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Journal articles on the topic 'Ureids'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Stepanova, S. I., V. V. Boynik, T. M. Gontova, and S. A. Kozyra. "Determination of ureid content in shoots of russian pea shrub and siberian pea tree." Farmatsevtychnyi zhurnal, no. 2 (May 7, 2020): 59–66. http://dx.doi.org/10.32352/0367-3057.2.20.06.

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Among natural ureides, allantoin (5-ureidohydantoin or 2,5-dioxoimidazolidin-4-yl urea) is the most famous compound which have been found in various organisms: bacteria, plants, and animals. Allantoin is a product of purine catabolism in mammals (except for primates and humans) and insect larvae. It is found in many plants: comfrey (Symphytum officinale L.), soybean (Glycine hispida (Moench) Maxim), alfalfa (Medicago sativa L.), purslane (Portulaca oleracea L.). Allantoin has a reparative, antimicrobial, and anti-inflammatory effect, that substantiate it use in the composition of numerou

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2

Mora, Floribeth. "Selección de cepas nativas de Rhizobium leguminosarum bv phaseoli eficientes en fijación biológica de nitrógeno en suelos de Costa Rica." Agronomía Mesoamericana 6 (June 2, 2016): 68. http://dx.doi.org/10.15517/am.v6i0.24808.

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One hundred and thirty one strains of R. leguminosarum bv phaseoli were isolated from different bean producing zones in Costa Rica. The response of its inoculation to the Huasteco Negro (Phaseolus vulgaris L.) bean variety was evaluated under green house conditions. Pots and heat treated soil were used. The seeds inoculation was conducted using a bacterial suspension of 10° ucf/ml, approximately. Besides, anabsolute control (without inoculation, without nitrogen) and a control with nitrogen (+ 140 kg N/ha) were included. The dry weight of the nodules, dry weight of the aerial part and the urei

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3

PHOLO-TAIT, Motlalepula, Thuto KGETSE, Gaone Nthabeleng TSHEKO, et al. "Genotypic variation in response to drought stress is associated with biochemical and transcriptional regulation of ureides metabolism in common bean (Phaseolus vulgaris L.)." Acta agriculturae Slovenica 118, no. 2 (2022): 1. http://dx.doi.org/10.14720/aas.2022.118.2.2541.

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<p class="042abstractstekst">Ureidic legumes such as common bean (<em>Phaseoulus valgaris</em> L.) plants export nitrogen from the nodules to shoots and leaves as ureides during symbiotic biological nitrogen fixation. Common bean gene encoding allantoinase (allantoin amidohydrolase, EC 3.5.2.5), is a key enzyme that catalyses the hydrolysis of allantoin to allantoic acid. It plays a role in ureide generation for export and ureide catabolism to generate a nitrogen source in sinks tissues. As such, one of the adaptive mechanisms of plants to drought stress, is associated with u

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4

Thavarajah, Dil, and Rosalind A. Ball. "Drought-induced changes in free amino acid and ureide concentrations of nitrogen-fixing chickpea." Canadian Journal of Plant Science 86, no. 1 (2006): 149–56. http://dx.doi.org/10.4141/p05-054.

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The metabolic products of nitrogen (N) fixation in a legume can be amides or ureides. Chickpea (Cicer arientinum L.) is a cool-season legume which transports both ureides and amides from N fixation. Ureides are purine derivatives which are synthesized solely in the nodules. Drought-sensitive legumes accumulate ureides, but the regulation of these N fixation products during drought in chickpea is not yet known. The objectives of this study were (1) to measure the metabolic products of N fixation during drought and (2) to quantify the differences in N fixation among chickpea cultivars during dro

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5

Thu, Sandi Win, Ming-Zhu Lu, Amanda M. Carter, et al. "Role of ureides in source-to-sink transport of photoassimilates in non-fixing soybean." Journal of Experimental Botany 71, no. 15 (2020): 4495–511. http://dx.doi.org/10.1093/jxb/eraa146.

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Abstract Nitrogen (N)-fixing soybean plants use the ureides allantoin and allantoic acid as major long-distance transport forms of N, but in non-fixing, non-nodulated plants amino acids mainly serve in source-to-sink N allocation. However, some ureides are still synthesized in roots of non-fixing soybean, and our study addresses the role of ureide transport processes in those plants. In previous work, legume ureide permeases (UPSs) were identified that are involved in cellular import of allantoin and allantoic acid. Here, UPS1 from common bean was expressed in the soybean phloem, which resulte

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6

Glenister, Richard A., and Thomas A. LaRue. "A Spot Test for Estimating Ureides in Soyabean Petioles." Experimental Agriculture 22, no. 4 (1986): 405–16. http://dx.doi.org/10.1017/s0014479700014654.

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SUMMARYThe ureides allantoic acid and allantoin form a bright pink compound with acidic p-dimethylamino cinnamaldehyde. It is possible to estimate the ureide content of a soyabean petiole segment by crushing it on filter paper and developing the colour with this reagent. There is a strong correlation between the spot test and estimates from colorimetric determination of ureides. In field grown soyabeans, there was a positive correlation between the petiole ureide content during pod fill and the integrated seasonal acetylene reduction activity. The spot test can be used to identify plants with

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7

Diatloff, A., RJ Redden, and DF Herridge. "Correlation between xylem ureide levels and nodulation in field-grown Phaseolus vulgaris." Australian Journal of Experimental Agriculture 31, no. 5 (1991): 679. http://dx.doi.org/10.1071/ea9910679.

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The relationships between the relative abundance of ureide-N in xylem sap and nodulation characteristics of navy beans (Phaseolus vulgaris) were examined in a sandy field site that enabled good nodule recovery. Three management treatments of N fertiliser, inoculation and no inoculation were used in the irrigated trial. Five cultivars were sown, and they were sampled 48 and 83 days later. Plant roots were scored visually for nodule size, colour, abundance and mass. Xylem sap was extracted from shoots under mild vacuum and assayed for ureide, nitrate and amino-N contents. Main treatment effects

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8

J, PRABAKARAN, and RANGARAJAN M. "INFLUENCE OF RHIZOBIAL INOCULATION AND MICRONUTRIENTS APPLICATION ON THE PRODUCTION OF NITROGEN TRANSPORTING COMPOUNDS IN GREENGRAM (Vigna radiata L. WILCZEK)." Madras Agricultural Journal 76, October (1989): 545–52. http://dx.doi.org/10.29321/maj.10.a02063.

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Seed inoculation with rhizobial strains have significantly enhanced the production and accumulation of nitrogen transporting compounds (Ureides) over untreated control in CO 5 greengram. Among the plant parts, maximum ureide production was observed at nodules and was effectively translocated to flowers and pods through root, stem and leaves. Among the strains inoculated better effect was recorded by GG 2 followed by the other tuo strains. Maximum translocation and accumulation of ureides were recorded in leaves, stem, root and flowers at 45 DAS, whereas in pods it was found to accumulate at 60

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9

Ohyama, Takuji, Kahori Matsumoto, Haruka Goto, Akihiro Saito, and Kyoko Higuchi. "Nitrogen Metabolism in Non-Nodulated and Nodulated Soybean Plants Related to Ureide Synthesis." Nitrogen 4, no. 2 (2023): 209–22. http://dx.doi.org/10.3390/nitrogen4020014.

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Soybean plants can fix atmospheric N2 in the root nodule, a symbiotic organ with rhizobia. The primary forms of N transported from N2 fixation are ureides, allantoate, and allantoin, supplemented with asparagine. The nitrate absorbed in the roots is transported to the shoots in the forms of NO3− and asparagine with a little portion of ureides. The concentrations of N-metabolites were analyzed by capillary electrophoresis after supplying various concentrations of urea, precursors of ureides, and allopurinol, an inhibitor of xanthine dehydrogenase, to investigate the ureide synthesis pathway in

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10

Bai, Cheng, Charles C. Reilly, and Bruce W. Wood. "Nickel Deficiency Affects Nitrogenous Forms and Urease Activity in Spring Xylem Sap of Pecan." Journal of the American Society for Horticultural Science 132, no. 3 (2007): 302–9. http://dx.doi.org/10.21273/jashs.132.3.302.

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While nickel (Ni) deficiency occurs in certain agricultural crops, little is known regarding the influence of deficiency on metabolic or physiological processes. We studied the influence of Ni deficiency on the reduced-nitrogen (N) composition of early spring xylem sap of pecan [Carya illinoinensis (Wangenh.) C. Koch]. High-performance liquid chromatography (HPLC) analysis of sap composition found the presence of ureido-, amide-, and amino-N substances and that they are quantitatively influenced by tree Ni nutritional status. Ureido-N forms quantitatively dominated amide-N forms with respect t

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11

Tasca, Helena Chaves, Douglas Antônio Posso, Altemir José Mossi, et al. "Impact of Nodulation Efficiency and Concentrations of Soluble Sugars and Ureides on Soybean Water Deficit During Vegetative Growth." Nitrogen 5, no. 4 (2024): 992–1000. http://dx.doi.org/10.3390/nitrogen5040063.

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Drought is the primary limiting factor affecting soybean productivity, and is exacerbated by climate change. In legumes like soybeans, biological nitrogen fixation (BNF) is the main form of nitrogen acquisition, with nitrogen being converted into ureides. A greenhouse experiment was conducted using the soybean cultivar BMX Zeus IPRO, with two water treatments applied during the vegetative phase: control (C) and water deficit (D). The relative water content and number of nodules were reduced in the D plants. Ureide concentrations (allantoin and allantoic acid) were higher in nodules under D con

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Camargos, Liliane Santos, Leandro Ferreira Aguiar, José Antônio Carmezini, and Ricardo Antunes Azevedo. "Variation in the ureide content of Jack Bean during the reproductive stages in response to nitrate." Brazilian Archives of Biology and Technology 52, no. 3 (2009): 581–85. http://dx.doi.org/10.1590/s1516-89132009000300009.

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Nitrogen is frequently the limiting mineral nutrient for plant productivity and it is essential to obtain an understanding of how this element is assimilated and its metabolism regulated, in crop plants. The objective of this work was to study nitrogen metabolism in the tropical legume Canavalia ensiformis, a plant species used as a green manure. The nitrate dose provided changed the concentrations of ureides exported via the xylem, whilst the developmental stage alterations demonstrated to influence the form of ureide exported via the xylem. Considering the content of ureides as an indicator

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13

Wei, Yihao, Lulu Wang, Butan Qin, et al. "A New Perspective on the Role of Glutamine Synthetase in Nitrogen Remobilization in Wheat (Triticum aestivum L.)." International Journal of Molecular Sciences 22, no. 20 (2021): 11083. http://dx.doi.org/10.3390/ijms222011083.

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Glutamine synthetase (GS), a key enzyme in plant nitrogen metabolism, is closely related to nitrogen remobilization. However, how GS isoforms participate in nitrogen remobilization remains unclear. Here, the spatiotemporal expression of the TaGS gene family after anthesis was investigated, and the results showed that TaGS1;1 was mainly encoded by TaGS1;1-6A, while the other isozymes were mainly encoded by TaGS localized on the A and D subgenomes. TaGS1;2-4A/4D had the highest expression level, especially in rachis and peduncle. Furthermore, immunofluorescence showed TaGS1;2 was located in the

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14

Wei, Yihao, Lulu Wang, Butan Qin, et al. "A New Perspective on the Role of Glutamine Synthetase in Nitrogen Remobilization in Wheat (Triticum aestivum L.)." International Journal of Molecular Sciences 22, no. 20 (2021): 11083. http://dx.doi.org/10.3390/ijms222011083.

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Glutamine synthetase (GS), a key enzyme in plant nitrogen metabolism, is closely related to nitrogen remobilization. However, how GS isoforms participate in nitrogen remobilization remains unclear. Here, the spatiotemporal expression of the TaGS gene family after anthesis was investigated, and the results showed that TaGS1;1 was mainly encoded by TaGS1;1-6A, while the other isozymes were mainly encoded by TaGS localized on the A and D subgenomes. TaGS1;2-4A/4D had the highest expression level, especially in rachis and peduncle. Furthermore, immunofluorescence showed TaGS1;2 was located in the

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15

Silvente, Sonia, Lourdes Blanco, Alberto Camas, José-Luis Ortega, Mario Ramírez, and Miguel Lara-Flores. "Rhizobium etli Mutant Modulates Carbon and Nitrogen Metabolism in Phaseolus vulgaris Nodules." Molecular Plant-Microbe Interactions® 15, no. 7 (2002): 728–33. http://dx.doi.org/10.1094/mpmi.2002.15.7.728.

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The aim of this study was to evaluate the biochemical events in root nodules which lead to increased yield when bean is inoculated with a Rhizobium etli mutant (CFN037) having increased respiratory capacity. CFN037-inoculated plants had 22% more nitrogen (N) than did wild-type (CE3)-inoculated plants. Root nodule enzymes involved in nodule carbon and nitrogen assimilation as well as in ureides and amides synthesis were assessed in plants inoculated with CFN037 and the CE3. Our results show that the xylem ureides content was lower while that of amino acids was higher in CFN037- compared with CE

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16

Jirman, Josef, and Pavel Pech. "17O NMR Spectra of Acylated Ureas and Thioureas." Collection of Czechoslovak Chemical Communications 57, no. 6 (1992): 1278–81. http://dx.doi.org/10.1135/cccc19921278.

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17O NMR spectra of ten acyl- and diacylureas (I-V) and thioureas (VII-X) were measured. 17O NMR chemical shifts of the ureido oxygen in the ureas range from 240 to 310 ppm, those of the acyl oxygens from 377 to 400 ppm (acetyl groups) and 359 to 389 ppm (benzoyl groups), the half-widths being tens to hundreds Hz. Acylation of urea to the diacyl stage has an almost twice as large effect on the chemical shift of the ureido oxygen than has the monoacylation. From the viewpoint of 17O NMR shifts, no significant differences has been found in the influence of ureido and thioureido groups on the tran

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17

Mazzafera, Paulo, Kátia Viviane Gonçalves, and Milton Massao Shimizu. "Control of Allantoin Accumulation in Comfrey." Natural Product Communications 3, no. 9 (2008): 1934578X0800300. http://dx.doi.org/10.1177/1934578x0800300905.

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Comfrey, a medicinal herb with healing properties that are attributed to allantoin, was studied in this work. The accumulation and metabolism of allantoin (ALN) and its degradation product, allantoic acid (ALA), were examined. ALN was the main ureide in leaves and roots, with young leaves showing the highest content. ALA was the predominant ureide in the xylem sap, and together with ALN represented 27% of the nitrogen (N) transported in the xylem. Amino acids were the most abundant N-compound in the xylem sap with a high proportion of glutamine. [14C]Xanthine feeding experiments showed that AL

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18

Ono, Yuki, Masashige Fukasawa, Kuni Sueyoshi, et al. "Application of Nitrate, Ammonium, or Urea Changes the Concentrations of Ureides, Urea, Amino Acids and Other Metabolites in Xylem Sap and in the Organs of Soybean Plants (Glycine max (L.) Merr.)." International Journal of Molecular Sciences 22, no. 9 (2021): 4573. http://dx.doi.org/10.3390/ijms22094573.

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Soybean (Glycine max (L.) Merr.) plants form root nodules and fix atmospheric dinitrogen, while also utilizing the combined nitrogen absorbed from roots. In this study, nodulated soybean plants were supplied with 5 mM N nitrate, ammonium, or urea for 3 days, and the changes in metabolite concentrations in the xylem sap and each organ were analyzed. The ureide concentration in the xylem sap was the highest in the control plants that were supplied with an N-free nutrient solution, but nitrate and asparagine were the principal compounds in the xylem sap with nitrate treatment. The metabolite conc

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19

Bertrand, Annick, Danielle Prévost, Christine Juge, and François-P. Chalifour. "Impact of elevated CO2 on carbohydrate and ureide concentrations in soybean inoculated with different strains of Bradyrhizobium japonicum." Botany 89, no. 7 (2011): 481–90. http://dx.doi.org/10.1139/b11-034.

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Elevated CO2 increases soybean growth and photosynthesis, and the resulting additional supply of photosynthates stimulates nodule activity. To characterize its biochemical response to both CO2 and bradyrhizobial strains, soybean inoculated with three strains of Bradyrhizobium japonicum was grown in growth chambers under ambient (400 µmol·mol–1) or elevated (800 µmol·mol–1) CO2. Soluble sugars were generally more abundant in leaves and nodules under elevated CO2, while starch and pinitol were depleted, indicating that additional photosynthates were rapidly used, in particular for nodule growth

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Bai, Cheng, Charles C. Reilly, and Bruce W. Wood. "Identification and Quantitation of Asparagine and Citrulline Using High-Performance Liquid Chromatography (HPLC)." Analytical Chemistry Insights 2 (January 2007): 117739010700200. http://dx.doi.org/10.4137/117739010700200002.

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High-performance liquid chromatography (HPLC) analysis was used for identification of two problematic ureides, asparagine and citrulline. We report here a technique that takes advantage of the predictable delay in retention time of the co-asparagine/citrulline peak to enable both qualitative and quantitative analysis of asparagine and citrulline using the Platinum EPS reverse-phase C18 column (Alltech Associates). Asparagine alone is eluted earlier than citrulline alone, but when both of them are present in biological samples they may co-elute. HPLC retention times for asparagine and citrullin

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Vitória, Angela Pierre, and Ladaslav Sodek. "Xylem sap nitrogen compounds of some Crotalaria species." Scientia Agricola 56, no. 3 (1999): 733–37. http://dx.doi.org/10.1590/s0103-90161999000300031.

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Thirteen species of Crotalaria were analysed for nitrogen compounds in the xylem root bleeding sap. Amino acids were the main form of organic nitrogen found, but only traces of ureides were present. Of the four species analysed for amino acid composition, asparagine was found to be the major amino acid, accounting for over 68% of the nitrogen transported. No striking deviations from this general pattern was found between species, between vegetative and floral stages of development, or between nodulated and non-nodulated plants. It was concluded that the Crotalaria species studied here have an

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22

Sosa-Gil, Concepción, Esther Matamoros, Pedro Cintas, and Juan C. Palacios. "Bifunctional Azido(thio)ureas from an O-Protected 2-Amino-2-deoxy-d-glucopyranose: Synthesis and Structural Analyses." Molecules 29, no. 23 (2024): 5687. https://doi.org/10.3390/molecules29235687.

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This publication reports a facile and convenient preparation of tri-O-acetyl-glucopyranoses, derived from the corresponding 2-deoxyaminosugar, where the vicinal anomeric and C2 positions are decorated by azido and (thio)ureido groups, respectively. This double functionalization leads to an inherently chiral core incorporating the versatile azido and (thio)ureido linkages prone to further manipulation. The latter also provides a structural element for hydrogen-bonded donor-acceptor (HB-DA) sites, which are of immense value in organocatalytic pursuits. A computation-aided conformational analysis

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Soltabayeva, Aigerim, Aizat Bekturova, Assylay Kurmanbayeva, et al. "Ureides are accumulated similarly in response to UV-C irradiation and wounding in Arabidopsis leaves but are remobilized differently during recovery." Journal of Experimental Botany 73, no. 3 (2021): 1016–32. http://dx.doi.org/10.1093/jxb/erab441.

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Abstract Purine degradation products have been shown to play roles in plant response to stresses such as drought, salinity, extended dark, nitrogen deficiency, and pathogen infection. In this study, we used Arabidopsis wild-type (WT) and an Atxdh1-knockout mutant defective in xanthine dehydrogenase1 (XDH1) to examine the role of degraded purine metabolites in the responses to wounding or UV-C stress applied to the middle leaves of the plant. Wounding or UV-C stress in the mutant resulted in lower fresh-weight, increased senescence symptoms, and increased cell death compared to WT plants. In ad

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Kovaleva, Kseniya S., Olga I. Yarovaya, Irina A. Chernyshova, et al. "Synthesis of Norabietyl and Nordehydroabietyl Imidazolidine-2,4,5-Triones and Their Activity against Tyrosyl-DNA Phosphodiesterase 1." Molbank 2023, no. 4 (2023): M1743. http://dx.doi.org/10.3390/m1743.

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New imidazolidine-2,4,5-triones with norabietic, nordehydroabietic, and adamantane substituents were synthesized by reacting oxalyl chloride and the corresponding ureas, providing good yields. Bioisosteric replacement of the ureide group with a parabanic acid fragment made it possible to increase the solubility of compounds and conduct biological studies. The compounds inhibit the DNA repair enzyme tyrosyl-DNA phosphodiesterase 1 in submicromolar concentrations. Cytotoxic concentrations were also studied on the glioblastoma cell line SNB19.

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Lopižić, Iva. "Uloga ureda državne uprave u županijama u hrvatskome upravno-političkom sustavu." Hrvatska i komparativna javna uprava 20, no. 3 (2020): 549–77. http://dx.doi.org/10.31297/hkju.20.3.6.

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U povodu prestanka rada ureda državne uprave u županijama od 1. siječnja 2020. (dalje u tekstu: uredi) u radu se pokušava utvrditi koju su ulogu te upravne organizacije ostvarivale u hrvatskome upravno-političkom sustavu. Njihova uloga utvrđuje se pravnom analizom sektorskih zakona kojima je središnja državna vlast uredima dodjeljivala javne poslove tijekom razvoja upravljanja u hrvatskim teritorijalnim jedinicama. Osim utvrđivanja uloge ureda, na temelju provedene analize mijenjanja djelokruga ureda tijekom vremena raspravlja se o tome u kojoj je mjeri institucijski razvoj ureda pratio europs

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Raev, Lyubomir Dimitrov, Ivo Christov Ivanov, Henri Angel Astroug, Wolfgang Frey, and Silviya Georgieva Agontseva. "Synthesis of some 6-alkylureido-4-aryl-2(1H)-pyridones: further transformations and pharmacological activity." Zeitschrift für Naturforschung B 70, no. 11 (2015): 797–807. http://dx.doi.org/10.1515/znb-2015-0066.

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AbstractThe Michael addition of enaminoesters to coumarins (1) does not lead to the formation of simple adducts 3 but to the rearranged 4-aryl-2-pyridone 4a. Now, N-carbamoylation of the 6-amino-2-pyridone 4a with alkyl isocyanates and further transformation of the corresponding novel ureido-2-pyridone derivatives 6a–g into chromeno[3,4-c]pyridines 5d,g and O-acetyl derivatives 7a–g are reported. All newly synthesized compounds were characterized by means of 1H/13C NMR, MS, IR spectra and elemental analysis. The structure of the ureide 6f and of the N-cyclohexyl-O-acetyl derivative 7g were add

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Umesh Kumar, N. N., and P. Montalbini. "Ureides and Enzymes of Ureide Synthesis in Flax (Linum usitatissimum) Plants and Seeds." Journal of Plant Physiology 143, no. 3 (1994): 269–73. http://dx.doi.org/10.1016/s0176-1617(11)81630-5.

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Shutalev, A., N. Kurochkin, A. Fesenko, D. Cheshkov, and M. Davudi. "Acid-Catalyzed Rearrangement of Ureido-dihydrofurans toN-Pyrrole Ureas." Synfacts 2011, no. 02 (2011): 0132. http://dx.doi.org/10.1055/s-0030-1259386.

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Huang, Wenyue, Yifei Lu, Bi Ren, et al. "Identification and Expression Analysis of UPS Gene Family in Potato." Genes 15, no. 7 (2024): 870. http://dx.doi.org/10.3390/genes15070870.

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Ureide permeases (UPSs) mediate the transport of ureides, including allantoin and allantoate, which act as nitrogen-transporting compounds in plants and have recently been found to play a role in cellular signaling. To date, UPSs have not been reported in potato, and their identification is important for further function studies and for understanding molecular mechanisms of plant adverse responses. Based on potato genomic data, we identified 10 StUPS genes in potato (Solanum tuberosum L.). Then, we conducted a comprehensive study of the identified StUPS genes using bioinformatics methods. Geno

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Shelp, Barry J., Konrad Sieciechowicz, Robert J. Ireland, and Kenneth W. Joy. "Determination of urea and ammonia in leaf extracts: application to ureide metabolism." Canadian Journal of Botany 63, no. 6 (1985): 1135–40. http://dx.doi.org/10.1139/b85-156.

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Methods are described for the routine determination of urea and ammonia in plant tissues. Ureido compounds such as allantoin and allantoate interfere with the urea assay but can be conveniently removed by ion-exchange chromatography prior to the color reaction with α-isonitrosopropiophenone. This assay was used to examine the effect of the urease inhibitor acetohydroxamate on leaf urea levels. A survey of methods for ammonia determination showed that for plant extracts and assay mixtures containing amides, microdiffusion followed by nesslerization provided a convenient and reliable technique.

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Wood, Bruce W., Charles C. Reilly, and Andrew P. Nyczepir. "(327) Correcting Ni Deficiency in Pecan and Other Crops." HortScience 40, no. 4 (2005): 1065C—1065. http://dx.doi.org/10.21273/hortsci.40.4.1065c.

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The discovery of nickel (Ni) deficiency in field plantings of pecan [Caryaillinoinensis (Wangenh.) K. Koch] (Wood et al., 2004) has led to efforts to identify appropriate management approaches to correct tree deficiency and to identify the causes for Ni deficiency. Evaluation of several inorganic and organic forms of Ni have indicated that solutions from all sources function well to correct deficiencies when timely applied as a foliar spray to affected trees at Ni concentrations >10 mg·L-1. Addition of urea, ammonium nitrate, or nicotinic acid to Ni spray solutions increased apparent foliar

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Silva, Marcio S., Gustavo R. F. Oliveira, Edson Lazarini, et al. "Glyphosate Stimulates the Accumulation of N-Compounds, Grain Yield and Seed Vigor in Glyphosate-Resistant Soybean." Journal of Agricultural Science 10, no. 2 (2018): 157. http://dx.doi.org/10.5539/jas.v10n2p157.

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Glyphosate-resistant (GR) soybean is widely used in agriculture, however, plants exposed to herbicide show physiological changes. This study investigated the effect of treatments with glyphosate on the metabolism of N compounds, crop yield and physiological quality of seeds in GR soybean. The plants were grown in field experiment, located in the city of Selvíria, MS, Brazil. Glyphosate was applied postemergence at V4 crop stage in a dose-response, including four rates (0; 360; 720 and 1440 g e. a. ha-1) with four replicates. Crop yield, physiological and biochemical features were determined. T

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Cooper, Bret, Kimberly B. Campbell, Hunter S. Beard, et al. "A Proteomic Network for Symbiotic Nitrogen Fixation Efficiency in Bradyrhizobium elkanii." Molecular Plant-Microbe Interactions® 31, no. 3 (2018): 334–43. http://dx.doi.org/10.1094/mpmi-10-17-0243-r.

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Rhizobia colonize legumes and reduce N2 to NH3 in root nodules. The current model is that symbiotic rhizobia bacteroids avoid assimilating this NH3. Instead, host legume cells form glutamine from NH3, and the nitrogen is returned to the bacteroid as dicarboxylates, peptides, and amino acids. In soybean cells surrounding bacteroids, glutamine also is converted to ureides. One problem for soybean cultivation is inefficiency in symbiotic N2 fixation, the biochemical basis of which is unknown. Here, the proteomes of bacteroids of Bradyrhizobium elkanii USDA76 isolated from N2 fixation-efficient Pe

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López, Mariadaniela, Nacira Muñoz, Hernan Ramiro Lascano, and María Luisa Izaguirre-Mayoral. "The seed-borne Southern bean mosaic virus hinders the early events of nodulation and growth in Rhizobium-inoculated Phaseolus vulgaris L." Functional Plant Biology 44, no. 2 (2017): 208. http://dx.doi.org/10.1071/fp16180.

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To simulate seed-borne virus transmission, a noninvasive protocol was designed to infect the radicle of germinating seeds, with 100% effectiveness. Preinfection of 24-h-old black bean (Phaseolus vulgaris L.) radicles by Southern bean mosaic virus (SBMV) followed by Rhizobium inoculation 48 h later caused a drastic reduction in root nodulation. Results were attributed to active virus replication within the elongating zone of the radicle at least 32 h before Rhizobium inoculation, which elicited severe anatomical malformations; an abnormal accumulation of apoplastic reactive oxygen species in th

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López, Óscar, Susana Maza, Inés Maya, José Fuentes та José G. Fernández-Bolaños. "New synthetic approaches to sugar ureas. Access to ureido-β-cyclodextrins". Tetrahedron 61, № 38 (2005): 9058–69. http://dx.doi.org/10.1016/j.tet.2005.07.041.

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Wutzke, K. D., and J. Mix. "The metabolic fate of doubly labelled lactose-[13C, 15N]ureide after pre-dosing with different ureides." European Journal of Clinical Nutrition 64, no. 7 (2010): 733–38. http://dx.doi.org/10.1038/ejcn.2010.84.

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JACKSON, A. A., R. BUNDY, A. HOUNSLOW, J. L. MURPHY, and S. A. WOOTTON. "Metabolism of lactose-[13C]ureide and lactose-[15N,15N]ureide in normal adults consuming a diet marginally adequate in protein." Clinical Science 97, no. 5 (1999): 547–55. http://dx.doi.org/10.1042/cs0970547.

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Oral lactose-ureide is resistant to human digestive enzymes, but is fermented by the colonic microflora. Nine normal adults consuming a diet which provided 36 g of protein/day were given oral doses of lactose-[13C]ureide and lactose-[15N,15N]ureide. The appearance on breath of 13CO2 derived from lactose-[13C]ureide was followed for 48 h. The fate of 15N derived from lactose-[15N,15N]ureide was determined by measuring the recovery of 15N in stools and urine in various forms. About 80% of the label given as lactose-[13C]ureide was recovered on the breath, and about 80% of label given as lactose-

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dos Santos, Beatriz Silvério, Tassia Caroline Ferreira, Maiara Luzia Grigoli Olívio, Lucas Anjos de Souza, and Liliane Santos de Camargos. "Physiological Responses of Crotalaria spp. to the Presence of High Aluminum Availability in the Soil." Plants 13, no. 16 (2024): 2292. http://dx.doi.org/10.3390/plants13162292.

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Brazilian soils are predominantly rich in aluminum, which becomes mobile at pH < 5, affecting sensitive plants; however, some species have developed aluminum tolerance mechanisms. The purpose of this study was to compare the physiological responses of Crotalaria genus species, family Fabaceae, which have the ability to associate with nitrogen-fixing bacteria under the influence of Al3+ in the soil. The soil used was Oxisol; the experimental design was in randomized blocks in a factorial scheme (2 × 3): soil factor (available toxic aluminum content; correction of dolomitic limestone—MgCO3) a

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Wutzke, K. D., and J. Mix. "OP049 THE METABOLIC FATE OF DOUBLY LABELLED LACTOSE-[13C, 15N]UREIDE AFTER PRE-DOSING WITH DIFFERENT UREIDES." Clinical Nutrition Supplements 5, no. 2 (2010): 21. http://dx.doi.org/10.1016/s1744-1161(10)70075-2.

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Miranda, Alexandre S., Paula M. Marcos, José R. Ascenso, Mário N. Berberan-Santos, and Filipe Menezes. "Anion Binding by Fluorescent Ureido-Hexahomotrioxacalix[3]arene Receptors: An NMR, Absorption and Emission Spectroscopic Study." Molecules 27, no. 10 (2022): 3247. http://dx.doi.org/10.3390/molecules27103247.

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Fluorescent receptors (4a–4c) based on (thio)ureido-functionalized hexahomotrioxacalix[3]arenes were synthesised and obtained in the partial cone conformation in solution. Naphthyl or pyrenyl fluorogenic units were introduced at the lower rim of the calixarene skeleton via a butyl spacer. The binding of biologically and environmentally relevant anions was studied with NMR, UV–vis absorption, and fluorescence titrations. Fluorescence of the pyrenyl receptor 4c displays both monomer and excimer fluorescence. The thermodynamics of complexation was determined in acetonitrile and was entropy-driven

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Dai, Ningning, Zilong Tang, Ming Wang, Lifen Peng, Yichao Wan, and Yinchun Jiao. "Synthesis and fungicidal activity of novel ureido-substituted 1,3-benzoxazines." Journal of Chemical Research 43, no. 1-2 (2019): 53–57. http://dx.doi.org/10.1177/1747519819836503.

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Ten novel ureido-substituted 1,3-benzoxazines were synthesized in moderate yields by La(OTf)3-catalyzed reaction of some aldehydes with four ureido-substituted 2-aminomethylphenols which were prepared by a one-pot method. Evaluation of their fungicidal activity revealed that most compounds showed moderate to good activity and one of the ureido-substituted 2-aminomethylphenols showed activity against Rhizoctonia solani and Sclerotonia sclerotiorum comparable to the control compound, chlorothalonil.

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Pélissier, Hélène C., and Mechthild Tegeder. "PvUPS1 plays a role in source - sink transport of allantoin in French bean (Phaseolus vulgaris)." Functional Plant Biology 34, no. 4 (2007): 282. http://dx.doi.org/10.1071/fp06277.

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Nodulated tropical legumes such as French bean (Phaseolus vulgaris L.) receive their nitrogen via N-fixing rhizobia. The principal products of fixed nitrogen are the ureides allantoin and allantoic acid that are synthesised in root nodules and then translocated to the mature leaves of the shoot via the xylem. By feeding [14C]allantoin to mature leaves and roots of French bean plants we showed that this ureide is transported over long distances by xylem and then phloem to developing organs such as pods, root tips and growing leaves. For analysis of allantoin partitioning within the plant, conce

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Fujihara, Ami, Naohiko Shimada, Atsushi Maruyama, Kazuhiko Ishihara, Keita Nakai, and Shin-ichi Yusa. "Preparation of upper critical solution temperature (UCST) responsive diblock copolymers bearing pendant ureido groups and their micelle formation behavior in water." Soft Matter 11, no. 26 (2015): 5204–13. http://dx.doi.org/10.1039/c5sm00499c.

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Guerrero-Alburquerque, Natalia, Shanyu Zhao, Daniel Rentsch, Matthias M. Koebel, Marco Lattuada, and Wim J. Malfait. "Ureido Functionalization through Amine-Urea Transamidation under Mild Reaction Conditions." Polymers 13, no. 10 (2021): 1583. http://dx.doi.org/10.3390/polym13101583.

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Ureido-functionalized compounds play an indispensable role in important biochemical processes, as well as chemical synthesis and production. Isocyanates, and KOCN in particular, are the preferred reagents for the ureido functionalization of amine-bearing compounds. In this study, we evaluate the potential of urea as a reagent to graft ureido groups onto amines at relatively low temperatures (<100 °C) in aqueous media. Urea is an inexpensive, non-toxic and biocompatible potential alternative to KOCN for ureido functionalization. From as early as 1864, urea was the go-to reagent for polyurea

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Van Den Driessche, Mieke, Nele Van Malderen, Benny Geypens, Yvo Ghoos, and Gigi Veereman‐Wauters. "Lactose‐[¹³C]Ureide Breath Test: A New, Noninvasive Technique to Determine Orocecal Transit Time in Children." Journal of Pediatric Gastroenterology and Nutrition 31, no. 4 (2000): 433–38. http://dx.doi.org/10.1002/j.1536-4801.2000.tb07153.x.

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ABSTRACTBackgroundThe lactose‐[13C]ureide breath test (LUBT) is a novel, noninvasive test to determine orocecal transit time. Lactose ureide resists the action of brush border enzymes and is metabolized by colonic bacteria. The purpose of the present study was to adapt this breath test for children of various age groups and to determine whether it can be applied in infants, newborns, and preterms to study the development of small intestinal motility.MethodsIn a group of 20 children (3–17 years) in vitro stool analysis and in vivo LUBT results were compared. From each subject a blank stool samp

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Pham, John W., Ishwar Radhakrishnan, and Erik J. Sontheimer. "Thermodynamic and structural characterization of 2′-nitrogen-modified RNA duplexes." Nucleic Acids Research 32, no. 11 (2004): 3446–55. http://dx.doi.org/10.1093/nar/gkh658.

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Abstract 2′-aminonucleosides are commonly used as sites of post-synthetic chemical modification within nucleic acids. As part of a larger cross-linking strategy, we appended alkyl groups onto the N2′ position of 2′-amino-modified RNAs via 2′-ureido and 2′-amido linkages. We have characterized the thermodynamics of 2′-amino, 2′-alkylamido and 2′-alkylureido-modified RNA duplexes and show that 2′-ureido-modified RNAs are significantly more stable than analogous 2′-amido-modified RNAs. Using NMR spectroscopy and NMR-based molecular modeling of 2′-modified RNA duplexes, we examined the effects tha

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Wang, Xuelai, Yuchen Zhang, Zhaohui Lian, et al. "Nitrate Inhibits Nodule Nitrogen Fixation by Accumulating Ureide in Soybean Plants." Plants 13, no. 15 (2024): 2045. http://dx.doi.org/10.3390/plants13152045.

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The mechanism by which nitrate inhibits nitrogen fixation in soybean (Glycine max L.) is not fully understood. Accumulation of ureide in soybean plant tissues may regulate the nitrogen fixation capacity through a feedback pathway. In this study, unilaterally nodulated dual-root soybeans prepared by grafting were grown in sand culture. They were subjected to the removal of the nodulated side roots, and were given either nitrate supply or no supply to the non-nodulated side roots for 3 days (experiment I). Additionally, they received nitrate supply to the non-nodulated side roots for 1–14 days (

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Cai, Linhong, Lan Jiang, Cong Li, Xiaoshu Guan, Li Zhang, and Xiangnan Hu. "Multicomponent Crystal of Metformin and Barbital: Design, Crystal Structure Analysis and Characterization." Molecules 26, no. 14 (2021): 4377. http://dx.doi.org/10.3390/molecules26144377.

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The formation of most multicomponent crystals relies on the interaction of hydrogen bonds between the components, so rational crystal design based on the expected hydrogen-bonded supramolecular synthons was employed to establish supramolecular compounds with desirable properties. This theory was put into practice for metformin to participate in more therapeutic fields to search for a fast and simple approach for the screening of candidate crystal co-formers. The prediction of intermolecular synthons facilitated the successful synthesis of a new multicomponent crystal of metformin (Met) and bar

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Ledvina, Miroslav, and Jiří Farkaš. "Cyclization Dichotomy of Esters of 3-Ureido-2-cyano-2-propenoic and 3-Ureido-2-acyl-2-propenoic Acids." Collection of Czechoslovak Chemical Communications 59, no. 8 (1994): 1841–52. http://dx.doi.org/10.1135/cccc19941841.

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The preparation of E and Z isomers of 3-ureido-2-cyano-2-propenoates Ia - Id and their base-catalyzed isomerization and cyclization to 5-carboxycytosine derivatives IIa - IIf and 5-cyanouracil derivatives IIIa and IIIb is described. Also described is the preparation of 3-ureido-2-acyl-2-propenoates Va - Vd and their base-catalyzed cyclization to 5-carboxy-2(1H)-pyrimidone derivatives VIa - VIc and 5-acyluracils VIIa - VIIc.

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Geboes, Karen P., Vicky De Preter, Anja Luypaerts, et al. "Validation of lactose[15N,15N]ureide as a tool to study colonic nitrogen metabolism." American Journal of Physiology-Gastrointestinal and Liver Physiology 288, no. 5 (2005): G994—G999. http://dx.doi.org/10.1152/ajpgi.00408.2004.

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In vitro experiments have shown that fermentation of carbohydrates prevents accumulation of nitrogen in the colon. Variable results have been obtained on modulation of dietary intakes in vivo. Lactose[15N,15N]-labeled ureide has been proposed as a tool to study colonic nitrogen metabolism. However, on oral administration of the marker, different urinary excretion patterns of the 15N label have been found. In this study, 50 mg lactose[15N,15N]ureide was directly instilled in the colon through an orocecal tube to investigate the colonic handling of this molecule in a direct way. In basal conditi

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