scholarly journals Peat decomposition – shaping factors, significance in environmental studies and methods of determination; a literature review

Geologos ◽  
2016 ◽  
Vol 22 (1) ◽  
pp. 61-69 ◽  
Author(s):  
Danuta Drzymulska
Keyword(s):  
Chemical Composition ◽  
Literature Review ◽  
Ground Water ◽  
Environmental Conditions ◽  
Meteoric Water ◽  
Climatic Conditions ◽  
Review Of Literature ◽  
Forming Process ◽  
Physical And Chemical

Abstract A review of literature data on the degree of peat decomposition – an important parameter that yields data on environmental conditions during the peat-forming process, i.e., humidity of the mire surface, is presented. A decrease in the rate of peat decomposition indicates a rise of the ground water table. In the case of bogs, which receive exclusively atmospheric (meteoric) water, data on changes in the wetness of past mire surfaces could even be treated as data on past climates. Different factors shaping the process of peat decomposition are also discussed, such as humidity of the substratum and climatic conditions, as well as the chemical composition of peat-forming plants. Methods for the determination of the degree of peat decomposition are also outlined, maintaining the division into field and laboratory analyses. Among the latter are methods based on physical and chemical features of peat and microscopic methods. Comparisons of results obtained by different methods can occasionally be difficult, which may be ascribed to different experience of researchers or the chemically undefined nature of many analyses of humification.

Clay mineralogy in southern Africa river muds

Clay Minerals ◽  
2014 ◽  
Vol 49 (5) ◽  
pp. 717-733 ◽  
Author(s):  
M. Setti ◽  
A. Lόpez-Galindo ◽  
M. Padoan ◽  
E. Garzanti
Keyword(s):  
Chemical Composition ◽  
Southern Africa ◽  
Chemical Weathering ◽  
Volcanic Rocks ◽  
Clay Mineralogy ◽  
Climatic Conditions ◽  
Continental Scale ◽  
Transmission Electron ◽  
Mineral Associations ◽  
Physical And Chemical

AbstractThe composition, morphology and crystal order of clay minerals in silt-sized sediments carried in suspensions from 25 major rivers across tropical southern Africa have been studied by X-ray diffractometry and scanning and transmission electron microscopy. Our goal was to determine the spatial variability of clay-mineral associations in diverse geological settings, and in climatic conditions ranging from humid Angola and Zambia to hyperarid Namibia and the Kalahari. Specific attention was paid to the micromorphology and chemical composition of smectite particles. The relative abundance of smectites, illite/mica, kaolinite and chlorite enabled identification of regions characterized by different physical and chemical processes: (1) negligible chemical weathering is documented in Namibia, where river muds mostly contain illite/mica or smectite derived from Damara metasedimentary or Etendeka volcanic rocks; (2) kaolinite documenting intense weathering, reaches a maximum in the Okavango, Kwando and Upper Zambezi, sourced in subequatorial Angola and Zambia; (3) suspended-load muds in the Limpopo and middle Zambezi catchments display intermediate features, with varied assemblages and smectite compositions reflecting diverse parent lithologies. Clay mineralogy and chemical composition are confirmed as a most effective tool to unravel present and past climatic conditions on a continental scale.

scholarly journals Chemical composition and physic-chemical stability and microbiological cereal bars with almonds native to the Mid-North of Brazil and peel pineapple.

2014 ◽  
Vol 4 (1) ◽  
pp. 11
Author(s):  
Michelle Garcêz Carvalho ◽  
Larissa Morais Ribeiro Silva ◽  
Geraldo Arraes Maia ◽  
Paulo Henrique Machado Sousa ◽  
Evânia Altina Teixeira Figueiredo ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Chemical Stability ◽  
Crude Protein ◽  
Nutritional Values ◽  
Brazilian Legislation ◽  
Fiber Protein ◽  
Pineapple Peel ◽  
Cereal Bars ◽  
Physical And Chemical

<p>Cereal bars are classified as healthy and nutritious foods, being sources of vitamins, minerals, fiber, protein and carbohydrates. Therefore, this study aimed to evaluate the chemical composition and physical and chemical stability and microbiological of cereal bars with almonds chich&aacute;, sapucaia and-nut Gurgu&eacute;ia, supplemented with pineapple peel. The cereal bars were subjected to the determination of its value energy and chemical composition (moisture, carbohydrate, lipid, crude protein, fiber and ash) and evaluate its physical and chemical stability (humidity, water activity and pH) and microbiological (<em>Salmonella</em> sp., Coliforms at 45&deg;C, coagulase positive <em>Staphylococcus</em>, <em>Bacillus cereus</em>, molds and yeasts) during 120 days of storage. The cereal bars had different nutritional values, and the cereal bar with almond chich&aacute; with the highest percentage protein, while the cereal bar with almonds sapucaia had the highest percentage lipid. The cereal bars attended the microbiological standards recommended by the Brazilian legislation, maintaining the physico-chemically and microbiologically stable during the 120 days of storage. Therefore, it is feasible to use the almonds chich&aacute;, sapucaia and-nut Gurgu&eacute;ia as well as peel pineapple in developing cereal bars.</p><p>&nbsp;</p><p><span>DOI: <a href="http://dx.doi.org/10.14685/rebrapa.v4i1.101">http://dx.doi.org/10.14685/rebrapa.v4i1.</a></span><span><a href="http://dx.doi.org/10.14685/rebrapa.v4i1.101">101</a></span></p>

scholarly journals The Productive Capacity and Quality of Several Walnut Cultivars (Juglans regia L.) Grown in North Oltenia, Romania

2019 ◽  
Vol 47 (3) ◽  
Author(s):  
Mihai BOTU ◽  
Yazan F.J. ALABEDALLAT ◽  
Felicia BUCURA ◽  
Elisabeta Irina GEANA ◽  
Marius VLADU
Keyword(s):  
Chemical Composition ◽  
Environmental Conditions ◽  
Oil Content ◽  
Juglans Regia ◽  
Climatic Conditions ◽  
Digital Object Identifier ◽  
Productive Capacity ◽  
Digital Object ◽  
Different Origin

Romania has tradition in walnut culture and favorable climatic conditions. In order to establish the suitable cultivars for growing into the Northern Oltenia area several walnut cultivars of different origin were evaluated for productivity and fruits quality. Twelve Romanian cultivars and two foreign ones with terminal bearing and 10 cultivars with lateral bearing from France and U.S.A. were studied during 18 years of yielding with no irrigation. The group of lateral bearing cultivars proved to be more productive in the environmental conditions of the study area, the highest average yields were recorded for ‘Vina’ (3.64 t ha-1), ‘Hartley’ (3.59 t ha-1), ‘Ferjean’ (3.52 t ha-1), ‘Payne’ (3.45 t ha-1), ‘Pedro’ (3.39 t ha-1), etc. The most productive terminal bearing cultivars were: ‘Jupânești’ (2.88 t ha-1), ‘Valcor’ (2.77 t ha-1), ‘Franquette’ (2.71 t ha-1), ‘Valcris’ (2.62 t ha-1), etc. Although the lateral bearing cultivars emphasized good yields, their extensive culture into the areas with continental type of climatic conditions should be further analysed. The walnut kernel and oil content show that the cultivars are very similar regarding chemical composition when growing under same conditions in Northern Oltenia.   ********* In press - Online First. Article has been peer reviewed, accepted for publication and published online without pagination. It will receive pagination when the issue will be ready for publishing as a complete number (Volume 47, Issue 3, 2019). The article is searchable and citable by Digital Object Identifier (DOI). DOI link will become active after the article will be included in the complete issue. *********

scholarly journals Materials Used for the Production of Upholstered Furniture Like Source of Odors in Interior

2014 ◽  
Vol 62 (1) ◽  
pp. 39-52
Author(s):  
Petr Čech ◽  
Daniela Tesařová
Keyword(s):  
Chemical Composition ◽  
Climatic Conditions ◽  
Small Space ◽  
Voc Emissions ◽  
Olfactory Sensation ◽  
Low Concentrations ◽  
Volatile Organic ◽  
Upholstered Furniture ◽  
Materials Used

This paper investigates the problematic of VOC emissions and their assessment by olfactory methods. The main goal of this contribution is determine the odors emitted by upholstery fabrics used for upholstered furniture. This contribution researches the correlation between the results, which were obtained by the olfactory assessment and the results of the measurements of volatile organic compounds (VOCs) emitted by choose the kind of covering textiles. This research judged the influence of upholstery fabrics with different chemical composition (polyester, cotton and mixture of viscose and cotton) on olfactometric assessment. It was mainly focused on the determination of Hedonic tone and intensity of the odor. These olfactometric characteristics were determined using an equipment Sniffer 9000. Concurrently was also assessed the influence of climatic conditions in small space chamber on olfactometric assessment of tested materials. The climatic conditions differed mainly in terms of temperature and relative humidity in small space chamber. The results are compared with sensory perceptions and the qualitative and quantitative analysis of VOCs performed by using the gas chromatograph Agilent GC 6790 with mass spectrometer detector 5973. The experimental section shows that, the various types of criticized upholstery fabrics with different chemical composition emitted relatively low concentrations of VOC emissions. It was also demonstrated the influence of climatic conditions on VOC emissions and while on their olfactometric assessment. The tested materials of upholstery fabric showed very intensive olfactory sensation, which were described as very unpleasant (−4) in some cases.

STUDY OF CORIANDER SEED OIL (Coriandrum sativum L.)

2010 ◽  
Vol 13 (3) ◽  
pp. 29-38
Author(s):  
Ha Bich Phan ◽  
Thach Ngoc Le
Keyword(s):  
Biological Activity ◽  
Chemical Composition ◽  
Essential Oil ◽  
Seed Oil ◽  
Coriandrum Sativum ◽  
Conventional Heating ◽  
Geranyl Acetate ◽  
Physical And Chemical ◽  
Coriander Seed Oil ◽  
Coriander Seed

Coriandrum sativum L. belongs to the Apiaceae family, which is cultivated in Dong Nai province, in this paper its seed oil of was studied. The essential oil was extracted by hydrodistillation. We used two methods for activating of hydrodistillation: conventional heating and microwave irradiating. Its physical and chemical indexes were measured. The chemical composition of this oil was identified by GC/MS and quantified by GC/FID. Linalool (75.51-77.21 %), and geranyl acetate (15.64-12.79 %) were the main constituents of the oil which were obtained in 0,32-0.39 % yield. The biological activity of this oil was reported.

THE IMPORTANCE OF THE RED BOOK OF SOILS FOR MONITORING AND JUSTIFICATION OF CONSERVATION MEASURES

2020 ◽  
Author(s):  
O.S. Bezuglova ◽  
Keyword(s):  
Chemical Properties ◽  
Natural State ◽  
Soil Maps ◽  
Rostov Region ◽  
Conservation Measures ◽  
Background Data ◽  
The Russian Federation ◽  
Physical And Chemical ◽  
And Chemical Properties

Rostov Region belongs to the highly protected natural territories characterized by the continuous plowing. There territories are the only reserves with the soils preserved in their natural state. However, these areas often lack detailed information about the soils quality and composition. Surveying soils on these territories is crucial for determination of their basic physical and chemical properties. The resulted compilation of soil maps could lay a foundation for creating the Red Book of Soils and the formation of a section in the soil-geographical database of the Russian Federation. Subsequently, such information can be used as a background data for the main types of soils in the region. It will be also valuable during monitoring and justification of conservation measures.

Behavior of Some Varieties in the Kernel Group to the Attack of the Main Pathogens

2018 ◽  
Vol 12 (2) ◽  
pp. 1-7
Author(s):  
Sînziana Venera Morărița
Keyword(s):  
Chemical Composition ◽  
Climatic Conditions ◽  
Complex Chemical ◽  
Complex Chemical Composition ◽  
Large Production ◽  
Special Quality

Abstract Although relatively recent, peach culture has grown great in our country due to the special quality of the fruit, its very complex chemical composition and the large production that can be obtained without much effort. Peach is a species slightly adapted to our climatic conditions, suffers from winter frost, but can provide productive and long productions of 10-15 years.

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