Uses of the Concentrated Filament Tungsten Lamp in the Laboratory

AbstractBacterio-rhodopsin purple membrane (PM) thin films have been prepared by selfassembling (SA) technique. Morphological properties of the layers were inspected by Scanning Electron Microscopy (SEM) and Scanning Force Microscopy (SFM) highlighting the presence of densely packed PM films. Reflectance Uv-vis spectra on these films revealed the typical bR absorption at 570 nm. By using a tungsten lamp illuminations (250-350 mW) chopped at 0.5Hz, photoelectric responses were detected. Differential (light-on and light-off) photocurrent signals of up to 1 μA/cm2 were obtained upon light exposure.

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Direct formation of 3,3,6,6-Tetraaryl-1,2-dioxans from 1,1-Diarylethylenes and oxygen, catalysed by antimony(V) chloride

Australian Journal of Chemistry ◽

10.1071/ch9781737 ◽

1978 ◽

Vol 31 (8) ◽

pp. 1737 ◽

Cited By ~ 31

Author(s):

RK Haynes ◽

MKS Probert ◽

ID Wilmot

Keyword(s):

Direct Formation ◽

High Yields ◽

Tungsten Lamp

1,1-Diphenylethylene, 1,1-di-p-tolylethylene, 1,1-di-p-anisylethylene and 1,1-di(p-t-butylphenyl)-ethylene are converted in high yields (80- 90%) into the corresponding 3,3,6,6-tetraaryl-1,2-dioxans in the presence of oxygen and catalytic amounts of antimony(v) chloride in dichloromethane at -40° to -78° under irradiation from a tungsten lamp.

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FINGER PRINTING ANALYSIS OF THE PHENOLS FROM HOLOPTELEA INTEGRIFOLIA (ROXB.) PLANT LEAVES USING HPTLC

INDIAN DRUGS ◽

10.53879/id.54.09.10727 ◽

2017 ◽

Vol 54 (09) ◽

pp. 67-71

Author(s):

R. C. Sutar ◽

◽

D. S Musmade

Keyword(s):

High Performance ◽

Methanolic Extract ◽

Phytochemical Analysis ◽

Phytochemical Screening ◽

Plant Leaves ◽

Methanol Extracts ◽

Finger Printing ◽

Rf Values ◽

Layer Chromatography ◽

Tungsten Lamp

The present study was conducted to identify the phenols from methanol extracts (MHI) of medicinally and economically useful leaves of Holoptelea integrifolia (Roxb.) plant using High Performance Thin Layer Chromatography (HPLC) technique. Preliminary phytochemical screening was done and HPTLC studies were carried out on CAMAG HPTLC system equipped with Linomat V applicator (Switzerland). Densitometric scanning was performed with Camag TLC scanner IV in the reflectance absorbance mode at 540 nm and operated by Win CATS software (1.4.6 Camag) with the help of tungsten lamp. Preliminary phytochemical screening of methanolic extract of Holoptelea integrifolia showed the presence of steroids, alkaloids, flavonoids, proteins, phenols and carbohydrates. HPT LC finger printing of phenols of methanolic extract of leaf revealed seven polyvalent phytoconstituents (7 peaks) and corresponding ascending order of Rf values in the range of 0.15 to 0.75. From the results of preliminary phytochemical analysis and above Rf values, we have concluded the presence of phenols in methanol extracts.

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Intercalibration of different light-traps and bulbs used in moth monitoring in northern Europe

Entomologica Fennica ◽

10.33338/ef.83965 ◽

1998 ◽

Vol 9 (1) ◽

pp. 37-51 ◽

Cited By ~ 17

Author(s):

Reima Leinonen ◽

Guy Söderman ◽

Juhani Itämies ◽

Seppo Rytkönen ◽

Ilpo Rutanen

Keyword(s):

The Other ◽

Northern Europe ◽

Mercury Vapour ◽

Light Traps ◽

Mercury Vapour Lamp ◽

Species Being ◽

Tungsten Lamp

Four different combinations of light-traps and bulbs were tested during the summer 1996 in Kainuu, northern Finland: a Jalas model with a 160-W (J/160W) blended light lamp or a 125-W (J/125W) mercury vapour lamp, a Ryrholm trap with a 125-W (R/125W) mercury vapour lamp and a Rothamsted trap with a 200-W tungsten lamp (G/200W). The traps were rotated between four sites every night, but were kept in the same position for the fifth night in order to prevent the possible influence of moonlight. The longest distance between the traps was 150m, and there was no direct visibility between any of them. Three orders were inspected, i.e. Lepidoptera, Coleoptera and Hemiptera, the total numbers of individuals and species being as follows: 20857/425, 862/101 and 1868/58. G/200W collected significantly fewer moths than the other traps. In some cases, J/125W collected significantly more moths and less species than the J/160W design. The R/125W design collected significantly more species than the J/160W design. Similar differences in the effectiveness of the lamps and traps were found in the case of Coleoptera and Hemiptera. Alpha diversities showed the same trend.

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The Relation between Efficiency and Life of the Tungsten Lamp

JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN ◽

10.2150/jieij1917.10.5_217 ◽

1926 ◽

Vol 10 (5) ◽

pp. 217-225

Author(s):

M. Igari

Keyword(s):

Tungsten Lamp

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Quantitative Thin Layer Chromatographic Determination of Furazolidone and Nitrofurazone in Animal Feeds

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/61.1.92 ◽

1978 ◽

Vol 61 (1) ◽

pp. 92-95

Author(s):

Ugo R Cieri

Keyword(s):

Thin Layer ◽

Ultraviolet Light ◽

Internal Standard ◽

Chromatographic Determination ◽

Animal Feeds ◽

Recording Spectrophotometer ◽

Tungsten Lamp

Abstract A method is presented for determining the nitrofurans furazolidone and nitrofurazone in animal feeds. The sample is extracted with acetone, and aliquots of the concentrated extract are spotted on thin layer chromatographic fluorescent plates. After development in CHCl3-methanol (90+10), the bands containing the nitrofurans are detected under shortwave ultraviolet light, scraped from the plate, and extracted with ethanol. The centrifuged extracts are scanned from 500 to 300 nm on a recording spectrophotometer with a tungsten lamp, and the absorbance maxima near 360 nm are used for quantitation. To compensate for extraction and chromatographic losses and for other interferences, the nitrofuran not present in the sample is added as an internal standard. The method is generally not applicable at a level below 0.005% since detection of the bands becomes difficult.

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