Evidence of the spread of bacteria

Item No. P4140200 | Type: Experiments

30 Minutes
45 Minutes
grades 10-13 , University
Teachers/Professors , Students
heavy
EUR 6,033.10
Content 1 piece
EUR 7,179.39 Incl. VAT

Principle

Microorganisms are ubiquitous, i.e. they are present everywhere around us. This fact can be proved by touching the objects that are to be examined in view of the presence of microorganisms against the sterile nutrient medium in a Petri dish and by incubating the plates afterwards. The easy working methods that are to be applied for this purpose are described based on the following examples.   

Benefits

  • Experiment teaches all essential work techniques of microbiology.
  • Complementary experiment available which uses these work techniques.

Tasks

  • Provide evidence concerning the presence of microorganisms
  1. in the air
  2. on objects of daily use
  3. on the skin
  4. on insects

Learning objectives

  • Disinfection
  • Nutrient agar
  • Sterility

Device name
Item No.
Quantity
Beakers, Boro, high form, various sizes | Volume: 600 ml
Item No. 46029-00
1
Tripod,ring d=140 mm, h=240 mm
Item No. 33302-00
1
Tweezers, l = 130 mm, straight, blunt
Item No. 64610-00
1
Wire gauze with ceramic, 160 x 160 mm
Item No. 33287-01
1
Universal oven, 32 liters, 230 V
Item No. 49559-93
1
Safety gas tubing, DVGW, sold by metre
Item No. 39281-10
1
Bunsen burner, natural gas,w.cock
Item No. 32167-05
1
Petri dishes, glass, various diameters | diameter: 100 mm
Item No. 64705-00
10
Graduated cylinders, Boro, various sizes | Volume: 100 ml
Item No. 36629-00
1
Microscopic slides, 50 pcs
Item No. 64691-00
1
Graduated pipettes, various sizes | Volume: 10 ml
Item No. 36600-00
1
Test tube rack, wood, for 6 tubes d= 22mm
Item No. MAU-20042200
1
Erlenmeyer flasks, Duran®, narrow neck, various sizes | Volume: 500 ml
Item No. 36121-00
2
Test tube, laboratory glass, various lengths | Length: 160 mm
Item No. 37656-10
1
Meat extract 10 g
Item No. 31521-03
1
Peptone,dry,from meat 50 g
Item No. 31708-05
1
Spatula, double blade, 150 mm
Item No. 33460-00
1
Glass rod,boro 3.3,l=300mm, d=7mm
Item No. 40485-05
1
Sterile stoppers f. id 15mm, 250
Item No. 39266-00
1
Sterile stoppers f. id 29mm, 100
Item No. 39267-00
1
Pipettor
Item No. 36592-00
1
Autoclave with insert
Item No. 04431-93
1
Heating + cooking hotplate,230V
Item No. 04025-93
1
pH test sticks 4.5-10, 100 sticks
Item No. 30301-04
1
Sodium hydroxide, pellets, 500 g
Item No. 30157-50
1
Water, distilled 5 l
Item No. 31246-81
1
Agar-agar, powdered 100 g
Item No. 31083-10
1
Ethyl alcohol, absolute 500 ml
Item No. 30008-50
1

Name
Filename
Filesize
Filetyp
(de) Versuchsbeschreibung
p4140200_de .pdf
Filesize 1.96 Mb
pdf
(en) Versuchsbeschreibung
p4140200_en .pdf
Filesize 1.92 Mb
pdf
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