Synthetic Amps

Synthetic antimicrobial peptides (AMPs) are laboratory-designed or chemically produced molecules that mimic natural host-defense peptides and help control microbial growth. They typically interact with negatively charged microbial membranes, where electrostatic attraction promotes peptide binding, membrane permeabilization, and cell lysis; some also enter cells and disrupt essential intracellular processes. In biology, synthetic AMPs support studies of innate immunity, host–microbe interactions, and peptide structure–function relationships. Their tunable sequences and compositions can improve stability, selectivity, or activity against bacteria and other pathogens, making them useful candidates for antimicrobial development, biosensors, and strategies to address drug-resistant infections.

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JoVE Science Education - Engineering

Synthetic Biology

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2023

This video presents synthetic biology and its role in bioengineering. Synthetic biology refers to the methods used to genetically modify organisms in order to make them capable of producing large quantities of a product. This product could be a protein that the cell already makes or a new protein that has been encoded in a newly-inserted DNA sequence. Here, we discuss how an organism's genetic material is modified using transformation or transfection. Then, the process is shown in the...

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JoVE Core - Electrical Engineering
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Second-order Op Amp Circuits

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2024

Implementing second-order low-pass filters in audio systems is crucial in refining audio signals by eliminating undesirable high-frequency noise. These filters typically involve second-order op-amp circuits configured as voltage followers, encompassing two nodes with distinct storage elements. The analysis of such circuits follows a systematic approach, similar to the second-order RLC circuits. In practical scenarios, bulky inductors are rarely employed due to their size and weight. This means...

Cascaded Op Amps

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2026

Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series. In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...

Characteristics of Practical Op Amps

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2024

A difference amplifier, a crucial component in numerous electronic devices, ideally amplifies only the difference-mode signal, which is the difference between two input signals. However, in practical circuits, the output voltage depends on both the differential gain and the common-mode gain. The ratio of differential gain to the common-mode gain is defined as the common-mode rejection ratio (CMRR). This ratio quantifies the ability of operational amplifiers (op-amps) to reject common-mode...

Op Amp AC Circuits

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2024

Within an audio system, the filter circuit plays a pivotal role in processing the amplified audio signal from an amplifier. Its primary function is significantly attenuating signal components with lower frequencies, thereby shaping the audio output. This circuit's operations are examined, focusing on the fundamental filter configuration. This configuration involves an operational amplifier arranged in an inverting setup coupled with resistors (R1 and R2) and a capacitor (C1). When faced with a...

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