Analysis of resins using the relative optical density of characteristic frequencies in pyrolyzate IR spectra

1976 ◽  
Vol 24 (1) ◽  
pp. 65-68 ◽  
Author(s):  
A. I. Malyshev ◽  
I. K. Shmyrev ◽  
I. P. Kotova
Keyword(s):  
Ir Spectra ◽  
Optical Density ◽  
Relative Optical Density ◽  
Characteristic Frequencies

Numerical simulation aided relative optical density analysis of TEM images for soot morphology determination

2007 ◽  
Vol 31 (1) ◽  
pp. 861-868 ◽  
Author(s):  
Kuo Tian ◽  
Fengshan Liu ◽  
Min Yang ◽  
Kevin A. Thomson ◽  
David R. Snelling ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Optical Density ◽  
Relative Optical Density ◽  
Soot Morphology ◽  
Density Analysis

scholarly journals A reducing-difference IR-spectral study of 4-aminopyridine

2004 ◽  
Vol 2 (4) ◽  
pp. 589-597 ◽  
Author(s):  
Michail Arnaudov ◽  
Bojidarka Ivanova ◽  
Shishman Dinkov
Keyword(s):  
Solid State ◽  
Ir Spectra ◽  
Spectral Study ◽  
Fermi Resonance ◽  
Characteristic Frequencies ◽  
Band Assignment

AbstractThe IR-spectra of 4-aminopyridine (4-AP) in solution and in the solid state have been analyzed, using the reducing-difference procedure. Defining a more precise band assignment of a part of the characteristic frequencies of 4-AP, the data obtained proved in particular a Fermi-resonance splitting of the symmetric NH2-stretch.

scholarly journals Long-term antibacterial performances of biodegradable polylactic acid materials with direct absorption of antibiotic agents

RSC Advances ◽  
2018 ◽  
Vol 8 (29) ◽  
pp. 16223-16231 ◽  
Author(s):  
Chien-Hao Chen ◽  
Yuan-Yuan Yao ◽  
Hao-Che Tang ◽  
Tung-Yi Lin ◽  
Dave W. Chen ◽  
...  
Keyword(s):  
Surface Modification ◽  
3D Printing ◽  
Polylactic Acid ◽  
Optical Density ◽  
Relative Optical Density ◽  
Direct Absorption ◽  
Antibiotic Agents

In this study, we developed a surface modification of 3D printing PLA disks. The relative optical density of the S. aureus in the solution can reduce to 40% using the PLA disk directly absorbed with suitable antibiotic agents.

scholarly journals Determination of the morphology of soot aggregates using the relative optical density method for the analysis of TEM images

2006 ◽  
Vol 144 (4) ◽  
pp. 782-791 ◽  
Author(s):  
Kuo Tian ◽  
Kevin A. Thomson ◽  
Fengshan Liu ◽  
David R. Snelling ◽  
Gregory J. Smallwood ◽  
...  
Keyword(s):  
Optical Density ◽  
Relative Optical Density ◽  
Density Method

Subsurface modification and relative optical density of synthetic diamond

1997 ◽  
Vol 119 (3-4) ◽  
pp. 181-184 ◽  
Author(s):  
Zhongquan Ma ◽  
Yufeng Zheng ◽  
H. Naramoto
Keyword(s):  
Optical Density ◽  
Synthetic Diamond ◽  
Relative Optical Density

scholarly journals Correlation between calcium, water contents and ultrasonographic appearance of atherosclerotic lesions of carotid artery lesions

2020 ◽  
Vol 11 (1) ◽  
pp. 269-276
Author(s):  
Béla Fülesdi ◽  
Szabolcs Farkas ◽  
Zoltán Gyöngyösi ◽  
Péter Siró ◽  
Dániel Bereczki ◽  
...  
Keyword(s):  
Water Content ◽  
Optical Density ◽  
Calcium Content ◽  
Relative Optical Density ◽  
Carotid Plaques ◽  
Atherosclerotic Lesions ◽  
Carotid Artery Lesions ◽  
Wet Weight ◽  
Water Contents ◽  
Ultrasonographic Appearance

AbstractBackgroundWe tested the hypothesis whether there is a correlation between the echogenicity and calcium and water contents of carotid plaques.Patients and methodsNinety carotid befurcations from 45 deceased patients were removed during autopsy. Thirty-four plaques were categorized as homogenous echolucent (HEL), homogenous echogenic (HEG) and heterogenous (HE) plaques based on premortem B-mode image. Water content was expressed in % of wet weight. Ca was determined by proton-induced X-ray emission and expressed in ppm. Relative optical density of the B-mode images was analyzed offline using a computer program.ResultsHEL plaques had lower Ca content (medians and IQRs: 6,145 [4,465–6,536 ppm]) compared to HEG (74,100 [15,300–1,44,500−ppm]), P ≤ 0.001). HE plaques showed an intermediate calcium content (7,310 [4,840–9,920 ppm]) that was statistically not different from echolucent plaques. Water content of HEG plaques was statistically not different from HEL and HE (HEG:53.5 [35.5–64%], HEL: 73.5 [69.7–78.5%], HE: 70.6 [67.4–73.9%]). HEG plaques had the highest relative optical densities (196 [188–217%]). HEL and HE had similar relative optical densities (HEL: 176 [164–187%], HE: 164 [144–188%], respectively). A significant positive correlation was found between the Ca content and relative optical density of plaques.ConclusionsEchogenicity of carotid plaques increases along with their calcium content. Water content may be an important factor in differentiation of different plaques.

scholarly journals Clonal Variability among Grower Bulb Lots of Easter Lily ‘Nellie White’

2007 ◽  
Vol 132 (1) ◽  
pp. 29-43 ◽  
Author(s):  
David C. Zlesak ◽  
Neil O. Anderson
Keyword(s):  
Optical Density ◽  
Phenotypic Variability ◽  
Morphological Variability ◽  
The United States ◽  
Leaf Length ◽  
Analysis Of Covariance ◽  
Strain Selection ◽  
Relative Optical Density ◽  
Lily Symptomless Virus ◽  
Easter Lily

Potted Easter lily (Lilium longiflorum Thunb.) ranks among the top five potted flowering plants in the United States in economic value. One clone (‘Nellie White’) dominates the North American market. It is grown by less than 10 bulb producers, each maintaining their own propagation stock and practicing intraclonal strain selection. Greenhouse forcers attest to forcing differences depending on the bulb grower. The objective of this study was to determine the extent and sources of morphological variability among bulb growers. Bulb lots were obtained in 2002 (S1) and 2003 (S2) (n = 11 and n = 12 lots respectively) with 12 or 15 bulbs/lot. Grower's identification was confidential but kept consistent across shipment years. Bulbs were obtained as the 20.3 to 22.9-cm circumference commercial class, and S1 and S2 shipments were control temperature forced over two forcing cycles (FC1, FC2). Data collection included initial bulb weight and circumference; days to stem emergence (SEM), visible flower bud (VFB), and anthesis (AN); plant and inflorescence height; number of stems, leaves, flowers, and ovules per first flower/stem reaching AN; percentage of ovules forming viable seeds; leaf length and width; major lily viruses (presence/absence, relative optical density); leaf length-to-width ratios; AN-SEM, AN-VFB, and VFB-SEM. Significant differences were found among bulb lots for every trait except AN-VFB. Variability among bulb lots can be attributed to variation in initial bulb size, previous forcing cycle environment, variable lily symptomless virus (LSV) titer, and underlying genetic/epigenetic differences. Bulb circumference had the highest standardized canonical coefficient for canonical variable one in S2-FC1 and was a significant covariate in analysis of covariance; larger bulbs tended to produce larger plants. Forcing over two cycles allowed for less phenotypic variability among bulb lots in FC2 because of a common FC1 environment. All lilies were positive for LSV and negative for four other viruses tested. Significant negative correlations in S2 between relative optical density and plant height (FC1), initial bulb weight (FC2), and initial bulb circumference (FC2) indicate an effect of relative LSV titer on plant morphology. The role of LSV titer and genetic/epigenetic intergrower variability in ‘Nellie White’ warrants further investigation. Likewise, a lack of breeder/producer companies and the corollary independent grower strain selection has significant genetic consequences and complicates identification of superior ‘Nellie White’ clones.

Infrared Studies of DDT, Structurally Related Halogenated Pesticides, and Some Metabolites

1972 ◽  
Vol 55 (1) ◽  
pp. 15-31
Author(s):  
Jo-Yun T Chen ◽  
Roland W Dority
Keyword(s):  
Ir Spectra ◽  
Pesticide Residue ◽  
Characteristic Frequencies ◽  
Mass Effects ◽  
Infrared Studies ◽  
The Stability ◽  
Correlation Tables

Abstract Reference IR spectra of 29 purified halogenated pesticides are presented. The spectra were recorded with micro quantities of the purified pesticide compounds to facilitate identification of pesticide residue isolates. The compounds included DDT and related structures. The observed characteristic frequencies are tabulated in correlation tables, and their significance is interpreted in terms of the substituents and of the electromesomeric and mass effects of the substituents. The relevance of these effects to the stability and persistence of this class of pesticides is noted.

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