Neural Communication: Synaptic Transmission and cAMP Signaling
Synaptic Transmission: The Release Mechanism
The action potential signal arrives at the axon terminal (the bouton). The local depolarization causes voltage-gated Ca²⁺ channels to open. Calcium (Ca²⁺) enters the presynaptic cell because its concentration is greater outside the cell than inside.
The influx of Ca²⁺ triggers the release of neurotransmitters through the following steps:
- Ca²⁺ binds with calmodulin, causing vesicles filled with neurotransmitter to migrate toward the presynaptic
Sericulture and Silkworm Rearing: Production and Biology
Sericulture: Definition and Economic Importance
Sericulture is the rearing of silkworms for the production of silk. It is a farm-based, labor-intensive, and commercially profitable agro-industry that provides employment and income to rural people, especially women and small farmers.
Main Scopes and Benefits of Sericulture
- Employment Generation: Provides year-round jobs to farmers, reelers, weavers, and traders.
- Rural Development: Boosts the rural economy through cottage industries.
- Export Potential:
Transaction Cost Economics and Risk Management Principles
Transaction Cost Economics (TCE)
Transaction Cost Economics (Williamson) is a branch of economics that studies the solution to coordination and motivation problems using price and non-price mechanisms.
Core Principles of Williamson’s TCE
- i) It makes the transaction the basic unit of analysis.
- ii) Transactions differ in attributes that are relevant for the decision on how to govern them.
- iii) Contracts govern transactions, and the list of available contracts is much larger than the narrow view of pure
Gender Roles and Literary Symbolism in Short Fiction
Part 2: Gender and Symbolism
Both “The Yellow Wallpaper” by Charlotte Perkins Gilman and “Cat Person” by Kristen Roupenian explore how gender roles limit women’s freedom and self-expression. In both stories, symbolism helps the reader understand the emotional and social struggles women face.
In “The Yellow Wallpaper,” the narrator is a woman suffering from depression whose husband controls every part of her life. He decides what she does, what she reads, and even what she thinks. The
Read MoreCell Biology: Theory, Transport, and Structures
Cell Theory and Microscope Technology
1. Can cells appear spontaneously without genetic material from a previous cell?
No, cells do not appear spontaneously; they pass copies of their genetic material on to their daughter cells.
2. Compare and contrast a TEM and SEM.
In a TEM (Transmission Electron Microscope), electrons are transmitted through a specimen to a fluorescent screen. An SEM (Scanning Electron Microscope) is a modification that directs electrons over the surface of the specimen, producing
Read Moretgervfrs
6 STRATEGIC BUSINESS OBJETIVES for implementation are:
1. Operational excellence: improve efficiency, productivity and performance through automation and streamlined process. Walmart uses real-time inventory systems to reduce costs.
2. New products, services and business models: enable innovation and create new ways of delivering value. Apple → iTunes / Appstore innovation.
3. Customer and supplier intimacy: use systems to build stronger relationships, improve service and increase loyalty. Amazon
Operating System Concepts: Processes, Threads, and Scheduling
CH 3 – Processes
Definition:
Process = program in execution (active); program = passive file.
Process layout:
Text (code) | Data (globals) | Heap (dynamic alloc.) | Stack (function frames).
States:
new → ready → running → waiting → terminated.
PCB (Process Control Block):
state, PC, registers, priority, memory info, I/O status, accounting.
Schedulers:
Long-term (job) → admit to memory (degree of multiprogramming); Short-term (CPU) → choose next ready process; Medium-term → swap in/out
Workshop
We say that there is a surge when the nominal voltage of 220VAC, a certain percentage goes up and stays there for a certain period of time say that there are tensions Low Low voltage when the nominal value of 220 VAC, low a percentage and maintained at that value over a period of time peaks, transients and electrical noise or transient spikes appear in the power line for example when switched on or off electric motors. It appears as a very sudden surge of very high value during a tiny period of
Read MoreEssential English Grammar: Verbs, Modals, and Structures
The Verb “To Be” in the Past Simple: Was / Were
Affirmative and Negative Forms
| Subject | Affirmative | Negative |
|---|---|---|
| I | was | wasn’t |
| You | were | weren’t |
| He/She/It | was | wasn’t |
| We/You/They | were | weren’t |
Questions
Structure: Was/Were + Subject
- Was I?
- Were You?
- Was He/She/It?
- Were We/You/They?
Existential Sentences: There Was / There Were
| Form | Singular Example | Plural Example |
|---|---|---|
| Affirmative | There was a concert. | There were ten people. |
| Negative | There wasn’t a concert. | There weren’t any people. |
The Imperative Form
Affirmative Commands
- Make a fire!
- Help me!
Negative
Read MoreGeological Time Scale, Dating Methods, and Earth History
Geological Time Periods and Key Events
Paleozoic Era
- Cambrian: Marine invertebrates with external skeletons.
- Ordovician: First vertebrates appear.
- Silurian: First jawed fish; first land plants.
- Devonian: First amphibians.
- Carboniferous: Forests of giant ferns; first reptiles.
- Permian: Pangaea forms. The climate became very dry toward the end, leading to the greatest mass extinction event.
Mesozoic Era
- Triassic: First dinosaurs; first mammals.
- Jurassic: Gymnosperm plants dominate; first birds appear.
- Cretaceous: