Affecting Factors of Soil Microorganisms and Their Research Prospects
Wang Lide,
Wu Chunrong,
Song Dacheng,
Wang Jia,
He Hongsheng,
Guo Chunxiu,
Wang Fangling
Issue:
Volume 7, Issue 3, September 2021
Pages:
74-79
Received:
4 July 2021
Accepted:
19 July 2021
Published:
24 July 2021
Abstract: There are many factors affecting the uncertainty of soil microorganisms. This paper aims at reviewing the influencing factors and research progress of soil microorganisms, such as bacteria, fungi and actinomycetes, soil microbial biomass, such as microbial biomass carbon, microbial biomass nitrogen and microbial biomass P, in the ecological distribution of Soil microbes has been discussed from the aspects of time, space and plant communities etc., focused on effects of natural factors including soil moisture, soil temperature, soil PH, soil nutrients, soil salinity, etc. and artificial measures including fertilization and spraying rare earth elements, grazing, different utilization and tillage practices, crop rotation, burning, fencing, tourism trampling, soil pollution, etc. on soil microbial. Although there are many reports about soil microbiology, overall it is still limited. And look into the distance for future research by combining with our project team for many years of work.
Abstract: There are many factors affecting the uncertainty of soil microorganisms. This paper aims at reviewing the influencing factors and research progress of soil microorganisms, such as bacteria, fungi and actinomycetes, soil microbial biomass, such as microbial biomass carbon, microbial biomass nitrogen and microbial biomass P, in the ecological distrib...
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Rivers’s Postulates Fulfilled for Blue Catfish Alloherpesvirus
Vandana Dharan,
Suja Aarattuthodi
Issue:
Volume 7, Issue 3, September 2021
Pages:
80-84
Received:
2 November 2021
Accepted:
18 November 2021
Published:
24 November 2021
Abstract: Blue catfish alloherpesvirus (BCAHV) is a strain of ictalurid herpesvirus-1 belonging to the family Alloherpesviridae. A detailed study on the pathogenesis of this virus revealed that it causes significant mortalities in blue catfish fingerlings and could be problematic with hybrid catfish production. The genome of BCAHV has 94% similarity with channel catfish virus (CCV) and these herpesviruses are a major threat to the hatchery and nursery phases of fish production. Even though, several studies have been caried out regarding the virulence, immune responses, and factors influencing infection, Rivers’s postulates have not been verified for BCAHV infection so far. Validation of Rivers’s postulates is essential to confirm virus as the causative agent of a disease. Testing and verification of Rivers’s postulates are also essential to decide on treatments or while establishing proactive management strategies. In the current study, we tested Rivers’s postulates to validate BCAHV as the etiologic agent of the infection in blue catfish fingerlings. The infected blue catfish tissues were processed, filtered, inoculated onto channel catfish ovary (CCO) cells, and virus-specific cytopathic effects were observed. The cell culture propagated-BCAHV produced comparable infection in naïve blue catfish when exposed via immersion and was reisolated from the infected fish. Specific immune responses against BCAHV were observed, when survivors from an initial virus exposure were challenged with wild type virus after 45 days. Here, Rivers’s postulates were satisfied for BCHAV infection in blue catfish proving BCAHV as the etiological agent of infection.
Abstract: Blue catfish alloherpesvirus (BCAHV) is a strain of ictalurid herpesvirus-1 belonging to the family Alloherpesviridae. A detailed study on the pathogenesis of this virus revealed that it causes significant mortalities in blue catfish fingerlings and could be problematic with hybrid catfish production. The genome of BCAHV has 94% similarity with cha...
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