Steroid derivatives in which one or more bridges is formed between carbon atoms at any locant in any of the rings.

Four new 3,5-cyclosteroidal saponins from Dracaena surculosa. (1/2)

Further search for steroidal compounds contained in Dracaena surculosa (Agavaceae) led to the isolation of two new 3,5-cyclospirostanol saponins (1, 2) and two new 3,5-cyclofurostanol saponins (3, 4). Their structural assignment was established by spectroscopic analysis and a few chemical transformations as (24S,25R)-1beta-[(beta-D-fucopyranosyl)oxy]-6beta-hydroxy-3alpha,5alpha-cyclospir ostan-24-yl beta-D-glucopyranoside (1), (24S,25R)-1beta-[(beta-D-glucopyranosyl)oxy]-6beta-hydroxy-3alpha,5alpha-cyclospi rostan-24-yl beta-D-glucopyranoside (2), (25S)-1beta-[(beta-D-glucopyranosyl)oxy]-6beta-hydroxy-22alpha-methoxy-3alpha,5al pha-cyclofurostan-26-yl beta-D-glucopyranoside (3), and (25S)-1beta-[(beta-D-fucopyranosyl)oxy]-6beta-hydroxy-22alpha-methoxy-3alpha,5alp ha-cyclofurostan-26-yl beta-D-glucopyranoside (4), respectively.  (+info)

S-adenosyl-L-methionine-cycloartenol methyltransferase activity in cell-free systems from Trebouxia sp. and Scenedesmus obliquus. (2/2)

1. Homogenates prepared from Trebouxia sp. 213/3 and Scenedesmus obliquus exhibited S-adenosyl-l-methionine-cycloartenol methyltransferase activity. 2. The products of the reaction, with cycloartenol as the substrate, were 24-methylenecycloartanol and cyclolaudenol. 3. Optimal enzyme activity was found in homogenates prepared at pH7.6 and the transmethylase was distributed between the supernatant and microsomal fractions of the Trebouxia homogenate. 4. The relevance of these results is discussed in relation to C(28) and C(29) sterol production in the algae.  (+info)

Algae Detail UTEX Number: SNO154Class: ChlorophyceaeStrain: Trebouxia sp.Media: Soil Extract MediumOrigin: Mt Mansfield, Connecticut, USADescription of Location
The scenedesmus obliquus mitochondrial code (translation table 22) is a genetic code found in the mitochondria of Scenedesmus obliquus. AAs = FFLLSS*SYY*LCC*WLLLLPPPPHHQQRRRRIIIMTTTTNNKKSSRRVVVVAAAADDEEGGGG Starts = -----------------------------------M---------------------------- Base1 = TTTTTTTTTTTTTTTTCCCCCCCCCCCCCCCCAAAAAAAAAAAAAAAAGGGGGGGGGGGGGGGG Base2 = TTTTCCCCAAAAGGGGTTTTCCCCAAAAGGGGTTTTCCCCAAAAGGGGTTTTCCCCAAAAGGGG Base3 = TCAGTCAGTCAGTCAGTCAGTCAGTCAGTCAGTCAGTCAGTCAGTCAGTCAGTCAGTCAGTCAG Bases: adenine (A), cytosine (C), guanine (G) and thymine (T) or uracil (U). Amino acids: Alanine (Ala, A), Arginine (Arg, R), Asparagine (Asn, N), Aspartic acid (Asp, D), Cysteine (Cys, C), Glutamic acid (Glu, E), Glutamine (Gln, Q), Glycine (Gly, G), Histidine (His, H), Isoleucine (Ile, I), Leucine (Leu, L), Lysine (Lys, K), Methionine (Met, M), Phenylalanine (Phe, F), Proline (Pro, P), Serine (Ser, S), Threonine (Thr, T), Tryptophan (Trp, W), Tyrosine (Tyr, Y), Valine (Val, V) Scenedesmus obliquus List ...
由於現在能源危機及溫室效應的影響,微藻的應用被逐漸重視,微藻具有快速生長、高油脂含量與豐富的營養成分,對水質的淨化也有一定的效果。在本實驗中,利用Scenedesmus obliquus的光自營培養所探討的三個研究方向:(1)改變培養環境或培養基成分,探討S. obliquus濃度與葉黃素含量影響。結果顯示加壓條件對S. obliquus藻細胞生長造成生長遲緩的現象發生;紫外光UV-A連續照光會有明顯抑制生長效果;添加酚(Phenol)會抑制藻細胞生長;不同顏色LED光源條件,可獲得在白光條件下培養S. obliquus濃度最高可至2.45 g/L。葉黃素方面,在最後兩天添加紫外光UV-A照射可增加葉黃素含量至0.48% d.w.; 在加壓條件下與添加酚(Phenol)時對S. obliquus內的葉黃素含量並無太大的影響。(2)探討20.0 L生物光反應器培養S. obliquus與連續式培養之影響。結果顯示,在不同進氣量(vvm)條件下
Biodiesel from microalgae seems to be the only renewable biofuel that has the potential to completely replace the petroleum-derived transport fuels. Theref
After considerable fiddling, Ive finally managed to update the phylogeny and host-association matrix for the most common lichen photobiont, Trebouxia. The methods are similar to those used in my previous post on Nostoc rbcX sequences, to the extent that the same script can used to run both analyses. It was modified to use algal species names rather than host names when analysing Trebouxia, to colour the clades in the tree, and to count the number of times each photobiont lineage has been sampled from each lichen genus. All the steps required for this analysis can be see here. All of the files that were generated are available here.. I had previously built a tree from 1840 ITS sequences and identified lineages corresponding to ten named species and five unnamed species. Since then, there have been a number of important papers that have expanded the known diversity of the group and begun to codify the novel lineages. My current ITS tree (PDF version here) has 2335 sequences and includes 12 named ...
Compiled by a diverse team of experts, with experience in scientific and industrial fields, the Comprehensive Report for Wastewater Treatment Using Algae is the first report that provides in-depth analysis and insights on this important field. It uses innumerable data and information from a wide variety of expert sources and market studies, and distills these inputs and data into intelligence and a roadmap that you can use. More » ...
where nitrogen and phosphorus concentrations were at its maximum level (+1). On the other hand, with treatments 9 (N0) and 11 (P0), the lowest AFDW, 0.80 and 0.62 g∙L−1, respectively, were obtained. Therewith, the maximum biomass value obtained was 2.3 times higher than the reports of [1] , which reported a biomass concentration of 0.54 g∙L−1 when cultivating Scenedesmus obliquus with ambient CO2, and when cultivated at 35% of CO2 supply, it was reported a maximum biomass value of 1.39 g∙L−1. The maximum biomass of 1.24 g∙L−1 obtained with the Scenedesmus sp. SCIB-01 strain, without CO2 supply, was comparable to reports of [3] who obtained biomass concentration of 1.34 g∙L−1 using S. obliquus cultivated at 2.5% CO2 feeding concentration. [8] reported S. obliquus cultivation at 30% CO2 concentration, and obtained a biomass concentration of 1.03 g∙L−1. [18] obtained a maximum biomass production of 0.41 g∙L−1 using Desmodesmus sp. phototrophically cultivated, also lower ...

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Steroids containing the fundamental tetracyclic unit with no methyl groups at C-10 and C-13 and with no side chain at C-17. The concept includes both saturated and unsaturated derivatives ...

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