http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Histological study on the effect of nicotine on adult male guinea pig thin skin
Sohair A. Eltony,Safaa S. Ali 대한해부학회 2017 Anatomy & Cell Biology Vol.50 No.3
obacco smoking has been identified as an important factor in premature skin aging to detect the histological changes occurred in adult male guinea pig thin skin under the influence of low and high doses of nicotine; which constitutes approximately 0.6%-3.0% of the dry weight of tobacco. Fifteen adult male pigmented guinea pigs were equally divided into three groups: group I, control; group IIA, low dose nicotine treated; 3 mg/kg subcutaneously for 4 weeks; and group IIB, high dose nicotine treated; 6 mg/kg subcutaneously for 4 weeks. Specimens from the back thin skin were processed for light and electron microscopy. Nicotine administration revealed flattened dermo-epidermal junction and reduced rete ridges formation. Collagen bundles were disorganized with increased spaces between them. A reduction in the amount of elastic fibers in the dermis were also observed compared to group I. Ultrastructurally, keratinocytes had hyperchromatic nuclei, intracytoplasmic vacuoles, disruption of desmosomal junctions, irregular tonofilaments distribution, and increased inter-cellular spaces. These changes were more pronounced with high dose nicotine administration. The epidermal thickness was reduced in low dose nicotine administration. But, high dose nicotine administration revealed increased epidermal thickness compared to the control group. Nicotine induced structural changes of adult male guinea pig thin skin. These changes were more pronounced with high dose nicotine administration.
Metformin treatment confers protection of the optic nerve following photoreceptor degeneration
Sohair A,Eltony,Heba S,Mohaseb,Manal M,Sayed,Amel A,Ahmed 대한해부학회 2021 Anatomy & Cell Biology Vol.54 No.2
Acquired or inherited or photoreceptor loss causes retinal ganglion cell loss and ultimately axonal transport alteration. Thus, therapies should be applied early during photoreceptors degeneration before the remodeling process reaches the inner retina. This study aimed to evaluate the protective effect of metformin on the rat optic nerve following photoreceptors loss induced by N-Ethyl-N-nitrosourea (ENU). Eighteen adults male Wistar rats were divided into two groups. Group I: normal vehicle control (n=6). Group II: ENU-induced photoreceptors degeneration (n=12) received a single intraperitoneal injection of ENU at a dose of 600 mg/kg. Rats in group II were equally divided into two subgroups: IIa: photoreceptor degeneration induced group and IIb: metformin treated group (200 mg/kg) for 7 days. Specimens from the optic nerve were processed for light and electron microscopy. In ENU treated group, the optic nerve revealed reduction in the diameter of the optic nerve fibers and thinning of myelin sheath with morphological changes in the glia (astrocytes, oligodendrocytes, and microglia). Caspase-3 (apoptotic marker), iNOS (oxidative stress marker) and CD68 (macrophage marker) expression increased. In metformin-treated group, the diameter of optic nerve fibers and myelin sheath thickness increased with improvement of the deterioration in the glia. Caspase-3, iNOS and CD68 expression decreased. Metformin ameliorates the histological changes of the rat optic nerve following photoreceptors loss induced by ENU.
Removal of Reactive Blue 19 dye from Aqueous Solution Using Natural and Modified Orange Peel
Sohair A. Sayed Ahmed,Laila B. Khalil,Thoria El-Nabarawy 한국탄소학회 2012 Carbon Letters Vol.13 No.4
Orange peel (OP) exhibits a sorption capacity towards anionic dyes such as reactive blue 19 (RB19). Cetyltrimethylammonium bromide (CTAB) as a cationic surfactant was used to modify the surface nature of OP to enhance its adsorption capacity for anionic dyes from an aqueous solution. Four adsorbents were investigated: the OP, sodium hydroxide-treated OP (SOP), CTAB-modified OP and CTAB-modified SOP. The physical and chemical properties of these sorbents were determined using nitrogen adsorption at 77 K and by scanning electron microscope and Fourier transform infrared spectroscopy techniques. The adsorption of the RB19 dye was assessed with these sorbents at different solution pH levels and temperatures. The effect of the contact time was considered to determine the order and rate constants of the adsorption process. The adsorption data were analyzed considering the Freundlich, Langmuir, Elovich and Tempkin models. The adsorption of RB19 by the assessed sorbents is of the chemisorption type following pseudo-first-order kinetics. CTAB modification brought about a significant increase in RB19 adsorption, which was ascribed to the grafting of the sorbent with a cationic surfactant.
Rowaida Saleh Ahmed,Sohair M. Gadalla 한국응용곤충학회 2005 Journal of Asia-Pacific Entomology Vol.8 No.3
This study is the fifth part of a series on Gerromorpha from Egypt. It includes a taxonomic review of family Veliidae that was recorded from Egypt with references to their habitats and distribution. Two genera: Microvelia Westwood & Rhagovelia Mayr and 6 species: M. gracillima Reuter; M. popovi Brown; M. macani Brown; M. pygmaea (Dufour); M. waelbroecki Kirkaldy & R. nigricans (Burmeister) are confirmed from Egypt. Microvelia macani Brown was recorded from Africa and Egypt for the first time. Keys for the identification of the subfamilies, genera and all species are given. Illustrations, and scanning electron microphotographs are provided.
Ahmed Rowaida Saleh,Gadalla Sohair M. Korean Society of Applied Entomology 2005 Journal of Asia-Pacific Entomology Vol.8 No.4
This study is the conclusion of a planned series on Gerromorpha from Egypt. A list of Gerromorpha is given with notes on their habitats and distribution. A total of 5 families, 9 genera and 20 species are recorded from Egypt, of which Gerris costae Herrich-Schaeffer (Gerridae) is described as new to Egypt.
Ahmed Rowaida Saleh,Gadalla Sohair M. Korean Society of Applied Entomology 2005 Journal of Asia-Pacific Entomology Vol.8 No.3
This study is the fifth part of a series on Gerromorpha from Egypt. It includes a taxonomic review of family Veliidae that was recorded from Egypt with references to their habitats and distribution. Two genera: Microvelia Westwood & Rhagovelia Mayr and 6 species: M. gracillima Reuter; M. popovi Brown; M. macani Brown; M. pygmaea (Dufour); M. waelbroecki Kirkaldy & R. nigricans (Burmeister) are confirmed from Egypt. Microvelia macani Brown was recorded from Africa and Egypt for the first time. Keys for the identification of the subfamilies, genera and all species are given. Illustrations, and scanning electron microphotographs are provided.
Heba K,Mohamed1,Sohair A,Eltony 대한해부학회 2020 Anatomy & Cell Biology Vol.53 No.1
Epilepsy is one of the most common neurological disorders, its prevalence approximately from 0.5% to 2% of the general population. Generalized seizures could lead to several morphological changes in the brain. This study aimed to investigate the morphological effects of a single convulsive dose of pentylenetetrazol (PTZ) on rat dentate gyrus at different postnatal ages. Thirty-six male Wistar rats were used at the following postnatal ages: P10, P21, and P90 (12 rats per each age). The animals in each age were equally divided into two groups: group I, control and group II, treated with a single intraperitoneal injection of PTZ (55 mg/kg). After confirmation of generalized tonic-clonic seizures, specimens from the right dentate gyrus were processed for light and electron microscopy. In PTZ-treated groups, the number of granule cells significantly decreased. Dark granule cells appeared in the deep layers of the granule cells in P10 and with the progress of age, they significantly increased in number and extended into the superficial layers of the granule cells. The dendritic spines diminished. Glial fibrillary acidic protein and caspase-3 expression increased. Ultrastructurally, granule cells showed irregular shaped nucleus, dilated rough endoplasmic reticulum (RER) cisternae, mitochondria with damaged cristae, large vacuoles, lysosomes, and lipofuscin granules. Dark granule cells characterized by electron-dense nucleus and cytoplasm containing disorganized Golgi bodies, swollen mitochondria with damaged cristae, numerous free ribosomes and few long strands of RER. Astrocytes had hypertrophied cell body. Acute treatment with PTZ-induced epileptic seizures caused toxic effect on the structure of rat dentate gyrus at different postnatal ages.
Rowaida Saleh Ahmed,Sohair M. Gadalla 한국응용곤충학회 2005 Journal of Asia-Pacific Entomology Vol.8 No.4
This study is the conclusion of a planned series on Gerromorpha from Egypt. A list of Gerromorpha is given with notes on their habitats and distribution. A total of 5 families, 9 genera and 20 species are recorded from Egypt, of which Gerris costae Herrich-Schaeffer (Gerridae) is described as new to Egypt.