27 research outputs found
FIGURE 54. Ascarophis filiformis Polyanski, 1952. A in Guide to the Parasites of Fishes of Canada Part V: Nematoda
No full textFIGURE 54. Ascarophis filiformis Polyanski, 1952. A. male, anterior end, lateral view; B. male, posterior end, lateral view, arrow indicates left-hand pair 5 th and 6 th post-caudal papillae; C. female, posterior end, lateral view; D. egg from uterus. (Redrawn from Appy 1981
Dmitri S. Polysnski, Spokeman for Soviet Delegation Visiting Salt Lake City
No full textDmitri S. Polyanski is tasting honey, with S. K. Hampton of the Utah Honey Association (right) and A. D. Shveitser, Russian Interpreter (holding the honey)
Caudotestis Issaitschikow 1928
No full textGenus Caudotestis Issaitschikow, 1928 urn:lsid:zoobank.org:act:ACF01C 2 B- 6130 - 4 D 82 -BC 8 E-CC 55 DF 11 B 2 B 7 The status of the genus Caudotestis was discussed by Cribb (2005), who restricted it to four species from cold and deep waters. A further species has been described since. These species are: The type-species Caudotestis nicolli Issaitschikow, 1928, is known from Cottidae and Anarhichadidae, Kara Sea and off the eastern coast of Canada (Issaitschikow 1928; Bray 1979). Caudotestis opisthorchis (Polyanski, 1955) is known from Agonidae, Cottidae, Gadidae, Hemitripteridae, Hexagrammidae, Liparidae, Psychrolutidae and Sebastidae, Barents Sea, East Kamchatka, Chukotsk, Bering Sea, Sea of Okhotsk, off British Columbia, off West Greenland and off the eastern coast of Canada (Shulman & Shulman-Albova 1953; Polyanski 1955; Strelkov 1960; Zhukov 1963; Mamaev 1965; Arai 1967, 1969; Brinkmann 1975; Bray 1979; Machida & Araki 1992; Shvetsova 1992, 1994). Caudotestis kerguelensis (Prudhoe & Bray, 1973) is known from Channichthyidae, Congiopodidae and Nototheniidae, off Heard Island, Kerguelen, and the Macquarie Islands (Prudhoe & Bray 1973; Zdzitowiecki & Pisano 1996). Caudotestis glacialis (Zdzitowiecki, 1989) (syn. Stenakron sp. of Prudhoe & Bray 1973) is known from Artedidraconidae, Bathydraconidae and Liparidae, Davis Sea, Bransfield Strait and the Weddell Sea (Prudhoe & Bray 1973; Zdzitowiecki 1989, 1993, 1997 a, 1997 b, 2002 a, 2000 b). Caudotestis patagonensis Cantatore, Lancia, Lanfranchi & Timi, 2012 is known from Congiopodidae, Patagonian Shelf, Argentina (Cantatore et al. 2012).Published as part of Bray, R. A., Waeschenbach, A., Dyal, P., Littlewood, D. T. J. & Morand, S., 2014, New digeneans (Opecoelidae) from hydrothermal vent fishes in the south eastern Pacific Ocean, including one new genus and five new species, pp. 73-87 in Zootaxa 3768 (1) on page 80, DOI: 10.11646/zootaxa.3768.1.5, http://zenodo.org/record/28562
The microstructure and magnetic properties of the Fe-Cu-Nb-Si-B finemets with different copper content
No full textProtozoan parasites of fish
No full textStudies have been carried out on protozoan parasites of freshwater
fish from the Amazon region of Brazil, and the British Isles. Special
emphasis has been given to aspects of the taxonomy and life - history
of species of the order Myxosporida.
In section 1, full descriptions are given of Myxosporida from
Brazilian and British fish. The Brazilian species include three of the
genus Myxobolus from piranha (Serrasalmus sp, and S. rhombeus) and
tambaqui (Colossoma bidens), and Agarella gracilis
from lungfish
(Lepidosiren paradoxa). In British fish, Myxobolus species are described
from roach (Rutilus rutilus), gudgeon (Gobio gobio) and dace (Leuciscus
leuciscus); Myxidium species are described from roach, gudgeon and
salmon (Salmo salar).
The similarity of the genera Myxobolus and Myxosoma is noted, and
the difficulty of distinguishing them is pointed out. From the result
of histochemical tests for glycogen In spores of selected species, it
is proposed that the two genera should be synonymised as Myxobolus.
Accounts are given of attempts to establish infections of Myxidium
in Myxidium - free roach and salmon. The negative results of these
experiments suggests that myxosporidan spores may need to undergo some
form of further development outside the host before becoming infective
to a new host.
Check - lists are given of species of Myxobolus, Myxidium and,
recently described Myxosoma species.
In section 2, other protozoa, including two species of Microsporida,
one coccidian species, and Rhabdospora thelohani are described and
discussed
First measurement of target and beam-target asymmetries in the gamma p -< pi(0)eta p reaction
No full textThe first data on target and beam-target asymmetries for the gamma p -> pi(0)eta p reaction at photon energies from 1050 up to 1450 MeV are presented. The measurements were performed using the Crystal Ball and TAPS detector setup at the Glasgow tagged photon facility of the Mainz Microtron MAMI. The general assumption that the reaction is dominated by the Delta 3/2-amplitude is confirmed. The data are in particular sensitive to small contributions from other partial waves
Variations in the parasite fauna of the three-spined stickleback related to salinity and other parameters
No full textPhDAlthough the three-spined stickleback Gasterosteus
aculeatus L, is a common euryhaline fish, the salinity
tolerances of its parasites have not been studied. The
present survey was undertaken to remedy this. Sticklebacks
were caught at twenty-five freshwater, brackish
and marine sites in Southern England, Scotland and the
Isle of Man, and yielded thirty-two species of parasite.
As a result-of this field work, the effect of the
following parameters - geographical variation, seasonal
variation, sex of the host, speciation of the host,
parasite interdependence, length of the fish host and
salinity - on the parasite, fauna were analysed.
The salinity tolerance of a number of ectoparasites
was studied in detail, and the sodium ionic
content of intestinal fluid of starved and fed sticklebacks
in various salinities were measured.
As a result of all these studies, the parasites
were assigned to six salinity-range categories and a
comprehensive fauna list representing freshwater,
brackish water and marine water was built up
Measurement of π0 photoproduction on the proton at MAMI C
No full textDifferential cross sections for the γp→π0p reaction have been measured with the A2 tagged-photon facilities at the Mainz Microtron, MAMI C, up to the center-of-mass energy W=1.9GeV. The new results, obtained with a fine energy and angular binning, increase the existing quantity of π0 photoproduction data by ∼47%. Owing to the unprecedented statistical accuracy and the full angular coverage, the results are sensitive to high partial-wave amplitudes. This is demonstrated by the decomposition of the differential cross sections in terms of Legendre polynomials and by further comparison to model predictions. A new solution of the SAID partial-wave analysis obtained after adding the new data into the fit is presented
Aspects carbohydrate metabolism in the plerocercoid of Schistocephalus solidus.
No full textPhDThree spined sticklebacks infected with Schistocephalus solidus
plerocercoids were used for in-vivo experiments to determine the
relative distribution of 14C-labelled sugars (D-glucose and 3-0-M D-glucose) in fish and worm tissues.
A maximum of 23.6% labelled material from D-glucose was
found in plerocercoids after 4.5 hours and a maximum of 2.8%
labelled material from 3-0-M glucose after 24 hours. Comparison
of distribution levels between the two sugars and between infected
and uninfected fish tissues did not show significant differences
except in a few cases.
In-vitro studies with plerocercoids demonstrate D-glucose
uptake to be sodium dependent, saturable with an apparent Kt of
O.66mM, inversely related to dry weight and absorbed against a
concentration gradient. Uptake is also affected by temperature
with high rates at 200 and 400C and lower rates at 100 and 30°C.
Uptake is inhibited (non-competitively) by phlorizin and to
a lesser extent by ouabain and DNP. The nature of inhibition
caused by the latter two compounds was not determined.
THe effect of 3-O-M glucose on D-glucose uptake was
inconclusive. Similarly the effect of D-galactose was inconclusive
and also inconsistent,causing both stimulation and inhibition of
D-glucose uptake.
A gradient of glucose absorption is present along the length
of the plerocercoid; the lowest rate being found at the anterior
section and the highest at the posterior end.
Plerocercoids incubated under aerobic conditions in 14C-D-glucose
produced insignificant amounts of labelled CO2.
Under aerobic conditions lactate is produced by plerocercoids at
the rate of O.13mg/ml/hour but no detectable amounts of pyruvate
were found under similar conditions.
Glycogen extracts from plerocercoids incubated in-vivo
contain increasing levels of 14C-labelled material with increased
incubation periods.
Host metabolism is significantly affected by the presence
of plerocercoids. Lower levels of glycogen are found in the liver
tissue of infected fish compared to uninfected fish. Also the rate
of D-glucose uptake by fish stomach and intestinal tissues is
considerably reduced in infected fish
