Bacterial flora of phyto- and zoo-plankton in the inshore water of Japan

1971 ◽  
Vol 17 (9) ◽  
pp. 1157-1160 ◽  
Author(s):  
U. Simidu ◽  
K. Ashino ◽  
E. Kaneko
Keyword(s):  
Heterotrophic Bacteria ◽  
Bacterial Flora ◽  
Marine Organisms ◽  
Inshore Water ◽  
Generic Composition

Generic composition of aerobic bacterial flora of plankton was compared with that of seawater. More than 70% of the heterotrophic bacteria from most of the plankton samples were Vibrio and Aeromonas, while the percentage of occurrence of these genera in the seawater flora was about 45%. The assumption that some Vibrio and Aeromonas are closely associated with marine organisms was discussed.

Growth responses of oligotrophic and heterotrophic marine bacteria in various substrate concentrations, and taxonomic studies on them

1980 ◽  
Vol 26 (7) ◽  
pp. 800-806 ◽  
Author(s):  
Y. Akagi ◽  
U. Simidu ◽  
N. Taga
Keyword(s):  
Marine Bacteria ◽  
Heterotrophic Bacteria ◽  
Bacterial Flora ◽  
Relative Proportion ◽  
Sampling Station ◽  
Growth Responses ◽  
Oligotrophic Bacteria ◽  
The Media ◽  
Taxonomic Studies ◽  
Substrate Concentrations

Growth responses of oligotrophic bacteria to substrate concentrations have been investigated in comparison with those of heterotrophic bacteria. The results suggested that oligotrophs were the group which could grow and produce a perceptible turbidity in the media containing less than 10 mg peptone C/L of medium.Taxonomic studies indicated that the most abundant group in the oligotrophic bacterial flora was consistent with that in the heterotrophic bacterial flora at each sampling station. However, the relative proportion of pseudomonads in the oligotrophs was higher than that in the heterotrophs (at stations H-24, H-28, H-29, Ab-1, Ab-2, and O-4), while the relative proportion of Vibrio in the former was lower than that in the latter (at stations H-24, H-28, H-29, O-4, and O-9).

The effect of chromic oxide (Cr2O3) on aerobic bacterial populations associated with the intestinal epithelial mucosa of Arctic charr, Salvelinus alpinus (L.)

1993 ◽  
Vol 39 (12) ◽  
pp. 1169-1173 ◽  
Author(s):  
Einar Ringø
Keyword(s):  
Heterotrophic Bacteria ◽  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Bacterial Flora ◽  
Chromic Oxide ◽  
Intestinal Epithelial ◽  
Gram Positive ◽  
Bacterial Populations ◽  
Gram Negative ◽  
Attachment Sites

Populations of aerobic heterotrophic bacteria present in the gastrointestinal tract of healthy Arctic charr, Salvelinus alpinus (L.), were estimated using the dilution plate technique. The gastrointestinal bacterial flora of fish fed an unsupplemented diet was dominated by Gram-negative bacteria of the genera Acinetobacter, Aeromonas, Agrobacterium, Alcaligenes, Cytophaga, Flavobacterium, Pseudomonas, and Vibrio, and Gram-positive bacteria of the genera Arthrobacter, Brevibacterium, Corynebacterium, Kurthia, Lactobacillus, Microbacterium, Micrococcus, Staphylococcus, and Streptococcus. The composition of the indigenous aerobic bacterial flora in the digestive tract, and especially the microorganisms isolated from the midgut and hindgut regions, was affected by inclusion of 1% chromic oxide (Cr2O3) in the diet. Many of the Gram-negative bacterial genera and some of the Gram-positive bacterial genera were not detectable in the Cr2O3-fed fish. The midgut and hindgut regions in the Cr2O3-fed fish were dominated by Gram-positive microorganisms of the genera Lactobacillus and Streptococcus. It is suggested that the increased accumulation of Cr2O3 in the alimentary tract, as dietary compounds are removed, affects the attachment sites for the gastrointestinal microflora or affects the gut epithelium directly.Key words: chromic oxide, aerobic bacterial flora, Arctic charr.

SOIL MICROORGANISMS ASSOCIATED WITH FLAX ROOTS

1967 ◽  
Vol 13 (2) ◽  
pp. 199-203 ◽  
Author(s):  
E. A. Peterson ◽  
J. W. Rouatt
Keyword(s):  
Fusarium Oxysporum ◽  
Soil Microorganisms ◽  
Bacterial Flora ◽  
Susceptible Variety ◽  
Resistant Variety ◽  
Bacterial Isolates ◽  
Selective Action ◽  
Generic Composition ◽  
Disease Free

The root microflora of Bison flax, resistant to wilt caused by Fusarium oxysporum f. lini, was compared with that of the wilt-susceptible variety Novelty. Plants grown in "disease-free" soil show that the susceptible variety harbors not only the most numerous, but also the most metabolically active bacterial flora on its roots. Generic classification of bacterial isolates shows a higher incidence of more active organisms, represented by Pseudomonas and Flavobacterium on roots of the susceptible crop, whereas the more slowly growing pleomorphic types such as Arthrobacter were most abundant on roots of the resistant variety. Fungi were also more numerous on roots of the susceptible crop, but the generic composition of rhizosphere populations of both varieties was similar to that of the soil itself. Fusarium oxysporum dominated the flora occurring in an active mycelial state on roots of the susceptible variety, whereas F. oxysporum and Phoma sp. were codominants in the active flora of the resistant crop. Tests with other soils showed that dominance of specific genera varies with soil type. The results indicate a selective action on the root microflora, particularly the bacteria, and suggest both quantitative and qualitative differences in root environments of the two flax varieties.

scholarly journals Utjecaj kišnih glista Lubricus rubellus na brojnost mikroorganizama u zemljištu tretiranom pendimetalinom

2018 ◽  
Vol 41 (5) ◽  
pp. 44-53
Author(s):  
Igor Milunović ◽  
Biljana Lubarda
Keyword(s):  
Heterotrophic Bacteria ◽  
Bacterial Flora ◽  
The Other ◽  
Lumbricus Rubellus ◽  
Free Living ◽  
Cellulolytic Microorganisms ◽  
Glass Containers ◽  
Negative Effect ◽  
Positive Effect ◽  
Earthworm Lumbricus

This paper examines the modus in which earthworm Lumbricus rubellus with its activity affects the total count of different physiological groups of microorganisms in soil treated with herbicide pendimethalin.The experiment was carried out in ten glass containers with a soil substrate, whereby one of them was the control one, and each group of three containers was treated with different concentration of pendimethalin. A concentration of pesticide of 5 μl/kg, which is recommended by the declaration, one lower concentration of 3 μl/kg and one higher of 7 μl/kg were used. The number of physiological groups of microorganisms is determined from the three containers treated with different concentrations of pendimethalin 48 hours after the treatment, and from the other three containers 21 days after the treatment. Two days after the application of different concentration of pesticide, a significant statistical decrease was found in the number of fungi and cellulotical microorganisms in soil, while the total number of heterotrophic bacteria as well as microorganisms which participate in different stages of nitrogen metabolism increased. However, 21 days after the treatment a significant decrease in the total number of heterotrophic bacteria in all treated containers comparing to the control one was noticed, where earthworms with their activities partially attenuated the negative effect of pendimethalin on soil bacterial flora. They also had a positive effect on the number of fungi, actinomycetes and cellulolytic microorganisms while the presence of earthworms had no significant influence on the number of aminoautotrophs, oligonitrophils and free-living diazotrophs. It was shown that earthworms with their activities attenuate the negative effect of pendimethalin on bacterial flora, actinomycetes and fungi, which points out to their possible use in processes of bioremediation.

Bacterial Flora of Some Algal Foods Used for Rearing Bivalve Larvae

1969 ◽  
Vol 26 (10) ◽  
pp. 2760-2764 ◽  
Author(s):  
Robert A. Murchelano ◽  
Carolyn Brown
Keyword(s):  
Crassostrea Virginica ◽  
Heterotrophic Bacteria ◽  
Bacterial Flora ◽  
Mercenaria Mercenaria ◽  
Hard Clam ◽  
Marine Waters ◽  
Gram Negative ◽  
Bivalve Larvae ◽  
Mass Cultures

The heterotrophic bacteria present in 15 mass cultures of six different genera of algae used for feeding larvae of the Atlantic oyster, Crassostrea virginica, and the hard clam, Mercenaria mercenaria, were isolated, identified, and their physiology studied. Of the 120 isolates obtained, 118 (98.3%) were asporogenous, gram-negative rods — types commonly found in marine waters. The majority of the isolates, 98 (81.6%), belonged to the genus Pseudomonas.

Gut microbiome a promising target for management of respiratory diseases

2020 ◽  
Vol 477 (14) ◽  
pp. 2679-2696
Author(s):  
Riddhi Trivedi ◽  
Kalyani Barve
Keyword(s):  
Respiratory Diseases ◽  
New Technology ◽  
Bacterial Flora ◽  
Systemic Circulation ◽  
The Body ◽  
Lung Pathology ◽  
Promising Target ◽  
Current Therapies ◽  
Intestinal Microbial Flora ◽  
On Chip

The intestinal microbial flora has risen to be one of the important etiological factors in the development of diseases like colorectal cancer, obesity, diabetes, inflammatory bowel disease, anxiety and Parkinson's. The emergence of the association between bacterial flora and lungs led to the discovery of the gut–lung axis. Dysbiosis of several species of colonic bacteria such as Firmicutes and Bacteroidetes and transfer of these bacteria from gut to lungs via lymphatic and systemic circulation are associated with several respiratory diseases such as lung cancer, asthma, tuberculosis, cystic fibrosis, etc. Current therapies for dysbiosis include use of probiotics, prebiotics and synbiotics to restore the balance between various species of beneficial bacteria. Various approaches like nanotechnology and microencapsulation have been explored to increase the permeability and viability of probiotics in the body. The need of the day is comprehensive study of mechanisms behind dysbiosis, translocation of microbiota from gut to lung through various channels and new technology for evaluating treatment to correct this dysbiosis which in turn can be used to manage various respiratory diseases. Microfluidics and organ on chip model are emerging technologies that can satisfy these needs. This review gives an overview of colonic commensals in lung pathology and novel systems that help in alleviating symptoms of lung diseases. We have also hypothesized new models to help in understanding bacterial pathways involved in the gut–lung axis as well as act as a futuristic approach in finding treatment of respiratory diseases caused by dysbiosis.

Bacterial flora of the human small intestine

JAMA ◽  
1966 ◽  
Vol 196 (13) ◽  
pp. 1125-1127 ◽  
Author(s):  
G. H. Bornside
Keyword(s):  
Small Intestine ◽  
Bacterial Flora ◽  
Human Small Intestine
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