1953 · Rosalind E. Franklin; R. G. Gosling
Molecular Configuration in Sodium Thymonucleate
What this work is
Franklin and Gosling's 1953 letter in Nature on X-ray photographs of DNA fibers from calf thymus. They read the pattern of spots as a helix and conclude the fibers hold two chains wound around one axis, with the phosphate groups on the outside. It appeared in the same issue as Watson and Crick's model.
Then and now
Franklin and Gosling read X-ray spots from DNA fibers as a helix with two chains. Their photograph became the key evidence for the double helix that genomics treats as the code of life. Their film showed spots, not a code, and nobody has seen one.
Verdict
UNSCIENTIFIC
Neither the paradigm nor the work inside it passes. The verdict is unscientific.
1·This work · inside the paradigm
UNSCIENTIFIC
Does not follow the scientific method within Genomics / DNA Model.
2·Paradigm · Genomics / DNA Model
UNSCIENTIFIC
Fails the tests. The worse layer decides.
How the verdict is decided
The verdict grades both layers: the paradigm this work assumes, and how the work was carried out inside it. Both must be scientific for the whole thing to be scientific. A clean method inside an unscientific paradigm is unscientific. An unscientific method inside a better paradigm is unscientific. A split on either layer is mixed. The worse layer decides.
1·This work
Did this work test its claim with methods that are independent, falsifiable, and non-circular?
UNSCIENTIFIC
This work claims that fibers drawn from calf thymus form a helix of two co-axial chains with the phosphate groups on the outside and ten units per turn. All three tests fail.
Independently Verifiable
Fail
The X-ray beam left dark spots on film, and the helix of phosphate groups exists only as the reading the authors gave those spots with equations written for helices.
Falsifiable
Fail
When the spots did not match what their helix formula predicted, the paper said unspecified inner helices had shifted them, so no photograph could have counted against the helix.
Non-Circular
Fail
They adopted the hypothesis of a helix to compute the helix's dimensions from the photograph, then reported the computed helix as what the photograph showed.
Why
The film shows spots, and the helix exists only in equations written for helices. Spots that did not fit were said to be shifted by unseen inner helices, so no photograph could count against the helix. A helix was assumed in order to compute the helix's dimensions, and the computed helix was reported as what the photograph showed.
2·Paradigm · Genomics / DNA Model
Does the framework this work assumes pass the three tests?
UNSCIENTIFIC
Independently Verifiable
Fail
Every instrument in this field ends in a signal the model must read: spots on film become a double helix, flashes of light become a code, and nobody has watched a gene do anything.
Falsifiable
Fail
When the predicted coding did not appear, the field kept the model and renamed the leftovers junk DNA, missing heritability, and epigenetics, so no result could end it.
Non-Circular
Fail
The reading tools are built from the entity they confirm: transforms written for helices prove helices, and probes built from assembled sequences prove the sequences.
Why
The framework says the substance extracted from thymus glands is a molecule that stores heredity as a code. In this work the physical events were real: fibers, water, X-ray beams, spots on film. The helix, the phosphate backbone, the ten units per turn are readings supplied by equations written for helices and by a chemistry that had already decided what the fiber contains. Since 1953 the field has never put the entity itself at risk. Stretches that coded for nothing became junk DNA. Inherited variation that did not appear became missing heritability and epigenetics. The instruments that read the code were built from the code's own assembled sequences. Nobody has observed the code doing the inheriting. They observe signals, and the model names them.
From the work
If we adopt the hypothesis of a helical structure, it is immediately possible, from the X-ray diagram of structure B, to make certain deductions as to the nature and dimensions of the helix.
While the X-ray evidence cannot, at present, be taken as direct proof that the structure is helical, other considerations discussed below make the existence of a helical structure highly probable.
This lack of agreement is, however, to be expected, for we know that the helix so far considered can only be the most important member of a series of coaxial helices of different radii
we must conclude that a crystallographically important part of the molecule lies on a helix of this diameter. This can only be the phosphate groups or phosphorus atoms.