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Author Walczak, Maciej ♦ Lake, Eutrophic
Source CiteSeerX
Content type Text
File Format PDF
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Daytonight Activity Bacteria Surface ♦ Cellular Dehydrogenases ♦ Sm Bacteria ♦ Surface Microlayer ♦ Dna Synthesis ♦ Day-night Impact ♦ Subsurface Water ♦ Cell Protein ♦ Significant Impact ♦ Bacteria In-habiting Sm ♦ Protein Synthesis ♦ Bacteria Number ♦ Key Word ♦ Several Dozen Centimetre ♦ Hetero-trophic Bacteria
Abstract ABSTRACT: This study examined changes of bacteria numbers in the surface microlayer (SM) and subsurface water (SW) of a lake during a day- and night-time. The research also address-es the synthesis of DNA and cell protein as well as the activity of cellular dehydrogenases depending on time of the day. Results demonstrated that in spring and summer the numbers of bacteria (per cm3) in the SM was significantly greater during night-time than day-time (average: May, day-time – 30.058 × 106, night-time – 71.343 × 106; July, day-time – 10.801 × 106, night-time – 40.353 × 106). In October, numbers of bacteria in day-and night-time were not statistically different (re-spectively: 5.841 × 106 and 3.664 × 106). Results indicated also that the rate of DNA synthesis by SM bacteria was much higher in the night-time (average: May – 2.049 × 10–6 pg h–1 cell–1; July – 1.363 × 10–6 pg h–1 cell–1), than in the day-time (average: May – 0.7263 × 10–6 pg h–1 cell–1; July – 0.3404 ×10–6 pg h–1 cell–1). In con-trast, in October the values of DNA synthesis by SM bacteria were higher in night-time. These changes are significantly smaller in SW at a depth of several dozen centimetres. However, no significant impact was observed of a time of the day on the activity of protein synthesis and activity of cellular dehydrogenases by bacteria in-habiting SM and SW. KEY WORDS: surface microlayer, hetero-trophic bacteria, day-night impact on bacteria
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study
Learning Resource Type Article