chemical methods such as iodine fuming‚ silver nitrate‚ or ninhydrin to locate latent prints on porous materials. When one of these chemicals comes into contact with the chemicals present in the fingerprint residue the print become visible. .Iodine fuming takes place in a fuming chamber. The process works by heating up solid crystal iodine which creates vapors that adhere to the oily residue of print‚ producing a brown colored print. One of the drawbacks of using iodine fuming is that the print
Premium Chemistry Chemical reaction Solvent
tested was what environment affects the mass of the potatoes the most. The independent variable is the environments used salt‚ water and iodine solution. The dependent variable is the mass of the potato after being exposed to the environment for 5 days. The control was a potato in no specific environment‚ meaning it is just sitting in air‚ no salt and no water/iodine solution. If the potato is exposed to a specific (hypotonic/hypertonic) environment then the mass will increase/decrease because the
Premium Water Potato Environment
The Identification of Bacillus Badius [pic] Hannah Melanchuk Dr. Robert Suran May 1 2013 Microbiology Abstract Over a three week time span I was able to successfully identify an unknown microorganism by combining the results of several tests. The first test was the Gram stain test which showed the microorganism was Gram positive and rod shaped. Using an Unknown Identification Flowchart‚ I proceeded to inoculate a Starch plate. In week 2‚ I
Premium Gram staining Bacteria Microbiology
dialysis bag as a model of the cell membrane. Our hypothesis was that the glucose will diffuse out of the membrane into the beaker filled with iodine solution. To demonstrate dialysis tubing we used water‚ starch and iodine. When starch and iodine react together they form a dark brown color. Materials Rubber band Dialysis bag Beaker Glucose solution Iodine solution Water‚ thread Methods Cut a piece of dialysis tubing that has been soaking in water approximately 40 cm (approx. 16 in) long
Premium Diffusion Starch Semipermeable membrane
BASIC MICROBIOLOGY SMS ASSIGNMENT 1 (LACTOPHENOL BLUE STAINING) NAME : 1) FARAH ANINI BINTI MD. SHAFI’I 2) FATIN NUR SYAHIRAH BINTI MOHD. HANAFI 3) NOR AZAH BINTI MAHIZAN 4) JOSHUA RAJ A/L ISIDORE SAKAYARAJ 5) CHAN POH SHIN MATRIX NO : 1) 012012051710 2) 012012051610 3) 012012051646 4) 012012051472 5) 012012111185 SEMESTER : 2 PROGRAMME : BACHELOR OF NUTRITION (BNT) LECTURER : MADAM SASIMALANI SARGUNNAM
Premium Fungus Biology
The trace mineral iodine found primarily in seafood‚ seaweed‚ plants grown in iodine-rich soil and iodized salt is essential for the production of thyroid hormones. Before the 1920s‚ it wasn’t unusual for people to develop hypothyroidism because they consumed too little of this mineral. But the addition of iodine to table salt has virtually eliminated this problem in the United States. In other parts of the world‚ however‚ as many as 200 million people may have iodine deficiencies. The World
Premium Writing Physician Nursing
Buffer solution … 4.5 to 8.8 I2Kl (grams iodine) Starch solution Enzyme (amylase) 80 degree Celsius water (HOT) Floating test rack Procedure: While controlling the amount of starch and the amount of buffer we use with a pH of 5.8‚ we want to investigate how changes in enzyme concentration affect reaction rates. First we put 500 ml of amylase from 0.2% solution (provided by Michael Bunch) into an experimental tube. We then put 3 drops of Iodine into a test plate (the color is brown). While
Premium PH Enzyme Starch
4 elements that had not been discovered yet and it contained the atomic mass of the elements. DISADVANTAGES: * When Dmitri put the elements in order of atomic mass‚ he had trouble getting iodine because iodine was similar properties to chlorine and bromine. But iodine had a low atomic mass. So iodine could not be in his rows. This caused Dmitri to break his own rule; he made for the periodic table. DISADVANTAGES: * When Dmitri put the elements in order of atomic mass‚ he had trouble getting
Premium Periodic table Atomic number Chemical element
occur because water is not a carbohydrate. Reaction by a negative control is evidence of contamination. 2. The color changes expected for positive test results are Benedict’s test: orange to brick red Tollen’s test: metallic silver Starch iodine test: blue-black 3. Identify each of the samples in Part 1 as monosaccharide‚ disaccharide or polysaccharide. Water = not a saccharide Glucose = monosaccharide Fructose = monosaccharide Galactose = monosaccharide Sucrose = disaccharide
Premium Glucose Disaccharide Carbohydrate
to each tube and heated both tubes together in the (~95°C) water bath for two minutes. Then‚ recorded the results in table 1. 2. Added a few drops of fresh solution A and B separately spaced on a white tile. On each solution‚ added 1-2 drops of iodine solution and mixed with pen cover. Recorded your observations in the table 1. 3. Pipetted 2 ml solution B into each of four boiling tubes. The tubes were labelled 1‚ 2‚ 3 and 4 respectively near mouth of tube. Labelled your group name. 4.
Premium Starch Enzyme Amylase