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What is Glycolysis?00:56

What is Glycolysis?

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Cells make energy by breaking down macromolecules. Cellular respiration is the biochemical process that converts "food energy" (from the chemical bonds of macromolecules) into chemical energy in the form of adenosine triphosphate (ATP). The first step of this tightly regulated and intricate process is glycolysis. The word glycolysis originates from the Latin glyco (sugar) and lysis (breakdown). Glycolysis serves two main intracellular functions: generating ATP and generating...
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Glycolysis01:23

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Glycolysis, the Embden-Meyerhof pathway, is a central metabolic pathway involved in glucose catabolism. It is highly conserved across most organisms, reflecting its fundamental role in cellular energy production. This process occurs in the cytoplasm and can function both in the presence and absence of oxygen, making it versatile for various organisms and environmental conditions.Stages of GlycolysisGlycolysis is a ten-step pathway that converts glucose into pyruvate, generating a net gain of...
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In cellular metabolism (the complete breakdown of glucose to extract energy),  glycolysis is the first step. Glycolysis takes place in the cytoplasm of both prokaryotic and eukaryotic cells. Glucose enters heterotrophic cells in two ways. One method is through secondary active transport, where the transport takes place against the glucose concentration gradient. The other mechanism uses a group of integral proteins called GLUT proteins, also known as glucose transporter proteins. These...
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Nearly all the energy used by cells comes from the bonds that make up complex organic compounds. These organic compounds are broken down into simpler molecules, such as glucose. As a result, cells extract energy from glucose over many chemical reactions—a process called cellular respiration.
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In biological systems, most metabolic pathways are interconnected. The cellular respiration processes that convert glucose to ATP—such as glycolysis, pyruvate oxidation, and the citric acid cycle—tie into those that break down other organic compounds. As a result, various foods—from apples to cheese to guacamole—end up as ATP. In addition to carbohydrates, food also contains proteins and lipids—such as cholesterol and fats. All of these organic compounds are used...
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Carbohydrate catabolism is a fundamental process in cellular metabolism that enables energy extraction from glucose through two primary pathways: cellular respiration and fermentation. Both pathways begin with glycolysis, which operates independently of oxygen availability.Glycolysis: A Shared Starting PointGlycolysis is an oxygen-independent process that breaks down glucose into two molecules of pyruvic acid. During this process, a net gain of two ATP molecules and two NADH molecules is...
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Pt/CNT Micro-Nanorobots Driven by Glucose Catalytic Decomposition.

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Researchers developed novel platinum (Pt) and carbon nanotube (CNT) micro-nanorobots. These biocompatible robots utilize glucose in body fluid as fuel for targeted medical applications.

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Area of Science:

  • Nanotechnology
  • Biomedical Engineering
  • Materials Science

Background:

  • Micro-nanorobots show promise for medical applications like targeted therapy and drug delivery.
  • Previous research primarily used pure water or hydrogen peroxide (H2O2) solutions for robot operation.
  • Operating micro-nanorobots in biological fluids presents unique challenges and opportunities.

Purpose of the Study:

  • To design and fabricate micro-nanorobots capable of operating using glucose as fuel in human body fluid.
  • To investigate the potential of platinum (Pt) and carbon nanotube (CNT) as anode and cathode materials for glucose-powered micro-nanorobots.
  • To assess the biocompatibility and motion characteristics of the fabricated micro-nanorobots.

Main Methods:

  • Developed Pt/CNT micro-nanorobot structures using template electrochemical and chemical vapor deposition.
  • Characterized the micro-nanorobot morphology using scanning electron microscopy (SEM) and transmission electron microscopy (TEM).
  • Analyzed elemental composition using energy-dispersive X-ray spectroscopy (EDX).
  • Calculated driving force based on experiments in glucose solution, Stoker's law, and Newton's second law.

Main Results:

  • Successfully fabricated Pt/CNT micro-nanorobot structures.
  • Confirmed the biocompatibility and motion capabilities of the micro-nanorobots in glucose solutions.
  • Demonstrated the feasibility of using glucose as a fuel source for micro-nanorobot propulsion.

Conclusions:

  • The Pt/CNT micro-nanorobot design is suitable for operation in glucose-containing biological fluids.
  • These micro-nanorobots possess the necessary biocompatibility and motion characteristics for potential medical applications.
  • This work paves the way for developing advanced micro-nanorobots powered by endogenous fuels.