126
|
Rodriguez J, Vernus B, Chelh I, Cassar-Malek I, Gabillard JC, Hadj Sassi A, Seiliez I, Picard B, Bonnieu A. Myostatin and the skeletal muscle atrophy and hypertrophy signaling pathways. Cell Mol Life Sci 2014; 71:4361-71. [PMID: 25080109 PMCID: PMC11113773 DOI: 10.1007/s00018-014-1689-x] [Citation(s) in RCA: 259] [Impact Index Per Article: 25.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2014] [Revised: 07/16/2014] [Accepted: 07/17/2014] [Indexed: 12/16/2022]
Abstract
Myostatin, a member of the transforming growth factor-β superfamily, is a potent negative regulator of skeletal muscle growth and is conserved in many species, from rodents to humans. Myostatin inactivation can induce skeletal muscle hypertrophy, while its overexpression or systemic administration causes muscle atrophy. As it represents a potential target for stimulating muscle growth and/or preventing muscle wasting, myostatin regulation and functions in the control of muscle mass have been extensively studied. A wealth of data strongly suggests that alterations in skeletal muscle mass are associated with dysregulation in myostatin expression. Moreover, myostatin plays a central role in integrating/mediating anabolic and catabolic responses. Myostatin negatively regulates the activity of the Akt pathway, which promotes protein synthesis, and increases the activity of the ubiquitin-proteasome system to induce atrophy. Several new studies have brought new information on how myostatin may affect both ribosomal biogenesis and translation efficiency of specific mRNA subclasses. In addition, although myostatin has been identified as a modulator of the major catabolic pathways, including the ubiquitin-proteasome and the autophagy-lysosome systems, the underlying mechanisms are only partially understood. The goal of this review is to highlight outstanding questions about myostatin-mediated regulation of the anabolic and catabolic signaling pathways in skeletal muscle. Particular emphasis has been placed on (1) the cross-regulation between myostatin, the growth-promoting pathways and the proteolytic systems; (2) how myostatin inhibition leads to muscle hypertrophy; and (3) the regulation of translation by myostatin.
Collapse
|
127
|
An E, Liao W, Thyparambil S, Rodriguez J, Salgia R, Wistuba I, Burrows J, Hembrough T. 489 Development and clinical validation of a quantitative mass spectrometric assay for PD-L1 protein in FFPE NSCLC samples. Eur J Cancer 2014. [DOI: 10.1016/s0959-8049(14)70615-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
128
|
Cardona A, Jimenez E, Hakim F, Useche N, Bermudez S, Arrieta O, Behaine J, Rodriguez J, Carranza H, Otero J, Vargas C, Rojas L, Ortiz LD. BI-05 * MOLECULAR PROFILING OF LOW GRADE GLIOMAS (LGG) IN COLOMBIA (ONCOLGROUP). Neuro Oncol 2014. [DOI: 10.1093/neuonc/nou239.5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
129
|
Jia J, Richards DJ, Pollard S, Tan Y, Rodriguez J, Visconti RP, Trusk TC, Yost MJ, Yao H, Markwald RR, Mei Y. Engineering alginate as bioink for bioprinting. Acta Biomater 2014. [PMID: 24998183 DOI: 10.1016/j.actbio.2014.06] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
Abstract
Recent advances in three-dimensional (3-D) printing offer an excellent opportunity to address critical challenges faced by current tissue engineering approaches. Alginate hydrogels have been used extensively as bioinks for 3-D bioprinting. However, most previous research has focused on native alginates with limited degradation. The application of oxidized alginates with controlled degradation in bioprinting has not been explored. Here, a collection of 30 different alginate hydrogels with varied oxidation percentages and concentrations was prepared to develop a bioink platform that can be applied to a multitude of tissue engineering applications. The authors systematically investigated the effects of two key material properties (i.e. viscosity and density) of alginate solutions on their printabilities to identify a suitable range of material properties of alginates to be applied to bioprinting. Further, four alginate solutions with varied biodegradability were printed with human adipose-derived stem cells (hADSCs) into lattice-structured, cell-laden hydrogels with high accuracy. Notably, these alginate-based bioinks were shown to be capable of modulating proliferation and spreading of hADSCs without affecting the structure integrity of the lattice structures (except the highly degradable one) after 8days in culture. This research lays a foundation for the development of alginate-based bioink for tissue-specific tissue engineering applications.
Collapse
|
130
|
Dautruche A, Bolle S, Feuvret L, Deberne M, Jouffroy T, Zefkili S, Nauraye C, Herman P, Rodriguez J, Calugaru V. Traitement des carcinomes adénoïdes kystiques sinonasaux localement évolués par irradiation hautement conformationnelle (protonthérapie et tomothérapie). Cancer Radiother 2014. [DOI: 10.1016/j.canrad.2014.07.127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
131
|
Jia J, Richards DJ, Pollard S, Tan Y, Rodriguez J, Visconti RP, Trusk TC, Yost MJ, Yao H, Markwald RR, Mei Y. Engineering alginate as bioink for bioprinting. Acta Biomater 2014; 10:4323-31. [PMID: 24998183 PMCID: PMC4350909 DOI: 10.1016/j.actbio.2014.06.034] [Citation(s) in RCA: 304] [Impact Index Per Article: 30.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Revised: 06/06/2014] [Accepted: 06/20/2014] [Indexed: 10/25/2022]
Abstract
Recent advances in three-dimensional (3-D) printing offer an excellent opportunity to address critical challenges faced by current tissue engineering approaches. Alginate hydrogels have been used extensively as bioinks for 3-D bioprinting. However, most previous research has focused on native alginates with limited degradation. The application of oxidized alginates with controlled degradation in bioprinting has not been explored. Here, a collection of 30 different alginate hydrogels with varied oxidation percentages and concentrations was prepared to develop a bioink platform that can be applied to a multitude of tissue engineering applications. The authors systematically investigated the effects of two key material properties (i.e. viscosity and density) of alginate solutions on their printabilities to identify a suitable range of material properties of alginates to be applied to bioprinting. Further, four alginate solutions with varied biodegradability were printed with human adipose-derived stem cells (hADSCs) into lattice-structured, cell-laden hydrogels with high accuracy. Notably, these alginate-based bioinks were shown to be capable of modulating proliferation and spreading of hADSCs without affecting the structure integrity of the lattice structures (except the highly degradable one) after 8days in culture. This research lays a foundation for the development of alginate-based bioink for tissue-specific tissue engineering applications.
Collapse
|
132
|
Martin Romano P, Buil N, Arbea L, Fusco J, Castanon Alvarez E, Zubiri L, Ceniceros L, Subtil J, Chopitea A, Hernandez-Lizoain J, Rodriguez J. Induction Chemotherapy, Chemo-Radiotherapy and Surgery in Locally Advanced Gastric Cancer (Gc) Patients: Long Term Results from a Single Institution. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu334.30] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
133
|
Martin Romano P, Arbea L, Zubiri L, Subtil J, Chopitea A, Fusco J, Legaspi J, Hernandez-Lizoain J, Ceniceros L, Castanon Alvarez E, Rodriguez J. Induction Chemotherapy Followed By Chemoradiotherapy in Locally Advanced Esophagogastric Adenocarcinoma. Has the Location of the Primary Tumor Any Influence on Patients' Outcome? a Retrospective Analysis. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu334.29] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
134
|
Fusco J, Subtil J, Buil N, Chopitea A, Castanon Alvarez E, Martín P, Arbea L, Zubiri L, Carranza Rua O, Pardo F, Rodriguez J. A Three-Step Strategy of Induction Chemotherapy, Chemo-Radiotherapy and Surgery in Locally Advanced Pancreatic Cancer (Lapc) Patients. Role of a Nonlinear Mixed Effects Modeling to Predict Outcome. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu334.97] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
135
|
Gurpide A, Lopez-Picazo J, Alfaro C, RodrÍguez-Ruiz M, Perez Gracia J, Fernandez de Sanmamed M, Benito A, Cano D, Gonzalez A, Rodriguez Lopez I, Fusco J, Rodriguez J, Martin Algarra S, Martínez-Monge R, Melero I. Phase Ii Study with Immunotherapy with Dendritic Cells (Dc) Combined with Intratumoral Hiltonol in Patients with Advanced Cancer. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu342.31] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
136
|
Rodriguez J, Vera R, Pardo F, Herrera J, Chopitea A, Alfaro C, Hernández García I, Garzón C, Viudez Berral A, Benito A, Gonzalez A, RodrÍguez-Ruiz M, Fernandez de Sanmamed M, Fusco J, Oñate C, Ochoa C, Melero I, Perez Gracia J. Randomized Phase Ii Trial with Dendritic Cell (Dc) Immunotherapy in Patients with Colorectal Carcinoma and Liver Metastasis Following Complete Resection and Adjuvant Chemotherapy. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu342.29] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
137
|
Halasz M, Santra T, Rodriguez J, Kholodenko B, Kolch W. 533: Proteomic profiling of N-Myc-associated proteins in neuroblastoma. Eur J Cancer 2014. [DOI: 10.1016/s0959-8049(14)50493-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
138
|
Subramaniam R, Shanthalingam S, Bavananthasivam J, Kugadas A, Raghavan B, Batra SA, Herndon CN, Rodriguez J, Tibary A, Nelson D, Potter KA, Foreyt WJ, Srikumaran S. Bighorn sheep × domestic sheep hybrids survive Mannheimia haemolytica challenge in the absence of vaccination. Vet Microbiol 2014; 170:278-83. [PMID: 24629771 DOI: 10.1016/j.vetmic.2014.01.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2013] [Revised: 01/15/2014] [Accepted: 01/24/2014] [Indexed: 10/25/2022]
Abstract
Bighorn sheep (BHS, Ovis canadensis) are much more susceptible than domestic sheep (DS, Ovis aries) to pneumonia caused by leukotoxin (Lkt)-producing members of the Family Pasteurellaceae, particularly Mannheimia haemolytica and Bibersteinia trehalosi. Leukotoxin is widely accepted as the critical virulence factor of these bacteria since Lkt-negative mutants do not cause death of BHS. Typically, DS carry Lkt-positive M. haemolytica and/or B. trehalosi as commensal bacteria in their nasopharynx. In contrast, most BHS do not carry Lkt-positive M. haemolytica or B. trehalosi, or carry Lkt-negative strains in their nasopharynx. In previous studies, we demonstrated that unimmunized DS resist M. haemolytica challenge while BHS succumb to it. We hypothesized that Lkt-neutralizing antibodies, induced by Lkt-positive M. haemolytica and/or B. trehalosi innately carried by DS in their nasopharynx, render them less susceptible to infection by these bacteria. In this study we developed BHS×DS F1 hybrids by artificial insemination of domestic ewes with BHS semen. F1 hybrids were fertile, and produced F2 hybrids and back-crosses. The F1, F2, and back-crosses were raised together with domestic ewes. All these animals acquired Lkt-positive M. haemolytica and/or B. trehalosi, and developed high titers of Lkt-neutralizing antibodies in the absence of vaccination. Furthermore, all of these animals resisted challenge with lethal dose of M. haemolytica. These results suggest that lack of previous exposure to Lkt is at least partially responsible for fatal pneumonia in BHS when they acquire Lkt-positive M. haemolytica and/or B. trehalosi from DS when the two species commingle.
Collapse
|
139
|
|
140
|
|
141
|
Gόmez-Centeno A, Martínez O, Ballina F, Rodriguez J, Graña J, Brito M, Sampedro J, Iglesias G, Delgado C, Monteagudo I. FRI0293 Characteristics of Patients with Rheumatoid Arthritis Treated with Biologic Therapy as Monotherapy. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.4913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
142
|
Patricia MR, Aldaz A, Fusco J, Sola J, Chopitea A, Subtil J, Solorzano J, Pardo F, Arbea L, Garzon C, Rotellar F, Zufia L, Rodriguez J. A Retrospective Analysis of Oxaliplatin, Irinotecan and PK-Adjusted 5-Fluorouracil Within a Neoadjuvant Multidisciplinary Approach in Locally Advanced Pancreatic Cancer (LAPC) Patients. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu165.109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
143
|
Fusco J, Patricia MR, Aldaz A, Baixauli J, Subtil J, Hernandez-Lizoain J, Zufia L, Rodriguez J, Sola J, Solorzano J, Garzon C, Chopitea A. A Retrospective Analysis of Preoperative Folfox Chemotherapy for Locally Advanced Colon Cancer Patients with Pharmacokinetic-Guided Dose Adjustements of 5-FU: Preliminary Results. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu165.220] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
144
|
Lombardi R, Rosa-Diez G, Ferreiro A, Greloni G, Yu L, Younes-Ibrahim M, Burdmann EA, Plata-Cornejo R, Granado RCD, e Silva ACA, Naseri AP, Balbi A, Teixeira AA, Stein A, Vieira AE, de Almeida Inda AJ, Pereira B, Cortez CC, Fraga CN, Chula DC, d'Avila DO, Romao EA, de Lima E, Klaus F, Santos FRL, Barcellos FC, Herdoiza G, Dos Santos GM, Lotaif LD, Peres LAB, Yu L, Miorin LA, de Andrade MC, Vannucchi MTI, Oliveira M, Younes-Ibrahim M, Huehara M, dos Santos OP, Neto OV, de Medeiros RN, Laranja S, Sobral TD, de Castro Santos T, Dutra W, Pacheco A, Boltansky A, Cortes DES, Briones E, Quintana E, Roessler E, Goecke H, Hurtado H, Flores JC, Penaloza JC, Espinoza M, Alvarez M, Nunez M, Quintero N, Downey P, Wainstein R, Ayca V, Garces EO, Calderon MC, Almonte AF, Dominguez CC, Jimenez R, Rodriguez S, Cruz CS, Acosta DJ, Ortiz F, Vivas NM, Correa-Rotter R, Cueto-Manzano A, de Freitas Patino O, Benitez DC, Gimenez E, Brizuela R, Bobadilla SCF, Hurtado A, Kalugina A, Huaman C, Postigo C, Loza C, Maldonado E, Solis G, Sakihara G, Hernandez J, Gonzalez JL, Rodriguez J, Fiestas M, Hinojosa R, Barreto R, Ferreiro A, Operti A, Maino A, Alvarez A, Gelabert B, Szpinak B, Burgos C, Verdaguer C, Rugnitz E, Tambucho D, Gronros E, Gonzalez F, Olaizola I, Panissa J, Fernandez-Cean J, Garcia M, Mautone M, Odriozola M, Forselledo M, Andrade M, Labella M, Dibello N, Canzani O, Marchese R, Llopart T, Matonte V, Maseda C, Oteiza DU, Rumbos LO, Moreno MD. Acute kidney injury in Latin America: a view on renal replacement therapy resources. Nephrol Dial Transplant 2014; 29:1369-76. [DOI: 10.1093/ndt/gfu078] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
145
|
Zoffoli J, Rodriguez J. FRUIT TEMPERATURE AFFECTS PHYSICAL INJURY SENSITIVITY OF SWEET CHERRY DURING POSTHARVEST HANDLING. ACTA ACUST UNITED AC 2014. [DOI: 10.17660/actahortic.2014.1020.13] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
146
|
Fleta C, Guardiola C, Esteban S, Pellegrini G, Quirion D, Rodriguez J, Gomez F, Carabe-Fernández A, Lozano M. 72: First investigations of Ultra-Thin 3D silicon detectors as microdosimeters. Radiother Oncol 2014. [DOI: 10.1016/s0167-8140(15)34093-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
147
|
Hequet O, Le QH, Rodriguez J, Dubost P, Revesz D, Clerc A, Rigal D, Salles G, Coiffier B. Development of model for analysing respective collections of intended hematopoietic stem cells and harvests of unintended mature cells in apheresis for autologous hematopoietic stem cell collection. Transfus Apher Sci 2014; 50:294-302. [PMID: 24462181 DOI: 10.1016/j.transci.2013.12.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Revised: 12/09/2013] [Accepted: 12/17/2013] [Indexed: 11/29/2022]
Abstract
Hematopoietic stem cells (HSCs) required to perform peripheral hematopoietic autologous stem cell transplantation (APBSCT) can be collected by processing several blood volumes (BVs) in leukapheresis sessions. However, this may cause granulocyte harvest in graft and decrease in patient's platelet blood level. Both consequences may induce disturbances in patient. One apheresis team's current purpose is to improve HSC collection by increasing HSC collection and prevent increase in granulocyte and platelet harvests. Before improving HSC collection it seemed important to know more about the way to harvest these types of cells. The purpose of our study was to develop a simple model for analysing respective collections of intended CD34+ cells among HSC (designated here as HSC) and harvests of unintended platelets or granulocytes among mature cells (designated here as mature cells) considering the number of BVs processed and factors likely to influence cell collection or harvest. For this, we processed 1, 2 and 3 BVs in 59 leukapheresis sessions and analysed corresponding collections and harvests with a referent device (COBE Spectra). First we analysed the amounts of HSC collected and mature cells harvested and second the evolution of the respective shares of HSC and mature cells collected or harvested throughout the BV processes. HSC collections and mature cell harvests increased globally (p<0.0001) and their respective shares remained stable throughout the BV processes (p non-significant). We analysed the role of intrinsic (patient's features) and extrinsic (features before starting leukapheresis sessions) factors in collections and harvests, which showed that only pre-leukapheresis blood levels (CD34+cells and platelets) influenced both cell collections and harvests (CD34+cells and platelets) (p<0.001) and shares of HSC collections and mature unintended cells harvests (p<0.001) throughout the BV processes. Altogether, our results suggested that the main factors likely to influence intended HSC collections or unintended mature cell harvests were pre-leukapheresis blood cell levels. Our model was meant to assist apheresis teams in analysing shares of HSC collected and mature cells harvested with new devices or with new types of HSC mobilization.
Collapse
|
148
|
Rodriguez J, Blais MC, Lapointe C, Arsenault J, Carioto L, Harel J. Serologic and urinary PCR survey of leptospirosis in healthy cats and in cats with kidney disease. J Vet Intern Med 2014; 28:284-93. [PMID: 24417764 PMCID: PMC4858000 DOI: 10.1111/jvim.12287] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Revised: 10/21/2013] [Accepted: 11/21/2013] [Indexed: 01/13/2023] Open
Abstract
Background Although there is serologic evidence of exposure of cats to Leptospira spp., clinical disease is rarely reported in cats. Objective To compare the seropositivity and urinary polymerase chain reaction (PCR) status for Leptospira spp. between healthy (H) cats and cats with kidney disease (KD), to investigate the serovars potentially involved, and to evaluate potential risk factors. Animals Two hundred and forty client‐owned cats. Methods Cats were prospectively recruited and classified based on physical examination, complete blood count, serum biochemistry profile, and urinalysis (125 H and 115 KD cats). Leptospira spp. serology (titers ≥1 : 100 considered positive) and urinary PCR were performed in all cats. Data assessing risk factors, obtained from a questionnaire, were evaluated using logistic regression models. Results Seropositivity for Leptospira spp. was statistically different between groups: 7.2% (9/125) and 14.9% (17/114) in the H and KD, respectively (P = .05). The proportion of PCR‐positive cats was not. The most common serovars detected serologically were Pomona (n = 16) and Bratislava (n = 8). Risk factors for seropositivity included outdoor and hunting lifestyles (P = .03 and P < .001, respectively), the presence of another cat in the household (P < .01), and the sampling period, with the greatest number of cases identified between June and August (P =.02). Conclusions Seropositivity was significantly greater in KD cats, suggesting that the role of Leptospira spp. in KD in cats should be further investigated. The detection of urinary shedding of leptospires in several cats identifies a potential role in the transmission of the organism.
Collapse
|
149
|
Rodriguez J, Soria F, Geronazzo H, Destefanis H. α-Amylase Aspergillus oryzae Immobilized on Modified Expanded Perlite. INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING 2014. [DOI: 10.1515/ijcre-2013-0145] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The α-amylase from Aspergillus oryzae was immobilized covalently onto expanded perlite (EP) and modified EP by treatment with TiO2 (EP-TiO2), dye HE3B (EP-HE3B) polyethylene terephthalate (PET)-hydrazide (EP-PET) and magnetite (EP-magnetite). The modified EP was characterized using Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The supports were functionalized with aminopropyltriethoxysilane (APTES) and glutaraldehyde (GA). The optimum pH for free and immobilized α-amylase was 5.5. Temperature of maximum activity for free enzyme and immobilized enzyme on EP-HE3B was 50°C. The immobilized enzyme in EP-APTES this value was 55°C. The immobilized α-amylase in EP-APTES and EP-HE3B-APTES exhibited better thermostability than free enzyme. The immobilized derivatives showed moderate operational stability by retaining 50% of initial activity after seven successive reuses.
Collapse
|
150
|
Asif R, UsmaN M, Ghazaany T, Hussaini AS, Abd-Alhamced RA, Jones SMR, Noras JM, Rodriguez J. Evaluation of the angle of arrival based techniques. 2013 8TH IEEE DESIGN AND TEST SYMPOSIUM 2013. [DOI: 10.1109/idt.2013.6727085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
|