Bone Cytology and Pathology: A Comprehensive Guide

Posted by on Nov 8, 2024 in Biology | 0 comments

General Features of Fine Needle Aspiration (FNA)

What is FNA?

FNA is a histological study performed using a fine-gauge needle to extract cells or fluid from a mass. The extracted material is then examined cytologically. This procedure can be guided by imaging techniques such as CT scans, ultrasounds, or X-rays.

Advantages of FNA

  • Simple technique
  • Few complications
  • Quick and inexpensive
  • Wide application for both palpable and non-palpable masses

Procedure

FNA should be performed by a pathologist or clinician

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Asexual & Sexual Reproduction: Cycles, Structures & Functions

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Asexual Reproduction vs. Sexual Reproduction

Asexual Reproduction

Origin: 3500 million years ago

Cell Division: Mitosis

Parents: 1 progenitor

Cell Type: Normal cells

Characteristics:

  • Simple and profitable reproduction
  • Genetically identical individuals
  • No recombination of genes or characters
  • Rapid growth in the number of individuals

Sexual Reproduction

Origin: 1500 million years ago

Cell Division: Meiosis

Parents: 2 (almost always)

Cell Type: Specialized cells

Characteristics:

  • Constructive and complex reproductive
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Lipids: Classification and Properties

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Saponifiable Lipids

Saponifiable lipids contain fatty acids, which are monocarboxylic acids that may or may not be unsaturated. When subjected to alkaline hydrolysis, they undergo saponification, forming soaps (salts of fatty acids). Examples include glycerides, waxes, phospholipids, and sphingolipids.

Unsaponifiable Lipids

Unsaponifiable lipids do not contain fatty acids and therefore do not undergo saponification reactions. This group includes terpenes, steroids, and prostaglandins.

Fatty Acids

These

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Introduction to Genetics and Lipid Metabolism

Posted by on Nov 7, 2024 in Biology | 0 comments

Lipid Anabolism

Lipid anabolism involves three main processes: the synthesis of fatty acids, glycerol, and triacylglycerols.

Fatty Acid Synthesis

Fatty acid synthesis occurs in the cytosol from acetyl-CoA. This process is connected to carbohydrate catabolism, β-oxidation, and amino acid catabolism. Acetyl-CoA serves as the initiator. The first step involves transferring acetyl-CoA to a 3-carbon activator, malonyl-CoA. The addition of a malonyl-CoA molecule results in a 4-carbon chain and releases

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Cell Biology: Membranes, Photosynthesis, Reproduction, and More

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Transport Across the Plasma Membrane

The plasma membrane selectively allows certain substances to pass through, depending on their size. Transport occurs through several mechanisms:

  • Diffusion: Movement of substances from an area of high concentration to an area of low concentration across a permeable membrane.
  • Osmosis: Movement of water across a semi-permeable membrane from a region of high water concentration to a region of low water concentration.
  • Active Transport: Molecules are transported from
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Plant Nutrition and Energy Processes

Posted by on Nov 7, 2024 in Biology | 0 comments

Part 1: Nutrition, Relationship, and Reproduction

Nutrition

Nutrition is the process of taking in matter and energy that the body needs to survive.

Relationship

Relationship refers to the abstraction of the information environment surrounding an organism and its use for survival.

Reproduction

Reproduction creates new life forms with similar characteristics to their parents.

Part 2: The Role of Nutrition

The role of nutrition in a living being is the integration and transformation of matter and energy to

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