17 Result(s)

Article

Stability of Kerogen Classification with Regard to Image Segmentation

This paper investigates the stability of an automatic system for classifying kerogen material from images of sieved rock samples. The system comprises four stages: image acquisition, background removal, segmen...

J. J. Charles, L. I. Kuncheva, B. Wells, I. S. Lim in Mathematical Geosciences (2009)

Article

Automated Kerogen Classification in Microscope Images of Dispersed Kerogen Preparation

We develop the classification part of a system that analyses transmitted light microscope images of dispersed kerogen preparation. The system automatically extracts kerogen pieces from the image and labels eac...

L. I. Kuncheva, J. J. Charles, N. Miles, A. Collins, B. Wells… in Mathematical Geosciences (2008)

Chapter and Conference Paper

An Evaluation Measure of Image Segmentation Based on Object Centres

Classification of organic materials obtained from rock and drill cuttings involves finding multiple objects in the image. This task is usually approached by segmentation. The quality of segmentation is evaluat...

J. J. Charles, L. I. Kuncheva, B. Wells, I. S. Lim in Image Analysis and Recognition (2006)

Article

Coherence–incoherence and dimensional crossover in layered strongly correlated metals

The properties of an interacting electron system depend on the electron correlations and the effective dimensionality. For example, Coulomb repulsion between electrons may inhibit, or completely block, conduct...

T. Valla, P. D. Johnson, Z. Yusof, B. Wells, Q. Li, S. M. Loureiro, R. J. Cava… in Nature (2002)

Article

Imaging bacterial polysaccharides by AFM

Atomic force microscopy has been used to image the bacterial polysaccharides xanthan, acetan and gellan. Images were obtained under constant force conditions in a liquid cell. Drops of dilute solutions of the ...

A. P. Gunning, A. R. Kirby, V. J. Morris, B. Wells, B. E. Brooker in Polymer Bulletin (1995)

Article

The cell wall of the chlamydomonad flagellate,Gloeomonas kupfferi (Volvocales, Chlorophyta)

The large unicellular flagellate,Gloeomonas kupfferi, has recently been used as an important tool in chlamydomonad cell biology research, especially in studies dealing with the structure and function of the endom...

D. S. Domozych, B. Wells, P. J. Shaw in Protoplasma (1992)

Article

Scale biogenesis in the green alga,Mesostigma viride

The unicellular green algal flagellate,Mesostigma viride, is characterized by an extracellular matrix of multiple layers of scales. These scales are processed within the Golgi apparatus (GA). The GA consists of 1...

D. S. Domozych, B. Wells, P. J. Shaw in Protoplasma (1992)

Article

Immunoassay and ultrastructural localization of isopentenyladenine and related cytokinins using monoclonal antibodies

Two hybridoma cell lines, J40-IV-A1 and J40-IV-C4 were obtained from a fusion of spleen cells of Balb/c mice immunized against an isopentenyladenosine-bovine serum albumin conjugate with X63. Ag 8.653 myeloma ...

J. Eberle, T. L. Wang, S. Cook, B. Wells, E. W. Weiler in Planta (1987)

Chapter

The Nodulation Genes of Rhizobium Leguminosarum

In the R. leguminosarum plasmid pRL1JI, Tn5-induced nod alleles were located between two clusters of fix alleles (Downie et al. 1983a). DNA from one fix region was homologous to the K. pneumonia ...

J. A. Downie, Q-S. Ma, B. Wells, C. D. Knight… in Advances in Nitrogen Fixation Research (1984)

Article

Intranuclear fibrillar material in cereal pollen mother cells

Ultrastructural studies of cereal anthers found intranuclear bundles of microfilaments in pollen mother cells (PMCs) but not elsewhere. The ultrastructure, distribution, and behaviour of this fibrillar materia...

M. D. Bennett, J. B. Smith, S. Simpson, B. Wells in Chromosoma (1979)

Article

Deformed lateral elements in synaptonemal complexes of Phaedranassa viridiflora

An electron microscopical study was made of an intermittent structural deformity in the lateral elements of synaptonemal complexes in pollen mother cells during zygotene of diploid and triploid forms of Phaedrana...

L. F. La Cour, B. Wells in Chromosoma (1973)

Article

Abnormalities in synaptonemal complexes in pollen mother cells of a lily hybrid

Two abnormalities, one in lateral elements of synaptonemal complexes the other involving whole complexes, have been studied with the electron microscope in pollen mother cells of the lily hybrid, Lilium aureliens...

L. F. La Cour, B. Wells in Chromosoma (1973)

Article

The nuclear pores of early meiotic prophase nuclei of plants

Pollen mother cells at early meiotic prophase fromFritillaria lanceolata, F. mutica, Tulbaghia violacea, the lily “Formobel”,Triticum aegilopoides, T. dicoccoides, T. aestivum and synaptic and asynaptic forms ofT...

L. F. La Cour, B. Wells in Zeitschrift für Zellforschung und Mikroskopische Anatomie (1971)

Article

Meiotic prophase in anthers of asynaptic wheat

The light microscope showed that zygotene and pachytene were completely suppressed in pollen mother cells of an asynaptic mutant of Triticum durum; the chromosomes passed through a normal chromomeral leptotene co...

L. F. La Cour, B. Wells in Chromosoma (1970)

Article

The origin of fibrillar particles sometimes seen in plant nucleoli

1. When osmic acid was used as the fixative, dense particles ranging in size between 75 and 310 Å which were com...

L. F. La Cour, B. Wells in Zeitschrift für Zellforschung und Mikroskopische Anatomie (1969)

Article

The loops and ultrastructure of the nucleolus of Ipheion uniflorum

1. The nucleolus of Ipheion uniflorum was studied in root tips and endosperm in respect of structure of internal...

L. F. La Cour, B. Wells in Zeitschrift für Zellforschung und Mikroskopische Anatomie (1967)