char = D;code = 68
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char = e;code = 101
char = n;code = 110
char = ;code = 32
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char = e;code = 101
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char = x;code = 120
char = i;code = 105
char = d;code = 100
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char = e;code = 101
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char = s;code = 115
char = t;code = 116
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char = ";code = 34
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char = e;code = 101
char = e;code = 101
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char = ;code = 32
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char = i;code = 105
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char = y;code = 121
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = m;code = 109
char = s;code = 115
char = ?;code = 63
result sql = Does hydrogen peroxide exist "free" in biological systems?
Does hydrogen peroxide exist "free" in biological systems?
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char = o;code = 111
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char = e;code = 101
char = ;code = 32
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char = 2;code = 50
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char = e;code = 101
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char = ;code = 32
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char = c;code = 99
char = e;code = 101
char = l;code = 108
char = l;code = 108
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char = f;code = 102
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char = a;code = 97
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char = e;code = 101
char = r;code = 114
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char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
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char = i;code = 105
char = f;code = 102
char = f;code = 102
char = u;code = 117
char = s;code = 115
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char = n;code = 110
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char = r;code = 114
char = a;code = 97
char = n;code = 110
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char = e;code = 101
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char = s;code = 115
char = ;code = 32
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char = t;code = 116
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char = d;code = 100
char = e;code = 101
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char = H;code = 72
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char = 2;code = 50
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char = a;code = 97
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char = r;code = 114
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char = s;code = 115
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char = e;code = 101
char = d;code = 100
char = ;code = 32
char = s;code = 115
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char = a;code = 97
char = n;code = 110
char = e;code = 101
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char = s;code = 115
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char = ;code = 32
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char = b;code = 98
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char = n;code = 110
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char = g;code = 103
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char = m;code = 109
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char = o;code = 111
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char = r;code = 114
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char = e;code = 101
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char = c;code = 99
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char = m;code = 109
char = p;code = 112
char = o;code = 111
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char = n;code = 110
char = d;code = 100
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = i;code = 105
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char = c;code = 99
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char = u;code = 117
char = d;code = 100
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char = g;code = 103
char = ;code = 32
char = a;code = 97
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = o;code = 111
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char = d;code = 100
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = c;code = 99
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char = r;code = 114
char = b;code = 98
char = o;code = 111
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char = e;code = 101
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char = p;code = 112
char = r;code = 114
char = o;code = 111
char = t;code = 116
char = e;code = 101
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char = n;code = 110
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = n;code = 110
char = u;code = 117
char = c;code = 99
char = l;code = 108
char = e;code = 101
char = i;code = 105
char = c;code = 99
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char = a;code = 97
char = c;code = 99
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char = d;code = 100
char = ;code = 32
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char = a;code = 97
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char = e;code = 101
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = a;code = 97
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char = d;code = 100
char = ;code = 32
char = n;code = 110
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char = c;code = 99
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char = i;code = 105
char = d;code = 100
char = e;code = 101
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char = .;code = 46
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char = H;code = 72
char = y;code = 121
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char = r;code = 114
char = o;code = 111
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char = n;code = 110
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char = e;code = 101
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char = x;code = 120
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char = d;code = 100
char = e;code = 101
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char = d;code = 100
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = (;code = 40
char = H;code = 72
char = P;code = 80
char = A;code = 65
char = s;code = 115
char = );code = 41
char = ;code = 32
char = a;code = 97
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = d;code = 100
char = i;code = 105
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = s;code = 115
char = y;code = 121
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char = t;code = 116
char = h;code = 104
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char = s;code = 115
char = i;code = 105
char = z;code = 122
char = e;code = 101
char = d;code = 100
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char = e;code = 101
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char = .;code = 46
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char = c;code = 99
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char = s;code = 115
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char = a;code = 97
char = l;code = 108
char = l;code = 108
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char = n;code = 110
char = e;code = 101
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char = h;code = 104
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = i;code = 105
char = d;code = 100
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = (;code = 40
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char = i;code = 105
char = s;code = 115
char = );code = 41
char = -;code = 45
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char = 2;code = 50
char = O;code = 79
char = 2;code = 50
char = ;code = 32
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char = d;code = 100
char = u;code = 117
char = c;code = 99
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char = s;code = 115
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char = ;code = 32
char = a;code = 97
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char = d;code = 100
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char = 2;code = 50
char = O;code = 79
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char = A;code = 65
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char = u;code = 117
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char = f;code = 102
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char = t;code = 116
char = h;code = 104
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char = c;code = 99
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char = s;code = 115
char = e;code = 101
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char = o;code = 111
char = r;code = 114
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char = f;code = 102
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char = u;code = 117
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char = o;code = 111
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char = 2;code = 50
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char = P;code = 80
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char = O;code = 79
char = 2;code = 50
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char = m;code = 109
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char = i;code = 105
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char = e;code = 101
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char = t;code = 116
char = o;code = 111
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char = i;code = 105
char = c;code = 99
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char = ;code = 32
char = c;code = 99
char = l;code = 108
char = a;code = 97
char = s;code = 115
char = t;code = 116
char = o;code = 111
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = i;code = 105
char = c;code = 99
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char = e;code = 101
char = f;code = 102
char = f;code = 102
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = s;code = 115
char = ;code = 32
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char = f;code = 102
char = ;code = 32
char = H;code = 72
char = 2;code = 50
char = O;code = 79
char = 2;code = 50
char = .;code = 46
char = ;code = 32
char = G;code = 71
char = r;code = 114
char = o;code = 111
char = w;code = 119
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = i;code = 105
char = n;code = 110
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char = b;code = 98
char = i;code = 105
char = t;code = 116
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char = o;code = 111
char = n;code = 110
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char = ;code = 32
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char = p;code = 112
char = h;code = 104
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char = r;code = 114
char = i;code = 105
char = u;code = 117
char = m;code = 109
char = ;code = 32
char = L;code = 76
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char = 2;code = 50
char = ;code = 32
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char = y;code = 121
char = ;code = 32
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char = 2;code = 50
char = O;code = 79
char = 2;code = 50
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char = i;code = 105
char = s;code = 115
char = ;code = 32
char = e;code = 101
char = n;code = 110
char = h;code = 104
char = a;code = 97
char = n;code = 110
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char = d;code = 100
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char = y;code = 121
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char = e;code = 101
char = u;code = 117
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char = r;code = 114
char = a;code = 97
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char = ;code = 32
char = H;code = 72
char = P;code = 80
char = A;code = 65
char = s;code = 115
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char = b;code = 98
char = u;code = 117
char = t;code = 116
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = c;code = 99
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = H;code = 72
char = P;code = 80
char = A;code = 65
char = s;code = 115
char = .;code = 46
char = ;code = 32
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char = d;code = 100
char = d;code = 100
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = t;code = 116
char = a;code = 97
char = l;code = 108
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = 1;code = 49
char = ,;code = 44
char = ;code = 32
char = 1;code = 49
char = 0;code = 48
char = ,;code = 44
char = ;code = 32
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = 3;code = 51
char = 0;code = 48
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = f;code = 102
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = o;code = 111
char = c;code = 99
char = u;code = 117
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = S;code = 83
char = .;code = 46
char = ;code = 32
char = t;code = 116
char = y;code = 121
char = p;code = 112
char = h;code = 104
char = i;code = 105
char = m;code = 109
char = u;code = 117
char = r;code = 114
char = i;code = 105
char = u;code = 117
char = m;code = 109
char = ;code = 32
char = L;code = 76
char = T;code = 84
char = 2;code = 50
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = n;code = 110
char = e;code = 101
char = a;code = 97
char = r;code = 114
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = e;code = 101
char = l;code = 108
char = i;code = 105
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = p;code = 112
char = a;code = 97
char = r;code = 114
char = t;code = 116
char = i;code = 105
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = g;code = 103
char = r;code = 114
char = o;code = 111
char = w;code = 119
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = h;code = 104
char = i;code = 105
char = b;code = 98
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = H;code = 72
char = 2;code = 50
char = O;code = 79
char = 2;code = 50
char = ,;code = 44
char = ;code = 32
char = b;code = 98
char = u;code = 117
char = t;code = 116
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = n;code = 110
char = e;code = 101
char = u;code = 117
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = H;code = 72
char = P;code = 80
char = A;code = 65
char = ,;code = 44
char = ;code = 32
char = e;code = 101
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = c;code = 99
char = i;code = 105
char = a;code = 97
char = l;code = 108
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = H;code = 72
char = i;code = 105
char = s;code = 115
char = -;code = 45
char = H;code = 72
char = 2;code = 50
char = O;code = 79
char = 2;code = 50
char = ,;code = 44
char = ;code = 32
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = n;code = 110
char = s;code = 115
char = p;code = 112
char = o;code = 111
char = r;code = 114
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = H;code = 72
char = 2;code = 50
char = O;code = 79
char = 2;code = 50
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = e;code = 101
char = l;code = 108
char = l;code = 108
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = 1;code = 49
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = b;code = 98
char = o;code = 111
char = u;code = 117
char = t;code = 116
char = ;code = 32
char = 1;code = 49
char = 0;code = 48
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = p;code = 112
char = l;code = 108
char = e;code = 101
char = t;code = 116
char = e;code = 101
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = h;code = 104
char = i;code = 105
char = b;code = 98
char = i;code = 105
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = g;code = 103
char = r;code = 114
char = o;code = 111
char = w;code = 119
char = t;code = 116
char = h;code = 104
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = b;code = 98
char = i;code = 105
char = l;code = 108
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = H;code = 72
char = P;code = 80
char = A;code = 65
char = s;code = 115
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = c;code = 99
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = c;code = 99
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = p;code = 112
char = H;code = 72
char = ;code = 32
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = c;code = 99
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = t;code = 116
char = e;code = 101
char = m;code = 109
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = ,;code = 44
char = ;code = 32
char = w;code = 119
char = h;code = 104
char = i;code = 105
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = d;code = 100
char = d;code = 100
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = F;code = 70
char = e;code = 101
char = (;code = 40
char = I;code = 73
char = I;code = 73
char = );code = 41
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = e;code = 101
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = a;code = 97
char = b;code = 98
char = s;code = 115
char = e;code = 101
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = E;code = 69
char = D;code = 68
char = T;code = 84
char = A;code = 65
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = c;code = 99
char = e;code = 101
char = l;code = 108
char = e;code = 101
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = H;code = 72
char = 2;code = 50
char = O;code = 79
char = 2;code = 50
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = H;code = 72
char = P;code = 80
char = A;code = 65
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = p;code = 112
char = o;code = 111
char = s;code = 115
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = .;code = 46
char = ;code = 32
char = C;code = 67
char = a;code = 97
char = l;code = 108
char = c;code = 99
char = u;code = 117
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = d;code = 100
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = H;code = 72
char = 2;code = 50
char = O;code = 79
char = 2;code = 50
char = ;code = 32
char = h;code = 104
char = y;code = 121
char = d;code = 100
char = r;code = 114
char = o;code = 111
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = b;code = 98
char = o;code = 111
char = n;code = 110
char = d;code = 100
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = n;code = 110
char = u;code = 117
char = c;code = 99
char = l;code = 108
char = e;code = 101
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = i;code = 105
char = d;code = 100
char = -;code = 45
char = b;code = 98
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = a;code = 97
char = i;code = 105
char = r;code = 114
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = ;code = 32
char = a;code = 97
char = p;code = 112
char = p;code = 112
char = a;code = 97
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = b;code = 98
char = o;code = 111
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = e;code = 101
char = n;code = 110
char = e;code = 101
char = r;code = 114
char = g;code = 103
char = y;code = 121
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = b;code = 98
char = i;code = 105
char = l;code = 108
char = i;code = 105
char = z;code = 122
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = p;code = 112
char = a;code = 97
char = r;code = 114
char = a;code = 97
char = b;code = 98
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = r;code = 114
char = m;code = 109
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = h;code = 104
char = y;code = 121
char = d;code = 100
char = r;code = 114
char = o;code = 111
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = b;code = 98
char = o;code = 111
char = n;code = 110
char = d;code = 100
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = .;code = 46
char = <;code = 60
char = b;code = 98
char = r;code = 114
char = /;code = 47
char = >;code = 62
result sql = Hydrogen peroxide (H2O2) can diffuse far from the site of production to intracellular locations where biological effects may be greater. The diffusion range is extended by H2O2 carriers formed spontaneously by hydrogen bonding with monomeric and polymeric compounds, including amino and dicarboxylic acids, peptides, proteins, nucleic acid bases, and nucleosides. Hydrogen peroxide adducts (HPAs) are readily synthesized, e.g., crystalline histidine (His)-H2O2 adducts. An equilibrium exists between an adduct-forming compound and H2O2. The detection and relative stabilities of HPAs are measured by the degree of decomposition of H2O2 as influenced by test compounds in buffered solution competing with glucose or fructose for H2O2. The HPAs delay decomposition of H2O2 up to several hundredfold. The overall charge on an HPA, i.e., its ability to penetrate cell membranes, influences the cytotoxic and clastogenic effects of H2O2. Growth inhibition of Salmonella typhimurium LT2 by H2O2 is enhanced by neutral HPAs but decreased by anionic HPAs. Addition of catalase 1, 10, or 30 min after inoculation of S. typhimurium LT2 reduces or nearly eliminates partial growth inhibition by H2O2, but a neutral HPA, especially His-H2O2, transported H2O2 into the cells within 1 min, and in about 10 min completely inhibited growth. The stability of HPAs decreases with increasing pH or increasing temperature, while added Fe(II) in the presence and absence of EDTA accelerates H2O2 and HPA decomposition. Calculations indicate H2O2 hydrogen bonds with nucleic acid-base pairs with no apparent bond strain and energy stabilization comparable to normal hydrogen bonding.

Publication: Free Radic. Biol. Med. 1991 ;11(6)::545-55.
Publication Date: 1991
Study Author(s): Schubert, J;Wilmer, J W;
Institution: Department of Biochemistry, Michigan State University, East Lansing 48824-1319.
Shortcut link to this study:
Hydrogen peroxide (H2O2) can diffuse far from the site of production to intracellular locations where biological effects may be greater. The diffusion range is extended by H2O2 carriers formed spontaneously by hydrogen bonding with monomeric and polymeric compounds, including amino and dicarboxylic acids, peptides, proteins, nucleic acid bases, and nucleosides. Hydrogen peroxide adducts (HPAs) are readily synthesized, e.g., crystalline histidine (His)-H2O2 adducts. An equilibrium exists between an adduct-forming compound and H2O2. The detection and relative stabilities of HPAs are measured by the degree of decomposition of H2O2 as influenced by test compounds in buffered solution competing with glucose or fructose for H2O2. The HPAs delay decomposition of H2O2 up to several hundredfold. The overall charge on an HPA, i.e., its ability to penetrate cell membranes, influences the cytotoxic and clastogenic effects of H2O2. Growth inhibition of Salmonella typhimurium LT2 by H2O2 is enhanced by neutral HPAs but decreased by anionic HPAs. Addition of catalase 1, 10, or 30 min after inoculation of S. typhimurium LT2 reduces or nearly eliminates partial growth inhibition by H2O2, but a neutral HPA, especially His-H2O2, transported H2O2 into the cells within 1 min, and in about 10 min completely inhibited growth. The stability of HPAs decreases with increasing pH or increasing temperature, while added Fe(II) in the presence and absence of EDTA accelerates H2O2 and HPA decomposition. Calculations indicate H2O2 hydrogen bonds with nucleic acid-base pairs with no apparent bond strain and energy stabilization comparable to normal hydrogen bonding.
PMID: 1778501

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