Wszystkie pola: Chlorophyll-a - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Modelling of chlorophyll-a content in running waters
Modelowanie zawartości chlorofilu-a w wodach płynących
Autorzy:: Neverova-Dziopak, E.
Kowalewski, Z.
Powiązania:: https://bibliotekanauki.pl/articles/125801.pdf
Data publikacji:: 2016
Wydawca:: Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:: eutrophication
chlorophyll-a
running waters
prediction models
eutrofizacja
chlorofil a
wody płynące
modele predykcyjne
Opis:: Chlorophyll-a is one of the key parameters for assessment of trophic status of surface waters. However, Polish standard environmental monitoring procedures assume a low frequency of chlorophyll measurements in running waters, which does not provide the possibility of permanent control of eutrophication process and taking the appropriate preventive and protective measures sufficiently in advance. The article is focusing on constructing of predicting model of chlorophyll-a content based on data obtained within monitoring realized by Regional Inspectorates for Environmental Protection. Multivariate linear regression (MLR) model for chlorophyll-a content prediction was formulated on the base of chosen parameters like: pH, oxygen saturation, different forms of nitrogen and phosphorus. Formulation of the model was followed by a test of the applicability of each of the individual components of the regression equation. The main purpose was to develop an algorithm allowing for quick adaptation of model to local conditions in the rivers in order to make a reliable prediction of chlorophyll content.
Chlorofil-a jest jednym z kluczowych parametrów służących do oceny stanu troficznego wód. W Polsce w ramach standardowego monitoringu rzek jest jednak badany rzadko. Artykuł skupia się na skonstruowaniu modelu predykcji zawartości chlorofilu-a w oparciu o dane pochodzące z rutynowego monitoringu realizowanego przez Wojewódzkie Inspektoraty Ochrony Środowiska. W tym celu na podstawie parametrów jakości wód, takich jak pH, nasycenie tlenem oraz różne formy azotu i fosforu, został sformułowany model regresyjny, a następnie przeprowadzono test zasadności zastosowania w nim poszczególnych składników równania regresji. Ostatnim etapem było opracowanie algorytmu pozwalającego na szybkie dostosowywanie modelu do lokalnych warunków w rzekach w celu dokonania wiarygodnej prognozy zawartości chlorofilu.
Źródło:: Proceedings of ECOpole; 2016, 10, 2; 455-462
1898-617X
2084-4557
Pojawia się w:: Proceedings of ECOpole
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Spatial and temporal distribution of sea surface chlorophyll-a front in Java Sea, Indonesian Waters
Autorzy:: Kholifatul, Aziz
Sunarto, Sunarto
Syamsuddin, Mega
Yuliadi, Lintang
Powiązania:: https://bibliotekanauki.pl/articles/1046555.pdf
Data publikacji:: 2019
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Chlorophyll-a front
Indonesian waters
Java Sea
monsoonal wind
Opis:: A chlorophyll-a front is a border between two water masses with chlorophyll-a concentration gradient 0.15-0.5 mg/m3. Such masses and the related interface are usually located near the northern, western and southern coastal parts of the Javal Sea (between 3º S - 5º S and 110º E - 116 º E, 3º S - 5º30’ S and 106º E - 107º E, 5º S – 7º30’ S and 116º E - 114º E), and are strongly influenced by the northwest monsoonal winds system. In this work, we used the Single Image Edge Detection (SIED) Algorithm to detected the frontal face. The gradient level we used to designate the passing from and into a front was 0.5 mg/m3. Monthly data of the chlorophyll-a image, sea surface current imagery and rainfall levels from January to December 2015 were used in this study. From this data, we discovered that the monthly average of the lengths of the chlorophyll-a front ocurrence reaches a greatest extent in March with 2513.64 km and a least extent at 510.25 km in October. In addition, the fronts move closer to the coastal area during the transitional I to transitional II period. Our data suggest that surface current affects frontal movement. Moreover, the number of succeeding fronts and the intensity of change are influenced by nutrient supply from rivers that is, in turn, affected by rainfall level. This is because the rainfall data shows a similar pattern with temporal front data.
Źródło:: World Scientific News; 2019, 137; 70-80
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Seasonal Driven Mechanism of the Surface Chlorophyll-A Distribution along the Western Coast of Sumatra
Autorzy:: Sari, Qurnia Wulan
Siswanto, Eko
Utari, Putri Adia
Saputra, Okta Fajar
Lestiana, Hilda
Holidi
Subiyanto
Yuniarti
Iskandar, Iskhaq
Powiązania:: https://bibliotekanauki.pl/articles/2202258.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: coastal
equatorial wind
MODIS
Sumatra
surface chlorophyll-a
Opis:: The chlorophyll-a (chl) abundances on the Fisheries Management Area of Indonesia Republic (WPP-RI 572), as fishery resources over the western coast of Sumatera (WSC) and Sunda Strait, were examined in this study. The extensive investigation on the mechanism ocean dynamics on chl variability along WSC was observed by using remotely sensed data on the surface. The spatial analysis was conducted using the Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua Ocean colour data for a period of January 2003 to December 2015. On seasonal time scale, the surface chlorophyll-a (schl) concentration in the southern tip of Sumatra is higher than the schl in the northern tip of Sumatra. The obtained results showed that the schl concentration in the southern tip of Sumatra increases (decreases) during the southeast (northwest) monsoons. Interestingly, its interactions with the southeast monsoon wind result in intensified coastal upwelling along the monsoon trough in July – August. It triggered a large bloom of the schl concentration from the upwelling region of southern tip Sumatra. Moreover, the schl in the center region followed the peak of the equatorial wind during the period transition in the Indian Ocean which is controlling the dynamics ocean such as upwelling event. Meanwhile, the opposite situation of the schl concentration observed low along the western coast of Sumatra during the northwest monsoon. At the same time, strong upwelling observed at the northern tip of Sumatra was associated with intense cooling on the sea surface temperature. It triggered a large bloom of high schl water from the upwelling region of northern Sumatra Island.
Źródło:: Journal of Ecological Engineering; 2022, 23, 11; 254--260
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Cadmium Toxicity Towards Marine Diatom Thalassiosira sp. and its Alteration on Chlorophyll-a and Carotenoid Content
Autorzy:: Wahyu, Dionisius
Hindarti, Dwi
Permana, Rega
Powiązania:: https://bibliotekanauki.pl/articles/1031551.pdf
Data publikacji:: 2020
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Cadmium
Carotenoid
Chlorophyll-a
Thalassiosira sp
Opis:: Cadmium is one of the non-essential metals that have toxic effects on aquatic organisms, including diatoms. Diatoms play significant important roles in the aquatic environment, hence, the presence of cadmium will have a significance growth inhibition to its abundance. In this paper, we tried to clarify the effects of cadmium on growth, chlorophyll-a and carotenoid contents of the diatom Thalassiosira sp. Growth inhibition of the phytoplankton was determined following exposure for 96h to several different concentrations of cadmium solutions in an experiment adapted from ASEAN-Canada CPMS II. Our work shows that IC50 of growth and chlorophyll-a was around 0.32 mg/L and 0.914 mg/L, respectively. In addition, Lowest Observed Effect Concentration (LOEC) and No Observed Effect Concentration (NOEC) were 0.18 mg/L and 0.1 mg/L, respectively. In conclusion, cadmium inhibits the growth, as well as the photosynthetic pigment contents of Thalassiosira sp.
Źródło:: World News of Natural Sciences; 2020, 31; 48-57
2543-5426
Pojawia się w:: World News of Natural Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Fluorescence parameters of chlorophyll a halophytes as a response to salinity of post mining subsidence reservoirs
Autorzy:: Sierka, Edyta
Bujok, Michał
Stalmachova, Barbara
Horaczek, Tomasz
Powiązania:: https://bibliotekanauki.pl/articles/2203574.pdf
Data publikacji:: 2022
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: chlorophyll a fluorescence
climate change
halophyte
Najas marina
salinity
Opis:: The increasing salinity of water in reservoirs is caused by climate change. On the other hand, an increase in salinity promotes the group species, halophytes that tolerate or need NaCl for growth. The aim of this study was to identify the response of facultative halophytes’ photosynthetic apparatus efficiency (PE) to water salinity. The study covered the spiny water nymph (Najas marina L.) population in four mining subsidence reservoirs. Najas marina is a facultative halophyte which means that it can occur in both fresh and salt water. This plant has the characteristics of the species invasive, such as rapid biomass growth, and wide ecological tolerance. Water salinity, described by conductivity, in the reservoirs ranged from 646 to 3061 μS∙cm -1. PE was expressed in terms of chlorophyll a fluorescence parameters, which were collected in situ using a Pocket PEA device. Water parameters using a YSI ProDSS probe were identified. Data analysis was performed using OJIP test and s the non-parametric Spearman’s rank test (p ≤ 0.05). The relationship between chlorophyll a fluorescence parameters and water parameters showed that conductivity, salinity, water clarity, and nitrate content statistically significantly affected PE (p <0.05). Generally, the higher salinity e.g. more than 3000 μS∙m -1, supports PE of facultative halophyte at the stage of optimum development in the vegetation season.
Źródło:: Journal of Water and Land Development; 2022, Special Issue; 164--170
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Chlorophyll a Fluorescence and Absorption in Two Chlamydomonas Species
Fluoroscencja i absorpcje chlorofilu a dwóch gatunków Chlamydomonas
Autorzy:: Friedrich, S.
Spukerman, E.
Powiązania:: https://bibliotekanauki.pl/articles/388349.pdf
Data publikacji:: 2009
Wydawca:: Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:: Chlamydomonas reinwardtii
Chlamydomonas acidophila
ekologia wód słodkich
fluorescencja chlorofilu a
absorpcja chlorofilu a
pomiary in vivo
pomiary in vitro
wzrost
produkty rozkładu
sondy wieloparametrowe
HPLC
Chlamydomonas reinhardtii
freshwater ecology
chlorophyll a fluorescence
chlorophyll a absorption
in vivo measurements
in vitro measurements
growth
degradations products
multiparameter probe
Opis:: Phytoplankton densities in lakes and oceans are often measured via in vivo chlorophyll a (Chl a) fluorescence. This quick and non-invasive method has large advantages over traditional sampling and extraction methods. Here we hypothesize that measurements of in vivo fluorescence might overestimate the actual Chl a concentration when algal cells contain relatively high concentrations of Chl a degradation products, as a result of reaching the stationary phase in growth or living in a stress-full environment. Therefore the in vivo and in vitro fluorescence of Chl a was measured in two species of Chlamydomonas and compared with total Chl a content. Regular sampling over the full range of their growth curves was obtained. Chlamydomonas reinhardtii was selected as a species living in neutral, non-stressed environments and Chlamydomonas acidophila inhabits very acidic (pH 2.0-3.4), stress-full environments. Scattering of fluorescence during in vivo measurements resulted in an on average 25-fold lower Chl a concentration compared with in vitro measurements in both species. Cells of C. reinhardtii scattered approx. 1.5-fold more of the in vivo fluorescence than C. acidophila. The cellular Chl a content incrcased during the first fortnight period in both Chlamydomonas species. After reaching its maximum, the cellular Chl a content decreased with time in both species. This decrease was not accompanied by an increase of Chl a degradation products. The percentage of Chl a degradation products to total Chl a concentration was not significantly different between C. acidophila and C. reinhardtii; both species containing approximately 16 % of Chl a degradation products to total Chl a, Only 73-80 % of the concentration of Chl a measured by the in vitro fluorometric method was recovered in the HPLC. Therefore, despite the settings of the fluorometer, fluorescence possibly overestimated the Chl a concentration. In conclusion we find that external low pH or stationary growth does not result in increased concentrations of degradation products of Chl a. In addition, the extrapolation from the in situ detection of Chl a fluorescence with multiparameter sensors to concentrations of Chl a must be performed with great care as the use is subject to species-specific scattering of the fluorescence signal.
Zagęszczenia fitoplanktonu w jeziorach i oceanach często jest mierzone in vivo za pomocą fluorescencji chlorofilu a (Chl a). Ta szybka i nieinwazyjna metoda ma dużą przewagę nad tradycyjnymi metodami pobierania próbek i ekstrakcji. W tej pracy badamy hipotezę, że pomiary in vivo fluorescencji rzeczywistego stężenia Chl a mogą prowadzić do zawyżonych ocen stężeń, jeśli komórki glonów zawierają stosunkowo duże stężenia produktów rozpadu Chl a w wyniku osiągnięcia stanu stacjonarnego wzrostu lub w wyniku przebywania w środowisku zawierającym wiele czynników stresowych. Zmierzono fluorescencję Chl a in vivo i in vitro dla dwóch gatunków Chlamydomonas i porównano z całkowitą zawartością Chl a. Uzyskano próbki w pełnym zakresie ich krzywej wzrostu. Chlamydomonas reinhardtii został wybrany jako gatunek żyjący w warunkach naturalnych, nie stresowych, a Chlamydomonas acidophila zamieszkuje stresogenne, bardzo kwaśne środowisko (pH 2,0-3,4). Rozpraszanie fluorescencji w czasie pomiarów in vivo wskazywało na średnio 25-krotnie mniejsze stężenie Chl a w porównaniu z pomiarami in vilro dla obu gatunków. W warunkach in vivo komórki C. reinhardtii rozpraszały ok. l ,5-krotnie silniej niż C. acidophila. W okresie pierwszych dwóch tygodni eksperymentu zawartość Chl a w komórkach rosła u obu gatunków Chlamydomonas. Po osiągnięciu maksimum zawartość Ch! a zmniejszała się z czasem u obu gatunków. Stosunki zawartości produktów rozpadu Chl a do całkowitej zawartości Chl a nie różniły się statystycznie istotnie pomiędzy C. acidophila i C. reinhardtii. Oba gatunki zawierały około 16 % produktów degradacji Chl a w stosunku do całkowitego jego stężenia. Tylko 73-80 % stężenia Chl a mierzonego metodą fluory-metryczną in vitro zostało oznaczone za pomocą HPLC. Dlatego też, niezależnie od ustawienia fluorymctru, metoda fluorescencyjna prawdopodobnie zawyża stężenie Chl a. W rezultacie okazuje się, że niskie zewnętrzne pH lub stacjonarna równowaga wzrostu nie powodują zwiększenie stężenia produktów rozkładu Chl a. Ponadto ekstrapolacje fluorescencyjnego wykrywania Chl a in situ za pomocą czujnika wieloparametrowego do stężenia Chl a muszą być wykonane z dużą starannością ze względu na zależność rozpraszania fluorescencyjnego od rodzaju badanego gatunku.
Źródło:: Ecological Chemistry and Engineering. A; 2009, 16, 11; 1501-1513
1898-6188
2084-4530
Pojawia się w:: Ecological Chemistry and Engineering. A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Variability of the specific fluorescence of chlorophyll in the ocean. Part 2. Fluorometric method of chlorophyll a determination
Autorzy:: Ostrowska, M.
Matorin, D.N.
Ficek, D.
Powiązania:: https://bibliotekanauki.pl/articles/47939.pdf
Data publikacji:: 2000
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: variability
luminescence
determination
chlorophyll a
fluorescence
sea
fluorometric method
phytoplankton
ocean
chlorophyll
Opis:: Two methods of determining the chlorophyll a concentration in the sea have been formulated on the basis of artificially induced fluorescence measured with the aid of submersible fluorometers. The method of statistical correlation is founded on the empirical relationship between fluorescence and chlorophyll concentration. The theoretical model of fluorescence described in Part 1 of this paper (see Ostrowska et al. 2000, this volume) provides the basis of the other method, the physical method. This describes the dependence of the specific fluorescence of phytoplankton on the chlorophyll concentration, a diversity of photophysiological properties of phytoplankton and the optical characteristics of the fluorometer. In order to assess their practicability, the methods were subjected to empirical verification. This showed that the physical method yielded chlorophyll concentrations of far greater accuracy. The respective error factors of the estimated chlorophyll concentration were x = 2.07 for the correlation method and x = 1.5 for the physical method. This means that the statistical logarithmic error varies from −52 to +107% in the case of the former method but only from −33 to +51% in the case of the latter. Thus, modifying the methodology has much improved the accuracy of chlorophyll determinations.
Źródło:: Oceanologia; 2000, 42, 2
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Spatial Distribution of Chlorophyll-a and Its Relationship with Dissolved Inorganic Phosphate Influenced by Rivers in the North Coast of Java
Autorzy:: Maslukah, Lilik
Zainuri, Muhammad
Wirasatriya, Anindya
Salma, Ummu
Powiązania:: https://bibliotekanauki.pl/articles/123327.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: phosphate
north Java coast
chlorophyll-a
Opis:: This research examines the eutrophication process mainly by considering the chlorophyll-a concentration. A simple linear model was used to determine the correlation between Chlorophyll-a and dissolved inorganic phosphate (DIP). The research was carried out on river mouths in the north coast of Central Java. The results of the linear model show that the relationship between chlorophyll-a and DIP follows the logarithmic model with the log [Chloa] = 1.52 + 1.60 log [DIP], R² = 0.55. The model suggests that the high concentration of chlorophyll-a is related to dissolved inorganic phosphate concentrations. On the basis of the sufficient of conclusive evidence for these variables, the study sites with high stresses from several anthropogenic sources had higher chlorophyll-a than the sites that are relatively far from river mouths and lands.
Źródło:: Journal of Ecological Engineering; 2019, 20, 7; 18-25
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Variability of chlorophyll-a and diatoms in the frontal ecosystem of Indian Ocean sector of the Southern Ocean
Autorzy:: Rajani Kanta, Mishra
Babula, Jena
Pillai Anilkumar, Narayana
Ravidas Krishna, Naik
Venkateswaran Bhaskar, Parli
Soares, Melena A.
Powiązania:: https://bibliotekanauki.pl/articles/2042169.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Antarctic
chlorophyll-a
diatoms
Southern Ocean
Źródło:: Polish Polar Research; 2017, 38, 3; 375-392
0138-0338
2081-8262
Pojawia się w:: Polish Polar Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Spatio-temporal variability in the Brazil-Malvinas Confluence Zone (BMCZ), based on spectroradiometric MODIS-AQUA chlorophyll-a observations
Autorzy:: Telesca, L.
Pierini, J.O.
Lovallo, M.
Santamaria-del-Angel, E.
Powiązania:: https://bibliotekanauki.pl/articles/48518.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: confluence zone
environmental variation
sea water
phytoplankton
spatio-temporal variability
chlorophyll a
ocean colour
remote sensing
Opis:: The Brazil–Malvinas Confluence Zone (BMCZ) is characterized by high environmental variation, which could be reflected in several optical types of water, from one containing only phytoplankton and sea water to other optically more complex. In this paper, we analyze the spatio-temporal variability of the Chlorophyll-a detected by the ocean color sensor (CHLAsat) in BMCZ in order to understand its environmental variability. We use the MODIS-Aqua CHLAsat monthly composites imagery from 2002 to 2015, and applied two statistical methods: the correlogram-based robust periodogram to identify, over a broad spectrum of temporal, the most significant periodicities, and the pixel gradient distribution to study the spatial-temporal gradients within the BMCZ and variations over the continental shelf and coastal waters. Our results point out to the predominance of the annual cycle over most of the investigated area, although an area from latitude 37°S in direction NE, alongshore of Uruguay to Brazil, evidences interannual periodicities, possibly related to variations in the discharge of the Rio de la Plata associated with the El Niño phenomena. The ocean color spectroradiometric signature in terms of pixel gradient presents a relatively high variability (∼0.0 to 0.65 mg m−3); in particular the high values of the pixel gradient correspond to saline front of the estuarine system of Rio de la Plata, and to the strip of the platform that extends along the isobaths of 80 m (coast of Uruguay), especially in the center and south of the study area.
Źródło:: Oceanologia; 2018, 60, 1
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: The Effect of Different Additions of Carbon Dioxide on Growth, Lipids, Carotenoids and Chlorophyll-a of Chaetoceros calcitrans
Autorzy:: Amaliandini, Esza Rezky
Nashrullah, Syarif
Larasati, Anastasya Dewi
Taufan, Fajar
Sari, Luthfiana Aprilianita
Dewi, Nina Nurmalia
Arsad, Sulastri
Musa, Nadirah
Powiązania:: https://bibliotekanauki.pl/articles/2202339.pdf
Data publikacji:: 2023
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: sustainable fisheries
marine
water quality
pollution
air
microalgae
plankton
Opis:: Global warming gives phytoplankton a significant role in reducing carbon. C. calcitras is a phytoplankton which utilizes carbon dioxide for growth and the formation of secondary metabolites in order to survive. The purpose of this study was to determine the effect of differences in duration on growth, lipid content, carotenoids and chlorophyll-a in C. calcitrans and to determine the optimal duration. An experimental method with statistical analysis using ANOVA was used in this study. The treatments implemented were the addition of carbon dioxide for 0, 2, 4, 6, 8, 10, 12, and 14 minutes with a volume of carbon dioxide addition of 3 bps. The results showed that the addition of carbon dioxide had a significant effect (P<0.05) on the value of lipids, growth, carotenoids and chlorophyll-a. The highest density value was obtained in Treatment for 2 minutes to increase growth with the highest total value of 2,927,500 cells/ml. The best treatment to increase lipids was Treatment for 12 minutes with lipid content of 63.33% and lipid productivity of 1.82 mg/l/day. The best treatment to increase carotenoid content was Treatment for 4 minutes with carotenoid content of 2.20 g/mL and chlorophyll-a content of 1.4431 g/mL. Optimal treatment differences to obtain the highest value of each parameter differ from each other, depending on the synthesis and physiological processes of C. calcitrans.
Źródło:: Journal of Ecological Engineering; 2023, 24, 1; 289--298
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Estimation of Chlorophyll-a Phytoplankton in the Coastal Waters of Semarang and Jepara for Monitoring the Eutrophication Process using MODIS-Aqua Imagery and Conventional Methods
Autorzy:: Maslukah, Lilik
Setiawan, Riza Yuliratno
Nurdin, Nurjannah
Zainuri, Muhammad
Wirastriya, Anindya
Helmi, Muhammad
Powiązania:: https://bibliotekanauki.pl/articles/1839558.pdf
Data publikacji:: 2021
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: chlorophyll a
eutrophic
spectrometry
satellite
MODIS-Aqua
Opis:: This study investigates the concentration of chlorophyll-a (chl-a) using the data of field observation and MODISAqua imagery. The field observation data were retrieved by using a conventional method and processed using spectrometric analysis. This study covers the coastal and near land areas which have different levels of anthropogenic activity. The results showed that the coastal waters of Semarang with a high level of anthropogenic activity persistently show a concentration of chlorophyll a (chl-a) twice as large as Jepara coastal waters. This comparison value is obtained based on imagery and field data. Meanwhile, the ratio of chl-a field data in each region shows a value of ±5 times greater than the MODIS data. Field observation data shows a higher value than the MODISAqua imagery data. The use of imagery data can be employed as a method of monitoring the eutrophication process on the coast. On the basis of the chlorophyll a classification and field observations, the coastal water of Semarang are classified as eutropic waters and Jepara is categorized as mesotropic category. The classification results will be different if monitoring is carried out using the image data with a location far from the mainland, the Semarang waters are included in the mesotropic category (> 2 mg•m-3) and Jepara is included in the oligotropic water category (< 2 mg•m-3).
Źródło:: Journal of Ecological Engineering; 2021, 22, 1; 51-59
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Remote sensing of vertical phytoplankton pigment distributions in the Baltic: new mathematical expressions. Part 1: Total chlorophyll a distribution
Autorzy:: Ostrowska, M.
Majchrowski, R.
Ston-Egiert, J.
Wozniak, B.
Ficek, D.
Dera, J.
Powiązania:: https://bibliotekanauki.pl/articles/47972.pdf
Data publikacji:: 2007
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: remote sensing
phytoplankton pigment
chlorophyll a
vertical distribution
concentration
Baltic Sea
distribution
Opis:: This article is the first in a series of three describing the modelling of the vertical different photosynthetic and photoprotecting phytoplankton pigments concentration distributions in the Baltic and their interrelations described by the so-called non-photosynthetic pigment factor. The model formulas yielded by this research are an integral part of the algorithms used in the remote sensing of the Baltic ecosystem. Algorithms of this kind have already been developed by our team from data relating mainly to oceanic Case 1 waters (WC1) and have produced good results for these waters. But their application to Baltic waters, i.e., Case 2 waters, was not so successful. On the basis of empirical data for the Baltic Sea, we therefore derived new mathematical expressions for the spatial distribution of Baltic phytoplankton pigments. They are discussed in this series of articles. This first article presents a statistical model for determining the total concentration of chlorophyll a (i.e., the sum of chlorophylls a+pheo derived spectrophotometrically) at different depths in the Baltic Sea Ca(z) on the basis of its surface concentration Ca(0), which can be determined by remote sensing. This model accounts for the principal features of the vertical distributions of chlorophyll concentrations characteristic of the Baltic Sea. The model’s precision was verified empirically: it was found suitable for application in the efficient monitoring of the Baltic Sea. The modified mathematical descriptions of the concentrations of accessory pigments (photosynthetic and photoprotecting) in Baltic phytoplankton and selected relationships between them are given in the other two articles in this series (Majchrowski et al. 2007, Woźniak et al. 2007b, both in this volume).
Źródło:: Oceanologia; 2007, 49, 4
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Dynamics of Protein Elements of Hybrid Nanostructures - Molecular Dynamics Simulations of Light Harvesting Peridinin-Chlorophyll a-Protein Model
Autorzy:: Jasiński, A.
Mikulska, K.
Krajnik, B.
Mackowski, S.
Nowak, W.
Powiązania:: https://bibliotekanauki.pl/articles/1419508.pdf
Data publikacji:: 2012-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 87.10.Tf
87.15.-v
Opis:: Hybrid nanostructures are often composed of inorganic parts and "biological" ones. Optimized through million years of evolution light harvesting proteins are hard to mimic synthetically. Promising strategy in search for efficient solar cells is an attachment of selected natural protein systems to inorganic quantum dots. Such experimental hybrid structures should have improved charge separation properties. Among the most promising proteins is peridinin-chlorophyll-protein from Amphidinium carterae (PCP). It has a wide absorption spectrum (420-550 nm), optimized for sunlight. The dynamics of this protein, used in modern nanotechnology has been not addressed yet. In this work we present results of PCP computer modeling using a well established molecular dynamics methodology. The CHARMM27 force field parameters were prepared for this protein and all chromophore components. The system was embedded in a box of water, with proper counter ions, and a number of 10 ns molecular dynamics simulations were run using the NAMD code. It has been found that peridinine chromophores exhibit substantial orientational flexibility but a pair Per612 and Per613 is more rigid than the remaining two carotenoids. Orientation and dynamics of absorption and emission electric dipole moments have been also analyzed. Apparently, the architecture of PCP is not optimized for efficient Per-Chl a energy transfer by the Förster mechanism. Several practical issues related to molecular dynamics simulation of similar hybrid nanostructures are discussed.
Źródło:: Acta Physica Polonica A; 2012, 122, 2; 284-288
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: The Determination of Shortfin Scad (Decapterus sp.) Potential Fishing Area with Chlorophyll-a Distribution in Pekalongan Sea, Central Java, Indonesia
Autorzy:: Wicaksono, Viga Ananda
Hasan, Zahidah
Gumilar, Iwang
Dewanti, Lantun P.
Powiązania:: https://bibliotekanauki.pl/articles/1075694.pdf
Data publikacji:: 2019
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Chlorophyll-a
Fishing ground
Pekalongan
Shortfin Scad
Opis:: The fishing ground can be determined by detecting oceanography parameters in seawater area. One of the oceanographic parameters that can be used is chlorophyll-a. This research aims to analyze the relationship between chlorophyll-a and total catch of shortfin scad along with potential map areas for fishing shortfin scad (Decapterus sp.) in Pekalongan seawater. The research was conducted in two stages, which are field data collection in January and downloading and processing satellite image data in February. This research used the survey method with spatial analysis. Primary spatial data used is the distribution of chlorophyll-a and data of shortfin scad fishing production. The study shows an average concentration of chlorophyll-a from 2013-2017 in Pekalongan seawater ranges around 0,16 - 1,55 mg/m3. The result of linear regression test shows that chlorophyll-a has a role as one of the factors that influence the total catch of shortfin scad in Pekalongan seawater, East Java by 23%. Other factors influence the remaining 77%. Based on the assessment of fishing ground, there are 25 potential coordinate points of shortfin scad fishing area in Pekalongan seawater that can be categorized as a potential fishing ground.
Źródło:: World Scientific News; 2019, 119; 111-124
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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