Effects of the total dose and duration of γ-irradiation on the growth responses and induced SNPs of a Cymbidium hybrid

2020 ◽  
Vol 96 (4) ◽  
pp. 545-551 ◽  
Author(s):  
Sang Hoon Kim ◽  
Yeong Deuk Jo ◽  
Jaihyunk Ryu ◽  
Min Jeong Hong ◽  
Byoung-Cheorl Kang ◽  
...  
Keyword(s):  
Total Dose ◽  
Growth Responses ◽  
Γ Irradiation

scholarly journals Efficiency of ademethionine in oxidative stress in tissues of irradiated rats

2021 ◽  
Vol 11 (6) ◽  
pp. 192-198
Author(s):  
G. F. Stepanov ◽  
L. O. Tereshchenko ◽  
E. V. Oleinik ◽  
G. S. Maryniuk ◽  
O. I. Budalenko ◽  
...  
Keyword(s):  
Total Dose ◽  
Control Level ◽  
Experimental Studies ◽  
Living Organism ◽  
Reduction Factor ◽  
Low Doses ◽  
Pyridine Nucleotides ◽  
Γ Irradiation ◽  
Low Intensity ◽  
Reduced Forms

Introduction. Ionizing radiation in low doses of low intensity causes prolonged activation of lipid per oxidation and depletion of the antioxidant system in a living organism. Moreover, Ademethionine is currently being considered as a promising antioxidant.Method. Experimental studies were carried out on 60 sexually mature male Wistar rats. The animals were irradiated in a total dose of 1Gy on a γ-therapeutic device AGAT-R No. 83 (isotope 60Co). At the end of the total dose, the rats were injected intraperitoneally with Heptral (ademethionine) after 15 minutes, 12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132, 144, 156 hours after radiation exposure at the rate of 10 mg / kg mass. After the introduction of Heptral, the animals were taken into the experiment after 24 hours, 3, 7, 15 days. In homogenates of the spleen and thymus of animals, the amount of oxidized and reduced forms of pyridine nucleotides was determined.Results. Chronic γ-irradiation in a total dose of 1Gy leads to a significant decrease in the content of reduced forms of pyridine nucleotides in the spleen and thymus of rats. Administration of Heptral to irradiated animals normalized oxidative homeostasis. So, on the 7th day of the experiment, the amount of oxidized forms of pyridine nucleotides in the spleen was 47.3% lower, and reduced - 36.3% higher than in animals that did not receive treatment. At the end of the observation period, the reduction coefficient of pyridine nucleotides in the spleen slightly differed from the control level. In comparison with irradiated animals, which were not injected with Heptral, the NADP content was lower by 70.3%, and NADPH2 - higher by 48.8%.Conclusion. The course administration of Heptral to irradiated animals leads to the normalization of the reduction factor of pyridine nucleotides. According to its mechanism of action, Heptral can be used in the complex treatment of low- intensity radiation injuries in low doses.

Modification of optical properties of PC-PBT/Cr2O3 and PC-PBT/CdS nanocomposites by gamma irradiation

2020 ◽  
Vol 92 (2) ◽  
pp. 20402
Author(s):  
Kaoutar Benthami ◽  
Mai ME. Barakat ◽  
Samir A. Nouh
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Band Gap ◽  
Color Difference ◽  
Band Gap Energy ◽  
Polybutylene Terephthalate ◽  
Γ Irradiation ◽  
Gap Energy ◽  
Vis Spectroscopy ◽  
Oxygen Atoms

Nanocomposite (NCP) films of polycarbonate-polybutylene terephthalate (PC-PBT) blend as a host material to Cr2O3 and CdS nanoparticles (NPs) were fabricated by both thermolysis and casting techniques. Samples from the PC-PBT/Cr2O3 and PC-PBT/CdS NCPs were irradiated using different doses (20–110 kGy) of γ radiation. The induced modifications in the optical properties of the γ irradiated NCPs have been studied as a function of γ dose using UV Vis spectroscopy and CIE color difference method. Optical dielectric loss and Tauc's model were used to estimate the optical band gaps of the NCP films and to identify the types of electronic transition. The value of optical band gap energy of PC-PBT/Cr2O3 NCP was reduced from 3.23 to 3.06 upon γ irradiation up to 110 kGy, while it decreased from 4.26 to 4.14 eV for PC-PBT/CdS NCP, indicating the growth of disordered phase in both NCPs. This was accompanied by a rise in the refractive index for both the PC-PBT/Cr2O3 and PC-PBT/CdS NCP films, leading to an enhancement in their isotropic nature. The Cr2O3 NPs were found to be more effective in changing the band gap energy and refractive index due to the presence of excess oxygen atoms that help with the oxygen atoms of the carbonyl group in increasing the chance of covalent bonds formation between the NPs and the PC-PBT blend. Moreover, the color intensity, ΔE has been computed; results show that both the two synthesized NCPs have a response to color alteration by γ irradiation, but the PC-PBT/Cr2O3 has a more response since the values of ΔE achieved a significant color difference >5 which is an acceptable match in commercial reproduction on printing presses. According to the resulting enhancement in the optical characteristics of the developed NCPs, they can be a suitable candidate as activate materials in optoelectronic devices, or shielding sheets for solar cells.

MICROPROPAGATION OF CHICKPEA FROM SHOOT TIP AND NODE SEGMENT

2018 ◽  
Vol 24 (2) ◽  
Author(s):  
J. D. BARSHILE
Keyword(s):  
Shoot Tip ◽  
Root Induction ◽  
Multiple Response ◽  
Ms Medium ◽  
Growth Responses ◽  
Rapid Multiplication ◽  
Micro Propagation ◽  
G 12 ◽  
Better Than

Present investigation was undertaken to standardize technique for in vitro micro-propagation of chickpea( Cicer arietinum ) cultivar Vishwas (Phule G 12). Micropropagation method for chickpea was established and this method enabled much more efficient propagation of plants. The present work was aimed at evolving a protocol for rapid multiplication of chickpea using micropropagation technique. Explants from shoot tip and node segment were cultured on MS medium supplemented with different concentrations of BAP and Kinetin (1.0 to 2.5 mg/l) and their growth responses like shooting were elucidated. The maximum multiple response was observed with 2 mg/l concentration of BAP from both types of explant. The highest number of shoots (12.5 ± 0.3) was achieved on MS medium with 2 mg/l BAP using node segments. The medium supplemented with 2 mg/l of BAP was found better than all other concentrations. Individual shoots were transferred to IBA and IAA (1.0-1.5 mg/l) for root induction. MS medium supplemented with 2 mg/l of IBA proved better for rooting. Rooted plantlets were successfully hardened in greenhouse and established in the pot.

ALTERNATIVE P-FERTILISERS FOR NORTHLAND SOILS

1986 ◽  
pp. 229-232
Author(s):  
P.W. Shannon
Keyword(s):  
Phosphate Rock ◽  
Growth Responses ◽  
Triple Superphosphate ◽  
Rock Phosphates ◽  
Distribution Costs ◽  
Phosphate Retention ◽  
Sechura Phosphate Rock ◽  
Local Product ◽  
Application Frequency ◽  
Chatham Rise Phosphorite

Increasing material, processing, and distribution costs have raised superphosphate prices to a point where many farms cannot support the costs of meeting maintenance phosphate requires men& Alternatives to superphosphate, particularly those that have lower processing costs and contain more P, may offer a solution to the problem provided they are agronomically as effective. Phosphate rock may indeed be such an alternative. Preliminary results from a series of five trials in Northland show that on soils of moderate P fertility, with low phosphate retention (PR) and high pH (5.9.6.0), initial pasture growth responses to rock phosphates are smaller than those from single or triple superphosphate. On one soil of higher PR and lower pH, the differences in yield between the rock-phosphates and the super. phosphates were smaller. Of the rock phosphates tested, Sechura and North Carolina (unground and ungranulated) tended to be more effective than ground and granulated Chatham Rise phosphorite. The effect on production of applying fertilisers once every three years, as opposed to annual applications is being investigated using triple superphosphate and Sechura phosphate rock. After two years, production levels appear largely unaffected by differences in application frequency. A comparison of locally-produced superphosphate with a reference standard showed that both performed similarly, indicating that the local product was of satisfactory quality.

Comparison of Growth Responses of 2-Day-Old Pigs to Streptomycin, Aureomycin, and Crude APF, Alone and in Combination with B12

1952 ◽  
Vol 11 (1) ◽  
pp. 97-102 ◽  
Author(s):  
B. E. Sheffy ◽  
R. H. Grummer ◽  
P. H. Phillips ◽  
G. Bohstedt
Keyword(s):  
Growth Responses

Safety and efficacy of stereotactic radiosurgery for tumors of the spine

2004 ◽  
pp. 413-418 ◽  
Author(s):  
Deborah L. Benzil ◽  
Mehran Saboori ◽  
Alon Y. Mogilner ◽  
Ronald Rocchio ◽  
Chitti R. Moorthy
Keyword(s):  
Spinal Cord ◽  
Single Dose ◽  
Pain Relief ◽  
Total Dose ◽  
Stereotactic Radiosurgery ◽  
Medical Center ◽  
Primary Tumors ◽  
Content Type ◽  
Increased Risk ◽  
Fine Print

Object. The extension of stereotactic radiosurgery treatment of tumors of the spine has the potential to benefit many patients. As in the early days of cranial stereotactic radiosurgery, however, dose-related efficacy and toxicity are not well understood. The authors report their initial experience with stereotactic radiosurgery of the spine with attention to dose, efficacy, and toxicity. Methods. All patients who underwent stereotactic radiosurgery of the spine were treated using the Novalis unit at Westchester Medical Center between December 2001 and January 2004 are included in a database consisting of demographics on disease, dose, outcome, and complications. A total of 31 patients (12 men, 19 women; mean age 61 years, median age 63 years) received treatment for 35 tumors. Tumor types included 26 metastases (12 lung, nine breast, five other) and nine primary tumors (four intradural, five extradural). Thoracic tumors were most common (17 metastases and four primary) followed by lumbar tumors (four metastases and four primary). Lesions were treated to the 85 to 90% isodose line with spinal cord doses being less than 50%. The dose per fraction and total dose were selected on the basis of previous treatment (particularly radiation exposure), size of lesion, and proximity to critical structures. Conclusions. Rapid and significant pain relief was achieved after stereotactic radiosurgery in 32 of 34 treated tumors. In patients treated for metastases, pain was relieved within 72 hours and remained reduced 3 months later. Pain relief was achieved with a single dose as low as 500 cGy. Spinal cord isodoses were less than 50% in all patients except those with intradural tumors (mean single dose to spinal cord 268 cGy and mean total dose to spinal cord 689 cGy). Two patients experienced transient radiculitis (both with a biological equivalent dose (BED) > 60 Gy). One patient who suffered multiple recurrences of a conus ependymoma had permanent neurological deterioration after initial improvement. Pathological evaluation of this lesion at surgery revealed radiation necrosis with some residual/recurrent tumor. No patient experienced other organ toxicity. Stereotactic radiosurgery of the spine is safe at the doses used and provides effective pain relief. In this study, BEDs greater than 60 Gy were associated with an increased risk of radiculitis.

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