No abstract

Ferula asafoetida is an endemic species in Iran and is rich in oleo-gum resin with high economic value in the world. One important application of F. assafoetida is its traditional use for the management of respiratory ailments. The aim of this review was to collect papers dealing with F. asafoetida oleo-gum resin in respiratory tract’s diseases in modern medicine. For preparing the manuscript the scientific databases (Google scholar, PubMed, Springer, Science Direct, Magiran), books, thesis, etc. were searched using the keywords of “Ferula asafoetida”, “Ferula scorodesma”, “Scorodesma foetida”, “Northex asafoetida” plus “respiratory tract”, "respiratory disorder" “infection”, “cough”, “trachea”, “traditional medicine” up to Feb 2022 and the collected data were summarized, analyzed, and discussed. The results of the investigation confirmed the traditional belief on the efficacy of Ferula asafoetida in the treatment of respiratory viral infection (Coronavirus, influenza), cigarette smoking, asthma, cough and cancer, but most studies were limited to in vitro. There was only one registered randomized, blinded, placebo controlled clinical trial for 300 mg F. asafoetida aqueous extract capsules (three times a day for 14 days) on 40 patients with COVID-19 without any published results. Although, the studies implied the efficacy of F. asafoetida in the treatment of respiratory treatments, but design large clinical studies for evaluating its efficacy and safety is essential in future investigations.

During space missions, the impact of the space conditions (both microgravity and radiation) on phys-iologic and metabolic aspects of the microbiota of astronauts' bodies should be considered. Changes depend on the mission's duration, types of organisms, and ecology. Reported alterations are related to changes in morphology, growth, gene expression, and physiology of cells, resulting in increased virulence, acid, antibiotic resistance, biofilm formation, secondary metabolism, and microbial muta-tions. Accordingly, recent research indicates the impacts of simulated microgravity on human physi-ology and bacterial characteristics. This paper has reviewed the aspects of microgravity on changes in microbiota, including virulence, antibiotic resistance, and gene expression. Microgravity can under-mine humans and makes influence bacterial pathogenicity. The review of papers shows that some mi-croorganisms showed higher pathogenicity under microgravity conditions. Moreover, sulfamethoxa-zole had the highest resistance among Gram-positive microorganisms, and gentamicin had the highest resistance in Gram-negative bacteria. All antibiotics reviewed under microgravity conditions were robust in both groups of microorganisms compared to the gravity condition. Furthermore, some gene expression was altered in bacteria under microgravity conditions compared to Earth conditions (standard bacterial growth conditions). Changes in microbial behavior under microgravity directly influence astronauts' health conditions, and a detailed analysis of known facts can provide essential information for the selection of appropriate probiotics for these specific cases during the missions and after the recovery processes. Moreover, the study of microorganisms changes in the absence of grav-ity will help to understand the mechanisms of causing diseases on Earth and may be applied in clini-cal practice.