منابع مشابه
Efficiencies of ingestion and assimilation by an invertebrate predator using C and P dual isotope labeling
Daphnia rosea was uniformly labeled with both 14C and 33P, then offered as prey to Bvthotrephes cederstroemi Schoedler, a nonindigenous predatory cladoceran which has become established in the Laurentian Great Lakes. Both C and P from the prey were ingested with equal efficiency (58-59%, SE = 2%) by Bythotrephes and retained with equal efficiency over the next 12 h. Feeding behavior by the pred...
متن کاملProbable loss of chlorophyll-derived pigments during passage through the gut of zooplankton, and some of the consequences
By use of biogenic silica as an inert marker, it is shown that chlorophyll a and its derivatives can be destroyed or absorbed during passage through the gut of a herbivorous copepod. This observation is contradictory to the hypothesis that chlorophyll a is converted to pheophorbide a with 100% molar efficiency. The currently used equations for measuring chlorophyll and pheopigment by fluorescen...
متن کاملIndividual variability in diel vertical migration of a marine copepod: Why some individuals remain at depth when others migrate
The diel vertical migration (DVM) of the copepod Metridia paci jca was examined in Dabob Bay (47"45.0S1N. 122"49.7IfW). a fjord in Washington state. Although the population showed deep daytime residence (75175 m), a proportion of the population was found in the surface waters at night. For individuals that migrated to the surface, the mean size of the oil sac was much smaller than those that re...
متن کاملEffects of mitomycin C administered at various stages of pregnancy upon mouse fetuses.
Many cancer therapeutic agents have been used for experimental and clinical purposes. It has been established that generally such agents are toxic to embryos with highly mitotic activities as well as other rapidly growing or proliferating tissues. The teratogenicity of these agents has been shown in rodents (Reviewed by Nishimura, '64; Karnof sky, '65; Dagg, '66). Murphy et at. ('58) found that...
متن کاملEffect of gastric juice on iron absorption in patients with gastric atrophy.
The influence of gastric juice on iron absorption has been studied extensively in recent years. The absorption of haemoglobin iron is unaffected by achlorhydria (Biggs, Bannerman, and Callender, 1962) but inorganic iron is better absorbed in the presence of normal gastric juice (Goldberg, Lochhead, and Dagg, 1963; Cook, Brown, and Valberg, 1964). It has been shown that the administration of hyd...
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ژورنال
عنوان ژورنال: Encyclopédie berbère
سال: 1994
ISSN: 1015-7344,2262-7197
DOI: 10.4000/encyclopedieberbere.2357