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Topic Review
Circulatory Management of Polymer Waste
In modern society, it is impossible to imagine life without polymeric materials. However, managing the waste composed of these materials is one of the most significant environmental issues confronting us in the present day. Recycling polymeric waste is the most important action currently available to reduce environmental impacts worldwide and is one of the most dynamic areas in industry today. Utilizing this waste could not only benefit the environment but also promote sustainable development and circular economy management. In its program statement, the European Union has committed to support the use of sorted polymeric waste. This study reviews recent attempts to recycle this waste and convert it by alternative technologies into fine, nano-, and microscale fibers using electrospinning, blowing, melt, or centrifugal spinning.
  • 1.6K
  • 13 Sep 2021
Topic Review
Root Canal Filling Material
Endodontic treatment for a tooth with damaged dental pulp aims to both prevent and cure apical periodontitis. If the tooth is re-infected as a result of a poorly obturated root canal, periapical periodontitis may set-in due to invading bacteria.To both avoid any re-infection and improve the success rate of endodontic retreatment, a treated root canal should be three-dimensionally obturated with a biocompatible filling material. Recently, bioactive glass, one of bioceramics, is focused on the research area of biocompatible biomaterials for endodontics. Root canal sealers derived from bioactive glass-based have been developed and applied in clinical endodontic treatments. However, at present, there are few of evidence aboutthe patient outcomes, sealing mechanism, sealing ability, and removability of the sealers. Herein, we have developed a bioactive glass-based root canal sealer and provided evidence concerning its physicochemical properties, biocompatibility, sealing ability, and removability. We also review the classification of bioceramics and characteristics of bioactive glass. Additionally, we describe the application of bioactive glass to facilitate the development of a new root canal sealer. Furthermore, this review shows the potential application of bioactive glass-based cement as a root canal filling material in the absence of semisolid core material.
  • 1.6K
  • 31 Jul 2020
Topic Review
Maté (Drink)
User:RMCD bot/subject notice Maté or mate (/ˈmæteɪ/), also known as chimarrão or cimarrón, is a traditional South American caffeine-rich infused drink, that was consumed by the Guaraní and Tupí peoples. It is the National Beverage in Argentina, Uruguay and Paraguay. It is also consumed in the Bolivian Chaco, Southern Chile, Southern Brazil, Syria—the largest importer in the world—and Lebanon, where it was brought from Argentina by immigrants. It is prepared by steeping dried leaves of yerba mate (Ilex paraguariensis, known in Portuguese as erva-mate) in hot water and is served with a metal straw from a shared hollow calabash gourd. The straw is called a bombilla in Spanish, a bomba in Portuguese, and a bombija or, more generally, a masassa (straw) in Arabic. The straw is traditionally made of silver. Modern, commercially available straws are typically made of nickel silver (called alpaca), stainless steel, or hollow-stemmed cane. The gourd is known as a mate or a guampa; while in Brazil, it has the specific name of cuia, or also cabaça (the name for Indigenous-influenced calabash gourds in other regions of Brazil, still used for general food and drink in remote regions). Even if the water is supplied from a modern thermos, the infusion is traditionally drunk from mates or cuias. The maté leaves are dried, chopped, and ground into a powdery mixture called yerba, "erva" in Portuguese, which means "herb". The bombilla functions as both a straw and a sieve. The submerged end is flared, with small holes or slots that allow the brewed liquid in, but block the chunky matter that makes up much of the mixture. A modern bombilla design uses a straight tube with holes, or a spring sleeve to act as a sieve. "Tea-bag" type infusions of maté (Spanish: mate cocido, Portuguese: chá mate) have been on the market in many South American countries for many years under such trade names as "Taragüi" in Argentina, "Pajarito" and "Kurupí" in Paraguay, and Matte Leão and "Mate Real" in Brazil.
  • 1.6K
  • 03 Nov 2022
Topic Review
Fluorescent Polymers Conspectus
The development of luminescent materials is critical to humankind. The Nobel Prizes awarded in 2008 and 2010 for research on the development of green fluorescent proteins and super-resolved fluorescence imaging are proof of this (2014). Fluorescent probes, smart polymer machines, fluorescent chemosensors, fluorescence molecular thermometers, fluorescent imaging, drug delivery carriers, and other applications make fluorescent polymers (FPs) exciting materials. 
  • 1.6K
  • 22 Mar 2022
Topic Review
Using CNSL for the Synthesis of Surfactants
Cashew Nut Shell Liquid (CNSL) is a promising non-edible renewable resource, directly extracted from the shell of the cashew nut. The interesting structure of CNSL and its components (cardanol, anacardic acid and cardol) lead to the synthesis of biobased surfactants. 
  • 1.6K
  • 10 Mar 2022
Topic Review
Tropylium Ion
The tropylium ion is a non-benzenoid aromatic species that works as a catalyst. This chemical entity brings about a large number of organic transformations, such as hydroboration reactions, ring contraction, the trapping of enolates, oxidative functionalization, metathesis, insertion, acetalization, and trans-acetalization reactions. The tropylium ion also functions as a coupling reagent in synthetic reactions. This cation’s versatility can be seen in its role in the synthesis of macrocyclic compounds and cage structures.
  • 1.6K
  • 01 Jun 2023
Topic Review
Nucleic Acid
Nucleic acids are the biopolymers, or small biomolecules, essential to all known forms of life. The term nucleic acid is the overall name for DNA and RNA. They are composed of nucleotides, which are the monomers made of three components: a 5-carbon sugar, a phosphate group and a nitrogenous base. If the sugar is a compound ribose, the polymer is RNA (ribonucleic acid); if the sugar is derived from ribose as deoxyribose, the polymer is DNA (deoxyribonucleic acid). Nucleic acids are the most important of all biomolecules. They are found in abundance in all living things, where they function to create and encode and then store information in the nucleus of every living cell of every life-form organism on Earth. In turn, they function to transmit and express that information inside and outside the cell nucleus—to the interior operations of the cell and ultimately to the next generation of each living organism. The encoded information is contained and conveyed via the nucleic acid sequence, which provides the 'ladder-step' ordering of nucleotides within the molecules of RNA and DNA. Strings of nucleotides are bonded to form helical backbones—typically, one for RNA, two for DNA—and assembled into chains of base-pairs selected from the five primary, or canonical, nucleobases, which are: adenine, cytosine, guanine, thymine, and uracil; note, thymine occurs only in DNA and uracil only in RNA. Using amino acids and the process known as protein synthesis, the specific sequencing in DNA of these nucleobase-pairs enables storing and transmitting coded instructions as genes. In RNA, base-pair sequencing provides for manufacturing new proteins that determine the frames and parts and most chemical processes of all life forms.
  • 1.6K
  • 28 Nov 2022
Topic Review
Natural sulfur containing compounds
The present review aims to characterize the general characteristics, physicochemical properties,and health-related studies of onion, garlic, and cruciferous vegetable consumption, as well as theinfluence of food processing on their content of active substances. The review combines distinctchapters where information relevant for nutraceutical and functional food engineers, medical doctors,as well as consumers can be obtained. We believe that the review will stimulate further studies relatedto the implementation of the most accurate sources of sulfur compounds from chosen plants whichcould support the therapy of cancer patients. Moreover, the review aims to present cost-e ectiveanti-tumor means that would include the implementation in the diet of sulfur-based compoundsin foods.
  • 1.6K
  • 26 Aug 2020
Topic Review
Bound Water and Tissue Stiffness
The mechanical properties of living biological tissues change with aging and commonly can be associated with age-related diseases. Increase of tissue stiffness can be related also with thermodynamically favorable release of tightly bound to biological macromolecules water molecules. 
  • 1.6K
  • 10 Aug 2020
Topic Review
TBC-assisted Cooling Air System Simulation
Thermal barrier coating (TBC) and cooling air systems are among the technologies that have been introduced and applied in pursuing the extensive development of advanced gas turbine. TBC is used to protect the gas turbine components from the higher operating temperature of advanced gas turbine, whereas cooling air systems are applied to assist TBC in lowering the temperature exposure of protected surfaces. Generally, a gas turbine operates in three main operational modes, which are base load, peak load, and part peak load. TBC performance under these three operational modes has become essential to be studied, as it will provide the gas turbine owners not only with the behaviors and damage mechanism of TBC but also a TBC life prediction in a particular operating condition.
  • 1.6K
  • 23 Jun 2021
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