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Related Concept Videos

Scalar Product (Dot Product)01:11

Scalar Product (Dot Product)

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The scalar multiplication of two vectors is known as the scalar or dot product. As the name indicates, the scalar product of two vectors results in a number, that is, a scalar quantity. Scalar products are used to define work and energy relations. For example, the work that a force (a vector) performs on an object while causing its displacement (a vector) is defined as a scalar product of the force vector with the displacement vector.
The scalar product of two vectors is obtained by multiplying...
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Vector Product (Cross Product)01:17

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Vector multiplication of two vectors yields a vector product, with the magnitude equal to the product of the individual vectors multiplied by the sine of the angle between both the vectors and the direction perpendicular to both the individual vectors. As there are always two directions perpendicular to a given plane, one on each side, the direction of the vector product is governed by the right-hand thumb rule.
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The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
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Net production efficiency (NPE) is the efficiency at which organisms assimilate energy into biomass for the next trophic level. Due to low metabolic rates and less energy spent on thermoregulatory processes, the NPE of ectotherms (cold-blooded animals) is 10 times higher than endotherms (warm-blooded animals).
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Measuring how one directional quantity affects another along a specific path involves comparing their orientation and strength. When two such quantities are represented using direction and amount, a numerical result is computed to show how much one acts along the path of the other. This result comes from a rule combining both inputs' horizontal and vertical parts and adding the results.This calculation gives a single value that grows larger when both inputs point in similar directions and...
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Dot Product01:29

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The dot product is an essential concept in mathematics and physics.
In engineering, the dot product of any two vectors is the product of the magnitudes of the vectors and the cosine of the angle between them. It is denoted by a dot symbol between the two vectors.
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Novel Production Protocol for Small-scale Manufacture of Probiotic Fermented Foods
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Yogurt Production.

Seiji Nagaoka1

  • 1Fermented Milk Development Department, Food Development Laboratories, R&D Division, Meiji Co., Ltd., Hachiouji, Tokyo, Japan. seiji.nagaoka@meiji.com.

Methods in Molecular Biology (Clifton, N.J.)
|December 4, 2018
PubMed
Summary
This summary is machine-generated.

Yogurt production relies on lactic acid bacteria, like Streptococcus thermophilus and Lactobacillus delbrueckii subsp. bulgaricus, to ferment milk. These bacteria create lactic acid and metabolites that influence the final yogurt quality.

Keywords:
FermentationLactic acid bacteriaLactobacillus delbrueckii subsp. bulgaricusMicrobiological analysisStarter cultureStreptococcus thermophilusTexture analysisYogurt

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Area of Science:

  • Food Science
  • Microbiology
  • Dairy Technology

Background:

  • Yogurt is a widely consumed fermented dairy product.
  • Lactic acid bacteria (LAB) are key to yogurt fermentation.
  • Specific LAB, Streptococcus thermophilus and Lactobacillus delbrueckii subsp. bulgaricus, are crucial.

Purpose of the Study:

  • To summarize general methods for yogurt production.
  • To highlight the role of lactic acid bacteria in yogurt making.
  • To discuss the impact of bacterial metabolites on yogurt quality.

Main Methods:

  • Fermentation of milk using specific lactic acid bacteria strains.
  • Monitoring of pH changes during the coagulation process.
  • Analysis of bacterial metabolites, including acids and exopolysaccharides.

Main Results:

  • Lactic acid production lowers pH, causing milk protein coagulation.
  • Bacterial metabolites such as carbonyl compounds and acids are formed.
  • Exopolysaccharides contribute to yogurt texture and quality.

Conclusions:

  • The described methods are fundamental to commercial yogurt production.
  • Understanding bacterial activity and metabolite formation is essential for controlling yogurt characteristics.
  • This chapter provides a foundational overview of yogurt manufacturing processes.