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APPROACH FROM PHYSICOCHEMICAL ASPECTS IN MEMBRANE FILTRATION
Iritani, Ei Ji,Mukai, Yasuhito 한국화학공학회 1997 Korean Journal of Chemical Engineering Vol.14 No.5
In membrane filtration, solution environment factors such as pH and solvent density are important in controlling the filtration rate and the rejection of the particles and/or the macromolecules. The filtration rate and the rejection in membrane filtration have been investigated from physicochemical aspects. It was shown that the properties of the filter cake formed on the membrane surface play a vital role in determining the filtration rate in membrane filtration. It was clearly demonstrated that such filtration behaviors as the filtration rate and the rejection are highly dependent on the electrical nature of the particles and/or the macromolecules. Furthermore, it was shown that the solvent density ρ has a large effect on the steady filtration rate in upward ultrafiltration.
Articles : Approach From Physicochemical Aspects in Membrane Filtration
( Eiji Iritani ),( Yasuhito Mukai ) 한국화학공학회 1997 Korean Journal of Chemical Engineering Vol.14 No.5
In membrane filtration, solution environment factors such as pH and solvent density are important in controlling the filtration rate and the rejection of the particles and/or the macromolecules. The filtration rate and the rejection in membrane filtration have been investigated from physicochemical aspects. It was shown that the properties of the filter cake formed on the membrane surface play a vital role in determining the filtration rate in membrane filtration. It was clearly demonstrated that such filtration behaviors as the filtration rate and the rejection are highly dependent on the electrical nature of the particles and/or the macromolecules. Furthermore, it was shown that the solvent density ρ has a large effect on the steady filtration rate in upward ultrafiltration.
Song, H.B.,Iritani, A. The Korean Society of Animal Reproduction 1985 Reproductive & developmental biology Vol.9 No.2
When goat spermatozoa were preincubated for 4-6 h and 6 h in the uteri isolated from hamster and rat, and for 6 h in the hamster uterus in situ, they developed the ability to penetrate zona-free hamster eggs in vitro. Zona-free hamster eggs were not penetrated after insemination with goat spermatozoa preincubated in the isolated hamster uterus 4 h before and 2 h after expected time of ovulation, respectively. Zona-free hamster eggs were not penetrated after insemination with goat spermatozoa preincubated for 4 h in the isolated hamster uterus, but 10 and 18% of eggs were penetrated by spermatozoa preincubated for 5 and 6 h in the isolated uterus.
Song, H.B.,Iritani, A. The Korean Society of Animal Reproduction 1985 Reproductive & developmental biology Vol.9 No.2
Ejaculated and epidiymal goat spermatozoa were preserved for 0, 6, 12 adn 18 h, and 0 and 18 h in a semi-aerobic condition at 20-$25^{\circ}C$, and preincubated for 5-6 h in a CO2 incubator in m-KRB solution. Then they were preincubated at different concentrations (3-5, 25-48 and 105-190$\times$107/ml), and ability of penetration into zona-free hamster eggs in vitro was examined. When ejaculated spermatozoa were preincubated in m-KRB solution after presservation for 12 and 18 h, 12 and 29% of zona-free eggs were penetrated, and only 4% of eggs were penetrated by epididymal spermatozoa which were preincubated after preservation for 18 h. When spermatozoa were preincubated at a low concentration, the penetration rates were very low. But when the sperm concentration during preincubation was 25-48 and 105-190$\times$107/ml, the penetration rates increased to about 30%.
송해범(H . B . Song),입곡명(A . Iritani) 한국축산학회 1987 한국축산학회지 Vol.29 No.7
A total of 471 follicular oocytes obtained from the immature goats treated with PMSG alone, with PMSG and hCG or without gonadotropins was used in this experiments to study the maturation of follicular oocytes in vitro and the effects of the presence of cumulus cells on their maturation. There was no difference in the proportion of oocytes at the germinal vesicle stage between oocytes having intact cumulus cells and those without cumulus cells, when they were fixed and examined immediately after collection. The oocytes with dispersed cumulus cells obtained from goats treated with PMSG and hCG were almost at the 2nd metaphase stage at the time of collection, and they could be used for in vitro fertilization immediately after collection. After cultivation for 25-35 h, the overall maturation rate to the 2nd metaphase was 62% and 57% in the oocytes with intact cumulus cells from goat treated with PMSG alone and without gonadotropins, and it was 67% in those from goats treated with PMSG and hCG after cultivation for 25-30 h. The results of this experiment suggest that the follicular oocytes with intact cumulus cells could be normally matured in vitro, while the oocytes without cumulus cells could not.