Temat: stress, - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Próby stressowego wywołania niedoboru metioniny i cystyny u szczurów dorosłych
Proby stresovogo vyzyvanija nedobora metionina i cistina u vzroslykh krys
Tests on induction of methionine and cystine deficiency in adult rats by stress condition
Autorzy:: Konieczna, W.
Powiązania:: https://bibliotekanauki.pl/articles/872408.pdf
Data publikacji:: 1963
Wydawca:: Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:: dieta niskobialkowa
metionina
poziom metioniny
cystyna
niedobory
czynniki stresowe
szczury
low protein diet
methionine
cystine
deficiency
stress factor
rat
Źródło:: Roczniki Państwowego Zakładu Higieny; 1963, 14, 6
0035-7715
Pojawia się w:: Roczniki Państwowego Zakładu Higieny
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Rozkład naprężeń w spoinie klejowej symetrycznej tarczy drewnianej
Raspredelenie naprjazhenijj v kleenom shove simmetricheskogo derevjannogo shhita
Distribution of stresses in a glue joint of symmetrical wooden shield
Autorzy:: Wilczynski, A.
Powiązania:: https://bibliotekanauki.pl/articles/798699.pdf
Data publikacji:: 1990
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:: naprezenia
rozklad
obliczenia
spoiny klejowe
tarcza drewniana
obciazenia
brzeg
cialo izotropowe
stress distribution
estimation
glue joint
Opis:: В статье рассматривается склееный параллельно волокнам стыковыми плоскостями деревянный щит составленный из трех элементов изготовленных из одного и того же вида древесины. Представляющий собой симметрическую механическую систему щит подвергался сжиму вызывающему срез шововых поперечных разрезов. Рассматривая древесину как упругое тело, были определены составные напряжения в щите при использовании теории упругости анизотропного тела, а также функции напряжений содержащей тригонометрический ряд. В связи с малой толщиной клеевого шова было оставлено вне учета его влияние на деформации и напряжения в щите. Исчисляли аначения срезывающих и нормальных напряжений в клеевом шове для щитов изготовленных из трех видов древесины: сосновой, буковой и дубовой, а для сравнения также из изотропного материала. Учитывали также изменчивую геометрию щита связаннцю с различными ширинами его боковых частей и его разную высоту. Графически представлены распределения напряжений в клеевом шове для отдельных материально-геометрических случаев. Труд заканчивается анализом результатов пополненным выводами.
The wooden shield glued parallelly to fibres by tangent planes from three elements made from the same wood kind is presented in the paper. The shield of symmetrical mechanical arrangement was subjected to compression causing shear of the joint cross section. While regarding wood as an elastic body, the stress components in the shield were determined basing on the anisotropic body elasticity theory and making use of the stress function containing a trigonometric series. In view of a very small glue joint thickness, its effect on deformations and stresses in the shield was disregarded. Values of shearing and normal stresses in the glue joint for shields made from pine, beech and oak wood and for comparison - from isotropic material were calculated. Also variable geometry of the shield resulting from different widths of its lateral parts and from its different heights. Stresses distribution in the glue joint for particular material and geometry cases are presented graphically. The work is finished by the analysis of results supplemented with conclusions.
Źródło:: Zeszyty Problemowe Postępów Nauk Rolniczych; 1990, 379
0084-5477
Pojawia się w:: Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Wplyw wlasciwosci mechanicznych ziarna pszenicy na rozklad obciazenia w zbiorniku
Load distribution in a model bin as influenced by mechanical properties of wheat grain
Autorzy:: Horabik, J
Powiązania:: https://bibliotekanauki.pl/articles/1628324.pdf
Data publikacji:: 1994
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: agrofizyka
pszenica
ziarno
materialy sypkie
wlasciwosci mechaniczne
badania modelowe
naprezenia
obciazenia statyczne
obciazenia dynamiczne
rozklad obciazen
zbiorniki cylindryczne
anizotropia
agrophysics
wheat
grain
granular material
mechanical property
model research
stress
static load
dynamic load
load distribution
cylindrical bin
anisotropy
Opis:: To describe mechanical behaviour of a granular material it is indispensable to have parameters such as the coefficient of friction on a bin wall, the angle of internal friction and the bulk density and the k-value in Janssen's equation. The values of these parameters depend on many known and unknown factors. In the case of plant granular solids indisputable is the role of moisture content of grain, vertical pressure and sliding velocity. The purpose of this study was to determine the influence of mechanical properties of wheat grain on wall and bottom load distribution in a model grain bin. A series of tests involving eight filling methods, eccentric discharge from five different locations of a bin orifice and three bin wall surfaces were conducted on a laboratory scale cylindrical bin 0.61 m in diameter and 2.44 m high. The wall and flat floor of the bin were supported independently on three load cells so that load distributions could be isolated. Static and dynamic wall and bottom loads were found to be influenced by the filling method. Shower filling produced lower static load of the smooth wall as compared to central filling and higher static load of corrugated and rough walls. The experiments showed a significant influence of grain orientation on load distribution. Variable angle of internal friction within the Janssen differential element can explain the non-uniform load distribution obtained. The horizontal bending moments exerted on the wall and floor of the bin during eccentric discharge were found to decrease with an increase in the bin wall friction coefficient and were influenced significantly by the orifice eccentricity ratio, with the maximum moment occurring at ER equal to 0.667. The horizontal pressure distribution around the circumference of the bin wall depends on the height from the floor. Near the floor of the bin the horizontal pressure was larger on the side of the bin opposite the discharge orifice, while for locations higher above the floor, the horizontal pressure was larger on the side nearest the discharge orifice. As the ratio of the grain height to the bin diameter decreased below approximately 1 a change in the direction of the resultant friction force on the bin wall from a normal downward direction to an upward direction was observed. The change in direction of the resultant tangent force originates from the combination of the downward friction force of flowing grain and the upward friction force of the grain contained within the dead zone of the bin. Moisture content of grain influences its compressibility, friction against the bin wall, height of the dead zone and, in consequence, the upward movement of grains in the dead zone of the flat bottom bin during discharge.
Źródło:: Acta Agrophysica; 1994, 01; 71
1234-4125
Pojawia się w:: Acta Agrophysica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Wplyw zlokalizowanego stresu tlenowego w glebie na rozwoj korzeni i czesci nadziemnych kukurydzy [ modelowe badania rizotronowe ]
Effect of localized soil oxygen stress on root and shoot development in maize ( a model rhizotrone study)
Autorzy:: Bennicelli, R P
Powiązania:: https://bibliotekanauki.pl/articles/1628361.pdf
Data publikacji:: 1994
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: agrofizyka
gleby
kukurydza
system korzeniowy
wzrost roslin
badania modelowe
badania rizotronowe
dynamika rozwoju
powietrze glebowe
aeracja
stres tlenowy
agrophysics
soil
maize
root system
plant growth
model research
development dynamics
soil air
aeration
oxygen stress
Opis:: The aim of the study was to test the usefulness of split rhizotrone technique to investigate the effect of localized soil anoxia on root and shoot developement, using maize as a test plant. The experiment was performed in 6 split rhizotrons enabling differentiation of soil aeration status in each half of the rhizotron by blowing nitrogen or air through them. The rhizotrone consists of two parts (each 16.6 dm3 in volume) inclined with an angle 60°. Each part is constructed of 1 mm thick stainless steel plate with a glass inner wall for root observation and has dimensions 84 cm x 40.5 cm x 5.0 cm. The rhizotrons were filled in with a brown loess soil material (Eutric Camhisol) from Ap horizon (from Eli/6wka, near Lublin). Maize seedlings with the roots splitted between the rhizotrone halves (eukivars KLG 2210 and DEA) were used in the experiments. Until the stress period the soil moisture tension of 20-80 kPa provided good water and air conditions. At a stage of 8 leaves three treatments were applied for a period of 7 days; an oxic control (P/P), a localized anoxia with 50% of the roots in nitrogen treated part (P/A), and a complete anoxia (A/A) with gas nitrogen in both parts. During the stress period diurnal elongation rates of primary roots (by marking positions of the tips each day) as well as distribution of two indicators of soil oxygenation status with depth viz. of oxygen diffusion rate (ODR) and of redox potential (Eh) in soil were measured. Shoot elongation rates were monitored with a potentiometer attached to the youngest leaf. Microscopic photographs of cross- sections of the caps and of apical meristems of primary roots at 400 magnification were made to show the changes in their anatomy due to anoxia. Chemical analysis of the shoots was performed after the stress period. For each cultivar the experiment was repeated three times. The investigations performed allowed the following conclusions to be drown out: 1. The split rhizotrone was shown to be a useful technique to study behaviour of the primary maize roots under localized anoxia conditions. 2. The ODR and Eh distribution with depth showed deterioration of oxygenation status (drop of ODR from control values above 100 |µg m-2 s-1 to the level 30 µg m-2 s-1, decrease of Eh from control values above 550 mV to the level, 300 mV) due to replacement of the soil air with gaseous nitrogen. 3. Root elongation rates under anoxic conditions (both under complete - A/A, and localized - A/P anoxia) were on the level of about 50% of the controle (P/P) during first 4 days and decreased practically to zero by the end of the stress period. In turn, the oxic part of the rhizotrone combined with localized anoxia treatment of the same plant (P/A) exhibited compensation effect and was characterized by stimulation of the root elongation rate up to 80%. This effect was especially distinct after 2-5 days of the stress duration and then tended to decrease. 4Distribution of the root mass in depth under anoxic treatments was characterized by concentration of about 80% of the root mass within first 10 cm of the soil. 5.Microscopic photographs of the root tips showed, under anoxic conditions, shorter meristematic zone, smaller number of mitosis, beginning of aerenchyma formation and dying of the cells at a distance of 1 mm from the root cap. 6.The shoots responded to applying anoxia to both rhizotrone parts by 20% reduction of the growth rate. 7.Both root and shoot elongation rates were correlated also with the temperature. 8.Oxygen deficiency in soil resulted in an increase of exchangeable manganese, what was reflected by its increased concentration in the maize shoots.
Źródło:: Acta Agrophysica; 1994, 03; 3-72
1234-4125
Pojawia się w:: Acta Agrophysica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Adrenergic regulation of the hypothalamic-pituitary-adrenal axis under basal and social stress conditions
Autorzy:: Bugajski, J
Gadek-Michalska, A.
Olowska, A.
Borycz, J.
Glod, R.
Bugajski, A.J.
Powiązania:: https://bibliotekanauki.pl/articles/70018.pdf
Data publikacji:: 1995
Wydawca:: Polskie Towarzystwo Fizjologiczne
Tematy:: prazosin
vasopressin
yohimbine
in vitro
rat
adrenergic regulation
hypothalamic-pituitary-adrenal axis
adrenergic receptor
isoproterenol
corticosterone
phenylephrine
propranolol
adrenergic neuron
crowding stress
Źródło:: Journal of Physiology and Pharmacology; 1995, 46, 3
0867-5910
Pojawia się w:: Journal of Physiology and Pharmacology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Effect of stress on stereological parameters of polished sections of soil samples
Autorzy:: Guc, A.
Czachor, H.
Konstankiewicz, K.
Powiązania:: https://bibliotekanauki.pl/articles/24170.pdf
Data publikacji:: 1995
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: grain size
soil aggregate
distribution
stress
stereology
image analysis
Źródło:: International Agrophysics; 1995, 09, 4
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Image analysis as the quantitative estimation of the structure of agricultural materials
Autorzy:: Haman, J.
Konstankiewicz, K.
Pukos, A.
Powiązania:: https://bibliotekanauki.pl/articles/26257.pdf
Data publikacji:: 1995
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: statistical method
soil structure
deterministic method
structure
agricultural material
soil pore
stochastic method
probabilistic method
stress measurement
image analysis
agrophysics
Źródło:: International Agrophysics; 1995, 09, 4
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Soil stress state determination under static load
Autorzy:: Pytka, J.
Horn, R.
Kuhner, S.
Semmel, H.
Blazejczak, D.
Powiązania:: https://bibliotekanauki.pl/articles/25639.pdf
Data publikacji:: 1995
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: soil structure
erosion
stress distribution
physical property
intensification
soil stress
crop production
physical degradation
static load
Źródło:: International Agrophysics; 1995, 09, 3
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Compression of berry-like cell between two plates - role of internal stress
Autorzy:: Blahovec, J.
Posva, J.
Powiązania:: https://bibliotekanauki.pl/articles/25043.pdf
Data publikacji:: 1996
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: internal structure
berry-like fruit
compression
internal stress
membrane
plant cell
fleshy fruit
plant tissue
Źródło:: International Agrophysics; 1996, 10, 2
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Genotypic variation in response to iso-osmotic and soil moisture stresses among old and modern cultivars of winter wheat
Autorzy:: Mendel, M
Gorny, A G
Powiązania:: https://bibliotekanauki.pl/articles/2047709.pdf
Data publikacji:: 1996
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Triticum spelta
drought stress
mannitol
wheat
soil
old cultivar
transpiration
moisture stress
Triticum aestivum
modern cultivar
root
Opis:: The study was performed to evaluate range of the genotypie variation in drought susceptibility at juvenile growth stages among 23 old and modern winter cultivars of Triticum aestivum and one old cv. of T. spelta. Response of germinated seeds to mannitol-simulated drought stress as well as that in seedling shoot and root growth, water use and leaf transpiration under varied soil moisture were measured. Considerable genotypie variation for all morpho-physiological traits was found between wheat cultivars. There were significant differences between the older and modern cultivars. The former showed usually an enhanced rooting ability and higher water requirements, while the newer indicated more efficient water use. The older cultivars were more resistant to both iso-osmotic stress and low soil moisture at the juvenile growth stage. However, no clear differences were found between the two groups of cultivars in the variation range of the drought susceptibility indices. Complex patterns of the response to drought were observed. Cultivars, which distinguished by both a lower shoot : root ratio and a stronger drought-induced stimulative root growth, tended to be more resistant. Although only moderate the relationships noticed, a consideration of the root plasticity screening in local wheat breeding appears to be justified.
Źródło:: Journal of Applied Genetics; 1996, 37, 1; 49-63
1234-1983
Pojawia się w:: Journal of Applied Genetics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Resistance of wheat seeds influenced by tensile forces and electrostatic field
Autorzy:: Adamkiewicz, J.
Pietrzyk, W.
Zlonkiewicz, Z.
Scibisz, M.
Powiązania:: https://bibliotekanauki.pl/articles/25708.pdf
Data publikacji:: 1996
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: wheat
grain
electrostatic field
resistance
stress
seed
Źródło:: International Agrophysics; 1996, 10, 4
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: The model CORNWAY - a tool for analysingn the relation between soil-water regime and the yield of maize [Zea mays L.]
Autorzy:: Majercak, J.
Novak, V.
Vidovic, J.
Powiązania:: https://bibliotekanauki.pl/articles/24194.pdf
Data publikacji:: 1996
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: CORNWAY model
Zea mays
soil water
corn
grain yield
GLOBAL model
stress factor
yield
water regime
maize
Źródło:: International Agrophysics; 1996, 10, 4
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Yield prediction for winter wheat in Eastern Poland [Grabow] using the access-II model
Autorzy:: Henric, J.F.
Legros, J.P.
Slawinski, C.
Walczak, R.T.
Powiązania:: https://bibliotekanauki.pl/articles/25677.pdf
Data publikacji:: 1996
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: root length
biomass calculation
Polska
Grabow
modelling
winter wheat
soil evaporation
ACCESS-II model
leaf growth
yield prediction
wheat
plant transpiration
stress
water content
Źródło:: International Agrophysics; 1996, 10, 3
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Acoustic emission as a method for the detection of fractures in the plant tissue caused by the external forces
Autorzy:: Zdunek, A.
Konstankiewicz, K.
Powiązania:: https://bibliotekanauki.pl/articles/25704.pdf
Data publikacji:: 1997
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: potato tissue
deformation
stress level
acoustic emission
mechanical parameter
cell structure
plant tissue
Źródło:: International Agrophysics; 1997, 11, 3
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Mechanical properties of pea seed coat
Autorzy:: Dobrzanski, B.
Szot, B.
Powiązania:: https://bibliotekanauki.pl/articles/25136.pdf
Data publikacji:: 1997
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: seed quality
drying
temperature
deformation
moisture content
pea
stress
mechanical property
seed
coat
Źródło:: International Agrophysics; 1997, 11, 4
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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