Wyniki wyszukiwania

1

A new four-parameter, generalized logistic equation and its applications to mammalian somatic growth

100%

Wan X., Wang M., Wang G., Zhong W.

Acta Theriologica

|

2000

|

tom 45

|

nr 2

A new mathematical equation is introduced in this paper: w = f - 1/(b/f +(1/(f-s)-b-f)exp(kt)) where W is the size at any convenient unit of time /, s is the initial size, f is the upper asympotic size, k is the growth coefficient (k > 0), and b is the constant. The new equation encompasses the logistic equation and therefore should be considered as a generalized version of the classical logistic equation. With its additional fourth parameter 6, the new equation yields an unfixed value of inflexion point which enables it to possess good flexibility for depicting diverse growth patterns. In order to evaluate the fitness of the new growth equation, some commonly encountered models are compared to the new one using 12 sets of somatic growth data of mammalian species including hamster, rat, vole, pika, mouse, rabbit, cattle, and bear, The new equation possesses excellent fitness to each data set, suggesting that it is worth being considered by growth data analysts.

2

Evaluation of the accuracy of the growth model for Scots pine

88%

Bruchwald A., Bosiak P.

Annals of Warsaw Agricultural University. Forestry and Wood Technology

|

1992

|

tom 43

3

Mean length increment ratio as an index describing length growth in selected fishes

88%

Szypula J.

Acta Scientiarum Polonorum. Piscaria

|

2006

|

tom 05

|

nr 1

4

Economic restructure and reform of growth model in Vietnam

75%

Cuong V. H.

Wieś i Rolnictwo

|

2013

|

nr 3

5

Applicability of bacterial growth models in spreadable processed cheese

75%

Weiss D., Kaczmarek A., Stangierski J.

Acta Scientiarum Polonorum. Technologia Alimentaria

|

2015

|

tom 14

|

nr 3

Background. Food spoilage is a process in which the quality parameters decrease and products are no longer edible. This is a cumulative effect of bacteria growth and their metabolite production, which is a factor limiting shelf life. Thus, the aim of the study was to evaluate whether microbiological growth models for total viable count (TVC) and Clostridium strain bacteria are reliable tools for prediction of microbiological changes in spreadable processed cheese. Material and methods. Investigations were conducted for two types of bacteria: TVC and Clostridium in following temperature: 8°C, 20°C and 30°C. A total number of aerobic bacteria was determined based on standard PN-EN ISO 4833:2004 and Clostridium was detected by using microbiological procedure for sulphite-reducing anaerobic spore-bacteria with a selective nourishment. During the analysis nonlinear regression and Baranyi and Roberts primary model were used. Results. For temperatures 20°C and 30°C, Baranyi and Roberts model, for total viable count showed determination coefficient of 70%. The models prepared for Clostridium, in these temperatures, showed much lower R2, respectively 25% and 30%. At the abovementioned temperatures also the expiration of product shelf life was much shorter and amounted 70 days at 20°C and 7 days at 30°C. For both types of bacteria incubated at 8°C the numbers of bacteria decrease until the expiration of product shelf life. Conclusions. Models used in the analyses, Baranyi and Roberts and nonlinear regression, poorly matched the experimental data, hence they are not reliable tools. Nevertheless, they gave information about dynamic of microbiological changes in spreadable processed cheese.

6

Limiting growth model for pine

75%

Bruchwald A.

Bulletin of the Polish Academy of Sciences. Biological Sciences

|

1991

|

tom 39

|

nr 2

7

Investigations on a d.b.h. growth function for Scots pine

75%

Bosiak P.

Annals of Warsaw Agricultural University. Forestry and Wood Technology

|

1992

|

tom 43

8

Further investigations on the accuracy of the growth model for Scots pine

75%

Bosiak P.

Annals of Warsaw Agricultural University. Forestry and Wood Technology

|

1992

|

tom 43

9

Age and growth of vendace, Coregonus albula (L.), from Lake Wigry (northeast Poland)

63%

Kozłowski K., Kozlowski J., Poczyczynski P., Martyniak A.

Archives of Polish Fisheries

|

2010

|

tom 18

|

nr 4

10

Scale radius growth versus standard length growth in some fish species

63%

Szypula J.

Archives of Polish Fisheries

|

2005

|

tom 13

|

nr 2

The growth of the scale radius was followed in seven fish species (roach, bream, rudd, humped rockcod, perch, halibut, and zander). The results obtained by analyzing a total of 11304 individuals were compared with corresponding data on the standard length growth of each species. The mathematical description of growth was done with the following six models: the von Bertalanffy equation, the Ford-Walford formula, the second order polynomial, the Gompertz model, the power function, and the modified power function. Data on length growth and length growth versus scale radius growth, which were used to determine the scale radius growth of each species, were taken from the literature. The growth of both the scale radius and body length of the species analyzed was fairly uniform: the increment ratios, averaged for the entire growth period, were close to 0.9. However, slightly higher values, hence more uniform growth, were recorded in radius growth (0.93) than in fish length growth (0.90). The fish length increments in the first two years of life were lower than the scale radius increments during the same time.

11

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Modelowanie wzrostu rozsady kapusty chińskiej (Brassica rapa var.chinensis) oraz ocena zależności między cechami roślin przed sadzeniem do gruntu i podczas zbiorów

63%

Kalisz A., Kostrzewa J.

Acta Agrophysica

|

2012

|

tom 19

|

nr 2

Przedstawiono wykorzystanie analizy regresji prostej do stworzenia modeli wzrostu rozsady kapusty chińskiej (Brassica rapa var. chinensis, pak choy) względem czasu, jak też do przewidywania rozwoju liści tych roślin na podstawie temperatur efektywnych (stopniodni). Opracowane modele czasowe charakteryzowały się wysokimi współczynnikami determinacji R2 wynoszącymi od 0,765 do 0,880 (dla wysokości rozsady) oraz od 0,964 do 0,970 (liczba liści). Dla temperatur efektywnych dopasowanie danych przewidywanych, dotyczących rozbudowy aparatu liściowego rozsady, do rzeczywistych wynosiło ponad 89%. Rozsadę produkowano w dwóch terminach, wysiewając nasiona na początku III dekady lipca (1. termin) i na początku sierpnia (2. termin). Rozsada przygotowywana w terminie późniejszym posiadała większą wysokość rozetek oraz powierzchnię i długość liści. Charakteryzowała się również większą świeżą masą części nadziemnej, jednocześnie niższą zawartością suchej masy, cukrów rozpuszczalnych i karotenoidów w porównaniu do 1. terminu. Stwierdzono istotne zróżnicowanie w analizowanych parametrach roślin ze względu na czynnik odmianowy. Cechy rozsady kapusty chińskiej były w dużej mierze skorelowane z cechami dojrzałych rozet oraz z plonem ogólnym tego warzywa.

12

Minimization of the relative error and variability coefficient at certain procedure for determination of the microorganisms' growth model parameters

63%

Cibis E.

Polish Journal of Food and Nutrition Sciences

|

2002

|

tom 11/52

|

nr 4

The aim of the present paper was to analyse relative errors and variability coefficients for estimated values of maximum specific growth rate (µmax) and saturation constant (Ks) in the Monod's growth model in the case when these values are determined on the basis of data from steady states of two chemostatic continuous cultures, and also on the basis of the above to propose the procedure for the dilution rate selection so that the analysed quantities attained minimum values. The above-mentioned relative errors and variability coefficients were analysed at assumption that the relative errors of determined values used for estimation, i.e. the dilution rate and substrate concentration in fermenter, are constant. It was found that in the analysed estimation method both relative error so as variability coefficient for saturation constant are higher than for maximum specific growth rate and that the relative errors and variability coefficients values for both estimated parameters are then minimum when one culture is carried on at possible low dilution rate and the second at the dilution rate close to the washout rate. It was also established that carrying on one continuous culture at the fixed in advance dilution rate it cannot be possible to always select the dilution rate of the second culture, so that the simultaneous minimization of relative error for µmax and Ks was possible. It also relates to the minimization of variability coefficient.

13

A model to determine quantitative effects of light and temperature on organic tomato seedlings

51%

Saribas H. S., Uzun S.

Acta Scientiarum Polonorum. Hortorum Cultus

|

2019

|

tom 18

|

nr 3

The present study was conducted to determine the quantitative effects of light and temperature on growth and development of organic tomato (Solanum lycopersicum L.) seedlings in a glasshouse under ecological conditions of Samsun Province of Turkey. Seedlings were grown in four different periods (seeds sown on 29 September for 1st period; 2 December for 2nd period; 18 March for 3rd period and 6 July for 4th period). In order to create different light intensities, shading material having a shading capacity of 50% in 1, 2 and 3 layers was used in each period after seeding. The effects of light and temperature on plant growth and development (leaf area, stomatal conductivity, leaf chlorophyll content, plant height, stem diameter and total plant vegetative dry weight) and the number of days from sowing to plantation of seedlings, were investigated. Obtained results revealed decreasing number of days from sowing to seedling plantation with increasing light intensities. Finally, the number of days from sowing to seedling plantation to be used in organic tomato seedling production was modeled based on the variations in temperature and light intensity (r2 = 0.92).

Ograniczanie wyników

A new four-parameter, generalized logistic equation and its applications to mammalian somatic growth

Evaluation of the accuracy of the growth model for Scots pine

Mean length increment ratio as an index describing length growth in selected fishes

Economic restructure and reform of growth model in Vietnam

Applicability of bacterial growth models in spreadable processed cheese

Limiting growth model for pine

Investigations on a d.b.h. growth function for Scots pine

Further investigations on the accuracy of the growth model for Scots pine

Age and growth of vendace, Coregonus albula (L.), from Lake Wigry (northeast Poland)

Scale radius growth versus standard length growth in some fish species

Modelowanie wzrostu rozsady kapusty chińskiej (Brassica rapa var.chinensis) oraz ocena zależności między cechami roślin przed sadzeniem do gruntu i podczas zbiorów

Minimization of the relative error and variability coefficient at certain procedure for determination of the microorganisms' growth model parameters

A model to determine quantitative effects of light and temperature on organic tomato seedlings