In conclusion the present study has demonstrated the localization of 3 receptors for endocytosis in rat renal proximal tubule cells. The three receptors are located in the membranes of the vacuolar compartment involved in endocytosis in these cells and in addition in dense apical tubules responsible for membrane recycling in the proximal tubule.

An examination of roots of hybrid larch from a farm forestry site by scanning electron microscopy has revealed crystalline deposits encrusting mantle hyphae of the associated ectomycorrhizal fungus. Electron probe micro-analysis identified calcium in the crystals and X-ray diffraction showed them to be whewellite, the monohydrate form of calcium oxalate. The significance of the finding is discussed.

Differential distribution of some elements have been detected in the cortex and medulla of the camera type eye-lens in a fresh water fish, Notopterus sp., using energy dispersive X-ray spectroscopy. This unique pattern of elemental distribution explains the less understood mechanism by which the optical properties of different parts of the fish lens are altered continuously and differentially during growth. The study also suggests the possible optical roles of some elements in ocular refractive structures.