Survival of Lobsters, Homarus americanus, out of Water

1965 ◽  
Vol 22 (2) ◽  
pp. 385-394 ◽  
Author(s):  
D. W. McLeese
Keyword(s):  
Metabolic Rate ◽  
Survival Time ◽  
Inverse Relationship ◽  
Sea Water ◽  
Homarus Americanus ◽  
Oxygen Mixture ◽  
Moist Air ◽  
Water Exposure ◽  
The Relationship

Median resistance times (MRT) in moist air at 0, 5, 10, and 15 °C were determined for lobsters acclimated at 0, 10, and 20 °C. At temperatures above 4–8°C depending on acclimation, there was an inverse relationship between median resistance time and temperature. A break in the relationship occurred at 4–8 °C and further lowering of temperature to 0 °C had no effect on MRT. Survival time was not increased by continuous sprays of sea water. Exposure to an air–oxygen mixture containing 40% oxygen by volume had no effect; however, lobsters died faster at 55–85% oxygen. Fed lobsters died faster than starved ones. An inverse relationship between MRT and metabolic rate was indicated.

Association between Social Media Use for Health Purpose and Depressive Symptoms: A Cross-Sectional Survey (Preprint)

2020 ◽  
Author(s):  
Hee Yun Lee ◽  
Yan Luo ◽  
Cho Rong Won ◽  
Jiyoung Lee ◽  
Jeongwon Baik
Keyword(s):  
Social Media ◽  
Depressive Symptoms ◽  
Social Networking Sites ◽  
Inverse Relationship ◽  
Age Groups ◽  
Cross Sectional Survey ◽  
Cross Sectional ◽  
Use Of Social Media ◽  
The Relationship ◽  
Health Purpose

BACKGROUND The use of social media or social networking sites (SNS) is increasing across all age groups, and one of the primary motives of using SNS is to seek health-related information. Although previous research examining the effect of SNS use on depression exist, studies regarding the effect of SNS use for health purpose on depression is limited. OBJECTIVE Our study aims to explore the relationship between SNS use for health purpose and depression across the four age groups (18-34 years old, 35-49 years old, 50-64 years old, and above 65 years old). METHODS A sample of 6,789 adults aged 18 and older was extracted from a 2017 and 2018 Health Information National Trends Survey (HINTS). Univariate and bivariate analyses to examine the association between each variable and four age groups were conducted. Multiple linear regression analyses to predict depression level among participants with use of SNS for health purpose were conducted. RESULTS SNS use for health purpose and depression were positively associated for three age groups but not for those 65 years or older (=0.13, P<0.05; =0.08, P<0.05; =0.09, P<0.05). Income and self-reported health status indicated an inverse relationship for all age groups. The relationship with marital status differed based on age group with 18 and 34 years old showing an inverse relationship (=-0.13, P<0.01) while 65 years or older showing a positive relationship (=0.06, P<0.05). Gender was positively associated among those in the 35-49 years old (=0.09, P<0.05) and 65 years or older (=0.07, P<0.05). Being Non-Hispanic White was positively associated with depression among 50-64 years old (=0.07, P<0.001) and 65 years or older (=0.08, P<0.05). CONCLUSIONS Age-tailored education on determining accurate and reliable information shared via SNS is needed to reduce depressive symptoms.

scholarly journals Macronutrient Quality and All-Cause Mortality in the SUN Cohort

Nutrients ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 972
Author(s):  
Susana Santiago ◽  
Itziar Zazpe ◽  
Cesar I. Fernandez-Lazaro ◽  
Víctor de la de la O ◽  
Maira Bes-Rastrollo ◽  
...  
Keyword(s):  
Quality Index ◽  
Inverse Relationship ◽  
A Priori ◽  
The Sun ◽  
Significant Inverse Relationship ◽  
Carbohydrate Quality ◽  
All Cause Mortality ◽  
Middle Aged Adults ◽  
The Relationship

No previous study has assessed the relationship between overall macronutrient quality and all-cause mortality. We aimed to prospectively examine the association between a multidimensional macronutrient quality index (MQI) and all-cause mortality in the SUN (Seguimiento Universidad de Navarra) (University of Navarra Follow-Up) study, a Mediterranean cohort of middle-aged adults. Dietary intake information was obtained from a validated 136-item semi-quantitative food-frequency questionnaire. We calculated the MQI (categorized in quartiles) based on three quality indexes: the carbohydrate quality index (CQI), the fat quality index (FQI), and the healthy plate protein source quality index (HPPQI). Among 19,083 participants (mean age 38.4, 59.9% female), 440 deaths from all causes were observed during a median follow-up of 12.2 years (IQR, 8.3–14.9). No significant association was found between the MQI and mortality risk with multivariable-adjusted hazard ratio (HR) for the highest vs. the lowest quartile of 0.79 (95% CI, 0.59–1.06; Ptrend = 0.199). The CQI was the only component of the MQI associated with mortality showing a significant inverse relationship, with HR between extreme quartiles of 0.64 (95% CI, 0.45–0.90; Ptrend = 0.021). In this Mediterranean cohort, a new and multidimensional MQI defined a priori was not associated with all-cause mortality. Among its three sub-indexes, only the CQI showed a significant inverse relationship with the risk of all-cause mortality.

The Relationship of Undifferentiated Mesenchymal Cells to TMJ Articular Tissue Thickness

1992 ◽  
Vol 71 (11) ◽  
pp. 1816-1821 ◽  
Author(s):  
C.A. Bibb ◽  
A.G. Pullinger ◽  
F. Baldioceda
Keyword(s):  
Soft Tissue ◽  
Inverse Relationship ◽  
Biological Processes ◽  
Spearman Correlation ◽  
Articular Eminence ◽  
Tissue Thickness ◽  
Cartilage Layer ◽  
Soft Tissue Thickness ◽  
Relationship Of ◽  
The Relationship

Undifferentiated mesenchymal (UM) cells, the progenitor cells of the cartilage layer, have been assigned a significant role in TMJ articular tissue maintenance. This was based on reports of UM cell reduction with increased soft-tissue thickness for the condyle and temporal component. However, the strength of this inverse relationship was not presented and remained unclear. The purpose of the present study was to assess the strength of the correlation between UM cell presence and soft-tissue thickness in young adult TMJs at autopsy. Sagittal histological sections from the central thirds of 50 joints were evaluated with respect to articular soft-tissue thickness, histological character, and UM cell presence in the condyle and temporal component. The superior sector ofthe condyle and the articular eminence showed the greatest variability in soft-tissue thickness and were the only areas to show localized UM cell absence. The eminence was the only location to show an inverse relationship between soft-tissue thickness and UM cell presence, and this was consistent in both an ANOVA (p = 0.0016) and a Spearman correlation analysis. However, the strength of this correlation was only moderate (rho = -0.52), and no such relationship was observed in any other location. This study suggests that the relationship between UM cell presence and soft-tissue thickness is more complex than previously hypothesized and that the contribution of UM cells to articular tissue maintenance has been overstated, while other biological processes were overlooked.

The Relationship of Mode and Intensity of Training on Resting Metabolic Rate in Women

2001 ◽  
Vol 11 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Heidi K. Byrne ◽  
Jack H. Wilmore
Keyword(s):  
Metabolic Rate ◽  
Resting Metabolic Rate ◽  
Cross Sectional Study ◽  
Cross Sectional ◽  
Women Subjects ◽  
Present Cross Sectional Study ◽  
Significant Difference ◽  
Level Of Training ◽  
The Relationship ◽  
Aerobically Trained

The present cross-sectional study was designed to investigate the relationship between exercise training and resting metabolic rate (RMR). The focus of this investigation was to compare RMR in aerobically trained (AT), resistance trained (RT), and untrained (UNT) women. Subjects were also classified as highly trained (HT), moderately trained (MT), or untrained (UNT) in order to examine the relationship between RMR and level of training. Sixty-one women between the ages of 18 and 46 years volunteered to serve as subjects in this study. Each subject completed measurements of body composition, maximal oxygen uptake (V̇O2max), and two consecutive measurements of RMR. The data presented show that there was no significant difference in resting metabolic rate between resistance-trained, aerobically trained, and control subjects. However, when grouped by intensity of training, there was a trend for an increased resting metabolic rate (kcal/day) in the highly trained subjects, regardless of mode of training.

Muscle Weight Relationship to Serum Proteins, Hemocytes, and Hepatopancreas in the Lobster, Homarus americanus

1967 ◽  
Vol 24 (11) ◽  
pp. 2339-2354 ◽  
Author(s):  
James E. Stewart ◽  
John W. Cornick ◽  
Diane M. Foley ◽  
M. F. Li ◽  
C. M. Bishop
Keyword(s):  
Serum Protein ◽  
Physiological Condition ◽  
Serum Proteins ◽  
Homarus Americanus ◽  
Total Serum Protein ◽  
Total Serum ◽  
Experimental Conditions ◽  
Muscle Weight ◽  
Beef Liver ◽  
The Relationship

Total serum protein values, hemocyte numbers, and muscle weights were determined for 216 intermolt lobsters immediately after their capture, and for 230 others held captive under a variety of dietary and environmental conditions. Average muscle values ranged from approximately 13% to the more normal 20–25% of the live animals' weight, depending upon experimental conditions. The total serum protein up to a level of 55 mg/ml was shown to be a reliable indicator of muscle weights, although the relationship was not identical for all lobster groups. It appeared to be modified chiefly by the areas from which the different groups were taken. Diet was more important than the temperatures (5 to 14 C) in affecting changes in muscle and serum protein values. Starvation caused a greater reduction (50 to 70%) in the size of the hepatopancreas than in the muscle. Histological examination of the hepatopancreatic tissue showed that the lipid content was markedly reduced upon starvation and that a degeneration of this organ was apparent for lobsters fed a beef liver and herring diet. Measurement of serum proteins would appear to be a useful technique in experiments on lobster nutrition and have value, within specified limits, for assessing the physiological condition of wild lobsters.

Leptocephalus energetics: metabolism and excretion

1999 ◽  
Vol 202 (18) ◽  
pp. 2485-2493
Author(s):  
R.E. Bishop ◽  
J.J. Torres
Keyword(s):  
Metabolic Rate ◽  
Energy Budget ◽  
Citrate Synthase ◽  
Sea Water ◽  
Negative Slope ◽  
Ion Pump ◽  
Metabolic Rates ◽  
Energy Reserves ◽  
Developmental Strategy ◽  
Juvenile Form

Leptocephali are the unusual transparent larvae that are typical of eels, bonefish, tarpon and ladyfish. Unlike the larvae of all other fishes, leptocephali may remain in the plankton as larvae for several months before metamorphosing into the juvenile form. During their planktonic phase, leptocephali accumulate energy reserves in the form of glycosaminoglycans, which are then expended to fuel metamorphosis. The leptocephalus developmental strategy is thus fundamentally different from that exhibited in all other fishes in two respects: it is far longer in duration and energy reserves are accumulated. It was anticipated that the unusual character of leptocephalus development would be reflected in the energy budget of the larva. This study describes the allocation of energy to metabolism and excretion, two important elements of the energy budget. Metabolic rates were measured directly in four species of leptocephali, Paraconger caudilimbatus, Ariosoma balearicum, Gymnothorax saxicola and Ophichthus gomesii, using sealed-jar respirometry at sea. Direct measurements of metabolic rates were corroborated by measuring activities of lactate dehydrogenase and citrate synthase, two key enzymes of intermediary metabolism, in addition to that of Na(+)/K(+)-ATPase, a ubiquitous ion pump important in osmotic regulation. Excretion rates were determined by subsampling the sea water used in the respiratory incubations. The entire premetamorphic size range for each species was used in all assays. Mass-specific oxygen consumption rate, excretion rate and all enzyme activities (y) declined precipitously with increasing mass (M) according to the equation y=aM(b), where a is a species-specific constant and −1.74&lt;b&lt;-0.44. In leptocephali, the highly negative slope of the familiar allometric equation describing the relationship between mass-specific metabolic rate and mass, normally between −0.33 and 0, showed that a massive decline in metabolic rate occurs with increasing size. The result suggests that the proportion of actively metabolizing tissue also declines with size, being replaced in large measure by the metabolically inert energy depot, the glycosaminoglycans. Leptocephali can thus grow to a large size with minimal metabolic penalty, which is an unusual and successful developmental strategy.

Effects of Television on Metabolic Rate: Potential Implications For Childhood Obesity

PEDIATRICS ◽  
1993 ◽  
Vol 91 (2) ◽  
pp. 281-286
Author(s):  
Robert C. Klesges ◽  
Mary L. Shelton ◽  
Lisa M. Klesges
Keyword(s):  
Energy Expenditure ◽  
Metabolic Rate ◽  
Television Viewing ◽  
Resting Energy Expenditure ◽  
Normal Weight ◽  
Laboratory Setting ◽  
Obese Children ◽  
Two Measures ◽  
The Relationship ◽  
Resting Energy

The effects of television viewing on resting energy expenditure (metabolic rate) in obese and normal-weight children were studied in a laboratory setting. Subjects were 15 obese children and 16 normal-weight children whose ages ranged from 8 to 12 years. All subjects had two measures of resting energy expenditure obtained while at rest and one measurement of energy expenditure taken while viewing television. Results indicated that metabolic rate during television viewing was significantly lower (mean decrease of 211 kcal extrapolated to a day) than during rest. Obese children tended to have a larger decrease, although this difference was not statistically significant (262 kcal/d vs 167 kcal/d, respectively). It was concluded that television viewing has a fairly profound lowering effect of metabolic rate and may be a mechanism for the relationship between obesity and amount of television viewing.

Role Strain, Coping, and Marital Satisfaction of Stepparents

1992 ◽  
Vol 73 (2) ◽  
pp. 79-92 ◽  
Author(s):  
Doni Whitsett ◽  
Helen Land
Keyword(s):  
Marital Satisfaction ◽  
Inverse Relationship ◽  
Role Strain ◽  
Self Esteem ◽  
Coping Resources ◽  
Cross Sectional ◽  
New Information ◽  
Study Results ◽  
And Coping ◽  
The Relationship

The relationship among role strain, coping, and marital satisfaction is examined in a cross-sectional sample of 73 stepparents. New information is discussed pertaining to differential types of role strain identified in stepparent groups. The association between types of role strain and differential types of coping strategies and coping resources is analyzed. Results document the association between coping resources of self-esteem and self-efficacy and certain dimensions of role strain. An inverse relationship between role strain and marital satisfaction is noted. Based on study results, the authors identify vulnerable subgroups and suggest implications for practice with stepfamilies.

scholarly journals Analyzing the Relationship between Organizational Culture and Silence with Organizational Health among Employers of Fars Maskan Bank

2017 ◽  
Vol 9 (1) ◽  
pp. 234
Author(s):  
Asiyeh Foshat ◽  
Reza Zarei
Keyword(s):  
Organizational Culture ◽  
Inverse Relationship ◽  
Pearson Correlation ◽  
Organizational Health ◽  
Fars Province ◽  
Statistical Population ◽  
Organizational Silence ◽  
Statistical Sample ◽  
The Relationship ◽  
Regression Tests

This study aims to analyze the relationship between organizational culture and silence with organizational health. The methodology of the study is correlation, and its statistical population is 642 that are all employers in Maskan Bank in Fars province. Sampling was executed through one-phase clustering sampling in which 130 persons were selected as statistical sample. Three questionnaires of organizational health (Hawaii et al., 1987), organizational culture (Hofstede, 1980), and organizational silence (Vacola & Bouradas, 2005) were used for collecting data. Data was analyzed step to step using Pearson correlation coefficient and multiple regression tests. Results indicated that there is a significant inverse relationship between organizational culture and silence with organizational health (less than 0.01). Higher level managers’ view of silence (among elements of organizational silence) and patriarchy (among elements of organizational culture) are capable of predicting organizational health in inverse. Other elements are not significantly capable in predicting organizational health.

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