scholarly journals High growth potential of transiently 0.2-µm-filterable bacteria with extracellular protease activity in coastal seawater

2019 ◽  
Vol 14 (4) ◽  
pp. 276-286 ◽  
Author(s):  
Yumiko Obayashi ◽  
Satoru Suzuki
Keyword(s):  
Protease Activity ◽  
High Growth ◽  
Extracellular Protease ◽  
Growth Potential ◽  
Coastal Seawater ◽  
Extracellular Protease Activity ◽  
High Growth Potential

scholarly journals High growth potential and activity of 0.2 µm filterable bacteria habitually present in coastal seawater

2017 ◽  
Author(s):  
Yumiko Obayashi ◽  
Satoru Suzuki
Keyword(s):  
Marine Bacteria ◽  
Aquatic Ecosystems ◽  
Seawater Temperature ◽  
High Growth ◽  
Growth Potential ◽  
Aquatic Environments ◽  
Ambient Seawater ◽  
Coastal Seawater ◽  
Lower Temperature ◽  
High Growth Potential

Abstract. The presence of 0.2 µm filterable bacteria in aquatic environments has been known. Some of these bacteria have been reported to be starvation forms, especially those in oligotrophic oceanic seawater. However, 0.2 µm filterable bacteria have not yet been described in temperate coastal seawater. Here, we report the presence of 0.2 µm filterable bacteria in coastal seawater with their high growth potential that appeared under the absence of grazers. In this study, filtered seawater (FSW) microcosms were prepared with 0.2 µm filtered coastal seawater collected in summer and winter without any nutritional amendment and incubated at the ambient seawater temperature (25 °C in summer, 12 °C in winter) and lower temperature (6 °C). During the first several days of the incubations of FSW, the number of prokaryotes collected on 0.2 µm filters markedly increased especially at the ambient seawater temperatures. The diversity of the regenerated bacteria community was comparable to that of the original bacterial community, and most of the identified bacteria were typical marine bacteria (members of Alphaproteobacteria, Gammaproteobacteria and Bacteroidetes), indicating that the 0.2 µm filterable forms of typical marine bacteria show rapid growth under the no grazing and low competition conditions present in the FSW bottles. These results suggest that 0.2 µm filterable bacteria are habitually present even in coastal water, and that these bacteria are always ready for growing in changeable aquatic ecosystems.

scholarly journals The condition of forest stands on afforested agricultural land in the Orlické hory Mts

2017 ◽  
Vol 63 (No. 1) ◽  
pp. 1-8 ◽  
Author(s):  
Cukor Jan ◽  
Baláš Martin ◽  
Kupka Ivo ◽  
Tužinský Marek
Keyword(s):  
Agricultural Land ◽  
High Growth ◽  
Dry Mass ◽  
Growth Potential ◽  
Forest Stands ◽  
Tree Biomass ◽  
Humus Layer ◽  
The Status ◽  
Spruce Stands ◽  
High Growth Potential

The paper presents an evaluation of the growth of newly established forest stands on former agricultural land and furthermore describes the state of the upper part of the soils in these stands in comparison with neighbouring grassland in the Orlické hory Mountains. The new Norway spruce stands show an extremely high growth potential, usually significantly higher in comparison with areas forested for more generations/rotations. The formation of the surface humus layer also showed fast progress, the amount of dry mass of soil organic matter reaching values almost typical of permanently forested sites. The soils of newly afforested lands tend to resemble the status of forest soil – there was observed a process of acidification and nutrient depletion, probably connected with accumulation of the tree biomass.

High growth potential and nitrogen removal performance of marine anammox bacteria in shrimp-aquaculture sediment

Chemosphere ◽  
2018 ◽  
Vol 196 ◽  
pp. 69-77 ◽  
Author(s):  
Luong Van Duc ◽  
Bongkeun Song ◽  
Hiroaki Ito ◽  
Takehide Hama ◽  
Masashi Otani ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
High Growth ◽  
Growth Potential ◽  
Shrimp Aquaculture ◽  
Anammox Bacteria ◽  
High Growth Potential

A Long-Term Culture of Human Hepatocytes Which Show a High Growth Potential and Express Their Differentiated Phenotypes

1999 ◽  
Vol 256 (1) ◽  
pp. 184-191 ◽  
Author(s):  
Hiroshi Hino ◽  
Chise Tateno ◽  
Hajime Sato ◽  
Chihiro Yamasaki ◽  
Shigeru Katayama ◽  
...  
Keyword(s):  
High Growth ◽  
Human Hepatocytes ◽  
Growth Potential ◽  
Long Term Culture ◽  
High Growth Potential

scholarly journals The Virulence Function and Regulation of the Metalloprotease Gene prtA in the Plant-Pathogenic Bacterium Burkholderia glumae

2019 ◽  
Vol 32 (7) ◽  
pp. 841-852 ◽  
Author(s):  
Tiago Lelis ◽  
Jingyu Peng ◽  
Inderjit Barphagha ◽  
Ruoxi Chen ◽  
Jong Hyun Ham
Keyword(s):  
Protease Activity ◽  
Virulent Strain ◽  
Regulatory Gene ◽  
Extracellular Protease ◽  
Bacterial Disease ◽  
Rna Seq ◽  
Burkholderia Glumae ◽  
Responsible Gene ◽  
Extracellular Protease Activity ◽  
Serine Metalloprotease

Bacterial panicle blight caused by Burkholderia glumae is a major bacterial disease of rice. Our preliminary RNA-seq study showed that a serine metalloprotease gene, prtA, is regulated in a similar manner to the genes for the biosynthesis and transport of toxoflavin, which is a known major virulence factor of B. glumae. prtA null mutants of the virulent strain B. glumae 336gr-1 did not show a detectable extracellular protease activity, indicating that prtA is the solely responsible gene for the extracellular protease activity detected from this bacterium. In addition, inoculation of rice panicles with the prtA mutants resulted in a significant reduction of disease severity compared with the wild-type parent strain, suggesting the requirement of prtA for the full virulence of B. glumae. A double mutant deficient in both serine metalloprotease and toxoflavin (ΔtoxA/prtA−) exhibited a further numeric but not statistically significant decrease of disease development compared with the ΔtoxA strain. Both the prtA-driven extracellular protease activity and the toxoflavin production were dependent on both the tofI/tofR quorum-sensing and the global regulatory gene qsmR, indicating the important roles of the two global regulatory factors for the bacterial pathogenesis by this pathogen.

An analysis of growth of different cattle genotypes reared in different environments

1984 ◽  
Vol 103 (1) ◽  
pp. 137-153 ◽  
Author(s):  
J. E. Frisch ◽  
T. E. Vercoe
Keyword(s):  
Growth Rate ◽  
Growth Rates ◽  
High Growth ◽  
Environmental Stresses ◽  
Growth Potential ◽  
Gastrointestinal Helminths ◽  
Treatment Groups ◽  
Survival And Growth ◽  
Different Levels ◽  
High Growth Potential

SummaryCalves from three breeds, Brahman, Hereford × Shorthorn (HS) and Brahman × HS (BX), were divided equally into two groups, one of which was treated every 3 weeks from birth onwards to control ticks and gastrointestinal helminths, and one of which was untreated. Mortalities, growth rates and levels of resistance to environmental stresses that affected both mortality and growth under grazing conditions were recorded for all animals up to weaning (6 months) and for all males up to 15 months of age. The Brahmans were the most and the HS were the least resistant to environmental stresses, each of which was shown to depress growth in proportion to its magnitude and to contribute to the high mortalities of the HS. All breeds responded positively to parasite control with the greatest response in both survival and growth in the HS breed and the least response in the Brahman breed.Samples of males from the various breed-treatment groups were taken into pens where they were protected from environmental stresses and fed both low-quality pasture hay and high-quality lucerne hay ad libitum. Measurements were made of fasting metabolism, maintenance requirement, voluntary food intake and gain, variables related to the growth potential of each animal. The HS animals had the highest whilst the Brahmans had the lowest values for each variable.However, despite their low growth potential, the Brahmans had the highest growtli rate, and the HS, despite their high growth potential, had the lowest growth rate, when growth was measured in the presence of all environmental stresses. When parasites were controlled, growth rates were highest for the BX, the breed with intermediate growtli potential, and did not differ between the HS and Brahmans. These interactions arose because of the different contributions of resistance to environmental stresses and growth potential to growth rate measured at the different levels of environmental stresses. The relevance of these interactions to breed evaluation and cross-breeding is considered.Growth potential and resistance to environmental stresses were negatively correlated both between and within breeds, though the latter was biased by the effects of compensation. The influence of these relationships on the likely outcome of selection for increased growth rate, both between and within breeds, is discussed.

Detection of extracellular protease activity in different species and genera of ectomycorrhizal fungi

Mycorrhiza ◽  
2007 ◽  
Vol 17 (3) ◽  
pp. 241-248 ◽  
Author(s):  
Cajsa M. R. Nygren ◽  
Johan Edqvist ◽  
Malin Elfstrand ◽  
Gregory Heller ◽  
Andy F. S. Taylor
Keyword(s):  
Ectomycorrhizal Fungi ◽  
Protease Activity ◽  
Extracellular Protease ◽  
Extracellular Protease Activity

scholarly journals Cilia protein IFT88 regulates extracellular protease activity by optimizing LRP‐1–mediated endocytosis

2018 ◽  
Vol 32 (12) ◽  
pp. 6771-6782 ◽  
Author(s):  
Clarissa R. Coveney ◽  
Isabella Collins ◽  
Megan Mc Fie ◽  
Anastasios Chanalaris ◽  
Kazuhiro Yamamoto ◽  
...  
Keyword(s):  
Protease Activity ◽  
Extracellular Protease ◽  
Extracellular Protease Activity
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