scholarly journals Acute Toxicity Bioassay of a Pyrethroid Pesticide Bifenthrin to the Asian stinging Catfish, Heteropneustes Fossilis (Bloch)

2021 ◽  
Vol 16 (1) ◽  
pp. 250-258
Author(s):  
Shubhajit Saha ◽  
Dip Mukherjee ◽  
Kishore Dhara ◽  
Nimai Chandra Saha
Keyword(s):  
Significant Variation ◽  
Gradual Increase ◽  
Type I ◽  
Heteropneustes Fossilis ◽  
Toxicity Bioassay ◽  
Short Term ◽  
Pyrethroid Pesticide ◽  
Treated Fish ◽  
The Hours ◽  
Higher Doses

Bifenthrin is a type-I synthetic neopyrethroid pesticide having eight different stereoisomers. The current study aims to assess the short-term toxic effect of Bifenthrin to freshwater fish, Heteropneustes fossilis. The 24, 48, 72 and 96h LC50 values of bifenthrin to H. fossilis were 4.82, 4.47, 3.54 and 3.40 µg/l respectively. There was a significant variation (p<0.05) in the mortality of the treated fish exposed to bifenthrin with respect to the control at all the hours of exposure. A significant variation (p<0.05) between rate of mortality of H. fossilis and time slots (24-96h) was recorded for the final selected doses of bifenthrin except 4.0, 4.5 and 5.5 µg/l concentration of the toxicant. A vigorous mucous secretion and hyper-excitability was observed in the fish at the higher doses of bifenthrin specifically at 24h and 48h time slots. There was a profound loss in equilibrium of the treated fish particularly at the higher doses at 72h and 96h time slots. The gradual increase in dose of bifenthrin resulted in significant increase (p<0.05) in opercular movement of the fish with respect to the control. On the other hand, opercular movement showed a significant increase (p<0.05) with the advancement of time for all the treated doses. Therefore, bifenthrin is indicated to be very strongly toxic to fish.

Effects of long-term optimization and short-term deterioration of glycemic control on glucose counterregulation in type I diabetes mellitus

Diabetes ◽  
1984 ◽  
Vol 33 (4) ◽  
pp. 394-400 ◽  
Author(s):  
G. Bolli ◽  
P. De Feo ◽  
S. De Cosmo ◽  
G. Perriello ◽  
G. Angeletti ◽  
...  
Keyword(s):  
Diabetes Mellitus ◽  
Glycemic Control ◽  
Type I Diabetes ◽  
Type I Diabetes Mellitus ◽  
Type I ◽  
Short Term

Sustained normoglycemia in newly diagnosed type I diabetic subjects. Short-term effects and one-year follow-up

Diabetes ◽  
1984 ◽  
Vol 33 (10) ◽  
pp. 995-1001 ◽  
Author(s):  
K. Perlman ◽  
R. M. Ehrlich ◽  
R. M. Filler ◽  
A. M. Albisser
Keyword(s):  
Type I ◽  
Newly Diagnosed ◽  
Short Term ◽  
One Year ◽  
Short Term Effects

scholarly journals Non pharmacological high-intensity ultrasound treatment of human dermal fibroblasts to accelerate wound healing

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jeong Yu Lee ◽  
Dae-Jin Min ◽  
Wanil Kim ◽  
Bum-Ho Bin ◽  
Kyuhan Kim ◽  
...  
Keyword(s):  
Wound Healing ◽  
High Intensity ◽  
Mapk Pathway ◽  
Dermal Fibroblasts ◽  
Ultrasound Treatment ◽  
Type I ◽  
Human Dermal Fibroblasts ◽  
Short Term ◽  
High Intensity Ultrasound ◽  
Extracellular Matrix Components

AbstractInspired by the effectiveness of low-intensity ultrasound on tissue regeneration, we investigated the potential effect of short-term high-intensity ultrasound treatment for acceleration of wound healing in an in vitro wound model and dermal equivalent, both comprising human dermal fibroblasts. Short-term ultrasound of various amplitudes significantly increased the proliferation and migration of fibroblasts and subsequently increased the production of the extracellular matrix components fibronectin and collagen type I, both of which are important for wound healing and are secreted by fibroblasts. In addition, ultrasound treatment increased the contraction of a fibroblast-embedded three-dimensional collagen matrix, and the effect was synergistically increased in the presence of TGF-β. RNA-sequencing and bioinformatics analyses revealed changes in gene expression and p38 and ERK1/2 MAPK pathway activation in the ultrasound-stimulated fibroblasts. Our findings suggest that ultrasound as a mechanical stimulus can activate human dermal fibroblasts. Therefore, the activation of fibroblasts using ultrasound may improve the healing of various types of wounds and increase skin regeneration.

scholarly journals Nanomedicine Reformulation of Chloroquine and Hydroxychloroquine

Molecules ◽  
2020 ◽  
Vol 26 (1) ◽  
pp. 175
Author(s):  
David M. Stevens ◽  
Rachael M. Crist ◽  
Stephan T. Stern
Keyword(s):  
Safety Evaluation ◽  
Therapeutic Index ◽  
Short Term ◽  
Tissue Concentrations ◽  
History Of ◽  
History Of Use ◽  
Novel Applications ◽  
Therapeutic Doses ◽  
Extensive Clinical Experience ◽  
Higher Doses

The chloroquine family of antimalarials has a long history of use, spanning many decades. Despite this extensive clinical experience, novel applications, including use in autoimmune disorders, infectious disease, and cancer, have only recently been identified. While short term use of chloroquine or hydroxychloroquine is safe at traditional therapeutic doses in patients without predisposing conditions, administration of higher doses and for longer durations are associated with toxicity, including retinotoxicity. Additional liabilities of these medications include pharmacokinetic profiles that require extended dosing to achieve therapeutic tissue concentrations. To improve chloroquine therapy, researchers have turned toward nanomedicine reformulation of chloroquine and hydroxychloroquine to increase exposure of target tissues relative to off-target tissues, thereby improving the therapeutic index. This review highlights these reformulation efforts to date, identifying issues in experimental designs leading to ambiguity regarding the nanoformulation improvements and lack of thorough pharmacokinetics and safety evaluation. Gaps in our current understanding of these formulations, as well as recommendations for future formulation efforts, are presented.

Osmotic and ionic effects of NaCl on germination, early seedling growth, and ion content of Atriplex halimus (Chenopodiaceae)

2002 ◽  
Vol 80 (3) ◽  
pp. 297-304 ◽  
Author(s):  
Mohammed Bajji ◽  
Jean-Marie Kinet ◽  
Stanley Lutts
Keyword(s):  
Calcium Concentration ◽  
Deionized Water ◽  
Ion Content ◽  
Short Term ◽  
Atriplex Halimus ◽  
Early Seedling Growth ◽  
Significant Difference ◽  
Early Seedling ◽  
Ionic Effects ◽  
Higher Doses

The effects of salt and osmotic stresses on the germination processes in seeds of the perennial halophyte species Atriplex halimus L. were compared using iso-osmotic concentrations of NaCl and mannitol. The lowest stress intensity delayed germination, while higher doses of NaCl and mannitol reduced final germination percentages. No significant difference occurred between the effects of these solutes on germination percentages or seedling dry weights. At an external osmotic potential of –0.7 MPa, however, the water content of mannitol-treated seedlings was reduced compared to that of seedlings that developed from NaCl-exposed seeds. The K, Mg, and Pi content decreased in seedlings that developed from mannitol-treated seeds while calcium concentration was strongly reduced in those arising from NaCl-treated seeds. Inhibited seeds were able to germinate at levels similar to those of the control after rinsing in deionized water and imbibition in control conditions. Seedlings produced from NaCl pre-treated seeds had a lower Ca and a higher Na content than control seedlings. The effect of salinity on the germination phase of development is mainly due to its osmotic component, and inhibition of germination is reversible. Both salt and osmotic stresses may have an impact on the mobilization of minerals from the seeds to the young seedling, but this effect does not have any consequence on growth processes analysed on a short-term basis.Key words: Atriplex halimus, halophyte, osmotic stress, recovery of seed germination, salinity.

An analysis of lethal and sublethal interactions among type I and type II pyrethroid pesticide mixtures using standardHyalella aztecawater column toxicity tests

2016 ◽  
Vol 35 (10) ◽  
pp. 2542-2549 ◽  
Author(s):  
Krista Callinan Hoffmann ◽  
Linda Deanovic ◽  
Inge Werner ◽  
Marie Stillway ◽  
Stephanie Fong ◽  
...  
Keyword(s):  
Toxicity Tests ◽  
Type I ◽  
Type Ii ◽  
Pesticide Mixtures ◽  
Pyrethroid Pesticide

scholarly journals The amounts of rat liver cyclic AMP-dependent protein kinase I and II are differentially regulated by diet

1988 ◽  
Vol 256 (2) ◽  
pp. 447-452 ◽  
Author(s):  
R Ekanger ◽  
O K Vintermyr ◽  
S O Døskeland
Keyword(s):  
Protein Kinase ◽  
Cyclic Amp ◽  
Protein Restriction ◽  
Type I ◽  
Short Term ◽  
Rat Hepatocyte ◽  
Dependent Protein Kinase ◽  
Key Enzyme ◽  
Dependent Protein ◽  
Fasted Rats

1. The fluctuations in rat hepatocyte volume and protein content in response to dietary perturbations (starvation, protein restriction, refeeding) were accompanied by corresponding fluctuations in the amount of the regulatory (R) and catalytic (C) subunits of cyclic AMP-dependent protein kinase. Thus the intracellular concentration of this key enzyme was adjusted to be near constant. 2. The adjustment of cellular R was accomplished almost exclusively by regulating cytosolic RI (R subunit of type I kinase). The preferential down-regulation of cytosolic RI in response to starvation/protein restriction indicates that particulate RI and cytosolic as well as particulate RII are more resistant to breakdown during general catabolism in the hepatocyte. 3. The diet-induced fluctuations of kinase subunits were uniformly distributed in all populations of parenchymatous hepatocytes, regardless of their size and density. It is thus possible to isolate hepatocytes with uniformly altered RI/RII ratio from livers of rats with different feeding regimens. 4. The binding of endogenous cyclic AMP to RI and RII was similar in livers with high RI/RII ratio (fed rats) and low RI/RII ratio (fasted rats) as well as in hepatocytes isolated from fasted rats. Under the conditions of the experiment (short-term stimulation by glucagon), therefore, neither the dietary state nor the RI/RII ratio seemed to affect the apparent affinity of the isoreceptors for cyclic AMP. However, RI appeared to show a slightly higher co-operativity of intracellular cyclic AMP binding than did RII in all states.

scholarly journals Institutional Investor Attention and Firm Disclosure

2020 ◽  
Vol 95 (6) ◽  
pp. 1-21 ◽  
Author(s):  
Inna Abramova ◽  
John E. Core ◽  
Andrew Sutherland
Keyword(s):  
Significant Variation ◽  
Information Quality ◽  
Institutional Ownership ◽  
Institutional Investor ◽  
Short Term ◽  
Investor Attention ◽  
Bid Ask Spread ◽  
Abnormal Volume ◽  
Passive Investors ◽  
Jel Classifications

ABSTRACT We study how short-term changes in institutional owner attention affect managers' disclosure choices. Holding institutional ownership constant and controlling for industry-quarter effects, we find that managers respond to attention by increasing the number of forecasts and 8-K filings. Rather than alter the decision of whether to forecast or to provide more informative disclosures, attention causes minor disclosure adjustments. This variation in disclosure is primarily driven by passive investors. Although attention explains significant variation in the quantity of disclosure, we find little change in abnormal volume and volatility, the bid-ask spread, or depth. Overall, our evidence suggests that management responds to temporary institutional investor attention by making disclosures that have little effect on information quality or liquidity. JEL Classifications: G23; G32; G34; G12; G14.

Short-term high-fat diet induces muscle fiber type-selective anabolic resistance to resistance exercise

2021 ◽  
Author(s):  
Satoru Ato ◽  
Takahiro Mori ◽  
Yuki Fujita ◽  
Taiga Mishima ◽  
Riki Ogasawara
Keyword(s):  
Insulin Resistance ◽  
Resistance Exercise ◽  
High Fat Diet ◽  
Muscle Protein ◽  
Fiber Type ◽  
Type I ◽  
High Fat ◽  
Short Term ◽  
Anabolic Resistance ◽  
Mtorc1 Activation

Chronic obesity and insulin resistance are considered to inhibit contraction-induced muscle hypertrophy, through impairment of mTORC1 and muscle protein synthesis (MPS). A high-fat diet is known to rapidly induce obesity and insulin resistance within a month. However, the influence of a short-term high-fat diet on the response of mTORC1 activation and MPS to acute resistance exercise (RE) is unclear. Thus, the purpose of this study was to investigate the effect of a short-term high-fat diet on the response of mTORC1 activation and MPS to acute RE. Male Sprague-Dawley rats were randomly assigned to groups and fed a normal diet (ND), high-fat diet (HFD 4wk), or pair feed (PF 4wk) for 4 weeks. After dietary habituation, acute RE was performed on the gastrocnemius muscle via percutaneous electrical stimulation. The results showed that 4 weeks of a high fat-diet induced intramuscular lipid accumulation and insulin resistance, without affecting basal mTORC1 activity or MPS. The response of RE-induced mTORC1 activation and MPS was not altered by a high-fat diet. On the other hand, analysis of each fiber type demonstrated that response of MPS to an acute RE was disappeared specifically in type I and IIa fiber. These results indicate that a short-term high-fat diet causes anabolic resistance to acute RE, depending on the fiber type.

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