Adaptations of Coleoptera to the marine environment. I. Observations on rove beetles (Staphylinidae) from sandy beaches

1988 ◽  
Vol 66 (11) ◽  
pp. 2464-2468 ◽  
Author(s):  
Werner Topp ◽  
Richard A. Ring
Keyword(s):  
Oxygen Consumption ◽  
Recovery Time ◽  
Seawater Temperature ◽  
Time Lag ◽  
Oxygen Depletion ◽  
Sandy Beaches ◽  
Considerable Time ◽  
Rove Beetles ◽  
Fine Grained ◽  
Time Required

The sandy beaches of British Columbia are inhabited by a small number (11 species) of indigenous Staphylinidae which live near the drift line in the mid to upper littoral zone. They prefer fine-grained sandy beaches and most species feed on other intertidal invertebrates. All species investigated survived submersion in seawater by becoming quiescent, thereby reducing their metabolic rate. Oxygen consumption in seawater was greatly reduced. On re-exposure to air, a large overshoot in oxygen consumption occurred (in Thinopinus pictus), signifying a prior oxygen debt. In Cafius canescens, Cafius seminitens, and Hadrotes crassus the time required to reach full recovery was directly related to the duration of submersion, with 50% mortality in the population when recovery time exceeded 25 min. At a seawater temperature of 10 °C, LT50 was reached at 12–16 h submersion and at 20 °C, after 6.5 h. In Thinopinus pictus, however, recovery time was independent of duration of submersion, although the mortality curves were almost the same as for the three previously mentioned species, with LT50 occurring at 13 h at 10 °C and 7–8.5 h at 20 °C. Bledius monstratus showed symptoms of oxygen depletion only after a considerable time lag. Experimental submersion of this beetle resulted in an LT50 of 18 h at 20 °C.

scholarly journals The Application of an Impedance-Passivity Controller in Haptic Stability Analysis

2021 ◽  
Vol 11 (4) ◽  
pp. 1618
Author(s):  
Ping-Nan Chen ◽  
Yung-Te Chen ◽  
Hsin Hsiu ◽  
Ruei-Jia Chen
Keyword(s):  
Control Systems ◽  
Force Feedback ◽  
Training System ◽  
Considerable Time ◽  
Virtual Training ◽  
Control Gain ◽  
Negative Damping ◽  
The Stability ◽  
Time Required ◽  
Stable Control

This paper proposes a passivity theorem on the basis of energy concepts to study the stability of force feedback in a virtual haptic system. An impedance-passivity controller (IPC) was designed from the two-port network perspective to improve the chief drawback of haptic systems, namely the considerable time required to reach stability if the equipment consumes energy slowly. The proposed IPC can be used to achieve stability through model parameter selection and to obtain control gain. In particular, haptic performance can be improved for extreme cases of high stiffness and negative damping. Furthermore, a virtual training system for one-degree-of-freedom sticking was developed to validate the experimental platform of our IPC. To ensure consistency in the experiment, we designed a specialized mechanical robot to replace human operation. Finally, compared with basic passivity control systems, our IPC could achieve stable control rapidly.

Seawater-temperature and UV-radiation interaction modifies oxygen consumption, digestive process and growth of an intertidal fish

2017 ◽  
Vol 129 ◽  
pp. 408-412 ◽  
Author(s):  
M. Roberto García-Huidobro ◽  
Marcela Aldana ◽  
Cristian Duarte ◽  
Cristóbal Galbán-Malagón ◽  
José Pulgar
Keyword(s):  
Oxygen Consumption ◽  
Uv Radiation ◽  
Seawater Temperature ◽  
Digestive Process ◽  
Intertidal Fish

A “Natural” Proposal for Addressing Climate Change

2014 ◽  
Vol 28 (3) ◽  
pp. 359-363 ◽  
Author(s):  
Thomas E. Lovejoy
Keyword(s):  
Climate Change ◽  
Greenhouse Gases ◽  
Ethical Issues ◽  
Time Lag ◽  
Radiant Heat ◽  
Time Frame ◽  
Future Generations ◽  
Considerable Time ◽  
Long Time

One of the fundamental challenges of climate change is that we contribute to it increment by increment, and experience it increment by increment after a considerable time lag. As a consequence, it is very difficult to see what we are doing to ourselves, to future generations, and to the living planet as a whole. There are monumental ethical issues involved, but they are obscured by the incremental nature of the process and the long time frame before reaching the concentration of greenhouse gases and the ensuing accumulation of radiant heat—and consequent climate change—that ensues.

Time lag and recovery time of neutral depopulation in compressed gases in a point-plane discharge

1990 ◽  
Vol 23 (5) ◽  
pp. 517-525 ◽  
Author(s):  
P Bayle ◽  
M Bayle ◽  
A Gibert ◽  
J Dupuy
Keyword(s):  
Recovery Time ◽  
Time Lag

Adaptations of Coleoptera to the marine environment. II. Observations on rove beetles (Staphylinidae) from rocky shores

1988 ◽  
Vol 66 (11) ◽  
pp. 2469-2474 ◽  
Author(s):  
Werner Topp ◽  
Richard A. Ring
Keyword(s):  
Oxygen Consumption ◽  
Spring Tide ◽  
Salinity Range ◽  
Laboratory Population ◽  
Rocky Shores ◽  
Temperature Dependent ◽  
Rove Beetles ◽  
Dry Conditions ◽  
Lethal Time ◽  
Rate Of Evaporation

Two common rove beetles inhabit the intertidal rocky shores of British Columbia: Liparocephalus cordicollis Le Conte and Diaulota densissima Casey. Liparocephalus cordicollis, the more abundant of the two, is a predator that feeds preferentially on small chironomid larvae. Adults and larvae of this species can withstand submergence in seawater at 10 °C for more than 2 weeks. Thus they are able to survive continuous inundation from one spring tide to the next, just above lowest tide levels. Adults of L. cordicollis are osmotic regulators and can stabilize their body weight at salinities varying from 2 to 45‰. Both of these staphylinid species respire above and below water. Oxygen consumption of L. cordicollis in air at 10 °C was 376 ± 59 μL O2∙g−1∙h−1, but when the beetles were immersed in seawater at the same temperature the respiration rate was reduced to 45 ± 8 μL O2∙g−1∙h−1. During submersion, temperature-dependent reactions were observed (Q10 = 2). Respiration was constant within the salinity range of 2–30‰, but at higher levels (45‰) oxygen consumption increased to 55 ± 5 μL∙g−1∙h−1. When L. cordicollis was exposed to warm, dry conditions (simulating low tide on a warm summer day) the rate of evaporation from the cuticle was very high, calculated at 175 μg H2O loss per cm2 body surface per hour per mm Hg saturation deficit. The LT50 (mean lethal time) for a laboratory population was 2.5 h at a vapor pressure deficit of 7 mm Hg. In the larvae of beetles of the two species, asynchrony of growth in the population occurs because submerged larvae stop feeding and growing. Consequently, the development of individuals living near the low tide line is protracted compared with that of individuals living in the midlittoral zone.

Vergil, the Confiscations, and Caesar's Tenth Legion

1981 ◽  
Vol 31 (2) ◽  
pp. 367-370 ◽  
Author(s):  
Lawrence Keppie
Keyword(s):  
Time Lag ◽  
Considerable Time ◽  
Land Settlement ◽  
Time Served ◽  
The Town

The relevance of the 1st and 9th Vergilian Eclogues to land settlement in Italy after Philippi has been discussed by many scholars. Questions such as the identity of Tityrus, Menalcas, and the youthfuldeusof Eclogue 1, and the eventual fate of the paternal farm, are the very stuff of Vergilian scholarship. It is possible to add an archaeological and epigraphic commentary on these events which may perhaps provide a more balanced framework for the continuing literary investigation of the poems.That Cremona was among the 18 prosperous cities selected before Philippi to be a reward for the time-served soldiery among the Triumviral legions is a clear and safe deduction from the Eclogues themselves. The decision to establish colonies was taken at Bononia in October 43, and colony commissioners were appointed at the same time (Dio 47. 14. 4). It is unlikely that they began work in earnest until the necessary victory had been won. These commissioners, sometimes and perhaps always with the titlepraefectus, acted as substitutes for the formaldeductores, the Triumvirs themselves. Thepraefectusfor Cremona is not directly attested.From the poems themselves and the scholiasts it might be thought that the arrival of the veterans to take possession was sudden and unannounced, adding to the shock felt by the owners (Ecl.9. 3–4; Serv.Proem.). In fact, the process of establishing a colony was carefully defined, and took considerable time. Firstly the commissioner, with a staff of surveyors and assistants, visited the town and set in motion the measurement of itsterritorium, the land on which the veterans would in due course be settled. Frequently the veterans expressed their dissatisfaction at the resulting time-lag (App. 3. 87; Plut.Ant.73; App. 5. 13 ff.).

Metabolic phenotype is not associated with vulnerability to angling in bluegill sunfish (Lepomis macrochirus)

2018 ◽  
Vol 96 (11) ◽  
pp. 1264-1271 ◽  
Author(s):  
Michael J. Louison ◽  
J.A. Stein ◽  
C.D. Suski
Keyword(s):  
Oxygen Consumption ◽  
Metabolic Rate ◽  
Recovery Time ◽  
Lepomis Macrochirus ◽  
Metabolic Phenotype ◽  
Intermittent Flow ◽  
Bluegill Sunfish ◽  
Metabolic Rates ◽  
Prior Work ◽  
Context Specific

Prior work has described a link between an individual’s metabolic rate and a willingness to take risks. One context in which high metabolic rates and risk-prone behaviors may prove to be maladaptive is in fish that strike fishing lures only to be captured by anglers. It has been shown that metabolic phenotype may be altered by angling; however, little work has assessed metabolic rate in fish and its relationship to angling vulnerability in a realistic angling trial. To address this, we subjected a set of bluegill sunfish (Lepomis macrochirus Rafinesque, 1819) to a series of angling sessions. Following this, a subset of 23 fish that had been captured at least once and 25 fish that had not been captured were assessed for metabolic phenotype (standard and maximum metabolic rates, postexercise oxygen consumption, and recovery time) via intermittent flow respirometry. Contrary to predictions, captured and uncaptured fish did not differ in any measurement of metabolic rate. These results suggest that metabolic phenotype is not a determinant of angling vulnerability within the studied context. It is possible, therefore, that previously described alterations in metabolic phenotype owing to angling pressure may be context-specific and may not apply to all species and angling contexts.

The Effect of Temperature on the Growth and Respiration of Fish Embryos (Salmo Fario)

1932 ◽  
Vol 9 (3) ◽  
pp. 271-276
Author(s):  
A. H. WOOD
Keyword(s):  
Growth Rate ◽  
Oxygen Consumption ◽  
Relative Intensity ◽  
Maximum Growth ◽  
Maximum Growth Rate ◽  
Effect Of Temperature ◽  
Total Oxygen ◽  
Average Efficiency ◽  
Complete Development ◽  
Time Required

1. The rate of respiration (as expressed in c.c. O2 per gram embryo per hour) of the embryos of Salmo fario remains constant at any given temperature until the embryo has reached its maximum growth-rate, after this point it declines. It is suggested that the rate of respiration may be proportional to the amount of available yolk. 2. When incubated at 7° C. the time required to complete development after hatching was 58 days and the total oxygen consumed by an average embryo during this period was 20·31 c.c. (N.T.P.). At 12° the time required for the completion of development was reduced to 27 days, but the oxygen consumption remained practically unchanged at 20·71 c.c. At 3° C. the time required for development was 108 days and the oxygen consumption was 26·96 c.c. per embryo. 3. At 7 and 12° C. the efficiency of development was found to be identical with the value given by Gray for 11·5° C., viz. 63 per cent.; at 3°C. the average efficiency over the period considered was only 54 per cent. 4. It is suggested that, between the limits of temperature to which a trout egg is normally exposed, the effect of temperature on respiration is neither greater nor less than its effect on the growth-rate; possibly both processes are dependent on the same controlling factor. Above and below this range of temperature, the relative intensity of the respiratory processes (to those of growth) is increased, and a smaller embryo is the final result of incubation.

Time–space relationships among structural and metamorphic aureoles related to granite emplacement: a case study from the Serre Massif (southern Italy)

2012 ◽  
Vol 150 (3) ◽  
pp. 441-454 ◽  
Author(s):  
VINCENZO FESTA ◽  
ALFREDO CAGGIANELLI ◽  
ANTONIO LANGONE ◽  
GIACOMO PROSSER
Keyword(s):  
Time Lag ◽  
Microstructural Analysis ◽  
Geometrical Analysis ◽  
Granite Emplacement ◽  
Time Space ◽  
Minimum Strain Rate ◽  
Time Required ◽  
Thermal Perturbations ◽  
Peak Assemblage

AbstractTectonic and thermal perturbations, related to emplacement of granodiorite in the upper continental crust, have been investigated in the late-Hercynian basement exposed in southern Calabria (Italy). Here, the structural aureole is marked by the presence of a major rim fold adjacent to the intrusive contact for a length of at least 20 km. Geometrical analysis of the structural aureole and related foliations, lineations and crenulations reveals that the perturbed zone is at least 3000 m wide and characterized by an open synform trending nearly parallel to the intrusive contact. This pattern is compatible with a laccolith-like mode of magma emplacement, related to the accretion of the pluton that shouldered weak phyllitic and slaty wall rocks. The metamorphic aureole, about 1800 m wide, is characterized by biotite, cordierite and andalusite that appear sequentially in spotted schists and hornfelses approaching the intrusive contact. The peak assemblage equilibrated between 535 and 590°C at pressures between 175 and 200 MPa, confirmed by Al-in-hornblende barometry on granodiorite. Microstructural analysis allowed the inference of a time lag between the thermal and tectonic perturbations. With the aid of thermal modelling it was possible to quantify the time required to reach the peak temperature at a distance from the intrusive contact where cordierite spots and andalusite porphyroblasts clearly overprint crenulations. This estimate represents the time limit to accomplish deformation in the inner portion of the aureole and thus indicates a minimum strain rate of 4 × 10−14 s−1 within the country rocks during granodiorite intrusion.

Interdisciplinary study on pottery experimentally impregnated with wine

2014 ◽  
Vol 68 (8) ◽  
Author(s):  
Eugenia Teodor ◽  
Georgiana Badea ◽  
Andreia Alecu ◽  
Larisa Calu ◽  
Gabriel Radu
Keyword(s):  
Capillary Electrophoresis ◽  
Lactic Acid ◽  
Tartaric Acid ◽  
Malic Acid ◽  
High Speed ◽  
White Wine ◽  
Good Resolution ◽  
Fine Grained ◽  
Electrophoresis Method ◽  
Time Required

AbstractExperimentally developed ceramic pots, with two different sizes of grain, were half-filled with wine and subjected to thermal alteration at constant elevated temperature ((60 ± 2)°C) in darkness for 12 weeks. This work sought to characterise the samples thereby obtained from chemical and mineralogical perspectives using scanning electron microscopy and an energy-dispersive X-ray microanalysis system (SEM-EDX), Fourier transform infrared spectroscopy (FTIR) and capillary electrophoresis (CE) with UV detection as an alternative to chromatographic methods, due to its good resolution, automation, simplicity, high speed, low consumption of chemicals and short time required for sample preparation. The capillary electrophoresis method was used for the detection of five wine biomarkers: succinic acid, malic acid, tartaric acid, citric acid and lactic acid. In general, it was noted that the fine-grained ceramic assortment retained the organic material better than the coarser-grained ceramics. An interesting observation derived from this study was that not only could tartaric acid be considered as a biomarker for wine residues in archaeological pottery, but malic acid could also act similarly for white wine and lactic acid for red wine.

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