1101
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Zheng Y, Shen J. Gait synthesis for the SD-2 biped robot to climb sloping surface. ACTA ACUST UNITED AC 1990. [DOI: 10.1109/70.88120] [Citation(s) in RCA: 113] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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1102
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Shen J. [Von Willebrand factor in acute leukemia]. ZHONGHUA YI XUE ZA ZHI 1990; 70:26-8, 4. [PMID: 2157535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Using Laurell's rocket and crossed immunoelectrophoresis, we studied the function of vWF on the basis of its quantity and quality. The ristocetin-induced platelet aggregation was also investigated. The results revealed that the level of plasma vWF:Ag in acute leukemia (88.53 +/- 46.33%) was significantly higher than that in normal controls (90.53 +/- 29.54%) (P less than 0.01) and markedly decreased as these cases were in partial or complete remission (105.29 +/- 26.65%) (P less than 0.01), but there were no significant differences between the cases with (204.76 +/- 68.17%) and those without bleeding tendency (174.77 +/- 65.78%), nor between ALL (185.22 +/- 62.19%) and ANLL (192.43 +/- 77.97%) (P greater than 0.05). Compared with normal controls, crossed immunoelectrophoresis of plasma vWF in 21 cases showed a rapid migration of the precipitin arcs toward the positive pole in 16 cases. This indicates that there is a relatively increased amount of small multimers in the plasma, which do not have the active function of vWF so that the ristocetin-induced aggregation was reduced or even absent in those 21 cases (the maximum aggregation rate was 62.89 +/- 34.02% in the patients and 104.69 +/- 12.13% in normal controls (P less than 0.01). The possible mechanism and clinical significance of these changes are discussed.
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1103
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Shen J, Subramaniam S, Wong CF, McCammon JA. Superoxide dismutase: fluctuations in the structure and solvation of the active site channel studied by molecular dynamics simulation. Biopolymers 1989; 28:2085-96. [PMID: 2605312 DOI: 10.1002/bip.360281205] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The molecular dynamics (MD) simulation of superoxide dismutase (SOD) in water is carried out for a total of 23 ps. The simulation system is a 26 A sphere centered at the active site of SOD, including 1602 atoms from SOD and 1761 water molecules. There is no gross deviation from the x-ray structure for the average MD structure. The structure and potential fluctuations around the active site are examined. The results provide new insight to the interactions between SOD and its substrate superoxide.
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1104
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Chen B, Shen J, Sun Q, Hu S. Development of an expert system for synthesis of heat exchanger networks. Comput Chem Eng 1989. [DOI: 10.1016/0098-1354(89)87027-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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1105
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1106
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Danias P, Nicklas WJ, Ofori S, Shen J, Mytilineou C. Mesencephalic dopamine neurons become less sensitive to 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine toxicity during development in vitro. J Neurochem 1989; 53:1149-55. [PMID: 2788714 DOI: 10.1111/j.1471-4159.1989.tb07408.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The in vitro development of monoamine oxidase (MAO) activity and [3H]dopamine (DA) uptake capacity of dissociated cell cultures from rat embryo mesencephalon were correlated with the potency of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) and 1-methyl-4-phenylpyridine (MPP+) neurotoxicity. Specific activities of both MAO-A and MAO-B increased during in vitro development of the cultures, with MAO-B activity increasing 20-fold between the first and fourth week. Similarly, [3H]DA accumulation increased 2.6-fold between the first and third week in vitro, when it reached a plateau. Unexpectedly, the toxicities of MPTP and MPP+ were substantially decreased in the older cultures. Exposure to MPTP reduced [3H]DA accumulation per culture by 77% in 1-week-old cultures and by 36% in 4-week-old cultures. Similarly, damage caused by MPPT was reduced from 84% of control in the first week to 34% of control in the fourth week. The attenuation of neurotoxicity was not due to an increase in storage of MPP+ in the synaptic vesicles of DA neurons, nor to a change in the distribution of MPP+ between dopaminergic and other cellular components of the cultures. The damage to DA neurons caused by the mitochondrial toxin, rotenone, also showed a similar reduction in the older cultures. These observations coupled with an increase in lactate formation and glucose consumption during the in vitro development of the cultures suggest a shift toward increased glycolysis and decreased dependence on aerobic metabolism. This would render the cells more resistant to the inhibition of mitochondrial function by MPP+.
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1107
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Shen J. [Hemodynamic effects of naloxone in early acute pancreatitis in the dog and its efficacy in treating acute pancreatitis]. ZHONGHUA WAI KE ZA ZHI [CHINESE JOURNAL OF SURGERY] 1989; 27:173-6, 190. [PMID: 2776562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Naloxone, an opiate receptor blocker, has been shown in earlier studies to have positive effect on cardiovascular function in a variety of diseases in which the secretion of endogenous opioid peptides was suspected. In this communication, a dog model of acute pancreatitis (AP) was made by intraductal injection of fresh trypsin-bile mixture, in which the hemodynamic changes were measured, the therapeutic efficacy of naloxone was evaluated. Pancreatitis was characterized by a fall in SAP, CO, dp/dt, an increase in PVR, SVR and the early reduction of pancreatic blood flow (QP). Administration of naloxone produced a significant increase in QP and led to normalization in SAP, CO, dp/dt, PVR and, SVR. In addition, Naloxone significantly reduced the severity and mortality of AP. These results suggest that naloxone appears to limit the progression from edematous to hemorrhagic pancreatitis through preserving QP at the early phase of AP. We propose the hypothesis that endogenous opiates may play a role in the pathophysiology of AP.
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1108
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Schulz MJ, Shen J. Treatment of stage I endometrial carcinoma. THE JOURNAL OF REPRODUCTIVE MEDICINE 1989; 34:167-72. [PMID: 2926733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Cases of stage I endometrial carcinoma treated at Columbia-Presbyterian Medical Center, New York, between 1966 and 1980 were evaluated with regard to clinical parameters, surgicopathologic findings, treatment modalities and survival. Four factors significantly influenced survival: tumor grade, patient's age, uterine size and addition of postoperative external radiotherapy in cases of significant myometrial invasion or a poorly differentiated lesion. No deaths or significant morbidity resulted from the use of adjuvant whole pelvic radiation.
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1109
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Shen J. [Value of colonoscopy in postoperative care of colorectal carcinoma]. ZHONGHUA WAI KE ZA ZHI [CHINESE JOURNAL OF SURGERY] 1989; 27:102-4, 126. [PMID: 2776533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
From 1981 to 1986, fiberoptic colonoscopy was performed in 2225 patients, of whom 356 cases (16%) were operated on for colorectal carcinoma and followed up for three months to twenty years. 27 cases were detected to have a second primary cancer and 1 case third primary cancer. In addition, 1 case of carcinoid, 6 cases of in-situ cancers, and 77 cases of adenomas were found. Among the 138 asymptomatic cases, 8 were proved to have a second cancer and 6 to be in early stage. Among the remaining 218 symptomatic cases, 26 with second cancers and 10 in the early stage were detected. The study shows that periodic colonoscopic examinations are mandatory for asymptomatic postoperative patients.
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1110
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Shen J, Israël G. A receptor model using a specific non-negative transformation technique for ambient aerosol. ACTA ACUST UNITED AC 1989. [DOI: 10.1016/0004-6981(89)90190-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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1111
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Shen J, Kessler W, Denk B, Filser JG. Metabolism and endogenous production of ethylene in rat and man. ARCHIVES OF TOXICOLOGY. SUPPLEMENT. = ARCHIV FUR TOXIKOLOGIE. SUPPLEMENT 1989; 13:237-9. [PMID: 2774936 DOI: 10.1007/978-3-642-74117-3_39] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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1112
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Zhu NS, Ling ZH, Shen J, Lane JM, Hu SL. Factors associated with the decline of the Cooperative Medical System and barefoot doctors in rural China. Bull World Health Organ 1989; 67:431-41. [PMID: 2805221 PMCID: PMC2491275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
The Cooperative Medical System (CMS) and its barefoot doctors have been in decline in rural China for nearly a decade. In order to explore the reasons for this, in 1987 we carried out a survey of villagers, barefoot doctors, and local administrators in Fengxian, Shanggoa, and Loaan counties, where incomes are good, fair, and low, respectively. The state of the CMS in these counties was contrasted and the situations which prevailed in 1978, 1982, and 1985, when the system was, respectively, at its peak, had begun to decline, and had declined markedly, were compared. A random sample of villages was selected and all the barefoot doctors and administrators as well as a random sample of households were surveyed. The results indicate that health status (as measured by infant mortality, immunization coverage, and rate of infectious diseases) has decreased in areas where the CMS has declined, while per capita incomes increased. Concomitantly, villager's expenditures on health care have increased. Barefoot doctors and their patients were, however, reasonably happy with the system, and in its absence the doctors are no longer able to obtain ongoing training. The CMS was fiscally sound, and did not decline to the same extent in all areas--it continues to thrive in Fengxian, which is relatively affluent. It is concluded that the system probably declined because many local administrators perceived that it no longer enjoyed the backing of the central government.
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1113
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Ren SY, Dow JD, Shen J. Deep impurity levels in semiconductor superlattices. PHYSICAL REVIEW. B, CONDENSED MATTER 1988; 38:10677-10692. [PMID: 9945923 DOI: 10.1103/physrevb.38.10677] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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1114
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Shen J, Chang X, Wang CC. [Hepatic protection of indomethacin against carbon tetrachloride toxicity in rats]. SHENG LI XUE BAO : [ACTA PHYSIOLOGICA SINICA] 1988; 40:502-9. [PMID: 3251362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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1115
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Shen J. [Identification of essential oil from semen litchi]. ZHONG YAO TONG BAO (BEIJING, CHINA : 1981) 1988; 13:31-2, 63. [PMID: 3208398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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1116
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Ran RC, Shen J. Polymer-Supported Lewis Acid Catalysts. III. Diphenylaminomethylpolystyrene-Titanium Tetrachloride Complex. ACTA ACUST UNITED AC 1988. [DOI: 10.1080/00222338808052130] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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1117
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Zhao ZZ, Xie ZW, Shen J. [Original botanical study and identification of Flos Magnoliae]. ZHONG YAO TONG BAO (BEIJING, CHINA : 1981) 1988; 13:3-4, 61. [PMID: 3203435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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1118
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Xie BT, Xu JZ, Shen J, Zhang LC, Chen C, Wu FQ. [Studies on microbial polynucleotide phosphorylase]. WEI SHENG WU XUE BAO = ACTA MICROBIOLOGICA SINICA 1988; 28:149-54. [PMID: 3201777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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1119
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Zhao ZZ, Xie ZW, Shen J. [A new species and a variety's new nomenclature of the medicinal xin-yi (Flos Magnoliae)]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1987; 22:777-80. [PMID: 3450130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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1120
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Shen J, Hughes C, Chao C, Cai J, Bartels C, Gessner T, Subjeck J. Coinduction of glucose-regulated proteins and doxorubicin resistance in Chinese hamster cells. Proc Natl Acad Sci U S A 1987; 84:3278-82. [PMID: 3106964 PMCID: PMC304852 DOI: 10.1073/pnas.84.10.3278] [Citation(s) in RCA: 136] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
The glucose-regulated protein (GRP) system in mammalian cells is induced by glucose deprivation, anoxia, the calcium ionophore A23187, and 2-deoxyglucose. In Chinese hamster ovary cells the major GRPs are approximately equal to 76, 97, and 170 kDa. Removal of each of these four GRP-inducing stresses leads to the coordinate repression of GRPs and induction of the major heat shock proteins at 70 and 89 kDa. The application of each of these four GRP-inducing conditions leads to a significant induction of resistance to the drug doxorubicin. Removal of each GRP-inducing condition results in the rapid disappearance of this resistance in a manner that correlates with the repression of the GRPs. The retention of doxorubicin by GRP-induced cells does not explain the induced drug resistance. When the RIF in vitro/in vivo tumor system is probed with an antibody against the 76-kDa GRP, a significant increase in this GRP is observed in cells obtained from the central regions of tumors. Since hypoxia and/or nutrient deprivation can occur during tumor development, a GRP-induced state in the tumor may confer resistance to doxorubicin treatment.
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1121
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Lee YN, Shen J, Klotz PJ, Schwartz SE, Newman L. Kinetics of hydrogen peroxide-sulfur(IV) reaction in rainwater collected at a northeastern U.S. site. ACTA ACUST UNITED AC 1986. [DOI: 10.1029/jd091id12p13264] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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1122
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Shen J. [[Estimating the error of random projection of discrete populations]]. REN KOU YAN JIU = RENKOU YANJIU 1985:51-2. [PMID: 12341401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
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1123
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Shen J, Chen C, Sauer J. Effects of sorbed water on properties of low and high molecular weight PMMA: 1. Deformation and fracture behaviour. POLYMER 1985. [DOI: 10.1016/0032-3861(85)90150-8] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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1124
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Chen C, Shen J, Sauer J. Effects of sorbed water on properties of low and high molecular weight PMMA: 11. Fatigue performance. POLYMER 1985. [DOI: 10.1016/0032-3861(85)90061-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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1125
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Chao CF, Subjeck JR, Brody H, Shen J, Johnson RJ. The effect of nitroimidazoles on glucose utilization and lactate accumulation in mouse brain. Radiat Res 1984; 97:87-96. [PMID: 6695046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The radiation sensitizers misonidazole (MISO) and desmethylmisonidazole (DMM) can produce central and peripheral neuropathy in patients and laboratory animals. Behavioral and pathological investigations have indicated that in the central nervous system this primarily involves the cochlear and vestibular systems. Nitroimidazoles can also interfere with glycolysis in vitro under aerobic and anaerobic conditions. In the present work we have studied the effect of MISO or DMM on lactate production and glucose utilization in mouse brain. It is observed that these compounds result in a 25% inhibition of lactate production in brain slices relative to the control at a 10 mM level. Additionally, MISO (1.0 mg/g/day) or DMM (1.4 mg/g/day) were administered daily (oral) for 1, 4, 7, or 14 days to examine the effect of these two drugs on the regional glucose utilization in C3Hf mouse brain. Five microcuries of 2-deoxy[14C]glucose was given following the last drug dose and autoradiographs of serial brain sections were made and analyzed by a densitometer. Following a single dose of either MISO or DMM, no significant differences in glucose uptake were observed when compared with controls. However, following 4, 7, and 14 doses the rate of glucose utilization was significantly reduced in the intoxicated animals. Larger reductions were measured in specific regions including the posterior colliculus, cochlear nuclei, vestibular nuclei, and pons with increasing effects observed at later stages. These results share a degree of correspondence with the regional brain pathology produced by these nitroimidazoles.
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