All posts by Postępy Mikrobiologii

Gatunki koagulazododatnie rodzaju Staphylococcus – taksonomia, chorobotwórczość

Coagulase-positive species of the genus Staphylococcus– taxonomy, pathogenicity
W. Kmieciak, E. M. Szewczyk

1. Wstęp. 2. Koagulaza gronkowcowa. 3. Staphylococcus aureus. 4. Gronkowce grupy SIG. 4.1. Staphylococcus intermedius. 4.2. Staphylococcus pseudintermedius. 4.3. Staphylococcus delphini. 5. Staphylococcus hyicus. 6. Staphylococcus schleiferi subsp. coagulans. 7. Staphylococcus lutrae. 8. Staphylococcus agnetis. 9. Podsumowanie

Abstract: Staphylococci constitute an important component of the human microbiome. Most of them are coagulase-negative species, whose importance in the pathogenesis of human infections has been widely recognized and is being documented on a regular basis. Until recently, the only well-known coagulase-positive staphylococcus species recognized as human pathogen was Staphylococcus aureus. Previously, the ability to produce coagulase was used as its basic diagnostic feature, because other coagulase-positive species were associated with animal hosts. Progress in the laboratory medicine, in which automatic or semi-automatic systems identify the staphylococci species, revealed a phenomenon of spreading of the coagulase positive staphylococci to new niches and hosts, as they are being isolated from human clinical materials with increasing frequency. As a result, many reaserchers and laboratories have turned their attention to the phenomenon, which caused an inflow of new data on these species. An increasingly expansive pathogenic potential of coagulase-positive staphylococci against humans has been documented. In the presented study, recent data on both S. aureus and species previously considered to be animal, i.e. S. intermedius, S. pseudintermedius, S. delphini, S. lutrae, S. schleiferi subsp. coagulans, S. hyicus as well as newly described species S. agnetis, were shown.

1. Introduction. 2. Staphylococcal coagulase. 3. Staphylococcus aureus. 4. Staphylococcus intermedius Group species. 4.1. Staphylococcus intermedius. 4.2. Staphylococcus pseudintermedius. 4.3. Staphylococcus delphini. 5. Staphylococcus hyicus. 6. Staphylococcus schleiferi subsp. coagulans. 7. Staphylococcus lutrae. 8. Staphylococcus agnetis. 9. Summary

Komunikaty i informacje

Information and announcements

W dniu 27.03.2017 r. odbyło się pierwsze zebranie Zarządu Głównego Polskiego Towarzystwa Mikrobiologów kadencji 2016–2020.
 Informacja o konferencjach współorganizowanych przez polskie towarzystwo mikrobiologów oraz z patronatem PTM w 2017 r.

Krezole a drobnoustroje środowiska glebowego

Cresols and the microorganisms of the soil environment
M. Zaborowska

1. Wstęp. 2. Naturalne i antropogeniczne źródła krezoli w środowisku. 3. Toksyczność krezoli. 4. Drobnoustroje uczestniczące w rozkładzie krezoli. 5. Tlenowy katabolizm krezoli. 6. Beztlenowy katabolizm krezoli. 7. Mikrobiologiczna degradacja krezoli w środowisku glebowym. 8. Podsumowanie

Abstract: Phenolic compounds, including cresols, in the soil environment are a result of natural processes such as: biodegradation of lignins and tannins, and anthropogenic activity. Cresols are present in disinfectants as well as in the wastewater from chemical, petrochemical, pharmaceutical, paper and textile industry. They are also used in the production of insecticides, herbicides, medicines and antioxidants and have been classified as hazardous substances. Exposure of microorganisms to cresols can bring about changes in the structure of their cell membranes, resulting in their growth inhibition and cell lysis. However, there is still an untapped bioremediation potential in microorganisms, which are able to participate in the catabolism of cresols, both under aerobic and anaerobic conditions. The typical strategies of the aerobic degradation of cresols include the use of monooxygenase and dioxygenase enzymes. Thanks to these enzymes, atoms of molecular oxygen initiate fission of the aromatic ring structure. Under anaerobic conditions, the mechanisms of cresol decomposition  currently focus on the addition of fumarate, hydroxylation or carboxylation. The effectiveness of microorganisms in the degradation of cresols is not only due to their occurrence in consortia. They are also effective as single strains. The only controversial aspect involves using genetically modified organisms (GMOs) or their genes in the bioaugmentation process. This is because they are strictly selected and target only specific substrates. Due to this, they do not compete with autochthonous microorganisms undergoing natural selection.

1. Introduction. 2. Natural and anthropogenic sources of cresols in the environment. 3. Toxicity of cresols. 4. The microorganisms participating in the distribution of cresols. 5. Aerobic catabolism of cresols. 6. Anaerobic catabolism of cresols. 7. Microbial degradation of cresols in the soil environment. 8. Summary

Najnowszy numer

Najnowszy numer

POSTĘPY MIKROBIOLOGII
2018, 57, 4

O Towarzystwie

PTM

Celem Polskiego Towarzystwa
Mikrobiologów jest propagowanie rozwoju nauk mikrobiologicznych

i popularyzowanie osiągnięć
mikrobiologii wśród członków Towarzystwa oraz szerokich kręgów społeczeństwa. Formami działalności jest organizowanie zjazdów, posiedzeń naukowych, kursów, wykładów
i odczytów oraz konkursów prac naukowych; wydawanie i popieranie wydawania czasopism naukowych, książek
i innych publikacji
z dziedziny mikrobiologii; opiniowanie o stanie i potrzebach mikrobiologii polskiej

i występowanie w jej sprawach wobec
władz państwowych; współpraca
z pokrewnymi stowarzyszeniami
w kraju i za granicą.