Effect of insecticide poisoning of methoxychlor on the production of gonadotropin hormones in adult male rats

Background and aims: Methoxychlor pesticide is widely used to replace DDT. In this study, the possible effect of Methoxychlor was investigated on the hormone level of LH, FSH, testosterone, spermatogenesis and its possible role in male infertility. Methods: In this experimental study, 48 Wistar male rats were studied in six groups of 8. Different concentrations of the substance were injected in the experimental groups, i.e. 5, 50, 100, 500 and 1000 grams per liter per day. After 15 days, blood samples were taken and the levels of the hormone were checked. Normal distribution and statistical evaluation of data respectively was performed using ANOVA one-way analysis of variance and Paired t-test. P less than 0.05 were considered as statistically significant. Results: Results showed a significant decrease in the amount of FSH and testosterone concentrations in the experimental group injected 100, 500 and 1000 grams per liter Methoxychlor, but LH levels in groups of 500 and 1000 grams per liter Methoxychlor showed a significant decrease. Due to chlorine in the group 1000 mg per liter. The density of sperm cells in the center of the spermatogenesis tube in the experimental group which received 1000mg/lit methoxychlor decreased compared to the control group.s Conclusion: Methoxychlor causes male sexual imbalances by changing in LH, FSH hormones concentrations, sperm condense, body and tastes weigh

Antibacterial Effect of CrO and CoFe2O4 Nanoparticles upon Staphylococcus aureus

Background & Objectives: The use of metal oxide nanoparticles can be effective to eliminate the bacterial infections, as an alternative to antibiotics. In this study, antibacterial properties of nonmaterials of CrO and CoFe2O4 are investigated against Staphylococcus aureus as a major and prevalent pathogenic bacterium to achieve sterile nano-containers. Materials & Methods: Different concentrations of CrO and CoFe2O4 nanoparticles, (0.2, 0.4, 0.6, 0.8, and 1%) of each, were examined with respect to their optical density (OD) culture separately. Different percentages of each nanoparticles were also examined together for the best antibacterial combination. Kinetics of Bactericidal of nanoparticles were calculated in two-hour periods and were compared with the power of other common antibiotics. Ratios of MIC/MBC were calculated by Micro dilution method, to demonstrate the bactericidal power of nanoparticles. Results: The best concentration of the nanoparticles with the highest effect of bactericidal was obtained in the presence of 1% concentration of CrO that the OD of S. aureus culture medium had reduced 4/6 times than the control group (p<0/001).Ratio of 70% CrO to 30% CoFe2O4 was the best of the Bacteriostatic properties that OD was reduced 3/3 times than the control group (p<0/05). Best kinetics of bactericidal with survival rate in the presence of 1% CrO and CoFe2O4 were obtained in 24 and 36 hours respectively. In critical concentration of 1% CrO and CoFe2O4 bactericidal power was about 67 and 56 % respectively. The MIC/MBC rate for CrO and CoFe2O4 was obtained 0/2 and 0/4 respectively. Conclusion: The results showed that CrO nanoparticle compared with CoFe2O4 has a higher bactericidal power for S. aureus infection. Therefore, by completion of these experiments and the use of metal oxide nanoparticles complex in sensitive environments such as food storage containers, etc. are suggested

Thermal properties of conductive nanocomposite core-shell filament yarns

380-386<span style="font-size:9.0pt;mso-fareast-font-family:SimSun;mso-bidi-font-family: " times="" new="" roman";mso-fareast-language:zh-cn;mso-bidi-language:th"="" lang="EN-GB">Thermal properties of conductive nanocomposite core-shell filament yarns have been investigated as a structure of a textile for the purpose of generating heat from an electrical power source. A fine copper monofilament is coated with a composite of polypropylene and various filler content of copper nanoparticles by an injection molding process to study the thermal properties of yarn as a function of filler shell content. Electrical analogy of Fourier’s law in thermal circuit has been used for development of a theory for thermal parameters. Then theoretical approaches are compared with modeling results obtained by ANSYS software and experimental results. Results reveal that although increase in filler content causes an increase in electrical and thermal conductivity of composite shell of yarn, heat generation in shell is negligible compared to that in core. Furthermore, results reveal that optimum value of filler fraction for desirable heat transfer is achieved at = 0.065. </span