Search results for: Robin J. Smith

Items from 1 to 20 out of 21 results

article

Removal of extracellular coat from giant sperm in female receptacle induces sperm motility in Mytilocypris mytiloides (Cyprididae, Ostracoda, Crustacea)

Renate Matzke-Karasz, Robin J. Smith, Martin Heß

Cell and Tissue Research > 2017 > 368 > 1 > 171-186

Previous studies of cypridoidean ostracods have noted that (1) their giant spermatozoa are immotile inside the male, (2) these spermatozoa are motile in the female seminal receptacle and (3) these receptacles are often filled with empty sperm coats. Such findings have led previous authors to hypothesize that sperm must shed their coats in the female receptacle to become motile. We present light and...

article

Sperm length variations in five species of cypridoidean non-marine ostracods (Crustacea)

Robin J. Smith, Renate Matzke-Karasz, Takahiro Kamiya

Cell and Tissue Research > 2016 > 366 > 2 > 483-497

Spermatozoa of the ostracod superfamily Cypridoidea include some of the longest in the animal kingdom, but unlike other so-called giant spermatozoa, they are aflagellate, probably evolved only once, and represent an exceptionally old trait. Sperm length variations within cypridoidean species remain poorly known, a lack that hinders the development of hypotheses to explain their length and variation...

article

Sperm lengths of non‐marine cypridoidean ostracods (Crustacea)

Robin J. Smith, Renate Matzke‐Karasz, Takahiro Kamiya, Patrick De Deckker

Acta Zoologica > 97 > 1 > 1 - 17

Length measurements of sperms of 51 species of Cypridoidea ostracods were taken to supplement the paucity of ostracod sperm data in the published literature. The lengths of the posterior regions (carrying the mitochondria) and the thinner anterior regions were also measured when appropriate. Maximum lengths of sperms for individual species varied from 268 μm for Fabaeformiscandona velifera Smith and...

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The ontogeny of two species of Darwinuloidea (Ostracoda, Crustacea)

Robin J. Smith, Takahiro Kamiya

Zoologischer Anzeiger - A Journal of Comparative Zoology > 2008 > 247 > 4 > 275-302

The ontogeny of two species of the ostracod superfamily Darwinuloidea, Darwinula stevensoni (Brady and Robertson, 1870) and Vestalenula sp., is documented. The development of the appendages of the two species is very similar, with the exception of the antennule, which shows some variation. The general appearance of appendages during ontogeny of the two species is very similar to that of species of...

article

The organ on the first segment of the cypridoidean (Ostracoda, Crustacea) antennule: morphology and phylogenetic significance

Robin J. Smith, Renate Matzke-Karasz

Senckenbergiana lethaea > 2008 > 88 > 1 > 127-140

The antennule is the first appendage of ostracods and in the superfamily Cypridoidea is known to have two presumed chemical receptors, the y_a aesthetasc on the final segment and the Rome organ on the ventral side of the second moveable segment.Wouters (1999) was the first to document a third presumed chemical receptor on the antennule, the ‘new’ organ, on the dorsal side of the first segment in 11...

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Morphological analysis of the male carapace of the darwinulid ostracodeVestalenula cornelia Smith, Kamiya andHorne, 2006 (Crustacea)

Takahiro Kamiya, Yusuke Fujinami, Robin J. Smith

Senckenbergiana lethaea > 2008 > 88 > 1 > 113-119

The carapace of an adult male ofVestalenula Cornelia (a species of the putative ’ancient asexual’ darwinulid ostracode lineage) is compared with the carapaces of females and juveniles to determine differences in shape, size and distribution of pore patterns. While the overall shape and size of the male is similar to that of A-l juvenile females, and different to that of adult females, the pore pattern...

article

Copulatory behaviour and sexual morphology of three Fabaeformiscandona Krstić, 1972 (Candoninae, Ostracoda, Crustacea) species from Japan, including descriptions of two new species

Robin J. Smith, Takahiro Kamiya

Hydrobiologia > 2007 > 585 > 1 > 225-248

Two new species of Fabaeformiscandona and collections of Fabaeformiscandona japonica (Okubo, 1990. Bulletin Biogeography Society of Japan 45: 39–50) from Japan have provided an opportunity to study the copulatory behaviour and sexual morphology of these species. The male uses the large fifth limb palps to force open the female carapace for copulation. However, the female has an enlarged overlapping...

article

Six New Species of Fresh and Brackish Water Ostracods (Crustacea) from Yakushima, Southern Japan

Robin J. Smith, Takahiro Kamiya

Hydrobiologia > 2006 > 559 > 1 > 331-355

Twelve species of brackish and freshwater ostracods were collected from the island of Yakushima in southern Japan. Six species, belonging to the genera Cypria, Dolerocypris, Stenocypris, Schellencandona and Paracypria, are new and are described herein. The genus Schellencandona is reported for the first time outside Europe. Although a wide range of apparently suitable habitats was sampled for ostracods...

article

Evaluation of a new character for the phylogenetic analysis of Ostracoda (Crustacea): the podocopan maxillular branchial plate

Robin J. Smith, Takahiro Kamiya, David J. Horne, Akira Tsukagoshi

Zoologischer Anzeiger - A Journal of Comparative Zoology > 2005 > 243 > 3 > 139-153

A data set of the number of setae on the maxillular branchial plate of podocopan ostracods was compiled from published drawings and our own dissections. A total of 168 species in six superfamilies were covered, with the Cytheroidea, Cypridoidea and Bairdioidea being best represented. The number of setae is shown to be independent of the size of the ostracod and the environment in which the species...

article

The ontogeny of the entocytherid ostracod Uncinocythere occidentalis (Kozloff & Whitman, 1954) Hart, 1962 (Crustacea)

Robin J. Smith, Takahiro Kamiya

Hydrobiologia > 2005 > 538 > 1-3 > 217-229

The Entocytheridae is a cytheroidean family that is known for its commensal mode of life on other crustaceans. However, due to their small size and large sexual dimorphism in the sizes of the carapace, the ontogeny of the entocytherids is poorly understood. This paper documents the basic body plans and pore systems of the entocytherid Uncinocythere occidentalis (Kozloff & Whitman, 1954) Hart,...

article

The ontogeny of Loxoconcha japonica Ishizaki, 1968 (Cytheroidea, Ostracoda, Crustacea)

Robin J. Smith, Takahiro Kamiya

Hydrobiologia > 2003 > 490 > 1-3 > 31-52

The ontogeny of the cytheroidean species Loxoconcha japonica is documented from the earliest instar to the adult. The first instar (instar A-8) of L. japonica is different from that of cypridoidean species in that it has an additional appendage, the furca, present. From instar A-7 onwards, the appearance of the appendages is similar to that of cypridoidean and bairdioidean species. The furca is well...

article

The Ontogeny of Neonesidea oligodentata (Bairdioidea, Ostracoda, Crustacea)

Robin J. Smith, Takahiro Kamiya

Hydrobiologia > 2002 > 489 > 1-3 > 245-275

This is the first detailed ontogenetic study of the appendages and carapace of a bairdioidean ostracod. This paper uses the development of the appendages and changes in the pore systems of the carapace through ontogeny to help determine the relationship between the Bairdioidea and other podocope groups. Neonesidea oligodentata has eight post-embryonic stages: one fewer than the Cypridoidea, Cytheroidea...

article

Impact of attenuation correction on the accuracy of FDG-PET in patients with abdominal tumors: a free-response ROC analysis

Roland Hustinx, Ron J. Dolin, Franois Bnard, Anish Bhatnagar, more

European Journal of Nuclear Medicine and Molecular Imaging > 2000 > 27 > 9

Abstract. The aim of this study was to evaluate image quality and lesion detectability with and without attenuation correction in patients with abdominal tumors, using a free-response receiver operating characteristic (FROC) methodology. Thirty-four patients with various abdominal tumors were evaluated (11 men, 23 women, median age 48 years). Whole-body emission scans were performed 68min (35102min)...

article

Hemispheric Activation of Anterior and Inferior Prefrontal Cortex during Verbal Encoding and Recognition: A PET Study of Healthy Volunteers

J.Daniel Ragland, Ruben C. Gur, Mark G. Lazarev, Robin J. Smith, more

NeuroImage > 2000 > 11 > 6 > 624-633

Evidence of bilateral prefrontal activation during memory encoding and retrieval has increased attention given to anatomical subdivisions within the prefrontal cortex. The current study examined anterior and inferior aspects of the prefrontal cortex to determine their degree of functional and hemispheric overlap during encoding and recognition. Cerebral blood flow of 25 healthy volunteers was measured...

article

The morphology of the upper lip of Cypridoidea ostracods: taxonomic and phylogenetic significance

Robin J. Smith

Hydrobiologia > 2000 > 418 > 1 > 169-184

This paper represents the first study of the morphology of the upper lip (labrum) and hypostome of ostracods using scanning electron microscopy (S.E.M.). There is considerable variation in the upper lip morphology of the 23 species of Cypridoidea (Podocopina) ostracods used in this study. The detail of the upper lip morphology of each species is very distinctive, so that species determination can...

article

The ontogeny of the cypridid ostracod Eucypris virens (Jurine, 1820) (Crustacea, Ostracoda)

Robin J. Smith, Koen Martens

Hydrobiologia > 2000 > 419 > 1 > 31-63

The chaetotaxy (shape, structure and distribution of setae) of appendages and valve allometry during the post embryonic ontogeny of the cyprididine ostracod Eucypris virens are described. It is shown that the basic ontogenetic development of E. virens is very similar to that of other species of the family Cyprididae. During ontogeny, the chaetotaxy shows continual development on all podomeres of the...

article

Impact of attenuation correction on the accuracy of FDG-PET in patients with abdominal tumors: a free-response ROC analysis

Roland Hustinx, Ron J. Dolin, François Bénard, Anish Bhatnagar, more

European Journal of Nuclear Medicine and Molecular Imaging > 2000 > 27 > 9 > 1365-1371

. The aim of this study was to evaluate image quality and lesion detectability with and without attenuation correction in patients with abdominal tumors, using a free-response receiver operating characteristic (FROC) methodology. Thirty-four patients with various abdominal tumors were evaluated (11 men, 23 women, median age 48 years). Whole-body emission scans were performed 68 min (35–102 min) after...

article

Erratum: Impact of attenuation correction on the accuracy of FDG-PET in patients with abdominal tumors: a free-response ROC analysis

Roland Hustinx, Ron J. Dolin, François Bénard, Anish Bhatnagar, more

European Journal of Nuclear Medicine and Molecular Imaging > 2000 > 27 > 9 > 1435-1435

The online version of the original article can be found at http://dx.doi.org/10.1007/s002590000287

article

Can the standardized uptake value characterize primary brain tumors on FDG-PET?

Roland Hustinx, Robin J. Smith, Francois Benard, Anish Bhatnagar, more

European Journal of Nuclear Medicine and Molecular Imaging > 1999 > 26 > 11 > 1501-1509

Abstract. The aim of this study was to evaluate the usefulness of measuring the standardized uptake value (SUV) in primary brain tumors on fluorine-18 fluorodeoxyglucose (FDG) positron emission tomography (PET) scans. Two groups of patients were studied. Whole-brain glucose cerebral metabolic rates (wCMRs) and SUVs were obtained in 20 normal subjects. Twenty-seven patients with histology-proven malignant...

article

Dual time point fluorine-18 fluorodeoxyglucose positron emission tomography: a potential method to differentiate malignancy from inflammation and normal tissue in the head and neck

Roland Hustinx, Robin J. Smith, Francois Benard, David I. Rosenthal, more

European Journal of Nuclear Medicine and Molecular Imaging > 1999 > 26 > 10 > 1345-1348

Abstract. Fluorine-18 fluorodeoxyglucose (FDG) positron emission tomography (PET) studies imaging FDG PET imaging is used to detect and stage head and neck cancers. However, the variable physiologic uptake of FDG in different normal structures as well as at inflammatory sites may either obscure a tumor focus or be falsely interpreted to represent tumor activity. Twenty-one patients (9 men, 12 women,...

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Search results for: Robin J. Smith

Removal of extracellular coat from giant sperm in female receptacle induces sperm motility in Mytilocypris mytiloides (Cyprididae, Ostracoda, Crustacea)

Sperm length variations in five species of cypridoidean non-marine ostracods (Crustacea)

Sperm lengths of non‐marine cypridoidean ostracods (Crustacea)

The ontogeny of two species of Darwinuloidea (Ostracoda, Crustacea)

The organ on the first segment of the cypridoidean (Ostracoda, Crustacea) antennule: morphology and phylogenetic significance

Morphological analysis of the male carapace of the darwinulid ostracodeVestalenula cornelia Smith, Kamiya andHorne, 2006 (Crustacea)

Copulatory behaviour and sexual morphology of three Fabaeformiscandona Krstić, 1972 (Candoninae, Ostracoda, Crustacea) species from Japan, including descriptions of two new species

Six New Species of Fresh and Brackish Water Ostracods (Crustacea) from Yakushima, Southern Japan

Evaluation of a new character for the phylogenetic analysis of Ostracoda (Crustacea): the podocopan maxillular branchial plate

The ontogeny of the entocytherid ostracod Uncinocythere occidentalis (Kozloff & Whitman, 1954) Hart, 1962 (Crustacea)

The ontogeny of Loxoconcha japonica Ishizaki, 1968 (Cytheroidea, Ostracoda, Crustacea)

The Ontogeny of Neonesidea oligodentata (Bairdioidea, Ostracoda, Crustacea)

Impact of attenuation correction on the accuracy of FDG-PET in patients with abdominal tumors: a free-response ROC analysis

Hemispheric Activation of Anterior and Inferior Prefrontal Cortex during Verbal Encoding and Recognition: A PET Study of Healthy Volunteers

The morphology of the upper lip of Cypridoidea ostracods: taxonomic and phylogenetic significance

The ontogeny of the cypridid ostracod Eucypris virens (Jurine, 1820) (Crustacea, Ostracoda)

Impact of attenuation correction on the accuracy of FDG-PET in patients with abdominal tumors: a free-response ROC analysis

Erratum: Impact of attenuation correction on the accuracy of FDG-PET in patients with abdominal tumors: a free-response ROC analysis

Can the standardized uptake value characterize primary brain tumors on FDG-PET?

Dual time point fluorine-18 fluorodeoxyglucose positron emission tomography: a potential method to differentiate malignancy from inflammation and normal tissue in the head and neck

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