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71.
72.
Mahmoudi Bizhan Fayazi Jamal Roshanfekr Hedayatollah Sari Mohsen Bakhtiarizadeh Mohammad Reza 《Veterinary research communications》2020,44(1):19-27
Veterinary Research Communications - Sub-acute ruminal acidosis is a type of metabolic disorder in which affected cattle show a considerable depression of rumen pH. This leads to a dramatic decline... 相似文献
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Eldessouki Elsayed A. A. Diab Amany M. Selema Talal A. M. Abo Sabry Nader M. Abotaleb Mahmoud M. Khalil Riad H. El-Sabbagh Nasser Younis Nehal A. Abdel-Tawwab Mohsen 《Aquaculture International》2022,30(4):1869-1887
Aquaculture International - Astaxanthin (AX) is one of the commonly used feed supplements to enhance the growth performance and provide antioxidant and immune functions of several aquatic animals.... 相似文献
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Phosphorus leaching in a calcareous soil treated with plant residues and inorganic fertilizer 总被引:3,自引:0,他引:3
Column experiments were conducted over 45 d to determine the degree of P mobility. The sandy loam soil was spiked with 200 mg P kg–1 and 5% organic residues. The treatments included: control without any water‐soluble P and plant residues, potato, wheat, water‐soluble P fertilizer, wheat + water‐soluble P, and potato + water‐soluble P. Each column was leached with distilled water, and leachates were collected and analyzed for P, K+, Ca2+, Mg2+, along with pH and EC. Sequential extraction was performed on soil samples at the end of leaching column experiments. The relatively high initial concentration of P in the leachates decreased to more stable values after 15 d which can be attributed to the colloid‐bound P. The P concentrations in the leachates fluctuated between 8 and 220 mg L–1 in the water‐soluble–P fertilizer treatment, between 0.80 and 230 mg L–1 in the potato + water‐soluble‐P treatment, and between 0.90 and 214 mg L–1 in the wheat + water‐soluble P treatment. Leaching loss of P mainly occurred in the 15 d of leaching, accounting for 94%, 88%, and 65% of total P leached in wheat + water‐soluble‐P, potato + water‐soluble‐P, and water‐soluble‐P treatments, respectively. Maximum amount of P leached was found from an exponential kind model and was in the range 0.45 mg kg–1 to 125.4 mg kg–1 in control and potato + water‐soluble‐P treatments, respectively. Sequential extraction results showed that in control and amended soils the major proportion of P was associated with Ca. The leachate samples in all treatments were saturated with respect to hydroxyapatite, β‐tricalcium phosphate, and octacalcium phosphate up to 20 d of leaching, whereas they were undersaturated with respect to Mg‐P minerals through the entire leaching experiment. 相似文献
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We investigated the effects of land uses on P distribution and availability in selected calcareous soils under different management practices. KCl‐P (labile P), NaOH‐P (Fe‐Al‐bound P), HCl‐P (Ca‐bound P), and residual P (Res‐P) fractions at 0–30 cm depth were determined for soils planted to garlic, orchard, pasture, potato, leafy vegetables, and wheat. Trends in P distribution between chemical fractions were similar between land uses. Ca‐bound P was the most abundant P fraction in the soils, constituting between 61% and 78% of the total P, whereas P associated with labile was less abundant (< 2%). Soils under leafy vegetables and wheat along with pasture presented the highest and lowest values in all fractions of P, respectively. Labile P generally was highest for leafy vegetables and potato. Labile P and Fe‐Al‐bound P comprised < 1.4% and 8% of total P, respectively. Residual P ranged from ≈ 14% (potato and garlic) to 31% (pasture). Long‐term fertilization increased P allocation to inorganic fractions, as Ca‐bound P contained 78% of total P for potato and garlic and 74% for leafy vegetables but 61% for pasture. A strong positive correlation between labile P and Fe‐Al‐bound P (r = 0.534, p < 0.01), labile P and Ca‐bound P (r = 0.574, p < 0.01), Ca‐bound P and Fe‐Al‐bound P (r = 0.504, p < 0.01), Olsen‐P and CaCl2‐P (r = 0.821, p < 0.01) was found. Principal‐component analysis showed that the first four components accounted for most of the variation, 32.5%, 16.9%, 12.9%, and 7.9% of total variation, respectively. 相似文献
78.
Mohsen A. El-Guindy Abdelkhalek H. El-Sebae Mohamed R. S. El-Assar 《Pest management science》1981,12(6):653-661
An investigation was made of the action of the juvenile hormone analogues (JHAs) methoprene (ZR-515) and 3-[5-(4-ethylphenoxy)-3-methylpent-3-enyl]-2, 2-dimethyloxirane (R-20458), and the insecticides chlorpyrifos and methomyl, when applied, separately or in combination, to the late insect stages of susceptible (S) and aminocarb-resistant (Rm) strains of Spodoptera littoralis Boisd. Sixth-instar larvae of the Rm strain showed detectable levels of cross-resistance to chlorpyrifos, methomyl and R-20458. However, cross-resistance to methoprene was less pronounced in the Rm strain. Treatment of the same instar with the ED50 of methoprene produced an appreciable level of sterility in the S strain, but this level decreased in the Rm strain. Similar treatment with R-20458 caused a lower level of sterility in the S strain and the Rm strain was less affected. In the S strain, the ED25 of either chlorpyrifos or methomyl when applied simultaneously with the ED25 of R-20458, produced an antagonistic effect and the Rm strain was more capable of resisting the joint action of these compounds. The treatment, ED25 chlorpyrifos + ED25 methoprene produced an additive effect on the S strain, while the Rm strain tolerated their combined action. Nevertheless, the treatment, ED25 methomyl + ED25 methoprene produced additive effects on both the S and Rm strains. The prepupae of the Rm strain tolerated the action of the insecticides methomyl and chlorpyrifos. A similar pattern of cross-resistance was also detected against the action of the two hormones at the ED25 level, while at the ED25 level, both the S and Rm strains were almost equally sensitive to the action of the two juvenoids. Chlorpyrifos-JHA combinations produced additive effects on prepupae of the S strain while the Rm strain completely resisted their joint action. Methomyl-JHA combinations produced high potentiation in the S strain, but the Rm strain remained insensitive to their joint action. Detectable levels of tolerance to the action of chlorpyrifos and methomyl at the ED25 and ED50 levels were indicated in 2-day-old pupae of the Rm strain. This was less evident in the case of JHAs, particularly methoprene, which was to some extent equally effective on both strains; the reproductive ability of the S and Rm strains was highly affected by this compound. The pupae of the Rm strains were equally as affected as those of the S strain by the combination ED25 chlorpyrifos+ ED25 R-20458. Nevertheless, the two strains showed antagonism to the action of chlorpyrifos with methoprene. A high level of potentiation was produced in the S strain to the combination of methomyl and R-20458 but the Rm strain was able to withstand their combined action. Of interest in this respect was the action of the combination of methomyl and methoprene, for which high levels of potentiation were detected in pupae of the S and Rm strains. This combination also Produced a high percentage of sterility in mated females of the Rm strain. 相似文献
79.
Mohamadi Yalsuyi Ahmad Forouhar Vajargah Mohammad Hajimoradloo Abdolmajid Mohammadi Galangash Mohsen Prokić Marko D. Faggio Caterina 《Veterinary research communications》2022,46(2):389-396
Veterinary Research Communications - Industrial chemical solutions are widely used as a method to disinfection of aquaculture water and environments. The aim of the present study was to evaluate... 相似文献
80.
Atta Akbari Omid Moini Jazani Mohammad Reza Saeb Kobra Pourabdollah Fariba Soltanolkottabi 《Fibers and Polymers》2014,15(6):1230-1235
A proper collector is designed and examined in electrospinning process to produce electrospun nanofibers with favored mechanical propertied. The quality of product was controlled by changing and optimizing the process variables, namely electrospinning time, gap distance, and collector rotating speed in a manner that well-aligned yarns were fabricated from polyacrylonitrile (PAN) dilute solutions. It was found that the tensile characteristics of fabricated yarns are greatly dependent on the process variables. Incorporation of multi-walled carbon nanotubes (MWCNTs) into the polymer solution revealed improvement to the yarn strength because of enhancement in alignment of the filaments. The state of fiber alignment and dispersion of MWCNTs were detected by means of scanning electron microscopy. It was illustrated that combination of nanofibers and microfibers gives PAN/MWCNTs composite nanofibers with high surface area and high porosity to satisfy sophisticated users. 相似文献