scholarly journals Metabolitic activity of 11-deoxycorticosterone and prednisolone in the alga Chlorella vulgaris Beijerinck

2014 ◽  
Vol 69 (1) ◽  
pp. 25-29 ◽  
Author(s):  
Romuald Czerpak ◽  
Izabela K. Szamrej
Keyword(s):  
Nucleic Acids ◽  
Green Alga ◽  
Chlorella Vulgaris ◽  
Reducing Sugars ◽  
Dry Weight ◽  
Soluble Proteins ◽  
Inhibitory Influence ◽  
M 10 ◽  
Stimulation Of

The influence of optimal concentrations 5 x 10<sup>-6</sup>M - 10<sup>-6</sup>M of 11-deoxycorticosterone (mineralocorticoid) and prednisolone (glucocorticoid) on the growth (fresh and dry weight) and content of soluble proteins, reducing sugars and nucleic acids in the green alga <em>Chlorella vulgaris</em> (<em>Chlorophyceae</em>). Both corticosteroids at concentration 5 x 10<sup>-6</sup>M were most strongly active metabolically between the 5th-15th day of the cultivation and this probably was caused by their chemical biotransformation. The applied corticosteroids induced the strongest stimulative effect on the content of soluble proteins in the range of 167-196% and reducing sugars (233-275%) when compared to the control (100%). Prednisolone showed lower stimulative activity on the content of proteins. But 11-deoxycorticosterone showed weaker stimulation of on the content of sugar. Both of the corticosteroids showed a stimulating or inhibitory influence upon the content of nucleic acids in <em>C. vulgaris</em> cells without regard to the concentration.

Role of paraventricular and supraoptic nuclei in central cardiovascular regulation in the cat

1980 ◽  
Vol 239 (1) ◽  
pp. R137-R142 ◽  
Author(s):  
J. Ciriello ◽  
F. R. Calaresu
Keyword(s):  
Heart Rate ◽  
Cardiovascular Responses ◽  
Inhibitory Influence ◽  
Sympathetic Nervous Systems ◽  
Aortic Depressor Nerve ◽  
Bilateral Lesions ◽  
Alpha Chloralose ◽  
Supraoptic Nuclei ◽  
Stimulation Of

To investigate the role of the paraventricular (PAH) and supraoptic (SON) nuclei in regulation of the cardiovascular system experiments were done in 26 cats anesthetized with alpha-chloralose, paralyzed, and artificially ventilated. Electrical stimulation of histologically verified sites in the region of the PAH and SON elicited increases in arterial pressure in bilaterally vagotomized animals and increases in heart rate both in spinal (C2) animals and in animals bilaterally vagotomized, In addition, stimulation of either the PAH or SON inhibited the reflex vagal bradycardia elicited by stimulation of the carotid sinus nerve (CSN) and bilateral lesions of these areas increased the magnitude of the response. On the other hand, stimulation and lesions of these hypothalamic regions did not alter the magnitude of the cardiovascular responses to stimulation of the aortic depressor nerve. These results demonstrate that stimulation of the PAH and SON elicit cardiovascular responses due to reciprocal changes in activity of the parasympathetic and sympathetic nervous systems and that these structures maintain a tonic inhibitory influence on the heart rate component of the CSN reflex.

scholarly journals A new inducible expression system in a transformed green alga, Chlorella vulgaris

2011 ◽  
Vol 10 (4) ◽  
pp. 3427-3434 ◽  
Author(s):  
Y.F. Niu ◽  
M.H. Zhang ◽  
W.H. Xie ◽  
J.N. Li ◽  
Y.F. Gao ◽  
...  
Keyword(s):  
Green Alga ◽  
Chlorella Vulgaris ◽  
Expression System ◽  
Inducible Expression ◽  
Inducible Expression System ◽  
Green Alga Chlorella

scholarly journals PHYSIOLOGICAL AND BIOCHEMICAL CHANGES IN ALGAL CULTURES OF CHLORELLA VULGARIS AND SYNECHOCYSTIS SALINA (MESOPHILIC AND ANTARCTIC ISOLATES) OCCURING AFTER TREATMENT WITH UV-B RADIATION

2017 ◽  
pp. 73-82
Author(s):  
Dilyana Doneva ◽  
Juliana Ivanova ◽  
Lyudmila Kabaivanova
Keyword(s):  
Oxidative Stress ◽  
Chlorophyll A ◽  
Chlorella Vulgaris ◽  
Markers Of Oxidative Stress ◽  
Protective Strategies ◽  
The Antarctic ◽  
Antarctic Algae ◽  
Β Carotene ◽  
Stimulation Of

Determination of biomass production and viability of algal cells of Chlorella vulgaris and Synechocystis salina exposed to UV-B radiation were carried out in this study together with comparison of the mesophilic and antarctic isolates of both investigated strains. Estimation of the content of the pigments: chlorophyll a, chlorophyll b, β-carotene, C-phycocyanin and allo-phycocyanin in algal cells exposed to UV-B radiation was also accomplished. The obtained results showed that the antarctic algae are more resistant to oxidative stress than their mesophilic counterparts. The antarctic isolates of Ch. vulgaris and S. salina compared with the mesophilic ones - up to 72 h showed tolerance to low exposures of radiation, expressed in a slight stimulation of growth and viability of the cells. Antarctic isolates also showed greater resistance to low doses of UV-B radiation manifested by stimulation of the synthesis of chlorophyll a and β-carotene. The registered increase in the amount of C- and allo-phycocyanin in antarctic isolates of S. salina showed that they had developed protective strategies against UV-B radiation by increasing the concentration of the phycobiliproteins. As a result of increased UV-B background, in antarctic isolates, stronger antioxidant defence mechanisms are triggered, which proved the possibility of using them as markers of oxidative stress.

scholarly journals Inhibitory influence of the ipsilateral motor cortex on responses to stimulation of the human cortex and pyramidal tract

1998 ◽  
Vol 510 (1) ◽  
pp. 249-259 ◽  
Author(s):  
Christian Gerloff ◽  
Leonardo G. Cohen ◽  
Mary Kay Floeter ◽  
Robert Chen ◽  
Brian Corwell ◽  
...  
Keyword(s):  
Motor Cortex ◽  
Pyramidal Tract ◽  
Inhibitory Influence ◽  
Human Cortex ◽  
Stimulation Of

Effects of Microalgae Chlorella vulgaris Density on the Larval Performances of Fresh Water Prawn Macrobrachium rosenbergii (De Man, 1879)

2021 ◽  
Author(s):  
R.T. Mathew ◽  
Y.A. Alkhamis ◽  
S.M. Rahman ◽  
A.S. Alsaqufi
Keyword(s):  
Fresh Water ◽  
Chlorella Vulgaris ◽  
Macrobrachium Rosenbergii ◽  
Dry Weight ◽  
Larval Survival ◽  
Crustacean Species ◽  
Treatment Groups ◽  
Potential Applications ◽  
Larval Production ◽  
De Man

Background: Microalgae have several potential applications in early stages especially in the hatchery phase of several fish, mollusc and crustacean species. The present study aimed to evaluate the effects of microalgae Chlorella vulgaris at different concentrations on larval performances of Macrobrachium rosenbergii. Methods: Freshly hatched larvae were reared until the metamorphosis of first post larval (PL) stage in plastic aquaria (5 liter, 12ppt and 12L:12D) with a density of 10 larvae/liter under five randomly arranged treatment groups in 3 replicates such as, 0×105 (T1, control) and four different concentrations of C. vulgaris 5×105 (T2), 10×105 (T3), 15×105 (T4) and 20×105 (T5) cells/ml. Larvae were fed Artemia (6 nauplii/ml) six times daily. Result: The results revealed that the addition of microalgae in rearing system significantly enhanced (P less than 0.05) the larval survival and developments than without microalgae. The highest larval survival and faster appearance of PL (in days) was observed in T3 group (60.83%, 24.67 days) followed by T4 (56.91%, 28.33 days) T2 (48.39%, 31.33 days) T5 (40.93%, 32.33 days) and T1 (30.65%, 39 days), respectively. Larvae reared at moderate concentrations of microalgae (T3 and T4) resulted in high dry weight that of extreme low (T2) or high (T5) concentrations of microalgae. This study identified the best concentration of Chlorella vulgaris for the rearing of M. rosenbergii larval and could be applicable for the mass larval production of this species commercially.

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