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Papers by m shabana

Research paper thumbnail of Cryomicroscope investigation and thermodynamic modeling of the freezing of unfertilized hamster ova

Cryobiology, 1988

Thermodynamic computer modeling was used to predict the freezing response of single-celled unfert... more Thermodynamic computer modeling was used to predict the freezing response of single-celled unfertilized hamster ova. The cell membrane transport characteristics were investigated, using a microscope diffusion chamber system. The mean osmotically inactive cell volume was determined to be 21.6% of the initial cell volume. An overall mean value of 0.8 ? 0.1 pm3/pm2 . min . atm (= 18 * 2.5 &sec) was determined for the membrane hydraulic coefftcient, L,. The effect of the extracellular solute concentration on L, was determined at room temperature (-23°C). A thermodynamic computer model was used to predict the cell response to freezing. The predicted response was compared to the actual volumetric response observed during freezing on a temperature-controlled cryomicroscope conduction stage. The effect of the cooling rate on the nucleation temperature of unprotected ova and protected ova suspended in a 1.5 M DMSO solution was investigated. Overall mean nucleation temperatures of -13 and -57.l"C were observed for unprotected and protected ova, respectively, where the mean nucleation temperature for protected ova was strongly cooling rate dependent.

Research paper thumbnail of Cryomicroscope investigation and thermodynamic modelling of the freezing of unfertilized hamster ova

Thermodynamic computer modeling was used to predict the freezing response of single-celled unfert... more Thermodynamic computer modeling was used to predict the freezing response of single-celled unfertilized hamster ova. The cell membrane transport characteristics were investigated, using a microscope diffusion chamber system. The mean osmotically inactive cell volume was determined to be 21.6% of the initial cell volume. An overall mean value of 0.8 ? 0.1 pm3/pm2 . min . atm (= 18 * 2.5 &sec) was determined for the membrane hydraulic coefftcient, L,. The effect of the extracellular solute concentration on L, was determined at room temperature (-23°C). A thermodynamic computer model was used to predict the cell response to freezing. The predicted response was compared to the actual volumetric response observed during freezing on a temperature-controlled cryomicroscope conduction stage. The effect of the cooling rate on the nucleation temperature of unprotected ova and protected ova suspended in a 1.5 M DMSO solution was investigated. Overall mean nucleation temperatures of -13 and -57.l"C were observed for unprotected and protected ova, respectively, where the mean nucleation temperature for protected ova was strongly cooling rate dependent.

Research paper thumbnail of Studies on the blood characteristics of Tilapia zilli (Gervais) I. Blood cells

Journal of Fish Biology, 1974

This paper is the first of a series reporting the results of a study on haematology of Tilapia zi... more This paper is the first of a series reporting the results of a study on haematology of Tilapia zilli (Gervais) in Egyptian waters. Erythrocyte count, total and differential leucocyte counts and their seasonal variations were studied. A complete description of the different types of leucocytes in the blood of T. zilli is given in detail. T. zilli is found to have medium sized red blood cells compared to other fishes. The analyses showed that it is one of the species having the highest leucocyte count. Polymorpho-nuclear leucocytes are not recorded in the blood smears of this fish.

Research paper thumbnail of Effect of pollution on the blood characteristics of Tilapia zillii G

Water Air and Soil Pollution, 1973

Lake Mariut, a shallow brackish water basin near Alexandria, was a highly productive lake; howeve... more Lake Mariut, a shallow brackish water basin near Alexandria, was a highly productive lake; however, it now receives large quantities of pollutants. The amount of DO has been greatly reduced.Tilapia zillii G. have been studied to determine the modification of blood characteristics. In O2 deficient areas of Lake Mariut the fish undergo asphyxiation.

Research paper thumbnail of Effect of temperature and salinity changes on the blood characteristics of Tilapia zilli G. In egyptian littoral lakes

Comparative Biochemistry and Physiology Part A: Physiology, 1973

... Stress caused by low temperatures may account for winter mortalities in various fish species ... more ... Stress caused by low temperatures may account for winter mortalities in various fish species in temperate countries ... were maintained in suitable continually aerated aquaria, The average temperature of water in the aquaria was about 16-5 C. 183 184 AM FARGHALY, AA EZZAT ...

Research paper thumbnail of Effects of cadmium toxicity upon the in vivo and in vitro activity of proteins and five enzymes in blood serum and tissue homogenates of Mugil cephalus

Comparative Biochemistry and Physiology Part C: Comparative Pharmacology, 1985

l. This study reports changes in total protein and certain liver, heart, gill and serum enzymes a... more l. This study reports changes in total protein and certain liver, heart, gill and serum enzymes after exposing fish or tissue homogenates and serum to Cd, i.e. in rivo and in vitro effects.

Research paper thumbnail of Organochlorine pesticide residues in 12 freshwater Egyptian fish species with special emphasis on Aguilla vulgaris and Mugil cephalus

Comparative Biochemistry and Physiology Part C: Comparative Pharmacology, 1983

Determination of DDT and endrin concentrations was carried out in fishes of Nozha hydrodrome to e... more Determination of DDT and endrin concentrations was carried out in fishes of Nozha hydrodrome to elucidate reasons for variations in the values, since little seems to be known about pesticide residues in Egyptian freshwater fishes. This study documents and examines the accumulation and biotransformation of water-borne pesticides by the gills, liver, gonads, muscle and heart of fishes tested. The response of eel and mullet to concentrations of 0.05, 0.1, 0.5 and 1.0 ppb DDT and endrin varied among organs, the residues were highest in the liver, intermediate in the gonads and low to non-detectable in muscles and heart for both species.

Research paper thumbnail of Bioaccumulation of cadmium: Toxicity in Mugil cephalus

Comparative Biochemistry and Physiology Part C: Comparative Pharmacology, 1985

A series of 12 lethal and sublethal concentrations of Cd were applied in seawater to determine LC... more A series of 12 lethal and sublethal concentrations of Cd were applied in seawater to determine LC,, for two sizes of fish.

Drafts by m shabana

Research paper thumbnail of A suggested unit for the pain administration in Organizational structure of the youth and sport ministry

Research paper thumbnail of Cryomicroscope investigation and thermodynamic modeling of the freezing of unfertilized hamster ova

Cryobiology, 1988

Thermodynamic computer modeling was used to predict the freezing response of single-celled unfert... more Thermodynamic computer modeling was used to predict the freezing response of single-celled unfertilized hamster ova. The cell membrane transport characteristics were investigated, using a microscope diffusion chamber system. The mean osmotically inactive cell volume was determined to be 21.6% of the initial cell volume. An overall mean value of 0.8 ? 0.1 pm3/pm2 . min . atm (= 18 * 2.5 &sec) was determined for the membrane hydraulic coefftcient, L,. The effect of the extracellular solute concentration on L, was determined at room temperature (-23°C). A thermodynamic computer model was used to predict the cell response to freezing. The predicted response was compared to the actual volumetric response observed during freezing on a temperature-controlled cryomicroscope conduction stage. The effect of the cooling rate on the nucleation temperature of unprotected ova and protected ova suspended in a 1.5 M DMSO solution was investigated. Overall mean nucleation temperatures of -13 and -57.l"C were observed for unprotected and protected ova, respectively, where the mean nucleation temperature for protected ova was strongly cooling rate dependent.

Research paper thumbnail of Cryomicroscope investigation and thermodynamic modelling of the freezing of unfertilized hamster ova

Thermodynamic computer modeling was used to predict the freezing response of single-celled unfert... more Thermodynamic computer modeling was used to predict the freezing response of single-celled unfertilized hamster ova. The cell membrane transport characteristics were investigated, using a microscope diffusion chamber system. The mean osmotically inactive cell volume was determined to be 21.6% of the initial cell volume. An overall mean value of 0.8 ? 0.1 pm3/pm2 . min . atm (= 18 * 2.5 &sec) was determined for the membrane hydraulic coefftcient, L,. The effect of the extracellular solute concentration on L, was determined at room temperature (-23°C). A thermodynamic computer model was used to predict the cell response to freezing. The predicted response was compared to the actual volumetric response observed during freezing on a temperature-controlled cryomicroscope conduction stage. The effect of the cooling rate on the nucleation temperature of unprotected ova and protected ova suspended in a 1.5 M DMSO solution was investigated. Overall mean nucleation temperatures of -13 and -57.l"C were observed for unprotected and protected ova, respectively, where the mean nucleation temperature for protected ova was strongly cooling rate dependent.

Research paper thumbnail of Studies on the blood characteristics of Tilapia zilli (Gervais) I. Blood cells

Journal of Fish Biology, 1974

This paper is the first of a series reporting the results of a study on haematology of Tilapia zi... more This paper is the first of a series reporting the results of a study on haematology of Tilapia zilli (Gervais) in Egyptian waters. Erythrocyte count, total and differential leucocyte counts and their seasonal variations were studied. A complete description of the different types of leucocytes in the blood of T. zilli is given in detail. T. zilli is found to have medium sized red blood cells compared to other fishes. The analyses showed that it is one of the species having the highest leucocyte count. Polymorpho-nuclear leucocytes are not recorded in the blood smears of this fish.

Research paper thumbnail of Effect of pollution on the blood characteristics of Tilapia zillii G

Water Air and Soil Pollution, 1973

Lake Mariut, a shallow brackish water basin near Alexandria, was a highly productive lake; howeve... more Lake Mariut, a shallow brackish water basin near Alexandria, was a highly productive lake; however, it now receives large quantities of pollutants. The amount of DO has been greatly reduced.Tilapia zillii G. have been studied to determine the modification of blood characteristics. In O2 deficient areas of Lake Mariut the fish undergo asphyxiation.

Research paper thumbnail of Effect of temperature and salinity changes on the blood characteristics of Tilapia zilli G. In egyptian littoral lakes

Comparative Biochemistry and Physiology Part A: Physiology, 1973

... Stress caused by low temperatures may account for winter mortalities in various fish species ... more ... Stress caused by low temperatures may account for winter mortalities in various fish species in temperate countries ... were maintained in suitable continually aerated aquaria, The average temperature of water in the aquaria was about 16-5 C. 183 184 AM FARGHALY, AA EZZAT ...

Research paper thumbnail of Effects of cadmium toxicity upon the in vivo and in vitro activity of proteins and five enzymes in blood serum and tissue homogenates of Mugil cephalus

Comparative Biochemistry and Physiology Part C: Comparative Pharmacology, 1985

l. This study reports changes in total protein and certain liver, heart, gill and serum enzymes a... more l. This study reports changes in total protein and certain liver, heart, gill and serum enzymes after exposing fish or tissue homogenates and serum to Cd, i.e. in rivo and in vitro effects.

Research paper thumbnail of Organochlorine pesticide residues in 12 freshwater Egyptian fish species with special emphasis on Aguilla vulgaris and Mugil cephalus

Comparative Biochemistry and Physiology Part C: Comparative Pharmacology, 1983

Determination of DDT and endrin concentrations was carried out in fishes of Nozha hydrodrome to e... more Determination of DDT and endrin concentrations was carried out in fishes of Nozha hydrodrome to elucidate reasons for variations in the values, since little seems to be known about pesticide residues in Egyptian freshwater fishes. This study documents and examines the accumulation and biotransformation of water-borne pesticides by the gills, liver, gonads, muscle and heart of fishes tested. The response of eel and mullet to concentrations of 0.05, 0.1, 0.5 and 1.0 ppb DDT and endrin varied among organs, the residues were highest in the liver, intermediate in the gonads and low to non-detectable in muscles and heart for both species.

Research paper thumbnail of Bioaccumulation of cadmium: Toxicity in Mugil cephalus

Comparative Biochemistry and Physiology Part C: Comparative Pharmacology, 1985

A series of 12 lethal and sublethal concentrations of Cd were applied in seawater to determine LC... more A series of 12 lethal and sublethal concentrations of Cd were applied in seawater to determine LC,, for two sizes of fish.