Nutrient Pulses
Nutrient Pulses - Related Videos
10:48
Nutrients in Aquatic Ecosystems
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2023
Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University Nitrogen and phosphorus are essential plant nutrients found in aquatic ecosystems and both are monitored as a part of water quality testing because in excess amounts they can cause significant water quality problems. Nitrogen in water is measured as the common form nitrate (NO3-) that is dissolved in water and readily absorbed by photosynthesizers such as algae. The common form of phosphorus measured is phosphate...
09:13
Hydroponics: A Versatile System to Study Nutrient Allocation and Plant Responses to Nutrient Availability and Exposure to Toxic Elements
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Cited by 102 •
2016
Here, we present an easy-to-follow protocol to establish a successful hydroponic system for plant nutrition studies. This protocol has been extensively tested in Arabidopsis and can easily be adapted to other plant species to study specific nutritional requirements or the effect of non-essential elements on plant growth and development.
01:16
Pulse
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2024
When the heart pumps blood out, arterial elastic fibers play a crucial role in sustaining a high-pressure gradient. They expand to accommodate the received blood and then recoil - a process known as the pulse that can be either manually palpated or electronically quantified. Despite a reduction in its effect with increased distance from the heart, elements of the pulse's systolic and diastolic components persist, observable even at the arteriole level. The pulse serves as a clinical indicator...
13:31
Soil Nutrient Analysis: Nitrogen, Phosphorus, and Potassium
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2023
Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University In this experiment, three soil macronutrients are chemically extracted, combined with color-based reagents, then analyzed using color to determine the nutrient concentration present in the soil sample. Nitrogen, phosphorus, and potassium are the main components of soil fertilizer. These methods isolate each nutrient from the soil into a solution that can be analyzed using turbidity and color to determine the...
01:19
Absorption of Nutrients
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2024
Absorption refers to taking dietary nutrients from the intestinal lumen for transportation throughout the body. After digestion in the small intestine, carbohydrates, proteins, and fats are broken down into simpler forms. These essential macronutrients and other vital substances, such as vitamins, minerals, and water, are then prepared for absorption into the bloodstream. Enterocytes, which are specialized polar epithelial cells, line the mucosa of the small intestinal walls. These cells...
FAQs
Cells detect temporary changes in substrate or growth-factor concentrations through metabolic and signaling pathways. These pathways translate altered resource availability into responses that can affect growth, differentiation, and product formation. Because the stimulus changes over time rather than remaining constant, nutrient pulses help bioengineers examine and regulate how cells adapt to dynamic environmental conditions.
The main controllable variables are pulse timing, composition, and dose. Timing determines when cells encounter the resource change, composition specifies whether the addition contains carbon, nitrogen, growth factors, or another supported nutrient, and dose controls the magnitude of the change. Adjusting these variables changes the resulting cellular response and process behavior.
Continuous feeding maintains ongoing nutrient delivery, whereas Nutrient Pulses create temporary changes in resource availability. The pulsed approach can help prevent both nutrient depletion and excess while using additions more selectively. This difference gives engineers a way to study and control time-dependent cellular behavior instead of exposing cultures to a relatively constant supply.
A basic workflow is to select the nutrient or growth factor, specify the pulse dose and composition, and schedule when the addition will occur. Researchers then adjust the timing or amount to influence the desired cellular response, such as growth, differentiation, or product formation. The strategy can be adapted to the requirements of the biological system under study.
Applications include cell cultures, microbial bioprocesses, and tissue-engineered systems. In each setting, a temporary change in carbon, nitrogen, growth factors, or other substrates can alter cellular behavior and process performance. This broad use makes the approach relevant to systems in which engineers need to regulate biological function through controlled changes in resource availability.
Researchers can evaluate changes in growth, differentiation, and product formation, along with whether the process avoids nutrient depletion or excess. These outcomes show how the system responds to the timing, composition, and dose of an addition. In bioengineering, the resulting information supports more precise process control and reveals how dynamic environments shape biological function.