Journal of Applied Phycology

article

Effects of partial acid hydrolysis on physical and chemical properties of agar from a newly reported Japanese agarophyte (Gracilariopsis lemaneiformis)

Anong Chirapart, Masao Ohno, Hiroyuki Ukeda, Masayoshi Sawamura, more

Journal of Applied Phycology > 1997 > 9 > 1 > 73-76

Physical and chemical properties of alkali-treated agar polymers extracted from Gracilariopsis lemaneiformis, newly reported Japanese agarophyte, were investigated after partial acid hydrolysis. The alkali-treated agar was hydrolyzed in boiling 0.1 N, 0.01 N, and 0.001 N sulfuric acid, oxalic acid, acetic acid, and citric acid solutions, for 1, 2, and 3 h at 100 °C. Partial acid hydrolysis of the...

article

A comparison of screening methods for antioxidant activity in seaweeds

R. Matsukawa, Z. Dubinsky, E. Kishimoto, K. Masaki, more

Journal of Applied Phycology > 1997 > 9 > 1 > 29-35

The inhibition of lipid peroxidation and radical scavenging effects were studied to evaluate the antioxidant activity for extracts of 17 species of seaweed. The antioxidant effect was evaluated by determination of lipoxygenase activity and by α, α-diphenyl-β-picrylhydrazyl (DPPH) decolorization. Lipoxygenase activity was depressed in the presence of aqueous and ethanol extracts of 4 algal species;...

article

Patents

Journal of Applied Phycology > 1997 > 9 > 1 > 81-89

article

Factors influencing growth and toxin production by cultures of the freshwater cyanobacterium Lyngbya wollei Farlow ex Gomont

Qiqin Yin, Wayne W. Carmichael, William R. Evans

Journal of Applied Phycology > 1997 > 9 > 1 > 55-63

Collections of Lyngbya wollei were taken from Guntersville Reservoir, Alabama, over a period of three years. Healthy filaments were isolated and transferred to agar plates of Z-8 and LM6E media. Unialgal isolates were cultured for the study of growth and paralytic shellfish poison (PSP) production. Filaments were extracted and the toxins were detected using high performance liquid chromatography (HPLC)...

article

Aerobic microbial degradation of alginate in Laminaria hyperborea stipes containing different levels of polyphenols

Einar Moen, Bjørn Larsen, Kjetill Østgaard

Journal of Applied Phycology > 1997 > 9 > 1 > 45-54

The polyphenols present in brown seaweed tissue may seriously affect aerobic microbial degradation, particularly the alginate present. Laminaria hyperborea stipes, harvested at 59 °N off the Norwegian coast in autumn, were degraded at different levels of polyphenols in aerated batch reactors at 35 °C and pH 7. This was achieved by manipulating the relative amounts of peripheral tissue, by removing...

article

Physiological behaviour of Arthrospira (Spirulina) maxima during acclimation to changes in irradiance

L. Tomaselli, G. Boldrini, M.C. Margheri

Journal of Applied Phycology > 1997 > 9 > 1 > 37-43

The physiological behaviour of Arthrospira (Spirulina) maxima during acclimation to sudden changes in irradiance from high (HL) to low light (LL) and vice versa was studied by following parameters concerning growth rate, pigment, carbohydrate and protein cell contents. Applying first order kinetics, the specific acclimation rates for the parameters considered were calculated. During HL to LL shift,...

article

Book Reviews

Journal of Applied Phycology > 1997 > 9 > 1 > 77-79

article

Environmental stress during early development of kelp sporophytes (Laminaria saccharina): how long do effects persist?

Valrie A. Gerard

Journal of Applied Phycology > 1997 > 9 > 1 > 5-9

Results of previous studies suggested that deleterious effects of environmental stress on young kelp sporophytes might persist for weeks or even months after optimal conditions are resumed. Such long-lasting effects could influence subsequent growth and survival of wild populations or aquacultural crops subjected to stressful conditions soon after germination. To determine how long stress effects...

article

Characterization of the growth and lipid content of the diatom Chaetoceros muelleri

K. M. McGinnis, T. A. Dempster, M. R. Sommerfeld

Journal of Applied Phycology > 1997 > 9 > 1 > 19-24

Chaetoceros muelleri (Schütt) was cultured on a thermal gradient plate, subjected to two media types with a range of specific conductances, and evaluated for growth and neutral lipid accumulation. Growth was measured directly by daily changes in cell numbers and indirectly by changes in optical density at 750 nm. C. muelleri exhibited a growth rate of at least two doublings day-1 over broad temperature...

article

Chemical and physical characterization of calcified red algal deposits known as maërl

Gerald Blunden, Sheelagh A. Campbell, James R. Smith, Michael D. Guiry, more

Journal of Applied Phycology > 1997 > 9 > 1 > 11-17

Maërl, comprised of shallow, subtidal deposits of calcareous red algae belonging to the family Corallinaceae, is used in agriculture, primarily to increase soil pH. Its use has been strongly criticised because of its high price compared to limestone. The chemical and physical characteristics of maërl and limestone are compared to determine whether these indicate if any benefit is to be gained with...

article

Spirulina industry in China: Present status and future prospects

Ding-Mei Li, Yu-Zao Qi

Journal of Applied Phycology > 1997 > 9 > 1 > 25-28

The Spirulina industry in China is developing rapidly as a national strategic programme. Currently, there are more than 80 production factories, with a total annual production of more than 350 t dry powder and total production area of over 106 m2. Spirulina products are being used as food, forage and medicine. The low unit area output and non-consistent product quality call for further research on...

article

Accumulation of uranium at low concentration by the green alga Scenedesmus obliquus 34

Xiaozhi Zhang, Shanggeng Luo, Qun Yang, Huaili Zhang, more

Journal of Applied Phycology > 1997 > 9 > 1 > 65-71

Accumulation of UO ₂ ² ⁺ by Scenedesmus obliquus 34 was rapid and energy-independent and the biosorption of UO ₂ ² ⁺ could be described by the Freundlich adsorption isotherm below the maximum adsorption capacity (75 mg g-¹ dry wt). The optimum pH for uranium uptake was between 5.0_8.5.0.1_2.0 M NaCl enhanced uranyl, while Cu²⁺, Ni²⁺, Zn²⁺, Cd²⁺ and Mn²⁺ competed slightly with uranyl. Pretreatment...

article

Growth of a dissociated, filamentous stage of Codium species in laboratory culture

M-H. Yang, G. Blunden, F-L. Huang, R. L. Fletcher

Journal of Applied Phycology > 1997 > 9 > 1 > 1-3

Unialgal cultures were established from isolated utricles for all five Codium species occurring in the British Isles and growth studies performed under different conditions of temperature (10-30 °C), photon irradiance (0-175 µmol m-2 s-1) and salinity (0-100% seawater growth medium). The species studied were C. fragile ssp. tomentosoides, C. fragile ssp. atlanticum, C. adhaerens, C. bursa, C. tomentosum...

article

Alginate degradation during anaerobic digestion of Laminaria hyperborea stipes

Einar Moen, Svein Horn, Kjetill Østgaard

Journal of Applied Phycology > 1997 > 9 > 2 > 157-166

Polyphenols and divalent metal ions present in the tissue may seriously affect the degradation of alginate during anaerobic digestion of brown seaweeds. Laminaria hyperborea stipes, harvested at 59 °N off the Norwegian coast in the autumn, were degraded at different concentrations of polyphenols in anaerobic batch reactors at 35 °C and pH 7. This was done by removing or adding the mechanically peeled...

article

Optimized nitrate reductase assay predicts the rate of nitrate utilization in the halotolerant microalga Dunaliella viridis

F. Javier, L. Gordillo, Carlos Jiménez, Alfonso Corzo, more

Journal of Applied Phycology > 1997 > 9 > 2 > 99-106

An in situ method for measuring nitrate reductase (NR) activity in Dunaliella viridis was optimized in terms of incubation time, concentration of KNO₃, permeabilisers (1-propanol and toluene), pH, salinity, and reducing power (glucose and NADH). NR activity was measured by following nitrite production and was best assayed with 50 mM KNO₃, 1.2 mM NADH, 5% 1-propanol (v/v), at pH 8.5. The estimated...

article

Composition and accumulation of secondary carotenoids in Chlorococcum sp.

D. H. Zhang, Y. K. Ng, S. M. Phang

Journal of Applied Phycology > 1997 > 9 > 2 > 147-155

A locally isolated Chlorococcum sp. could accumulate astaxanthin and its esters as secondary carotenoids. The secondary carotenoids could reach a concentration of 5.2 mg g⁻¹ d. wt, and were located in the cytoplasm and chloroplast as globules. Cells grew best at pH 8.0 and 30 °C, at which the growth rate was about 0.066 h⁻¹. Acidic condition (pH 5.5 and 6.5) and slightly elevated temperature (35 °C)...

article

Ceramialean epiphytism in an intertidal Gracilaria chilensis (Rhodophyta) bed in southern Chile

Alejandro H. Buschmann, Claudia A. Retamales, Claudia Figueroa

Journal of Applied Phycology > 1997 > 9 > 2 > 129-135

The cultivation of the agarophytic red alga Gracilaria has become an activity of major importance in several parts of the world. However, Gracilaria cultivation in Chile still faces problems such as epiphytism. We report ceramialean epiphytism abundance, recruitment patterns and the microscopic stages fixed on the Gracilaria thalli in an intertidal bed (Metri bay) of southern Chile. Using a factorial...

article

Changes in atrazine toxicity throughout succession of stream periphyton communities

Helena Guasch, Isabel Muñoz, Núria Rosés, Sergi Sabater

Journal of Applied Phycology > 1997 > 9 > 2 > 137-146

A study was made to describe atrazine toxicity and its changes throughout succession of periphyton communities of an undisturbed Mediterranean stream. Toxicity was assessed by short-term physiological tests (concentration-effect curves of photosynthesis to atrazine) in the laboratory using artificial substrates colonized in one stream site during winter, and two stream sites (one open and the other...

article

Determination of biomass dry weight of marine microalgae

C. J. Zhu, Y. K. Lee

Journal of Applied Phycology > 1997 > 9 > 2 > 189-194

Total biomass dry weight (DW) and ash free dry weight (AFDW) of five species of marine microalgae, Dunaliella sp., Isochrysis galbana, Nannochloropsis sp., Nitzschiaclosterium and Porphyridium cruentum, retained on filter paper, were determined. Dunaliella and Isochrysis cells have no cell wall; Nannochloropsis, Nitzschia and Porphyridium possess a cell wall and Nitzschia and Porphyridium cells are...

article

Reproductive and peri- and postnatal evaluation of Spirulina maxima in mice

Germán Chamorro, Silvia Salazar, Luis Favila-Castillo, Christopher Steele, more

Journal of Applied Phycology > 1997 > 9 > 2 > 107-112

Spirulina maxima, provided by Sosa Texcoco Company (México City), was administered to mice of both sexes in a fertility study, at concentrations of 0, 10, 20 and 30% incorporated into the diet. Males were fed for nine weeks while females, for two weeks, and feeding continued during the mating period and gestation. On the other hand, in a peri- and postnatal study, the alga was given only to females...

INFONA - science communication portal

Journal of Applied Phycology

Effects of partial acid hydrolysis on physical and chemical properties of agar from a newly reported Japanese agarophyte (Gracilariopsis lemaneiformis)

A comparison of screening methods for antioxidant activity in seaweeds

Patents

Factors influencing growth and toxin production by cultures of the freshwater cyanobacterium Lyngbya wollei Farlow ex Gomont

Aerobic microbial degradation of alginate in Laminaria hyperborea stipes containing different levels of polyphenols

Physiological behaviour of Arthrospira (Spirulina) maxima during acclimation to changes in irradiance

Book Reviews

Environmental stress during early development of kelp sporophytes (Laminaria saccharina): how long do effects persist?

Characterization of the growth and lipid content of the diatom Chaetoceros muelleri

Chemical and physical characterization of calcified red algal deposits known as maërl

Spirulina industry in China: Present status and future prospects

Accumulation of uranium at low concentration by the green alga Scenedesmus obliquus 34

Growth of a dissociated, filamentous stage of Codium species in laboratory culture

Alginate degradation during anaerobic digestion of Laminaria hyperborea stipes

Optimized nitrate reductase assay predicts the rate of nitrate utilization in the halotolerant microalga Dunaliella viridis

Composition and accumulation of secondary carotenoids in Chlorococcum sp.

Ceramialean epiphytism in an intertidal Gracilaria chilensis (Rhodophyta) bed in southern Chile

Changes in atrazine toxicity throughout succession of stream periphyton communities

Determination of biomass dry weight of marine microalgae

Reproductive and peri- and postnatal evaluation of Spirulina maxima in mice

Filter options

Publication date

Year

Keywords

INFONA - science communication portal

Journal of Applied Phycology

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Year

Keywords

Reporting an error / abuse

Sending the report failed

Accessibility options