Effect of Low Oxygen Level on Some Blood Parameter Levels of Fry Rainbow Trouts (Oncorhynchus Mykiss, W. 1792)

2010 ◽  
Author(s):  
Keleştemur
Keyword(s):  
Oncorhynchus Mykiss ◽  
Blood Parameter ◽  
Oxygen Level ◽  
Low Oxygen

A powerful hybrid puc operon promoter tightly regulated by both IPTG and low oxygen level

2010 ◽  
Vol 75 (4) ◽  
pp. 519-525 ◽  
Author(s):  
Zongli Hu ◽  
Zhiping Zhao ◽  
Yu Pan ◽  
Yun Tu ◽  
Guoping Chen
Keyword(s):  
Oxygen Level ◽  
Low Oxygen

scholarly journals Effects of oxygen levels and a Lactobacillus plantarum strain on mortality and immune response of chickens at high altitude

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Lihong Wang ◽  
Guanhua Fu ◽  
Suozhu Liu ◽  
Long Li ◽  
Xin Zhao
Keyword(s):  
Immune Response ◽  
Immune Responses ◽  
High Altitude ◽  
Basal Diet ◽  
The Other ◽  
Control Group ◽  
Oxygen Level ◽  
Low Oxygen ◽  
Improve Health Status ◽  
Improve Health

Abstract Chickens reared in high altitude regions suffer from a high mortality, possibly due to poor immune responses induced by hypoxia. This experiment was conducted to evaluate whether increasing the oxygen level or administration of a probiotic could improve mortality and immune response of chickens at high altitude (2,986 m above the sea level). One-d-old chickens were randomly allocated to 1 of 6 treatments in a 2 × 3 factorial arrangement. The first factor was the oxygen level (low and high), while the second factor was the diet (basal diet, basal diet containing aureomycin, and basal diet plus L. plantarum). Increasing the oxygen level significantly reduced the mortality and improved immune responses. The levels of IgA, IgG, IL-10 and anti-BSA antibodies were significantly higher, while IL-1β, LITAF were significantly lower in chickens reared in the high-oxygen room. In the low-oxygen room, L. plantarum significantly decreased the mortality of chickens compared with the other 2 groups. Moreover, L. plantarum significantly increased the levels of IgA, anti-BSA antibodies, IL-10 and decreased IL-1β, LITAF compared with the control group. These results demonstrated that increasing oxygen level or administration of L. plantarum can improve health status of chickens in high altitude regions.

scholarly journals Responses of cut carnations to a low oxygen level in the ambient atmosphere

2011 ◽  
Vol 30 (No. 2) ◽  
pp. 51-55
Author(s):  
J. Goliáš ◽  
F. Kobza
Keyword(s):  
Storage Temperature ◽  
Dianthus Caryophyllus ◽  
Flower Senescence ◽  
Ambient Atmosphere ◽  
Physiological Effects ◽  
Sucrose Content ◽  
Oxygen Level ◽  
Low Oxygen ◽  
Trace Concentration ◽  
Exponential Decrease

Carnation (Dianthus caryophyllus L.) flowers were subjected to low oxygen to investigate the physiological effects on flower senescence. The effect of ultra low oxygen (0.6–0.8%) led to low accumulation of ethanol that amounted to 8 mg/l in the tissue pulp in 19 days. The content of acetaldehyde showed an exponential decrease in its previous value after a subsequent exposition of cut carnations to air but still at a cold storage temperature. The content of sugars such as sucrose, glucose and fructose linearly decreased with small differences between ULO and RA conditions. The sucrose content was at a trace concentration. Visual symptoms of injury were observed in ULO conditions after 19 days of storage when brown spots appeared at the top of petals.  

scholarly journals Life at stable low oxygen levels: adaptations of animals to oceanic oxygen minimum layers.

1998 ◽  
Vol 201 (8) ◽  
pp. 1223-1232 ◽  
Author(s):  
J J Childress ◽  
B A Seibel
Keyword(s):  
Water Column ◽  
Aerobic Metabolism ◽  
Oxygen Level ◽  
Low Oxygen ◽  
Oxygen Levels ◽  
Surface Areas ◽  
Partial Pressures ◽  
Stable Conditions ◽  
Consumption Rates ◽  
Oxygen Minimum

Zones of minimum oxygen level are found at intermediate depths in most of the world's oceans and, although the oxygen partial pressure in some of these 'oxygen minimum layers' is only a fraction of a kilopascal, populations of pelagic metazoans exist there. These oxygen minimum layers are areas of the water column and the associated benthos with stable conditions of continuously low oxygen level and low temperature at intermediate depths (400-1000 m depth) over vast areas. Off California, where PO2 at the oxygen minimum is 0.8 kPa, there are abundant populations of animals both in the water column and on the bottom. Farther to the south in the eastern tropical Pacific, oxygen partial pressures of less than approximately 0.4 kPa result in very low biomasses and diversity of animals at minimum layer depths. At the minimum oxygen levels found off California, most animals which inhabit the minimum zones appear to support their routine metabolic demands via aerobic metabolism. They do this by being very effective at removing oxygen from water. Among the adaptations of pelagic crustaceans to these conditions are: (1) enhanced ventilatory abilities, (2) enhanced percentage removal of O2 from the ventilatory stream, (3) large gill surface areas, (4) short diffusion distances from the water to the blood, and (5) hemocyanin respiratory proteins with a very high affinity for O2, high cooperativity and large Bohr effects. The lower O2 consumption rates of many deeper-living species are also functionally adaptive in that they facilitate aerobic survival at low PO2. However, they are not adaptations to the minimum layer, since similarly low rates are found in the same and comparable species living at the same depths in regions without well-developed minima, and these animals are unable to survive at the low PO2 values of the minima. While anaerobic metabolism may be important for metabolic rates above the routine level for most animals in the minimum layer, there is little evidence for the use of sustained anaerobiosis in the species studied. In summary, given the stable presence of very low O2 levels in the minima, the primary adaptations of animals living within them are those that support aerobic metabolism by giving the animals remarkable abilities to extract O2 from water. These abilities are notably better than those of animals adapted to unstable hypoxic environments, such as intertidal mudflats, while the latter animals rely to a much greater extent on anaerobiosis and perhaps on metabolic suppression to survive periods of anoxia.

Microneedle-mediated delivery of MIL-100(Fe) as a tumor microenvironment-responsive biodegradable nanoplatform for O2 evolving chemophototherapy

2021 ◽  
Author(s):  
Sulan Luo ◽  
Yiting Zhao ◽  
Kewei Pan ◽  
Yixian Zhou ◽  
Guilan Quan ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Tumor Microenvironment ◽  
Antitumor Efficacy ◽  
Oxygen Level ◽  
Low Oxygen ◽  
Physiological Conditions

Low oxygen level in tumors significantly reduces antitumor efficacy of photodynamic therapy (PDT). Provision of O2 and monomeric hydrophobic photosensitizers (PSs) under physiological conditions would greatly help to shrink malignant...

scholarly journals Reduced oxygen concentration during human IVF culture improves embryo utilization and cumulative pregnancy rates per cycle

2020 ◽  
Vol 2020 (1) ◽  
Author(s):  
Aafke P A Van Montfoort ◽  
Eus G J M Arts ◽  
Lydia Wijnandts ◽  
Alexander Sluijmer ◽  
Marie-José Pelinck ◽  
...  
Keyword(s):  
Live Birth ◽  
Embryo Culture ◽  
Oxygen Level ◽  
Low Oxygen ◽  
Birth Rates ◽  
Oxygen Levels ◽  
Live Birth Rates ◽  
Oxygen Groups ◽  
Oxygen Group ◽  
Human Ivf

Abstract STUDY QUESTION Do different oxygen levels during human IVF embryo culture affect embryo utilization, cumulative IVF success rates per cycle and neonatal birthweight? SUMMARY ANSWER After 2 days of culture, a lower oxygen level (5%) leads to more good-quality embryos and more embryos that can be cryopreserved, and thereby to a higher cumulative live birth rate per cycle when compared to embryo culture in 20% oxygen, while birthweights are similar. WHAT IS KNOWN ALREADY Several studies have compared IVF outcome parameters after embryo culture in a more physiological level of 5% oxygen and the atmospheric level of 20%. Although there is consensus that embryo development improves in 5% oxygen, effects on pregnancy and live birth rates are mainly seen in blastocyst, but not cleavage-stage transfers. A major drawback of these studies is that only fresh embryo transfers were included, not taking additional frozen-thawed transfers from these cycles into account. This might have underestimated the effects of oxygen level, especially in cleavage-stage embryo transfers. Furthermore, little is known about the effect of oxygen level during culture on birthweight. STUDY DESIGN, SIZE, DURATION This is a cohort study in 871 consecutive patients who had an IVF cycle between January 2012 and December 2013, and 5–7 years follow-up to allow transfer of frozen-thawed embryos. Based on daily availability of positions in the incubators, all oocytes and embryos of one cycle were allocated to one of the three incubators with traditional ambient oxygen levels (6% CO2 and 20% O2 in air), or to a fourth incubator that was adjusted to have low oxygen levels of 5% (6% CO2, 5% O2 and 89% N2). Embryos were cultured under 5 or 20% oxygen until Day 2 or 3, when embryos were transferred or cryopreserved, respectively. Clinical and other laboratory procedures were similar in both groups. PARTICIPANTS/MATERIALS, SETTING, METHODS To compare embryo characteristics and (cumulative) pregnancy outcomes between the two oxygen groups, for each patient only the first cycle in the study period was included in the analysis, resulting in 195 cycles in the 5% group (1627 oocytes) and 676 in the 20% oxygen group (5448 oocytes). Embryo characteristics were analysed per cycle and per embryo and were corrected for maternal age, cycle rank order, fertilization method (IVF or ICSI) and cause of subfertility. Perinatal data from the resulting singletons (n = 124 after fresh and 45 after frozen-thawed embryo transfer) were collected from delivery reports from the hospitals or midwife practices. MAIN RESULTS AND THE ROLE OF CHANCE In the 5% oxygen group, there were significantly more embryos of good quality (45.8 versus 30.9% in the 20% group, adjusted odds ratio (OR) [95% CI] = 1.9 [1.6–2.4]). This did not result in higher live birth rates per cycle, but after fresh transfers more good-quality spare embryos could be cryopreserved (46.1 versus 29.7%, adjusted OR [95% CI] = 2.0 [1.7–2.5]). After a follow-up period of 5–7 years, in which 82.4% of the cryopreserved embryos from the 5% oxygen group and 85.4% from the 20% oxygen group were thawed, the percentage of patients with at least one live birth resulting from the study cycle was significantly higher in the low oxygen group (adjusted OR [95% CI] = 1.5 [1.01–2.2]). In 124 live born singletons from fresh embryo transfers and in 45 from transfers of cryopreserved embryos, birthweight was similar in both oxygen groups after correction for confounding factors. LIMITATIONS, REASONS FOR CAUTION This is a retrospective study, and treatment allocation was not randomised. The study was not powered for a predefined birthweight difference. With the number of live births in our study, small differences in birthweight might not have been detected. The selection of embryos to be cryopreserved was based on embryo morphology criteria that might be different in other clinics. WIDER IMPLICATIONS OF THE FINDINGS Improved embryo utilization by more cryopreservation leading to higher cumulative live birth rates per cycle favours the use of 5% instead of 20% oxygen during human IVF embryo culture. This study also demonstrates that for comparison of different IVF treatment regimens, the cumulative outcome, including transfers of fresh and frozen-thawed embryos, is to be preferred instead of analysis of fresh embryo transfers only. STUDY FUNDING/COMPETING INTEREST(S) No external funding was received for this study. None of the authors has a conflict of interest to declare. TRIAL REGISTRATION NUMBER NA

Some Effects of Temporary Exposure to Low Dissolved Oxygen Levels on Pacific Salmon Eggs

1958 ◽  
Vol 15 (2) ◽  
pp. 229-250 ◽  
Author(s):  
D. F. Alderdice ◽  
W. P. Wickett ◽  
J. R. Brett
Keyword(s):  
Oxygen Consumption ◽  
Dissolved Oxygen ◽  
Oxygen Demand ◽  
Oxygen Availability ◽  
Oncorhynchus Keta ◽  
Hatching Rate ◽  
Oxygen Level ◽  
Low Oxygen ◽  
Low Dissolved Oxygen ◽  
Oxygen Levels

Eggs of the chum salmon (Oncorhynchus keta) were exposed to various constant levels of dissolved oxygen for a period of seven days. The procedure was repeated with fresh egg samples at various developmental stages. Temperatures were constant at 10 °C. from fertilization to hatching. Estimates of oxygen consumption uninhibited by low dissolved oxygen levels were obtained at various stages of egg development for whole eggs and also on the basis of the weight of larvae, excluding the yolk. Eggs were most sensitive to hypoxia between 100–200 Centigrade degree-days and compensated for reduced oxygen availability by reducing the oxygen demand and rate of development. Very low oxygen levels at early incubation stages resulted in the production of monstrosities. At about the time the circulatory system becomes functional the compensatory reduction in rate of growth under hypoxial conditions is reduced, but eggs no longer survive extreme hypoxial conditions. Eggs subjected to low dissolved oxygen levels just prior to hatching hatch prematurely at a rate dependent on the degree of hypoxia. The maximum premature hatching rate corresponded approximately with the median lethal oxygen level. Estimated median lethal levels rose slowly from fertilization to hatching. Oxygen consumption per egg rose from fertilization to hatching while the consumption per gram of larval tissue declined from a high to a low level at about the time of blastopore closure. Subsequently, a slight rise in the rate occurred up to a level which was more or less constant to hatching. "Critical" dissolved oxygen levels were calculated and they appear to define the oxygen level above which respiratory rate is unmodified by oxygen availability. Critical levels ranged from about 1 p.p.m. in early stages to over 7 p.p.m. shortly before hatching.

scholarly journals Severe ARDS Complicating an Acute Intentional Cresol Poisoning

2019 ◽  
Vol 2019 ◽  
pp. 1-3
Author(s):  
Djoudline Doughmi ◽  
Lamiae Bennis ◽  
Aicha Berrada ◽  
Ali Derkaoui ◽  
Abdelkrim Shimi ◽  
...  
Keyword(s):  
Intensive Care ◽  
Gastrointestinal Endoscopy ◽  
Hepatic Injury ◽  
Distress Syndrome ◽  
Psychiatric Evaluation ◽  
Shortness Of Breath ◽  
Oxygen Level ◽  
Low Oxygen ◽  
Phenol Derivative ◽  
Corrosive Injury

Cresol is a phenol derivative used as a disinfectant that may cause gastrointestinal corrosive injury, central nervous system, cardiovascular disturbances, renal, and hepatic injury following intoxication. We present a case of a female patient who was admitted to the emergency department after ingesting an unknown amount of cresol; she was admitted with tachypnea, shortness of breath with low oxygen level in the blood. She did not develop hepatic or renal dysfunction. The gastrointestinal endoscopy was performed and showed esophagus and gastric erosins only. The patient was sedated and ventilated for 7 days. After receiving supportive intensive care, the patient recovered and was sent for psychiatric evaluation. Cresol intoxication can be fatal, and cause a respiratory failure with an acute respiratory distress syndrome (ARDS), hepatic, and renal injury. This shows the importance of intensive care in the management of cresol poisoning.

Low oxygen level increases proliferation and metabolic changes in bovine granulosa cells

2016 ◽  
Vol 437 ◽  
pp. 75-85 ◽  
Author(s):  
Shogo Shiratsuki ◽  
Tomotaka Hara ◽  
Yasuhisa Munakata ◽  
Koumei Shirasuna ◽  
Takehito Kuwayama ◽  
...  
Keyword(s):  
Granulosa Cells ◽  
Metabolic Changes ◽  
Oxygen Level ◽  
Low Oxygen
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