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Chen D, Dong Y, Bao Y, Xiu Z. Salting-out extraction of recombinant κ-carrageenase and phage T7 released from Escherichia coli cells. Eng Life Sci 2023; 23:e2200125. [PMID: 37275213 PMCID: PMC10235888 DOI: 10.1002/elsc.202200125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Revised: 04/18/2023] [Accepted: 05/07/2023] [Indexed: 06/07/2023] Open
Abstract
Traditional technology of cell disruption has become one of the bottlenecks restricting the industrialization of genetic engineering products due to its high cost and low efficiency. In this study, a novel bioprocess of phage lysis coupled with salting-out extraction (SOE) was evaluated. The lysis effect of T7 phage on genetically engineered Escherichia coli expressing κ-carrageenase was investigated at different multiplicity of infection (MOI), meanwhile the phage and enzyme released into the lysate were separated by SOE. It was found that T7 phage could lyse 99.9% of host cells at MOI = 1 and release more than 90.0% of enzyme within 90 min. After phage lysis, 87.1% of T7 phage and 71.2% of κ-carrageenase could be distributed at the middle phase and the bottom phase, respectively, in the SOE system composed of 16% ammonium sulfate and 20% ethyl acetate (w/w). Furthermore, κ-carrageenase in the bottom phase could be salted out by ammonium sulfate with a yield of 40.1%. Phage lysis exhibits some advantages, such as mild operation conditions and low cost. While SOE can efficiently separate phage and intracellular products. Therefore, phage lysis coupled with SOE is expected to become a viable alternative to the classical cell disruption and intracellular product recovery.
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Affiliation(s)
- Da Chen
- School of BioengineeringDalian University of TechnologyDalianLiaoningPR China
| | - Yue‐Sheng Dong
- School of BioengineeringDalian University of TechnologyDalianLiaoningPR China
| | - Yong‐Ming Bao
- School of BioengineeringDalian University of TechnologyDalianLiaoningPR China
| | - Zhi‐Long Xiu
- School of BioengineeringDalian University of TechnologyDalianLiaoningPR China
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Wang X, Hu C, Qin C, Dong Y, Ying G, Xiu Z, Su Z. Simultaneous solid-liquid separation and primary purification of clavulanic acid from fermentation broth of Streptomyces clavuligerus using salting-out extraction system. Eng Life Sci 2021; 21:643-652. [PMID: 34690635 PMCID: PMC8518655 DOI: 10.1002/elsc.202000091] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Revised: 07/14/2021] [Accepted: 07/22/2021] [Indexed: 11/10/2022] Open
Abstract
Clavulanic acid (CA) is usually used together with other β-lactam antibiotics as combination drugs to inhibit bacterial β-lactamases, which is mainly produced from the fermentation of microorganism such as Streptomyces clavuligerus. Recently, it is still a challenge for downstream processing of low concentration and unstable CA from fermentation broth with high solid content, high viscosity, and small cell size. In this study, an integrated process was developed for simultaneous solid-liquid separation and primary purification of CA from real fermentation broth of S. clavuligerus using salting-out extraction system (SOES). First, different SOESs were investigated, and a suitable SOES composed of ethanol/phosphate was chosen and further optimized using the pretreated fermentation broth. Then, the optimal system composed of 20% ethanol/15% K2HPO4 and 10% KH2PO4 w/w was used to direct separation of CA from untreated fermentation broth. The result showed that the partition coefficient (K) and recovery yield (Y) of CA from untreated fermentation broth were 29.13 and 96.8%, respectively. Simultaneously, the removal rates of the cells and proteins were 99.8% and 63.3%, respectively. Compared with the traditional method of membrane filtration or liquid-liquid extraction system, this developed SOES showed the advantages of simple operation, shorter operation time, lower process cost and higher recovery yield of CA. These results demonstrated that the developed SOES could be used as an attractive alternative for the downstream processing of CA from real fermentation broth.
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Affiliation(s)
- Xu‐Dong Wang
- School of BioengineeringDalian University of TechnologyDalianP. R. China
- College of Pharmaceutical ScienceZhejiang University of TechnologyHangzhouP. R. China
| | - Chun‐Yan Hu
- School of BioengineeringDalian University of TechnologyDalianP. R. China
| | - Chao Qin
- School of BioengineeringDalian University of TechnologyDalianP. R. China
| | - Yue‐Sheng Dong
- School of BioengineeringDalian University of TechnologyDalianP. R. China
| | - Guo‐Qing Ying
- College of Pharmaceutical ScienceZhejiang University of TechnologyHangzhouP. R. China
| | - Zhi‐Long Xiu
- School of BioengineeringDalian University of TechnologyDalianP. R. China
| | - Zhi‐Guo Su
- State Key Laboratory of Biochemical EngineeringInstitute of Process EngineeringChinese Academy of SciencesBeijingP. R. China
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3
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Zeb L, Teng X, Shafiq M, Wang S, Xiu Z, Su Z. Three-liquid-phase salting-out extraction of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA)-rich oils from Euphausia superba. Eng Life Sci 2021; 21:666-682. [PMID: 34690637 PMCID: PMC8518559 DOI: 10.1002/elsc.202000098] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Revised: 03/20/2021] [Accepted: 07/14/2021] [Indexed: 11/06/2022] Open
Abstract
The TLPSOES parameters were optimized by response surface methodology using Box-Behnken design, which were 16.5% w/w of ammonium citrate, 17.5% w/w of ethanol, and 46% w/w of n-hexane at 70 min of stirring time. Under optimized conditions the extraction efficiency attained was 90.91 ± 0.97% of EPA, 90.02 ± 1.04% of DHA, and 91.85 ± 1.11% of KO in the top n-hexane phase. The highest extraction efficiency of proteins and flavonoids, i.e. 88.34 ± 1.35% and 79.67 ± 1.13%, was recorded in the solid interface and ethanol phase, respectively. The KO extracted by TLPSOES system consisted of lowest fluoride level compared to the conventional method and whole wet krill biomass. The TLPSOES is a potential candidate for nutraceutical industry of KO extraction from wet krill biomass.
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Affiliation(s)
- Liaqat Zeb
- School of BioengineeringDalian University of TechnologyDalianP. R. China
| | - Xin‐Nan Teng
- School of BioengineeringDalian University of TechnologyDalianP. R. China
| | - Muhammad Shafiq
- School of BioengineeringDalian University of TechnologyDalianP. R. China
| | - Shu‐Chang Wang
- School of BioengineeringDalian University of TechnologyDalianP. R. China
| | - Zhi‐Long Xiu
- School of BioengineeringDalian University of TechnologyDalianP. R. China
| | - Zhi‐Guo Su
- State Key Laboratory of Biochemical EngineeringInstitute of Process EngineeringChinese Academy of SciencesBeijingP. R. China
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4
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Yang X, Hu W, Xiu Z, Jiang A, Yang X, Saren G, Ji Y, Guan Y, Feng K. Effect of salt concentration on microbial communities, physicochemical properties and metabolite profile during spontaneous fermentation of Chinese northeast sauerkraut. J Appl Microbiol 2020; 129:1458-1471. [PMID: 32677269 DOI: 10.1111/jam.14786] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Revised: 06/29/2020] [Accepted: 07/12/2020] [Indexed: 11/30/2022]
Abstract
AIM The aim of this study was to study the effects of salt concentrations on the microbial communities, physicochemical properties, metabolome profiles and sensory characteristics during the fermentation of traditional northeast sauerkraut. METHODS AND RESULTS Northeast sauerkraut was spontaneously fermented under four salt concentrations (0·5, 1·5, 2·5 and 3·5%, w/w). The result of microbiological analysis showed that the population of lactic acid bacteria in 2·5%-salted sauerkraut was significantly higher than that in the other samples. Correspondingly, the speed of decrease in pH and accumulation of acids were the highest in 2·5%-salted sauerkraut. The glucose (analysed by HPLC) in 2·5%-salted sauerkraut was consumed more completely to produce higher levels of organic acids compared to those in the other samples. Principle component analysis showed clear differences in the metabolites of sauerkraut according to different salt concentrations. A higher level of volatiles (detected by HS-SPME/GC-MS) was identified in 2·5%-salted sauerkraut, and sensory evaluation demonstrated that 2·5%-salted sauerkraut had the best sensory characteristics. CONCLUSION The best quality of sauerkraut was obtained from fermented under 2·5% salt concentration. SIGNIFICANCE AND IMPACT OF THE STUDY This study facilitated the understanding of the effects of salt on the sauerkraut fermentation and may be useful for developing the quality of sauerkraut.
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Affiliation(s)
- X Yang
- School of Bioengineering, Dalian University of Technology, Dalian, Liaoning, PR China.,College of Life Science, Dalian Minzu University, Dalian, Liaoning, PR China.,Key Laboratory of Biotechnology and Bioresources Utilization, Ministry of Education, Dalian, Liaoning, PR China
| | - W Hu
- College of Life Science, Dalian Minzu University, Dalian, Liaoning, PR China.,Key Laboratory of Biotechnology and Bioresources Utilization, Ministry of Education, Dalian, Liaoning, PR China
| | - Z Xiu
- School of Bioengineering, Dalian University of Technology, Dalian, Liaoning, PR China
| | - A Jiang
- College of Life Science, Dalian Minzu University, Dalian, Liaoning, PR China.,Key Laboratory of Biotechnology and Bioresources Utilization, Ministry of Education, Dalian, Liaoning, PR China
| | - X Yang
- College of Life Science, Dalian Minzu University, Dalian, Liaoning, PR China.,Key Laboratory of Biotechnology and Bioresources Utilization, Ministry of Education, Dalian, Liaoning, PR China
| | - G Saren
- School of Bioengineering, Dalian University of Technology, Dalian, Liaoning, PR China.,College of Life Science, Dalian Minzu University, Dalian, Liaoning, PR China.,Key Laboratory of Biotechnology and Bioresources Utilization, Ministry of Education, Dalian, Liaoning, PR China
| | - Y Ji
- School of Bioengineering, Dalian University of Technology, Dalian, Liaoning, PR China.,College of Life Science, Dalian Minzu University, Dalian, Liaoning, PR China.,Key Laboratory of Biotechnology and Bioresources Utilization, Ministry of Education, Dalian, Liaoning, PR China
| | - Y Guan
- School of Bioengineering, Dalian University of Technology, Dalian, Liaoning, PR China.,College of Life Science, Dalian Minzu University, Dalian, Liaoning, PR China.,Key Laboratory of Biotechnology and Bioresources Utilization, Ministry of Education, Dalian, Liaoning, PR China
| | - K Feng
- College of Life Science, Dalian Minzu University, Dalian, Liaoning, PR China.,Key Laboratory of Biotechnology and Bioresources Utilization, Ministry of Education, Dalian, Liaoning, PR China
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5
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Wang S, Li X, Wang Q, Xiu Z. Autophagy inhibitor sensitizes MCF-7 breast cancer cells to novel cyclic tetrapeptide CTS203-induced caspase-9-dependent apoptotic cell death. Neoplasma 2015; 62:220-9. [PMID: 25591587 DOI: 10.4149/neo_2015_027] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
UNLABELLED Histone deacetylase (HDAC) inhibitors have been demonstrated to be effective anti-cancer candidates against aggressive malignancies. In previous study, a novel hydroxamic acid derivate, CTS203 (cyclo(-l-Asu(NHOH)-l-A3mc6c-l-Phe-d-Pro-)), demonstrated promising HDAC inhibitory activity. Herein, more biological evaluations including cell viability, cell cycle distribution, cellular morphology, expression quantification as well as protein-protein interactions were measured to investigate its cytotoxic mechanism. Corresponding with its significant HDAC inhibitory activity, CTS203 led to increased acetylation of H3K14, cell cycle arrest as well as consequent apoptotic cell death, with bearable influence on the viability of normal cells. However, schedule-dependent cytotoxicity against MCF-7 breast cancer cells revealed a delayed cellular response to chemo-stimuli. Within this corresponding period, autophagy was rapidly triggered once exposure started, whereas autophagy inhibitor sensitized MCF-7 cells to CTS203, exhibiting synergistically anti-proliferative effects. The expression variation in MCF-7 cells revealed that the cleavage of Beclin 1 mediated by caspase-8 resulted in disabled autophagy, thus ultimately facilitated and fastened caspase-9-dependent apoptotic cell death. Taken together, these findings elucidated the mechanism of CTS203-induced cytotoxicity as well as suggested that appropriate manipulation of autophagy would be an adjunctive strategy to enhance HDAC inhibitor-induced cell death. KEYWORDS cyclic tetrapeptide, apoptosis, autophagy, HDAC inhibitor, Beclin 1 cleavage.
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Shen H, Xiu Z, Tian Y, Xia L, Lu J. AB0065 Elevated Serum and Synovial Fluid Levels of Tumor Necrosis Factor-Like Ligand 1A and Decoy Receptor 3 in Rheumatoid Arthritis: Induce Interleukin-17 Production. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.1415] [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: 11/04/2022]
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7
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Kolbehdari D, Wang Z, Grant JR, Murdoch B, Prasad A, Xiu Z, Marques E, Stothard P, Moore SS. A whole genome scan to map QTL for milk production traits and somatic cell score in Canadian Holstein bulls. J Anim Breed Genet 2009; 126:216-27. [PMID: 19646150 DOI: 10.1111/j.1439-0388.2008.00793.x] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The detection and mapping of genetic markers linked to quantitative trait loci (QTL) can be utilized to enhance genetic improvement of livestock populations. With the completion of the bovine genome sequence assembly, single nucleotide polymorphisms (SNP) assays spanning the whole bovine genome and research work on large scale identification, validation and analysis of genotypic variation in cattle has become possible. The objective of the present study was to perform a whole genome scan to identify and map QTL affecting milk production traits and somatic cell scores using linkage disequilibrium (LD) regression and 1536 SNP markers. Three and 18 SNP were found to be associated with only milk yield (MY) at a genome and chromosome wise significance (p < 0.05) level respectively. Among the 21 significant SNP, 16 were in a region reported to have QTL for MY in other dairy cattle populations and while the rest five were new QTL finding. Four SNP out of 21 are significant for the milk production traits (MY, fat yield, protein yield (PY), and milk contents) in the present study. Six and nine SNP were associated with PY at a genome and chromosome wise significant (p < 0.05) level respectively. Three and 17 SNP were found to be associated with FY at a genome and chromosome wise significant (p < 0.05) level. Five and seven SNP were mapped with somatic cell score at a genome and chromosome wise significant (p < 0.05) level respectively. The results of this study have revealed QTL for MY, PY, protein percentage, FY, fat percentage, somatic cell score and persistency of milk in the Canadian dairy cattle population. The chromosome regions identified in this study should be further investigated to potentially identify the causative mutations underlying the QTL.
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Affiliation(s)
- D Kolbehdari
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada.
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8
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Kolbehdari D, Wang Z, Grant JR, Murdoch B, Prasad A, Xiu Z, Marques E, Stothard P, Moore SS. A whole-genome scan to map quantitative trait loci for conformation and functional traits in Canadian Holstein bulls. J Dairy Sci 2008; 91:2844-56. [PMID: 18565942 DOI: 10.3168/jds.2007-0585] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Genetic improvement of livestock populations can be achieved through detection and mapping of genetic markers linked to quantitative trait loci (QTL). With the completion of the bovine genome sequence assembly, single nucleotide polymorphism (SNP) assays spanning the whole bovine genome and research work on large-scale identification, validation, and analysis of genotypic variation in cattle has become possible. A total of 462 Canadian Holstein Bulls were used to test the association between SNP and QTL. Single locus linkage disequilibrium regression model was implemented to perform a whole genome scan to identify and map QTL affecting conformation and functional traits. One thousand five hundred thirty-six SNP markers from introns and exons of potential QTL regions for economically important traits across the bovine genome were selected for association analysis. A total of 45 and 151 SNP were found to be associated with 17 conformation and functional traits at a genome- and chromosome-wise significance level, respectively. Among the 196 significant SNP, 169 of them are newly detected in this study, whereas 27 of them have been reported in previous literature and 161 of these were located in genes and are worth further investigating to potentially identify the causative mutations underlying the QTL. The single locus linkage disequilibrium regression method using SNP marker genotypes has proven to be a successful methodology for detecting and mapping QTL in dairy cattle populations.
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Affiliation(s)
- D Kolbehdari
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada T6G 2P5
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An Y, Ji J, Lv A, Huang R, Xiu Z. [Molecular evolution of AdoMet synthetase by DNA recombination with a novel separate-mixing method]. Mol Biol (Mosk) 2006; 40:546-53. [PMID: 16813174] [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: 05/10/2023]
Abstract
We describe a new approach to in vitro DNA recombination termed Separate-Mixing method in this study. The reaction process of this method consists of two stages: at the first stage the reaction was implemented in two parallel teams, which generated random recombination by template-switching of growing polynucleotides from primers in the presence of unidirectional single-stranded DNA fragments used as templates, and then both teams were mixed together for further extension and recombination of DNA sequences at the second stage. Because of the particular strategy, the reaction process was also accompanied by the other two processes of DNA shuffling and StEP simultaneously. Two AdoMet synthetase genes sam2 from Saccharomyces cerevisiae and metK from Escherichia coli, which have only 56% homology on the DNA level were used for recombination with Separate-Mixing method. DNA recombination was available after a single round of reaction. With sequencing of 10 randomly selected recombinants, no unshuffled parental clone was found, and also no unexpected insertion, deletion or rearrangement was detected. An evolved gene sam' was obtained after screen and selection, which could obviously increase the accumulation of AdoMet in S. cerevisiae.
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An Y, Ji J, Wu W, Lv A, Huang R, Xiu Z. Molecular evolution of adomet synthetase by DNA recombination with a novel Separate-Mixing method. Mol Biol 2006. [DOI: 10.1134/s0026893306030162] [Citation(s) in RCA: 4] [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: 11/23/2022]
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Xiu Z, Song Y, Huang W. [A long-term study of a small-caliber arterial autograft used for repair of a large-caliber arterial defect]. Zhonghua Zheng Xing Wai Ke Za Zhi 2000; 16:361-3. [PMID: 11301660] [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: 02/19/2023]
Abstract
OBJECTIVE The long-term fate of a small arterial graft used to repair a large diameter artery was studied in this study. METHODS An end segment of the tail artery (0.3-0.4 mm in diameter) was transplanted to the defect of the carotid artery (1.0-1.4 mm in diameter) in 50 rats. The vessel grafts were examined histologically at 3 weeks and 5, 10 and 12 months after implantation. RESULTS At 3 weeks, intimal thickening of the grafts was mild and present only in regions adjacent to the anastomosis. At 5 months, severe intimal thickening was seen along the entire graft wall. At 10 and 12 months, the intimal thickening reduced. Regression of the thickening was uneven within the graft wall. The adventitia thickened at the early postoperative period and reduced at the end of this study. The patency rate of the grafts at 12 months postoperation was 95% (19/20). Angiography indicated that the grafts stopped expanding after 5 months and were only slightly smaller than the recipient arteries at 12 months postoperation. CONCLUSION These results suggest that a small, autogenous arterial graft may effectively repair a large-calibre arterial defect.
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Affiliation(s)
- Z Xiu
- Plastic Surgery Hospital of CAMS and PUMC, Beijing 100041, China
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Huang W, Song Y, Xiu Z. [Experimental study on revascularization of subdermal vascular network thin flap]. Zhonghua Zheng Xing Wai Ke Za Zhi 2000; 16:161-2. [PMID: 11593693] [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: 02/21/2023]
Abstract
OBJECTIVE To investigate the survival mechanism of subdermal vascular network thin flap (SVNF). METHODS 24 rabbits were divided into three groups, in which the SVNF, subdermal vascular network skin graft and the traditional random flap were created respectively. Tissue hyalinization technique was used to find out the differences of vascular architecture between the three groups at the 1st-7th day, and the 14th day postoperatively. RESULTS The results showed that the blood supply reestablished earlier in SVNF group than the other two groups. CONCLUSION There is a zone of rapid and intensive angiogenesis in the mid-part of SVNF known as "intermediary pedicle". This is the anatomic basis of the early pedicle division and superior survival ratio of SVNF.
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Affiliation(s)
- W Huang
- Plastic Surgery Hospital, BaDaChu, Beijing 100041, PR China
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Xiu Z, Gu C, Yuan Y, Gu T, Yan D, Zhang Z. [Cardiac metal foreign body: analysis of 21 cases]. Zhonghua Wai Ke Za Zhi 1999; 37:749-50. [PMID: 11829944] [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 improve early diagnosis and clinical treatment of metal foreign body in the heart. METHODS In 21 patients, case history, clinical manifestation, chest X-ray film, and echocardiograph were reviewed. 20 patients received operation: emergency exploration (13) and elective operation (7). Four patients were subjected to cardiopulmonary bypass. The other one was not operated on because of absence of symptoms and small foreign body. Foreign bodies mostly bullets, were usually located in the right ventricle. Ventricular fibrillation occurred in 3 patients during operation, two of them were resuscitated. RESULTS 20 patients but one recovered, a mortality rate of 5%. CONCLUSIONS Early diagnosis, rapid management, and localization of foreign body are essential to the selection of treatment.
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Affiliation(s)
- Z Xiu
- Department of Cardiac Surgery, First Affiliated Hospital, China Medical University, Shenyang 110001
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14
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Xiu Z, Cheng Y, Hong Q. [Study on cross-linked capillary columns coated with polyphenylenesiloxane]. Se Pu 1997; 15:428-30. [PMID: 15739498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023] Open
Abstract
A new type of cross-linked capillary column coated with polyphenylenesiloxane which possesses phenylene in the siloxane main chain has been described in this paper. The cross-linking of polyphenylenesiloxane was performed in situ by the induction of DCUP. The structure of polyphenylenesiloxane is as followed: [structure: see text] The repeatabilities and solvent inextractabilities of the column preparations were investigated. For decane and 1-octanol, the values of n/L and k' at 120 degrees C were 2800-3100 and 1.0-1.3, 2400-2800 and 5.0-6.0, respectively. The k' values of the columns scarcely changed after eluting with methylene chloride and pentane. The base-acid property was studied by analyzing 2,6-dimethylphenol and 2,6-dimethylaniline. Besides, in comparision with OV-17 and OV-25, the McReynolds' constants of the cross-linked column were also determined. The advantages of this kind of column are summarized as (1) easy preparation; (2) heat stability improved; and (3) good selectivity for the organic compounds which contain halogen, nitro group or phenol.
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Affiliation(s)
- Z Xiu
- Dalian Institute of Chemical Physics, the Chinese Academy of Sciences, Dalian, 116012
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15
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Song Y, Xiu Z, Zhang Z. [Experimental study on the effects of FGF on the changes in vascular architecture of subdermal vascular plexus of the thin skin flap]. Zhonghua Zheng Xing Shao Shang Wai Ke Za Zhi 1996; 12:323-5. [PMID: 9387441] [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: 02/05/2023]
Abstract
In this experimental study, eight rabbits were used to investigate the survival mechanism of subdermal vascular plexus thin skin flap. By histological, immunohistochemical and microcirculatory observation, we found that the vascular architecture of different parts of the flap had great dissimilarity: the vascular architecture of the proximal part was same as that of normal skin, the middle one showed extremely active angiogenesis, and the distal part also showed angiogenesis but in medium level. We conclude that the middle part of the flap works as an "intermediary pedicle", and is the basis of the early pedicle division and superior survival ratio of the flap. The fibroblast growth factor (FGF) plays an important role in the changes in vascular architecture of the flap.
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Affiliation(s)
- Y Song
- Plastic Surgery Hospital, Chinese Academy of Medical Sciences, Beijing
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16
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Xiu Z, Chen Z, Chen M. [Clinical study of the venous flaps]. Zhonghua Zheng Xing Shao Shang Wai Ke Za Zhi 1995; 11:179-80. [PMID: 8732022] [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: 02/01/2023]
Abstract
Seven venous flaps were used clinically. Of them six flaps survived completely, one saphenous venous flap had partial necrosis of the derma. The size of the largest survived flap was 5 cm x 15 cm. Three principles regarding the flap application were emphasized: 1) The tissue surrounding the recipient site should be normal. High venous pressure and oxygen tension in the recipient veins are needed. 2) Rich venous network and an axial vein are required in the recipient site. 3) Reliable fixation of the flap is necessary to avoid any damage to new blood vessels.
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Affiliation(s)
- Z Xiu
- Plastic Surgery Hospital, CAMS, BaDaChu, Beijing
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17
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Xiu Z, Chen Z, Zhou J. [Experimental study of carbohydrate metabolism of venous flaps]. Zhonghua Zheng Xing Shao Shang Wai Ke Za Zhi 1994; 10:262-4. [PMID: 7834538] [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: 01/27/2023]
Abstract
In this experimental study, three sorts of grafts (venous flap, composite graft and axial flap) were created. According to the results of relative contents of LD1, and LD5 in these grafts, the conclusion was drawn: Oxyhemoglobin remaining in the grafts maintained normal carbohydrate metabolism within 24 hours postoperatively. 48 hours later, aerobic oxidation of carbohydrate abated but kept in a considerable level in venous flaps due to the existence of venous blood. 72 hours after the operation, aerobic oxidation of carbohydrate in venous flaps reached its lowest point. At this point, the venous flaps would necrose gradually unless a new nourishing source be obtained. From the 4th postoperative day, aerobic oxidation of carbohydrate of venous flaps began to increase. By the 7th day, aerobic oxidation of carbohydrate of venous flabs returned to normal.
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Affiliation(s)
- Z Xiu
- Plastic Surgery Hospital, Chinese Academy of Medical Sciences, Beijing
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Xiu Z, Chen Z. [Experimental study of mechanism of survival of venous flaps]. Zhonghua Zheng Xing Shao Shang Wai Ke Za Zhi 1994; 10:169-172. [PMID: 7834516] [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: 05/22/2023]
Abstract
The mechanism of survival of venous flaps was studied by observations employed in the study of microcirculation and blood vessel perfusion in rabbits. Initially, the flap was nourished by venous blood (within 72 hours): venous blood flowed slowly from the principal vein to its tributary veins, and then through the venous anastomoses (including small venous anastomoses, venular anastomoses and terminal venule anastomoses), reaching other tributary veins. No backflow from venules into capillaries was seen. The second stage was arterial nourishing and vessel reconstructive period (72 hours to 6 weeks): new vessels began to grow into the flaps at 72 hours postoperatively. 4 days postoperation, arterial flow with low velocity appeared in the primary flap arteries and the backflow of venous blood disappeared. 7 days postoperation, the abnormal, flow in 'unphysiologic' channels was replaced by the normal flow in 'physiologic' channels completely. 6 weeks postoperation, the vessel structure of venous flaps was the same as that of normal skin. These results suggested that rich venous network in venous flaps and early invasion of new blood vessels are the mainstay of venous flaps survival.
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Affiliation(s)
- Z Xiu
- Plastic Surgery Hospital, Chinese Academy of Medical Sciences, Beijing
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Xiu Z, Song Y. [Transplantation of a minute artery to bridge over the defect of an artery of significantly larger calibre. An experimental study]. Zhonghua Zheng Xing Shao Shang Wai Ke Za Zhi 1994; 10:98-100. [PMID: 7922823] [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: 05/22/2023]
Abstract
Based on our clinical experience for years of "unequal bite" suturing technique to perform end-to-end anastomosis of vessels with great discrepancy in diameter, the animal experimental study was carried out. An artery defect, 1.0-1.4 mm in diameter, was reunited with, an autogenous arterial graft of 0.3-0.4 mm in diameter. A high patency rate (96% in total) was obtained postoperatively. Histological examination by light microscope and scanning electron microscope showed that the unequal bite suturing technique can produce very smooth anastomotic junction and the minute arterial grafts healed well on a large artery. The unequal bite suturing technique is a very valuable development of the basic end-to-end anastomotic technique. A small autogenous arterial graft may be used to repair defect of an artery with large calibre clinically.
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Affiliation(s)
- Z Xiu
- Plastic Surgery Hospital of Chinese Academy of Medical Sciences
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