دانشگاه تهران
بین المللی علوم (منتشر نمی شود)
1
0
2001
04
21
-
-
30757
FA
Ali
Yassaghi
Journal Article
1970
01
01
https://iijs.ut.ac.ir/article_30757_47a39180b8f34223ca36368a53ef49e7.pdf
دانشگاه تهران
بین المللی علوم (منتشر نمی شود)
1
0
2001
04
21
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-
30758
FA
Houri
Sepehri
Roya
Zoraghi
Ali, Haeri
Rouhani
Journal Article
1970
01
01
Recent studies have indicated that several plant extracts reputed to be lactogenic are capable of inducing ?-casein synthesis in mammary epithelial cells. This enhancement is mediated through a stimulation of prolactin release from lactotropes in anterior pituitary. Therefore it is admitted that these extracts are capable of stimulating prolactin secretion from hypophysis. A partial purification of these extracts, revealed that their active compounds are pectin in most cases and ?-glucan in other cases. In this work, the effect of various concentrations of both pure pectic acid and ?-glucan on prolactin secretion from ewe hypophysis fragments is investigated. It is shown that pectic acid in the 50-150 ?g/ml range concentration and ?-glucan in the 200-400 ?g/ml range concentration are capable of stimulating prolactin secretion significantly (P<0.05, P<0.01), from hypophysis explants.
https://iijs.ut.ac.ir/article_30758_01ba4de6c9073d089364c76f2b33a31d.pdf
دانشگاه تهران
بین المللی علوم (منتشر نمی شود)
1
0
2001
04
21
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-
30759
FA
M. Hossein
Alamatsaz
Journal Article
1970
01
01
The aim of this note is to characterize a class of distributions whose characteristic functions ?(t) for all ? > 0 satisfy the relation
?t?R
where H and H? are positive real constants. First, it is observed that these distributions turn out to belong to the well-known class of infinitely divisible distributions. More specifically, they are strictly stable and thus absolutely continuous, self-decomposable and unimodal. But they are not strongly unimodal except for the case of H=2H. Then some representations are obtained for ?(t). Finally, some characterizations are arrived at for the Cauchy and N (0, ?¬2); 0< ?¬2 < ?; distributions.
https://iijs.ut.ac.ir/article_30759_4d24277da1c2ee3ae149e4c740b07105.pdf
دانشگاه تهران
بین المللی علوم (منتشر نمی شود)
1
0
2001
04
21
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-
30760
FA
Ali Reza
Ashrafi
Journal Article
1970
01
01
The aim of this paper is to construct an algebraic hyperstructure over a set G corresponding to a Boolean algebra B and a function S:G B. In order to accomplish this goal we will need to define a hyperoperation on the set G. We define,
a b =
and prove that if the image of G is a ?-semilattice or constitute a partition of 1 in B, then (G, ) is a hypergroup.
1991 Mathematics Subject Classification: 20N20
https://iijs.ut.ac.ir/article_30760_08fb95ee5ebfae0d2886e61ea0dcab5a.pdf
دانشگاه تهران
بین المللی علوم (منتشر نمی شود)
1
0
2001
04
21
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-
30761
FA
T.
Nejadsattari
Journal Article
1970
01
01
Twelve aquatic sites in northwest and south of Tehran were sampled at monthly intervals form June through February 1996–1997 for members of Saprolegniaceae. In this study 12 genera and species were isolated.
Saprolegnia with five species and Achlya with two species were more common whereas, Isoachlya, Leptolegniella, Protoachlya and Pythiopsis all had low frequencies. Species of S.ferax was abundant in cool waters of winter and fall, whereas species of S.litolaris had highest frequency during summer months. Species of Achlya chlorata was more abundant during summer months. A.debaryana was isolated during summer and fall with almost the same frequency.
Occurrence of species of this family was comparable with occurrence of those in other temperate zones, although, there was some differences in comparison with findings of other workers.
https://iijs.ut.ac.ir/article_30761_be030a39c9f994bd1ac760fcc9c422ad.pdf
دانشگاه تهران
بین المللی علوم (منتشر نمی شود)
1
0
2001
04
21
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-
30762
FA
A.Pazirandeh
N.Sobhkhiz
Journal Article
1970
01
01
Gamma-ray and X-ray are powerful tools for analysis of internal material micro-structure. The technique is based on studying the leakage spectrum. Two basic phenomena are involved in this work, namely photo-electric effect and Compton scattering. We derived the fundamental equations to calculate four components contributed in building up the leakage spectrum, which are Compton-Compton, Rayleigh-Compton, Compton-Rayleigh and Rayleigh -Rayleigh scattering. Results of our calculation and measurements for aluminum target showed very good agreement.
https://iijs.ut.ac.ir/article_30762_ba5c838197fa3b5315230209485ba370.pdf