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).

Diterpenoids from the Root Bark of Azadirachta indica

1989 ◽  
Vol 44 (10) ◽  
pp. 1279-1282 ◽  
Author(s):  
Iffat Ara ◽  
Bina Shaheen Siddiqui ◽  
Shaheen Faizi ◽  
Salimuzzaman Siddiqui
Keyword(s):  
Azadirachta Indica ◽  
Spectroscopic Methods ◽  
Root Bark

From the root bark of Azadirachta indica A. Juss (neem) two new diterpenes nimbilicin and nimbocidin have been isolated and their structures established through chemical and spectroscopic methods.

scholarly journals Berbanine: A New Isoquinoline-Isoquinolone Alkaloid from Berberis Vulgaris (Berberidaceae)

2013 ◽  
Vol 8 (4) ◽  
pp. 1934578X1300800 ◽  
Author(s):  
Anna Hošt'álková ◽  
Zdeněk Novák ◽  
Milan Pour ◽  
Anna Jirošová ◽  
Lubomír Opletal ◽  
...  
Keyword(s):  
2D Nmr ◽  
Spectroscopic Methods ◽  
Root Bark ◽  
Berberis Vulgaris

A new isoquinoline-isoquinolone alkaloid was isolated from the root bark of Berberis vulgaris and named berbanine. The structure was established by spectroscopic methods (including 2D NMR, HR-EI-MS).

Metamorphic effects on agate found near the Shap granite, Cumbria, England: as demonstrated by petrography, X-ray diffraction and spectroscopic methods

2007 ◽  
Vol 71 (4) ◽  
pp. 461-476 ◽  
Author(s):  
T. Moxon ◽  
S. J. B. Reed ◽  
M. Zhang
Keyword(s):  
Raman Spectroscopy ◽  
Infrared Spectroscopy ◽  
Western Australia ◽  
Lower Proportion ◽  
Spectroscopic Methods ◽  
X Ray Diffraction ◽  
Red Emission ◽  
X Ray ◽  
Western Australian ◽  
Post Deposition

AbstractAgates from a 430 Ma host at Stockdale Beck, Cumbria, England have been characterized. The crystallite size of the Stockdale Beck agates was found to be ~60% greater than any other agates from five regions aged 400–1100 Ma. Raman spectroscopy identified moganite in all agates tested except those from Stockdale Beck. Infrared spectroscopy showed that the silanol content of the Stockdale Beck agates was near zero. The properties of agates from Stockdale Beck and the 1.84–3.48 Ga metamorphosed hosts found in Western Australia were similar but different from agates found in other hosts aged 400–1100 Ma. Cathodoluminescence demonstrates further differences between agates from hosts aged 13–1100 Ma and those from Stockdale Beck and Western Australia. Agates from the latter areas have a lower proportion of defects causing a red emission band (~660 nm) but an increased proportion of defects causing blue (~470 nm) and orange (~640 nm) emission bands. Agates found in hosts aged 13–1100 Ma are also differentiated from the Stockdale Beck and Western Australian agates in a ternary plot of the relative intensities of violet to blue to orange emission bands. Single scans producing this combination of colours are only found in the Stockdale Beck and Western Australian agates. The properties shown by the Stockdale Beck and Western Australian agates demonstrate that an agate or chalcedony infill can be used to identify post-deposition palaeoheating within a host rock.

Oil glands and ducts in Eucalyptus L'Hérit. I. The phloem and the pith

1969 ◽  
Vol 17 (3) ◽  
pp. 471 ◽  
Author(s):  
SGM Carr ◽  
DJ Carr
Keyword(s):  
General Rule ◽  
Great Variability ◽  
Root Bark ◽  
Secondary Phloem ◽  
Oil Glands ◽  
Vegetative Tissues ◽  
Australian Species ◽  
Full Development ◽  
Taxonomic Implications ◽  
Western Australian

Most (94 %) of the known eucalypts have been examined for the presence of oil glands in vegetative tissues other than the mesophyll and the primary cortex of the stem. In certain species oil glands occur in the pith and, in a few cases, in the midrib as well. In others (series Corymbosae) oil ducts occur in the pith and in the midrib. In others again (Macrantherae Normales) glands are formed in the phloem of both root and shoot. As a general rule, species which have glands or ducts in the pith do not have glands in the phloem, and vice versa. The only exceptions are provided by nine species of the "eudesmioid complex" (defined below). Of eucalypt species, 58 % have no glands in either the pith or the phloem. It is believed that glands never develop in the primary cortex of the root but always in that of the shoot. The occurrence of glands in the pith or the phloem is constant in many species but others show great variability in the numbers of glands present. Possible explanations for the observed variability are suggested and further lines of investigation are indicated. The age of the tree at which glands first appear in the bark varies widely from one species to another and less widely within species; glands appear precociously in root bark. The age of the secondary phloem itself at which it produces glands also shows wide variations between species. In the Corymbosae the full development of the oil duct system is closely correlated with the ontogenetic juvenile-adult foliage change. The taxonomic implications of the presence or absence of glands in the pith and phloem are discussed. The characters have proved useful for field and herbarium identification. The presence or absence of pith glands is particularly valuable in dealing with Western Australian species.

Synchronous monoecy in Ecdeiocoleaceae (Poales), in Western Australia

2014 ◽  
Vol 62 (5) ◽  
pp. 391 ◽  
Author(s):  
Barbara G. Briggs ◽  
Allan Tinker
Keyword(s):  
Western Australia ◽  
Fruit Set ◽  
General Pattern ◽  
Sister Group ◽  
Plant Family ◽  
Effective Barrier ◽  
Australian Plant ◽  
Plant Flower ◽  
The Many ◽  
Western Australian

The Western Australian plant family Ecdeiocoleaceae includes only three species but DNA data show them as the closest living sister-group of the Poaceae. Ecdeiocoleaceae are wind-pollinated and monoecious; spikes produce separate zones of pistillate and staminate flowers, in acropetal succession. Spikes of Ecdeiocolea have up to 45 flowers, with a sequence of zones up the spike, commonly pistillate–staminate–pistillate–staminate–pistillate, with potentially high fruit set in both of the lower pistillate zones. Rainfall in their habitats in semiarid south-western Australia is highly variable and shorter spikes with fewer zones are formed in drought conditions. Georgeantha, with fewer flowers per spike, shows the same general pattern but fewer switches. Synchrony of zonal flowering gives an effective barrier to self-pollination, a form of ‘temporal dioecy’. All spikes on many stems of a plant flower with the conspicuous white stigmas of a pistillate zone or, at a different time, all with the yellow anthers of a staminate zone. Such synchrony is between the many spikes on the plant, not between plants in a population. Features of vegetative and flowering structures and habitat are briefly mentioned.

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 Pentacyclic Triterpenoids from Maytenus cuzcoina

2017 ◽  
Vol 12 (5) ◽  
pp. 1934578X1701200
Author(s):  
Carolina P. Reyes ◽  
Ignacio A. Jiménez ◽  
Isabel L. Bazzocchi
Keyword(s):  
2D Nmr ◽  
Bark Extract ◽  
Phytochemical Analysis ◽  
Spectroscopic Methods ◽  
Root Bark ◽  
Pentacyclic Triterpenoids ◽  
Isolation And Characterization ◽  
Nmr Techniques ◽  
First Time

Phytochemical analysis of the root bark extract of Maytenus cuzcoina (Celastraceae) led to the isolation and characterization of sixteen triterpenoids with a 6/6/6/6/6 pentacyclic system, including the new 22α-hydroxy-29-methoxy-3β-tetradecanoate-olean-12-ene, and 3β,24β-epoxy-29-methoxy-2α,3α,6α-trihydroxy- D:A-friedelane that is reported for the first time as a natural product. This is the first instance of the isolation of a tetradecanoate triterpene ester from a Celastraceae species. The structures were elucidated on the basis of spectrometric and spectroscopic methods, including 1D and 2D NMR techniques.

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