The Establishment of Thermal Conductivity Model for Linear Low-Density Polyethylene/Alumina Composites Considering the Interface Thermal Resistance.

An optimized thermal conductivity model of spherical particle-filled polymer composites considering the influence of interface layer was established based on the classic series and parallel models. ANSYS software was used to simulate the thermal transfer process. Meanwhile, linear low-density polyethylene/alumina (LLDPE/Al2O3) composites with different volume fractions and Al2O3 particle sizes were prepared with the continuous mixer, and the effects of Al2O3 particle size and volume fraction on the thermal conductivity of the composites were discussed. Finally, the test result of the thermal conductivity was analyzed and compared with ANSYS simulations and the model prediction. The results proved that the thermal conductivity model considering the influence of the interface layer could predict the thermal conductivity of LLDPE/Al2O3 composites more precisely.

[Effect of Jiangtang Xiaozhi Tablet on Insulin Resistance KK-AY Transgenic Mice Model of Diabetes Mellitus].

Objective To observe effects of Jiangtang Xiaozhi Tablet (JTXZT) on homeostasis model of assessment for insulin resistance index (HOMA-IR) , insulin sensitivity index ( ISI) , expres- sions of insulin (INS) and insulin receptor (InsR) in pancreas tissues of KK-A(y) transgenic mice model of diabetes mellitus (DM). Methods KK-A(y) transgenic mice were fed with high fat forage to induce hyper- glycemic obese DM model. The C,7ice at same age were used as a normal control group (fed with e- qual volume of sterile water, n =11). Successful modeled 55 mice with DM obesity were divided into 5 groups by random digit table (11 in each group) , including the model group (fed with equal volume of ster- ile water, with no treatment) , the Pioglitazone Hydrochloride Tablet treatment group (8 mg/kg; as a posi- tive control group) , and JTXZT groups [high (10. 0 g crude drugs/kg) , middle (5. 0 g crude drugs/kg) and low dose (2. 5 g crude drugs/kg) ]. All medications were fed by gastrogavage, once per day for 8 succes- sive weeks. All mice were weighed and levels of random blood glucose (RBG) determined after 8 weeks of treatment. Blood was collected from ophthalmic vein. Levels of insulin (INS) , serum total cholesterol (TC) and triglyceride (TG) were detected. HOMA-IR and ISI were calculated. The morphological changes of pancreas tissues were extracted for performed pathological examinations. The expressions of INS and insulin receptor (InsR ) were measured by immunohistochemistry ( IHC ). Expressions of insulin receptorp ßInsRP) and insulin receptor substrate-1 (IRS-1) in pancreas tissues were detected using Western blot. Results Compared with the normal control group, obesity, obviously increased blood glu- cose and blood lipids occurred in each group after modeling (P <0. 01). After 8 weeks of medication mice in the model group had put up body weight (P <0. 01) , blood glucose and blood lipids were kept on quite higher levels. Compared with the model group, body weight, serum levels of TG, INS, and HOMA-IR obvi- ously decreased in each JTXZT group (P <0. 05, P <0. 01). Besides, RBG decreased obviously lower in the high dose JTXZT group (P <0. 01). ISI obviously increased in low and high dose JTXZT groups (P < 0. 05, P <0. 01). Pathological results of HE staining in pancreas showed that atrophied islets with obvious- ly reduced numbers in the model group. They were sparsely distributed with reduced islet density.-Islet cells were compensatively hypertrophy, with degenerated vacuoles. Apoptosis of islet cells could also be seen in the model group, manifested as swollen cytoplasm and paryopyknosis. Islet number was obvious- ly increased in high and middle dose JTXZT groups, with reduced apoptosis and degenerated cells. Re- sults of IHC assay showed, as compared with the normal control group, the grey values of INS and InsR were significantly decreased in the model group (P <0. 01). Compared with the model group, IOD values of INS and InsR (IOD) were significantly increased in each JTXZT group (P <0. 05, P <0. 01). Results from Western blot showed that protein expressions of InsRP ßnd IRS-1 were obviously decreased in the model group, as compared with the normal control group (P <0. 01). Compared with the model group, protein expressions of InsRP ßnd IRS-1 were obviously increased in each JTXZT group (P <0. 01) , but with no statistical difference as compared with the Pioglitazone Hydrochloride Tablet treatment group (P > 0. 05). Conclusions JTXZT had obvious roles in decreasing levels of blood glucose, serum lipids, and improving insulin resistance in KK-Ayt(r) ansgenic mice model with diabetic obesity. Its mechanism might involve in increasing expressions of lnsRp and IRS-1 in pancreas cells, promoting the integration of INS to its receptors, and thereby improving glucose metabolism , lipid metabolism , and IR state.

[Analysing on compatibility principle of pharmacologic action of traditional Chinese medicine formula by network approach].

OBJECTIVE: To provide a new approach for studying the compatibility principle of traditional Chinese medicine formula (TCMF) by constructing compatibility network of phamarcologic action of TCMF according to the network theory. METHOD: With Chinese herb as node and compatibility relationship of herb-herb as edge according to network theory, compatibility network of phamarcologic action of TCMF was constructed after the compatibility relationship of herb-herb was analysed by two-way analysis of variance (ANOVA)through phamarcology experiment. Then compatibility principle of TCMF was analysed with network efficiency (NE) and NE related parameters. RESULT: The network approach was applied for studying compatibility principle of Jiawei Shengmai San on it's antimyocardial ischemia reperfusion injury action. The results indicated that rhizoma corydalis was the main herb in Jiawei Shengmai San, and in turn was radix ophiopogonois, radix salvia miltiorrhiza, radix ginseng and fructus schizandrae, radix ginseng and radix salvia was clustered first, and in turn was radix, Formule composed of ophiopogonois and fructus schizandrae. Formule composed of radix ginseng and radix salvia, and radix ophiopogonois and fructus schizandrae; radix ginseng, radix salvia miltiorrhiza and rhizoma corydalis was the most effective one among all the formulaes. These results were consistent with validation experiments. CONCLUSION: Studying compatibility principle of TCMF by network theory is a new and feasible method.

[Construction of recombinant fowlpox virus expressing E0 gene of classical swine fever virus shimen strain and the animal immunity experiment].

The CSFV E0 gene was amplified from the plasmid pMD18-T-E0 by PCR and cloned into the FPV-P11 and FPV-pSY. The identified recombinant DNA was transfected into chicken embryo fibroblasts (CEF) to package Fowlpox virus. E0 gene was confirmed to be integrated into the genome of recombinant Fowlpox virus by PCR, and Western blot was employed for detection of E0 expression in the chicken embryo fibroblasts infected with recombinant Fowlpox virus . The results of ELISA showed that systemic immune response to CSFV could be induced effectively after the mice were immunized three times with recombinant Fowlpox virus through celiac route, the titer of antibody was 1 : 4096. The protection experiment showed that 75% of piglets immunized three times with recombinant Fowlpox virus were survived, indicating that the recombinant Fowlpox virus was effective. This paper lays foundation for the study of CSFV live vector vaccine.

Cardio-protective effects of Corocalm on acute myocardial ischemia/reperfusion injury in rats.

OBJECTIVE: To investigate the cardio-protective effects of Corocalm on acute myocardial ischemia in rats, and to explore its possible therapeutic mechanisms. METHODS: The acute ischemic model was prepared by ligating the left anterior descending (LAD) coronary artery in rats. The animals were divided into 6 groups, 8 in each group. The sham operated group underwent heart exposure without ligation and were treated with normal saline 3 ml/kg, while the other 5 groups, the model groups, consisted of acceptable acute ischemic model rats and were also treated with normal saline, with the Guanxin Capsule (GXC) group treated with refined GXC, 600 mg/kg, the low and high dose Corocalm groups treated with 85 mg/kg and 340 mg/kg of Corocalm respectively, and the Diltiazem group, treated with Diltiazem 5 mg/kg, with all the tested drugs prepared with normal saline into equal volume (3 ml/kg) and administrated once via duodenum 10 min before ligation. Myocardial infarction area was determined by the quantitative histological assay with nitroblue tetrazolium (N-BT) stain. And the levels of creatine phosphokinase (CK), lactate dehydrogenase (LDH), malondialdehyde (MDA) content, and the activity of superoxide dismutase (SOD) in serum were measured by biochemical assay and spectrophotometry respectively. Besides, the blood viscosity in another 50 rats was determined, who received for 7 successive days oral administration with different concentration of Corocalm or aspirin. RESULTS: It showed that low and high dose Corocalm could significantly reduce the infarction area, inhibit the increase of serum CK, LDH activity and MDA content, and enhance the SOD activity after ischemia/reperfusion. The whole blood viscosity at different shear rates in rats treated with high dose Corocalm was significantly lower than those treated with normal saline (P < 0.05). CONCLUSION: Corocalm has favourable protective effects on heart in ischemic condition, the effect of which might be through its actions in inhibiting CK and LDH activity, scavenging oxygen free radicals, and lowering blood viscosity.

[The effect of Hongjingtian (Gadol) injection on cardiac hemodynamics and myocardial oxygen consumption of dogs].

OBJECTIVE: To study the effect of Hongjingtian (Gadol) injection on cardiac hemodynamics and myocardial oxygen consumption for analyzing its underlying mechanism in the treatment of coronary heart disease. METHOD: A total of 20 dogs anesthetized with pentobarbital sodium (30 mg x kg(-1), i.v.) were evenly randomized into control group, low-dose Gadol (LDG) group, high-dose Gadol (HDG) group and Herbesser Injection group. The blood flow volume (BFV) of the left coronary artery and cardiac output (CO), left ventricular pressure (LVP), maximum ascending rate (dp/dtmax) of LVP, mean arterial pressure (MAP) of the femoral artery, oxygen contents of the coronary artery and coronary vein (venous sinus), oxygen consumption index (OCI), cardiac index (CI), coronary artery resistance (CAR) and total peripheral resistance (TPR) as well as oxygen utilization rate (OUR) were detected respectively. RESULT: After venous injection of Gadol, CAR, MAP, TPR, OCI, myocardial oxygen consumption and heart rate lowered significantly (P < 0.05-0.01), while BFV and blood oxygen content of the venous sinus increased considerably (P < 0.05-0.01) in comparison with pre-injection. No significant differences were found in LVP and myocardial contractivity between control group and LDG, and between control and HDG groups respectively. CONCLUSION: It showed dilation of the coronary artery and reduction of the cardiac afterload after injection of Gadol. Besides, CO and stroke volume increased considerably and the cardiac effective work was raised without any significant simultaneous increase of both myocardial contractility and LVP. A decrease in the myocardial oxygen consumption and reduction of OCI indicates an improvement of the oxygen supply of the myocardium, and a favorable regulation of the compliance of the cardiac vessels. As a result, the cardiovascular performance was ameliorated. The abovementioned improvement of these indexes may contribute to the therapeutic effect of Gadol in the treatment of coronary heart disease in clinic.

[Effects of shuangshen tongguan (SSTG) on TNF-alpha, ICAM-1 during myocardial ischemia-reperfusion injury].

OBJECTIVE: To observe the effects of SSTG on infarction size and tumor necrosis factor-alpha (TNF-alpha), intercellular adhesion molecular-1 (ICAM-1) levels in serum during reperfusion injury of acute myocardial ischemia. METHOD: Anterior descending branch of coronary artery was ligated and released to create myocardial ischemia-reperfusion injury. The size and weight of infarction area and the contents of TNF-alpha, IGAM-1 in serum were assayed by N-BT staining and ELISA respectively. RESULT: The size and weight of infarct area and the contents of TNF-alpha, ICAM-1 in serum were significantly increased compared with the normal group and were obviously decreased after being treated with SSIG. CONCLUSION: Ischemia-reperfusion stimulated the secretion of TNF-alpha and ICAM-1, which play an important role in ischemia-reperfusion injury. SSTG might protect myocardium from ischemia-reperfusion injury by suppressing over-secretion of TNF-alpha and ICAM-1 and reducing the size and weight of infarction area.