When stationary culture was replaced by submerged cultivation in a fermentor, a significant increase in the yield of diphtheria toxin in a short cultivation time (less than 48 h as against 7-8 d) was noted. It was found that under optimal conditions of temperature, vortex mixing and surface aeration, an alkaline pH favoured toxin release. Furthermore, to enhance the production volume, two-and three-step semicontinuous batch cultivations were carried out. The toxin produced was of good titre with an adequate antigenic purity. Under optimal conditions, the variation in the Limes of flocculation (Lf titre) was likely due to the quality of the production medium, which in turn depended on the quality of the raw materials used. The process was also optimized in a pilot-scale fermentor.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1263/jbb.91.123 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Extent of genetic and epigenetic factor reprogramming via a single viral vector construct in deaf adult mice.
Hear Res
December 2024
Bionics Institute, East Melbourne, Victoria 3002, Australia; Department of Medical Bionics, The University of Melbourne, Fitzroy, Victoria 3065, Australia; Department of Surgery (Otolaryngology), University of Melbourne, The Royal Victorian Eye and Ear Hospital, East Melbourne, Victoria 3002, Australia. Electronic address:
In the adult mammalian cochlea, hair cell loss is irreversible and causes deafness. The basic helix-loop transcription factor Atoh1 is essential for normal hair cell development in the embryonic ear. Over-expression of Atoh1 in the adult cochlea by gene therapy can convert supporting cells (cells that underlie hair cells) into a hair cell lineage.
View Article and Find Full Text PDFDiphtheria antitoxin treatment: from pioneer to neglected.
Mem Inst Oswaldo Cruz
January 2025
Institut Pasteur, Université Paris Cité, Biodiversity and Epidemiology of Bacterial Pathogens, Paris, France.
Diphtheria, a severe respiratory infection, was a major killer of children until the early years of the 20th century. Although diphtheria is now largely controlled globally thanks to vaccination, it is still endemic in some world regions and large epidemics can occur where vaccination coverage is insufficient. The pathological effects caused by its main virulence factor, diphtheria toxin, can be diminished by passive transfer of antibodies.
View Article and Find Full Text PDFFibrocyte enrichment and myofibroblastic adaptation causes nucleus pulposus fibrosis and associates with disc degeneration severity.
Bone Res
January 2025
Department of Orthopaedics and Traumatology, The University of Hong Kong, Hong Kong SAR, China.
Fibrotic remodeling of nucleus pulposus (NP) leads to structural and mechanical anomalies of intervertebral discs that prone to degeneration, leading to low back pain incidence and disability. Emergence of fibroblastic cells in disc degeneration has been reported, yet their nature and origin remain elusive. In this study, we performed an integrative analysis of multiple single-cell RNA sequencing datasets to interrogate the cellular heterogeneity and fibroblast-like entities in degenerative human NP specimens.
View Article and Find Full Text PDFMapping TcdB interactions with host cell-surface and intracellular factors using proximity-dependent biotinylation labeling.
mBio
January 2025
Department of Biochemistry, University of Toronto, Toronto, Ontario, Canada.
Many bacterial toxins exert their cytotoxic effects by enzymatically inactivating one or more cytosolic targets in host cells. To reach their intracellular targets, these toxins possess functional domains or subdomains that interact with and exploit various host factors and biological processes. Despite great progress in identifying many of the key host factors involved in the uptake of toxins, significant knowledge gaps remain as to how partially characterized and newly discovered microbial toxins exploit host factors or processes to intoxicate target cells.
View Article and Find Full Text PDFInhibition of aortic CX3CR1+ macrophages mitigates thoracic aortic aneurysm progression in Marfan syndrome in mice.
J Clin Invest
January 2025
Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University; State Key Laboratory of Vascular Homeostasis and Remodeling, Peking University, Beijing, China.
The pathogenesis of thoracic aortic aneurysm (TAA) in Marfan syndrome (MFS) is generally attributed to vascular smooth muscle cell (VSMC) pathologies. However, the role of immune cell-mediated inflammation remains elusive. Single-cell RNA sequencing identified a subset of CX3CR1+ macrophages mainly located in the intima in the aortic roots and ascending aortas of Fbn1C1041G/+ mice, further validated in MFS patients.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!