scholarly journals Quantitative analysis of nitrate and nitrite contents in vegetables commonly consumed in Delta State, Nigeria

2006 ◽  
Vol 96 (5) ◽  
pp. 902-905 ◽  
Author(s):  
I. Onyesom ◽  
P. N. Okoh
Keyword(s):  
Quantitative Analysis ◽  
Stomach Contents ◽  
Dry Weight ◽  
The State ◽  
Secondary Amines ◽  
Vernonia Amygdalina ◽  
Nitrite Toxicity ◽  
Frequent Consumption ◽  
Nitrate And Nitrite ◽  
Talinum Triangulare

Plasma thiocyanate has been reported to be high among cassava-eating populations such as that in Nigeria because of the cyanide content of cassava. Thiocyanate, which is secreted into the stomach contents of animals, has been demonstrated to catalyse the formation of nitrosamines (potent carcinogens) in the stomach from secondary amines and nitrite. The main source of the nitrite precursor in this environment is vegetables, primarily eaten as the chief supplier of proteins. The present study attempts to analyse the levels of nitrate and nitrite in vegetables commonly grown and consumed in Delta State, Nigeria. The nitrate and nitrite contents in green vegetable (Amaranthus spp.), bitter leaf (Vernonia amygdalina), pumpkin (Telfaria occidentalis) and water leaf (Talinum triangulare) grown in different localities of the state were determined by standard analytical procedures. The results show that those vegetables grown in the industrialised urban centres of the state had higher nitrate (223 (sd 71) mg/kg dry weight; P<0·05) and nitrite (12·6 (sd 1·7) mg/kg dry weight; P>0·05) levels when compared with the same species (188 (sd 77) mg nitrate/kg dry weight and 10·9 (sd 1·1) mg nitrite/kg dry weight) cultivated in less industrialised suburbs. We conclude that frequent consumption of such vegetables whose nitrate and nitrite contents are high by cassava-eating individuals might put them at risk of developing stomach cancer and other possible results of nitrate and/or nitrite toxicity. In order to avoid an outbreak in our communities, appropriate agencies should monitor and regulate the release of chemicals into the environment. In the meantime, the cultivation and consumption of vegetables grown in industrialised areas of the state should be discouraged.

scholarly journals Stomach content analysis of a Dugong (Dugong dugon) from South Sulawesi, Indonesia

1993 ◽  
Vol 44 (1) ◽  
pp. 229 ◽  
Author(s):  
PLA Erftemeijer ◽  
Djunarli ◽  
W Moka
Keyword(s):  
Quantitative Analysis ◽  
Coastal Waters ◽  
Stomach Contents ◽  
Dry Weight ◽  
Stomach Content Analysis ◽  
Total Biomass ◽  
Feeding Selectivity ◽  
Individual Female ◽  
South Sulawesi ◽  
Total Dry Weight

A quantitative analysis of the stomach contents of an individual female dugong (Dugong dugon) caught by fishermen in February 1991 in the coastal waters of South Sulawesi, Indonesia, is presented. Of the total dry weight of digesta (about 3.4 kg), 98.9% consisted of seagrass material. Rhizome and root material of smaller pioneering genera (i.e. Halophila, Halodule, Cymodocea) accounted for 71.5% of the total dry weight. Enhalus acoroides dominated among leaf material (about 50%), but its contribution to the total biomass of the stomach contents was only 13.5%. Rhizome material of Enhalus and Thalassia was absent. The amount of sediment in the stomach was negligible. The results are compared with those from similar studies, and the implications for possible feeding selectivity are discussed.

On the State of Genre/Form Vocabulary: A Quantitative Analysis of LCGFT Data in WorldCat

2021 ◽  
Vol 65 (2) ◽  
pp. 52
Author(s):  
Colin Bitter ◽  
Yuji Tosaka
Keyword(s):  
Quantitative Analysis ◽  
Detailed Analysis ◽  
The State ◽  
Bibliographic Databases ◽  
Moderate Increase ◽  
Large Set ◽  
Library Of Congress ◽  
Bibliographic Data ◽  
Innovative Solutions ◽  
Over Time

The purpose of this paper is to report on a quantitative analysis of the LCGFT vocabulary within a large set of MARC bibliographic data retrieved from the OCLC WorldCat database. The study aimed to provide a detailed analysis of the outcomes of the LCGFT project, which was launched by the Library of Congress (LC) in 2007. Findings point to a moderate increase in LCGFT use over time; however, the vocabulary has not been applied to the fullest extent possible in WorldCat. Further, adoption has been inconsistent between the various LCGFT disciplines. These and other findings discussed here suggest that retrospective application of the vocabulary using automated means should be investigated by catalogers and other technical services librarians. Indeed, as the data used for the analysis show somewhat uneven application of LCGFT, and with nearly half a billion records in WorldCat, it remains a certainty that much of LCGFT’s full potentials for genre/form access and retrieval will remain untapped until innovative solutions are introduced to further increase overall vocabulary usage in bibliographic databases.

scholarly journals The Application of a Cadmium Reducer and a Diazotisation Reaction for the Determination of Nitrate and Nitrite in Tobacco / Über die Anwendung des Cadmium-Reduktors und der Diazotierung zur Bestimmung von Nitrat und Nitrit im Tabak

1965 ◽  
Vol 3 (2) ◽  
Author(s):  
U. Dölberg
Keyword(s):  
Quantitative Analysis ◽  
Reduction Method ◽  
Limit Of Detection ◽  
Nitrate And Nitrite ◽  
Inferior Limit

AbstractNitrate is reduced by means of a cadmium reducer and spectrophotometrically determined in the form of nitrite by a diazotisation reaction. The results obtained by application of the described method to tobacco extracts correspond well to those resulting from the earlier described dimethylphenol procedure. Owing to its better sensitivity and specifity the reduction method is particularly suitable for the quantitative analysis of smallest amounts of nitrate. Quantities of 0.03 % of nitrate can be determined without difficulties. The inferior limit of detection is 0.001 %.

scholarly journals Total Hyptolide of Indonesian Hyptis pectinata extracts in a various solvent using HPLC and UV-Vis spectroscopy and their toxicities

2019 ◽  
Vol 22 (6) ◽  
pp. 305-309
Author(s):  
Meiny Suzery ◽  
Siti Khumairoh ◽  
Bambang Cahyono
Keyword(s):  
Quantitative Analysis ◽  
Toxicity Test ◽  
Brine Shrimp ◽  
Uv Spectroscopy ◽  
Bioactive Compound ◽  
Dry Weight ◽  
Pure Compound ◽  
Standard Curve ◽  
Lc50 Value ◽  
Vis Spectroscopy

The bioactive compound of hyptolide has been isolated from an Indonesian plant Hyptis pectinata using various solvents. The pure compound was then used as a standard in quantitative analysis using HPLC and UV-Vis spectroscopy in ethanol (EEth), ethyl acetate (EEa), acetone (Eac) and hexane (Ehex) extract each earned 3.14%, 0.01%, 1.33% and 0.04% (dry weight per sample). The standard curve of hyptolide using UV spectroscopy has been obtained with the coefficient of relationship (r) of 0.997. However, the use of spectroscopy was not recommended for the standardization of hyptolide in the extract due to interference from other compounds that absorb the same wavelength. Furthermore, the toxicity test using the Brine Shrimp lethality test shows LC50 value of 92-181 ppm, which was in EEa compared to EEth, Eac, and Ehex.

scholarly journals Bending Fatigue Behaviors Analysis and Fatigue Life Prediction of 20Cr2Ni4 Gear Steel with Different Stress Concentrations near Non-metallic Inclusions

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3443 ◽  
Author(s):  
Zhiguo Xing ◽  
Zhiyuan Wang ◽  
Haidou Wang ◽  
Debin Shan
Keyword(s):  
Fatigue Life ◽  
Quantitative Analysis ◽  
Steel Production ◽  
The State ◽  
Heavy Duty ◽  
Stress Concentrations ◽  
Bending Fatigue ◽  
Gear Steel ◽  
Gear Steels ◽  
The Relationship

To investigate the relationship between inclusions and bending fatigue behaviors in 20Cr2Ni4 steel under different stress concentrations. This paper designs a new experimental method to prefabricate different size stress concentrations near the inclusions, and then conducts a new type of bending fatigue test to study the inclusions and their surrounding stress distributions in 20Cr2Ni4 steel. A microhardness tester was combined with laser etching equipment to realize the prefabrication of different stress concentrations at arbitrary positions around any inclusion on the gear steel surface. This method provides an experimental basis for the quantitative analysis of the relationship between stress distribution and fatigue life around the inclusions of heavy-duty gear steels. We also predict the bending fatigue lives of heavy-duty gear steels with different types of inclusions, stress states, and spatial distributions. Then, based on the prefabricated notch parameters and the state of inclusions in the steel, a mathematical model of quantitative analysis is proposed, which can accurately predict the fatigue limit of heavy-duty gear steel. The research results can be applied to the actual use of heavy-duty gears and to the accurate life estimation based on the state of gear stress, thereby providing a quantitative reference model for subsequent gear steel production and gear part processing.

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