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Saint Martin’s University Biology Journal

May 2006, Volume 1

difference in bacterial growth between acrylic nails and native nails. Table 1 shows the numbers of bacterial colonies found

when participant’s native and acrylic nails of both hands were swabbed while unwashed, and washed.

Native Nails

Acrylic nails

Native Nails

Acrylic Nails

120

2600

420

2460

1144

1500

1484

972

320

680

2348

2096

312

2248

2288

2880

1400

1336

164

3984

1360

292

2696

1184

784

376

3224

1112

3320

324

3120

1248

884

No participant

516

No participant

1164

No participant

1128

No participant

1080.8

1169.5

1738.8

1992

Table 1. Summary of data for the number of bacterial colonies found cultured on Petri plates that were incubated at 37°C for 24 hours, acrylic and native nails both hands, unwashed and washed. Each number refers to an individual participant. Means and standard deviations are also listed.

Unwashed

Washed

average

1080.8

average

1169.5

average

1738.8

average 1992

st. deviation

908

st. deviation

902

st. deviation

1148

st. deviation 1070

# of bacterial colonies

Native Nails

Acrylic nails

Native Nails

Acrylic Nails

(unwashed)

(unwashed)

(washed)

(washed)

3500

3000

2500

2000

1500

1000

500

0

Figure 1. The average number of bacterial colonies grown on a Petri dish for 24 hours at 37°C found on native nails and acrylic nails (unwashed and washed) on both hands. The number of participants in the native nails group was 10, and the number of participants for the acrylic nails group was 8. Each error bar represents one standard deviation about the mean. No significant difference was seen between the groups (F=1.66; d.f.=3; P=0.195).

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