​2. (a) प्रतिबल संकेन्द्रण (Stress Concentration) को परिभाषित कीजिये।
जब किसी घटक (component) की ज्यामिति में अचानक परिवर्तन होता है, जैसे कि होल (hole), नॉच (notch), या कंधे (shoulder), तो उसके आसपास के क्षेत्र में प्रतिबल (stress) का मान औसत

1. Um gato macho, castrado 11 anos é atendido com perda de peso – DIABETES MELITUS
2. Um cão, 18 meses, american bully, com alopecia -  RASPADO CUTÂNEO PROFUNDO
3. Cão, pug, apresenta olho quase fechado – TESTE DE FLUORESCEINA
4. Cão, Golden, 5 anos é atendido após episódios de convulsão – EPILEPSIA IDIOPÁTICA
5. Durante consulta, medicina preventiva, tutora leva filhote – FILHOTES DEVEM INICIAR PROTOCOLO VACINAL
6. Cão, Border Colie, 3 anos foi atendido após convulsões – A EPILEPSIA IDIOPÁTICA

## Amino Acids and Peptides
### 1. \alpha-Amino Acids: Structure and Classification
Amino acids are the fundamental building blocks of proteins. An **\alpha-amino acid** consists of a central \alpha-carbon atom bonded to four distinct groups: an amino group (-\text{NH}_2), a carboxylic acid group (-\text{COOH}), a hydrogen atom (-\text{H}), and a variable side chain (-\text{R}).
#### Classification based on R-group polarity:
 * **Non-polar / Hydrophobic:** Side chains are aliphatic hydrocarbons or

## Principle of Nuclear Magnetic Resonance (NMR)
Nuclear Magnetic Resonance (NMR) spectroscopy is a powerful analytical technique used to determine the molecular structure of organic compounds. It is based on the magnetic properties of certain atomic nuclei.
### 1. Nuclear Spin and Magnetic Moment
Nuclei with an odd atomic number or odd mass number (such as ^1\text{H}, ^{13}\text{C}, ^{19}\text{F}) possess a quantum mechanical property called **spin**. This spinning charge generates a tiny magnetic

## 4. Spectroscopic Parameters
### Integrated Absorption Coefficient
A simple peak maximum (\varepsilon_{max}) doesn't capture the entire probability of a transition because electronic bands are broadened by vibrations. Instead, we use the **integrated absorption coefficient**, which is the area under the absorption curve:

### Oscillator Strength (f)
Oscillator strength is a dimensionless quantity that compares the transition probability of a real molecule to a classical harmonically oscillating electron.

## 1. Metal Ions in Biological Systems::Metal ions are fundamental to life, making up roughly 3% of the human body's weight. They are not merely passive structural components; they act as catalysts, charge carriers, and structural stabilizers.
### Classification Based on Action and Abundance::Biological elements are broadly classified into four categories based on their physiological requirement and concentration in the body: * **Essential Elements:** Elements that are absolutely indispensable for

* **\text{K}^+ (Major Intracellular Cation):** Maintains intracellular fluid volume, regulates cardiac rhythm, stabilizes membrane potential, and acts as a cofactor for several metabolic enzymes (e.g., pyruvate kinase).
### 2. Calcium (\text{Ca}^{2+})
 * **Structural Role:** Major component of bones and teeth in the form of hydroxyapatite, \text{Ca}_{10}(\text{PO}_4)_6(\text{OH})_2.
 * **Signaling Role:** Acts as a universal second messenger in intracellular signaling pathways.
 * **Physiological