A5101895987- Astronomical Observations and Instrumentation
- Cephalopods and Marine Biology
- Marine Biology and Environmental Chemistry
- Polymer Surface Interaction Studies
- Stellar, planetary, and galactic studies
- Mollusks and Parasites Studies
- Adhesion, Friction, and Surface Interactions
- Astronomy and Astrophysical Research
- Diatoms and Algae Research
- Photocathodes and Microchannel Plates
- Surgical Sutures and Adhesives
- Silk-based biomaterials and applications
- Insect and Arachnid Ecology and Behavior
- Astro and Planetary Science
- Environmental Toxicology and Ecotoxicology
- Marine Biology and Ecology Research
- Marine and coastal plant biology
- Hemostasis and retained surgical items
- Calcium Carbonate Crystallization and Inhibition
- Calibration and Measurement Techniques
- Hydrogels: synthesis, properties, applications
- Veterinary medicine and infectious diseases
- Entomopathogenic Microorganisms in Pest Control
- CCD and CMOS Imaging Sensors
- Plant-Derived Bioactive Compounds
Ithaca College
2011-2024
Observatoire Océanologique de Banyuls-sur-Mer
1996
Butler University
1994
University of North Carolina at Chapel Hill
1990-1992
University of Ottawa
1981
Over the duration of Kepler mission, KIC8462852 was observed to undergo irregularly shaped, aperiodic dips in flux up $\sim 20$\%. The dipping activity can last for between 5 and 80 days. We characterize object with high-resolution spectroscopy, spectral energy distribution fitting, radial velocity measurements, imaging, Fourier analyses light curve. determine that is a typical main-sequence F3 V star exhibits no significant IR excess, has very close interacting companions. In this paper, we...
The functional morphology of the suckers several benthic octopus species was studied using histology and cinematography. consist a tightly packed three-dimensional array musculature. Three major muscle orientations are found in wall sucker: (1) radial muscles that traverse wall; (2) circular oriented circumferentially around sucker, including minor sphincter muscle; (3) meridional perpendicular to muscles. connective tissue sucker includes inner outer fibrous layers an crossed fibers...
ABSTRACT The decrease in hydrostatic pressure generated by octopus suckers adhering to wettable and non-wettable surfaces was measured using a flush-mounted miniature transducer. cavitation thresholds, or lowest sustainable pressures, of sea water on the same were also compared with pressures octopuses. It is shown that can generate below 0MPa moderately surfaces. This disproves commonly repeated assumption cannot produce vacuum suggests importance suction attachment mechanisms may have been...
Many marine invertebrates form strong, temporary attachments using viscoelastic gels. To better understand these adhesives, an analysis of what is known gel structure and function was performed. There are different ways making gels, ranging from entangling giant glycoproteins to crosslinking smaller proteins. The mechanics the depend largely on size polymer, its concentration, whether it crosslinked. Compared gels such as mammalian mucus, adhesive mucous often appear more heavily relatively...
Several molluscs have been shown to alternate between a non-adhesive trail mucus and similar gel that forms strong glue. The major structural difference the two secretions is presence of specific proteins in adhesive mucus. present study identifies from glue slug Arion subfuscus land snail Helix aspersa. To investigate role played by these adhesion, were isolated different added commercial polymer solutions. effect was observed qualitatively, quantified using dynamic rheometer. triggered...
The composition of the adhesive form marsh periwinkle mucus was compared to trail used during locomotion. consists primarily large, carbohydrate-rich molecules with some relatively small proteins. In contrast, has 2.7 times as much protein no significant difference in carbohydrate concentration. resulting gel roughly equal amounts and carbohydrate. This substantial increase content is due additional presence two proteins molecular weights 41 36 kD. These are absent from mucus. Both...
Two factors determine the strength of pressure-based adhesive mechanisms such as suction: magnitude pressure differential that their musculature and mechanics can produce water sustain. This paper compares primary cephalopod sucker types: stalked suckers decapods (cuttlefish squid) unstalked octopods. These results are compared with physical limits imposed by cavitation, failure under negative pressure. The maximum differentials were measured using a wettable transducer or measuring force...
ABSTRACT Experiments were performed to determine the mechanism by which limpets attach substratum. Pressure measurements made under feet of three species as they forcibly detached from These show that actively decrease pressure their feet, and in almost every case this can account for all tenacity. The results are same whether transducer is flush with surface or connected via a tube. tenacity dependent on ambient pressure, predicted suction mechanism. Leaks disrupt attachment limpets. Thus,...
SUMMARY Several gastropod molluscs produce glues that are interesting because they dilute gels and yet strong adhesion. Specific glue proteins have been identified play a central role in this adhesion, possibly by crosslinking other polymers the gel. This study investigates of metals action these proteins. Atomic absorption spectrometry showed from slug Arion subfuscus contains substantial quantities zinc (46±7 p.p.m. 189±80 two different sets experiments) also iron, copper manganese (2–7...
view Abstract Citations (70) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Carbon Monoxide in the Interstellar Spectrum of Zeta Ophiuchi Smith, Andrew M. ; Stecher, Theodore P. monoxide has been detected interstellar absorption spectrum Ophiuchi. Equivalent widths are presented for eight transitions (A i fourth positive system Ci and four 13C160. A satisfactory fit to a curve growth can be obtained only when rotational states assumed...
The terrestrial slug Arion subfuscus produces a defensive secretion that is sticky and tough, despite being dilute gel. It unusual in having high stiffness for gel, yet retaining the extensibility typical of mucus. In tensile tests, it sustains an average peak stress 101 kPa, fails at strain 9.5. This gives gel toughness; requires much greater energy to fracture than most gels. toughness may arise from double-network type mechanism. this mechanism, two separate, interpenetrating networks...
Summary Metal ions are present in many different biological materials, and capable of forming strong cross-links aqueous environments. The relative contribution metal-based was measured the defensive glue produced by terrestrial slug Arion subfuscus. This contains calcium, zinc, manganese, iron copper. These metals essential to integrity gel stiffening. Removal all caused at least a fifteen-fold decrease storage modulus glue. Selectively disrupting involving hard Lewis acids such as calcium...
The tough, hydrogel glue produced by the slug Arion subfuscus achieves impressive performance through metal-based, protein cross-links. primary sequence of these proteins was determined transcriptome sequencing and proteome analysis tandem mass spectrometry. main that correlate with adhesive function are a group 11 small, highly abundant lectin-like proteins. These matched ligand-binding C-lectin, C1q or H-lectin domains. variety different their potential for oligomerization suggests they as...
The terrestrial slug Arion subfuscus secretes a glue that is dilute gel with remarkable adhesive and cohesive strength. function of this depends on metals, raising the possibility metal-catalyzed oxidation plays role. extent time course protein was measured by immunoblotting to detect resulting carbonyl groups. Several proteins, particularly one relative molecular mass (M(r)) 165 x 10³, were heavily oxidized. Of proteins known distinguish from non-adhesive mucus, only specific size variants...
Experimental measurements of water's ability to sustain negative pressures are reviewed with special emphasis on the relevance results xylem transport. Results vary over several orders magnitude and depend conditions testing. The greatest measured using heated, pressurized water or purified, degassed water. When more closely approximating those found in biological systems used, is considerably weaker. From these measurements, one can predict most likely range that be sustained xylem. This...
The slug Arion subfuscus produces a mucus-based defensive secretion that is remarkably tough. This glue appears to be double network hydrogel, gaining its toughness through the synergistic actions of two networks polymers, relatively stiff and deformable network. mechanism has great potential guide development synthetic adhesives. Mechanical tests were performed analyse key predictions mechanism. Stress relaxation tensile support presence stable cross-links. Cyclic stress–strain demonstrate...
The defensive mucus produced by the slug Arion subfuscus is tough and remarkably sticky. It spreads rapidly adheres strongly to a wide range of surfaces. adhesion equally strong on wettable (glass) non-wettable (plastic) appears depend group proteins that adsorb well different natural artificial Prominent among these were those distinguish adhesive secretion from non-adhesive mucus. not washed off non-ionic detergent. Similarly, glue as whole was affected this treatment. In contrast, high...
The role of metals in forming the primary cross-links slug glue was investigated. Several metal-binding proteins were identified defensive produced by Arion subfuscus . Notably, C-lectins that are unique to iron-binding proteins. This is unusual for C-lectins. Dissociating these from iron does not affect glue's stiffness. Similarly, several can bind zinc identified, but dissociating did weaken glue. These results suggest metal coordination involved this hydrogel stable provide stiffness more...