Thematische Bibliographien / Trefoil formation

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Auswahl der wissenschaftlichen Literatur zum Thema „Trefoil formation“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 13. Februar 2022

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Zeitschriftenartikel zum Thema "Trefoil formation"

Zolotarev, Vladimir. „BIOLOGICAL FEATURES OF FRUIT FORMATION AND CROP FORMATION SEEDS OF BIRDSFOOT TREFOIL (Lotus corniculatus L.)“. Adaptive Fodder Production 2020, Nr. 1 (17.04.2020): 30–44. http://dx.doi.org/10.33814/afp-2222-5366-2020-1-30-44.

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The limited use of birdsfoot trefoil (Lotus corniculatus L.) in feed production is determined by a large shortage of its seeds. Currently, the supply of certified seeds on the commercial market is about ten times less than the scientifically based volume of the need for the seed material of this crop. The biological feature of the birdsfoot trefoil is the continuous shoot formation and growth during the entire growing season, the extended flowering period. This makes it difficult to determine the optimal timing and methods of harvesting seed stands. Harvesting is associated with large crop losses due to uneven ripening of beans and their strong cracking in hot weather with low relative humidity. The abundance of a large number of green shoots increases the humidity of the grass stand. This is very difficult to thresh and require desiccation. The choice of optimal time and method of threshing is the most difficult stage technology seed production of birdsfoot trefoil. Studies have shown that when 69–93% of the beans were browned, the biological yield reached its maximum values of 308–320 kg/ha. This period in typical weather conditions occurred 35–50 days after the beginning of flowering. During this period, the filling of seeds stopped. Crop performance has reached the standard values. The optimal period of direct threshing with pre-desiccation of the herbage, which provided the highest actual seed collection of 191–206 kg/ha, is the period of browning about 70% of the beans.

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Vasileva, Viliana, und Anna Ilieva. „Biochemical Composition and Phosphorus Use Efficiency in Some Mixtures“. International Journal of Bioassays 5, Nr. 07 (29.06.2016): 4694. http://dx.doi.org/10.21746/ijbio.2016.07.006.

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In pot trial the biochemical composition and phosphorus use efficiency of birdsfoot trefoil, sainfoin and subterranean clover grown pure and in mixtures with perennial ryegrass in the next ratios were studied in the Institute of Forage Crops, Pleven, Bulgaria: birdsfoot trefoil + perennial ryegrass (50:50%); sainfoin + perennial ryegrass (50:50%); subterranean clover + perennial ryegrass (50:50%); birdsfoot trefoil + subterranean clover + perennial ryegrass (33:33:33%); sainfoin + subterranean clover + perennial ryegrass (33:33:33%). The highest crude protein content was found in the aboveground mass of birdsfoot trefoil (19.17%) and sainfoin (19.30%). The water soluble sugars contents in mixtures was found higher compared to the pure grown legumes. Birdsfoot trefoil showed the highest phosphorus use efficiency for plant biomass accumulation and nodules formation. In mixtures the phosphorus use efficiency was found be higher as compared to the same in pure grown legumes.

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He, Guang Hua, Zhen Peng Zhang, Min Sheng Xie, Ying Xiong Wu, Dong Xing Yang, Jun Xu und Kai Xu. „Optimization the Arrangement of Power Cable Lines in Tunnel“. Applied Mechanics and Materials 678 (Oktober 2014): 513–17. http://dx.doi.org/10.4028/www.scientific.net/amm.678.513.

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In order to optimized the power cable layout design in tunnel, and improved the operation ability of the cable line, this paper analyzed the cable rating and the short-circuit force under different arrangements. 220kV cable circuit was simulated in the tunnel with conditions of the flat and the trefoil arrangements. The temperature and the rating of the 220kV cable under the condition of the two arrangements were calculated in this paper. The short circuit force peak value and its direction of the cable line under short circuit current of 50kA under the condition of the two arrangements were simulated in this paper. The results show that, the cable rating in flat arrangement is better than in trefoil formation. The value and the direction of the short circuit force in tunnel are better in flat arrangement than in trefoil formation. So it is suggested that the flat arrangement is preferred when conditions permit.

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Valenti, Maria Teresa, Giulia Marchetto, Massimiliano Perduca, Natascia Tiso, Monica Mottes und Luca Dalle Carbonare. „BEL β-Trefoil Reduces the Migration Ability of RUNX2 Expressing Melanoma Cells in Xenotransplanted Zebrafish“. Molecules 25, Nr. 6 (11.03.2020): 1270. http://dx.doi.org/10.3390/molecules25061270.

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RUNX2, a master osteogenic transcript ion factor, is overexpressed in several cancer cells; in melanoma it promotes cells migration and invasion as well as neoangiogenesis. The annual mortality rates related to metastatic melanoma are high and novel agents are needed to improve melanoma patients’ survival. It has been shown that lectins specifically target malignant cells since they present the Thomsen–Friedenreich antigen. This disaccharide is hidden in normal cells, while it allows selective lectins binding in transformed cells. Recently, an edible lectin named BEL β-trefoil has been obtained from the wild mushroom Boletus edulis. Our previous study showed BEL β-trefoil effects on transcription factor RUNX2 downregulation as well as on the migration ability in melanoma cells treated in vitro. Therefore, to better understand the role of this lectin, we investigated the BEL β-trefoil effects in a zebrafish in vivo model, transplanted with human melanoma cells expressing RUNX2. Our data showed that BEL β-trefoil is able to spread in the tissues and to reduce the formation of metastases in melanoma xenotransplanted zebrafish. In conclusion, BEL β-trefoil can be considered an effective biomolecule to counteract melanoma disease.

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Kinoshita, Koichi, Douglas R. Taupin, Hiroshi Itoh und Daniel K. Podolsky. „Distinct Pathways of Cell Migration and Antiapoptotic Response to Epithelial Injury: Structure-Function Analysis of Human Intestinal Trefoil Factor“. Molecular and Cellular Biology 20, Nr. 13 (01.07.2000): 4680–90. http://dx.doi.org/10.1128/mcb.20.13.4680-4690.2000.

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ABSTRACT The trefoil peptide intestinal trefoil factor (ITF) plays a critical role in the protection of colonic mucosa and is essential to restitution after epithelial damage. These functional properties are accomplished through coordinated promotion of cell migration and inhibition of apoptosis. ITF contains a unique three-looped trefoil motif formed by intrachain disulfide bonds among six conserved cysteine residues, which is thought to contribute to its marked protease resistance. ITF also has a seventh cysteine residue, which permits homodimer formation. A series of cysteine-to-serine substitutions and a C-terminally truncated ITF were made by PCR site-directed mutagenesis. Any alteration of the trefoil motif or truncation resulted in loss of protease resistance. However, neither an intact trefoil domain nor dimerization was required to promote cell migration. This pro-restitution activity correlated with the ability of the ITF mutants to activate mitogen-activated protein (MAP) kinase independent of phosphorylation of the epidermal growth factor (EGF) receptor. In contrast, only intact ITF retained both phosphatidylinositol 3-kinase and the EGF receptor-dependent antiapoptotic effect in HCT116 and IEC-6 cells. The inability to block apoptosis correlated with a loss of trefoil peptide-induced transactivation of the EGF receptor or Akt kinase in HT-29 cells. In addition to defining structural requirements for the functional properties of ITF, these findings demonstrate that distinct intracellular signaling pathways mediate the effects of ITF on cell migration and apoptosis.

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CHADWICK, Mark P., Bruce R. WESTLEY und Felicity E. B. MAY. „Homodimerization and hetero-oligomerization of the single-domain trefoil protein pNR-2/pS2 through cysteine 58“. Biochemical Journal 327, Nr. 1 (01.10.1997): 117–23. http://dx.doi.org/10.1042/bj3270117.

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The single-domain human trefoil proteins [pNR-2/pS2 and human intestinal trefoil factor (hITF)] have seven cysteine residues, of which six are involved in maintaining the structure of the trefoil domain. The seventh does not form part of the trefoil domain and is located three residues from the C-terminus. The ability of the pNR-2/pS2 single trefoil domain protein to dimerize was examined by using recombinant protein with either a cysteine or a serine residue at this position by equilibrium ultracentrifugation, laser-assisted desorption MS, gel filtration and PAGE. pNR-2/pS2 Cys58 formed dimers, whereas pNR-2/pS2 Ser58 did not. Experiments in which the dimer was treated with thiol agents demonstrated that the dimer was linked via a disulphide bond and that the intermolecular disulphide bond was more susceptible to reduction than the intramolecular disulphide bonds. To examine whether dimeric pNR-2/pS2 was secreted by oestrogen-responsive breast cancer cells, which are known to express pNR-2/pS2 mRNA, conditioned medium was separated on non-denaturing polyacrylamide gels, transferred to PVDF membrane and reacted with antiserum against pNR-2/pS2. Monomeric and dimeric pNR-2/pS2 were detected but the majority of the protein reactivity was associated with a larger protein. Treatment of this protein with thiol agents suggested that it is an oligomer containing pNR-2/pS2 linked to another protein by a disulphide bond. These studies suggest that the biological action of pNR-2/pS2 single-domain trefoil protein might involve the formation of homodimers or oligomers with other proteins.

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Noel, J. K., J. I. Sulkowska und J. N. Onuchic. „Slipknotting upon native-like loop formation in a trefoil knot protein“. Proceedings of the National Academy of Sciences 107, Nr. 35 (11.08.2010): 15403–8. http://dx.doi.org/10.1073/pnas.1009522107.

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Bujak, Maro, Ivana Tartaro Bujak, Sandra Sobočanec, Martina Mihalj, Sanja Novak, Anita Ćosić, Maja Tolušić Levak et al. „Trefoil Factor 3 Deficiency Affects Liver Lipid Metabolism“. Cellular Physiology and Biochemistry 47, Nr. 2 (2018): 827–41. http://dx.doi.org/10.1159/000490039.

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Background/Aims: Tff3 protein plays a well recognized role in the protection of gastrointestinal mucosa. The role of Tff3 in the metabolism is a new aspect of its function. Tff3 is one of the most affected liver genes in early diabetes and fatty liver rodent models. The aim of this study was to investigate the effect of Tff3 deficiency on lipid and carbohydrate metabolism and on markers of oxidative stress that accompanies metabolic deregulation. Methods: Specific markers of health status were determined in sera of Tff3 deficient mice, including glucose level, functional glucose and insulin tolerance. Composition of fatty acids (FAs) was determined in liver and blood serum by using gas chromatography. Oxidative stress parameters were determined: lipid peroxidation level via determination of lipid hydroperoxide and thiobarbituric acid reactive substances (TBARS), antioxidative capacity (FRAP) and specific antioxidative enzyme activity. The expression of several genes and proteins related to the metabolism of lipids, carbohydrates and oxidative stress (CAT, GPx1, SOD2, PPARα, PPARγ, PPARδ, HNF4α and SIRT1) was determined. Results: Tff3 deficient mice showed better glucose utilization in the glucose and insulin test. Liver lipid metabolism is affected and increased formation of small lipid vesicles is noticed. Formation of lipid droplets is not accompanied by increased liver oxidative stress, although expression/activity of monitored enzymes is deregulated when compared with wild type mice. Tff3 deficient mice exhibit reduced expression of metabolism relevant SIRT1 and PPARγ genes. Conclusion: Tff3 deficiency affects the profile and accumulation of FAs in the liver, with no obvious oxidative stress increase, although expression/activity of monitored enzymes is changed as well as the level of SIRT1 and PPARγ protein. Considering the strong downregulation of liver Tff3 in diabetic/obese mice, presence in circulation and regulation by food/insulin, Tff3 is an interesting novel candidate in metabolism relevant conditions.

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Churkova, Boryana, und Tatyana Bozhanska*. „Productivity and Level of Weed Infestation of Legume Meadow Grasses Depending On Grass Species and Fertilization“. International Journal of Bioassays 5, Nr. 08 (31.07.2016): 4739. http://dx.doi.org/10.21746/ijbio.2016.08.003.

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The experiment was conducted in the period of 2013-2015 in the experimental field of RIMSA-Troyan. The influence of bio-fertilizers, such as boron humate and molybdenum humate at doses of 1600 ml/ha, was studied. They were applied in the beginning of bud-formation period on legumes, such as bird's-foot-trefoil, sainfoin, and red clover. The highest positive effect of studied bio-fertilizers over productivity was found in the treatment of grassland of sainfoin. Its yield increased, after the application of boron humate, in comparison with the control by 8.3%, and molybdenum humate increased the productivity of red clover by 4.0%. Both bio-fertilizers showed a negative effect in relation to dry matter yield of bird's-foot trefoil. Foliar treatment with boron and molybdenum humate of bird's-foot-trefoil, red clover and sainfoin decreased the level of weed infestation of crops and had an influence over the biological characteristics of grass species and meteorological conditions. As a result of the influence of bio-fertilizers, the stem height of sainfoin and red clover increased, which had a favorable influence over productivity of their grasslands.

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Ivanova, N. N., O. N. Antsiferova, A. D. Kapsamun, E. N. Pavlyuchik und N. N. Ambrosimova. „Promising grass mixtures for pasture use on drained lands of the Non-Chernozem Zon“. Agricultural Science Euro-North-East 21, Nr. 5 (22.10.2020): 549–60. http://dx.doi.org/10.30766/2072-9081.2020.21.5.549-560.

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The article presents the results of eight-year (2012-2019) field research on the formation of the production process of multicomponent legume and cereal grass stands while simulating pasture use. The comparison study was carried out with the use of basic grass mixtures: meadow clover (Trifolium pratense) VIK 7 + creeping clover (Trifolium repens) VIK 70 + timothy grass (Phleum pretense L.) VIK 9 + meadow fescue (Festuca pratensis) Sakharovskaya. Studied were agrophytocenoses with the use of pasture ryegrass (Lolium perenne) VIK 66 and festulolium VIK 90. As legume components, alfalfa changeable (Medicago varia) Nakhodka, birds-foot trefoil (Lotus corniculatus) Solnyshko and creeping clover VIK 70 were used. To increase the period of use, red fescue (Festuca rubra) Sigma, having the ability to regenerate itself was included into the composition of some mixtures. It has been established that alfalfa changeable, birds-foot trefoil and red fescue are the most adaptive to the conditions of drained lands. The analysis of the results of the study of the botanical composition of grass stands showed that over 8 years of growth, cereal grasses decreased their participation in the composition of herbage from 32.0-47.8 % to 1.8-22.3 % (excluding grass stands with red fescue). Four-component grass stands based on pasture ryegrass and festulolium with the use of timothy grass proved to be the most resistant to preserving sown grass species (46.3-63.7 %) and to weed infestation. Introducing additional legume species (alfalfa changeable and birds-foot trefoil) into the herbal mixture increased the period of use and significantly raised the yield of green mass of grass stands. The highest yield of green mass was obtained by herbage with alfalfa changeable and birds-foot trefoil - 23.7-26.4 t / ha, which in the seventh year of use exceeded the base grass mixture by 3.2-6.5 t / ha or 13.5-24.6 %. The results of fodder evaluation of legume-cereal ryegrass and festulolium grass stands, which denote the high-quality green fodder in conditions of drained soils of the Upper Volga Region, are presented.

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Dissertationen zum Thema "Trefoil formation"

Váša, Lukáš. „Parametry kabelových vedení“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442551.

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In recent years, the development trend of power grids character shows increased demand for using cables of both current overhead and newly constructed lines. In order to preserve reliable operation and to predict the maintenance requirements, it is crucial to regard not only the parameters certified by manufacturers, but also externalities induced by real environment and incorporate these externalities into cable models in simulation software. The diploma thesis deals with determining of characteristic parameters of single core cables in real environment, which are affected by real grounding methods of metal shielding. The emphasis is put on analysis of current cable models in simulation software PSCAD and its evaluation using two-step experiment 1) measurement of shunt parameters in laboratory using electronic bridge model and 2) on field measurement of cable series parameters in real environment.

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Konferenzberichte zum Thema "Trefoil formation"

Zolotarev, Vladimir. „PRIMING AS THE FACTOR OF INCREASE OF EFFICIENCY SEED PRODUCTION OF BIRDSFOOT TREFOIL“. In Multifunctional adaptive fodder production. ru: Federal Williams Research Center of Forage Production and Agroecology, 2020. http://dx.doi.org/10.33814/mak-2020-24-72-94-105.

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A characteristic property of legumes is the formation of hard-stone seeds. To use such seeds for sowing, it is necessary to carry out measures to increase their seeding indicators. The article provides an overview of methods of pre-sowing preparation of seeds, priming (Seed Priming). The harvest of Birdsfoot trefoil (Lotus corniculatus L.) can contain up to 90% or more hard-stone seeds. Mechanical priming of hard-stone seeds of Birdsfoot trefoil increases their germination energy and field germination.

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