Chapter 17: Identification of Urine, Sweat, Fecal Matter, and Vomitus

The basic structural and functional unit of the kidney.

It is formed by a network of capillaries and is surrounded by a Bowman’s capsule.

the first step in urine formation.

The preliminary form of urine, consists of water, salts glucose, and waste products such as urea.

The filtrate is then passed through the renal tubule where _____ occurs.

During the _______, water, glucose, nutrients, and ions such as sodium are reabsorbed back into the blood.

It is the last process of urine formation. It occurs at the distal and the collecting tubules of the nephron where ions ammonia, and certain metabolites are secreted from the blood into the lumen of the renal tubule to be eliminated in the urine.

An aqueous solution consisting largely of water and waste products.

The most abundant waste product in urine, resulting from the elimination of ammonia that is produced from the metabolic process of amino acids.

The _______ is simple and rapid and is the most commonly used presumptive assay for the forensic identification of urine stains.

In the ________, a portion of a stain (~1 cm2) is cut and is extracted with 1 mL of distilled water. The extraction is transferred onto a piece of filter paper and is allowed to dry.

The _____ is useful for locating urine stains on large pieces of evidence such as clothing and bedding.

The creatinine present in urine can be detected using the _____.

In this test, picric acid is used to convert creatinine, under alkaline conditions, to form creatinine picrate, which is a bright red product.

Also known as uromodulin, is the most abundant protein in urine, and accounts for 40% of the urine proteins.

A steroid hormone with a weak potency of testosterone.

A metabolic intermediate in the biosynthesis of the gonadal steroids. It also has a potential function as a steroid hormone.

A metabolite of testosterone.

Are distributed almost all over the body and are controlled by the sympathetic nervous system. It plays a role in regulating body temperature.

Are associated with hair follicles, are usually restricted to the underarm and genital areas and are controlled by emotional stress.

is potentially useful for the identification of sweat for forensic purposes, which is based largely on the profiles of lactate, lactic acid, urea, and single amino acids in urine.

Identified as a potential biomarker of human sweat. It belongs to a class of human antimicrobial peptides of the innate immune defense system and plays an important role in protecting epithelial barriers from infections.

The detection of dermcidin in sweat stains can be performed using _________ utilizing antibodies specific to human dermcidin.

Are a type of waste matter that is the direct result of food that has been processed by the digestive system.

These are generated from the degradation of heme and are excreted into feces.

In the ______, a sample is mixed with saturated zinc acetate in ethanol solution to form aurobilinoid–zinc chelation complex that emits a characteristic green fluorescence under ultraviolet light.

The ______ is a variation of the Schlesinger test. A sample is treated with a mercuric salt solution to yield a pink-colored compound. Further treatment with a zinc salt produces fluorescence.

The forceful expulsion of the contents of the stomach through the mouth. It is usually preceded by salivation, sweating, and the sensation of nausea.

is highly acidic and tends to be malodorous.

__________ are endopeptidases that cleave primarily on peptide bonds in the middle of the protein.

such as tryptophan, phenylalanine, and tyrosine, are the preferred targeted amino acids for the cleavage reaction by pepsins.

In the pepsin-proteolytic assay, _______ is used as a substrate for pepsin.