Quantity and transmission efficiency of an isolate of the Potato virus Y–Wilga (PVYN−Wi) by aphid species reared on different host plants     

Kamangar  Saman Bahrami  Taning  Clauvis Nji Tizi  De Jonghe  Kris  Smagghe  Guy 《植物病害和植物保护杂志》2019,126(6):529-534

Journal of Plant Diseases and Protection - Potato virus Y (PVY) is a destructive plant virus causing important damage in different crops, particularly in potato. PVY is transmitted in a...  相似文献   

Correlations between circulating insulin-like growth factor-I and thyroxine and cortisol hormone levels,and some biometrical traits in female brood stocks during the late stages of sex maturation and in juvenile Persian sturgeon (<Emphasis Type="Italic">Acipenser persicus</Emphasis>)     

Barzan Bahrami Kamangar  Mohammad Javad Rasaee  Bagher Mojazi Amiri  Behrouz Abtahi  Mahmoud Bahmani 《Fish physiology and biochemistry》2007,33(3):249-257

Relationships between insulin-like growth factor-I (IGF-I) and thyroxine (T4) and cortisol hormones were studied in female brood stocks of Persian sturgeon [Acipenser persicus; caught from both sea water (SW) and fresh water (FW)] during late stages of sex maturation. A number of biometrical traits were also studied that could represent the reproductive and/or growth states of brood stocks, and the possible relationship between IGF-I and growth was assessed in juvenile Persian sturgeons between 1 and 4 years of age. IGF-I, T4 and cortisol were measured in serum samples using commercially available kits. A four-parameter logistic model test was performed between the standard curves and the sample dilutions for each hormone. Parallelism, linearity and regression coefficients for the linearized standard curves and serial dilutions of samples were not significantly different (P < 0.05). Serum IGF-I levels in the juveniles were higher than those in the SW brood stocks, and cortisol levels in the former were lower than those in both brood stocks (P < 0.05). T4 levels in serum samples of juveniles were below the detectable level. IGF-I concentrations in juveniles were correlated with total weight, total length and fork length, but they did not increase significantly with increasing age from 1 to 4 years old (P < 0.05). Compared with SW brood stock, the FW brood stock was younger, had a smaller girth, smaller polarization index and higher ova diameter (P < 0.05). There were no differences between IGF-I and T4 levels in the two brood stocks, but cortisol levels were significantly higher in the FW brood stock. Percentage of fertilization was correlated with serum IGF-I in both brood stocks (P < 0.05). Our results support a role for IGF-I during the juvenile growth and reproductive physiology in female brood stocks of the Persian sturgeon.  相似文献   

Spectrophotometric determination of vitamin A in oils and fats   总被引：1，自引：0，他引：1  

T Kamangar  A B Fawzi 《Journal of the Association of Official Analytical Chemists》1978,61(3):753-755

A spectrophotometric method for determining vitamin A based on interaction with 50% trichloroacetic acid solution in dichloromethane was developed. The blue reaction product had a maximum absorption at 620 nm and obeyed Beer's law over the concentration range of 0.5-5.0 microgram retinol/ml solution. The molar absorptivity of the reaction product was 1.58 X 10(5). As much as 100 microgram vitamin D2, and beta-carotene up to 12 times the vitamin A concentration, did not interfere with the determination. The results obtained from the determination of vitamin A in cod liver oil and butter showed excellent agreement with the Carr-Price method, 43.013(d).  相似文献