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Background:Novel coronavirus disease 2019 (COVID-19) is an infectious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Thorough knowledge about its spread and symptoms, perceptions towards disease and practices to prevent its occurrence are essential. The goal of this study is to assess the knowledge, perceptions and practices of the Bangladeshi residents towards the COVID-19.Methods:A cross-sectional, web-based, pre-tested questionnaire was designed emphasized on the demographic profile, knowledge and perceptions about cause, transmission, prevention and cure of COVID-19. The questionnaires were distributed to 8 districts of Bangladesh only. The survey consists of close ended questions and took approximately 15 minutes to complete during the period of 20th March to 20th April 2020.Results:A total of 320 completed the study questionnaire, including (67.5%) men and (32.5%) women, and most of them are age range 31-50 years (80.00%). 87.19% people knew cause of COVID-19 is viral and 48.75% knew it spreads through coughs. 77.81% people correctly knew about symptoms of COVID-19. 70.00% mentioned all the correct preventive methods as wearing face mask, vaccination, avoid mass gatherings and maintaining hand hygiene. In reality, only 40.00% people exclusively practicing hand hygiene. Conclusions:In general, Bangladeshi population participating in our survey had good knowledge about COVID-19, and a positive attitude towards using protective measures, which is important to limit the spread of the disease.
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Algal spores respond to many environmental variables, especially to chemical "cues". This chemotactic response can be utilized to attract spores, thereby colonization of a new substrata is possible to be influenced. In this attempt, four chemoattractant candidates were screened against spores of Ulva pertusa to reveal their efficiencies. Attachment and subsequent germination of Ulva spores were effectively influenced by these chemoattractant candidates. In particular 100 microg cm2 of D-glucose coating was found to enhance spore attachment by > 150%. Furthermore, field investigations carried out with test panels, clearly indicate the chemoattractive properties of test coatings. In recent years, various anthropogenic activities and natural hazards cause detrimental impacts on the benthic algae and other fishery resources. Artificial reefs have been laid on many coastal regions to increase or restore marine resources. Chemoattractant coatings can be applied on artificial surfaces to increase the colonization of benthic forms. It also can be used in the mariculture devices. Influence of chemoattractants on Ulva spores and fouling biomass estimated on test panels are discussed.