Bacterial biofilms are complex surface attached communities of bacteria held together by self-produced polymer matrixs mainly composed of polysaccharides, secreted proteins, and extracellular DNAs. Bacterial biofilm formation is a complex process and can be described in five main phases: (i) reversible attachment phase, where bacteria non-specifically attach to surfaces; (ii) irreversible attachment phase, which involves interaction between bacterial cells and a surface using bacterial adhesins such as fimbriae and lipopolysaccharide (LPS); (iii) production of extracellular polymeric substances (EPS) by the resident bacterial cells; (iv) biofilm maturation phase, in which bacterial cells synthesize and release signaling molecules to sense the presence of each other, conducing to the formation of microcolony and maturation of biofilms; and (v) dispersal/detachment phase, where the bacterial cells depart biofilms and comeback to independent planktonic lifestyle. Biofilm formation is detrimental in healthcare, drinking water distribution systems, food, and marine industries, etc. As a result, current studies have been focused toward control and prevention of biofilms. In an effort to get rid of harmful biofilms, various techniques and approaches have been employed that interfere with bacterial attachment, bacterial communication systems (quorum sensing, QS), and biofilm matrixs. Biofilms, however, also offer beneficial roles in a variety of fields including applications in plant protection, bioremediation, wastewater treatment, and corrosion inhibition amongst others. Development of beneficial biofilms can be promoted through manipulation of adhesion surfaces, QS and environmental conditions. This review describes the events involved in bacterial biofilm formation, lists the negative and positive aspects associated with bacterial biofilms, elaborates the main strategies currently used to regulate establishment of harmful bacterial biofilms as well as certain strategies employed to encourage formation of beneficial bacterial biofilms, and highlights the future perspectives of bacterial biofilms.

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Due to increase in demand of electricity and high environment hazard cause by fossil fuel in generation electricity, renewable energy (such as solar energy, wind energy and so on) researches are becoming mandatory to researchers especially scientists and engineers and in solar energy generation an electronic device is used to convert energy from sun into electricity which is known as solar photovoltaic cell and the efficiency of this device is improving by improving the materials used in manufacturing it. This paper was aimed to review the status of these materials for solar photovoltaic cell up to date, from the review it was discovered that the materials are classified based on the generations whereby their efficiencies are increasing from first generation to third generation. And the current market is mainly covered by the first two generations. The first generation comprises well-known medium/low cost technologies that lead to moderate yields. The second generation (thin-film technologies) includes devices that have lower efficiency albeit are cheaper to manufacture. The third generation presents the use of novel materials, as well as a great variability of designs, and comprises expensive but very efficient cells. Although there is fourth generation which their performance and stability was yet to be found as the review disclosed.

Serological survey was carried out among children attending Institute of Child Health (ICH) Banzazzau Zaria Kaduna, State, to determine the prevalence of Respiratory Syncytial Virus IgM antibodies. Ninety-one blood samples of children aged 0 clinic of Ahmadu Bello University Teaching Hospital Zaria (ICH Banzazzau). Respiratory s virus IgM antibody level was measured using commercial ELISA kit obtained from DIAGNOSTIC AUTOMATION, INC. Of the ninety seropositive for Respiratory Syncytial Virus. There was male predominan positive compared in females 20 (22.0%) although, the difference was not statistically significant (P value >0.05).The seroprevalence was highest (15.4%) among infants 0 (5.5%) among 3 years old children..The asso symptoms was not statistically significant. Every child who showed seropositivity with the Respiratory Syncytial Virus had fever and no child without a fever was diagnosed positive with the virus. This study has revealed that children aged 0 Zaria, and therefore, highlighting the need for the younger age group to be targeted for prevention programme against RSV infection.