Showing papers by "Yonsei University published in 1978"

Correlation inequalities and the thermodynamic limit for classical and quantum continuous systems

Abstract: We use Ginibre's general formulation of Griffiths' inequalities to derive new correlation inequalities for two-component classical and quantum mechanical systems of distinguishable particles interacting via two body potentials of positive type. As a consequence we obtain existence of the thermodynamic limit of the thermodynamic and correlation functions in the grand canonical ensemble at arbitrary temperatures and chemical potentials. For a large class of systems we show that the limiting correlation functions are clustering. (In a subsequent article these results are extended to the correlation functions of two-component quantum mechanical gases with Bose-Einstein statistics). Finally, a general construction of the thermodynamic limit of the pressure for gases which are not H-stable, above collapse temperature, is presented.

[Epidemiological Study On Metagonimus Yokogawai Infection Along Boseong River In Jeonra Nam Do, Korea]

Abstract: Prevalence study of Metagonimus yokogawai infection, survey of intermediate hosts of Metagonimus yokogawai and food habits of raw sweetfish among inhabitants along Boseong river (120 km), Jeonra Nam Do (province) were carried out. The results are summarized as follows: 1. Among 360 examined, the egg positive case were 128(35.6%); male 112(46.7%), female 16(13.3%). 2. The prevalence rates were different by geographical areas; 42.4% in down stream, 49.4% in middle stream and 13.3% in upper stream. 3. By ages, highest rate, 53.6~59.1% was observed among 30~49 group (male 69.6~73.0%, female 15.8~35.5%). 4. Eggs per gram of feces were 2,084 (200~12,280) in average; down stream 1,708, middle stream 2,590, upper stream l,550. 5. By social strata, the prevalence showed differences; 24.8% in primary schoolchildren, 78.4% in school teacher and local officers, 30.6% in general inhabitants. 6. Clonorchis sinensis infected cases in the areas were 21(5.8%) out of 360 examined, and 90.5% of them showed mixed infection with Metagonimus yokogawai. 7. Cercariae of Metagonimus yokogawai from the lst intermediate host, Semisulcospira sp., in down and middle streams were detected from 32 snails (5.9%) out of 545 examined. 8. All the 22 Plecoglossus altivelis which were caught from the down stream were infected with metacercariae of Metagonimus yokogawai. The number of the metacercariae detected was 22,650 per fish in average, and the number increased from August to October. 9. Experiences of raw sweetfish intake of the inhabitants were found in 208(58.4%) among 356 interviewed by questionaire form (male 76.7%, female 20.7%). 10. Means of acquisition of the sweetfish were mostly by purchase 68.8%, and seasonally in summer. 11. Reason of the raw sweetfish intake was due to the flavor, 83.2%. The fish were mixed in soy sause with vinegar before the intake.

Diels-Alder reaction of pyrrole with dimethyl acetylenedicarboxylate

Abstract: Acetylendicarbonester (II) reagiert mit den Pyrrolen (I) zu den Addukten (III), die eine weitere Addition zu (IVa) und (IVb) geben.

Genetic load and viability variation in korean natural populations of Drosophila melanogaster.

Abstract: Natural populations of Drosophila melanogaster from Anyang and Susac (suburbs of Seoul) have been analyzed with respect to viability variation on the second chromosome. Homozygotes as well as random heterozygotes for wild chromosomes were studied. The frequency of lethal factors was about 16 per cent, that of drastics 26 per cent. The average viability of homozygotes was 0.650 including lethal lines and 0.858 for quasinormals; that for random heterozygotes was 1.125. Allelism tests have been performed for the lethals. The allelism rate turned out to be as high as 0.036 and 0.0214, respectively. Using a formula by Nei, the effective population size can be estimated from these data. Korean D. melanogaster populations proved as small as 2000 to 3000 individuals. No correlation between homozygous and heterozygous viabilities could be found. According to these observations, along with the fact that partly big clusters of identic lethals could be found in the allelism tests, it is concluded that in Korean populations quite a large part of the hard genetic load is balanced. The connection between population size, population structure and associative or genuine overdominance is discussed.

[Immunological Tests By Anti-Free-Living Amoebas Serum Produced In Experimental Animals: I. Immobilization Of Free-Living Amoebas In Vitro By Rabbit Antiserum]

Abstract: Rabbits were immunized with free-living amoebas by intravenous injections. The amoebas were Acanthamoeba culbertsoni and Naegleria fowleri and obtained by axenic cultivation in CGVS medium. Each rabbit received 10(6) of Acanthamoeba culbertsoni and 10(5) of Naegleria fowleri trophozoites respectively every other day in three doses and finally one booster dose at 1 week later. Antiserum was collected from thc following day of the booster injection up to 2 months period, and stored at -30 degrees C until use. The immobilization test was performed. One drop of amoeba suspension was mixed with the test serum on slide and observed the mobile state under microscope. 1. Maximal immobilizing phenomenon observed in 30 minutes and, then gradually recovered to normal state. 2. Inactivation of antiserum at 56 degrees C for 30 minutes did not affect the immobilization phenomenon. 3. The immobilization rates decreased by the serial dilution of antiserum. At dilution more than 1:8, the immobilization was almost the same as in the normal serum. 4. The immobilizing antibody in anti-Acanthamoeba culbertsoni rabbit serum showed highest titre in 3rd day after booster immunization and from first to 6th week in anti-Naegleria fowleri rabbit serum. 5. Cross matching of Acanthamoeba culbertsoni and Naegleria fowleri showed antigenic difference of the two species. It is suggested that the immobilization reaction may be of value as a supplementary test in the diagnosis of primary amoebic meningoencephalitis.

Postmortem Changes in Regulatory Proteins of Rabbit Muscle

Abstract: The procedures for complete extraction of regulatory proteins, particularly troponin and tropomyosin from the myofibrils of fresh and stored muscles were developed and the effect of postmortem storage of muscle on the properties of the regulatory proteins was studied. The ATPase enhancing ability and the sedimentation behavior of α-actinin from post-rigor muscle did not differ from those of α-actinin from pre-rigor muscle. The amounts of both troponin and tropomyosin decreased during the storage of muscle. Troponin decreased more rapidly than tropomyosin. These results were interpreted to support our hypothesis that the structural alteration of myofibril, which is mainly due to the change in the troponin-tropomyosin complex of thin filaments, proceeds during the postmortem storage of muscle.

Hypothesis of the fundamental length and quantum electrodynamics

Abstract: Under the hypothesis of a fundamental lengthl0, the Bopp equation is considered as a basic equation of motion instead of the Klein-Gordon equation. Assuming that the mass is a function of0, we derive a mass relationm≥(ħ/2l0c). The propagators obtained in the framework of the present theory have the same types as those with a simple cutoff. However, because of the mass relation, the tildon field with indefinite metric is always confined in the virtual state and never appears in real processes as a physical entity. Thus, our new version leads to a finite theory of quantum electrodynamics.

[Immunological Tests By Anti-Free-Living Amoebas Serum Produced In Experimental Animals: II. Indirect Fluorescent Antibody Titer Of Anti-free-living Amoebas Serum Produced In Rabbits]

Abstract: The indirect fluorescent antibody test was performed to demonstrate the antibody production in the rabbits immunized with free-living amoebas; Acanthamoeba culbertsoni and Naegleria fowleri, and antibody titer changes by immunization duration. Rabbits were immunized with Acanthamoeba culbertsoni and Naegleria fowleri which were cultured axenically in CGVS medium. For experiments, rabbits were divided into two groups; small dose group received 10(4) intravenously with live or dead free-living amoebas trophozoites as an immunizing dose three times with one week interval, and large dose group received 10(6) live or dead trophozoites respectively. The control group received physiologic saline or medium for culture of free-living amoebas intravenously. Antiserum was collected 4 times at interval of 3 days in the first 10 days, and also up to 2 months later. In the group immunized with live Acanthamoeba culbertsoni, fluorescent antibody titer was higher than in the group of dead one, and also in the large dose group than in the small dose group. Antibody titer of anti-Naegleria fowleri serum in the large dose group showed no difference by the source of amoeba antigen; live or dead. But in the small dose group, antibody titer was higher in the immunized with live Naegleria fowleri than in the group with dead one. No cross reactivity was demonstrated between the Acanthamoeba and Naegleria. And no cross reaction was observed when the free-living amoebas antigens were tested against human sera of amoebiasis, paragonimiasis and clonorchiasis.

Niclosamide In The Treatment Of Tetagonimiasis

Abstract: Anthelmintic effect of niclosamide [N-(2-chloro-4-nitrophenyl)-5-chloro-salicylamide)] on Metagonimus infection was carried out to the cases in area of Seomjin-river. The drug, one tablet contains 0.5 g of niclosamide was supplied from Bu-gwang pharmaceutical company in Seoul. Sixty five cases were divided into three groups by the regimen: Group l given 2 g(4 tablets) for one day, Group II for two successive days and Group III for three successive days. Stool examination was done before and 2-3 weeks after the drug administration by formalin-ether concentration and Stoll's dilution egg counting techniques. The results were as follows: Egg negative conversion (cured) and egg reduction (more than 80% decrease) rates were 28.6%, 10.7% in group I, and 31.8%, 27.3% in group II. But of those in group III treated for three successive days, 73.3% was cured and 26.7% showed egg reduction, and the general egg reduction rate was 95.1%. The results in the present trial suggested that the niclosamide has anthelmintic efficacy when it is used in 2g for more than three successive days.