scholarly journals Absence of a molecular structural effect on the thermodynamic properties of several biodiesel materials

2018 ◽  
Vol 10 (2) ◽  
pp. 362-367 ◽  
Author(s):  
Hermes R. Alvarado-Montero ◽  
Carmen Monge-Montero ◽  
María Sol Vargas ◽  
Giselle Lutz ◽  
Julio F. Mata-Segreda

In the search to develop the production of vegetable oils for non-food purposes biodiesel stands out for its great versatility as technical material and a cleaner energy technology. Physic nut (Jatropha curcas), castor-oil (Ricinus communis), oil palm (Elaeis guineensis), wine palm (Attalea butyracea) and macaw palm (Acrocomia aculeata) were chosen for study in our laboratory, because they are oleaginous plants with convenient oil yields to produce biodiesel. No significant effect from the nature of fatty-acid chains in biodiesel is observed on thermodynamic properties such as heat of combustion, cubic-expansion thermal coefficient, isothermal compressibility, enthalpy of vaporisation and Hildebrand solubility parameter. Activation energies for viscous flow of biodiesels correlates with the same property of their vegetable oil feedstocks.

2021 ◽  
Author(s):  
Braulio Fernandes de Carvalho ◽  
Gustavo Nogueira Barreto

Introdução: Murici dos Portelas, no estado do Piauí, encontra-se na Mata dos Cocais, área de transição entre Cerrado, Caatinga e Amazônia, bioma rico em espécies vegetais produtoras de óleos, incluindo a maior concentração de palmeiras (Aracaceae) oleaginosas do mundo. O plantio de espécies nativas para a produção de óleos poderia enriquecer interações ecológicas locais, por fornecer alimentos para a fauna, bem como gerar atividades econômicas sustentáveis, associadas a outros serviços e produtos, fornecendo alternativas à destruição de habitats tropicais relacionada ao monocultivo de Palma (Elaeis guineensis). Objetivos: Propor projeto de plantio com espécies botânicas produtoras de óleos, associado a uma cadeia produtiva local, com foco na obtenção de óleos vegetais e desenvolvimento de produtos com valor agregado. Material e métodos: Fez-se estudo bibliográfico para identificar vegetação arbustiva e arbórea com potencial de estabelecimento em propriedade rural, que também serviria como base de cadeia produtiva, no município de Murici dos Portelas-PI. Levou-se em consideração que parte da propriedade rural, localizada em 3°15’46.96’’S, 41°57’04.25’’O) será destinada a criação de Reserva Particular do Patrimônio Natural, onde somente é permitido ecoturismo, pesquisa científica e educação ambiental, e o restante da área terá uso direto dos recursos naturais. Resultados: As plantas produtoras de óleos com potencial para estabelecimento no local foram Andiroba (Capara sp.), Babaçu (Orbignya martiana), Baru (Dipteryx alata), Carnaúba (Copernicia prunifera), Coco-babão (Syagrus cearensis), Copaíba (Copaifera sp.), Licuri (Syagrus coronata), Macaúba (Acrocomia aculeata), Mamona (Ricinus communis), Oiticica (Licania rigida), Pindoba (Attalea sp.), Sucupira (Bowdichia sp.) e Tucunzeiro (Bactris setosa). Conclusão: São várias as espécies vegetais adequadas ao projeto. Entretanto, a capacidade de produção de cada óleo, propriedades químicas e valor comercial varia de acordo com a espécie e as condições ambientais locais. As aplicações desses óleos incluem produção de cosméticos, alimentos, medicamentos, fitoterápicos, produtos de limpeza, lubrificantes e biocombustíveis. Evidencia-se que muitas dessas espécies não são domesticadas e fazem-se necessárias mais pesquisas para o entendimento da biologia e melhoramento genético dessas culturas.


PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e6354 ◽  
Author(s):  
Zhi Zou ◽  
Xicai Zhang

DNA-binding with one finger (Dof) proteins comprise a plant-specific transcription factor family involved in plant growth, development and stress responses. This study presents a genome-wide comparison of Dof family genes in physic nut (Jatropha curcas) and castor bean (Ricinus communis), two Euphorbiaceae plants that have not experienced any recent whole-genome duplication. A total of 25 or 24 Dof genes were identified from physic nut and castor genomes, respectively, where JcDof genes are distributed across nine out of 11 chromosomes. Phylogenetic analysis assigned these genes into nine groups representing four subfamilies, and 24 orthologous groups were also proposed based on comparison of physic nut, castor, Arabidopsis and rice Dofs. Conserved microsynteny was observed between physic nut and castor Dof-coding scaffolds, which allowed anchoring of 23 RcDof genes to nine physic nut chromosomes. In contrast to how no recent duplicate was present in castor, two tandem duplications and one gene loss were found in the Dof gene family of physic nut. Global transcriptome profiling revealed diverse patterns of Jc/RcDof genes over various tissues, and key Dof genes involved in flower development and stress response were also identified in physic nut. These findings provide valuable information for further studies of Dof genes in physic nut and castor.


2010 ◽  
Vol 289 (2) ◽  
pp. 179-191 ◽  
Author(s):  
Marcos D. Fernández-Leyes ◽  
Paula V. Messina ◽  
Pablo C. Schulz

1979 ◽  
Vol 44 ◽  
pp. 349-355
Author(s):  
R.W. Milkey

The focus of discussion in Working Group 3 was on the Thermodynamic Properties as determined spectroscopically, including the observational techniques and the theoretical modeling of physical processes responsible for the emission spectrum. Recent advances in observational techniques and theoretical concepts make this discussion particularly timely. It is wise to remember that the determination of thermodynamic parameters is not an end in itself and that these are interesting chiefly for what they can tell us about the energetics and mass transport in prominences.


Author(s):  
D.C. Hixson ◽  
J.C. Chan ◽  
J.M. Bowen ◽  
E.F. Walborg

Several years ago Karasaki (1) reported the production of type C virus particles by Novikoff ascites hepatocarcinoma cells. More recently, Weinstein (2) has reported the presence of type C virus particles in cell cultures derived from transplantable and primary hepatocellular carcinomas. To date, the biological function of these virus and their significance in chemically induced hepatocarcinogenesis are unknown. The present studies were initiated to determine a possible role for type C virus particles in chemically induced hepatocarcinogenesis. This communication describes results of studies on the biological and surface properties of type C virus associated with Novikoff hepatocarcinoma cells.Ecotropic and xenotropic murine leukemia virus (MuLV) activity in ascitic fluid of Novikoff tumor-bearing rats was assayed in murine sarcoma virus transformed S+L- mouse cells and S+L- mink cells, respectively. The presence of sarcoma virus activity was assayed in non-virus-producing normal rat kidney (NRK) cells. Ferritin conjugates of concanavalin A (Fer-Con wheat germ agglutinin (Fer-WGA), and Ricinus communis agglutinins I and II (Fer-RCAI and Fer-RCAII) were used to probe the structure and topography of saccharide determinants present on the viral envelope.


Author(s):  
Robert E. Nordquist ◽  
J. Hill Anglin ◽  
Michael P. Lerner

A human breast carcinoma cell line (BOT-2) was derived from an infiltrating duct carcinoma (1). These cells were shown to have antigens that selectively bound antibodies from breast cancer patient sera (2). Furthermore, these tumor specific antigens could be removed from the living cells by low frequency sonication and have been partially characterized (3). These proteins have been shown to be around 100,000 MW and contain approximately 6% hexose and hexosamines. However, only the hexosamines appear to be available for lectin binding. This study was designed to use Concanavalin A (Con A) and Ricinus Communis (Ricin) agglutinin for the topagraphical localization of D-mannopyranosyl or glucopyranosyl and D-galactopyranosyl or DN- acetyl glactopyranosyl configurations on BOT-2 cell surfaces.


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