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450 results for “hook”
Robert Hooke's Microscope (1665)
Replica of Robert Hooke's microscope, which was used in his famous Micrographia (1665). The images he created dramatically increased interest in microscopy and visualization in the sciences. Vanderbilt University Digital Cultural Heritage. 3D Artist: Meghan Connor. More details at [https://olemolvig.dev/historyofsciencesimulations](http://olemolvig.dev/historyofsciencesimulations) Source: Objaverse 1.0 / Sketchfab
Wmid-d4d348 - Post Medieval hook
A complete copper alloy hook of probable Post Medieval dating (AD 1600 to AD 1800). The hook has a flat cross section. It has a circular suspension loop at the top, which extends into the hook. The hook curves back on itself at 180 degree angle. It terminates with a sharp point. For more information, please visit the online database record available at: https://finds.org.uk/database/artefacts/record/id/1072781 Source: Objaverse 1.0 / Sketchfab
Data from: Echinorhynchus salmonis Müller, 1784 (Acanthocephala: Echinorhynchidae) from the Bothnian Bay, Baltic Sea: morphological variability and radial asymmetry of proboscis hooks
Echinorhynchus salmonis is a common parasite of salmoniform and other fishes, occurring in fresh and brackish waters throughout the Holarctic. Presented here is the first analysis of the morphometric and meristic variation in a Palaearctic population of E. salmonis, collected from whitefish Coregonus lavaretus L. and smelt Osmerus eperlaus (L.) from the Bothnian Bay, northern Baltic Sea. Morphological data were compared with published descriptions of congeneric taxa. Nearctic populations of salmonid echinorhynchids considered by some to represent a distinct species, E. coregoni Linkins in Van Cleave, 1919, did not show any morphological divergence from Palaearctic populations, indicating that the name E. coregoni should be suppressed. Similarly, E. alpinus Linstow, 1901 has been considered to be a junior synonym of E. salmonis. However, E. alpinus should be regarded as a valid species, because it has a longer and more elongate body. The armature of the acanthocephalan proboscis typically displays radial symmetry. However, in E. salmonis the hooks on the dorsal surface of the proboscis are smaller than those on the ventral surface. Size differences between dorsal and ventral hooks are most pronounced at the base of the proboscis. The systematic and functional significance of radial asymmetry of proboscis hooks is discussed.
Data from: Grasping the shape of belemnoid arm hooks - a quantitative approach
Chitinous arm hooks (onychites) of belemnoid coleoid cephalopods are widely distributed in Mesozoic sediments. Due to their relative abundance and variable morphology compared with the single, bullet-shaped, belemnite rostrum, arm hooks came into the focus of micropaleontologists as a promising index fossil group for the Jurassic–Cretaceous rock record and have been the target of functional, ecological, and phylogenetic interpretations in the past. Based on three well-preserved arm crowns of the Toarcian diplobelid Chondroteuthis wunnenbergi, we analyzed the shape of a total of 87 micro-hooks. The arm crown of Chondroteuthis is unique in having uniserial rather than biserial hooks. The first application of elliptic Fourier shape analysis to the arm weapons of belemnoid coleoids allows for the distinction of four micro-hook morphotypes and the quantification of shape variation within these morphotypes. Based on the best-preserved arm crown, we reconstructed the distribution of morphotypes within the arm crown and along a single arm. Our quantitative data support former observations that smaller hooks were found close to the mouth and at the most distal arm parts, while the largest hooks were found in the central part of the arm crown. Furthermore, we found a distinct arm differentiation, as not every arm was equipped with the same hook morphotype. Here, we report the functional specialization of the belemnoid arm crown for the first time and speculate about the potential function of the four morphotypes based on comparisons with modern cephalopods. Our analyses suggest a highly adapted functional morphology and intra-individual distribution of belemnoid hooks serving distinct purposes mainly during prey capture.
FIGURES 25–26. Parapsyche spp., pupal hook plates. 25 in Parapsyche species (Trichoptera: Hydropsychidae: Arctopsychinae) of western North America
FIGURES 25–26. Parapsyche spp., pupal hook plates. 25, Parapsyche spinata Denning; 26, Parapsyche turbinata Schmid. Abbreviations: III–VII = abdominal terga III–VII; a = anterior; p = posterior.
FIGURES 23–24. Parapsyche spp., pupal hook plates. 23 in Parapsyche species (Trichoptera: Hydropsychidae: Arctopsychinae) of western North America
FIGURES 23–24. Parapsyche spp., pupal hook plates. 23, Parapsyche almota Ross; 24, Parapsyche elsis Milne; Abbreviations: III–VII = abdominal terga III–VII; a = anterior; p = posterior.
FIGURES 41–46. Haptoral structures Hamatopeduncularia bagre Hargis, 1955. 41. Dorsal anchor. 42. Ventral bar. 43. Hook. 44. Ventral anchor. 45–46. Dorsal bar. Figs. 42–44 in Monogenoidea (Polyonchoinea: Dactylogyridae) parasitizing the gills of marine catfish (Siluriformes: Ariidae) inhabiting the Atlantic Amazon Coast of Brazil
FIGURES 41–46. Haptoral structures Hamatopeduncularia bagre Hargis, 1955. 41. Dorsal anchor. 42. Ventral bar. 43. Hook. 44. Ventral anchor. 45–46. Dorsal bar. Figs. 42–44 scale of 25 µm; Figs. 41, 45–46 scale of 50 µm.
Ancient Stone Age Carved Bone Fish Hook
Ancient Stone Age Carved Bone Fish Hook Source: Objaverse 1.0 / Sketchfab
XFP-067 Bone Fish Hook, Sanak Island, Alaska.
Bone fish hook barb for composite fish hook. Sanak Island, Alaska. CAT# XFP-067-109 XFP-067 is a group of 27 depressions and pits in Finneys Cove, Sanak Island. The major portion of the site dates to about 500-200 BCE, with some occupation approximately 1300 BCE. These artifacts were scanned with either a Faro Edge Arm or a Minolta Vivid 9i. Processed in Geomagic or Polyworks. 4-8 photos were used for texture in ZBrush. The Sanak Island artifacts are presented as a result of the research conducted under grants NSF 0326584, NSF 0508101, NSF 1139266, NSF 1321411. H. Maschner, Principal Investigator. Original digitizing work done at the IVL at Id. St. Univ. Subsequent processing completed at Global Digital Heritage. Fieldwork and analysis done with the permission and collaboration of the Pauloff Harbor Tribe and the Sanak Corporation Source: Objaverse 1.0 / Sketchfab
XFP-121 Ivory fish hook barb, Sanak Island, Ak.
Ivory fish hook barb for a composite fish hook. Sanak Island, Alaska. CAT# XFP-121-13 XFP-121 is a late prehistoric to contact period site on the west side of Sanak Island. It is dominated by the classic nucleus-satellite house styles of the Alaska Peninsula and Unimak Island. 13 of the 75 depressions are large, communal houses. Two c14 dates are about 1450 -1650 CE. These artifacts were scanned with either a Faro Edge Arm or a Minolta Vivid 9i. Processed in Geomagic or Polyworks. 4-8 photos were used for texture in ZBrush. The Sanak Island artifacts are presented as a result of the research conducted under grants NSF 0326584, NSF 0508101, NSF 1139266, NSF 1321411. H. Maschner, Principal Investigator. Original digitizing work done at the IVL at Id. St. Univ. Subsequent processing completed at Global Digital Heritage. Fieldwork and analysis done with the permission and collaboration of the Pauloff Harbor Tribe and the Sanak Corporation Source: Objaverse 1.0 / Sketchfab
XFP-058-124 Fish Hook Barb, Sanak Island, Alaska
Fish Hook Barb, Sanak Island, Alaska. XFP-058-124 XFP-058 small site on the west shore of Pauloff Harbor, Sanak Island, Alaska. It is a heavily disturbed shell midden with a few small house depressions. It dates approximately 200 BCE to 50 CE. These artifacts were scanned with either a Faro Edge Arm or a Minolta Vivid 9i. Processed in Geomagic or Polyworks. 4-8 photos were used for texture in Geomagic Wrap. The Sanak Island artifacts are presented as a result of the research conducted under grants NSF 0326584, NSF 0508101, NSF 1139266, NSF 1321411. H. Maschner, Principal Investigator. Original digitizing work done at the IVL at Id. St. Univ. Subsequent processing completed at Global Digital Heritage. Fieldwork and analysis done with the permission and collaboration of the Pauloff Harbor Tribe and the Sanak Corporation Source: Objaverse 1.0 / Sketchfab
UNDERSTANDING HOOKE´S LAW: ELASTICITY OF PASTA
<p>Dataset for estimating the Young's modulus of spaghetti and their Yield Stress. Each column is labeled with the parameter measured and their units. The column highlighted in blue contains the Yield Stress data, as depicted in Figure 2b of the article. The columns highlighted in green represent the Young's modulus estimation for various cooking times, as depicted in Figure 2a of the article.</p>
FIGURE 3 in Impatiens glauca Hook. f. et Thomson-A little known Himalayan species with augmented description and a new spurless variety
FIGURE 3. Distribution of Impatiens glauca: 1––Rohtang Pass; 2––Barot (Kangra); 3––Jhuni (Kullu); 4––Rolla (Kullu); 5––Sarahan (Shimla); 6––Churdhar Wildlife Sanctuary; 7––Pindari glacier; 8––Dhauli; 9––Nagling Darma; 10––Sosa (Chaudans Valley); 11––Guinji (Gharhwal); 12––Porakya (Bajura); 13––Ratanata (Chakure Lekh); 14––Garjigoth (Dori Lekh); 15––Kilar (Chamba).
FIGURE 2 in Impatiens glauca Hook. f. et Thomson-A little known Himalayan species with augmented description and a new spurless variety
FIGURE 2. Impatiens glauca var. ecalcarata: A––Plant habit; B––Fruiting habit; C––Flower side view; I. glauca var. glauca: D––Plant with sterile/abortive inflorescences; E––Inflorescence with capsules & a flower; F––Flower showing bifid spur; G––Flower buds with bract; H––Flower side view A–C (I. glauca var. ecalcarata) photographs by Harsh Singh and D–H (I. glauca var. glauca) photographs by Ashutosh Sharma.
FIGURE 1 in Impatiens glauca Hook. f. et Thomson-A little known Himalayan species with augmented description and a new spurless variety
FIGURE 1. Impatiens glauca var. ecalcarata: A.; B––Flower side view; C.; D––Flower frontal view; E––Lower sepal; F––Lateral united petals; G––Dorsal petal; H.––Stamen; I––Capsule; J––Seed; K––Leaf dorsal view.
FIG. 13 in Partial redescriptions of three holothurians with "hook papillae" (Apodida Chiridotidae): Taeniogyrus japonicus (Marenzeller, 1882), T. dendyi (Mortensen 1925), Scoliorhapis theelii (Heding, 1928)
FIG. 13. Scoliodota theelii Heding, two syntypes of the Zoological Museum of University of Copenhagen (ZMUC). A–C, lateral views of the "♀" specimen of the ZMUC-HOL-220 (A); the "♂" specimen of the ZMUC-HOL-220 (B); enlarged photo of its anterior body surface (B') and calcareous ring of the "♂" specimen of the ZMUC-HOL-220 (C), anterior left, dorsal upper. D and E, microphotograph of skin containing ossicles in anterior dorsal side of the "♀" specimen of the ZMUC-HOL-220 (D); and the "♂" specimen of the ZMUC-HOL-220 (E). Abbreviations: ad, anterior dorsal; ca, calcareous ring; po, Polian vesicle; sh, sigmoid-hook ossicle; te, tentacles.
FIG. 12 in Partial redescriptions of three holothurians with "hook papillae" (Apodida Chiridotidae): Taeniogyrus japonicus (Marenzeller, 1882), T. dendyi (Mortensen 1925), Scoliorhapis theelii (Heding, 1928)
FIG. 12. Scoliodota dendyi (Mortensen) comb. nov., two syntypes deposited in the Zoological Museum of University of Copenhagen (ZMUC). A, B, ossicles from anterior dorsal body wall of the smallest specimen of the ZMUC-HOL-57 (A); and ossicles from anterior dorsal body wall and tentacle of the largest specimen of the ZMUC-HOL-58 (B). Abbreviations: ad, anterior dorsal; te, tentacle.
FIG. 14. Scoliodota theelii Heding, 1928 in Partial redescriptions of three holothurians with "hook papillae" (Apodida Chiridotidae): Taeniogyrus japonicus (Marenzeller, 1882), T. dendyi (Mortensen 1925), Scoliorhapis theelii (Heding, 1928)
FIG. 14. Scoliodota theelii Heding, 1928, two syntypes of the Zoological Museum of University of Copenhagen (ZMUC). A, B, ossicles from anterior dorsal body wall of the "♂" specimen of the ZMUC-HOL-220 (A); and ossicles from anterior dorsal body wall and tentacle of the "♀" specimen of the ZMUC-HOL-220 (B). Abbreviations: ad, anterior dorsal; te, tentacle.
FIG. 9 in Partial redescriptions of three holothurians with "hook papillae" (Apodida Chiridotidae): Taeniogyrus japonicus (Marenzeller, 1882), T. dendyi (Mortensen 1925), Scoliorhapis theelii (Heding, 1928)
FIG. 9. SEM images of the Sado form specimens of adult (A–E) and young (F, G) Scoliodota japonica (Marenzeller). A–E, SEM images of WMNH-INV-2019-319. Calcareous ring of right side, viewed from right side, anterior right, dorsal upper (A); ossicles of anterior ventral body wall (B); posterior ventral body wall (C); anterior dorsal body wall (D); and posterior dorsal body wall (E). F, G, SEM images of WMNH-INV-2020-22; anterior dorsal body wall (F); and posterior dorsal body wall (G).
FIG. 10 in Partial redescriptions of three holothurians with "hook papillae" (Apodida Chiridotidae): Taeniogyrus japonicus (Marenzeller, 1882), T. dendyi (Mortensen 1925), Scoliorhapis theelii (Heding, 1928)
FIG. 10. Microphotograph of Scoliorhapis dianthus Solis-Marin et al. preserved skin. The microphotograph was prepared based on a tissue sample taken from dorsal/central body part of the holotype.
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