Fungi in Fox Spots of a Drawing by Leon Wyczółkowski

2014 ◽  
Vol 35 (2) ◽  
Author(s):  
Joanna Karbowska-Berent ◽  
Joanna Jarmiłko ◽  
Jolanta Czuczko
Keyword(s):  
Yellow Powder ◽  
Light Yellow Powder ◽  
Naked Eye ◽  
Light Yellow ◽  
Paper Point

AbstractMany authors dealing with the phenomenon of foxing on paper point out its microbiological origin, but in fact, foxing-causing fungi can rarely be cultured. Leon Wyczółkowski’s drawing “The Market in Gniew” is an exception in this respect: its paper carrier shows foxing as well as numerous hyphae and cleistothecia, visible to the naked eye either as a white and fluffy coating or as a light yellow powder. Our aim was to investigate their role in the formation of foxing. Microscopic observations revealed uncountable amounts of lenticular spores and spherical asci. Incubation of the yellowish powder on microbiological media enabled the isolation of five strains:

scholarly journals Über Oxostannate(II), IV [1] Zur Kenntnis von Rb2SnO2 und K2SnO2 [2] / On Oxostannates(II), IV Rb2SnO2 and K2SnO2

1982 ◽  
Vol 37 (6) ◽  
pp. 688-694 ◽  
Author(s):  
Rolf M. Braun ◽  
Rudolf Hoppe
Keyword(s):  
Single Crystals ◽  
Lattice Energy ◽  
Yellow Powder ◽  
Light Yellow Powder ◽  
Ionic Radii ◽  
Space Group ◽  
Coordination Numbers ◽  
Binary Oxides ◽  
Light Yellow ◽  
Brown Powder

Abstract The new compound Rb2SnO2 was obtained as a light yellow powder by heating mixtures of the binary oxides (RbO0.48 + SnO, Rb: Sn = 2:1) under argon (sealed Ag cylinders, 600 °C, 3d). Subsequent annealing (550 °C, 8d and 500 °C, 17 d) led to light yellow transparent single crystals. Rb2SnO2 is extremely sensitive to moisture and decomposes into black products. It crystallizes orthorhombicly in the space group P212121-D42, with a = 5.761, b = 7.493, c= 11.167 Å, Z = 4, drö = 4.43 and dpyk = 4.46 gcm-3 , R= 11.8 and Rw = 12.0%. Effective Coordination Numbers, ECoN, these via Mean Fictive Ionic Radii, MEFIR, and the Madelung Part of Lattice Energy, MAPLE, have been calculated. Isotypic K2SnO2 was obtained similarly as a brown powder, a = 5.579, b = 7.246, c = 16.744 Å.

scholarly journals Synthesis of N-methyl-4-piperidone Curcumin Analogues and Their Cytotoxicity Activity against T47D Cell Lines

2018 ◽  
Vol 18 (2) ◽  
pp. 362 ◽  
Author(s):  
Yum Eryanti ◽  
Rudi Hendra ◽  
Tati Herlina ◽  
Adel Zamri ◽  
Unang Supratman
Keyword(s):  
Condensation Reaction ◽  
Yellow Crystal ◽  
T47d Cell ◽  
Crystal Form ◽  
Moderate Activity ◽  
Light Yellow Powder ◽  
Cytotoxicity Activity ◽  
Curcumin Analogues ◽  
Light Yellow ◽  
Ic50 Value

Three piperidone curcumin analogues (N-methyl-(3E,5E)-3,5-bis-(2-chlorobenzylidene)-4-piperidone (1), N-methyl-(3E,5E)-3,5-bis-(3-bromobenzylidene)-4-piperidone (2) and N-methyl-(3E,5E)-3,5-bis-(4-chlorobenzylidene)-4-piperidone (3)) were synthesized from N-methyl-4-piperidone with halogenbenzaldehyde, 2-chlorobenzaldehyde, 3-bromobenzaldehyde and 4-chlorobenzaldehyde. The Claisen-Schmidt condensation reaction was used in alkali condition with combinatorial. All the compounds showed light yellow needle, light yellow powder, and yellow crystal form with percentage of yield 39, 66, and 40%, respectively. All the structure compounds were confirmed by using UV, IR, 13C-NMR, 1H-NMR and MS. Apart from that, the cytotoxicity results against breast cancer cell (T47D) showed strong to moderate activity with the IC50 value 8, 4, and 45 µg/mL, respectively.

Photosensitive polystyrene/silver bromide hybrid colloidal crystals as recoverable colorimetric naked eye probes for bromine gas sensing

2016 ◽  
Vol 4 (7) ◽  
pp. 1386-1391 ◽  
Author(s):  
Bing Yu ◽  
Feng Zhai ◽  
Hailin Cong ◽  
Di Yang
Keyword(s):  
Linear Relationship ◽  
Gas Sensing ◽  
Colloidal Crystal ◽  
Colloidal Crystals ◽  
Silver Bromide ◽  
Gas Concentration ◽  
Naked Eye ◽  
Light Yellow ◽  
Reliable Performance ◽  
Deep Green

The color of a hybrid colloidal crystal sensor is changed from deep green to light yellow with increased bromine gas concentrations with a linear relationship between the band gap shift and bromine gas concentration. The sensor has a very reliable performance after repeated sensing and regeneration.

Fluoride anion sensing using colorimetric reagents containing binaphthyl moiety and urea binding site

2009 ◽  
Vol 63 (6) ◽  
Author(s):  
Roman Mikláš ◽  
Peter Kasák ◽  
Ferdinand Devínsky ◽  
Martin Putala
Keyword(s):  
Color Change ◽  
Colorimetric Detection ◽  
Fluoride Anion ◽  
Urea Derivatives ◽  
Anion Sensing ◽  
Naked Eye ◽  
Spectral Changes ◽  
Light Yellow ◽  
Nmr Data ◽  
Sensor Molecules

AbstractFour 1,1′-binaphthalene based bis-urea derivatives bearing aryl groups at end-on nitrogen atoms IIIa–d were synthesized as potential sensor molecules. These receptors show characteristic UV-VIS spectral changes on complexation with anions and they exhibit selective recognition of F− over other halide anions. Interaction of a fluoride anion with urea NH groups was confirmed by 1H NMR data. The presence of an electron-withdrawing nitro group in N′-aryls (receptors IIIa and IIIb) appeared to be necessary for naked-eye colorimetric detection. These receptors show dramatic color change from light-yellow to orange (IIIa) or to orange-red (IIIb) in the presence of guest fluoride anions already at concentrations of 10−5 mol dm−3 of the receptor and host.

Preparation and Photocatalytic Activity of Yellow Titania

2013 ◽  
Vol 743-744 ◽  
pp. 849-856 ◽  
Author(s):  
Lin Li ◽  
Sheng Qi Xi ◽  
Yang Nan Xing ◽  
Fei Hu Shang
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Light Response ◽  
Yellow Powder ◽  
X Ray ◽  
Titania Powder ◽  
Light Yellow ◽  
Transmission Electron

Titania powder was prepared by a sol-gel method and heat-treatment (HT). The morphology and structure of the titania powder were characterized by X-ray diffraction (XRD), differential thermal analysis, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of powder was investigated using methyl orange as target compound. Colour changing of powder was due to colour centers form. Under visible light, yellow powder showed the better photocatalytic activity than P25 powder and its visible light response was expanded. Preparation of yellow powder lowered conventional calcinations temperature obviously.

scholarly journals SYNTHESIS AND PHYSICOCHEMISTRY PROPERTIES PREDICTION OF A NEW POTENTIAL ANTI-INFLAMMATORY AGENT: DIACETYL PENTAGAMAVUNON-1

2010 ◽  
Vol 6 (1) ◽  
pp. 94-98
Author(s):  
Supardjan A. Margono ◽  
Pudjono Pudjono ◽  
St. Layli Prasojo ◽  
Jeffry Julianus ◽  
Enade Perdana Istyastono
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Quantum Chemical ◽  
Structure Elucidation ◽  
High Performance ◽  
Light Yellow Powder ◽  
Inflammatory Agent ◽  
Light Yellow ◽  
Infra Red ◽  
Anti Inflammatory ◽  
Semiempirical Quantum Chemical Calculations

Synthesis and physicochemistry properties prediction of a potential anti-inflammatory agent, diacetyl pentagamavunon-1 (diacetyl PGV-1), has been done. The synthesis was using pentagamavunon-1 (PGV-1) (2,87x10-3 mole) and anhydride acetic acid (26x10-3 mole; 37x10-3 mole; 49x10-3 mole) as starting materials and NaOH ethanolic as a catalyst. The AM1 semiempirical quantum-chemical calculations using the computational chemistry approach was used to predict and compare the physicochemisty properties of diacetyl PGV-1 to PGV-1. Odorless, light-yellow powder has been obtained. The powder was 0.8512-0.9602 g (2.02 x10-3 - 2.22x10-3 mole; 70.4-77.4%) and the purity of the powder was 92.4%. The purity of the product has been examined by high performance liquid chromatography (HPLC), while the structure elucidation has been done using IR (Infra Red), 1H-NMR (Nuclear Magnetic Resonance) and MS (Mass Spectroscopy). The physicochemisty properties prediction showed that diacetyl PGV-1 was more hydrophobic than PGV-1.   Keywords: Anti-inflammatory, PGV-1, diacetyl PGV-1, AM1

scholarly journals Sintesis Senyawa Turunan Amoksilin Dan Uji Aktivitas Antibakterinya Terhadap Bakteri Salmonella typhi

2019 ◽  
Vol 2 (2) ◽  
pp. 90-97
Author(s):  
Hadi Barru Hakam Fajar Siddiq ◽  
Dewi Rashati ◽  
Dewi Riskha Nurmalasari
Keyword(s):  
Melting Point ◽  
Ph Value ◽  
Salmonella Typhi ◽  
Dilution Method ◽  
Clear Zone ◽  
Light Yellow Powder ◽  
Melting Point Determination ◽  
Light Yellow ◽  
Point Determination ◽  
Ftir Spectrophotometry

The synthesis of amoxicillin derivate has been done by reacting amoxicillin with 4-t-butylbenzoil chloride. The product was characterized by organoleptic test, melting point determination, TLC, UV/Vis Spectrophotometry, and FTIR Spectrophotometry. Antibacterial activity of amoxicillin derivative against Salmonella typhi were tested using dilution method. Result showed that the product has characteristic as follow: light yellow powder, bitter bite, melting point of 132 °C, Rf value of 0.86, pH value of 7.7, maximum wavelength (uv) of 286 nm. Moreover, FTIR spectra of amoxicillin derivate exhibited peaks at 3271 cm-1 (-NH amine), 2962 cm-1 (-CH aromatic), 1633 cm-1 (-C=O ketone), and other. Antibacterial test showed that amoxicillin derivate was unable to form a clear zone around the disc paper. Amoxicillin derivate cannot be used for the treatment of Salmonella typhi.

scholarly journals Methyl-3-(2-hidroxy-5-nitrophenyl amino)-3-phenylpropanoate Based Colorimetric Sensor for Oxyanions

2020 ◽  
Vol 20 (2) ◽  
pp. 257
Author(s):  
Venty Suryanti ◽  
Fajar Rakhman Wibowo ◽  
Sekar Handayani
Keyword(s):  
Absorption Spectroscopy ◽  
Binding Sites ◽  
Color Change ◽  
Colorimetric Sensor ◽  
Anion Sensor ◽  
Anion Sensing ◽  
Naked Eye ◽  
Colorimetric Chemosensor ◽  
Light Yellow

A colorimetric anion sensor of methyl-3-(2-hydroxy-5-nitrophenyl amino)-3-phenylpropanoate bearing –OH and –NH groups as binding sites and nitrophenyl as a signaling unit, has been successfully accomplished. The compound functioned as a colorimetric chemosensor for H2PO4– and AcO–, in particular, the sensor showed significant naked-eye detectable color change from colorless to light yellow. In contrast, no color change was detected upon addition of other anions such as SO42–, NO3–, and CIO4–. The anion sensing ability of the sensor was further investigated by UV-Vis absorption spectroscopy in acetone. Characteristic UV-Vis spectra changes were revealed upon addition of H2PO4– and AcO–.

TINGKAT KEPARAHAN PERIODONTITIS SERTA PERBANDINGAN JUMLAH KOLONI AGGREGATIBACTER SP DAN PORPHYROMONAS SP PADA PLAK SUBGINGIVA PASIEN GANGGUAN JIWA

2015 ◽  
Vol 18 (3) ◽  
pp. 218-224
Author(s):  
Sunnati ◽  
Ridha Andayani ◽  
Nadia Quamilla ◽  
Syarifah Asmaul Husna
Keyword(s):  
Paper Point ◽  
Banda Aceh

Stres negatif (distres) diduga sebagai salah satu faktor risiko periodontitis. Penelitian ini bertujuan untuk untuk mengetahui tingkat keparahan periodontitis serta perbandingan jumlah koloni Aggregatibacter sp dan Porphyromonas sp pada plak subgingiva pasien gangguan jiwa. Penelitian ini adalah penelitian deskriptif analitik yang dilakukan di Rumah Sakit Jiwa Banda Aceh. Subyek penelitian sebanyak 58 orang untuk pemeriksaan periodontitis dan 24 orang untuk perbandingan jumlah koloni. Pada subyek dilakukan wawancara dan pemeriksaan klinis yaitu pemeriksaan kedalaman poket periodontal dan pemeriksaan OHI-S, juga dilakukan pengambilan sampel plak subgingiva menggunakan paper point steril yang kemudian dibawa ke laboratorium untuk dikultur dan dihitung jumlah koloni bakterinya. Berdasarkan hasil penelitian ini, didapatkan jumlah subyek yang mengalami periodontitis lebih banyak dibandingkan jumlah subyek yang tidak periodontitis dengan distribusi yaitu 20,7%  tidak periodontitis, 70,7%  mengalami periodontitis moderat dan 8,6%  mengalami periodontitis parah. Jumlah koloni Aggregatibacter sp yang dikultur pada media AaGM sebanyak 1,5 x 108 CFU/ml dan jumlah koloni Porphyromonas sp yang dikultur pada media P.Ging Agar sebanyak 7,3 x 107 CFU/ml. Sebagai kesimpulan,  pada penelitian ini jumlah subyek yang mengalami periodontitis lebih banyak dibandingkan jumlah subyek yang tidak periodontitis dan Aggregatibacter sp merupakan bakteri yang paling dominan pada plak subgingiva pasien gangguan jiwa.

Sign in / Sign up

Export Citation Format

Share Document