Chromodorane diterpenes from the tropical dorid nudibranch Chromodoris cavae

1991 ◽  
Vol 69 (5) ◽  
pp. 768-771 ◽  
Author(s):  
Sandra A. Morris ◽  
E. Dilip de Silva ◽  
Raymond J. Andersen
Keyword(s):  
Key Words ◽  
Spectroscopic Analysis ◽  
Nmr Assignments ◽  
Carbon Skeleton

Two novel diterpenoids, chromodorolides A (1) and B (2), have been isolated from skin extracts of the tropical dorid nudibranch Chromodoris cavae. Complete NMR assignments are presented for chromodorolide A (1). The structure of chromodorolide B (2) has been solved by spectroscopic analysis. Chromodorolides A (1) and B (2) are the first examples of diterpenoids with the highly rearranged chromodorane carbon skeleton. Key words: nudibranch, diterpene, chromodorane, Chromodoris.

Triterpenoid glycosides from the Northeastern Pacific marine sponge Xestospongia vanilla

1991 ◽  
Vol 69 (9) ◽  
pp. 1352-1364 ◽  
Author(s):  
Sandra A. Morris ◽  
Peter T. Northcote ◽  
Raymond J. Andersen
Keyword(s):  
Key Words ◽  
Marine Sponge ◽  
Spectroscopic Analysis ◽  
Carbon Skeleton ◽  
Chemical Degradation ◽  
Triterpenoid Glycoside ◽  
Northeastern Pacific ◽  
Triterpenoid Glycosides

Isoxestovanin A (6), xestovanin B (7), xestovanin C (8), dehydroxestovanin A (9), epidehydroxestovanin A (10), dehydroxestovanin C (11), and secodehydroxestovanin A (12), seven new triterpenoid glycosides, have been isolated from the Northeastern Pacific sponge Xestospongia vanilla. The structures of the metabolites were determined by a combination of spectroscopic analysis and chemical degradation. The aglycone of 6 has the new isoxestovanane triterpenoid carbon skeleton. Compounds 7, 8, and 11 are the first X. vanilla triterpenoid glycosides known to contain three monosaccharide subunits. Key words: triterpenoid, glycoside, sponge, Xestospongia.

scholarly journals Chaetolactone, A Skeletally New Cyclopentenone from Chaetomium sp. C521

2018 ◽  
Vol 13 (7) ◽  
pp. 1934578X1801300 ◽  
Author(s):  
Wen-Bo Han ◽  
He Li ◽  
Hui-Yi Zhou ◽  
Jia Meng ◽  
Jin-Ming Gao ◽  
...  
Keyword(s):  
Botrytis Cinerea ◽  
Absolute Configuration ◽  
Magnaporthe Oryzae ◽  
Spectroscopic Analysis ◽  
Alternaria Solani ◽  
Carbon Skeleton ◽  
The Absolute

Chaetolactone, a new polyketide with an unprecedented carbon skeleton, was constructed by Chaetomium sp. C521. Its structure was characterized by a combination of detailed spectroscopic analysis and ECD method, which facilitated the establishment of the absolute configuration for chaetolactone. The new compound was tested for anti-phytopathogenic activity against Botrytis cinerea, Alternaria solani, Gibberella saubinettii, and Magnaporthe oryzae, but exhibited negligible inhibition at a concentration of 20 μM.

The structure and partial synthesis of imbricatine, a benzyltetrahydroisoquinoline alkaloid from the starfish Dermasterias imbricata

1991 ◽  
Vol 69 (1) ◽  
pp. 20-27 ◽  
Author(s):  
David L. Burgoyne ◽  
Shichang Miao ◽  
Charles Pathirana ◽  
Raymond J. Andersen ◽  
William A. Ayer ◽  
...  
Keyword(s):  
Key Words ◽  
Absolute Configuration ◽  
Spectroscopic Analysis ◽  
Chemical Degradation ◽  
Model Compounds ◽  
Partial Synthesis ◽  
The Absolute

The structure of imbricatine (1), a cytotoxic metabolite of the starfish Dermasterias imbricata, has been determined by spectroscopic analysis and chemical degradation. Synthesis of model compounds 7 and 18 provided evidence for the absolute configuration and constitution of the benzyltetrahydroisoquinoline substructure of imbricatine. Key words: imbricatine, asteroid, alkaloid.

scholarly journals Crown Procyanidin Tetramer: A Procyanidin with an Unusual Cyclic Skeleton with a Potent Protective Effect against Amyloid-β-Induced Toxicity

Molecules ◽  
2019 ◽  
Vol 24 (10) ◽  
pp. 1915 ◽  
Author(s):  
Liming Zeng ◽  
Pere Pons-Mercadé ◽  
Tristan Richard ◽  
Stéphanie Krisa ◽  
Pierre-Louis Teissèdre ◽  
...  
Keyword(s):  
Protective Effect ◽  
Spectroscopic Analysis ◽  
Amyloid Β ◽  
Carbon Skeleton ◽  
Protective Effects ◽  
Grape Skin ◽  
Plant Kingdom ◽  
First Time ◽  
Macrocyclic Structure

The structure of a new procyanidin tetramer, which we call a crown procyanidin tetramer, with an unprecedented macrocyclic structure has been characterized for the first time. Its comprehensive spectroscopic analysis revealed that it is a symmetric procyanidin tetramer composed of four (−)-epicatechin sub-units linked alternatively via 4β→8 or 4β→6 B-type interflavanyl linkages to form the macrocyclic structure. This NMR-characterized carbon skeleton has never been reported before for procyanidins in grape or in wine, neither in the plant kingdom. Surprisingly, the crown procyanidin tetramer appeared to be specifically localized in grape skin, contrasting with the oligomeric and polymeric procyanidins present in seed, skin, and bunch stem. Moreover, this crown procyanidin tetramer showed promising protective effects against amyloid-β induced toxicity.

Botryococcenone, an Oxygenated Botryococcene From Botryococcus braunii

1991 ◽  
Vol 44 (2) ◽  
pp. 313 ◽  
Author(s):  
RE Summons ◽  
RJ Capon
Keyword(s):  
Green Alga ◽  
Catalytic Hydrogenation ◽  
Spectroscopic Analysis ◽  
Saturated Hydrocarbon ◽  
Botryococcus Braunii ◽  
Carbon Skeleton ◽  
Lipid Extract

A new botryococcene (5) incorporating an unprecedented ketone functionality has been identified in the lipid extract of an Australian collection of the green alga Botryococcus braunii Kutzing . The structure was established by detailed n.m.r. and mass spectroscopic analysis. A saturated hydrocarbon (8) prepared from this ketone by catalytic hydrogenation and Wolff-Kishner reduction has a different carbon skeleton to that of (9) prepared by hydrogenation of the co-occurring C33 botryococcene.

Characterization of Chemical Impurities in Glutaraldehyde

1975 ◽  
Vol 33 ◽  
pp. 620-621
Author(s):  
B. J. Grenon ◽  
A. J. Tousimis
Keyword(s):  
Glutaric Acid ◽  
Spectroscopic Analysis ◽  
Aldol Condensation ◽  
Condensation Product ◽  
Amorphous Solid ◽  
Water Soluble ◽  
Impurity Component ◽  
Chemical Impurities ◽  
Soluble Liquid

Ever since the introduction of glutaraldehyde as a fixative in electron microscopy of biological specimens, the identification of impurities and consequently their effects on biologic ultrastructure have been under investigation. Several reports postulate that the impurities of glutaraldehyde, used as a fixative, are glutaric acid, glutaraldehyde polymer, acrolein and glutaraldoxime.Analysis of commercially available biological or technical grade glutaraldehyde revealed two major impurity components, none of which has been reported. The first compound is a colorless, water-soluble liquid with a boiling point of 42°C at 16 mm. Utilizing Nuclear Magnetic Resonance (NMR) spectroscopic analysis, this compound has been identified to be — dihydro-2-ethoxy 2H-pyran. This impurity component of the glutaraldehyde biological or technical grades has an UV absorption peak at 235nm. The second compound is a white amorphous solid which is insoluble in water and has a melting point of 80-82°C. Initial chemical analysis indicates that this compound is an aldol condensation product(s) of glutaraldehyde.

Elemental analysis of human erythrocytes

1989 ◽  
Vol 47 ◽  
pp. 242-243
Author(s):  
S. A. Livesey ◽  
A. A. del Campo ◽  
E. S. Griffey ◽  
D. Ohlmer ◽  
T. Schifani ◽  
...  
Keyword(s):  
Sample Preparation ◽  
Elemental Analysis ◽  
Human Erythrocyte ◽  
Spectroscopic Analysis ◽  
Model System ◽  
Human Erythrocytes ◽  
List Type ◽  
Chemical Fixation ◽  
Ethanol Dehydration ◽  
Lowicryl K4m

The aim of this study is to compare methods of sample preparation for elemental analysis. The model system which is used is the human erythrocyte. Energy dispersive spectroscopic analysis has been previously reported for cryofixed and cryosectioned erythrocytes. Such work represents the reference point for this study. The use of plastic embedded samples for elemental analysis has also been documented. The work which is presented here is based on human erythrocytes which have been either chemically fixed and embedded or cryofixed and subsequently processed by a variety of techniques which culminated in plastic embedded samples.Heparinized and washed erythrocytes were prepared by the following methods for this study :(1). Chemical fixation in 4% paraformaldehyde/0.25% glutaraldehyde/0.2 M sucrose in 0.1 M Na cacodylate, pH 7.3 for 30 min, followed by ethanol dehydration, infiltration and embedding in Lowicryl K4M at -20° C.

Multislice imaging of gastrointestinal stromal tumors

2018 ◽  
pp. 3-14
Keyword(s):  
Computed Tomography ◽  
Key Words ◽  
Gold Standard ◽  
Gastrointestinal Stromal Tumors ◽  
Mesenchymal Tumors ◽  
Stromal Tumors ◽  
Preferential Localization ◽  
Multislice Imaging ◽  
Computed Tomography Diagnosis

Gastrointestinal stromal tumors (GIST) are the most common mesenchymal tumors of the digestive tract (1%). These tumors express the CD 117 in 95% of cases. The stomach is the preferential localization (70%). Diagnosis is difficult and sometimes late. Progress of imaging has greatly improved the management and the prognosis. Computed tomography (CT) is the gold standard for diagnosis, staging, and treatment follow-up. The increasing recognition of GIST’s histopathology and the prolonged survival revealed some suggestive imaging aspects. Key words: gastro-intestinal stromal tumors; computed tomography; diagnosis

METHODS OF CONSULTING ON STUDYING THE DEGREE OF MOISTURE SUPPLY OF SLOPE LANDS FOR AGRICULTURAL PRODUCTION IN AZERBAIJAN

2018 ◽  
Author(s):  
Prof.RAE Aliev Z.H.
Keyword(s):  
Key Words ◽  
Agricultural Production ◽  
Soil Ecology ◽  
Arable Soil ◽  
Clean Technology ◽  
Agricultural Product ◽  
Current Information ◽  
Moisture Supply ◽  
Managerial System

The current information on moisture and the temperature of the ground in managerial system by production to agricultural product necessary, in the first place, for taking the operative decisions at development ecological clean technology irrigation under growing agricultural cultures to achieve the maximum harvest. Key words: aerospace methods, COW, moisture, moisture test, arable, soil, ecology, vafer humidity, drill, graduation, tool, etc.

PELAKSANAAN HUKUM KEWARISAN ISLAM DI PENGADILAN AGAMA BANTEN

ALQALAM ◽  
2013 ◽  
Vol 30 (1) ◽  
pp. 158
Author(s):  
Yusuf Somawinata
Keyword(s):  
Key Words ◽  
Islamic Law ◽  
Survey Methods ◽  
Adopted Children ◽  
Inheritance Law ◽  
Library Research ◽  
The Ideal

This article aims at describing the obseroance of wasiat wajibah (compulsory bequeathment) in the Islamic court of Banten, analyzing the provision of the substitute heir and adopted children in the Compilation of  Islamic Law (KHI). In addition, the ideal laws to manage the innheritance rules in Indonesia. This article is library research by using doctrinal approach and using case study and survey methods. The data was, then, analyzed by using analytical descriptive and analytical correlative methods. The result showed that the observance of wasiat wajibah in the Islamic court of  Banten employed by judges is by using the Mawali Hazairin’s Doctrine. The criteria of the adoption of substitute heir and adopted children in the KHI is the attempts of Ulama and many judgees junst in giving legal justice and certainty to the society.   Key Words: Islamic Inheritance Law, Compilation of Islamic Law, Islamic court of  Banten

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