scholarly journals Pleurotus ostreatus as a Biocatalyst to Obtain Bicyclic Hydroxylactones with Three or Four Methyl Groups

Catalysts ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 643
Author(s):  
Małgorzata Grabarczyk ◽  
Wanda Mączka ◽  
Katarzyna Wińska ◽  
Adrianna Kondas ◽  
Barbara Żarowska ◽  
...  
Keyword(s):  
Pleurotus Ostreatus ◽  
Spectroscopic Data ◽  
Complete Inhibition ◽  
Methyl Groups ◽  
Microbial Transformations ◽  
Inhibition Of Growth ◽  
Unsaturated Lactones

The purpose of the study was to explore microbial transformations in cultures of basidiomycetes Pleurotus ostreatus, two bicyclic unsaturated lactones occurring in the form of two diastereoisomers. Some of these strains were able to transform unsaturated lactones into four known and three new derivatives. The structures of all lactones were established on the basis of spectroscopic data. Both substrates and products caused a complete inhibition of growth of A. alternata and F. linii strains.

scholarly journals Influence of hydroxyurea on the course of germination and growth of rape (Brasica napus L.) seedlings

2015 ◽  
Vol 47 (1–2) ◽  
pp. 131-141 ◽  
Author(s):  
M. Kuraś ◽  
H. Teleżyński
Keyword(s):  
Mitochondrial Dna ◽  
Root Growth ◽  
Dna Synthesis ◽  
Elongation Growth ◽  
Complete Inhibition ◽  
Hypocotyl Growth ◽  
Prolonged Incubation ◽  
Inhibition Of Growth ◽  
Germination And Growth ◽  
Mitochondrial Dna Synthesis

The effects of continuous incubation in hydroxyurea (HU) solutions (0.2, 0.4, 0.8 mg/ml) on germination of rape seeds and growth of young seedling axes were studied during 132 hours from initial soaking. Germination turned out to be unaffected by the treatment. Root growth was first increasingly inhibited by the HU concentration tested, but after prolonged incubation a complete arrest of the root growth was noted at all HU concentrations. The elongation growth of hypocotyls was found to be stimulated by a HU 0.2 mg/ml concentration while it was markedly suppressed by 0.4 mg/ml, and completely arrested by 0.8 mg/ml Inhibition of growth of the upright hypocotyl part at higher HU concentration was found to be accompanied by the unbending of the hooked under-cotyledonary part. It is suggested that inhibition of nuclear endomitotic DNA synthesis In elongating hypocotyl cells, suppresses only partially their growth, whereas a complete inhibition of the hypocotyl growth results from arrest of the mitochondrial DNA synthesis.

scholarly journals Inhibition of growth and sporulation of Penicillium expansum by extracts of selected Basidiomycetes

2014 ◽  
Vol 69 (4) ◽  
pp. 263-267 ◽  
Author(s):  
Teresa Florianowicz
Keyword(s):  
Antifungal Activity ◽  
Pleurotus Ostreatus ◽  
Mycelial Growth ◽  
Penicillium Expansum ◽  
Aqueous Extracts ◽  
Coprinus Comatus ◽  
Inhibition Of Growth

A screening of antifungal activity of 33 Basidiomycetes strains was realized with their extracts. The influence of aqueous extracts of fruit-bodies of the testeded fungi after addition of spores or hyphae of <em>Penicillium expansum</em> on growth and sporulation of the fitopathogen in vitro was estimated. The species: <em>Hydnum repandum</em> L.: Fr., <em>Pleurotus ostreatus</em> (Jacq.: Fr.) Kummer, <em>Coprinus comatus</em> (Műll Fr.) S.F. Gray, <em>Coprinus atramentarius</em> (Bull: Fr.) Fr. and <em>Lactarius turpis</em> (Weinm.) Fr. reduced the mycelial growth and inhibited sporulation of this pathogen.

scholarly journals Synthesis and Biotransformation of Bicyclic Unsaturated Lactones with Three or Four Methyl Groups

Molecules ◽  
2017 ◽  
Vol 22 (1) ◽  
pp. 147 ◽  
Author(s):  
Katarzyna Wińska ◽  
Małgorzata Grabarczyk ◽  
Wanda Mączka ◽  
Adrianna Kondas ◽  
Gabriela Maciejewska ◽  
...  
Keyword(s):  
Methyl Groups ◽  
Unsaturated Lactones

scholarly journals New Bromo- and Iodo-Hydroxylactones with Two Methyl Groups Obtained by Biotransformation of Bicyclic Halolactones

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 73
Author(s):  
Małgorzata Grabarczyk ◽  
Wanda Mączka ◽  
Gabriela Maciejewska ◽  
Katarzyna Wińska
Keyword(s):  
Chemical Synthesis ◽  
Filamentous Fungi ◽  
Spectroscopic Data ◽  
Halogen Atom ◽  
Lactone Ring ◽  
Fusarium Culmorum ◽  
Cyclohexane Ring ◽  
Fusarium Avenaceum ◽  
Methyl Groups ◽  
The Subject

The subject of the research was to determine the ability of the filamentous fungi to biotransform bicyclic halolactones containing two methyl groups in their structure. By chemical synthesis three bicyclic halolactones with two methyl groups, one in the cyclohexane ring and one in the lactone ring, were obtained: 2-chloro-4,7-dimethyl-9-oxabicyclo[4.3.0]nonan-8-one, 2-bromo-4,7-dimethyl-9-oxabicyclo[4.3.0]nonan-8-one, and 2-iodo-4,7-dimethyl-9-oxabicyclo[4.3.0]nonan-8-one. These compounds were formed as mixtures of two diastereoisomers. The obtained halolactones (as mixture of two diastereoisomers) were subjected to screening biotransformation with the use of eight strains of filamentous fungi: Fusarium culmorum AM10, F. avenaceum AM12, F. semitectum AM20, F. solani AM203, Absidia coerulea AM93, A. cylindrospora AM336, Penicillium chermesinum AM113, P. frequentans AM351. Two of the substrates, 2-bromo-4,7-dimethyl-9-oxabicyclo[4.3.0]nonan-8-one and 2-iodo-4,7-dimethyl-9-oxabicyclo[4.3.0]nonan-8-one, were hydroxylated without removing the halogen atom from the molecule, giving 2-bromo-7-hydroxy-4,7-dimethyl-9-oxabicyclo[4.3.0]nonan-8-one, 2-bromo-5-hydroxy-4,7-dimethyl-9-oxabicyclo[4.3.0]nonan-8-one, and 2-iodo-7-hydroxy-4,7-dimethyl-9-oxabicyclo[4.3.0]nonan-8-one as products. The hydroxylation capacity was demonstrated by strains of Absidia cylindrospora AM336, Fusarium avenaceum AM12, and F. solani AM203. The structures of all lactones were determined on the basis spectroscopic data.

Characterization and nutritional properties of Methanothrix concilii sp. nov., a mesophilic, aceticlastic methanogen

1984 ◽  
Vol 30 (11) ◽  
pp. 1383-1396 ◽  
Author(s):  
G. B. Patel
Keyword(s):  
Acetic Acid ◽  
Growth Conditions ◽  
Complete Inhibition ◽  
Methane Formation ◽  
Methanogenic Bacterium ◽  
Nutritional Properties ◽  
Dna Base Composition ◽  
Inhibition Of Growth ◽  
Dna Base ◽  
Optimum Ph

A nonmotile, rod-shaped, nonspore-forming, mesophilic methanogenic bacterium was isolated from sewage sludge. The cells stained Gram negative. In the presence of CO2, the isolate was able to grow and produce significant amounts of methane from acetic acid. No growth or methane formation was observed when H2, methanol, pyruvate, propionate, butyrate, formate, or trimethylamine were provided as substrates in the presence of CO2. About 0.95 mol of CH4 was produced per mole of acetic acid consumed. The optimum pH and temperature for growth were 7.1–7.5 and 35–40 °C, respectively. The mass doubling time was about 24 h under optimum growth conditions. The almost complete inhibition of methane formation by 10 μM 2-bromoethanesulfonic acid (2-BES) was reversed in the presence of 50 μM 2-mercaptoethanesulfonic acid (HS-CoM). D-Cycloserine at 0.1 mg/mL concentration caused complete inhibition of growth. Sludge fluid enhanced the rate of methane formation, whereas 0.5% (w/v) yeast extract was inhibitory. The optimum initial CO2 (added as NaHCO3) for growth on acetic acid was 1.8 mM. The DNA base composition was 61.25 ± 0.60 mol% G + C. On the basis of its characteristics, this isolate is classified as Methanothrix concilii sp. nov. and the type strain is GP6 (=NRC 2989).

Organoamidometallics. V. Syntheses of [N,N-diethyl-N'-polyfluorophenyl-ethane-1,2-diaminato(1-)]platinum(II) Complexes by Decarboxylation Reactions, and the X-Ray Crystal Structure of trans-[Pt(NC6F5CH2CH2Net2)I(Py)]

1991 ◽  
Vol 44 (12) ◽  
pp. 1669 ◽  
Author(s):  
GB Deacon ◽  
BM Gatehouse ◽  
J Ireland
Keyword(s):  
Crystal Structure ◽  
Double Bond ◽  
Spectroscopic Data ◽  
Coupling Constants ◽  
Methyl Groups ◽  
Triclinic Space Group ◽  
Double Bond Character ◽  
X Ray ◽  
Square Planar ◽  
Bond Character

From reactions between PtX2( deen ) (X=I, Br or Cl ; deen = N,N-diethylethane-1,2-diamine), thallous pentafluorobenzoate or 2,3,5,6-tetrafluorobenzoate, and the appropriate polyfluorobenzene in pyridine (py) or 4-methylpyridine ( mepy ), the organoamidoplatinum (II) complexes [Pt(NRCH2CH2Net2)X(L)](R = p-HC6F4 or C6F5, X = 1, Br or Cl , L = py; R = p-HC6F4, X = I, L = mepy ; R = p-MeC6F4 or p-IC6F4, X = I, L = py; R = 2,3,5-F3C6H2, X = Br, L = py) have been prepared. The X-ray crystal structure of [Pt(NC6F5CH2CH2Net2)I(py)](triclinic, space group Pī (No. 2), a 9.308(1), b 9.615(2), C 11.143(2)Ǻ, α 88.70(2),β 88.58(1), γ 89.60(2)°, R 0.0518, Rw 0.0704 for 3237 observed reflections) shows the complex to have square planar stereo-chemistry with py trans to NEt2 and NC6F5 trans to iodine. The stereochemistry of the amido nitrogen approaches triangular (sum of angles 353°) and the N-C6F5 bond has partial double-bond character. Surprisingly, the ethyl substituents have a configuration in which the methyl groups are orientated back towards platinum. Other [Pt(NRCH2CH2Net2)X(L)] complexes are considered to have similar stereochemistry on the basis of comparison of spectroscopic data, particularly 3JPt,H(py) and 3JPt,H(CH2) coupling constants.

A weakly coordinating anion as a tripodal “Br3”-ligand for platinum(IV) — Structure of [(closo-CB11H6Br6)PtMe3]

2009 ◽  
Vol 87 (1) ◽  
pp. 95-102 ◽  
Author(s):  
Antonio G De Crisci ◽  
Jesse Kleingardner ◽  
Alan J Lough ◽  
Anna Larsen ◽  
Ulrich Fekl
Keyword(s):  
Nmr Spectroscopy ◽  
Spectroscopic Data ◽  
Octahedral Geometry ◽  
Metal Center ◽  
Methyl Groups ◽  
Coupling Constant ◽  
Bond Lengths ◽  
Trans Influence ◽  
Lower Hemisphere ◽  
Weakly Coordinating

Synthesis, structure, and NMR spectroscopic data for [(closo-CB11H6Br6)PtMe3] are reported. This neutral platinum(IV) complex contains the closo-CB11H6Br6– anion bonded to the trimethylplatinum(IV) cation via three boron-bound bromines. Closo-CB11H6Br6–, which often acts as weakly coordinating or even non-coordinating anion, adopts here a role still very rare for this anion: it acts as a tripodal capping ligand enabling a pseudo-octahedral geometry at a d6 metal center. Three bromines from the lower hemisphere of the hexahalogenated carboranate coordinate to Pt(IV), and distortions from ideal octahedral angles at Pt are marginal (<3°). Pt-Br bond lengths are 2.7279(18), 2.7129(17), and 2.7671(18) Å. Using the 2JPtH coupling constant of Pt-bonded methyl groups (79.0 Hz) as indicator of the donor strength of the tripodal cap, the prediction is obtained that closo-CB11H6Br6– is a relatively weak donor toward the trimethylplatinum(IV) cation. Ligand competition equilibria can be expected to depend on both the intrinsic donor strengths of competing ligands and on the effects of charge and geometry. We observe that closo-CB11H6Br6– is capable of replacing acetone from Me3Pt(acetone)3+, whereas BF4– counterion is unable to replace acetone under similar conditions.Key words: non-coordinating anion, platinum(IV), trimethyl, closo-carboranate, tripodal, trans-influence, NMR spectroscopy.

scholarly journals Determining the Efficacy of IonatorEXP™ Activated Tap Water on Growth of Staphyloccocus aures and Escherichia coli.

2012 ◽  
Vol 10 (4) ◽  
Author(s):  
Sara Schiedler ◽  
Rachelle Peterson ◽  
Sasha Showsh ◽  
Thao Yang
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Growth Inhibition ◽  
Tap Water ◽  
Complete Inhibition ◽  
Bacterial Strains ◽  
Inhibition Of Growth

The efficacy in growth inhibition of Staphylococcus aureus and Escherichia coli of the IonatorEXP™ activated tap water was compared to plain tap water, Quatsyl™, and Butchers Neutral Disinfectant™. Treatment with Quatsyl™ or Butchers Morning Mist™ Neutral Disinfectant resulted in complete inhibition of growth for both S. aureus and E.coli. Treatments with IonatorEXP™ activated tap water, performed as directed by the manufacturer, or plain tap water, resulted in no observable inhibition of growth for either of the bacterial strains tested. This observation is not unexpected given that analysis of pH, conductivity and H2O2 on IonatorEXP™ activated tap water were statistically the same values as those determined for plain tap water that was not activated by the IonatorEXP™.

scholarly journals New Unsaturated Lactones and a Meroterpenoid from Ganoderma lucidum

2019 ◽  
Vol 14 (7) ◽  
pp. 1934578X1985881
Author(s):  
Qi-Hang Xin ◽  
Qi Luo ◽  
Ze-Hong Wu ◽  
Jiao-Jiao Zhang ◽  
Li-Zhong Liu ◽  
...  
Keyword(s):  
Ganoderma Lucidum ◽  
Spectroscopic Data ◽  
Specific Rotation ◽  
Positive Control ◽  
Fruiting Bodies ◽  
Chemical Structures ◽  
Inhibitory Activities ◽  
Unsaturated Lactones

From the dried fruiting bodies of Ganoderma lucidum, 2 new unsaturated lactones, dayaolingzhilactones A and B (1 and 2), and 1 new meroterpenoid, dayaolingzhiol H (3), together with 10 known compounds (4-13), were isolated. Their chemical structures were identified by using spectroscopic data and calculated specific rotation. The inhibitory activities of compounds 1 and 2 toward acetylcholinesterase (AchE) were assessed in vitro with tacrine as the positive control. Both of them exhibited moderate AchE inhibitory activities at the concentration of 50 μM.

Models of Cataclysmic Variables from Photometric and Spectroscopic Data

1979 ◽  
Vol 46 ◽  
pp. 65-74 ◽  
Author(s):  
A.C. Fabian ◽  
J.E. Pringle ◽  
J.A.J. Whelan ◽  
J.A. Bailey
Keyword(s):  
Spectroscopic Data ◽  
Cataclysmic Variables ◽  
System Parameters ◽  
Dwarf Nova ◽  
Spectroscopic Observations ◽  
Photometric And Spectroscopic Observations

Abstract.Recent photometric and spectroscopic observations of the dwarf nova system Z Cha are discussed. Methods for constraining the system parameters are applied and the disc emissivity is deduced as a function of radius. Indications are found that the disc shrinks in size with increasing time after outburst.

Sign in / Sign up

Export Citation Format

Share Document