601
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Zhu C. Avoiding interference in manufacturing a free-formed surface with a cylindrical end milling cutter. COMPUT IND 1990. [DOI: 10.1016/0166-3615(90)90042-n] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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602
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Zhu C. A look at directions for the development of social security work for China's elderly from overseas trends. CHINESE JOURNAL OF POPULATION SCIENCE 1990; 2:269-76. [PMID: 12284990] [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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603
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Abstract
A meshwork of collagen over the apical region of the follicle must be breached to permit the ovum to escape. We propose that specific collagenase activity is responsible for collagen breakdown in this region. Immature rats are primed with pregnant mare serum gonadotropin (PMSG), followed at 48 h by hCG. At 8 h after hCG, collagenase activity, measured in extracts of ovarian tissue, is elevated about five-fold. Ovulation follows at 10-12 h. Ovaries from PMSG-primed rats are dissected at 48 h, placed in a perfusion apparatus, and perfused with luteinizing hormone and 3-isobutyl-1-methyl xanthine. The ovulations induced by this treatment can be blocked to the extent of 70% with a synthetic collagenase inhibitor. The activation of procollagenase is believed to involve plasminogen activator and plasmin. In support of this, we find that tranexamic acid at 1 mM inhibits ovulation about 70%. The inhibitor must be added within 3-4 h of LH to be effective. A specific plasmin inhibitor, D-Val-Phe-Lys-chloromethyl ketone, is similarly effective.
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604
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Zhu C. [Effect of naloxone on experimental head injury in cats]. ZHONGHUA WAI KE ZA ZHI [CHINESE JOURNAL OF SURGERY] 1989; 27:498-500, 511. [PMID: 2620609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Forty-five cats were randomly divided into four groups: (1) the control group (n = 11); (2) the head injury group (n = 17); (3) the naloxone group (n = 8); (4) the saline group (n = 9). Naloxone (10mg/kg) was directly injected into cisterna cerebello-medullaris 2 hours after injury. The results showed that naloxone had some effects in maintaining MABP, CPP, lowering of ICP and edema of brain).
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605
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Liou GI, Ma DP, Yang YW, Geng L, Zhu C, Baehr W. Human interstitial retinoid-binding protein. Gene structure and primary structure. J Biol Chem 1989; 264:8200-6. [PMID: 2542268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Interstitial retinoid-binding protein (IRBP) is synthesized and secreted by rod photoreceptor cells into the interphotoreceptor matrix and is known to bind retinoids and fatty acids. We have used cDNA clones encoding human IRBP to isolate a 15-kilobase genomic fragment that encompasses the complete human IRBP gene. The IRBP gene spans more than 11 kilobases and is interrupted by three introns, all of which are positioned near the 3'-end of the coding sequence. The 3741-base pair coding region of IRBP appears to have been generated by quadruplication of an approximately 900 base pair long ancestral gene. The deduced amino acid sequence predicts a mature protein of 1,230 residues (calculated molecular weight 133,000). The protein sequence can be aligned into four homologous segments, each consisting of about 300 residues. Sequence similarity between segments is as high as 60% when conservative substitutions are taken into account. Two putative N-linked glycosylation sites are located in highly conserved domains in the center of the first and second segment of IRBP. A domain consisting of 41 residues at the COOH-terminal end of the third segment has 15 matching residues (38%) with an intradiscal loop of rhodopsin, a retinal-binding protein in rod photoreceptors.
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606
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Liou GI, Ma DP, Yang YW, Geng L, Zhu C, Baehr W. Human interstitial retinoid-binding protein. J Biol Chem 1989. [DOI: 10.1016/s0021-9258(18)83169-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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607
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Jiang JY, Zhu C, Chen CC, Wang CH, Zhu YX, Lin BC. Beta-endorphin-like immunoreactivity in CSF of patients with acute head injury. A clinical report of 36 cases. Chin Med J (Engl) 1989; 102:137-9. [PMID: 2528443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
beta-endorphin-like immunoreactivity (beta-ELI) was measured in the cerebrospinal fluid (CSF) of 36 patients with acute head injury and 12 controls. The mean values of beta-ELI in CSF of controls and patients with moderate and severe acute head injury were 51.9 +/- 5.6 pg/ml, 110.5 pg/ml, and 173.8 +/- 20.1 pg/ml respectively, with significant difference between them (p less than 0.05). The results showed that beta-ELI increased in CSF of acute head injury patients.
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608
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Zhu C, Skalak R, Schmid-Schönbein GW. One-dimensional steady continuum model of retraction of pseudopod in leukocytes. J Biomech Eng 1989; 111:69-77. [PMID: 2747236 DOI: 10.1115/1.3168342] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A one-dimensional steady state continuum mechanics model of retraction of pseudopod in leukocytes is developed. The retracting pseudopod is assumed to move bodily toward the main cell body, the bulk motion of which can be represented by cytoplasmic flow within a typical stream tube through the leukocyte. The stream tube is approximated by a frictionless tube with prescribed geometry. The passive rheological properties of cytoplasm in the main cell body and in the pseudopod are modeled, respectively, by Maxwell fluid and Hookean solid. The two regions are assumed to be separated by a sharp interface at which actin gel solates and thereby changes its rheological properties as it flows from the pseudopod to the main cell body. The driving mechanism responsible for the active retraction motion is hypothesized to be a spontaneous deformation of the actin gel, analogous but not necessarily equal to the well known actin-myosin interaction. This results in an active contractile stress being developed in the pseudopod as well as in the cell cortex. The transverse traction pulls against the inclined wall of the stream tube and is transduced into an axial stress gradient, which in turn drives the flow. The tension on the tube wall is picked up by the prestressed cortical shell. Governing equations and boundary conditions are derived. A solution is obtained. Sample data are computed. Comparison of the theory with experiments shows that the model is compatible to the observations.
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609
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Zhu T, Zhu C, Ning L, Jiang KJ. [A preliminary study on pollinating bees for Amomum compactum Soland ex Maton]. ZHONGGUO ZHONG YAO ZA ZHI = ZHONGGUO ZHONGYAO ZAZHI = CHINA JOURNAL OF CHINESE MATERIA MEDICA 1989; 14:17-9, 62. [PMID: 2504187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
This article deals with the species of bees pollinating Amomum compactum, along with the laws governing their growth and decline, and the pollinating effect of Nomia and Ceratina in the field.
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610
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Zhu C. The necessity of female population studies. CHINESE JOURNAL OF POPULATION SCIENCE 1989; 1:477-82. [PMID: 12317003] [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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611
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Abstract
The morphology of human leukocytes, the biochemistry of actin polymerization, and the theory of continuum mechanics are used to model the pseudopod protrusion process of leukocytes. In the proposed model, the pseudopod is considered as a porous solid of F-actin network, the pores of which are full of aqueous solution. G-actin is considered as a "solute" transported by convection and diffusion in the fluid phase. The pseudopod grows as actin filaments elongate at their barbed ends at the tip of the pseudopod. The driving force of extension is hypothesized as being provided by the actin polymerization. It is assumed that elongation of actin filaments, powered by chemical energy liberated from the polymerization reaction, does mechanical work against opposing pressure on the membrane. This also gives rise to a pressure drop in the fluid phase at the tip of the pseudopod, which is formulated by an equation relating the work done by actin polymerization to the local state of pressure. The pressure gradient along the pseudopod drives the fluid filtration through the porous pseudopod according to Darcy's Law, which in turn brings more actin monomers to the growing tip. The main cell body serves as a reservoir of G-actin. A modified first-order equation is used to describe the kinetics of polymerization. The rate of pseudopod growth is modulated by regulatory proteins. A one-dimensional moving boundary problem based on the proposed mechanism has been constructed and approximate solutions have been obtained. Comparison of the solutions with experimental data shows that the model is compatible with available observations. The model is also applicable to growth of other cellular systems such as elongation of acrosomal process in sperm cells.
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612
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Liu XP, Zhu C, Sun JQ, Li FT, Gao JQ, Wu PL, Zhang L. [A new serotype of Salmonella]. WEI SHENG WU XUE BAO = ACTA MICROBIOLOGICA SINICA 1988; 28:68-73. [PMID: 3388829] [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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613
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Mathieu-Mahul D, Sigaux F, Zhu C, Bernheim A, Mauchauffe M, Daniel MT, Berger R, Larsen CJ. A t(8;14)(q24;q11) translocation in a T-cell leukemia (L1-ALL) with c-myc and TcR-alpha chain locus rearrangements. Int J Cancer 1986; 38:835-40. [PMID: 3466870 DOI: 10.1002/ijc.2910380609] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Cell lines established from T-cell leukemias have recently been reported to exhibit a chromosome translocation t(8;14) involving proto-oncogene c-myc and the gene of the T-cell receptor alpha-chain(TcR-alpha). In this work, we have studied a case of T-cell leukemia presenting a t(8;14)(q24;q11) translocation that was found in fresh leukemic cells taken during relapse, but was absent in cells collected at diagnosis. Hybridization analysis showed that the breakpoint on chromosome 8 was located 3' to the c-myc exon 3. A TcR-alpha-specific original probe (D14S7, Mathieu-Mahul et al., 1985) revealed two differently rearranged patterns in DNA from leukemic cells obtained at diagnosis and during relapse. In contrast, the rearranged TcR-beta-gene DNA pattern did not change during the course of the disease, indicating that leukemic cells were clonally related. These data indicate that the chromosome breakpoint in 14q11 is situated in the TcR-alpha locus. These results suggest that translocations t(8;14) involving TcR-alpha and c-myc genes in T-cell malignancies are analogous to variant t(2;8) and t(8;22) translocations observed in Burkitt lymphoma. They also establish that the same types of molecular rearrangements due to a t(8;14)(q24;q11) translocation, at first described in T-cell lines established in culture, also exist in vivo and may play a role in the evolution of the leukemic process.
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MESH Headings
- Child
- Chromosomes, Human, Pair 14
- Chromosomes, Human, Pair 8
- Female
- Humans
- Leukemia, Lymphoid/genetics
- Leukemia, Lymphoid/immunology
- Phenotype
- Proto-Oncogene Mas
- Proto-Oncogenes
- Receptors, Antigen, T-Cell/genetics
- Recombination, Genetic
- Translocation, Genetic
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614
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Zhu C, Lu YC, Zhang GJ. [Experimental studies and clinical observations on the arterial oxygenation in craniocerebral injuries]. ZHONGHUA WAI KE ZA ZHI [CHINESE JOURNAL OF SURGERY] 1985; 23:233-5, 255. [PMID: 3926421] [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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615
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Ruan L, Ren GF, Ruan WQ, Zhu C, Zhu JM. [Expression of HBsAg in mammalian cells by cotransformation]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1983; 5:269-74. [PMID: 6234076] [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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616
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Zhao L, Zhu C. [A preliminary inquiry about the problem of second births outside the plan]. REN KOU YAN JIU = RENKOU YANJIU 1983:36-9. [PMID: 12159371] [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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617
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Zhu C. [Multi-factor analysis in diagnosis of acute intracranial hematoma]. ZHONGHUA WAI KE ZA ZHI [CHINESE JOURNAL OF SURGERY] 1982; 20:539-43. [PMID: 7172909] [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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618
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Zhu C. [Extracranial-intracranial bypass and "trapping" method in the treatment of a giant aneurysm (author's transl)]. ZHONGHUA WAI KE ZA ZHI [CHINESE JOURNAL OF SURGERY] 1981; 19:596-7. [PMID: 7346044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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619
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Zhan MY, Liu CB, Li CM, Zhang WY, Zhu C, Pang QF, Zhao TX, Wang CA, Wang JL, Yu CY, Li SF, Tong ZG, Lin ZH, Niu JQ. [A preliminary study of hepatitis A virus in Chinese tupaia (author's transl)]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1981; 3:148-52. [PMID: 6274524] [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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