International Microbiology
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β-Galactosidase activity of Escherichia coli under long-term starvation, alterations in temperature, and different nutrient conditions in lake water
International Microbiology - Tập 5 - Trang 127-132 - 2002
β-Galactosidase activity of Escherichia coli was investigated in response to long-term starvation, changes in temperature and the presence of certain nutrient sources in lake water. β-Galactosidase activity decreased markedly in filtered-autoclaved lake water at 25 °C and 37 °C, whereas it remained almost constant at 4 °C and 15 °C for 60 days. Increases in β-galactosidase activity were observed ......
Effect of the fungicide Prochloraz-Mn on the cell wall structure of Verticillium fungicola
International Microbiology - - 2002
Biodegradation and biological treatments of cellulose, hemicellulose and lignin: an overview
International Microbiology - Tập 5 Số 2 - Trang 53-63 - 2002
Studying marine microorganisms from space
International Microbiology - Tập 5 - Trang 195-200 - 2002
Microorganisms are but a few micrometers in diameter and are not visible to the naked eye. Yet, the large numbers of microorganisms present in the oceans and the global impact of their activities make it possible to observe them from space. Here a few examples of how microorganisms can be studied from satellites are presented. The first case is the best known: the main pigment used in photosynthe......
The eaeA gene is not found in Hafnia alvei from patients with diarrhea in Aragón, Spain
International Microbiology - Tập 4 - Trang 81-82 - 2001
A total of 102 Hafnia alvei clinical strains isolated from different patients with diarrhea has been tested, using polymerase chain reaction and dot-blot hybridization, for the enteropathogenic Escherichia coli attaching and effacing A (eaeA) gene to establish their role as a causative agent of diarrhea in our environment. None of them was positive for the eaeA gene. We cannot consider the eaeA g......
Classification and mode of action of membrane-active bacteriocins produced by gram-positive bacteria
International Microbiology - Tập 4 - Trang 13-19 - 2001
Bacteriocins are ribosomally synthesized antimicrobial peptides produced by microorganisms belonging to different eubacterial taxonomic branches. Most of them are small cationic membrane-active compounds that form pores in the target cells, disrupting membrane potentials and causing cell death. The production of small cationic peptides with antibacterial activity is a defense strategy found not o......
New approaches to the study of Antarctic lithobiontic microorganisms and their inorganic traces, and their application in the detection of life in Martian rocks
International Microbiology - Tập 5 - Trang 215-222 - 2002
Microbial life in the harsh conditions of Antarctica's cold desert may be considered an analogue of potential life on early Mars. In order to explore the development and survival of this epilithic and endolithic form of microbial life, our most sophisticated, state-of-the-art visualization technologies have to be used to their full potential. The study of any ecosystem requires a knowledge of its......
Screening of antimicrobial activities in red, green and brown macroalgae from Gran Canaria (Canary Islands, Spain)
International Microbiology - Tập 4 - Trang 35-40 - 2001
Extracts from 44 species of seaweed from Gran Canaria (Canary Islands, Spain) were screened for the production of antibacterial and antifungal compounds against a panel of Gram-negative and Gram-positive bacteria, mycobacteria, yeasts and fungi. A total of 28 species displayed antibacterial activity, of which six also showed antifungal activity. Asparagopsis taxiformis and Cymopolia barbata were ......
Microbial mats and the search for minimal ecosystems
International Microbiology - Tập 5 - Trang 177-188 - 2002
This article reviews some ecological concepts common to all kinds of ecosystems, describes the characteristics of microbial mats, and focuses on the description of the Ebro Delta microbial mats, to assess whether they fit the concept of a minimal ecosystem. First, microorganisms as components of ecosystems are considered, and some features of microbial life, including ubiquity, size and metabolis......
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