We consider the Thompson-Stein group F (n1, ..., nk) where n1, ..., nk ∈ {2, 3, 4, ...}, k ∈ N. We highlight several differences between the cases k = 1 and k > 1, including the fact that minimal tree-pair diagram representatives of elements may not be unique when k > 1. We establish how to find minimal tree-pair diagram representatives of elements of F (n1, ..., nk), and we prove several theor...

Since the introduction by Walsh12 in 1955 of atomic absorption spectrophtometry as an analytical method, it has found application in many fields as a means of rapid analysis of certain metallic elements at very low concentrations. The analysis of agricultural materials, i.e., leaves, soil extracts and fertilizers is one sphere in which atomic absorption has been applied by several workers1, 2, ...

Unlike most animal tissue networks, the patterns of vein networks in plant leaves are variable and plastic, suggesting distinct control mechanisms. Thus, knowledge of the gene regulatory circuits that pattern leaf vein networks could suggest new control mechanisms of tissue network formation. However, the cis-regulatory elements required for expression at early stages of vein development are la...

Levels of sodium, potassium, calcium and magnesium were determined in plant organs (bud, flowers, fruit, seed, leaves, stems, roots, cobs, styles, shaft, grains and efflorescences) of three Fadama farms located in Ifaki-Ekiti, Ado-Ekiti and Ikere-Ekiti of Ekiti State, Nigeria. The highest levels of Mg, K, Na and Ca were obtained in the bud of Hibiscus esculentus with respective values (ppm dry ...

DNA transposons are mobile elements with the ability to mobilize and transport genetic information between different chromosomal loci. Unfortunately, most transposons copies are currently inactivated, little is known about mariner elements in humans despite their role in the evolution of the human genome, even though the Hsmar2 transposon is associated to hotspots for homologous recombination i...

Arbuscular mycorrhizal symbiosis is an ancient interaction between plants and fungi of the phylum Glomeromycota. In exchange for photosynthetically fixed carbon, the fungus provides the plant host with greater access to soil nutrients via an extensive network of root-external hyphae. Here, to determine the impact of the symbiosis on the host ionome, the concentration of nineteen elements was de...

There are some types of nature elements that are adequately represented in Computer Graphics only through volumes. In order to visualize scenes with volumes, together with geometrical objects, it is necessary to make use of a hybrid rendering algorithm. However, the presence of volumetric elements heavily increases the visualization processing time, independently of the technique being used. Th...

The understanding of the influence of toxic elements on root anatomy and element distribution is still limited. This study describes anatomical responses, metal accumulation and element distribution of rooted cuttings of Salix caprea after exposure to Cd and/or Zn. Differences in the development of apoplastic barriers and tissue organization in roots between two distinct S. caprea isolates with...

Highly detailed natural scenes and objects tend to be perceived as being realistic, while repeated parts and patterns decrease their realism. To avoid scenes with noticeable repeated elements, we introduce the notion of ’more of the same’, which focuses on the task of generating additional similar instances from a small set of exemplars. The small number of exemplars, as well as their diversity...

The ocs-elements comprise a family of related 20-base pair DNA sequences with dyad symmetry that are functional components of the promoters of severa1 genes introduced into the plant nucleus by Agrobacterium transformation or infection by DNA viruses. We describe the isolation and characterization of a maize cDNA that encodes a protein, OCSBF-1, that binds specifically to ocs-element sequences....