The effect of artificial ultraviolet (UV) and natural solar radiation on photosynthesis, respiration and growth was investigated in 14 red, green and brown macroalgal species on Spitsbergen (Norway) during summer 1998. In June, maximum mean solar radiation at sea level was 120 W m-2 of visible (370 to 695 nm) and 15 W m-' of UV radiation (300 to 370 nm), and decreased gradually until the end of...

Although some alginate lyases have been isolated from marine bacteria, alginate lyases-excreting bacteria from the Arctic alga have not yet been investigated. Here, the diversity of the bacteria associated with the brown alga Laminaria from the Arctic Ocean was investigated for the first time. Sixty five strains belonging to nine genera were recovered from six Laminaria samples, in which Psychr...

A novel marine strain representing efficient degradation ability toward brown algae was isolated, identified, and assigned to Bacillus weihaiensis Alg07. The alga-associated marine bacteria promote the nutrient cycle and perform important functions in the marine ecosystem. The de novo sequencing of the B. weihaiensis Alg07 genome was carried out. Results of gene annotation and carbohydrate-acti...

The ciliate Paramecium bursaria and the green alga Chlorella species can establish endosymbiosis by mixing them through the host digestive vacuoles. Pulse-labeling of alga-free Paramecium cells with isolated symbiotic algae for 1.5 min and chasing for various times showed presence of four cytological phenomena which are indispensable for the algal reinfection. (1) Some algae acquire temporal re...

Associated microbiota play crucial roles in health and disease of higher organisms. For macroalgae, some associated bacteria exert beneficial effects on nutrition, morphogenesis and growth. However, current knowledge on macroalgae-microbiota interactions is mostly based on studies on green and red seaweeds. In this study, we report that when cultured under axenic conditions, the filamentous bro...

ABSTRAKAlga coklat (Sargassum crassifolium) merupakan salah satu jenis makroalga yang tumbuh sangat melimpah di kawasan pesisir Selatan Jawa khususnya wilayah Pantai Pacitan dan Trenggalek. Penelitian ini bertujuan untuk mengetahui perbedaan kosentrasi nutrisi Sargassum crassifolium meliputi lemak, protein, serat karbohidrat pada lokasi berbeda. Pengambilan sampel dilakukan dua berbeda masing-m...

to study the impact of growth factor bacteria , humic acid  and alga extract in drought stress condition  a test is established in form of completely random blocks  and spilt plot  in 4 replications  in a field in mahallat in arak  province in 1389. two primary plots including irrigation and stress  and secondary  plots including  growth factor bacteria ,humic acid  and  alga extract, ascophylu...

The haploid-diploid life cycle of the filamentous brown alga Ectocarpus involves alternation between two independent and morphologically distinct multicellular generations, sporophyte gametophyte. Deployment developmental program requires TALE homeodomain transcription factors OUROBOROS SAMSARA. In addition, generation has been shown to secrete a diffusible factor that can induce uni-spores swi...

The biosorption of hexavalent chromium ions from aqueous solution was investigated using acid-modified dead biomass the abundantly available brown marine alga Cystoseira indica Karachi coastal area Pakistan. biosorbent characterized by infrared spectroscopy and scanning electron microscopy. optimum conditions, i.e., dosage, contact time, initial metal ion concentration, pH, temperature, were de...