NOVELTY - Bio-nano power cell (BNPC) comprising a transition metal complex polymer (I) is new.    USE - The BNPC is useful for diagnosing or treating a disease in an animal and monitoring the level of an analyte (all claimed) in biological fluid such as blood, interstitial fluid, plasma, dermal fluid, sweat and tears, where the disease is cancer, autoimmune disease, genetic defects, CNS disorders, infectious diseases and cardiac disorders. The BNPC is useful: for e.g. radioimmunossays, electron microscopy, PCR, enzyme linked immunoadsorbent assays, NMR spectroscopy, contrast imaging, immunoscintography and delivering pesticides; as pesticides including herbicides, fungicides, insect repellents and attractants, antimicrobials, algaecides, anthelmintics, acaricides and insecticides or other toxins such as diphtheria toxin, gelonin, exotoxin A, abrin, modeccin or ricin; nerve stimulators for relief of chronic pain, stimulators for regrowth of bone or other tissue and drug-release valves or micro valves; in fuel cells (e.g. membranes and catalysts), energy storage (hydrogen, solid state lighting, thermal management for devices, light emitting diodes, displays, electronic inks, interlayer dielectric, photoresist, molecular electronics, telecom devices (waveguides), photonics, photographic materials and stealth enhancement of materials), electrical devices such as a pacemaker, fluid-flow control valve, such as a valve in a duct or in the urinary tract, electricity production from plants, trees and plant residues, chemical sensors, biosensors, electronic nose (array-based sensors), lab-on-a-chip, nano-encoding of materials for environmental tracking and source identification, amplification technology for environmental sensors, biocidal materials, environmental sensing, remediation, clean water (e.g. ion exchange), clean air (e.g. super absorbers) and catalysts; in environmental upgrading of fuels, coatings and surface modifiers (such as to provide scratch resistance, an antimicrobial surface, color changing, texture modifier, dirt resistant, water resistant), cleansers and lotions, cosmetics, pigments and dyes, UV absorbers, carriers of nutritionals, surfactants and functional additives without adding color; in improved binders, chemical catalysis, chemical separation materials, filtration systems, petrochemical processing (nanocatalysts), and toxic leak sensors; for in-vitro and ex-vivo diagnostics and therapies, protein resistant coatings for medical devices (e.g. in-vivo and ex-vivo) and chemotherapies for oncology; and in carried agricultural materials including scavenging agents such as chelants, chelated metal (whether or not they are radioactive) or any moieties capable of selectively scavenging therapeutic or diagnostic agents. No biological data given.    ADVANTAGE - The BNPC is biocompatible, and allows effective production of flash, intermittent, or continuous power by electrolyzing compounds in biological systems.    DETAILED DESCRIPTION - Bio-nano power cell (BNPC) comprising a transition metal complex polymer of formula ((M)-((L-RS)z-(Q)f((DP)b-(CM)x)z-(Q)f-(PB)c-(SF)y)t) (I) or ((M)k-((L-RS)z-(Q)f((DP)b-(CM)x)z-(Q)f-(SF)y)t) (Ia), is new.    (M) = Fe, Co, Ru, Os or V metal ion;    (L-RS) = a ligand or groups of ligands including monodentate, bidentate or tridentate ligands of formula (M(L1)(L2)(L3)(L4)(L5)(L6));    L1-L6 = (L), where the same or different ligand that is bound or associated with the metal (M) and is any organic or inorganic moiety that can associate with (M), provided that at least one (L) have at its end terminus a reactive site (RS);    (RS) = reactive site functionality on (L);    (Q) = a linker moiety having at least 2 reactive sites;    f = 0 or 1 to the number of (RS);    (DP) = dendritic polymer having the ability to react with (RS) and the number of generations, G, of (DP);    G = 1 to the de Gennes dense packing of the surface or nanoscale sterically induced stoichiometry (N-SIS) effects, where the surface groups on the (DP) are biocompatible or can react with biocompatible surface groups such that the entire BNPC is biocompatible;    b = 1 to at least the number of (L-RS) present;    (CM) = carried material;    x = 0-4000;    (SF) = surface functionality groups that can either react with or associate with an enzyme, analyte, biocompatible group, crosslinking group, or (CM), or be inert, provided that the entire BNPC is biocompatible or antibiofouling;    y = 1 to the total number of possible surface groups available;    z, c, t = 1-6, provided that when t is less than 6, then the other available sites on (M) are (L), H, F, Cl, Br, I, CN, SCN, OH, H2O, NH3, alkylamine, dialkylamine, trialkylamine, alkoxy, heterocyclic compounds or polymer backbones that do not have reactive sites, and provided that for at least one entity where t is 1 or more, then all z are at least 1; and    k = 2.    N.B. (RS) is disclosed.