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Lu J, Weiss E, Zheng D, Rosu M, Hugo G, Venkat R, Gopalan S, Williamson J, Keall P. TH-D-BRC-07: Impact of Respiratory Biofeedback On Adaptively Sampled 4D-CBCT Image Quality: Initial Experiences. Med Phys 2009. [DOI: 10.1118/1.3182680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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152
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Pokhrel D, Lazos D, Murphy M, Lu J, Zheng D, Williamson J. SU-FF-T-08: Morphological Seed Identification and Removal of the Post-Implant Prostate Brachytherapy Patients in Cone-Beam CT Sinogram Projections. Med Phys 2009. [DOI: 10.1118/1.3181479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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153
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Zhang L, Lazos D, Zheng D, Pokhrel D, Williamson J. SU-FF-J-06: Off-Axis Variation of the Varian OBI Photon Spectrum and Impact On Cone-Beam CT Image Quality. Med Phys 2009. [DOI: 10.1118/1.3181298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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154
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Altunbas C, Zheng D, Weiss E, Williamson J. SU-FF-T-490: The Effect of Daily Cone Beam CT Imaging Dose On the Secondary Cancer Risk for Patients Receiving Prostate IMRT Treatments. Med Phys 2009. [DOI: 10.1118/1.3181988] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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155
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Zheng D, Lazos D, Lu J, Zhang L, Pokhrel D, Williamson J. TH-D-BRC-06: The Investigation and Correction of a Bowtie-Related Cone-Beam CT Circular Band Artifact. Med Phys 2009. [DOI: 10.1118/1.3182678] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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156
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Hochwald S, Nyberg C, Zheng M, Zheng D, Magis A, Ostrov D, Cance W, Golubovskaya V. 41: A Novel Small Molecule Inhibitor of FAK Decreases Growth of Human Pancreatic Cancer. J Surg Res 2009. [DOI: 10.1016/j.jss.2008.11.068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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157
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Xia J, Zheng D, Tang D, Dai H, Pan Q, Long Z, Liao X. Cloning, mapping and mutation analysis of human geneGJB5 encoding gap junction protein beta-5. Sci China C Life Sci 2008; 44:92-8. [PMID: 18763093 DOI: 10.1007/bf02882077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2000] [Indexed: 10/22/2022]
Abstract
By homologous EST searching and nested PCR a new human geneGJB5 encoding gap junction protein beta-5 was identified.GJB5 was genetically mapped to human chromosome 1p33-p35 by FISH. RT-PCR revealed that it was expressed in skin, placenta and fetal skin. DNA sequencing ofGJB5 was carried out in 142 patients with sensorineural hearing impairment and probands of 36 families with genetic diseases, including erythrokeratodermia (5 families), Charcot-Marie-Tooth disease (13), ptosis (4), and retinitis pigmentosa and deafness (14). Two missense mutations (686A-->G, H229R; 25C-->T, L9F) were detected in two sensorineural hearing impairment families. A heterologous deletion of 18 bp within intron was found in 3 families with heredity hearing impairment, and in one of the 3 families, a missense mutation (R265P) was identified also. But the deletion and missense mutation seemed not segregating with hearing impairment in the family. No abnormal mRNA or mRNA expression was detected in deletion carriers by RT-PCR analysis in skin tissue. Mutation analysis in 199 unaffected individuals revealed that two of them were carriers with the same 18 bp deletion.
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Affiliation(s)
- J Xia
- Hunan Medical University, State Key Laboratory of Medical Genetics, 410078, Changsha, China
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158
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Lee VWS, Wang YM, Wang YP, Zheng D, Polhill T, Cao Q, Wu H, Alexander IE, Alexander SI, Harris DCH. Regulatory immune cells in kidney disease. Am J Physiol Renal Physiol 2008; 295:F335-42. [DOI: 10.1152/ajprenal.00077.2008] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Lymphocytes and macrophages act as effector immune cells in the initiation and progression of renal injury. Recent data have shown that subpopulations of these immune cells (regulatory T lymphocytes and alternately-activated or regulatory macrophages) are potent modulators of tissue injury and repair in renal disease. Recent animal studies examining the therapeutic effect of these cells raise the exciting possibility that strategies targeting these cell types may be effective in treating and preventing kidney disease in humans. This review will describe their biological role in experimental kidney disease and therapeutic potential in clinical nephrology.
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159
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Zheng D, Lu J, Lazos D, Williamson J. TH-D-351-04: Cone Beam CT Beam Hardening and Scatter Preprocessing for Improved Image Quality in Image-Guided Adaptive Radiation Therapy. Med Phys 2008. [DOI: 10.1118/1.2962926] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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160
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Lu J, Zheng D, Keall P, Weiss E, Bartee C, Williamson J. TH-C-332-04: Comparison of Residual Motion Artifacts in Phase- and Amplitude-Binned Onboard 4D-CBCT Imaging. Med Phys 2008. [DOI: 10.1118/1.2962870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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161
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Zheng D, Lu J, Wu J, Weiss E, Dogan N, Williamson J. SU-EE-A3-05: A Protocol to Extend On-Board Cone-Beam CT Longitudinal Coverage with Multiple Orbits. Med Phys 2008. [DOI: 10.1118/1.2961390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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162
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Liu N, Zhang J, Zhang J, Liu S, Liu Y, Zheng D. Erbin-regulated Sensitivity of MCF-7 Breast Cancer Cells to TRAIL via ErbB2/AKT/NF- B Pathway. J Biochem 2007; 143:793-801. [DOI: 10.1093/jb/mvn032] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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163
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Lin C, Wei W, Zhang J, Liu S, Liu Y, Zheng D. Formyl peptide receptor-like 1 mediated endogenous TRAIL gene expression with tumoricidal activity. Mol Cancer Ther 2007; 6:2618-25. [DOI: 10.1158/1535-7163.mct-07-0286] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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164
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Rozowsky J, Wu J, Lian Z, Nagalakshmi U, Korbel JO, Kapranov P, Zheng D, Dyke S, Newburger P, Miller P, Gingeras TR, Weissman S, Gerstein M, Snyder M. Novel transcribed regions in the human genome. Cold Spring Harb Symp Quant Biol 2007; 71:111-6. [PMID: 17381286 DOI: 10.1101/sqb.2006.71.054] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
We have used genomic tiling arrays to identify transcribed regions throughout the human genome. Analysis of the mapping results of RNA isolated from five cell/tissue types, NB4 cells, NB4 cells treated with retinoic acid (RA), NB4 cells treated with 12-O-tetradecanoylphorbol-13 acetate (TPA), neutrophils, and placenta, throughout the ENCODE region reveals a large number of novel transcribed regions. Interestingly, neutrophils exhibit a great deal of novel expression in several intronic regions. Comparison of the hybridization results of NB4 cells treated with different stimuli relative to untreated cells reveals that many new regions are expressed upon cell differentiation. One such region is the Hox locus, which contains a large number of novel regions expressed in a number of cell types. Analysis of the trinucleotide composition of the novel transcribed regions reveals that it is similar to that of known exons. These results suggest that many of the novel transcribed regions may have a functional role.
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Affiliation(s)
- J Rozowsky
- Molecular Biophysics & Biochemistry Department, Yale University, New Haven, Connecticut 06520, USA
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165
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Zheng D, Huang S, Zhou H, Boone J. WE-E-L100J-06: Simulation Studies On Contrast Enhanced Dual Energy Mammography. Med Phys 2007. [DOI: 10.1118/1.2761581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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166
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Huang S, Zheng D, Boone J, Yang K, Packard N. WE-E-L100J-02: A Phantom Study of Contrast-Enhanced Dual Energy Mammography (CEDEM). Med Phys 2007. [DOI: 10.1118/1.2761577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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167
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Sun L, Gu S, Li X, Sun Y, Zheng D, Yu K, Ji C, Tang R, Xie Y, Mao Y. Identification of a novel human MAST4 gene, a new member of human microtubule associated serine/threonine kinase family. Mol Biol 2006. [DOI: 10.1134/s0026893306050062] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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168
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Sun L, Gu S, Li X, Sun Y, Zheng D, Yu K, Ji C, Tang R, Xie Y, Mao Y. [Identification of a novel human MAST4 gene, a new member of the microtubule associated serine-threonine kinase family]. Mol Biol (Mosk) 2006; 40:808-15. [PMID: 17086981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Human protein kinases make up a large superfamily of homologous proteins, which are related by virtue of their kinase domains (also known as catalytic domains). Here we report the cloning and characterization of a novel human MAST4 (microtubule associated serine/threonine kinase family member 4) gene, which locates on human chromosome 5q13. The MAST4 cDNA is 7587 base pairs in length and encodes a putative protein of 2435 amino acids which contains a serine/threonine kinase domain and a PDZ domain. MAST4 protein has 64%, 63%, 59% and 39% identical aminoacid residues with MAST1, MAST2, MAST3 and MASTL respectively. RT-PCR analysis revealed relatively high expression level of MAST4 in most normal human tissues, with an exception of in testis, small intestine, colon and peripheral blood leukocyte.
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169
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Lyons TJ, Jenkins AJ, Zheng D, Klein RL, Otvos JD, Yu Y, Lackland DT, McGee D, McHenry MB, Lopes-Virella M, Garvey WT. Nuclear magnetic resonance-determined lipoprotein subclass profile in the DCCT/EDIC cohort: associations with carotid intima-media thickness. Diabet Med 2006; 23:955-66. [PMID: 16922701 DOI: 10.1111/j.1464-5491.2006.01905.x] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIMS To relate nuclear magnetic resonance lipoprotein subclass profiles (NMR-LSP) and other lipoprotein-related factors with carotid intima-media thickness (IMT) in Type 1 diabetes. METHODS Lipoprotein-related factors were determined in sera (obtained in 1997-1999) from 428 female [age 39 +/- 7 years (mean +/- SD)] and 540 male (age 40 +/- 7 years) Diabetes Control and Complications Trial (DCCT)/Epidemiology of Diabetes Interventions and Complications (EDIC) participants. NMR quantifies chylomicrons, three very low-density lipoprotein (VLDL) subclasses, intermediate density lipoprotein (IDL), three low-density lipoprotein (LDL) subclasses, two high-density lipoprotein (HDL) subclasses, mean VLDL, LDL and HDL size, and LDL particle concentration. Conventional lipids, ApoA1, ApoB and Lp(a) and in vitro LDL oxidizibility were also measured. IMT was determined (in 1994-1995) using high-resolution B-mode ultrasound. Relationships between IMT and lipoproteins were analysed by multiple linear regression, controlling for age, diabetes-related factors, and cardiovascular disease (CVD) risk factors. RESULTS IMT associations with lipoproteins were stronger for the internal than the common carotid artery, predominantly involving LDL. Internal carotid IMT was positively (P < 0.05) associated with NMR-based LDL subclasses and particle concentration, and with conventional LDL-cholesterol and ApoB in both genders. Common carotid IMT was associated, in men only, with large VLDL, IDL, conventional LDL cholesterol and ApoB. CONCLUSIONS NMR-LSP reveals significant associations with carotid IMT in Type 1 diabetic patients, even 4 years after IMT measurement. NMR-LSP may aid early identification of high-risk diabetic patients and facilitate monitoring of interventions. Longer DCCT/EDIC cohort follow-up will yield CVD events and IMT progression, permitting more accurate assessment of pre-morbid lipoprotein profiles as determinants of cardiovascular risk in Type 1 diabetes.
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Affiliation(s)
- T J Lyons
- Section of Endocrinology and Diabetes, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA.
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170
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Zheng D, Angenent LT, Raskin L. Monitoring granule formation in anaerobic upflow bioreactors using oligonucleotide hybridization probes. Biotechnol Bioeng 2006; 94:458-72. [PMID: 16628749 DOI: 10.1002/bit.20870] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The process of granule formation in upflow anaerobic sludge blanket (UASB) reactors was studied using oligonucleotide hybridization probes. Two laboratory-scale UASB reactors were inoculated with sieved primary anaerobic digester sludge from a municipal wastewater treatment plant and operated similarly except that reactor G was fed glucose, while reactor GP was fed glucose and propionate. Size measurements of cell aggregates and quantification of different populations of methanogens with membrane hybridization targeting the small-subunit ribosomal RNA demonstrated that the increase in aggregate size was associated with an increase in the abundance of Methanosaeta concilii in both reactors. In addition, fluorescence in situ hybridization showed that the major cell components of small aggregates collected during the early stages of reactor startup were M. concilii cells. These results indicate that M. concilii filaments act as nuclei for granular development. The increase in aggregate size was greater in reactor GP than in reactor G during the early stages of startup, suggesting that the presence of propionate-oxidizing syntrophic consortia assisted the formation of granules. The mature granules formed in both reactors exhibited a layered structure with M. concilii dominant in the core, syntrophic consortia adjacent to the core, and filamentous bacteria in the surface layer. The excess of filamentous bacteria caused delay of granulation, which was corrected by increasing shear through an increase of the recycling rate.
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Affiliation(s)
- D Zheng
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
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171
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Xia K, Wu L, Liu X, Xi X, Liang D, Zheng D, Cai F, Pan Q, Long Z, Dai H, Hu Z, Tang B, Zhang Z, Xia J. Mutation in PITX2 is associated with ring dermoid of the cornea. J Med Genet 2004; 41:e129. [PMID: 15591271 PMCID: PMC1735645 DOI: 10.1136/jmg.2004.022434] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- K Xia
- National Laboratory of Medical Genetics of China, Central South University, Changsha, Hunan, China.
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172
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Gómez-Marín O, Fleming LE, Lee DJ, LeBlanc W, Zheng D, Ma F, Jané D, Pitman T, Caban A. Acute and chronic disability among U.S. farmers and pesticide applicators: the National Health Interview Survey (NHIS). J Agric Saf Health 2004; 10:275-85. [PMID: 15603226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Abstract
The National Health Interview Survey (NHIS) is a multipurpose household survey of the U.S. civilian non-institutionalized population conducted annually since 1957. From 1986 to 1994, over 450,000 U.S. workers, age 18 years and older, participated in a probability sampling of the entire non-institutionalized U.S. population; variables collected included a range of measures of acute and chronic disability. The objective of the present study was to assess predictors of health status, and acute and chronic disability for farmers and pesticide applicators (pesticide-exposed workers) compared to all other U.S. workers using the 1986-1994 NHIS. After adjustment for sample weights and design effects using SUDAAN, several measures of acute and chronic disability and health status were modeled with multiple logistic regression. Farmers (n = 9576) were significantly older compared to all other U.S. workers (n = 453,219) and pesticide applicators (n = 180). Farmers and pesticide applicators had a higher proportion of males, whites, and Hispanics and were less educated. After adjusting for age, gender, race-ethnicity, and education, compared to all other workers, farmers were significantly less likely to report acute and chronic disability and health conditions, while pesticide applicators were more likely to report chronic disability, health conditions, and poor health. Given the cross-sectional nature of the data and the significant job demands of farming, both leading to a relative healthy worker effect, the present results indicate that at any point in time, farmers report less acute and chronic disability, compared to other U.S. workers, whereas pesticide applicators report similar or poorer health.
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Affiliation(s)
- O Gómez-Marín
- Department of Epidemiology and Public Health, University of Miami School of Medicine, 1801 NW 9th Avenue, Suite 200L, Highland Professional Building, Miami, FL 33136, USA.
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173
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Abstract
OBJECTIVE We introduced and evaluated the advantages and disadvantages of the hand-assisted transperitoneal laparoscopic technique for living donor nephrectomy. MATERIALS AND METHODS In December 2001, we started using the technique of hand-assisted transperitoneal laparoscopic living donor nephrectomy (HLDN) in 10 cases. The procedure utilizes a hand-assisted device to increase safety and control of the laparoscopic technique. RESULTS Only left nephrectomy was performed. The mean total operating and the warm ischemia times were 130 minutes and 3.0 minutes, respectively. Average lengths of renal artery and vein were 1.95 cm and 2.8 cm, respectively. There were no intraoperative or postoperative complications. CONCLUSIONS HLDN is an easier procedure than the traditional laparoscopic living donor nephrectomy and can greatly mitigate the learning curve. HLDN has shortened warm ischemia time and operating time. It is also good for trocar placement, prevention of torsion of the kidney, control of potential bleeding at the final stage of vascular stapling, and kidney removal. Therefore, HLDN is a promising method for living donor nephrectomy.
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Affiliation(s)
- M Cai
- Department of Urology, Beijing, China
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174
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Wu LQ, Yang YF, Zheng D, Deng H, Pan Q, Zhao TL, Cai F, Feng Y, Long ZG, Dai HP, Tang BS, Yang YJ, Deng HX, Xia K, Xia JH. Confirmation and refinement of a genetic locus for disseminated superficial actinic porokeratosis (DSAP1) at 12q23.2-24.1. Br J Dermatol 2004; 150:999-1004. [PMID: 15149516 DOI: 10.1111/j.1365-2133.2004.05912.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND Our previous study has identified two loci for disseminated superficial actinic porokeratosis (DSAP), but the genes responsible are still unknown. OBJECTIVES To narrow down the candidate regions and to assess candidate genes. METHODS A genome-wide scan and linkage analysis were carried out in a newly collected five-generation Chinese family with DSAP. In addition, six candidate genes were screened for possible DSAP-associated mutations. RESULTS DSAP in this family was associated with chromosome 12q. Fine mapping and haplotype construction refined the DSAP1 locus to a 4.4-cM interval. No disease-associated mutation was detected in CRY1, C4ST1, TXNRD1, HCF2, CMKLR1 or KIAA0789 genes. CONCLUSIONS The DSAP1 locus was localized to a 4.4-cM interval at chromosome 12q23.2-24.1. CRY1, C4ST1, TXNRD1, HCF2, CMKLR1 and KIAA0789 genes were not associated with DSAP1.
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Affiliation(s)
- L Q Wu
- National Laboratory of Medical Genetics, Xiangya Second Hospital, Central South University, Changsha, Hunan 410078, China
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Zheng D, Zhou C, Su B. The in vitro synergistic cytotoxic effects of inductive, concurrent and sequential cyclooxygenase-2 inhibitor with cisplatin against A549 cell line. J Clin Oncol 2004. [DOI: 10.1200/jco.2004.22.90140.9693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- D. Zheng
- Shanghai Pulmonary Diseases Hosptial, Shanghai, China
| | - C. Zhou
- Shanghai Pulmonary Diseases Hosptial, Shanghai, China
| | - B. Su
- Shanghai Pulmonary Diseases Hosptial, Shanghai, China
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177
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Zheng D, Fong J, Shao Z, Lian Y, Wu C. Thermal oxide based silica ridge waveguide. Opt Express 2004; 12:1753-1758. [PMID: 19475002 DOI: 10.1364/opex.12.001753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A silica planar waveguide structure, where a ridge waveguide resides on a vacuum gap, was invented. The silica layer, which was fabricated through thermal oxidation at 1150 masculineC, had an excellent optical index uniformity on the order of 3x10(-5) @1550 nm, and a thickness uniformity of 10 nm at a thickness of 10 microm. Straight waveguide with low insertion loss was demonstrated. Improved thermal efficiency of this structure to cause phase change was discussed in comparison to the conventional channel waveguide structure. Finally, the limitation of this technology to make complex device structures was also explored.
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178
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Abstract
Anaerobic reactor systems are essential for the treatment of solid and liquid wastes and constitute a core facility in many waste treatment plants. Although much is known about the basic metabolism in different types of anaerobic reactors, little is known about the microbes responsible for these processes. Only a few percent of Bacteria and Archaea have so far been isolated, and almost nothing is known about the dynamics and interactions between these and other microorganisms. This lack of knowledge is most clearly exemplified by the sometimes unpredictable and unexplainable failures and malfunctions of anaerobic digesters occasionally experienced, leading to sub-optimal methane production and wastewater treatment. Using a variety of molecular techniques, we are able to determine which microorganisms are active, where they are active, and when they are active, but we still need to determine why and what they are doing. As genetic manipulations of anaerobes have been shown in only a few species permitting in-situ gene expression studies, the only way to elucidate the function of different microbes is to correlate the metabolic capabilities of isolated microbes in pure culture to the abundance of each microbe in anaerobic reactor systems by rRNA probing. This chapter focuses on various molecular techniques employed and problems encountered when elucidating the microbial ecology of anaerobic reactor systems. Methods such as quantitative dot blot/fluorescence in-situ probing using various specific nucleic acid probes are discussed and exemplified by studies of anaerobic granular sludge, biofilm and digester systems.
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Affiliation(s)
- J Hofman-Bang
- Environmental Microbiology and Biotechnology, Biocentrum DTU, The Technical University of Denmark, Building 227, 2800 Lyngby, Denmark.
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179
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Atchley DH, Lopes-Virella MF, Zheng D, Kenny D, Virella G. Oxidized LDL-anti-oxidized LDL immune complexes and diabetic nephropathy. Diabetologia 2002; 45:1562-71. [PMID: 12436340 DOI: 10.1007/s00125-002-0962-y] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2002] [Revised: 07/17/2002] [Indexed: 10/27/2022]
Abstract
AIMS/HYPOTHESIS Oxidized LDL is immunogenic and immune complexes formed by oxidized LDL and corresponding antibodies are pro-atherogenic and pro-inflammatory. Considering that macroalbuminuria is a risk factor for coronary heart disease and that common pathogenic factors for atherosclerosis and glomerulosclerosis exist, our aim was to determine whether the amount and/or characteristics of oxidized LDL- anti-oxidized LDL complexes correlated with the degree of albuminuria in patients with Type I (insulin-dependent) diabetes mellitus. METHODS We studied 33 macroalbuminuric patients (albumin excretion rate >300 mg/24 h) and 29 microalbuminuric patients (albumin excretion rate >or=30 mg/24 h and <or=300 mg/24 h) who were matched for age, sex and HbA(1C) concentrations with 43 patients with normal albuminuria. In all patients we isolated and characterized oxidized LDL-anti-oxidized LDL complexes. A subgroup of 47 patients (22 with normal albuminuria, 11 with microalbuminuria, and 14 with macroalbuminuria) was randomly selected from the larger group for characterization of the antibody moiety of oxidized LDL immune complexes. RESULTS The concentrations of oxidized LDL immune complexes were increased in patients with macroalbuminuria (total cholesterol in immune complexes isolated from patients with macroalbuminuria was 272+/-20 vs 204+/-18 micro g/ml in patients with normoalbuminuria, p<0.03). Also, the Kd of oxLDL antibodies isolated from the immune complexes was lower in patients with abnormal albuminuria than in patients with normoalbuminuria (0.86+/-0.1x10(-8) vs 1.13+/-0.1x10(-8) mol/l, p<0.05). CONCLUSION/INTERPRETATION The data indicate that high concentrations of oxidized LDL-anti-oxidized LDL complexes, particularly when formed with antibodies of higher avidity, are associated with abnormal proteinuria.
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Affiliation(s)
- D H Atchley
- Department of Microbiology and Immunology, Medical University of South Carolina, Charleston, South Carolina 29425, USA
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180
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Xia K, Deng H, Xia JH, Zheng D, Zhang HL, Lu CY, Li CQ, Pan Q, Dai HP, Yang YF, Long ZG, Deng HX. A novel locus (DSAP2) for disseminated superficial actinic porokeratosis maps to chromosome 15q25.1-26.1. Br J Dermatol 2002; 147:650-4. [PMID: 12366408 DOI: 10.1046/j.1365-2133.2002.05058.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND Disseminated superficial actinic porokeratosis (DSAP) is a chronic cutaneous disorder characterized by multiple superficial keratotic lesions surrounded by a slightly raised keratotic border. It develops in teenagers in sun-exposed areas of skin and usually follows an autosomal dominant inheritance pattern. The first locus for DSAP was localized to chromosome 12q23.2-24.1, but no gene responsible for porokeratosis has been identified to date. OBJECTIVES To determine whether DSAP is a genetically heterogeneous disorder and to identify the disease gene locus in a three-generation Chinese family with DSAP. METHODS Genetic linkage analysis was carried out in this family using 15 microsatellite markers between D12S1671 and D12S369 on chromosome 12q, followed by a genome-wide scan with 382 microsatellite markers from the autosomes. RESULTS Genetic linkage analysis with chromosome 12q markers suggested that the locus in this family is not linked to chromosome 12q. A genome-wide scan and fine mapping finally localized the locus for DSAP in this family to a 6.4-cM region between markers D15S1023 and D15S1030 at chromosome 15q25.1-26.1. This DSAP locus was named DSAP2. CONCLUSIONS The previous results and this study have shown that DSAP is a genetically heterogeneous disorder; a novel locus for DSAP, termed DSAP2, was mapped to a 6.4-cM region between markers D15S1023 and D15S1030.
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Affiliation(s)
- K Xia
- National Laboratory of Medical Genetics, Department of Dermatology, Xiangya Hospital, Changsha, Hunan 410078, China.
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181
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Virella G, Atchley D, Koskinen S, Zheng D, Lopes-Virella MF. Proatherogenic and proinflammatory properties of immune complexes prepared with purified human oxLDL antibodies and human oxLDL. Clin Immunol 2002; 105:81-92. [PMID: 12483997 DOI: 10.1006/clim.2002.5269] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Immune complexes (IC) prepared with human low density lipoprotein (LDL) and rabbit LDL antibodies induce foam cell transformation of human macrophages and activate the release of proinflammatory mediators by human macrophages and THP-1 cells. Because the affinity of human oxidized LDL (oxLDL) antibodies is lower than that of rabbit antibodies, IC formed with human antibodies could have limited pathogenic potential. Immune complexes prepared with human oxidized LDL (oxLDL) and purified human oxLDL antibodies (predominantly of the IgG1 and IgG3 isotypes) were presented to THP-1 cells using two protocols previously described in studies of the properties of LDL-IC prepared with rabbit antibodies. OxLDL/human oxLDL antibody IC immobilized by adsorption to red blood cells (RBC) induced the release of significantly higher levels of TNF from THP-1 cells (872-313 pg/ml) than oxLDL adsorbed to RBC (461-75.6 pg/ml) and caused a higher degree of cholesterol ester accumulation in the same cells (5.4-0.77 in cells incubated with IC-coated RBC vs 1.99-1.16 in oxLDL-coated RBC). Insoluble IC prepared with oxLDL/human oxLDL antibody were even more effective in promoting intracellular accumulation of cholesterol in THP-1 cells (total cholesterol = 53.8-13.5 and cholesterol esters = 24.0-7.2 mg/l in THP-1 cells incubated with insoluble IC (200 micrograms) vs total cholesterol = 32.4-8.2 and cholesterol esters = 7.7 +/- 2.8 micrograms/l in THP-1 cells incubated with an identical concentration of oxLDL) and also induced the release of TNF. Thus we have demonstrated that IC prepared with human oxLDL and human oxLDL antibodies have the same atherogenic and proinflammatory properties as IC prepared with human LDL and rabbit LDL antibodies. This strongly supports the concept that modified LDL-IC present in circulation and/or tissues play an important pathogenic role in arteriosclerosis.
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Affiliation(s)
- G Virella
- Department of Microbiology and Immunology, Medical University of South Carolina, Charleston, South Carolina 29403, USA
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182
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183
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Zheng D, Hoo KA, Piovoso MJ. Low-Order Model Identification of Distributed Parameter Systems by a Combination of Singular Value Decomposition and the Karhunen−Loève Expansion. Ind Eng Chem Res 2002. [DOI: 10.1021/ie0102899] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- D. Zheng
- Department of Chemical Engineering, Texas Tech University, Lubbock, Texas 79409-3121
| | - K. A. Hoo
- Department of Chemical Engineering, Texas Tech University, Lubbock, Texas 79409-3121
| | - M. J. Piovoso
- School of Graduate Professional Studies, Penn State University, Malvern, Pennsylvania 19355
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184
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Li S, Zheng D, Yang Q. [Some issues on assessing natural capital of environment and ecosystems]. Huan Jing Ke Xue 2001; 22:103-7. [PMID: 11855168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
Many researchers recently have paid attentions to analyzing ecosystem services and assessing natural capital stocks of environment and ecosystems. However, some works failed to make a distinction among the concepts, to evaluate the value and merit of ecosystems, and to integrate assessment approaches. This paper attempts to calibrate those deviations and to present new paradigm for monetary evaluation of ecosystem services and its capital stocks. Firstly, capital value of environment and ecosystems as well as species' value should be evaluated. Secondly, new comprehensive paradigm should be employed to assess the service value of environment and ecosystems, which integrates type and regional models. Thirdly, special attentions should be paid to patterns of natural capital of environment and ecosystems due to their spatial and temporal accumulations and flows. Finally, some suggestions are proposed for assessing natural capital.
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Affiliation(s)
- S Li
- Department of Urban and Environmental Sciences, Peking University, Center for Land Studies, Lab for Earth Surface Processes, Ministry of Education, Beijing 100871, China.
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185
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Mileykovskaya E, Dowhan W, Birke RL, Zheng D, Lutterodt L, Haines TH. Cardiolipin binds nonyl acridine orange by aggregating the dye at exposed hydrophobic domains on bilayer surfaces. FEBS Lett 2001; 507:187-90. [PMID: 11684095 DOI: 10.1016/s0014-5793(01)02948-9] [Citation(s) in RCA: 116] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
10-N-Nonyl acridine orange (NAO) has been used at low concentrations as a fluorescent indicator for cardiolipin (CL) in membranes and bilayers. The mechanism of its selective fluorescence in the presence of CL, and not any other phospholipids, is not understood. The dye might recognize CL by its high pK (pK(2)>8.5). To investigate that, we established that NAO does not exhibit a pK in a pH range between 2.3 and 10.0. A second explanation is that the dye aggregates at hydrophobic domains on bilayers exposed by the CL. We found that a similar spectral shift occurs in the absence of CL in a concentrated solution of the dye in methanol and in the solid state. A model is proposed in which the nonyl group inserts in the bilayer at the hydrophobic surface generated by the presence of four chains on the phospholipid.
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186
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Herlache TC, Zhang HS, Ried CL, Carle SA, Zheng D, Basaran P, Thaker M, Burr AT, Burr TJ. Mutations that Affect Agrobacterium vitis-Induced Grape Necrosis also Alter Its Ability to Cause a Hypersensitive Response on Tobacco. Phytopathology 2001; 91:966-972. [PMID: 18944123 DOI: 10.1094/phyto.2001.91.10.966] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
ABSTRACT Tn5-induced mutations in Agrobacterium vitis F2/5 resulted in both altered grape necrosis and tobacco leaf panel collapse phenotypes, suggesting that the underlying mechanisms of the reactions are related. The reaction on tobacco resembles the classical hypersensitive response (HR) caused by several plant pathogenic bacteria in that it is observable within 14 h, is inhibited by treatment of plants with metabolic inhibitors, and results in the inability to recover the pathogen from the necrotic zone. Strains of A. vitis differ with regard to their efficiency of causing the reaction on tobacco. An EcoRI fragment from one mutant, M6, which is necrosis-altered and HR-minus, was cloned and sequenced. Sequence analysis revealed that the Tn5 insertion occurred in a region that shares significant homology with genes involved in long chain fatty acid production by the marine bacteria Shewanella spp. and Moritella marina. Complementation of M6 with a cosmid clone from an F2/5 DNA library restored the tobacco HR and grape necrosis phenotypes.
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187
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Yang H, Zheng D, Huang J, Huang Y, Zhang Z. The clinical study of Healon 5 in phacoemulsification and IOL implantation. Yan Ke Xue Bao 2001; 17:186-90. [PMID: 12567750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
PURPOSE To compare a new ophthalmic viscoelastic device (OVD) Healon 5 with two other kinds of OVDs commonly used in China during phacoemulsification and intraocular lens (IOL) implantation in terms of removal time, intraocular pressure, corneal and anterior chamber response. METHODS This prospective randomized study, in which patients and observers are masked, comprises niety eyes. They were randomly divided into 3 groups with different OVDs. Healon 5 (sodium hyaluronate 5,000 2.3%) was compared with Healon GV (sodium hyaluronate 7,000 1.4%) and Iviz (sodium hyaluronate 1.0%). The surgeries were performed with temporal corneal incision, phacoemulsification in situ and foldable lens intracapsular implantation. The characteristic and the removal time of the viscoelastic material as well as the postoperative IOP, corneal reaction and anterior chamber reactions of the eyes were observed preoperatively and 24 hrs postoperatively. Exclusion criteria were glaucoma, a preoperative dilated pupil diameter smaller than 5.0 mm, proliferative diabetic retinopathy, significant corneal pathology or a history of uveitis. RESULTS The removal time was 47.42 +/- 13.09 seconds in Healon 5, 16.50 +/- 5.45 in Healon GV and 15.83 +/- 7.40 in Iviz. The removal time of Healon 5 group was significantly longer than that of the other groups (P = 0.000). There is no significant IOP change 24 hours postoperatively and the difference of intraocular pressure among three groups was not significant (P > 0.05). Healon 5 group had the slightest corneal and anterior chamber response, followed by Healon GV and Iviz. CONCLUSION Although takes longer time to remove, Healon 5 is an ideal viscoelastic material for its superior space maintenance capacity and high dispersity which provides superior protection of endothelial cells compared to Healon GV and Iviz.
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Affiliation(s)
- H Yang
- Zhongshan Ophthalmic Center, Sun Yat-sen University of Medical Sciences, Guangzhou 510060, China
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188
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Zheng D, MacLean PS, Pohnert SC, Knight JB, Olson AL, Winder WW, Dohm GL. Regulation of muscle GLUT-4 transcription by AMP-activated protein kinase. J Appl Physiol (1985) 2001; 91:1073-83. [PMID: 11509501 DOI: 10.1152/jappl.2001.91.3.1073] [Citation(s) in RCA: 206] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Skeletal muscle GLUT-4 transcription in response to treatment with 5-aminoimidazole-4-carboxamide-1-beta-D-ribofuranoside (AICAR), a known activator of AMP-activated protein kinase (AMPK), was studied in rats and mice. The increase in GLUT-4 mRNA levels in response to a single subcutaneous injection of AICAR, peaked at 13 h in white and red quadriceps muscles but not in the soleus muscle. The mRNA level of chloramphenicol acyltransferase reporter gene which is driven by 1,154 or 895 bp of the human GLUT-4 proximal promoter was increased in AICAR-treated transgenic mice, demonstrating the transcriptional upregulation of the GLUT-4 gene by AICAR. However, this induction of transcription was not apparent with 730 bp of the promoter. In addition, nuclear extracts from AICAR-treated mice bound to the consensus sequence of myocyte enhancer factor-2 (from -473 to -464) to a greater extent than from saline-injected mice. Thus AMP-activated protein kinase activation by AICAR increases GLUT-4 transcription by a mechanism that requires response elements within 895 bp of human GLUT-4 proximal promoter and that may be cooperatively mediated by myocyte enhancer factor-2.
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Affiliation(s)
- D Zheng
- Department of Biochemistry, Brody School of Medicine, East Carolina University, Greenville, North Carolina 27858, USA
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189
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Xi W, Sun L, Yao J, Hu J, Zheng D, Liu Y, Hui L, Wang B, Liu G. Relationship between hyperventilation and intracranial pressure in patients with severe head injury. Chin J Traumatol 2001; 4:190-2. [PMID: 11835730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
With high fatality rate and disability rate, the pathophysiologic changes of severe head injury are complicated. But the method of lowering intracranial pressure (ICP) through artificial hyperventilation is called in question recently. To understand the related changes of the partial pressure of carbon dioxide in artery (PaCO(2)) and the ICP at the acute period of severe head injury, a total of 64 patients with severe head injury were monitored and analyzed on the 3rd day after injury.
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Affiliation(s)
- W Xi
- Department of Neurosurgery, 155th Hospital of PLA, Kaifeng 475003, China
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190
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Ying B, Li X, Zheng D, Gao J. [Optimizing the synthesis of hydroxyapatite as a method for the defluoridation of drinking water]. Wei Sheng Yan Jiu 2001; 30:244-6. [PMID: 12561527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
As the cheaper raw materials for the synthesis of hydroxyapatite as a defluoridator, calcium hydroxide and phosphoric acid are used. Hydroxyapatite is made by a hydro-synthesis method, and optimum conditions are determined by batch test for defluoridation with respect to the consumption of phosphoric acid, reaction time and acid-washed product. The results showed that the defluoridation capacity of the synthetic hydroxyapatite for break through (F- 1.0 mg/L is considered as the break through point) was F- 5.6 mg/g in column test, and F- 10.7 mg/g for saturation in column test. After optimization of the synthesis method, the defluoridation capacity of hydroxyapatite is much higher than activated alumina and bone charcoal, which are used currently.
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Affiliation(s)
- B Ying
- Institute of Environmental Health & Engineering, Chinese Academy of Preventive Medicine, Beijing 100050, China
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191
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Bertone P, Kluger Y, Lan N, Zheng D, Christendat D, Yee A, Edwards AM, Arrowsmith CH, Montelione GT, Gerstein M. SPINE: an integrated tracking database and data mining approach for identifying feasible targets in high-throughput structural proteomics. Nucleic Acids Res 2001; 29:2884-98. [PMID: 11433035 PMCID: PMC55760 DOI: 10.1093/nar/29.13.2884] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
High-throughput structural proteomics is expected to generate considerable amounts of data on the progress of structure determination for many proteins. For each protein this includes information about cloning, expression, purification, biophysical characterization and structure determination via NMR spectroscopy or X-ray crystallography. It will be essential to develop specifications and ontologies for standardizing this information to make it amenable to retrospective analysis. To this end we created the SPINE database and analysis system for the Northeast Structural Genomics Consortium. SPINE, which is available at bioinfo.mbb.yale.edu/nesg or nesg.org, is specifically designed to enable distributed scientific collaboration via the Internet. It was designed not just as an information repository but as an active vehicle to standardize proteomics data in a form that would enable systematic data mining. The system features an intuitive user interface for interactive retrieval and modification of expression construct data, query forms designed to track global project progress and external links to many other resources. Currently the database contains experimental data on 985 constructs, of which 740 are drawn from Methanobacterium thermoautotrophicum, 123 from Saccharomyces cerevisiae, 93 from Caenorhabditis elegans and the remainder from other organisms. We developed a comprehensive set of data mining features for each protein, including several related to experimental progress (e.g. expression level, solubility and crystallization) and 42 based on the underlying protein sequence (e.g. amino acid composition, secondary structure and occurrence of low complexity regions). We demonstrate in detail the application of a particular machine learning approach, decision trees, to the tasks of predicting a protein's solubility and propensity to crystallize based on sequence features. We are able to extract a number of key rules from our trees, in particular that soluble proteins tend to have significantly more acidic residues and fewer hydrophobic stretches than insoluble ones. One of the characteristics of proteomics data sets, currently and in the foreseeable future, is their intermediate size ( approximately 500-5000 data points). This creates a number of issues in relation to error estimation. Initially we estimate the overall error in our trees based on standard cross-validation. However, this leaves out a significant fraction of the data in model construction and does not give error estimates on individual rules. Therefore, we present alternative methods to estimate the error in particular rules.
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Affiliation(s)
- P Bertone
- Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT 06520, USA
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192
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Doolette DJ, Upton RN, Zheng D. Diffusion-limited tissue equilibration and arteriovenous diffusion shunt describe skeletal muscle nitrous oxide kinetics at high and low blood flows in sheep. Acta Physiol Scand 2001; 172:167-77. [PMID: 11472303 DOI: 10.1046/j.1365-201x.2001.00850.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
This study evaluated the relative importance of perfusion and diffusion mechanisms in compartmental models of blood : tissue inert gas exchange in skeletal muscle. Nitrous oxide kinetics in a hind limb skeletal muscle bed were determined during and after 20 min of nitrous oxide inhalation, at separate low and high steady states of hind limb blood flow in five sheep under halothane anaesthesia. Nitrous oxide concentrations in arterial and femoral vein blood were determined using gas chromatographic analysis and femoral vein blood flow was monitored continuously. Parameters and model selection criteria of various perfusion- or diffusion-limited structural models of skeletal muscle were estimated by simultaneous fitting of the models to the mean observed femoral vein nitrous oxide concentration for both blood flow states. Purely perfusion-limited models fit the data poorly. Models that allowed a diffusion-limited exchange of nitrous oxide between a perfusion-limited tissue compartment and an unperfused deep compartment provided better overall fit of the data and credible parameter estimates. The data was best described by allowing, in addition to diffusion-limited tissue equilibration, counter current diffusion of nitrous oxide between arterial and venous blood. The level of tissue blood flow modifies the magnitudes of both these diffusion effects. These results suggest a dual role of diffusion in blood : tissue inert gas equilibration in skeletal muscle.
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Affiliation(s)
- D J Doolette
- Anaesthesia and Intensive Care, The University of Adelaide, Adelaide, Australia; Anaesthesia and Intensive Care, Royal Adelaide Hospital, Adelaide, Australia
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193
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Zheng CX, Zhan WH, Zhao JZ, Zheng D, Wang DP, He YL, Zheng ZQ. Prognostic value of preoperative serum levels of CEA, CA19-9 and CA72-4 in patients with colorectal cancer. World J Gastroenterol 2001; 7:431-4. [PMID: 11819806 PMCID: PMC4688738 DOI: 10.3748/wjg.v7.i3.431] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Affiliation(s)
- C X Zheng
- Department of General Surgery, First Affiliated Hospital, Sun Yat-Sen University of Medical Sciences, 58 Zhongshan 2nd Road, Guangzhou 510080, Guangdong Province, China.
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194
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Zheng D, Liu Y, Huang J, Zheng H. [The inhibitory effect of mitomycin C applied by intracapsular method on rabbit lens epithelial cells: an experimental study of after-cataract]. Yan Ke Xue Bao 2001; 17:88-92. [PMID: 12567758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
OBJECTIVE To study the inhibitory effect of Mitomycin C applied by intracapsular infusion method on rabbit lens epithelial cells and its intraocular toxicity. METHODS 0.2 ml Mitomycin C with different concentration (0.1 mg/ml, 0.2 mg/ml, 0.4 mg/ml) was injected into the capsular bags of the rabbits' lens during the hydrodissection of phacoemulsification. The drug was exposed to the lens epithelial cells directly and transiently. In the two-month follow-up after the operation, the posterior capsule opacification and the change of intraocular pressure were observed and compared between the control group and the experimental group; the histopathologic and the ultrastructural changes were also observed. RESULTS For clinical study in the rabbit, the posterior capsule opacification only appeared in the control group two weeks after the operation. Four weeks after the operation, the posterior capsular opacification in the eyes of experimental group was not so obvious as that of the control group. The higher the concentration of the drugs, the less the posterior capsule opacification was shown. There was no obvious difference in the postoperative inflammation between the control group and the low, middle-concentration experimental group. Slight toxic reaction was shown on the rabbits' eyes of the high-concentration experimental group in the early stage after the operation. The histopathologic examination showed that the proliferation of lens epithelial cells in the control group was more obvious than that in the experimental group. Mitomycin C could cause the degeneration of lens epithelial cells. The degree of degeneration was related to the drug's concentration. The ciliary bodies of the rabbits' eyes in the high-concentration experimental group were infiltrated by inflammatory cells and bled slightly. CONCLUSION Mitomycin C can inhibit the proliferation of lens epithelial cells effectively. Its intensity is related to the drug's concentration. It's a safe and effective drug in the prevention of after-cataract when the concentration of 0.1-0.2 mg/ml was applied in the capsular bag.
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Affiliation(s)
- D Zheng
- Zhongshan Ophthalmic Center, Sun Yat-sen University of Medical Sciences, Guangzhou 510060, China
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195
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Abstract
Six distinct serotypes of the chicken B blood group system (which encodes the major histocompatibility complex) were identified in a commercial broiler breeder line (Line C). The B serotypes were compared by B-G restriction fragment length polymorphism (RFLP) analysis, allele-specific PCR typing test for B-LBII family genes and nucleotide sequence analysis of expressed B-F and B-LBII family genes. The results indicated the existence of seven distinct B haplotypes. Nucleotide sequence analysis demonstrated that three of the Line C haplotypes encode new B-F and B-LB alleles.
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Affiliation(s)
- E J Livant
- Department of Poultry Science, Auburn University Auburn, AL 36849, USA
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196
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Zheng D, Upton RN, Ludbrook GL, Martinez A. Acute cardiovascular effects of magnesium and their relationship to systemic and myocardial magnesium concentrations after short infusion in awake sheep. J Pharmacol Exp Ther 2001; 297:1176-83. [PMID: 11356944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/16/2023] Open
Abstract
The temporal relationship between the systemic and myocardial concentrations of magnesium and some of its acute cardiovascular effects were examined after short i.v. infusion administration of magnesium (30 mmol over 2 min) in five awake chronically instrumented sheep. Magnesium decreased mean arterial blood pressure and systemic vascular resistance (SVR) by 23 and 41% from baseline, respectively. These hemodynamic changes were consistent with magnesium producing primary reductions in SVR with partial heart rate (HR)-mediated compensation of blood pressure. Cardiac output and HR increased by 38 and 38% from baseline, respectively. Magnesium had little effect on myocardial contractility, but substantially increased myocardial blood flow (MBF, 77% above baseline) primarily due to direct myocardial vasodilation. The peak arterial and coronary sinus serum magnesium concentrations were 6.94 +/- 0.26 (mean +/- S.E.M.) and 6.51 +/- 0.20 mM, respectively, at 2 min. Both arterial and coronary sinus magnesium concentrations at the end of the study were still more than 3 mM, whereas all the cardiovascular effects were back to baseline. The myocardial kinetics of magnesium was consistent with rapid equilibration of magnesium (half-life 0.4 min) with a small distribution volume (71 ml) consistent with the extracellular space of the heart. In conclusion, magnesium was shown to have a rapid equilibration between the plasma/serum concentrations of magnesium and its extracellular concentration in the myocardium. However, the primary cardiovascular effect of magnesium (reductions in SVR) preceded its extracellular concentrations, and was a direct function of its arterial concentration. A "threshold" model for changes in SVR was preferred when linked to the arterial magnesium concentration.
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Affiliation(s)
- D Zheng
- Anaesthesia and Intensive Care, Royal Adelaide Hospital/University of Adelaide, North Terrace, Adelaide, Australia
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197
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Chen Y, Zheng D. [Analysis on the epidemiology of syphilis in Guangdong province from 1995 - 1999 and the strategy for syphilis control]. Zhonghua Liu Xing Bing Xue Za Zhi 2001; 22:191-3. [PMID: 11860875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To explore the epidemiologic characteristics of syphilis in Guangdong province based on the data from 1995 - 1999 in the province and to provide reference for further control of the disease. METHODS Registered cases of syphilis were collected in every city/county and the data was analyzed epidemiologically. RESULTS The incidence rate of syphilis in Guangdong province increased rapidly the past five years, went up from 1.81 per 100 thousand residents in 1995 to 15.17 per 100 thousand residents in 1999 with an average increase as high as 133.37%. The proportion of syphilis in the eight-reportable STD also increased annually with an average annual increase rate of 125.40%. Among the cases, primary cases were dominant accounting for 91.02%. Most patients were males with 20 - 29 year olds accounted for the majority. As for education level, the majority of the patients were middle school graduates. The most popular way of transmission was through extra-marrital sexual contact which accounted for 77.31%. Syphilis patients were mainly seen in coastal cities such as Guangzhou and Shenzhen. CONCLUSION Based on the epidemiologic feature of syphilis in Guangdong, following measures should be taken in order to control the disease: to enhance the STD knowledge through education, to promote the widely use of condoms and to standardize the diagnosis and treatment of syphilis.
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Affiliation(s)
- Y Chen
- Guangdong STD Center, Guangzhou 510500, China
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198
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Affiliation(s)
- D Zheng
- Department of Chemistry and Center for Analysis of Structures and Interfaces (CASI), The City College of New York, and The Graduate School and University Center of The City University of New York, New York, NY 10031, USA
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Zheng D, Schröder G, Schröder J, Hrazdina G. Molecular and biochemical characterization of three aromatic polyketide synthase genes from Rubus idaeus. Plant Mol Biol 2001; 46:1-15. [PMID: 11437245 DOI: 10.1023/a:1010642517738] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Three polyketide synthase genes (PKS1, PKS2, PKS3) from cell suspension cultures of raspberry (Rubus idaeus L. cv. Royalty) were characterized. They showed high similarity in both their nucleotide and deduced amino acid sequences. All three proteins contain the amino acid residues identified in previous work as essential for chalcone synthase (CHS) function. Enzyme activities were investigated after heterologous expression in Escherichia coli. RiPKS1 is a typical naringenin CHS that synthesizes the chalcone as the main reaction product, and p-coumaryltriacetic acid lactone (CTAL) as a minor by-product. RiPKS3 differed from RiPKS1 in four positions (K49R, M64R, P120L, V188A), and the products in vitro were predominantly CTAL and low levels of chalcone. RiPKS2 had the same four differences from RiPKS1 as RiPKS3, but in addition two further exchanges (R259H, F344L), and the protein had no detectable enzyme activity. Experiments with RiPKS1 containing either 259H or 344L showed that each of the exchanges was sufficient to completely eliminate enzyme activity. These experiments identify amino acid residues in CHS which are important for folding of the tetraketide intermediate to the chalcone (PKS3) and which are in general essential for CHS activity (PKS2). The possible functions of these residues are discussed.
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Affiliation(s)
- D Zheng
- Institute of Food Science, Cornell University, Geneva, NY 14456, USA
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Cai L, Gao S, Yang Y, Zheng D, Wang W, Zhang G, Fuyong Q. [Study on the relationship between apoptosis and reactive oxygen species of cancer cell lines induced by anticarcinogens]. Zhonghua Xue Ye Xue Za Zhi 2001; 22:249-51. [PMID: 11877081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
OBJECTIVE To investigate the relationship between apoptosis (AP) and fluorescent intensity of reactive oxygen species (ROS) in cancer cell lines induced by anticancer agents, and the mechanisms of drug sensitivity and resistance. METHOD K562 cells were treated respectively with each of the Vp16, ADR and DDP, the fluorescent intensity of ROS and AP percentage of K562 cells at different concentration of the drugs treated were assayed by flow cytometry (FCM). RESULT (1) After treatment with these drugs for 24 hours, the fluorescent intensity of ROS and AP percentage of K562 cells increased obviously as compared with that of control groups. (2) The optimum concentrations of the drugs for ROS production and AP of K562 cells were determined. CONCLUSION Anticancer agents induced AP of K562 cells, which might be through stimulating ROS production.
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Affiliation(s)
- L Cai
- China-Japan Union Hospital of Norman Bethune Medical University, Changchun 130031, China
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