A group of organisms of common ancestry having common characteristics, that are able to reproduce only among themselves to produce fertile offspring and which are usually geographically distinct. It constitutes the fundamental rank in the taxonomic hierarchy. (FAO Fisheries Department (2003) World Fisheries and Aquaculture Atlas. CD-ROM. Rome, FAO. 2nd ed.; Anonymous (1998) AQUALEX. Multilingual glossary of aquaculture terms / Glossaire multilingue relatif aux termes utilisés en aquaculture. CD ROM, John Wiley & Sons Ltd. & Praxis Publ., UK.)
Note
For taxonomic level species, see "species (taxa)" <c_331243>.
Specific Gravity (SG) is a special case of relative density. It is defined as the ratio of the density of a given substance, to the density of water (H2O). (Wikipedia. 2025. Specific gravity https://simple.wikipedia.org/wiki/Specific_gravity)
The ratio of the amount of heat required to raise the temperature of a substance 1 degree Celsius to the heat required to raise the temperature of an equal mass of water 1 degree Celsius. (http://agclass.nal.usda.gov/mtwdk.exe?k=default&l=60&w=44791&n=1&s=5&t=2)
Lixisols have a higher clay content in the subsoil than in the topsoil, as a result of pedogenetic processes (especially clay migration) leading to an argic subsoil horizon. Lixisols have low-activity clays in the argic horizon and a high base saturation in the 50–100 cm depth. Many Lixisols are included in Red yellow podzolic soils (e.g. Indonesia), Chromosols (Australia), Argissolos (Brazil), Sols ferralitiques faiblement desaturés appauvris (France) and Alfisols with low-activity clays (United States of America). (IUSS Working Group WRB. 2015. World Reference Base for Soil Resources 2014, update 2015 International soil classification system for naming soils and creating legends for soil maps. World Soil Resources Reports No. 106. FAO, Rome.)
Either of a pair of tubular structures formed by ductus deferens; arteries, veins, lymphatic vessels, and nerves. The spermatic cord extends from the deep inguinal ring through the inguinal canal to the testis in the scrotum. (MeSH, 2024. Spermatic Cord http://id.nlm.nih.gov/mesh/D013085)
A Living Lab is a user-centric innovation milieu built on every-day practice and research, with an approach that facilitates user influence in open and distributed innovation processes engaging all relevant partners in real-life contexts, aiming to create sustainable values. (Bergvall-Kåreborn, B., Eriksson, C. I., Ståhlbröst, A., & Svensson, J. (2009). A milieu for innovation: defining living labs. In ISPIM Innovation Symposium: 06/12/2009-09/12/2009. https://www.diva-portal.org/smash/get/diva2:1004774/FULLTEXT01.pdf)
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Living labs are open innovation ecosystems in real-life environments: physical or virtual spaces focused on co-creating and testing solutions in real-world settings with active involvement from end-users.
The process by which spermatogonia undergo meiosis, eventually resulting in the formation of spermatozoa. (FAO. 2008. Glossary of aquaculture. https://openknowledge.fao.org/handle/20.500.14283/a1555m)
The Spermatophyta, commonly called spermatophytes or seed plants, are a monophyletic lineage within the lignophytes. The major evolutionary novelty that unites this group is the seed. (Simpson, Michael. (2019). Evolution and Diversity of Woody and Seed Plants. 10.1016/B978-0-12-812628-8.50005-5.)
A spermatozoon or spermatozoön (plural spermatozoa) is a motile sperm cell, or moving form of the haploid cell that is the male gamete. (https://en.wikipedia.org/wiki/Spermatozoon)
