Use following sub. I tested it and found working.
Sub fBold()
Dim UsedCell, MyRange, srcIdentifier
UsedCell = Sheets("Sheet1").Cells(1, 1).SpecialCells(xlLastCell).Row
Set MyRange = Range("A1:A" & UsedCell)
For Each intCell In MyRange
If Not InStr(1, intCell.Value, ".") > 0 Then
intCell.Offset(0, 1).Font.Bold = True
End If
Next
End Sub
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solved How to recognize the Integer in a column using Excel VBA