19 Result(s)

Article

Aspects of the phylogeny of Platyhelminthes based on 18S ribosomal DNA and protonephridial ultrastructure

DNA studies of 23 taxa (20 platyhelminths, 1 nemertean, Homo and Artemia) and electron-microscopic studies of the protonephridia of many platyhelminths (supported by some additional ultrastructural data) have led...

K. Rohde, A. M. Johnson, P. R. Baverstock, N. A. Watson in Hydrobiologia (1995)

Article

Ultrastructure of spermiogenesis and spermatozoa ofNeopolystoma spratti (Platyhelminthes, Monogenea, Polystomatidae)

Spermiogenesis inNeopolystoma spratti conforms to the basic pattern found in polyopisthocotylean monogeneans and in Trematoda Digenea and Trematoda Aspidogastrea. The zone of differentiation exhibits a complete r...

N. A. Watson, K. Rohde in Parasitology Research (1995)

Chapter and Conference Paper

Aspects of the phylogeny of Platyhelminthes based on 18S ribosomal DNA and protonephridial ultrastructure

DNA studies of 23 taxa (20 platyhelminths, 1 nemertean, Homo and Artemia) and electron-microscopic studies of the protonephridia of many platyhelminths (supported by some additional ultrastructural data) have led...

K. Rohde, A. M. Johnson, P. R. Baverstock… in Biology of Turbellaria and some Related Fl… (1995)

Article

Two new sensory receptors inGyrodactylus sp. (Platyhelminthes, Monogenea, Monopisthocotylea)

Two pairs of sub-surface ciliary aggregations, not previously described in gyrodactylid monogeneans, have been found in the antero-dorsal region of adultGyrodactylus sp. One pair lies more anteriorly and has seve...

N. A. Watson, K. Rohde in Parasitology Research (1994)

Article

Ultrastructure of sperm and spermiogenesis ofPterastericola astropectinis (Platyhelminthes, Rhabdocoela, Pterastericolidae)

During development of the spermatid, two free flagella are transported distally from the main spermatid mass by elongation of the shaft. They rotate back towards the shaft and lie parallel with it prior to fus...

N. A. Watson, K. Rohde, U. Jondelius in Parasitology Research (1993)

Article

Ultrastructure of the protonephridial system of regenerating Stenostomum sp. (Plathelminthes, Catenulida)

The ultrastructure of the flame bulbs, protonephridial capillaries and duct of fully developed and regenerating Stenostomum sp. is described. Flame bulbs are formed by a single cell whose nucleus is located basal...

K. Rohde, N. A. Watson in Zoomorphology (1993)

Article

Mean values of subtemperatures over level surfaces of Green functions

N. A. Watson in Arkiv för Matematik (1992)

Article

Ultrastructure of sperm and spermatogenesis ofRugogaster hydrolagi, Schell 1973 (Platyhelminthes, Trematoda, Aspidogastrea, Rugogastridae)

Mature sperm ofRugogaster hydrolagi exhibit the structure typical of Trematoda, with 2 axonemes of the 9+“1” pattern being incorporated into the sperm body, dorsal and ventral microtubules occurring in the princi...

N. A. Watson, K. Rohde in Parasitology Research (1992)

Article

Ultrastructure of the develo** protonephridial system of the cercaria ofPhilophthalmus sp. (Trematoda, Digenea)

The fully developed flame bulb ofPhilopthalmus exhibits the structure characteristic of Trematoda and Monogenea: external and internal ribs forming a weir, external and internal leptotriches, and two longitudinal...

K. Rohde, N. A. Watson in Parasitology Research (1992)

Article

Ultrastructure of spermatogenesis and sperm ofMulticotyle purvisi (Plathelminthes, Aspidogastrea)

The ultrastructure of spermatogenesis is described for the first time in an aspidogastrean. The zone of differentiation which is usually formed during digenean spermiogenesis was not observed inMulticotyle purvis...

N. A. Watson, K. Rohde in Zoomorphology (1991)

Article

Secondary sensory receptor in a platyhelminth

K. Rohde, N. A. Watson, A. Lanfranchi in Naturwissenschaften (1991)

Article

Ultrastructure of pigmented photoreceptors of larvalMulticotyle purvisi (Trematoda, Aspidogastrea)

The two eyespots of larvalMulticotyle purvisi lie on the posterior of the brain dorsal to the pharynx. Each ocellus consists of one pigment cell and two rhabdomeres, one in the antero-lateral and one in the poste...

K. Rohde, N. A. Watson in Parasitology Research (1991)

Article

Inflammatory response and antigen localization following immunization with influenza virus ISCOMs

The inflammatory response, antigen retention, and antigen localization was studied in mice after immunization with influenza virus glycoproteins presented in two physically defined forms-micelles and ISCOMS (i...

D. L. Watson, K. Lövgren, N. A. Watson, C. Fossum, B. Morein, S. Höglund in Inflammation (1989)

Article

Hyperplane mean values of solutions of parabolic equations

We study the behaviour of certain hyperplane mean values of solutions of parabolic equations on an infinite strip, and use our results to prove a representation theorem for solutions which satisfy a one-sidedL ...

N. A. Watson in Rendiconti del Circolo Matematico di Palermo (1988)

Article

The weak maximum principle for parabolic differential inequalities

Nous établissons une form nouvelle du principe faible du maximum pour les solutions des inégalités différentielles du type parabolique.

N. A. Watson in Rendiconti del Circolo Matematico di Palermo (1983)

Article

Irregularity of boundary points in the Dirichlet problem for the heat equation

Viene studiato il comportamento al bordo di soluzioni del problema di Dirichlet per l'equazione del colore.

M. T. Barlow, N. A. Watson in Rendiconti del Circolo Matematico di Palermo (1982)

Article

Convexity of mean values of non-negative subtemperatures

N. A. Watson in Archive for Rational Mechanics and Analysis (1980)

Article

The rate of spatial decay of non-negative solutions of linear parabolic equations

N. A. Watson in Archive for Rational Mechanics and Analysis (1978)