scholarly journals The Reflection of Visible Radiation from Leaves of Some Western Australian Species

1966 ◽  
Vol 19 (1) ◽  
pp. 97 ◽  
Author(s):  
GI Pearman
Keyword(s):  
Visible Light ◽  
Plant Species ◽  
Integrating Sphere ◽  
Visible Radiation ◽  
Australian Species ◽  
Australian Plant ◽  
Western Australian ◽  
Reflectance Measurements

A spectrophotometer with an integrating sphere-reflectance attachment was used to determine total reflectances of leaves after irradiation with visible light of wavelengths ranging from 340 to 620 m/,-, Reflectance measurements were made at 20-m/,- intervals in this range. The leaves of 32 Western Australian plant species were studied, and where upper and lower surfaces were different these were con� sidered separately. No significant differences were found between the reflectanceR of leaves from different topographic areas.

scholarly journals Bismuth Oxyhalides for NOx Degradation under Visible Light: The Role of the Chloride Precursor

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 81
Author(s):  
Francesca Tessore ◽  
Federico Galli ◽  
Dalma Schieppati ◽  
Daria C. Boffito ◽  
Alessandro Di Michele ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Photogenerated Electron ◽  
Green Technology ◽  
Bandgap Energy ◽  
Visible Radiation ◽  
Bismuth Nanoparticles ◽  
Metallic Bismuth ◽  
Bismuth Oxyhalides ◽  
The Impact

Photocatalysis is a green technology for tackling water and air contamination. A valid alternative to the most exploited photocatalytic material, TiO2, is bismuth oxyhalides, which feature a wider bandgap energy range and use visible radiation to attain photoexcitation. Moreover, their layered structure favors the separation of photogenerated electron–hole pairs, with an enhancement in photocatalytic activity. Controlled doping of bismuth oxyhalides with metallic bismuth nanoparticles allows for further boosting of the performance of the material. In the present work, we synthesized Y%Bi-doped BiO(Cl0.875Br0.125) (Y = 0.85, 1, 2, 10) photocatalysts, using cetyltrimethylammonium bromide as the bromide source and varying the chloride source to assess the impact that both length and branching of the hydrocarbon chain might have on the framing and layering of the material. A change in the amount of the reducing agent NaBH4 allowed tuning of the percentage of metallic bismuth. After a thorough characterization (XRPD, SEM, TEM, UV-DRS, XPS), the photocatalytic activity of the catalysts was tested in the degradation of NOx under visible light, reaching a remarkable 53% conversion after 3 h of illumination for the material prepared using cetylpyridinium chloride.

Nodulation and performance of exotic and native legumes in Australian soils

2003 ◽  
Vol 51 (5) ◽  
pp. 543 ◽  
Author(s):  
María A. Pérez-Fernández ◽  
Byron B. Lamont
Keyword(s):  
Native Species ◽  
Treated Soil ◽  
Retama Sphaerocarpa ◽  
Australian Species ◽  
And Performance ◽  
Natural Stands ◽  
High Degree ◽  
Western Australian ◽  
Cytisus Balansae ◽  
New Habitats

Six Spanish legumes, Cytisus balansae, C. multiflorus, C. scoparius, C. striatus, Genista hystrix and Retama sphaerocarpa, were able to form effective nodules when grown in six south-western Australian soils. Soils and nodules were collected from beneath natural stands of six native Australian legumes, Jacksonia floribunda, Gompholobium tomentosum, Bossiaea aquifolium, Daviesia horrida, Gastrolobium spinosum and Templetonia retusa. Four combinations of soils and bacterial treatments were used as the soil treatments: sterile soil (S), sterile inoculated soils (SI), non-treated soil (N) and non-treated inoculated soils (NI). Seedlings of the Australian species were inoculated with rhizobia cultured from nodules of the same species, while seedlings of the Spanish species were inoculated with cultures from each of the Australian species. All Australian rhizobia infected all the Spanish species, suggesting a high degree of 'promiscuity' among the bacteria and plant species. The results from comparing six Spanish and six Australian species according to their biomass and total nitrogen in the presence (NI) or absence (S) of rhizobia showed that all species benefitted from nodulation (1.02–12.94 times), with R.�sphaerocarpa and C. striatus benefiting more than the native species. Inoculation (SI and NI) was just as effective as, or more effective than the non-treated soil (i.e. non-sterile) in inducing nodules. Nodules formed on the Spanish legumes were just as efficient at fixing N2 as were those formed on the Australian legumes. Inoculation was less effective than non-treated soil at increasing biomass but just as effective as the soil at increasing nitrogen content. Promiscuity in the legume–bacteria symbiosis should increase the ability of legumes to spread into new habitats throughout the world.

Stoechadone: a New Naphthoquinone From Conospermum stoechadis

1996 ◽  
Vol 49 (2) ◽  
pp. 197 ◽  
Author(s):  
AM Aguinaldo ◽  
JA Armstrong ◽  
JR Cannon ◽  
SM Colegate ◽  
MF Comber ◽  
...  
Keyword(s):  
Spectroscopic Methods ◽  
Root Bark ◽  
Australian Plant ◽  
Short Synthesis ◽  
Western Australian

Extraction of the dried root bark of the Western Australian plant Conospermum stoechadis Endl . has yielded 3,6,7-trimethoxy-2-methylnaphthalene-1,4-dione, stoechadone (1). The structure was elucidated by spectroscopic methods and was confirmed by a short synthesis from methyl homoveratrate (3).

Western Australian Species-Rich Kwongan (Sclerophyllous Shrubland) Affected by Drought

1980 ◽  
Vol 28 (6) ◽  
pp. 573 ◽  
Author(s):  
RJ Hnatiuk ◽  
AJM Hopkins
Keyword(s):  
Water Stress ◽  
Drought Stress ◽  
Western Australia ◽  
Vascular Plants ◽  
Perennial Species ◽  
Australian Species ◽  
Vegetative Regeneration ◽  
Average Rainfall ◽  
Two Factors ◽  
Western Australian

Observations of responses to aseasonal water stress are reported for 238 above-ground perennial species of native vascular plants in a 20 km2 area of Western Australia surveyed during the second consecutive year of below average rainfall. Eighty-six species (36%) were found with dead individuals. Both vegetative regeneration and seedling regeneration appeared to be successful means of surviving drought stress in this region. The drought affected species of the families Proteaceae and Epacridaceae more than those of other major families. There are similarities in the response of the vegetation to the two main, irregularly occurring phenomena, aseasonal drought and fire: both can affect vegetation over large areas and yet leave considerable patches within the area that are little affected. Together these two factors contribute to the production of complex and dynamic mosaic-patterns in the vegetation.

In situ template-free synthesis of a novel 3D p–n heteroarchitecture Ag3PO4/Ta3N5 photocatalyst with high activity and stability under visible radiation

RSC Advances ◽  
2015 ◽  
Vol 5 (77) ◽  
pp. 62519-62526 ◽  
Author(s):  
Wen Wang ◽  
Hua-Bin Fang ◽  
Yan-Zhen Zheng ◽  
Yanke Che ◽  
Xia Tao ◽  
...  
Keyword(s):  
Visible Light ◽  
High Activity ◽  
Light Response ◽  
Visible Radiation ◽  
Response Characteristics ◽  
Visible Light Response ◽  
Template Free

This 3D heteroarchitecture Ag3PO4/Ta3N5 photocatalyst shows double visible-light response characteristics and sufficient hetero-interfaces between Ag3PO4 and Ta3N5.

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