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Topic Review
Tricuspid Atresia
Tricuspid atresia (TA) is a cyanotic, congenital heart defect (CHD) and is defined as congenital absence or agenesis of the morphologic tricuspid valve. It is the third most common cyanotic CHD, and is the most common cause of cyanosis with left ventricular hypertrophy. The prevalence of TA is estimated to be 2.9% of autopsy cases and 1.4% to 1.5% of the clinical cases of CHD.
  • 4.8K
  • 20 Oct 2021
Topic Review
Influence of Technologies on Sustainable Tourism
This study’s objective is to provide an overview on literature state-of-the-art related to sustainable tourism and technological innovations, offering insights for further advancing this domain. We employ a bibliometric analysis and a comprehensive review of 139 articles, collected from Web of Science and Scopus databases, for the purpose of: (i) exploring and discussing the most relevant contributions in the publication network: (ii) highlighting key issues and emerging topics; (iii) uncovering open questions for the future. Our findings reveal contradictory views on the risks and benefits of technology adoption. Artificial intelligence, internet of things, circular economy, big data, augmented and virtual reality emerge as major trends. Five work streams are identified and described, leading to a broader perspective on how technology can shape the future of sustainable tourism. Relevant theoretical and managerial implications are derived. Finally, a research agenda is proposed as guidance for future studies addressing the outcomes of digital disruption on sustainable tourism.
  • 4.8K
  • 29 Nov 2021
Topic Review Video
Plastic Waste Governance in Bangladesh
Plastic, an offer of modernity, is presenting a massive threat in altered forms, to our health and environment. Plastic does not only pollute the surface environment, fresh water, and marine ecosystems, but toxic elements released from plastics also percolate down the surface and contaminate groundwater, which we often use as ‘safe’ drinking water. This probable future risk is deeply rooted in the entire governance infrastructure of plastic waste which could potentially lead to contamination of groundwater. A recent study finds 81% of tap water samples collected worldwide contained plastic pollutants, which means that annually we may be ingesting between 3000 and 4000 microparticles of plastic from tap water.
  • 4.8K
  • 04 Mar 2022
Topic Review
Surface Plasmon Resonance Based Biosensors
Over the years, biosensors have acquired increasing importance in a wide range of applications due to synergistic studies of various scientific disciplines, determining their great commercial potential and revealing how nanotechnology and biotechnology can be strictly connected. In the present scenario, biosensors have increased their detection limit and sensitivity unthinkable until a few years ago. The most widely used biosensors are optical-based devices such as surface plasmon resonance (SPR)-based biosensors and fluorescence-based biosensors.
  • 4.8K
  • 23 Feb 2021
Topic Review
Dilophosaurus
Dilophosaurus (/daɪˌloʊfəˈsɔːrəs, -foʊ-/ dy-LOH-fə-SOR-əs, -⁠foh-) is a genus of theropod dinosaurs that lived in what is now North America during the Early Jurassic, about 193 million years ago. Three skeletons were discovered in northern Arizona in 1940, and the two best preserved were collected in 1942. The most complete specimen became the holotype of a new species in the genus Megalosaurus, named M. wetherilli by Samuel P. Welles in 1954. Welles found a larger skeleton belonging to the same species in 1964. Realizing it bore crests on its skull, he assigned the species to the new genus Dilophosaurus in 1970, as Dilophosaurus wetherilli. The genus name means "two-crested lizard", and the species name honors John Wetherill, a Navajo councilor. Further specimens have since been found, including an infant. Footprints have also been attributed to the animal, including resting traces. Another species, Dilophosaurus sinensis from China, was named in 1993, but was later found to belong to the genus Sinosaurus. At about 7 m (23 ft) in length, with a weight of about 400 kg (880 lb), Dilophosaurus was one of the earliest large predatory dinosaurs and the largest known land-animal in North America at the time. It was slender and lightly built, and the skull was proportionally large, but delicate. The snout was narrow, and the upper jaw had a gap or kink below the nostril. It had a pair of longitudinal, arched crests on its skull; their complete shape is unknown, but they were probably enlarged by keratin. The mandible was slender and delicate at the front, but deep at the back. The teeth were long, curved, thin, and compressed sideways. Those in the lower jaw were much smaller than those of the upper jaw. Most of the teeth had serrations at their front and back edges. The neck was long, and its vertebrae were hollow, and very light. The arms were powerful, with a long and slender upper arm bone. The hands had four fingers; the first was short but strong and bore a large claw, the two following fingers were longer and slenderer with smaller claws; the fourth was vestigial. The thigh bone was massive, the feet were stout, and the toes bore large claws. Dilophosaurus is a member of the family Dilophosauridae along with Dracovenator, a group placed between the Coelophysidae and later theropods. Dilophosaurus would have been active and bipedal, and may have hunted large animals; it could also have fed on smaller animals and fish. Due to the limited range of movement and shortness of the forelimbs, the mouth may instead have made first contact with prey. The function of the crests is unknown; they were too weak for battle, but may have been used in visual display, such as species recognition and sexual selection. It may have grown rapidly, attaining a growth rate of 30 to 35 kg (66 to 77 lb) per year early in life. The holotype specimen had multiple paleopathologies, including healed injuries and signs of a developmental anomaly. Dilophosaurus is known from the Kayenta Formation, and lived alongside dinosaurs such as Megapnosaurus and Sarahsaurus. Dilophosaurus was featured in the novel Jurassic Park and its movie adaptation, wherein it was given the fictional abilities to spit venom and expand a neck frill, as well as being smaller than the real animal. It was designated as the state dinosaur of Connecticut based on tracks found there.
  • 4.8K
  • 18 Oct 2022
Topic Review
Holomovement
The holomovement brings together the holistic principle of "undivided wholeness" with the idea that everything is in a state of process or becoming (David Bohm calls it the "universal flux"). In this interpretation of physics wholeness is not considered static, but as a dynamic interconnected process. The concept is presented most fully in Wholeness and the Implicate Order, published in 1980.
  • 4.8K
  • 06 Oct 2022
Topic Review
Sulfate-Reducing Bacteria
Sulfate-reducing bacteria (SRB) are a group of anaerobic microorganisms that can be present in the environment and gastrointestinal tract as a part of the intestinal microbiome and can be involved in inflammatory bowel diseases (IBDs), including ulcerative colitis in the human and animals.
  • 4.8K
  • 07 Feb 2021
Topic Review
Myocyte
A myocyte (also known as a muscle cell) is the type of cell found in some types of muscle tissue. Myocytes develop from myoblasts to form muscles in a process known as myogenesis. There are two specialized forms of myocytes with distinct properties: cardiac, and smooth muscle cells. On the other hand, skeletal muscles are formed by morphological units referred to as muscle fibers. Cardiomyocytes are the cells that form the chambers of the heart, and have a single central nucleus. Skeletal muscle fibers help support and move the body and are called syncytia – multinucleated structures formed by fusion of individual myoblasts during embryonic development. Smooth muscle cells control involuntary movements such as the peristalsis contractions in the oesophagus and stomach.
  • 4.8K
  • 25 Oct 2022
Topic Review
Resistance of PVD Coatings
Due to the increasing maintenance costs of hydraulic machines related to the damages caused by cavitation erosion and/or erosion of solid particles, as well as in tribological connections, surface protection of these components is very important. Up to now, numerous investigations of resistance of coatings, mainly nitride coatings, such as CrN, TiN, TiCN, (Ti,Cr)N coatings and multilayer TiN/Ti, ZrN/CrN and TN/(Ti,Al)N coatings, produced by physical vapor deposition (PVD) method using different techniques of deposition, such as magnetron sputtering, arc evaporation or ion plating, to cavitation erosion, solid particle erosion and wear have been made. The results of these investigations, degradation processes and main test devices used are presented in this paper. An effect of deposition of mono- and multi-layer PVD coatings on duration of incubation period, cumulative weight loss and erosion rate, as well as on wear rate and coefficient of friction in tribological tests is discussed. It is shown that PVD coating does not always provide extended incubation time and/or improved resistance to mentioned types of damage. The influence of structure, hardness, residence to plastic deformation and stresses in the coatings on erosion and wear resistance is discussed. In the case of cavitation erosion and solid particle erosion, a limit value of the ratio of hardness (H) to Young’s modulus (E) exists at which the best resistance is gained. In the case of tribological tests, the higher the H/E ratio and the lower the coefficient of friction, the lower the wear rate, but there are also many exceptions
  • 4.8K
  • 13 Oct 2020
Topic Review
Integrated Blockchain-Cloud Architecture for Healthcare
Blockchain is a disruptive technology for shaping the next era of a healthcare system striving for efficient and effective patient care. This is thanks to its peer-to-peer, secure, and transparent characteristics. On the other hand, cloud computing made its way into the healthcare system thanks to its elasticity and cost-efficiency nature. However, cloud-based systems fail to provide a secured and private patient-centric cohesive view to multiple healthcare stakeholders. In this situation, blockchain provides solutions to address security and privacy concerns of the cloud because of its decentralization feature combined with data security and privacy, while cloud provides solutions to the blockchain scalability and efficiency challenges. Therefore a novel paradigm of blockchain-cloud integration (BcC) emerges for the domain of healthcare.
  • 4.8K
  • 14 Sep 2021
Topic Review
Recognition Memory
Recognition memory, a subcategory of declarative memory, is the ability to recognize previously encountered events, objects, or people. When the previously experienced event is reexperienced, this environmental content is matched to stored memory representations, eliciting matching signals. As first established by psychology experiments in the 1970s, recognition memory for pictures is quite remarkable: humans can remember thousands of images at high accuracy after seeing each only once and only for a few seconds. Recognition memory can be subdivided into two component processes: recollection and familiarity, sometimes referred to as "remembering" and "knowing", respectively. Recollection is the retrieval of details associated with the previously experienced event. In contrast, familiarity is the feeling that the event was previously experienced, without recollection. Thus, the fundamental distinction between the two processes is that recollection is a slow, controlled search process, whereas familiarity is a fast, automatic process. Mandler's "Butcher-on-the-bus" example: Imagine taking a seat on a crowded bus. You look to your left and notice a man. Immediately, you are overcome with this sense that you've seen this man before, but you cannot remember who he is. This automatically elicited feeling is familiarity. While trying to remember who this man is, you begin retrieving specific details about your previous encounter. For example, you might remember that this man handed you a fine chop of meat in the grocery store. Or perhaps you remember him wearing an apron. This search process is recollection.
  • 4.8K
  • 29 Nov 2022
Topic Review
Origins of Judaism
The origins of Judaism lie in the Bronze Age amidst polytheistic ancient Semitic religions, specifically Canaanite religion, co-existing with a syncretization with elements of Babylonian religion and of the worship of Yahweh reflected in the early prophetic books of the Hebrew Bible. During the Iron Age I, the Israelite religion became distinct from other Canaanite religions due to the unique monolatristic (proto-monotheistic) worship of Yahweh. During the Babylonian captivity of the 6th and 5th centuries BCE (Iron Age II), certain circles within the exiled Judahites in Babylon refined pre-existing ideas about monotheism, election, divine law and Covenant into a strict monotheistic theology which came to dominate the former Kingdom of Judah in the following centuries. From the 5th century BCE until 70 CE, Israelite religion developed into the various theological schools of Second Temple Judaism, besides Hellenistic Judaism in the diaspora. Second Temple eschatology was significantly influenced by Zoroastrianism. The text of the Hebrew Bible was redacted into its extant form in this period and possibly also canonized as well. Rabbinic Judaism developed during Late Antiquity, during the 3rd to 6th centuries CE; the Masoretic Text of the Hebrew Bible and the Talmud were compiled in this period. The oldest manuscripts of the Masoretic tradition come from the 10th and 11th centuries CE; in the form of the Aleppo Codex of the later portions of the 10th century CE and the Leningrad Codex dated to 1008–1009 CE. Due largely to censoring and the burning of manuscripts in medieval Europe the oldest existing manuscripts of various rabbinical works are quite late. The oldest surviving complete manuscript copy of the Babylonian Talmud is dated to 1342 CE.
  • 4.8K
  • 10 Nov 2022
Topic Review
Minor Basilica
A minor basilica (Latin: Basilica minor, Basilicæ minores in plural) is a Catholic church building that has been granted the title of basilica by the Holy See or immemorial custom. Presently, the authorising decree is granted by the Pope through the Congregation for Divine Worship and the Discipline of the Sacraments. In relation to churches, writers on architecture use the term "basilica" to describe a church built in a particular style. The early Christian purpose-built cathedral basilica of the bishop was in this style, constructed on the model of the semi-public secular basilicas, and its growth in size and importance signalled the gradual transfer of civic power into episcopal hands, which was under way in the 5th century. In the 18th century, the term took on a canonical sense, unrelated to this architectural style. Basilicas in this canonical sense are divided into major ("greater") and minor basilicas. Today only four, all in Rome, are classified as major basilicas.
  • 4.8K
  • 30 Nov 2022
Topic Review
Embraer KC-390
The Embraer KC-390 is a medium-size, twin-engine jet-powered military transport aircraft under development by Brazil ian aerospace manufacturer Embraer, able to perform aerial refuelling and to transport cargo and troops. It is the heaviest aircraft that the company has made to date, and will be able to transport up to 26 tonnes (29 tons) of cargo, including wheeled armoured fighting vehicles.
  • 4.8K
  • 31 Oct 2022
Topic Review Peer Reviewed
Peter IV of Aragon (1336–1387)
Peter IV king of Aragón (1336–1387). He was the seventh king of the Crown of Aragon, and father of Juan I (1387–1396) and Martín I (1396–1410), the last members of the dynasty to take the throne. When Martín died, the Trastámara branch occupied the throne of the kingdom. Peter IV was dazzling in his ability to use art as a tool of authority and sovereignty. With the aim of exalting the dynasty, he patronised various enterprises, among the most important of which was the abbey of Santa Maria de Poblet, which he intended to be a burial place for himself and his successors, a wish that was fulfilled, without exception, down to Juan II, the predecessor of the Catholic Monarchs. A perfectionist and zealot, he endowed important religious events with profound political significance, and promoted works of great symbolism such as the genealogy of the new saló del tinell, or the ordinacions de la casa i cort, to which he added an appendix establishing how the kings of Aragon were to be crowned. 
  • 4.8K
  • 13 Apr 2022
Topic Review
Chemistry and Biosynthesis of Melatonin
Melatonin is a ubiquitous indolamine, largely investigated for its key role in the regulation of several physiological processes in both animals and plants. In the last century, it was reported that this molecule may be produced in high concentrations by several species belonging to the plant kingdom and stored in specialized tissues. 
  • 4.8K
  • 29 Mar 2022
Topic Review
Economic Disparity in South Korea
Economic disparity in South Korea is the extent by which income, most commonly measured by household or individual, is distributed in an uneven manner in South Korea . According to data during the 2010s, low-income earners[lower-alpha 1] make up to 40% of South Korea's entire labour force. Conversely, the highest income earners[lower-alpha 2] make up only 1–1.3% of the labour force. In general, 98.7% of South Koreans make less than annually. According to 2015 data, more than 63% of workers make less than Template:KRWConvert annually. Many South Koreans especially those of the younger generation feel that they are not benefiting during periods of economic growth, and have criticized the increasingly difficult socioeconomic situation and class stratification in the country, dubbing it as "Hell Joseon" (Korean: 헬조선). They have also described themselves as being a part of the Sampo generation, whereby they have given up on courtship, marriage, and having kids due to the high costs of living and unemployment, and consequently the N-po generation. Moreover, much of the country's income inequality can be attributed to the dominance of chaebols (Korean: 재벌; lit. "rich family"), which has also been seen by many South Koreans as highly corrupt and influential in the political system. Its dominance is also likely to last and engenders the risk of slowing down the transformation of the South Korean economy for the benefit of future generations. The country also has the highest levels of poverty among the elderly in the developed world. In 2018, about half of the country's elderly lived in poverty, three times the OECD average, with many of them homeless. As a result, South Korea regularly claims the highest suicide rate in the OECD and the wider developed world.
  • 4.8K
  • 04 Nov 2022
Topic Review
Carbon Cycling in Mangrove Ecosystems
The carbon cycle in mangrove ecosystems is an important biogeochemical pathway in understanding the links between this forest ecosystem and both the atmosphere and the adjacent coastal ocean. Mangroves are a major habitat in the coastal zone for storing carbon in the soils of their deep forest floor, and for exporting to adjacent coastal seas significant quantities of dissolved inorganic carbon (DIC). The large export of DIC is sufficient to result in adjacent coastal waters becoming a source of carbon dioxide to the atmosphere in tropical and subtropical latitudes.
  • 4.8K
  • 21 Sep 2020
Topic Review
Soil Desalination
Salinity is a major threat that reduces the capacity of all types of terrestrial ecosystems to provide services by threatening biodiversity, lowering agriculture production, degrading the environment, contaminating groundwater below standard levels, increasing flood risks, creating food security concerns, and limiting a community’s economic growth.
  • 4.8K
  • 21 Apr 2022
Topic Review
Meo (Telecommunication Service)
MEO is a mobile and fixed telecommunications service and brand from Altice Portugal (formerly Portugal Telecom), managed by MEO - Serviços de Comunicações e Multimédia. The service was piloted in Lisbon in 2006 and was later extended to Porto and Castelo Branco.
  • 4.8K
  • 03 Nov 2022
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