Search results for " Temperature"

Maksimālo un minimālo gaisa temperatūru diennakts svārstību amplitūdas un to ilglaicīgās izmaiņas Latvijā 1951. - 2016. gads

2019

Bakalaura darba tēma ir “Maksimālās un minimālās gaisa temperatūru svārstību amplitūdas un to ilglaicīgās izmaiņas Latvijā 1951.-2016.gads”. Tika ievākti un analizēti dati no 18 Latvijas meteoroloģiskajām stacijām, kas ļauj izvērtēt iegūtās likumsakarības atšķirīgos fizioģeogrāfiskos novietojumos esošu meteoroloģisko staciju ilggadīgos novērojumus. Bakalaura darba mērķis ir izvērtēt maksimālo un minimālo gaisa temperatūru diennakts svārstību amplitūdas un to izmaiņas atšķirīgos fizioģeogrāfiskos novietojumos Latvijā laika posmā no 1951.-2016. gadam. Darba gaitā 18 novērojumu stacijas tika iedalītas divās grupās -piekrastes un kontinentālās novērojumu stacijās. Iegūtie rezultāti liecina, ka …

Incubation behaviour of Great Tits Parus major in response to ambient temperature in three contrasting Mediterranean habitats

2021

Esta tesis fue leída el 14 de junio de 2021 en la Universidad de Valencia y forma parte del Doctoral Program in Biodiversity and Evolutionary Biology (RD 99/2011) del Departamento de Zoología de la Facultad de Ciencias Biológicas de dicha universidad.-168 pp.-

Applying anaerobic digestion for onsite treatment of domestic wastewater and biowaste at low temperature in Finland - considering the Chinese experie…

2009

A contribution to the study of staling of white bread: effect of water and hydrocolloid

1996

Abstract Staling of white bread at ambient temperature was studied using differential scanning calorimetry and dynamic mechanical thermal analysis. During storage, sample hydration varied slightly, from 0 to 0.4% per day, depending on packaging conditions. An increase in rigidity was observed, which was attributed both to starch retrogradation and to changes in the organization of the amorphous part of crumb. The glass transition temperature of crumb was not significantly modified by these structural changes. Hydrocolloids did not affect the overall shape of the viscoelastic behavior of crumb in the temperature range from −40°C to 80°C, and had a limited influence on the kinetics of starch …

Synthesis of heat-shock proteins in developing sea urchins.

1981

Heating sea urchin embryos at 31°C greatly reduces the synthesis of the bulk proteins, whereas it highly stimulates the synthesis of some new proteins, the main ones being two closely migrating proteins of about 70,000 daltons. The production of heat-shock proteins is obtained only if the embryos are heated after hatching. Stages which produce heat-shock proteins survive heating, whereas earlier stages, not producing heat-shock proteins, do not survive. Heat-shock proteins are not produced in the presence of actinomycin D.

Sea urchin deciliation induces thermoresistance and activates the p38 mitogen-activated protein kinase pathway.

2003

In this study, we demonstrate by a variety of approaches (ie, morphological analysis, Western blots, immunolocalization, and the use of specific antibodies) that hyperosmotic deciliation stress of sea urchin embryos induces a thermotolerant response. Deciliation is also able to activate a phosphorylation signaling cascade the effector of which might be the p38 stress-activated protein kinase because we found that the administration of the p38 inhibitor SB203580 to sea urchin deciliated gastrula embryos makes the hyperosmotic deciliation stress lethal.

Achievement of thermotolerance through hsps phosphorylation in sea urchin embryos.

1995

TPA treatment of sea urchin embryos is able to induce thermotolerance. Evidence is provided that TPA treatment induces phosphorylation of a constitutive stress protein of 38 KDa.

Passive sinking into the snow as possible survival strategy during the off-host stage in an insect ectoparasite

2015

Abiotic and biotic factors determine success or failure of individual organisms, populations and species. The early life stages are often the most vulnerable to heavy mortality due to environmental conditions. The deer ked (Lipoptena cervi Linnaeus, 1758) is an invasive insect ectoparasite of cervids that spends an important period of the life cycle outside host as immobile pupa. During winter, dark-coloured pupae drop off the host onto the snow, where they are exposed to environmental temperature variation and predation as long as the new snowfall provides shelter against these mortality factors. The other possible option is to passively sink into the snow, which is aided by morphology of …

Temperature effect on solubility of aroma compounds in various aqueous solutions

2005

International audience; Solubility of nine aroma compounds (methyl ketones, ethyl esters, aldehyde and alcohol) in various aqueous solutions was measured by the mutual solubility method from -10 to +10degreesC. Influence of both, the nature (carbohydrates and polyols) and the substrate concentration (from 0 to 57.5g/100g) on aroma solubility in aqueous solutions was studied. Aroma solubility in water decreased when aroma hydrophobicity increased. Aroma solubility in various aqueous solutions decreased when substrate concentration increased; their solubility was higher in polyols solutions than in polysaccharides ones. Temperature effect on aroma solubility showed a noncontinuous evolution f…

Ferromagnetic ordering in GdPdCd

2010

Abstract GdPdCd was obtained in pure form via reaction of the elements in a sealed tantalum tube in a high-frequency furnace. The structure was investigated by X-ray diffraction on both powders and single crystals: ZrNiAl type, P 6 2m , a=758.2(1), c=391.78(7) pm, wR2=0.0410 for 358 F2 values and 14 variables. Striking structural motifs of GdPdCd are two types of palladium-centered tricapped trigonal prisms [Pd1Cd3Gd6] and [Pd2Cd6Gd3]. Together the palladium and cadmium atoms build a three-dimensional network in which the gadolinium atoms fill distorted pentagonal channels. Susceptibility measurements reveal Curie–Weiss behaviour with an effective magnetic moment of 8.2(1) μB/Gd. GdPdCd ord…