8351
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Yin SN, Li Q, Liu Y, Tian F, Du C, Jin C. Occupational exposure to benzene in China. BRITISH JOURNAL OF INDUSTRIAL MEDICINE 1987; 44:192-5. [PMID: 3828244 PMCID: PMC1007803 DOI: 10.1136/oem.44.3.192] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Of a total of 528,729 workers exposed to benzene or benzene mixtures in China, 508,818 (96.23%) were examined. Altogether 2,676 cases of benzene poisoning were found, a prevalence of 0.15%. A higher prevalence of benzene poisoning was found in the cities of Hangjou, Hefei, Nanjing, Shenyang, and Xian. The geometric mean concentration of benzene in 50,255 workplaces was 18.1 mg/m3 but 64.6% of the workplaces had less than 40 mg/m3. There was a positive correlation between the prevalence of benzene poisoning and the concentration in shoemaking factories. The prevalence of benzene induced aplastic anaemia in shoemakers was about 5.8 times that occurring in the general population. The results of this investigation show the need for a practicable hygiene standard to prevent benzene poisoning.
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8352
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Liu Y. [Preliminary study of 12 biochemical components in amnionic fluid of normal pregnancy]. ZHONGHUA FU CHAN KE ZA ZHI 1987; 22:75-8, 125. [PMID: 3622073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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8353
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Jen PC, Liu Y. Hemoglobin Guangzhou, alpha 64(E13)Asp----Gly, a new abnormal hemoglobin found in Guangzhou, China. Hemoglobin 1987; 11:25-30. [PMID: 3454663 DOI: 10.3109/03630268709036577] [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: 01/05/2023]
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8354
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Liu Y, Zhang Q, Tittel FK, Curl RF, Smalley RE. Photodetachment and photofragmentation studies of semiconductor cluster anions. J Chem Phys 1986. [DOI: 10.1063/1.451332] [Citation(s) in RCA: 214] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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8355
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Henderson G, Liu Y, Guan X, Liu Z. The rise of technology in Chinese hospitals. Int J Technol Assess Health Care 1986; 3:253-63. [PMID: 10284923 DOI: 10.1017/s0266462300000544] [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: 11/06/2022]
Abstract
Chinese hospitals in the 1980s are in the midst of a technological revolution. Based upon data from several regions in China, this paper describes the political, organizational, economic, and philosophical changes which have accompanied the shift in focus from primary care medicine to high technology tertiary care. The increased authority of physicians, greater contact with the West, and increased funding for medical equipment are key factors in these changes. Although the Chinese state continues to control the administration and financing of most hospitals, the decentralizing reforms of Deng Xiaoping have undermined its ability to effectively plan for, and assess new technology. At present, limited resources prevent most regions from excessive technology acquisition, but the state must rebuild its planning capacity in order to foster rational allocation of scarce medical resources.
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8356
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Wang ZP, Liu Y. [Coordination of the redressment of the single cardioventricle]. ZHONGHUA HU LI ZA ZHI = CHINESE JOURNAL OF NURSING 1986; 21:350-1. [PMID: 3643823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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8357
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Liu Y, Chao KA. dc conductivity in one-dimensional incommensurate systems. PHYSICAL REVIEW. B, CONDENSED MATTER 1986; 34:5247-5252. [PMID: 9940355 DOI: 10.1103/physrevb.34.5247] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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8358
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Liu Y. [Clinical observation on human chorionic gonadotrophin in maternal serum and amniotic fluid using monoclonal antibody immunoenzyme assay]. ZHONGHUA FU CHAN KE ZA ZHI 1986; 21:257-60, 317. [PMID: 3545711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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8359
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Qian SS, Gao J, Wang JX, Cai YY, Liu Y, Li BG, Dong HY. [Establishment and biologic properties of a mouse uterine cervix cancer cell line (MUCC) with lymphatic and hematogenous metastatic capacities]. ZHONGHUA ZHONG LIU ZA ZHI [CHINESE JOURNAL OF ONCOLOGY] 1986; 8:324-7. [PMID: 3568983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
For study of tumor metastatic mechanism, a mouse uterine cervix cancer cell line (MUCC), as derived from a transplantable mouse uterine cervix cancer No. 27 (U 27) with metastatic capacities through lymphatics and blood, was established in vitro. It has been successfully maintained for more than 24 months through more than 100 passages. MUCC cells are epithelioid with definite malignant morphological features. The doubling time of the cell population is 27.8 hours. The average mitotic index is 30.6%, with a maximum of 58.9%. Chromosomes show aberration in number and structure. The homotransplant rate is 75% (9/12). The solid tumor, produced by homotransplant, is similar to the tumor U 27. Metastases are present in the lymph nodes and lungs in these 9 animal models. It is evident that this cell line retains the capacity of inducing daughter tumor lines with spontaneous lymphatic and blood metastases. MUCC cell line might be very useful in isolating subpopulations which possess the different metastatic abilities and the study of metastatic mechanism.
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8360
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8361
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Liu Y, O'Brien S, Zhang Q, Heath J, Tittel F, Curl R, Kroto H, Smalley R. Negative carbon cluster ion beams: New evidence for the special nature of C60. Chem Phys Lett 1986. [DOI: 10.1016/s0009-2614(86)80042-2] [Citation(s) in RCA: 72] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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8362
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O’Brien SC, Liu Y, Zhang Q, Heath JR, Tittel FK, Curl RF, Smalley RE. Supersonic cluster beams of III–V semiconductors: GaxAsy. J Chem Phys 1986. [DOI: 10.1063/1.450069] [Citation(s) in RCA: 241] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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8363
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Liu Y, Chao KA. Electronic states in coupled random chains. PHYSICAL REVIEW. B, CONDENSED MATTER 1986; 33:1010-1014. [PMID: 9938362 DOI: 10.1103/physrevb.33.1010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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8364
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Liu Y, Tai HH. Inactivation of pulmonary NAD+-dependent 15-hydroxyprostaglandin dehydrogenase by acrolein. Biochem Pharmacol 1985; 34:4275-8. [PMID: 4074386 DOI: 10.1016/0006-2952(85)90284-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Acrolein, a highly reactive aldehyde found in cigarette smoke, was shown to induce time-dependent inactivation of NAD+-linked 15-hydroxyprostaglandin dehydrogenase from porcine lung. The inactivation process followed pseudo-first-order kinetics and was irreversible. Inactivation by acrolein can be prevented by prior incubation of the enzyme with GSH but not by subsequent addition of GSH during assay. Inactivation can be also protected fully by prior incubation of the enzyme with NAD+, but only partially with prostaglandin E1. The results suggest that acrolein alkylates the enzyme at the coenzyme binding site and inactivates the enzyme. Inactivation of pulmonary NAD+-linked 15-hydroxyprostaglandin dehydrogenase by acrolein may alter cellular and circulating thromboxane/prostacyclin ratios and subsequently disturb vascular homeostasis and augment inflammatory and anaphylactic responses in smokers.
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8365
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Liu JS, Liu Y, Chin YC. [Preparation and assay of calmodulin]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1985; 7:453-8. [PMID: 3011297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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8366
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Li SS, Li SE, Liu Y, Wang MS. [Extraction of rat liver chromatin peptides and their effect on DNA transcription]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1985; 7:285-8. [PMID: 2939990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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8367
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Zhao NK, Du WX, Liu XM, Li XL, Gao FM, Ji XJ, Zhang FR, Liu Y, Li K. Establishment of a model of transplantable myelocytic leukemia (L801) in LACA mice. SCIENTIA SINICA. SERIES B, CHEMICAL, BIOLOGICAL, AGRICULTURAL, MEDICAL & EARTH SCIENCES 1985; 28:736-44. [PMID: 3869346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A transplantable myelocytic leukemia model of LACA mice, designated by the name of L801, was established by intravenous injection of spleen cell suspension from mice with radiation-induced myelocytic leukemia into mice of the same strain. Until now, for more than three years, the L801 has maintained stable and rapid growth and has been reproduced for over 130 serial passages. The incidence of leukemia in inoculated animals was approximately 100% and mean survival time was 10.9 +/- 2.1 days. The L801 is of myelocytic type which has been determined by cytological, cytochemical, pathological and ultrastructural observations. Its karyotype was hypodiploid, characterized by modal number of 39, loss of Y chromosome and an abnormal huge marker chromosome. The cell cycle duration of the L801 was 16 h. C-type viral particles were observed under the electron-microscope. The L801 was sensitive, to varying extents, to various anti-tumor agents. We presume that the L801 is a useful tool in studies on mechanism of leukemogenesis, anti-tumor agent screening and treatment of experimental tumors.
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8368
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Liu Y, Hoffman NE, Yang SF. Ethylene-promoted malonylation of 1-aminocyclopropane-1-carboxylic acid participates in autoinhibition of ethylene synthesis in grapefruit flavedo discs. PLANTA 1985; 164:565-568. [PMID: 24248233 DOI: 10.1007/bf00395976] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/1984] [Accepted: 12/28/1984] [Indexed: 06/02/2023]
Abstract
The increase in ethylene formation and in 1-aminocyclopropane-1-carboxylic acid (ACC) content in flavedo tissue of grapefruit (Citrus paradisi Macfad. cv. Ruby Red) in response to excision was markedly inhibited by exogenous ethylene. Ethylene treatment inhibited the synthesis of ACC, but increased the tissue's capability to malonylate ACC to N-malonyl-ACC, resulting in further reduction in the endogenous ACC content. The development of extractable ACC-malonyl-transferase activity in the tissue was markedly promoted by treatment with exogenous ethylene. These results indicate that the autoinhibition of ethylene production in this tissue results not only from suppression of ACC synthesis, but also from promotion of ACC malonylation; both processes reduce the availability of ACC for ethylene synthesis.
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8369
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Da WM, Cao LX, Cao CP, Liu Y. Colony growth and granulopoietic effects of human bone marrow fibroblast colony-forming cells in vitro. Chin Med J (Engl) 1985; 98:433-8. [PMID: 3932003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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8370
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Liu Y, Yoden K, Shen RF, Tai HH. 12-L-hydroxy-5,8,10-heptadecatrienoic acid (HHT) is an excellent substrate for NAD+-dependent 15-hydroxyprostaglandin dehydrogenase. Biochem Biophys Res Commun 1985; 129:268-74. [PMID: 4004878 DOI: 10.1016/0006-291x(85)91432-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
12-L-hydroxy-5,8,10-heptadecatrienoic acid (HHT) was found to be an excellent substrate for NAD+ dependent 15-hydroxyprostaglandin dehydrogenase from porcine kidney. Kcat/Km value of HHT was comparable to that of prostaglandin E although HHT is not a prostanoic acid derivative. Product of enzyme catalyzed oxidation of HHT was identified as 12-keto-5,8,10-heptadecatrienoic acid by gas chromatography-mass spectrometry. The fact that HHT is an excellent substrate for 15-hydroxyprostaglandin dehydrogenase suggest that HHT may have profound unrecognized biological actions and its inactivation may be via oxidation of the hydroxyl group.
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8371
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Liu BH, Jiang XY, Liu Y, Zhang JP, Zhu GR, Zou LF, Zhang XX, Luo CS. A method of screening for suspected ectopic pregnancy. Chin Med J (Engl) 1985; 98:358-61. [PMID: 3926410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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8372
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Liu Y, Su LY, Yang SF. Ethylene Promotes the Capability To Malonylate 1-Aminocyclopropane-1-carboxylic Acid and d-Amino Acids in Preclimacteric Tomato Fruits. PLANT PHYSIOLOGY 1985; 77:891-5. [PMID: 16664157 PMCID: PMC1064626 DOI: 10.1104/pp.77.4.891] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
When whole unripe green tomato fruits (Lycopersicon esculentum Mill, cv T(3)) were treated with ethylene (10 microliters per liter) for 18 hours, the fruit's ability to convert 1-aminocyclopropane-1-carboxylic acid (ACC) to N-malonyl-ACC (MACC) increased markedly and such an effect was also observed in fruits of mutant nor, which cannot ripen normally. The promotion of the capability to malonylate ACC by ethylene increased with the increasing ethylene concentration from 0.1 to 100 microliters per liter and with increasing duration of ethylene treatment up to 8 hours; a longer duration of ethylene treatment did not further increase the malonylation capability. When ethylene was withdrawn, the promotion disappeared within 72 hours. Norbornadiene, a competitive inhibitor of ethylene action, effectively eliminated the promotive effect of ethylene. Ethylene treatment also promoted the fruits' capability to conjugate d-amino acids and alpha-amino-isobutyric acid. Since the increase in the tissue's capability to malonylate ACC was accompanied by an increase in the extractable activity of ACC and d-amino acid malonyltransferase, ethylene is thought to promote the development of ACC/d-amino acid malonyltransferase in unripe tomato fruits.
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8373
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Ji XJ, Zhang FR, Liu Y, Gu QM. [Studies on the antineoplastic action of N-methylisoindigotin]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1985; 20:247-51. [PMID: 4072694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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8374
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Liu Y, Hoffman NE, Yang SF. Promotion by Ethylene of the Capability to Convert 1-Aminocyclopropane-1-carboxylic Acid to Ethylene in Preclimacteric Tomato and Cantaloupe Fruits. PLANT PHYSIOLOGY 1985; 77:407-11. [PMID: 16664067 PMCID: PMC1064528 DOI: 10.1104/pp.77.2.407] [Citation(s) in RCA: 36] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
The intact fruits of preclimacteric tomato (Lycopersicon esculentum Mill) or cantaloupe (Cucumis melo L.) produced very little ethylene and had low capability of converting 1-aminocyclopropane-1-carboxylic acid (ACC) to ethylene. When these unripe tomato or cantaloupe fruits were treated with ethylene for 16 hours there was no increase in ACC content or in ethylene production rate, but the tissue's capability to convert ACC to ethylene increased markedly. Such an effect was also observed in fruits of tomato mutants rin and nor, which do not undergo ripening and the climacteric increase in ethylene production during the senescence. The development of this ethylene-forming capability induced by ethylene increased with increasing ethylene concentration (from 0.1 to 100 microliters per liter) and duration (1 to 24 hours); when ethylene was removed this capability remained high for sometime (more than 24 hours). Norbornadiene, a competitive inhibitor of ethylene action, effectively eliminated the promotive effect of ethylene in tomato fruit. These data indicate that the development of the capability to convert ACC to ethylene in preclimacteric tomato and cantaloupe fruits are sensitive to ethylene treatment and that when these fruits are exposed to exogenous ethylene, the increase in ethylene-forming enzyme precedes the increase in ACC synthase.
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8375
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Uchida T, Ju S, Fay A, Liu Y, Dorf ME. Functional analysis of macrophage hybridomas. I. Production and initial characterization. THE JOURNAL OF IMMUNOLOGY 1985. [DOI: 10.4049/jimmunol.134.2.772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
A series of macrophage hybridomas were generated by fusion of splenic adherent cells with P388D1 tumor cells. Forty-two cell lines were established, and each was cloned by limiting dilution. Six clones that exemplified the spectrum of macrophage heterogeneity were selected for further analysis. Qualitative and quantitative differences in phenotype and functional activity were noted. Some clones constitutively expressed Ia antigens, whereas others only expressed detectable levels of Ia after lymphokine activation. The level of antigen-presenting activity generally correlated with the level of Ia expression. Furthermore, interclonal differences were noted in the levels of receptor-mediated phagocytosis and IL 1 secretion. Generally, the hybridoma clones maintained stable phenotypic and functional properties during approximately 1 yr of continuous in vitro culture. These cloned hybridoma cell lines represent a useful resource to analyze macrophage biology and to dissect structure and function relationships.
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8376
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Uchida T, Ju S, Fay A, Liu Y, Dorf ME. Functional analysis of macrophage hybridomas. I. Production and initial characterization. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 1985; 134:772-8. [PMID: 3155541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A series of macrophage hybridomas were generated by fusion of splenic adherent cells with P388D1 tumor cells. Forty-two cell lines were established, and each was cloned by limiting dilution. Six clones that exemplified the spectrum of macrophage heterogeneity were selected for further analysis. Qualitative and quantitative differences in phenotype and functional activity were noted. Some clones constitutively expressed Ia antigens, whereas others only expressed detectable levels of Ia after lymphokine activation. The level of antigen-presenting activity generally correlated with the level of Ia expression. Furthermore, interclonal differences were noted in the levels of receptor-mediated phagocytosis and IL 1 secretion. Generally, the hybridoma clones maintained stable phenotypic and functional properties during approximately 1 yr of continuous in vitro culture. These cloned hybridoma cell lines represent a useful resource to analyze macrophage biology and to dissect structure and function relationships.
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8377
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Li SE, Li SS, Fan MZ, Huang L, Zhu XK, Liu Y, Wang MS. [Effects of diamines and their derivatives on ornithine decarboxylase activity in mouse sarcoma 180 in vivo]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1984; 6:405-9. [PMID: 6242540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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8378
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Liu Y, Su LY, Yang SF. Stereoselectivity of 1-aminocyclopropanecarboxylate malonyltransferase toward stereoisomers of 1-amino-2-ethylcyclopropanecarboxylic acid. Arch Biochem Biophys 1984; 235:319-25. [PMID: 6517594 DOI: 10.1016/0003-9861(84)90204-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
A malonyltransferase isolated from mungbean (Vigna radiata L.) hypocotyls catalyzed the malonylation of both 1-aminocyclopropane-1-carboxylic acid (ACC) and D-amino acids. The possibility that ACC was recognized by the enzyme as a D-amino acid was investigated by examining the efficiencies of the four stereoisomers of 1-amino-2-ethylcyclopropane-1-carboxylic acid (AEC) serving as substrates of malonyltransferase and as inhibitors of ACC malonyltransferase. Although all four isomers were malonylated by the enzyme and competitively inhibited the malonylation of ACC to N-malonyl-ACC, (1R,2S)-AEC and (1R,2R)-AEC, both of which have an R-configuration as a D-amino acid, had lower Km and Ki values (0.1 to 0.2 mM) than their enantiomers, (1S,2R)-AEC (Km and Ki values were about 1 mM) and (1S,2S)-AEC (Km and Ki values were higher than 10 mM), which have an S-configuration as an L-amino acid. Similarly, (R)-isovaline (2-amino-2-methylbutanoic acid), which has an R-configuration as a D-amino acid, inhibited more effectively the enzymatic conversion of ACC to malonyl-ACC than did (S)-isovaline, which has an S-configuration as an L-amino acid. In mungbean hypocotyls (1R,2S)-AEC and (1R,2R)-AEC were also more efficiently converted into malonyl conjugates and more efficiently inhibited the conversion of radioactive ACC into malonyl-ACC than their enantiomers, although the differences in efficiency among stereoisomers were smaller in hypocotyls than in enzymatic reactions. These results suggest that ACC is recognized by the enzyme as a D-amino acid.
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8379
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Liu Y, Su LY, Yang SF. Metabolism of α-aminoisobutyric acid in mungbean hypocotyls in relation to metabolism of 1-aminocyclopropane-1-carboxylic acid. PLANTA 1984; 161:439-443. [PMID: 24253844 DOI: 10.1007/bf00394575] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/1983] [Accepted: 03/15/1984] [Indexed: 06/02/2023]
Abstract
1-Aminocyclopropane-1-carboxylic acid (ACC) is known to be converted to ethylene and conjugated into N-malonyl-ACC in plant tissues. When α-amino[1-(14)C]isobutyric acid (AIB), a structural analog of ACC, was administered to mungbean (Vigna radiata L.) hypocotyl segments, it was metabolized to (14)CO2 and conjugated to N-malonyl-AIB (MAIB). α-Aminoisobutyric acid inhibited the conversion of ACC to ethylene and also inhibited, to a lesser extent, N-malonylation of ACC and D-amino acids. Although the malonylation of AIB was strongly inhibited by ACC as well as by D-amino acids, the metabolism of AIB to CO2 was inhibited only by ACC but not by D-amino acids. Inhibitors of ACC conversion to ethylene such as anaerobiosis, 2,4-dinitrophenol and Co(2+), similarly inhibited the conversion of AIB to CO2. These results indicate that the malonyalation of AIB to MAIB is intimately related to the malonylation of ACC and D-amino acids, whereas oxidative decarboxylation of AIB is related to the oxidative degradation of ACC to ethylene.
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8380
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Zhang JB, Cai YY, Lu CH, Liu Y, Xu CL, Yuan J. [Preliminary observation on induction of chromosome aberrations and SCE of human peripheral lymphocytes in vitro with microwave]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1984; 6:147-9. [PMID: 6242367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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8381
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Zhang JB, Lu CH, Liu Y, Yuan J, Zou YH. [Preliminary observation on killing effect of microwave on human and murine cancerous or normal cells in vitro]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1984; 6:32-4. [PMID: 6238692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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8382
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He YJ, Zhang L, Liu Y, Chen HY, Lu RK, Li J, Zhang QT, Min QC, Xu ZQ. [Endocrine changes in 28 young patients with schistosomiasis dwarfism]. JI SHENG CHONG XUE YU JI SHENG CHONG BING ZA ZHI = JOURNAL OF PARASITOLOGY & PARASITIC DISEASES 1984; 2:150-153. [PMID: 6391724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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8383
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Griesemer EC, Liu Y, Budd RD, Raftogianis L, Noguchi TT. The determination of cocaine and its major metabolite, benzoylecgonine, in postmortem fluids and tissues by computerized gas chromatography/mass spectrometry. J Forensic Sci 1983; 28:894-900. [PMID: 6631370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
An analytical procedure for the simultaneous determination of both cocaine and benzoylecgonine in postmortem fluid and tissue samples has been developed by using computerized gas chromatography/mass spectrometry and gas chromatography using a nitrogen/phosphorus (N/P) detector. Both methods are accurate and sensitive and allow the determination of tissue concentrations of cocaine and benzoylecgonine as low as 0.015 microgram/mL.
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8384
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Liu Y, Griesemer EC, Budd RD, Noguchi TT. Determination of lidocaine in postmortem fluids and tissues. J Chromatogr A 1983; 268:329-35. [PMID: 6643589 DOI: 10.1016/s0021-9673(01)95425-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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8385
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Liu Y, Hoffman NE, Yang SF. Relationship between the malonylation of 1-aminocyclopropane-1-carboxylic acid and D-amino acids in mung-bean hypocotyls. PLANTA 1983; 158:437-41. [PMID: 24264853 DOI: 10.1007/bf00397737] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/1983] [Accepted: 03/30/1983] [Indexed: 05/08/2023]
Abstract
In sections from hypocotyls of dark-grown mung-bean (Vigna radiata L.) seedlings, D-phenylalanine and D-methionine (D-met) inhibited the formation of 1-(malonylamino)cyclopropane-1-carboxylic acid from exogenously administered 1-aminocyclopropane-1-carboxylic acid (ACC), resulting in an increase in free ACC content and stimulation of ethylene production, whereas their L-enantiomers had little or no such effect. When the hypocotyls were administered D-Met, it was mainly metabolized to N-malonylmethionine and N-malonylmethionine sulfoxide, and this malonylation process was inhibited to a greater extent by ACC and D-amino acids (phenylalanine and serine) than by L-amino acids. These results indicate that malonylation of D-amino acids and of ACC are intimately interrelated.
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8386
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Liu Y, Cui JR, Lin XH, Gu Y. Preliminary observations on thyroxin, insulin and cortisol reactions following trauma. Chin Med J (Engl) 1983; 96:634-7. [PMID: 6416764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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8387
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Cai YY, Xu CL, Li SH, Liu Y. [Sister chromatid exchange induced by antitumor and antiparasitic drugs before and after activation by microsomal enzyme S-9]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1983; 5:161-4. [PMID: 6226411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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8388
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Xue SP, Liang DC, Fei RR, Chen XM, Ye SJ, Liu Y, Wu YW, You MM, Guo XY. Subcellular site of antispermatogenic effect of gossypol and its possible molecular mechanism of action. SCIENTIA SINICA. SERIES B, CHEMICAL, BIOLOGICAL, AGRICULTURAL, MEDICAL & EARTH SCIENCES 1983; 26:614-33. [PMID: 6623054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
This paper reports the results of gossypol effects on the testicular mitochondrial ultrastructures and functions. A hypothesis of mechanism of gossypol action based on our experimental data was postulated. Electron microscopic observations confirmed further our previous studies that the mitochondria of the target germ cells were the most sensitive and the most severely damaged among cellular organelles in response to gossypol. The damages included the swelling, vacuolation, crista depletion, lysis, granular accumulation in matrix and the process of intact mitochondria disintegration. The activity of the mitochondrial marker enzyme, the LDH-X of human spermatozoa, was markedly decreased or suppressed completely after gossypol treatment. The functions of isolated testicular mitochondria determined by Warburg manometric and oxygen electrode polarographic methods indicated that gossypol stimulated respiration but inhibited slightly the oxidative phosphorylation at low concentrations (20-40 microM) in vitro. With the increase in concentration of gossypol, the mitochondrial respiration and phosphorylation decreased obviously, they were completely inhibited at a concentration of 80 microM for oxidative phosphorylation and at about 300 microM for respiration. The degree of uncoupling of phosphorylation appears to be dose-dependent. Similar results were obtained for the testicular mitochondria isolated from rats that had been administered per os gossypol previously (6 mg, 10 mg and 15 mg/day X 21 respectively), in which the P/0 ratio decreased significantly (P less than 0.001) as compared with that of the control group. The distribution of 14C-gossypol in mitochondrial was found to be 2-3 times higher than that in other subcellular fractions. Similar pattern of distribution was shown in double labeling experiments with 14C-gossypol and 3H-ouabain.
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8389
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Hoffman NE, Liu Y, Yang SF. Changes in 1-(malonylamino)cyclopropane-1-carboxylic acid content in wilted wheat leaves in relation to their ethylene production rates and 1-aminocyclopropane-1-carboxylic acid content. PLANTA 1983; 157:518-523. [PMID: 24264416 DOI: 10.1007/bf00396882] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/1982] [Accepted: 12/15/1982] [Indexed: 06/02/2023]
Abstract
In excised wheat (Triticum aestivum L.) leaves, water-deficit stress resulted in a rapid increase, followed by a decrease, in ethylene production rates and in the levels of 1-aminocyclopropane-1-carboxylic acid (ACC), the immediate precursor of ethylene. However, the level of N-malonyl-ACC (MACC), the major metabolite of ACC, increased gradually, then leveled off. This increase in MACC was much greater than the decrease in ACC level. The MACC levels were positively correlated with severity of water stress. Once established, the MACC levels did not decrease even after the stressed tissues were rehydrated. Administration of labeled ACC and MACC showed that the conjugation of ACC to MACC was essentially irreversible. Repeated wilting treatments following the first wilting and rehydration cycle resulted in no further increase in ethylene production and in the levels of ACC and MACC. However, when benzyladenine was supplied during the preceding rehydration process, subsequent wilting treatment resulted in a rise in MACC level and a rapid rise followed by a decline in ethylene production rates and in the level of ACC. The magnitude of these increases was, however, smaller in these rewilted tissues than that observed in the first wilting treatment. Since MACC accumulates with water stress and is not appreciably metabolized, the MACC level is a good indicator of the stress history in the detached leaves used.
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8390
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Li G, Gao X, Zhang C, Liao Z, Lin Z, Yue S, Liu Y. [Microscopic observation of the adherence of Streptococcus mutans]. SICHUAN YI XUE YUAN XUE BAO = ACTA ACADEMIAE MEDICINAE SICHUAN 1983; 14:57-61. [PMID: 6573028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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8391
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Yin WB, Zhang L, Miao Y, Yu Z, Zhang Z, Zhueng C, Wang M, Li G, Liu Y, Jia Y, Ku X. The results of high-energy electron therapy in carcinoma of the oesophagus compared with telecobalt therapy. Clin Radiol 1983; 34:113-6. [PMID: 6401610 DOI: 10.1016/s0009-9260(83)80403-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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8392
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Feng CY, Hu YM, Liu Y, Kuang MS, Wang XX, Ren HX, Liu LZ, Yang Y, Deng BZ. [Effects of nitroquine on sporogenic cycle of Plasmodium cynomolgi]. ZHONGGUO YAO LI XUE BAO = ACTA PHARMACOLOGICA SINICA 1982; 3:273-6. [PMID: 6219546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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8393
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Ji XJ, Liu Y, Lin H, Liu ZM. [Metabolism of homoharringtonine in rats and mice]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1982; 17:881-8. [PMID: 7183119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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8394
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Liu Y, Budd RD, Griesemer EC. Study of the stability of cocaine and benzoylecgonine, its major metabolite, in blood samples. J Chromatogr A 1982; 248:318-20. [PMID: 7174764 DOI: 10.1016/s0021-9673(00)87285-4] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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8395
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Budd RD, Liu Y. Phencyclidine concentrations in postmortem body fluids and tissues. JOURNAL OF TOXICOLOGY. CLINICAL TOXICOLOGY 1982; 19:843-50. [PMID: 7182512 DOI: 10.3109/15563658208992517] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Phencyclidine (PCP) concentrations have been studied in the blood and tissues of Los Angeles County victims whose deaths were related to PCP use. In most cases PCP blood concentrations ranged from 0.01 to 0.9 micrograms/mL while higher concentrations were found in the liver, urine, bile, brain, and kidney.
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8396
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Jiang B, Liu Y. An analysis on the equivalence of the eye to a system with aberration. SCIENTIA SINICA. SERIES B, CHEMICAL, BIOLOGICAL, AGRICULTURAL, MEDICAL & EARTH SCIENCES 1982; 25:970-980. [PMID: 7146874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Computed transfer functions for epsilon = 0.60 and 0.75 annular pupils of 2.67 mm o.d. show that absorption of the average spherical aberration of the eye is still incomplete but if the eye is so designed as to adjust its focal plane in order to achieve a best Strehl ratio, it would show a transfer function approaching that of a diffraction limited system, i.e. the optical defect of the eye is overcompensated. However, it is argued that a varying amount of focusing adjustment of the eye is needed in order to account for the transfer function of the eye of different pupil sizes, though not always to the extent of achieving a best Strehl ratio. Such a property of the eye is referred to variously as the antidefocusing, deblurring or contrast constancy phenomenon and, when operationally defined, this is equivalent to saying that the eye has a greater depth of focus than that defined for a physical system based upon a fixed demodulation criterion. The significance of the physiological depth of the eye is discussed.
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8397
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Liu Y, Gong GL. Clinical observation of amniotic fluid creatinine as an index of fetal maturity. Chin Med J (Engl) 1982; 95:697-702. [PMID: 6817997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
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8398
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Liu Y. [The method of measuring probability of the annual fertility]. REN KOU YAN JIU = RENKOU YANJIU 1982:52-4, 58. [PMID: 12159362] [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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8399
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Liu Y. [For controlling population growth more scientifically]. REN KOU YAN JIU = RENKOU YANJIU 1982:18-21, 62. [PMID: 12265438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
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8400
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Liu Y. [Preliminary observation on the secretion of thyroxine and insulin following trauma]. ZHONGHUA WAI KE ZA ZHI [CHINESE JOURNAL OF SURGERY] 1982; 20:403-5. [PMID: 6756825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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