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Appalachia (Mesozoic)
During most of the Late Cretaceous (100.5 to 66 million years ago) the eastern half of North America formed Appalachia (named for the Appalachian Mountains), an island land mass separated from Laramidia to the west by the Western Interior Seaway. This seaway had split North America into two massive landmasses due to a multitude of factors such as tectonism and sea-level fluctuations for nearly 40 million years. seaway eventually exapanded, divided across the Dakotas, and by the end of the Cretaceous, it retreated towards the Gulf of Mexico and the Hudson Bay. This left the island masses joined in the continent of North America as the Rocky Mountains rose. From the Cenomanian to the end of the Campanian ages of the Late Cretaceous, Appalachia was separated from the rest of North America. As the Western Interior Seaway retreated in the Maastrichtian, Laramidia and Appalachia eventually connected. Because of this, its fauna was isolated, and developed very differently from the tyrannosaur, ceratopsian, hadrosaurid, pachycephalosaur and ankylosaurid dominated fauna of the western part of North America, known as "Laramidia". Due to the fact that Appalachia was largely flat and had less erosion compared to Laramidia, no terrestrially formed deposits have survived, with most dinosaur remains originating from seaborne carcasses that were transported into marine environments. Some sediments have been removed by glacial erosion during the last ice age, but it is difficult to ascertain how much sediment has been removed, or whether these sediments would have been any more productive than those that remain. Thus relatively little is known about Appalachia in comparison to Laramidia, with exception of plant life, marine life and the insects trapped in amber from New Jersey. In addition, due to a lack of interest in Appalachia, many fossils that have been found in Appalachia lie unstudied and remain in the inaccurate genera to which they were assigned in the days of E. D. Cope and O. C. Marsh. Only a few fossils of the terrestrial creatures that were found in this region have given us a brief glimpse into what life was like here during the Cretaceous period. However, the area has seen a bit of a resurgence of interest due to several discoveries made in the past few years. As mentioned earlier, not much is known about Appalachia, but some fossil sites, such as the Woodbine Formation, Navesink Formation, Ellisdale Fossil Site, Mooreville Chalk Formation, Demopolis Chalk Formation, Black Creek Group and the Niobrara Formation, together with ongoing research in the area, have given us a better look into this forgotten world of paleontology.
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  • 17 Oct 2022
Topic Review
GeneCards
GeneCards is a database of human genes that provides genomic, proteomic, transcriptomic, genetic and functional information on all known and predicted human genes. It is being developed and maintained by the Crown Human Genome Center at the Weizmann Institute of Science. The database aims at providing a quick overview of the current available biomedical information about the searched gene, including the human genes, the encoded proteins, and the relevant diseases. The GeneCards database provides access to free Web resources about more than 7000 all known human genes that integrated from >90 data resources, such as HGNC, Ensembl, and NCBI. The core gene list is based on approved gene symbols published by the HUGO Gene Nomenclature Committee (HGNC). The information is carefully gathered and selected from these databases by its engine. If the search does not return any results, this database will give several suggestions to help users accomplish their search depending on the type of query and offer direct links to other databases’ search engine. Over time, the GeneCards database has developed a suite of tools (GeneDecks, GeneLoc, GeneALaCart) that has more specialised capability. Since 1998, the GeneCards database has been widely used by bioinformatics, genomics and medical communities for more than 15 years.
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  • 17 Oct 2022
Topic Review
Marketing Information System
A marketing information system (MKIS) is a management information system (MIS) designed to support marketing decision making. Jobber (2007) defines it as a "system in which marketing data is formally gathered, stored, analysed and distributed to managers in accordance with their informational needs on a regular basis." In addition, the online business dictionary defines Marketing Information System (MKIS) as "a system that analyzes and assesses marketing information, gathered continuously from sources inside and outside an organization or a store." Furthermore, "an overall Marketing Information System can be defined as a set structure of procedures and methods for the regular, planned collection, analysis and presentation of information for use in making marketing decisions." (Kotler, at al, 2006)
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  • 17 Oct 2022
Topic Review
Security of Transport Layer Security
This article discusses the security of the Transport Layer Security (TLS) internet protocol.
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  • 17 Oct 2022
Topic Review
List of Photonics Equations
This article summarizes equations in the theory of photonics, including geometric optics, physical optics, radiometry, diffraction, and interferometry.
  • 535
  • 17 Oct 2022
Topic Review
9K111 Fagot
The 9K111 Fagot (Russian: Фагот; "bassoon") is a second-generation tube-launched SACLOS wire-guided anti-tank missile system of the Soviet Union for use from ground or vehicle mounts. The 9K111 Fagot missile system was developed by the Tula KBP Design Bureau for Instrument Building. "9M111" is the GRAU designation of the missile. Its NATO reporting name is AT-4 Spigot.
  • 6.3K
  • 21 Oct 2022
Topic Review
Timeline of Women's Suffrage in California
This timeline provides an overview of the political movement for women's suffrage in California. Women's suffrage became legal with the passage of Proposition 4 in 1911 yet not all women were enfranchised as a result of this legislation.
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  • 17 Oct 2022
Topic Review
Privatization in Australia
Privatization in Australia is the process of transiting a public service or good to the private sector through a variety of mechanisms that was commenced by the Federal Government in the 1990s, receiving bipartisan support. More generally, privatization is a set of economic policies that is part of a broader system of deregulation of government services, underpinned by the ideology of neoliberalism, in order to achieve economic outcomes of growth, efficiency and productivity. Some examples of sectors that have been privatized include finance, telecommunications and infrastructure. Australia's public service has also transformed with the introduction of New Public Management (NPM) in the late twentieth century which altered public administration models to appear more "business-like" through performance evaluations that emphasize efficiency, productivity and service delivery. Another definition of privatization is reliance on "more on private institutions and less on government, to satisfy people’s needs”. The concept of privatization can be construed in a narrow or broad sense. The narrow scope of privatization is portrayed as the sale of public goods, while the broader understanding of privatization involves the transfer of "ownership, management, finance and control" of public goods to private actors. Historically, the Australian government played an influential role in society as the idea of a strong state was prevalent to the Australian story since Federation. This changed in the twentieth-century, as Australia’s adoption of privatization as a set of government policies, reflected the rise of privatization across the Western world, specifically in the United States and United Kingdom. The Australian experience of privatization involves substituting government ownership, provision and funding to the private sector, in an attempt to liberalize the economy. The effectiveness of such policies is contested, as the motivations of privatization are widely debated.
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  • 17 Oct 2022
Topic Review
Void
Cosmic voids are vast spaces between filaments (the largest-scale structures in the universe), which contain very few or no galaxies. The cosmological evolution of the void regions differs drastically from the evolution of the Universe as a whole: there is a long stage when the curvature term dominates, which prevents the formation of galaxy clusters and massive galaxies. Hence, although even the emptiest regions of voids contain more than ~15% of the average matter density of the Universe, the voids look almost empty for an observer. Voids typically have a diameter of 10 to 100 megaparsecs (30 to 300 million light years); particularly large voids, defined by the absence of rich superclusters, are sometimes called supervoids. They were first discovered in 1978 in a pioneering study by Stephen Gregory and Laird A. Thompson at the Kitt Peak National Observatory. Voids are believed to have been formed by baryon acoustic oscillations in the Big Bang, collapses of mass followed by implosions of the compressed baryonic matter. Starting from initially small anisotropies from quantum fluctuations in the early universe, the anisotropies grew larger in scale over time. Regions of higher density collapsed more rapidly under gravity, eventually resulting in the large-scale, foam-like structure or "cosmic web" of voids and galaxy filaments seen today. Voids located in high-density environments are smaller than voids situated in low-density spaces of the universe. Voids appear to correlate with the observed temperature of the cosmic microwave background (CMB) because of the Sachs–Wolfe effect. Colder regions correlate with voids and hotter regions correlate with filaments because of gravitational redshifting. As the Sachs–Wolfe effect is only significant if the universe is dominated by radiation or dark energy, the existence of voids is significant in providing physical evidence for dark energy.
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  • 18 Oct 2022
Topic Review
Darkwing (Transformers)
Darkwing (sometimes called Darkwind or Blackwing) is a fictional character from the various Transformers series. He is a Decepticon jet.
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  • 17 Oct 2022
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