Excitotoxin
发表于 2025-3-23 12:06:18
Reproduction and development in Cirratulidae (Annelida: Polychaeta), on living and preserved material. Most species are gonochoristic and spawn freely, but parthenogenesis (.) and hermaphroditism (., ., .,and perhaps .), sometimes with viviparity (., ., .(?) and .), occur in several genera. Some species of ., ., .,., ., and perhaps ., reproduce asexually by architom
飓风
发表于 2025-3-23 17:15:44
Divergence of reproductive and developmental characteristics in , (Polychaeta: Nereididae),small- and a large-egg form) are reviewed. General characteristics of the gamete ultrastructures of the two forms are very similar, though some minor differences were detected between them. The mode of reproduction, body size of mature adults, egg size, fecundity and mode of development are markedly
Celiac-Plexus
发表于 2025-3-23 20:35:46
Nereidid polychaetes as model organisms for marine chemical ecology,eromones attract the sexual partner and ensure the coordinated release of gametes by both sexual partners. In the current paper nereidids are used as model organisms to describe the chemical and behavioural basis of chemical communication in marine invertebrates. Structure-activity relationships can
dendrites
发表于 2025-3-24 01:17:19
Metabolite supply in oocytes of ,: role of nucleosides, freely in the coelomic fluid, which thus serves as the vehicle for the supply of substances required for oocyte growth. This overview focusses on the role of exogenous purine nucleosides for the growing oocytes. Eleocytes, a coelomic cell type which is proliferated in large amounts at the beginning
Judicious
发表于 2025-3-24 06:04:58
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鸵鸟
发表于 2025-3-24 07:57:06
Development of Perviata and Vestimentifera (Pogonophora),en reported from both groups, but further clarification is desirable. The perviates studied have large yolky eggs, incubated in the maternal tube to a ciliated settlement stage. Others with smaller eggs are still unstudied, but may have pelagic larvae. Vestimentiferans have small eggs and pelagic, n
黑豹
发表于 2025-3-24 12:22:39
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Agronomy
发表于 2025-3-24 18:05:16
Polychaete sperm: phylogenetic and functional considerations,nfuse functional associations between sperm morphology and reproductive mode with perceived phylogenetic patterns. Therefore, terms describing sperm based on function should be preferred. This terminology is designed to avoid any . judgement of phylogenetic pattern. The various modes of sperm packag
Hirsutism
发表于 2025-3-24 20:43:01
Sperm types and their use for a phylogenetic analysis of aquatic clitellates,the tail. With respect to the basic plan of a ‘modified’ sperm type, the clitellate spermatozoon is characterized by the presence of an acrosome tube containing to a variable extent the (withdrawn) acrosome vesicle, by the mitochondria being interposed between the nucleus and the tail, and by peculi
minion
发表于 2025-3-25 02:28:13
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