Vol. 11 Issue 2
Abdulla Alkubaisi and Ezzeldine H.M. Ibrahime
The reaction between 3.7-disubstituted-2.5-diamino-pyrazolo [1,5-a] pyrimidine-6-carbonitriles (OPC) with iodine is studied photometrically in various chlorinated solvents. The results obtained from spectroscopic measurements revealed that in each solvent the (OPC): I, ratio is 1:2 and the charge transfer (CT) iodine complex is assigned the formula (OPC) 1+1,_. Values of the formation constant (k), molar absorptivity (E) and oscillator strength (f) for the I2 (CT) complex were obtained. It was shown that the values of these constants depend entirely on the polarity of the solvent. Where it was indicated that there is a linear correlation between either the oscillator strength or the molar absorptivity and the dielectric constant of the solvent. suggesting a type of interaction between the ionic (CT) complex with the solvent.
Basyoni, M.H. and Al-Mansi, A.M.A
Eqah Island is a reef composed of aragonite and calcite aged 1740 ± 60 years. The Island is covered by medium 10 fine: skeletal and non-skeletal carbonate sand of marine origin The analysis of the surficial sediments shows a significant change in mean grain size along the beach (seaward side) which represents fining in the direction of the wave-driven movement and as a result, the increases in supply rate of fine sand particles from the north to the south direction. The beach against the land has larger grain sizes. This is due to the steep foreshore slope of the beach. The grain size distribution of the sediments are polymodal and well to moderately sorted.
Ibrahim, H.A., Bakheit, A.A. and Faheem, S.M.
Nineteen vertical electrical soundings (VES) were measured on the surface in the area east of Sohag to provide hydrogeologic information useful in groundwater exploration. These soundings are interpreted using automatic processing and interpretation programs of Schlumberger sounding curves prepared by Zohdy (1989 b). The results of the interpretation indicate the presence of a shallow water-bearing layer especially in the southern part of the area. This layer is diminished toward the east. In certain parts, the low-resistivity material could not be considered as water-bearing bed but it is possibly related to a shale bed dominating the area. The SP and horizontal resistivity measurements taken in certain directions (AA' and CC') show lateral variation of sedimentary facies in these locations.
Mohammad T. Aboul-Ela, Adel R. Awad and Hassan Y. Akour
The relationship between the speed or vehicles and their emitted noise levels were investigated in this paper. Vehicles were classified into three distinct classes: Automobiles (A), Medium Trucks (MT) and Heavy Trucks (HT).
Measurement sites were in rural or quiet suburban locations in lrbid District so that passing vehicles would be measured independently as signle events. The measurements were sorted by speed classes as well as by vehicle type. Each vehicle class was statistically analyzed. Linear regression analysis led to the development or a set or noise prediction models. These models may be used to establish noise level standards and will assist in land use planning.
A comparison or the developed noise models or Irbid District with those suggested by FHWA and Ontario Ministry of Transportation was made.
M. A. Zidan and A.A. Malibari
The effect of NaCl-salinization (150 mM) and KCl addition (5, 10 and 15 mM) on growth and some organic and mineral components of wheat plants (Trilicum aeslivum L. c. Samma) were studied. Salinization with only NaCl induced a considerable reduction in growth, carbohydrates, proteins and the contents of K, Ca and Mg, whereas, the contents of free amino acids including proline were increased. The addition of KCl to the salinized media ameliorated the adverse effects of NaCl. This reduction counteraction was associated with high contents of proteins and K/Na ratios
Salah S. Tag El Din
Five foliage shrubs were defoliated in different seasons in order to estimate the foliage productivity and current year growth. Shrubs under study were Atriplex halimus, A. nummularia, A. canscens, A. polycarba, and Salsola vermiculata. Investigated parameters were green foliage weight (GFW), dry foliage weight (DFWl. green current year growth (GCYG), and dry current year growth (DCYG).
Productivity estimates observed in spring (702 kg/ha dry matter) and summer (725 kg/ha) were significantly higher than those in autumn (518 kg/hal) and winter (527 kg/hal). There were significant differences between productivity of different shrub species for all investigated parameters through all seasons except for GFW and DCYG in summer and winter, and for DCYG in summer, in the first year. Productivity trends showed that A. nummularia (770 kg/ha dry matter) had nearly the highest yield followed by A. halims (716 kg/hal), A. canscens (671 kg/ha), S. vermiculata (500 kg/ha), and A. polycarba (437 kg/ha), respectively, in a decreasing order.
Browsing of these forage shrubs almost depends upon the range condition in which these shrubs were planted. Livestock could start browsing foliage shrubs in spring when the range condition is poor, in summer when range condition is fair and in autumn and winter when range condition is good .
Abdullah Yahia Basahy
Protein and amino acids were measured in seeds of 5 soybean cultivars (Cabrillo, Rillito, Duocrp, CM-3 and RK-315). Cabrillo was found to contain the highest protein content (41. 46%) and RK-315 the lowest (38 . 96%). Sixteen amino acids were detected and determined in the protein hydrolyzates; their concentration varied. Essential amino acids like leucine, Isoleucine, lysine, methionine, threonine, valine, phenylalanine were found in different quantities according to cultivars. Glutamic acid and arginine ranged between 900-1200 and 364-454 mg/g total nitrogen in the varieties.
Naim S. Ismail
There are three abandoned sewer outlets around Abu-Dhabi Island which were formerly used for sewage disposal and are now used for water disposal. During November 1990 a total of 140 core samples (0.01 m2 to a depth of 10-15 cm) were collected from the low tide line at the three sewer outlets and two control stations away from the outlets. Results show that there is a slight accumulation of organic carbon in sediments at two of the sewer outlets. However, the faunal analysis revealed that this accumulation has no measurable effects on the community structure of macrobenthic invertebrates at these outlets. The faunal composition at one of these stations is similar to that at one of the control stations. The other station has a faunal composition similar to that reported from non-polluted sandy beaches with similar sedimentary composition along the Arabian Gulf.
A.M. Al-Johany and M. Yousuf
Temperature selection of two fresh water fishes Aphanius dispar (Ruppel 1828) and Gambusia affinis Holbrooki (Girard 1859) was investigated in a thermal gradient. One animal at a time was studied in three temperature gradients extending from 6 to 40°C (Low range 6-21°C; Medium range 13-31°C; High Range 21- 40°C). Most of A. dispar selected temperatures between 14-15°C in the low range, 19-22°C in the medium range and 26-32°C in the high range, while G. affinis selected temperatures between 13-20°C in the low range; 22-30°C in the medium range and 22-32°C in the high range. The mean critical thermal maximum (C.T. Max.) for A. dispar and G. affinis was 38.1°C and 38°C respectively. The mean critical thermal minimum (C.T. Min.) was 4.2°C and 4.4°C for A. dispar and G. affinis. Both species showed a tolerance to high temperature, but the introduced species, G. affinis had a wider range and is better suited to adopt to the desert habitat, and hence could constitute a thread to the endemic species A. dispar.
Ahmed R. Al-Himaidi
Two commercially available gonadotrophic hormones: human post menopausal gonadotrophins (Pergonal, Serona, Italy) and human chorionic gonadotrophins (Profasi, Serona, Italy) have been used to test their superovulation capacity in females of three inbred mouse strains (Balb/c, CBA and C57BL/6). Females of the three strains have responded differently to the hormones and the dosage regime used. The best superovulation response was by Balb/c females to 10 IU of the hormones. Superovulation was also stimulated in CBA females by 10 IU of the hormones. The response has declined in females of both strains when the doses of the hormones were increased to 15 IU. However, superovulation in C57BL/6 females was only stimulated by the highest doses (15 IU) of the hormones used.