The combined effect of intraperitoneal insulin injection and electrical stimulation on hind limb regeneration in a metamorphic stage (number 58) of the Egyptian toad, Bufo regularis Reuss was studied after amputation at the mid shank. Insulin injection associated with electrical stimulation was an enhancing factor that promotes limb regeneration. Application of insulin with 10 mA current was more effective than that with 5 mA and 3 mA currents. Insulin and 10 mA current decreased the negative cases which failed to regenerate to 2.96%, while insulin and 5 mA current decreased them to 22.73%. Insulin with 3 mA current resulted in the production of 50% negative cases compared with 34% in control. It was suggested that insulin may enhance limb regeneration either by its direct effect on nerve endings, through its action on insulin and/or insulin like growth factors receptors or by increasing protein kinase activity resulting in increasing blastemal cell proliferation rate.
Electrical current was suggested to enhance limb regeneration either directly or indirectly through increasing the efficiency of insulin in promoting cell proliferation and limb regeneration. It was concluded that application of combined effect of insulin injection and electrical stimulation in highly affecting limb regeneration in Bufo regularis Reuss rather that application of either stimuli alone.

The propagation of electrostatic ion acoustic waves (IAWs) in a homogeneous, unmagnetized, and collisionless plasma system composed of two positive ions and superthermally distributed electrons is investigated. The three dimensional Kadomtsev-Petviashvili (KP) equation has been derived using the reductive perturbation analysis to describe the dynamics of the weakly nonlinear behavior of electrostatic IAWs in the Venusian ionosphere near the terminator region. A symbolic computational Painlevé analysis is employed to get various solutions of the KP equation. The stability of the localized structures solution against the variation in the transverse direction has been discussed. The condition for the localized pulses existence in the presence of transverse perturbations is examined via the pseudo-potential approach. Numerical studies to elaborate on the physical plasma parameters’ effects on the structural characteristics of nonlinear cnoidal, periodic, and soliton waves are graphically displayed. The model predicts a compressive supersonic IAWs can propagate in the Venusian ionosphere in agreement with the observations

The propagation of electrostatic ion acoustic waves (IAWs) in a homogeneous, unmagnetized, and collisionless plasma system composed of two positive ions and superthermally distributed electrons is investigated. The three dimensional Kadomtsev-Petviashvili (KP) equation has been derived using the reductive perturbation analysis to describe the dynamics of the weakly nonlinear behavior of electrostatic IAWs in the Venusian ionosphere near the terminator region. A symbolic computational Painlevé analysis is employed to get various solutions of the KP equation. The stability of the localized structures solution against the variation in the transverse direction has been discussed. The condition for the localized pulses existence in the presence of transverse perturbations is examined via the pseudo-potential approach. Numerical studies to elaborate on the physical plasma parameters’ effects on the structural characteristics of nonlinear cnoidal, periodic, and soliton waves are graphically displayed. The model predicts a compressive supersonic IAWs can propagate in the Venusian ionosphere in agreement with the observations

The propagation of electrostatic ion acoustic waves (IAWs) in a homogeneous, unmagnetized, and collisionless plasma system composed of two positive ions and superthermally distributed electrons is investigated. The three dimensional Kadomtsev-Petviashvili (KP) equation has been derived using the reductive perturbation analysis to describe the dynamics of the weakly nonlinear behavior of electrostatic IAWs in the Venusian ionosphere near the terminator region. A symbolic computational Painlevé analysis is employed to get various solutions of the KP equation. The stability of the localized structures solution against the variation in the transverse direction has been discussed. The condition for the localized pulses existence in the presence of transverse perturbations is examined via the pseudo-potential approach. Numerical studies to elaborate on the physical plasma parameters’ effects on the structural characteristics of nonlinear cnoidal, periodic, and soliton waves are graphically displayed. The model predicts a compressive supersonic IAWs can propagate in the Venusian ionosphere in agreement with the observations

Oral infections are still one of the major problems facing dental implants and cause delay in the healing process which leads eventually to the failure of the implant surgery and bone loss. In this study, Salvadora persica L. root (miswak), SPE, extract acts as a bio-reductant solution to produce a tiny size (< 20 nm) AgNPs with spherical shape spread easily on nanoporous anodized titanium implant (NPAT) surface to increase its corrosion resistance and antibacterial properties for good bone integration after dental surgeries. AgNPs were stabilized as nano-granules like pearls on NPAT surface formed our novel modified titanium surface named AgNPs(SPE)/NPAT where its morphology and structure were confirmed by transmission electron microscope (TEM), scanning electron microscope (SEM), and energy-dispersive X-ray analysis (EDX). Electrochemical impedance spectroscopy (EIS) with its fitting data based on Rs[RpQp][RbQb] was used to predict the duplex structure of titania film and to confirm its stability in a simulated physiological solution where the corrosion resistance increase from 10 to 72.9 k ohm/cm2 and from 4 to 5.53 k ohm/cm2 for the outer and the inner layer respectively, after 1 month of immersion in Hank’s solution at 37 °C. The pour plate method was used to achieve the antibacterial efficiency of the AgNPs(SPE)/NPAT against Staphylococcus aureus (ATCC6538) and established its significant inhibition better than NPAT surface that explains the vital role of SPE to keep the oral cavity with implant surfaces wellness.

Centaurea glomerata Vahl is an annual, monoecious and herbaceous member of Asteraceae, found in some localities of different topographic features/habitat conditions along the Mediterranean coastal region of Egypt. This study aimed to investigate some environmental gradients including edaphic and climate criteria on morphological, reproductive traits as well as phenolic and flavonoid metabolites in this species. Three distinct populations were selected. Two of them were located in coastal sand dunes (found in Rosetta region in Egypt); one was located on flat sand dunes, whereas the other grown on sloping ones. Meanwhile, the third population was represented in the rocky hillside of Burg El Arab region. The population detected in the sloping sand dunes showed best morphological and reproductive features, whilst the opposite was true for that represented on the rocky hillside. Moreover, the free phenolic and flavonoid compounds prevailed in the later. The meteorological data revealed that the rocky hillside received relatively lower minimum temperature and higher solar irradiance, while the sand dunes of Rosetta showed more warmer conditions. Light intensity and wind speed were reduced on the sloping sand dunes. The Canonical Correspondence Analysis (CCA) exhibited a clear correlation between most of metabolites detected and the population found on the rocky hillside along with higher solar irradiance prevails. The morpho-reproductive traits were related to climatic gradients and some soil criteria. These results revealed that the changes in micro-topography, that may lead to change in soil and climate variables, is the most important environmental gradient that controls the morphological and biochemical features of C. glomerata. Solar irradiance and/or light intensity are key factors playing a role influencing the measured traits of this species. These findings suggest that accumulation of secondary metabolites could be a biochemical strategy and an adaptational criterion for such species under stress conditions.

Centaurea glomerata Vahl is an annual, monoecious and herbaceous member of Asteraceae, found in some localities of different topographic features/habitat conditions along the Mediterranean coastal region of Egypt. This study aimed to investigate some environmental gradients including edaphic and climate criteria on morphological, reproductive traits as well as phenolic and flavonoid metabolites in this species. Three distinct populations were selected. Two of them were located in coastal sand dunes (found in Rosetta region in Egypt); one was located on flat sand dunes, whereas the other grown on sloping ones. Meanwhile, the third population was represented in the rocky hillside of Burg El Arab region. The population detected in the sloping sand dunes showed best morphological and reproductive features, whilst the opposite was true for that represented on the rocky hillside. Moreover, the free phenolic and flavonoid compounds prevailed in the later. The meteorological data revealed that the rocky hillside received relatively lower minimum temperature and higher solar irradiance, while the sand dunes of Rosetta showed more warmer conditions. Light intensity and wind speed were reduced on the sloping sand dunes. The Canonical Correspondence Analysis (CCA) exhibited a clear correlation between most of metabolites detected and the population found on the rocky hillside along with higher solar irradiance prevails. The morpho-reproductive traits were related to climatic gradients and some soil criteria. These results revealed that the changes in micro-topography, that may lead to change in soil and climate variables, is the most important environmental gradient that controls the morphological and biochemical features of C. glomerata. Solar irradiance and/or light intensity are key factors playing a role influencing the measured traits of this species. These findings suggest that accumulation of secondary metabolites could be a biochemical strategy and an adaptational criterion for such species under stress conditions.

Centaurea glomerata Vahl is an annual, monoecious and herbaceous member of Asteraceae, found in some localities of different topographic features/habitat conditions along the Mediterranean coastal region of Egypt. This study aimed to investigate some environmental gradients including edaphic and climate criteria on morphological, reproductive traits as well as phenolic and flavonoid metabolites in this species. Three distinct populations were selected. Two of them were located in coastal sand dunes (found in Rosetta region in Egypt); one was located on flat sand dunes, whereas the other grown on sloping ones. Meanwhile, the third population was represented in the rocky hillside of Burg El Arab region. The population detected in the sloping sand dunes showed best morphological and reproductive features, whilst the opposite was true for that represented on the rocky hillside. Moreover, the free phenolic and flavonoid compounds prevailed in the later. The meteorological data revealed that the rocky hillside received relatively lower minimum temperature and higher solar irradiance, while the sand dunes of Rosetta showed more warmer conditions. Light intensity and wind speed were reduced on the sloping sand dunes. The Canonical Correspondence Analysis (CCA) exhibited a clear correlation between most of metabolites detected and the population found on the rocky hillside along with higher solar irradiance prevails. The morpho-reproductive traits were related to climatic gradients and some soil criteria. These results revealed that the changes in micro-topography, that may lead to change in soil and climate variables, is the most important environmental gradient that controls the morphological and biochemical features of C. glomerata. Solar irradiance and/or light intensity are key factors playing a role influencing the measured traits of this species. These findings suggest that accumulation of secondary metabolites could be a biochemical strategy and an adaptational criterion for such species under stress conditions.

NULL

NULL