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Topic Review
Cyclic Adenosine Monophosphate
Cyclic adenosine monophosphate (cAMP, cyclic AMP, or 3',5'-cyclic adenosine monophosphate) is a second messenger important in many biological processes. cAMP is a derivative of adenosine triphosphate (ATP) and used for intracellular signal transduction in many different organisms, conveying the cAMP-dependent pathway.
  • 2.4K
  • 10 Nov 2022
Topic Review
Plant-Based Natural Coagulants for Water and Wastewater Treatment
Plant-based natural coagulants (PBNCs) have been shown to be a promising alternative to the conventional coagulants used in water treatment. PBNCs’ advantages include excellent biodegradability, biocompatibility, sustainable production, low cost, and high availability. Problems associated with using PBNC have hindered the progression of their practical applications and commercialisation. However, several modification methods have been employed to enhance the performance of various plant polysaccharides to overcome these disadvantages.
  • 2.4K
  • 09 Mar 2023
Topic Review
Carbon nanotubes (CNTs)
Carbon nanotubes (CNTs) are considered a promising nanomaterial for diverse applications owing to their attractive physicochemical properties such as high surface area, superior mechanical and thermal strength, electrochemical activity, and so on.
  • 2.4K
  • 10 Sep 2020
Topic Review
Women of the Wall
Women of the Wall (Hebrew: נשות הכותל, Neshot HaKotel) is a multi-denominational feminist organization based in Israel whose goal is to secure the rights of women to pray at the Western Wall, also called the Kotel, in a fashion that includes singing, reading aloud from the Torah and wearing religious garments (tallit, tefillin and kippah). Pew Research Center has identified Israel as one of the countries that place "high" restrictions on religion, and there have been limits placed on non-Orthodox streams of Judaism. One of those restrictions is that the Rabbi of the Western Wall has enforced gender segregation and limitations on religious garb worn by women. When the "Women of the Wall" hold monthly prayer services for women on Rosh Hodesh, they observe gender segregation so that Orthodox members may fully participate. But their use of religious garb, singing and reading from a Torah have upset many members of the Orthodox Jewish community, sparking protests and arrests. In May 2013 a judge ruled that a 2003 Israeli Supreme Court ruling prohibiting women from carrying a Torah or wearing prayer shawls had been misinterpreted and that Women of the Wall prayer gatherings at the wall should not be deemed illegal. In January 2016, the Israeli Cabinet approved a plan to designate a new space at the Kotel that would be available for egalitarian prayer and which would not be controlled by the Rabbinate. Women of the Wall welcomed the decision, but the plan faced opposition from other factions, including some ultra-Orthodox members of Prime Minister Benjamin Netanyahu's governing coalition, who threatened to withdraw over the government's plan to create non-Orthodox prayer space at the Western Wall in deference to the Women of the Wall. In January 2017, the Israeli High Court ruled that if the government of Israel could not find "good cause" to prohibit women reading from the Torah in prayer services at the Kotel within 30 days, women could do so; they also ruled that the Israeli government could no longer argue that the Robinson's Arch area of the plaza is access to the Kotel. The petition for women to read from the Torah at the Kotel had been brought by a group that split off from the Women of the Wall, calling itself the "Original Women of the Wall". In June 2017, it was announced that the plan approved in January 2016 had been suspended. According to Ronit Kampf, the group's struggle has been "the most covered women's issue in the history of the Israeli media."
  • 2.4K
  • 14 Oct 2022
Topic Review
ITER
International Thermonuclear Experimental Reactor is an international nuclear fusion research and engineering megaproject, which will be the world's largest magnetic confinement plasma physics experiment. It is an experimental tokamak nuclear fusion reactor that is being built next to the Cadarache facility in Saint-Paul-lès-Durance, in Provence, southern France. The ITER thermonuclear fusion reactor has been designed to produce a fusion plasma equivalent to 500 megawatts (MW) of thermal output power for around twenty minutes while 50 megawatts of thermal power are injected into the tokamak, resulting in a ten-fold gain of plasma heating power. Thereby the machine aims to demonstrate the principle of producing more thermal power from the fusion process than is used to heat the plasma, something that has not yet been achieved in any fusion reactor. The total electricity consumed by the reactor and facilities will range from 110 MW up to 620 MW peak for 30-second periods during plasma operation. Thermal-to-electric conversion is not included in the design because ITER will not produce sufficient power for net electrical production. The emitted heat from the fusion reaction will be vented to the atmosphere. The project is funded and run by seven member entities—the European Union, India , Japan , China , Russia , South Korea and the United States . The EU, as host party for the ITER complex, is contributing about 45 percent of the cost, with the other six parties contributing approximately 9 percent each. In 2016 the ITER organization signed a technical cooperation agreement with the national nuclear fusion agency of Australia , granting this country access to research results of ITER in exchange for construction of selected parts of the ITER machine. Construction of the ITER Tokamak complex started in 2013 and the building costs were over US$14 billion by June 2015. The construction of the facility is expected to be completed in 2025 when commissioning of the reactor can commence. Initial plasma experiments are scheduled to begin in 2025, with full deuterium–tritium fusion experiments starting in 2035. If ITER becomes operational, it will become the largest magnetic confinement plasma physics experiment in use with a plasma volume of 840 cubic meters, surpassing the Joint European Torus by almost a factor of 10. The goal of ITER is to demonstrate the scientific and technological feasibility of fusion energy for peaceful use. It is the largest of more than 100 fusion reactors built since the 1950s. ITER's planned successor, DEMO, is expected to be the first fusion reactor to produce electricity in an experimental environment. DEMO's anticipated success is expected to lead to full-scale electricity-producing fusion power stations and future commercial reactors.
  • 2.4K
  • 01 Dec 2022
Topic Review
Cetus
Cetus, known as the Whale, is a large constellation visible in the southern sky. In Greek mythology, Cetus represents the sea monster sent by Poseidon to terrorize the kingdom of Aethiopia, eventually slain by Perseus to rescue Andromeda. As one of the 88 recognized constellations, Cetus holds a special place in the realm of astronomy and mythology. 
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  • 08 Mar 2024
Topic Review
Mechanism of Heterogeneous Alkaline Deacetylation of Chitin
Chitosan can be obtained from chitin chemically or by using enzymatic preparations. From a chemical point of view, both acids and alkalis can be used to deacetylate chitin. However, alkaline deacetylation is used more often since glycosidic bonds are very sensitive to an acidic environment, in which they are destroyed. A mechanism for the chitin deacetylation reaction is proposed, taking into account its kinetic features in which the decisive role is assigned to the effects of hydration. It has been shown that the rate of chitin deacetylation increases with a decrease in the degree of hydration of hydroxide ions in a concentrated alkali solution. When the alkali concentration is less than the limit of complete hydration, the reaction practically does not occur. Hypotheses have been put forward to explain the decrease in the rate of the reaction in the second flat portion of the kinetic curve. The first hypothesis is the formation of “free” water, leading to the hydration of chitin molecules and a decrease in the reaction rate. The second hypothesis postulates the formation of a stable amide anion of chitosan, which prevents the nucleophilic attack of the chitin macromolecule by hydroxide ions.
  • 2.4K
  • 19 Jun 2023
Topic Review
Hybrid Distribution Transformers
Distribution transformers are one of the pillars of the distribution grid. They are the interface between the medium and low-voltage grid, stepping-down the voltages to a safe and usable range for the end-users. 
  • 2.4K
  • 26 Jul 2021
Topic Review
Low-Temperature SCR Catalyst Development
In recent years, low-temperature SCR (Selective Catalytic Reduction) denitrification technology has been popularized in non-power industries and has played an important role in the control of industrial flue gas NOx emissions in China. Currently, the most commonly used catalysts in industry are V2O5-WO3(MoO3)/TiO2, MnO2-based catalysts, CeO2-based catalysts, MnO2-CeO2 catalysts and zeolite SCR catalysts. The flue gas emitted during industrial combustion usually contains SO2, moisture and alkali metals, which can affect the service life of SCR catalysts.
  • 2.4K
  • 31 Mar 2022
Topic Review
Solid Adsorbents for CO2 Capture
Carbon capture and storage (CCS) is considered to be a promising technology in reducing atmospheric CO2 concentration. Among the CO2 capture technologies, adsorption has grabbed significant attention owing to its advantageous characteristics discovered in recent years. Solid adsorbents have emerged as one of the most versatile CO2 adsorbents. 
  • 2.4K
  • 23 Feb 2023
Topic Review
Coccidioidomycosis
Coccidioidomycosis, also known as Valley fever, is an endemic fungal infection commonly found in the southwestern parts of the United States. However, the disease has seen an increase in both in its area of residency and its prevalence. This entry compiles some of the latest information on the epidemiology, current and in-development pharmaceutical approaches to treat the disease, trends and projections, diagnostic concerns, and the overlapping dynamics of coccidioidomycosis and COVID-19, including in special populations. This entry provides an overview of the current diagnostic and therapeutic strategies and identifies areas of future development.
  • 2.4K
  • 22 Apr 2022
Topic Review
Doctor of Canon Law
Doctor of Canon Law (Latin: Juris Canonici Doctor; JCD) is the doctoral-level terminal degree in the studies of canon law of the Roman Catholic Church. It can also be an honorary degree awarded by Anglican colleges. It may also be abbreviated ICD or dr.iur.can. (Iuris Canonici Doctor), ICDr, DCL, DCnl, DDC, or DCanL (Doctor of Canon Law). A doctor of both laws (i.e. canon and civil) is a JUD (Juris Utriusque Doctor) or UJD (Utriusque Juris Doctor).
  • 2.4K
  • 02 Nov 2022
Topic Review
Works of Mercy
Works of mercy (sometimes known as acts of mercy) are practices considered meritorious in Christian ethics. The practice is popular in the Catholic Church as an act of both penance and charity. In addition, the Methodist church teaches that the works of mercy are a means of grace which lead to holiness and aid in sanctification. The works of mercy have been traditionally divided into two categories, each with seven elements: Pope John Paul II issued a papal encyclical "Dives in misericordia" on 30 November 1980 declaring that "Jesus Christ taught that man not only receives and experiences the mercy of God, but that he is also called 'to practice mercy' towards others." Another notable devotion associated with the works of mercy is the Divine Mercy, which derives from apparitions of Jesus Christ to Saint Faustina Kowalska.
  • 2.4K
  • 25 Nov 2022
Topic Review
Rpm
RPM Package Manager (RPM) (originally Red Hat Package Manager; now a recursive acronym) is a package management system. The name RPM refers to the following: the .rpm file format, files in the .rpm file format, software packaged in such files, and the package manager program itself. RPM was intended primarily for Linux distributions; the file format is the baseline package format of the Linux Standard Base. Even though it was created for use in Red Hat Linux, RPM is now used in many Linux distributions. It has also been ported to some other operating systems, such as Novell NetWare (as of version 6.5 SP3), IBM's AIX (as of version 4), CentOS, Fedora (operating system) created jointly between Red Hat and the Fedora community, and Oracle Linux. All versions or variants of the these Linux operating systems use the RPM Package Manager. An RPM package can contain an arbitrary set of files. The larger part of RPM files encountered are “binary RPMs” (or BRPMs) containing the compiled version of some software. There are also “source RPMs” (or SRPMs) files containing the source code used to produce a package. These have an appropriate tag in the file header that distinguishes them from normal (B)RPMs, causing them to be extracted to /usr/src on installation. SRPMs customarily carry the file extension “.src.rpm” (.spm on file systems limited to 3 extension characters, e.g. old DOS FAT).
  • 2.4K
  • 28 Nov 2022
Topic Review
Blastula
The blastula (from Greek βλαστός (blastos), meaning "sprout") is a hollow sphere of cells, referred to as blastomeres, surrounding an inner fluid-filled cavity called the blastocoel formed during an early stage of embryonic development in animals. Embryo development begins with a sperm fertilizing an egg to become a zygote which undergoes many cleavages to develop into a ball of cells called a morula. Only when the blastocoel is formed does the early embryo become a blastula. The blastula precedes the formation of the gastrula in which the germ layers of the embryo form. A common feature of a vertebrate blastula is that it consists of a layer of blastomeres, known as the blastoderm, which surrounds the blastocoel. In mammals the blastula is referred to as a blastocyst. The blastocyst contains an embryoblast (or inner cell mass) that will eventually give rise to the definitive structures of the fetus, and the trophoblast, which goes on to form the extra-embryonic tissues. During the blastula stage of development, a significant amount of activity occurs within the early embryo to establish cell polarity, cell specification, axis formation, and to regulate gene expression. In many animals such as Drosophila and Xenopus, the mid blastula transition (MBT) is a crucial step in development during which the maternal mRNA is degraded and control over development is passed to the embryo. Many of the interactions between blastomeres are dependent on cadherin expression, particularly E-cadherin in mammals and EP-cadherin in amphibians. The study of the blastula and of cell specification has many implications in stem cell research and assisted reproductive technology. In Xenopus, blastomeres behave as pluripotent stem cells which can migrate down several pathways, depending on cell signaling. By manipulating the cell signals during the blastula stage of development, various tissues can be formed. This potential can be instrumental in regenerative medicine for disease and injury cases. In vitro fertilisation involves implantation of a blastula into a mother's uterus. Blastula cell implantation could serve to eliminate infertility.
  • 2.4K
  • 30 Nov 2022
Topic Review
Dutch Expedition to Southern Chile (1643)
The following article analyzes how the Dutch expedition to southern Chile during the 17th century (1642–1643) was narrated, in Dutch and in its translations into German, English, and Spanish, considering the interests of empires and the discursive differences that translational variations reveal. This transdisciplinary analysis, combining historiography, translation studies, and historical geography, consists of a critical reading of the original narration and a comparative reading of the aforementioned translations, and within them ethnographic representations made about the Mapuche-Huilliche people and the city of Valdivia and changes introduced by different translations are identified.
  • 2.4K
  • 04 Jan 2024
Topic Review
Sand Dam Technology
Sand dam technology filters and protects water from contamination and evaporation with low to no maintenance cost. Sand dams improve the socio-economy of the community and help to cope with drought and climate change. However, success depends on the site selection, design, and construction. The ideal site for a sand dam is at a transition between mountains and plains, with no bend, intermediate slope, and impermeable riverbed in a catchment with a slope greater than 2°. The spillway dimensioning considers the flow velocity, sediment properties, and storage target, and the construction is in multi-stages. Recently, the failure of several sand dams because of incorrect siting, evaporation loss, and one-stage construction were reported. Revision of practitioners’ manuals by considering catchment scale hydrological and hydrogeological characteristics, spillway height, and sediment transport are recommended. Research shows that protected wells have better water quality than open wells and scoop holes. Therefore, the community should avoid open defecation, pit latrines, tethering of animals, and applying pesticides near the sand dam. 
  • 2.4K
  • 01 Jul 2021
Topic Review
Endothelial Cell Metabolism
EC (Endothelial Cell) metabolism is confined to glucose, FAs, and amino acids (AAs), the three major substrates for adenosine triphosphate (ATP) production and biomass production in ECs, which have been widely studied and summarized.
  • 2.4K
  • 01 Feb 2023
Topic Review
Gestational Diabetes Mellitus (GDM)
Gestational Diabetes Mellitus (GDM) is a transient condition characterized by carbohydrate intolerance, hyperglycemia, peripheral insulin resistance, insufficient insulin secretion or activity, endothelial dysfunction, and low-grade inflammation during pregnancy, frequently with the first onset between 24 and 28 weeks of gestation.
  • 2.4K
  • 28 Sep 2021
Topic Review
Anomalocaridid
The Anomalocaridids comprise a group of very early marine animals known primarily from fossils found in Cambrian deposits in China , United States , Canada , Poland and Australia . They were long thought to be restricted to this Cambrian time range, but the discovery of large Ordovician specimens has extended this somewhat. The later Devonian Schinderhannes shows many anomalocaridid features. Although originally interpreted as an anomalocaridid-like arthropod, some recent studies suggest that it may represent an anomalocaridid: if so it would extend the group's record by some hundred million years: the non-mineralised anomalocaridid structure means they are absent from the intermediate fossil record. Anomalocaridids are the largest Cambrian animals known—some Chinese forms may have reached 2 m (7 ft) in length—and most of them were probably active carnivores.
  • 2.4K
  • 31 Oct 2022
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