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Liu T, Hou K, Li J, Han T, Liu S, Wei J. Alzheimer's Disease and Aging Association: Identification and Validation of Related Genes. J Prev Alzheimers Dis 2024; 11:196-213. [PMID: 38230733 DOI: 10.14283/jpad.2023.101] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2024]
Abstract
BACKGROUND Aging is considered a key risk factor for Alzheimer's disease (AD). This study aimed to identify and validate potential aging-related genes associated with AD using bioinformatics analysis. METHODS Datasets GSE36980 and GSE5281 were selected to screen differentially expressed genes (DEGs), and the immune cell correlation analysis and GSEA analysis of DEGs were performed. The intersection with senescence genes was taken as differentially expressed senescence-related genes (DESRGs), and the GSE44770 dataset was used for further validation. The potential biological functions and signaling pathways were determined by GO and KEGG, and the hub genes were identified by 12 algorithms in Cytohubba. The expression of 10 hub genes in different brain regions was determined and single-cell sequencing analysis was performed, and diagnostic genes were further screened by gene expression and receiver operating characteristic (ROC) curve. Finally, a miRNA-gene network of diagnostic genes was constructed and targeted drug prediction was performed. RESULTS A total of 2137 DEGs were screened from the GSE36980 and GSE5281 datasets, and 278 SRGs were identified from the CellAge database. The overlapping DEGs and SRGs constituted 29 DESRGs, including 14 senescence suppressor genes and 15 senescence inducible genes. The top 10 hub genes, including MDH1, CKB, PSMD14, SMARCA4, PEBP1, DDB2, ITPKB, ATF7IP, YAP1, and EWSR1 were screened. Furthermore, four diagnostic genes were identified: PMSD14, PEBP1, ITPKB, and ATF7IP. The ROC analysis showed that the respective area under the curves (AUCs) of PMSD14, PEBP1, ITPKB, and ATF7IP were 0.732, 0.701, 0.747, and 0.703 in the GSE36980 dataset and 0.870, 0.817, 0.902, and 0.834 in the GSE5281 dataset. In the GSE44770 dataset, PMSD14 (AUC, 0.838) and ITPKB (AUC, 0.952) had very high diagnostic values in the early stage of AD. Finally, based on these diagnostic genes, we found that the drug Abemaciclib is a targeted drug for the treatment of age-related AD. Flutamide can aggravate aging-related AD. CONCLUSION The results of this study suggest that cellular SRGs might play an important role in AD. PMSD14, PEBP1, ITPKB, and ATF7IP have the potential as specific biomarkers for the early diagnosis of AD.
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Affiliation(s)
- T Liu
- Professor Jianshe Wei, M.D., Ph.D., Institute for Brain Sciences Research, School of Life Sciences, Henan University, Kaifeng 475004, China
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Abstract
Lots of studies have demonstrated that anterior cingulate cortex plays important roles in the pain perception and pain modulation. The present study explored the role of mu-opioid receptor in nociceptive modulation in anterior cingulate cortex of rats with neuropathic pain. Neuropathic pain model was set up by chronic constriction injury of the left sciatic nerve of rats. The hindpaw withdrawal latency to thermal and mechanical stimulation, by hot plate and Randall Selitto Test respectively, was used to evaluate the rat’s responses to noxious stimulation. Results showed that intra-anterior cingulate cortex injection of morphine could induce the antinociception dose-dependently. By intra-anterior cingulate cortex injection of opioid receptor antagonist, the morphine-induced antinociception could be attenuated by naloxone, as well as much significantly by the selective mu-opioid receptor antagonist β-funaltrexamine, indicating that mu-opioid receptor is involved in the morphine-induced antinociception in anterior cingulate cortex of rats with neuropathic pain. The morphine-induced antinociception was much more decreased in rats with neuropathic pain than that in normal rats, and there was a significant decrease in mu-opioid receptor messenger RNA levels in anterior cingulate cortex of rats with neuropathic pain, indicating that there may be a down-regulation in mu-opioid receptor expression in anterior cingulate cortex of rats with neuropathic pain. To further confirm the role of mu-opioid receptor in morphine-induced antinociception in anterior cingulate cortex, normal rats were received intra-anterior cingulate cortex administration of small interfering RNA targeting mu-opioid receptor and it was found that there was a down-regulation in mu-opioid receptor messenger RNA levels, as well as a down-regulation in mu-opioid receptor expression in anterior cingulate cortex tested by real-time polymerase chain reaction and western blotting. Furthermore, the morphine-induced antinociceptive effect decreased significantly in rats with small interfering RNA targeting mu-opioid receptor, which indicated that knockdown mu-opioid receptor in anterior cingulate cortex could also attenuate morphine-induced antinociceptive effect. These results strongly suggest that mu-opioid receptor plays a significant role in nociceptive modulation in anterior cingulate cortex of rats.
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Affiliation(s)
- Linlin Wang
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai, P.R. China
| | - Kesai Hou
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai, P.R. China
| | - Hongbo Wang
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai, P.R. China
| | - Fenghua Fu
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai, P.R. China
| | - Longchuan Yu
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai, P.R. China.,Neurobiology Laboratory, College of Life Sciences, Peking University, Beijing, P.R. China
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CHe X, Zhang Y, Qu X, Guo T, Ma Y, Li C, Fan Y, Hou K, Cai Y, Yu R, Zhou H, He X, Wu H, Liu Y, Xu L. The E3 ubiquitin ligase Cbl-b inhibits tumor growth in multidrug-resistant gastric and breast cancer cells. Neoplasma 2019; 64:887-892. [PMID: 28895413 DOI: 10.4149/neo_2017_610] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Most receptor tyrosine kinases (RTKs) contribute to tumor growth, and their ubiquitination and degradation is related to the inhibition of tumor growth. Our previous study showed that the ubiquitin ligase Cbl-b was expressed at low levels in multidrug-resistant (MDR) gastric cancer cells compared with their parental cells. However, whether enhancement of Cbl-b expression in MDR cancer cells could prevent tumor proliferation via ubiquitination and degradation of RTK remains unclear. In the present study, Cbl-b overexpression reduced cell proliferation in MDR gastric and breast cancer cells, and effectively inhibited tumor growth in vivo. Additionally, Cbl-b overexpression reduced the total protein level of insulin-like growth factor 1 (IGF-1R), an important member of the RTK family. Moreover, Cbl-b overexpression promoted interaction of Cbl-b with IGF-1R, and induced ubiquitination and degradation of IGF-1R and inactivation of the IGF-1R pathway. These results suggest that the ubiquitin ligase Cbl-b inhibited tumor growth via ubiquitination and degradation of IGF-1R in MDR gastric and breast cancer cells.
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Wang T, Fu F, Lv H, Huang Y, Lu Y, Hou K, Zhang L. Effects of Rotigotine Extended‐release Microspheres Therapy on Myocardial Ischemia Injury in Mice. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.817.5] [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: 11/11/2022]
Affiliation(s)
- Tian Wang
- School of PharmacyYantai UniversityYantaiPeople's Republic of China
| | - Fenghua Fu
- School of PharmacyYantai UniversityYantaiPeople's Republic of China
| | - Huaiyou Lv
- School of PharmacyYantai UniversityYantaiPeople's Republic of China
| | - Yanan Huang
- School of PharmacyYantai UniversityYantaiPeople's Republic of China
| | - Yongying Lu
- School of PharmacyYantai UniversityYantaiPeople's Republic of China
| | - Kesai Hou
- School of PharmacyYantai UniversityYantaiPeople's Republic of China
| | - Leiming Zhang
- School of PharmacyYantai UniversityYantaiPeople's Republic of China
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Pan H, Palekar R, Hou K, Bacon J, Yan H, Springer L, Akk A, Pham C, Schlesinger P, Wickline S. P1273JNK-2 silencing with focally acting peptide-siRNA nanostructures modulates plaque inflammation in atherosclerotic mice. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p1273] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- H Pan
- University of South Florida, The Heart Institute, Tampa, United States of America
| | - R Palekar
- Washington University School of Medicine, St. Louis, United States of America
| | - K Hou
- Washington University School of Medicine, St. Louis, United States of America
| | - J Bacon
- Washington University School of Medicine, St. Louis, United States of America
| | - H Yan
- Washington University School of Medicine, St. Louis, United States of America
| | - L Springer
- Washington University School of Medicine, St. Louis, United States of America
| | - A Akk
- Washington University School of Medicine, St. Louis, United States of America
| | - C Pham
- Washington University School of Medicine, St. Louis, United States of America
| | - P Schlesinger
- Washington University School of Medicine, St. Louis, United States of America
| | - S Wickline
- University of South Florida, The Heart Institute, Tampa, United States of America
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Zhang S, Zhang Y, Qu J, Che X, Fan Y, Hou K, Guo T, Deng G, Song N, Li C, Wan X, Qu X, Liu Y. Exosomes promote cetuximab resistance via the PTEN/Akt pathway in colon cancer cells. ACTA ACUST UNITED AC 2017; 51:e6472. [PMID: 29160412 PMCID: PMC5685060 DOI: 10.1590/1414-431x20176472] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2017] [Accepted: 09/05/2017] [Indexed: 12/11/2022]
Abstract
Cetuximab is widely used in patients with metastatic colon cancer expressing wildtype KRAS. However, acquired drug resistance limits its clinical efficacy. Exosomes are nanosized vesicles secreted by various cell types. Tumor cell-derived exosomes participate in many biological processes, including tumor invasion, metastasis, and drug resistance. In this study, exosomes derived from cetuximab-resistant RKO colon cancer cells induced cetuximab resistance in cetuximab-sensitive Caco-2 cells. Meanwhile, exosomes from RKO and Caco-2 cells showed different levels of phosphatase and tensin homolog (PTEN) and phosphor-Akt. Furthermore, reduced PTEN and increased phosphorylated Akt levels were found in Caco-2 cells after exposure to RKO cell-derived exosomes. Moreover, an Akt inhibitor prevented RKO cell-derived exosome-induced drug resistance in Caco-2 cells. These findings provide novel evidence that exosomes derived from cetuximab-resistant cells could induce cetuximab resistance in cetuximab-sensitive cells, by downregulating PTEN and increasing phosphorylated Akt levels.
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Affiliation(s)
- S Zhang
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
| | - Y Zhang
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
| | - J Qu
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
| | - X Che
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
| | - Y Fan
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
| | - K Hou
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
| | - T Guo
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
| | - G Deng
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
| | - N Song
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
| | - C Li
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
| | - X Wan
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
| | - X Qu
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
| | - Y Liu
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
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Liu RY, Hou K, Hou ZH, Yang SM. [Analysis of the diagnosis and treatment of cerebrospinal fluid otorrhea]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2016; 30:627-629; 632. [PMID: 29871093 DOI: 10.13201/j.issn.1001-1781.2016.08.011] [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] [Subscribe] [Scholar Register] [Received: 11/01/2015] [Indexed: 11/12/2022]
Abstract
Objective:To analyze the etiology and clinical symptoms and to investigate the therapeutic strategies of cerebrospinal fluid otorrhea. Method:A retrospective analysis of 37 cases of patients with cerebrospinal fluid otorrhea.The clinical symptoms, auxiliary examination, intraoperative findings, surgical methods and postoperative follow-up were analyzed. Result:In 37 cases, 35 patients underwent the plugging surgery once and cured, 1 patient with inner ear malformation underwent another operation and cured, 1 patient didn't have the operation. No cerebrospinal fluid leakage or meningitis recurrence was reported by the followed up from 1 months to 7 years after operation. Conclusion:Surgical repair is an effective method to treat the cerebrospinal fluid otorrhea. It is significant to take appropriate surgical approach to expose and to find the leak, according to the etiological factor and imaging examination.
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Affiliation(s)
- R Y Liu
- Department of Otolaryngology Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, 100853, China
| | - K Hou
- Department of Otolaryngology Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, 100853, China
| | - Z H Hou
- Department of Otolaryngology Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, 100853, China
| | - S M Yang
- Department of Otolaryngology Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, 100853, China
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Guan LL, Wu W, Hu B, Li D, Chen JW, Hou K, Wang L. Devolopmental and growth temperature regulation of omega-3 fatty acid desaturase genes in safflower (Carthamus tinctorius L.). Genet Mol Res 2014; 13:6623-37. [PMID: 25177943 DOI: 10.4238/2014.august.28.7] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Three ω-3 fatty acid desaturase genes (CtFAD3, CtFAD7, and CtFAD8) were isolated from safflower (Carthamus tinctorius L.). Transcript analysis showed that the highest transcript levels were detected for CtFAD3 and the low transcript levels were detected for CtFAD7 and CtFAD8 in flowers. This result indicates that CtFAD3 enzyme activity is important for fatty acid desaturation in flowers. The low transcript level of CtFAD3 in developing seeds was consistent with the recorded high level of linoleic acid (18:2) and lack of linolenic acid (18:3) in safflower seed oil. At low temperatures, the induced transcription levels of ω-3 fatty acid desaturase genes in the stems and petioles were consistent with increased polyunsaturated fatty acids (PUFAs). In the roots, ω-3 fatty acid desaturase noticeably increased at low temperatures, whereas PUFA levels decreased. Interestingly, C18:3(Δ9,12,15) alcohol was specifically found in safflower roots, and showed a significant increase, indicating a flux in the acid to alcohol ratio of this compound in safflower roots.
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Affiliation(s)
- L-L Guan
- Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences / Key Laboratory of Crop Gene Resources and Germplasm Enhancement in Southern China, Ministry of Agriculture, China
| | - W Wu
- Agronomy College, Sichuan Agricutural University, Cheng Du, China
| | - B Hu
- Agronomy College, Sichuan Agricutural University, Cheng Du, China
| | - D Li
- Agronomy College, Sichuan Agricutural University, Cheng Du, China
| | - J-W Chen
- Agronomy College, Sichuan Agricutural University, Cheng Du, China
| | - K Hou
- Agronomy College, Sichuan Agricutural University, Cheng Du, China
| | - L Wang
- Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences / Key Laboratory of Crop Gene Resources and Germplasm Enhancement in Southern China, Ministry of Agriculture, China
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Qu X, Zhang L, Teng Y, Zhang Y, Liu J, Xu L, Qu J, Hou K, Yang X, Liu Y. Prognostic value of expression of RANK and c-Src in patients with breast cancer with bone metastasis. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.e21024] [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: 11/20/2022] Open
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Iuchi H, Watanabe Y, Hashimoto H, Fijisawa M, Saga Y, Hou K, Tsurukawa H. UP-2.191: Urodynamic Evaluations of Silodosin, a Novel Selective α-1a Adrenoceptor Blocker, for Treatment of Benign Prostatic Hyperplasia. Urology 2009. [DOI: 10.1016/j.urology.2009.07.410] [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: 10/20/2022]
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Hou K. Preparation of thin and highly stable Pd/Ag composite membranes and simulative analysis of transfer resistance for hydrogen separation. J Memb Sci 2003. [DOI: 10.1016/s0376-7388(02)00525-2] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Hou K, Hughes R. The effect of external mass transfer, competitive adsorption and coking on hydrogen permeation through thin Pd/Ag membranes. J Memb Sci 2002. [DOI: 10.1016/s0376-7388(01)00770-0] [Citation(s) in RCA: 100] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Hou K, Hughes R, Ramos R, Menéndez M, Santamarı́a J. Corrigendum to: “Simulation of a membrane reactor for oxidative dehydrogenation of propane, incorporating radial concentration and temperature profiles”. Chem Eng Sci 2002. [DOI: 10.1016/s0009-2509(02)00151-3] [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: 10/27/2022]
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Hou K, Hughes R, Ramos R, Menéndez M, Santamarı́a J. Simulation of a membrane reactor for oxidative dehydrogenation of propane, incorporating radial concentration and temperature profiles. Chem Eng Sci 2001. [DOI: 10.1016/s0009-2509(00)00422-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [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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Hou K, Fowles M, Hughes R. Potential catalyst deactivation due to hydrogen removal in a membrane reactor used for methane steam reforming. Chem Eng Sci 1999. [DOI: 10.1016/s0009-2509(99)00085-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Hou K, Fowles M, Hughes R. Effective Diffusivity Measurements on Porous Catalyst Pellets at Elevated Temperature and Pressure. Chem Eng Res Des 1999. [DOI: 10.1205/026387699525873] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Abstract
The effects of positively charged nylon and depth (cellulose-diatomaceous earth) filters on endotoxin removal from various solutions were evaluated. The charged filter media removed significant amounts of Escherichia coli and natural endotoxin from tap water, distilled water, sugars, and NaCl solutions; no significant removal of endotoxin was observed with negatively charged filter media. The extent of removal was influenced by pH, the presence of salts, and organic matter. Such media may be useful for the control of endotoxins in raw-product water or solutions used to prepare parenteral drug products or in other fluids where endotoxin control is desired.
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Abstract
This report demonstrates how electropositive filters can be used to enhance the removal of microorganisms and other negatively charged particles from water. It was shown that electropositive depth filters were capable of adsorbing viruses and endotoxins many times smaller than the average pore size of the filter. Electronegative filters of similar porosity or electropositive filters that had been treated to destroy the positive charge were almost ineffective under similar conditions for the removal of viruses and small latex spheres. The results of this study indicate that electropositive filters are highly effective in the removal of a wide range of contaminants over a wide range of pH values and ionic conditions.
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