197,357 research outputs found
Micrapion congoense STEFFAN 1948
No full text<i>Micrapion congoense</i> STEFFAN 1948 <p> <i>Micrapion congoense</i> n.sp.: STEFFAN 1948: 84 (key), 85 (descr., Democratic Republic of Congo).</p> <p> <i>Micrapion congoense</i> STEFFAN 1948: BOUČEK 1974: 214 (key), 217 (figs 261-263), 224 (tax. as <i>Micrapion congoenese</i>, Democratic Republic of Congo, Mozambique, Uganda).</p> <p>D i s t r i b u t i o n: Democratic Republic of Congo, Mozambique, Uganda.</p> <p>M a t e r i a l e x a m i n e d: Uganda: near Mubende 1 19.– 22.11.2001 leg. M. Snižek.</p>Published as part of <i>Madl, M., Schwarz, M. & K, Micrapion, 2012, Catalogue and faunistics of the family Leucospidae (Hymenoptera: Chalcidoidea) of the Ethiopian region exluding Malagasy subregion, pp. 1221-1235 in Linzer biologische Beiträge 44 (2)</i> on page 1230, DOI: <a href="http://zenodo.org/record/5329443">10.5281/zenodo.5329443</a>
Der Kaiser hat gerufen!
No full textfür Singstimme und Klavier von ernst Steffan ; Musikdruck , 2S. , Verlag von Dr. Alexander von Dorn und kais. Rat M. Pozsonyi, Wienfür Singstimme und Klavier von ernst Steffan ; Musikdruck , 2S. , Verlag von Dr. Alexander von Dorn und kais. Rat M. Pozsonyi, Wie
Scythropochroa trispinosa Steffan 1969
No full textScythropochroa trispinosa Steffan, 1969 (Fig. 18 A–D) Scythropochroa trispinosa Steffan, 1969 [Steffan, 1969: 682–685, fig. 6 a–f]. Material studied: Holotype: Male. 31.x.–4.xi.1964, Marshall Islands, Kwajalein Atoll, Carlson Island, Malaise trap, leg. B.D. Perkins (BPBM 8222). Conservation status: Body, head (without antennae), hypopygium and wings separated; wings under an isolated cover slip. The morphological details needed for determination are in rather good condition. Comments. The species is characterized by a 1-segmented palpus, short and broad wings with a long R 1, y with macrotrichia, R 5 along the whole length with both dorsal and ventral macrotrichia; veins of the M-fork very indistinct, Cu-stem long, mediotergite with 3-5 short bristles, fore tibia at the inner apex with an indistinct patch of bristles, gonostylus short and with 3 apical spines. The bristles on the mediotergite in connection with a 1-segmented palpus, long R 1 and an indifferent bristle patch on the apex of the fore tibia confirms that Steffan’s assignment of the species into the genus Scythropochroa is correct. Bristles on the mediotergite are a good character for the identification of species of this genus (Mohrig 2004). Distribution. Marshall Islands.Published as part of Broadley, Adam, Kauschke, Ellen & Mohrig, Werner, 2019, Revision of the black fungus gnat species (Diptera: Sciaridae) described by W. A. Steffan from Micronesia, pp. 215-241 in Zootaxa 4683 (2) on pages 236-238, DOI: 10.11646/zootaxa.4683.2.3, http://zenodo.org/record/377270
Diffusional effect in enzyme entrapping reactors
No full textThe industrial application of immobilized enzymes is discussed. A model composite membrane system is described which could permit correlation of the efficiency of bioconversion with its diffusion characteristics. The diffusion and permeation characteristics of β-galactosidase (from Escherichia coli) immobilized in pure cellulose membrane (mol. wt. 7000 and 13,000) are presented. In an actual industrial scale bioreactor, using fiber-entrapped enzymes, there will be effects, in addn. to diffusional ones, which may play an important role in detg. the efficiency of the reactor, e.g., the denaturation of the enzyme, its phys. loss, and possible inhibition reactions
Scythropochroa quadrispinosa Steffan 1969
No full textScythropochroa quadrispinosa Steffan, 1969 (Fig. 17 A–B) Scythropochroa quadrispinosa Steffan, 1969 [Steffan (1969): 682, fig. 5 a–e]. Material studied: Holotype: Male, 19.v.1957 (not 21.v. as given by Steffan), Caroline Islands, Palau Is., Babelth- uap I., Ngiwal, at light, leg. C.W. Sabrosky (USNMENT 2083267). Paratype: 1 male, same data as the holotype (BPBM, without registration number). Conservation status: Originally mounted in Hoyer’s medium and remounted in Euparal. Head, body, hypopygium and wings separated, wings under a separate cover slip on the same slide, destroyed. Thorax and hypopygium are depressed and deformed and the embedding medium turbid. Comments. The species is characterized by rather long flagellomeres, a 1-segmented palpus, an undifferentiated patch of bristles on the apex of the fore tibia, a large ovoid gonostylus with 4 hyaline spines on the inner side and a dense bristle area at the inner basal corner of the gonocoxites. It should be mentioned that 4 spines, arranged in two pairs, represent the typical armature of the gonostylus in the genus Cratyna, subgenus Cratyna s. str, within the subfamily Cratyninae. However, Shin et al. (2019) showed that the genus Scythropochroa (along with the genera Chaetosciara, Mouffetina and Schwenckfeldina) belongs to a new subfamily, the Chaetosciarinae, which differ from the Cratyninae by having a wing with a long R 1 that meets C at least (usually beyond) the base of the M-fork (in Cratyninae the R 1 is much shorter). As Steffan (1969) noted, the wings of the type specimens are destroyed or missing. It is therefore not possible to conclusively assign the species to either genus at present. Distribution. Caroline Islands: Palau Islands (Babelthuap Island). Also reported from Pagan Island (Northern Mariana Islands) by Evenhuis et al. (2010).Published as part of Broadley, Adam, Kauschke, Ellen & Mohrig, Werner, 2019, Revision of the black fungus gnat species (Diptera: Sciaridae) described by W. A. Steffan from Micronesia, pp. 215-241 in Zootaxa 4683 (2) on pages 235-236, DOI: 10.11646/zootaxa.4683.2.3, http://zenodo.org/record/377270
Corynoptera heterochela Steffan 1969
No full textCorynoptera heterochela Steffan, 1969 (Fig. 5 A–B, 6 A–E) Corynoptera heterochela Steffan, 1969 [Steffan (1969): 697 –699, fig. 11 a–j]. Material studied: Holotype: Male. 19.i.1953, Micronesia, Caroline Islands, Ponape I., Mt Temwetemwensekir, 180 m, light trap, leg. J.L. Gressitt (BPBM 8224). Paratypes: 3 males, same data as holotype (BPBM); 1 male, 1 female, 12.i.1953, Ponape Island, light trap, leg. J.L. Gressitt (male in PWMP). Conservation status: Body and head separated, both strongly deformed by dehydration of the Hoyer’s medium, air inclusion and turbidities. The paratypes are not so strongly deformed and allow a better interpretation of the morphological characters. Comments. The morphological details are difficult to interpret. We agree with Steffan that the species belongs to the genus Corynoptera by one bristle on the basal segment of the 3-segmented palpus, rather long bristles on the scutum, the wing venation and the shape and armature of the gonostylus with 4 strong apical spines, two more dorsally located. The teeth of the claws are not so typical for the genus and are similar to Corynoptera species from New Zealand (Mohrig & Jaschhof 1999). It could belong to the C. spinifera group according to Menzel & Mohrig (2000). Nevertheless, the taxonomic position of this species is not certain and another interpretation, different to the one given here, might be possible. Distribution. Caroline Islands (Pohnpei I.).Published as part of Broadley, Adam, Kauschke, Ellen & Mohrig, Werner, 2019, Revision of the black fungus gnat species (Diptera: Sciaridae) described by W. A. Steffan from Micronesia, pp. 215-241 in Zootaxa 4683 (2) on page 221, DOI: 10.11646/zootaxa.4683.2.3, http://zenodo.org/record/377270
A composite membrane bioreactor. Part II. Possible theoretical model
No full textAn attempt is made to work out a theor. model of the composite membrane bioreactor which, based on the diffusional characteristics of the system and of the kinetic properties of immobilized enzyme, would allow prediction of the efficiency of the system. A model is proposed, based on the thermodn. of the irreversible processes. The exptl. data on the biotransformation carried out in the composite membrane reactor are compared with the theor. ones suggested in the present paper
Scythropochroa gressitti Steffan 1969
No full textScythropochroa gressitti Steffan, 1969. (Fig. 16 A–D) [Steffan 1969: 680–682, fig. 4 a–f]. Material studied: Holotype: Female, 2.i.1953, Micronesia, Caroline Islands, Truk Is., Tol Island (Tol), Mt. Unibot, 390 m, leg. J. L. Gressitt (BPBM 8221). Conservation status: Embedded in Euparal. Body, head and wings separated; wings under a separate cover slip. The morphological details are in rather good condition. Comments. This medium-sized species is characterized by a large and club-shaped 1-segmented palpus, rather long flagellomeres, large wings with a long R 1, long R 5, macrotrichia on y and a few bristles on the mediotergite. The species appears similar to Scythropochroa latefurcata Enderlein from the Seychelles Islands however the relative lengths of the CuA-stem and fourth flagellomeres differ. Distribution. Micronesia (Caroline Islands).Published as part of Broadley, Adam, Kauschke, Ellen & Mohrig, Werner, 2019, Revision of the black fungus gnat species (Diptera: Sciaridae) described by W. A. Steffan from Micronesia, pp. 215-241 in Zootaxa 4683 (2) on page 234, DOI: 10.11646/zootaxa.4683.2.3, http://zenodo.org/record/377270
A composite membrane bioreactor. Part I. Physicochemical characterization
No full textIn order to investigate the influence of diffusion processes on the efficiency of bioconversion for systems employing enzymes immobilized by phys. entrapment within polymeric matrix vesicles, a composite membrane system model has been envisaged which, by enlarging the scale of the vesicle, allows correlations between efficiency of bioconversion and the diffusion characteristics of the system. The permeation coeffs. of the diffusive reactants have been evaluated as well as the 'apparent' Michaelis-Menten const. of the enzyme reaction
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