Respiration studies and population metabolism of the gastropod Theodoxus jordani (Sowerby)
1
Citation
9
Reference
10
Related Paper
Abstract:
SUMMARY. 1. The oxygen consumption of the gastropod snail T. jordani was determined at six different temperatures corresponding to those experienced in the field. 2. The respiration rate increasing linearly with increasing tissue weight at all temperatures studied. Regression equations describing the respiration rate‐live weight relationship were significantly different ( P <0. 001). 3. The respiration rate‐temperature relationship was linear for seven weight classes of the population. The extent of change in the respiration rate with increasing temperature differed between the different weight classes. The Q 10 value was highest (2.5) for the smallest weight class and decreased with increasing size. 4. The annual respiratory loss by the whole population was estimated to be 334.75 kJ m −2 .Keywords:
Respiration rate
Using 3 cultivars of wampee (Clausena lansium), i.e. Large chicken heart, Small chicken heart and Round species as experimental materials, differences of respiration rate, productive rate of ethylene and quality of wampee fruits as well as their changes during storage at room temperature (28±2℃) were investigated, . The results showed that the rate of edible fruit, contents of total soluble solids and Vc decreased significantly, and rate of weight loss and contents of soluble pectin and protopectin increased significantly. Content of titratable acidity decreased rapidly within 2 days and increased 2 days later. Respiration rate raised remarkably after 4 days of storage, but no respiration climax was observed, which suggested that wampee belonged to the non-respiration climacteric fruit. Respiration rate of Large chicken heart was much higher than that of Small chicken heart and Round species in the late period of storage. Ethylene productive rate of wampee fruits increased within 4 days of storage, and then 揕arge chicken heart and Small chicken heart decreased apparently while Round species?continued increasing.
Respiration rate
Titratable acid
Climacteric
Pectin
Cite
Citations (0)
Effect of storage temperatures, O 2 concentrations and variety on respiration of mangoes The respiration rate of fruits and vegetables is an important indicator of senescence and ethylene production in fruits. Storage temperatures play a major role in the respiration rates of fruits and vegetables. Experiments were conducted to establish the influence of storage temperatures, O 2 concentrations and variety on the respiration of mangoes. The study was conducted on two varieties of mangoes namely, cvs ‘Banganapalli’ and ‘Thothapuri’. Experiments were conducted on a single fruit, weighing approximately 500 g and kept in separate glass bottles stored at 12, 20, 28, and 40 °C. Respiration rates were calculated and presented as the rate of release of CO 2 or the rate of consumption of O 2 . Respiration rates decreased with a decrease in temperature from 40 °C to 12 °C, and with a decrease in O 2 concentration from 21% to 1% in the micro-environment. The respiration rate was faster in ‘Banganapalli’ than in ‘Thothapuri’ as indicated by the CO 2 release rate. The rate of CO 2 release was very slow in mangoes stored at 12 °C in both the varieties and the rate decreased from 8.60 to 8.00 ml kg -1 h -1 in ‘Banganapalli’ variety and from 11.00 to 7.80 ml kg -1 h -1 in ‘Thothapuri’ variety. The respiration rates were faster at higher temperatures and remained low and stable at low temperatures. Using the respiration data, predictive models were developed for calculating the CO 2 release and O 2 consumption patterns.
Respiration rate
Cite
Citations (25)
Measurement of the respiration rate of fresh produce under different temperature is essential for the design of modiued atmosphere packaging (MAP). In this work respiration rate of fresh-cut bitter gourd was measured at storage temperatures of 8±2 and 30±2°C. As expected, temperature was the most inuuential factor on respiration rate. The respiration rate of pre-treated fresh-cut bitter gourd was studied under closed system. In closed system the respiration rate was less in 8±2°C with 59.64 ml/kg h (RO2) and 29 ml/kg h (RCO2) compared to ambient condition (30±2°C) of 87 ml/kg h -RO2, 40.6 ml/kg h -RCO2). As the temperature increases, the respiration rate also increases.
Respiration rate
Bitter gourd
Cite
Citations (1)
Individual respiration rates of 188 calf-fed Holstein steers (591 ± 43 kg) was observed over a 4-d period (July 10 through July 14, 2017). Steers were provided 7.2 m2/hd pen space with 3.7 m2/hd overhead shade). Respiration rate for each steer was measured at 0800, 0900, 1000 and 1100 h (2, 3, 4, and 5 h following the morning feeding). Ambient temperature averaged 32.9 ± 0.7, 34.9 ± 0.7, 36.6 ± 0.5, and 37.8 ± 0.5 C for the respective time intervals (corresponding to THI of 82.5 ± 1.1, 83.1 ± 1.2, 83.4 ± 0.9, and 83.8 ± 0.6, respectively). Although increasing (P < 0.01) with ambient temperature, respiration rates among steers at each time interval was highly variable, averaging 71.5 ± 10.3, 81.3 ± 10.4, 86.1 ± 11.4, and 87.1 ± 12.1 breaths/min, respectively. Individual respiration rate at 1100 h was not associated with live weight (r2 = 0.009, P = 0.22). Daily weight gain during the 28-d period prior to respiration measurements averaged 1.07 ± 0.41 kg and was likewise poorly associated (r2 = 0.012, P = 0.13) with respiration rate at 1100 h. We conclude that individual respiration rate is highly variable, and alone, may be an unreliable indicator of animal comfort based on growth performance.
Respiration rate
Cite
Citations (0)
Background: The rate of respiration of each agricultural commodity varies significantly from commodity to commodity and cultivar to cultivar. To build a controlled, modified or cold storage system and determine shelf life, it is necessary to quantify the rate of respiration and the heat generated as a result of respiration. Methods: A scientific study was carried out to determine the effect of different storage conditions on the rate of respiration and heat of respiration of mango fruits (cv. Alphonso). An air-tight multi-chamber temperature and RH control system was developed to experiment with various temperatures. Mango fruits were stored at 10, 15, 20, 25°C and ambient temperature in the developed air-tight multi-chamber system. The rate of respiration and heat of respiration was determined for different storage conditions. Result: At the beginning maximum rate of respiration, 63.22, 72.56, 81.13, 86.33, 101.55 ml CO2/kg/h and heat of respiration, 7096.53, 8322.05, 9119.29, 9589.19, 10547.55 kcal/metric ton/day was observed at 10, 15, 20, 25°C and ambient temperature respectively. It was found that under steady-state storage conditions the rate of respiration and heat of respiration was increased with an increase in temperature whereas decreased with time for all storage conditions.
Respiration rate
Cite
Citations (0)
Discuss the effects of measuring temperature and fresh-cut area for respiration rate of fresh-cut carrot. The results indicated that respiration rate of cold storage fresh-cut carrot should be measured under storage temperature, and the result of measuring under room temperature can't really reflect the respiration rate of storage. At the same time, the respiration will strengthen follow the enlarge of cut area.
Respiration rate
Cite
Citations (0)
【Objective】 The study probed into the change rule of leaf photosynthesis and leaf photo respiration and dark respiration with environment.【Method】 photosynthetic rate,leaf photo respiration rate,and dark respiration rate were measured for different leaves at different climate and temperature treatments,and those change rules and coefficients of photo respiration and dark respiration were analyzed for different leaves.【Result】 The results show that,it was single peak style curve in cloudy day and double peak style curve in sunny day for dairy change of leaf photosynthetic rate and photo respiration rate and dark respiration rate.The maximum value of the peak was at AM 10-12 on cloudy day,but the peak's time was different with different leaves on sunny days.The photosynthetic rate value of cotyledon was bigger than the first leaf 12 days after sowing,but then reversed.It was a sin function for the temperature effect on the photosynthesis.The photosynthesis rate valued was zero when temperature was lower than 6.5 ℃ or higher than 46 ℃.The maximum value of photosynthesis was at 28 ℃.Coefficient of leaf photo respiration and dark respiration was 0.16 and 0.20 respectively at 25 ℃.【Conclusion】 Muskmelon seedling leaf photosynthesis,leaf photo respiration and dark respiration changed with leaf age,leaf style and environment,and the changing rules for cotyledon and leaves were different.
Respiration rate
Cotyledon
Cite
Citations (2)
Respiration rate
Pulse rate
Skin conductance
Cite
Citations (6)
The relationship between specific rate of respiration (respiration rate per unit root dry weight) and concentration of reduced nitrogen was examined for maize (Zea mays L.) roots. Plants with 2 primary nodal root axes were grown for 8 days in a split-root hydroponic system in which NO-3 was supplied to both axes at 1.0 mol m−3, to one axis at 1.0 mol m−3 and the other axis at 0.0 mol m−3 or to both axes at 0.0 mol m−3 Respiration rates and root characteristics were measured at 2-day intervals. Specific rate of respiration was positively correlated in a nonlinear relationship with concentration of reduced nitrogen. The lowest specific rates of respiration occurred when neither axis received exogenous NO−3 and the concentration of reduced nitrogen in the axes was less than 9 mg g−1. The greatest rates occurred in axes that were actively absorbing NO−3 and contained more than 35 mg g−1 of reduced nitrogen. At 23 mg g−1 of reduced nitrogen, below which initiation of lateral branches was decreased by 30–50%. specific rate of respiration was 17% greater for roots actively absorbing NO−3 than for roots not absorbing NO−3 Increases in specific rate of respiration associated with concentrations of reduced nitrogen greater than 23 mg g−1 were concluded to be attributable primarily to proliferation of lateral branches.
Respiration rate
Dry weight
Cite
Citations (0)
The relationship between specific rate of respiration (respiration rate per unit root dry weight) and concentration of reduced nitrogen was examined for maize ( Zea mays L.) roots. Plants with 2 primary nodal root axes were grown for 8 days in a split‐root hydroponic system in which NO‐ 3 was supplied to both axes at 1.0 mol m −3 , to one axis at 1.0 mol m −3 and the other axis at 0.0 mol m −3 or to both axes at 0.0 mol m −3 Respiration rates and root characteristics were measured at 2‐day intervals. Specific rate of respiration was positively correlated in a nonlinear relationship with concentration of reduced nitrogen. The lowest specific rates of respiration occurred when neither axis received exogenous NO −3 and the concentration of reduced nitrogen in the axes was less than 9 mg g −1 . The greatest rates occurred in axes that were actively absorbing NO −3 and contained more than 35 mg g −1 of reduced nitrogen. At 23 mg g −1 of reduced nitrogen, below which initiation of lateral branches was decreased by 30–50%. specific rate of respiration was 17% greater for roots actively absorbing NO −3 than for roots not absorbing NO −3 Increases in specific rate of respiration associated with concentrations of reduced nitrogen greater than 23 mg g −1 were concluded to be attributable primarily to proliferation of lateral branches.
Respiration rate
Dry weight
Cite
Citations (26)