Abstract: In electron microscopy, resolution is improved by using an atom or atom-array focuser, with the atom or atom array serving as an electrostatic lens at a focal plane of an electron beam probe having a beam size less than about 0.2 nm at the focal plane. An electrostatic lens can be included in ultra-high resolution microscopes wherein (i) in a linear atom array, the atoms are in alignment with the electron path, (ii) the distance between a sample and the electrostatic lens is adjustable, (iii) a two-dimensional focuser is used, (iv) a sample is at Fourier image distance from a two-dimensionally periodic focuser, (v) a two-dimensional detector or detector array is used, and/or (vi) the electron beam is scanned at the focal plane.

Abstract: The present invention relates to the art of agriculture. The method of sterilizing anthers of plants comprises treatment of the plants with a sterilizing agent in combination with a diluent during the period of the fifth and/or sixth stage of organogenesis. According to the invention, as the sterilizing agent use is made of derivatives of phosphoric acids of the general formula: ##STR1## wherein R is H, a C.sub.1 -C.sub.4 alkoxy, dimethylamine, wherein X is O, NH; B is H, a C.sub.1 -C.sub.4 alkyl, phenyl, D is H, CH.sub.3 ; A is a C.sub.1 -C.sub.4 alkyl, phenyl furyl; R' is OH, ONH.sub.4, OAlk(C.sub.1 -C.sub.4), phenyl; R.sup.2 is a C.sub.1 -C.sub.4 alkyl, NaNH.sub.4, NH.sub.3 Alk(C.sub.1 -C.sub.4), NH.sub.2 Alk.sub.2 (C.sub.1 -C.sub.4), or mixtures thereof. The method according to the present invention is useful in selection and seed production.