Effect of mating on egg production in two species of predatory mites,Agistemus exsertus Gonzalez andPhytoseiulus persimilis Athias — Henriot     

Prof. Dr. Aly H. Rasmy  H. E. Hussein 《Journal of pest science》1996,69(4):88-89

The influences of single and multiple matings on egg production in the two predacious mitesAgistemus exsertus Gonz. andPhytoseiulus persimilis Ath. — Hen. were investigated in the laboratory. with both species egg production was increased as a result of multiple matings, but this increase was insignificant. In addition, mated females ofA. exsertus commenced oviposition one day earlier compared to unmated ovipositing females.With 1 table  相似文献   

Xanthone isolated from Securidaca longependunculata with activity against erectile dysfunction     

Rakuambo NC  Meyer JJ  Hussein A 《Fitoterapia》2004,75(5):497-499

1,7-Dimethoxy-2-hydroxy-xanthone and 1,4-dihydroxy-7-methoxy-xanthone isolated from Securidaca longependunculata were tested for their activity on rabbit corpus cavernosum in vitro. Only the former relaxed the corpus cavernosum by 63% at 1.8 x 10(-5) mg/ml.  相似文献   

<Emphasis Type="Italic">Salmonella</Emphasis> Umbadah: A new <Emphasis Type="Italic">Salmonella</Emphasis> serovar isolated from cattle in Sudan     

H. E. H. Hag Elsafi  M. M. Nor Elmadiena  A. A. El Hussein  M. A. M Siddig  C. A Muckle  L. Cole  E. Wilkie  K. Mistry 《Tropical animal health and production》2009,41(7):1605-1606

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Acaricidal effects of cardiac glycosides, azadirachtin and neem oil against the camel tick, Hyalomma dromedarii (Acari: Ixodidae)     

Al-Rajhy DH  Alahmed AM  Hussein HI  Kheir SM 《Pest management science》2003,59(11):1250-1254

The cardiac glycoside, digitoxin, from Digitalis purpurea L (Scrophulariaceae), a cardiac glycosidal (cardenolide) extract from Calotropis procera (Ait) R Br (Asclepiadaceae), azadirachtin and neem oil from Azadirachta indica A Juss (Meliaceae) were tested for their effects against larvae and adult stages of the camel tick, Hyalomma dromedarii Koch (Acari: Ixodidae). The contact LC50 values of the first three materials against adults were 4.08, 9.63 and >40.7 microg cm(-2), respectively, whereas the dipping LC50 values of the four materials were 409.9, 1096, >5000 and >5000 mg litre(-1), respectively. Contact and dipping LC50 values of the extract and azadirachtin against larvae were 6.16, >20.3 microg cm(-2) and 587.7 and >2500 mg litre(-1), respectively. Azadirachtin had no effects on egg production or feeding of adults up to 5000 mg litre(-1); however at 2500 mg litre(-1), it caused significant reduction in feeding activity of larve, prolonged the period for moulting to nymphal stage, and caused 60% reduction in moultability. Results of the two cardiac glycoside materials are comparable with those of several commercial acaricides. The risks and benefits associated with the use of cardiac glycosides are considered.  相似文献   

Growth characters and chemical constituents of Dracocephalum moldavica L. plants in relation to compost fertilizer and planting distance     

M.S. Hussein  S.E. El-Sherbeny  M.Y. KhalilN.Y. Naguib  S.M. Aly 《Scientia Horticulturae》2006

Two experiments were carried out during two successive seasons to investigate the response of Dracocephalum moldavica L. (dragonhead) to various plant densities and compost applications. Compost levels had a promoting influence on most of vegetative growth parameters and accelerated essential oil accumulation and chemical constituents including total carbohydrate and photosynthetic pigments content. Similarly, wider plant spacing showed the greatest effect on growth components and chemical constituents. Generally, the maximum rate of compost (39.6 t/ha) combined with wider distance between plants (40 cm) had a favorable effect on most of growth characters. The same treatment gave the highest mean value for essential oil yield during the first season while the same compost rate combined with the medium distance (30 cm) gave the highest value during the second season. The main constituent of the essential oil was linalool followed by geranial. On the other hand, compost levels combined with different distances had a pronounced effect on the various essential oil constituents. It can be decisived that there is no significant difference between wider distance (40 cm) and medium one (30 cm); so, it can be recommended to apply the maximum level of compost (39.6 t/ha) combined with medium distance.  相似文献   

Carbohydrate fermentation and nitrogen metabolism of a finishing beef diet by ruminal microbes in continuous cultures as affected by ethoxyquin and(or) supplementation of monensin and tylosin     

Han H  Hussein HS  Glimp HA  Saylor DH  Greene LW 《Journal of animal science》2002,80(4):1117-1123

Long-term feedlot studies have shown positive effects (i.e., improved ADG and reduced morbidity and mortality) of dietary supplementation with ethoxyquin (AGRADO). This may be due to improving the antioxidant capacity at the ruminal, postruminal, or postabsorption levels. This study was designed to investigate the role of ethoxyquin at the rumen level. A finishing diet (12.5% CP; DM basis) was formulated to contain (on a DM basis) 77.5% flaked corn, 10% corn cobs, 10% protein/vitamin/mineral supplement, and 2.5% tallow. In a randomized complete block design experiment, the treatments were arranged as a 2 x 2 factorial. The main factors were two ethoxyquin treatments (without or with 150 ppm) and two monensin/tylosin treatments (without or with monensin and tylosin at 0.0028 and 0.0014% of dietary DM, respectively). Eight dual-flow, continuous culture fermenters were used in two experimental periods (blocks; 8 d each with 5 d for adjustment and 3 d for sample collection) to allow for four replications for each treatment. No interactions (P > 0.05) were detected for any of the measurements evaluated. Therefore, results of the main factors were summarized. Ethoxyquin supplementation improved (P < 0.05) true digestibility of OM (from 38.8 to 45.0%) but it did not alter (P > 0.05) concentrations of total VFA (averaging 131 mM) or acetate (averaging 58.8 mM). Ethoxyquin decreased (P < 0.05) propionate concentration from 51.1 to 42.4 mM and increased (P < 0.05) butyrate concentration from 18.4 to 22.9 mM. Digestion of total nonstructural carbohydrates was not altered (P > 0.05) by the treatments and averaged 86%. With the exception of increased (P < 0.05) concentration of propionate (from 42.0 to 51.5 mM) and decreased (P < 0.05) concentration of butyrate (from 25.9 to 16.3 mM), no effects (P > 0.05) were detected for monensin/tylosin. Ruminal N metabolism, including efficiency of bacterial protein synthesis (averaging 21.2 g N/kg OM truly digested), was not affected (P > 0.05) by the treatments. Results suggest positive effects of ethoxyquin on ruminal digestion of OM and unique changes in VFA production.  相似文献   

Brucella sero-activity in Somali goats     

S. Falade  A. H. Hussein 《Tropical animal health and production》1979,11(1):211-212

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Pulmonary fascioliasis in Sudanese cattle     

M F Hussein  E M Haroun 《The British veterinary journal》1977,133(3):316-317

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The distribution of ixodid ticks (Acari: Ixodidae) in central Ethiopia     

Mekonnen S  Hussein I  Bedane B 《The Onderstepoort journal of veterinary research》2001,68(4):243-251

Ixodid ticks were collected from domestic animals, mainly cattle, in 11 administrative zones covering 84 districts in central Ethiopia over a period of 2 years (July 1996 to June 1998). Nineteen tick species were identified. Four of these belonged to the genus Amblyomma, one to Boophilus, two to Haemaphysalis, three to Hyalomma and nine to Rhipicephalus. Amblyomma variegatum and Rhipicephalus evertsi evertsi were present in all 11 administrative zones and, with the exception of Afar, Boophilus decoloratus was present in nearly every district in which collections were made. These three species constituted more than 50% of all ticks collected. Amblyomma cohaerens and Rhipicephalus bergeoni were common in the west of the survey region and Rhipicephalus pulchellus in the east. Except for B. decoloratus, of which more females than males were collected, the numbers of male ticks recovered were equal to or exceeded those of females. Mortality in crossbred dairy cattle caused by heartwater (Cowdria ruminantium infection) was reported during the survey period. An integrated approach to tick control is suggested.  相似文献   

The Crown Window — a simple device for measuring tree crowns     

Khalid A. Hussein  Klaus von Gadow  Matthias Albert 《European Journal of Forest Research》2000,119(1-6):43-50

The paper presents a new method for assessing crown radii at different tree heights, using a simple mechanical device, the crown window. The accuracy of the crown window measuring device is evaluated using measurement data from different objects. The device is easy to manufacture and proved to be more useful than other more sophisticated techniques, such as digital photo analysis or laser based instruments in estimating crown radii and their corresponding heights with acceptable accuracy.  相似文献