<i>Absorption Spectra in the Ultraviolet and Visible Region</i>

Lang, Liying; Szőke, János; Varsányi, G.; Vizesy, M.; Chako, Nicholas Q.

doi:10.1063/1.3058229

Cited by 32 publications

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“…T1 and T2 also showed same kind of peak at 278 nm and 275 nm respectively. The UV spectrum of control MTA was well supported by literature data [32]. It suggests that biofield treatment could not make any alteration in chemical structure or arrangement of functional groups of treated MTA samples.…”

Section: Uv-vis Spectroscopic Analysissupporting

confidence: 69%

Physical, Thermal and Spectroscopic Characterization of m-Toluic Acid: an Impact of Biofield Treatment

Trivedi¹

2015

Biochem Pharmacol (Los Angel)

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Abstractm-toluic acid (MTA) is widely used in manufacturing of dyes, pharmaceuticals, polymer stabilizers, and insect repellents. The aim of present study was to evaluate the impact of biofield treatment on physical, thermal and spectroscopic properties of MTA. MTA sample was divided into two groups that served as treated and control. The treated group received Mr. Trivedi's biofield treatment. Subsequently, the control and treated samples were evaluated using X-ray diffraction (XRD), surface area analyser, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), Fourier transform infrared (FT-IR) and ultraviolet-visible (UV-Vis) spectroscopy. XRD result showed a decrease in crystallite size in treated samples i.e. 42.86% in MTA along with the increase in peak intensity as compared to control. However, surface area analysis showed an increase in surface area of 107.14% in treated MTA sample as compared to control. Furthermore, DSC analysis results showed that the latent heat of fusion was considerably reduced by 40.32%, whereas, the melting temperature was increased (2.23%) in treated MTA sample as compared to control. The melting point of treated MTA was found to be 116.04°C as compared to control (113.51°C) sample. Moreover, TGA/DTG studies showed that the control sample lost 56.25% of its weight, whereas, in treated MTA, it was found 58.60%. Also, T max (temperature, at which sample lost maximum of its weight) was decreased by 1.97% in treated MTA sample as compared to control. It indicates that the vaporisation temperature of treated MTA sample might decrease as compared to control. The FT-IR and UV-Vis spectra did not show any significant change in spectral properties of treated MTA sample as compared to control. These findings suggest that biofield treatment has significantly altered the physical and thermal properties of m-toluic acid, which could make them more useful as a chemical intermediate.

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Section: Uv-vis Spectroscopic Analysissupporting

confidence: 69%

Physical, Thermal and Spectroscopic Characterization of m-Toluic Acid: an Impact of Biofield Treatment

Trivedi¹

2015

Biochem Pharmacol (Los Angel)

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“…The electronic transitions are quantized and depend on the electronic structure of the molecules [9].…”

Section: Resultsmentioning

confidence: 99%

Effect of Furfuraldehyde on the Polymerization of Acrylonitrile Initiated by Benzoyl Peroxide

Singh¹,

Dhakarey²

2017

JPP

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“…The third reference [8] reports that at a concentration of 16 3 10 25 M, 2-nitrophenol had a Spekker reading of 0.194. We then explain that this was a precursor to the spectrophotometer that 21 ) and the wavelength of maximum absorbance (nm) for 2-nitrophenol. Experimental data obtained from pairs of students (n ¼ 36) were used for this figure. used color filters and a null meter to match the current from sample and reference photomultipliers [9].…”

Section: Weekmentioning

confidence: 99%

“…Students are given this information to recognize the range in published molar absorptivity values and encouraged to discuss why their values for 2-NP seem markedly different from that in the literature. Student volunteers also reported the finding of a technical report from the Great Lakes Fisheries Commission on the detection and measurement of organic lampricide residues [20] that reports a molar absorptivity for 2-NP of 5,280 M 21 cm 21 at 415 nm in 0.01 M NaOH and cites Lang (1962) [21]. This technical report is available to all students as an online PDF file.…”

Section: Weekmentioning

confidence: 99%

“…This technical report is available to all students as an online PDF file. A student is asked to check the reference of Lang (1962) [21] to make certain whether it actually contains reliable information about the molar absorptivity of 2-NP. This reference is available in our library, but it is in the form of a three-ring binder and is not available for checking out.…”

Section: Weekmentioning

confidence: 99%

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Use of a laboratory exercise on molar absorptivity to help students understand the authority of the primary literature

Soundararajan¹,

Bailey²,

Markwell³

2008

Biochem Molecular Bio Educ

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To promote understanding of the authority of the primary literature in students taking our biochemistry laboratory courses, a biochemistry laboratory exercise on the determination of an acceptable molar absorptivity value of 2-nitrophenol (2-NP) was developed. This made the laboratory course much more relevant by linking to a thematic thread, b-galactosidase, that scaffolds concepts in one exercise with those in later exercises. The substrate for the continuous assay of b-galactosidase is the chromogenic 2-nitrophenyl-b-D-galactopyranoside that produces 2-NP. In an early laboratory exercise, students determine the wavelength of maximum absorption for the protonated and deprotonated form of 2-NP at various pH values and then determine the molar absorptivity of 2-NP. Students were encouraged to discuss apparent discrepancies not only in their own determinations of molar absorptivity values for 2-NP, but also in the published molar absorptivity values for 2-NP (2,150-21,300 M 21 cm 21 ) at almost the same pH and at 420 nm. Finally, the students were led to a publication that serves as an authentic source for molar absorptivity of 2-NP.Keywords: Molar absorptivity, 2-nitrophenol, pH, primary literature.College teachers often discuss their students' general perception that the written word carries unquestionable authority [1]. Indeed, Chaucer illustrated the struggle resulting from the perception of the authority of the written word in his work ''The Wife of Bath's Prologue and Tale'' [2]. For centuries, books were the dominant form of popular written authority. Internet, at present, is perhaps the richest source for information and misinformation. Recent debates about the value of Wikipedia as a source of accurate information is a case in point. For example, the History Department at Middlebury College prohibits students' use of Wikipedia as a source appropriate for research work [3]. A major task of higher education consists of developing the attitudes and skills needed for critically evaluating written words as sources of reliable information for scholarship. Most first-year college writing courses attempt to teach students about the difference between the types of written texts. Encyclopedias offer valuable introductions to topics and bibliographic resources for further study, but are generally not permitted as references for the research works. General Internet searches of particular topics also uncover websites, which can be used for a general orientation to a topic, but such general sites function much like encyclopedias, providing general introductory information, but without the authority of a publishing house.One of the first things that college librarians show their students is academic search engines. Introduction to these academic search engines leads to the further distinction between peer-reviewed and nonpeer-reviewed literature. Students are taught the meaning of peer review and trained to use mainly peer-reviewed articles for their research works. The laboratory recitation and corresponding exercise ...

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Absorption Spectra in the Ultraviolet and Visible Region

Cited by 32 publications

References 0 publications

Physical, Thermal and Spectroscopic Characterization of m-Toluic Acid: an Impact of Biofield Treatment

Physical, Thermal and Spectroscopic Characterization of m-Toluic Acid: an Impact of Biofield Treatment

Effect of Furfuraldehyde on the Polymerization of Acrylonitrile Initiated by Benzoyl Peroxide

Use of a laboratory exercise on molar absorptivity to help students understand the authority of the primary literature

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