Latest Research News on Microbial Activity: Dec – 2019

Influence of interfaces on microbial activity.

Bacterial adhesion in natural and artificial systems has been critically reviewed to research the influences exerted by the presence of interfaces. various investigations have incontestable  that, within the presence of a solid section, the activity of microorganism cultures is modified. Reviewing relevant literature, 2 issues were encountered. One is of associate degree experimental nature. because of lack of similarity in experimental conditions, disparate experiments usually can’t be compared; their results might even seem conflicting. the opposite drawback is of associate degree interpretational nature: many hypothetic theories exist that try and justify the result of surfaces on microorganism activity. These theories usually confuse changes within the medium and limitations in mass transfer that area unit because of the presence of solid surfaces (indirect influences) with changes in cell properties (direct influences). [1]

Effects of irrigation-induced salinity and sodicity on soil microbial activity

The effects of irrigation-induced salinity and sodicity on the dimensions and activity of the soil microbic biomass in vertic soils on a Zimbabwean sugar estate were investigated. Furrow-irrigated fields were selected  that had a gradient of salinity and sugarcane yield starting from sensible cane growth at the higher ends to dead and dying cane at the lower ends. Soils were sampled beneath dead and dying cane, poor, satisfactory and sensible cane growth and from adjacent undisturbed sites beneath native vegetation. Electrical physical phenomenon (EC) and atomic number 11 sorption quantitative relation (SAR) of saturation paste extracts was measured, further because the exchangeable atomic number 11 proportion (ESP). [2]

Potential use of dehydrogenase activity as an index of microbial activity in degraded soils

Soils from several parts of the Mediterranean region area unit subjected to progressive degradation as a results of erosion by wind and water. As a consequence, the fertility level of those degraded soils is declining. This report studied the dehydrogenase activity of eighteen soils, all of that were subjected to processes of abrasion, so as to establish whether or not such activity might function a marker of the microorganism activity of a degraded soil. The dehydrogenase activity of the soils studied wasn’t correlate with their organic matter content, indicating that total organic matter wasn’t representative of the microorganism activity of degraded soil. [3]

Soil pH, total phosphorus, climate and distance are the major factors influencing microbial activity at a regional spatial scale

Considering the in depth practical redundancy in microbic communities and nice issue in elucidating it supported taxonomical structure, studies on the biology of soil microbic activity at massive spacial scale square measure as vital as microbic community structure. lxxxiv soil samples were collected across an area from south to north China (about one,000 km) to deal with the queries if microbic activity displays biological science patterns and what square measure driving forces. These samples diagrammatical totally different soil varieties, land use and climate. [4]

Physical-chemical Characterization and Microbial Activity of Alternative Substrates for Arugula Cultivation (Eruca sativa Mill.)

Aims: the target of this work was to judge the physical, chemical and biological characteristics of the substrates developed from turn rice husk, industrial sludge, vermiculite, soil and industrial substrate, in addition because the development of garden rocket seedlings genteel within the compositions.

Study Design: Eight treatments were studied in an exceedingly utterly irregular design: TO = industrial substrate (SC); T1= industrial substrate + soil (1SC:1S); T2= industrial substrate + soil + turn rice husk (1SC:1S:1CAC); T3= industrial substrate + vermiculite (1SC:1V); T4= industrial substrate + vermiculite + turn rice husk (1SC:1V:1CAC); T5= sludge + vermiculite (1L:1V); T6= sludge + vermiculite + turn rice husk (1L:1V:1CAC); T7= industrial substrate + sludge + vermiculite + turn rice husk (1SC:1L:1V:1CAC), being carried in box of dilated styrene (PEE) with four replicates. [5]

Reference

[1] van Loosdrecht, M.C., Lyklema, J., Norde, W. and Zehnder, A.J., 1990. Influence of interfaces on microbial activity. Microbiology and Molecular Biology Reviews, 54(1), (Web Link)

[2] Rietz, D.N. and Haynes, R.J., 2003. Effects of irrigation-induced salinity and sodicity on soil microbial activity. Soil Biology and Biochemistry, 35(6), (Web Link)

[3] Garcia, C., Hernandez, T. and Costa, F., 1997. Potential use of dehydrogenase activity as an index of microbial activity in degraded soils. Communications in soil science and plant analysis, 28(1-2), (Web Link)

[4] Soil pH, total phosphorus, climate and distance are the major factors influencing microbial activity at a regional spatial scale
Haichuan Cao, Ruirui Chen, Libing Wang, Lanlan Jiang, Fen Yang, Shixue Zheng, Gejiao Wang & Xiangui Lin
Scientific Reports volume 6, (Web Link)

[5] M. B. Bohm, G., M. Schwanz, S., L. Lanius, S., B. de Moraes, E. and Morsele, T. (2018) “Physical-chemical Characterization and Microbial Activity of Alternative Substrates for Arugula Cultivation (Eruca sativa Mill.)”, Asian Journal of Soil Science and Plant Nutrition, 2(3), (Web Link)

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