Gotowe bibliografie tematyczne / A. porrum

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  1. Artykuły w czasopismach
  2. Rozprawy doktorskie
  3. Książki
  4. Części książek
  5. Streszczenia konferencji
  6. Raporty organizacyjne

Gotowa bibliografia na temat „A. porrum”

Autor: Grafiati
Data publikacji: 3 czerwca 2025
Data aktualizacji: 22 czerwca 2025

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Artykuły w czasopismach na temat "A. porrum"

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Shukla, Christophe, and Simon Senkus. "Potential role of leek, Allium porrum in attenuated cardiotoxicity effects of Trastuzumab." American Journal of BioMedicine 8, no. 4 (2020): 252–64. http://dx.doi.org/10.18081/2333-5106/019-1/24-37.

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Breast cancer is the most common cancer among women and HER2 (human epidermal growth factor receptor 2) is a gene that can play a role in the development of breast cancer. Herceptin (chemical name: trastuzumab), which works against HER2-positive breast cancers by blocking the ability of the cancer cells to receive chemical signals that tell the cells to grow. Leek, scientifically as Allium porrum, are related to garlic, onions, shallots, and scallions. The aim of this study was to investigate the effects of leek extracts (Allium porrum) on Trastuzumab (TRA) induced cardiotoxicity after breast cancer chemotherapy treatment. The mice in the pretreated group were given a daily dose of 1.25 ml Allium porrum for 14 days. To induce cardiac injury, TRA (2 mg/kg) in a single injection intraperitoneally and the mice were sacrificed after 72 h. This is first time investigate the cardioprotective effects of Allium porrum on TRA-induced cardiotoxicity. The TRA-treated with Allium porrum groups showed a significant improved left ventricular function EF%, CO; p < 0.05, decrease in the Creatine kinase, creatine kinase MB, lactate dehydrogenase activities and cardiac troponin I, MCP-1 and reduces an inflammatory response in comparison with the TRA-treated group. In conclusion, the present study showed first time that Leek -Allium porrum- may be have potential role in cardio-protector against toxic effects of Trastuzumab.
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Stack, Stephen M., and Dick Roelofs. "Localized chiasmata and meiotic nodules in the tetraploid onion Allium porrum." Genome 39, no. 4 (1996): 770–83. http://dx.doi.org/10.1139/g96-097.

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Allium porrum L. (cultivated leek) (2n = 4x = 32) is a fertile tetraploid that forms bivalents with pericentric chiasmata at metaphase I. To investigate the basis of this unusual behavior for a tetraploid, we describe the karyotype, axial cores, synaptonemal complexes (SCs), and meiotic nodules of A. porrum. The karyotype appears to be autotetraploid. This conclusion is also supported by presynaptic alignment of axial cores in groups of four and partner trades between pairs of SCs. Numerous early nodules are distributed all along axial cores and SCs during zygonema, but they are lost by late zygonema – early pachynema. Late (recombination) nodules (RNs) are present on SCs near kinetochores throughout the remainder of pachynema. This pattern of RNs corresponds to the pattern of pericentric chiasmata. Pachytene quadrivalents usually are resolved into bivalents because partner trades between SC lateral elements rarely occur between RNs on the same segment of SC. Thus, the patterns of crossing-over and partner trades promote balanced disjunction and high fertility in autotetraploid A. porrum. Rare quadrivalents observed at metaphase I must be due to infrequent partner trades between RNs. Polycomplexes, unusual in their number and size, were observed during zygonema. Key words : synaptonemal complex, recombination nodules, localized chiasmata, polycomplex, Allium porrum.
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Gvazava, L. N., and A. V. Skhirtladze. "Steroidal Saponin from Allium porrum." Chemistry of Natural Compounds 53, no. 6 (2017): 1093–95. http://dx.doi.org/10.1007/s10600-017-2208-8.

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Gvazava, L. N., and A. V. Skhirtladze. "Steroidal Glycoside from Allium porrum." Chemistry of Natural Compounds 54, no. 3 (2018): 487–89. http://dx.doi.org/10.1007/s10600-018-2385-0.

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Albuquerque, Shanthi Maria, and Ashoka Shenoy M. "A Brief Review on Pharmacological Potential of Allium porrum." International Journal of Research and Review 11, no. 5 (2024): 496–502. http://dx.doi.org/10.52403/ijrr.20240557.

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Allium porrum is a major vegetable crop worldwide. Most of its production and consumption is in western Europe, with France and Belgium being the world's greatest producers. Dry leek is the most consumed vegetable after potato. Allium porrum is an herbaceous plant from the Liliaceae family and has been widely used in Persian foods as a flavour component. The Allium ampeloprasum is categorized into wild leek, cultivated leek, kurrat, pearl onion, tare and great-headed garlic based on their diverse cytogenetic and morphological characters. Leeks are known for their characteristic flavour and medicinal value. Leeks have excellent nutritional properties and are a rich source of bioactive compounds and phytochemicals, Leaves contains lot of fibre, calcium, phosphorus, vitamin A, vitamin B1, vitamin B2 and vitamin C. Consumption of leeks causes a reduction of the risk of hypercholesterolemia, blood pressure, arteriosclerosis and platelet aggregation which helps in the prevention of cardiovascular diseases. Besides these, the leeks have antimicrobial activity against various bacteria and fungi and viruses. Keywords: Allium, Allium porrum, leek, gallic acid, organosulfur compounds, pharmacological activities.
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S., Odeyemi Omonike, Umar Yahaya A., and S. Abdulsalami M. "Antitrypanosomal Activity of Allium porrum Ethyl Acetate Bulb Extract in Trypanosoma brucei brucei Experimentally Infected Wister Albino Rats." European Journal of Medicinal Plants 19, no. 4 (2017): 1–8. https://doi.org/10.9734/EJMP/2017/34418.

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<strong>Aims: </strong>The present study investigated the antitrypanosomal activity of crude ethyl acetate bulb extracts of <em>A. porrum</em> plant against <em>T. b. brucei</em>. <strong>Methodology: </strong>Twenty five male albino rats were divided into five groups and infected with x10<sup>6</sup>/ml of <em>T. b. brucei</em>. Group 1 was infected and untreated while groups 2-4 were infected and treated with single intraperitoneal injection 50, 75 and 100 mg/kg of ethyl acetate extract of <em>A. porrum</em> while a single dose 3.5 mg/kg diaminazene aceturate was administered to group 5 when parasitaemia was established at x10<sup>6 </sup>day 5 post infection. <strong>Results: </strong>Clinical manifestations of trypanosomoses such as increased rectal temperature, weakness and dullness were observed in experimental rats in all the groups. There was decrease packed cell volume (PCV) and red blood cell count (RBC) in group 1-4 which was not significant (p&gt;0.05) while group 5 had a significant increase (p&lt;0.05) in PCV and non-significant increase (p&gt;0.05) in RBC post treatment. There were feeble changes in the pre-treatment and post-treatment parasitemia level in the groups treated with ethyl acetate extract of <em>A. porrum </em>while there was significant clearance in parasitemia in the control group. <strong>Conclusion: </strong>Interperitoneal injection of ethyl acetate extracts of <em>A. porrum </em>at the dose and concentration used in this study, has trypanosomal reduction activity in wister rats.
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CAROTENUTO, A., E. FATTORUSSO, V. LANZOTTI, and S. MAGNO. "Spirostanol saponins of Allium porrum L.fn1." Phytochemistry 51, no. 8 (1999): 1077–82. http://dx.doi.org/10.1016/s0031-9422(98)00712-2.

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Fattorusso, Ernesto, Virginia Lanzotti, Orazio Taglialatela-Scafati, and Carla Cicala. "The flavonoids of leek, Allium porrum." Phytochemistry 57, no. 4 (2001): 565–69. http://dx.doi.org/10.1016/s0031-9422(01)00039-5.

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Armentia, A., M. Lombardero, S. Fernàndez, et al. "Occupational rhinitis to leek (Allium porrum)." Allergy 60, no. 1 (2005): 132–33. http://dx.doi.org/10.1111/j.1398-9995.2004.00605.x.

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Andreeva, Zornitza, Angela Y. Y. Ho, Michelle M. Barthet, et al. "Phospholipase D family interactions with the cytoskeleton: isoform delta promotes plasma membrane anchoring of cortical microtubules." Functional Plant Biology 36, no. 7 (2009): 600. http://dx.doi.org/10.1071/fp09024.

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Phospholipase D (PLD) is a key enzyme in signal transduction – mediating plant responses to various environmental stresses including drought and salinity. Isotype PLDδ interacts with the microtubule cytoskeleton, although it is unclear if, or how, each of the 12 PLD isotypes in Arabidopsis may be involved mechanistically. We employed RNA interference in epidermal cells of Allium porrum L. (leek) leaves, in which the developmental reorientation of cortical microtubule arrays to a longitudinal direction is highly sensitive to experimental manipulation. Using particle bombardment and transient transformation with synthetic siRNAs targeting AtPLDα, β, γ, δ, ॉ and ζ, we examined the effect of ‘cross-target’ silencing orthologous A. porrum genes on microtubule reorientation dynamics during cell elongation. Co-transformation of individual siRNAs together with a GFP-MBD microtubule-reporter gene revealed that siRNAs targeting AtPLDδ promoted, whereas siRNAs targeting AtPLDβ and γ reduced, longitudinal microtubule orientation in A. porrum. These PLD isotypes, therefore, interact, directly or indirectly, with the cytoskeleton and the microtubule-plasma membrane interface. The unique response of PLDδ to silencing, along with its exclusive localisation to the plasma membrane, indicates that this isotype is specifically involved in promoting microtubule-membrane anchorage.
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Rozprawy doktorskie na temat "A. porrum"

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Eavis, Roger Malcolm. "The effects of temperature and solar radiation on the growth and development of leeks (Allium porrum L.)." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309079.

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Bessoule, Jean-Jacques. "Les ACYL-CoA élongases d'Allium porrum : solubilisation, purification partielle, essais de reconstitution et analyse théorique de leur fonctionnement." Bordeaux 2, 1989. http://www.theses.fr/1989BOR22A06.

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Mise en evidence d'activite de synthese d'acides gras a tres longue chaine dans la membrane externe des mitochondries de levure, aucune activite d'elongation d'acyl-coas n'est mesuree a partir d'organelles purifiees (mitochondries, chloroplastes) de vegetaux superieurs. Les acyl-coa elongases du systeme endomembranaire des cellules d'epiderme d'allium porrum sont solubilisees par du triton x-100, deux activites distinctes sont mises en evidence, une allongeant preferentiellement le stearyl-coa, l'autre l'eicosanoyl-coa. La stearyl-coa elongase est purifiee par chromatographie sur colonne echangeuse d'ions et de filtration sur gel
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Quiroz, Cornejo Karen Vanessa. "Efecto de la temperatura y la concentración sobre la capacidad antioxidante del extracto acuoso del poro (Allium ampeloprasum L., variedad porrum)." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2013. https://hdl.handle.net/20.500.12672/14665.

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Publicación a texto completo no autorizada por el autor<br>Determina el efecto de la temperatura y la concentración sobre la capacidad antioxidante del extracto acuoso del Poro (Allium ampeloprasum L, variedad porrum). El presente estudio es de tipo Analítico, Experimental, Longitudinal, Prospectivo, de enfoque cuantitativo,la muestra biológica fue la Planta de Poro (Allium ampeloprasum L, variedad porrum) parte blanca y verde. Se elaboró un extracto acuoso al 25%. Al analizar la capacidad para reducir el radical DPPH, muestra que el poro verde ejerce un mejor poder reductor de radicales libres notablemente mayor, conforme se observa el valor CI 50 para el poro verde es de10.6 mg/ml, mientras que para el poro blanco es de 18.6 mg/ ml, lo que indica que con una concentración menor de la muestra, se logra alcanzar un 50% de reducción del DPPH. Se utilizó la prueba de t student para el análisis, se observó que el p-valor es 0.86, siendo mayor a 0.05 no es significativamente diferente. Las concentraciones de extracto acuoso de Poro parte blanca y parte verde, influyen en su capacidad antioxidante, pero, la temperatura ebullición no modifica esta capacidad.<br>Tesis
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Moreau, Patrick. "Etude in vivo du transfert intermembranaire des lipides et des AGTC à la membrane plasmique de plantules étiolées d'Allium porrum L." Bordeaux 2, 1986. http://www.theses.fr/1986BOR22006.

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Les plantules etiolees d'a. Porrum representent le premier modele experimental qui permettra d'etudier in vivo chez les plantes, les mecanismes du transport intracellulaire des lipides et des acides gras. Par le biais des lipides membranaires, ce systeme permettra donc d'aborder l'etude des evenements qui dirigent et qui controlent la biogenese de la membrane plasmique chez un vegetal superieur.
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Sturbois, Bénédicte. "Transfert vésiculaire des lipides chez Allium porrum L. : effet de la température in vivo, reconstitution in vitro, isolement des intermédiaires vésiculaires." Bordeaux 2, 1996. http://www.theses.fr/1996BOR28416.

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Moreau, Patrick. "Etude in vivo du transfert intermembranaire des lipides et des AGTLC à la membrane plasmique de plantules étiolées d'Allium porrum L." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37599755f.

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Schneider, Florence. "Vers une modulation des cires épicuticulaires chez Allium Porrum L : inhibition du transfert et de la biosynthèse des acides gras à trés longue chaîne." Bordeaux 2, 1995. http://www.theses.fr/1995BOR28368.

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Arnault, Claude. "Relations entre un insecte phytophage et sa principale plante - hôte : cas de la teigne (Acrolepiopsis assectella Z., Lépidoptère) et du poireau (Allium porrum L., Liliacée)." Lyon 1, 1986. http://www.theses.fr/1986LYO10041.

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Auger, Jacques. "Analyse et synthèse de substances allélochimiques des allium (liliacées) et synthèse d'analogues : applications à quelques comportements d'insectes inféodés ou non au poireau (allium porrum L.)." Tours, 1987. http://www.theses.fr/1987TOUR4012.

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L'odeur de poireau, a son émission, contient du thiosulfinate de propyle et peu ou pas de disulfures. Les fèces des a. A. Et p. X. Contiennent des disulfures. Différents produits de références et des analogues ont été synthétisés et testées en olfactométrie vis a vis des larves de plusieurs papillons. L'odeur des feces de a. A. Et p. X. Attire d. P. , parasitoide de ces espèces. L'incidence des différentes substances sur le comportement de ponte des adultes de a. A. Est etudiée.
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Arnault, Claude. "Relations entre un insecte phytophage et sa principale plante-hôte cas de la Teigne, Acrolepiopsis assectella Z., Lépidoptère, et du Poireau, allium porrum L., Liliacée." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb375955417.

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Książki na temat "A. porrum"

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Internationale Thesaurus-Kommission, ed. Pars 1, P-Porrum, Fasc. IX, perdomo - perfundo. DE GRUYTER, 1995. http://dx.doi.org/10.1515/9783110959239.

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Internationale Thesaurus-Kommission, ed. Pars 1, P-Porrum, Fasc. VIII, pensio - perdomo. DE GRUYTER, 1994. http://dx.doi.org/10.1515/9783110959253.

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Internationale Thesaurus-Kommission, ed. Vol. X, Pars 1: p - porrum, Fasc. XV, pius - plene. DE GRUYTER, 2005. http://dx.doi.org/10.1515/9783110932089.

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Internationale Thesaurus-Kommission, ed. Vol. X, Pars 1: p - porrum, Fasc. XI, pernumero - persuadeo. DE GRUYTER, 1998. http://dx.doi.org/10.1515/9783110948103.

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Internationale Thesaurus-Kommission, ed. Vol. X, Pars 1: p - porrum, Fasc. X, perfundo - pernumero. DE GRUYTER, 1997. http://dx.doi.org/10.1515/9783110948110.

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Internationale Thesaurus-Kommission, ed. Vol. X, Pars 1: p - porrum, Fasc. XVI, plenesco - pomifer. DE GRUYTER, 2007. http://dx.doi.org/10.1515/9783110977769.

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Internationale Thesaurus-Kommission, ed. Vol. X, Pars 1: p - porrum, Fasc. V, pastor - paucus. DE GRUYTER, 1990. http://dx.doi.org/10.1515/9783110960105.

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Ferguson, Carole Jane. Biochemical aspects of osmopriming in leek (Allium porrum L.) seeds. University of Manchester, 1995.

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Khazanehdari, Kamal Aldin. Meiotic chromosome behaviour and somatic chromosome variation in the leek (Allium porrum L.). University of Birmingham, 1995.

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II, Université de Bordeaux, ed. Etude in vivo du transfert intermembranaire des lipides et des AGTLC à la membrane plasmique de plantules étiolées d'Allium porrum L. A.N.R.T. Université Pierre Mendès France Grenoble 2, 1986.

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Części książek na temat "A. porrum"

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Montag, Andreas. "Lauch, Porree (Allium porrum ssp. porrum)." In Pflanzen und Haut. Springer Berlin Heidelberg, 2023. http://dx.doi.org/10.1007/978-3-662-63014-3_91.

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Khare, C. P. "Allium porrum Linn." In Indian Medicinal Plants. Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-70638-2_83.

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Christophe, Wiart. "Leek (Allium porrum L.)." In Handbook of Medicinal Plants of the World for Aging. CRC Press, 2023. http://dx.doi.org/10.1201/9781003301455-7.

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Sastry, K. Subramanya, Bikash Mandal, John Hammond, S. W. Scott, and R. W. Briddon. "Allium ampeloprasum var. porrum (Leek)." In Encyclopedia of Plant Viruses and Viroids. Springer India, 2019. http://dx.doi.org/10.1007/978-81-322-3912-3_26.

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Lessire, René, Jean-Jacques Bessoule, and Claude Cassagne. "Acyl-CoA Elongation Systems in Allium porrum Microsomes." In The Metabolism, Structure, and Function of Plant Lipids. Springer New York, 1987. http://dx.doi.org/10.1007/978-1-4684-5263-1_95.

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Lessire, R., J. J. Bessoule, and C. Cassagne. "Properties of Partially Purified Acyl-CoA Elongase from Allium Porrum Leaves." In Biological Role of Plant Lipids. Springer US, 1989. http://dx.doi.org/10.1007/978-1-4684-1303-8_32.

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Bessoule, J. J., R. Lessire, and C. Cassagne. "Techniques for the Purification of Acyl-CoA Elongase from Allium Porrum Leaves." In Biological Role of Plant Lipids. Springer US, 1989. http://dx.doi.org/10.1007/978-1-4684-1303-8_31.

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Malika, Akermoun, Testet Eric, Santarelli Xavier, Cassagne Claude, and Bessoule Jean-Jacques. "The Plastidial Lyso-Pc Acyltransferase from Allium Porrum Leaves: Interaction With Metal Salts and Partial Purification." In Advanced Research on Plant Lipids. Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-0159-4_45.

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Amijee, F., D. P. Stribley, and P. B. Tinker. "Soluble carbohydrates in roots of leek (Allium porrum) plants in relation to phosphorus supply and VA mycorrhizas." In Plant Nutrition — Physiology and Applications. Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0585-6_27.

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Christel, Spinner, Levannier Karine, Lessire René, Lellouche Jean-Paul, Mioskovski Charles, and Cassagne Claude. "Characterization of the trans 2–3 enoyl-CoA reductase of the acyl-CoA elongase from leek (Allium porrum L.)." In Plant Lipid Metabolism. Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-015-8394-7_36.

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Streszczenia konferencji na temat "A. porrum"

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"Evaluation of leek (Allium porrum) genomic polymorphism using the AFLP method." In Plant Genetics, Genomics, Bioinformatics, and Biotechnology. Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, 2019. http://dx.doi.org/10.18699/plantgen2019-047.

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"Effect of Beauveria bassiana on Growth and Bioactivities of Leek Allium porrum." In Nov. 16-17, 2020 Johannesburg (SA). Eminent Association of Pioneers, 2020. http://dx.doi.org/10.17758/eares10.eap1120115.

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Анисимова, О. К., та М. А. Филюшин. "ВАРИАБЕЛЬНОСТЬ И ПРОФИЛЬ ЭКСПРЕССИИ ГЕНА-ГОМОЛОГА VTC2 У ЛУКА-ПОРЕЯ (ALLIUM PORRUM L.)". У Биотехнология в растениеводстве, животноводстве и сельскохозяйственной микробиологии. Crossref, 2020. http://dx.doi.org/10.48397/arriab.2020.20.001.

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GONChAROVA, El'za. "Vavilovskaya collection of leek (Allium porrum L.) and its significance for breeding and plant production." In Multifunctional adaptive fodder production 29 (77). Federal Williams Research Center of Forage Production and Agroecology, 2022. http://dx.doi.org/10.33814/mak-2022-29-77-159-167.

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The article discusses the results of a comprehensive study of the biological and adaptive potential of the leek (Allium porrum L.) gene pool, including the features of morphological, physiological and biochemical characteristics of plants (and varieties) under optimal and unfavorable conditions of vegetation and autumn-winter storage and identifying sources of high productivity, adaptability and quality for use in breeding and vegetable growing. 140 varieties of leek were studied, representing the world diversity of this crop (VIR collection). The experiments on the effect of hydrothermal stress on growth activity, as well as physiological characteristics, made it possible to identify high-quality sources during harvesting and storage, as well as varieties with increased keeping quality.
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Voß, J., T. Reimer, B. Gerber, and DU Richter. "Einfluss von Allium porrum – Extrakt (Lauch) im Vergleich zu synthetischem Quercetin und Rutin auf beninge und normale hormonrezeptorpositive und -negative Mammazellen." In 38. Jahrestagung der Deutschen Gesellschaft für Senologie. Georg Thieme Verlag KG, 2018. http://dx.doi.org/10.1055/s-0038-1651814.

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Häbler, F., T. Mayser, B. Gerber, T. Reimer, and DU Richter. "Einfluss von Allium porrum-Extrakt im Vergleich zum synthetischen Rutin und Folsäure auf maligne hormonrezeptorpositive und -negative Mammakarzinomzelllinien, sowie auf humane Mammaepithelzellen (MCF-7, Hs578T, HMEpC)." In 62. Kongress der Deutschen Gesellschaft für Gynäkologie und Geburtshilfe – DGGG'18. Georg Thieme Verlag KG, 2018. http://dx.doi.org/10.1055/s-0038-1671026.

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Cance, J. C. "Characterization of 316L Stainless Steel Composite Metal Foam Joined by Solid-State Welding Technique." In Porous Metals and Metallic Foams. Materials Research Forum LLC, 2024. http://dx.doi.org/10.21741/9781644903094-2.

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Abstract. In previous studies, composite metal foams (CMF) have shown exemplary mechanical performance under impact which has made them prime candidates for protection of transported passengers and cargo. [1] Materials utilized in such applications often require joining to form structures and geometries that are far more complex or impossible to produce in an as-manufactured state. Welding methods are popular in the joining of metals with solid-state welding processes such as induction welding being of particular interest in the studies to be discussed. In this study, various thicknesses of 316L stainless steel CMF are manufactured through powder metallurgy technique and welded using Induction Welding. The mechanical properties of the weldments were studied through uniaxial tensile tests while microstructural characterization of the weldment within the joint interface and heat-affected zone (HAZ) are evaluated using scanning electron microscopy. The combination of these evaluations grant insight on the effects of various weld parameters (e.g., welding temperature, workpiece thickness, flux, and welding environment) as well as the suitability and restrictions of induction welding in the joining of 316L Stainless Steel CMF.
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Uhlig, M. "Opportunities of Metal Structures in Cooling Systems." In Porous Metals and Metallic Foams. Materials Research Forum LLC, 2024. http://dx.doi.org/10.21741/9781644903094-7.

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Abstract. The growing market of power electronics in the mobility sector leads to an increasing demand for cooling systems. In the project this need to improve performance is to be met by adapting the cooling structure. Depending on the intended application of cooling systems - automotive, railway and aerospace - different requirements are defined for the cooling process resulting in varying conditions for the design. So metallic foam structures are under investigation because of their high inner surface. Two different process lines are most suitable for the aimed application. The production and optimization of galvanized foams seems to be the most lucrative for a low-cost product, while 3D printing is currently only worthwhile for special applications such as aerospace. As a potentially more cost-effective process, which is already being used for small series, investment casting structures are being investigated as an alternative. Depending on the production process chosen, corresponding requirements for structure creation suitable for production apply. Corresponding process adaptations are also taken into consideration. The first optimization step is an analysis of the conventional open cellular metal foam structures using CT. The results of the CT evaluation, together with the empirical data for fluid mechanical and thermal characteristics, are the basis for a later replacement model of the CFD simulation. Besides the Kelvin cell, which is a good geometrical substitute for the conventional structures that copy the Polyurethan master pattern, other cell types are also considered. Alternatively, structures based on mathematical cells e.g. Schwarz P/D, offer the possibility of separating two media to create cross-flow or counter-flow heat exchangers. Regardless of the chosen system, the main task of the investigation is to find an optimum of the relation between pressure drop and heat transfer performance for the corresponding system and to design the cell arrangement in a way that is suitable for manufacturing. This justifies, among other things, the investigation of a minimal surface structure, which at first seems contradictory. Considering the manufacturing process to be defined beforehand, requirements such as self-supporting design (additive process) and free accessibility (electroplating) also play an important role in the structure development. Thus, the goal is still to optimize the cell and web geometry accordingly.
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Mare, Esmari. "Analytical Determination of the Geometrical Properties of Open-Celled Metal Foams Under Compression." In Porous Metals and Metallic Foams. Materials Research Forum LLC, 2024. http://dx.doi.org/10.21741/9781644903094-5.

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Abstract. Several studies in the literature have been devoted to the permeability prediction of metal foams, including that involving the Representative Unit Cell (RUC) model. The RUC modelling approach is an attractive modelling method due to the simple rectangular geometry, as well as its satisfying performance in comparison to other models and experimental data as proven elsewhere in the literature for porous media. The subject of compression of metal foams has been addressed elsewhere in the literature, but this study is the first to involve an all-inclusive analytical model where both streamwise and transverse compression are accounted for. The Darcy and Forchheimer permeability coefficients of the compressed foam (or three-strut) RUC model are presented. Furthermore, a geometric approach requiring measured geometric parameters and a combined geometric-kinetic approach involving measured permeability coefficients are included for determining the specific surface area. Geometric parameters required to determine the permeability and specific surface area predictions using the compressed foam RUC model include the uncompressed porosity, pore dimension and strut diameter, as well as the compression factor. The model is evaluated through comparison with available experimental data and empirical models obtained from the literature for compressed metal foams. The compressed RUC model predictions produce expected tendencies of geometrical parameters of metal foams under compression and the comparison with experimental data reveal satisfactory results.
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Amoafo-Yeboah, N. T. "Surface Emissivity Effect on the Performance of Composite Metal Foam against Torch Fire Environment." In Porous Metals and Metallic Foams. Materials Research Forum LLC, 2024. http://dx.doi.org/10.21741/9781644903094-1.

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Abstract. According to the US Department of Transportation (DOT), there are millions of liters of hazardous materials (HAZMATS) transported each year via railroad. This has translated to stringent safety measures taken to alleviate the effects of accidents involving tank cars carrying these HAZMATs. One of such measures is in the creation of the thermal protection system of tank cars in which the tank car must have sufficient thermal resistance when subjected to a simulated pool fire for 100 mins and a torch fire for 30 mins without its back plate temperature exceeding 427 ºC at any point of time. This requires a suitable material as a thermal blanket and insulation in tank car lining. Steel-steel composite metal foam (S-S CMF) is a novel metal foam with unique properties of high strength to density ratio, lightweight, and high energy absorption. It consists of metallic hollow spheres that are closely packed within a metal matrix. The large percentage of air within the hollow spheres provide both lightweight and insulating effects for CMF. S-S CMF is being investigated using the standard torch fire test requirement to determine its suitability as a material for tank car thermal protection. This is accomplished by developing a numerical model using the Fire dynamics simulator (FDS) as a form of validation for experimental work done. To properly evaluate this, there are various thermal properties of S-S CMF that need to be established for predicting CMF’s thermal response. Surface emissivity has been a challenging property to evaluate and hence this study focuses on developing an experimental and numerical procedure in evaluating this property for composite materials such as CMF. Preliminary data shows an acceptable prediction of emissivity, which will be applied to the FDS model for the torch fire test.
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Raporty organizacyjne na temat "A. porrum"

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Grote, Christopher John. Hierarchical Porous Structures. Office of Scientific and Technical Information (OSTI), 2016. http://dx.doi.org/10.2172/1257114.

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Penczek, John, and Rosemary L. Smith. Electroluminescing Porous Silicon Device. Defense Technical Information Center, 1995. http://dx.doi.org/10.21236/ada299433.

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Dillon, J. Combustion in porous media. Office of Scientific and Technical Information (OSTI), 1999. http://dx.doi.org/10.2172/765956.

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Dickenson, Eric. Transport in porous media. Office of Scientific and Technical Information (OSTI), 1996. http://dx.doi.org/10.2172/576744.

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Marsden, S. S. Foams in porous media. Office of Scientific and Technical Information (OSTI), 1986. http://dx.doi.org/10.2172/5866567.

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Rimsza, Jessica, Tina Nenoff, Matthew Hurlock, and Matthew Christian. Design of CO2 Selective Type 3 Porous Liquids Through Porous Host Morphology. Office of Scientific and Technical Information (OSTI), 2023. http://dx.doi.org/10.2172/2432046.

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Joel Koplik. Transport processes in porous media. Office of Scientific and Technical Information (OSTI), 2006. http://dx.doi.org/10.2172/877708.

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Dehoff, Ryan R., and Michael M. Kirka. Additive Manufacturing of Porous Metal. Office of Scientific and Technical Information (OSTI), 2017. http://dx.doi.org/10.2172/1362246.

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García-García, Jorge, David C. López-Valenzuela, and Enrique Montes-Uribe. Porqué Colombia no exporta más. Banco de la República de Colombia, 2020. http://dx.doi.org/10.32468/be.1139.

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Este trabajo explica cómo los costos de comerciar (protección y otros costos) desestimulan las exportaciones manufactureras y por qué Colombia exporta mayoritariamente productos primarios. Para esto, además de una revisión de literatura y una descripción del desempeño exportador colombiano, se presenta una metodología que mide la protección total causada por el arancel y las medidas no arancelarias (MNA) y que permite generar una serie de la protección verdadera para el período 1950-2019. Los resultados muestran que el país no ha explotado su potencial exportador de manufacturas porque los incentivos para hacerlo han sido magros, un resultado de la alta protección a la producción local, de una infraestructura escasa y de unos servicios logísticos costosos.
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Bayu Aji, L., I. Winter, T. Fears, and S. Kucheyev. Sculpting Non-Machinable Porous Materials. Office of Scientific and Technical Information (OSTI), 2020. http://dx.doi.org/10.2172/1668504.

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