Abstract

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Abstract

Cover Pages

Abstract

This study was investigated the quality of drinking water supplied in Some Commercial Water Purification Systems at Sabratha area. Water samples were collected from five stations at Sabratha region. The physicochemical parameters were mainly, pH, Alkalinity, Chloride, Nitrate, Sulfate, Magnesium, Calcium, Sodium, Potassium and TDS. The result shows that all these parameters were fall below WHO guidelines, except pH. The bacteriological result revealed that one of the studied stations was contaminated by E. coli bacteria

Abstract

Ru-polypyridyl complexes are widely selected as the photosensitiser, while Pt or Pd based moieties bound via a bridging ligand are attractive catalytic centers due to their low overpotential for proton reduction, which is very challenging due to their short lifetimes We have recently observed for a series of Ru/Pd and Ru/Pt photocatalysts that photoexcitation not only leads to population of Franck-Condon states localised on the bridging ligand, but also on states localised on the peripheral ligands. UV/Vis, resonance-Raman, and transient- absorption spectroscopy have been employed to characterize the catalytically competent intermediate. [(tbbipy)2 Ru(tpphz) PdCl2] (PF6)2, (Ru/ Pd) 1, where tbbpy=4,4`-di-tert-butyl-2,2`-bipyridine, tpphz= tetrapyrido [ 3,2-a: 2`,3`c: 3``,2``, -h:2```, 3```-j] phenazine). [(tbbipy) 2Ru (tpphz) PtCl2] (PF6)2 2, (Ru/Pt), and [(tbbipy) 2Ru (tpphz) RuC l2] (PF6)2 3, photocatalyst for the hydrogenation of nicotinamide reduce the catalytic activity upon visible-light irradiation fowling by both chromatography and resonance-Raman spectroscopy.

Abstract

The detection of new antibiotics and other bioactive microbial metabolites is a benefit step given the rate of the rising multi-drug resistant pathogenic microorganisms. This study aimed to isolate and screen the antimicrobial activity of gram positive bacteria named actinomycetes. The actinomycetes were isolated from near-shore marine sediment that were collected from three different depths at the Libyan Alkhoms coastline. A total of five out of twenty actinomycetes were isolated on different supported medium, whereas, Sabouraud Dextrose Agar was found to exhibit the antagonistic properties of the bioactive compounds produced by actinomycetes isolates. These isolates had shown a clear zone on Mueller-Hinton agar against target microorganisms were considered as actinomycetes labelled from HSEH1 to HSEH20. The antimicrobial properties of these isolates against (Klebcella pneumonia, Escherichia coli, Salmonella typhi, Staphylococcus aureus and Candida albicance were examined by primary screening using spot inoculating method. were examined by primary screening using spot inoculating method. The results that all the five selected isolates were according to biochemical testes found to show inhibitory activity against the target microbes. Generally HSEH16 isolate showed the highest inhibitory activity against all target pathogenic microbes compared with other selected isolates which have activity however, with different ranges of inhibition zone. Thus, the isolate HESH16 is the best among the other isolates considered to have a broad bacterial spectrum in this study. This isolate could be considered as potential antimicrobial properties of secondary metabolites against strains human pathogens and should be further studied for their human health.

Abstract

In this study we conducted a geochemistry assessment of surface costal water in Al Sabri area, Benghazi city. The chemical analysis data showed the plot of Mg/Ca vs. Na/Ca ratios is closed to carbonate rocks of the area. The water samples are found to be oversaturated with carbonate and evaporate minerals. The heavy metals values in the studied costal water are above than typical composition of seawater due to anthropogenic pollution, therefore the heavy metals are classified as seriously affected.

Abstract

The overall aim of this investigation is to determine the characteristics of raw municipal wastewater and assess the performance of UASB reactors to treat municipal wastewater of Baniwaleed city. The results showed that UASB reactors operated at ambient temperatures were highly effective in the treatment of wastewater at influent COD concentration 629 mg/l COD at HRT from 24 to 6 hours with the specific methane yield obtained was around 0.32 l CH4/g COD removed. The COD removal efficiencies were high at 95 % and total suspended solid removal was around 95%.The UASB technology provides a low-cost system for the direct treatment of municipal wastewater.

Abstract

This study was conducted in Al-Kufra oasis deep in the Libyan Desert (Sahara Desert). The aim was to evaluate the role of Vachellia nilotica trees in improving soil properties and creating islands of fertility even in a hyper-arid and degraded ecosystem. In three different plots, a systematic sampling procedure consisting of four soil samples collected from each tree from the uppermost layer of the soil (0-30 cm). The first was close to the tree trunk, the second was under the middle of the tree canopy, the third was under the canopy edge, and the fourth was collected from the inter-canopy zone away from the canopy edge. Tree characteristics and crown architecture were investigated for each tree. The study revealed that the mean levels of the examined nutrients in the under-canopy significantly differed from the adjacent inter-canopy zone. Total soil nitrogen, phosphorus, and organic matter contents were significantly higher, and the soil pH values were significantly lower (p < 0.05) under than inter-canopy zone. This study illustrated the vital role of indigenous Vachellia nilotica trees in creating islands of fertility and improving soil properties under their canopies over time without any active intervention, even in the hyper-arid and harsh environments as in the Sahara Desert.

Abstract

This study aimed to determine Status of Drinking Water in Kastamonu City using Water Quality Index, Ammonia, Iron, Phosphate and Manganese of drinking water quality in kastamonu City-Turkey. For this purpose, Data collection based on the average of 120 of water samples were taken either at station (before treatment), or from station (after treatment) in kastamonu city between (2011-2015). The average concentrations of the Physicochemical Parameters Water in the kastamonu city (before and after treatment) for (ammonia (NH4-N), phosphate (PO4-P), iron (Fe) and magnesium Mn) averaged between (0.0313-0.026. 0.0522-0.0331 ,0.0473-0.0233 ,0.0512-0.0262 mg/l) respectively. Findings display that the physical and chemical quality (NH4-N, PO4-P, Fe and Mn) were considerably below the Turkish Water Pollution Control Regulation (WPCSR) and USEPA standards for drinking water quality in both station. The Water quality index (WQI) is valuable and special ranking to depict the average water quality status. The Water quality index shows that the (before treatment) a higher (WQI) of 31.50 at Good water quality grades as against 17.18 at Excellent water quality grades recorded in (after treatment) in drinking water of kastamonu city the results indicated the Situation of drinking water in kastamonu city was high quality.

Abstract

The two naturally occurring polyamide heterocycles Distamycin and Netropsin belong to a group of heterocyclic compounds called Lexitropsins. These compounds exhibit their activity by binding to the minor groove of the DNA. These minor groove binders MGBs have several biological activities such as anticancer, antibiotics, and anti-parasitic qualities. Over the years several research groups have modified these compounds by replacing the pyrrole groups by other heterocyclic compounds and many other modifications have been employed to both the tail group and the head group. These gave rise to compounds with different biological activities.

Abstract

The study was conducted on a group of German cockroach adults and nymphs، and it was divided into groups، the first group included 40 male insects and females distributed into 4 groups equally، and the second group included the nymphs stage with the same number as the previous number and the same groups. The results showed as follows: at a concentration of 5000 ppm، the nymphs died after 4 days، at a rate of 20%، and when exposed to a dose of boric acid، all members of the sample died after 11 days، As for adult adullts، 40% of their members died within the first 3 days، and all adults died after a period of a days.In comparison between the two tests، it is noted through statistical analysis that there are no significant differences P=0.05.

Abstract

This study was conducted in order to evaluate the Allelopathic effects of the aqueous extract of Haloxylon articulatum on seed germination of Triticumae stivum, Hordeum vulgane, Zea mays, and Medicago sativa. The treatments included 100%, 50% and 25% aqueous extracts along with water as a control. One-way ANOVA test was adopted to examine the effect of these treatments on germination rate. The results showed that seed germination of all species decreased by increasing extract concentration. The highest and lowest seed germination was be longed to control and 100 % extract respectively. Generally, most significant effect appeared on Hordeum vulgane. and Medicago sativa. while the least affect appeared on Zea mays.

Abstract

Al-Hamada Al-Hamra region, which is a region with high environmental value, it is necessary to work to reduce the percentage of pollutants in it and preserve plants, especially perennials, which are a good source of livestock and camels, as the region has a fertile soft soil and a surprising climate, all The plants that have been studied have given high importance, whether medical, agricultural or economic, most of which are highly palatable to different livestock, and most importantly, two of them were identified as Endemic, which is endemic in Libya and they are caramel. Zygophyllum gaetulum, Oudneya africana.

Abstract

This study aims to assess the impact of climate change on monthly rates for minimum temperature for the winter months in Misrata Area, by analysing the monthly averages of data from 1970-2010, to see the general trend, of the minimum temperature during the last 40 years, using a variety of statistical methods, including: simple linear regression, t- test, and the results of the study showed that trends for the increase in monthly rates for lesser temperature for winter Misurata Area at the level of statistical significance is less than 0.05. المقدمة