Search results for “temperatures

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18 articles

CFD Simulation Study on Shell Made of Composite Material when Subject to Temperatures Above 3000 Degrees Centigrade

Oct 2020 DOI 10.14302/issn.2377-2549.jndc-20-3534
Hari Venkateswara Rao C.Corresponding author Ph.D Scholar, Mechanical Engg. Dept., UCE, Osmania University, Hyderabad – 07

In this article I am explaining the Computational Fluid Dynamics (CFD) simulation study on shell made of Composite material when subject to Temperatures above 3000ºC. In this analysis a shell is made of the composite structure with all the properties defines as of the Carbon Phenolic materials and is subjected to temperatures of 3000ºC and the flow pattern over the surface is studied and the velocity gradients on the shell when travelling with such high speeds and temperatures are studied. This simulation study can be used to predict the flow simulation in various applications of heat transmission. This CFD simulation study results are useful to make a CP composite material for better thermal applications in aerospace industry.

Agronomy Research Open Access

Reproductive Ability of Currant–Gooseberry Hybrids After Cryopreservation of Pollen in Liquid Nitrogen

Dec 2025 DOI 10.14302/issn.2639-3166.jar-24-5295
G. Verzhuk V.Corresponding author

The present study of the reproductive ability of currant and gooseberry hybrids after long-term cryopreservation of pollen in liquid nitrogen is of enormous importance for organizing the conservation of the diversity of this crop. Four distant interspecific hybrids of currant and gooseberry served as objects of the study. The pollen fertilizing ability was studied by pollination of allotetraploid Jošta with pollen of tetraploid hybrids stored for a year at ultra-low temperatures (–196°C) and freshly collected pollen (control pollination). Berry set in 2022, when pollinated with cryopreserved pollen, averaged 56.4% and was higher than in the control pollination (38.2%). In 2023, the number of berries set on average for all cross combinations in the experiment was also quite high (59.6%), but lower than in the pollination control (81.4%), which can be explained by unfavorable weather conditions during pollen collection in the year of establishment (2022). The obtained data specify that pollen of the allotetraploids does not lose its high fertilizing ability during its long-term cryopreservation. Berry setting, average berry weight and seed production are quite high and comparable to pollination with freshly collected pollen (control pollination variant). Seed germination and values of morphometric parameters of seedlings obtained from pollination with cryopreserved and freshly collected pollen in most cases have close values. Cryopreservation of pollen of currant-gooseberry hybrids for a year and more allows to preserve pollen for successful pollination and berry formation and is a reliable way to preserve germplasm.

Weather Changes Open Access

Vulnerabilities in Environment and Health Due to Climate Change and Extreme Hydrological Events: Determinants for Risk Reduction

Nov 2025 DOI 10.14302/issn.3070-3379.jwc-25-5549
Chukwuma Sr ChrysanthusCorresponding author

This short communication/mini-review immensely emphasizes human health to explicate and elucidate management of the global scourge associated with the determinants and impact of vulnerabilities to extreme hydrologic events and climate change in the absence of risk reduction and their concomitant sequelae. The most effective approach for risk reduction associated with biodiversity, environmental, and health vulnerabilities due to climate change and extreme hydrological events, an ecological framework must take into cognizance exposure, vulnerability, and resilience. This framework emphasizes the significance of understanding the inextricable linkage between ecosystems and human communities are exposed and susceptible to hazards, sensitivity to these hazards, and capacity to cope, adapt and recuperate. Risk reduction incorporates structurally attenuating exposure, strengthening resilience, and sustainably enhancing overall vulnerability management. Extreme weather and climate-associated incidents impinge on human health with consequential morbidity, mortality and socioeconomic challenges and constraints. Climate change and extreme event have altered the frequency, intensity, geographic distribution, and propensity as drivers for change in the future. The indicted variables include hydrological events, such as precipitation, floods and droughts as well as heat waves, wildfires, global warming, extreme temperatures, and hurricanes. The pathways inextricably-linked with extreme events to economic dissipation, human health prognosis and outcomes remain inexplicably diverse and complex; and thus, difficult to predict due to their emergence and reemergence from local, societal and environmental factors which influence disease burden.

Exploring the Nanomedicinal Features of Ayurvedic Bhasmas: Insights from Traditional Medicine

Oct 2025 DOI 10.14302/issn.3070-3360.ijco-24-5294
Adhikari RameshwarCorresponding author

Ayurveda is a traditional and scholarly medical system practiced in South Asia since the Vedic period. It integrates science and philosophy to promote a healthy, happy and prosperous life. Ayurvedicbhasmas are classical formulations that contain non-toxic forms of metals and minerals, enriched with therapeutic metabolites. These bhasmas are produced through repeated trituration of metals and minerals with the extracts from potent Ayurvedic herbs, followed by intense heating at temperatures above 650 °C. The preparation process of bhasmas closely resemble top-down approach in nanoparticle synthesis, resulting in very fine calcined nano-powders. These powders are used effectively in Ayurvedic treatments for various ailments, particularly chronic diseases. Recent studies have highlighted that bhasmas possess antioxidant, anti-inflammatory, antibacterial, antiviral and antitumor properties and may serve as potential carriers for drug delivery. This paper aims to compare bhasma particles prepared by traditional and modern methods, explore the therapeutic benefits of different bhasmas, and investigate the nanomedicinal features of various Ayurvedicbhasmas.

Weather Changes Open Access

Impact of Climate Change on Public Health in Rwanda

Sep 2024 DOI 10.14302/issn.3070-3379.jwc-24-5199
Fidele NizeyimanaCorresponding author

Rwanda is a small Central African country. A land with thousands of hills and mountains. It is a low-income country and one of Africa's fastest-growing economies. It is home to a variety of ecosystems, such as mountainous rainforests, gallery forests, savanna woodlands, wetlands, aquatic forests, and agroecosystems. From rising temperatures to changing rainfall patterns, the hidden dangers of climate change are unmasking themselves in the form of various health risks. Every year, many deaths, bodily injuries, and house collapses, among other repercussions, are documented as detrimental effects of climate change events on public health. This article delves into the intricate relationship between climate change and public health in Rwanda, exploring the adverse effects it has on vulnerable communities. By shedding light on this pressing issue, we can better understand the urgency of taking action to mitigate the impact of climate change on public health as well as potential solutions to the current predicament. The authors researched several literatures to develop their perspectives on the subject and explored potential solutions to protect the well-being of Rwandans in the face of this global crisis.

Farming Open Access

Research Achievements of Hot Pepper (Capsicum Species) and it Agro-Ecological Requirements in Ethiopia a Review

Apr 2023 DOI 10.14302/issn.3070-2232.jf-21-3946
Nigussie GebresilassieCorresponding author

Hot pepper is an important spice and vegetable crop in Ethiopia. Its production is constrained by a number of problems among which climatic condition is the primary. The amount rain fail temperature humidity the solanaceous groups of vegetables including hot pepper generally are sensitive to environmental conditions. The amount of rain fall required depends on the altitude of the environment, wind speed sunshine hour, which in turn is influenced by a number of genetic and environmental variables. In the absence of any other production constraints, suitable climatic condition and yield of hot pepper are closely related. Pepper, like other crop produces well when it is grown in good environmental condition. Farmers produce hot pepper in different environment without considering the suitable environment. The yield of hot pepper varies year to year; this indicates that pepper crop need intensive care and management for high return per unit area and also appropriate environmental condition. So in order to produce good hot pepper with the required amount of capsaicinoid content it is butter to grow at temperature range of 17.5-28oc. at low altitude hot environment give high capsaicinoid content and in high altitude / Low humidity and high temperatures will cause abscission of buds, flowers and small fruits.

Evolutionary Science Open Access

Molecular Evolution of the Novel Coronavirus SARS-CoV-2

May 2021 DOI 10.14302/issn.2689-4602.jes-21-3837
O. Henderson JeffreyCorresponding author Department of Science and Mathematics, Judson University, Elgin, IL 60123, USA

The coronavirus infectious disease (20)19 (COVID-19) pandemic is caused by a newly identified virus (2019) SARS-CoV-2, a beta coronavirus that shares similarities with other human-infecting coronaviruses. Genomic analysis suggests that SARS-CoV-2 is closely related to SARS-CoV, a bat-related coronavirus, RaTG13, and to other pangolin-associated coronaviruses. The spike protein of coronaviruses are glycoproteins and are responsible for attaching the virus to the host cell and entering. Amino acid changes within the spike protein-encoding gene from SARS-CoV to SARS-CoV-2 enable SARS-CoV-2 to form a stable spike protein, to form a stable complex between the S protein and the receptor ACE2, to increase binding points between the S protein and ACE2, and to survive at higher temperatures. SARS-CoV-2 is zoonotic, with genomic analysis implicating bats as the original host and pangolins as the most likely intermediate host to infect humans. As SARS-CoV-2 infects humans, viral point mutations will continually occur and cause the emergence of new competitive SARS-CoV-2 strains. Two major strains include D614G and N501Y and have increased infectivity and transmission, further complicating the scope of the current COVID-19 pandemic. Vigilant monitoring of viral development and evolution is necessary for developing proper treatment methods and vaccine targets.

Evaluation of Physicochemical, Spectral and Thermal Properties of Energy of Consciousness Healing Treated Iron Sulphate

Feb 2021 DOI 10.14302/issn.2377-2549.jndc-21-3722
Jana SnehasisCorresponding author Trivedi Science Research Laboratory Pvt. Ltd., Thane (W), Maharashtra, India.

Iron sulphate is used in the treatment of iron deficiency anaemia and other chronic disorders such as heart and kidney diseases. This study has the objective to analyze the impact of The Trivedi Effect®-Energy of Consciousness Healing Treatment on the physicochemical, spectroscopic and thermal properties of iron sulphate using various analytical techniques. In this, the test compound, i.e., iron sulphate was divided into two parts; one as control (without Biofield Energy Treatment), and the other as Biofield Energy Treated, which received the Biofield Energy Treatment remotely by the renowned Healer, Mr. Mahendra Kumar Trivedi. The PXRD analysis of the Biofield Energy Treated sample showed significant alterations in the range of -39.49 to 301.40% in the relative intensities, and from -15.40 to 33.36% in the crystallite sizes, compared with the control sample. The average crystallite size of the treated sample was also increased by 4.98% as compared to the control sample. The particle sizes in the treated sample at d10, d50, d90 and D(4,3) values were significantly increased by 67.12%, 47.72%, 33.18% and 42.01%, respectively; whereas, the specific surface area was significantly reduced by 38.39%, compared with the control sample. The TGA thermograms showed three steps of thermal degradation in which, the weight loss of Biofield Energy Treated sample in the first and second step was reduced by 5.82% and 16.09%, respectively, while, it was increased by 6.78% in the third step, compared to the control sample. The total weight loss in the treated sample was also reduced by 2.76%, along with slight alteration in the maximum thermal decomposition temperature, compared with the control sample. The DSC analysis showed the decrease in the melting temperatures of the 1st, 2nd and 4th peaks by 8.24%, 19.29%, and 0.61%, respectively, while 4.57% increase in the 3rd peak of the treated sample, compared with the control sample. The latent heat of fusion (ΔH) corresponding to the 1st, 2nd, 3rd and 4th peaks of the treated sample also showed alterations by -92.29, -86.29, 60.92, and 6.37%, respectively, compared with the control sample. The Trivedi Effect®-Consciousness Energy Healing Treatment might produce a novel polymorphic form of iron sulphate having increased crystallite and particle size along with enhanced thermal stability. It may help in improving the quality, safety and stability during the process of handling, storage, and shipment of the iron sulphate with better therapeutic response against iron deficiency anaemia.

The Feasibility of Enzyme Immunoassay Tests in the Absence of a Conventional Source of Electricity

Oct 2020 DOI 10.14302/issn.2576-6694.jbbs-20-3517
S.U. DOSSOU CamilleCorresponding author Laboratoire de Recherche en Biologie Appliquée, Ecole Polytechnique d’Abomey-Calavi (EPAC), University of Abomey-Calavi, 01 BP 2009 Cotonou, Benin.

Background of the Study African  countries are facing frequent blackout. Thus in sub Saharan region, due to frequent power cut, the laboratory professionals find sometimes difficulty to carry out earlier diverse diagnostic tests. Objective The  aim of this work is to evaluate the feasibility of enzyme immunoassay tests in the absence of a conventional source of electricity. Methods We  developed a battery-powered experimental device, which was then applied to diagnose measles. The samples included 45 sera randomly selected from non-haemolysed serum samples received and stored at the National Public Health Laboratory of Benin. The experimental device is composed of two devices (Devices 1 and 2). The Device 1 provided an average temperature of 34.47 °C, 20 min after starting. With Device 2 an average temperature of 20.32 °C is obtained 15 min after starting. Results With  the experimental device the same rate of measles antibody-positive sera (44.68%) was obtained as recorded from the test using the standard equipment of laboratory. The experimental device detected 18 negative and 8 intermediate results against respectively 19 and 7 by the standard equipment. The analysis of the results of both equipments shows a concordance rate of 93.33% with a kappa reproducibility coefficient of 0.89. Conclusion The  device conceived in our study is a simply equipment allowing the realization of the enzyme immunoassay tests, in this case the ELISA anti-measles test. The rate of concordance obtained shows that this device can be used with commercial kits and at temperatures close to those recommended by the manufacturer without altering the results.

Effect of Drought and Salt Stress on Cereal Crop Plants and their Proteomic and Physiological Studies

Sep 2020 DOI 10.14302/issn.2576-6694.jbbs-20-3525
K. Srivastava RajeshCorresponding author Department of Biotechnology, GITAM Institute of Technology, GITAM Deemed to be University, Gandhi Nagar Campus, Rushikonda, Visakhapatnam - 530045 (A.P.), India.

The photosynthetic potential and underlying internal metabolism of a plant are some of the most commonly affected physiological functions as a direct consequence of stresses due to salt and water resulting in hindering plant growth and productivity. Under the influence of such detrimental stresses, a drastic alteration in a plant's osmotic requirements, hormonal production, shedding of leaves, and closure of stomata, along with a lessening in the diffusion and transportation of CO2 and H2O are commonly seen. This review unfolds with a description of the basic methodology involved in the proteomic analysis of various proteins involved in stress response along with a brief idea on identifying and obtaining a genomic sequence for proteomic studies. It then dives deep into understanding the impact of abiotic stresses such as salinity, drought and high temperatures on cereal crops such as rice and sorghum as well as the internal dynamics of tolerance mechanism unfolding during stresses have also been described. Extensive literature describing the proteomic and physiological responses to primary and secondary effects of salt stress in cereal crops emphasizing on ROS production and apoptosis, the role of osmolytes as ROS scavengers during osmotic stress and vacuolar antiporters in ionic stress along with the responses during drought stress such as the accumulation of LEA proteins and ABA-based signaling has been reviewed and critically discussed. The study also sheds light on some experimental proteomic studies conducted on the seedlings, root tissues, and shoots of rice cultivars.

Model Based Research Open Access

Experimental Analysis PVP Coated Silver Nanofluid Properties for Application in Photovoltaic/Thermal (PVT) Collectors

Aug 2020 DOI 10.14302/issn.2643-2811.jmbr-20-3476
Naderi A.Corresponding author School of Mechanical Engineering, Imam Ali University, Tehran, Iran,

Nowadays, supplying energy for the global population has turned into a prominent issue for countries engendering the consumption of huge amounts of fossil fuels which leads to some serious environmental problems. Among the renewable energy technologies, solar collectors can play major role to improve the efficiency, in air conditioning utility systems by minimum pollution. In photovoltaic/thermal (PVT) solar collectors, which are currently considered as the most advanced type to produce electricity and heat simultaneously, working fluid absorbs Energy from photovoltaic (PV) module engendering to decrease temperature of PV module and increase the electricity efficiency and also provide permissible amount of heat for other residential applications. Meanwhile, utilizing nanofluid as the working fluid in collector, regarding that the nanofluid has enhanced thermal properties relative to the base fluid, leads to a higher collector efficiency. In this research, PVP coated silver nanofluid was prepared in three volume concentration being 250, 500 and 1000 ppm by two-step method. To assess the stability of nanofluid the zeta potential is calculated which is obtained -41.6 V. Also, the prominent thermal properties of the nanofluid were analyzed regarding PVT solar collector applications. According to the results, thermal conductivity of the PVP coated silver nanofluid, improves the properties of base fluid, to the extent that thermal conductivity coefficient grows up 50% in some temperatures and increased from 0.594 for base fluid to 1.098 W/mK by escalation of concentration to 1000 ppm. Thus, PVP coated silver nanofluid can be deemed as the vital working fluid to improve the performance of PVT solar collectors.

Study of the Nanocomposite Mo2C(1-x)-TiC(x)-SWCNTs by Field Actived Sparck Plasma Sintering Process

Apr 2020 DOI 10.14302/issn.2689-2855.jan-20-3244
Bendjemil BadisCorresponding author DGM, FST, University of 8 Mai 1945 of Guelma, 24000 Guelma, Algeria

Nanocomposites are worn resistant materials used in cutting tool applications. The materials are composed of ultrafine powder hard phase grains surrounded by a tough binder phase carbon nanotubes (Mo2C)1-x–(TiC)x (2≤x≤4)//1Wt% SWCNTs. Composite bicarbide Mo2C-TiC was rapidly synthesised and simultaneously consolidated by field activated sintering technique (spark plasma sintering) at which the extensive volume expansion occurred as a function of the volumic fraction from 20 to 40 vol.% of TiC powders and 1 Wt.% of SWCNTs was reinforcement of the NCMC’s. The sintered powder mixture was examined by XRD patterns, the morphology of the obtained phase was observed by SEM and the phase compositions in different regions were analyzed by EDX. The composites were processed using Field Activated Sintering Technique, spark plasma sintering (SPS) at temperatures in the range of 1700-1800°C with addicting of SWCNTs. The effects of SWCNTs addition on phases morphology, microstructure hardness and fracture toughness of the nanocomposite were investigated. The best product contained 1.0 Wt% SWCNTs from (Mo2C)1-x–(TiC)x , x= 0.2 which was sintered at 1700°C, 70 MPa for 10 min, M0.8T0.2/ 1 Wt% SWCNTs exhibit a better density, highest hardness and good ductility. Relative densification was achieved 99.5 % from the theoretical and good mechanical properties like hardness and fracture toughness (KIC=5.6 Mpa m1/2) are improved. The results were confirmed using Raman scattering resonant spectroscopy.

Study of the Nanocomposite Mo2C(1-x)-TiC(x)-SWCNTs by Field Actived Sparck Plasma Sintering Process

Mar 2020 DOI 10.14302/issn.2689-2855.jan-20-3263
Bendjemil BadisCorresponding author DGM, FST, University of 8 Mai 1945 of Guelma, 24000 Guelma, Algeria

Nanocomposites are worn resistant materials used in cutting tool applications. The materials are composed of ultrafine powder hard phase grains surrounded by a tough binder phase carbon nanotubes (Mo2C)1-x–(TiC)x (2≤x≤4)//1Wt% SWCNTs. Composite bicarbide Mo2C-TiC was rapidly synthesised and simultaneously consolidated by field activated sintering technique (spark plasma sintering) at which the extensive volume expansion occurred as a function of the volumic fraction from 20 to 40 vol.% of TiC powders and 1 Wt.% of SWCNTs was reinforcement of the NCMC’s. The sintered powder mixture was examined by XRD patterns, the morphology of the obtained phase was observed by SEM and the phase compositions in different regions were analyzed by EDX. The composites were processed using Field Activated Sintering Technique, spark plasma sintering (SPS) at temperatures in the range of 1700-1800°C with addicting of SWCNTs. The effects of SWCNTs addition on phases morphology, microstructure hardness and fracture toughness of the nanocomposite were investigated. The best product contained 1.0 Wt% SWCNTs from (Mo2C)1-x–(TiC)x , x= 0.2 which was sintered at 1700°C, 70 MPa for 10 min, M0.8T0.2/ 1 Wt% SWCNTs exhibit a better density, highest hardness and good ductility. Relative densification was achieved 99.5 % from the theoretical and good mechanical properties like hardness and fracture toughness (KIC=5.6 Mpa m1/2) are improved. The results were confirmed using Raman scattering resonant spectroscopy.

Assessing Performance of Cattle Dung and Waste Cooked Foods in Producing Biogas as Single Substrate and Mixed Substrates in Kampala Uganda

Apr 2019 DOI 10.14302/issn.2377-2549.jndc-19-2701
J Mutesasira,Corresponding author External studies department, Institute of distance Education, Makerere University

Biogas is anaerobic degradation product formed from aqueous slurry of organic waste in a digester. It can be produced from cattle dung,(cd)chicken droppings, decaying leaves, kitchen waste foods(kwf), sewage sludge, slaughter house, goat, pig or sheep manure, Aqueous slurry of 200g/L of mixed or single substrate of cattle dung or/and kitchen waste evolved up to 400mL of biogas at ambient temperatures. The rate of gas evolution reached 5mL/day on the 15th day using 25% cd mixed slurry. The rates of degradation attained in the mixtures were 1.42ml/g for cd; 1.58mL/g for kwf; 1.78mL/g for 75% cd mixed substrate; 1.78mL/g for 50% cd mixed substrate; 1.92mL/g for 25% cd mixed substrate slurries. The comparative rate of biogas formation ranged from1.25 to 1.35 which was in agreement with the range published in literature of 0.8 to 5.5. Biogas can be synthesized efficiently at ambient temperature in Kampala as was done at mesophilic temperatures elsewhere. However, it may be necessary to attempt producing biogas at different pH and temperatures as well as using other substrates and inoculums.

The Comparison of Walking Performance in Cold and Warm Biologically Conditions in Physiology

Nov 2018 DOI 10.14302/issn.2578-8590.ipj-18-2493
Habibzadeh NasimCorresponding author PhD in Sport Science, Department of Sport Science, Teesside University, UK

Walking is the best possible exercise to promote fitness. However, ambient temperature has an impact on walking regimen and performing exercise in different biological conditions can be challenging tasks. For example, both cold and hot temperatures can impair walking performance. In fact, walking in different cold and warm ambient can be challenging physical activity. But suitable sport wears and drinks during walking performances can protect of the body in cold and warm conditions. In this relation, different cold and warm weathers although can challenge walking performance but they account for opportunities for body to adapt to the different seasonal conditions. Thus, performing regular walking in different cold and warm weathers can help individual to stay active as well as fit.

Energy Conservation Open Access

Flame Propagation Model and Combustion Phenomena: Observations, Characteristics, Investigations, Technical Indicators, and Mechanisms

Jul 2018 DOI 10.14302/issn.2642-3146.jec-18-2232
Aljerf LoaiCorresponding author Department of Basic Sciences, Faculty of Dental Medicine, Damascus University, Damascus, Syria

Critical conditions are usually obtained for ignition in a self-heating solid system consisting of two components generating heat independently, one component being inexhaustible and the other exhaustible by either simple first order or autocatalytic reaction. Ignition depends upon whether the exhaustible component can cause a temperature rise in excess of the upper stationary, but unstable, value possible for the inexhaustible component reacting alone. The system provides a theoretical model for some commonly occurring examples of self-heating and ignition in porous solids containing oxidisable oils. It is shown that: (a) the ignition criterion of the model, which involves a nonarbitrary critical temperature increase, has a high degree of physical reality; (b) the model is, in principle, capable of predicting ignition from primary kinetic and thermal data; (c) it is likely to be possible often to make a reliable prediction of critical size for self-ignition in a two-component system at ordinary atmospheric temperatures by a simple extrapolation from small-scale ignition data, obtained at higher temperatures, in the same way as for ignition due to a single reaction. Examination of both adiabatic and non-adiabatic flame theories showed that a 'steady state' exists only under the special condition that a heat sink exists at the initial temperature. For the general case of freely propagating, non-adiabatic flames only a quasi-steady state can be achieved.

Diurnal Variation in the Core Interthreshold Zone in Women and its Sex Difference

Apr 2018 DOI 10.14302/issn.2578-8590.ipj-18-2078
Kakitsuba NaoshiCorresponding author Department of Environment and Technology, School of Science and Technology, Meijo University, Nagoya, Japan

Background: The core interthreshold zone (CIZ) is defined as the range between core temperature (Tc) at the onset of shivering and the Tc at the onset of sweating under consistent mean skin temperatures of 28°C to 30°C. A previous study demonstrated a diurnal change in the CIZ for male subjects and its relationship to the cutaneous sensation threshold zone (CSZ). In the present study, diurnal changes in the CIZ and the CSZ for young Japanese female subjects were investigated using the same experimental protocol from the study of male subjects and the sex differences in these responses were then examined. Methods: The CIZ and the CSZ were measured in 10 female subjects who participated in three experiments in a single day during the morning, afternoon, and evening in the summer of 2014 (single-day experiment), and six female subjects who participated in the same experiments on the morning of day 1, the afternoon of day 2, and the evening of day 3 during the summer of 2016 (multiple-day experiment). Air temperature was controlled at 25°C. Each subject wore a suit perfused with 25°C water at a rate of 600 cc/min, and exercised at 50% of their maximum work rate on an ergometer for 10–15 min until their sweating rate increased. They then remained seated, without exercising, until their oxygen uptake increased. Rectal temperature, skin temperature at seven sites, the forehead-sweating rate, and oxygen uptake were continuously monitored throughout the experiment. Cutaneous warm and cold sensation thresholds were measured at three sites using 1-cm2 and 2-cm2 probes. Results: The results from the single-day experiment demonstrated that the CIZ was proportional to core temperature prior to exercise (Tc-init) whereas the results from the multiple-day experiment demonstrated that the CIZ increased continuously from morning to evening despite almost a constant Tc-init. The CIZ appeared to be proportional to the CSZ measured with the 2-cm2 probe. When compared with the results from the previous study of men, no significant sex difference was observed between the CIZ of 0.25±0.07°C for female subjects and 0.21±0.05°C for male subjects. Conclusion: No significant sex difference or diurnal variation in the CIZ was confirmed. Continuous increase in the CIZ from morning until evening is expected in both men and women under a normal Tc circadian rhythm.

Embryology Open Access

Reaction Norm of Embryo Growth Rate Dependent on Incubation Temperature in The Olive Ridley Sea Turtle, Lepidochelys Olivacea, from Pacific Central America

Dec 2017 DOI 10.14302/issn.3070-5657.je-17-1759
Girondot MarcCorresponding author Laboratoire Écologie, Systématique et Évolution (UMR8079), Faculté des Sciences d’Orsay, Université Paris-Sud, 91405 Orsay, France

Olive ridleys (Lepidochelys olivacea) and loggerheads (Caretta caretta) are two closely phylogenetically related sea turtles that nest in very different thermal habitat. Olive ridleys nest in pan-tropical beaches whereas loggerheads nest in more temperate beaches. In the context of climate change, the temperature in temperate beaches will increase much more than for tropical beach due to buffering effect of air humidity in the later. We have determined the thermal reaction norm for embryonic growth in both species using field records of incubation temperatures and incubation length from loggerheads in Western Mediterranean Sea or olive ridleys from Pacific coast of Guatemala. We show that the optimum temperature for the growth of embryos is lower for loggerheads than for olive ridleys. This makes loggerhead turtles particularly sensitive to increase of beach temperature as it is expected due to effect of global warming in temperature regions. Furthermore, olive ridleys are more resilient to increase of temperatures and should not suffer from sublethal incubation temperatures.

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