Vol. 23 Issue 1
Ali Adel Kanso
A keystream generator that is made up of a single linear feedback shift register and two sets of non-negative integers is presented for use in stream cipher applications. When the linear feedback shift register is primitive and the elements of the two sets are carefully chosen, the output sequence of the generator has a long period and high linear complexity. Lower bounds are provided for the appearance of all patte of reasonable length, and for some correlation attacks. The output sequences of this generator may have some applications in cryptography and spread spectrum communications.
Ansary E. Al Mofiah and Abdel Rahman Ibrahim Al-Humaid
Effects of different types of antitranspirants (ATS) on vegetative growth, flowering, marketable inflorescences, bulb production, mineral concentration, soluble sugars, and total carbohydrate concentration of tuberose (Polianthes tuberosa L.) cv. Double plants, grown under the irrigation regimes of 100%, 80% and 60% of total evapotranspiration (ET) values, were investigated to select the suitable (AT) for conserving irrigation water, and with no detrimental effects on growth and production of tuberose plants grown in Al-Qassim region. Plant biomass, number of leaves, length and weight of marketable inflorescences and bulb yield, were significantly reduced by water deficit, particularly at 60% (ET). But the flowering period was markedly shortened under stress conditions. Under water deficit (N, P, K, Ca,) total carbohydrates and soluble sugars decreased in treated leaves as compared to the control plants. Both types of (ATs) effectively enhanced plant performance, flower formation, bulb production, nutrient uptake and carbohydrate synthesis at the 80% (ET) treatment, relative to the irrigation regime of 80%(ET). The particle type (AT). Kaolin, was more effective than the emulsion type (AT), Vapor Gard (VG), which might be attributed to its mechanism for reducing leaf temperature, transpiration rate, improvement of plant water status and maintaining biomass production of tuberose plants. Due to the superiority of Kaolin particle film in regulating plant performance and chemistry it is recommended for reducing water loss by plants in Al-Qassim region, Saudi Arabia.
Muhammed Khamid Sanwar Wattoo, F. H. Wattoo, T. G. Kazi, S. A. Tirmizi and Javed Iqbal
Diet, club, and ice-cream sodas are flavoured soft drinks consumed throughout the world, especially in summer seasons. This study has been undertaken to monitor the bacterial and chemical contamination of these national and international branded drinks procured from local markets. The isolated coliforms and microbes were E. coli, Salmonella spp, Klebsiella spp. Enterobacter spp, Shigella spp and Bacillus cereus. Diet and club sodas were less contaminated with microorganisms than were ice-cream sodas Fifteen trace and toxic elements were identified with an atomic absorption spectrophotometer following the improved ash digestion method. The values of Nickel (Ni), (0.15 mg/L), (Pb (0.28 mg/L), Cadmium (Cd) (0.13 mg/L) and (AI (0.76 mg/L), were higher than the (WHO) recommended limits. The concentrations of (Na, Fe, Pb) and Chromium (Cr) were higher in club sodas than diet and ice-cream sodas and the concentrations of Calcium (Ca). Magnesium (Mg), Potassium (K), Iron (Fe), Zinc (Zn), Aluminum (Al), Barium (Ba). (Co), Cobalt, and Manganese (Mn) in ice-cream sodas were also higher than diet and club sodas. Overall, the ice-cream sodas did not conform to the (WHO) standards allowed for safe ingestion of micro and macro-metals in various drinks.
Mahmoud Mahmoud Kardousha
Four helminth larvae from different fish hosts caught from Emirati coasts are described. Two are metacercariae related to genus Stephanostomum, type (I) and (IT). Type (1) was found encysted in body cavities of the Indian halibut Psettodes erumei and the areolate grouper Epinephelus areolatus, and type (II) in the golden stripped goatfish Mulloides flavolineatus. The third larva is related to Acanthocephala and identified as Serrasentis sagittifer. It was collected from the body cavity of the spotted lizard fish Saurida undosquamis. The fourth larva belongs to the didymozoid trematodes, and was found infecting the kidneys of different hosts, suchy as Saurida undosquamis, the Jack pomfret Parastromateus niger and the mackerel tuna Euthynnus affinis. The larvae related to Stephanostomum type (D) and (IT) and the dydimozoid type are described for the first time in the Arabian Gulf.
Marzoug Al-Gounaim, Ali Diab, Ahmed Al-Hilali and Abdul Saftar Abu-Shady
Soil samples of different levels of oil pollutants were collected from Kuwait's Burgan Oil Field, near an oil lake. The samples represented, highly polluted (8.0% w/w), moderately polluted (2.1%-3.4%) and slightly polluted (0.5- 0.8%). The aromatic fractions of the collected samples were in the range of (0.21 2.578/100g) soil (GC) analysis of the aromatic fractions for the resolution of the different individual (PAH) revealed the presence of (16) different (PAH) resolved from the aromatic fraction of the highly polluted sample (53). (15). (14) and (13) individual (PAH) were identified from soil samples (55), (52) and (S1, S4, S6) respectively The most frequent (PAH) was indeno (1.2.3-c.d) pyrene (22.5%-45.11%) followed chrysene (13.6%-19.48%). Eight carcinogenic (PAH) were resolved from the aromatic fractions of the polluted samples. Total carcinogenic (PAHs) recorded in this study were the range of (11.53) (for S4) - (510.98) (for $3) ppm. The counts of (CFU) of aromatic degraders (AD) were in the range of (3 x 10)-(110 x10") (CFU/g) soil (with a percent of (2.2%-69.6%)). The results show that, higher counts of (AD) were recorded from the highly polluted sample (3), followed by the moderately polluted samples, total of (51) bacteria, that gave presumptive positive biodegradation activities, were isolated and identified. (45.1%) of them were isolated from the highly polluted sample (53) . Total of (13) different species were identified of which Micrococcus luteus was more frequent (23.5) followed by Bacillus licheniformis (19.6%) and Bacillus subtilis (11.8%). The three Pseudomonas species collectively were represented by (11.8%). Five different species proved to be of good activities, they are Bacillus brevis, Bacillus licheniformis, Pseudomonas aeruginosa, Pseudomonas starteri and Pseudomonas fluorescents The ability of the five species and their mixture was investigated. The three Pseudomonas spp were able to degrade more (PAHs) than the Bacillus spp. On the other hand the mixed culture showed high biodegradation activities (88.6%) as compared to the pure individual cultures
Hazem Attia
The steady Couette flow with heat transfer of a conducting fluid is studied, taking into consideration the Hall effect. The viscosity of the fluid is assumed to vary with temperature. The fluid is subjected to a constant pressure gradient and an external uniform magnetic field perpendicular to the plates. which are kept at different but constant temperatures. The effect of Hall's current on the velocity components as well as on the temperature, is more pronounced for higher values of viscosity exponent. It was also found that the Hall term has a marked effect on the axial and transverse components of the skin friction and the Nusselt number at both walls of the channel.
Dr. Abdul-Haleem A. Al-Muhyi
: A numerical model is developed in order to simulate land and sea breeze phenomenon in the Gulf of Sirte, which is located on the Libyan coastline A Mixed-Layer Model is used to simulate land and sea breezes and their effect on the coastal strip The model consists of three layers, the surface layer, the mixed layer and the stable layer The primitive equations are averaged in the mixed layer to yield prediction equations for the horizontal components of the wind, two components of the horizontal pressure gradient, potential temperature of the mixed layer, the height of the base of the overlying stable layer and the surface temperature. The results show that the model is successful in simulating land and sea breezes and making clear the difference between the influence of onshore and offshore winds on the coastal strip.