Microbiology articles list

This paper examines Nigerian students’ perception or approach to libraries. It cuts across the primary, secondary and tertiary institutions. The reason for the laxity in library real time usage is the primary driving force that led to the research. The research method adopted for this study was longitudinal method to get the right place of the actual issues without official cover-ups where necessary. Secondary data were also used to buttress the position of the research. The population approached for the longitudinal method was randomly picked at the different levels of schools. Parents were also in place at some point to drive home the true intent they have about their children and the use of libraries. Findings revealed that seeming laxity of both undergraduate and graduate students’ perception and attitude about the library is primarily because of the lacuna in their other levels of education before coming to the university. This served as a useful yard stick for the researchers developing workable recommendations that in their opinion will be of immense help to solving it. Index Terms— Library Knowledge, Nigerian Student, Primary School Library, Secondary School Library, Tertiary Library.

Emmanuel Musa

Industrial waste is one of the most essential sources of contamination in the environment. Chromium (Cr) is a toxic heavy metal, a major contaminant in tannery wastes and its accumulation in soil and water is a major environmental concern today. In the present study, an attempt was made and investigated the status of different beneficial microbes particularly plant growth promoting rhizobacteria (PGPR) from tannery sludge samples collected from tannery effluent treatment plant at Dindugal, Tamil Nadu, India. Experiments were conducted and evaluated their chromium heavy metal tolerance abilities and plant growth promoting activities under in-vitro. Based on molecular analysis, the PGPRs were identified as Achromobacter xylosoxidans (LK391696), Azotobacter vinelandii (LK391702) and. The production of IAA was found to be high by Achromobacter xylosoxidans (46μg/ml) followed by Azospirillum lipoferum (30μg/ml). Phosphate solublization activity was also found to be positive in all these PGPR isolates. Significance of these results revealed that there is a possibility of using these potential PGPRs for bioremediation of chromium contaminated sites and also as good plant growth promoter.

Dr. SARANYA DEVI K

Industrial waste is one of the most essential sources of contamination in the environment. Chromium (Cr) is a toxic heavy metal, a major contaminant in tannery wastes and its accumulation in soil and water is a major environmental concern today. In the present study, an attempt was made and investigated the status of different beneficial microbes particularly plant growth promoting rhizobacteria (PGPR) from tannery sludge samples collected from tannery effluent treatment plant at Dindugal, Tamil Nadu, India. Experiments were conducted and evaluated their chromium heavy metal tolerance abilities and plant growth promoting activities under in-vitro. Based on molecular analysis, the PGPRs were identified as Achromobacter xylosoxidans (LK391696), Azotobacter vinelandii (LK391702) and. The production of IAA was found to be high by Achromobacter xylosoxidans (46μg/ml) followed by Azospirillum lipoferum (30μg/ml). Phosphate solublization activity was also found to be positive in all these PGPR isolates. Significance of these results revealed that there is a possibility of using these potential PGPRs for bioremediation of chromium contaminated sites and also as good plant growth promoter.

Dr. SARANYA DEVI K

Avian influenza has impacted negatively on poultry production in Nigeria. The aim of this study was to determine the status of avian influenza virus (AIV) antibodies in wild birds to provide early warning of an outbreak. One hundred and forty-six sera from five different species of wild birds were tested for antibodies to avian influenza A viruses (H5 and H9) using enzyme linked immunosorbent assay and haemagglutination inhibition (HI) tests. An overall seroprevalence of 3.4% (5/146) was recorded in the study area. Seroprevalence of 6.67% (2/30) was recorded in speckled pigeons (Columba guinea) and Village weavers (Ploceus cucullatus) respectively and 3.33% (1/30) in Cattle egrets (Bubulcus ibis). No antibodies were detected in laughing doves (Spilolepia senegalensis) and African silver bill (Euodice cantans). The serological detection of AIV subtypes H5 and H9 by HI showed the exposure of these birds to the two subtypes. The result from this study indicates evidence of the presence of H5 and H9 AI viruses in wild birds in Zaria, Kaduna State. Therefore, comprehensive surveillance of influenza A involving wild birds’ population and H5 as well as H9 subtype is recommended. This is necessary in order to know the actual status of these strains in the poultry population in Nigeria in view of their zoonotic and economic importance.

Bitrus Inuwa

Since 2006, multiple outbreaks of avian influenza (AI) have been reported in Nigeria involving different subtypes. Surveillance and molecular epidemiology have revealed the vital role of live bird markets (LBMs) in the dissemination of AI virus to commercial poultry farms. To better understand the ecology and epidemiology of AI in Nigeria, we performed whole-genome sequencing of nineteen H9N2 viruses recovered, from apparently healthy poultry species, during active surveillance conducted in nine LBMs across Nigeria in 2019. Analyses of the HA gene segment of these viruses showed that the H9N2 strains belong to the G1 lineage, which has zoonotic potential, and are clustered with contemporary H9N2 identified in Africa between 2016 and 2020. We observed two distinct clusters of H9N2 viruses in Nigeria, suggesting different introductions into the country. In view of the zoonotic potential of H9N2 and the co-circulation of multiple subtypes of AI virus in Nigeria, continuous monitoring of the LBMs across the country and molecular characterization of AIVs identified is advocated to mitigate economic losses and public health threats.

Bitrus Inuwa

Influenza A virus presents a significant public health burden worldwide, with the 1918 Spanish flu pandemic being the most dramatic example. Swine influenza viruses can be transmitted to humans through occupational exposures and in live pig markets. Novel variants can emerge in pigs because they can be infected by human, avian and swine strains. This study was carried out to determine the seroprevalence and serotypes of swine influenza in pigs from a major slaughter slab in southern Kaduna. Using competitive ELISA and haemagglutination-inhibition (HI) assays, 305 swine sera were analysed. The result showed an overall seroprevalence of 28.20% (n=86), with H3N2 7.87% (n=24) emerging as the most dominant subtype in circulation. Concurrent antibody detection of H1N1 in 5.26% (n=16) was also detected in boar 2.62% (n=8) and sows 2.62% (n=8). This study revealed swine Influenza H1N1 and H3N2 serotypes are in circulation in pigs in Kaduna State, and that reassortment in the instance of co-infection of swine host is possible.

Bitrus Inuwa

Newcastle Disease Virus (NDV) constitutes a major constraint to the poultry production system in Nigeria. This study was carried out to investigate the seroprevalence of NDV antibodies in local chickens (Gallus domesticus) slaughtered in five different live bird markets (LBMs) in Kaduna metropolis, Nigeria. Three hundred blood samples were collected and screened for antibodies against NDV using Haemagglutination Inhibition (HI). An overall seroprevalence rate of 23% (95%:CI18.5-28.0) was recorded in this study. Seroprevalence based on different LBMs revealed a higher prevalence of 28.3% (95% : Cl 18.0-40.7) in Sabo market, followed by Sokoto road market 26.7% (Cl:16.7-38.9), Kawo market 18.3% (95% Cl: 10.0-29.6), Railway market 13.3% (Cl:6.4-23.5), and the lowest prevalence was recorded in central market 11.7% (Cl:5.2-21.7). The difference in seroprevalence among the LBMs was not statistically significant (p > 0.05). Higher seroprevalence of NDV antibodies in female birds 30.5 % (Cl: 24.1-37.6) was recorded compared to male 13.9% (Cl: 8.3-21.4). The study indicated that NDV is endemic in the population. LBMs location had no significant influence on the seroprevalence of NDV in the study area. The difference in seroprevalence between sexes was statistically significant (p < 0.05). Therefore, this study demonstrated the need for a regular strategic vaccination programme against NDV in local chickens in Kaduna metropolis.

Bitrus Inuwa

Infectious bronchitis (IB) is one of the most common highly infectious viral respiratory diseases of poultry having wide geographical distribution. Yet, little is known about the infection in the northwestern states of Nigeria. In this study, a total of 263 pooled cloacal and tracheal swab samples were collected from apparently healthy avian species (duck, dove, geese, guinea fowl, local chicken, ostrich, parrot, pigeon, peacock, and turkey). The samples were from nine live bird markets in three states (Kaduna, Kano and Jigawa) of northwestern, Nigeria collected from September through November 2017. Total RNAs were extracted directly from the swab samples and screened for infectious bronchitis virus (IBV) using real-time reverse transcription-polymerase chain reaction. An overall prevalence of 38.0% (100/263) was recorded. IB was detected in 70 % (7/10) of the avian species with prevalence of 100 % in dove, local chicken 45.9 %, duck 42.3 %, geese 26.6 %, pigeon 23.5 %, turkey 20.0 % and guinea fowl 6.2 %. Conversely, no detection was made from ostrich, parrot, and peacock. Widespread distribution of IBV was observed and evidence of subclinical infection in seven out of ten (70 %) of the avian species sampled. These avian species harbouring IBV may act as reservoirs with an influence on the ecology and epidemiology of the disease. Continuous surveillance and characterization of the different serotypes in avian species are recommended to inform the adoption of suitable vaccination strategy and control measures for the disease in Nigeria.

Bitrus Inuwa

The control of highly pathogenic avian influenza (HPAI) in Nigeria from inception is predicated on effective biosecurity by stamping out policy but outbreaks of the disease continued to re-occur with altered clinico-pathologic manifestations. This study undertook the qualitative assessment of the clinico- pathological features of HPAI H5N1 during the 2021/2022 outbreaks in commercial poultry and peri-domestic birds in northern Nigeria. A total of 22 commercial poultry farms with 53,932 laying chickens and 3 households with 120 backyard broiler chickens, 18 indigenous chickens, 10 peafowls and 9 geese were investigated for HPAI. The clinico-pathologic manifestations observed in commercial poultry were subtle compared to previous presentations of the disease except in the peafowls, geese, broilers and indigenous chickens. The interspecies mortality rates significantly varied from 1.6% to 19.6% for laying chickens and 33.3% to 100% for broilers, indigenous chickens, geese and peafowls. Based on the history of sudden and high mortality, clinical signs and post mortem lesions observed, three diseases; HPAI, very virulent Newcastle disease and fowl cholera were drawn out as differential diagnoses. However, a tentative diagnosis of HPAI was made and samples were sent to the National Veterinary Research Institute, Vom, Plateau State, Nigeria for confirmatory diagnosis. Results of the laboratory tests conducted on the samples using one step flu A screening and duplex real time RT-PCR and virus isolation in embryonated chicken eggs confirmed HPAI H5N1 in twenty-five farms. It is concluded that the continuous though, irregular outbreaks of HPAI and emerging clinico-pathologic manifestations are pointers to failure of control and that the disease may become endemic. It is recommended that government should review its policy on the control of HPAI to include the adoption of zoned vaccination with close monitoring.

Bitrus Inuwa

Background and Objective: Endophytic bacteria can protect host plants by producing secondary metabolites and also improve host plant growth by various mechanisms. This unique character makes a special role in, using endophytic bacteria in sustainable agriculture. The study aims to isolate endophytic bacteria from Azadirachta indica (neem) leaf and screened for their biocontrol and plant growth-promoting properties. Materials and Methods: Totally 13 endophytic bacteria isolated from neem leaf and it was tested for their in-vitro antifungal activities against Rhizoctonia solani. A total of 3 isolates (N1B, N4B and N5B) were selected on the broad antifungal activity (50%, 56%, 75% mycelial inhibition). Among different solvents used for the extraction of secondary metabolites from endophytic bacteria, only ethyl acetate extract of N5B showed maximum zone of inhibition in well diffusion method against fungal pathogen. Results: The GC-MS analysis of ethyl acetate extracts of N5B exhibited 14 compounds with antifungal activity, such as Dimethoxyglycerol docosyl ether, Pentadecanoic acid, Oleic acid etc. Selected 3 endophytic isolates were identified up to molecular level using 16S rRNA sequencing and it was identified as Bacillus haynesii, Stenotrophomonas maltophilia and Pseudomonas aeruginosa. The identified isolates were used for nursery experiments based on their strong in-vitro antifungal and PGP activities such as P, K, and Zn solubilization, N fixation, IAA, HCN and EPS production. Conclusion: The tested bacterial isolates significantly decreased disease severity in rice, infected with R. solani and increased plant biomass when compared with un-inoculated control. Our findings suggested above mentioned 3 bacterial species may be promising candidates as a biocontrol agent to confer resistance to sheath blight disease of rice.

Dr. SARANYA DEVI K

Bacteria that colonize plant roots and enhance the plant growth are denoted as Plant Growth Promoting Rhizobacteria (PGPR). The objective of this study is to isolate and identify Oryza sativa indigenous rhizobacteria and test for its, bio-control and various plant growth promoting traits under in-vitro condition. Nine rhizobacterial colonies isolated from healthy rice rhizosphere soil were screened for bio-control activity against rice pathogen Helminthosporium oryzae (rice brown spot) and Rhizoctonia solani (sheath blight) by performing dual culture method. The isolate B9 showed maximum antagonism against R. solani (73.7%) followed by isolate B2 (51.2%), isolate B1 (47.5%) and isolate B5 (42.5%) with different range of mycelial inhibition. Among nine rhizobacterial isolates tested, the growth of pathogenic fungi H. oryzae was only inhibited by the isolate B9 (20.5%). The isolates B1, B2, B5 and B9 exhibited maximum bio-control activities were further screened for different PGP traits, such as Phosphate (P) solubilization, Indole-3-Acetic Acid (IAA) production, Hydrogen Cyanide production (HCN) and extracellular enzyme production under in-vitro condition. The isolate B9 revealed the maximum P solubilization efficiency (99 SE), 45 μg/ml of IAA, HCN, amylase and cellulase production in maximum amount. The isolate B9 exhibited maximum bio-control, and PGP traits were identified by morphological and biochemical characterization and it was identified as Bacillus subtilis. In pot experiment, the rice seeds treated with B. subtilis exhibited significant shoot and root biomass when compared with un-inoculated rice and fungus-infected rice. This study highlighted the beneficial properties of native PGPR’s on growth promotion of rice and it could be formulated as bio-control as well as plant growth promoting agent, to reduce the application of chemical fertilizers in agricultural lands.

Dr. SARANYA DEVI K

Use of chemical fungicide to control plant diseases causes several adverse effects such as, development of resistance in the pathogen, residual toxicity, pollution to the environment etc. So an alternative way to overcome the usage of dreadful chemicals is very important. The use of plant extracts as biofungicide is one of the popular and effective method. Araucaria columnaris is a commonly seen ornamental plant known as Christmas tree. It’s a South African species, under the family Araucariaceae. Hence, in the present study, the plant resin extract was tested in-vitro against major plant pathogensby preliminary bioassay. It was found that up to 95% reduction of mycelium growth was observed against major phytopathogens such as Fusarium oxysporyum, Rhizoctoniasp, Cylindrocladiumsp, Alternariasp, and Colletrotricum sp., causing tomato wilt, damping off, foliage blight, and leaf blight diseases in economically important plants. Up to our knowledge it is the first report showing the antifungal activity of Araucaria columnaris resin as antifungal agent. By using this valuable tree, further work will be done to formulate commercial biofungicide.

Dr. SARANYA DEVI K

Industrial waste is one of the most essential sources of contamination in the environment. Chromium (Cr) is a toxic heavy metal, a major contaminant in tannery wastes and its accumulation in soil and water is a major environmental concern today. In the present study, an attempt was made and investigated the status of different beneficial microbes particularly plant growth promoting rhizobacteria (PGPR) from tannery sludge samples collected from tannery effluent treatment plant at Dindugal, Tamil Nadu, India. Experiments were conducted and evaluated their chromium heavy metal tolerance abilities and plant growth promoting activities under in-vitro. Based on molecular analysis, the PGPRs were identified as Achromobacter xylosoxidans (LK391696), Azotobacter vinelandii (LK391702) and. The production of IAA was found to be high by Achromobacter xylosoxidans (46μg/ml) followed by Azospirillum lipoferum (30μg/ml). Phosphate solublization activity was also found to be positive in all these PGPR isolates. Significance of these results revealed that there is a possibility of using these potential PGPRs for bioremediation of chromium contaminated sites and also as good plant growth promoter.

Dr. SARANYA DEVI K

The beneficial medicinal effects of plant materials typically result from the secondary products present in the plant although, it is usually not attributed to a single compound but a combination of the metabolites. The medicinal actions of plants are unique to a particular plant species or group, consistent with the concept that the combination of secondary products in a particular plant is taxonomically distinct.The screening of plants usually involves several approach; ethno botanical approach is one of the common methods that are employed in choosing the plant for pharmacological study. In the present review paper, antimicrobial properties of various medicinal plants were reviewed. The present review deals with the antibacterial activity of various medicinal plants.

Tapan kumar Mahato

Fungal infection of the nails (onychomycosis) is a common condition that is hard to cure. The fungus hidden in the nail is difficult to treat with antifungal medications, and infected nails take months to heal. Antifungal nail polish can occasionally be used to treat mild cases, but blood-stream-permeable medications are required to treat more serious infections. We need something better because even these are not always successful and can have negative side effects like skin rash or liver issues. Additionally, onycholysis (the separation of the nail plate) creates a moist environment that can encourage the growth of fungi. Moreover, immunosuppressive medication use may worsen onychomycosis. In this example, the diseased entity's clinical presentation in an adult patient was described.

Mediterranean Journal of Pharmacy and Pharmaceutical Sciences

Around the world, several oral health measures have been implemented. The most popular method is to use a toothpaste. However, chewing sticks are still used in many cultures around the world in a conventional manner. Chewing sticks have a mechanical cleansing action similar to a toothbrush in addition to their antimicrobial effect. The purpose of this study is to evaluate the effect of Miswak on the growth of Candida species and to compare it to that of toothpaste. A cross-sectional study was carried out on 120 selected randomly volunteers from January to April, 2022. Two groups of participants were used for two weeks. The participants were separated into a group used Miswak and a group use ordinary toothpaste. Samples were collected before and after two weeks in these two groups. Samples were immediately processed for microbiological phenotypic conventional methods and in vitro susceptibility testing of the microbial isolates to antimicrobial. The findings show that a significant effect of Miswak against an oral cavity candida species. Total candida count was 27.5 ± 18.48, P = 0.001 (Mean ± SD) from Miswak group and 247.0 ± 90.14, P = 0.979 (Mean ± SD) in toothpaste group. The most frequent Candida isolates organisms were C. albicans: 22 (36.67%) in the Miswak group and 24 (40.0%) in the toothpaste group, the second isolate was C. dubliniensis: 04 (6.69%) in the Miswak group and 12 (20.0%) in toothpaste group followed by C. glabrata: 02 (3.33%) in Miswak group. In conclusion, Miswak has a considerable antifungal impact immediately and after two weeks of use.

Mediterranean Journal of Pharmacy and Pharmaceutical Sciences