2020-08-11T23:51:26Z
https://jsciences.ut.ac.ir/?_action=export&rf=summon&issue=2562
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1998
9
1
IN VITRO TECHNIQUES COUPLED WITH
IRRADIATION FOR SELECTION OF BASMATI
RICE MUTANTS BE'ITER ADAPTED TO SALINE
ENVIRONMENTS
Among different doses of gamma rays, 1.5 kR induced 71.84% callus in Basrnati
rice in amodified MS medium and 2% redifferentiation under anon-saline environment,
20% callusing response with 7.5%,2.8% and 2.5% redifferentiation was induced by
2.0 kR at electrical conductivity (EC) of 4,s and 6 dS.m of NaCl respectively, in
regeneration medium. A non-irradiated non-saline environment revealed a
redifferentiation percentage of 48.28% with a regeneration percentage of 6.9%, in
addition to one albino plant, while a non-irradiated saline environment indicated 4%
regeneration at 4 dS.m-I EC of NaCl. The results based on these studies are discussed
1998
03
01
https://jsciences.ut.ac.ir/article_31356_86844e1faa73a31498e4c3600308b163.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1998
9
1
PURJFICATION OF HIGH MOLECULAR WEIGHT
CELLULOLYTIC ENZYMES FROM
CELLUWMONAS sp. STRAIN 0
Purification of extra-cellular cellulolytic enzymes from C e l l u l o mssp. strain 0,
isolated from forest soil in the north of Iran , was studied by using gel filtration and ion-exchange chromatography. Two endo-glucanases (Endo-I & Endo-II) and one exo-glucanase (Exo-I) were purified to hornogenity . The purified enzymes had
molecular weights of about 39.000,70.000 and 90.000 daltons for Endo-I, Endo-II
and Exo-I, respectively. Heavy metal ions, like Fe and CU inactivated the
enzymes by about 80%, while Zn and CO had no effect on the enzyme activities
1998
03
01
https://jsciences.ut.ac.ir/article_31357_391c25f27024969d2cc77800d7b5c612.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1998
9
1
AMPEROMETRIC MICROBIOSENSOR FOR THE
DETERMINATION OF CHOLINE
The construction and performance of an amperometric microbiosensor for the
determination of choline chloride by immobilizing choline oxidase on a cellulose
acetate membrane are described. The procedure of choline determination involved
the electrochemical detection of enzymatically generated hydrogen peroxide. This
microsensor has a linear response between 0.038-0.1 mM choline chloride. The
response time is 1-2 minutes. The optimal working conditions for the microsensor
were 0.1 M TRIS-HCl, pH = 8 at 30°C
1998
03
01
https://jsciences.ut.ac.ir/article_31358_3e5df5649acee20c148141d101bedb5e.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1998
9
1
THE STRUCTURE OF [P$(ReO,) (p-dppm),]
[Re0,7,2
Acluster[ pt (Reo )(?-dppm) ][Reo ],2 [dppm=ph Pch ] with
oxidaton of [pt Re(CO) ](?-dppm) ][PF ] is prepred . Crystals are triclinic,pl; a=
14.154(4)?, b=14.213(3) ?,c = 20.522(4) ? , a = 78.938(14)?, ?= 75.812(19) ? , ?=
74,957(22) ? ;v = 3828.9(1 5) ? ,z =2 ; Eraf-Noniu CAD4 difhctorneter with Mo-
K radiation, ? = 0.71073 ? ; R = 0.069, R = 0.077 for 284 parameters and 5414 reflections with I 3?(I).
1998
03
01
https://jsciences.ut.ac.ir/article_31359_9ab02958505182f96cc5460848e8f100.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1998
9
1
SYNTHESIS OF 3-ARYLMETHYL-4-
THIAZOLIDINE-CARBOXYLIC ACID-2-ONES
AND 2-THIONES
Barium salts of dibenzylidene cystines 8a-c were obtained from the reaction of Lcystine
with benzaldehyde or its derivatives in the presence of barium hydroxide.
Their reduction with zinc and hydrochloric acid in methanol yielded the Narylmethylcysteines
?9a-c?. These can, in turn, be converted by esterification into the
methyl esters ?10 a-c. ?Reaction of N, N'-carbonyl diimidazole (Im CO) or N, N'-
thiocarbonyl diimidazole (Im Cs) with thiols 9a-c and 10a-c gave 3-arylmethy-4-
thiazolidine-carboxylic acid-2-ones 3a-c or 2-thiones la-c and their methyl esters 4ac
and 2a-c respectively. From the reaction of P S with 3-arylmethyl 4 thiazolidine
crespectively acid-2-ones 3a-c and 4a-c the derivatives of 2-thiones 2a-c and la-c were
obtained as well
1998
03
01
https://jsciences.ut.ac.ir/article_31360_38614106bd88c97e8ddbb986526cd83c.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1998
9
1
SELECTIVE CYCLIZATION OF
2-PROPARGYLTHIO-6-METHYL-PYRIMIDIN-
4(1 H)-ONE TO THIAZOLO [3,2-a] PYRIMIDIN 7-ONE
Selective transformation of 2-propargylthio-6-methyl-pyrimidin-4(1H)On e (2) to 3,5-dimethyl-7H-thiazolo [3,2-a] pyrimidin-7-one (3) is performed under the conditionof base catalysis .
For elucidation of structure, palladium catalyzed cyclization reaction of (2) was carried out and the structures of the products were assigned (5) and
(6). These compounds underwent isomerization to (3) and (4) respectively. From this
result, regioselectivity by base catalysis was concluded
1998
03
01
https://jsciences.ut.ac.ir/article_31361_9885a369c1d8a0a7f0988779257b4879.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1998
9
1
SYNTHESES, ANTIFUNGAL AND
ANTIBACTERIAL ACTIVITIES OF
SUBSTITUTED 1,2, CTRIMOLES
The reaction of readily available 1 -methyl-4-nitropyrrole-2- carboxylic acid (1)
with thionyl chloride afforded the corresponding acyl chloride 2. The reaction of
compound 2 with thiosemicarbazides yielded 1-(1 -methyl-4-nitrop yrrole-2-carbony1)-
thiosemicarbazides (3) which cyclized in basic medium to 5-(1-methyl-4-nitropyrrole-
2-y1)-2,4-dihydro-3H- l,2,4-triazole-3- thione 4. Alkylation and subsequent oxidation
of 4 gave 6. The antibacterial and antifungal activities of 6a to 6f against a number
of microorganisms were determined. Only compounds 6b and 6c had moderate
activity against Aspergilus niger
1998
03
01
https://jsciences.ut.ac.ir/article_31362_2a403d006c5d87cb2930b284815a2269.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1998
9
1
BUCHITE FROM FESHARK AREA NORTHEAST
ISFAHAN CENTRAL IRAN:
A PRELIMINARY STUDY
Buchitic glassy rocks appear within the skarn of contact metamorphic aureole of
Feshark intrusive complex situated 30 km northeast of Isfahan. Intrusive complex is
a multistage intrusion . Noritic gabbro is the first inttrusion which is invaded later on
by a granitic melt. Granitic melt has metasomatically altered the gabbro and as a
consequence a suite of hybrid rocks like monzogabbro, monzodiorite, and diorite has
been formed. A remnant of the original rocks in buchite is biotite bearing feldspathic
quartzite or biotite gneissic rock, by fusion of which a granitic melt is forrned.
Subsequent supercooling of this melt resulted in glassy buchitic rock. Buchites of
Feshark have a glassy, columnar jointed character at bothcontacts with the skarn host
rock and a semiglassy character with contorted foliation in the middle part. Buchites
are generally very rich in glass, in which minute, very rare, fine crystals of high
disordered sanidine, high disordered oligoclase, mullite, orthopyroxene, Fe-Ti oxides,
corundum and biotite have been recognized. This mineral assemblage strongly
reflects the condition of sanidinite or spurrite-merwinite facies [14] which implies the
existence of spurrite-merwinite facies assemblages in skarn host rock. The lack of
such an assemblage is interpreted as resulting from the rnetasomatic and retrogressive
effect of granite intrusion which reverted very high grade assemblages of spurritemerwinite facies to normal pyroxene hornfels assemblages in host skarn rock. It is probable that the buchitic melt originated in thedeeperpart of the contact metamorphic aureole and was injected into fractures of a higher level
1998
03
01
https://jsciences.ut.ac.ir/article_31363_a2861dec7d96f683dd31290a154e03f1.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1998
9
1
FREE SEMIGROUPS AND IDEMPOTENTS
IN T
The known theory for an oid T shows how to find a subset T of ?T, which is a
compact right topological semigroup [I]. The success of the methods in [2] for
obtaining properties of-T has prompted us to see how successful they would be in
another context. Thus we find (Theorem 4.8) that T cont ains copies of free
semigroups on 2? generators, is an immediate consequence of the stronger result and
that it contains a cancellative subsemigroup (Theorem 4.7). Also obtained is a new
proof of the known result in [6] that T contains 2? idempotents
1998
03
01
https://jsciences.ut.ac.ir/article_31364_b3c56417c37ffc038429db0f8052e5f8.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1998
9
1
NUMERICAL STUDY OF NONLINEAR
VOLTERRA INTEGRO-DIFFERENTIAL
EQUATIONS BY ADOMIAN'S METHOD†
The main purpose of this paper is to consider Adomian's decomposition method
in non-linear Volterra integro-differential equations. The advantages of this method,
compared with the recent numerical techniques (in particular the implicitly linear
collocation methods) , and the convergence of Adomian's method applied to such
nonlinear integro-differential equations are discussed. Finally, by using various
examples, the accuracy of this method will be shown
1998
03
01
https://jsciences.ut.ac.ir/article_31365_bec3005aa1516be1889585f6ab6e0f68.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1998
9
1
ON THE PERIODIC SOLUTIONS OF A CLASS OF
nTH ORDER NONLINEAR DIFFERENTIAL
EQUATIONS *
The nth order differential equation x + c (t )x + ƒ( t,x) = e(t),n>3 is
considered. Using the Leray-Schauder principle, it is shown that under certain
conditions on the functions involved, this equation possesses a periodic solution.
1998
03
01
https://jsciences.ut.ac.ir/article_31366_8c8d837537a008e02f3aa01625724fb6.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1998
9
1
A QUARTIC POTENTIAL FOR THE NUCLEONIC
QUARKS
We assume that each valence quark in a nucleon is in a phenomenological
modified harmonic oscillator potential of the form: ( l+yo) (ar +br+cr +dr ), where
a, b, c and d are constants and ? is one of the Dirac matrices. Then by making use of
a suitable ansatz, the Dirac equation has a very simple solution which is exact. We
then have calculated the static properties of the nucleon in the ground state with and
without center of mass correction. The results are encouraging. PACS index 12.35
kW and 13.40 fn
1998
03
01
https://jsciences.ut.ac.ir/article_31367_37d03fcb69fa1a2c213458bab0cdfa96.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1998
9
1
QUANTUM TUNNELING IN MEDIUMS WITH
LINEAR AND NONLINEAR DISSIPATION
We have applied the method of integration of the Heisenberg equation of motion
proposed by Bender and Dunne, and M. Kamella and M. Razavy to the potential
V(q) = v q - µ q with linear and nonlinear dissipation. We concentrate our
calculations on the evolution of basis set of Weyl Ordered Operators and calculate the
mean position , velocity , the commutation relation [q, p], and the energy of particle.
According to our results, the particle which is confined in the well at t= 0, has some
oscillations before tunneling. If dissipation is lproportional to velocity it inhibits
tunneling but when it is quadric in velocity it facilitates tunneling. Thus, we can
continue our cdculation easily for every power of velocity
1998
03
01
https://jsciences.ut.ac.ir/article_31368_93fffd96653d411246a91b25a4596084.pdf