![Polymers | Free Full-Text | A Review of Rigid Polymeric Cellular Foams and Their Greener Tannin-Based Alternatives Polymers | Free Full-Text | A Review of Rigid Polymeric Cellular Foams and Their Greener Tannin-Based Alternatives](https://pub.mdpi-res.com/polymers/polymers-14-03974/article_deploy/html/images/polymers-14-03974-g008.png?1663915457)
Polymers | Free Full-Text | A Review of Rigid Polymeric Cellular Foams and Their Greener Tannin-Based Alternatives
![Frontiers | Population Density, Reproduction Cycle and Nutritional Value of Sphaerechinus granularis (Echinodermata: Echinoidea) in an Oceanic Insular Ecosystem Frontiers | Population Density, Reproduction Cycle and Nutritional Value of Sphaerechinus granularis (Echinodermata: Echinoidea) in an Oceanic Insular Ecosystem](https://www.frontiersin.org/files/Articles/699942/fmars-08-699942-HTML/image_m/fmars-08-699942-g001.jpg)
Frontiers | Population Density, Reproduction Cycle and Nutritional Value of Sphaerechinus granularis (Echinodermata: Echinoidea) in an Oceanic Insular Ecosystem
![Catalysts | Free Full-Text | Methanation of CO2 over High Surface Nickel/Aluminates Compounds Prepared by a Self-Generated Carbon Template Catalysts | Free Full-Text | Methanation of CO2 over High Surface Nickel/Aluminates Compounds Prepared by a Self-Generated Carbon Template](https://www.mdpi.com/catalysts/catalysts-13-00142/article_deploy/html/images/catalysts-13-00142-g001-550.jpg)
Catalysts | Free Full-Text | Methanation of CO2 over High Surface Nickel/Aluminates Compounds Prepared by a Self-Generated Carbon Template
![Polymers | Free Full-Text | A Review of Rigid Polymeric Cellular Foams and Their Greener Tannin-Based Alternatives Polymers | Free Full-Text | A Review of Rigid Polymeric Cellular Foams and Their Greener Tannin-Based Alternatives](https://pub.mdpi-res.com/polymers/polymers-14-03974/article_deploy/html/images/polymers-14-03974-g001.png?1663915482)