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Ding M. Topological entropy and bifurcations of chaotic scattering. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1992; 46:6247-6251. [PMID: 9907935 DOI: 10.1103/physreva.46.6247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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352
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Wang S, Hamberger A, Ding M, Haglid KG. In vivo activation of kainate receptors induces dephosphorylation of the heavy neurofilament subunit. J Neurochem 1992; 59:1975-8. [PMID: 1328537 DOI: 10.1111/j.1471-4159.1992.tb11037.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Injection of kainic acid (KA) into the rat hippocampus reduced the phosphorylation-related immunoreactivity of the heavy subunit of neurofilament proteins (NF-H). The effect was demonstrated quantitatively with a dot-immunobinding assay and qualitatively by immunoblotting with monoclonal antibodies against phosphorylation-dependent and nonphosphorylation-related epitopes of NF-H. The KA-induced reduction affected 50% of the phosphorylated NF-H in half of the hippocampus after 48 h. At the same time, the nonphosphorylation-related NF-H immunoreactivity increased as revealed by immunoblotting, indicating a shift from phosphorylated to nonphosphorylated NF-H. The effects on NF-H preceded a decrease in content of the neuron-specific enolase, a soluble neuronal cytoplasmic protein. No alterations of the light subunit of neurofilament proteins occurred, suggesting that KA has a preferential effect on NF-H phosphorylation. N-Methyl-D-aspartate administered similarly did not lead to a rapid dephosphorylation of NF-H. We propose that kainate receptor-mediated dephosphorylation in NF-H is involved in the signal transduction of excitatory amino acids with consequences for neuronal functions dependent on intermediary filament phosphorylation.
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353
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Lai YC, Ding M, Grebogi C, Blümel R. Algebraic decay and fluctuations of the decay exponent in Hamiltonian systems. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1992; 46:4661-4669. [PMID: 9908682 DOI: 10.1103/physreva.46.4661] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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354
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Zou ZZ, Wang XH, Zhu CG, Ding M, Zhu XX, Li ZB. [A dynamic observation on the fate of samarium in mouse liver]. SHI YAN SHENG WU XUE BAO 1992; 25:217-25. [PMID: 1476014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
It is generally considered that the rare earth compounds are plasma membrane-impermeable, thus affecting the cells only on their surface. Recently, we found that after repeated injections to mice of large dose of samarium trichloride, a soluble compound of rare earth, samarium aggregates appeared in Kupffer cells and hepatocytes of liver. In this study, we aimed at observing the route by which samarium enters the liver cells and the process of the formation of samarium aggregates. Samarium trichloride was given to Swiss mice at one dose of 70 mg/kg intravenously. Thereafter, at different intervals from 15 min to 48 h after the injection, the samarium in liver was traced dynamically by electron microscopy and X ray microanalysis. From 15 min to 2 h both Kupffer cells and hepatocytes endocytosed samarium-containing particles and formed phagosomes, in which the ingested particles were progressively concentrated. Besides, the small phagosomes fused with each other. Phagocytosis was especially active in Kupffer cells. During the 4 h to 24 h many Kupffer cells were degenerated and broken. In hepatocytes the phagosomes gathered mostly around the bile canaliculi. Groups of highly electron-dense particles were found in the lumen of bile canaliculi, implying the excretion of samarium by bile. At the 48 h, the samarium-containing phagosomies were found still in both kinds of cells in the liver.
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355
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Ding M. [A prospective trial of hemodilution therapy in acute cerebral infarction]. ZHONGHUA SHEN JING JING SHEN KE ZA ZHI = CHINESE JOURNAL OF NEUROLOGY AND PSYCHIATRY 1992; 25:146-9, 190. [PMID: 1382927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Ninety two 50-year-old-or-more patients with acute (less than 72 hours) cerebral infarction involved middle cerebral artery region and hematocrit of 40% or more were prospectively randomised to either hemodilution group (by rapid venesection, venous infusion of autologous plasma and 500 ml dextran 40) or standard therapy group. Effects of hemodilution on acute cerebral infarction were evaluated by clinically neurological deficit scores, hemorheological parameters and size of infarction. The results of our clinical trial are: 1. Clinical efficacy of hemodiluted patients is significantly superior to that of standard treatment patients. Effective rates are 63.04% and 41.30% respectively (P less than 0.05). 2. At 48th hour after hemodilution there are profound decreases in hematocrit, blood viscosity at high shear rate and blood viscosity at low shear rate. These changes last more than four weeks. Whereas in standard group, hemorheological parameters do not evidently change. 3. Sizes of cerebral infarction do not distinctly change in both groups between at entry and at the fourth weekend after treatment.
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356
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Tsunenari S, Higashi T, Kibayashi K, Pang H, Ding M, Jia J. Genetic polymorphism of human factor H (HF, beta 1H globulin) in Chinese Han population in northeast China. THE JAPANESE JOURNAL OF HUMAN GENETICS 1992; 37:145-8. [PMID: 1391970 DOI: 10.1007/bf01899736] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The distribution of human factor H of serum phenotypes were studied using ultrathin polyacrylamide gel isoelectric focusing (PAGIEF) and subsequent immunoblotting techniques in 203 Chinese of Han population in Liaoning Province of northeast China. The gene frequencies of HF*A and HF*B were 0.4828 and 0.5172, respectively. All the observed numbers of the phenotypes were in agreement with the expected numbers under the Hardy-Weinberg equilibrium. The gene frequencies among Chinese, Japanese, and Caucasian populations were compared.
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357
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Ding M, Dyke CM, Abd-Elfattah AS, Lehman JD, Dignan RJ, Wechsler AS. Efficacy of a hydroxyl radical scavenger (VF 233) in preventing reperfusion injury in the isolated rabbit heart. Ann Thorac Surg 1992; 53:1091-5. [PMID: 1596134 DOI: 10.1016/0003-4975(92)90395-k] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
We tested the hypothesis that 3,4,5,-trihydroxybenzamidoxime (VF 233), a demonstrated hydroxyl radical scavenger and an effective Fe3+ chelator, attenuates reperfusion injury and improves isovolumic left ventricular function. Eighteen isolated, perfused rabbit hearts with intracavitary balloons were subjected to normothermic, global ischemia until the initiation of ischemic contracture. Effects on the adenine nucleotide pool metabolites were determined by high-pressure liquid chromatography from right ventricular biopsy specimens before ischemia and at 15-minute intervals throughout reperfusion. In the experimental group (n = 9), a 5-mL bolus of 1 mol/L VF 233 was given immediately before reperfusion and followed by a continuous infusion (0.125 mumol/min). The control group (n = 9) received the vehicle solution at identical times. Rabbits treated with VF 233 had significant improvement in left ventricular function (expressed as percent return of left ventricular peak developed pressure) within 15 minutes of reperfusion (55.0 +/- 3.0 versus 66.2 +/- 4.1; p less than 0.05 by analysis of variance) after global ischemia and remained significantly improved throughout the reperfusion period. Myocardial adenine nucleotide pool intermediates were not significantly different between groups. These results demonstrate that administration of VF 233 significantly improves ventricular function but does not affect adenine nucleotide metabolism after ischemia and reperfusion.
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358
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Lai YC, Grebogi C, Blümel R, Ding M. Algebraic decay and phase-space metamorphoses in microwave ionization of hydrogen Rydberg atoms. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1992; 45:8284-8287. [PMID: 9906923 DOI: 10.1103/physreva.45.8284] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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359
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Jiao R, Yu W, Ding M, Zhai Z. Localization of adenovirus DNA by in situ hybridization electron microscopy. Microsc Res Tech 1992; 21:23-31. [PMID: 1591411 DOI: 10.1002/jemt.1070210104] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Biotinylated deoxyadenosine triphosphate (dATP) (Bio-7-dATP) and 3H deoxythymidine triphosphate (dTTP) labeled adenovirus DNA were hybridized in situ to thin sections of Lowicryl K4M-embedded and whole-mount extracted HeLa cells infected with adenovirus. The biotinylated probe was detected by exposing the extracted cells or sections to antibodies against biotin followed by colloidal gold-conjugated secondary antibodies and then critical-point dried while 3H-dTTP labeled probe by electron microscopic autoradiography. On Lowicryl K4M sections, gold particles and silver grains were mainly restricted in the nucleus. Furthermore, whole-mount results suggested that replicating adenovirus DNA is localized on the nuclear matrix of its host cell. In this paper, the described non-radioactive procedures for hybrid detection offered several advantages: a) rapid signal detection; b) superior morphological preservation and spatial resolution; c) precise localization; and d) on Lowicryl K4M sections, signal to noise equivalent to radiolabeling.
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360
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Gupta P, Kingsley L, Anderson R, Ho M, Enrico A, Ding M, Cottrill M, Wolinsky S, Rinaldo C. Low prevalence of HIV in high-risk seronegative homosexual men evidenced by virus culture and polymerase chain reaction. AIDS 1992; 6:143-9. [PMID: 1558712 DOI: 10.1097/00002030-199202000-00001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
OBJECTIVE To assess the presence of covert HIV-1 infection. SETTING High-risk seronegative homosexual men from the Pittsburgh portion of the Multicenter AIDS Cohort Study were examined for the presence of HIV-1 infection. PATIENTS, PARTICIPANTS Ten men (group 1) were examined prospectively for the presence of HIV-1 in their freshly-obtained peripheral blood mononuclear cells (PBMC). Furthermore, cryopreserved PBMC from 26 men (group 2) at their first visit (1984-1985) were examined retrospectively for the presence of HIV-1. MAIN OUTCOME MEASURES PBMC samples from groups 1 and 2 were examined for HIV-1 by polymerase chain reaction (PCR) using gag, env and strong-stop (long terminal repeat) specific primers. In addition, fresh PBMC samples from group 1 were examined for HIV-1 by virus culture. RESULTS None of the 10 PBMC samples from group 1 were positive for virus culture and PCR. Only one of the 26 men from group 2 was positive for gag and strong-stop DNA sequences. This PCR-positive, seronegative subject was found to be negative for HIV-1 by PCR at follow-up visits up to 48 months later. None of 15 seronegative, low-risk homosexual men and 12 seronegative heterosexual men were found to be PCR-positive for HIV-1. However, six HIV-1-seropositive men were positive by PCR for gag, env, and strong-stop HIV-1 DNA sequences. CONCLUSIONS These results suggest a low prevalence of covert HIV-1 infection in high-risk seronegative homosexual men in our geographic area.
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361
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Li AZ, Fan TY, Ding M. Formation study of toroidal condensation of DNA. SCIENCE IN CHINA. SERIES B, CHEMISTRY, LIFE SCIENCES & EARTH SCIENCES 1992; 35:169-75. [PMID: 1581001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A detailed study of the formation of toroidal condensation produced from the 2700 base pair fragments of plasmid PUC13 DNA, induced by metal ions, is introduced. We have extracted several typical intermediate structures based on investigation by electron microscopy, and compared their size distributions. The observations suggest that the formation process of DNA condensation is the process of folding and arranging DNA chains and that of disorder-order transition. The result also indicates that the condensed particles are polymeric, but not randomly aggregative, further proving the toroidal structures are formed in certain regularities.
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362
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Dignan RJ, Yeh T, Dyke CM, Lee KF, Lutz HA, Ding M, Wechsler AS. Reactivity of gastroepiploic and internal mammary arteries. Relevance to coronary artery bypass grafting. J Thorac Cardiovasc Surg 1992; 103:116-22; discussion 122-3. [PMID: 1728696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The gastroepiploic artery is an alternate conduit for coronary artery bypass grafting. To test the hypothesis that its vasoreactive properties are different from those of the internal mammary artery, we obtained gastroepiploic artery segments from human gastrectomy specimens. Trimmed internal mammary artery segments were obtained during coronary artery bypass. Ring segments were mounted on a strain gauge and stretched to optimum resting length (90% of the internal circumference at 100 mm Hg). Potassium chloride, serotonin, and norepinephrine were chosen to simulate physiologic vasospasm induced by depolarization, platelet aggregation, or adrenergic stimulation, respectively. Contractions to potassium and a concentration-response curve to serotonin or norepinephrine were obtained. Sodium nitroprusside was used to assess relaxation. Gastroepiploic artery segments had stronger contractions to the depolarizing agent (potassium chloride), adrenergic stimulation (norepinephrine), and product of platelet aggregation (serotonin). The gastroepiploic and internal mammary arteries showed equal sensitivity, measured by concentration causing half-maximal contraction to norepinephrine and serotonin. There was no difference in relaxation to sodium nitroprusside. These data suggest that prevention of platelet-, adrenergic-, or potassium-induced contraction may be more important when the gastroepiploic artery is used as an alternate conduit for coronary artery bypass, reinforcing consideration of nitrovasodilators and platelet inhibitors in the perioperative interval.
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363
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Dyke CM, Yeh T, Lehman JD, Abd-Elfattah A, Ding M, Wechsler AS, Salter DR. Triiodothyronine-enhanced left ventricular function after ischemic injury. Ann Thorac Surg 1991; 52:14-9. [PMID: 2069445 DOI: 10.1016/0003-4975(91)91410-w] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Hypothyroidism is associated with profound left ventricular dysfunction. Brain-dead organ donors and patients undergoing cardiopulmonary bypass are chemically hypothyroid with significantly reduced circulating free triiodothyronine (T3). To test the hypothesis that T3 enhances left ventricular function in a hormonally deficient environment, a total of 36 healthy New Zealand White rabbit hearts were studied using a modified Langendorff preparation with Krebs-Henseleit perfusate and intra-ventricular balloon. In 9 normal rabbit hearts a cumulative dose-response curve with logarithmically increasing doses of T3 was obtained. The vehicle solution for T3 dissolution served as control (n = 9). Left ventricular function was assessed from peak developed pressure at baseline and after T3 administration. Triiodothyronine had no effect in normal hearts on peak developed pressure or end-diastolic pressure. In 18 rabbits, the acute effect of T3 administration after ischemia was investigated. Preischemic left ventricular function was measured to serve as baseline, and hearts were subjected to 37 degrees C global ischemia. Triiodothyronine (n = 9) or vehicle (n = 9) was infused during reperfusion, and left ventricular peak developed pressure was measured at 30 and 60 minutes of reperfusion. Recovery of function (expressed as percent return of left ventricular peak developed pressure) was significantly improved within 15 minutes of reperfusion (65.0% +/- 2.1% versus 80.2% +/- 4.1%) and remained significantly improved throughout the reperfusion period (p less than 0.05 by analysis of variance). These data suggest that although T3 possesses no inotropic properties, it significantly improves postischemic left ventricular function. The rapidity of the functional improvement suggests that these effects may be due to plasma membrane-mediated mechanisms.
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364
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Ding M, Umetsu K, Yuasa I, Nakamura S, Choi WY, Suzuki T. Polymorphism of complement component I in Mongoloid populations: a new genetic variant IF A2. Hum Hered 1991; 41:206-8. [PMID: 1937494 DOI: 10.1159/000154002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The genetic polymorphism of the complement component I (IF) was investigated in 282 Chinese, 239 Koreans and 198 Japanese. The 3 common IF phenotypes (A, AB and B) and a new rare IF phenotype (BA2) were observed. The obtained allele frequencies are as follows: IF*A = 0.0993 and IF*B = 0.9007 in Chinese; IF*A = 0.0921 and IF*B = 0.9079 in Koreans; IF*A = 0.0985, IF*B = 0.8990 and IF*A2 = 0.0025 in Japanese. These 3 Mongoloid populations showed a much higher degree of IF polymorphism than Caucasian populations.
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365
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Ding M, Grebogi C, Ott E, Yorke JA. Transition to chaotic scattering. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1990; 42:7025-7040. [PMID: 9904016 DOI: 10.1103/physreva.42.7025] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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366
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Wu D, Xu W, Jiao R, Ding M, Zhai Z. [The relationship of Sindbis virus assembly and the viral protein 6K with intermediate filaments]. WEI SHENG WU XUE BAO = ACTA MICROBIOLOGICA SINICA 1990; 30:417-21. [PMID: 2270686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The relationship of Sindbis virus (Sbv) assembly with intermediate filaments was studied by means of whole-mount and DGD embedment-free technique of EM together with the procedure of gentle extraction. In the early stage of Sbv infection, the "virus assembly center" was suspended in the intermediate filament network. In the late stage, the assembling and assembled virus nucleocapsids were associated with intermediate filaments. It is presumable that the virus nucleocapsids may move from the "virus assembly center" to cytoplasmic membrane along the intermediate filaments. Further study using immunolabelling technique indicated that the nonstructural protein 6K of Sbv was probably associated with intermediate filaments as well.
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367
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Ding M. [EEG topographic study of Alzheimer's disease and multi-infarction dementia]. ZHONGHUA YI XUE ZA ZHI 1990; 70:434-7, 30. [PMID: 2174281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The results of topographic analyses of electroencephalographic data obtained from 28 patients with Alzheimer's disease, 29 with multi-infarction dementia and 31 with multiple infarction were compared with those of 30 healthy controls. Both demented groups demonstrated a significant increase in delta and theta power in all the regions. The AD group showed the most significant increase at the bilateral frontal regions. MID and MI groups demonstrated normal alpha power in all regions. But in AD, alpha power in most regions was decreased. The MID group had more asymmetric findings than the AD group.
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368
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Ding M. [Monitoring of percutaneous oxygen and carbon dioxide partial pressure]. ZHONGHUA HU LI ZA ZHI = CHINESE JOURNAL OF NURSING 1990; 25:192-3. [PMID: 2350829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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369
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Ding M, Lin W. [Analgesic anti-inflammatory effects of moschus bone-setting liquor in local traumatic ecchymosis]. ZHONGGUO ZHONG YAO ZA ZHI = ZHONGGUO ZHONGYAO ZAZHI = CHINA JOURNAL OF CHINESE MATERIA MEDICA 1990; 15:49-51, 65. [PMID: 2350429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Moschus Bone-setting liquor, ip, 1 ml/kg significantly decreases the rate and frequency of body twisting reaction induced by ip acetic acid, and markedly increases the pain threshold of thermal stimulation in mice. The liquor also reduces apparently the inflammation of mice ear induced by the oil of Fructus Crotonis, and rapidly relieves the traumatic ecchymosis in guinea pigs. Dose response relationship was obtained in the experiment. These results provide evidences for the clinical application of Moschus Bone-setting liquor in the treatment of many traumatic diseases.
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370
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Ding M, Umetsu K, Nakayashiki N, Choi WY, Jia J, Suzuki T. Distribution of human Zn-alpha-2-glycoprotein types in Chinese and Korean populations. Hum Hered 1990; 40:311-2. [PMID: 2265857 DOI: 10.1159/000153952] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The genetic variation in Zn-alpha 2-glycoprotein (ZAG) was investigated by polyacrylamide gel isoelectric focusing and immunoblotting. The samples comprised 590 Chinese from 2 localities (Shenyang: n = 390; Kaohsiung: n = 200) and 873 Koreans from 2 localities (Seoul: n = 523; Cheju: n = 350). The allele frequencies were: ZAG*1 = 0.9962, ZAG*5 = 0.0038 in Shenyang; ZAG*1 = 1.0000 in Kaohsiung; ZAG*1 = 0.9971, ZAG*3 = 0.0029 in Seoul, and ZAG*1 = 0.9929, ZAG*3 = 0.0071 in Cheju.
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371
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Ding M, Grebogi C, Ott E. Evolution of attractors in quasiperiodically forced systems: From quasiperiodic to strange nonchaotic to chaotic. PHYSICAL REVIEW. A, GENERAL PHYSICS 1989; 39:2593-2598. [PMID: 9901530 DOI: 10.1103/physreva.39.2593] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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372
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Burstein NL, Ding M, Pratt MV. Intraocular lens material evaluation by iris abrasion in vitro: a scanning electron microscope study. J Cataract Refract Surg 1988; 14:520-5. [PMID: 3183933 DOI: 10.1016/s0886-3350(88)80009-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Prosthetic posterior chamber intraocular lenses can abrade the iris pigmented epithelium, resulting in pigment dispersion, callus formation, and iris adhesions. To evaluate iris abrasion from intraocular lens materials, we developed an in vitro test and studied three materials: polymethylmethacrylate (PMMA), silicone, and PMMA surface-modified by covalent binding of a hydrophilic polymer (surface-modified PMMA). Each lens was rubbed 1,000 times on the posterior iris of pigmented rabbits using a total force of 0.5 gram. Scanning electron micrographs of the abraded irides were scored using a subjective, nonparametric numerical scale. Polymethyl-methacrylate lenses removed iris epithelium completely, exposing underlying connective tissue. Silicone lenses damaged an area longer and narrower than the PMMA lens and also exposed connective tissue. Surface-modified PMMA lenses caused only slight surface damage, including flattening or breaking of protruding suspensory ligaments. The test conditions used cannot precisely mimic prolonged lens implantation in living subjects. Nevertheless, the results indicate that iris-lens interaction may be reduced in vivo by using a surface-modified PMMA lens. This hypothesis should be further verified by animal implantation studies.
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373
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Pan JC, Zhang ZD, Yu LP, Wu AJ, Ding M, Jin GZ. [Potentiation of norepinephrine on rat acupuncture analgesia antagonized by an arcuate nucleus lesion or naloxone-blocked on opiate receptors in periaqueductal gray]. ZHONGGUO YAO LI XUE BAO = ACTA PHARMACOLOGICA SINICA 1988; 9:118-22. [PMID: 2847488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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374
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Abstract
Fibronectin is an extracellular structural protein with the unique ability to bind to both cells and collagen. It plays a major role in the development of the cornea. The universal appearance of fibronectin within 8 hours of corneal wounding has promoted major interest in its wound healing properties. The early clinical evidence for fibronectin treatment of recurrent corneal erosion and certain forms of keratitis sicca is strong. The current major problem preventing commercial use is the antigenic nature of fibronectin derived from separate species. Human pooled fibronectin has been suggested as a commercial source of this ubiquitously occurring protein.
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375
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Liu W, Ding M, Hsu M. New methods for synthesis of the colored Edman degradation reagent, 4-N,N-dimethylaminoazobenzene-4'-isothiocyanate. Anal Biochem 1982; 127:426-7. [PMID: 6819786 DOI: 10.1016/0003-2697(82)90197-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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376
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Zhai Z, Ding M. Cytoplasmic origin of an intranuclear DNA virus (duck plague virus). SCIENTIA SINICA. SERIES B, CHEMICAL, BIOLOGICAL, AGRICULTURAL, MEDICAL & EARTH SCIENCES 1982; 25:36-45. [PMID: 7201675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Electron microscopic and autoradiographic studies have revealed that the assembly and maturation of duck plague virus (DPV, an intranuclear DNA virus) occur both in the nucleus and in the cytoplasm. A dense cytoplasmic matrix (tentatively called viroplast) is the basic organelle in which the assembly of nucleocapsids occurs. At the early stage of virion maturation, dense particles, approximately 40 nm in size, appear and become assembled nucleocapsid structures later on. As capsids become mature, they obtain a diameter of 95-105 nm. The viroplast matrix gradually decreases in size, and a loose structure appears inside as the nucleocapsids increase in number. When viroplast has almost disappeared, nucleocapsids become abundant, regularly arranged around the cytoplasmic vacuoles. They bud into these vacuoles, thereby acquiring their envelopes. These nucleocapsids differ from those found in the nucleus both in morphology and in distribution. Electron microscopic autoradiography has shown that there is a huge amount of DNA in viroplast. DNA for the assembly of the nucleocapsids in the cytoplasm is derived from the very viroplast.
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