop yield and NUE. 相似文献
30.
Evaluation of various quick methods for estimating furrow and border infiltration parameters 总被引：2，自引：2，他引：0
Hamed Ebrahimian Abdolmajid Liaghat Behzad Ghanbarian-Alavijeh Fariborz Abbasi 《Irrigation Science》2010,28(6):479-488
For estimating infiltration properties of surface irrigation, some ‘quick’ and easy methods have been developed. The main
objective of this study was to evaluate different ‘quick’ methods and to compare the obtained results with two new methods
proposed based on the Shepard one-point approach. For this purpose, data sets measured in six borders and five furrows were
used for evaluating different methods. Using the volume balance equation and estimated infiltration parameters, the total
infiltrated volume and advance times were predicted to evaluate the accuracy of estimated infiltration parameters. The results
showed that the modified Mailapalli and Elliott and Walker methods provided the lowest errors for both furrow and border irrigations.
The Elliott and Walker method predicted advance times with highest accuracy. There was very small difference between the Shepard
and new proposed one-point methods. The performance of the Elliott and Walker method was slightly better than the new proposed
two-point method for the experimental furrows, while a minor difference was found for the experimental borders. The results
also showed that the performance of the Elliot and Walker method would be improved using binomial approximation instead of
Kiefer approximation. 相似文献