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Topic Review
Melissa officinalis
Melissa officinalis is a medicinal plant rich in biologically active compounds which is used worldwide for its therapeutic effects. Chemical studies on its composition have shown that it contains mainly flavonoids, terpenoids, phenolic acids, tannins, and essential oil. The main active constituents of Melissa officinalis are volatile compounds (geranial, neral, citronellal and geraniol), triterpenes (ursolic acid and oleanolic acid), phenolic acids (rosmarinic acid, caffeic acid and chlorogenic acid), and flavonoids (quercetin, rhamnocitrin, and luteolin). 
  • 2.8K
  • 06 Apr 2022
Topic Review
Piper betle (L)
Piper betle (L) is a popular medicinal plant in Asia. Plant leaves have been used as a traditional medicine to treat various health conditions. It is highly abundant and inexpensive, therefore promoting further research and industrialization development, including in the food and pharmaceutical industries.
  • 2.8K
  • 07 May 2021
Topic Review
Heavy metals removal from contaminated solution using seaweed
Heavy metal contamination affects lives with concomitant environmental pollution, and seaweed has emerged as a remedy with the ability to save the ecosystem, due to its eco-friendliness, affordability, availability, and effective metal ion removal rate. Heavy metals are intrinsic toxicants that are known to induce damage to multiple organs, especially when subjected to excess exposure. With respect to these growing concerns, this review presents the preferred sorption material among the many natural sorption materials. The use of seaweeds to treat contaminated solutions has demonstrated outstanding results when compared to other materials. The sorption of metal ions using dead seaweed biomass offers a comparative advantage over other natural sorption materials. This article summarizes the impact of heavy metals on the environment, and why dead seaweed biomass is regarded as the leading remediation material among the available materials. 
  • 2.8K
  • 24 Nov 2021
Topic Review
Al-Shifa Pharmaceutical Factory
The Al-Shifa (الشفاء, Arabic for "healing") pharmaceutical factory in Khartoum North, Sudan, was constructed between 1992 and 1996 with components imported from Germany , India , Italy, Sweden, Switzerland , Thailand and the United States . It was opened on 12 July 1997 and bombed by the United States on 20 August 1998. The industrial complex was composed of four buildings. It was the largest pharmaceutical factory in Khartoum and employed over 300 workers, producing medicine both for human and veterinary use. The factory was destroyed in 1998 by a missile attack launched by the United States government, killing one employee and wounding eleven. The U.S. government claimed that the factory was used for the processing of VX nerve agent and that the owners of the plant had ties to the terrorist group al-Qaeda. These justifications for the bombing were disputed by the owners of the plant, the Sudanese government, and other governments. American officials later acknowledged "that the evidence that prompted President Clinton to order the missile strike on the Shifa plant was not as solid as first portrayed. Indeed, officials later said that there was no proof that the plant had been manufacturing or storing nerve gas, as initially suspected by the Americans, or had been linked to Osama bin Laden, who was a resident of Khartoum in the 1980s." The attack took place a week after the Monica Lewinsky scandal and two months after release of the film Wag the Dog, prompting some commentators to describe the attack as a distraction for the public from the scandal.
  • 2.8K
  • 14 Oct 2022
Topic Review
Almond, Hazelnut, Pistachio and their Skin
Nuts are dry, single-seeded fruits, with a combination of beneficial compounds that aid in disease prevention and treatment. Nuts’ skins are a good source of antioxidants thanks to the presence of polyphenolic compounds and other phytochemicals that can delay or inhibit lipid oxidation and neutralization of free radicals, contributing to disease prevention and treatments. Almond, hazelnut, pistachio are three very typical and common nuts.
  • 2.8K
  • 02 Nov 2022
Topic Review
Emotional and Behavioral Disorders
Emotional and behavioral disorders (EBD; also known as behavioral and emotional disorders) refer to a disability classification used in educational settings that allows educational institutions to provide special education and related services to students who have displayed poor social and/or academic progress. The classification is often given to students after conducting a Functional Behavior Analysis. These students need individualized behavior supports such as a Behavior Intervention Plan, to receive a free and appropriate public education. Students with EBD may be eligible for an Individualized Education Plan (IEP) and/or accommodations in the classroom through a 504 Plan.
  • 2.8K
  • 11 Nov 2022
Topic Review
Hoverfly
Hoverflies, also called flower flies or syrphid flies, make up the insect family Syrphidae. As their common name suggests, they are often seen hovering or nectaring at flowers; the adults of many species feed mainly on nectar and pollen, while the larvae (maggots) eat a wide range of foods. In some species, the larvae are saprotrophs, eating decaying plant and animal matter in the soil or in ponds and streams. In other species, the larvae are insectivores and prey on aphids, thrips, and other plant-sucking insects. Insects such as aphids are considered a crop pest, and therefore the aphid-eating larvae of some hover flies serve as an economically (as well as ecologically) important predator and even potential agents for use in biological control, while the adults may be pollinators. About 6,000 species in 200 genera have been described. Hoverflies are common throughout the world and can be found on all continents except Antarctica. Hoverflies are harmless to most mammals, though many species are mimics of stinging wasps and bees, a mimicry which may serve to ward off predators.
  • 2.8K
  • 16 Nov 2022
Topic Review
Targeted Killing
Targeted killing is defined as a form of murder or assassination carried out by governments. Some analysts believe that it is a modern euphemism for the assassination of a prominent individual by a state organization or institution outside a judicial procedure or a battlefield. Since the late 20th century, the legal status of targeted killing has become a subject of contention within and between various nations. Historically, at least since the mid-eighteenth century, Western thinking has generally considered the use of assassination as a tool of statecraft to be illegal. Some academics, military personnel and officials describe targeted killing as legitimate within the context of self-defense, when employed against terrorists or combatants engaged in asymmetrical warfare. They argue that drones are more humane and more accurate than manned vehicles, and that targeted or "named killings" do not occur in any context other than a declared state of war. Some twenty-six members of United States Congress, with academics such as Gregory Johnsen and Charles Schmitz, media figures (Jeremy Scahill, Glenn Greenwald, James Traub), civil rights groups (i.e. the American Civil Liberties Union) and ex-CIA station chief in Islamabad, Robert Grenier, have criticized targeted killings as a form of extrajudicial killings, which may be illegal under both United States and international law. According to statistical analyses provided by Reprieve, nine children have been killed for every adult the United States has tried to assassinate, and, in its numerous failed attempts to kill Ayman al-Zawahri, the CIA killed 76 children and 29 adult bystanders. Scholars are also divided as to whether targeted killings are an effective counterterrorism strategy.
  • 2.8K
  • 25 Nov 2022
Topic Review
Mechanism of Advanced Oxidation Processes
Advanced oxidation processes (AOPs) involves the generation of powerful oxidizing radical groups, such as hydroxyl radicals, which function as oxidizing agents and mineralize organic chemical substances into CO2 and H2O. AOPs such as photocatalysis and photo-Fenton have been widely considered to be very effective in removing persistent organic pollutants.
  • 2.8K
  • 28 Mar 2023
Topic Review
Physiotherapy treatment for Dysphagia
Dysphagia (DP) is a condition characterised by the loss of swallowing function, due to the alteration of the oral route and of the pharyngeal and esopharyngeal phases, hindering or impeding the passage of the alimentary bolus from the mouth to the stomach. DP affects 13% of people over 65 years of age and approximately 33% of people over 80 years of age, although it has a prevalence of 55% after a stroke. The most common complications associated with this disorder are: suffocation, aspiration pneumonia, malnutrition and decreased physical activity; these must be addressed with special care and individually.
  • 2.8K
  • 27 Oct 2020
Topic Review
Morley's Trisector Theorem
In plane geometry, Morley's trisector theorem states that in any triangle, the three points of intersection of the adjacent angle trisectors form an equilateral triangle, called the first Morley triangle or simply the Morley triangle. The theorem was discovered in 1899 by Anglo-American mathematician Frank Morley. It has various generalizations; in particular, if all of the trisectors are intersected, one obtains four other equilateral triangles.
  • 2.8K
  • 17 Nov 2022
Topic Review
Polyurethanes in Biomedicine
Due to their mechanical properties, ranging from flexible to hard materials, polyurethanes (PUs) have been widely used in many industrial and biomedical applications. PU characteristics, along with their biocompatibility, make them successful biomaterials in short and medium time applications.  The most important biomedical applications of PUs include antibacterial surfaces and catheters, blood oxygenators, dialysis devices, stents, cardiac valves, vascular prostheses, bioadhesives/surgical dressings/pressure sensitive adhesives, drug delivery systems, tissue engineering scaffolds and electrospinning, nerve generation, pacemaker lead insulation and coatings for breast implants. The diversity of polyurethane properties due to the ease of bulk and surface modification plays a vital role in their applications. 
  • 2.8K
  • 28 Oct 2020
Biography
Walter Heitler
Walter Heinrich Heitler (German: [ˈhaɪtlɐ]; 2 January 1904 – 15 November 1981) was a German physicist who made contributions to quantum electrodynamics and quantum field theory. He brought chemistry under quantum mechanics through his theory of valence bonding. In 1922, Heitler began his study of physics at the Karlsruhe Technische Hochschule, in 1923 at the Humboldt University of Berlin
  • 2.8K
  • 07 Dec 2022
Topic Review
Locative Media
Locative media or location-based media (LBM) are media of communication functionally bound to a location. The physical implementation of locative media, however, is not bound to the same location to which the content refers. Location-based media delivers multimedia and other content directly to the user of a mobile device dependent upon their location. Location information determined by means such as mobile phone tracking and other emerging real-time locating system technologies like Wi-Fi or RFID can be used to customize media content presented on the device. Locative media are digital media applied to real places and thus triggering real social interactions. While mobile technologies such as the Global Positioning System (GPS), laptop computers and mobile phones enable locative media, they are not the goal for the development of projects in this field.
  • 2.8K
  • 24 Oct 2022
Topic Review
Keshi (Demon)
In Hindu mythology, Keshi (Sanskrit: केशी; Keśi, nominative singular masculine from the root Keśin, literally "long haired") is the horse-demon, killed by Krishna, an avatar of the god Vishnu. The demon was dispatched by Krishna's evil uncle Kamsa, who was destined to die at Krishna's hands. The tale of the slaying of Keshi is told in the Hindu scriptures of Bhagavata Purana, Vishnu Purana and Harivamsa. Krishna is often praised as Keshava - the slayer of Keshi - in scriptures. Theories suggested about Keshi's origins range from his being a demon of childhood diseases to the story's being inspired by the Greek Herculean labour of slaying the horses of Diomedes.
  • 2.8K
  • 09 Nov 2022
Topic Review
Applications of Aluminum-Si Alloys
Aluminum alloys are at the pinnacle of the light metal world, especially in the automotive and aerospace industries.
  • 2.8K
  • 25 Apr 2023
Topic Review
Nano-Drug Delivery Systems Targeting Colorectal Cancer
Colorectal cancer (CRC) is a usual digestive tract malignancy and the third main cause of cancer death around the world, with a high occurrence rate and mortality rate. Conventional therapies for CRC have certain side effects and restrictions. However, the exciting thing is that with the rapid development of nanotechnology, nanoparticles have gradually become more valuable drug delivery systems than traditional therapies because of their capacity to control drug release and target CRC. This also promotes the application of nano-drug targeted delivery systems in the therapy of CRC.
  • 2.8K
  • 24 May 2022
Topic Review
Manual on Uniform Traffic Control Devices
The Manual on Uniform Traffic Control Devices for Streets and Highways (usually referred to as the Manual on Uniform Traffic Control Devices, abbreviated MUTCD) is a document issued by the Federal Highway Administration (FHWA) of the United States Department of Transportation (USDOT) to specify the standards by which traffic signs, road surface markings, and signals are designed, installed, and used. These specifications include the shapes, colors, and fonts used in road markings and signs. In the United States , all traffic control devices must legally conform to these standards. The manual is used by state and local agencies as well as private construction firms to ensure that the traffic control devices they use conform to the national standard. While some state agencies have developed their own sets of standards, including their own MUTCDs, these must substantially conform to the federal MUTCD. The National Committee on Uniform Traffic Control Devices (NCUTCD) advises the FHWA on additions, revisions, and changes to the MUTCD. The United States is among the many countries that have not ratified the Vienna Convention on Road Signs and Signals. The first edition of the MUTCD was published in 1935, 33 years before the Vienna Convention was signed in 1968. The MUTCD differs significantly from the European-influenced Vienna Convention, and an attempt to adopt several of the Vienna Convention's standards during the 1970s led to confusion among many American drivers.
  • 2.8K
  • 10 Oct 2022
Topic Review
Lists of Elm Trees
Many elm (Ulmus) trees of various kinds have attained great size or otherwise become particularly noteworthy; among these are the following.
  • 2.8K
  • 30 Nov 2022
Topic Review
Adenosine A1 Receptor and Epilepsy
Adenosine acts as an endogenous anticonvulsant and seizure terminator in the brain. Many of its anticonvulsive effects are mediated through activation of the adenosine A1 receptor, a G protein-coupled receptor with a wide array of targets. Various signaling pathways are involved in the neuronal inhibition caused by adenosine A1 receptor activation. These include direct interactions of G protein subunits, the adenyl cyclase pathway and the phospholipase C pathway, which all mediate neuronal hyperpolarization and suppression of synaptic transmission.
  • 2.8K
  • 19 Jan 2021
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