Survival of Some Fresh-Water Algae under Extreme Environmental Conditions

1974 ◽  
Vol 93 (4) ◽  
pp. 610 ◽  
Author(s):  
Harold E. Schlichting
Keyword(s):  
Fresh Water ◽  
Environmental Conditions

scholarly journals Differential mechanisms of tolerance to extreme environmental conditions in tardigrades

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Dido Carrero ◽  
José G. Pérez-Silva ◽  
Víctor Quesada ◽  
Carlos López-Otín
Keyword(s):  
Dna Repair ◽  
Fresh Water ◽  
Environmental Conditions ◽  
Telomere Maintenance ◽  
Extreme Temperatures ◽  
Surrounding Water ◽  
Genomic Features ◽  
Physical Conditions ◽  
Terrestrial Environments ◽  
Water Bears

Abstract Tardigrades, also known as water bears, are small aquatic animals that inhabit marine, fresh water or limno-terrestrial environments. While all tardigrades require surrounding water to grow and reproduce, species living in limno-terrestrial environments (e.g. Ramazzottius varieornatus) are able to undergo almost complete dehydration by entering an arrested state known as anhydrobiosis, which allows them to tolerate ionic radiation, extreme temperatures and intense pressure. Previous studies based on comparison of the genomes of R. varieornatus and Hypsibius dujardini - a less tolerant tardigrade - have pointed to potential mechanisms that may partially contribute to their remarkable ability to resist extreme physical conditions. In this work, we have further annotated the genomes of both tardigrades using a guided approach in search for novel mechanisms underlying the extremotolerance of R. varieornatus. We have found specific amplifications of several genes, including MRE11 and XPC, and numerous missense variants exclusive of R. varieornatus in CHEK1, POLK, UNG and TERT, all of them involved in important pathways for DNA repair and telomere maintenance. Taken collectively, these results point to genomic features that may contribute to the enhanced ability to resist extreme environmental conditions shown by R. varieornatus.

scholarly journals Characterization and spatio-temporal dynamics of Cylindrospermopsis raciborski in an Amazonian Lagoon, Ecuador.

Enfoque UTE ◽  
2018 ◽  
Vol 9 (2) ◽  
pp. 117-124
Author(s):  
Judith Venegas ◽  
Pablo Castillejo Pons ◽  
Susana Chamorro ◽  
Ivonne Carrillo ◽  
Eduardo Lobo
Keyword(s):  
Fresh Water ◽  
Environmental Conditions ◽  
Scientific Literature ◽  
Temporal Dynamics ◽  
Cylindrospermopsis Raciborskii ◽  
Human Consumption ◽  
Distribution Maps ◽  
Spatio Temporal ◽  
Recreational Use

The cyanobacteria Cylindrospermopsis raciborskii, is a fresh water ubiquitous species from tropical to temperate weather. It is potentially capable of producing toxins.  Thus it is necessary to monitor its presence in fresh waters associated to recreational use activities and human consumption. There are official reports and one thesis reporting the presence of C. raciborskii in Ecuador. Nevertheless, this country does not appear in the latest distribution maps of this species in the scientific literature. In this article, we report the presence of C. raciborskii in Ecuador, together with the characterization of the environmental conditions of one of the habitats where this species is present: the Limoncocha lagoon, province of Sucumbíos.

scholarly journals A Comprehensive Review on Fishery Biology of Catfishes

2015 ◽  
Vol 7 (1) ◽  
pp. 1
Author(s):  
Muhammad Amin ◽  
Mohammad Shoaib ◽  
Ghulam Nabi ◽  
Naveed Ahmed ◽  
Muhammad Kifayatullah
Keyword(s):  
Fresh Water ◽  
Environmental Conditions ◽  
Atmospheric Oxygen ◽  
Review Article ◽  
Open Ocean ◽  
Animal Protein ◽  
Comprehensive Review ◽  
Fishery Biology

Cat fish exploit a large diversity of both plant and animal protein, and adapt harsh environmental conditions as they have the ability to take atmospheric oxygen. Marine catfish tolerate a broad range of salinities between Open Ocean and fresh water. The entire catfishes have soft as well as scaleless body, are greatly appreciated by consumers and maintain healthy in both fresh and dried condition. In this review article various aspects of cat fish has been discussed.

scholarly journals The Clever Strategies That Fishes Use to Survive in San Francisco’s Dynamic Estuary

2021 ◽  
Vol 9 ◽  
Author(s):  
Rachel A. Fichman ◽  
Adi Khen ◽  
Malte Willmes ◽  
Jonathon Kuntz ◽  
Alexander R. Scott ◽  
...  
Keyword(s):  
Fresh Water ◽  
San Francisco ◽  
Environmental Conditions ◽  
San Francisco Estuary ◽  
Salty Water ◽  
Different Parts

Estuaries are places where fresh water from rivers mixes with salty water from the ocean. Why does this matter? This mixing creates dynamic, ever-changing conditions that fishes must navigate in order to survive. Environmental conditions can change yearly, seasonally, daily, and even hourly. Fishes use many different strategies to adjust to this wild variation. Some are picky and only use certain habitats. Others use many different kinds of habitats and move between them at different times of the year. Adults and juveniles might even live away from each other in different parts of the estuary. In this article, we describe some of the clever strategies that fishes use to survive in estuaries. We also consider how scientists uncover these clever strategies and what each of us can do to help protect the fishes of the San Francisco Estuary and elsewhere.

scholarly journals Biological components of Greek lagoonal ecosystems: an overview

2005 ◽  
Vol 6 (2) ◽  
pp. 31 ◽  
Author(s):  
A. NICOLAIDOU ◽  
S. REIZOPOULOU ◽  
D. KOUTSOUBAS ◽  
S. ORFANIDIS ◽  
T. KEVREKIDIS
Keyword(s):  
Fresh Water ◽  
Species Distribution ◽  
Environmental Conditions ◽  
Important Variable ◽  
Great Variability ◽  
Nutrient Load ◽  
Ecological Quality ◽  
New Methods ◽  
Space And Time ◽  
Available Information

The paper summarises the available information on the main biological components – phytoplankton, zooplankton, phytobenthos, zoobenthos and fish – of Greek lagoonal ecosystems. Meiobenthos was also studied in one of the lagoons. All components show great variability both in space and time, which is attributed to the variability of environmental conditions. The most important variable influencing species distribution and diversity is the degree of communication with the sea and the nutrient load introduced through fresh water inputs. Certain new methods, which have been applied for evaluation of the ecological quality state of the lagoons, are also presented.

scholarly journals Comparative Studies on Blood Electrolytes of the Fresh Water Fish, Notopterus notopterus from Three Aquatic Bodies

2015 ◽  
Vol 40 ◽  
pp. 1-5 ◽  
Author(s):  
R.S. Kulkarni
Keyword(s):  
Fresh Water ◽  
Environmental Conditions ◽  
Comparative Studies ◽  
Fresh Water Fish ◽  
Blood Calcium ◽  
Blood Electrolytes ◽  
Water Fish ◽  
Baseline Levels ◽  
Notopterus Notopterus ◽  
Sodium And Potassium

The present study is undertaken to determine baseline levels of blood electrolytes for the fish, N.notopterus collected from three different aquatic bodies situated at different locations around Gulbarga region. The electrolytes such as sodium and potassium levels are having some difference in the fish collected from the three aquatic bodies. The data for blood Sodium 88.49 ± 16.68 mmol/l. in the fish from Bheema River, 101.32 ± 4.17 mmol/l. in the fish from Kagina River, and 87.5 ± 3.41, mmol/l. in the fish from Saradgi Stream., Potassium 14.48 ± 1.14 mmol/l. in the fish from Bheema River, 14.63 ± 1.15 mmol/l. in the fish from Kagina River, 13.19 ± 0.70 mmol/l. in the fish from Saradgi Stream. The blood calcium data are 9.00 ± 0.30 mg/dl. in the fish from Bheema River, 8.69 ± 0.50 mg/dl. in the fish from Kagina River, and 8.39 ± 0.45 mg/dl. in the fish from Saradgi Stream. Based on the results obtained for blood electrolytes, the fish N.notopterus from three aquatic bodies are although healthy and thriving well, the Bheema River provides better environmental conditions.

scholarly journals Effects of Prolonged Starvation on Cholesterol Content of Gonads in Clarias batrachus

Our Nature ◽  
2015 ◽  
Vol 13 (1) ◽  
pp. 26-30 ◽  
Author(s):  
Nayan Kumar Prasad
Keyword(s):  
Fresh Water ◽  
Environmental Conditions ◽  
Cholesterol Content ◽  
Clarias Batrachus ◽  
Male And Female ◽  
Prolonged Starvation ◽  
The Impact

Starvation is experienced in most species of fish during certain periods of every year largely due to environmental conditions and it affects different organs in different ways. The present paper deals with the impact of starvation on cholesterol content of gonadal tissues of a fresh water catfish, Clarias batrachus. The level of cholesterol in the gonads has been found higher in female than in male under both the normal and starved conditions. Both the male and female gonads showed non-significant depletion up to 20 days of starvation but thereafter, it was sharp. After 40 days of starvation, the cholesterol depleted about 84% in male and 79% in female of their normal values.Our Nature (2015), 13(1): 26-30

Vibration Isolator System for Electron Microscope

1990 ◽  
Vol 48 (1) ◽  
pp. 182-183
Author(s):  
K. Ohi ◽  
M. Mizuno ◽  
T. Kasai ◽  
Y. Ohkura ◽  
K. Mizuno ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Magnetic Fields ◽  
Environmental Conditions ◽  
Vibration Isolator ◽  
Air Conditioners ◽  
Vibration Isolators ◽  
Large Size ◽  
Electron Microscopes

In recent years, with electron microscopes coming into wider use, their installation environments do not necessarily give their performance full play. Their environmental conditions include air-conditioners, magnetic fields, and vibrations. We report a jointly developed entirely new vibration isolator which is effective against the vibrations transmitted from the floor.Conventionally, large-sized vibration isolators which need the digging of a pit have been used. These vibration isolators, however, are large present problems of installation and maintenance because of their large-size.Thus, we intended to make a vibration isolator which1) eliminates the need for changing the installation room2) eliminates the need of maintenance and3) are compact in size and easily installable.

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