Active center determination of ethylene polymerisation catalysts using a quenching method with tritiated methanol

The subject of this work is ethylene polymerisation using Kaminsky type catalysts: Cp2MR2=methylaluminoxane [M=Zr,W,Nb; R=Cl,CH3]. Active center determination and kinetic studies of the (Cp2WCl2 + methylaluminoxane) and Cp2ZrCl2 + methylaluminoxane) systems are described, using a quenching method with tritiated methanol. The activity of the polymer was determined by liquid scintillation counting. We have found 0.5% and 87% of active centers, respectively for W and Zr system. The catalytic activity of complexes Cp2WCl2 and Cp2NbCl2 was compared with that of Cp2ZrCl2. The W and Nb complexes are found to be less active than the Zr complex.info:eu-repo/semantics/publishedVersio

Infection By The Human Papillomavirus In Teenagers Sexually Active: Clinic And Subclinic Manifestations.

This research studies the association of the cervical condyloma with the intraepithelial neoplasia, during sex activity, pregnancy, diagnose methods, cytology and colposcopy in teenagers. The objective of this research is to study the propaedeutics for the uterine coli condyloma diagnose in a group of teenagers. For this purpose, we have studied 131 teenagers sexually active with ages between 14 and 19 years and presenting histologically confirmed uterine coli condyloma. Association with intraepithelial neoplasia, sexual activity duration, method of diagnose, pregnancy analysis, cytology and colposcopy results and association with vulva and vagina injuries were evaluated. The high association rate with condyloma and intraepithelial neoplasia after a short time of sexual activity and the none presence of macroscopic warts in the genital organs in 80% of cases presenting cervical condyloma, demonstrate that: a more careful investigation with colposcopy and biopsy of the inferior genitals of the women-teenagers sexually active is needed, when presenting modified cervical cytology.113494895

Characterization of all the supersymmetric solutions of gauged N=1,d=5 supergravity

We find a complete characterization of all the supersymmetric solutions of non-Abelian gauged N=1,d=5 supergravity coupled to vector multiplets and hypermultiplets: the generic forms of the metrics as functions of the scalars and vector fields plus the equations that all these must satisfy. These equations are now a complicated non-linear system and there it seems impossible to produce an algorithm to construct systematically all supersymmetric solutions.Comment: Some references and two comments adde

A new dihydroxysterol from the marine phytoplankton Diacronema sp.

Diacronema sp. was cultured and its sterols were separated by column chromatography on silica gel. The new sterol 24-ethyl-4α-methyl-cholestane-3,20-diol (1) was characterised by NMR and MS spectrometry, as well as (22E)-24-ethyl-4α-methyl-5α-cholest-22-en-3β-ol (2) and β-sitosterol, the major components of the sterol fractions. Neither the biosynthetic origin of the new dihydroxysterol nor its role in the biochemistry of Diacronema is known.info:eu-repo/semantics/publishedVersio

A novel pentacyclic triterpene from Leontodon filii

A novel oleanene triterpenetetrol was isolated from the chloroform extract of the aerial parts of Leontodon filii. Its structure was shown to be 2β,3β,15α,21β-olean-12-ene-2,3,15,21-tetrol by chemical and spectroscopic methods. The fungicidal efficacy of the chloroform and methanol extracts of the plant was also evaluated, a protective effect being found against Plasmopara viticola, Botrytis cinerea, particularly powerful against Pyricularia oryzae.info:eu-repo/semantics/publishedVersio

All the supersymmetric solutions of N=1,d=5 ungauged supergravity

We classify the supersymmetric solutions of ungauged N=1 d=5 SUGRA coupled to vector multiplets and hypermultiplets. All the solutions can be seen as deformations of solutions with frozen hyperscalars. We show explicitly how the 5-dimensional Reissner-Nordstrom black hole is deformed when hyperscalars are living on SO(4,1)/SO(4) are turned on, reducing its supersymmetry from 1/2 to 1/8. We also describe in the timelike and null cases the solutions that have one extra isometry and can be reduced to N=2,d=4 solutions. Our formulae allows the uplifting of certain N=2,d=4 black holes to N=1,d=5 black holes on KK monopoles or to pp-waves propagating along black strings.Comment: Some typos fixed and some paragraphs improved. 44 pages, Latex 2e file, no figures. Version to be published in JHE

The relationship between fatty acids and fish: lesser-known aspects and the need for increasingly efficient analytical techniques

When we associate the word fatty acids with fish, most people identify fish as sources of fatty acids from the omega families. This relationship is always present in the valuation of nutritional quality of fish. However, fatty acids have many other crucial functions in fish. The oldest studies related to fatty acids focused essentially on their role as sources metabolic energy in the form of ATP through β-oxidation. Many studies referred the fatty acid role for migrations, energy production during growth and egg formation, among others. Soon fatty acids quickly began to be studied from the point of view of source of essential nutrients for several physiological processes and integral components of biological membranes. The high content of highly polyunsaturated fatty acids found in fish is related to the fact that they are poikilothermic. In the presence of various temperature scenarios, fish can effectively exploit a wide chemical diversity of membrane fatty acid profiles, to defend their physical properties, such as fluidity. In the last decades, fatty acids have been used as either biomarkers because they are limited to certain taxa and they can be transferred conservatively from primary producers to higher trophic level or stock identifiers because the fatty acid composition of phospholipids in some body tissues have a stable genetics basis. In the last decades multiple techniques have been used for fatty acid analysis. As a rule, before the instrumental analysis, the sample requires 2 previous steps. These comprise extraction of lipids from the matrix and derivatization. The combination of these two stages generates multiple methodologies that are not always standardized. Soon, the analysis of fatty acids tends to reduce and standardize these previous analyses while the instrumental analysis should solve problems related to similar mass spectra of the isomers and coelution between fatty acidsFundação para a Ciência e Tecnologia (FCT) for a PhD scholarship UI/BD/153381/2022.This work was funding by National Funds through FCT - Foundation for Science and Technology under the Project PTDC/BIA-BMA/030517/2017 and the Portuguese Science Foundation through the strategy plan for MED (Mediterranean Institute for Agriculture, Environment and Development), via project UIDB/05183/2020, for MARE (Marine and Environmental Sciences Centre), via project UIDB/04292/2020, UID/50006/2020, and under the project LA/P/0069/2020 granted to the Associate Laboratory ARNET; and for LAQV-REQUIMTE, via project UIDB/50006/2020 and UIDP/50006/202

Traffic jam driving with NMV avoidance

In recent years, the development of advanced driver assistance systems (ADAS) - mainly based on lidar and cameras - has considerably improved the safety of driving in urban environments. These systems provide warning signals for the driver in the case that any unexpected traffic circumstance is detected. The next step is to develop systems capable not only of warning the driver but also of taking over control of the car to avoid a potential collision. In the present communication, a system capable of autonomously avoiding collisions in traffic jam situations is presented. First, a perception system was developed for urban situations - in which not only vehicles have to be considered, but also pedestrians and other non-motor-vehicles (NMV). It comprises a differential global positioning system (DGPS) and wireless communication for vehicle detection, and an ultrasound sensor for NMV detection. Then, the vehicles actuators - brake and throttle pedals - were modified to permit autonomous control. Finally, a fuzzy logic controller was implemented capable of analyzing the information provided by the perception system and of sending control commands to the vehicles actuators so as to avoid accidents. The feasibility of the integrated system was tested by mounting it in a commercial vehicle, with the results being encouraging. © 2012 Elsevier Ltd. All rights reserved. Peer Reviewed Document type: Articl

A flexible strain-responsive sensor fabricated from a biocompatible electronic ink via an additive-manufacturing process

Biosensor technologies are of great interest for applications in wearable electronics, soft robotics and implantable biomedical devices. To accelerate the adoption of electronics for chronic recording of physiological parameters in health and disease, there is a demand for biocompatible, conductive & flexible materials that can integrate with various tissues while remaining biologically inert. Conventional techniques used to fabricate biosensors, such as mask lithography and laser cutting, lack the versatility to produce easily customisable, micro-fabricated biosensors in an efficient, cost-effective manner. In this paper, we describe the development and characterisation of an electronic ink made from an environmentally sustainable copolymer - x-pentadecalactone-co-e-decalactone, (PDL) incorporating silver nanowires (AgNW), which are known for their antimicrobial and conductive properties. The composites were shown to possess a low percolation threshold (1% w/w of AgNW to PDL), achieve a low electrical resistance (320 +/- 9 O/sq) and a high electrical capacitance (2.06 +/- 0.06 mF/cm2). PDL nanocomposites were biocompatible, demonstrated in vitro through the promotion of neural adhesion and prevention of astrocyte activation. An optimised ink formulation was subsequently used to fabricate strain-responsive biosensors with high spatial resolution (sub-100 mm) using a direct write additive manufacturing process. Using a customized in vitro set-up, the sensitivity of these biosensors to biologically-relevant strains was assessed under simulated physiological conditions for 21 days. Critically, these 3D printed biosensors have applications in chronic prophylactic monitoring of pressure changes within the body and related pathologies.This publication has emanated from research conducted with the financial support of the Science Foundation Ireland (SFI) Technology Innovation Development Programme, grant no. 15/TIDA/2992 and was co-funded under the European Regional Development Fund under Grant Number 13/RC/2073 and the Hardiman PhD Research Scholarship from the National University of Ireland, Galway. This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 713690. The authors acknowledge the facilities and scientific and technical assistance of the Centre for Microscopy & Imaging at the National University of Ireland Galway, a facility that is funded by NUIG and the Irish Government's Programme for Research in Third Level Institutions, Cycles 4 and 5, National Development Plan 20072013.r The Basque Government GV/EJ (Department of Education, Linguistic Politics and Culture) is also acknowledged for financial support to the consolidated research groups project IT927-16 (UPV/EHU, GIC/152)

El nabo como recurso forrajero invernal en la producción de carne

El objetivo del trabajo fue evaluar la producción de carne con nabo forrajero (Brassica napus x B. oleracea cv Interval) en cultivo puro y en mezcla con avena bajo pastoreo con novillitos a fines del invierno. El experimento se realizó en la EEA INTA Pergamino durante el año 2011. Se utilizó un diseño experimental en bloques completos al azar con dos repeticiones. Los tratamientos fueron: 1) nabo puro (Nf) y 2) nabo asociado con avena (Nf+A) en líneas alternadas. Se evaluaron tres períodos (del 16/8 al 6/9, del 6/9 al 4/10 y del 4/10 al 21/10). Los resultados se analizaron mediante ANVA (p<0,05) con el programa Infostat. Se analizaron estadísticamente los períodos 1 y 3. En el período 2 los animales permanecieron solo en Nf+A. Se midió la cantidad de forraje a la entrada y a la salida de cada pastoreo y el peso vivo (PV) animal al inicio y al final en cada período. Se tomaron muestras de Nf para análisis del valor nutritivo al inicio y al final del experimento (PB, FDN y DIVMS). La carga animal (CA) fue variable con 4 animales “fijos” por tratamiento (raza Aberdeen Angus; PV inicial: 296 ± 26 kg) y animales volantes para alcanzar una asignación diaria de forraje con un mínimo de 5% del PV. Las lluvias en el período experimental fueron 38% menores y el número de heladas fueron 23% superiores al promedio histórico (1910-2011). El valor nutritivo promedio del Nf fue de: 18,6% de PB, 23,9% de FDN y 89,2% de DIVMS. En el período 1 la disponibilidad de forraje de entrada (2.590 kg de materia seca (MS).ha-1), el forraje remanente de salida (1.716 kg MS.ha-1), la ganancia diaria de peso vivo (GDPV, 1,3 kg animal-1.día-1), la CA (6,4 animales.ha-1) y la producción de carne (168 kg.ha-1) fueron similares entre tratamientos. En el período 3, la disponibilidad promedio de entrada (1.175 kg MS.ha-1) y de salida (538 kg MS.ha-1), la GDPV (1,1 kganimal-1.día-1) y la producción de carne (89 kg.ha-1) fueron similares entre los tratamientos. La CA tendió a ser mayor (p=0,06, EEM: 0,37) en Nf (6,1 animales.ha-1) en relación con Nf+A (4,0 animales.ha-1). En los períodos analizados (1 y 3 en el tratamiento Nf y 1, 2 y 3 para Nf+A) la CA fue mayor (P<0,01; EEM: 0,07) en el Nf cuanto estuvo bajo pastoreo (6,7 animales.ha-1) que en Nf+A (4,5 animales.ha-1) y hubo una tendencia (P=0,09; EEM: 28,3) a una mayor producción de carne en Nf+A que en Nf (403 frente a 288 kg.ha-1, respectivamente), dado que Nf+A permitió mantener los animales durante todo el ensayo. La mezcla de nabo forrajero más avena fue una mejor alternativa que el nabo forrajero puro para cubrir el déficit de forraje a la salida del invierno, porque permitió mantener los animales bajo pastoreo todo el ciclo y tuvo una tendencia de mayor producción de carne. El nabo forrajero puro, sin embargo, permitió tener mayor carga animal en los períodos de clima más favorable.The objective of this study was to evaluate the beef production with forage brassica (Brassica napus x B. oleracea cv Interval) in pure culture and in mix with oats with steers grazing in late winter. The experiment was carried out at the Pergamino Experimental Station of the National Institute of Agricultural Technology, Buenos Aires, Argentina during 2011. The treatments were: 1) pure brassica (Nf) and 2) brassica associated with oats (Nf+A) on alternating lines. Treatments were arranged in a randomized complete blocks experimental design with two replications. Three grazing periods were evaluated (Period 1: from August 16th to September 6 th, Period 2 from September 6 th to October 4 th and Period 3 from October 4 th to October 21 th). Results were analyzed using ANOVA (p < 0.05), with the Infostat software. In the Period 2 animals remained only in Nf+A, so only the Periods 1 and 3 were statistically analyzed. Pre and post – grazing forage masses were measured whereas liveweight was taken at the beginning and at the end in each period. At the beginning and at the end of the experiment Nf samples for nutritive value (CP, NDF and DMDIV) were taken. In order to achieve a similar forage utilization between treatments, a put and take management was used with 4 fixed animals per treatment (Aberdeen Angus breed; initial liveweight (LW): 296 ± 26 kg) and 5% of LW of daily forage on offer. The rainfall during experimental period was 38% lower and the numbers of frosts were 23% higher than the historical average (1910-2011). The nutritive value average of Nf was: 18.6% of CP, 23.9% of NDF and 89.2% of IVDMD. In the Period 1, pre and post – grazing forage masses (2590 kg and 1716 kg DM.ha-1, respectively), daily LW gain (1.3 kg.animal-1.day-1), stocking rate (SR, 6.4 animals.ha-1) and beef production (168 kg.ha-1) were the same in both treatments. In the Period 3, pre and post – grazing forage masses (1175 kg and 538 kg DM.ha-1, respectively), daily LW gain (1.1kg.animal-1.day-1) and beef production (89.1 kg.ha-1) were the same in both treatments. The SR showed a tendency to be greater (p = 0.06, SEM: 0.37) in Nf (6.1 animals.ha-1) in relation to the Nf+A (4.0 animals.ha-1). In the analysis of the results of the 3 periods all together (Periods 1 and 3 in the Nf treatment and Periods 1, 2 and 3 for Nf+A) SR was higher (p< 0.01; SEM: 0.07) in the Nf (6.7 animals.ha-1) than Nf+A (4.5 animals.ha-1) and there was a trend (p = 0.09; SEM: 28.3) to a greater beef production in Nf+A than in Nf (403 and 288 kg.ha-1, respectively), because Nf+A allowed to hold animals during all the experimental period. The results show that brassica associated with oats was a best alternative to cover the deficit of forage to the late winter, because allowed support the animals throughout the cycle and increased beef production. Pure brassica, however, allowed to hold higher stocking rate in periods the better climate.EEA PergaminoFil: Bertin, Oscar Dario. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Pergamino; ArgentinaFil: Camarasa, Jonatan Nicolás. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Pergamino; ArgentinaFil: Scheneiter, Jorge Omar. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Pergamino; Argentin