3,746 research outputs found
Pentaphlebia n. sp. Dijkstra, Kalkman, Dow, Stokvis & Tol, 2014, n. sp.
No full textPentaphlebia n. sp. Dijkstra, K.-D.B. & Vanappelghem, C. RMNH Gabon Haut-Ogooué 502559 25924867 KF369831 KF370230 KF369482 ODOPH216-13Published as part of Dijkstra, Klaas-Douwe B., Kalkman, Vincent J., Dow, Rory A., Stokvis, Frank R. & Tol, Jan Van, 2014, Redefining the damselfly families: a comprehensive molecular phylogeny of Zygoptera (Odonata). Supporting Information Table 2: List of analysed samples., pp. 1-10 in Systematic Entomology 39 (1) on page 7, DOI: 10.5281/zenodo.665290
Enkele herinneringen aan Jan Dijkstra (29 april 1907 – 20 maart 2006)
No full textMemories of Jan Dijkstra (April 29, 1907 – March 20, 2006). On March 20, 2006 the former administrator of the Biologisch-Archaeologisch Instituut, Jan Dijkstra, died at the age of nearly 99 years. In 1922, aged 15, he had entered service with the university service. Together with draughtsman Lambertus Postema and field technician Jan Lanting he formed the team that assisted Van Giffen at his successful excavations of megalithic tombs, barrows, urn fields and dwelling mounds (and with the resulting publications) in the pioneer period of the Institute before the Second World War
Africallagma quingentum Dijkstra, sp. nov.
No full textAfricallagma quingentum Dijkstra sp. nov. – Green-fronted Bluet (Type Photo 12, Photo 19, Fig. 8) Taxonomy Genetically and morphologically very close to the sympatric A. sinuatum (Ris, 1921) but easily separated by details of male coloration and appendages; thus treated as a distinct species by Dijkstra & Clausnitzer (2014), who used the grammatically erroneous name A. quingenti. Material studied Holotype ♂ . RMNH.INS.505540, Congo-Kinshasa, Katanga, Upemba National Park, Mukana, west of Lusinga, depressions with (seasonal) marsh, bog lakes and gallery forest in open grassy plains, 1770 – 1840 m a.s.l. (8.91 ° S 27.18 ° E), 13–14 -xi- 2011, leg. K.-D.B. Dijkstra, RMNH. Further material. CONGO-KINSHASA (Katanga): 8 ♂ (RMNH.INS.505526, RMNH.INS.505527, RMNH.INS.505528), 1 ♀ (RMNH.INS.505529), Upemba National Park, Lufwi, smaller source of Kafwi, dried bog beside gallery forest, 1825 m a.s.l. (8.9426 ° S 27.1302 ° E), 13 -xi- 2011, leg. K.-D.B. Dijkstra, RMNH. Genetics One haplotype (n = 5) shared with A. sinuatum (n = 9; 7 additional haplotypes), which in turn shares one haplotype with A. fractum (Ris, 1921) (n = 7; 1 additional): the three species are thus probably indistinguishable in COI. Male morphological diagnosis Most similar to A. sinuatum by (a) fairly large size, Hw 18.0–19.0 mm (n = 5); (b) mostly blue postclypeus; and (c) cerci that are only slightly longer than paraprocts, sinuous in dorsal view, with rather short apex that is not very distinct from the quite short and strongly hooked ventral process (Fig. 8). However, (1) the face and ante-humeral stripes are pale green, not blue, and thus contrast with the blue sides of the thorax; (2) Pt are pale brown rath- er than blackish with maturity; (3) the dorsum of S 2 is blue with a broad black subapical spot, instead of a continuous though sometimes basally and apically reduced black band; (4) the cerci are narrower in lateral view; and (5)the apical teeth of the paraprocts are reduced to form pale blunt corners (Fig. 8). Etymology Latin name “of five hundred” alludes to this being the 500 th species of African Odonata recorded in the field by the lead author (to be treated as a plural genitive noun). Although the normal genitive plural in neuter would be quingentorum, we prefer the shorter form quingentum used by some older classic authors. Range and ecology Found with its presumed sister-species A. sinuatum among tussocks of grass in an open dried-out bog between 1 770 and 1 840 m a.s.l. on the Kibara Plateau in Upemba National Park (Photo 19).Published as part of Dijkstra, Klaas-Douwe B., Kipping, Jens & Mézière, Nicolas, 2015, Sixty new dragonfly and damselfly species from Africa (Odonata), pp. 447-678 in Odonatologica 44 (4) on pages 497-499, DOI: 10.5281/zenodo.3538
Smediger kaas door juiste voer
No full textVeel kaasmakers willen smedige (zachte, smeuïge) kaas maken, want de gemiddelde consument vindt die kaas het lekkerst. Kasper Hettinga en Jan Dijkstra van Wageningen Universiteit vertellen hoe de smedigheid van kaas kan worden beïnvloed door de samenstelling van het veevoer
Zendingsarchitect Pieter Simon Dijkstra en zijn Nederlandse werken
No full textPieter Simon Dijkstra (1884-1968) is regarded as a noted Protestant church designer in South Africa, but his contribution to the built environment in the Netherlands is much less well known. His life and career in the country of his birth are of interest because they are closely aligned with the religious turbulence of the period, in which the anti-revolutionary clergyman-politician Abraham Kuyper played a prominent role. The building of new Reformed churches and schools was a direct expression of the zealous determination to spread the ‘true faith’. The architecture of the new Reformed churches was often modest and restrained, influenced by Kuyper’s view that the church space should serve the ‘gathering of the faithful’ and be arranged in such a way that congregants could see and hear one other and the minister. Dijkstra, born to a clergyman father with a missionary zeal, delivered various designs in this Reformed context.Although Dijkstra grew up and trained in the northern Netherlands, Zeeland became his main area of operation. In 1908, after time spent working in Groningen (Spijk) and Germany, Dijkstra settled in Vlissingen (Flushing) where he set up his own architectural practice. At the time Vlissingen was an internationally oriented city undergoing a radical transformation under the direction of the liberal alderman of public works, J.G. van Niftrik jr. (1889-1924). Dijkstra designed two new hall-type Reformed churches: one in Geersdijk (1910) and the Eben Haëzer church in Vlissingen (1910). There followed a remarkable inter-denominational collaboration after the English Presbyterian community’s place of worship in the St Jacob’s Church was destroyed by fire in 1911. After Dijkstra’s initial design for a simple hall church was rejected, the authoritative Catholic architect Pierre Cuypers (1827-1921) was commissioned to provide a sketch design for a small yet monumental building. Cuypers’ design for a neogothic church based on an octagonal plan was further elaborated by Dijkstra. The church was inaugurated in 1914.This unique project was followed by the Vlaswiek Reformed Church in Bovensmilde (Drenthe, 1915) and the Reformed Church in Kamperland (Noord-Beveland, 1923). The design for this robust church with corner tower and amphitheatre arrangement is in line with Kuyper’s views and foreshadows Dijkstra’s later church designs in South Africa.Dijkstra designed school buildings for the various Reformed communities in and around Vlissingen (in Koudekerke and Arnemuiden) and social housing estates, including three for the Protestant-Christian housing association Gemeenschappelijk Belang (Common Interest), partly in collaboration with P.J. Hamers (1882-1966). Among his commissions for retail spaces is the striking expressionist radio shop he designed for H.J. van der Meer en Zonen (1923 and 1926), still extant. In 1927, all out of the blue, Dijkstra decided to emigrate with his family to South Africa, where he continued to develop as a Reformed church architect. This article not only provides an assessment of his Dutch oeuvre as a prefiguration of his South African work, but it also positions him as an interesting architect within the Dutch context of his day, characterized as it was by verzuiling (lit. ‘pillarization’, a form of compartmentalization along socio-political or religious lines).Heritage & ValuesHeritage & Architectur
Van Industrie gebied naar Artpark - De transformatie van het voormalig kortsluitlaboratorium van de KEMA Arnhem tot een Filmtheater
No full textAfstudeerpresentatie, ontwerpbeschrijving en reflectie/afstudeerrapport van Rikst Dijkstra. Over het transformeren van een voormalig kortsluitlaboratorium van de KEMA te Arnhem naar een FilmtheaterRMITArchitectur
Phaon camerunensis Sjostedt 1899
No full textPhaon camerunensis Sjöstedt 1899 Dijkstra, K.-D.B. RMNH Democratic Republic of Congo Province Orientale 502115 25924828 KF369838 KF370237 KF369488 ODOPH047-13 Calopterygidae Phaon camerunensis Sjöstedt 1899 Dijkstra, K.-D.B., Kipping, J. & Schütte, K. RMNH Cameroon Centre Province 500146 25924787 KF369839 KF370238 KF369489 ODOPH048-13Published as part of Dijkstra, Klaas-Douwe B., Kalkman, Vincent J., Dow, Rory A., Stokvis, Frank R. & Tol, Jan Van, 2014, Redefining the damselfly families: a comprehensive molecular phylogeny of Zygoptera (Odonata). Supporting Information Table 2: List of analysed samples., pp. 1-10 in Systematic Entomology 39 (1) on page 2, DOI: 10.5281/zenodo.665290
Nubiolestes diotima
No full textNubiolestes diotima (Fraser) 1944 Dijkstra, K.-D.B. & Schütte, K. RMNH Cameroon Southwest Province 500110 25924728 KF369809 KF370208 KF369466 ODOPH344-13 Synlestidae Nubiolestes diotima (Fraser) 1944 Dijkstra, K.-D.B. & Schütte, K. RMNH Cameroon Southwest Province 229206 25925249 KF369808 KF370207 KF369465 ODOPH345-13Published as part of Dijkstra, Klaas-Douwe B., Kalkman, Vincent J., Dow, Rory A., Stokvis, Frank R. & Tol, Jan Van, 2014, Redefining the damselfly families: a comprehensive molecular phylogeny of Zygoptera (Odonata). Supporting Information Table 2: List of analysed samples., pp. 1-10 in Systematic Entomology 39 (1) on page 10, DOI: 10.5281/zenodo.665290
Zygonyx annika Dijkstra, sp. nov.
No full textZygonyx annika Dijkstra sp. nov. – Annika’s Cascader (Type Photo 58, Photo 75, Fig. 35) Taxonomy Variation in markings and male genitalia suggests that a complex exists of species similar to Z. flavicosta (Sjöstedt, 1900), but thus far only Z. geminuncus Legrand, 1997 has been separated. Morphology and COI data suggest that at least six species are involved, with two or even three occurring in close proximity. Variation among specimens nearest to the true Z. flavicosta is so great that we only name three species that can be separated from sympatric relatives by both genetics and morphology (Tree 10). The present taxon is known only from a pair caught in copula, which overlaps geographically with morphologically and genetically distinct populations that were identified as Z. flavicosta. Material studied Holotype ♂ . RMNH.INS.503187, Sierra Leone, Eastern Province, 40 km SW of Kenema, Moa River at Tiwai Island, forested island in large river with rocky rapids (Photo 75), 122 m a.s.l. (7.551 ° N 11.3549 ° W), 14 -iii- 2011, leg. K.-D.B. Dijkstra, RMNH. The right Hw and leg are aberrant in shape, which is probably a developmental defect. Further material. SIERRA LEONE (Eastern Province): 1 ♀ (RMNH.INS.503188), in copula with holotype, RMNH. Genetics One unique haplotype (n = 2) is distinct and nearer to Z. dionyx sp. nov. and Z. geminuncus than the morphologically similar Z. flavicosta (Tree 10). Male morphological diagnosis Belongs to the flavicosta -complex by (a) the modest size, Hw 36.5 mm (n = 1); (b) the moderately dense venation, with 13 ½– 14 Ax in Fw; (c) the largely black hind legs; (d) the pointed and forward-curved apex of the anterior lamina (Fig. 35); and (e) the pale dorsal band on S 7 that stands out against the largely dark S 5–6. Differs from the sympatric Z. flavicosta by (1)the dorsum of the eyes being deep reddish brown, contrasting with their greyish underside, rather than uniformly grey-blue; and (2) the shorter hook of hamule, which is less than a third as long as the hamule is wide (Fig. 35). Also differs from Z. flavicosta from Sierra Leone, Liberia and Gha- na by (3) the Hw membrane being darkly stained and not clear beside the membranule; (4) the more continuous pale thoracic markings, the stripe on the metepisternum not being broken between the metastigma and wing base, while that on the metepimeron is not invaded by black posteriorly to appear T-shaped; and (5) the straighter cerci (Fig. 35). Etymology Named in honour of Dr Annika Hillers, who advanced research on the Gola rainforest ecosystem and enabled the author to make his contribution (noun in apposition). Range and ecology Rocky fast-flowing section of the large Moa River in Sierra Leone, flanked by gallery forest and about 120 m a.s.l. Similar adults and possible exuviae were seen near Kenema 35 km upstream, but Z. flavicosta is sympatric and possibly syntopic.Published as part of Dijkstra, Klaas-Douwe B., Kipping, Jens & Mézière, Nicolas, 2015, Sixty new dragonfly and damselfly species from Africa (Odonata), pp. 447-678 in Odonatologica 44 (4) on pages 661-665, DOI: 10.5281/zenodo.3538
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