華中農(nóng)業(yè)大學(xué)微生物英文版課件-資料下載頁(yè)
2025-08-05 03:36本頁(yè)面
【正文】 duction. They obtain the ATP from host cells. 3. Many species of them cause disease in humans and other animals. Rickettsia They are obligate intracellular parasites, unable to generate sufficient ATP to support their reproduction. gramnegative and cell divides by binary fission They Chlamydia cause human respiratory and genitourinary tract disease, and in birds they cause respiratory disease. Chlamydia Diameter= 181。m. They lack cell wall, are bounded by a single triplelayered membrane. They are the smallest anisms capable of selfreproduction. The colony is “fried egg” appearance. Several of them cause diseases in humans. (pneumonia, respiratory tract disease) Mycoplasma Bdellovirio See Movie for the detail of infection and reproduction Movie Classification of bacteria ? MORPHOLOGICAL CHARACTERISTICS ? DIFFERENTIAL STAINING ? NUCLEIC ACID HYBRIDIZATION ? GENETIC RECOMBINATION ? NUMERICAL TAXONOMY Fungi Plants Animals Protista Prokaryotae Fivekingdom system is a monly accepted system of classification Archaebacteria Eubacteria Eukaryotes The taxonomic classification scheme for bacteria may be found in Bergey39。s Manual of Systematic Bacteriology. In Bergey39。s Manual, bacteria are divided into four divisions. Three divisions consist of eubacterial cells, and the fourth division consists of the archaeobacteria. Each division is divided into classes。 Classes are divided into orders。families。 genera。 species. ?Bacterial species is defined simply as a population of cells with similar characteristics. ? strain is a group of cells all derived from a single cell. MORPHOLOGICAL CHARACTERISTICS Morphological characteristics are useful in identifying bacteria. For example, differences in such structures as endospores or flagella can be helpful. However, many microanisms appear too similar to be classified by their structures. DIFFERENTIAL STAINING (for example Gram staining) Most bacteria are either grampositive or gramnegative. But not useful in identifying either the wallless bacteria or the archaeobacteria with unusual walls. NUCLEIC ACID HYBRIDIZATION GENETIC RECOMBINATION
規(guī)章制度相關(guān)推薦
鄂ICP備17016276號(hào)-1