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  • 1
    Online Resource
    Online Resource
    Tracking of chloramphenicol, erythromycin, and sulfamethoxazole antibiotic-resistant bacteria from untreated wastewater effluents to receiving river
    Maad Rayan Publishing Company ; 2019
    In:  Environmental Health Engineering and Management Vol. 6, No. 2 ( 2019-06-27), p. 89-96
    Details
    In: Environmental Health Engineering and Management, Maad Rayan Publishing Company, Vol. 6, No. 2 ( 2019-06-27), p. 89-96
    Abstract: Background: The aim of this study was to investigate the frequency and type of bacteria resistant to chloramphenicol (CHL), erythromycin (E), and sulfamethoxazole (SXT) antibiotics from untreated wastewater effluents to receiving river. Methods: In total, 32 samples were taken from eight sites located in the raw wastewater to the downstream of the receiving Ghotor river in Khoy city. Resistant microorganisms were studied through modified HPC method and CLSI standards. Different and specific colonies were selected and re-cultured in R2A culture medium and enough colonies were used for DNA extraction. Bacterial 16sr RNA target gene was amplified and sequenced. Pseudomonas sp., Comamonas sp., and Thiobacillus sp. were predominant bacterial species identified in water samples. Also, antibiotic-resistant genes (ARGs) including sul1, ermB, and cmlA1 were tracked by PCR. Results: The average total number of antibiotic-resistant bacteria (ARB) increased in the downstream (2.4×102 to 2.6×104 CFU/100 mL). The comparison of the results related to the river’s upstream and downstream also indicated a significant difference between ARB and ARGs contents (P 〈 0.05). The average number of bacteria resistant to SXT, E, and CHL antibiotics was obtained to be 2.3×104 , 2.3×104 , and 3.4×104 CFU/mL, respectively. Finally, the evaluation of water revealed that only the aeration lagoon was able to decline the number of CHL-resistant bacteria (88.9%) while this process increased the number of SXT- (51%) and E- (16%) resistant bacteria. The lowest and highest percentages of the identified genes were related to ermB (12.5%) and sul1 (81.25%), respectively. Conclusion: According to the results, wastewaters play an important role in releasing ARB and their antibiotic resistance genes to downstream of Ghotor rivers in Khoy city.
    Type of Medium: Online Resource
    ISSN: 2423-3765 , 2423-4311
    URL: Article
    DOI: 10.15171/EHEM.2019.10
    Language: English
    Publisher: Maad Rayan Publishing Company
    Publication Date: 2019
    detail.hit.zdb_id: 2851629-1
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  • 2
    Online Resource
    Online Resource
    The role of informal recycling in the spreading of COVID-19
    Maad Rayan Publishing Company ; 2020
    In:  Environmental Health Engineering and Management Vol. 7, No. 3 ( 2020-09-20), p. 217-218
    Details
    In: Environmental Health Engineering and Management, Maad Rayan Publishing Company, Vol. 7, No. 3 ( 2020-09-20), p. 217-218
    Type of Medium: Online Resource
    ISSN: 2423-3765 , 2423-4311
    URL: Article
    DOI: 10.34172/EHEM.2020.25
    Language: English
    Publisher: Maad Rayan Publishing Company
    Publication Date: 2020
    detail.hit.zdb_id: 2851629-1
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  • 3
    Online Resource
    Online Resource
    Chemical analysis of essential oils of Thymus Carmanicus Jalas by gas chromatography-mass spectrometry and toxicity activity agains t the major Iranian malaria vector, Anopheles Stephensi
    SCI AND TECH UNIVERSAL INC ; 2023
    In:  Analytical Methods in Environmental Chemistry Journal Vol. 6, No. 01 ( 2023-03-28), p. 69-78
    Details
    In: Analytical Methods in Environmental Chemistry Journal, SCI AND TECH UNIVERSAL INC, Vol. 6, No. 01 ( 2023-03-28), p. 69-78
    Abstract: In the last few years, using chemical insecticides to control the malaria vector has caused environmental pollution and resistance to chemical insecticides. This study aimed to investigate the chemical analysis of essential oils of Thymus carmanicus Jalas by gas chromatography and mass spectrometry (GC-MS) and toxicity activity against the major Iranian malaria vector, Anopheles stephensi. The essential oil of Thymus carmanicus Jalas was prepared from dried leaves using the hydro-distillation method. Gaschromatography-mass spectrometer (GC-MS) was used to analyze and identify thyme essential oil compounds. Bioassay was performed using World Health Organization (WHO) standard test. The T. Carmanicus Jalas essential oil consisted of 15 compounds, with Carvacrol (61%), Thymol (6%), and β-caryophyllene (5%) being the major components by volume. The LC50 and LC90 of thyme oil were 20.37 and 41.38 ppm at 24h after application, respectively. At 24h after application, significant differences were observed between the toxicity of 5%, 20%, 25%, 40%, 50%, and 80% concentrations of Thyme essential oil (P 〈 0.05). The 80% concentration of Thyme essential oil exhibited 100% toxicity against A.stephensi larvae at 24h after application. T. Carmanicus has a rich source of bioactive compounds for use as a mosquito larvicide.
    Type of Medium: Online Resource
    ISSN: 2645-5382 , 2645-5552
    URL: Article
    DOI: 10.24200/amecj.v6.i01.225
    Language: Unknown
    Publisher: SCI AND TECH UNIVERSAL INC
    Publication Date: 2023
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  • 4
    Online Resource
    Online Resource
    Experience of Implementing Water Safety Plan in Iran: A Systematic Review
    Knowledge E DMCC ; 2021
    In:  Journal of Environmental Health and Sustainable Development ( 2021-06-27)
    Details
    In: Journal of Environmental Health and Sustainable Development, Knowledge E DMCC, ( 2021-06-27)
    Abstract: Introduction: The water safety plan is a systematic approach that aims to ensure the quality of water distributed to consumers. In 2004, the World Health Organization issued a statement implementing the water safety plan. The plan is underway in Iran. The purpose of this study is to review the studies conducted from 2004 to 2020. Materials and Methods: Present article is a systematic review study to search for keywords in a combination of "water safety plan" (WSP), "Iran", "Hazard Analysis and Critical Control Points", (HACCP) and "water" in international databases including: PubMed, Science Direct, Google Scholar, as well as national databases include: Magiran and SID. Results: In the initial search, 671 articles were found that after screening based on the Prisma checklist, 15 articles were included in the study for further review. The results showed that in the implementation of WSP, the highest score is related to Qom city with 68.64% and the lowest value is related to Khoy city with 17.5%. Improvement and upgrade program, support program development, and review of WSP courses have received less attention. Low staff familiarity with WSP, insufficient team composition and lack of coordination between them in holding regular meetings can be the reason for poor implementation of WSP in Iran. Conclusion: The full implementation of the water safety plan controls the risks in the water supply system and reduces costs, as well as improves and increases the quality of water distributed to consumers.
    Type of Medium: Online Resource
    ISSN: 2476-7433 , 2476-6267
    URL: Article
    DOI: 10.18502/jehsd.v6i2.6536
    Language: Unknown
    Publisher: Knowledge E DMCC
    Publication Date: 2021
    detail.hit.zdb_id: 2911666-1
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