Growing environmental concerns and regulatory pressure have necessitated the requirement for natural fiber-based composites for various applications. . This paper focuses on the performance evaluation of epoxy reinforced with Flax and flax-ramie fiber hybrid composites. The laminates were developed through the hand layup technique with Flax and Ramie fibers using epoxy resin. The prepared samples were further analyzed under various dynamic and static conditions, including Fast Fourier Transform (FFT) analysis, impact testing, water absorption testing, and density measurement. The flax-ramie hybrid composite shows dynamic and static properties, including better vibration control, impact resistance, and lower moisture absorption, compared to the flax fiber composite. With a density of 1.17 g/cm³, the absorbs more energy (10.47 J) and withstands higher impact forces (2.08 N). These characteristics make the hybrid composite more suitable for impact-prone and water-sensitive applications.

This experiment was conducted to study drought tolerance in different genotypes of flax (Linum usitatissimum L.), including 10 breeding lines and five landraces. The genotypes were separately evaluated under two irrigation regimes based on 70 and 140 mm evaporation from class A Pan. The experiments were carried out in a randomized complete block design with three replications at the research farm of Isfahan University of Technology, in 2009. The results of analysis of variance showed that there were significant differences (P<0.01) among the genotypes for water stress indices and seed yield. According to the assessment of different water stress indices (SSI, STI, TOL, GMP and MP) STI seems to be the most suitable index for recognizing the more drought tolerant genotypes. Based on STI index, Chaharmahal landrace was the most tolerant genotype and the breeding line of KO10 was the most sensitive one. Seed yield for Chaharmahal landrace was 1468 and 1335 kg/ha while genotype KO10 produced 527and 111 kg/ha in the first and second irrigation treatments, respectively.

Polylactic acid (PLA) is a well-known renewable and biodegradable polymer but is still limited by its low heat distortion temperature and brittleness. In this study, a PLA/flax composite containing flax fiber strands (5 wt%) was prepared through melt-compounding process followed by gamma irradiation at doses ranging from 0 to 20 kGy in the presence of a small amount of triallyl isocyanurate (TAIC) as cross-linking agent. The gel fraction of the composite was tested, and the datum showed that the gel fraction sharply increased first, and then slightly decreased with increasing irradiation dose. Gamma irradiation induced cross-linking of the polymer to form a three-dimensional network in the PLA/flax composite system. Irradiated composite could only swell instead of dissolving completely in chloroform, and the swollen morphology correlated with irradiation dose. The thermal stability of the PLA/flax composite was characterized using thermogravimetric analysis (TGA) temperature, and dimensional stability. Overall, irradiation modification improved the thermal resistance and dimensional stability of PLA composites. The mechanical property tests of the irradiated composites revealed increased tensile and impact strengths, reduced elongation-at-break, and unchanged tensile modulus. The analysis of water absorption of the composite demonstrated that the irradiation cross-linking induced no obvious effect on water absorption. Irradiation cross-linking modification cannot change the hydrophilicity or hydrophobicity of PLA composites. Overall, these findings look promising for future use in reinforcement and improvement of the thermal resistance of PLA/flax composites.

Background: Linseed (seed of flax) contains high amounts of 00-3 Fatty acids, whichis said to have antihyperlipidemic effects.Materials and Methods: In this study, blood lipid levels (Triglycerids, Cholesterol, LDL, HDL) of 56 hyperlipidemic patients were measured before and after Linseed administration (6 gr linseed powder daily as a biscuit formulation for 3 months as a supplementation to their simple diet). The results were analyzed by t-test using SPSS software.Results: There were some decreases in the mean level of serum total cholesterol (about 10% decrease, P=0.001), mean serum triglyceride (about 12% decrease, P=0.001), and mean serum LDL (about 10% decrease, P=0.001) before and after Linseed administration. The total- Cholesterol/HDL and LDL/HDL ratios decreased concordantly as well. However, there was no significant alteration in serum HDL level after linseed administration.Conclusion: Linseed administration combined with a simple diet, clinically decreases blood lipid levels. Hence, supplementation of simple diet with 6 gr Linseed powder daily, seems to be helpful in reducing patients blood lipid levels.

New-edible oil genotypes of flax can have contribution in oil seed production. Powdery mildew (Oidium lini) is one of the flax diseases Isfahan region that completely infect the crop. The objective of this study was to investigate the effect of controlling the disease on seed yield and other agronomic traits of flax. In this study, 8 edible-oil genotypes along with a landrace variety of regular flax were evaluated in two adjacent experiments using randomized complete block design with 4 replications. In one of the experiment, the disease was completely controlled by spraying with Calixin in 3 times with interval of 15 days. However, in the other experiment, there was no controlling of the disease and the plants were infected in natural field conditions. The results showed that spraying with fungicide had a significant effect only on plant height (P<0.01) and 100-seed weight (P<0.05). Plant height and 100-seed weight (P<0.05). Plant height and 100-seed weight was decreased and increased, respectively due to spraying. There was no significant interaction effect between spraying and genotypes for any trait. Base upon the results of this experiment, the occurrence of powdery mildew at the final stages of growth in flax and at Isfahan climatical conditions, had no significant negative effect on agronomic traits such as seed yield.

The article presents the main trends of weed floristic composition change in flax crops, associated with the development of agrotechnical methods of this crop cultivation. It is shown that the development of scientific and technical support for the flax industry contributes to a more complete satisfaction of culture with all factors of life and enhances its competitive ability. So, the phytocenotic role of many segetal weeds present in crops decreases, up to their complete loss from agrophytocenosis. They considered the actual weediness of flax crops and the biological effectiveness of various preparations and their compositions to prevent weeds.

In order to determine the optimum sowing date of different medicinal flax genotypes, a split plot experiment with completely randomized block design with 12 treatments and 4 replications were conducted at experimental farm of Yasooj Islamic Azad University. The treatments were composed of four different combinations of sowing dates ((Feb. 20, Mar. 6, Mar. 21, and Apr. 4) and 3 flax cultivars (Somaco, India, and Foster). The studied traits were as follows: plant height, 1000-kernel weight, harvest index, grain yield, Biological yield, Leaf Area Index, Crop Growth Rate and Relative Growth Rate. The results showed that there is a significant effect of between various sowing dates regarding the plant height, biological yield, Relative Growth Rate, Net Photosynthesis Rate, Leaf Area Index, grain yield, and 1000-kernel weight and for harvest index. Besides, the analysis of the data variance shows that there is a significant effect of between investigated genotypes regarding the plant height, biological yield, Crop Growth Rate, Relative Growth Rate, Leaf Area Index, grain yield. According to the results of experiment, the first sowing date (Feb. 20) and Somaco cultivar are recommended as the suitable for higher grain yield.