Distributions of Iron-Oxidizing Bacteria in Sediment Cores From the Special Areas in the Arctic Ocean
Bibliographic record
Abstract
Analyses of iron-oxidizing bacteria(FeOB) were made of 184 samples of 10 sediment cores from the Canada Basin and the Chukchi Sea by means of plate culture,and their occurrence percentages and contents were studied.The results have shown that the occurrence percentages of FeOB in the samples cultivated at 4 ℃ and 25 ℃ are 10.33% and 40.22% respectively and the contents of FeOB(in wet samples,the same hereinafter) range from non-detected(ND) to 8.40×106 CFU/g,with an average of 7.76×104 CFU/g,in the samples cultivated at 4 ℃ and from ND to 1.00×108 CFU/g,with an average of 1.40×106CFU/g,in the samples cultivated at 25 ℃.The contents of FeOB in the sediment cores of the study area are higher than those in the abyssal sediments of the Pacific Ocean.Compared with previous studies carried out in fresh water,the FeOB contents in the study area are all dropped in the range of the previous results,but are lower than those in the bacteria mat.This indicates that the micro-habitat-environment in the sediments of the study area is favorable for the regeneration of FeOB. The distributions of FeOB in different water depth,different longitude and latitude and different sedimentary depth have been discussed.It has been shown that the occurrence percentages of FeOB tend to increase with sedimentary depth and the contents of FeOB tend to be lower in the shallow layers and higher in the deeper layers.The latitudinal distributions of FeOB show a wide range and an expanding tendency.The occurrence percentages and contents of FeOB increase with water depth and vary in a jumping way.Higher occurrence percentages and contents of FeOB occur in relatively deeper water.With increasing in distance away from the coast,however,the growth of FeOB has been restricted due to the lack of nutrient matter supply.The cultivation temperature can also exert influences,to certain extent,to the distributions of FeOB.With the increasing in temperature not only the occurrence percentage but also the content of FeOB is increased.This may probably indicate that relatively higher temperature is more favorable for the growth of some of the FeOB.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 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) | 0.002 | 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 teacher head, 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".