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In 1978, Fred Hoyle proposed that interstellar comets carrying several viruses landed on Earth as part of the panspermia hypotheses. With respect to life, the origin of homochirality on Earth has been the greatest mystery because life cannot exist without molecular asymmetry. Many scientists have proposed several possible hypotheses to answer this long-standing L-D question. Previously, Martin Gardner raised the question about mirror symmetry and broken mirror symmetry in terms of the homochirality question in his monographs (1964 and 1990). Possible scenarios for the L-D issue can be categorized into (i) Earth and exoterrestrial origins, (ii) by-chance and necessity mechanisms, and (iii) mirror-symmetrical and non-mirror-symmetrical forces as physical and chemical origins. These scenarios should involve further great amplification mechanisms, enabling a pure L- or D-world.

supramolecular assembly --- weak neutral current --- homochiral and heterochiral aggregates --- vortex --- neutrinos --- Soai reaction --- Viedma ripening effect --- nucleus–molecular coupling --- absolute asymmetric synthesis --- circular dichroism --- enantiomer self-disproportionation --- magmatic flow --- metal-organic framework --- Z0 boson --- hidden chirality --- gravitation --- SDE --- etch figures --- replicators --- supramolecular chirality --- deracemization --- assemblies --- spin polarized electrons --- super-high-velocity impact --- homochirality --- chirogenesis --- heat capacity --- tunneling --- prebiotic --- Salam hypothesis --- tilt-chirality --- self-assembly --- racemic field --- triethylenediamine (DABCO) molecules --- environmental chirality --- bioorganic homochirality --- polymer --- enantioselective reaction --- two-fold helix --- origin of life --- biological homochirality --- parity violation in the weak interaction --- amino acids --- multi-point approximation --- magnetism --- C1- and C2-symmetric catalysts --- spin-polarized lepton --- lipid --- chiral field (memory) --- Wallach’s rule --- asymmetric autocatalysis --- plasma reactor --- circularly polarized photon --- asymmetric reaction --- racemate --- enantiomorphism --- symmetry breaking --- ?-strand --- chirality --- circularly polarized light --- circularly polarized luminescence --- autocatalysis --- amino acid handedness --- asymmetric synthesis --- precision measurement --- nepheline --- chiral separation --- parity violation --- achiral stationary phase --- genesis of life chirality --- high dimensional chirality

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This Special Issue is result of a call for papers of the Section Industrial Crystallization of MDPI’s scientific journal Crystals. It addresses scientists and engineers active in research and process & product development in life-science industries (e.g. pharmaceuticals, fine chemicals and biotechnology products) and bulk chemical applications (e.g. desalination) as well. The contributions comprise several fundamental and application-oriented facets of crystallization providing an overview of industrially relevant subjects in the field. Main issues cover phase equilibria and solid-state behavior of crystalline compounds, crystal shape and size and related measurement techniques. Melt and solution crystallization are considered specifically addressing contemporary aspects of continuous crystallization and process intensification.

Technology: general issues --- K-MER zeolite --- synthesis parameter --- morphology --- cyanoethylation of methanol --- catalyst --- multi-dendrite motion --- CA-LBM model --- dendritic growth --- natural convection --- numerical simulation --- melt crystallization --- freeze crystallization (FC) --- recycling --- ionic liquid (IL) --- solid–liquid equilibrium --- cellulose --- nanocrystals --- modification --- poly(butylene succinate) --- crystallization --- kinetics --- chirality --- deracemization --- preferential crystallization --- racemic conglomerate --- phase behavior --- polymorphism --- aryl glycerol ethers --- spherical BaTiO3 nanoparticle --- hydrothermal synthesis --- nanoscale TiO2 seed --- crystal growth --- dielectric property --- curcumin --- purification --- ternary mixture of curcuminoids --- reverse osmosis --- membrane fouling --- gypsum scaling --- fluorescent-tagged polyacrylate --- fluorescence --- scale inhibition mechanisms --- solvent effect --- crystal habit --- aspect ratio --- molecular dynamics (MD) --- surface structure --- amine --- biocatalysis --- enzyme --- process intensification --- enantioselective --- fluidized bed --- continuous --- chiral separation --- racemate resolution --- enantiomer --- asparagine monohydrate --- fine chemicals --- continuous crystallization --- crystal shape --- process design --- DTB crystallizer --- scale up --- L-serine --- L-alanine --- enantiomers --- isomorphic miscibility --- thermal expansion --- PXRD --- TRPXRD --- optical measurement techniques --- crystal size measurement --- inline probe --- crystal needles --- microcrystals --- microplate --- grid scanning --- in situ data collection --- n/a --- solid-liquid equilibrium

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This Special Issue is result of a call for papers of the Section Industrial Crystallization of MDPI’s scientific journal Crystals. It addresses scientists and engineers active in research and process & product development in life-science industries (e.g. pharmaceuticals, fine chemicals and biotechnology products) and bulk chemical applications (e.g. desalination) as well. The contributions comprise several fundamental and application-oriented facets of crystallization providing an overview of industrially relevant subjects in the field. Main issues cover phase equilibria and solid-state behavior of crystalline compounds, crystal shape and size and related measurement techniques. Melt and solution crystallization are considered specifically addressing contemporary aspects of continuous crystallization and process intensification.

K-MER zeolite --- synthesis parameter --- morphology --- cyanoethylation of methanol --- catalyst --- multi-dendrite motion --- CA-LBM model --- dendritic growth --- natural convection --- numerical simulation --- melt crystallization --- freeze crystallization (FC) --- recycling --- ionic liquid (IL) --- solid–liquid equilibrium --- cellulose --- nanocrystals --- modification --- poly(butylene succinate) --- crystallization --- kinetics --- chirality --- deracemization --- preferential crystallization --- racemic conglomerate --- phase behavior --- polymorphism --- aryl glycerol ethers --- spherical BaTiO3 nanoparticle --- hydrothermal synthesis --- nanoscale TiO2 seed --- crystal growth --- dielectric property --- curcumin --- purification --- ternary mixture of curcuminoids --- reverse osmosis --- membrane fouling --- gypsum scaling --- fluorescent-tagged polyacrylate --- fluorescence --- scale inhibition mechanisms --- solvent effect --- crystal habit --- aspect ratio --- molecular dynamics (MD) --- surface structure --- amine --- biocatalysis --- enzyme --- process intensification --- enantioselective --- fluidized bed --- continuous --- chiral separation --- racemate resolution --- enantiomer --- asparagine monohydrate --- fine chemicals --- continuous crystallization --- crystal shape --- process design --- DTB crystallizer --- scale up --- L-serine --- L-alanine --- enantiomers --- isomorphic miscibility --- thermal expansion --- PXRD --- TRPXRD --- optical measurement techniques --- crystal size measurement --- inline probe --- crystal needles --- microcrystals --- microplate --- grid scanning --- in situ data collection --- n/a --- solid-liquid equilibrium

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The book is dedicated to the work and achievements of Howard Flack. It combines articles which describe his own work and the advances he made in the field of crystallography, with original research articles which focus on aspects related to Howard Flack's interests.

Technology: general issues --- pyrazine-benzimidazole --- spin crossover --- iron(II) --- ligand field --- nephelauxetic --- arylsulfonates --- pyridinium salt formation --- single-phase solvent system --- sulfonate synthesis --- sulfonyl chlorides --- X-ray crystallography --- crystallography --- Howard Flack --- 2-bromo-3-methylbutyric acid --- 2-bromo-3-methylbutanoic acid --- 2-bromoisovaleric acid --- halogenated carboxylic acid --- hydrogen bonding --- chirality --- absolute configuration --- racemate --- crystal structure --- Flack parameter --- coordination chemistry --- MOFs --- twinning --- structure analysis --- hydroborate --- anions packing --- lanthanide trichloride complexes --- diphosphine dioxide --- coordination complexes --- X-ray structures --- stereoselectivity --- hydrogen-bonding --- complex ion --- disiloxanes --- intermolecular interactions --- Hirshfeld surface analysis --- molecular models --- silicon --- γ-(+)-decalactone --- in situ cryo-crystallization --- flavoring agent --- lactone --- vibrational circular dichroism --- solid–gas reaction --- chemisorption --- nitrosyl --- Flack test --- Erdmann’s anion --- bath salts --- street drugs --- cocaine --- methamphetamine --- methylone --- π–π interactions --- racemic mimics --- kryptoracemic crystallization --- hydrogen-bond propensity --- hydrogen-bond coordination --- supramolecular synthon --- hydrogen-bond energies --- Cambridge Structural Database --- molecular electrostatic potential --- pyrazoles --- Rifamycin O --- ansamysin --- antibacterial --- semi-synthesis --- Alder-Ene --- conformation --- zwitterionic --- n/a --- solid-gas reaction --- Erdmann's anion --- π-π interactions