A structural study of the behavior of bumper cars compared to a system of spatially uncorrelated hard disks

2014/201

Response of a Model of CO Oxidation with CO Desorption and Diffusion to a Periodic External CO Pressure

We present a study of the dynamical behavior of a Ziff-Gulari-Barshad model with CO desorption and lateral diffusion. Depending on the values of the desorption and diffusion parameters, the system presents a discontinuous phase transition between low and high CO coverage phases. We calculate several points on the coexistence curve between these phases. Inclusion of the diffusion term produces a significant increase in the CO_2 production rate. We further applied a square-wave periodic pressure variation of the partial CO pressure with parameters that can be tuned to modify the catalytic activity. Contrary to the diffusion-free case, this driven system does not present a further enhancement of the catalytic activity, beyond the increase induced by the diffusion under constant CO pressure.Comment: 5 pages, RevTe

Mechanical properties and fire-resistance of composites with marble particles

The main aim of this work is to manufacture a composite material based on a natural material (marble) with acceptable mechanical properties and fire resistance, for being used in habitat industry as floor or wall in buildings. Marble used as raw material is the waste powder of quarry or plate manufacturing. To achieve this objective, polyester matrix composites with 50 wt.% of marble and 3 wt.% of glass fiber (short fiber or mesh) were prepared. The novelty of this study is the high percentage of ceramic material added to a polymer matrix composite and the fire resistance study. Samples were characterized mechanically through flexural test, Charpy impact test, compression test and wear resistance by pin-on-disk test. Fracture surfaces were analyzed by scanning electron microscope (SEM), and wear tracks were studied by SEM and 3D optical profilometer. Besides, samples were subjected to fire test using a Bunsen burner at 900 °C for 20 min. Sample temperature at the opposite-to-fire test side was measured with an infrared thermometer. Results show that marble improves mechanical properties of polyester and the effect of the glass fiber depends on its morphology (fiber or mesh). Fire resistance is high, and the fire goes out when the flame is turned off. Furthermore, the mesh maintains the integrity of the sample.This research received funding from the SUDOE project SOE1/P1/E307

Hyper, a Hydrogen Peroxide Sensor, Indicates the Sensitivity of the Arabidopsis Root Elongation Zone to Aluminum Treatment

Emerging evidence indicates that some reactive oxygen species (ROS), such as the superoxide anion radical and hydrogen peroxide (H2O2), are central regulators of plant responses to biotic and abiotic stresses. Thus, the cellular levels of ROS are thought to be tightly regulated by an efficient and elaborate pro- and antioxidant system that modulates the production and scavenging of ROS. Until recently, studies of ROS in plant cells have been limited to biochemical assays and the use of fluorescent probes; however, the irreversible oxidation of these fluorescent probes makes it impossible to visualize dynamic changes in ROS levels. In this work, we describe the use of Hyper, a recently developed live cell probe for H2O2 measurements in living cells, to monitor oxidative stress in Arabidopsis roots subjected to aluminum treatment. Hyper consists of a circularly permuted YFP (cpYFP) inserted into the regulatory domain of the Escherichia coli hydrogen peroxide-binding protein (OxyR), and is a H2O2-specific ratiometric, and therefore quantitative, probe that can be expressed in plant and animal cells. Now we demonstrate that H2O2 levels drop sharply in the elongation zone of roots treated with aluminum. This response could contribute to root growth arrest and provides evidence that H2O2 is involved in early Al sensing

Developmental role of the tomato Mediator complex subunit MED18 in pollen ontogeny

[EN] Pollen development is a crucial step in higher plants, which not only makes possible plant fertilization and seed formation, but also determines fruit quality and yield in crop species. Here, we reported a tomato T-DNA mutant, pollen deficient1 (pod1), characterized by an abnormal anther development and the lack of viable pollen formation, which led to the production of parthenocarpic fruits. Genomic analyses and the characterization of silencing lines proved that pod1 mutant phenotype relies on the tomato SlMED18 gene encoding the subunit 18 of Mediator multi-protein complex involved in RNA polymerase II transcription machinery. The loss of SlMED18 function delayed tapetum degeneration, which resulted in deficient microspore development and scarce production of viable pollen. A detailed histological characterization of anther development proved that changes during microgametogenesis and a significant delay in tapetum degeneration are associated with a high proportion of degenerated cells and, hence, should be responsible for the low production of functional pollen grains. Expression of pollen marker genes indicated that SlMED18 is essential for the proper transcription of a subset of genes specifically required to pollen formation and fruit development, revealing a key role of SlMED18 in male gametogenesis of tomato. Additionally, SlMED18 is able to rescue developmental abnormalities of the Arabidopsis med18 mutant, indicating that most biological functions have been conserved in both species. Significance Statement Pollination is a key development process in the life cycle of flowering plants. Genetic and molecular characterization of a tomato mutant have led to the identification of POD1 gene encoding the Mediator complex subunit MED18 whose function is required for tapetum tissue degeneration, a crucial step for pollen development. Furthermore, we show that MED18 fulfils an essential role in tomato, ensuring proper gene regulation during pollen ontogeny.This research was supported by the Spanish Ministry of Economy and Competitiveness (grants AGL2015-64991-C3-1-R, AGL2015-64991-C3-2-R, AGL2015-64991-C3-3-R, BIO2013-43098-R, BFU2016-77243-P and BIO2016-77559-R) and Junta de Andalucia (grant P12-AGR-1482).Pérez Martín, F.; Juan Yuste-Lisbona, F.; Pineda, B.; García Sogo, B.; Del Olmo, I.; Alché, JDD.; Egea, I.... (2018). Developmental role of the tomato Mediator complex subunit MED18 in pollen ontogeny. The Plant Journal. 96(2):300-315. https://doi.org/10.1111/tpj.14031S300315962Allen, B. L., & Taatjes, D. J. (2015). The Mediator complex: a central integrator of transcription. Nature Reviews Molecular Cell Biology, 16(3), 155-166. doi:10.1038/nrm3951Atarés, A., Moyano, E., Morales, B., Schleicher, P., García-Abellán, J. O., Antón, T., … Pineda, B. (2011). An insertional mutagenesis programme with an enhancer trap for the identification and tagging of genes involved in abiotic stress tolerance in the tomato wild-related species Solanum pennellii. Plant Cell Reports, 30(10), 1865-1879. doi:10.1007/s00299-011-1094-yBaulcombe, D. C. (1996). Mechanisms of Pathogen-Derived Resistance to Viruses in Transgenic Plants. The Plant Cell, 1833-1844. doi:10.1105/tpc.8.10.1833Bourbon, H.-M. (2008). Comparative genomics supports a deep evolutionary origin for the large, four-module transcriptional mediator complex. Nucleic Acids Research, 36(12), 3993-4008. doi:10.1093/nar/gkn349Buendía-Monreal, M., & Gillmor, C. S. (2016). Mediator: A key regulator of plant development. Developmental Biology, 419(1), 7-18. doi:10.1016/j.ydbio.2016.06.009Canales, C., Bhatt, A. M., Scott, R., & Dickinson, H. (2002). EXS, a Putative LRR Receptor Kinase, Regulates Male Germline Cell Number and Tapetal Identity and Promotes Seed Development in Arabidopsis. Current Biology, 12(20), 1718-1727. doi:10.1016/s0960-9822(02)01151-xCarbonell-Bejerano, P., Urbez, C., Carbonell, J., Granell, A., & Perez-Amador, M. A. (2010). A Fertilization-Independent Developmental Program Triggers Partial Fruit Development and Senescence Processes in Pistils of Arabidopsis. Plant Physiology, 154(1), 163-172. doi:10.1104/pp.110.160044Chadick, J. Z., & Asturias, F. J. (2005). Structure of eukaryotic Mediator complexes. Trends in Biochemical Sciences, 30(5), 264-271. doi:10.1016/j.tibs.2005.03.001Chuang, C.-F., & Meyerowitz, E. M. (2000). Specific and heritable genetic interference by double-stranded RNA in Arabidopsis thaliana. Proceedings of the National Academy of Sciences, 97(9), 4985-4990. doi:10.1073/pnas.060034297Clough, S. J., & Bent, A. F. (1998). Floral dip: a simplified method forAgrobacterium-mediated transformation ofArabidopsis thaliana. The Plant Journal, 16(6), 735-743. doi:10.1046/j.1365-313x.1998.00343.xColeman, A. W., & Goff, L. J. (1985). Applications of Fluorochromes to Pollen Biology. I. Mithramycin and 4′,6-Diamidino-2-Phenylindole (Dapi) as Vital Stains and for Quantitation of Nuclear Dna. Stain Technology, 60(3), 145-154. doi:10.3109/10520298509113905Conaway, R. C., Sato, S., Tomomori-Sato, C., Yao, T., & Conaway, J. W. (2005). The mammalian Mediator complex and its role in transcriptional regulation. Trends in Biochemical Sciences, 30(5), 250-255. doi:10.1016/j.tibs.2005.03.002Cottrell, H. J. (1948). Tetrazolium Salt as a Seed Germination Indicator. Annals of Applied Biology, 35(1), 123-131. doi:10.1111/j.1744-7348.1948.tb07355.xCrane, M. B. (1915). Heredity of types of inflorescence and fruits in tomato. Journal of Genetics, 5(1), 1-11. doi:10.1007/bf02982149Davoine, C., Abreu, I. N., Khajeh, K., Blomberg, J., Kidd, B. N., Kazan, K., … Björklund, S. (2017). Functional metabolomics as a tool to analyze Mediator function and structure in plants. PLOS ONE, 12(6), e0179640. doi:10.1371/journal.pone.0179640Ellul, P., Garcia-Sogo, B., Pineda, B., Ríos, G., Roig, L., & Moreno, V. (2003). The ploidy level of transgenic plants in Agrobacterium-mediated transformation of tomato cotyledons (Lycopersicon esculentum L.Mill.) is genotype and procedure dependent. Theoretical and Applied Genetics, 106(2), 231-238. doi:10.1007/s00122-002-0928-yFallath, T., Kidd, B. N., Stiller, J., Davoine, C., Björklund, S., Manners, J. M., … Schenk, P. M. (2017). MEDIATOR18 and MEDIATOR20 confer susceptibility to Fusarium oxysporum in Arabidopsis thaliana. PLOS ONE, 12(4), e0176022. doi:10.1371/journal.pone.0176022Feng, B., Lu, D., Ma, X., Peng, Y., Sun, Y., Ning, G., & Ma, H. (2012). Regulation of the Arabidopsis anther transcriptome by DYT1 for pollen development. The Plant Journal, 72(4), 612-624. doi:10.1111/j.1365-313x.2012.05104.xGillaspy, G., Ben-David, H., & Gruissem, W. (1993). Fruits: A Developmental Perspective. The Plant Cell, 1439-1451. doi:10.1105/tpc.5.10.1439Gleave, A. P. (1992). A versatile binary vector system with a T-DNA organisational structure conducive to efficient integration of cloned DNA into the plant genome. Plant Molecular Biology, 20(6), 1203-1207. doi:10.1007/bf00028910Gómez, J. F., Talle, B., & Wilson, Z. A. (2015). Anther and pollen development: A conserved developmental pathway. Journal of Integrative Plant Biology, 57(11), 876-891. doi:10.1111/jipb.12425Gorman, S. W., McCormick, S., & Rick, C. (1997). Male Sterility in Tomato. Critical Reviews in Plant Sciences, 16(1), 31-53. doi:10.1080/07352689709701945Helliwell, C. (2003). Constructs and methods for high-throughput gene silencing in plants. Methods, 30(4), 289-295. doi:10.1016/s1046-2023(03)00036-7Honys, D., & Twell, D. (2004). Transcriptome analysis of haploid male gametophyte development in Arabidopsis. Genome Biology, 5(11). doi:10.1186/gb-2004-5-11-r85Jeong, H.-J., Kang, J.-H., Zhao, M., Kwon, J.-K., Choi, H.-S., Bae, J. H., … Kang, B.-C. (2014). Tomato Male sterile 1035 is essential for pollen development and meiosis in anthers. Journal of Experimental Botany, 65(22), 6693-6709. doi:10.1093/jxb/eru389Jimenez-Lopez, J. C., Zienkiewicz, A., Zienkiewicz, K., Alché, J. D., & Rodríguez-García, M. I. (2015). Biogenesis of protein bodies during legumin accumulation in developing olive (Olea europaea L.) seed. Protoplasma, 253(2), 517-530. doi:10.1007/s00709-015-0830-5Kornberg, R. D. (2005). Mediator and the mechanism of transcriptional activation. Trends in Biochemical Sciences, 30(5), 235-239. doi:10.1016/j.tibs.2005.03.011Lai, Z., Schluttenhofer, C. M., Bhide, K., Shreve, J., Thimmapuram, J., Lee, S. Y., … Mengiste, T. (2014). MED18 interaction with distinct transcription factors regulates multiple plant functions. Nature Communications, 5(1). doi:10.1038/ncomms4064Larivière, L., Geiger, S., Hoeppner, S., Röther, S., Sträßer, K., & Cramer, P. (2006). Structure and TBP binding of the Mediator head subcomplex Med8–Med18–Med20. Nature Structural & Molecular Biology, 13(10), 895-901. doi:10.1038/nsmb1143Lee, S. K., Chen, X., Huang, L., & Stargell, L. A. (2013). The head module of Mediator directs activation of preloaded RNAPII in vivo. Nucleic Acids Research, 41(22), 10124-10134. doi:10.1093/nar/gkt796Li, D.-D., Xue, J.-S., Zhu, J., & Yang, Z.-N. (2017). Gene Regulatory Network for Tapetum Development in Arabidopsis thaliana. Frontiers in Plant Science, 8. doi:10.3389/fpls.2017.01559Liu, X., Huang, J., Parameswaran, S., Ito, T., Seubert, B., Auer, M., … Zhao, D. (2009). The SPOROCYTELESS/NOZZLE Gene Is Involved in Controlling Stamen Identity in Arabidopsis. Plant Physiology, 151(3), 1401-1411. doi:10.1104/pp.109.145896Lora, J., Hormaza, J. I., Herrero, M., & Gasser, C. S. (2011). Seedless fruits and the disruption of a conserved genetic pathway in angiosperm ovule development. Proceedings of the National Academy of Sciences, 108(13), 5461-5465. doi:10.1073/pnas.1014514108Lozano, R., Angosto, T., Gómez, P., Payán, C., Capel, J., Huijser, P., … Martı́nez-Zapater, J. M. (1998). Tomato Flower Abnormalities Induced by Low Temperatures Are Associated with Changes of Expression of MADS-Box Genes. Plant Physiology, 117(1), 91-100. doi:10.1104/pp.117.1.91Ma, H. (2005). MOLECULAR GENETIC ANALYSES OF MICROSPOROGENESIS AND MICROGAMETOGENESIS IN FLOWERING PLANTS. Annual Review of Plant Biology, 56(1), 393-434. doi:10.1146/annurev.arplant.55.031903.141717McNeil, K. J., & Smith, A. G. (2009). A glycine-rich protein that facilitates exine formation during tomato pollen development. Planta, 231(4), 793-808. doi:10.1007/s00425-009-1089-xMercier, R. (2003). The meiotic protein SWI1 is required for axial element formation and recombination initiation in Arabidopsis. Development, 130(>14), 3309-3318. doi:10.1242/dev.00550Mukundan, B., & Ansari, A. (2011). Novel Role for Mediator Complex Subunit Srb5/Med18 in Termination of Transcription. Journal of Biological Chemistry, 286(43), 37053-37057. doi:10.1074/jbc.c111.295915Muschietti, J., Dircks, L., Vancanneyt, G., & McCormick, S. (1994). LAT52 protein is essential for tomato pollen development: pollen expressing antisense LAT52 RNA hydrates and germinates abnormally and cannot achieve fertilization. The Plant Journal, 6(3), 321-338. doi:10.1046/j.1365-313x.1994.06030321.xOzga, J. A., & Reinecke, D. M. (2003). Hormonal Interactions in Fruit Development. Journal of Plant Growth Regulation, 22(1), 73-81. doi:10.1007/s00344-003-0024-9Pacini, E. (2010). Relationships between Tapetum, Loculus, and Pollen during Development. International Journal of Plant Sciences, 171(1), 1-11. doi:10.1086/647923Pérez-Martín, F., Yuste-Lisbona, F. J., Pineda, B., Angarita-Díaz, M. P., García-Sogo, B., Antón, T., … Lozano, R. (2017). A collection of enhancer trap insertional mutants for functional genomics in tomato. Plant Biotechnology Journal, 15(11), 1439-1452. doi:10.1111/pbi.12728Pina, C., Pinto, F., Feijó, J. A., & Becker, J. D. (2005). Gene Family Analysis of the Arabidopsis Pollen Transcriptome Reveals Biological Implications for Cell Growth, Division Control, and Gene Expression Regulation. Plant Physiology, 138(2), 744-756. doi:10.1104/pp.104.057935Polowick, P. L., & Sawhney, V. K. (1993). An ultrastructural study of pollen development in tomato (Lycopersicon esculentum). I. Tetrad to early binucleate microspore stage. Canadian Journal of Botany, 71(8), 1039-1047. doi:10.1139/b93-120Polowick, P. L., & Sawhney, V. K. (1993). An ultrastructural study of pollen development in tomato (Lycopersicon esculentum). II. Pollen maturation. Canadian Journal of Botany, 71(8), 1048-1055. doi:10.1139/b93-121Rutley, N., & Twell, D. (2015). A decade of pollen transcriptomics. Plant Reproduction, 28(2), 73-89. doi:10.1007/s00497-015-0261-7Samanta, S., & Thakur, J. K. (2015). Importance of Mediator complex in the regulation and integration of diverse signaling pathways in plants. Frontiers in Plant Science, 6. doi:10.3389/fpls.2015.00757Schiefthaler, U., Balasubramanian, S., Sieber, P., Chevalier, D., Wisman, E., & Schneitz, K. (1999). Molecular analysis of NOZZLE, a gene involved in pattern formation and early sporogenesis during sex organ development in Arabidopsis thaliana. Proceedings of the National Academy of Sciences, 96(20), 11664-11669. doi:10.1073/pnas.96.20.11664Scott, R. J. (2004). Stamen Structure and Function. THE PLANT CELL ONLINE, 16(suppl_1), S46-S60. doi:10.1105/tpc.017012Smirnova, A., Leide, J., & Riederer, M. (2012). Deficiency in a Very-Long-Chain Fatty Acid β-Ketoacyl-Coenzyme A Synthase of Tomato Impairs Microgametogenesis and Causes Floral Organ Fusion. Plant Physiology, 161(1), 196-209. doi:10.1104/pp.112.206656Sorensen, A.-M., Kröber, S., Unte, U. S., Huijser, P., Dekker, K., & Saedler, H. (2003). TheArabidopsis ABORTED MICROSPORES(AMS) gene encodes a MYC class transcription factor. The Plant Journal, 33(2), 413-423. doi:10.1046/j.1365-313x.2003.01644.xWang, Y., Hu, Z., Zhang, J., Yu, X., Guo, J.-E., Liang, H., … Chen, G. (2018). Silencing SlMED18, tomato Mediator subunit 18 gene, restricts internode elongation and leaf expansion. Scientific Reports, 8(1). doi:10.1038/s41598-018-21679-1Wesley, S. V., Helliwell, C. A., Smith, N. A., Wang, M., Rouse, D. T., Liu, Q., … Waterhouse, P. M. (2001). Construct design for efficient, effective and high-throughput gene silencing in plants. The Plant Journal, 27(6), 581-590. doi:10.1046/j.1365-313x.2001.01105.xWilson, Z. A., & Zhang, D.-B. (2009). From Arabidopsis to rice: pathways in pollen development. Journal of Experimental Botany, 60(5), 1479-1492. doi:10.1093/jxb/erp095Wilson, Z. A., Morroll, S. M., Dawson, J., Swarup, R., & Tighe, P. J. (2001). The Arabidopsis MALE STERILITY1 (MS1) gene is a transcriptional regulator of male gametogenesis, with homology to the PHD-finger family of transcription factors. The Plant Journal, 28(1), 27-39. doi:10.1046/j.1365-313x.2001.01125.xWiner, J., Jung, C. K. S., Shackel, I., & Williams, P. M. (1999). Development and Validation of Real-Time Quantitative Reverse Transcriptase–Polymerase Chain Reaction for Monitoring Gene Expression in Cardiac Myocytesin Vitro. Analytical Biochemistry, 270(1), 41-49. doi:10.1006/abio.1999.4085Yang, W.-C., Ye, D., Xu, J., & Sundaresan, V. (1999). The SPOROCYTELESS gene of Arabidopsis is required for initiation of sporogenesis and encodes a novel nuclear protein. Genes & Development, 13(16), 2108-2117. doi:10.1101/gad.13.16.2108Yang, C.-Y., Spielman, M., Coles, J. P., Li, Y., Ghelani, S., Bourdon, V., … Dickinson, H. G. (2003). TETRASPORE encodes a kinesin required for male meiotic cytokinesis in Arabidopsis. The Plant Journal, 34(2), 229-240. doi:10.1046/j.1365-313x.2003.01713.xYang, C., Vizcay-Barrena, G., Conner, K., & Wilson, Z. A. (2007). MALE STERILITY1 Is Required for Tapetal Development and Pollen Wall Biosynthesis. The Plant Cell, 19(11), 3530-3548. doi:10.1105/tpc.107.054981Yuan, W., Li, X., Chang, Y., Wen, R., Chen, G., Zhang, Q., & Wu, C. (2009). Mutation of the rice genePAIR3results in lack of bivalent formation in meiosis. The Plant Journal, 59(2), 303-315. doi:10.1111/j.1365-313x.2009.03870.xYuste-Lisbona, F. J., Quinet, M., Fernández-Lozano, A., Pineda, B., Moreno, V., Angosto, T., & Lozano, R. (2016). Characterization of vegetative inflorescence (mc-vin) mutant provides new insight into the role of MACROCALYX in regulating inflorescence development of tomato. Scientific Reports, 6(1). doi:10.1038/srep18796Zhao, D.-Z. (2002). The EXCESS MICROSPOROCYTES1 gene encodes a putative leucine-rich repeat receptor protein kinase that controls somatic and reproductive cell fates in the Arabidopsis anther. Genes & Development, 16(15), 2021-2031. doi:10.1101/gad.997902Zheng, Z., Guan, H., Leal, F., Grey, P. H., & Oppenheimer, D. G. (2013). Mediator Subunit18 Controls Flowering Time and Floral Organ Identity in Arabidopsis. PLoS ONE, 8(1), e53924. doi:10.1371/journal.pone.0053924Zhou, S., Wang, Y., Li, W., Zhao, Z., Ren, Y., Wang, Y., … Wan, J. (2011). Pollen Semi-Sterility1 Encodes a Kinesin-1–Like Protein Important for Male Meiosis, Anther Dehiscence, and Fertility in Rice. The Plant Cell, 23(1), 111-129. doi:10.1105/tpc.109.07369

Nurses' perceptions of aids and obstacles to the provision of optimal end of life care in ICU

Contains fulltext : 172380.pdf (publisher's version ) (Open Access

A structural study of the behavior of bumper cars compared to a system of spatially uncorrelated hard disks

2014/201

Influencia de taninos sobre características físicas y sensoriales de carne de bovinos en engorda

Para evaluar la adición de 0.3 % extracto de taninos en las características físicas y sensoriales de la carne de bovinos engordados de forma intensiva, se utilizaron muestras del músculo Longissimus dorsi de 16 toretes ( Bos taurus x Bos indicus ), los cuales durante los últimos 70 días de la engorda recibieron dieta de finalización (13.3% PC y 2.0 Mcal ENm/kg de MS), y en grupos de ocho se asignaron al azar para recibir uno de dos tratamientos: 1) die ta de finalización (testigo); 2) testigo más 0.3% (base seca) de extracto de taninos (ET). El extracto de taninos fue de Bypro® (SilvaFeed, Indunor, S.A., Argentina) que contiene 70 % de taninos. Los toretes se sacrificaron en l a planta TIF No. 99. A las 24 h posteriores al sacrificio se tomaron cuatro muestras (2.5 cm de grosor) a la altu ra de la 12 a y 13 a costilla de la media canal izquierda. Se evaluaron las características físicas y el perfil sensorial , así como la percepción y aceptaci ón de la carne por consumidores. Los taninos no influyeron en las características físicas de la carne ( P >0.05). El perfil sensorial no fue influenciado por tratamientos ( P >0.05). La percepción y preferencia del producto respecto a jugosidad y terneza fue similar para ambos tratamientos. Los consumidores mostraron preferencia por el nivel Gusta moderadamente , para testigo y tratamiento. Se concluye que la adición de 0.3 % de extracto de taninos en la dieta de bovinos en engorda intensiva, no afecta las características físic as y sensoriales de la carne

Influencia de la adiciòn de extracto de taninos sobre las caracterìsticas fìsicas y atributos sensoriales de la carne de bovinos engordados de forma intensiva

Para evaluar la adición de 0.3 % extracto de taninos en las características físicas y sensoriales de la carne de bovinosengordados de forma intensiva, se utilizaron muestras del músculo Longissimus dorside 16 toretes (Bos taurus xBosindicus), los cuales durante los últimos 70 días de la engorda recibieron dieta de finalización (13.3% PC y 2.0 McalENm/kg de MS), y en grupos de ocho se asignaron al azar para recibir uno de dos tratamientos: 1) dieta de finalización(testigo); 2) testigo más 0.3% (base seca) de extracto de taninos (ET). El extracto de taninos fue de Bypro®(SilvaFeed, Indunor, S.A., Argentina) que contiene 70 % de taninos. Los toretes se sacrificaron en la planta TIFNo. 99. A las 24 h posteriores al sacrificio se tomaron cuatro muestras (2.5 cm de grosor) a la altura de la 12ay 13acostilla de la media canal izquierda. Se evaluaron las características físicas y el perfil sensorial, así comola percepción y aceptación de la carne por consumidores. Los taninos no influyeron en las características físicasde la carne (P>0.05). El perfil sensorial no fue influenciado por tratamientos (P>0.05). La percepción y preferenciadel producto respecto a jugosidad y terneza fue similar para ambos tratamientos. Los consumidores mostraronpreferencia por el nivel “Gusta moderadamente”, para testigo y tratamiento. Se concluye que la adición de 0.3 % deextracto de taninos en la dieta de bovinos en engorda intensiva, no afecta las características físicas y sensoriales dela carneCONACYT UAEMex UAM- Iztapalapa UA