Present results suggested upregulation of the photorespiratory pathway as a strategy to maintain the ribulose-1,5-bisphosphate regeneration for maintenance of photosynthesis under drought and salt stress. A pool size of the electron acceptors on reducing side of PSII and activity of water-splitting complex on the donor side of the PSII decreased during drought and salt stress. The maximum carboxylation rate, maximum electron transport rate, triosephosphate utilization efficiency, and mesophyll conductance decreased under drought and salt stress, while dark respiration increased. The maximum quantum efficiency of PSII and electron transport rate were lower in tobacco under drought and salt stress. Net CO 2 assimilation rate, stomatal conductance, intercellular CO 2 concentration and transpiration rate decreased significantly under drought and salt stress. The present study aimed to understand the photosynthetic responses and chlorophyll fluorescence transient in tobacco under drought and salt stress. RATHORE 1,2 1īiotechnology and Phycology Division, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific and Industrial Research (CSIR), Bhavnagar (Gujarat- 364001), India 2Īcademy of Scientific and Innovative Research, CSIR, New Delhi, India As of June 1, 2016, there had also been 20 medical device recalls identified by FDA.īesides Zimmer, companies that have had more than one recall this year, according to FDA, are Medtronic with four recalls, Abbott with two recalls, and Physio-Control with two recalls.Īmanda Pedersen is Qmed's news editor.Photosynthetica 2019, 57(1):61-74 | DOI: 10.32615/ps.2019.028 Photosystem photochemistry, prompt and delayed fluorescence, photosynthetic responses and electron flow in tobacco under drought and salt stress K. In total, FDA has reported 20 medical device recalls in 2017, which is consistent with the rate of device recalls last year. This is Zimmer's second recall this year that FDA has identified as a Class I recall, the first being a shoulder replacement device. Using the product could cause serious adverse health consequences such as chronic infections, long-term hospitalization due to additional surgeries, paralysis, and death, FDA noted.Īs part of the recall, Zimmer reminded surgeons that normal clinical monitoring is recommended for three to six months after surgery for any patient with the affected devices implanted. A failed test can indicate that a device contains potential harmful chemicals at amounts or levels that could be dangerous to the patient. The device is implanted into the patient's back and is designed to provide constant electrical stimulation to the surgical site.Ĭompanies use a cytotoxicity test as part of the biological evaluation of medical devices to ensure compatibility with the device and the human body. The devices being recalled are used during spinal fusion surgery to increase the possibility of permanently connecting two or more backbones together. Zimmer Biomet recalled its SpF PLUS-Mini and SpF XL IIb implantable spinal fusion stimulators after routine testing revealed harmful chemicals at levels that could be dangerous to the patient. Stephen Doherty, PhD, director of analytical chemistry at Toxikon Corp., will discuss the integration of risk analysis and chemical characterization at the MD&M East conference and expo, June 13-15, 2017, in New York City. The company initiated the recall on April 20 after discovering the problem during routine monitoring, and FDA identified it this week as a Class I recall, which is the agency's most serious type of recall. Zimmer Biomet is recalling its SpF PLUS-Mini and SpF XL llb implantable spinal fusion stimulators due to higher than allowed levels of potential harmful chemicals, which may be toxic to tissues or organs. Zimmer Biomet recalled two implantable spinal fusion stimulators after a routine cytotoxicity test indicated high levels of chemicals that could be toxic to tissues or organs.
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