Noha Ahmed - Academia.edu (original) (raw)

Papers by Noha Ahmed

Fertility and Sterility, 2020

Encarsia Forester (Hymenoptera: Aphelinidae) species are some of the most important biological co... more Encarsia Forester (Hymenoptera: Aphelinidae) species are some of the most important biological control agents of armored scale insects (Hemiptera: Diaspididae) worldwide. The results of our studies indicate that there are 5 species of Encarsia associated with armored scale insects in Egypt: Encarsia aurantii (Howard), E. berlesei (Howard), E. citrina (Craw), E. lounsburyi (Berlese & Paoli) and E. perniciosi (Tower). The seasonal abundance of these five species was observed on four crops infested with five armored scale insect species in five governorates of Egypt in 2011 and 2012. Results indicate that E. au- rantii had the highest effective rates of parasitism on Parlatoria oleae (Colvee), reaching 40.2 and 45.2% respectively in the two years of the investigation. The comparable maximum parasitism rates for the other species were: E. citrina 33.2 and 26.4% on Parlatoria ziziphi (l ucas ), E. berlesei 28.4 and 26.4% on Pseudaulacaspis pentagona (Targioni Tozzetti), E. lounsburyi 19....

Egyptian Journal of Agricultural Research, 2008

Ageing Research Reviews, 2020

Mitochondrial dysfunction is one of the hallmarks of aging. Consistently mitochondrial DNA (mtDNA... more Mitochondrial dysfunction is one of the hallmarks of aging. Consistently mitochondrial DNA (mtDNA) copy number and function decline with age in various tissues. There is increasing evidence to support that mitochondrial dysfunction drives ovarian aging. A decreased mtDNA

Pigment Cell & Melanoma Research, 2020

Pigmentation abnormalities are reported in the spectrum of phenotypes associated with aging and i... more Pigmentation abnormalities are reported in the spectrum of phenotypes associated with aging and in patients with mitochondrial DNA depletion syndrome (MDS). Yet, a relevant animal model that mimics these effects and would allow us to evaluate the detrimental aspects of mtDNA depletion on melanocyte function has not been described. Here, we characterize the pigmentary changes observed in the ears of a mtDNA-depleter mouse, which phenotypically includes accentuation of the periadnexal pseudonetwork, patchy hyper-and hypopigmentation, and reticular pigmentation. Histologically, these mice show increased epidermal pigmentation with patchy distribution, along with increased and highly dendritic melanocytes. These mtDNA-depleter mice mimic aspects of the cutaneous, pigmentary changes observed in humans with age-related senile lentigines as well as MDS. We suggest that this mouse model can serve as a novel resource for future interrogations of how mitochondrial dysfunction contributes to pigmentary skin disorders. The mtDNA-depleter mouse model also serves as a useful tool to identify novel agents capable of treating pigmentary changes associated with age-related mitochondrial dysfunction in humans.

Egyptian Academic Journal of Biological Sciences. A, Entomology, 2012

Scale insects are the major pests infesting apple, apricot and pear trees in Egypt. The aim of th... more Scale insects are the major pests infesting apple, apricot and pear trees in Egypt. The aim of the present work is to study a survey of scale insects infesting apple, apricot, pear trees and their abundant parasitoids in Egypt. A survey of scale insects infested apple, apricot, pear trees and their abundant parasitoids were carried out all over Egypt during 2009-2011. The results indicated that apple, apricot and pear trees were infested by 19, 10 and 10 scale insect species and associated with 12,6 and 8 parasitoid species, respectively.

Egyptian Academic Journal of Biological Sciences. A, Entomology, 2010

The citrus mealy bug, Planococcus citri (Risso) (Hemiptera: Pseudococcidae) is attacks many host ... more The citrus mealy bug, Planococcus citri (Risso) (Hemiptera: Pseudococcidae) is attacks many host plants including all orchard trees in Egypt. The aim of this work is to study the survey of host plants, geographical distribution and natural enemies of the citrus mealy bug, P.citri in Egypt as well as the biological studies of this pest on citrus, grape and guava. The results indicated that the citrus mealy bug infested 65 plant species belonging to 56 genera in 36 families and distributed in 20 governorates. Twelve species of parasitoids were collected and recorded one of them is new record. This is Leptomastix abnormis Girault (Hymenoptera: Encyrtidae). Also nine species of predators recorded here attacked P.citri. The results also observed the host plants and temperatures greatly influenced on the development of P. citri. The lowering of the temperature increased the dimension of the mealy bug and lengthened the developmental period. The results on citrus, guava and grape showed that the life cycle of P. citri at 30 o C were 21.4±2.45, 32.6±2.44 and 38.8±1.56 days, respectively. These results indicated that P. citri preferes citrus followed by guava and grape.

The Journal of Basic & Applied Zoology, 2012

At present the nigra scale, Parasaissetia nigra (Nietner) and the cottony camellia scale Pulvinar... more At present the nigra scale, Parasaissetia nigra (Nietner) and the cottony camellia scale Pulvinaria floccifera (Westwood) (Hemiptera: Coccidae) are among the most important pests on guava and mango trees in Egypt. The present investigation was set up to study the effect of different compounds on P. floccifera and P. nigra on guava and mango trees, respectively. The results indicated that in the first season (2010), the treatment with different compounds (Biofly ''Beauveria bassiana'', Neemazal ''Azadirachta indica'', and Super Misrona oil) gave a moderate reduction of percent in the population of adult females and nymphs of P. nigra and P. floccifera respectively, as compared to Malathion and its mixture (''Super Misrona oil+Malathion'') which gave a higher reduction rate after the 1st, 2nd and 3rd weeks after spraying. Also, these compounds gave a moderate mortality to the parasitoids as compared to Malathion and its mixture (''Super Misrona oil+Malathion'') which gave higher toxicity after the 1st, 2nd and 3rd weeks after spraying. The data obtained in the second season (2011) were also similar to those obtained in the first season (2010). It can be concluded that treatment with Biofly, Neemazal and Super Misrona oil gave satisfactory control of different stages of P. nigra and P. floccifera and their parasitoids, Diversinervus elegans Silvestri, Metaphycus lounsburyi (Howard), Microterys flavus (Howard) and Coccophagus sp., Metaphycus zebratus Mercet, M. flavus , respectively, as compared to Malathion and its mixture ''Super Misrona oil+Malathion''.

Benha Veterinary Medical Journal, 2017

Sixty random samples of raw thigh & breast, half cooked chicken shawerma & shiesh tawook, fully c... more Sixty random samples of raw thigh & breast, half cooked chicken shawerma & shiesh tawook, fully cooked chicken shawerma and fully cooked chicken shiesh tawook (10 of each) were collected from different markets in Gharbia governorates and analyzed for biogenic amines by HPLC. The obtained results indicated that the mean values of histamine, cadaverine and putrescine (mg/100g) were 10.