Готові списки джерел за темами / Corona degradation

Добірка наукової літератури з теми "Corona degradation"

Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Corona degradation"

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Pacheco-Pacheco, M., J. Pacheco-Sotelo, H. Moreno-Saavedra, J. A. Diaz-Gomez, A. Mercado-Cabrera, and M. Yousfi. "DBD-Corona Discharge for Degradation of Toxic Gases." Plasma Science and Technology 9, no. 6 (December 2007): 682–85. http://dx.doi.org/10.1088/1009-0630/9/6/09.

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2

Zhu, Yong, Masahisa Otsubo, and Chikahisa Honda. "Degradation of polymeric materials exposed to corona discharges." Polymer Testing 25, no. 3 (May 2006): 313–17. http://dx.doi.org/10.1016/j.polymertesting.2006.01.003.

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3

Bolobajev, Juri, Daniil Gornov, Iakov Kornev, and Sergei Preis. "Degradation of aqueous alachlor in pulsed corona discharge." Journal of Electrostatics 109 (January 2021): 103543. http://dx.doi.org/10.1016/j.elstat.2020.103543.

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4

Zhang, Li, Li Bo Liu, and Bing Sun. "Degradation of Crystal Violet by Pulsed Corona and Spark Discharge: Determination of Removal Mechanism." Advanced Materials Research 781-784 (September 2013): 338–41. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.338.

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Анотація:
The pulsed discharge includes corona discharge and spark discharge. The voltage waveforms, photo, the decoloration rate of Crystal violet in corona discharge and spark discharge were investigated respectively. The results show that the spark discharge is more intense than the corona discharge. The decoloration rate of Crystal violet by spark discharge is 90%, which is higher than that corona discharge. From the UV-Visible and FTIR spectra, we can see that the molecular conjugated system and the benzene ring of CV were damaged by pulsed discharge.
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Chen, Hai Feng. "Study of Toluene Removal by Bipolar Corona Discharge Coupled with Photocatalytic." Advanced Materials Research 955-959 (June 2014): 2357–61. http://dx.doi.org/10.4028/www.scientific.net/amr.955-959.2357.

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Experimental study the degradation efficiency of toluene by bipolar corona discharge coupled with TiO2 photocatalysis. Bipolar corona discharge can degrade the toluene efficiently and rapidly, the final products are mainly carbon dioxide and water. Toluene removal efficiency reduces when the initial concentration of toluene increasing, while toluene removal quantity is increased. Removal of toluene decreases with the gas flow rate increasing, the removal quantity first increases and then decreases. Bipolar corona discharge and a photocatalytic coupling can inprove the degradation efficiency further. Increase of the applied voltage help to improve the removal of toluene, and also to improve the coupling effect of the photocatalyst. In optimized conditions, the removal efficiency of toluene can be more than 90%. The chemical reaction process of the toluene oxidation and the TiO2 catalysis mechanism are discussed. It is pointed out that the OH* produced by corona discharge has important significance for rapid oxidation of toluene.
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Panorel, Iris, Iakov Kornev, Henry Hatakka, and Sergei Preis. "Pulsed corona discharge for degradation of aqueous humic substances." Water Supply 11, no. 2 (April 1, 2011): 238–45. http://dx.doi.org/10.2166/ws.2011.045.

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Анотація:
The research into oxidation of aqueous humic substances (HS) with pulsed corona discharge (PCD) was undertaken to estimate the energy efficiency of the treatment. The PCD system consists of a voltage pulse generator and reactor, in which the gas-phase discharge generating OH radicals and ozone treats the water showered between electrodes. The influence of HS initial concentration, pulse repetition frequency, water flow rate, and the atmosphere composition was evaluated by the decrease in total organic carbon (TOC) and color. The PCD treatment reduced TOC by 40 to 50% and the color by up to 97%. The PCD energy efficiency ranged about 20 g kW−1 h−1 in air and 30 g kW−1 h−1 in oxygen for the lowest initial color of about 50 Pt-Co degrees. Ozone contributed about 30% to the color reduction and only 15% to the reduction in TOC, indicating predominant role of OH radicals in mineralization of oxidation by-products.
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Zhu, Y., K. Haji, M. Otsubo, and C. Honda. "Surface Degradation of Silicone Rubber Exposed to Corona Discharge." IEEE Transactions on Plasma Science 34, no. 4 (August 2006): 1094–98. http://dx.doi.org/10.1109/tps.2006.876498.

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Handala, Mohand Amokrane, and Omar Lamrous. "Surface degradation of styrene acrylonitrile exposed to corona discharge." European Transactions on Electrical Power 18, no. 5 (July 2008): 494–505. http://dx.doi.org/10.1002/etep.189.

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Kireche, Nora, Sébastien Rondot, Ferroudja Bitam-Megherbi, Omar Jbara, Mickael Gilliot, and Jean-Marc Patat. "Experimental study of polymethyl methacrylate: damage under corona discharge." European Physical Journal Applied Physics 82, no. 3 (June 2018): 31301. http://dx.doi.org/10.1051/epjap/2018180073.

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Анотація:
In high-voltage applications, insulators may be exposed to corona discharges during long periods. In this experimental work, corona discharge tests of different durations are carried out in air at atmospheric pressure on polymethyl methacrylate (PMMA) samples. The resulting surface degradation is studied with several techniques. The surface damages are observed with environmental scanning electron microscope and atomic force microscopy. The results show that electrical trees occur on the surface of material and their distribution depends on the corona discharge duration. The chemical changes on PMMA surface are analyzed by Fourier transform infrared spectroscopy and a chemical degradation mechanism is proposed. Evolution of surface resistivity with corona aging is also implemented by using a classical I(V) method. In addition, to study the dielectric behavior of PMMA, the monitoring of kinetics of the trapped charge under electron irradiation in a scanning electron microscope is performed. The charging ability of PMMA under electron irradiation and its time constant of charging decrease with electrical aging.
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Ferreyra, M., B. Fina, N. Milardovich, J. C. Chamorro, B. Santamaría, and L. Prevosto. "WATER TREATMENT WITH A PULSED CORONA DISCHARGE." Anales AFA 33, Special Fluids (August 16, 2022): 11–15. http://dx.doi.org/10.31527/analesafa.2022.fluidos.11.

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Анотація:
One of the fastest growing technological applications in recent years in the area of non-thermal plasmas is the treatment of water with discharges in (and in contact with) liquids. Reactive chemical species are generated in the plasma in the gas phase and enter the liquid by diffusion or are generated at the gas-liquid interface, thus changing its physicochemical properties, without the addition of external chemical compounds. Depending on the form of application of the plasma, well-differentiated effects can be achieved: on the one hand, the purification of water through the degradation of organic pollutants, and on the other, its activation, through long-lived reactive species, for later use in seeds and food treatments. In this work, the first results obtained in the water treated with a pulsed corona discharge under different exposure times are reported. In particular, measurement results of indigo carmine degradation; electric conductivity; pH; aqueous concentrations of reactive species, such as nitrate, nitrite, hydrogen peroxide and ozone, are reported. The results are discussed and compared with published data.
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Більше джерел

Дисертації з теми "Corona degradation"

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Banaschik, Robert [Verfasser]. "Potential of Pulsed Corona Discharges Generated in Water for the Degradation of Recalcitrant Pharmaceutical Residues and for Water Disinfection / Robert Banaschik." Greifswald : Universitätsbibliothek Greifswald, 2017. http://d-nb.info/1147900051/34.

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2

Collet, Xavier. "Interactions cellulaires des HDL modulations par les enzymes lipolytiques /." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37612931t.

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"Thermal Degradation In Composite Insulation Due To Corona Discharges." Master's thesis, 2010. http://hdl.handle.net/2286/R.I.8810.

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abstract: Composite insulators on overhead lines are frequently subjected to corona discharges due to increased electric field intensities under various conditions. These discharges can cause localized heating on the surface and affect the hydrophobicity of the insulator. A study has been undertaken to quantify and evaluate the thermal degradation that composite insulation is subjected to from corona discharges. This has been conducted primarily at the power frequency (60 Hz) and at the low frequency range (37 kHz). Point to plane corona discharge experiments have been performed in the laboratory at both the frequencies and varying levels of thermal degradation has been observed. The amplitude and the frequency of current spikes have been recorded at different voltage levels. A temperature model based on the amplitude and the frequency of current data has been formulated to calculate the maximum temperature attained due to these discharges. Visual thermal degradation has been found to set in at a low frequency range while there is no visual degradation observed at power frequency even when exposed to discharges for relatively much longer periods of time. However, microscopic experiments have been conducted which revealed degradation on the surface at 60 Hz. It has also been found that temperatures in excess of 300 Celsius have been obtained at 37 kHz. This corroborates the thermo gravimetric analysis data that proves thermal degradation in silicone rubber samples at temperatures greater than 300 Celsius. Using the above model, the maximum temperature rise can be evaluated due to discharges occurring on high voltage insulation. This model has also been used to calculate the temperature rise on medium voltage distribution equipment such as composite bushings and stand-off plugs. The samples were subjected to standard partial discharge tests and the corresponding discharge magnitudes have been recorded. The samples passed the tests and the corresponding temperatures plotted have been found to be within thermal limits of the respective insulation used on the samples. The experimental results concur with the theoretical model. A knowledge of the maximum temperatures attained due to these discharges can help in design of insulation with better thermal properties.
Dissertation/Thesis
M.S. Electrical Engineering 2010
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4

Dakappa, Shakthi Prasad. "Investigations on the Corona Degradation of Polymeric Insulating Samples." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/4163.

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Анотація:
Insulators play an important role in the reliability and safe operation of EHV/UHV transmission lines. Recently several utilities in the country and elsewhere are using polymeric insulators for the high voltage transmission and distribution systems due to their advantages. Since, polymeric insulators are of recent origin and organic in nature, their long-term field performance is not yet fully understood. International standard organizations like CIGRE, IEC, IEEE etc, are currently working towards the development of methods for long term performance; some include resistance to corona, ozone, chemical attack, hydrophobicity etc, for the polymeric insulating samples. The present investigation focuses on two important aspects: (1) Investigations on the corona induced degradation on different polymeric samples under normal and due to different fog conditions. (2) Application of digital imaging techniques for the detection of corona discharges and its analysis. An experimental facility along with a new methodology is proposed and adopted for the corona induced degradation studies on polymer insulator examples. The investigations are conducted on different polymer samples for the normal and the effect of different fog environments, some interesting results are obtained, further the treated samples are analyzed using physicochemical analysis, it was found that corona treated samples present higher hydroxylation, detection of nitric acid on sample surface which cause brittle fracture of fiberglass rod of the insulator, loss of Alumina trihydrate (ATH) filler, decrease in tensile strength on theinsulator samples.It was observed from experimental investigations that corona activity isone of the important phenomena responsible for the degradation of polymeric insulators. Hence, periodic inspection of polymeric insulators and the detection of corona discharges are important in condition monitoring. Hence an attempt is made to analyze and quantify the corona discharges using image processing techniques. A color threshold based corona plasma extraction algorithm is adopted. A luminance component ‘Y’parameter is computed from the processed corona images and is shown to correlate well with the corona released power. A physical model is proposed to explain the phenomenon and is quantified by adopting the line‐detection based image processing algorithm to compute the corona spread angle. It is observed that material degradation caused by the corona with less spread angle is higher in comparison to the wide spread corona. To overcome the limitation of conventional images,high dynamic range imaging technique is employed to accurately identify the location of corona stress on the polymeric samples. Interestingly, it is observed that the correlation between the degradation patterns estimated by the corona images and Fourier transform infrared spectroscopy(FTIR) show that HDR image provides the true correlation, whereas the conventional images resulted in pseudo‐correlation.
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Частини книг з теми "Corona degradation"

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Wertheimer, M. R., and R. Bartnikas. "Degradation Effects of Plasma and Corona on Polymers." In Plasma Processing of Polymers, 435–50. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-015-8961-1_24.

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Bianchi, Nicola, Olga Prontera, Mauro Dicuio, Sergio Concetti, Alessandra Sforza, and Giovanni Corona. "Male Sex Hormones in Andrology Today." In Practical Clinical Andrology, 251–61. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11701-5_19.

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AbstractSeveral hormonal pathways are deeply involved in the regulation of male sexual function. Testosterone (T) is involved in the modulation of all steps of sexual response from the activation (sexual desire) to the resolution (orgasm and ejaculation). Androgen receptors are deeply expressed in several brain areas involved in the control of sexual response as well as in the male genitalia tract and corpora cavernosa. At these levels, T plays a crucial role in all pathways of penile erection, including nitric oxide (NO) production and degradation, adenosine signaling, calcium sensitization, and penile smooth muscle differentiation. In addition, T is also involved in the control of ejaculatory reflex modulating male genitalia tract contractility and semen bolus expulsion. The role of other sex steroids is more limited, although estrogens seem to partially regulate male sexual desire. Thyroid system is mainly involved in the control of the ejaculatory reflex, although a possible contribution in the modulation of sexual desire and penile erection has also been supposed. Available evidence suggests that prolactin (PRL) acts in the control of sexual desire either through indirect (inducing secondary hypogonadism) or direct mechanisms (modulating dopamine and serotonin central pathways). The role of other hormonal pathways in the regulation of male sexual response appears negligible.
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Goheen, S., D. Durham, M. McCulloch, and W. Heath. "The Degradation of Organic Dyes by Corona Discharge." In Dyes and Drugs, 23–34. Apple Academic Press, 2011. http://dx.doi.org/10.1201/b13128-3.

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"The Degradation of Organic Dyes by Corona Discharge." In Dyes and Drugs, 23–34. Apple Academic Press, 2016. http://dx.doi.org/10.1201/b13128-5.

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Chimaobi Agim, Leonard, Mildred Chioma Ahukaemere, Ifeyinwa Uzor, Stanley Uche Onwudike, Adaku Felicia Osisi, Ememngamha Emmanuel Ihem, and Ugochukwu Nkwopara. "Soil Degradation and the Human Condition, Including the Pandemic, Interactions, Causes, Impacts, Control Measures and Likely Future Prospects." In Soil Science - Emerging Technologies, Global Perspectives and Applications [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.101153.

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The global spread of soil degradation threatens the sustainability of human life. The review focused on soil degradation beyond global pandemic, causes, impacts, control and prospects. The work majorly concentrated on developing countries like Nigeria while giving a global view of soil degradation. In this work we attempted to show the critical nature of soil degradation, requiring serious attention like the current global pandemic known as corona virus or covid 19. We show that the causes of soil erosion are associated with the degradation of key physical and chemical soil properties. Notable physical soil property reductions are caused by water and wind erosion, including surface crust formation, and the chemical soil property reductions are associated with soil fertility decline, salinization, sodification, and other processes. Each cause of soil degradation may be traced to land management. This review notes that addressing soil degradation is important to meeting the 2015 United Nation sustainable development goals.
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Venkatesh Ramesh, Prasanna, Shruthy Vaishali Ramesh, Prajnya Ray, Aji Kunnath Devadas, Akshay Surendran, Tensingh Joshua, Meena Kumari Ramesh, and Ramesh Rajasekaran. "Going Green in Ophthalmological Practice." In Advances in Green Electronics Technologies [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.107328.

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Анотація:
The healthcare sector has had a relatively late implementation of environmental thinking in its setup. “Green electronic technologies and go green healthcare system” has recently evolved to address the biodegradability and biocompatibility issues faced by inorganic electronics and non-biodegradable materials. Green healthcare has the capability to promote global health both directly and indirectly. With the rise in environmental degradation, utilizing innovative ‘Go Green’ strategies in ophthalmology is of utmost importance. It has been structured to imbibe environmentalism into healthcare. In this chapter, we have emphasized a few simple patient point of care (POC) innovations in the field of ophthalmology that could transform the future of disease management toward a much more sustainable model by reducing resource and energy consumption. We have discussed how we innovated the novel coronicle (corona + cubicle) during the COVID-19 era, which housed all the essential ophthalmic gadgets and was interconnected using the local area network (LAN) for data access in patient care. Turning to patient counseling, we have highlighted how our innovative and cost-effective 3D augmented reality, and 4D holographic diagnostics and counseling platforms are effective in replacing the conventional paper-based system.
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Yang, Liu, Yunchuan Li, Yanfeng Yin, Qiufen Tu, Zheng Guan, Lan Li, and Lei Zhang. "Biocompatibility of Artificial Cornea Based on Genipin-Cross-Linked Amniotic Membrane." In Stem Cells and Regenerative Medicine. IOS Press, 2021. http://dx.doi.org/10.3233/bhr210023.

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Tissue engineering is a method of constructing seeding cells and artificial materials as the cytoskeleton in vitro, in order to fabricating artificial organs and tissues. Reconstruction of corneal epithelial tissue in vitro by tissue engineering technique brought hope to the corneal blind patients. In this study, we used human umbilical cord mesenchymal stem cells (hUC-MSCs) as seeding cells, and cross-linked amniotic membrane by genipin as the cytoskeleton to reconstructing corneal epithelial tissue in vitro. In addition, we tested the tenacity, hardness, degradation speed, cytocompatibility and inflammatory response in preclinical application of this new artificial material, for the purpose of finding a new approach of modifying amniotic membrane close to the feature of natural cornea. As a result, the best cross-link condition-1.0% genipin cross-linked with amniotic membrane under 45°C for 24 hr could improve the physical character of natural amniotic membrane. Genipin cross-linking makes amniotic membrane and seeded hUC-MSCs has better cytocompatibility and lower inflammatory response in preclinical application.
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Тези доповідей конференцій з теми "Corona degradation"

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Reddy, B. Subba, Shakti Prasad, and M. Rajalingam. "Studies on corona degradation of polymeric insulators." In 2014 6th IEEE Power India International Conference (PIICON). IEEE, 2014. http://dx.doi.org/10.1109/34084poweri.2014.7117651.

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Reddy, B. Subba, Shakti Prasad, and M. Rajalingam. "Studies on corona degradation of polymeric insulators." In 2014 6th IEEE Power India International Conference (PIICON). IEEE, 2014. http://dx.doi.org/10.1109/poweri.2014.7117651.

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Banaschik, Robert, Juergen F. Kolb, Klaus-Dieter Weltmann, and Petr Lukes. "Degradation of selected pharmaceuticals with pulsed corona discharges generated in water." In 2014 IEEE 41st International Conference on Plasma Sciences (ICOPS) held with 2014 IEEE International Conference on High-Power Particle Beams (BEAMS). IEEE, 2014. http://dx.doi.org/10.1109/plasma.2014.7012660.

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4

Ren Dajun, Qu Jingjing, Zhang Huiling, and Duan Ning. "Study on degradation of reactive red dye wastewater by high-voltage corona discharge." In 2011 International Conference on Electric Technology and Civil Engineering (ICETCE). IEEE, 2011. http://dx.doi.org/10.1109/icetce.2011.5775963.

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Banaschik, Robert, Juergen F. Kolb, Camelia Miron, KlausDieter Weltmann, Petr Lukes, Patrick Bednarski, Shuang Yu, Jue Zhang, and Jing Fang. "Degradation of pharmaceutical residues in water by pulsed corona discharges — Investigation of reaction mechanism." In 2015 IEEE International Conference on Plasma Sciences (ICOPS). IEEE, 2015. http://dx.doi.org/10.1109/plasma.2015.7180021.

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Ibrahim, Wan Suhaifiza W., Masmaria Abdul Majid, and Sufian Mohamad. "Degradation of thermoplastic elastomeric nanocomposite materials exposed to corona discharge and impact on hydrophobic properties." In 2013 IEEE Conference on Systems, Process & Control (ICSPC). IEEE, 2013. http://dx.doi.org/10.1109/spc.2013.6735107.

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Walker, A. B. C., T. W. Barbee, R. B. Hoover, and J. F. Lindblom. "Soft X-Ray Images of the Solar Corona With a Normal-Incidence Cassegrain Multilayer Telescope." In Space Optics for Astrophysics and Earth and Planetary Remote Sensing. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/soa.1988.wb3.

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High resolution images of the sun in the soft x-ray/extreme ultraviolet (XUV) regime have been obtainec with normal-incidence Cassegrain multilayer telescopes for the first time. The inherent energy selective property of multilayer-coated optics allowed distinct groups of emission lines to be isolated in the solar corona and the transition region. The sounding rocket borne soft x-ray telescopes [1] were launched on October 23, 1987. In addition to the Cassegrain telescopes, which provided images in bands centered at 173 Å and 256 Å, the payload contained concave spherical mirror multilayer telescopes operating at 44 Å and 256 Å, and convex multilayer mirrors which magnified and spectroscopically analyzed the image produced by a grazing-incidence primary mirror. The images obtained with the Cassegrain telescope operated in the bandpass centered at 173 Å, which is dominated by emission from the ions Fe IX and Fe X, are presented here. This emission is from coronal plasma in the temperature range 0.8 x 106 to 1.3 x 106 K. The images have angular resolution of ~1.0 to 1.5 arc seconds, and show no degradation due to x-ray scattering. Many features of coronal structure, including magnetically confined loops of hot plasma, coronal plumes, polar coronal holes, faint structures on the size scale of supergranulation and smaller, and features due to overlying cool prominences are visible in the images. The density structure of polar plumes has been derived from the observations. The images were recorded on a new type of XUV sensitive film. Our 64 second exposure of the sun in the bandpass 171 - 175 Å is shown below.
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Bilgic, Taylan Ozgur, Halil Ibrahim Uckol, Suat Ilhan, and Ozcan Kalenderli. "Corona Discharge Degradation and Dynamic Drop Tests for Hydrophobicity Evaluation of High-Temperature Vulcanizing Silicone Rubber Samples." In 2022 IEEE International Conference on High Voltage Engineering and Applications (ICHVE). IEEE, 2022. http://dx.doi.org/10.1109/ichve53725.2022.9961410.

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SANO, NORIAKI, TATSUYA FUJIMOTO, TORU KAWASHIMA, TATSUO KANKI, and ATSUSHI TOYADA. "POSSIBILITY OF UTILIZATION OF RADICALS AND IONS PRODUCED BY GASEOUS CORONA DISCHARGE TO DEGRADATION OF ORGANIC COMPOUNDS IN WATER." In Proceedings of the Third Asia-Pacific Conference. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812791924_0014.

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Saldeen, T., J. Mehta, W. Nichols, and D. Lew. "THROMBOLYSIS BY TISSUE-PLASMNOCEN ACTIVATOR AND A FIBRIN (OCEN) -DEGRADATION PRODUCT, PEPTIDE 6A, IN A CANINE MDDEL OF ELECTRICALLY-INDUCED CORONARY THROMBOSIS." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643741.

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Анотація:
Intracoronary thrombus resulting in acute myocardial ischemia can be lysed by thrombolytic agents, such as, streptokinase or t-PA. We examined the potential of a recombitant tissue-plasminogen activator (rt-PA)and a fibrin (ogen)-degradation productpentapeptide 6A, Ala-Arg-Pro-Ala-Lys, corresponding to aminoacids 43-47 in the BB-chain of fibrinogen, which causes marked increase in coronary blood flow and stimulates prostacyclin release, in restoring coronary blood flow in dqgs with experimentally-induced thrombus. An occlusive thrombus was created in the circumflex (Cx) coronary artery in 8 dcgs by electricalstimulation of the endothelial surface. The electrically-induced Cx thrombus consisted primarily of platelets and fibrin. After the occlusive thrcmbus was stable without electrical currant, rt-PA (10ug/kg/minute for 30 minutes intravenously)or peptide 6A (5 unoles/minute for 20 minutes intracorcnary) were randomly administered. Infusion of t-PA restored coronar blood flow (peak 22 ±12 ml/minute, mean ±SD) in five of seven animlas. The time to flow restoration was 12.3 ± 9.1 minutes and the reflow persistedfor20.0 ± 10.9 minutes. Peptide 6A administration also restored coronary blood flow (peak 20 ± 4 ml/ minute) in seven of eight animals with occlusive coronary thrombus. Mean time to blood flow restoration (4.3 ±2.9 minutes) wasshorter(P>0.05) than with rt-PA, but thereflow persisted only for the duration of tine infusion (16.3 ± 10.2 minutes).Peptide 6A adninistration was associatedwith a significant (P±0.05) increase in plasma 6-keto-PGF1α indicating stimulation of prostacyclin release. In addition, plasma t-PA concentrations also increased (F>0.01) at the peak effect of peptide 6A indicating releaseof endogenous t-PA as another potentialmechanism of the thrombolytic effects of peptide 6A. This study demonstrates that peptide 6A exerts coronary thrombolytic effectsccmpa rable to those of t-PA in a canine model of coronary thrombosis.
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Звіти організацій з теми "Corona degradation"

1

Varga, Gabriella A., Amichai Arieli, Lawrence D. Muller, Haim Tagari, Israel Bruckental, and Yair Aharoni. Effect of Rumen Available Protein, Amimo Acids and Carbohydrates on Microbial Protein Synthesis, Amino Acid Flow and Performance of High Yielding Cows. United States Department of Agriculture, August 1993. http://dx.doi.org/10.32747/1993.7568103.bard.

Повний текст джерела
Анотація:
The effect of rumen available protein amino acids and carbohydrates on microbial protein synthesis, amino acid flow and performance of high yielding dairy cows was studied. A significant relationship between the effective degradabilities of OM in feedstuffs and the in vivo ruminal OM degradation of diets of dairy cows was found. The in situ method enabled the prediction of ruminal nutrients degradability response to processing of energy and nitragenous supplements. The AA profile of the rumen undegradable protein was modified by the processing method. In a continuous culture study total N and postruminal AA flows, and bacterial efficiency, is maximal at rumen degradable levels of 65% of the CP. Responses to rumen degradable non carbohydrate (NSC) were linear up to at least 27% of DM. Higher CP flow in the abomasum was found for cows fed high ruminally degradable OM and low ruminally degradable CP diet. It appeared that in dairy cows diets, the ratio of rumen degradable OM to rumenally degradable CP should be at least 5:1 in order to maximize postruminal CP flow. The efficiency of microbial CP synthesis was higher for diets supplemented with 33% of rumen undegradable protein, with greater amounts of bacterial AA reaching the abomasum. Increase in ruminal carbohydrate availability by using high moisture corn increased proportions of propionate, postruminal nutrients flow, postruminal starch digestibility, ruminal availability of NSC, uptake of energy substrates by the mammory gland. These modifications resulted with improvement in the utilization of nonessential AA for milk protein synthesis, in higher milk protein yield. Higher postruminal NSC digestibility and higher efficiency of milk protein production were recorded in cows fed extruded corn. Increasing feeding frequency increased flow of N from the rumen to the blood, reduced diurnal variation in ruminal and ammonia, and of plasma urea and improved postruminal NSC and CIP digestibility and total tract digestibilities. Milk and constituent yield increased with more frequent feeding. In a study performed in a commercial dairy herd, changes in energy and nitrogenous substrates level suggested that increasing feeding frequency may improve dietary nitrogen utilization and may shift metabolism toward more glucogenesis. It was concluded that efficiency of milk protein yield in high producing cows might be improved by an optimization of ruminal and post-ruminal supplies of energy and nitrogenous substrates. Such an optimization can be achieved by processing of energy and nitrogenous feedstuffs, and by increasing feeding frequency. In situ data may provide means for elucidation of the optimal processing conditions.
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