6,580 research outputs found
Brachyrhynchoides oosterlyncki (Willems, Reygel & Artois, 2013) Willems, Reygel & Artois 2013
No full text<i>Brachyrhynchoides oosterlyncki</i> (Willems, Reygel & Artois, 2013) Willems, Reygel & Artois, 2013 <p> <b>Known distribution.</b> South Africa, iSimangaliso Wetland Park, Eastern Shores, Mission Rocks; India, Goa, Anjuna beach (see Artois <i>et al.</i> 2013b for details).</p> <p> <b>Material.</b> Several animals studied alive. Two whole mounts from South Africa, and two from India. <b>Additional remarks.</b> This species was recently described by Artois et al (2013b), whom we refer to for the details.</p>Published as part of <i>Willems, Wim R., Reygel, Patrick, Steenkiste, Niels Van, Tessens, Bart & Artois, Tom J., 2017, Kalyptorhynchia (Platyhelminthes: Rhabdocoela) from KwaZulu-Natal (South Africa), with the description of six new species, pp. 441-466 in Zootaxa 4242 (3)</i> on page 452, DOI: 10.11646/zootaxa.4242.3.2, <a href="http://zenodo.org/record/376905">http://zenodo.org/record/376905</a>
Deprez (Ada). Brieven van, aan en over Jan Frans Willems 1793-1846, Algemene Inleiding Deprez (Ada). Brieven van, aan en over Jan Frans Willems 1793-1846
No full textVan Vlierden B. F. Deprez (Ada). Brieven van, aan en over Jan Frans Willems 1793-1846, Algemene Inleiding Deprez (Ada). Brieven van, aan en over Jan Frans Willems 1793-1846. In: Revue belge de philologie et d'histoire, tome 46, fasc. 1, 1968. Antiquité - Oudheid. pp. 109-110
Deprez (Ada). Brieven van, aan en over Jan Frans Willems 1793-1846, Algemene Inleiding Deprez (Ada). Brieven van, aan en over Jan Frans Willems 1793-1846
No full textVan Vlierden B. F. Deprez (Ada). Brieven van, aan en over Jan Frans Willems 1793-1846, Algemene Inleiding Deprez (Ada). Brieven van, aan en over Jan Frans Willems 1793-1846. In: Revue belge de philologie et d'histoire, tome 46, fasc. 1, 1968. Antiquité - Oudheid. pp. 109-110
La myxomatose en Belgique
No full textWillems B., Schyns P. La myxomatose en Belgique. In: La Terre et La Vie, Revue d'Histoire naturelle, tome 10, n°3-4, 1956. pp. 189-199
Brachyrhynchus oosterlyncki Willems, Reygel & Artois, n. sp.
No full text<i>Brachyrhynchus oosterlyncki</i> Willems, Reygel & Artois n. sp. <p>(Figs 3 C; 4C–E)</p> <p> <b>Localities.</b> South-Africa, KwaZulu-Natal, iSimangaliso Wetland Park, Eastern Shores, Mission Rocks, 28°16'50.4"S, 32°29'06.5"E), highly-exposed tidal area with sandstone terrace covered with a high diversity of organisms (barnacles, mussels, limpets, corals, tunicates, algae), sand and green algae from rock pool in lower eulittoral zone, 0 5 December 2009 (TYPE LOCALITY). India, Goa, Anjuna beach, 15°34’2.8”N, 73°44’28.5”E, algae and sand, salinity 35‰, 0 3 December 2008; same locality, green and brown algae, salinity 35‰, 0 3 December 2008; same locality, algae and sponges from exposed part of beach, salinity 35‰, 12 December 2008; same locality, coarse-grained sand and shell gravel in protected bay, salinity 35‰, 12 December 2008.</p> <p> <b>Studied material.</b> Three animals studied alive. One whole mount from South-Africa, designated holotype (SMNH, no. 7833). Two whole mounts from India, deposited as voucher specimens (HU, nos VI.1.45–VI.1.46). <b>Etymology.</b> Species dedicated to Mr. Kristof Oosterlynck, a close friend of W. Willems.</p> <p> <b>Description.</b> Colourless and slender animals, 0.5–1 mm long (measured on whole mounts). Habitus and internal organisation identical to that of both other species of <i>Brachyrhynchus</i> <b>n. gen.</b>, based on observations of live individuals (Fig. 4 C–D). Differences are to be found in the size and detailed structure of the hard parts in the male genital system and the stylet-to-stylet ratios.</p> <p> The prostate stylet (Figs 3 C; 4E: pst) is a single-walled, hollow tube, which has approximately the same width over its entire length. Distally, the tube narrows asymmetrically, forming a narrow opening. In the South-African specimen, this stylet is 77 µm long and 8 µm wide proximally, whereas it is 71–72 µm long and 9–12 µm wide proximally in the Indian specimens (n = 2). Both accessory stylets (Figs 3 C; 4D: ast1 & 2) are needle-like, widening proximally. Observations on live material did not allow us to identify which of the two accessory stylets is connected to the larger of the two accessory vesicles. These accessory stylets differ slightly in length, and are slightly to heavily curved, depending on the degree of squeezing. In the South-African specimen they measure 40 and 42 µm, in the Indian specimens 41–42 µm (n = 2) and 44–48 µm (n = 2) respectively. With the shortest one arbitrarily considered first accessory stylet, and using the same symbols as in the description of <i>B. triplostylis</i> <b>n. sp.</b>, the stylet-to-stylet ratios are: α = 52%; β = 55%; γ = 105% in the specimen from South Africa and α = 57–59%; β = 61–67%; γ = 107–114% in the specimens from India.</p> <p> <b>Diagnosis.</b> Species of <i>Brachyrhynchus</i> with an obliquely cut-off prostate stylet type IV, 71–88 µm long. Accessory stylets 40–42 µm and 42–48 µm long. Stylet ratios (see description): α = 52–59%, β = 55–67%, γ = 105–114%.</p>Published as part of <i>Artois, Tom, Willems, Wim, Reygel, Patrick & Schockaert, Ernest, 2013, Brachyrhynchus n. gen. n. sp., a new genus of Polycystididae Graff, 1905 (Rhabdocoela: Kalyptorhynchia), with the description of three new species from the Mediterranean and the Indian Ocean, pp. 127-136 in Zootaxa 3635 (2)</i> on pages 132-134, DOI: 10.11646/zootaxa.3635.2.3, <a href="http://zenodo.org/record/221128">http://zenodo.org/record/221128</a>
Replication Data for: Willems, E., Maes, B. & Walgrave, S. (2024) Mechanisms of political responsiveness: The information sources shaping elected representatives’ policy actions. Political Research Quarterly
No full textThis study examines the micro-level foundations of how policy responsiveness may come about. Our study builds on the assumption that elected officials’ information source use shapes their policy actions. We analyze the variation in information sources elected officials rely on for agenda-setting and policy formulation, distinguishing between public opinion sources, advocacy sources, and expert sources. Additionally, we examine how elected officials’ public opinion sources vary across individuals, parties, and political systems. Based on a 2015 survey with 345 Members of Parliament in Belgium and Canada, the results indicate that the actions of elected representatives are more affected by public opinion sources like citizens and the mass media when they initially prioritize issues for policy action, while interest groups are prominent in both stages, and parties and expert sources are more used in the policy formulation phase. Furthermore, politicians in majoritarian systems, those belonging to the opposition and members of populist parties, tend to rely more on public opinion sources than their peers in proportional systems, those in the majority and non-populist parties
Limipolycystis friedae Artois, Willems, Revis, Martens & Schockaert, 2012, n. sp.
No full textLimipolycystis friedae n. sp. Artois, Willems & Schockaert (Figs 3 A–D, 4 B) Holotype. A whole mount, France, Bay of Marseille, near Cap Morgiou, coarse-grained sand, 67 m deep, 7 October 1967 (SMNH Type- 8314). Paratypes. Three serially-sectioned specimens, from the type locality (HU 524–526). Etymology. Named after Frieda Boyen, wife of E. Schockaert. Diagnosis. Species of Limipolycystis with two eyes. Prostate vesicle of type III, rudimentary. Stylet an accessory stylet type II, 77 µm long, with a thickened proximal rim, which is wider than the tubular part, and a spirallyrunning ridge over whole of its length. Without gutter-like projection at the proximal stylet opening. Seminal receptacle a short and simple sclerotised tube, a little swollen near the bursa. Description. Specimens ± 0.6 mm long (measured on the whole mount), uncoloured, with two eyes (Fig. 3 A). Habitus and internal organization are almost identical to those of L. sicilicula n. sp.; the main differences between the two species are found in the construction of the stylet, the size of the prostate vesicle and in the morphology of the seminal receptacle. The stylet (Figs 3 B–C; 4 B) is 77 µm long. It has a thickened proximal rim, without a protrusion proximally from the stylet opening. The stylet shows a somewhat spirally-running, thickened ridge over whole of its length. At one side it is provided with some oblique folds, which follow the course of the external spirally-running muscles that surround the male atrium. The prostate vesicle is extremely reduced. It lies completely within the male atrium, next to the proximal opening of the stylet, and only contains eosinophilic secretion (Fig. 3 B: pv). The seminal receptacle (Fig. 3 D) consists of a sclerotised duct, which connects the proximal part of the oviduct with the bursa. It is a simple tube, without an interposed vesicle. Where it leaves the bursa, it is somewhat swollen and surrounded by circular muscles.Published as part of Artois, Tom, Willems, Wim, Revis, Nathalie, Martens, Paul & Schockaert, Ernest, 2012, New species of Limipolycystis Schilke, 1970 (Rhabdocoela: Kalyptorhynchia: Polycystididae) from the Western Mediterranean, pp. 26-36 in Zootaxa 3325 on page 31, DOI: 10.5281/zenodo.20953
Bewertung des Langzeitverlaufs nach Katheterablation von intermittierendem und persistierendem Vorhofflimmern mittels Tele-EKG: Prognostische und therapeutische Implikationen.
No full textDie durch bahnbrechende Studien von Haissaguerre et al. (Haissaguerre, Jais et al. 1998) initiierte elektrophysiologische Therapie mittels Hochfrequenzablation ist in den letzten Jahren fast zu einer Standardtherapie in der Behandlung des Vorhofflimmerns geworden.
Bei der Überwachung des Therapieerfolgs mittels Tele-EKG zeigten sich im Wesentlichen zwei Aspekte als besonders imponierend.
Zum Einen die Überlegenheit der täglichen Überwachung mit Hilfe des Tele-EKGs gegenüber einer herkömmlichen 12-Kanalableitung oder eines 24-Stunden-EKG.
Zum Anderen die eher schwache Korrelation von Symptom und objektiver Diagnose speziell bei Patienten, die im EKG Vorhofflimmern zeigten (Klemm, Ventura et al. 2006).
Mit vorliegender Arbeit konnte gezeigt werden, dass eine hohe Erfolgsrate sowohl für Patienten mit intermittierendem Vorhofflimmern, als auch für Patienten mit persistierendem Vorhofflimmern für die Pulmonalvenenisolation nachzuweisen ist.
Ebenso konnte der zusätzliche Nutzen einer Substratmodifikation bei Patienten mit persistierendem Vorhofflimmern aufgezeigt werden (Willems, Klemm et al. 2006). So ergab sich hier ein deutlicher Signifikanzunterschied von p=0,017 zu Gunsten der zusätzlich erzeugten Linien im linken Vorhof gegenüber der alleinigen Pulmonalvenenisolation. Insgesamt konnte hier eine Erfolgsrate von 68% erzielt werden.
Bei Patienten mit intermittierendem VHF konnte der zusätzliche Nutzen einer Substratmodifikation nicht nachgewiesen werden. Hier ergab sich kein Signifikanzunterschied (p=0,62).
Des Weiteren wurde der Frage nachgegangen, ob durch die Gabe eines ACE-Inhibitors respektive eines AT-1 Blockers das reverse Remodelling des Vorhofmyokards Unterstützung findet und wie dies zum Heilungserfolg beiträgt. Es konnte anhand von 214 Casematch-Patienten ein signifikanter Unterschied (p=0,019) in der Prognose dieser beiden, medikamentös unterschiedlich behandelten, Patientengruppen verdeutlicht werden.
Ein positiver Effekt von ACE-Inhibitoren und AT1-Blockern für Patienten mit persistierendem VHF nach Cardioversion konnte bereits nachgewiesen werden (Madrid, Bueno et al. 2002; Ueng, Tsai et al. 2003).
Das in der vorliegenden Arbeit untersuchte Patientenkollektiv scheint nun den Schluss zuzulassen, diese Erkenntnisse auch auf Patienten mit intermittierendem Vorhofflimmern ausweiten zu können
Limipolycystis libra Artois, Willems, Revis, Martens & Schockaert, 2012, n. sp.
No full text<i>Limipolycystis libra</i> n. sp. Artois, Willems & Schockaert <p>(Figs 3 E–F, 4A)</p> <p> <b>Holotype.</b> One whole mount, France, Corsica, bay of Calvi, sublittoral sand in front of main beach, 19 m deep, 9 April 1984 (SMNH Type-8315).</p> <p> <b>Other material.</b> Two whole mounts, France, Corsica, bay of Calvi, Stareso harbour, sand, 6 m deep, 4 April 1984 (HU V.2.46–47). One whole mount, France, Corsica, bay of Calvi, sand bank in front of Occelutia, 9–10 m deep, 16 May 1983 (HU V.2.48).</p> <p> <b>Etymology.</b> The species name refers to the construction of the stylet, with its opening approximately in the middle, making it somewhat resemble a balance. <i>Libra</i> (Lat.): weighing scale, balance.</p> <p> <b>Diagnosis.</b> Species of <i>Limipolycystis</i> with two eyes. Prostate vesicle of type III, well developed. Stylet an accessory stylet of type II, 68–74 µm long, consisting of a proximal plate-like part and distal tubular part, which are almost of equal length. Seminal receptacle consisting of a large, ellipsoid vesicle connected to a funnel-shaped sclerotised part.</p> <p> <b>Description.</b> Uncoloured animals with two eyes, 0.6–0.8 mm long (measured on whole mounts). As far as could be seen on the live animals and the whole mounts, habitus and internal organisation as in <i>Limipolycystis sicilicula</i> <b>n. sp.</b></p> <p> A large, sac-like seminal vesicle (Fig. 3 E: sv) opens in the most proximal part of the male atrium, close to the stylet. This stylet is 68–74 µm long (<i>x</i> = 72 µm; n = 4) and consists of two clearly distinguishable parts of almost equal length, with the opening of the stylet indicating the transition between both (opening indicated with an arrow in Figs 3 F, 4A). The distal part is a 36–39 µm-long (<i>x</i> = 37 µm; n = 4), slightly-curved tube tapering towards a pointed tip, whereas the proximal part is 32–38 µm long (<i>x</i> = 35 µm; n = 4), plate-like and more blunt. The prostate vesicle (Fig. 3 E: pv) bulges into the male atrium, close to the opening of the stylet. The accessory glands (Fig. 3 E: ag) form a spindle-shaped vesicle, from which a narrow duct curls around the proximal part of the stylet, entering it through the opening and running through its tubular part.</p> <p>A large, sperm-filled bursa (Fig. 3 E: b) bulges from the oviduct, close to the single, ovoid ovary. The seminal receptacle (Fig. 3 E: sr) consists of a large vesicle and a funnel-shaped hard part, the detailed construction of which should be checked on sections.</p>Published as part of <i>Artois, Tom, Willems, Wim, Revis, Nathalie, Martens, Paul & Schockaert, Ernest, 2012, New species of Limipolycystis Schilke, 1970 (Rhabdocoela: Kalyptorhynchia: Polycystididae) from the Western Mediterranean, pp. 26-36 in Zootaxa 3325</i> on pages 31-33, DOI: <a href="http://zenodo.org/record/209538">10.5281/zenodo.209538</a>
Austrorhynchus artoisi Willems, Sandberg & Jondelius, 2007, sp. nov.
No full textAustrorhynchus artoisi sp. nov. (Fig. 1 A–C) Localities. Loc. 2 and Loc. 4 (type locality). Material. Three individuals studied alive. Two whole mounts (one from each locality), one of them designated holotype (SMNH no. 7175). One serially-sectioned specimen (designated paratype; SMNH no. 7176). Etymology. Species dedicated to Prof. Dr Tom Artois (Hasselt University) for his contributions on polycystidid taxonomy and systematics, and for being a close friend and colleague to Ulf Jondelius and Wim Willems. Description. The animals are 0,9–1,4 mm long (measured on whole mounts), white to greyish, rather opaque and have no eyes. In all live individuals an almost round, bright yellow-orange egg (Fig. 1 A: x) was present (dimensions: 304 x 342 µm). The general organisation in the live animals (Fig. 1 A) is identical to that of other species of Austrorhynchus Karling, 1952 a. In one of the live individuals four pairs of proboscis retractors (Fig. 1 A: pr) could clearly be seen, whereas testes were not visible in the studied specimens. The only serially-sectioned individual is in bad shape, because the presence of an egg caused rupture of the central part of all sections. Quality is however sufficient to study the general structure of the proboscis, pharynx and the genital system, which is comparable to that in other species of Austrorhynchus (see Karling 1952 a; Artois & Schockaert 2003, 2005). The main differences with the other 16 known species of Austrorhynchus are found in the detailed structure of the two hard parts in the male genital system: prostate stylets type II and III (terminology of Artois & Schockaert 2003). The double-walled prostate stylet type II (Fig. 1 A: stII, 1 B) is 61–63 µm (n = 2, as for all following measurements for this species) long and consists of a very short proximal funnel and a distal tube (4 µm wide), of which the tip is slightly bent. The funnel-shaped part is 20,5–24 µm wide and its length is approximately 1 / 7 of the total length. The inner stylet is not restricted to the distal part of the outer stylet and even bulges out of the funnel proximally. The outer stylet does not carry any spines or hooks, but the funnel-shaped part is ornamented with a ring, which gives the proximal part of the stylet the shape of a stirrup. It is 28–31 µm wide and 21–28 µm long. The prostate stylet type III (Fig. 1 A: stIII, 1 C; A-organ in Karling 1977) closely resembles that of A. hawaiiensis Karling, 1977. The style and foot, which are 42–54 µm apart, are clearly recognisable, but unpronounced. They are interconnected by a narrow clasp (terminology of Willems et al., 2006 b) and a thin, comb-bearing plate, which is 21 µm at its broadest point. The clasp is strongly bent and situated very close to the thickened, proximal edge of the plate, giving the whole the appearance of an eight-shaped ring. The inconspicuous foot is situated at the base of a thread-like flagellum, which is 86–90 µm long (measured from the proximal rim of the foot). This flagellum shows a strong curve at ± 65 % of its length, but does not bear a comb nor is its distal end swollen. The most proximal third of the flagellum is not free, but connected to the plate. B B-C 50 Μm C pr x Diagnosis. Austrorhynchus artoisi sp. nov.: species of Austrorhynchus without eyes; double-walled stylet type II ca. 62 µm, consisting of a short proximal funnel, approximately 1 / 7 of the total length, and a distal tube with a bent tip; inner stylet is not restricted to distal part of outer stylet, which only carries a stirrup-shaped ornament proximally; stylet type III shows an unpronounced foot and stylet, ca. 48 µm apart; the foot tapers into a thread-like flagellum, which is ca. 88 µm long, bent and connected to a thin, comb-bearing plate. Discussion. Within the taxon Austrorhynchus, the 16 hitherto known species mainly differ in the detailed structure of the two prostate stylets. In A. artoisi sp. nov. both stylets show a combination of features, not present in any other species of Austrorhynchus. The stylet type II of A. artoisi has a very short funnel-shaped part, approximately 1 / 7 of the total stylet length. Only in A. karlingi Brunet, 1965 and A. scoparius Brunet, 1965 the basal tube is similarly short. The total length of the stylet is significantly larger (100–110 µm in A. karlingi and 80–100 µm in A. scoparius; see Brunet 1965). In most species of Austrorhynchus the stylet type II bears a hook, which is absent in A. artoisi and five more species (A. antarcticus Artois et al., 2000, A. galapagoensis Artois & Schockaert, 1999, A. pacificus Karling, 1977, A. pectatus Karling, 1952 a and A. scoparius; see Karling 1952 a, 1977; Brunet 1965; Artois & Schockaert 1999; Artois et al. 2000). Besides in A. artoisi, a distally bent stylet tube is only found in A. calcareus Karling, 1977 (see Karling 1952 a, 1977). Two features regarding the stylet type II are clearly unique for A. artoisi: presence of a stirrup-shaped ornament and the inner stylet that is as long as the outer stylet. Whereas type II stylets are rather simple in structure, stylets of type III are more complex, and especially in species of Austrorhynchus they show a great variety in shape and size. Apart from the one present in A. artoisi, there are only four species of Austrorhynchus with an annular type III stylet: A. californicus Karling, 1977, A galapagoensis, A. hawaiiensis and A. pacificus (see Karling 1977; Artois & Schockaert 1999; Willems et al. 2006). Of these A. galapagoensis clearly has an aberrant stylet, whereas in the other three the clasp (terminology of Willems et al. 2006) is not situated close to the plate, as is the case in A. artoisi. The reason for this is the presence of a more pronounced foot, in comparison with the situation in A. artoisi. Apart from the hard structures in the male genital system, there is yet another interesting feature distinguishing A. artoisi from most other species of Austrorhynchus, namely the absence of eyes. Besides in A. artoisi, they are only lacking in four other species: A. antarcticus, A. karlingi Brunet, 1965, A. magnificoides Artois et al., 2000 and A. magnificus Karling, 1952 a (see Karling 1952 a, 1977; Brunet 1965; Artois et al. 2000). This is the first record of a species of Austrorhynchus from the northern Atlantic region, and thus fills in the gap mentioned by Karling (1977: p. 159 and Fig. 9). Apart from the Mediterranean species (A. bruneti Karling, 1977, A. karlingi and A. scoparius), this is the only species of the taxon occurring in European waters. Most species of Austrorhynchus have a very limited distribution, in most cases they are only known from one locality. An exception is A. hawaiiensis, found on Hawaii, the East-African coast and the eastern Australian coast (Karling et al. 1972; Karling 1977; Willems et al. 2006 b)Published as part of Willems, Wim R., Sandberg, Maria I. & Jondelius, Ulf, 2007, First report on Rhabdocoela (Rhabditophora) from deep parts of Skagerrak, with the description of four new species, pp. 1-21 in Zootaxa 1616 on pages 4-6, DOI: 10.5281/zenodo.17910
- …
