scholarly journals Air breathing in the Arctic: influence of temperature, hypoxia, activity and restricted air access on respiratory physiology of the Alaska blackfish Dallia pectoralis

2014 ◽  
Vol 217 (24) ◽  
pp. 4387-4398 ◽  
Author(s):  
S. Lefevre ◽  
C. Damsgaard ◽  
D. R. Pascale ◽  
G. E. Nilsson ◽  
J. A. W. Stecyk
Keyword(s):  
Respiratory Physiology ◽  
The Arctic ◽  
Air Breathing ◽  
Influence Of Temperature

scholarly journals Atypical respiratory Physiology of a recent air‐breathing fish: Pangasius

2015 ◽  
Vol 29 (S1) ◽  
Author(s):  
Mark Bayley ◽  
My Phuong ◽  
Christian Damsgaard ◽  
Do Thi Thanh Huong ◽  
Tobias Wang
Keyword(s):  
Respiratory Physiology ◽  
Air Breathing

scholarly journals Evolutionary and cardio‐respiratory physiology of air‐breathing and amphibious fishes

2019 ◽  
Vol 228 (3) ◽  
Author(s):  
Christian Damsgaard ◽  
Vikram B. Baliga ◽  
Eric Bates ◽  
Warren Burggren ◽  
David J. McKenzie ◽  
...  
Keyword(s):  
Respiratory Physiology ◽  
Air Breathing ◽  
Amphibious Fishes

Environmental Influences on the Respiratory Physiology and Gut Chemistry of a Facultatively Air-breathing, Tropical Herbivorous Fish Hypostomus regani (Ihering, 1905)

2016 ◽  
pp. 191-218 ◽  
Author(s):  
Jay A. Nelson ◽  
Flavia Sant’Anna Rios ◽  
José Roberto Sanches ◽  
Marisa Narciso Fernandes ◽  
Francisco Tadeu Rantin
Keyword(s):  
Environmental Influences ◽  
Respiratory Physiology ◽  
Herbivorous Fish ◽  
Air Breathing

Herring at the Arctic front: influence of temperature and prey on their spatio-temporal distribution and migration

2007 ◽  
Vol 28 ◽  
pp. 123-133 ◽  
Author(s):  
Leif Nøttestad ◽  
Ole Arve Misund ◽  
Webjørn Melle ◽  
Bente K. Hoddevik Ulvestad ◽  
Kjell Arild Orvik
Keyword(s):  
Temporal Distribution ◽  
The Arctic ◽  
Influence Of Temperature ◽  
Arctic Front ◽  
Spatio Temporal ◽  
And Migration

scholarly journals Respiratory Physiology of Intestinal Air Breathing in the Teleost Fish Misgurnus Anguillicaudatus

1987 ◽  
Vol 133 (1) ◽  
pp. 371-393 ◽  
Author(s):  
BRIAN R. McMAHON ◽  
WARREN W. BURGGREN
Keyword(s):  
Gas Exchange ◽  
Alimentary Canal ◽  
Co2 Exchange ◽  
Gas Diffusion ◽  
Respiratory Physiology ◽  
Misgurnus Anguillicaudatus ◽  
Air Breathing ◽  
Intestinal Gas ◽  
Partial Pressures ◽  
O2 Extraction

The Japanese weatherloaeh (Misgurnus anguillicaudatus Cantor) can exchange gases both with water, via gills and skin, and with air, via the posterior region of the alimentary canal (intestine). Air breathing occurs by unidirectional ventilation of the alimentary canal with air taken in at the mouth and simultaneous expulsion of intestinal gas from the vent. Although the weatherloaeh is not an obligate air-breather, aerial gas exchange normally occurs even at 10°C in air-saturated water. The alimentary canal was examined histologically to assess differences in capillary density and distribution and the diffusion distance for gases across those regions modified for aerial respiration. A respirometer system specifically designed for 2- to 3-g fish allowed continuous measurement of O2 and CO2 exchange via both aquatic and aerial routes at rest and at various ambient temperatures, and respiratory gas partial pressures. Air ventilation volumes, O2 and CO2 partial pressures of exhaled gas, O2 extraction, and O2 and CO2 exchange via the intestine were also determined, allowing the role of the intestine in total gas exchange in the weatherloaeh to be determined and compared with aerial gas exchange organs in other fishes. The alimentary canal is divided into three zones, an anterior glandular portion separated by a spiral section from the posterior, respiratory zone which has the greatest capillary densities and shortest gas diffusion distances. At rest (20°C), the intestine takes up about 20% of total O2 but accounts for less than 3 % of total CO2 elimination (gas exchange ratio = 0.08 for intestine). O2 extraction averages 50%. Increasing temperature causes only slight increases in total metabolic rate (Q10 for MOO2= 1.5-1.8), but highly significant increases in intestinal gas exchange relative to total gas exchange develop as temperature rises. Intestinal gas exchange also rises with decreasing O2 availability. A strong hypoxic drive and weak hypercapnic drive exist for aerial ventilation of the intestine, but are reduced or absent for aquatic ventilation of the gills. In spite of having to function in respiration, absorption, secretion and buoyancy regulation, the potential effectiveness of intestinal gas exchange is shown to be similar to that of other structures used for aerial gas exchange in facultative air-breathing fish.

The effect of temperature on high-resolution TEM image contrast

1995 ◽  
Vol 53 ◽  
pp. 640-641
Author(s):  
T. Geipel ◽  
W. Mader ◽  
P. Pirouz
Keyword(s):  
Form Factor ◽  
Inelastic Scattering ◽  
Accurate Method ◽  
Waller Factor ◽  
Effect Of Temperature ◽  
Specimen Thickness ◽  
Influence Of Temperature ◽  
Debye Waller Factor ◽  
Influence Of Temperature On ◽  
Atomic Form Factor

Temperature affects both elastic and inelastic scattering of electrons in a crystal. The Debye-Waller factor, B, describes the influence of temperature on the elastic scattering of electrons, whereas the imaginary part of the (complex) atomic form factor, fc = fr + ifi, describes the influence of temperature on the inelastic scattering of electrons (i.e. absorption). In HRTEM simulations, two possible ways to include absorption are: (i) an approximate method in which absorption is described by a phenomenological constant, μ, i.e. fi; - μfr, with the real part of the atomic form factor, fr, obtained from Hartree-Fock calculations, (ii) a more accurate method in which the absorptive components, fi of the atomic form factor are explicitly calculated. In this contribution, the inclusion of both the Debye-Waller factor and absorption on HRTEM images of a (Oll)-oriented GaAs crystal are presented (using the EMS software.Fig. 1 shows the the amplitudes and phases of the dominant 111 beams as a function of the specimen thickness, t, for the cases when μ = 0 (i.e. no absorption, solid line) and μ = 0.1 (with absorption, dashed line).

The Arctic Climate System

2005 ◽  
Author(s):  
Mark C. Serreze ◽  
Roger G. Barry
Keyword(s):  
Climate System ◽  
Arctic Climate ◽  
The Arctic
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