Journal Article nanotomography Zernike phase contrast full-field X-ray microscopy in situ experiments 059QF0KO0R Water X-ray microscopy adhesion biological specimen climate chamber denoising dual beam configuration fiber diffraction grating interferometry holography holotomography image quality in situ machine learning multibeams near-field holography near-field ptychography phase contrast phase contrast X-ray imaging phase retrieval relative humidity single-photon-counting detector small-angle X-ray scattering spider cuticle