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Mary Gordon Calder
Mary Gordon Calder (c. 1906–1992) was a Scottish paleobotanist. She is known for her work on Carboniferous fossil plants and Jurassic conifers. Early years Mary Gordon Calder was born in Uddingston, South Lanarkshire, Scotland to William Calder, a general manager of a warehouse. She contracted poliomyelitis as a child, requiring her to wear leg braces for the rest of her life. Life in Glasgow Calder was interested in biological and chemical sciences, and at the age of 18, she entered the University of Glasgow to study botany. Her mother, a reputedly passionate amateur botanist, may have influenced her in this. She graduated in 1929 with honours and went on to work as a researcher in Glasgow. She first pursued her doctorate under James Montagu Frank Drummond (not to be confused with the Australian botanist James Drummond), the then Regius Professor of Botany in the University of Glasgow. Her first paper was about tomatoes, a choice influenced by Drummond. However, it was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Uddingston
Uddingston ( sco, Uddinstoun, gd, Baile Udain) is a small town in South Lanarkshire, Scotland. It is on the north side of the River Clyde, south-east of Glasgow city centre, and acts as a dormitory suburb for the city. Geography and boundaries Uddingston is located to the south-east of Glasgow city centre and approximately east of the Glasgow City Council boundary (ending at the former Glasgow Zoo at Broomhouse - part of Baillieston). It is bounded to the south-west by the River Clyde as it flows north-west towards Glasgow, separating Uddingston, along with some woodland, from the neighbouring towns of Blantyre to the south and Cambuslang to the west. As such, the Clyde Walkway and National Cycle Route 75 both traverse the town. The nearest settlement to Uddingston is the large village of Bothwell, almost contiguous to the south-east; the two main streets are apart. The village of Uddingston, which is contained exclusively within the boundaries of South Lanarkshire, hous ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orthotics
Orthotics ( el, Ορθός, translit=ortho, lit=to straighten, to align) is a medical specialty that focuses on the design and application of orthoses, or braces. An is "an externally applied device used to influence the structural and functional characteristics of the Neuromuscular junction, neuromuscular and Skeletal muscle, skeletal system". Orthotists are professionals who specialize in the provision of orthoses. Classification Orthotic devices are classified into four areas of the body according to the international classification system (ICS): orthotics of the Human leg, lower extremities, orthotics of the Upper limb, upper extremities, orthotics for the Torso, trunk, and orthotics for the head. Orthoses are also classified by function: paralysis orthoses, relief orthoses, and soft braces. Under the International standard, International Standard terminology, orthoses are classified by an acronym describing the anatomical joints which they contain. For example, a knee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spermatophyte
A spermatophyte (; ), also known as phanerogam (taxon Phanerogamae) or phaenogam (taxon Phaenogamae), is any plant that produces seeds, hence the alternative name seed plant. Spermatophytes are a subset of the embryophytes or land plants. They include most familiar types of plants, including all flowers and most trees, but exclude some other types of plants such as ferns, mosses, algae. The term ''phanerogams'' or ''phanerogamae'' is derived from the Greek (), meaning "visible", in contrast to the cryptogamae (), together with the suffix (), meaning "to marry". These terms distinguished those plants with hidden sexual organs (cryptogamae) from those with visible sexual organs (phanerogamae). Description The extant spermatophytes form five divisions, the first four of which are traditionally grouped as gymnosperms, plants that have unenclosed, "naked seeds": * Cycadophyta, the cycads, a subtropical and tropical group of plants, * Ginkgophyta, which includes a single living s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cellulose Peel Technique
Cellulose is an organic compound with the formula , a polysaccharide consisting of a linear chain of several hundred to many thousands of β(1→4) linked D-glucose units. Cellulose is an important structural component of the primary cell wall of green plants, many forms of algae and the oomycetes. Some species of bacteria secrete it to form biofilms. Cellulose is the most abundant organic polymer on Earth. The cellulose content of cotton fiber is 90%, that of wood is 40–50%, and that of dried hemp is approximately 57%. Cellulose is mainly used to produce paperboard and paper. Smaller quantities are converted into a wide variety of derivative products such as cellophane and rayon. Conversion of cellulose from energy crops into biofuels such as cellulosic ethanol is under development as a renewable fuel source. Cellulose for industrial use is mainly obtained from wood pulp and cotton. Some animals, particularly ruminants and termites, can digest cellulose with the help of sym ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pteridosperm
The term Pteridospermatophyta (or "seed ferns" or "Pteridospermatopsida") is a polyphyletic group of extinct seed-bearing plants (spermatophytes). The earliest fossil evidence for plants of this type is the genus ''Elkinsia'' of the late Devonian age. They flourished particularly during the Carboniferous and Permian periods. Pteridosperms declined during the Mesozoic Era and had mostly disappeared by the end of the Cretaceous Period, though some pteridosperm-like plants seem to have survived into Eocene times, based on fossil finds in Tasmania. With regard to the enduring utility of this division, many palaeobotanists still use the pteridosperm grouping in an informal sense to refer to the seed plants that are not angiosperms, coniferoids (conifers or cordaites), ginkgophytes or cycadophytes (cycads or bennettites). This is particularly useful for extinct seed plant groups whose systematic relationships remain speculative, as they can be classified as pteridosperms with no va ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Petrified
In geology, petrifaction or petrification () is the process by which organic material becomes a fossil through the replacement of the original material and the filling of the original pore spaces with minerals. Petrified wood typifies this process, but all organisms, from bacteria to vertebrates, can become petrified (although harder, more durable matter such as bone, beaks, and shells survive the process better than softer remains such as muscle tissue, feathers, or skin). Petrifaction takes place through a combination of two similar processes: permineralization and replacement. These processes create replicas of the original specimen that are similar down to the microscopic level. Processes Permineralization One of the processes involved in petrifaction is permineralization. The fossils created through this process tend to contain a large amount of the original material of the specimen. This process occurs when groundwater containing dissolved minerals (most commonly q ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lycopod
Lycopodiopsida is a class of vascular plants known as lycopods, lycophytes or other terms including the component lyco-. Members of the class are also called clubmosses, firmosses, spikemosses and quillworts. They have dichotomously branching stems bearing simple leaves called microphylls and reproduce by means of spores borne in sporangia on the sides of the stems at the bases of the leaves. Although living species are small, during the Carboniferous, extinct tree-like forms formed huge forests that dominated the landscape and contributed to coal deposits. The nomenclature and classification of plants with microphylls varies substantially among authors. A consensus classification for extant (living) species was produced in 2016 by the Pteridophyte Phylogeny Group (PPG I), which places them all in the class Lycopodiopsida, which includes the classes Isoetopsida and Selaginellopsida used in other systems. (See Table 2.) Alternative classification systems have used ranks fro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lycopodiophyta
The lycophytes, when broadly circumscribed, are a vascular plant (tracheophyte) subgroup of the kingdom Plantae. They are sometimes placed in a division Lycopodiophyta or Lycophyta or in a subdivision Lycopodiophytina. They are one of the oldest lineages of extant (living) vascular plants; the group contains extinct plants that have been dated from the Silurian (ca. 425 million years ago). Lycophytes were some of the dominating plant species of the Carboniferous period, and included tree-like species, although extant lycophytes are relatively small plants. The scientific names and the informal English names used for this group of plants are ambiguous. For example, "Lycopodiophyta" and the shorter "Lycophyta" as well as the informal "lycophyte" may be used to include the extinct zosterophylls or to exclude them. Description Lycophytes reproduce by spores and have alternation of generations in which (like other vascular plants) the sporophyte generation is dominant. Some lycophyte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isoetopsida
Lycopodiopsida is a class of vascular plants known as lycopods, lycophytes or other terms including the component lyco-. Members of the class are also called clubmosses, firmosses, spikemosses and quillworts. They have dichotomously branching stems bearing simple leaves called microphylls and reproduce by means of spores borne in sporangia on the sides of the stems at the bases of the leaves. Although living species are small, during the Carboniferous, extinct tree-like forms formed huge forests that dominated the landscape and contributed to coal deposits. The nomenclature and classification of plants with microphylls varies substantially among authors. A consensus classification for extant (living) species was produced in 2016 by the Pteridophyte Phylogeny Group (PPG I), which places them all in the class Lycopodiopsida, which includes the classes Isoetopsida and Selaginellopsida used in other systems. (See Table 2.) Alternative classification systems have used ranks fro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scale Tree
Lepidodendrales (from the Greek for "scale tree") were primitive, vascular, heterosporous, arborescent (tree-like) plants related to present day lycopsids. Members of Lepidodendrales are the best understood of the fossil lycopsids due to the vast diversity of Lepidodendrales specimens and the diversity in which they were preserved; the extensive distribution of Lepidodendrales specimens as well as their well-preservedness lends paleobotanists exceptionally detailed knowledge of the coal-swamp giants’ reproductive biology, vegetative development, and role in their paleoecosystem. The defining characteristics of the Lepidodendrales are their secondary xylem, extensive periderm development, three-zoned cortex, rootlike appendages known as stigmarian rootlets arranged in a spiralling pattern, and megasporangium each containing a single functional megaspore that germinates inside the sporangium. Many of these different plant organs have been assigned both generic and specific names as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Robert Kidston
Dr Robert Kidston, Fellow of the Royal Society, FRS FRSE LLD (29 June 1852 – 13 July 1924) was a Scottish botanist and palaeobotanist. Life He was born in Bishopton House in Renfrewshire on 29 June 1852 the youngest of twelve children of Robert Alexander Kidston, a Glasgow businessman, and his wife, Mary Anne Meigh. He was educated at the High School in Stirling. He studied botany at the University of Edinburgh and later studied the Rhynie chert and worked for the British Geological Survey. Kidston was "arguably the best and most influential palaeobotanist of his day. In over 180 scientific papers he laid the foundations for a modern understanding of the taxonomy and palaeobiology of Devonian and Carboniferous plants." The Prime Minister Bonar Law was his first cousin. In the 1880s Kidston was asked to catalogue the Palaeozoic plant collection of the British Museum (Natural History). This work began in February 1883, and was completed in 1886. In 1886, he was elected a Fe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coal Ball
A coal ball is a type of concretion, varying in shape from an imperfect sphere to a flat-lying, irregular slab. Coal balls were formed in Carboniferous Period swamps and mires, when peat was prevented from being turned into coal by the high amount of calcite surrounding the peat; the calcite caused it to be turned into stone instead. As such, despite not actually being made of coal, the coal ball owes its name to its similar origins as well as its similar shape with actual coal. Coal balls often preserve a remarkable record of the microscopic tissue structure of Carboniferous swamp and mire plants, which would otherwise have been completely destroyed. Their unique preservation of Carboniferous plants makes them valuable to scientists, who cut and peel the coal balls to research the geological past. In 1855, two English scientists, Joseph Dalton Hooker and Edward William Binney, made the first scientific description of coal balls in England, and the initial research on coal b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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