Vol. 9 Issue 1
Ali H. Al-Mousawi, J.M.A. Al-Rawi and M.S Al-Ajiely
2-N-Alanylacciate (4a). 2-N-Tyrosyl ethyl acetate (4h). 2-N-Ethylcarba-zate (3), 2-N-Piprazino (4c) and 2-N-(2-aminothiazole) (44)-7-chloro-4.5-dioxopyrano 13.4-c||1-3-oxazinc-4, 5-dionc were synthesized and tested for their antimicrobial activity against three bacteria E. coli, P.acruginosa and S. aureus, and two types of fungi. C. albican. and A. spinosa. Compounds number 3, 4a, and 4h gave significant results toward tested microorganism.
Kamel, A.A.M., Sharara, A.M. and Amin, A.M
Six granitic localities from southern Sinai, Egypt were selected for the present study. Representative samples were collected from each area. These samples were examined microscopically and mineralogically analysed using X-ray diffraction technique. Porphyritic and granular textures occur. These samples are essentially composed of quartz, K-feldspars (microcline-orthoclase), plagioclase feldspars (oligoclase-albite) and biotite. They vary in the relative proportion of these minerals. alteration and degree of interlocking. The mechanical and physical properties of specimens prepared from cach granitic locality were determined. The results are promising since they are within the range of cifications required for construction and ornamental stones. In addition, the variation in the compressive strength values of these granites was correlated with the texture and composition.
Rahat Husain
The paper presents a technique of maintaining and calibrating similar and non-similar standard resistors based on double ratio set using one reference standard only. This technique is further applied in matrix method of calibrating a group of similar resistors 10 yield heter precision in values and maintain the unit of resistance at KFUPM Research Institute. A group of standard resistors of values 1 Ohm, 1k Ohms and 10k Ohms were calibrated and the results compared with the determinations made through direct substitution method using double ratio set which requires two resistance standards with one as the reference. Performance of calibration is also checked on the basis of closeness between calibrated values of a standard resistor, obtained through use of similar type of standards as reference. The stability requirement of less than 1 ppm/year is achieved.
Kamal N. Abdalla
In this study a simple quantitative correlation for predicting exhaust smoke level from a direct injection diesel engine has been developed. The effects or different engine operating parameters on exhaust smoke level have been investigated experimentally. The experimental results showed that exhaust smoke is significantly affected by changes in the diffusion burning fraction, engine speed and overall equivalent ratio. As a result a simple quantitative formula which relates exhaust smoke to these variables is presented.
O.H. Mobarek
The variational method is used to obtain an approximate solution to the Thomas-Fermi equation. Group of exponential functions are used in attempt to improve the desired results. This method eliminates the shortcomings of the exact solution, such as the behaviour of the electronic density far away and close 10 the nucleus. Also it enables us to use the Thomas-Fermi equation to treat the negative ions. The method has been tested by calculating the diamagnetic susceptibilities of the neutral atoms and the ions and comparing them with the experimental values and the Thomas-Fermi results.
T.R. Ahmad and M.A. Ali
Seasonal light activities of Ephestia cautella (Walker), Ephestia calidella (Geunec), Ephestia figulilella (Gregson), Ephestia clutclla (Hubner), Ephestia Kuchniclla (Zeller) and Plodia interpunctella (Hubner), were monitored with pheromone traps during 1985/1986, 1986/1987, 1987/1988 and 1988/1989. Results revealed that all Ephestia species occurred simultaneously in the dates warehouse and their adult populations fluctuated in the same manner. In all storage periods, the flight activity for all Ephestia species in addition to Plodia interpunctella was relatively high in October at the time where the dates were brought to the warehouses for storage. Thereafter, the flight gradually decreased in late November until it reached zero catches from December to March. It was then followed by an increase in activity again in carly April, peaked in mid-April 10 mid-May and ended in September during 1986 and in July during the other years, after the dates had been completely marketed. However, the zero catches during winter months may have resulted from the extreme cold temperature or due to the larvae of all species entering diapause. Data from pheromone traps may be useful in determining the proper time of application of insecticides in dates warehouses
Ibrahim A. Arif
Ten algal species are reported for the first time from Saudi Arabia (5 Cyanophyta, 5 Chlorophyta) growing episodically. The algae were discovered on the surfaces of 3 species of snail , 1 species o[ turtle and 1 species of frog. Snails were covered mostly by the green algae Cladophora glomerata and Enteromorpha intestinalis. The green alga Basic/adia chelonum (newly recorded [or Saudi Arabia) and the blue-green alga. Microcystis robust were the most common algae on turtles. Frogs were dominated by a species of the green alga Chlorella.
Faisal M. Abou-Tarboush
This study was conducted to induce cold-sensitive mutations in the Base stock of Drosophila melanogaster and to identify the effective lethal phase (LP) and the temperature-sensitive period (TSP) for the mutants. Ethyl methanesulfonate (EMS) was used as the mutagenic agent. Base EMS-treated males were mated to virgin Canton-S females. Progeny were mated individually and tested for lethality at 18°C and for viability at 25°C. The stable stocks obtained were retested for lethality at 18°C. Two different sex-linked recessive cold-sensitive lethal mutants were obtained out of 884 tested F1 males. The LP and TSP for both stocks were determined and described. Due to the variability and instability of cold-sensitive stocks, care should be taken in using such stocks.
Imad M. Al-Ani
The present study was carried out to elucidate the effects of furosemide on the degree of granularity of the JGCs.
Fifteen male young-adult albino mice were given 0.3 mg/ml furosemide in their drinking water. Each experimental mouse was found to have drunk 10-12 ml of water containing furosemide, while control animals drunk 2-3 ml of drinking water. After three weeks, all animals were sacrificed and kidneys were fixed in 10% buffered formalin and processed for light microscopy. Sections were stained for juxtaglomerular cells (JGCs) demonstration by alkaline crystal violet (Harada 1971) and by Bowie's method (Bowie 1936). The juxtaglomerular index (JGI) and the percentage of granulated nephron (%GN) were calculated according to the method of Hartroft and Hartroft (Hartroft & Hartroft 1953).
Kidneys from experimental animals showed an increase in both JGI and %GN following treatment with furosemide indicating hypertrophy, hyperactivity of the JGCs and increasing rate of renin release.
S.M. Al-Sewaigh, M.H. Al-Whalbi and M.O. Basalah
Osmoregulation in date palm seedlings (Phoenix dactylifera L. Cv Khedhri) was studied under salinity where NaCl was added to the nutrient solution. The concentrations of NaCl in the nutrient solution were 0.12 as control 6, 12, 20 and 30 g/L (as treatments). Seedlings (about 3 months old) were watered by these solutions for four weeks in the green house. When the osmotic potential of the external medium was decreased, the total potential of the tissue (Ψ1) decreased proportionally (about 5 bars). Relative water content (RWC) had the same trend as that of (Ψ1) where salinity treatment resulted in lower RCW (97% - 89%). Of the compounds that accumulated in the tissue were Na' and proline. Proline accumulation in plant was enhanced by the presence of NaCl in the medium. Other parameters, such as K, Mg, Ca, PO4, sugars and total amino acids did not show regular changes in their concentrations which indicate that they do not have a specific role in the osmoregulation of these seedlings.