187,950 research outputs found
Afroedura haackei Jacobsen, Kuhn, Jackman & Bauer, 2014, stat. nov.
No full text<i>A. haackei</i> stat. nov. Onderstall, 1984 <p>(Fig. 5 A)</p> <p> <b>Distribution.</b> Granite outcrops of the southern Lowveld of Mpumalanga province, South Africa (Bauer 2014h) (Figs. 4, 6). TM 49920 from Farm Scrutton 23MT (2230AD) (illustrated by Pienaar 1978 as <i>A. transvaalica</i>) appears similar or identical to <i>A. haackei</i> (Onderstall 1984, Jacobsen 1990) and may represent a translocation.</p> <p> <b>Remarks.</b> This species was described as a subspecies of <i>A. pondolia</i> (Onderstall 1984), but was amended by Jacobsen (1990) to <i>A. multiporis haackei</i>. Our molecular data confirm the relationship of the two taxa, but based on substantial genetic differentiation (Fig. 1) as well as differences in body size and precloacal pore counts (see Table 4), and their allopatric distribution, we here formally elevate <i>A. haackei</i> to specific rank. The species was previously listed in the <i>South African Red Data Book</i> as “Restricted” (Jacobsen 1988a) but is currently considered to be of Least Concern (Bauer 2014h).</p>Published as part of <i>Jacobsen, Niels H. G., Kuhn, Arianna L., Jackman, Todd R. & Bauer, Aaron M., 2014, A phylogenetic analysis of the southern African gecko genus Afroedura Loveridge (Squamata: Gekkonidae), with the description of nine new species from Limpopo and Mpumalanga provinces of South Africa, pp. 451-501 in Zootaxa 3846 (4)</i> on page 474, DOI: 10.11646/zootaxa.3846.4.1, <a href="http://zenodo.org/record/250495">http://zenodo.org/record/250495</a>
Heterogeneous Catalytic Oxidation of R-(+)-Limonene on Jacobsen Type Catalysts. (Oxidación catalítica heterogénea de R-(+)-limoneno sobre catalizadores tipo Jacobsen)
No full textAbstractThe development of heterogeneous catalytic processes is highly desirable in order to overcome some drawbacks of homogeneous catalysts, such as the separation and recycling of these catalysts. In this work, we report that Jacobsen type catalysts are efficient and selective for the oxidation of R-(+)-limonene to its corresponding diepoxides using in situ generated dimethyldioxirane (DMD) as oxidant. It was demonstrated that the solid NaHCO3 addition to the initial reaction mixture, improves the catalytic activity. Additionally, catalyst samples can be recovered and reused at least twice without significant loss of its initial catalytic activity.ResumenEl desarrollo de procesos catalíticos heterogéneos es muy deseable dado que se pueden superar las dificultades que presentan los catalizadores homogéneos, tales como la separación y el reciclado de estos catalizadores. En este trabajo, reportamos que los catalizadores tipo Jacobsen son eficientes y selectivos para la oxidación de R-(+)-limoneno a sus correspondientes diepóxidos cuando dimetildioxirano generado in situ es utilizado como agente oxidante. Se demostró que la adición de NaHCO3 sólido, al inicio de la reacción, mejora la actividad catalítica. Además, el catalizador puede ser recuperado y reutilizado al menos dos veces sin pérdida significativa de su actividad catalítica inicial.
Hamblin Robert L., Jacobsen R. Brooke, Miller Jerry L.L — A mathematical theory of social change
No full textD. F. Hamblin Robert L., Jacobsen R. Brooke, Miller Jerry L.L — A mathematical theory of social change. In: Population, 30ᵉ année, n°1, 1975. p. 181
Afroedura namaquensis Jacobsen, Kuhn, Jackman & Bauer, 2014, stat. nov.
No full textA. namaquensis stat. nov. (FitzSimons, 1938) Distribution. Known from scattered localities in the Succulent Karoo Biome in the Little Namaqualand region of the Northern Cape Province (Bauer 2014 a) (Fig. 4). Remarks. Haacke (1965), in describing A. africana tirasensis considered A. namaquensis as a subspecies of A. africana, and it has maintained this rank since (Mertens 1971; Branch 1981, 1988, 1998; Onderstall 1984; Bauer 2014 a), although chiefly because this poorly known taxon has not been reviewed subsequently. Under modern species concepts, the differences between the supposed subspecies of A. africana— including precloacal pore counts, presence of internasal granules, gular scale counts, and color pattern (Haacke 1965) would generally be accepted as evidence of specific distinctness, especially in light of the large disjunctions between the forms and their likely low vagility (Mouton & Mostert 1985; Jacobsen 1997). On this basis we here recognize this taxon at the rank of full species.Published as part of Jacobsen, Niels H. G., Kuhn, Arianna L., Jackman, Todd R. & Bauer, Aaron M., 2014, A phylogenetic analysis of the southern African gecko genus Afroedura Loveridge (Squamata: Gekkonidae), with the description of nine new species from Limpopo and Mpumalanga provinces of South Africa, pp. 451-501 in Zootaxa 3846 (4) on page 470, DOI: 10.11646/zootaxa.3846.4.1, http://zenodo.org/record/25049
Afroedura tirasensis Jacobsen, Kuhn, Jackman & Bauer, 2014, stat. nov.
No full textA. tirasensis stat. nov. Haacke, 1965 Distribution. Farm Tiras, Lüderitz District, southern Namibia (Mouton & Mostert 1985; Griffin 2003) (Fig. 4). Remarks. Haacke (1965) originally described this form as a subspecies of A. africana, and it has maintained this rank since (Mertens 1971; Branch 1981, 1988, 1998; Onderstall 1984; Branch et al. 1988; Griffin 2003), although chiefly because this poorly known taxon has not been reviewed subsequently. Under modern species concepts, the differences between the supposed subspecies of A. africana (Haacke 1965) (see above) would generally be accepted as evidence of specific distinctness, especially in light of the large disjunctions between the forms and their likely low vagility (Mouton & Mostert 1985; Jacobsen 1997). On this basis we here recognize this taxon at the rank of full species.Published as part of Jacobsen, Niels H. G., Kuhn, Arianna L., Jackman, Todd R. & Bauer, Aaron M., 2014, A phylogenetic analysis of the southern African gecko genus Afroedura Loveridge (Squamata: Gekkonidae), with the description of nine new species from Limpopo and Mpumalanga provinces of South Africa, pp. 451-501 in Zootaxa 3846 (4) on page 470, DOI: 10.11646/zootaxa.3846.4.1, http://zenodo.org/record/25049
Cisgenesis: an important sub-invention for traditional plant breeding companies
No full textModern plant breeding is highly dependent on new technologies to master future problems. More traits have to be combined, frequently originating from wild species. Traditional breeding is connected with linkage drag problems. The crop plant itself and its crossable species represent the traditional breeders gene pool. GM-breeding is a new way of improving existing varieties. Transgenes originate from non-crossable species and are representing a new gene pool. For release of GM-plants into the environment and onto the market in Europe Directive 2001/18/EC has been developed, primarily based on GM-technology and not on gene source. In society, opposition against GM crops is complicating the implementation of GM crops. In this paper, it is shown that not only transgenes, representing a new gene pool but also cisgenes and intragenes are available, representing the breeders gene pool. Cisgenes are natural genes and intragenes are composed of functional parts of natural genes from the crop plant itself or from crossable species. Cisgenesis is the combined use of only cisgenes with marker-free transformation, mimicking linkage drag free introgression breeding in one step. Therefore, cisgenesis is a new sub-invention in the traditional breeding field and indicates the need for reconsideration of GM Directives. Inventions are frequently containing not only hardware elements, but also software and orgware elements. For cisgenesis it is foreseen that the technical (hardware) and bioinformatic (software) elements will develop smoothly, but that implementation in society is highly dependent on acceptance and regulations (orgware). It could be made in a step by step approach by specific crop-gene derogations from the Directive, followed by adding cisgenesis to annex 1b of Directive 2001/18/EC for exemption. At present GM crops can only be introduced by large companies. An open innovation approach for cisgenesis by public private partnership including traditional SMEs has been discussed. Cisgenesis has been exemplified for resistance breeding of potato to Phytophthtora infestans
Recent developments at the ANTARES AMS centre.
No full textA. M. Smith, D. Fink, M. A. C. Hotchkis, G. E. Jacobsen, E. M. Lawson, C. Tuniz, E. Sacchi, D. Louvat, G. M. Zuppi and R. Bonett
Oxidación catalítica heterogénea de R-(+)-limoneno sobre catalizadores tipo Jacobsen
No full textThe development of heterogeneous catalytic processes is highly desirable in order to overcome somedrawbacks of homogeneous catalysts, such as the separation and recycling of these catalysts. In this work,we report that Jacobsen type catalysts are efficient and selective for the oxidation of R-(+)-limonene to itscorresponding diepoxides using in situ generated dimethyldioxirane (DMD) as oxidant. It was demonstratedthat the solid NaHCO3 addition to the initial reaction mixture, improves the catalytic activity. Additionally,catalyst samples can be recovered and reused at least twice without significant loss of its initial catalyticactivity.El desarrollo de procesos catalíticos heterogéneos es muy deseable dado que se pueden superar las dificultades que presentan los catalizadores homogéneos, tales como la separación y el reciclado de estos catalizadores. En este trabajo, reportamos que los catalizadores tipo Jacobsen son eficientes y selectivos
para la oxidación de R-(+)-limoneno a sus correspondientes diepóxidos cuando dimetildioxirano generado in situ es utilizado como agente oxidante. Se demostró que la adición de NaHCO3 sólido, al inicio de la reacción, mejora la actividad catalítica. Además, el catalizador puede ser recuperado y reutilizado al menos
dos veces sin pérdida significativa de su actividad catalítica inicial.Fil: Cubillos Lobo, Jairo Antonio. Universidad Pedagogica y Tecnologica de Colombia. Facultad de Ciencias. Escuela de Quimica; ColombiaFil: Romanelli, Gustavo Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Centro de Investigación y Desarrollo En Ciencias Aplicadas; ArgentinaFil: Paez Guevara, L. A.. Universidad Pedagogica y Tecnologica de Colombia. Facultad de Ciencias. Escuela de Quimica; Colombi
Oxidación catalítica heterogénea de R-(+)-limoneno sobre catalizadores tipo Jacobsen
No full textThe development of heterogeneous catalytic processes is highly desirable in order to overcome somedrawbacks of homogeneous catalysts, such as the separation and recycling of these catalysts. In this work,we report that Jacobsen type catalysts are efficient and selective for the oxidation of R-(+)-limonene to itscorresponding diepoxides using in situ generated dimethyldioxirane (DMD) as oxidant. It was demonstratedthat the solid NaHCO3 addition to the initial reaction mixture, improves the catalytic activity. Additionally,catalyst samples can be recovered and reused at least twice without significant loss of its initial catalyticactivity.El desarrollo de procesos catalíticos heterogéneos es muy deseable dado que se pueden superar las dificultades que presentan los catalizadores homogéneos, tales como la separación y el reciclado de estos catalizadores. En este trabajo, reportamos que los catalizadores tipo Jacobsen son eficientes y selectivos para la oxidación de R-(+)-limoneno a sus correspondientes diepóxidos cuando dimetildioxirano generado in situ es utilizado como agente oxidante. Se demostró que la adición de NaHCO3 sólido, al inicio de la reacción, mejora la actividad catalítica. Además, el catalizador puede ser recuperado y reutilizado al menos
dos veces sin pérdida significativa de su actividad catalítica inicial.Centro de Investigación y Desarrollo en Ciencias Aplicada
Studier Tilegnede Professor Dr. Phil, et Theol. Frants Buhl, Redigeret af J. Jacobsen, 1925
No full textR. C. Studier Tilegnede Professor Dr. Phil, et Theol. Frants Buhl, Redigeret af J. Jacobsen, 1925. In: Revue d'histoire et de philosophie religieuses, 7e année n°1, Janvier-février 1927. p. 90
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