Laboratory studies on the efficacy of some molluscicides on Egyptian snails     

M S Abdel-Rahman  M M Fahmy  M M el Bahi 《DTW. Deutsche tier?rztliche Wochenschrift》1988,95(5):205-207

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Seasonal changes in breeding activity, testicular size, testosterone concentration and seminal characteristics in rams with long or short breeding season     

J J Dufour  M H Fahmy  F Minvielle 《Journal of animal science》1984,58(2):416-422

Breeding activity (libido), testicular size, testosterone levels and seminal characteristics of 10 DLS adult rams (a population of 1/2 Dorset, 1/4 Leicester and 1/4 Suffolk selected for extended breeding season) were compared with those of 10 adult Suffolk rams. The study lasted 18 mo during which the data were recorded over 30 collection periods. All characteristics varied significantly with the season of the year, being lowest during the summer and highest during the fall. Suffolk rams had higher libido but lower testosterone levels than the DLS rams throughout the study. Testosterone increased earlier and decreased later in the breeding season in DLS compared with Suffolk rams, the interaction breed X period being significant. Testosterone concentration was highly associated with testicular size and libido, accounting for 65 and 28% of the variation in the Suffolk and 37 and 18% in the DLS rams, respectively. Seminal output and quality (motility and percentage of live spermatozoa) were highest in October and November and lowest in April and May. Rams within breeds differed significantly in the seminal characteristics studied. Results of the study showed that selecting the DLS ewes for extended breeding season may have altered the reproductive performance of the rams of that breed.  相似文献   

A comparison of the energy availability for chickens of ground and whole grain samples of two wheat varieties     

M. Salah Uddin  S. P. Rose  T. A. Hiscock  S. Bonnet 《British poultry science》1996,37(2):347-357

1. The objective of this study was to examine whether the energy availabilities of two wheat samples, which differed in endosperm hardness, were changed when they were fed ground or as whole grains to chickens. Wheat samples of a variety Haven (hard endosperm) and a variety Riband (soft endosperm), both harvested in 1993 from the same growing site, were used in the experiment.

2. True metabolisable energy (TME_n) was measured in a flock of 24 adult cockerels and the mean of all the samples was 14.68 MJ/kg dry matter (DM). The TME_n of ground wheat was 0.306 MJ/kg DM greater (P< 0.05) than whole grain. There was no significant difference (P> 0.05) in TME_n between the Riband and Haven wheat samples and there were no (P> 0.05) variety X wheat form interactions.

3. The apparent metabolisable energy (AME_n) of the wheat samples was determined with 96 broiler chickens from 19 to 27 d of age. Different amounts of either whole or ground wheat samples were added to a basal diet. Extrapolation of the regression lines indicated AME_n concentrations (MJ/kg DM) of ground Haven 14.33, whole Haven 14.28, ground Riband 14.33 and whole Riband 14.51. There was no evidence (P> 0.05) that whole grain wheat had a different AME_n than ground wheat.

4. A feeding trial used 192 broiler chickens in 48 cages from 24 to 42 d of age. They were fed on a broiler grower diet either mixed with ground wheat before pelleting or with the pelleted grower diet loosely mixed with the whole wheat. There were no differences (P> 0.05) between the 2 wheat varieties or the diet form in growth rates or food conversion ratios. The growth rates of the broilers given a conventional grower and finisher dietary regimen tended (P> 0.05) to be slightly greater than the broilers given the wheat‐diluted diets.  相似文献   

Alterations in transpiration and stem vascular tissues of two maize cultivars under conditions of water stress and late wilt disease   总被引：1，自引：0，他引：1  

M. F. Abd El-Rahim  G. M. Fahmy  & Z. M. Fahmy 《Plant pathology》1998,47(2):216-223

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Wheat Straw Burial Improves Physiological Traits,Yield and Grain Quality of Rice by Regulating Antioxidant System and Nitrogen Assimilation Enzymes under Alternate Wetting and Drying Irrigation     

Yousef Alhaj Hamoud  Hiba Shaghaleh  Wang Ruke  Willy Franz Gouertoumbo  Amar Ali Adam hamad  Mohamed Salah Sheteiwy  Wang Zhenchang  Guo Xiangping 《水稻科学》2022,29(5):473-488

Wheat straw burial has great potential to sustain rice production under alternate wetting and drying (AWD) irrigation. A field experiment was conducted with three wheat straw burial treatments, including without straw burial (NSB), with light straw burial of 300 kg/hm² (LSB) and dense straw burial of 800 kg/hm² (DSB), as well as three AWD regimes: alternate wetting/moderate drying (AWMD), alternate wetting/severe drying (AWSD) and alternate wetting/critical drying (AWCD). The rice growth and grain quality were higher in LSB and NSB than those in NSB under the same AWD regime. The AWMD × DSB treatment resulted in the highest yield, brown rice rate, milled rice rate, amylose content and protein content. Conversely, the AWCD × NSB treatment led to the lowest yield, brown rice rate, milled rice rate, amylose content and protein content. The active absorption area and nitrate reductase activity of roots were higher in the AWMD × DSB treatment than those in the AWCD × NSB treatment, as the former increased organic carbon and nitrogen contents in the rhizosphere, whereas the latter reduced their availability. Total soluble protein content and glutamine synthetase activity were greater in the AWMD × DSB treatment than those in the AWCD × NSB treatment. The activities of superoxide dismutase and catalase were higher in the AWMD × DSB treatment compared with the AWCD × NSB treatment, leading to the amelioration of oxidative cell injury, as shown by a lower malonaldehyde level. This study suggested that farmers should implement AWMD irrigation after leaving the straw residues in the field, followed by deep tillage to improve soil quality and mitigate the drought stress cycles of AWD. This approach can improve rice growth and grain quality and alleviate the problems of disposal of straw residues and water scarcity for sustainable rice production.  相似文献   

A Possible Mechanism of Action of the Chemopreventive Effects of Sarcotriol on Skin Tumor Development in CD-1 Mice     

Vipra Kundoor  Xiaoying Zhang  Sherief Khalifa  Hesham Fahmy  Chandradhar Dwivedi 《Marine drugs》2006,4(4):274-285

Sarcophine derivatives have been suggested to be chemopreventive in nature. One of its derivatives, Sarcotriol (ST), was investigated to study the skin cancer chemopreventive effects in female CD-1 mice. Three groups (control, promotion, initiation) of 30 female CD-1 mice each were taken. Carcinogenesis was initiated with 7, 12- dimethylbenz (a) anthracene (DMBA) and promoted with 12-O-tetradecanoylphorbol-13- acetate (TPA). One hour before treating with DMBA (200 nmol/100 μl acetone), control and promotion groups were treated with acetone (100 μl) and initiation group with ST (30μg/100μl of acetone). Beginning one week after initiation with DMBA, control and initiation groups were treated with acetone and promotion group with ST (30μg/100μl of acetone), one hour before treating with TPA (5 nmol/100 μl acetone). This was carried out twice a week for the next 20 weeks. The effects of ST on ³H-thymidine incorporation in epidermal DNA, the possible role of apoptotic proteins and COX-2 involved in the prevention of skin tumor development of CD-1 mice were investigated. Tumor incidence and multiplicity was found to be 100%, 73%, 100% and 8.2, 4.8, 9.7 in control, promotion and initiation groups respectively. ST treatment resulted in a significant (P < 0.05) inhibition in the incorporation of ³H-thymidine in epidermal DNA. The promotion group showed higher levels of caspase-3, -8 and –9 compared to the control. COX-2 expression was significantly lower (P < 0.05) in the promotion group as compared to the control. No significant difference in caspase-3, -8, -9 and COX-2 levels were observed in the initiation group compared to control. Together, this study confirms the chemopreventive effects of ST, and for the first time identifies the stage of carcinogenesis at which ST exerts its chemopreventive effect, and elucidates the mechanism possibly by inducing apoptosis and decreasing the COX-2 levels, contributing to its overall cancer chemopreventive effects in the mouse skin cancer model.  相似文献   

Microbiological study and insecticidal potential of purified extract from Streptomyces sp. on the larvae of Galleria mellonella     

Soliman  Mahmoud Abdel Wahab  Hamza  Ali Fawzy  Zahran  Nagwan Fahmy  Bassioni  Ghada 《植物病害和植物保护杂志》2021,128(6):1565-1574

Journal of Plant Diseases and Protection - In the present study, one Streptomyces species was isolated from a soil sample that was collected in Khafr El Shikh Governorate. Actinomycetes are...  相似文献   

Selective toxicity of N-substituted biscarbamoyl sulfides     

M A Fahmy  Y C Chiu  T R Fukuto 《Journal of agricultural and food chemistry》1974,22(1):59-62

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Structure-activity correlations in dDT analogs     

M A Fahmy  T R Fukuto  R L Metcalf  R L Holmstead 《Journal of agricultural and food chemistry》1973,21(4):585-591

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Crude oil dissolution in saline water     

Salah E. M. Hamam  Mohamed F. Hamoda  Habib I. Shaban  Amal S. Kilani 《Water, air, and soil pollution》1988,37(1-2):55-64

The solubilities and diffusion coefficients of crude oils having API° ranging from 11 to 28 have been measured in distilled and saline water of 44 g L^?1 NaCl at temperatures 25, 35, and 45 °C. A linear relationship was observed between the maximum oil solubilities in distilled water and those in saline water for all the crudes over the range of temperature studied. The Setschenow salting-out parameter was found to be 0.125 independent of temperature and API°. Such a parameter is valuable in estimating the crude oil solubilities in waters of different salinity. An analytical solution for unsteady-state diffusion was done using Fourier series. A linear relationship was found between the diffusion coefficients of oils in distilled water and those in saline water. Observed data for diffusion coefficients of the oils have been correlated in terms of API°, temperature and ionic strength with an average absolute deviation of 2%.  相似文献