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Journal articles on the topic 'POTRA'

Author: Grafiati

Published: 4 June 2021

Last updated: 18 February 2022

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1

Bertran, Ramon, Marc Gonzàlez, Xavier Martorell, Nacho Navarro, and Eduard Ayguadé. "POTRA." ACM SIGMETRICS Performance Evaluation Review 40, no. 1 (2012): 427–28. http://dx.doi.org/10.1145/2318857.2254827.

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2

Grass, Susan, Katherine A. Rempe, and Joseph W. St. Geme. "Structural Determinants of the Interaction between the TpsA and TpsB Proteins in the Haemophilus influenzae HMW1 Two-Partner Secretion System." Journal of Bacteriology 197, no. 10 (2015): 1769–80. http://dx.doi.org/10.1128/jb.00039-15.

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ABSTRACTThe two-partner secretion (TPS) pathway in Gram-negative bacteria consists of a TpsA exoprotein and a cognate TpsB outer membrane pore-forming translocator protein. Previous work has demonstrated that the TpsA protein contains an N-terminal TPS domain that plays an important role in targeting the TpsB protein and is required for secretion. The nontypeableHaemophilus influenzaeHMW1 and HMW2 adhesins are homologous proteins that are prototype TpsA proteins and are secreted by the HMW1B and HMW2B TpsB proteins. In the present study, we sought to define the structural determinants of HMW1 interaction with HMW1B during the transport process and while anchored to the bacterial surface. Modeling of HMW1B revealed an N-terminal periplasmic region that contains two polypeptide transport-associated (POTRA) domains and a C-terminal membrane-localized region that forms a pore. Biochemical studies demonstrated that HMW1 engages HMW1B via interaction between the HMW1 TPS domain and the HMW1B periplasmic region, specifically, the predicted POTRA1 and POTRA2 domains. Subsequently, HMW1 is shuttled to the HMW1B pore, facilitated by the N-terminal region, the middle region, and the NPNG motif in the HMW1 TPS domain. Additional analysis revealed that the interaction between HMW1 and HMW1B is highly specific and is dependent upon the POTRA domains and the pore-forming domain of HMW1B. Further studies established that tethering of HMW1 to the surface-exposed region of HMW1B is dependent upon the external loops of HMW1B formed by residues 267 to 283 and residues 324 to 330. These observations may have broad relevance to proteins secreted by the TPS pathway.IMPORTANCESecretion of HMW1 involves a recognition event between the extended form of the HMW1 propiece and the HMW1B POTRA domains. Our results identify specific interactions between the HMW1 propiece and the periplasmic HMW1B POTRA domains. The results also suggest that the process of HMW1 translocation involves at least two discrete steps, including initial interaction between the HMW1 propiece and the HMW1B POTRA domains and then a separate translocation event. We have also discovered that the HMW1B pore itself appears to influence the translocation process. These observations extend our knowledge of the two-partner secretion system and may be broadly relevant to other proteins secreted by the TPS pathway.

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3

O’Neil, Patrick K., Lynn G. L. Richardson, Yamuna D. Paila, et al. "The POTRA domains of Toc75 exhibit chaperone-like function to facilitate import into chloroplasts." Proceedings of the National Academy of Sciences 114, no. 24 (2017): E4868—E4876. http://dx.doi.org/10.1073/pnas.1621179114.

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Protein trafficking across membranes is an essential function in cells; however, the exact mechanism for how this occurs is not well understood. In the endosymbionts, mitochondria and chloroplasts, the vast majority of proteins are synthesized in the cytoplasm as preproteins and then imported into the organelles via specialized machineries. In chloroplasts, protein import is accomplished by the TOC (translocon on the outer chloroplast membrane) and TIC (translocon on the inner chloroplast membrane) machineries in the outer and inner envelope membranes, respectively. TOC mediates initial recognition of preproteins at the outer membrane and includes a core membrane channel, Toc75, and two receptor proteins, Toc33/34 and Toc159, each containing GTPase domains that control preprotein binding and translocation. Toc75 is predicted to have a β-barrel fold consisting of an N-terminal intermembrane space (IMS) domain and a C-terminal 16-stranded β-barrel domain. Here we report the crystal structure of the N-terminal IMS domain of Toc75 from Arabidopsis thaliana, revealing three tandem polypeptide transport-associated (POTRA) domains, with POTRA2 containing an additional elongated helix not observed previously in other POTRA domains. Functional studies show an interaction with the preprotein, preSSU, which is mediated through POTRA2-3. POTRA2-3 also was found to have chaperone-like activity in an insulin aggregation assay, which we propose facilitates preprotein import. Our data suggest a model in which the POTRA domains serve as a binding site for the preprotein as it emerges from the Toc75 channel and provide a chaperone-like activity to prevent misfolding or aggregation as the preprotein traverses the intermembrane space.

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4

Molloy, Sheilagh. "POTRA domains close up." Nature Reviews Microbiology 5, no. 10 (2007): 747. http://dx.doi.org/10.1038/nrmicro1756.

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5

Stroud, David A., Thomas Becker, Jian Qiu та ін. "Biogenesis of mitochondrial β-barrel proteins: the POTRA domain is involved in precursor release from the SAM complex". Molecular Biology of the Cell 22, № 16 (2011): 2823–33. http://dx.doi.org/10.1091/mbc.e11-02-0148.

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The mitochondrial outer membrane contains proteinaceous machineries for the translocation of precursor proteins. The sorting and assembly machinery (SAM) is required for the insertion of β‑barrel proteins into the outer membrane. Sam50 is the channel-forming core subunit of the SAM complex and belongs to the BamA/Sam50/Toc75 family of proteins that have been conserved from Gram-negative bacteria to mitochondria and chloroplasts. These proteins contain one or more N-terminal polypeptide transport-associated (POTRA) domains. POTRA domains can bind precursor proteins, however, different views exist on the role of POTRA domains in the biogenesis of β-barrel proteins. It has been suggested that the single POTRA domain of mitochondrial Sam50 plays a receptor-like function at the SAM complex. We established a system to monitor the interaction of chemical amounts of β-barrel precursor proteins with the SAM complex of wild-type and mutant yeast in organello. We report that the SAM complex lacking the POTRA domain of Sam50 efficiently binds β-barrel precursors, but is impaired in the release of the precursors. These results indicate the POTRA domain of Sam50 is not essential for recognition of β-barrel precursors but functions in a subsequent step to promote the release of precursor proteins from the SAM complex.

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6

Dong, Shishang, Hongguan Chu, Kangning Wen та ін. "Crystallization and X-ray analysis of Borrelia burgdorferi β-barrel assembly machinery A". Acta Crystallographica Section F Structural Biology Communications 76, № 6 (2020): 235–40. http://dx.doi.org/10.1107/s2053230x20006196.

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Mitochondria, chloroplasts and several species of bacteria have outer membrane proteins (OMPs) that perform many essential biological functions. The β-barrel assembly machinery (BAM) complex is one of the OMPs of Borrelia burgdorferi, the pathogenic spirochete that causes Lyme disease, and its BamA component (BbBamA) includes a C-terminal β-barrel domain and five N-terminal periplasmic polypeptide-transport-associated (POTRA) domains, which together perform a central transport function. In the current work, the production, crystallization and X-ray analysis of the three N-terminal POTRA domains of BbBamA (BbBamA-POTRA P1–P3; residues 30–273) were carried out. The crystals of BbBamA-POTRA P1–P3 belonged to space group P21, with unit-cell parameters a = 45.353, b = 111.538, c = 64.376 Å, β = 99.913°. The Matthews coefficient was calculated to be 2.92 Å3 Da−1, assuming the presence of two molecules per asymmetric unit, and the corresponding solvent content was 57.9%. Owing to the absence of an ideal homology model, numerous attempts to solve the BbBamA-POTRA P1–P3 structure using molecular replacement (MR) failed. In order to solve the structure, further trials using selenomethionine derivatization are currently being carried out.

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7

Lotfi, Taher, Stanford Shateyi, and Sommayeh Hadadi. "Potra-Pták Iterative Method with Memory." ISRN Mathematical Analysis 2014 (January 22, 2014): 1–6. http://dx.doi.org/10.1155/2014/697642.

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The problem is to extend the method proposed by Soleymani et al. (2012) to a method with memory. Following this aim, a free parameter is calculated using Newton’s interpolatory polynomial of the third degree. So the R-order of convergence is increased from 4 to 6 without any new function evaluations. Numerically the extended method is examined along with comparison to some existing methods with the similar properties.

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8

Rossi, R., J. M. Silva Filho, M. S. Palhares, M. M. Silva, R. A. Martins, and C. L. A. Silva. "Efeito da categoria reprodutiva sobre a fertilidade de éguas inseminadas com sêmen asinino diluído e resfriado a 5ºC por 12 horas de armazenamento." Arquivo Brasileiro de Medicina Veterinária e Zootecnia 66, no. 6 (2014): 1655–61. http://dx.doi.org/10.1590/1678-7248.

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Estudou-se o efeito da categoria reprodutiva sobre a fertilidade de éguas inseminadas com sêmen asinino diluído, resfriado e armazenado. Os ciclos foram acompanhados por palpação retal e rufiação, sendo as inseminações realizadas às terças, quintas e sábados, a partir da detecção de um folículo de 3,0 a 3,5cm de diâmetro, em um dos ovários, até a ovulação. O sêmen de cinco jumentos da raça Pêga foi diluído nos diluidores de leite em pó desnatado-glicose ou glicina-gema de ovo, resfriado a 5ºC e armazenado por 12 horas, sendo a dose inseminante de 400 x 106espermatozoides móveis (no momento da diluição final, pré-resfriamento) depositada no corpo do útero. O diagnóstico de gestação foi realizado por meio de palpação transretal, rufiação e ultrassonografia, realizada a cada 14 dias. Os resultados de 195 ciclos, referentes a 141 éguas, foram agrupados de acordo com a categoria reprodutiva a que pertenciam: potra, égua solteira, égua parida e no "cio do potro". As taxas de concepção, ao primeiro ciclo, foram de 60,00%, 48,28%, 75,00% e 47,17% e, após quatro ciclos, de 61,54%, 47,13%, 54,76% e 47,17%, na mesma ordem para as categorias descritas anteriormente. A categoria reprodutiva não teve efeito (P>0,05) sobre a fertilidade das éguas inseminadas com sêmen asinino resfriado, sendo as potras, éguas solteiras, éguas paridas e no "cio do potro" igualmente eficientes para o uso na reprodução.

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9

Souza, Luiz Antonio Farani de, Emerson Vitor Castelani, and Wesley Vagner Inês Shirabayashi. "Adaptation of the Newton-Raphson and Potra-Pták methods for the solution of nonlinear systems." Semina: Ciências Exatas e Tecnológicas 42, no. 1 (2021): 63. http://dx.doi.org/10.5433/1679-0375.2021v42n1p63.

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In this paper we adapt the Newton-Raphson and Potra-Pták algorithms by combining them with the modified Newton-Raphson method by inserting a condition. Problems of systems of sparse nonlinear equations are solved the algorithms implemented in Matlab® environment. In addition, the methods are adapted and applied to space trusses problems with geometric nonlinear behavior. Structures are discretized by the Finite Element Positional Method, and nonlinear responses are obtained in an incremental and iterative process using the Linear Arc-Length path-following technique. For the studied problems, the proposed algorithms had good computational performance reaching the solution with shorter processing time and fewer iterations until convergence to a given tolerance, when compared to the standard algorithms of the Newton-Raphson and Potra-Pták methods.

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10

Pereira, Andrielli Trentim, Ana Paula Maurique Pereira, Inácio Manassi da Conceição Brandolt, et al. "Linfoma multicêntrico de Células T em uma potra Crioula." Semina: Ciências Agrárias 41, no. 2 (2020): 725–30. http://dx.doi.org/10.5433/1679-0359.2020v41n2p725.

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11

Li, Chaoxing, Li Liu, and Valentin Dinu. "Pathways of topological rank analysis (PoTRA): a novel method to detect pathways involved in hepatocellular carcinoma." PeerJ 6 (April 9, 2018): e4571. http://dx.doi.org/10.7717/peerj.4571.

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Complex diseases such as cancer are usually the result of a combination of environmental factors and one or several biological pathways consisting of sets of genes. Each biological pathway exerts its function by delivering signaling through the gene network. Theoretically, a pathway is supposed to have a robust topological structure under normal physiological conditions. However, the pathway’s topological structure could be altered under some pathological condition. It is well known that a normal biological network includes a small number of well-connected hub nodes and a large number of nodes that are non-hubs. In addition, it is reported that the loss of connectivity is a common topological trait of cancer networks, which is an assumption of our method. Hence, from normal to cancer, the process of the network losing connectivity might be the process of disrupting the structure of the network, namely, the number of hub genes might be altered in cancer compared to that in normal or the distribution of topological ranks of genes might be altered. Based on this, we propose a new PageRank-based method called Pathways of Topological Rank Analysis (PoTRA) to detect pathways involved in cancer. We use PageRank to measure the relative topological ranks of genes in each biological pathway, then select hub genes for each pathway, and use Fisher’s exact test to test if the number of hub genes in each pathway is altered from normal to cancer. Alternatively, if the distribution of topological ranks of gene in a pathway is altered between normal and cancer, this pathway might also be involved in cancer. Hence, we use the Kolmogorov–Smirnov test to detect pathways that have an altered distribution of topological ranks of genes between two phenotypes. We apply PoTRA to study hepatocellular carcinoma (HCC) and several subtypes of HCC. Very interestingly, we discover that all significant pathways in HCC are cancer-associated generally, while several significant pathways in subtypes of HCC are HCC subtype-associated specifically. In conclusion, PoTRA is a new approach to explore and discover pathways involved in cancer. PoTRA can be used as a complement to other existing methods to broaden our understanding of the biological mechanisms behind cancer at the system-level.

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12

Soleymani, F., Rajni Sharma, Xiaowu Li, and E. Tohidi. "An optimized derivative-free form of the Potra–Pták method." Mathematical and Computer Modelling 56, no. 5-6 (2012): 97–104. http://dx.doi.org/10.1016/j.mcm.2011.12.005.

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13

Misra, Rajeev. "First Glimpse of the Crystal Structure of YaeT’s POTRA Domains." ACS Chemical Biology 2, no. 10 (2007): 649–51. http://dx.doi.org/10.1021/cb700212p.

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14

Delattre, Anne‐Sophie, Nathalie Saint, Bernard Clantin, et al. "Substrate recognition by the POTRA domains of TpsB transporter FhaC." Molecular Microbiology 81, no. 1 (2011): 99–112. http://dx.doi.org/10.1111/j.1365-2958.2011.07680.x.

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15

Fleming, Patrick J., Dhilon S. Patel, Emilia L. Wu, et al. "BamA POTRA Domain Interacts with a Native Lipid Membrane Surface." Biophysical Journal 110, no. 12 (2016): 2698–709. http://dx.doi.org/10.1016/j.bpj.2016.05.010.

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16

Argyros, Ioannis K. "On Newton's method and nondiscrete mathematical induction." Bulletin of the Australian Mathematical Society 38, no. 1 (1988): 131–40. http://dx.doi.org/10.1017/s0004972700027349.

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The method of nondiscrete mathematical induction is used to find sharp error bounds for Newton's method. We assume only that the operator has Hölder continuous derivatives. In the case when the Fréchet-derivative of the operator satisfies a Lipschitz condition, our results reduce to the ones obtained by Ptak and Potra in 1972.

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17

Souza, Luiz Antonio Farani de, Leandro Vanalli, and Arthur Bueno de Luz. "Numerical-Computational Model for Nonlinear Analysis of Frames with Semirigid Connection." Mathematical Problems in Engineering 2020 (September 3, 2020): 1–11. http://dx.doi.org/10.1155/2020/3613892.

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A numerical-computational model for static analysis of plane frames with semirigid connections and geometric nonlinear behavior is presented. The set of nonlinear equations governing the structural system is solved by the Potra–Pták method in an incremental procedure, with order of cubic convergence, combined with the linear arc-length path-following technique. The algorithm pseudo-code is presented, and the finite element corotational method is used for the discretization of the structures. The equilibrium paths with load and displacement limit points are obtained. The semirigidity is simulated by a linear connection element of null length, which considers the axial, tangential, and rotational stiffness. Nonlinear analyses of 2D frame structures are carried out with the free Scilab program. The results show that the Potra–Pták procedure can decrease the number of iterations and the computing time in comparison with the standard and modified Newton–Raphson iterative schemes. Also, the simulations show that the connection flexibility has a strong influence on the nonlinear behavior and stability of the structural systems.

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18

Kansal, Munish, Vinay Kanwar, and Saurabh Bhatia. "An Optimal Eighth-Order Derivative-Free Family of Potra-Pták’s Method." Algorithms 8, no. 2 (2015): 309–20. http://dx.doi.org/10.3390/a8020309.

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19

Dong, Cheng, Xue Yang, Hai-Feng Hou, Yue-Quan Shen, and Yu-Hui Dong. "Structure ofEscherichia coliBamB and its interaction with POTRA domains of BamA." Acta Crystallographica Section D Biological Crystallography 68, no. 9 (2012): 1134–39. http://dx.doi.org/10.1107/s0907444912023141.

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20

Woźniakowski, H. "Nondiscrete Induction and Iterative Processes (F.-A. Potra and V. Ptak)." SIAM Review 29, no. 3 (1987): 505–6. http://dx.doi.org/10.1137/1029105.

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21

Dastvan, Reza, Eva-Maria Brouwer, Sevdalina Lyubenova, et al. "Investigation of the Potra Domains from Cyanobacterial Omp85 by Peldor Spectroscopy." Biophysical Journal 102, no. 3 (2012): 405a. http://dx.doi.org/10.1016/j.bpj.2011.11.2211.

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22

Liu, Jinchan, and James C. Gumbart. "Dynamic Lateral Gate of BamA and TamA Regulated by POTRA Domains." Biophysical Journal 118, no. 3 (2020): 365a—366a. http://dx.doi.org/10.1016/j.bpj.2019.11.2098.

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23

Argyros, Ioannis K., Stepan Shakhno, Yuriy Shunkin, and Halyna Yarmola. "Extended convergence analysis of the Newton–Potra method under weak conditions." Applicationes Mathematicae 48, no. 1 (2021): 101–10. http://dx.doi.org/10.4064/am2406-7-2020.

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24

ARGYROS, IOANNIS K. "ON AN APPLICATION OF A VARIANT OF THE CLOSED GRAPH THEOREM AND THE SECANT METHOD." Tamkang Journal of Mathematics 24, no. 3 (1993): 251–67. http://dx.doi.org/10.5556/j.tkjm.24.1993.4496.

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   The method of nondiscrete mathematical induction is used to find error bounds for the Secant method. We assume only that the operator has Holder continuous derivatives. In the case the Frechet derivative of the operator satisfies a Lipschitz condition our results reduce to the ones obtained by F. Potra (Num. Math. 1982).   

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25

Lu, Lianming, Baoping Cheng, Jinai Yao, et al. "A New Diagnostic System for Detection of ‘Candidatus Liberibacter asiaticus’ Infection in Citrus." Plant Disease 97, no. 10 (2013): 1295–300. http://dx.doi.org/10.1094/pdis-11-12-1086-re.

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In this study, two polyclonal antibodies were produced against the Omp protein of ‘Candidatus Liberibacter asiaticus’. First, omp genes were sequenced to exhibit 99.9% identity among 137 isolates collected from different geographical origins. Then, two peptides containing the hydrophobic polypeptide-transport-associated (POTRA) domain and β-barrel domain, respectively, were identified on Omp protein. After that, these two peptides were overexpressed in Escherichia coli and purified by affinity chromatography to immunize the white rabbits. Finally, the antiserum was purified by affinity chromatography. The two Omp antibodies gave positive results (0.454 to 0.633, 1:1,600 dilution) in enzyme-linked immunosorbent assay against ‘Ca. L. asiaticus’-infected samples collected from different geographical origins but revealed negative results against other pathogen-infected, nutrient-deficient and healthy samples. The antibody against the POTRA domain of Omp protein could detect ‘Ca. L. asiaticus’ in 45.7% of the symptomatic samples compared with a 56.2% detection rate with a polymerase chain reaction assay. These new antibodies will provide a very useful supplement to the current approaches to ‘Ca. L. asiaticus’ detection and also provide powerful research tools for tracking distribution of this pathogen in vivo.

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26

Valadão, Carlos Augusto Araújo, Júlio Carlos Canola, and Roberta Ferro de Godoy. "Timpanismo bilateral de bolsa gutural em potro." Ciência Rural 34, no. 4 (2004): 1259–61. http://dx.doi.org/10.1590/s0103-84782004000400049.

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Uma potra da raça Quarto de Milha com dois meses de idade apresentava aumento de volume bilateral na região da parótida desde algumas horas após o nascimento. Por exame radiográfico diagnosticou-se timpanismo bilateral de bolsa gutural. Realizou-se a abertura cirúrgica da bolsa gutural esquerda e fenestrou-se o septo medial das bolsas guturais. Adicionalmente, procedeu-se à ressecção parcial da mucosa na abertura do orifício guturo-faríngeo. A afecção foi debelada, sem recidivas.

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27

Dong, Cheng, Xue Yang, Hai-Feng Hou, Yue-Quan Shen, and Yu-Hui Dong. "Structure ofEscherichia coliBamB and its interaction with POTRA domains of BamA. Addendum." Acta Crystallographica Section D Biological Crystallography 68, no. 10 (2012): 1437. http://dx.doi.org/10.1107/s0907444912037869.

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28

Koenig, Patrick, Oliver Mirus, Raimund Haarmann, et al. "Conserved Properties of Polypeptide Transport-associated (POTRA) Domains Derived from Cyanobacterial Omp85." Journal of Biological Chemistry 285, no. 23 (2010): 18016–24. http://dx.doi.org/10.1074/jbc.m110.112649.

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29

Jnawali, Jivandhar. "New Modified Newton Type Iterative Methods." Nepal Journal of Mathematical Sciences 2, no. 1 (2021): 17–24. http://dx.doi.org/10.3126/njmathsci.v2i1.36559.

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In this work, we present two Newton type iterative methods for finding the solution of nonlinear equations of single variable. One is obtained as variant of McDougall and Wotherspoon method, and another is obtained by amalgamation of Potra and Pta’k method and our newly introduced method. The order of convergence of these methods are 1 + √2 and 3.5615. Some numerical examples are given to compare the performance of these methods with some similar existing methods.

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30

Bos, Martine P., Viviane Robert, and Jan Tommassen. "Functioning of outer membrane protein assembly factor Omp85 requires a single POTRA domain." EMBO reports 8, no. 12 (2007): 1149–54. http://dx.doi.org/10.1038/sj.embor.7401092.

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31

Franco da Cruz Cechim et al., Alessandra. "Ossificação incompleta dos ossos cárpicos e társicos em potra prematura – relato de caso." Revista Acadêmica: Ciência Animal 15 (July 21, 2017): 321. http://dx.doi.org/10.7213/academica.15.s01.2017.160.

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32

Magreñán, Á. Alberto, and Ioannis K. Argyros. "Optimizing the applicability of a theorem by F. Potra for Newton-like methods." Applied Mathematics and Computation 242 (September 2014): 612–23. http://dx.doi.org/10.1016/j.amc.2014.05.078.

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33

Dastvan, Reza, Eva-Maria Brouwer, Denise Schuetz, Oliver Mirus, Enrico Schleiff, and Thomas F. Prisner. "Relative Orientation of POTRA Domains from Cyanobacterial Omp85 Studied by Pulsed EPR Spectroscopy." Biophysical Journal 110, no. 10 (2016): 2195–206. http://dx.doi.org/10.1016/j.bpj.2016.04.030.

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34

Герасимов, Сергей, and Sergey Gerasimov. "COMPARATIVE ANALYSIS OF BARLEY SPECIES OF THE WORLD COLLECTION OF THE RESEARCH INSTITUTE OF PLANT INDUSTRY IN THE CONDITIONS OF EASTERN SIBERIA." Bulletin of Kemerovo State University. Series: Biological, Engineering and Earth Sciences 2017, no. 2 (2017): 15–18. http://dx.doi.org/10.21603/2542-2448-2017-2-15-18.

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The current paper presents the results of a comparative evaluation of 74 samples of the world collection preserved at the Vavilov Research Institute of Plant Industry named in 2013-2016. The analyses features individual elements of productivity, yield and the variation degree (Cv, %). The samples of the six-rowed barley of Leningradskiy and Potra cultivars have been found early-ripening (vegetation period 68-69 days). The highest capacity for productive tillering (1.93-2.40 productive stems) have been registered in the cultivars of Rupal, Corona, Malva, Chelyabinets 2, Nutans 302, Belgorodets and Talovsky 9. The best graininess of the ear belongs to the following cultivars: 18/7, Tduneja, Spratt, Sv. 66905, Milns Golden Promise, Vladimir. According to the mass of 1000 grains (40.0-52.3 g), T-12 (Nutans 129), Yastreb, Belgorodets, Talovsky 9, Yak-401, Nudum 95, Codac, Vakula, Potra, Kolchan. The best grain mass from one plant (1.40-1.79 g) was registered in 18/7, Tduneja, T-12 (Nutans 129), Elf, Belgorodets, Talovsky 9, Heimdal, Nudum 95, Codac, Vakula and Kolchan. According to the productivity and resistance to lodging, the following samples proved to be stable during the research period: M 1913/88 (Czechoslovakia), Asem (Kazakhstan), Etienne (Canada). Their yield reached 555.0-575.0 g/m2, which is 8.2-12.1 % higher than that of the standard Acha cultivar. The barley samples studied in the research are of practical interest for solving regional breeding problems in Eastern Siberia.

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35

Manzano, Airton, Alfredo Ribeiro de Freitas, Sérgio Novita Esteves, and Nelson José Novaes. "Polpa de citros peletizada na alimentação de eqüinos." Revista Brasileira de Zootecnia 28, no. 6 (1999): 1327–32. http://dx.doi.org/10.1590/s1516-35981999000600021.

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O objetivo desta pesquisa foi estudar três níveis de polpa de citros peletizada (PCP) em substituição ao milho em dietas de potras em crescimento. Vinte e uma potras da raça Árabe e Cruza-Árabe, com peso inicial de 278+9,6 kg e 18 meses de idade, foram usadas. Os animais foram mantidos em baias individuais e diariamente exercitados. Foi usado delineamento inteiramente casualizado com três tratamentos, dieta basal (T1), 7,5% PCP (T2) e 15% PCP (T3), e sete repetições, em que a potra foi a unidade experimental. O período experimental foi de 16 semanas. As dietas foram formuladas com 40% de volumoso (feno de Cynodon dactylon Pers cv coast-cross) e 60% de concentrado, 14,5% de proteína bruta (PB) e 2,77 kcal/g de energia digestível na matéria seca (MS). Ganho em peso, o consumo voluntário (gMS/kg0,75) e perímetro torácico dos animais não diferiram entre os tratamentos. A altura média na cernelha para animais T1 (6,8+1,0 cm) foi superior à de T2 (3,4+1,0 cm) e T3 (4,6+1,0 cm). O coeficiente de digestibilidade aparente da MS para T2 (68,7+1,2%) e T3 (67,52+1,2%) foram superiores ao de T1 (58,62+1,2%). O mesmo fato ocorreu para a PB, sendo T2 (77,1+1,5%) e T3 (78,6+1,5%) maiores que T1 (70,8+1,5%). Para o teor de energia bruta, T2 (59,8+ 0,4%) foi inferior a T1 (62,0+0,4%) e T3 (61,2+0,4%). Não houve diferença entre os tratamentos para fibra em detergente neutro, fibra em detergente ácido e taxas de passagem das fases sólida e líquida das digestas das diferentes dietas. A polpa de citrus peletizada pode ser usada até o nível de 15% em rações de potras em crescimento, sem influir no desempenho do animal.

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Puoli Filho, José Nicolau Prospero, Ciniro Costa, Mário de Beni Arrigoni, and Antonio Carlos Silveira. "Suplementação mineral e mobilização de cálcio nos ossos de eqüinos em pastagem de Brachiaria humidicola." Pesquisa Agropecuária Brasileira 34, no. 5 (1999): 873–78. http://dx.doi.org/10.1590/s0100-204x1999000500020.

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Durante 150 dias, 12 potras Quarto-de-Milha de 1 ano de idade permaneceram exclusivamente em pastagem de Brachiaria humidicola, num experimento inteiramente casualizado, com três tratamentos, nível 0 (recomendação do NRC, 1989); nível 50 (50% a mais do NRC); nível 100 (100% a mais do NRC), e quatro repetições. Como palatabilizante foram empregadas 270 g de açúcar. Realizaram-se biópsias na asa do osso do ílio de cada potra, no início e final do experimento, para avaliar a mobilização de Ca e a relação Ca:P. As amostras da gramínea, foram coletadas mensalmente para verificação do teor de oxalato e composição químico-bromatológica. Houve efeito de tempo na mobilização de Ca, P e da relação Ca:P (p<0,05), independentemente dos tratamentos. As médias dos três tratamentos, no início e final do período experimental foram, quanto aos teores de Ca, P e da relação Ca:P, respectivamente: 10,05, 5,22, 1,93:1 e 6,24, 4,06, 1,54:1. O teor do oxalato na gramínea variou de 1,18 a 2,00%. A utilização do nível de cálcio suplementar duas vezes superior ao recomendado pelo National Research Council não foi suficiente para impedir a mobilização deste mineral nos ossos de eqüinos pastejando Brachiaria humidicola por longos períodos.

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Ferreira Mendonça et al., Lucas. "Pitiose mamária secundária à lesão cutânea em potra Quarto de Milha: relato de caso." Revista Acadêmica: Ciência Animal 15 (July 21, 2017): 341. http://dx.doi.org/10.7213/academica.15.s01.2017.170.

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Cordero, Alicia, José L. Hueso, Eulalia Martínez, and Juan R. Torregrosa. "New modifications of Potra–Pták’s method with optimal fourth and eighth orders of convergence." Journal of Computational and Applied Mathematics 234, no. 10 (2010): 2969–76. http://dx.doi.org/10.1016/j.cam.2010.04.009.

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Sinnige, Tessa, Markus Weingarth, Mark Daniëls, et al. "Conformational Plasticity of the POTRA 5 Domain in the Outer Membrane Protein Assembly Factor BamA." Structure 23, no. 7 (2015): 1317–24. http://dx.doi.org/10.1016/j.str.2015.04.014.

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Guérin, Jeremy, Nathalie Saint, Catherine Baud, et al. "Dynamic interplay of membrane-proximal POTRA domain and conserved loop L6 in Omp85 transporter FhaC." Molecular Microbiology 98, no. 3 (2015): 490–501. http://dx.doi.org/10.1111/mmi.13137.

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Franco, Maysa Ribeiro, Tatiana Figueiredo, José Mateus dos Reis Pinho Araújo, Dandara do Vale Sobral, Andrezza Caroline Aragão da Silva, and Deivisson Ferreira Aguiar. "AGENESIA DE CAUDA ASSOCIADA A ATRESIA ANAL E FÍSTULA RETOVAGINAL EM POTRA QUARTO DE MILHA." REVISTA BRASILEIRA DE MEDICINA VETERINÁRIA EQUINA 1, no. 93 (2021): 4–7. http://dx.doi.org/10.29327/236004.1.93-1.

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42

Chand, Prem B., Francisco I. Chicharro, Neus Garrido, and Pankaj Jain. "Design and Complex Dynamics of Potra–Pták-Type Optimal Methods for Solving Nonlinear Equations and Its Applications." Mathematics 7, no. 10 (2019): 942. http://dx.doi.org/10.3390/math7100942.

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In this paper, using the idea of weight functions on the Potra–Pták method, an optimal fourth order method, a non optimal sixth order method, and a family of optimal eighth order methods are proposed. These methods are tested on some numerical examples, and the results are compared with some known methods of the corresponding order. It is proved that the results obtained from the proposed methods are compatible with other methods. The proposed methods are tested on some problems related to engineering and science. Furthermore, applying these methods on quadratic and cubic polynomials, their stability is analyzed by means of their basins of attraction.

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Sinnige, Tessa, Markus Weingarth, Marie Renault, Lindsay Baker, Jan Tommassen, and Marc Baldus. "Solid-State NMR Studies of Full-Length BamA in Lipid Bilayers Suggest Limited Overall POTRA Mobility." Journal of Molecular Biology 426, no. 9 (2014): 2009–21. http://dx.doi.org/10.1016/j.jmb.2014.02.007.

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Knowles, Timothy J., Saeeda Bobat, Mark Jeeves, Ian R. Henderson, and Michael Overduin. "Secondary structure and 1H, 13C and 15N resonance assignments of the Escherichia coli YaeT POTRA domain." Biomolecular NMR Assignments 1, no. 1 (2007): 113–15. http://dx.doi.org/10.1007/s12104-007-9032-1.

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Arora, Himani, Juan Torregrosa, and Alicia Cordero. "Modified Potra-Pták Multi-step Schemes with Accelerated Order of Convergence for Solving Systems of Nonlinear Equations." Mathematical and Computational Applications 24, no. 1 (2018): 3. http://dx.doi.org/10.3390/mca24010003.

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In this study, an iterative scheme of sixth order of convergence for solving systems of nonlinear equations is presented. The scheme is composed of three steps, of which the first two steps are that of third order Potra-Pták method and last is weighted-Newton step. Furthermore, we generalize our work to derive a family of multi-step iterative methods with order of convergence 3 r + 6 , r = 0 , 1 , 2 , … . The sixth order method is the special case of this multi-step scheme for r = 0 . The family gives a four-step ninth order method for r = 1 . As much higher order methods are not used in practice, so we study sixth and ninth order methods in detail. Numerical examples are included to confirm theoretical results and to compare the methods with some existing ones. Different numerical tests, containing academical functions and systems resulting from the discretization of boundary problems, are introduced to show the efficiency and reliability of the proposed methods.

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Sánchez-Pulido, Luis, Damien Devos, Stéphanie Genevrois, Miguel Vicente та Alfonso Valencia. "POTRA: a conserved domain in the FtsQ family and a class of β-barrel outer membrane proteins". Trends in Biochemical Sciences 28, № 10 (2003): 523–26. http://dx.doi.org/10.1016/j.tibs.2003.08.003.

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Thoma, Johannes, Yang Sun, Noah Ritzmann та Daniel J. Müller. "POTRA Domains, Extracellular Lid, and Membrane Composition Modulate the Conformational Stability of the β Barrel Assembly Factor BamA". Structure 26, № 7 (2018): 987–96. http://dx.doi.org/10.1016/j.str.2018.04.017.

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Bennion, Drew, Emily S. Charlson, Eric Coon та Rajeev Misra. "Dissection of β-barrel outer membrane protein assembly pathways through characterizing BamA POTRA 1 mutants of Escherichia coli". Molecular Microbiology 77, № 5 (2010): 1153–71. http://dx.doi.org/10.1111/j.1365-2958.2010.07280.x.

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Browning, Douglas F., Vassiliy N. Bavro, Jessica L. Mason та ін. "Cross‐species chimeras reveal BamA POTRA and β ‐barrel domains must be fine‐tuned for efficient OMP insertion". Molecular Microbiology 97, № 4 (2015): 646–59. http://dx.doi.org/10.1111/mmi.13052.

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ur Rahman, Sadeeq, Jesús Arenas, Hülya Öztürk, Nicole Dekker, and Peter van Ulsen. "The Polypeptide Transport-associated (POTRA) Domains of TpsB Transporters Determine the System Specificity of Two-partner Secretion Systems." Journal of Biological Chemistry 289, no. 28 (2014): 19799–809. http://dx.doi.org/10.1074/jbc.m113.544627.

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