scholarly journals Modulation of Swarming and Virulence by Fatty Acids through the RsbA Protein in Proteus mirabilis

2004 ◽  
Vol 72 (12) ◽  
pp. 6836-6845 ◽  
Author(s):  
Shwu-Jen Liaw ◽  
Hsin-Chih Lai ◽  
Won-Bo Wang
Keyword(s):  
Fatty Acids ◽  
Stearic Acid ◽  
Palmitic Acid ◽  
Proteus Mirabilis ◽  
Lauric Acid ◽  
Myristic Acid ◽  
Biofilm Formation ◽  
Saturated Fatty Acids ◽  
Extracellular Polysaccharide ◽  
Dependent Pathway

ABSTRACT After sensing external signals, Proteus mirabilis undergoes a multicellular behavior called swarming which is coordinately regulated with the expression of virulence factors. Here we report that exogenously added fatty acids could act as signals to regulate swarming in P. mirabilis. Specifically, while oleic acid enhanced swarming, some saturated fatty acids, such as lauric acid, myristic acid, palmitic acid, and stearic acid, inhibited swarming. We also found that expression of hemolysin, which has been shown to be coordinately regulated with swarming, was also inhibited by the above saturated fatty acids. Previously we identified a gene, rsbA, which may encode a histidine-containing phosphotransmitter of the bacterial two-component signaling system and act as a repressor of swarming and virulence factor expression in P. mirabilis. We found that while myristic acid, lauric acid, and palmitic acid exerted their inhibitory effect on swarming and hemolysin expression through an RsbA-dependent pathway, the inhibition by stearic acid was mediated through an RsbA-independent pathway. Biofilm formation and extracellular polysaccharide (EPS) production play an important role in P. mirabilis infection. We found that RsbA may act as a positive regulator of biofilm formation and EPS production. Myristic acid was found to slightly stimulate biofilm formation and EPS production, and this stimulation was mediated through an RsbA-dependent pathway. Together, these data suggest that fatty acids may act as environmental cues to regulate swarming and virulence in P. mirabilis and that RsbA may play an important role in this process.

The effects of a series of saturated fatty acids in the diet on milk-fat secretion in the cow

1968 ◽  
Vol 35 (3) ◽  
pp. 361-370 ◽  
Author(s):  
W. Steele ◽  
J. H. Moore
Keyword(s):  
Fatty Acids ◽  
Stearic Acid ◽  
Palmitic Acid ◽  
Lauric Acid ◽  
Myristic Acid ◽  
Milk Fat ◽  
Volatile Fatty Acids ◽  
Saturated Fatty Acids ◽  
Short Chain Fatty Acids ◽  
Fat Yield

SummaryThe effects of the isocaloric replacement of part of the dietary concentrate mixture by 5% lauric acid (99% pure) or by 10% of myristic (95% pure), palmitic (96% pure) or stearic (94% pure) on the yield and composition of milk fat was investigated in 2 feeding experiments with a total of 10 cows in mid-lactation. The concentrate mixtures were given with a high-roughage diet that supplied 9·1 or 7·7 kg hay/day in expts 1 and 2, respectively.In expt 1 the inclusion of myristic acid in the diet decreased the yields of milk and solids-not-fat (SNF), but increased the percentage of fat in the milk without altering the fat yield. When stearic or palmitic acid was included in the diet there was an increase in milk fat yield; palmitic acid caused the greater increase. In expt 2 the inclusion of lauric acid in the diet did not appear to affect the yields of milk or SNF but it caused large reductions in the percentage of fat in the milk and in the yield of fat.In expt 1 the inclusion of myristic acid increased the yields and percentages of 14:0, 14:1 and 16:1 in the milk fat and decreased the yields and percentages of the short-chain fatty acids (4:0–8:0), 16:0, 18:0 and 18:1. When palmitic acid was included in the diet there were increases in the yields and percentages of 16:0 and 16:1 in the milk fat and decreases in the yields and percentages of 10:0, 12:0, 14:0, 18:0 and 18:1. The inclusion of stearic acid in the diet increased the yields and percentages of 18:0 and 18:1 in the milk fat and decreased the yields and percentages of 12:0 and 16:0. In expt 2 the inclusion of lauric acid in the diet increased the yield and percentage of 12:0, and in 1 cow the content of 14:0 in the milk fat; there were reductions in the yields and percentages of all the other fatty acids in the milk fat. There was no evidence of any marked elongation of the carbon chains of 12:0 and 14:0 in the mammary gland to form 16:0 or 18:0.In expt 1 the incorporation of myristic acid in the diet decreased the concentration of total steam-volatile fatty acids in rumen liquor. The inclusion of either myristic, palmitic or stearic acid in the diet had little effect on the relative proportions of the individual volatile acids in the rumen liquor. In expt 2 the addition of lauric acid to the diet reduced the acetic acid:propionic acid ratio in the rumen liquor.

scholarly journals KOMPOSISI ASAM LEMAK CACING LAUT SIASIA (SIPUNCULUS, SP) DARI PERAIRAN PANTAI PULAU NUSALAUT

2017 ◽  
Vol 4 (1) ◽  
pp. 10-16
Author(s):  
Bernita Silaban
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Stearic Acid ◽  
Eicosapentaenoic Acid ◽  
Lauric Acid ◽  
Coastal Waters ◽  
Myristic Acid ◽  
Palmitoleic Acid ◽  
Fat Content ◽  
Coastal Communities

Background: "Siasia" is a seaworm species in the phylum that includes Sipuncula Sipunculidea class. This animal has been consumed for generations by coastal communities Nusalaut Island, central mollucas but not yet universally known. Until now there has been obtained gisi complete composition. This study aimed to identify the composition of fatty acids contained in vain fresh seaworms. Methods: Seaworms vain taken from coastal waters of Negeri Titawaai and Nalahia Nusalaut Island, Central Moluccas in March 2014. The parameters analyzed include methods is sokhlet fat content and fatty acid by GC method. Results: The results showed fresh siasia fat content 1.12% of coastal waters Titawaai while 1.91% of coastal waters Nalahia. Fatty acids seaworms were identified from coastal waters Titawai  is  kaparat acid (C10: 0), lauric acid (C12: 0), myristic acid (C14: 0), palmitoleic acid (C16: 1), stearic acid (C18: 0), linolenic acid (C18: 3) acid and eicosapentaenoic (C20: 5) while the fatty acids of  seaworm vain of coastal waters Nalahia include is lauric acid (C12: 0), myristic acid (C14: 0), palmitoleic acid ( C16: 1), stearic acid (C18: 0) and eicosapentaenoic acid (C20: 3). Conclusion: The fat content of fresh siasia sea worms is 1.12% from the waters of Titawaai beach, while 1.91% of the waters of the coast of Nalahia.

scholarly journals Fat deposition of broiler chickens fed a high-fat diet contained Sauropus androgynus leaf extract plus turmeric powder

2019 ◽  
Vol 44 (4) ◽  
pp. 382
Author(s):  
K. Kususiyah ◽  
U. Santoso ◽  
Y. Fenita ◽  
A. M. H. Putranto ◽  
S. Suharyanto
Keyword(s):  
Stearic Acid ◽  
Eicosapentaenoic Acid ◽  
Palmitic Acid ◽  
Lauric Acid ◽  
Myristic Acid ◽  
High Fat Diet ◽  
Broiler Chickens ◽  
Cholesterol Content ◽  
Fat Deposition ◽  
High Fat

A factorial design was used to analyzethe influenceofSauropus androgynusleaf extract (SALE) and turmeric powder (TP) on fat deposition in broilers fed high-fat diet. The first factor was the source of fat (6% beef fat and 6% palm oil), and the second factor was SALE plus TP [0 g SALE plus 0 g TP (G1), 9 g SALE plus 0.5 g TP (G2), 18 g SALE plus 0.5 g TP (G3), 9 g SALE plus 1 g TP (G4), 18 g SALE plus 1 g TP (G5)]. SALE plus TP affected cholesterol,lauric acid, myristic acid, palmitic acid, stearic acid and eicosapentaenoic acid contents (p<0.01).Fat sources affected fat, cholesterol, lauric acid, myristic acid, palmitic acid, stearic acid and eicosapentaenoic acid (p<0.01). There was a significant interaction between the two factorson fat, cholesterol, lauric acid, palmitic acid, stearic acid, and eicosapentaenoic acid contents. In conclusion, 18 g SALE plus 1 g TP supplementation to high-fat diet resulted in lower stearic acid, but it resulted in higher eicosapentaenoic acid. Supplementation of SALEplus TPto a high-fat diet lowered cholesterol content and changed fatty acidscomposition.

scholarly journals The Production of Biofuels from Coconut Oil Using Microwave

2015 ◽  
Vol 9 (7) ◽  
pp. 93 ◽  
Author(s):  
A Suryanto ◽  
Suprapto Suprapto ◽  
Mahfud Mahfud
Keyword(s):  
Fatty Acids ◽  
Reaction Time ◽  
Lauric Acid ◽  
Myristic Acid ◽  
Saturated Fatty Acids ◽  
Electrical Power ◽  
Coconut Oil ◽  
Raw Material ◽  
Medium Chain ◽  
Acid Reaction

Biofuels including biodiesel, an alternative fuel, is renewable, environmentally friendly, non-toxic and lowemission energy. The raw material used in this work was coconut oil, which contained saturated fatty acids about90% with medium chain (C8-C12), especially lauric acid and myristic acid. Reaction was conducted in batchreactor assisted by microwave. The purpose of this research was to study the effect of power and NaOH catalystin transesterification enhanced by microwave and to obtain a biofuels (biodiesel and biokerosene) derived fromcoconut oil. The reaction was performed by mixing oil and methanol with mole ratio of 1:6, catalystconcentration of 1% w/w with setting electrical power at 100, 264, 400, 600 and 800 W. The reaction time wasconditioned at of 2.5, 5, 7.5, 10 and 15 min. The results showed that microwave could accelerate thetransesterification process to produce biodiesel using NaOH catalyst. The highest yield of biodiesel was 97.76 %,or 99.05 % conversion at 5 min reaction, meanwhile biokerosene was 48% after distillation.

scholarly journals Metabolic fate of oleic acid, palmitic acid and stearic acid in cultured hamster hepatocytes

1996 ◽  
Vol 316 (3) ◽  
pp. 847-852 ◽  
Author(s):  
Jennifer S. BRUCE ◽  
Andrew M. SALTER
Keyword(s):  
Fatty Acids ◽  
Oleic Acid ◽  
Fatty Acid ◽  
Stearic Acid ◽  
Palmitic Acid ◽  
Ketone Bodies ◽  
Plasma Cholesterol ◽  
Saturated Fatty Acids ◽  
Metabolic Fate ◽  
Cellular Phospholipid

Unlike other saturated fatty acids, dietary stearic acid does not appear to raise plasma cholesterol. The reason for this remains to be established, although it appears that it must be related to inherent differences in the metabolism of the fatty acid. In the present study, we have looked at the metabolism of palmitic acid and stearic acid, in comparison with oleic acid, by cultured hamster hepatocytes. Stearic acid was taken up more slowly and was poorly incorporated into both cellular and secreted triacylglycerol. Despite this, stearic acid stimulated the synthesis and secretion of triacylglycerol to the same extent as the other fatty acids. Incorporation into cellular phospholipid was lower for oleic acid than for palmitic acid and stearic acid. Desaturation of stearic acid, to monounsaturated fatty acid, was found to be greater than that of palmitic acid. Oleic acid produced from stearic acid was incorporated into both triacylglycerol and phospholipid, representing 13% and 6% respectively of the total after a 4 h incubation. Significant proportions of all of the fatty acids were oxidized, primarily to form ketone bodies, but by 8 h more oleic acid had been oxidized compared with palmitic acid and stearic acid.

scholarly journals KOMPOSISI ASAM LEMAK CACING LAUT SIASIA (Sipunculus, SP) DARI PERAIRAN PANTAI PULAU NUSALAUT

2017 ◽  
Vol 3 (2) ◽  
pp. 107-114
Author(s):  
Bernita Br Silaban
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Stearic Acid ◽  
Eicosapentaenoic Acid ◽  
Linolenic Acid ◽  
Lauric Acid ◽  
Coastal Waters ◽  
Myristic Acid ◽  
Palmitoleic Acid ◽  
Fat Content

Background: "Siasia" is a seaworm species in the phylum that includes Sipuncula Sipunculidea class. This animal has been consumed for generations by coastal communities Nusalaut Island, central mollucas but not yet universally known. Until now there has been obtained gisi complete composition. This study aimed to identify the composition of fatty acids contained in vain fresh seaworms. Method: Seaworms vain taken from coastal waters of Negeri Titawaai and Nalahia Nusalaut Island, Central Moluccas in March 2014. The parameters analyzed include methods is sokhlet fat content and fatty acid by GC method. Result: The results showed fresh siasia fat content 1.12% of coastal waters Titawaai while 1.91% of coastal waters Nalahia. Fatty acids seaworms were identified from coastal waters Titawai  is  kaparat acid (C10: 0), lauric acid (C12: 0), myristic acid (C14: 0), palmitoleic acid (C16: 1), stearic acid (C18 : 0), linolenic acid (C18: 3) acid and eicosapentaenoic (C20: 5) while the fatty acids of  seaworm vain of coastal waters Nalahia include is lauric acid (C12: 0), myristic acid (C14: 0), palmitoleic acid ( C16: 1), stearic acid (C18: 0) and eicosapentaenoic acid (C20: 3). Conclusion: Siasia fatty acid from Titawai waters of the identified seven seas of each capsic acid (C10: 0), lauric acid (C12: 0), myristic acid (C14: 0), palmitoleic acid (C16: 1) , Stearic acid (C18: 0), linolenic acid (C18: 3) and eicosapentaenoic acid (C20: 5) whereas Siasia fatty acids from Nalahia's coastal waters were identified as five lauric acid (C12: 0), myristic acid (C14: 0), palmitoleic acid (C16: 1), stearic acid (C18: 0) and eicosapentaenoic acid (C20: 3).

scholarly journals Fatty Acids and Frailty: A Mendelian Randomization Study

Nutrients ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 3539
Author(s):  
Yasutake Tomata ◽  
Yunzhang Wang ◽  
Sara Hägg ◽  
Juulia Jylhävä
Keyword(s):  
Fatty Acids ◽  
Confidence Interval ◽  
Stearic Acid ◽  
Palmitic Acid ◽  
Unsaturated Fatty Acids ◽  
Mendelian Randomization ◽  
Saturated Fatty Acids ◽  
Frailty Index ◽  
Nucleotide Polymorphisms ◽  
Alpha Linolenic Acid

Background: Observational studies have suggested that fatty acids such as higher levels of n-3 polyunsaturated fatty acids (PUFAs) may prevent frailty. By using Mendelian randomization analysis, we examined the relationship between fatty acids and frailty. Methods: We used summary statistics data for single-nucleotide polymorphisms associated with plasma levels of saturated fatty acids (palmitic acid, stearic acid), mono-unsaturated fatty acids (MUFAs) (palmitoleic acid, oleic acid), n-6 PUFAs (linoleic acid, arachidonic acid), and n-3 PUFAs (alpha-linolenic acid, eicosapentaenoic acid, docosapentaenoic acid, docosahexaenoic acid), and the corresponding data for frailty index (FI) in 356,432 individuals in the UK Biobank. Results: Although there were no robust associations on the MUFAs or the PUFAs, genetically predicted higher plasma stearic acid level (one of saturated fatty acids) was statistically significantly associated with higher FI (β = 0.178; 95% confidence interval = −0.050 to 0.307; p = 0.007). Such a relationship was also observed in a multivariate MR (β = 0.361; 95% confidence interval = 0.155 to 0.567; p = 0.001). Genetically predicted higher palmitic acid was also significantly associated with higher FI (β = 0.288; 95% confidence interval = 0.128 to 0.447; p < 0.001) in the multivariate MR analysis. Conclusions: The present MR study implies that saturated fatty acids, especially stearic acid, is a risk factor of frailty.

scholarly journals Changes of the fatty acid composition of sprouts during germination

2010 ◽  
pp. 89-92
Author(s):  
Melinda-Rita Márton ◽  
Sándor Szép ◽  
Zsolt Mándoki ◽  
Melinda Tamás ◽  
Salamon Rozália Veronika ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Stearic Acid ◽  
Palmitic Acid ◽  
Acid Composition ◽  
Sunflower Seed ◽  
Unsaturated Fatty Acids ◽  
Saturated Fatty Acids ◽  
Fat Content

During our research we studied the fat content and fatty acid composition during the germination and sprouting periods of the most important sprouts: wheat, lentil, alfalfa, radish and sunflower seed. In this article we present our research results during this sprouting study. The concentration of the saturated fatty acids (palmitic acid, stearic acid) decreased, the concentration of the unsaturated fatty acids increased during germination, but the tendency was not so high than was published in the literature.

scholarly journals GC-MS and Antioxidant Capacity Analysis in Propanol Extract of Carthamus tinctorious L

2021 ◽  
Vol 8 (1) ◽  
pp. 67
Author(s):  
Sri Indriati ◽  
Muhammad Yusuf ◽  
Riskayanti Riskayanti ◽  
Nur Amaliah ◽  
Mahyati Latief ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Linoleic Acid ◽  
Stearic Acid ◽  
Palmitic Acid ◽  
Lauric Acid ◽  
Myristic Acid ◽  
Capacity Analysis ◽  
Time Intervals ◽  
Maximum Extraction ◽  
Maximum Content

Safflower, were extracted using propanol solvent at different time intervals: 10, 20, and 30 min at a constant temperature of 40°C. The extracts were analyzed by GC/MS technique. The major compounds identified were tetrapentacontane, tetracontane, triacontanol, gamma sitosterol, myristic acid, linoleic acid, stearic acid, palmitic acid, oleic acid, and lauric acid. However, some levels of palmidrol, beta-amyrin, cubenol, and tocopherol were also found in safflower extracts. Most of the volatile compounds were detected between 10–30 min time of extraction. The 30 min time of extraction also showed the maximum content of polyphenols and antioxidants in safflower extracts. Thus, 30 min was suggested as the most suitable time for maximum extraction of bioactive volatiles, antioxidants, and polyphenols from Safflower using propanol solvent.

scholarly journals Hindering of Cariogenic Streptococcus mutans Biofilm by Fatty Acid Array Derived from an Endophytic Arthrographis kalrae Strain

Biomolecules ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 811 ◽  
Author(s):  
Marwa M. Abdel-Aziz ◽  
Tamer Emam ◽  
Marwa M. Raafat
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Streptococcus Mutans ◽  
Biofilm Formation ◽  
Inhibitory Concentration ◽  
Unsaturated Fatty Acids ◽  
Saturated Fatty Acids ◽  
Extracellular Polysaccharide ◽  
Gas Chromatography Mass Spectrometry ◽  
Exopolysaccharides Production

Streptococcus mutans has been considered as the major etiological agent of dental caries, mostly due to its arsenal of virulence factors, including strong biofilm formation, exopolysaccharides production, and high acid production. Here, we present the antivirulence activity of fatty acids derived from the endophytic fungus Arthrographis kalrae isolated from Coriandrum sativum against Streptococcus mutans. The chemical composition of the fatty acids was analyzed by gas chromatography–mass spectrometry GC-MS and revealed nine compounds representing 99.6% of fatty acids, where unsaturated and saturated fatty acids formed 93.8% and 5.8 % respectively. Oleic and linoleic acids were the major unsaturated fatty acids. Noteworthy, the fatty acids at the concentration of 31.3 mg L–1 completely inhibited Streptococcus mutans biofilm, and water insoluble extracellular polysaccharide production in both polystyrene plates, and tooth model assay using saliva-coated hydroxyapatite discs. Inhibition of biofilm correlated significantly and positively with the inhibition of water insoluble extracellular polysaccharide (R = 1, p < 0.0001). Furthermore, Arthrographis kalrae fatty acids at a concentration of 7.8 mg L–1 exhibited acidogenesis-mitigation activity. They did not show bactericidal activity against Streptococcus mutans and cytotoxic activity against human oral fibroblast cells at the concentration used. On the other hand, saliva-coated hydroxyapatite discs treated with sub-minimum biofilm inhibitory concentration of fatty acids showed disturbed biofilm architecture with a few unequally distributed clumped matrices using fluorescence microscopy. Our findings revealed that the intracellular fatty acid arrays derived from endophytic Arthrographis kalrae could contribute to the biofilm-preventing alternatives, specifically Streptococcus mutans biofilms.

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