دانشگاه تهران
بین المللی علوم (منتشر نمی شود)
5
0
2004
10
22
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30809
FA
Amini,
F
Ehsanpour,
A.A
Journal Article
1970
01
01
Plant breeding improvement and using conventional methods isdifficult and relatively time consuming. Biotechnological methods,
especially tissue culture and cell suspension culture can be used to
transfer desirable traits such as salt resistance to forage plants such as
Medicago. Stem, leaf and root explants belonging to three Medicago
species: rigidula, scutellata and sativa, were initially cultured on MS
(Murashige and Skoog, 1962) medium containing 2 mg/L yeast
extract, 2mg/L 2,4-dichlorophenoxyacetic acid (2,4-D), 2 mg/L a-naphthaleneacetic
acid (NAA), 1.5 mg/L benzyladenine (BA), 0.5
mg/L Thiodizuron (TDZ) and 2 mg/L Kinetin. Only M. sativa
produced callus and was able to produce cell suspension in liquid
medium. Viable cells were then transferred to the same liquid medium
with 0, 30, 60, 90, 120 mM NaCl and finally, tolerant cell lines were
selected at 90 mM NaCl according to packed cell volume (PCV
https://iijs.ut.ac.ir/article_30809_a9a0d4533ace24098b3d42d5f9866f8e.pdf
دانشگاه تهران
بین المللی علوم (منتشر نمی شود)
5
0
2004
10
22
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30810
FA
Irfan
Kandemir
Mohammed
Moradi
Journal Article
1970
01
01
Apis mellifera meda is one among those two dozen subspecies which
are the most widely distributed in the world. While in our first
description, its distribution is restricted to North Persia, Lencoron (on
the Caspian Sea coast), in later studies it extends westward, to the
north of Iraq and Syria, and to the southeastern parts of Turkey. To
investigate the geographic variation and population structure of the
honey bees of northern Iran that are among the least studied
populations of Apis mellifera, samples were collected in the Alburz
mountains, in the south of the Caspian Sea.
A total of 46 colonies were sampled from six different locations
(three in the highlands: Khanchay, Sefar, Zanjan; and three in the
lowlands, Gholikandy, Gultepe and Duzteran Fig.1). Out of six
enzymes assayed, four were found to be polymorphic (Pgm, Hk, Mdh,
and Est) and two (Pgi and Me) displayed invariant banding patterns.
Gene frequencies, enzyme heterozygosities and usefulness of gene
frequencies to Hardy-Weinberg expectations were analyzed with the
BIOSYS-1 package. The overall grand mean heterozygosity for all
populations was calculated as 0.052±0.036. A Distance Wagner
analysis based on the Prevosti distance divided the honey bee samples
into two groups according to their origin from lowlands and
highlands. Morphmetric variations of the colonies were assessed using
parameters measured from hind and fore-wing and from legs.
Different multivariate analyses were applied for the determination of
different honey bee populations in the Alburz Mountains in Iran
https://iijs.ut.ac.ir/article_30810_2ef18aaa01703c3ddc309e2a4b09662a.pdf
دانشگاه تهران
بین المللی علوم (منتشر نمی شود)
5
0
2004
10
22
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-
30811
FA
Akbar
Vahdati
Jamal
Moshtaghian
Lida
Momeni
Taji
Afrooz
Journal Article
1970
01
01
Recombinant human erythropoietin (rHuEpo) is a glycoprotein
hormone that stimulates erythropoiesis. This study was designed to
investigate the effects of rHuEpo on red blood cells (RBCs),
hemoglobin (Hb), hematocrite (Hc), reticulocytes and creatinine in
newborn, young, and adult rats. Three doses of rHuEpo (50, 100 and
200 IU/kg) were administrated to animals via subcutaneous injections,
twice a week for a period of six weeks. RBCs were counted using H1
autoanalyser. Hb, Hc, reticulocytes and creatinine contents of the
blood samples were determined. The data was analysed using one-way
ANOVA, Tukey test and paired samples. There werea dose dependent
increases in RBCs (2-12%), Hb (7-53%), Hc (5-49.6%) and creatinine
(11-14%). However, reticulocytes showed a dose dependent decrease
down to 2.1-6.3%. The maximum and minimum changes were
observed in newborn and young rats. The results suggest that rHuEpo
may affect hematopoietic stem cells and modify other progenitor cells
to erythroid progenitors. Subsequently, reticulocytes were
differentiated to RBCs. The kidney performance to excrete creatinine,
was also reduced under the influence of rHuEpo
https://iijs.ut.ac.ir/article_30811_973473afc14d49bca4bdd13e5a78e8db.pdf
دانشگاه تهران
بین المللی علوم (منتشر نمی شود)
5
0
2004
10
22
-
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30812
FA
A.
Badiei
S. A. Seyyed
Ebrahimi
S.
Alamolhoda
Journal Article
1970
01
01
A novel sol-gel auto-combustion method has been used to synthesize
ultra-fine particles of strontium hexaferrite. The gels were prepared
from metal nitrates and citric acid by various molar ratios of Fe/Sr and
trimethylamine as pH adjusting agent. The results showed that the gel
exhibits a self-propagating behavior after ignition in air. The
combustion product was calcined at 800 °C to form strontium
hexaferrite. The obtained powders were characterized by XRD, SEM
and FTIR techniques. The optimum molar ratio was Fe/Sr=10 with
crystallite size about 37 nm. The FTIR and XRD results showed that
the combustion product contains ? -Fe2O3 as the main phase and some
amount of SrCO3 and ? -Fe2O3
https://iijs.ut.ac.ir/article_30812_9424d6d2f7be09ddbf31566a5b5423e0.pdf
دانشگاه تهران
بین المللی علوم (منتشر نمی شود)
5
0
2004
10
22
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-
30813
FA
A.
Mahboubi
L.Gonzalez
M.
Najafi
R.,
Moussavi-Harami
V.
Yahya-Sheibani
Journal Article
1970
01
01
The Lower Cretaceous sediments (mainly limestones with a few
horizons of sandstones and conglomerates) are present south of
Mashhad along the Binalood Mountain range. Petrographic studies
reveal that the carbonate rocks were deposited on a shallow carbonate
platform of ramp type including open-marine, shoal, lagoon and tidal-flat
facies belts. Diagenetic processes include compaction,
cementation, micritization, replacement (silicification), neomorphism
and fracturing.
Oxygen and carbon isotope signatures of the limestones range from
-11.2 to -2.1‰ and 0.2 to 4.3‰ PDB respectively. This variation
reveals meteoric and burial diagenetic environments. Decreasing trend
in the value of oxygen isotopes with increasing the amount of Fe and
Mn as well as decreasing Na and Sr also indicate that these rocks may
have been exposed to the meteoric diagenetic environment too. The
calculated temperature for the ambient water in which calcite was
deposited is about 26 ? C
https://iijs.ut.ac.ir/article_30813_05b9fb1610aaaee00cb81822d0450525.pdf
دانشگاه تهران
بین المللی علوم (منتشر نمی شود)
5
0
2004
10
22
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30814
FA
Beiranvand.
B
Kamali.
M.R
Journal Article
1970
01
01
https://iijs.ut.ac.ir/article_30814_242603c13a0763e19070dcc18ac57fd2.pdf
دانشگاه تهران
بین المللی علوم (منتشر نمی شود)
5
0
2004
10
22
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-
30815
FA
Amir Mansour
Farahbod
Conrad
Lindholm
Hilmar
Bungum
Mitra
Alahyarkhani
Mohammad
Mokhtari
Journal Article
1970
01
01
The main purpose of the present study is to develop a comprehensive
Moho depth map and crust and upper mantle velocity model for Iran.
This will allow for more precise computation of travel time and
thereby also more precise hypocenter estimation of the recorded
events in Iran.
For this purpose all available depth and velocity data relevant to
this region has been matched and compiled. In the locations that there
were no local data, available global data has been replaced. Based on
these results Iran has been divided into 8 regions of varying seismicity
and velocity structure
https://iijs.ut.ac.ir/article_30815_9b26a8221b8b718f0677acafdab25d92.pdf
دانشگاه تهران
بین المللی علوم (منتشر نمی شود)
5
0
2004
10
22
-
-
30816
FA
G. Nakhaie
Jazar
M.
Mahinfalah
M. Rastgaar
Aagaah
Marcelo
Epstein
Journal Article
1970
01
01
Solitary waves are coincided with separatrices, which surround an
equilibrium point with characteristics like a center, a sink, or a source. The
existence of closed orbits in phase plane predicts the existence of such an
equilibrium point. If there exists another saddle point near that equilibrium
point, separatrix orbit appears. In order to prove the existence of solution for
any kind of boundary value problem, we need to apply the fixed-point
theorems. The Schauder’s fixed-point theorem was used to show that there
exists at least one nontrivial solution for equation of wave motion in arteries.
The equation of wave motion in arteries has a nonlinear character, and the
amplitude of the wave depends on the wave velocity. There is no general
analytical or straightforward method for prediction of the amplitude of
solitary waves. Therefore, the solution must be found by numerical or non-straightforward
methods. The methods of saddle point trajectory, escape-time,
and escape-energy are introduced and shown that they are applicable
methods with enough accuracy. Application of any of these approximate
methods depends on the equation of motion, and the user preference.
Applying a phase plane analysis, it was shown that the domain of periodic
solution is surrounded by a separatrix. The separatrix is coincident with the
desired solitary wave. The amplitude of the solitary wave is the most
important characteristic of the wave, and will be predicted with each of the
above methods.
https://iijs.ut.ac.ir/article_30816_e866e7f3d8577f7ac9fa0513f6a977fa.pdf
دانشگاه تهران
بین المللی علوم (منتشر نمی شود)
5
0
2004
10
22
-
-
30817
FA
E.
Pasha
M.
Khodabin.G.R
Mohtashami
Borzadran
Journal Article
1970
01
01
In this paper we present an entropy characterization of general
exponential model and use entropy of regular model to construct a
testing of hypothesis for parameters of some common distributions
such as normal, exponential, gamma and beta. Furthermore we use
these concepts and methods to construct interval estimators for
) ( H ? and for ? if ) ( H ? is one to one, where ) (? H is Shannon’s
entropy of X with density function ) (x f ? or probability mass function
) ( x X P =? .
https://iijs.ut.ac.ir/article_30817_9c6679230162a9ddb6d560a8f6aa5cf9.pdf