Ipaliwanag sa Tagalog at magbigay ng halimbawa
instrument known as Spectroscope, an optical instrument for forming and examining spectra.
Procedure: Dissolved bloodstain in water or saline solution. Place in small chamber iglass) with parallel sides so arranged that the rays of light will pass directly through it. The chamber is placed in the spectroscope and the instrument is so adjusted that the spectrum is clearly visible.
Positive Result: Upon absorbing some of the rays from the spectrum, it produced characteristic dark colored bands, which vary with the type of blood pigment. Example: oxyhemoglobin is marked by two bands, hemoglobin-broad band. carboxyhemoglobin its spectrum similar to oxyhemoglobin.
PRINCIPLE INVOLVED IN THE SPECTROSCOPIC TEST: The absorption properties of translucent colored fluids can be observed on the solar spectrum.
III.THE PRECIPITIN TEST FOR BLOOD
The precipitin test is the standard test used to determine whether the stain/blood is of human or animal origin: The precipitin test is very sensitive and requires only a small amount of blood for testing. Human bloodstain dried for as long to 10 to 15 years and longer may still give a positive precipitin reaction. Even extracts of tissues from mummies four to five years old have given positive reaction with the test. Experience has shown that human bloodstain diluted by washing in water and left with only a faint color may still yield a positive precipitin reaction.
Reagent: Precipitin/antiserum
Procedure: Scrape off bloodstain if on hard material. Powder the scrapings and extract with saline solution. If the stain is cloth, paper or similar material, cut a small portion and then place in a test tube and add extract with saline solution. Allow mixture to stand overnight. Centrifuge to clean the solution. Dilute with saline solution. Layer an antiserum/precipitin in a capillary tube.
extract of the bloodstain on top of the human
Positive ResultResul
1. Development of a white cloudy line at the contact point of the fluids that appears immediately or within one or two minutes.
instrument known as Spectroscope, an optical instrument for forming and examining spectra.
Procedure: Dissolved bloodstain in water or saline solution. Place in small chamber iglass) with parallel sides so arranged that the rays of light will pass directly through it. The chamber is placed in the spectroscope and the instrument is so adjusted that the spectrum is clearly visible.
Positive Result: Upon absorbing some of the rays from the spectrum, it produced characteristic dark colored bands, which vary with the type of blood pigment. Example: oxyhemoglobin is marked by two bands, hemoglobin-broad band. carboxyhemoglobin its spectrum similar to oxyhemoglobin.
PRINCIPLE INVOLVED IN THE SPECTROSCOPIC TEST: The absorption properties of translucent colored fluids can be observed on the solar spectrum.
III.THE PRECIPITIN TEST FOR BLOOD
The precipitin test is the standard test used to determine whether the stain/blood is of human or animal origin: The precipitin test is very sensitive and requires only a small amount of blood for testing. Human bloodstain dried for as long to 10 to 15 years and longer may still give a positive precipitin reaction. Even extracts of tissues from mummies four to five years old have given positive reaction with the test. Experience has shown that human bloodstain diluted by washing in water and left with only a faint color may still yield a positive precipitin reaction.
Reagent: Precipitin/antiserum
Procedure: Scrape off bloodstain if on hard material. Powder the scrapings and extract with saline solution. If the stain is cloth, paper or similar material, cut a small portion and then place in a test tube and add extract with saline solution. Allow mixture to stand overnight. Centrifuge to clean the solution. Dilute with saline solution. Layer an antiserum/precipitin in a capillary tube.
extract of the bloodstain on top of the human
Positive ResultResul
1. Development of a white cloudy line at the contact point of the fluids that appears immediately or within one or two minutes.