This study was performed to investigate the surface roughness of the Cerec Vita Mark II polished by various polishing techniques, compare with that of the Vintage enamel porcelain glazed by high temperature glazing technique. All of the Cerec specimen were finished with sequential use of high speed diamond burs(grit 45, 30 and $15{\mu}m$). The groups were divided into 5 groups : Group I : Cerec Vita Mark II block specimens polished with Sof-lex discs. Group II : Cerce Vita Mark II block specimens polished with Two Striper MPS. Group III : Cerce Vita Mark II block specimens polished with Enhance. Group IV : Cerce Vita Mark II block specimens polished with Porcelain laminate polishing FG kit. Group V : Vintage enamel porcelain glazed by high temperature glazing Technique. Each group was consisted of 10 specimens. The surfaces produced were examined quantitatively using a laser specular reflectance machine(Perthen RM600-s, Feinpruf Perthen GmbH., Germany) and qualitatively under SEM(JSM-5400, JEOL, Japan). The Results were as follows : 1. The arithmetic mean roughness value(Ra) in groups 1, 2, 3 and 4 was higher than that of group5. There was statistically significant difference(P<0.05). 2. The arithmetic mean roughness value(Ra) decreased in the following orders : group 1, group 2, group 4, group 3 and there was no statistically significant difference between group 1 and group 2, group 3, and group 4. There was statistically significant difference among group 1, 2, and group 3, 4 and group 5(P<0.05). 3. The maximum individual peak-to-valley-height(Rmax) decreased in the following orders : group 2, group 1, group 4, group 3, group 5 and there was no statistically significant difference between group 1 and 2, group 1 and group 4, group 3 and group 5. There was statistically significant difference among group 1, 2, and group 1, 4 and group 3, 5(P<0.05). 4. The treated surfaces of group 5 had smoother surface than that of groups 1, 2, 3, 4 with SEM.
Objectives : This research ws performed to investigate the effect of manual acupuncture at TE4, SP3 and TE4+SP3 on body weight, blood glucose, BUN, creatinine, lipid metabolism, liver function and morphological change of hepatic tissue in hyperglycemia rats. Methods : Experimenal groups were divided into hyperglycemia group(Control group), hyperglycemia and acupuncture therapy group at SP3, hyperglycemia and acupuncture therapy group at TE4, hyperglycemia and acupuncture therapy group at TE4+SP3 , once per 2 days during 5 weeks. Results : Body weight was decreased significantly in TE4 group of fifth week compared with Control group. Blood glucose was decreased significantly in SP3 group compared with control group. Creatinine was decreased significantly in TE4 and TE4+SP3 group compared with control group. Total cholesterol was decreased significantly in TE4+SP3 group compared with control group. Triglyceride was decreased significantly in TE4 gorup compared with control group. In the morphological change of hepatic cell, TE4 and SP3 group were showed he rough endoplasmic reticulum forms aggregates of parallel, flattened cisternae scattered randomly throughout the cytoplasm compared with control gruop. Conclusions : Acupuncture at TE4 can manage hyperglycemia by controlling body weight, and lipid metabolism in hyperglycemia rats induced by streptozotocin.
This study was performed to investigate the comparative effects of Apitoxin(0.1% bee venom 0.1cc) & Acupuncture therapy on the knee joint arthritis induced by 0.1% carrageenin solution at Rt. knee joint in rats. After carrageenin injection, the apitoxin was injected for two times (Experimental group I : 1 & 24hours later, Experimental group II : 48 & 72hours later) into the corresponding loci to Rt. $ST_{35}$(Group 3) & $EX-LE_4$(group 4) of the human body in rats. Acupuncture therapy was done same as above. And then the comparative effects of apitoxin and acupuncture therapy on the knee joint arthritis were estimated by the WBC count, RBC count, hemoglobin level, hematocrit level and ASO titer in serum. The results were summerized as follows : 1. The effects of apitoxin & acupuncture on WBC count showed remarkable decrease at group 3 & group 4 as compared with the control group in both experimental group I & experimental group II. There were not any statistical difference from apitoxin and acupuncture therapy by Duncan's multiple range test. 2. The effect of apitoxin on RBC count showed noticeable decrease at group 3 & group 4 as compared with the control group in both experimental group I & experimental group II. The acupuncture was not showed decrease at group 3 & group 4 as compared with the control group in both experimental group I & experimental group II. There were not any statistical difference from apitoxin and acupuncture therapy by Duncan's multiple range test. 3. The effects of apitoxin & acupuncture on hemoglobin level showed noticeable decrease at group 3 & group 4 as compared with the control group in both experimental group I & experimental group II. There were not any statistical difference from apitoxin and acupuncture therapy by Duncan's multiple range test. 4. The effect of apitoxin on hematocrit level showed noticeable decrease at group 3 & group 4 as compared with the control group in both experimental group I & experimental group II. The acupuncture was not showed decrease at group 3 & group 4 as compared with the control group in both experimental group I & experimental group II. There were not any statistical difference from apitoxin and acupuncture therapy by Duncan's multiple range test. 5. The effect of apitoxin on ASO titer showed noticeable decrease at group 3 & group 4 as compared with the control group only in experimental group I. The apitoxin & acupuncture showed decrease at group 3 & group 4 as compared with the control group in experimental group II. There were significantly statistical difference from apitoxin and acupuncture therapy by Duncan's multiple range test. The effect of apitoxin showed slightly decrease as compared with the acupuncture therapy by Duncan's multiple range test.
The study was carried out to determine the effects of long term dietary administration of vitamin A and ethanol on the changes of liver lipids in rats. Sixty rats were devided into 4 groups; $200{\mu}g$ vitamin A (group 1), $200{\mu}g$ vitamin A with ethanol (group 2), $2,000{\mu}g$ vitamin A (group 3), $2,000{\mu}g$ vitamin A with ethanol (group 4). Generally the contents of vitamin A in the liver were decreased in the group 4 as compared with the group 3. The contents of the liver vitamin A in the group 3 were increased linearly in accordance with duration of the vitamin A administration, however, the degree of accumulation of vitamin A in the group 4 showed lower than those in the group 3. The contents of total cholesterol in the liver of the group 3 were rather higher than those in the group 4. The contents of triglyceride in the liver of the group 3 were lower than those of the group 4. Histological pictures in the group 1 and 2 showed nonspecific during 3 times (8 weeks, 16 weeks, 24 weeks) experiment. Pictures of fatty liver were found after 8 weeks in the group 3 and the degree of fatty accumulation showed increased with time.
After 24 hours of preservation under 15 mmHg perfusion pressure the recovery rates of isolated canine hearts were determined. Preservation was performed in a cold room maintained at 4*C with 4 different types of perfusates bubbled with a mixture of 95% 0y and 5% CO~ using a modified perfusion unit designed in our institute. The perfusates used were as follows; Group 1: Krebs-Henseleit solution, Group 2: Krebs solution added by albumin and PGE1. Group 3: Modified Wicomb*s solution, Group 4: Modified Collin*s solution. The extent of myocardial recovery was evaluated using a modified isolated carmine perfusion model by measuring heart rate, systolic arterial pressure, left atrial pressure[LAP] and cardiac output. In addition to the above hemodynamic parameters, biochemical and enzymatic assays from perfusates and electron microscopic changes of the myocardium were also studied. The results were as follows; 1] The heart recovery rates were 41.6%, 53.4% and 108.9% in groups 1, 2 and 3, respectively, and group 3 elicited the best result[p< 0.001]. The heart beat was never recovered in group 4. 2] Recovered systolic arterial pressures[mmHg] were 63.3% in group 1, 94.9% in group 2 and 94.3% in group 3. 3] LAPs[mmHg] were 20 in group 1, 13.5 in group 2 and 11.2 in group 3, which suggested that the best myocardial preservation was elicited in group 3[p< 0.05]. 4] Cardiac output, the sum of aortic stroke volume and coronary leakage, were 69.1% in group 2, and 90.7% in group 3, but these were not statistically significant[p=0.24]. No aortic stroke output was measured in group 1 and 4. 5] The degree of myocardial edema increase was 17.5` in group 1, 24.6% in group 2, 20.9% in group 3 and 55.3% in group 4. But there were no statistical differences in each group[p= 0.08]. 6] CPK-MB[U/L] levels were increased 750% and 332%[p< 0.05], glucose levels[mg/dl] 60.5% and 78.2% and SGOT[U/L] levels 523% and 333%, in groups 2 and 3, respectively. Biochemical and enzymatic assays could not be performed in group 1 and group 4, because of poor recovery of heart beat. 7] Electron microscopic findings in the myocardium of most groups revealed slight to moderate muscle cell and mitochondrial edema. But all these findings were within the limits of reversible change. From these above results, it is suggested that modified Wicomb*s solution seems to be the most useful physiologic salt solution for preservation of the heart. We propose that after further study and improvement, our portable continuous hypothermic perfusion system will contribute to the development of a better preservation method for donor hearts for human heart transplantation.
Background: Ischemic preconditioning enhances the tolerance of myocardium against ischemia/reperfusion injury, with the enhancement of the recovery of post-ischemic myocardial function. This study was disigned to assess whether the protective effect of ischemic preconditioning could provide one additional hour of myocardial preservation in four hour myocardial ischemia in a rate heart. Material and method: Fourty four Spargue-Dawley rats, weighing 300~450gm, were divided into four groups. Group 1(n=7) and group 3(n=12) were subjected to 30 minutes of aerobic Langendorff perfusion without ischemic preconditioning and then preserved in saline solution at 2~4$^{\circ}C$ for 4 hours and 5 respectively. Group 2(n=7) and group 4(n=18) were perfused in the same way for 20 minutes, followed by 3 minutes of global mormothermic ischemia and 10 minutes of perfusion and then preserved in the same cold saline solution for 4 hours and 5 hours respectively. Heart rate, left ventricular developed pressure(LVDP), and coronary flow were measured at 15 minutes during perfusion as baseline. Spontaneous defibrillation time was measured after reperfusion. Heart rate, LVDP, and coronary flow were also recorded at 15 minutes, 30 minutes, and 45 minutes during reperfusion. Samples of the apical left ventricular wall were studied using a transmission electron microscope. Result: Time of spontaneous defibrillation(TSD) was significantly longer in group 4 than in group 1(p<0.001), and TSD in group 1 was significantly longer in comparision to that of group 2(p<0.05). Heart rate at 45 minutes was significantly higher in group 1 than in group 4(p<0.05). Heart rate at 15 min was significantly higher in group 2 than in group 1(p<0.001) and in group 4 than in group 3(p<0.05). Left ventricular developed pressure(LVDP) at 30 minutes and 45 minutes was higher in group 1 than in group 4(p<0.01), LVDP at 45 minutes was higher in group 4 than in group 3(p<0.05). Rate-pressure product(RPP) at 30 minutes and 45 minutes was higher in group 1 than in group 4(p<0.05). RPP at 15 minutes was higher in group 2 than in group 1(p<0.01). RPP at 30 minutes and 45 minutes was higher in group 4 than in group 3(p<0.05). Group 2 showed relatively less sarcoplasmic edema and less nuclear chromatin clearance than group 1. Group 4 showed less myocardial cell damage than group 3, group 4 showed less myocardial cell damage than group 3, group 4 showed more myocardial cell edema than group 1. Conclusion: Ischemic preconditioning enhanced the recovery of postischemic myocardial function after 4 hours and 5 hours preservation. However, it was not demonstrated that ischemic preconditioning could definitely provide one additional hour of myocardial preservation in four hour myocardial ischemia in a rat heart.
This study was performed to investigate the toxic effect of pyrrolizidine alkaloids from symphytum officinale i n rat. For this experiment, 120 male and female rats of Sprague-Dawley strain were used. The experimental groups were divided into five: Group CM and CF served as normal control with its gender. Group EM1 and EF1 were fed a 1% Symphytum officinal extract diet for 8 weeks. Group EM2 and EF2 fed a diet containing 2% extract diet. 4% extract diet into group EM3 and EF3 and 8% extract diet into group EM4 and EF4 were given. The results were as follows: 1. The major alkaloids of Symphytum officinale extract were symphytine, echmidine, and lasiocarpine. The amounts of total alkaloid were 168 $\mu\textrm{g}$ PAs/$m\ell$ extract. And contents of Pas in leaves were 0.05% wt.. 2. Total serum bilirubin concentrations increased significantly in group EM2, EM3, and EM4. Group EF1, EF2, EF3, and EF4 showed statistical significance for the group CF (p<0.05). 3. Aspartate transaminase activities were increased significantly in group EM3 and EM4 (p<0.05). Aspartate transaminase activities of EF1, EF2, EF3, and EF4 showed statistical significance for the group CF (p<0.05). 4. Alanine transaminase activities increased significantly in group EM3, EM4 (p<0.05). Alanine transaminase activities of EF1, EF2, EF3, and EF4 showed statistical significance for the group CF (p<0.05). 5. Alkaline phosphatase activities increased significantly in group EM2, EM3, and EM4 (p<0.05). Alkaline phosphatase activities of EF1, FE@, EF3, and EF4 showed statistical sigmificance for the group CF (p<0.05). 6. istopathological analysis of liver specimens from group EM3 and EM4 showed focal necrosis, periportal necrosis and apoptpsis. Hepatocytes obtained from group EM2 showed fatty change and hydropic degeneration in group EM3 and EM4. Chromatolysis and chromatin margination was shown in group EF2 and EF3. With the above results, it was demonstrated that the Symphytum officinal extract could induce functional change of liver, and histopathological change of liver in rats fed a diet containing extract. In conclusion, because of the risk of intoxication or adverse effect, the composition, dosage and mode of administration of herbal products should be monitored strictly. And this study serves as a reminder that herbal as well as orthodox medications may have serious side effects.
This study was performed to investigate the effect of aluminum compound on the aluminum contents and histological change in brain tissue of rats. Seventy five male Sprague-Dawley strains were divided into five groups consisting of the control, 250 ppm $AlCl_3$ group, 500 ppm $AlCl_3$ group, 250 ppm $Al_2(SO_4)_3$ group, 500 ppm $Al_2(SO_4)_3$ group and kept on the diet for 2 weeks. The weight gain was increased by administration of $AlCl_3$ but decreased by administration of $Al_2(SO_4)_3$ as compared to control group. The aluminum contents in brain tissue of each group; 250 ppm $AlCl_3$ group, 500 ppm $AlCl_3$ group, 250 ppm $Al_2(SO_4)_3$ group and 500 ppm $Al_2(SO_4)_3$ group were 64.63, 102.21, 132.64 and 180.41 ppm, respectively. Aluminum accumulation in brain tissue was higher with administration of $Al_2(SO_4)_3$ than with administration of $AlCl_3$. In $AlCl_3$ administration group, multiple small intracytoplasmic granules and microvacuole were seen in large pyramidal cells of cortex and granulovacuolar degeneration. In $Al_2(SO_4)_3$ administration group revealed pollagis pallor, cellular pyknosis, microcavitation resulted from edema in deeper cortical layers were observed. Blue-pigmentation which represents the accumulation of aluminum was noted In granulovacuolar degeneration site in $Al_2(SO_4)_3$ administration group.
This study was to determine the effect of DHEA administration before, during, and after dexamethasone treatment on body weight and TypeI,II muscle weight of rat receiving dexamethasone treatment. Method: Wistar rats were divided into 6 groups: control(C), dexamethasone(D), DHEA administration for 3days after dexamethasone treatment for 7days(7D+3DH), dexamethasone treatment for 7days after DHEA administration for 3days(3DH+7D), DHEA administration during dexamethasone treatment for 4days after dexamethasone treatment for 3days(3D+4DDH), DHEA administration during dexamethasone treatment for 7days(7DDH). Dexamethasone was injected by subcutaneously daily at a dose of 5mg/kg. DHEA was orally administered daily at a dose of 5mg/kg for 7 days. Soleus(TypeI) muscle, and both plantaris and gastro- cnemius(TypeII) muscles were dissected on the 7th day of experiment. Result: Body weight of both 3DH+7D group and 3D+4DDH group increased significantly compared with that of 7D group. Body weight of 7D+3DH group decreased significantly compared with that of 7D group, 7DDH group, 3DH+7D group and 3D+4DDH group. Muscle weight of both plantaris and gastro- cnemius tended to decrease compared with that of 7D group. Muscle weight of 7DDH group, 3D+4DDH group and 3DH+7D group increased significantly compared with that of 7D+3DH group. Muscle weight of gastrocnemius of both 3DH+7D group and 3D+4DDH group increased significantly compared with that of 7D group. Conclusion: Based on these results, it can be suggested that DHEA administration before and during dexamethasone treatment can increase both body weight and mass of atrophied TypeII muscle induced by dexa- methasone treatment.
In this work, the irreducible complex representations of degree 4 of $B_4$, the braid group on 4 strings, are classified. There are 4 families of representations: A two-parameter family of representations for which the image of $P_4$, the pure braid group on 4 strings, is abelian; two families of representations which are the composition of an irreducible representation of $B_3$, the braid group on 3 strings, with a certain special homomorphism $\pi : B_4 \longrightarrow B_3$; a family of representations which are the tensor product of 2 irreducible two-dimensional representations of $B_4$.
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