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Plankton long time remains in the bosom of the main bone and can be detected by microscopic examination of a scraping from the walls, forming named cavity.
In the study of the corpse, if it is assumed death by drowning, it is strongly prohibited to use tap water, as existing plankton may be included in the fabric of the bodies designated for special studies. A method for detection of plankton in the blood, parenchymatous organs, bone marrow of long tubular bones is quite complicated and consists in the following: liver, brain, kidney, bone marrow (should take about 200 grams) after grinding is placed in a flask and poured perhydrol, are boiling in concentrated sulfuric acid (in the salt with added glacial acetic), then treated with nitric acid. The last step to enlightenment again added a small amount of perhydrol. After these manipulations all organic integral part of fabrics are fully destroyed and only inorganic compounds, including silicon shells plankton. Clear the contents of the flask is subject to repeated the centrifugation. From the resulting sludge produced drugs on slides that are studied under a microscope. Found diatoms it is advisable to take a picture. Micrograph is a document confirming the reliability of the results of the conducted research. For the comparative study of the features found in the corpse of plankton it is necessary to investigate water, from which was derived the corpse.
Together with water from the lungs into the blood can get suspended in water grains, corn starch and other so-called pseudofunction.
In connection with that that in the left half of the heart the blood is diluted with water, its amount is more than in the right half, the freezing point of blood in the left and right halves of the heart will be different, depending on the method of cryoscope. The proposed research methods conductivity of blood of resistance of erythrocytes, refractometry , etc. All of these methods help with more objectivity to establish the fact of death from drowning.
Determination of the fact of death from drowning it is difficult in cases where the dead body is in a state of pronounced rotting in which all common signs drowning, are practically absent. In this case, the invaluable help is rendered by the use of laboratory tests for the detection of plankton.
Some features are observed when drowning in the sea water, which is hypertensive environment in relation to blood. This results in the output of plasma of blood in the alveoli, which leads to a rapid swelling of the lungs, with the subsequent acute pulmonary insufficiency. This form of drowning blood is not diluted, and, on the contrary, the increase of the coefficient of viscosity.
As a rule, there is no hemolysis of erythrocytes. Research bodies of the corpse for the detection of plankton almost always give a negative result.
Drowning is not in the water and other liquids, such as oil, usually easily determined by the nature of the liquid, and diagnostics of the causes of death, as a rule, do not present great difficulties.
The death of a person in the water can sometimes come not from drowning, and from other causes. This occurs in patients suffering from ischemic heart disease from ventricular fibrillation, in patients suffering from hypertensive disease of bleeding in the brain.
It was observed cases of sudden death in young healthy people jumping into the water after overheating in the sun.
In such cases are morphological features quickly actual death. The signs of drowning are not detected.
In the study corpses removed from the water, it is necessary to establish: whether there has come death in the water (from drowning or from other reasons) or thrown into the water already dead. Therefore differ: the signs of drowning (mentioned above) and characteristics of stay of the corpse in the water, which expressed the sharper, the more time the corpse was in the water, and can be found on the corpses of people who have died from drowning, and on the bodies of the dead from other causes and then trapped in the reservoirs.
As practice shows, when diving into the water upside down on a shallow place can cause cervical vertebrae fractures, accompanied by damage to the spinal cord. There quadriplegia, people can't swim and dies. In all cases, autopsy of the corpse, extracted from the water it is necessary to examine the cervical spine and spinal cord, which enables to establish the presence and typical for this mechanism drowning character of fracture.