scholarly journals Effect of Biochar on the Production of L-Histidine From Glucose Through Escherichia coli Metabolism

2021 ◽  
Vol 8 ◽  
Author(s):  
Yang E ◽  
Jun Meng ◽  
Heqing Cai ◽  
Caibin Li ◽  
Sainan Liu ◽  
...  
Keyword(s):  
Organic Compounds ◽  
Traditional Method ◽  
Organic Molecules ◽  
Lethal Dose ◽  
The Other ◽  
Related Gene ◽  
High Concentration ◽  
E Coli ◽  
Hormone Analogs

The organic compounds from biochar play a role of hormone analogs, stimulating the expression of metabolites by controlling related gene and protein. In this experiment, we reported the L-histidine biosysthesis was promoted by biochar treatment in E. coli unlike genetic engineering of the traditional method. The related results indicated the most optimal concentration was found to be 3%, and 7% is the lethal dose. E. coli was inhibited in the high-concentration treatment. On the other hand, docking technology was usually used as drug screening, basing on Lock-and-key model of protein in order to better understand mechanisms. So the organic compounds of biochar from GC-MS analysis that acted as ligands were connected to HisG protein controlling L-histidine biosysthesis in E. coli. The result showed that the three organic molecules interacted with HisG protein by hydrogen bond. So we considered that these three compounds play regulatory roles in L-histidine biosysthesis, and the hisG gene expression fully supports this conclusion.

scholarly journals Alterations of Plasmin Activity, Plasminogen Levels and Activity of Anti-Plasmins During Endotoxin Shock in Dogs

1977 ◽  
Author(s):  
A. O. Aasen ◽  
M. J. Gallimore ◽  
K. Ohlsson ◽  
E. Amundsen
Keyword(s):  
Intravenous Infusion ◽  
Lethal Dose ◽  
Endotoxin Shock ◽  
Time Dependent ◽  
Plasmin Activity ◽  
Endotoxin Infusion ◽  
E Coli ◽  
Research Division ◽  
Late Stages

Endotoxin shock was induced in dogs by intravenous infusion of a lethal dose of E. coli endotoxin over a period of 3 hours. Typical changes of cardiovascular parameters were found and evidence of an intravascular clotting process was observed. Spontaneous plasmin activity and “immediate” and “time dependent” antiplasmin activities were determined by means of assays utilizing the chromogenic tripeptide derivative S-2251(Kabi Peptide Research Division, Mölndal, Sweden). Levels of plasminogen, α2-macrolobulin (α2-M) , and ai-antitrypsin(α1-AT) were determined immunochemically. During shock, gradually decreasing values of “immediate” antiplasmin and α2M were observed. During the late stages of shock “immediate” antiplasmin was found to be reduced by up to 89 per cent and α2M up to 50 per cent of pre endotoxin infusion values. A less marked lowering of “time dependent” antiplasmin and α1-AT also occurred during shock. These changes of plasma antiplasmins were accompanied by decreasing values of plasminogen and evidence of plasmin activity. These findings indicate that plasminogen is converted to plasmin during endotoxin shock and emphasize the role of antiplasmins in the pathophysiology of endotoxin shock.

scholarly journals The bar-properties, in particular glucosylation of deoxy-ribonucleic acid, in crosses of bacteriophages T2 and T4

1967 ◽  
Vol 9 (2) ◽  
pp. 149-158 ◽  
Author(s):  
B. de Groot
Keyword(s):  
Protective Effect ◽  
Host Range ◽  
Ribonucleic Acid ◽  
Bacteriophage T4 ◽  
The Other ◽  
New Host ◽  
E Coli ◽  
Marker Rescue ◽  
Single Burst

Analysis of the inheritance of the three bar-properties of bacteriophage T4: exclusion of T2 from the progeny of crosses, glucosylation of the hydroxymethylcytosine (HMC)moiety of the DNA according to T4, and plating with large plaques on E. coli K strains, was carried out by means of marker rescue from T4 by T2 on E. coli K (λh) as a selective indicator. Five of the strains isolated plated with large plaques on K (λh), but did not exclude T2 and showed T2 glucosylation; plating on E. coli K (λh) was found to segregate from the other two bar-properties. The sixth isolate showed, in addition to plating with large plaques on K, partial non-excludability by the parental T4 and T4 glucosylation of HMC. If partial non-excludability is the result of T4 glucosylation, the role of the additional glucose substitutions might be a protective effect on the DNA against the exclusion factor of T4. This proposal is supported by the analysis of the progeny from a single burst from a cross of T4 and T2. The following T2 genes were partially excluded: host-range, no exclusion of parental T2, sensitivity to ultraviolet, and limited plating efficiency on E. coli K (λh). The exclusion factor of T4 is not transmitted to all progeny and does not behave like a bar-property. Only resistance to exclusion and T4 glucosylation were transmitted to all twenty-seven progeny of the single burst. The elimination of sensitivity to exclusion and T2 glucosylation is explained by assuming that the recombinant class with the exclusion factor of T4 and T2 α-glucosylation will exclude itself and be suicidal upon infection of a new host. Exclusion and differential glucosylation are discussed with regard to restriction and modification, respectively.

scholarly journals Bacterial Dose-Dependent Role of G Protein-Coupled Receptor Kinase 5 in Escherichia coli-Induced Pneumonia

2016 ◽  
Vol 84 (5) ◽  
pp. 1633-1641 ◽  
Author(s):  
Nandakumar Packiriswamy ◽  
Michael Steury ◽  
Ian C. McCabe ◽  
Scott D. Fitzgerald ◽  
Narayanan Parameswaran
Keyword(s):  
Escherichia Coli ◽  
G Protein ◽  
Lethal Dose ◽  
Neutrophil Recruitment ◽  
Sublethal Dose ◽  
Receptor Kinase ◽  
Content Type ◽  
E Coli ◽  
G Protein Coupled

G protein-coupled receptor kinase 5 (GRK5) is a serine/threonine kinase previously shown to mediate polymicrobial sepsis-induced inflammation. The goal of the present study was to examine the role of GRK5 in monomicrobial pulmonary infection by using an intratrachealEscherichia coliinfection model of pneumonia. We used sublethal and lethal doses ofE. colito examine the mechanistic differences between low-grade and high-grade inflammation induced byE. coliinfection. With a sublethal dose ofE. coli, GRK5 knockout (KO) mice exhibited higher plasma CXCL1/KC levels and enhanced lung neutrophil recruitment early after infection, and lower bacterial loads, than wild-type (WT) mice. The inflammatory response was also diminished, and resolution of inflammation advanced, in the lungs of GRK5 KO mice. In contrast to the reduced bacterial loads in GRK5 KO mice following a sublethal dose, at a lethal dose ofE. coli, the bacterial burdens remained high in GRK5 KO mice relative to those in WT mice. This occurred in spite of enhanced plasma CXCL1 levels as well as neutrophil recruitment in the KO mice. But the recruited neutrophils (following high-dose infection) exhibited decreased CD11b expression and reduced reactive oxygen species production, suggesting decreased neutrophil activation or increased neutrophil exhaustion in the GRK5 KO mice. In agreement with the increased bacterial burden, KO mice showed poorer survival than WT mice followingE. coliinfection at a lethal dose. Overall, our data suggest that GRK5 negatively regulates CXCL1/KC levels during bacterial pneumonia but that the role of GRK5 in the clinical outcome in this model is dependent on the bacterial dose.

An introduction to biominerals and the role of organic molecules in their formation

1984 ◽  
Vol 304 (1121) ◽  
pp. 411-424 ◽  
Keyword(s):  
Organic Molecules ◽  
Organic Materials ◽  
Solubility Limit ◽  
Nucleation And Growth ◽  
The Other ◽  
Medical Problems ◽  
Calcium Compounds ◽  
Inorganic Components ◽  
Iron And Calcium

The minerals of biology have two components, one of which is inorganic and the other organic. Understanding rests initially in the description of the factors that control the nucleation and growth of the inorganic components in the absence of organic materials, and in the study of the organic materials in the absence of the inorganic phase. Brief summaries of these studies are given and then an attempt is made to examine some of the interactive features of the whole mineral. There are very few generalizations that can be formulated yet since each mineral appears to be associated with the metabolic processes of a special cell. Partly, this is due to the diverse function that biominerals perform: supports, protection, sensors, storage and even homeostasis. We must also be aware of the vulnerable nature of precipitation control above the solubility limit. Many widespread medical problems involve the incorrect precipitation of iron and calcium compounds especially.

scholarly journals The role of Biofilm for Pseudomonas aeruginosa to resistance ultraviolet and MIC concentration for antibiotics

2012 ◽  
Vol 36 (0A) ◽  
pp. 13-19
Author(s):  
احمد محمد تركي
Keyword(s):  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
High Resistance ◽  
The Other ◽  
Bacterial Isolates ◽  
Staph Aureus ◽  
E Coli ◽  
The Impact ◽  
And Staphylococcus Aureus

The present study is conducted to in restigate the bacteria Pseudomonas aeruginosa, the impact of ultraviolet on the bacterial isolates under study and the resistance of these isolates to ultraviolet are studied in comparison to two standard isolates ( E . coli and Staphylococcus aureus ) which are considered sensitive to ultraviolet . The natures of the resistance of the isolates, under study, are also being investigated against the different antibiotics. The isolates are subjected to a test to examine their sensitivity to (12) types of antibiotics used routinely in the treatment of various infection of these bacteria. They are (streptomycin , cephalothin ,Gentamycin , cefotaxime ,nitrofurantion ,ampicillin, amoxicillin, rifampin, lincomycin, tetracycline, erythromycin and ciprofloxacin ).The lowest concentration installer ( MIC ) is also testified in accordance with six types of antibiotics (streptomycin, cefotaxime , rifampin , nitrofurantion , Gentamycin , amoxicillin ).The biologic effectiveness of the overlap between the bacterial isolates , under study, is examined against four bacteria (klebseilla pneumonia , Staphylococcus aureus , Enterobacter , Proteus ) The result of using the ultraviolet with different wavelength show the ability of the five local isolates used to resistance of ultraviolet reaching (180 s.) in comparison to the isolates E.coli and staph. aureus in which the ratio of killing is %100 at a time of exposing 40 , 60 sec. respectively. The results indicated that the five local bacterial isolates have high resistance to the most tested antibiotics, It is shouted that all of them have resistance to (erythromycin , tetracycline , lincomycin , Gentamycin ) but they are sensitive towards antibiotic streptomycin . as for the other antibiotics , over can find that the isolates are varied of them for being resisting or sensitive towards them .The results of testing the inhabited effectiveness of the five bacterial isolates towards some other bacterial isolates show the efficiency of the five local isolates in the inhabitation of growth of the five studied bacterial isolates.

scholarly journals The Influence of Silica Nanoparticles Geometry on the Interfacial Interactions of Organic Molecules: A Simulation Perspective

2022 ◽  
Author(s):  
Prasad Rama ◽  
Zareen Abbas
Keyword(s):  
Silica Nanoparticles ◽  
Organic Molecules ◽  
Particle Surface ◽  
The Other ◽  
Interfacial Interactions ◽  
Nanoparticle Shape ◽  
Other Hand ◽  
Adsorption Of Organic Molecules ◽  
Unexplored Area

The role of nanoparticle shape in the interaction and adsorption of organic molecules on the particle surface is an unexplored area. On the other hand, such knowledge is not only...

scholarly journals Role of Molybdate and Other Transition Metals in the Accumulation of Protochelin by Azotobacter vinelandii

2000 ◽  
Vol 66 (4) ◽  
pp. 1580-1586 ◽  
Author(s):  
Anthony S. Cornish ◽  
William J. Page
Keyword(s):  
Metal Ions ◽  
Azotobacter Vinelandii ◽  
The Other ◽  
Binding Potential ◽  
Natural Soil ◽  
Ferric Reductase ◽  
Soil Environment ◽  
High Concentration ◽  
Aerobic Organism

ABSTRACT Both molybdate and iron are metals that are required by the obligately aerobic organism Azotobacter vinelandii to survive in the nutrient-limited conditions of its natural soil environment. Previous studies have shown that a high concentration of molybdate (1 mM) affects the formation of A. vinelandiisiderophores such that the tricatecholate protochelin is formed to the exclusion of the other catecholate siderophores, azotochelin and aminochelin. It has been shown previously that molybdate combines readily with catecholates and interferes with siderophore function. In this study, we found that the manner in which each catecholate siderophore interacted with molybdate was consistent with the structure and binding potential of the siderophore. The affinity that each siderophore had for molybdate was high enough that stable molybdo-siderophore complexes were formed but low enough that the complexes were readily destabilized by Fe3+. Thus, competition between Fe3+ and molybdate did not appear to be the primary cause of protochelin accumulation; in addition, we determined that protochelin accumulated in the presence of vanadate, tungstate, Zn2+, and Mn2+. We found that all five of these metal ions partially inhibited uptake of55Fe-protochelin and 55Fe-azotochelin complexes. Also, each of these metal ions partially inhibited the activity of ferric reductase, an enzyme important in the deferration of ferric siderophores. Our results suggest that protochelin accumulates in the presence of molybdate because protochelin uptake and conversion into its component parts, azotochelin and aminochelin, are inhibited by interference with ferric reductase.

scholarly journals Survival of Escherichia coli 0157:H7 in cultured butter during storage.

2018 ◽  
Vol 53 (2) ◽  
pp. 147
Author(s):  
A. GOVARIS (Α. ΓΚΟΒΑΡΗΣ) ◽  
D. K. PAPAGEORGIOU (Δ.Κ. ΠΑΠΑΓΕΩΡΓΙΟΥ) ◽  
K. PAPATHEODOROU (Κ. ΠΑΠΑΘΕΟΔΩΡΟΥ)
Keyword(s):  
Escherichia Coli ◽  
The Other ◽  
High Concentration ◽  
E Coli ◽  
High Inoculum ◽  
Initial Ph

The survival of E. coli 0157:H7 was examined in 3 types of butter: unsalted, salted with 0.46% and 0.93% salt. The butter samples were inoculated with a low (c.a. 3.14 log CFU/g) or high concentration (c.a. 4.80 log CFU/g) inoculum of the pathogen and were stored at 4°C and 12°C. The contaminated butter samples were stored for 2 months at 4°C and up to visible spoilage (20-26 days) at 12° C. By the end of the storage at 4°C, the tests with the high inoculum of the pathogen revealed that populations of E. coli 0157:H7 were decreased by 2.26 log CFU/g in the unsalted and in 0.46% salted types of butter, and by 2.74 log CFU/g in the 0.93% salted type of butter, while the tests with the low inoculum of the pathogen revealed that populations of E. coli Ol57:H7 decreased by 1.81 log CFU/g in the unsalted type of butter and were detectable in the other types of butter only after enrichment. By the end of the storage at 12°C, the tests with the high inoculum of the pathogen revealed that populations of E coli Ol57:H7 decreased by 2.71 and 3.17 log CFU/g in the unsalted and 0.46% salted types of butter, after 20 and 22 days, respectively and were detectable, in the 0.93% salted type of butter after 26 days, only after enrichment, while the tests with the low inoculum of the pathogen revealed that populations of E. coli O l 57:H7 were decreased by 1.88 log CFU/g in the unsalted type of butter after 20 days, and were detectable, in the 0.46% and 0.93% salted types of butter after 22 and 24 days, respectively, only after enrichment. The initial pH of all butter samples (5.18±0.01) decreased slightly (0.06-0.10) during storage at 4°C, and more (0.48 - 0.54) during storage at 12°C.

scholarly journals Emergence in Biopharmaceuticals: The Role of Gedunin and Nimbin from Azadirachta indica as a potential cure for SARS CoV-2 and other viral diseases

2021 ◽  
Author(s):  
charunayan kamath ◽  
Archanna J
Keyword(s):  
Severe Acute Respiratory Syndrome ◽  
Computational Methods ◽  
Azadirachta Indica ◽  
Traditional Method ◽  
The Other ◽  
Viral Diseases ◽  
Bioactive Components ◽  
Neem Leaves ◽  
Effective Remedy

The COVID-19 pandemic caused by Severe Acute Respiratory Syndrome Corona virus 2 –SARS CoV- 2 has affected over 170 million people worldwide out of which 3.5 million have lost their lives so far. There is no effective remedy for this highly contagious disease to date. This study examines the effect of Gedunin and Nimbin, one of the constituents of Neem leaves (Azadirachta indica), especially as a possible prophylactic element and a remedy for Covid-19 using computational methods. Other main constituents of the neem leaves such as Azadirachtin and Nimbidin may also work as an active antiviral. This study was initiated by the insights gained from the traditional method of controlling respiratory ailments. We propose ‘Emergence’ as the property that dictates the need to use Gedunin and Nimbin along with the other bioactive components of neem leaves as adjuvants against coronaviruses and other viral diseases

Viability and Adaptability of E. coli. and Enterococcus Group to Salt Water with High Concentration of Sodium Chloride

1982 ◽  
Vol 14 (4-5) ◽  
pp. 115-126 ◽  
Author(s):  
T Omura ◽  
M Onuma ◽  
Y Hashimoto
Keyword(s):  
Sodium Chloride ◽  
Salt Water ◽  
The Other ◽  
Type I ◽  
Citrobacter Freundii ◽  
Type Ii ◽  
High Concentration ◽  
E Coli ◽  
Rapid Extinction ◽  
Other Hand

Some experiments were carried out to examine the adaptability of E. coli. and enterococcus group to salt water with high concentration of sodium chloride after the experiments on viability in this salt water. Unlike E. coli. type I, when E.coli. type II was repeatedly exposed to salt water, the survival of E.coli. type II was changed from rapid extinction to multiplication as the experiments went on. At the same time, it was also made clear by means of the IMViC test that E.coli. type II was replaced by Citrobacter freundii as E.coli. type II adapted itself to salt water. The enterococcus group was separated into four distinct types; S. faecalis, S. faecalis var. liquefaciens, S. faecium and S. durans. The results of the experiments on viability in salt water indicated that S. faecalis var. liquefaciens possessed the greatest viability, and S. faecium the weakest. From the results of the experiments on adaptability, it was found that each type of enterococcus group had a different adaptability to salt water. In spite of the weakest viability, S. faecium could adapt itself to salt water as well as S. faecalis and S. faecalis var. liquefaciens. On the other hand, S. durans could not adapt itself to salt water at all.

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