officinalis' sole visual pigment, 492 nm), assuming that one of the grey shades would give a similar achromatic signal to the tested green. In the first experiment, we created 16 checkerboard substrates in which 16 grey shades (from white to black) were paired with one green shade (matched to the maximum absorption wavelength of S. We tested color perception based upon a robust behavioral response in which cuttlefish ( Sepia officinalis) respond to visual stimuli (a black and white checkerboard) with a quantifiable, neurally controlled motor response (a body pattern). Mäthger, Lydia M Barbosa, Alexandra Miner, Simon Hanlon, Roger T In conclusion, this study provides first evidence that an aquatic invertebrate, the cuttlefish, adopts a saccadic movement strategy depending on the behavioral context that could enhance the information gained from optic flow.Ĭolor blindness and contrast perception in cuttlefish ( Sepia officinalis) determined by a visual sensorimotor assay. In contrast, during jet propelled swimming, the separation between rotational and translational movements and thus probably distance estimation on the basis of the optic flow field is abolished in favor of high movement velocities. However, this separation only occurred during fin motion. They clearly separated rotations from translations in line with the saccadic movement strategy documented for animals inhabiting the terrestrial habitat as well as for the semiaquatic harbor seals before. Cuttlefish indeed performed short rotations, saccades, with rotational velocities up to 343°/s. In the subsequent analysis, the center of mass of the cuttlefish body was manually traced to gain thrust, slip, and yaw of the cuttlefish movements over time. To extend the knowledge on underwater optic flow perception and use, we filmed the movement pattern of six common cuttlefish ( Sepia officinalis) with a high speed camera in this study. Underwater, optic flow is a valuable source of information as it is in the terrestrial habitat, however, so far, it has gained only little attention. Most moving animals segregate their locomotion trajectories in short burst like rotations and prolonged translations, to enhance distance information from optic flow, as only translational, but not rotational optic flow holds distance information. Helmer, Desiree Geurten, Bart R H Dehnhardt, Guido Hanke, Frederike D Saccadic Movement Strategy in Common Cuttlefish ( Sepia officinalis). Based on the current findings on SIP, we have summarized four topics in this review, including: chemopreventive, antineoplastic, chemosensitive, and procoagulant and anticoagulant activities, which are correlative closely with the actions of anticancer agents on cancer patients, such as anticancer, toxicity and thrombogenesis, with the latter two actions being common causes of death in cancer cases exposed to chemotherapeutic agents. As a natural product playing a role in cancer treatment, SIP may be used as chemotherapeutic ancillary agent or functional food. Although SIP has been proved to be multifaceted, most of the reported evidence has illuminated its chemopreventive and antineoplastic activities. A Potential Adjuvant Agent of Chemotherapy: Sepia Ink Polysaccharidesĭirectory of Open Access Journals (Sweden)įull Text Available Sepia ink polysaccharide (SIP isolated from squid and cuttlefish ink is a kind of acid mucopolysaccharide that has been identified in three types of primary structures from squid (Illex argentinus and Ommastrephes bartrami, cuttlefish Sepiella maindroni, and cuttlefish Sepia esculenta ink.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |