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Добірка наукової літератури з теми "Hardwoods Papua New Guinea Chemistry"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 29 січня 2023

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Статті в журналах з теми "Hardwoods Papua New Guinea Chemistry"

1

Worthing, M. A. "Deerite from Papua New Guinea." Mineralogical Magazine 51, no. 363 (December 1987): 689–93. http://dx.doi.org/10.1180/minmag.1987.051.363.09.

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AbstractDeerite in two meta-ironstones from Papua New Guinea coexists with quartz-albite-riebeckite-dannemorite-magnetite-spessartine-stilpnomelane-apatite-Ca/Mn carbonates and quartz-albite-crossite-ilmenite-spessartine-stilpnomelane-apatite respectively. Geochemical comparisons in the system FeO-MnO-MgO suggest that the P.N.G. deerites most closely resemble Franciscan types. However, the metamorphic assemblages more closely resemble Alpine types indicating metamorphism close to the lower P-T limit of deerite stability. Consistent differences in whole-rock and internal oxidation ratios between the two specimens suggest that fo2 may be important in determining deerite chemistry. A redox equation is suggested linking changes in deerite internal oxidation ratio with variable OH content.
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Blong, Russell J. "Natural Hazards in the Papua New Guinea Highlands." Mountain Research and Development 6, no. 3 (August 1986): 233. http://dx.doi.org/10.2307/3673393.

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3

Noro, Jeffery C., John A. Kalaitzis, and Brett A. Neilan. "Bioactive Natural Products from Papua New Guinea Marine Sponges." Chemistry & Biodiversity 9, no. 10 (October 2012): 2077–95. http://dx.doi.org/10.1002/cbdv.201100292.

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4

Carr, Gavin, Mikolaj Raszek, Rob Van Soest, Teatulohi Matainaho, Micheal Shopik, Charles F. B. Holmes, and Raymond J. Andersen. "Protein Phosphatase Inhibitors Isolated fromSpongia irregularisCollected in Papua New Guinea." Journal of Natural Products 70, no. 11 (November 2007): 1812–15. http://dx.doi.org/10.1021/np0702887.

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5

Lu, Zhenyu, Ryan M. Van Wagoner, Cristopher D. Pond, Ann R. Pole, James B. Jensen, D’Arbra Blankenship, Brian T. Grimberg, et al. "Myristicyclins A and B: Antimalarial Procyanidins fromHorsfieldia spicatafrom Papua New Guinea." Organic Letters 16, no. 2 (December 19, 2013): 346–49. http://dx.doi.org/10.1021/ol4022639.

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6

Alenezi, Samya S., Naif D. Alenezi, Godwin U. Ebiloma, Manal J. Natto, Marzuq A. Ungogo, John O. Igoli, Valerie A. Ferro, et al. "The Antiprotozoal Activity of Papua New Guinea Propolis and Its Triterpenes." Molecules 27, no. 5 (March 1, 2022): 1622. http://dx.doi.org/10.3390/molecules27051622.

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Profiling a propolis sample from Papua New Guinea (PNG) using high-resolution mass spectrometry indicated that it contained several triterpenoids. Further fractionation by column chromatography and medium-pressure liquid chromatography (MPLC) followed by nuclear magnetic resonance spectroscopy (NMR) identified 12 triterpenoids. Five of these were obtained pure and the others as mixtures of two or three compounds. The compounds identified were: mangiferonic acid, ambonic acid, isomangiferolic acid, ambolic acid, 27-hydroxyisomangiferolic acid, cycloartenol, cycloeucalenol, 24-methylenecycloartenol, 20-hydroxybetulin, betulin, betulinic acid and madecassic acid. The fractions from the propolis and the purified compounds were tested in vitro against Crithidia fasciculata, Trypanosoma congolense, drug-resistant Trypanosoma congolense, Trypanosoma b. brucei and multidrug-resistant Trypanosoma b. brucei (B48). They were also assayed for their toxicity against U947 cells. The compounds and fractions displayed moderate to high activity against parasitic protozoa but only low cytotoxicity against the mammalian cells. The most active isolated compound, 20-hydroxybetulin, was found to be trypanostatic when different concentrations were tested against T. b. brucei growth.
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7

Purdy, Derek H., David J. Hadley, Jasper O. Kenter, and Jeff Kinch. "Sea Cucumber Moratorium and Livelihood Diversity in Papua New Guinea." Coastal Management 45, no. 2 (February 10, 2017): 161–77. http://dx.doi.org/10.1080/08920753.2017.1278147.

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Richards, J. P., C. J. Bray, D. M. DeR Channer, and E. T. C. Spooner. "Fluid chemistry and processes at the Porgera gold deposit, Papua New Guinea." Mineralium Deposita 32, no. 2 (February 24, 1997): 119–32. http://dx.doi.org/10.1007/s001260050079.

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Gorecki, Pawel P. "Human Occupation and Agricultural Development in the Papua New Guinea Highlands." Mountain Research and Development 6, no. 2 (May 1986): 159. http://dx.doi.org/10.2307/3673269.

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McPhail, Kerry L., and William H. Gerwick. "Three New Malyngamides from a Papua New Guinea Collection of the Marine CyanobacteriumLyngbyamajuscula." Journal of Natural Products 66, no. 1 (January 2003): 132–35. http://dx.doi.org/10.1021/np0204186.

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Дисертації з теми "Hardwoods Papua New Guinea Chemistry"

1

Wegerski, Christopher John. "Chemistry under the sea : secondary metabolites from marine sponges of Papua New Guinea /." Diss., Digital Dissertations Database. Restricted to UC campuses, 2007. http://uclibs.org/PID/11984.

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2

Murom, Banabas. "Study of nitrogen loss pathways in oil palm (Elaeis guineensis Jacq.) growing agro-ecosystems on volcanic ash soils in Papua New Guinea : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Soil Science at Massey University, Palmerston North, New Zealand." 2007. http://hdl.handle.net/10179/1449.

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Oil palm is the largest national crop produced in Papua New Guinea. It is grown on over 80,000 ha of young volcanic soils in five Provinces, employs over 12,000 workers and uses >12,000 tonnes of fertiliser to offset nitrogen deficiency which is the most limiting factor to production. Oil palms strip out 160 - 200 kg N ha-1 yr-1 from the soil. Nitrogen fertilisers account for 60-70 % of all variable production costs but 40-60 % of applied fertiliser cannot be accounted for. Few studies have investigated the amounts of nitrogen lost via leaching, denitrification, volatilisation or as surface runoff in tropical soils and none have been done in Papua New Guinea. Oil palm soils typically have extremely high infiltrabilities (80-8,500 mm hr-1) and receive high annual rainfall which throughfall makes spatially non-uniform. The objective of this study was to assess and quantify nitrogen losses and suggest strategies that might assist in reducing them and their impact on the environment. The modest facilities available at the two research sites, West New Britain (Dami) and Oro (Sangara) Provinces, meant that no analytical work could be done on-site, so simple but appropriate methods were used to evaluate losses, with samples collected, preserved and sent off-shore for analysis. Large four-palm plots were used to evaluate runoff; a gas trap was used to collect evolved nitrous oxide, and lysimeters, suction cups and finally an in situ destructive soil sampling procedure were all used to assess leaching losses and the rate of nitrification of ammonium fertiliser. Results suggest that under the extreme total annual rainfall at Dami (3,500-4,000 mm) and to a lesser extent at Sangara (2,500-3,000 mm), leaching is the dominant loss pathway, with the rate of loss depending, to some extent, on the rate of nitrate formation and the retentivity of the soil for ammonium, but mainly on the rate at which drainage water is generated. A leaching model was developed that indicated that the average residence time of nitrogen fertiliser in the root zone (0-50 cm) varied from 21 days in February, at Dami, to 190 days in May, at Sangara.
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Частини книг з теми "Hardwoods Papua New Guinea Chemistry"

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Drew, Richard A. I., and Meredith C. Romig. "Species and speciation." In The fruit fly fauna (Diptera: Tephritideae: Dacinae) of Papua New Guinea, Indonesian Papua, Associated Islands and Bougainville, 7–8. Wallingford: CABI, 2022. http://dx.doi.org/10.1079/9781789249514.0004.

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Abstract This chapter discusses two species models, which are diametrically opposed. The first, often called the 'biological species concept', defines species in terms of 'reproductive isolation', convinced that species arise when subsets of a population are split off and remain geographically isolated over evolutionary time. If and when such new species are reunited with their founder population, interbreeding does not occur, or if it does, infertile progeny result. Hence, from the biological species concept, natural selection is a primary agent of change and directly selects for new species. In this sense, species are the direct products of natural selection and they are therefore 'adaptive devices'. When applying this species concept, it has been impossible to separate some sibling species of fruit flies in the genus Bactrocera where distinct morphological species can be similar in molecular analyses of certain DNA sequences, while similar species morphologically are distinct in the same molecular characters. A radically different model, the 'recognition concept of species', relies heavily on a knowledge of species ecology and behaviour, particularly in their natural habitat. The principal points in this concept are given. In contrast to the now-outdated biological species concept that leads one to depend on laboratory-based research to define species, the recognition concept requires workers to undertake extensive field research in the habitat of the taxon under investigation. In translating this approach to research in the insect family Tephritidae, particularly the Dacinae, some 35 years of field surveys have been undertaken throughout the Indian subcontinent, South-east Asia and the South Pacific region. These surveys included trapping using male lure traps and host fruit collections of commercial/edible fruits. The results of this work have included the provision of specimens of almost all known species for morphological descriptions (c.800 species), material for male pheromone chemistry, and data on host fruit relationships and biogeographical studies.
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2

Binns, R. A., L. E. Dotter, and K. A. Blacklock. "Chemistry of Borehole Fluids Collected at PACMANUS, Papua New Guinea, ODP Leg 193." In Proceedings of the Ocean Drilling Program, 194 Scientific Results. Ocean Drilling Program, 2004. http://dx.doi.org/10.2973/odp.proc.sr.193.210.2004.

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