1,728,363 research outputs found
Van bloem tot komkommer (interview met Jan Janse)
No full textVan bloem tot komkommer De verkoop van komkommers is ingezakt door de commotie over de darmbacterie Ehec. De komkommers móeten geoogst, er zit niets anders op. Het telen van komkommers is precisiewerk. Als de vruchten oogstrijp zijn, kun je ze niet zomaar een paar dagen langer laten zitten. ,,Dan worden ze te groot, en zijn ze niet meer te verkopen. Als de komkommers te zwaar worden, gaat dat bovendien ten koste van de kleine vruchtjes aan dezelfde plant. En dan heb je over een week geen productie'', zegt Jan Janse, gewasonderzoeker komkommer van de Wageningen UR Glastuinbouw. Ruim 200 van de ongeveer 290 Nederlandse telers van komkommers zagen hun afzet de afgelopen dagen volledig instorten. Normaal worden er in deze tijd wekelijks 30 miljoen komkommers uitgevoerd, vooral naar Duitsland. Ook al is er geen enkele aanwijzing of bewijs dat de Nederlandse komkommers iets te maken hebben met de darminfectie die in het noorden van Duitsland huishoudt, de Duitsers hebben even geen zin meer in onze calorie-arme, frisse en gezonde rauwkost. In Nederlandse supers gaan ze eveneens watminder snel over de toonbank. De komkommers aan de plant laten zitten, kan echter niet. ,,Er moet nu elke dag geoogst worden'', zegt Janse. Alle komkommers in Nederland worden onder glas geteeld. De meeste tuinders wisselen de planten drie keer per jaar. Ze zittennuin de tweede teelt. Eind juli, begin augustus begint de derde. De telers kopen het jonge goed van speciale bedrijven die de komkommerplant in drie weken tijd opkweken van zaadje tot plantje van 40 centimeter hoog. In de 3meter hoge kassenworden de jonge planten in substraat gezet, meestal steenwol. Een kubieke meter basalt levert 50 kuub steenwol. Daarop kunnen ongeveer een miljoen komkommers groeien. De steenwol wordt vervolgens weer verwerkt tot 8 kubieke meter baksteen, zegt Vincent Deenen van steenwolproducent Grodan. Als de planten van de eerste teelt zijn weggehaald, kun je dezelfde dag nog nieuwe planten zetten, aldus Janse. Dan duurt het nogwel even-somsal binnen drie weken - voor die plant vruchten geeft. Hijmoet eerst flink groeien, rondom een draad tot ongeveer 2 meter hoogte. Twee zijscheuten krijgen daar de ruimte om horizontaal door te groeien. Naast elke plant staat een druppelaar voor de voeding - bijvoorbeeld kalium en stikstof - en het water. Per vierkante meter oogst een teler zo'n 165 tot 200 komkommers per jaar. De vruchten groeien in de bladoksels van de plant. Bestuiving is niet nodig. Van bloem tot volwassen komkommer is een razendsnel proces. In de winter kan het drie weken duren, maar in deze tijd heb je al binnen een week een rijp product. Als hij 350 tot 400 gram weegt, moet je 'm afsnijden. Janse: ,,Naar een komkommer van 800 gram is geen vraag.'
A Cosmopolitan History of Archaeology: The Olov Janse Case
No full textThe life of international archaeologist Olov
Janse (1892–1985) demonstrates the complexity of personal identify formation. Janse
worked in Europe, Scandinavia, South East Asia and North America, spoke many different
languages, controlled many collections of artefacts, changed identity or character at
least five times, and nationality, three times. It is hoped the themes, elucidated
through Janse’s story, will encourage comparisons with, and analyses of, the careers of
other cosmopolitan archaeologists, and instigate an international history of archaeology
focused on mobility, translation and networks, rather than one based on the impact of
archaeology on the development of nation-states. A correction article relating to the abstract and author
affiliation of this publication can be found here: http://dx.doi.org/10.5334/bha.24
Translated Objects : The Olov Janse Case
No full textThis article explores the movements of archaeological and ethnographic objects and museum collections connected with the Swedish-born archaeologist and ethnographer Olov R. T. Janse (1892–1985). Janse pursued a cosmopolitan career in the years between 1920 and 1960, in and between the national contexts of Sweden, France, Indochina, the Philippines, and the United States, where he found himself in different political contexts such as colonialism, nationalism, and the Cold War. He initiated object exchanges between French and Swedish museums, and he collected archaeological and ethnographic objects from Indochina and the Philippines for museums in Sweden, France, and the United States. The complexity of object movements in the wake of Olov Janse's career suggests that we should think and talk about object mobility in terms of translation rather than simple transmission. In seven sections, each exploring one chapter of Janse's life, we discuss how changes in world politics became entangled with changes in Janse's own position as an archaeologist and ethnographer, affecting the movements of objects and contributing to an active translation of their meaning.</p
Deltophora Janse
No full textDeltophora Janse Deltophora, Janse, 1950: 121. Type species. Xenolechia peltosema Lower sensu Janse, 1950 (= Deltophora typica Sattler, 1979). Host-plants. Caprifoliaceae, Orobanchaceae, Phyllanthaceae. Parasite. Copidosoma glandiferellae Barron et Bisdee (Chalcidoidea, Encyrtidae) in Deltophora glandiferella (Zeller) (Barron & Bisdee 1984). Distribution. Tropical and temperate parts of the world. Distribution of Asian species shown in Fig. 1.Published as part of Li, Houhun, Wang, Zhibo & Sattler, Klaus, 2016, Two new species of the genus Deltophora Janse, 1950 (Lepidoptera: Gelechiidae), pp. 77-84 in Zootaxa 4061 (1) on page 78, DOI: 10.11646/zootaxa.4061.1.8, http://zenodo.org/record/27037
Lecithocera aenicta Janse 1954
No full text<i>Lecithocera aenicta</i> Janse, 1954 <p>(Fig. 3F)</p> <p> <i>Lecithocera aenicta</i> Janse, 1954: 337. TL: Verulam, South Africa. [TMSA].</p> <p> <b>Adult</b> (Fig. 3F). See also Janse (1954, Pl. 156, Fig. 1). Wingspan 12 <i>–</i> 15 mm.</p> <p> <b>Diagnosis.</b> <i>Male genitalia</i>. See Janse (1954, Pl. 140, Fig. 14- line drawing). Similar to those of <i>Lecithocera myopa</i> but terminal two-thirds of valva parallel-sided and only a little narrower than basal third, whereas in <i>L</i>. <i>myopa</i> the terminal two-thirds of valva are very narrow and tapering. The figure given by Janse (Pl. 151, Fig. 6) is erroneous (see Remarks below).</p> <p> <b>Material examined</b>. Type no. 3349, ♂ (holotype), [South Africa], Verulam, 28 i 1914, Janse, gen. slide no. 5760). Paratypes: 2♂. types no. 3350 (Umkomaas, 22 i 1914, Janse) and 3352 (Pretoria, 16 i 1917, H.G. Breyer); and 1 paratype in NHMUK. Additional specimens in TMSA: 1♂, Port North, 17 i 1917, C.J. Swierstra, gen. slide no. 5635.</p> <p> <b>Distribution</b>. South Africa (Gauteng, KwaZulu-Natal) (Janse 1954).</p> <p> <b>Remarks</b>. Janse (1954) illustrated the male genitalia of the types on Plate 140, Fig. 14, and also on Plate 151, Fig. 6, but they represent two different species. The figure of the former matches well the description of the male genitalia and the latter looks like those of <i>L. ideologa</i> Meyrick, 1937. Additional specimens are placed under the names of these two species; more than 10 under the name of <i>L. aenicta</i> and four under <i>L. ideologa</i> in the collection of TMSA, and they are probably misidentifications of other species (4♂, Knysna, C.P., Garden of Eden, 16–20 i 1955, A.J.T. Janse, gen. slide nos. 2885, 8645, 8662, & 8663; 3♀, same data as preceding specimens; and 1♂, 1♀, same locality, 10–14 i 1955, A.J.T. Janse). The genitalia of these specimens should be re-examined one by one in a future study (the first author had no time to examine all of them, due to the limited time of his visiting period). One male of the series was re-identified as <i>L. ideologa,</i> based on the examination of its genitalia (see the details in the “Remarks” of <i>L. ideologa.</i></p>Published as part of <i>Park, Kyu-Tek & Prins, Willy De, 2019, A review of the Lecithoceridae (Lepidoptera: Gelechioidea) of southern Africa, based on type specimens deposited in the Ditsong National Museum of Natural History (TMSA), with descriptions of three new species, pp. 61-89 in Zootaxa 4623 (1)</i> on pages 70-71, DOI: 10.11646/zootaxa.4623.1.5, <a href="http://zenodo.org/record/3253578">http://zenodo.org/record/3253578</a>
Hypotephrina Janse 1932
No full text<i>HYPOTEPHRINA</i> JANSE <p> <i>Hypotephrina</i> Janse, 1932. Type species: <i>Tephrina exmotaria</i> Walker, 1861. South Africa.</p> <p> <i>Hypotephrina</i> was placed in Janse’s treatment of the South African Ennominae immediately after <i>Tephrina</i>. Janse did not attempt to distinguish the Macariini as a distinct taxon. The uncus is absent and the valvae are undivided (see Janse, 1932: figs 90, 92) and there appears to be no reason to include the genus in the Macariini.</p>Published as part of <i>Scoble, Malcolm J. & Krüger, Martin, 2002, A review of the genera of Macariini with a revised classification of the tribe (Geometridae: Ennominae), pp. 257-315 in Zoological Journal of the Linnean Society 134 (3)</i> on page 313, DOI: 10.1046/j.1096-3642.2002.00008.x, <a href="http://zenodo.org/record/5434168">http://zenodo.org/record/5434168</a>
Atrichozancla Janse 1949
No full textGenus Atrichozancla Janse, 1949 Type species: Eridachtha phaeocrossis Meyrick, 1937. The genus Atrichozancla Janse is differentiated from Lecithocera Herrich-Schäffer by the forewing venation with R 3 free in Atrichozancla, R 5 extending to termen, well below apex; and the hindwing venation with M 2 absent in Atrichozancla. Janse (1954) noted that Atrichozancla Janse can be distinguished from Eridachtha Meyrick by the forewing venation with R 3 free in Atrichozancla whereas in Eridachtha R 3 is stalked with R 4+5, as indicated in the description of the genus. However, Janse (1954) did not mention the other main diagnostic character of the forewing venation with CuA 1 and CuA 2 free in Atrichozancla, while they are stalked in Eridachtha. Moreover, the labial palpus is covered with long scales in Atrichozancla, and not so in Eridachtha. Only three species belonging to the genus Atrichozancla are known from the Afrotropical Region.Published as part of Park, Kyu-Tek & Prins, Willy De, 2019, A review of the Lecithoceridae (Lepidoptera: Gelechioidea) of southern Africa, based on type specimens deposited in the Ditsong National Museum of Natural History (TMSA), with descriptions of three new species, pp. 61-89 in Zootaxa 4623 (1) on page 64, DOI: 10.11646/zootaxa.4623.1.5, http://zenodo.org/record/325357
Atrichozancla gymnopalpa Janse 1963
No full text<i>Atrichozancla gymnopalpa</i> Janse, 1963 <p>(Figs. 3A, 4 A–C)</p> <p> <i>Atrichozancla gymnopalpa</i> Janse, 1963: 246. TL: Zimbabwe. [TMSA].</p> <p> <b>Adult</b> (Fig. 3A). See Janse (1963, Pl. 134, Fig. e). Wingspan 16 <i>–</i> 17 mm.</p> <p> <b>Diagnosis</b>. The pale orange-yellow ground color of the forewing and the 2 nd segment of labial palpus with long, spreading yellowish hairs above are distinct characters which separate this species from both <i>A. cosymbota</i> and <i>A. phaeocrossis</i> Meyrick. Labial palpus given in Janse (1963, Pl. 162, Fig. 4).</p> <p> <i>Male genitalia</i> (Figs. 4A, B). The male genitalia are similar to those of <i>A. cosymbota,</i> but the cucullus is nearly parallel-sided distally, whereas it is narrowed apically in <i>A. cosymbota</i> (see also Janse (1960, Pl. 108- line drawing; Pl. 127, Fig. g- photo). The male genitalia of a paratype in the TMSA are illustrated in Figs. 4A, B.</p> <p> <i>Female genitalia</i>. See Janse (1960, Pl. 108 (corpus bursae); Pl. 127, Fig. h- photo).</p> <p> <b>Material examined</b>. Types no. 4425, ♂ (lectotype, designated here), Zimbabwe, iv.1954, A.J.T. Janse, deposited in TMSA (Fig. 3A). Paralectotypes: 2♂, types no. 4447 & 4475 (gen. slide no. 2997 & 8347); 1♂, type 4430, Zimbabwe, 6-10 iv 1934, A.J.T. Janse; det. label <i>A</i>. <i>gymnopalpa</i> Janse, gen. slide no. CIS-7206/Park.</p> <p> <b>Distribution</b>. Zimbabwe (Janse 1963).</p> <p> <b>Remarks</b>. The species was described, based on 6 males and 18 females collected in April by A.J.T. Janse.</p>Published as part of <i>Park, Kyu-Tek & Prins, Willy De, 2019, A review of the Lecithoceridae (Lepidoptera: Gelechioidea) of southern Africa, based on type specimens deposited in the Ditsong National Museum of Natural History (TMSA), with descriptions of three new species, pp. 61-89 in Zootaxa 4623 (1)</i> on page 67, DOI: 10.11646/zootaxa.4623.1.5, <a href="http://zenodo.org/record/3253578">http://zenodo.org/record/3253578</a>
Neotelphusa similella Janse 1958
No full textNeotelphusa similella Janse, 1958 Neotelphusa similella Janse, 1958: 92. TL: Zimbabwe, Bulawayo. Material examined. 2♂, LepsocAfrica CRG, M1377b, Gelechioidea, reared on Ozora sphaerocarpa, Anacardiaceae, Trackers, South Africa, Limpopo, Hoedspruit, 24˚275’33”S, 30˚49’32”E, 21.x.2016 eclosed (A. & I. Sharp) (gen. slide 126/19, 182/20, O. Bidzilya) (HSS). Biology. The larva was observed feeding on Ozora sphaerocarpa (Anacardiaceae). Adult emerged 21.x (Staude et al. 2020: 57, as Neotelphusa sp. 5). Distribution. South Africa (new record), Zimbabwe (Janse 1958: 93).Published as part of Bidzilya, Oleksiy, 2021, New host-plants records of Afrotropical Gelechiidae (Lepidoptera), with description of three new species, pp. 495-522 in Zootaxa 4952 (3) on page 508, DOI: 10.11646/zootaxa.4952.3.4, http://zenodo.org/record/469057
Whole cell fatty acid analysis as a tool for classification of phytopathogenic pseudomonas bacteria
No full textIn this thesis some members of the plant pathogenic bacterial genus Pseudomonas have been studied. Conventional morphological, biochemical, physiological and pathogenitcity tests as well as a 'finger-print' technique, viz. automated whole cell fatty acid analysis, were used. The taxonomy of the plant pathogenic Pseudomonas bacteria is in many cases unsettled. Not in the last place this is because plant pathogenicity is difficult to assess and its value in taxonomy is differently estimated. The genus Pseudomonas has been subdivided on the basis of DNA-r(ibosomal) RNA homology studies into four rRNA groups. Fluorescent plant pathogens are found in group I, non-fluorescent species in group II (Chapter 1.2.).Whole cell fatty acid analysis has been found very useful in the classification of phytopathogenic bacteria. Especially the development of the Microbial Identification System (MIS) of Microbial ID. Inc. Newark, USA enables rapid and reliable determination of fatty acid patterns and has enhanced its use in bacterial taxonomy (Chapter 1.3.). The MIS has been used in all my studies on fatty acids of plant pathogens.At first a bacterium was studied which was well known in our laboratory, viz. the fluorescent P.syringae subsp. savastanoi, causing excrescences on Oleaceae and Nerium oleander. Based on pathogenicity, host range and plant hormone production three pathogenic varieties of this bacterium could be distinguished (Chapter II.1.). With fatty acid analysis (FAA), the three pathovars could also be distinguished, leading to the notion that pathogenicity of primary plant pathogens is not just one phenotypic factor, but it is also reflected in the bacterial membranes, where most fatty acids are present (Chapter II.2.).Subsequently the important non-fluorescent plant pathogen P.solanacearum was investigated. From this bacterium, which causes a devastating vascular disease on many different food crop plants, both biochemical and pathogenic varieties have been described. The occurrence of biochemical varieties could not be confirmed by FAA. Apparently differences in the ability to metabolize a few carbon compounds have no effect on fatty acid composition. As was the case with P.s. subsp. savastanoi, pathogenic varieties of P. solanacearum could be discriminated by FAA. Fatty acid patters of P. solanacearum were also studied in relation to those of other members of rRNA-group II, such as P.cepacia , P. gladioli , P. caryophylli and P. pickettii. The taxonomic patterns found were in good congruence with those determined in DNA-DNA homology studies by other authors. This once more confirms that FAA is a powerful additional tool in the classification of bacteria (Chapter II.3.).Finally the very complex group of the fluorescent, oxidase positive soft rot Pseudomonas bacteria was studied. These bacteria are opportunistic plant pathogens, especially important in post harvest situations. They have been found to be biochemically indistinguishable from saprophytic pseudomonads such as P.fluorescens biovars, P.putida and P.chlororaphis (incl. P.aureofaciens). On the basis of their ability to hydrolyze pectin and to cause soft rot, they have been named P. marginalis. In this study soft rot strains were biochemically similar to biovars of P. fluorescens or intermediates of these biovars, unknown forms of P. fluorescens, or similar to P. putida and P.chlororaphis. With FAA, oxidase positive sof rot pseudomonads were all found in a heterogeneous super cluster with saprophytic strains biochemically identified as P. fluorescens biovars or intermediates, P.chlororaphis and P.putida.Therefore it is suggested to abandon the use of ' P.marginalis ' and to name oxidase positive fluorescent soft rot bacteria ' P. fluorescens ', with some additional information between brackets, e.g. P.fluorescens (pectolytic, soft rot strain).P. aeruginosa strains from plants, animals and men were found in a very homogeneous cluster, well separated from the P.fluorescens supercluster. A supposed plant pathogenicity of P.aeruginosa could not be confirmed. This bacterium can multiply and cause some necrotic action only occasionally on plant material under special (unknown) circumstances. Certain non-pectolytic, non-soft rot strains of P. fluorescens are described which cause bacterial stripe symptoms on Iris sp. The pathogenicity factors of the Iris strains have not been substantiated (Chapter II.4.).Fatty acid analysis has been shown to be a welcome and useful tool in elucidation of natural relations between plant pathogenic Pseudomonas bacteria. Fatty acid analysis in combination with other methods such as conventional phenotypic tests and DNA-and protein fingerprinting may lead to a better understanding of this interesting group of bacteria, not in the last place to achieve a better disease control (Chapter III)
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