Infrared absorption spectra of plant and animal tissue and of various other substances

Stair, R.; Coblentz, W. W.

doi:10.6028/jres.015.017

Cited by 55 publications

(26 citation statements)

References 5 publications

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“…TPI can exist in two distinct crystalline phases, namely the alpha (a-TPI) and beta (b-TPI) polymorphic forms [11][12][13]. The a-form has a monoclinic cell with two chains, each containing two repeat units.…”

Section: Introductionmentioning

confidence: 99%

Vibrational dynamics of trans-1,4-polyisoprene (β-form)

Pathak

Saxena

Tandon

et al. 2006

Polymer

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Section: Introductionmentioning

confidence: 99%

Vibrational dynamics of trans-1,4-polyisoprene (β-form)

Pathak

Saxena

Tandon

et al. 2006

Polymer

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“…For a detailed discussion of the experimental procedure, reference is made to previous publications [3,4,5,6,7,8]. The spectroradiometer consisted of a mirror spectrometer, with mirrors 50 cm in focal length.…”

Section: Instruments and Methodsmentioning

confidence: 99%

“…The add ition of vanadium (V20 5 ), cobalt (CoO), nickel (NiO), or uranium (U 30 8) oxide in small amounts (see table 1) produc e strong absorption bands in the spectral r egion between 1 and 4/L (see figs. 8, 11 , 12, and 13 ).…”

Section: Other Oxide Glassesmentioning

confidence: 99%

Infrared absorption spectra of some experimental glasses containing rare earth and other oxides

Stair¹,

Faick²

1947

J. RES. NATL. BUR. STAN.

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“…The interpretation of the spectrum in terms of the chemical composition The spectra of plant and animal tissues were first recorded by Stair & Coblentz (1935) and since then numerous attempts have been made to interpret the spectra in terms of chemical groups within the tissues. Tissue sections were studied by Blout & Mellors (1949) and Schwarz, Riggs, Glick, Cameron, Beyer, Jaffe & Trombetta (1951).…”

Section: Examination Of Cell Fractionsmentioning

confidence: 99%

“…is equivalent to 104 wave-numbers or reciprocal centimetres (cm.-'). The wave-number unit (cm.-') is to be preferred because it is directly proportional to the true frequency which can be obtained by multiplying the wave-number of the radiation by the velocity of light c. Stair & Coblentz (1935) were perhaps the first to record the spectra (1-15,u) of biological materials such as onion skins, the membrane of fish bladder, bat's wings, egg albumin, egg membranes, gelatin and pith of feathers. They did not attempt to interpret the spectra but they commented upon their similarity.…”

Section: (With 2 Figures In the Text)mentioning

confidence: 99%

Infra-red spectroscopy and its application to microbiology

Norris¹

1959

J. Hyg.

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Colorimeters and non-recording spectrophotometers for visible and ultra-violet light have been used for many years and are to be found in most microbiological laboratories. With the need for greater speed of operation, recording instruments are now coming into more general use. During the last two decades recording infra-red spectrophotometers have been developed and these have enabled the absorption measurements on micro-organisms to be extended into the infra-red region of the spectrum. Two factors have tended to retard the use of infra-red spectrophotometry. One is the high initial cost of the equipment and the other is the large absorption of infra-red radiation by water. Despite these difficulties, a considerable amount of work has now been done and it seems profitable to review the varied applications to which infra-red spectroscopy has already been put and to indicate the results which have been obtained by its use.Infra-red radiation is part of the electromagnetic spectrum. The lower wavelength limit is set by the long wavelength limit of perception by the human eye and the upper limit is arbitrarily fixed by the lower limit of present microwave techniques. The range of infra-red wavelengths is thus between 075 micron (,u) and 50O,. The measurements so far reported on biological materials have been confined to the region 1-16/t. The infra-red absorption spectra of most materials consist of a large number of absorption bands. These bands are due to the vibrational and rotational motions of the molecules which are excited by the absorption of infra-red radiation. The fundamental frequency of vibration of a particular bond or group of atoms in a molecule involves the motions of all the atoms in the molecule. For large molecules, however, it is found that a certain group of atoms or a chemical bond gives rise to an absorption band at a particular frequency which is almost independent of the remainder of the molecule. A spectrum comprises several of these absorption bands of different strengths and different frequencies, sometimes overlapping, sometimes simple and sometimes complex. No two different molecules, with the exception of optical enantiomorphs, possess the same bonds and groups of atoms and therefore no two different molecules have the same infra-red absorption spectrum. It is for this reason that infra-red spectroscopy is one of the most powerful analytical tools available to the organic chemist.The fundamental frequency of the stretching vibration of a carbon-hydrogen bond is approximately 1014 cyc./sec. The frequencies involved are so high that it is more convenient to characterize radiation by its wavelength or wave-number.The latter unit may be defined as the number of waves per centimetre. Radiation

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Infrared absorption spectra of plant and animal tissue and of various other substances

Cited by 55 publications

References 5 publications

Vibrational dynamics of trans-1,4-polyisoprene (β-form)

Vibrational dynamics of trans-1,4-polyisoprene (β-form)

Infrared absorption spectra of some experimental glasses containing rare earth and other oxides

Infra-red spectroscopy and its application to microbiology

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