Our present study provides an expedient general approach for the synthesis of some novel bridged dibenzo-azocinone,
-azoninone, -azecinone, -azocine, -azonine, and -azecine derivatives via Friedel–Crafts intramolecular ring-closure
reactions. The methodology is realized by a four-step protocol involving first preparation of 7-methyl-3,3-diphenylindoline
through the reduction of 7-methyl-3,3-diphenylindolin-2-one followed by N-alkylations with different haloesters (a-, b- or
g-). The resulting indoline ester derivatives were allowed to react both by addition of Grignard reagents to afford alcohols
and by hydrolysis to afford acids. Particular attention has been given to the novel structures especially in regard to the
promising pharmaceutical and therapeutic values associated with their skeletons.

Abstract: The present study, conducted in 2011 and 2012, deals with the response of Calligonum polygonoides and Artemisia judaica
to the drought conditions in Wadi El-Assiuty and its tributary Wadi Habib in the middle part of the Eastern Desert of Egypt. Soil and
plant samples were collected from 50 stands in the wet (winter) and dry (summer) seasons. In the selected plants chlorophyll (Chl a and
b) contents as well as the Chl stability index tended to increase significantly during the summer season. Calcium and magnesium were
accumulated in considerable amounts in the studied plants. Amounts of calcium accumulated were higher than those of magnesium.
Phosphates appeared in the plants in low amounts and correlated positively with those found in the soil. The studied plants showed an
increase in soluble sugars accumulation. Soluble protein content increased significantly during the winter season with a corresponding
decrease in free amino acids. It is quite clear that Calligonum polygonoides plants were better adapted to drought conditions prevailing in
the area under study than Artemisia judaica. This was judged by the average metabolic potentiality as soluble metabolites (soluble sugars
and soluble proteins) are much higher in Calligonum than in Artemisia.

Abstract: The present study, conducted in 2011 and 2012, deals with the response of Calligonum polygonoides and Artemisia judaica
to the drought conditions in Wadi El-Assiuty and its tributary Wadi Habib in the middle part of the Eastern Desert of Egypt. Soil and
plant samples were collected from 50 stands in the wet (winter) and dry (summer) seasons. In the selected plants chlorophyll (Chl a and
b) contents as well as the Chl stability index tended to increase significantly during the summer season. Calcium and magnesium were
accumulated in considerable amounts in the studied plants. Amounts of calcium accumulated were higher than those of magnesium.
Phosphates appeared in the plants in low amounts and correlated positively with those found in the soil. The studied plants showed an
increase in soluble sugars accumulation. Soluble protein content increased significantly during the winter season with a corresponding
decrease in free amino acids. It is quite clear that Calligonum polygonoides plants were better adapted to drought conditions prevailing in
the area under study than Artemisia judaica. This was judged by the average metabolic potentiality as soluble metabolites (soluble sugars
and soluble proteins) are much higher in Calligonum than in Artemisia.

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Extended one-step schemes of exponential type are introduced for the numerical solution of
stiff initial-value problems. These schemes are uniformly convergent of third and fourth
orders of accuracy. In addition, we show that these schemes are optimal when ϵ→ 0.
Numerical results and comparisons with other schemes are presented.

Extended one-step schemes of exponential type are introduced for the numerical solution of
stiff initial-value problems. These schemes are uniformly convergent of third and fourth
orders of accuracy. In addition, we show that these schemes are optimal when ϵ→ 0.
Numerical results and comparisons with other schemes are presented.

Extended one-step schemes of exponential type are introduced for solving singularly
perturbed Volterra integro-differential problems. These schemes are of order (m+ 1), m= 0, 1,
2,…, when the perturbation parameter, ε, is fixed. These schemes have the property that if ε
is of order h they reduced to first order of accuracy and optimal when ε→ 0. Stability analysis
of these schemes are presented. Numerical results and comparisons with other schemes
are presented.

Extended one-step schemes of exponential type are introduced for solving singularly
perturbed Volterra integro-differential problems. These schemes are of order (m+ 1), m= 0, 1,
2,…, when the perturbation parameter, ε, is fixed. These schemes have the property that if ε
is of order h they reduced to first order of accuracy and optimal when ε→ 0. Stability analysis
of these schemes are presented. Numerical results and comparisons with other schemes
are presented.

We have assessed the accuracy of a simplified integral equation (SIE) modeling approach
for marine controlled-source electromagnetics (CSEM) with low applied frequencies and a
resistive target. The most computationally intensive part of rigorous integral equation (IE)
modeling is the computation of the anomalous electric field within the target itself. This leads
to a matrix problem with a dense coefficient matrix. It is well known that, in general, the
presence of many grid cells creates a computational disadvantage for dense-matrix