This issue consists of 7 articles from 15 authors affiliated with 8 institutions from 4 countries including:

• Nigeria (Federal University of Technology, Enugu State University of Science and Technology)
• Indonesia (Universitas Pendidikan Indonesia, Universitas Sultan Ageng Tirtayasa)
• Malaysia (Universiti Teknologi Malaysia)
• Uzbekistan (Termez Institute of Engineering and Technology, National University of Uzbekistan, Urgench State University)

Articles

Metabolic Disequilibrium: A Review in the Indication of Soil Ecosystem Insulted with Xenobiotics

M. M. Ebulue

Biosorption/Precipitation of Heavy Metals by Partially Degraded Keratin/Soluble Peptides/Amino Acids By-Products of Degradation of Human Hair by Keratinase Isolated from Alcaligenes Faecalis Strain AIR10

Ezenwali Moses Obinna

Literature Review: Accidents in the Material and Construction Industry

Nurhana Abd Wahab, Nik Hasnaa Nik Mahmood, Asnul Dahar Minghat

Bibliometric Data Analysis of Research on Resin-Based Brake-Pads from 2012 to 2021 using VOSviewer Mapping Analysis Computations

Asep Bayu Dani Nandiyanto, Dwi Fitria Al Husaeni, Risti Ragadhita

Improvement of the Technology of Industrial Wastewater Treatment in the Mining Industry

Panjieva Muqaddas Baxodir Qizi, Shukurov Jurabek Lolayevich

Past, Current and Future Trends of Salicylic Acid and its Derivatives: A Bibliometric Review of Papers from The Scopus Database Published from 2000 to 2021

Abrorbek Ruzmetov, Aziz Ibragimov

Apparatus for the use of Zeolite as an Adsorbent in the Pressure Swing Adsorption (PSA) Technology for Oxygen Concentrator

Yunus Bahari, Sri Agustina, Teguh Kurniawan