784 research outputs found
Asymmetric organocatalytic anthrone additions to activated alkenes
No full textAsymmetric organocatalytic additions of anthrones to activated alkenes are discussed. The reaction between anthrone or dithranol and ?,?-unsaturated aldehydes is catalyzed by diphenylprolinol trimethylsilyl ether in toluene at ?40 °C, giving the Michael adducts with good yields and enantioselectivities. Bifunctional amino-thioureas efficiently catalyze the additions of anthrones to both nitroalkenes and maleimides, and high enantioselectivities can be achieved in both instances at room temperature. In the case of nitroalkenes, a Michael addition takes exclusively place. Anthrone generally gives Diels–Alder cycloadducts in the reaction with maleimides, while dithranol affords the Michael adducts. Transition state working models in which the bifunctional catalyst binds simultaneously to the alkene and to the anthrone enolate account for the stereochemical outcome of these additions
Highly enantioselective cascade synthesis of spiropyrazolones
No full textAn efficient synthesis of spiropyrazolones based on organocatalysis is described. The reaction between pyrazolones, enolizable aldehydes and enals is catalyzed by secondary amine catalysts and affords the final spiro compounds bearing four contiguous chiral centers in good yields and excellent diastereo- and enantioselectivities
Bifunctional thiourea-catalyzed asymmetric addition of anthrones to maleimides
No full textFor the first time, the addition of anthrones to maleimides catalyzed by bifunctional thiourea catalysts is reported. The thiourea moiety is able to activate the maleimide and the tertiary amine deprotonates the anthrone, furnishing the final Diels–Alder or Michael adducts in excellent yields and enantioselectivities
Organocatalytic synthesis of spiro compounds via a cascade Michael–Michael-aldol reaction
No full textThe synthesis of spiro compounds via a Michael-Michael-aldol reaction is reported. The reaction affords spirooxindole derivatives in good yields and in almost diastereo- and enantiopure form. Moreover, the reaction works with several heterocycles such as oxindoles, benzofuranones, pyrazolones or azlactones rendering the final spiro compounds in good yields and excellent stereoselectivities
Feedstock Readiness Level (FSRL) evaluation: Zea mays (corn stover), Alcohol-to-Jet, Central East, Mar. 2017
No full textFeedstock readiness level evaluations are performed for a specific feedstock-conversion process combination and for a particular region. FSRL evaluations complement evaluations of Fuel Readiness Level (FRL) and environmental progress.
The data from this evaluation, compiled in March 2017, assesses the maturity of Zea mays (corn stover) as a feedstock for the Alcohol-to-Jet conversion process in the United States Central East region. Resources in this dataset:Resource Title: Zea mays_stover_CE_Mitchell Update.xlsx. File Name: Zea mays_stover_CE_Mitchell Update.xlsxResource Description: Feedstock Readiness Level evaluation for Zea mays (corn) stover in the Central East of the U.S.Resource Title: FSRL Data Dictionary. File Name: Data DictionaryF2F2_0_2 (1).csvResource Description: Data dictionary describing the format and entry of data for Feedstock Readiness Level evaluations.Resource Title: Zea mays_stover_ATJ_CE_Mitchell Update_2. File Name: Zea mays_stover_ATJ_CE_Mitchell Update_2.xlsxResource Description: Feedstock Readiness Level evaluation of Zea mays (corn stover) for cellulosic alcohol-to-jet conversion in the Central East region. This update reflects new information from the author as of Q2 2017.</p
“Educación ambiental para agricultores del cultivo de maíz (Zea mays) en el manejo de los residuos peligrosos de la zona norte de la Provincia de Los Ríos”
No full textThe present investigation project entitled "Environmental education for farmers of corn (Zea mays) in the management of hazardous waste in the northern zone of the Province of Los Ríos", searches to support with the correct management of hazardous waste generated by the use of agrochemicals, through integral
Key words: environmental education; hazardous waste, corn, farmers.El presente proyecto de investigación titulado “Educación ambiental para los agricultores del cultivo de maíz (Zea mays) en el manejo de los residuos peligrosos de la zona norte de la Provincia de Los Ríos”, busca apoyar el correcto manejo de los residuos peligrosos generados por el uso de agroquímicos, mediante gestión integral, actitudes, comportamientos en conjunto con un desarrollo sostenible.
Palabras Claves: Educación Ambiental; Residuos Peligrosos, maíz, agricultores
De novo assembly of Zea nicaraguensis root transcriptome identified 5261 full-length transcripts
No full textZea nicaraguensis, a wild relative of cultivated maize (Zea mays subsp. mays), is considered to be a valuable germplasm to improve the waterlogging tolerance of cultivated maize. Use of reverse genetic-based gene cloning and function verification to discover waterlogging tolerance genes in Z. nicaraguensis is currently impractical, because little gene sequence information for Z. nicaraguensis is available in public databases. In this study, Z. nicaraguensis seedlings were subjected to simulated waterlogging stress and total RNAs were isolated from roots stressed and non-stressed controls. In total, 80 mol L-1 Illumina 100-bp paired-end reads were generated. De novo assembly of the reads generated 81002 final non-redundant contigs, from which 5 261 full-length transcripts were identified. Among these full-length transcripts, 3 169 had at least one Gene Ontology (GO) annotation, 2354 received cluster of orthologous groups (COG) terms, and 1 992 were assigned a Kyoto encyclopedia of genes and genomes (KEGG) Orthology number. These sequence data represent a valuable resource for identification of Z. nicaraguensis genes involved in waterlogging response
Zea Books Policies and Procedures
No full textAbout
Zea Books is the digital imprint of the University of Nebraska–Lincoln Libraries. Its mission is to publish academic works (books, journals, multimedia) by scholars who are either affiliated with the University of Nebraska–Lincoln or are working in research areas of significant interest at UNL.
Zea Books was founded in 2008. It is a natural outgrowth of the successful UNL DigitalCommons institutional repository (http://digitalcommons.unl.edu/), an enterprise that has been publishing electronic books since its inception in 2005. The imprint helps foster the University of Nebraska–Lincoln\u27s commitment to the future of scholarly communications.
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Zea Books provides an innovative way for faculty to promote and disseminate their scholarly research.
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Sample Titles
Historical Common Names of Great Plains Plants, with Scientific Names Index. Volume I: Common Names and Volume II: Scientific Names Index (2015) by Elaine Nowick
Hopi Nation: Essays on Indigenous Art, Culture, History, and Law (2008) by Edna Glenn, John R. Wunder, Willard Hughes Rollings, and C. L. Martin
Loris Malaguzzi and the Teachers: Dialogues on Collaboration and Conflict among Children, Reggio Emilia 1990 (2015) by Carolyn Edwards, Lella Gandini, and John Nimmo
Media Revolution: Early Prints from the Sheldon Museum of Art (2012) by Gregory Nosan and Alison G. Stewart
Musica mechanica organoedi • Musical Mechanics for the Organist (2011) by Jacob Adlung, Johann Lorenz Albrecht, Johann Friedrich Agricola, and Quentin Faulkner
Resilient Russian Women in the 1920s & 1930s (2015) by Marcelline Hutton
Textile Terminologies from the Orient to the Mediterranean and Europe, 1000 BC to 1000 AD (2017) by Salvatore Gaspa, Cécile Michel, and Marie-Louise Nosch
Wetland Birds of the Central Plains: South Dakota, Nebraska and Kansas (2012) by Paul Johnsgar
Aislamiento e identificación de cepas de Azospirillum sp. y evaluación de su capacidad para suplir las necesidades de nitrógeno en el cultivo de maíz (Zea mays) semihidroponico con dos sustratos diferentes bajo invernadero. Quito, Cayambe, Ecuador 2011.
No full textThe corn, (Zea mays) L. is a basic crop in ecuadorian agriculture, which is why the search for environmentally friendly nitrogen fertilization of low cost doesn’t cease to be important. One of these options is the use of bio-fertilizers, for which the nitrogen fixing bacteria Azospirillum sp. can be used.
The objective of this work is to isolate and identify Azospirillum sp. stumps, and evaluate its capacity to provide the nitrogen’s needs in the semi-hydroponic crop, , (Zea mays) L. within the green house.
The samples were collected in some places and were isolated started at the (Zea mays) L. corn root, using a semisolid free from nitrogen (NfB) for Azospirillum sp., and were then identified through morphological and biochemical studies.El maíz, (Zea mays) L. es un cultivo básico en la agricultura ecuatoriana, por lo que la búsqueda de opciones de fertilización nitrogenada de bajo costo y amigables con el ambiente no deja de ser importante. Una de estas opciones es el uso de biofertilizantes, para los cuales se puede utilizar la bacteria fijadora de nitrógeno Azospirillum sp.
El objetivo de este trabajo fue el de aislar e identificar cepas de Azospirillum sp., y evaluar su capacidad para suplir las necesidades de nitrógeno en un cultivo semihidropónico de maíz, (Zea mays) L. bajo invernadero
Las muestras se colectaron en algunos sitios y se aislaron a partir de raíces de maíz, (Zea mays) L., utilizando para ello un medio semisólido libre de nitrógeno (NfB) para Azospirillum sp., y luego se identificaron mediante estudios morfológicos y bioquímicos
Highly stereoselective synthesis of spiropyrazolones
No full textThe synthesis of spiro compounds through a Michael-Michael-aldol reaction is reported. The reaction affords spiropyrazolone derivatives in good yields, in almost diastereo- and enantiopure form, and is catalyzed by diphenylprolinol derivatives. The reaction showed strong nonlinear effects. Remarkably, when a catalyst with 70% ee is used, the reaction still affords the final spiro compound in almost diastereo- and enantiopure form
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