The main role of water treatment plants is to supply high-quality safe drinking water. Coagulation is one of the most important stages of surface water treatment. The photometric dispersion analyzer(PDA) is a new opti...The main role of water treatment plants is to supply high-quality safe drinking water. Coagulation is one of the most important stages of surface water treatment. The photometric dispersion analyzer(PDA) is a new optical method for flocculation monitoring, and is feasible to realize coagulation feedback control. The on line modification of the coagulation control system' s set point( or optimum dosing coagulant) has influenced the application of this technology in water treatment plant for a long time. A fuzzy control system incorporating the photometric dispersion analyzer was utilized in this coagulation control system. Proposed is a fuzzy logic inference control system by using Takagi and Sugeno' s fuzzy if-then rule for the self-correction of set point on line. Programmed is the dosing rate fuzzy control system in SIEMENS small-scale programmable logic controller. A 400 L/min middle-scale water treatment plant was utilized to simulate the reaction. With the changes of raw water quality, the set point was modified correctly in time, as well as coagulant dosing rate, and residual turbility before filtration was eligible and stable. Results show that this fuzzy inference and control system performs well on the coagulation control system through PDA.展开更多
In the present work, the classical Bethe–Weizs?cker(BW) mass formula with five energy terms is revisited and updated. We use the least-squares adjustments on the binding energy of 2497 different nuclides from the las...In the present work, the classical Bethe–Weizs?cker(BW) mass formula with five energy terms is revisited and updated. We use the least-squares adjustments on the binding energy of 2497 different nuclides from the last update of the atomic mass evaluation,AME2016 published in March 2017, to provide a new set of energy coefficients of the mass formula. The obtained set of formula coefficients allowed us to reproduce most of the experimental values of the binding energies for each nucleus with A ≥50. The comparison between the binding energies provided with updated mass formula and those of AME2016 on the one hand, and those of previous works,on the other hand, yields relative errors that oscillate between less than 0.05% and 1.5%. The revisited BW formula is in very good agreement with the experimental data.展开更多
The early responses of pig skin to fractionated doses of fast neutrons (35 Mev P→B) were determined. A neutron fractionation scheme comprised of 12 fractions in 42 days. The lowest doses of Ⅰ, Ⅱ, Ⅲ degree erythema...The early responses of pig skin to fractionated doses of fast neutrons (35 Mev P→B) were determined. A neutron fractionation scheme comprised of 12 fractions in 42 days. The lowest doses of Ⅰ, Ⅱ, Ⅲ degree erythema of pig skin by Irradiation were 16. 38, 17. 32 and 19. 78 Gy respectively. The ED50 Values for moist desquamation was 23. 40 Gy. The mean latency of early pig skin damage was prolonged with the decreasing of total dose. The degree and the incidence of early pig skin damage were associated with total dose.These results for fast neutron therapy facility can be extrapolated to the human situation with a high degree of confidence, so that the neutron dose which would yield acceptable skin damage in patients may be determined using the data presented here.展开更多
Between October 1985 and June 1992 Postoperative kelolds of 125 Patients were treated with superficial X-ray (100-140 Kv) and electron beam (6 and 9 MeV ), in an attempt to prevent their recurrence, 100 patients with ...Between October 1985 and June 1992 Postoperative kelolds of 125 Patients were treated with superficial X-ray (100-140 Kv) and electron beam (6 and 9 MeV ), in an attempt to prevent their recurrence, 100 patients with 129 sites received a dose of 1200-4000 cGy at 200-300 cGy per fraction within one to four weeks and at intervals of one to three weeks between excision and irradiation. Rate of success In the prevention of kelold was only 28. 6% (37/ 129). However, 25 patients with 25 sites received a total dose of 1500 cGy at 500 cGy per fraction starting within one week after excision and at Intervals of 96 hours. The success rate was 84% (21/25).展开更多
The dewaterability of activated sludge conditioned by chitosan flocculant was studied. The effects of chitosan characteristics such as molecular weight, degree of deacetylation, and dose on the dewaterability were inv...The dewaterability of activated sludge conditioned by chitosan flocculant was studied. The effects of chitosan characteristics such as molecular weight, degree of deacetylation, and dose on the dewaterability were investigated. The sludge dewaterability is evaluated in terms of specific resistance to filtration, residual turbidity of supernatant, moisture content of cake, and settling rate. Sludge dehydrating behaviors conditioned with CTS, PAM and PAC flocculants were compared. The conditioning was also carried out with dual flocculants in two stages. It is found that the sludge conditioned with CTS has better dewaterability than that with PAC. The optimum conditions with chitosan are: dose 0.8 - 1.2 g per 100 g dry cake, molecular weight 300,000, and degree of deacetylation 70%. The conditioning in two stages with dual flocculants is found to be more effective than that with single flocculant.展开更多
To investigate the radioimmunotherapeutic efficacy, radio-immunoconjugate 131-I-3G9, 811-I-3H11 and 131-I-NMIgG (irre levant antibody) were i.p. injected into nude mice bearing human gastric cancer xenograftes. Each a...To investigate the radioimmunotherapeutic efficacy, radio-immunoconjugate 131-I-3G9, 811-I-3H11 and 131-I-NMIgG (irre levant antibody) were i.p. injected into nude mice bearing human gastric cancer xenograftes. Each animal received a single doses of 555MBq. Over 14 days the accumulative absorbed doses in tumors were 13.7 Gy for 131-I-3H11 and 12.17 Gy for 131-I-3G9. Both were significantly higher than that for 131-I-NMIgG (3.23 Gy). Thera peutic efficacy appeared most sharply from 2 to 3 weeks after injection. The inhibition ratio of tumor were 86% and 70% for 131-I-3H11 and 131-I-3G9 respectively. Histopathological evidance indicated that in tumor tissues radioactive damage was showed as karyopyknosis, karyorrhexis and necrosis or partial disappearance of tumor cells, while in the other tissues no radioactive damage was observed. WBC counts of all animals did not show significant difference before and after treatment, which indicated that the haemopoietic function of bone marrow was not affected.展开更多
A new polysaccharide compound (ACPS-R) has recently been isolated from the root of Actinidia Chinensis Planch. When given inttaperitoneally to the transplantable tumor bearing mice at dose of 75-125 mg/kg, the tumor i...A new polysaccharide compound (ACPS-R) has recently been isolated from the root of Actinidia Chinensis Planch. When given inttaperitoneally to the transplantable tumor bearing mice at dose of 75-125 mg/kg, the tumor inhibition rate was more than 88.8% in Ehrilich ascitic cancer (EAC) or ascitic from of hepatoma (HepA) and more than 49.6% in solid hepatoma (HepS). The treatment effect of ACPS-R on EAC at dose of 80-100 mg kg and 125 mg/kg were comparable to that of cyclophosphamide at dose of 15 mg/kg and 22.5 mg/kg, respectively. ACPS-R could also prolong the life of EAC- or P388-bearing mice, and increase the percentage of EAC-free mice. In addition, when ACPS-R was used in combination with 5-Fu, the antitumor effect was enhanced as compared with 5-Fu alone. A marked increase in cAMP levels end cAMP cGMP ratio of spleen of EAC-bearing mice were observed after treatment of ACPS-R. The increase of both para meters nearly reached the normal levels of healthy mice. The increases of cAMP, cAMP cGMP and tumor remission had statistical significance. It showed an intermediate inhibitory effect of ACPS-R on DNA synthesis by incorporating 3H-TdR into EAC cells.The results indicated that ACPS-R acts as a new antitumor polysaccharide, and the treatment effect of Actinidia root in folk medicine is probably related to ACPS-R.展开更多
Harringtonine(H) level in serum was quantified by high-performance liquid chromatographic (HPLC) technique and its pharmacokinetic parameters were determined in 11 patients with ANLL after 4 hours continuous infusion ...Harringtonine(H) level in serum was quantified by high-performance liquid chromatographic (HPLC) technique and its pharmacokinetic parameters were determined in 11 patients with ANLL after 4 hours continuous infusion of 4 mg of H. 74 serum samples over the range of H administered 1-6 mg/d were also determined, the dose of H administered paralleled the mean serum H concentration, but the highest concentration were 1.6-7 folds higher than the lowest under the same doses. It seems that the dosage of harringtonine must be individualized in order to achieve better antileukemia effect. It was found that under the similar serum H concentration the marrow blast decrease index (MBDI) in types M4 and M5 of ANLL is much more greater than in M2 after the first course of chemotherapy and in 3 patients of M2, the serum H level and the MBDI show positive correlation.展开更多
From July 1969 to November 1991, 4 patients with primary malignant lymphoma of the larynx were treated.One case was received radiotherapy and followed- up survey for 20 years being healthy, 3 case were received radiot...From July 1969 to November 1991, 4 patients with primary malignant lymphoma of the larynx were treated.One case was received radiotherapy and followed- up survey for 20 years being healthy, 3 case were received radiotherapy and chemotherapy. A total dose of 45-60 Gy was delivered. The disease can be classified four clinical types, (1) localized laryngeal lymphoma; (2) cephalocevical and larynx lymphoma; (3) laryngeal pieces region lymphoma; and (4) laryngeal pieces wildly spreaded lymphoma. The favorable prognostic factors were clinical course, clinical staging and the mode of treatment.展开更多
Fifteen patients with unresectable hepatocellular carcinoma were treated with unresectable hepatocellular carcinoma were treated with high dose MMC or ADR via hepatic artery with drug filtration in our hospital from A...Fifteen patients with unresectable hepatocellular carcinoma were treated with unresectable hepatocellular carcinoma were treated with high dose MMC or ADR via hepatic artery with drug filtration in our hospital from April to December 1988. Among them, 11 cases (73%) had symptoms relief, 3 cases (20%) tumor minimal remission and AFP decreased in 4 cases (33%). One case dide of hep'atoma 8 months after HAI-F and another case was followed up only 2 months after treatment, the remaining 13 cases are alive for 5 to 10 months after HAI-F. The reasons of unsatisfactory results were analyzed and possible ways of improvement were suggested.展开更多
From Dec. 1976 through June 1986, 474 patients with acute leukemia were treated with central nervous system (CNS) irradiation for the purpose of preventing relapse of CNS leukemia. Of the whole series, whole cranial i...From Dec. 1976 through June 1986, 474 patients with acute leukemia were treated with central nervous system (CNS) irradiation for the purpose of preventing relapse of CNS leukemia. Of the whole series, whole cranial irradiation at a dosage of 24 Gy and 4-5 intrathecal instillations of methotrexate (MTX) were given in 149 patients, simple intrathecal instillation of MTX in 44 patients and high dose intravenous MTX in 5 patients; the CNS relapse rates were 4.0%, 20.5% and 40.0% respectively. It was proved by our experience that whole cranial irradiation plus intrathecal MTX is the best approach to prevention of CNS leukemia relapses.展开更多
Using cytotoxicity and thymidine uptake assays, we investigated the effects of human recombinant in-terleukin-2 (rIL-2) on the induction of lympholine-activated killer (LAK) activity and cellular proliferation in sple...Using cytotoxicity and thymidine uptake assays, we investigated the effects of human recombinant in-terleukin-2 (rIL-2) on the induction of lympholine-activated killer (LAK) activity and cellular proliferation in splenocytes and thymocytes from human fetuses (18-22 weeks). We observed that fetal splenocytes and thymocytes incubated with low doses of rIL-2 (10-100 U ml) developed broad antitumor activity (LAK activity) although the kinetics and magnitudes of the responses were different. It indicated the LAK precursors are present in fetal spleen and thymus. Further, rIL-2 induced a strong proliferative response in splenocytes, but not in thymocytes. On the basis of the findings, we conclude that the responses of fetal splenocytes and thymocytes to IL-2 are different.展开更多
Generally, TGF-βs are held to down- regulate the growth of immune cells and to inhibit the development of certain differentiated functions, such as the induction of LAK activity by IL-2. In the present study, the eff...Generally, TGF-βs are held to down- regulate the growth of immune cells and to inhibit the development of certain differentiated functions, such as the induction of LAK activity by IL-2. In the present study, the effects of TGF-β1 on the proliferation and cytotoxicity of human PBMC activated by anti-CD3 or and-CD3 plus anti-CD28 was investigated. The results demonstrated that TGF- β1 clearly inhibits the induction of cytotoxic ability in human PBMC stimulated via CD3 or CD3 and CD28 ( P<0. 01) , without significantly altering the proliferative response to these stimuli, at the tested doses of TGF-β1. Co-stimulation with IL-2 was hardly altered, suggesting that TGF-β1 action is affected by the nature of the costimulatory signals.展开更多
Objective: To investigate the effect of Malytea Scurfpea fruit (MSF) on adhesion and migration of melanocyte. Methods: Human epidermal melanocytes were treated with MSF and examined for its adhesion to bovine serum fi...Objective: To investigate the effect of Malytea Scurfpea fruit (MSF) on adhesion and migration of melanocyte. Methods: Human epidermal melanocytes were treated with MSF and examined for its adhesion to bovine serum fibronectin-coated culture plate and for its migration into micropore filters, which were then compared with those of untreated control. Results: Compared with the control, MSF treated melanocytes were easier to adhere to the dishes and move into the filters in a dose-dependent manner, but when the dose of MSF was higher than 150 μg/ml, the adhesion and migration could not be significantly increased. And it was noticed that when the concentrations of MSF was 10μg/ml, significant statistical difference did show between the migration of the treated and untreated melanocytes ( P<0.05) though the adhesion was not increased significantly. Conclusion: MSF had the ability to affect melanocyte adhesion and migration. This could explain, in part, the mechanism of MSF in curing vitiligo lesions.展开更多
Objective: To explore the molecular regulation mechanism of carvedilol in attenuating the reversion back towards fetal energy metabolism during the development of cardiac hypertrophy induced by coarctation of abdomina...Objective: To explore the molecular regulation mechanism of carvedilol in attenuating the reversion back towards fetal energy metabolism during the development of cardiac hypertrophy induced by coarctation of abdominal aorta (CAA) in male Wistar rats. Methods: Hemodynamic and ventricular remodeling parameters, free fatty acid content in the serum were measured in the experimental animals at 16 weeks after the surgical CAA, the rats receiving carvedilol intervention (CAR) after CAA, and those with sham operation (SH). The expressions of muscle carnitine palmitoyltransferaseⅠ (M-CPTⅠ) and medium chain acyl-CoA dehydrogenase (MCAD) mRNA in the cardiac myocytes from every group were studied with RT-PCR. Results: Significant left ventricular hypertrophy were observed in the rats 16 weeks after coarctation operation (P<0.05), together with significant free fatty acids accumulation and downregulation of M-CPTⅠ and MCAD mRNA (P<0.05) in CAA group. Carvedilol at a dose of 30 mg/kg/d for 12 weeks inhibited the left ventricular hypertrophy induced by pressure overload and enhanced the gene expressions of rate-limiting enzyme (M-CPTⅠ) and key enzyme of fatty acid (MCAD) in the CAR group compared with CAA group (P<0.05). Conclusion: Pressure overload-induced hypertrophy in CAA rats causes the reversion back towards fetal enery metabolism, that is, downregulates the expressions of rate-limiting enzyme and key enzyme of fatty acid oxidation. The intervention therapy with carvedilol, a vasodilating alpha- and beta-adrenoreceptor antagonist, attenuates the reversion of the metabolic gene expression to fetal type through upregulating M-CPTⅠ and MCAD mRNA expressions. Thus, carvedilol may exert cardioprotective effects on heart failure by the mechanism of preserving the adult metabolic gene regulation.展开更多
The specimens were from 110 patients with primary hepatic carcinoma. The formalin- fixed and paraffin-embedded sections were stained for HBxAg by ABC method and for HBsAg and HBcAg by PAP method. Of the 110 cases, 64 ...The specimens were from 110 patients with primary hepatic carcinoma. The formalin- fixed and paraffin-embedded sections were stained for HBxAg by ABC method and for HBsAg and HBcAg by PAP method. Of the 110 cases, 64 (58. 2%) showed HBxAg-positive reaction in tumor tissue, and 63 (78. 8%) of 80 cases displayed positive HBxAg in surrounding non-cancerous hepatic tissue. Among the 64 cases with positive HBxAg in tumor tissue, 15 (23. 4%) were associated with HBsAg and/or HBcAg, while in the 63 cases with positive HBxAg in non-tumor tissue, 45(71. 4%) were accompanied with HBsAg and/or HBcAg. These findings suggest a dose relationship between prlmay hepatic carcinoma and HBV infection. The high detection rate of HBxAg Indicates a very active expression of the Integrated HBV- DNA genome in the host cells. However, the action of HBxAg in pathogenesis of hepatocellular carcinoma remains to be further investigated.展开更多
Four cases of primary plasma cell leukemia (PPCL) admitted to Zhongshan Hospital from 1959 to 1987 are reported with a review on additional 40 cases reported in China. Comparing with the 57 cases of multiple myeloma (...Four cases of primary plasma cell leukemia (PPCL) admitted to Zhongshan Hospital from 1959 to 1987 are reported with a review on additional 40 cases reported in China. Comparing with the 57 cases of multiple myeloma (MM) treated in our hospital, the following features were observed in PPCL: (1) The age was younger, with a mean of 45.2 years, 34.1% of the patients were under 40 years. (2) Onset was abrupt. Duration from onset to diagnosis was 2 months or less in 77% patients but never beyond 6 months. (3) 81.8% patients had liver enlargement, 59.1% splenomegaly and 61.4% sternum tenderness. (4) All patients showed marked anemia with an average hemoglobin of 65 g/L. BPC count was less than 100 × 109/L in 76% patients and WBC was more than 10×109/L in 77%. (5) Plasma cell number in the marrow was markedly increased with an average of 69%, of which the blast cells and immature forms were predominant. (6) No destruction of bones was shown on X-ray film in 68.3% patients. (7) The response to chemotherapy was poor with a total response rate of 18% and a mean survival of 2 months. All the above-mentioned clinical features were significantly different from those of MM. In addition, these two diseases were also different in cytology, cytogenetics and ultrastructure. Therefore, PPCL should be considered as a special type of acute leukemia distinct from MM. High dose of alkylating agents in combination with autologous bone marrow transplantation might improve the prognoses.展开更多
Objective: To investigate changes of Ca2+ activated potassium channels (KCa) in autogenous vein grafts. Methods: Contraction of venous ring was measured by means of perfusion in vitro. The intimal rabbits proliferatio...Objective: To investigate changes of Ca2+ activated potassium channels (KCa) in autogenous vein grafts. Methods: Contraction of venous ring was measured by means of perfusion in vitro. The intimal rabbits proliferation of vascular and proliferation of cultured smooth muscle cells(vascular smooth muscle cells, VSMCs)were observed by the means of computerised image analysis and MTT method respectively. Furthermore, whole cell mode of patch clamp was used to record KCa of VSMCs isolated from autogenous vein grafts. Results: One week after transplantation there were no significant differences of contraction and intimal relative thickness between autogenous vein grafts and control. Contraction and intimal relative thickness of autogenous vein graft were significantly increased 2 weeks after transplantation (P<0.05, n=8 vs control), and they was more enhanced 4 weeks after vein transplantation (P<0.01, n=8 vs control).TEA(blocker of Ca2+ activated potassium channels)increased MTT A490 nm value of VSMCs from femoral vein in a dose dependent manner(P<0.05, n=8). KCa current density was significantly attenuated in VSMCs from autogenous vein grafts (1-4) week after transplantation(P<0.05, n=5).Conclusion: KCa is inhibited in autogenous vein graft, which account for vasospasm and intimal proliferation.展开更多
Objective To observe the therapeutic effect and side reactions of Tripterygium wilfordii Hook,f. ( GTW) glycosides on patients with uterine leiomyomas. Methods 65 normally cycling women with symptomatic uterine leiomy...Objective To observe the therapeutic effect and side reactions of Tripterygium wilfordii Hook,f. ( GTW) glycosides on patients with uterine leiomyomas. Methods 65 normally cycling women with symptomatic uterine leiomyomas received 40mg daily dose GTW for 3 to 6 months. Baseline ultrasound tests were obtained to evaluate the sizes of myomas and uterus, then repeated three and six months after treatment. Blood samples were collected to determine the hormonal levels of in the mid-follicular and mid-luteal phases of the menstrual cycles before GTW therapy and at 3~4 months and 5~6 months after treatment. Results Significant decrease in leiomy-oma volume was shown in 39 of 65 (60% ) and 28 of 40 ( 70% ) patients after 3~4 months and 5~6 months of treatment, respectively. The decrease of the volume of leiomyoma was time-dependent as while 27. 84% and 51.60% in 3~4 months and 5 ~ 6months, respectively. 25 of 65 patients had amenorrhea during the course of treatment. Tripterygium wilfordii glycosides treatment induced a significant increase in LH and FSH levels (P < 0. 01) as compared with pretreatment values. In contrary, a significant decrease in E2 and P levels (P <0. 05) was found, but no changes were observed in T and PRL levels after treatment. Conclusion Tripterygium wilfordii might serve as an effective therapeutic agent for leiomyomas with fewer side effects. A reversible inhibitory effect on the ovary by Tripterygium wilfordii glycosides may be one of the mechanisms of Tripterygium wilfordii in decreasing leiomyoma volume.展开更多
With the increasing application of rare earths in the industrial fields of nuclear energy, metallurgy, petrochemical engineering and electronics, an urgent demand is made on the simple and rapid determination of indiv...With the increasing application of rare earths in the industrial fields of nuclear energy, metallurgy, petrochemical engineering and electronics, an urgent demand is made on the simple and rapid determination of individual rare earth elements, especiallly of those in dose vicinity. Rate differential kinetic method is a useful tool for the task t as展开更多
基金Sponsored by the China Postdoctoral Science Foundation (Grant No. 2003033332)Scientific Research Foundation of Harbin Institute of Technology (Grant No. HIT2002.24)
文摘The main role of water treatment plants is to supply high-quality safe drinking water. Coagulation is one of the most important stages of surface water treatment. The photometric dispersion analyzer(PDA) is a new optical method for flocculation monitoring, and is feasible to realize coagulation feedback control. The on line modification of the coagulation control system' s set point( or optimum dosing coagulant) has influenced the application of this technology in water treatment plant for a long time. A fuzzy control system incorporating the photometric dispersion analyzer was utilized in this coagulation control system. Proposed is a fuzzy logic inference control system by using Takagi and Sugeno' s fuzzy if-then rule for the self-correction of set point on line. Programmed is the dosing rate fuzzy control system in SIEMENS small-scale programmable logic controller. A 400 L/min middle-scale water treatment plant was utilized to simulate the reaction. With the changes of raw water quality, the set point was modified correctly in time, as well as coagulant dosing rate, and residual turbility before filtration was eligible and stable. Results show that this fuzzy inference and control system performs well on the coagulation control system through PDA.
文摘In the present work, the classical Bethe–Weizs?cker(BW) mass formula with five energy terms is revisited and updated. We use the least-squares adjustments on the binding energy of 2497 different nuclides from the last update of the atomic mass evaluation,AME2016 published in March 2017, to provide a new set of energy coefficients of the mass formula. The obtained set of formula coefficients allowed us to reproduce most of the experimental values of the binding energies for each nucleus with A ≥50. The comparison between the binding energies provided with updated mass formula and those of AME2016 on the one hand, and those of previous works,on the other hand, yields relative errors that oscillate between less than 0.05% and 1.5%. The revisited BW formula is in very good agreement with the experimental data.
文摘The early responses of pig skin to fractionated doses of fast neutrons (35 Mev P→B) were determined. A neutron fractionation scheme comprised of 12 fractions in 42 days. The lowest doses of Ⅰ, Ⅱ, Ⅲ degree erythema of pig skin by Irradiation were 16. 38, 17. 32 and 19. 78 Gy respectively. The ED50 Values for moist desquamation was 23. 40 Gy. The mean latency of early pig skin damage was prolonged with the decreasing of total dose. The degree and the incidence of early pig skin damage were associated with total dose.These results for fast neutron therapy facility can be extrapolated to the human situation with a high degree of confidence, so that the neutron dose which would yield acceptable skin damage in patients may be determined using the data presented here.
文摘Between October 1985 and June 1992 Postoperative kelolds of 125 Patients were treated with superficial X-ray (100-140 Kv) and electron beam (6 and 9 MeV ), in an attempt to prevent their recurrence, 100 patients with 129 sites received a dose of 1200-4000 cGy at 200-300 cGy per fraction within one to four weeks and at intervals of one to three weeks between excision and irradiation. Rate of success In the prevention of kelold was only 28. 6% (37/ 129). However, 25 patients with 25 sites received a total dose of 1500 cGy at 500 cGy per fraction starting within one week after excision and at Intervals of 96 hours. The success rate was 84% (21/25).
文摘The dewaterability of activated sludge conditioned by chitosan flocculant was studied. The effects of chitosan characteristics such as molecular weight, degree of deacetylation, and dose on the dewaterability were investigated. The sludge dewaterability is evaluated in terms of specific resistance to filtration, residual turbidity of supernatant, moisture content of cake, and settling rate. Sludge dehydrating behaviors conditioned with CTS, PAM and PAC flocculants were compared. The conditioning was also carried out with dual flocculants in two stages. It is found that the sludge conditioned with CTS has better dewaterability than that with PAC. The optimum conditions with chitosan are: dose 0.8 - 1.2 g per 100 g dry cake, molecular weight 300,000, and degree of deacetylation 70%. The conditioning in two stages with dual flocculants is found to be more effective than that with single flocculant.
文摘To investigate the radioimmunotherapeutic efficacy, radio-immunoconjugate 131-I-3G9, 811-I-3H11 and 131-I-NMIgG (irre levant antibody) were i.p. injected into nude mice bearing human gastric cancer xenograftes. Each animal received a single doses of 555MBq. Over 14 days the accumulative absorbed doses in tumors were 13.7 Gy for 131-I-3H11 and 12.17 Gy for 131-I-3G9. Both were significantly higher than that for 131-I-NMIgG (3.23 Gy). Thera peutic efficacy appeared most sharply from 2 to 3 weeks after injection. The inhibition ratio of tumor were 86% and 70% for 131-I-3H11 and 131-I-3G9 respectively. Histopathological evidance indicated that in tumor tissues radioactive damage was showed as karyopyknosis, karyorrhexis and necrosis or partial disappearance of tumor cells, while in the other tissues no radioactive damage was observed. WBC counts of all animals did not show significant difference before and after treatment, which indicated that the haemopoietic function of bone marrow was not affected.
文摘A new polysaccharide compound (ACPS-R) has recently been isolated from the root of Actinidia Chinensis Planch. When given inttaperitoneally to the transplantable tumor bearing mice at dose of 75-125 mg/kg, the tumor inhibition rate was more than 88.8% in Ehrilich ascitic cancer (EAC) or ascitic from of hepatoma (HepA) and more than 49.6% in solid hepatoma (HepS). The treatment effect of ACPS-R on EAC at dose of 80-100 mg kg and 125 mg/kg were comparable to that of cyclophosphamide at dose of 15 mg/kg and 22.5 mg/kg, respectively. ACPS-R could also prolong the life of EAC- or P388-bearing mice, and increase the percentage of EAC-free mice. In addition, when ACPS-R was used in combination with 5-Fu, the antitumor effect was enhanced as compared with 5-Fu alone. A marked increase in cAMP levels end cAMP cGMP ratio of spleen of EAC-bearing mice were observed after treatment of ACPS-R. The increase of both para meters nearly reached the normal levels of healthy mice. The increases of cAMP, cAMP cGMP and tumor remission had statistical significance. It showed an intermediate inhibitory effect of ACPS-R on DNA synthesis by incorporating 3H-TdR into EAC cells.The results indicated that ACPS-R acts as a new antitumor polysaccharide, and the treatment effect of Actinidia root in folk medicine is probably related to ACPS-R.
文摘Harringtonine(H) level in serum was quantified by high-performance liquid chromatographic (HPLC) technique and its pharmacokinetic parameters were determined in 11 patients with ANLL after 4 hours continuous infusion of 4 mg of H. 74 serum samples over the range of H administered 1-6 mg/d were also determined, the dose of H administered paralleled the mean serum H concentration, but the highest concentration were 1.6-7 folds higher than the lowest under the same doses. It seems that the dosage of harringtonine must be individualized in order to achieve better antileukemia effect. It was found that under the similar serum H concentration the marrow blast decrease index (MBDI) in types M4 and M5 of ANLL is much more greater than in M2 after the first course of chemotherapy and in 3 patients of M2, the serum H level and the MBDI show positive correlation.
文摘From July 1969 to November 1991, 4 patients with primary malignant lymphoma of the larynx were treated.One case was received radiotherapy and followed- up survey for 20 years being healthy, 3 case were received radiotherapy and chemotherapy. A total dose of 45-60 Gy was delivered. The disease can be classified four clinical types, (1) localized laryngeal lymphoma; (2) cephalocevical and larynx lymphoma; (3) laryngeal pieces region lymphoma; and (4) laryngeal pieces wildly spreaded lymphoma. The favorable prognostic factors were clinical course, clinical staging and the mode of treatment.
文摘Fifteen patients with unresectable hepatocellular carcinoma were treated with unresectable hepatocellular carcinoma were treated with high dose MMC or ADR via hepatic artery with drug filtration in our hospital from April to December 1988. Among them, 11 cases (73%) had symptoms relief, 3 cases (20%) tumor minimal remission and AFP decreased in 4 cases (33%). One case dide of hep'atoma 8 months after HAI-F and another case was followed up only 2 months after treatment, the remaining 13 cases are alive for 5 to 10 months after HAI-F. The reasons of unsatisfactory results were analyzed and possible ways of improvement were suggested.
文摘From Dec. 1976 through June 1986, 474 patients with acute leukemia were treated with central nervous system (CNS) irradiation for the purpose of preventing relapse of CNS leukemia. Of the whole series, whole cranial irradiation at a dosage of 24 Gy and 4-5 intrathecal instillations of methotrexate (MTX) were given in 149 patients, simple intrathecal instillation of MTX in 44 patients and high dose intravenous MTX in 5 patients; the CNS relapse rates were 4.0%, 20.5% and 40.0% respectively. It was proved by our experience that whole cranial irradiation plus intrathecal MTX is the best approach to prevention of CNS leukemia relapses.
文摘Using cytotoxicity and thymidine uptake assays, we investigated the effects of human recombinant in-terleukin-2 (rIL-2) on the induction of lympholine-activated killer (LAK) activity and cellular proliferation in splenocytes and thymocytes from human fetuses (18-22 weeks). We observed that fetal splenocytes and thymocytes incubated with low doses of rIL-2 (10-100 U ml) developed broad antitumor activity (LAK activity) although the kinetics and magnitudes of the responses were different. It indicated the LAK precursors are present in fetal spleen and thymus. Further, rIL-2 induced a strong proliferative response in splenocytes, but not in thymocytes. On the basis of the findings, we conclude that the responses of fetal splenocytes and thymocytes to IL-2 are different.
文摘Generally, TGF-βs are held to down- regulate the growth of immune cells and to inhibit the development of certain differentiated functions, such as the induction of LAK activity by IL-2. In the present study, the effects of TGF-β1 on the proliferation and cytotoxicity of human PBMC activated by anti-CD3 or and-CD3 plus anti-CD28 was investigated. The results demonstrated that TGF- β1 clearly inhibits the induction of cytotoxic ability in human PBMC stimulated via CD3 or CD3 and CD28 ( P<0. 01) , without significantly altering the proliferative response to these stimuli, at the tested doses of TGF-β1. Co-stimulation with IL-2 was hardly altered, suggesting that TGF-β1 action is affected by the nature of the costimulatory signals.
基金This study was supported by National Natural Sciences Foundation of China (No. 30200247)
文摘Objective: To investigate the effect of Malytea Scurfpea fruit (MSF) on adhesion and migration of melanocyte. Methods: Human epidermal melanocytes were treated with MSF and examined for its adhesion to bovine serum fibronectin-coated culture plate and for its migration into micropore filters, which were then compared with those of untreated control. Results: Compared with the control, MSF treated melanocytes were easier to adhere to the dishes and move into the filters in a dose-dependent manner, but when the dose of MSF was higher than 150 μg/ml, the adhesion and migration could not be significantly increased. And it was noticed that when the concentrations of MSF was 10μg/ml, significant statistical difference did show between the migration of the treated and untreated melanocytes ( P<0.05) though the adhesion was not increased significantly. Conclusion: MSF had the ability to affect melanocyte adhesion and migration. This could explain, in part, the mechanism of MSF in curing vitiligo lesions.
文摘Objective: To explore the molecular regulation mechanism of carvedilol in attenuating the reversion back towards fetal energy metabolism during the development of cardiac hypertrophy induced by coarctation of abdominal aorta (CAA) in male Wistar rats. Methods: Hemodynamic and ventricular remodeling parameters, free fatty acid content in the serum were measured in the experimental animals at 16 weeks after the surgical CAA, the rats receiving carvedilol intervention (CAR) after CAA, and those with sham operation (SH). The expressions of muscle carnitine palmitoyltransferaseⅠ (M-CPTⅠ) and medium chain acyl-CoA dehydrogenase (MCAD) mRNA in the cardiac myocytes from every group were studied with RT-PCR. Results: Significant left ventricular hypertrophy were observed in the rats 16 weeks after coarctation operation (P<0.05), together with significant free fatty acids accumulation and downregulation of M-CPTⅠ and MCAD mRNA (P<0.05) in CAA group. Carvedilol at a dose of 30 mg/kg/d for 12 weeks inhibited the left ventricular hypertrophy induced by pressure overload and enhanced the gene expressions of rate-limiting enzyme (M-CPTⅠ) and key enzyme of fatty acid (MCAD) in the CAR group compared with CAA group (P<0.05). Conclusion: Pressure overload-induced hypertrophy in CAA rats causes the reversion back towards fetal enery metabolism, that is, downregulates the expressions of rate-limiting enzyme and key enzyme of fatty acid oxidation. The intervention therapy with carvedilol, a vasodilating alpha- and beta-adrenoreceptor antagonist, attenuates the reversion of the metabolic gene expression to fetal type through upregulating M-CPTⅠ and MCAD mRNA expressions. Thus, carvedilol may exert cardioprotective effects on heart failure by the mechanism of preserving the adult metabolic gene regulation.
文摘The specimens were from 110 patients with primary hepatic carcinoma. The formalin- fixed and paraffin-embedded sections were stained for HBxAg by ABC method and for HBsAg and HBcAg by PAP method. Of the 110 cases, 64 (58. 2%) showed HBxAg-positive reaction in tumor tissue, and 63 (78. 8%) of 80 cases displayed positive HBxAg in surrounding non-cancerous hepatic tissue. Among the 64 cases with positive HBxAg in tumor tissue, 15 (23. 4%) were associated with HBsAg and/or HBcAg, while in the 63 cases with positive HBxAg in non-tumor tissue, 45(71. 4%) were accompanied with HBsAg and/or HBcAg. These findings suggest a dose relationship between prlmay hepatic carcinoma and HBV infection. The high detection rate of HBxAg Indicates a very active expression of the Integrated HBV- DNA genome in the host cells. However, the action of HBxAg in pathogenesis of hepatocellular carcinoma remains to be further investigated.
文摘Four cases of primary plasma cell leukemia (PPCL) admitted to Zhongshan Hospital from 1959 to 1987 are reported with a review on additional 40 cases reported in China. Comparing with the 57 cases of multiple myeloma (MM) treated in our hospital, the following features were observed in PPCL: (1) The age was younger, with a mean of 45.2 years, 34.1% of the patients were under 40 years. (2) Onset was abrupt. Duration from onset to diagnosis was 2 months or less in 77% patients but never beyond 6 months. (3) 81.8% patients had liver enlargement, 59.1% splenomegaly and 61.4% sternum tenderness. (4) All patients showed marked anemia with an average hemoglobin of 65 g/L. BPC count was less than 100 × 109/L in 76% patients and WBC was more than 10×109/L in 77%. (5) Plasma cell number in the marrow was markedly increased with an average of 69%, of which the blast cells and immature forms were predominant. (6) No destruction of bones was shown on X-ray film in 68.3% patients. (7) The response to chemotherapy was poor with a total response rate of 18% and a mean survival of 2 months. All the above-mentioned clinical features were significantly different from those of MM. In addition, these two diseases were also different in cytology, cytogenetics and ultrastructure. Therefore, PPCL should be considered as a special type of acute leukemia distinct from MM. High dose of alkylating agents in combination with autologous bone marrow transplantation might improve the prognoses.
文摘Objective: To investigate changes of Ca2+ activated potassium channels (KCa) in autogenous vein grafts. Methods: Contraction of venous ring was measured by means of perfusion in vitro. The intimal rabbits proliferation of vascular and proliferation of cultured smooth muscle cells(vascular smooth muscle cells, VSMCs)were observed by the means of computerised image analysis and MTT method respectively. Furthermore, whole cell mode of patch clamp was used to record KCa of VSMCs isolated from autogenous vein grafts. Results: One week after transplantation there were no significant differences of contraction and intimal relative thickness between autogenous vein grafts and control. Contraction and intimal relative thickness of autogenous vein graft were significantly increased 2 weeks after transplantation (P<0.05, n=8 vs control), and they was more enhanced 4 weeks after vein transplantation (P<0.01, n=8 vs control).TEA(blocker of Ca2+ activated potassium channels)increased MTT A490 nm value of VSMCs from femoral vein in a dose dependent manner(P<0.05, n=8). KCa current density was significantly attenuated in VSMCs from autogenous vein grafts (1-4) week after transplantation(P<0.05, n=5).Conclusion: KCa is inhibited in autogenous vein graft, which account for vasospasm and intimal proliferation.
文摘Objective To observe the therapeutic effect and side reactions of Tripterygium wilfordii Hook,f. ( GTW) glycosides on patients with uterine leiomyomas. Methods 65 normally cycling women with symptomatic uterine leiomyomas received 40mg daily dose GTW for 3 to 6 months. Baseline ultrasound tests were obtained to evaluate the sizes of myomas and uterus, then repeated three and six months after treatment. Blood samples were collected to determine the hormonal levels of in the mid-follicular and mid-luteal phases of the menstrual cycles before GTW therapy and at 3~4 months and 5~6 months after treatment. Results Significant decrease in leiomy-oma volume was shown in 39 of 65 (60% ) and 28 of 40 ( 70% ) patients after 3~4 months and 5~6 months of treatment, respectively. The decrease of the volume of leiomyoma was time-dependent as while 27. 84% and 51.60% in 3~4 months and 5 ~ 6months, respectively. 25 of 65 patients had amenorrhea during the course of treatment. Tripterygium wilfordii glycosides treatment induced a significant increase in LH and FSH levels (P < 0. 01) as compared with pretreatment values. In contrary, a significant decrease in E2 and P levels (P <0. 05) was found, but no changes were observed in T and PRL levels after treatment. Conclusion Tripterygium wilfordii might serve as an effective therapeutic agent for leiomyomas with fewer side effects. A reversible inhibitory effect on the ovary by Tripterygium wilfordii glycosides may be one of the mechanisms of Tripterygium wilfordii in decreasing leiomyoma volume.
基金Project supported by the Science Fund of Academia Sinica
文摘With the increasing application of rare earths in the industrial fields of nuclear energy, metallurgy, petrochemical engineering and electronics, an urgent demand is made on the simple and rapid determination of individual rare earth elements, especiallly of those in dose vicinity. Rate differential kinetic method is a useful tool for the task t as
