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Topic Review
Resistive Gas Sensor
With a series of widespread applications, resistive gas sensors are considered to be promising candidates for gas detection, benefiting from their small size, ease-of-fabrication, low power consumption and outstanding maintenance properties. One-dimensional (1-D) nanomaterials, which have large specific surface areas, abundant exposed active sites and high length-to-diameter ratios, enable fast charge transfers and gas-sensitive reactions. They can also significantly enhance the sensitivity and response speed of resistive gas sensors.
  • 3.3K
  • 17 Aug 2021
Topic Review
Taxonomy
In biology, taxonomy (from grc τάξις (taxis) 'arrangement', and -νομία (-nomia) 'method') is the scientific study of naming, defining (circumscribing) and classifying groups of biological organisms based on shared characteristics. Organisms are grouped into taxa (singular: taxon) and these groups are given a taxonomic rank; groups of a given rank can be aggregated to form a more inclusive group of higher rank, thus creating a taxonomic hierarchy. The principal ranks in modern use are domain, kingdom, phylum (division is sometimes used in botany in place of phylum), class, order, family, genus, and species. The Swedish botanist Carl Linnaeus is regarded as the founder of the current system of taxonomy, as he developed a ranked system known as Linnaean taxonomy for categorizing organisms and binomial nomenclature for naming organisms. With advances in the theory, data and analytical technology of biological systematics, the Linnaean system has transformed into a system of modern biological classification intended to reflect the evolutionary relationships among organisms, both living and extinct.
  • 3.3K
  • 05 Dec 2022
Topic Review
AuNPs
Gold nanoparticles (AuNPs) have gained high prominence in the biomedicine field, due to their own physico-chemical properties that are suitable for different imaging or therapeutic uses, versatile structural modification, including easy functionalization of their surface with different chemical entities (e.g., chelators, targeting biomolecules or cytotoxic drugs), favourable biological half-life, low toxicity and biocompatibility. In particular, the use of AuNPs in radiopharmaceutical development has provided various nanometric platforms for the delivery of medically relevant radioisotopes for SPECT/PET diagnosis and/or radionuclide therapy
  • 3.3K
  • 20 Jan 2021
Topic Review
Background on Computing Paradigms
General overview of the different mentioned paradigms needs to be provided in order to be oriented in the computing field. For clarity and consistency, each paradigm is carefully discussed concisely in the oncoming text. The reason for discussing each of these paradigms is to have an overview that will guide the understanding of the research goal for this entry, which is primarily the information security and privacy aspects for each paradigm.
  • 3.3K
  • 25 Feb 2022
Topic Review
Starship (Spacecraft)
Starship is the fully reusable second stage and space vehicle of the SpaceX BFR "Super Heavy" rocket currently under development by SpaceX. It is a long-duration cargo- and passenger-carrying spacecraft that also serves as the BFR launch vehicle second stage and integrated payload section. Three 9-meter (30 ft)-diameter stainless steel Starship test articles are being built, and one had already begun integrated system testing by March 2019. The Starship test flight rocket—Starhopper—will be used for initial integrated testing of the Raptor rocket engine with a flight-capable propellant structure as well as for low-altitude, low-velocity flight testing of launches and landings. It began hotfire testing in April 2019. Two additional test articles, Starship orbital prototypes, are being built by competing teams in South Texas and along the space coast of Florida. They are planned to be used after mid-2019 for high-altitude, high-velocity testing. Integrated system testing of Starhopper, including the first flight test, began in April 2019. SpaceX is planning to launch commercial payloads using Starship no earlier than 2021.
  • 3.3K
  • 21 Oct 2022
Topic Review
Shape of Dog's Nasal Cavity and Smell
Modern dogs are the most morphologically diverse group of mammals. Numerous studies have shown that dogs and their olfactory abilities are of great importance to humans. It was found that the changes within the skull have had a significant impact on the structure of the initial sections of the respiratory system, including the turbinates of the nasal passages. Congenital defects, defined as brachycephalic syndrome, are currently a significant problem in dog breeding as they can affect animal welfare and even lead to death.
  • 3.3K
  • 19 Apr 2022
Topic Review
Leadership
Leadership is both a research area and a practical skill encompassing the ability of an individual or organization to "lead" or guide other individuals, teams, or entire organizations. Specialist literature debates various viewpoints, contrasting Eastern and Western approaches to leadership, and also (within the West) United States versus European approaches. U.S. academic environments define leadership as "a process of social influence in which a person can enlist the aid and support of others in the accomplishment of a common task". Leadership seen from a European and non-academic perspective encompasses a view of a leader who can be moved not only by communitarian goals but also, as the European researcher Daniele Trevisani sugggests, by the search for personal power. Studies of leadership have produced theories involving traits, situational interaction, function, behavior, power, vision and values, charisma, and intelligence, among others.
  • 3.3K
  • 21 Nov 2022
Topic Review
Mechanism of seed anaerobic germination
As sessile organisms, flooding/submergence is one of the major abiotic stresses for higher plants, with deleterious effects on their growth and survival. Therefore, flooding/submergence is a large challenge for agriculture in lowland areas worldwide. Long-term flooding/submergence can cause severe hypoxia stress to crop plants and can result in substantial yield loss. Rice has evolved distinct adaptive strategies in response to low oxygen (O2) stress caused by flooding/submergence circumstances. Recently, direct seeding practice has been increasing in popularity due to its advantages of reducing cultivation cost and labor. However, establishment and growth of the seedlings from seed germination under the submergence condition are large obstacles for rice in direct seeding practice. The physiological and molecular regulatory mechanisms underlying tolerant and sensitive phenotypes in rice have been extensively investigated. Here, this review focuses on the progress of recent advances in the studies of the molecular mechanisms and metabolic adaptions underlying anaerobic germination (AG) and coleoptile elongation. Further, we highlight the prospect of introducing quantitative trait loci (QTL) for AG into rice mega varieties to ensure the compatibility of flooding/submergence tolerance traits and yield stability, thereby advancing the direct seeding practice and facilitating future breeding improvement.
  • 3.3K
  • 19 Oct 2020
Topic Review
Matrix Metalloproteinases and Their Inhibitors
Matrix metalloproteinases (MMPs) are a family of zinc-dependent extracellular matrix (ECM) remodeling endopeptidases that have the capacity to degrade almost every component of the ECM. The degradation of the ECM is of great importance, since it is related to embryonic development and angiogenesis. It is also involved in cell repair and the remodeling of tissues. When the expression of MMPs is altered, it can generate the abnormal degradation of the ECM. This is the initial cause of the development of chronic degenerative diseases and vascular complications generated by diabetes. In addition, this process has an association with neurodegeneration and cancer progression. Within the ECM, the tissue inhibitors of MMPs (TIMPs) inhibit the proteolytic activity of MMPs. TIMPs are important regulators of ECM turnover, tissue remodeling, and cellular behavior. Therefore, TIMPs (similar to MMPs) modulate angiogenesis, cell proliferation, and apoptosis. An interruption in the balance between MMPs and TIMPs has been implicated in the pathophysiology and progression of several diseases.
  • 3.3K
  • 18 Sep 2021
Topic Review
Astana
Astana, previously known as Akmolinsk, Tselinograd, Akmola and most recently Nur-Sultan, is the capital city of Kazakhstan. The city lies on the banks of the Ishim River in the north-central part of Kazakhstan, within the Akmola Region, though administered as a city with special status separately from the rest of the region. A 2020 official estimate reported a population of 1,136,008 within the city limits, making it the second-largest city in the country, after Almaty, which had been the capital until 1997. The city became the capital of Kazakhstan in 1997; since then it has grown and developed economically into one of the most modern cities in Central Asia. In 2021, the government selected Astana as one of the 10 priority destinations for tourist development. Modern Astana is a planned city, following the process of other planned capitals. After it became the capital of Kazakhstan, the city dramatically changed its shape. The city's master-plan was designed by Japanese architect Kisho Kurokawa. As the seat of the government of Kazakhstan, Astana is the site of the Parliament House, the Supreme Court, the Ak Orda Presidential Palace and numerous government departments and agencies. It is home to a range of futuristic buildings, including many skyscrapers.
  • 3.3K
  • 03 Mar 2023
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