气液双升式反应器动物细胞培养及批式生长动力学模型

初步研究了气液双升式动物细胞反应器微载体培养 Bowes细胞和悬浮培养 M4G3杂交瘤细胞的生长条件 ,在不加入消泡剂和保护剂的情况下 ,批式培养 Bowes细胞的最大密度为 2 .6×1 0 6/ml,批式培养 M4G3细胞的最大密度为 1 .5× 1 0 6/ml。基于细胞生长的密度效应 ,建立了动物细胞生长动力学模型 :　　 μ=0　　 t相似文献   

Mycoplasma detection in cell culture by concomitant use of bisbenzamide and fluoresceinated antibody

Summary Conditions are presented for application of both bisbenzamide (Hoechst 33258) stain and a specific fluoresceinated anti-Mycoplasma hyorhinis IgG to a single cell culture preparation. This allows the same field on a slide to be viewed for presumptive diagnosis of any cell culture contaminant mycoplasma by bisbenzamide staining and for definitive diagnosis ofM. hyorhinis strains using fluoresceinated antibody. The use of this method plus a cultural procedure will permit identification of the “noncultivable”M. hyorhinis strain DBS 1050.     

Effects of the sampling design and selection of parameter values on pollen-based quantitative reconstructions of regional vegetation: a case study in southern Sweden using the REVEALS model

The need for quantification of land cover from pollen data has led to the development of a Landscape Reconstruction Algorithm (LRA). The LRA includes several models of which the REVEALS model estimates regional vegetation abundance using pollen assemblages from large sites (lakes or bogs). In this paper we explore the effects of selection and number of pollen samples, and choice of pollen productivity estimates on the REVEALS results. The effect of the size of vegetation surveys is also tested. The results suggest that the differences between two sizes of vegetation surveys have little effect on the model validation. The “characteristic radius” of regional vegetation in southern Sweden was estimated as 200 km. However, the vegetation composition in a 100 × 100 km² square matches well with that estimated by REVEALS. Whether 25, 20 (outliers excluded) or 4 pollen samples are used does not change the REVEALS reconstructions much although the error estimates are larger when outliers are included, and very large when only four samples are used. Therefore validation of the REVEALS model and REVEALS reconstructions of past vegetation can be performed using a limited number of pollen samples, although with caution. The use of many pollen samples from multiple sites is always better whenever possible. REVEALS reconstructions are closer to the actual vegetation when the Danish Pollen Productivity Estimates (PPEs) are used instead of the Swedish PPEs for Cereals, Rumex acetosa/acetosella, Plantago lanceolata and Calluna, indicating that the Danish PPEs are more reliable than the Swedish ones for those taxa. It is recommended to test more than one set of PPEs in validation and applications of the REVEALS model for a better evaluation of the results.