Mid-late Instar
Mid-late Instar - Related Videos
08:44
The Utility of Stage-specific Mid-to-late Drosophila Follicle Isolation
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Cited by 12 •
2013
Stage-specific isolation of mid-to-late Drosophila follicles is useful for a variety of purposes. Such follicles develop in culture, which allows for genetic and/or pharmacologic manipulations to be coupled with in vitro development assays and live imaging. Additionally, follicles can be used for molecular studies, such as isolating mRNA and protein.
01:31
Ed through Mid-point Method
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2024
At point A, the price is $6 for 120 units. Moving to point B, the price increases to $9, resulting in a decrease in quantity demanded to 80 units. This translates to a 50 percent increase in price and a 33.33 percent decrease in quantity, leading to a price elasticity value of 33.33/50 or 0.67. Conversely, moving from point B to A, entails a 33.33 percent decline in price and a 50 percent increase in quantity. This yields a price elasticity of 50/33.33 or 1.5. This discrepancy arises from the...
07:36
Dissection of Imaginal Discs from 3rd Instar Drosophila Larvae
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Cited by 10 •
2007
This protocol demonstrates the dissection technique used for isolating imaginal discs from drosophila larvae at the 3rd instar stage. Methods for fixing the tissue after saying and removing the wing, leg, and eye discs are demonstrated directly on a microscope slide for subsequent visualization.
06:04
A Method for Evaluating Insecticide Efficacy against Bed Bug, Cimex lectularius, Eggs and First Instars
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Cited by 5 •
2017
Insecticide evaluations are often targeted against adult insects, rather than immature stages. Here, we present a protocol for evaluating insecticides against bed bug eggs with a comparison to the first nymphal bed bug stage. These protocols could be adjusted for other insects to evaluate insecticide efficacy in non-adult life stages.
08:15
Measuring Left Ventricular Pressure in Late Embryonic and Neonatal Mice
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Cited by 18 •
2012
Measuring left ventricular pressure (LV) in embryonic and neonatal mice is described. Pressure is measured by inserting a needle connected to a fluid-filled transducer into the LV under ultrasound guidance. Care must be taken to maintain normal cardiac function during the experimental protocol.
FAQs
Growth during a mid-late instar reflects coordinated changes rather than a single event. Cells and tissues enlarge while nutritional reserves build, and hormonal signals shift development toward ecdysis. These processes prepare the animal for shedding its existing cuticle; afterward, the newly exposed cuticle expands and hardens, allowing the next developmental form to be established.
Hormonal signals coordinate the transition from growth to preparation for ecdysis. They link tissue development and reserve accumulation with the events required to shed the old cuticle. This coordination matters because the animal must complete internal preparation before the new cuticle can expand and harden, producing an orderly transition into the next form.
The distinction marks a meaningful position within development between successive molts. Specimens in this portion have progressed beyond the earliest part of the stage and are approaching the next form, while still undergoing substantial growth. Recognizing that position helps researchers compare specimens at more consistent developmental points rather than treating an entire instar as uniform.
Researchers can classify specimens according to their developmental position between successive molts, using consistent criteria for identifying the middle-to-advanced portion of an instar. Consistent staging reduces ambiguity when specimens differ in developmental progress. It also supports comparisons of growth and development by ensuring that measurements or observations refer to comparable biological stages.
Selecting mid-late instars can provide a defined developmental window for studies of physiology, behavior, genetics, pest control, and environmental responses. The stage is useful when investigators need animals that have accumulated substantial growth and reserves but have not yet entered the next form. Such selection makes age-related comparisons and experimental interpretation more consistent.
Many insects and other arthropods pass through multiple larval or nymphal instars, so developmental timing must be described more precisely than by species or life-cycle labels alone. Identifying the mid-late portion helps researchers compare growth and development across specimens, choose appropriate ages for experiments, and relate physiological or behavioral findings to a defined developmental context.