Spectroscopy is a captivating branch of science that examines the interactions between light and matter. By analyzing the way different materials absorb, emit, or scatter light across a range of wavelengths, spectroscopy provides unique insights into the properties and composition of substances. This field has a vast array of applications, from uncovering the molecular composition of distant stars to diagnosing medical conditions.
Spectroscopy encompasses various techniques, each with its own strengths and applications. These techniques include absorption spectroscopy, fluorescence spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, and mass spectrometry. Spectroscopy is a vital tool in fields like chemistry, physics, astronomy, and materials science, offering us a deeper understanding of the building blocks of the universe.
Open Access Policy refers to a set of principles and guidelines aimed at providing unrestricted access to scholarly research and literature. It promotes the free availability and unrestricted use of research outputs, enabling researchers, students, and the general public to access, read, download, and distribute scholarly articles without financial or legal barriers. In this response, I will provide you with an overview of the history and latest resolutions related to Open Access Policy.
byNguyen Thi Huong, Do Ngoc Thuy, Phung Van Trung, Le Ngoc Hung and Mai Van Nam
The medicinal herb Asparagus racemosus has been used in traditional medicine to treat various diseases such as cough, diarrhoea, diabetes, gastric issues, gonorrhoea, headaches, piles, rheumatism, and even lactation enhancement. This study explores the genetic information and phytochemicals of the species native to Gia Lai province, Vietnam before its conservation and cultivation. Five species of A. racemosus were analyzed using the trnL-e/trnL-f regions sequence. A. racemosus roots were extracted by water then Ultra-High-Performance Liquid Chr...omatography coupled with Quadrupole/Time-Of-Flight Mass Spectrometry (UHPLC-Q-TOF-MS) spectroscopy was used to screen for their phytochemicals. We have confirmed the DNA genetics of A. racemosus species collected in Gia Lai, Vietnam. In water extract of A. racemosus roots, UHPLC-Q-TOF-MS tentatively identified two flavonoids (Quercetin-3-glucuronide, Rutin), five steroidal saponins (Shatavarin I, Shatavarin IV, Shatavarin IX, Asparacoside, Asparanin A), and two steroids (β-sitosterol, Daucosterol). The experimental findings confirm the A. racemosus species for conservation and cultivation in Vietnam and contribute the benefits to the chemical literature of Vietnamese natural flora. A. racemosus should be further studied for pharmaceutical activities.
Open Access Policy refers to a set of principles and guidelines aimed at providing unrestricted access to scholarly research and literature. It promotes the free availability and unrestricted use of research outputs, enabling researchers, students, and the general public to access, read, download, and distribute scholarly articles without financial or legal barriers. In this response, I will provide you with an overview of the history and latest resolutions related to Open Access Policy.
Using the superposition model, the crystal field and zero-field splitting parameters of Cr3+ doped cassiterite (tin oxide), SnO2 single crystals are computed. For calculations, the appropriate locations for Cr3+ ions in SnO2 with distortion are taken into account. The experimental values and the zero-field splitting parameters in theory with local distortion agree fairly well. Using the Crystal Field Analysis Program and crystal field parameters, the optical energy bands for Cr3+ in SnO2 are calculated. The findings indicate that in SnO2 single... crystals, one of the Sn4+ ions is replaced by Cr3+ ions.
