The Sahara Desert has extreme temperature fluctuations from 29 degrees Celsius to -26 degrees Celsius and very low precipitation between 26% and 18%. Small insects are at the bottom of the food chain in the Sahara Desert ecosystem. The document discusses abiotic factors and the food chain of the Sahara Desert in a short report.
The document describes various techniques for developing and maintaining a medical pathology museum, including collecting, preparing, fixing, restoring, preserving, and presenting specimens. Specimens are fixed using the Kaiserling method to arrest decay and stabilize tissues. The museum exhibits specimens to teach students and is divided into sections like anatomy, histology, and current topics. Plastination allows specimens to be touched and preserved long-term. Proper cataloging and storage helps identify specimens for research and teaching.
This document provides information on methods for preserving biological specimens. It discusses the importance of specimen preservation for scientific study and outlines various preservation techniques. Key steps include killing/relaxing specimens, fixing them using preservatives like formalin or alcohol, and storing in bottles or jars long-term. The document also gives guidance on preserving different types of specimens, such as vertebrates, invertebrates, mollusks and arthropods. Proper labeling and handling of preservatives is emphasized.