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Record W2220130481 · doi:10.2134/agronmonogr50.c10

Sulfur Nutrition and Wheat Quality

2008· book-chapter· en· W2220130481 on OpenAlex
Hamid Naeem

Why this work is in the frame

A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.

affAt least one author lists a Canadian institution in the pinned OpenAlex snapshot.

Bibliographic record

VenueAgronomy monograph/Agronomy · 2008
Typebook-chapter
Languageen
FieldAgricultural and Biological Sciences
TopicPotato Plant Research
Canadian institutionsUniversity of Manitoba
Fundersnot available
KeywordsSulfurQuality (philosophy)Agricultural engineeringEnvironmental scienceAgronomyBiologyMaterials scienceEngineeringMetallurgyPhysics

Abstract

fetched live from OpenAlex

Global sulfur deficiency in agricultural lands is the result of gradual replacement of sulfur-containing fertilizers with high purity nitrogen fertilizers, introduction of high yielding crop cultivars, and since 1970s strict restrictions on sulfur dioxide emissions to reduce greenhouse gases. Wheat (Triticum aestivum L.) has a low sulfur requirement, and an addition of 15 to 20 kg ha-1 is usually sufficient for optimum yield and quality. Grain sulfur content of =1.2 mg g-1 and a nitrogen/sulfur ratio of =16:1 appears to be critical for optimum quality characteristics. The endosperm storage proteins or prolamins determine the end-use quality of wheat flour. They are classified on the basis of their solubility in different solvents, structure, and molecular size. There are three main groups based on the structure, namely sulfur-rich, sulfur-poor, and high molecular weight glutenin subunits (HMW-GS). Sulfur deficiency does not affect total grain protein but does affect accumulation of different protein groups during grain development. Amounts of sulfur-poor proteins such as ?-gliadins and HMW-GS increase at the expense of sulfur-rich protein groups such as a-, ß-, and ?-gliadins and low molecular weight glutenin subunits (LMW-GS). HMW- and LMW-GS are polymeric proteins held together by disulfide bonds. Sulfur deficiency reduces the accumulation of LMW-GS, total amount of glutenins, and changes HMW-GS/LMW-GS ratio, thus a shift in molecular weight distribution of gluten proteins toward higher molecular weight. These quantitative changes in protein composition modify flour functional properties. Dough made from sulfur-deficient flour is stronger, has increased mixing requirements, reduced extensibility, and loaf volume. Sulfur deficient grains show higher pearling index. Nonprotein nitrogen significantly increases because of accumulation of excessive amounts of free asparagine and glutamine. Free asparagine serves as a precursor in the formation of acrylamide, a carcinogenic neurotoxin, during baking, roasting, and frying because of the Maillard reaction. Inadequate sulfur supply promotes accumulation of increased levels of asparagine thus posing a health risk. Recent studies have shown that accumulation of free asparagine in wheat grain depends on wheat cultivar, soil type, and growing season weather conditions. Sprouting significantly increases quantity of free asparagine in the grain. Ways to reduce free asparagine in the raw materials and formation of acrylamide in the processed food are summarized.

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.

Full frame distilled prediction

Teacher imitation

Not 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.

metaresearch head score (Codex)0.000
metaresearch head score (Gemma)0.000
Version: codex-gemma-dda1882f352aValidation status: machine_predicted_unvalidated
Candidate categoriesMeta-epidemiology (narrow), Insufficient payload (model declined to judge)
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Not applicable · Consensus signal: none
GenreCandidate signal: Empirical · Consensus signal: none
Teacher disagreement score0.641
Threshold uncertainty score1.000

Codex and Gemma teacher scores by category

CategoryCodexGemma
Metaresearch0.0000.000
Meta-epidemiology (narrow)0.0010.000
Meta-epidemiology (broad)0.0010.000
Bibliometrics0.0000.000
Science and technology studies0.0010.001
Scholarly communication0.0000.000
Open science0.0010.000
Research integrity0.0010.001
Insufficient payload (model declined to judge)0.0020.000

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.

Opus teacher head0.052
GPT teacher head0.254
Teacher spread0.202 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it