scholarly journals Inducible Conditions for Sorus Formation of the Sporophyte Discs of Laminaria japonica Areschoug (Phaeophyceae)

1999 ◽  
Vol 65 (1) ◽  
pp. 104-108 ◽  
Author(s):  
Hiroyuki Mizuta ◽  
Kazumi Nimura ◽  
Hirotoshi Yamamoto
Keyword(s):  
Laminaria Japonica ◽  
Sorus Formation

scholarly journals Xanthophylls from the Sea: Algae as Source of Bioactive Carotenoids

Marine Drugs ◽  
2021 ◽  
Vol 19 (4) ◽  
pp. 188
Author(s):  
Antia G. Pereira ◽  
Paz Otero ◽  
Javier Echave ◽  
Anxo Carreira-Casais ◽  
Franklin Chamorro ◽  
...  
Keyword(s):  
Haematococcus Pluvialis ◽  
Biological Effects ◽  
Algal Species ◽  
Antioxidant Properties ◽  
Laminaria Japonica ◽  
Chlorella Zofingiensis ◽  
Brown Seaweeds ◽  
Extraction And Purification ◽  
Available Information ◽  
Large Groups

Algae are considered pigment-producing organisms. The function of these compounds in algae is to carry out photosynthesis. They have a great variety of pigments, which can be classified into three large groups: chlorophylls, carotenoids, and phycobilins. Within the carotenoids are xanthophylls. Xanthophylls (fucoxanthin, astaxanthin, lutein, zeaxanthin, and β-cryptoxanthin) are a type of carotenoids with anti-tumor and anti-inflammatory activities, due to their chemical structure rich in double bonds that provides them with antioxidant properties. In this context, xanthophylls can protect other molecules from oxidative stress by turning off singlet oxygen damage through various mechanisms. Based on clinical studies, this review shows the available information concerning the bioactivity and biological effects of the main xanthophylls present in algae. In addition, the algae with the highest production rate of the different compounds of interest were studied. It was observed that fucoxanthin is obtained mainly from the brown seaweeds Laminaria japonica, Undaria pinnatifida, Hizikia fusiformis, Sargassum spp., and Fucus spp. The main sources of astaxanthin are the microalgae Haematococcus pluvialis, Chlorella zofingiensis, and Chlorococcum sp. Lutein and zeaxanthin are mainly found in algal species such as Scenedesmus spp., Chlorella spp., Rhodophyta spp., or Spirulina spp. However, the extraction and purification processes of xanthophylls from algae need to be standardized to facilitate their commercialization. Finally, we assessed factors that determine the bioavailability and bioaccesibility of these molecules. We also suggested techniques that increase xanthophyll’s bioavailability.

scholarly journals Effects of Daily Kelp (Laminaria japonica) Intake on Body Composition, Serum Lipid Levels, and Thyroid Hormone Levels in Healthy Japanese Adults: A Randomized, Double-Blind Study

Marine Drugs ◽  
2021 ◽  
Vol 19 (7) ◽  
pp. 352
Author(s):  
Seiichiro Aoe ◽  
Chiemi Yamanaka ◽  
Hirofumi Ohtoshi ◽  
Fumiko Nakamura ◽  
Suguru Fujiwara
Keyword(s):  
Thyroid Hormone ◽  
Body Fat ◽  
Laminaria Japonica ◽  
Body Fat Percentage ◽  
Fat Percentage ◽  
Double Blind ◽  
Serum Thyroid Hormone ◽  
Thyroid Hormone Levels ◽  
Male Subjects ◽  
Japanese Subjects

To investigate whether supplementation with iodine-reduced kelp (Laminaria japonica) powder decreases body fat composition in overweight Japanese subjects, a randomized, double-blind, placebo-controlled intervention study was conducted in 50 Japanese subjects with body mass index (BMI) ≥25 and <30 kg/m2. Subjects were randomly assigned to consume thirty tablets/d (10 tablets orally, 3 times/d) containing either iodine-reduced kelp powder (test, 6 g kelp powder corresponding to 3 g alginate/d) or kelp-free powder (placebo) for 8 weeks. Anthropometric measurements, blood lipids, and serum thyroid hormone levels were obtained before and after the trial. Body fat percentage was significantly decreased in male subjects from the test group compared with the placebo group. The same tendency was observed for body weight (p = 0.065) and BMI (p = 0.072) in male subjects. No significant changes in anthropometric measurements or visceral fat area were observed in female subjects. Serum thyroid hormone concentrations did not increase after 1.03 mg/d of iodine supplementation through kelp intake. The intake of iodine-reduced kelp powder led to significant and safe reductions in body fat percentage in overweight male subjects. The consumption of kelp high in alginate may contribute to preventing obesity without influencing thyroid function in Japanese subjects with a relatively high intake of iodine from seaweed.

Polysaccharides from Laminaria japonica show hypoglycemic and hypolipidemic activities in mice with experimentally induced diabetes

2014 ◽  
Vol 239 (12) ◽  
pp. 1663-1670 ◽  
Author(s):  
Xibei Jia ◽  
Juan Yang ◽  
Zhi Wang ◽  
Ruichan Liu ◽  
Rujuan Xie
Keyword(s):  
Laminaria Japonica ◽  
Experimentally Induced

Biosorption of uranium(VI) from aqueous solution by biomass of brown algae Laminaria japonica

2014 ◽  
Vol 70 (1) ◽  
pp. 136-143 ◽  
Author(s):  
K. Y. Lee ◽  
K. W. Kim ◽  
Y. J. Baek ◽  
D. Y. Chung ◽  
E. H. Lee ◽  
...  
Keyword(s):  
Particle Size ◽  
Brown Algae ◽  
Activated Carbons ◽  
Laminaria Japonica ◽  
Limiting Factor ◽  
Stable Operation ◽  
Experimental Conditions ◽  
Wastewater Treatment Process ◽  
Radioactive Wastewater ◽  
Ionic Diffusivity

The uranium(VI) adsorption efficiency of non-living biomass of brown algae was evaluated in various adsorption experimental conditions. Several different sizes of biomass were prepared using pretreatment and surface-modification steps. The kinetics of uranium uptake were mainly dependent on the particle size of the prepared Laminaria japonica biosorbent. The optimal particle size, contact time, and injection amount for the stable operation of the wastewater treatment process were determined. Spectroscopic analyses showed that uranium was adsorbed in the porous inside structure of the biosorbent. The ionic diffusivity in the biomass was the dominant rate-limiting factor; therefore, the adsorption rate was significantly increased with decrease of particle size. From the results of comparative experiments using the biosorbents and other chemical adsorbents/precipitants, such as activated carbons, zeolites, and limes, it was demonstrated that the brown algae biosorbent could replace the conventional chemicals for uranium removal. As a post-treatment for the final solid waste reduction, the ignition treatment could significantly reduce the weight of waste biosorbents. In conclusion, the brown algae biosorbent is shown to be a favorable adsorbent for uranium(VI) removal from radioactive wastewater.

scholarly journals Calcium pretreatment increases thermotolerance of Laminaria japonica sporophytes

2009 ◽  
Vol 19 (4) ◽  
pp. 435-442 ◽  
Author(s):  
You Wang ◽  
Qingyun Yu ◽  
Xuexi Tang ◽  
Lili Wang
Keyword(s):  
Laminaria Japonica

Evaluation of the potential role of the macroalga Laminaria japonica for alleviating coastal eutrophication

2011 ◽  
Vol 102 (21) ◽  
pp. 9912-9918 ◽  
Author(s):  
Dong Xu ◽  
Zhengquan Gao ◽  
Xiaowen Zhang ◽  
Zhanhui Qi ◽  
Chunxiao Meng ◽  
...  
Keyword(s):  
Potential Role ◽  
Laminaria Japonica ◽  
Coastal Eutrophication

A glycoprotein from Laminaria japonica induces apoptosis in HT-29 colon cancer cells

2010 ◽  
Vol 24 (6) ◽  
pp. 1546-1553 ◽  
Author(s):  
Hiroe Go ◽  
Hye-Jung Hwang ◽  
Taek-Jeong Nam
Keyword(s):  
Colon Cancer ◽  
Cancer Cells ◽  
Laminaria Japonica ◽  
Colon Cancer Cells ◽  
Ht 29
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