Physiological responses to light intensity and photoperiod of the halotolerant cyanobacterium Desmonostoc salinum CCM-UFV059

2020 ◽  
Vol 11 ◽  
pp. 100443
Author(s):  
Luna Viggiano de Alvarenga ◽  
Allan Victor Martins Almeida ◽  
Naira Valle de Castro ◽  
Jean Coutinho Oder ◽  
Alberto Esteves-Ferreira ◽  
...  
Keyword(s):  
Light Intensity ◽  
Physiological Responses ◽  
Halotolerant Cyanobacterium

scholarly journals Physiological response of Monimopetalum chinense to light stress under habitat fragmentation

2010 ◽  
Vol 56 (No. 12) ◽  
pp. 551-556 ◽  
Author(s):  
C. Hao ◽  
R. Fan ◽  
X. Zhang ◽  
L. Wang ◽  
W. Chen ◽  
...  
Keyword(s):  
Antioxidant Enzymes ◽  
Habitat Fragmentation ◽  
Light Intensity ◽  
Physiological Responses ◽  
Light Stress ◽  
Strong Light ◽  
Malondialdehyde Content ◽  
Antioxidant Enzymes Activities ◽  
Intense Light ◽  
Effect Of Light

To determine the effect of light stress under fragmental habitat on the physiology, this paper investigated the physiological responses of Monimopetalum chinense with different light intensities in the Xianyu Mountains (Anhui, China). The study showed that both weak and intense light brought about by habitat fragmentation could improve antioxidant enzymes activities, and promote electrical conductivity and malondialdehyde content of M. chinense leaves. However, too strong light could inhibit photosynthesis rates, superoxide dismutase, catalase, and ascorbate peroxidase activities. In addition, the characteristics of leaves were affected by light intensity at the fragmental habitat. Specifically, intense light was disadvantageous to photosynthesis and antioxidant enzymes of the species. Our results suggest that the biodiversity conservation of M. chinense is necessary, and that light intensity should be considered carefully when implementing conservation efforts.  

A Physiological Perspective on Treadmill and Sit-to-Stand Workstations

2015 ◽  
Vol 23 (3) ◽  
pp. 14-19 ◽  
Author(s):  
Dinesh John ◽  
Kate Lyden ◽  
David R. Bassett
Keyword(s):  
Blood Flow ◽  
Light Intensity ◽  
Brain Function ◽  
Physiological Responses ◽  
Musculoskeletal Health ◽  
Flow Energy ◽  
Prolonged Sitting ◽  
Sit To Stand ◽  
Contraction Type ◽  
Office Employees

Active workstations, such as treadmill and sit-to-stand workstations, enable office employees to break prolonged sitting with bouts of light-intensity walking and/or standing. Compared with sitting, walking and/or standing accumulated during the workday using these workstations will increase muscle contractions, which may influence blood flow, energy expenditure, metabolism, musculoskeletal health, and brain function. Physiological responses when using treadmill and sit-to-stand workstations may vary due to differences in muscle contraction type (dynamic vs. static) and may thus affect cardio-metabolic and musculoskeletal health and brain function in different ways.

Morpho-physiological responses of Nothofagus obliqua to light intensity and water status, with focus on primary growth dynamics

Trees ◽  
2018 ◽  
Vol 32 (5) ◽  
pp. 1301-1314 ◽  
Author(s):  
Cristian D. Torres ◽  
Amaru Magnin ◽  
Santiago A. Varela ◽  
Marina Stecconi ◽  
Javier E. Grosfeld ◽  
...  
Keyword(s):  
Light Intensity ◽  
Water Status ◽  
Physiological Responses ◽  
Growth Dynamics ◽  
Primary Growth ◽  
Nothofagus Obliqua

Fine structure of the retina of the giant scallop, Placopecten magellanicus

1984 ◽  
Vol 42 ◽  
pp. 312-313
Author(s):  
C.V.L. Powell
Keyword(s):  
Fine Structure ◽  
Electron Microscope ◽  
Light Intensity ◽  
Scanning Electron Microscope ◽  
Eye Development ◽  
Preliminary Observation ◽  
Columnar Epithelium ◽  
Placopecten Magellanicus ◽  
Environmental Light ◽  
Scanning Electron

The overall fine structure of the eye in Placopecten is similar to that of other scallops. The optic tentacle consists of an outer columnar epithelium which is modified into a pigmented iris and a cornea (Fig. 1). This capsule encloses the cellular lens, retina, reflecting argentea and the pigmented tapetum. The retina is divided into two parts (Fig. 2). The distal retina functions in the detection of movement and the proximal retina monitors environmental light intensity. The purpose of the present study is to describe the ultrastructure of the retina as a preliminary observation on eye development. This is also the first known presentation of scanning electron microscope studies of the eye of the scallop.

Effect of light intensity on the ultrastructure of the filamentous cyanobacterium, Anabaena variabilis

1988 ◽  
Vol 46 ◽  
pp. 300-301
Author(s):  
C. S. Bricker ◽  
S. R. Barnum ◽  
B. Huang ◽  
J. G. Jaworskl
Keyword(s):  
Fatty Acid ◽  
Light Intensity ◽  
Acid Content ◽  
Fatty Acid Content ◽  
Anabaena Variabilis ◽  
Chloroplast Envelope ◽  
Major Constituent ◽  
Filamentous Cyanobacterium ◽  
Photosynthetic Membrane ◽  
Effect Of Light

Cyanobacteria are Gram negative prokaryotes that are capable of oxygenic photosynthesis. Although there are many similarities between eukaryotes and cyanobacteria in electron transfer and phosphorylation during photosynthesis, there are two features of the photosynthetic apparatus in cyanobacteria which distinguishes them from plants. Cyanobacteria contain phycobiliproteins organized in phycobilisomes on the surface of photosynthetic membrane. Another difference is in the organization of the photosynthetic membranes. Instead of stacked thylakolds within a chloroplast envelope membrane, as seen In eukaryotes, IntracytopIasmlc membranes generally are arranged in three to six concentric layers. Environmental factors such as temperature, nutrition and light fluency can significantly affect the physiology and morphology of cells. The effect of light Intensity shifts on the ultrastructure of Internal membrane in Anabaena variabilis grown under controlled environmental conditions was examined. Since a major constituent of cyanobacterial thylakolds are lipids, the fatty acid content also was measured and correlated with uItrastructural changes. The regulation of fatty acid synthesis in cyanobacteria ultimately can be studied if the fatty acid content can be manipulated.

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