6,223 research outputs found
Transcriptional regulation of bidirectional gene pairs by 17-β-estradiol in MCF-7 breast cancer cells
Using cDNA microarray analysis, we previously identified a set of differentially expressed genes in primary breast tumors based on the status of estrogen and progesterone receptors. In the present study, we performed an integrated computer-assisted and manual search of potential estrogen response element (ERE) binding sites in the promoter region of these genes to characterize their potential to be regulated by estrogen receptors (ER). Publicly available databases were used to annotate the position of these genes in the genome and to extract a 5’flanking region 2 kb upstream to 2 kb downstream of the transcription start site for transcription binding site analysis. The search for EREs and other binding sites was performed using several publicly available programs. Overall, approximately 40% of the genes analyzed were potentially able to be regulated by estrogen via ER. In addition, 17% of these genes are located very close to other genes organized in a head-to-head orientation with less than 1.0 kb between their transcript units, sharing a bidirectional promoter, and could be classified as bidirectional gene pairs. Using quantitative real-time PCR, we further investigated the effects of 17β-estradiol and antiestrogens on the expression of the bidirectional gene pairs in MCF-7 breast cancer cells. Our results showed that some of these gene pairs, such as TXNDC9/EIF5B, GALNS/TRAPPC2L, and SERINC1/PKIB, are modulated by 17β-estradiol via ER in MCF-7 breast cancer cells. Here, we also characterize the promoter region of potential ER-regulated genes and provide new information on the transcriptional regulation of bidirectional gene pairs
Modeling of asphaltene precipitation from n-alkane diluted heavy oils and bitumens using the PC-SAFT equation of state
In this work, the PC-SAFT equation of state was applied to the modeling of asphaltene precipitation from n-alkane diluted heavy oils and bitumens. Liquid-liquid equilibrium was assumed between a dense liquid phase (asphaltene-rich phase) and a light liquid phase. The liquid-liquid equilibrium calculation, in which only asphaltenes were allowed to partition to the dense phase, was performed using an efficient method with Michelsen’s stability test. The bisection or Newton-Raphson method was used to improve convergence. Experimental information of the heavy oils and bitumens, characterized in terms of solubility fractions (saturates, aromatics, resins, and asphaltenes), was taken from the literature. Asphaltenes were divided into fractions of different molar masses using a gamma distribution function. Predictions of the PC-SAFT equation of state using linear correlations of the binary interaction parameters between asphaltene subfractions and the n-alkane were compared with the measured onset of precipitation and the amount of precipitated asphaltene (fractional yield) of the heavy oils and bitumens diluted with n-alkanes. Results of the comparison showed a satisfactory agreement between the experimental data and the calculated values with the PC-SAFT equation
Characterizing Cautious Choice
The class of maximin actions in general decision problems is characterized.Maximin actions;Decision problems
Nigrosine staining of wheat endosperm proteolipid patterns on starch gels
We have previously characterized a group of proteolipids from wheat endosperm, designated CM proteins, which are soluble in chloroformmethanol (2:1, v/v) and have a molecular weight lower than 25,000 daltons (1-3). These have been also studied by Redman and Ewart (4). The CM proteins are suitably fractionated into several components by starch gel electrophoresis at pH 3.2 (1). A sensitive staining procedure was required in connection with genetic studies of these proteins because phenotypes had to be ascertained in small endosperm fractions dissected without impairing normal germination and plant development. We report here on Nigrosine staining conditions for CM proteins under which high sensitivity and selectivity are achieve
HYPERCYCLICITY OF TRANSLATION OPERATORS IN A REPRODUCING KERNEL HILBERT SPACE OF ENTIRE FUNCTIONS INDUCED BY AN ANALYTIC HILBERT-SPACE-VALUED KERNEL
The Rural Digital Divide in the Face of the COVID-19 Pandemic in Europe-Recommendations from a Scoping Review
The COVID-19 pandemic has revealed the digital vulnerability of many citizens of the rural world. This article identifies and analyzes the proposals made by academic literature to overcome the digital divide in the European rural world for the five-year period 2016-2020. A scoping review has been carried out according to the PRISMA methodology in the two dimensions of the digital divide: access and connectivity, and use and exploitation. Online databases were used to identify scientific articles from which, after screening, 28 key documents were selected. The results update Salemink systematic review of articles published between 1991 and 2014 on digital and rural development in Western countries and it also intends to go beyond by extracting recommendations. A variety of political, social, educational, technical and economic issues has been exposed, with a common emphasis on the empowerment of rural populations. The findings provide actionable evidence and proposals to facilitate decision-making in current policy information to overcome rural digital divide. From them, seven recommendations that could have a wide and rapid impact to minimize the effects of the COVID-19 pandemic linked to the rural digital divide are synthesized. Three lines of action in the medium term are also proposed: the evaluation of national and regional public policies; the consideration of digital inclusion as a potential instrument to reduce rural depopulation; and the training in advanced digital skills to improve the social communication processes, considered key to promote empowerment and entrepreneurship
Analytical Expressions for Radiative Opacities of Low Z Plasmas
In this work we obtain analytical expressions for the radiative opacity of several low Z plasmas (He, Li, Be, and B) in a wide range of temperatures and densities. These formulas are obtained by fitting the proposed expression to mean opacities data calculated by using the code ABAKO/ RAPCAL. This code computes the radiative properties of plasmas, both in LTE and NLTE conditions, under the detailed-level-accounting approach. It has been successfully validated in the range of interest in previous works
Effect Of Soil Management On The White Grub Population And Damage In Soybean
To evaluate the effect of soil management systems on population of white grubs, (Phyllophaga cuyabana Moser), and on its damage in soybean, experiments were set up under no-tillage and conventional tillage (one disk plow, and a leveling disk harrow) areas. Primary tillage equipment, used in other soil management systems, such as moldboard plow, disk plow, chisel plow and heavy duty disk harrow were also tested. Fluctuation of P. cuyabana population and the extent of its damage to soybean was similar under no-tillage and conventional tillage systems. Results comparing a range of primary tillage equipment showed that it affected soil insect populations differently, depending on the time during the season in which tillage was executed. Larval mortality could mostly be attributed to their exposure to adverse factors, soon after tillage, than to changes in soil conditions. Reduction of white grub population was more evident in plots managed by heavier equipment, such as the moldboard plow. Soil tillage could be one component within the soil pest management system in soybean, however, its use can not be generalized.355887894Alvarado, L., (1979) Comparación Poblacional de "Gusanos Blancos" (Larvas de Coléopteros Scarabaeidae) en Tres Situaciones de Manejo, 5p. , Pergamino : INTA/ EERA, (INTA/EERA. Genéralidades Carpeta de Producción Vegetal. Información, 16)Brown, W.R., Gange, A.C., Insect herbivore below ground (1990) Advances in Ecological Research, 20, pp. 1-58. , San DiegoGarcia, M.A., Arthropods in tropical corn field: Effects of woods and insecticides on community composition (1991) Plant-animal Interactions: Evolutionary Ecology in Tropical and Temperate Regions, pp. 619-634. , PRICE, P.LEWINSOHON, T.M.FERNANDES, W.BENSON, W.W. (Eds.). New York: J. WileyGassen, D.N., Corós associados ao sistema de plantio direto (1993) Plantio Direto no Brasil, pp. 141-149. , ALDEIA NORTE (Passo Fundo, RS) (Ed.). Passo Fundo : Embrapa-CNPT/Fundacep Fecotrigo/Fundação ABCHammond, R.B., Stinner, B.R., Seedcom maggots (Diptera: Anthomyiidae) and slugs in conservation tillage systems in Ohio (1987) Journal of Economic Entomology, 80, pp. 680-684. , LanhamHoffmann-Campo, C.B., Parra, J.R.P., Mazzarin, R.M., Ciclo biológico de Sternechus subsignatus Boheman, 1836 (Coleoptera: Curculionidae) em soja no norte do Paraná (1991) Revista Brasileira de Biologia, 51, pp. 615-621. , Rio de Janeiro(1976) Manual Agropecuário para O Paraná, 1. , LondrinaOliveira, L.J., (1997) Ecologla Comportamental e de Interações com Plantas Hospedeiras em Phyllophaga Cuyabana (Moser) (Coleoptera: Melolonthidae, Melolonthinae) e Implicações para o Seu Manejo em Cultura de Soja, 148p. , Campinas : Unicamp, Tese de DoutoradoOliveira, L.J., Hoffmann-Campo, C.B., Do Amaral, M.L.B., Nachi, C., (1992) Coró Pequeno da Soja, 4p. , Londrina : Embrapa-CNPSo. (Embrapa-CNPSo. Documentos, 51)Oliveira, L.J., Hoffmann-Campo, C.B., Sistemas de preparo de solo: Efeito sobre populações de larvas de escarabeídeos e Sternechus subsignatus (1996) Resultados de Pesqulsa de Soja 1990/91, pp. 464-468. , EMBRAPA. Centro National de Pesquisa de Soja (Londrina, PR). Londrina, (Embrapa-CNPSo. Documentos, 99)Rincón, M.B.N., Tiscareño, M., Velásquez, M., Diversidad y abundancia de Melolonthidae y Scarabaeidae (Insecta: Coleoptera) asociados a diferentes sistemas de labranza y porcentajes de cobertura vegetal en agrosistemas de maíz del Estado de Michoacan, México (1997) Reunión Latino-americana de Escara-beidologia, 3, pp. 18-19. , Xalapa. Memórias. Xalapa: Institute de Ecologia, 1997Shelton, M.D., Edwards, C.R., Effects of weeds on the diversity and abundance of insects on soybeans (1983) Environmental Entomology, 12, pp. 296-298. , LanhamDa Silva, M.T.B., Grutzmacher, A.D., Ruedell, J., Link, D., Costa, E.C., Influência de sistemas de manejo de suelos y de culturas sobre insectos sub́terraneos (1994) Clência Rural, 24, pp. 247-251. , Santa MariaDa Silva, M.T.B., Klein, V.A., Efeito de diferentes métodos de preparo do solo na infestação e danos de Sternechus subsignatus (Boheman) em soja (1997) Ciência Rural, 27, pp. 533-536. , Santa MariaDa Silva, M.T.B., Klein, V.A., Link, D., Reinert, D.J., Influência de sistemas de manejo de solos na oviposição de Diloboderus abderus Sturm (Coleoptera: Melolonthidae) (1994) Anais da Sociedade Entomológica Brasileira, 3, pp. 543-548. , LondrinaSloderbeck, P.E., Yeargen, K.V., Green cloverworm (Lepidoptera: Noctuidae) populations in conventional and double-cropped, no-till soybeans (1983) Journal of Economic Entomology, 76, pp. 785-791. , LanhamSmith, A.W., Hammond, R.B., Stinner, B.R., Influence of rye-cover crop management on soybean foliage arthropods (1988) Environmental Entomology, 17, pp. 109-114. , LanhamStinner, B.R., House, G.J., Arthropods and other invertebrates in conservation-tillage agriculture (1990) Annual Review of Entomology, 35, pp. 299-318. , Palo AltoStrnad, S.P., Bergman, M.K., Movement of first-instar western corn rootworms (Coleoptera: Chrysomelidae) in soil (1987) Environmental Entomology, 16, pp. 975-978. , LanhamToxclair Jr., N.N., Boethel, D.J., The influence of tillage practices and row spacing on soybean insect populations in Louisiana (1984) Journal of Economic Entomology, 77, pp. 1571-1579. , LanhamWinter, J.P., Voroney, R.P., Ainsworth, D.A., Soil microarthropods in long-term no-tillage and conventional tillage corn production (1990) Canadian Journal of Soil Science, 70, pp. 641-653. , Ottaw
Heterogeneity of wheat endosperm proteolipids (CM proteins)
Proteins extracted with CHCl3-MeOH from wheat endosperm have been fractionated by Sephadex G-100 and the 15 000–20 000 MW range fraction, designated CM protein, has been examined by combined electrofocusing (pH range 5–8) and electrophoresis (pH 3.2) and the heterogeneity of the electrophoretic components has been ascertained. It has been shown by joint mapping and by sequential extraction that CM proteins are extracted by 70% EtOH but not by H2O, although they can be made water-soluble after dialysis against an acid buffer, pH 3.2, 3 M urea, without losing their solubility in CHCl3-MeOH mixtures. It is concluded that CM proteins fit the definition of a Folch—Lees proteolipid. The Triticum aestivum (genomes ABD) map can be reconstructed by mixing T. durum (AB) and Aegilops squarrosa (D). The low intragenomic variability of CM protein is confirmed
- …