Influence of Nutritional and Cultural Parameters on Polysaccharide Formation by Ganoderma lucidum Grown in Submerged Culture
Bibliographic record
Abstract
The effects of various nutritional and cultural parameters(pH,temperature,nutrient nitrogen availability,C∶N ratio,agitation,inoculum size) on polysaccharide production by submerged cultures of Ganoderma lucidum grown in fermenters on a defined medium under controlled conditions have been evaluated.The bulk of the polysaccharide produced(normally more than 80%) was present in the culture fluid(extracellular polysaccharide,EPS) with usually less than 20% associated with the mycelium(mycelium-associated polysaccharide,MAP).Maximal growth and highest total(extracellular plus mycelium-associated) polysaccharide production were observed in cultures maintained at pH 5.0.Total polysaccharide production over the temperature range 28～34 ℃ was maximal in cultures maintained at 34 ℃ and decreased with a reduction in temperature.Lower nitrogen levels generally resulted in poorer mycelial growth and lower polysaccharide production.Total(mainly extracellular) polysaccharide production was increased by a larger inoculum size whereas an inverse relationship was observed between MAP and inoculum size.EPS material was separated by HPLC into two components with molecular weights of 137 kDa and 4.7 kDa,with retention times of 26.5 and 36.5 min,respectively.MAP gave a single large peak at 40 min with a molecular weight of 1.57 kDa and a much smaller peak at 28 min with a molecular weight of 76.6 kDa,and had a similar HPLC profile to the polysaccharide fraction extracted from the mushroom fruit bodies.Both EPS and MAP material produced under all the conditions adopted in this study gave consistent and reproducible chromatographic profiles.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".