Height Of Blood Drop Lab

There are four blood types found in humans. These are A blood type which has the genotype either AA or AO, B blood type which has the genotype either BB or BO, AB blood type which has the genotype AB, and O blood type which has the genotype OO. These genotypes show a combination of complete dominance and codominance. A and B traits are dominant to the recessive O trait, however, the A trait is codominant to the B trait. Each blood type codes for certain antigens. A blood codes for the A surface antigen, B blood codes for the B surface antigen, AB blood codes for both the A and B surface antigen, and O blood does not code for a surface antigen. Therefore to determine one’s blood type a test can be performed

This unit is aimed at health and social care professionals involved in the use of

As I said about there are many forms of blood splatter patterns for example a single blood drop. Depending on the distance the blood drop as fallen from, it can be a little small drop to a more splattered expanded out drop. When a blood drop is affected by something other than force, it can change the characteristics of the blood drop splatter. Blood in flight is caused by a different source than gravity for instance a gun, or a heavy object. When you get shot blood splatters from the exit wound at a fast pace due to the velocity of the bullet. The direction the bullet went in can change the blood splatter characteristics and the distance it was shot at. A blunt heavy item can also cause blood splatter similar to a gun shot.

294). This means even after a week the blood has been cleaned up, luminol can still detect it. Also after applying luminol, the area needs to be darkened so that blue glow can be emitted. “The iron from the hemoglobin in the blood causes luminol to glow, so a blue glow is produced when the solution is sprayed where there is blood. Only a tiny amount of iron is required to catalyze the reaction” (Helmenstine, 2012). The use of luminol revealed that there were blood stains on the bed sheets and suspected that the woman was killed in her bedroom and that she did not go to work that day or leave the house.

On the other hand blood spatter on a rough surface creates a blood stain with japed edges. Also Blood strains spread more in softer surfaces. Blood usually makes a spherical shape after separating from the blood source, this shape caused by the surface tension of the blood. The blood drop to pull itself in; both horizontally and vertically due to its surface tension, and will maintain its shape until it collides with something. Blood usually will not break unless acted on by a force, and the force has to be great enough to overcome surface tension. When a drop of blood hits the floor at a 90 degree angle the spatter will be round. A low-velocity spatter will be dependent on height, when distance fallen increases the blood spatter will

Blood spatter analysts are a crucial part of a homicide investigation. They examine the blood stains left behind at a crime scene with the help of criminal investigators. They try to find a pattern or trail with the blood to figure out what happened at the crime scene. These blood patterns can show where the victim was hit, how they were hit, if they struggled, and what kind of weapon the killer used. They use many techniques to collect evidence that can be analyzed at the lab. Common techniques are measuring the diameter of the blood drop, measuring the spatter zone, and taking pictures. Many analysts try to act out the homicide scene to piece together the crime scene and figure out what happened. They also sketch out the scene to go along

A bachelor's degree in one of the physical sciences is typically necessary. Blood spatter analysts deal with various academic areas, such as physics, math, biology, and chemistry. Also, blood spatter analysts are expected to endure specific training. Regular teachings in blood examination have been established by the Global Organization of Blood Spatter Analysts (Roufa, ‘’How to be a Bloodstain Pattern Analyst’’). Besides the necessary blood spatter analysis program, other lessons and programs are accessible and highly suggested.

Once tests have determined the presence of blood, more will be completed in the lab to determine if the blood is animal or human. Other tests will determine the DNA, which can point the investigator to specific individuals. The completion of the actual splatter analysis is done by a forensic scientist who establishes the path of the blood and how it spread over the surface in question. The direction of movement can be determined by measuring the shape of the bloodstain on a surface. This will also show the approximate speed at which the blood contacted the surface, assists in distinguishing between the rapid movement of blood (produced by a gunshot, severing of a main artery), or slower movement of blood from a minor cut. The origination of blood can be determined by analyzing the size and location of the blood drops. A strong force of impact will cause the blood to break up into smaller drops. Blood splatter made up of larger drops with a path of smaller drops can show evidence about how the blood got there and where the blood came from. An experienced blood splatter expert relies on their eyes and their training in the final analysis, but will also use other tools such as specialized computer programs which can help in legal cases .

Blood samples from a volunteer within the group were used to conduct the experiment. The volunteer’s hands were thoroughly washed and an alcohol swab was applied to further sanitize the hands. To gather the blood samples needed, a lancet was properly placed on the forefinger and a firm pressure was applied, which activated the needle inside to

It is flung off the weapon or tool during and after the act as a result of centrifugal force. Cast-off spatter is often elliptical in shape which is why it is easily confused with arterial spurting (Sutton, 1998). However, it can also resemble a typical medium velocity droplet any time the blood hits a surface. For example, a blow to the top of the head with an over head strike or simply cast off forming from blood dripping off a weapon after use will result in a similar pattern to a medium or low velocity droplet. Smooth metallic weaponry used will generate a more profound pattern than a textured weapon. In other words an aluminum baseball bat will yield a greater amount of cast off blood than a wooden baseball bat.

The dependent variable in this experiment is the diffusion rate of blood spatter on every surface, measured in millimeters. The independent variable in this experiment is the different surfaces being tested on. The control is a spherical droplet, dropped at a perpendicular angle (90 degrees) creating a circular stain that is used to compare with the other trials. The constants in the experiment are height(3 ft, 90 degrees), amount of liquid

To understand how analysts interpret bloodstains, one must first understand the basic properties of blood. Blood contains both liquid (plasma and serum) and solids (red blood cells, white blood cells, platelets and proteins). Blood is in a liquid state when inside the body, and when it exits the body, it does so as a liquid. However, this liquid state does not last very long after the blood leaves the body. Except for people with hemophilia, blood will begin to clot within a few minutes, forming a dark, shiny gel-like substance that grows more solid as time

I was able to give the blood its runny look by going over it in white

Given that blood spatter analysis is an emergent field, with rapidly occurring developments have significant probative implications for the court system, this project will seek to examine the multi-faceted elements of blood spatter analysis to provide an overview of the field’s different dimensions. Focusing on technical developments, analytical interpretation and court relevance, the project will propose that blood spatter’s analysis as a mainstream element of the CSI toolkit results from the combination of physical sciences and analytical rigor which lies at its core. Beginning with questions of technical and physical science, the project will

Investigating haemoglobin (Hb) concentration in blood samples using the haemoglobincyanide method and in foetal haemoglobin samples