ISSN: 1817-2695

Volume 36, Issue 4

Volume 36, Issue 4, Autumn 2010, Page 1-65


LASER FIELD EFFECTS ON THE CHEMISORPTION PROCESS

I. Q. Taha; J. M. Al-Mukh and S. I. Easa

Journal of Basrah Researches (Sciences), Volume 36, Issue 4, Pages 1-21

Detailed theoretical treatment and model calculations for describing the interaction between species and solid surface in the presence of a monochromatic electromagnetic field (laser field) throughout the chemisorption process, have been developed.
Our theoretical treatment [1,2] for the scattering process in the presence of laser field and the well known Anderson model for atomic chemisorption [3,4] are the basis in deriving our theoretical treatment in the case of the chemisorption of the species on solid surface in the presence of laser field. The derived occupation number and the chemisorption energy are calculated as a function of laser parameters and as a function of normal distance from the surface as the adatom approaches to the surface. The model calculation is applied to the systems Na/W(111) and H/Cu(110) for their experimental and academic importance. Many important features are explained concerning the adatom charge state and the bonding type. From our results, one can conclude that the laser field is a tool of ionization , which is experimentally the truth.

Thermal Conductivity and Modification The Formula of The Hole(Electron) – Phonon Scattering:

Ahmed. S. Mahdi

Journal of Basrah Researches (Sciences), Volume 36, Issue 4, Pages 22-28

Using Callaway’s Model, thermal conductivity of antimony in the temperature range between (0.4-2.4)K was calculated. Specialized present study to modification the formula of hole(electron)-phonon scattering relaxation rate by using phonon wave vector which is located in the formula of the hole(electron)-phonon relaxation rate, instead of Debye dispersion relation ( ). In addition to scattering the phonons by holes(electrons) ,the boundary scattering, point defects and three-phonon scattering (normal & umklapp) were taken into account to find the total relaxation rate. Good agreement between theory and experiment is obtained in temperature rang (0.4-2.4)K.

The Displacement Criteria in Fibrous Crystallized Gypsum Veins

Journal of Basrah Researches (Sciences), Volume 36, Issue 4, Pages 29-41

This paper deals with gypsum veins in Mudstone and Siltstone in the South Hemrin area (NE Muqdadia) in the eastern part of Iraq. The criteria which characterize displacements in fibrous crystallized gypsum veins have been studied and two types recognized:
1-The criteria which appear on the vein surfaces. These criteria give precisely the direction and type of displacement. The determination of the chronology of successive displacements along the veins is hindered because the effects of the last displacement usually erase features associated with the first. The types of displacement features are: cavities and convexities, tectonic tool marks, accretionary growth steps, teeth and sheet structures and wavy structure.
2-The criteria which appear in vein sections. These criteria give with some difficulty the type and direction of the displacement without precisely determining the age of deformation in relation to the inferior and posterior displacement. The types of displacement features in this case are: fibers perpendicular to vein walls, fibres oblique to vein walls, bent fibres, secondary wall-parallel fractures, conjugate shear fractures, en- echelon fractures and en- echelon veins.

Study of alkaloid extract from Citrullus colocynthis fruit and its antimicrobial activity Screening

Y. A. Alhurba and S. Ali.Mohamad; M. Y. Al-hejjaj

Journal of Basrah Researches (Sciences), Volume 36, Issue 4, Pages 42-47

The antimicrobial activity of alkaloid extracted from Citrullus colocynthis were examined against five local isolates bacteria (Escherichia coli, Staphylococcus aureus, Streptococcus sp., Bacillus subtilis, and Klipsella sp.) using agar disc diffusion method, beside two traditional antibiotics (Amoxicillin and Cephalosporin). The most active antimicrobial activity of extracted alkaloid were shown against Strep. sp, the Cephalosporin showed the most antimicrobial activity. Broth dilution methods were used to determine the minimum inhibitory concentration (MIC) for the extracted alkaloid. The study showed that MIC values of 600 µg/ ml, 3000 µg/ ml, against Staph. aureus, and E. coli isolates respectively.

Effect of exposure time of laser He-Ne 632.8 nm,1 m/watt on wound healing process in rabbits

Journal of Basrah Researches (Sciences), Volume 36, Issue 4, Pages 48-54

The objective of this work was to assess a compare grossly and microscopically, the effect of exposure time of He-Ne 632.8 nm. 1 m/watt
in wound healing in rabbits. For this purpose 15 adult male rabbits were used, divided into 3 groups, 5rabbits in each group. Xylazine 20 mg/kg and ketamine 10mg/kg used I/m to induce general anesthesia. Surgical open wound was made and immediately. The 1st,2nd and 3rd groups were exposure to 632.8 nm. 1 m/watts low level laser during 3,5 and 7minte. All the groups exposure was done on 1st, 3rd , 5th and 7th day. The spacement for histological studies taken on 3rd, 5th and 7th days and immediately kept in 10% buffer formaline for 24 hours. The result revealed that among three groups were the wound closed by fifth day under microscopic examination the slide show complete remodeling and natural skin layers of dermis, epidermis in comparison with groups first and 3rd. The 1st group shows fibroblast and collagen fibers fill the gap, while the third group shows mature normal structure at same stage.

In vitro study of the effects of green, red, and black tea and coffee extracts on the mammalian intestinal smooth muscle motility(contractions & relaxations)

Nawal K.Ibraheem; Haithem J.Kadhum; Mustafa A.Hussein; and

Journal of Basrah Researches (Sciences), Volume 36, Issue 4, Pages 55-59

Tea, is the most consumed drink in the world. Green tea, is a non-fermented tea and it contains more catechins than black tea. Red tea is gaining recognition for its free of caffeine, low tannin, and it contains the antispasmodic principle . On the other side, coffee, is a highly acidic drink and it contains the highest caffeine, but tea provides only 1/2 – 1/3 as much. In the present study we tried to investigate the effects of green, red, black tea and coffee extracts on the mammalian intestinal smooth muscle motility in an attempt to rationalize some of their medicinal uses.
Segments of jejunum was isolated from rabbits intestine and submerged in Tyroid's solution which has the same compositions of extra cellular fluid of the rabbit, they were exposed to different volumes and concentrations of green, red, black tea and coffee extracts and the response were recorded by a lever inject ink on a slowly moving drum. Green tea and red tea extracts induced a dose-dependent inhibitions of spontaneous activity of the jejunum, they induced a significant decrease in the amplitude of jejunal contractions and relaxations (motility), while the black tea extract does not show any noticeable effect on rhythmic spontaneous jejunal motility.
On the contrary, coffee extract , induced a significant increase in the amplitude of the spontaneous activity of the jejunum in a dose-dependent manor. This study provides a mechanistic basis for the medicinal uses of tea and coffee.

Spectrophotometric Determination of Silver by New Azodyes Deriven From 2-Thiobarbituric Acid

Journal of Basrah Researches (Sciences), Volume 36, Issue 4, Pages 60-65

This study describe the use of new azodyes reagents 5-( 2,3- dihydro-1,4-phathalezindion- azo) -2-thiobarbituric acid ( L1 ) and 5-(2-thiobarbituric acid azo )-phenyl-4-acetic acid (L2) as sensitive and selective analytical reagents for the determination of Ag(I) spectrophotometrically. L1 and L2 react with Ag+ at pH ( 9 and 10 ) respectively
to form colored complexes of 1 :2 stoichiometry which show a maximum absorbance of 540 and 425 nm. of molar ratio absorbitivity 0.59 X104 and 1.63 X104 l.mol-1.cm-1 respectively. fixed optimum conditions were constructed, precision , accuracy, R.S.D.and correlation factors. The Beers law was obeyed up to 25 and 7.56 ppm. respectively.The stability constants of complexes were determined.