Journal of Basrah Researches (Sciences)

The Chemisorptions of Hydrogen atom on tungsten surface is studied in this work . Our study
has two mean goals , the first is to study the dependence of coupling term on the atomic energy levels
occupation through out the chemisorptions process . The second is to study the chemisorptions process
for the same system in the existence of external magnetic field . For this purpose extended model
calculation has presented to calculate the atomic energy levels occupation numbers and all the related
chemisorptions functions . The image and correlation effects are all taken into consideration . The
localized states are also determined and calculated as well as their occupation numbers which taken
into consideration in the chemisorptions energy calculation . Throughout our calculations , the general
features of the system under consideration have investigated using physical initial conditions getting
use of the coupling - occupation numbers dependence . Our calculations show two types of solutions
from its ranges for coupling strength values are characterized . The first is weak coupling where the
solution is magnetic with no localized states . The second is strong coupling where the solution is
nonmagnetic with localized states . And for the second goal , the chemisorptions process for the
system under consideration in the existence of external magnetic field is studied. Since the external field effect is added as shifts with finite values to the atomic levels . The atomic levels occupation
numbers and the related chemisorptions functions , the localized states and this occupations and the
energy are all calculated in the existence of the external field for the three coupling ranges . Discussion
and important conclusions about the band width , the condition for the localized states existence , the
image and the correlation effects ,are presented .

This paper presents the numerical study of a generelized Henon system to show various types of
dynamical behaviors using time series, attractor's as well as the spectral distribution of the main
variable. Results indicated the generation of new types of attracters with severe instabilities.

In this study ,a mathematical model to study the chemisorption of two interacting atoms on
solid surface in the presence of laser field is presented . Our study has aim only , the study the effect
of laser field on determining the ionization and dissociation states to describe the molecule – surface
interaction dynamics . Our mathematical model is based on the occupation numbers formula that
depends on the laser field and which is derived according to Anderson model for single atom
adsorbed on solid surface. Occupation numbers formula and chemisorption energy formula are
derived for two interacting atoms (as a diatomic molecule )as they approach to the surface taking
into account the correlation effects on each atom and between atoms as well as the image effect on
each one . This model is characterized by the obvious dependence of the relations on the system
variables and the laser field characteristics which gives precise description for the molecule –
surface interaction dynamics (i.e. the charge and spin on the interacting atoms ) as a function of the
normal distance from the surface and the distance between atoms .Our mathematical model is
applied to the H2/W(100) system for academic and experimental reasons, where the moleculesurface interaction dynamics is investigated by calculating the occupation numbers and all the
chemisorption functions as a function of all variables when the distance between the atoms is
parallel to the surface.It is found that the type of interaction between the atoms and surface ,
whether it is repulsive or attractive , is determined by the laser strength where the repulsion between
the two atoms increases with the laser strength increasing . The orientation effects are taken into
account throughout the broadening functions due to the coupling with surface energy levels and as
well as due to the laser field.Extended calculations for all functions, that describe the system
dynamics, are presented as a function of all variables as well as the orientation angle. By comparing
the orientation effect and laser field effect, it is concluded that the laser field effect is dominant .It is
found that by taking the orientation effects, the interaction is repulsive for both strength values that
used (0.1a.u.,0.2a.u.) in this research as compared with the case of incorporating laser field only or
orientation effect only. So it makes sure that the laser field as well as the orientation effects can be
consider as a tool to control the ionization and dissociation processes that happen on the solid
surface

Detailed of anatomical study of stem and petiole of ( 3 ) species of
Atraphaxis L. , ( 2 ) species of Calligonum L. , (1) spicies of Eme Neck
., (1) species of Fagopyrum Mill . , (1) species of Oxyria Hill. , ( 2 )
Species of Pteropyrum Jaub. & Spach . and ( 1 ) species of RheumL.
Present in Iraq were described .
The result showed that the anatomical characters of the stem such as stem outline , number of
vascular bundles , size of pith , chlorenchyma , collenchyma and sclerenchyma tissues are of
considerable taxonomic value at the specific or generic level and can be used for taxa separation .
The number of vascular bundles of petioles appeared vaiable between 6 to 8 in most species
except Pteropyrum neoanum Boiss. ex.
Meisner which contain one central vascular bundle surrounded by
complete ring of tanniferous cells . All the petiols of species examined
have large numbers of drusses crystals except Fagopyrum esculentum
Moench .

The present study was conducted to investigate the ability of the worm Namalycastis indica
to accumulate some heavy metals in its tissues. The heavy metals measured were Cadmium (Cd),
copper (Cu), nickel (Ni), and cobalt (Co) after the exposure period for (14) days. Further more the
study included, the effect of these metals on the growth of N. indica. The worms were grown in media
containing different concentrations of the above heavy metals. These concentrations ranged from (5 to
250) ppm. A flame atomic absorption spectrophotometer was used to measure the concentration of the
heavy metals in the tissues of worm. The worms showed high ability to accumulate Cd, Ni, Cu and
Co. An increase of heavy metals concentrations in the worm tissues were associated with the increase
of these metals in media. The maximum concentration of Cd, Ni, Cu, and Co in the worm tissues were
(28.31, 12.22, 22.63, 10.67) ppm respectively. At a concentration (250 ppm) in the media. Different
concentrations of Ca, Ni, and Cu resulted significant loss of weight of the worms .The Co showed the
lowest effect on weight decrease of the worms, compared with the other metals. It was also clear, the
increasing effect of heavy metals on worms growth, with concentration increasing showed the
maximum effect on weight loss Ca followed by Ni, Cu and Co, when worms grown in media
contained (250 ppm) of the metals.

In this study , the antimicrobial and antifungal effect of aqueous and alcoholic extracts of
Artemisia absinthium were assayed against bacteria like Staphylococcus aureus , Escherichia coli,
Pseudomonas aeruginosa , Proteus vulgaris and fungi like Aspergillus niger , Aspergillus terrus
and Aspergillus fumigatus .
The result indicated that the alcoholic extract gave clear inhibitory activity against all the tests
bacteria under concentration by the range of ( 20-30) mm but the aqueous extract gave inhibitory
activity against S.aureus only , while both the extract don’t gave any inhibitory activity against
fungi.The MIC value was detirminated by the range from ( 50-150 ) mg/m

Laser light has special characteristics features compared to conventional light sources
made it the prime source in different scientific disciplines . The present study confirmed
that low level laser therapy (LLLT) can accelerate the wound healing process of skin by
using two visible ( red 632.8 nm and green 532 nm ) light . The study included (90) mice
regardless of sex divided into control (10 mice ) and study groups (80 mice). Injury to skin
was done for both groups . The control group was left for healing without any interventions
at usual conditions . The study ( treated ) group consisted of 80 mice divided into two
groups (40 mice ) each . The first group subdivided to four small groups (10) mice each
and were exposed to the wavelength 632.8 nm at two different energy densities . The
second group was subdivided too by the same manner and exposed to the wavelength 532
nm at two different energy densities . Skin biopsy from the wounds was taken from all
mice for histopathological study at ( 1,3,5,7) days of injury . The study revealed that laser
acceleated inflammatory proliferative phases. The best results for healing wound at laser
632.8 nm at energy density of 0.708 J/cm2
while for the laser 532 nm was of 0.271 J/cm2
.