Cultural populations

Rosencrantz D, Rainey FA, Janssen PH. 1999. Culturable populations of Sporomusa spp. and Desulfovibrio spp. in the anoxic bulk soil of flooded rice microcosms. Appl Environ Microbiol 65 3526-33. 

Measurements by Thompson et al. (1978) on cultured populations of phytoplankton, such as might be expected to scatter light in ocean waters, revealed only a scattering matrix of the form (13.5), characteristic of particles for which either the Rayleigh (Chapter 5) or Rayleigh-Gans (Chapter 6) approximations are valid. 

Pure Yeast Culture. Recheck population periodically for purity. If a wild yeast population builds up significantly, discard the culture and begin again from a slant. Some wineries are using mass pitching techniques with dry or frozen yeast very successfully. This eliminates the need for any monitoring of culture population. Wild yeasts often cause unreliable and erratic fermentation rates, and this is often accompanied by off odors and off flavors in the wine. Erratic fermentations also often invite bacterial contamination. 

Low-density cultures (populations that reach 5 x 106cells/mL) will require fresh nutrient media less frequently than high-density (2 x 107 cells/mL) cultures. A change in the color of the medium from orange to yellow indicates that the medium requires to be changed. 

Bolgova, O.M., Sidorov, V.S. and Smirnov, Yu.A. (1976). Fatty acid composition of muscles of salmon fry in natural and cultured populations (In Russian). In Salmonidae of Karelia , pp. 163-167. Petrozavodsk. 

Silk fabric and thread are derived from the cocoons that some insects make as part of their metamorphosis from caterpillar to butterfly or moth. Most commercial silk is created by Bombyx mori, a small moth that was originally native to Asia. These animals no longer live in the wild, and in cultured populations they have lost their ability to fly. 

Koski et al. (2005) Grazing M Cultured populations (colonies + cells) Single cells... 

Krauk, J., Sohm, J., Montoya, J., ViUareal, T., and Capone, D. G. (2006). Plasticity and limits on N P ratios in Trichodesmium spp. A comparative study between field and cultured populations. Aquat. Microh. Ecol. 42, 243-253. 

MulhoUand, M., and Capone, D. (1999). Nitrogen fixation, uptake and metabolism in namral and cultured populations of Trichodesmium spp. Mar. Ecol. Prog. Ser. 188, 33—49. 

Paerl, H. W., Prufert-Bebout, L. E., and Gou, C. (1994). Iron-stimulated N2 fixation and growth in namral and cultured populations of the planktonic marine cyanobacteria Trichodesmium spp. Appl. Environ. Microbiol. 60, 1044—1047. 

Smith, Z., McCaig, A., Stephen, J., Embley, T., and Prosser, J. I. (2001). Species diversity of uncultured and cultured populations of soil and marine ammonia oxidizing bacteria. Microbial Ecology 42, 228-237. 

Whether taxa in natural bacterioplankton assemblages exhibit similar characteristics to cultured populations largely remains to... 

The time of growth supported by the remaining histidine will depend on the culture population. At a density of 2 x 10 cells/ml (approximately one-tenth the stationary phase density), about 3 minutes of growth at the normal rate would totally exhaust the remaining histidine. 

Effects of Temperature Shift on Growth in Continuous Culture. At the steady state in the continuous culture, the culture population density is maintained constant, and the specific growth rate is equal to the dilution rate, D (the influent volume per hr... 

Later, Ong et al. introduced a method termed SILAC (stable isotope labeling by amino acids in cell). In SILAC, two cell-culture populations are grown under identical conditions, except that one is supplied with the labeled amino acids (e.g. arginine with six atoms) and the other is with the non-labeled. After five or six doublings, two kinds of amino acids have fully incorporated into proteins. Every peptide pair is separated by the mass shift by the labeled amino acid. This approach cannot be applied to tissues or body fluids, and is... 

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