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Synthesis of new heteroleptic strontium complexes
George, Sheby Mary,Kim, Hyo-Suk,Lah, Myoung Soo,Park, Bo Keun,Kim, Chang Gyoun,Chung, Taek-Mo The Royal Society of Chemistry 2014 Dalton Transactions Vol.43 No.38
<P>A series of heteroleptic strontium complexes (<B>1–9</B>) using a combination of different aminoalkoxides and 2,2,6,6-tetramethyl-3,5-heptanedionate (tmhd) were prepared to examine the effect of the bulkiness and coordination ability of the aminoalkoxide ligand in these complexes as well as potential strontium precursors. All complexes were characterized by FT-IR, FT-NMR, elemental analyses, and thermo-gravimetric (TG) analyses. The crystal structure analyses of <B>1</B>, <B>2</B>, <B>4</B>, and <B>5</B> demonstrate their stability in the dimer form and the unwillingness of the strontium atom to form more than six coordination bonds in these complexes. The complex <B>5</B> shows an unusual picture: the existence of one hexa-coordinated and one penta-coordinated strontium atom side by side in its dimer structure. The introduction of ether groups as coordination sites in complexes <B>6–9</B> led to a decrease in steric hindrance which resulted in the formation of the complex <B>7</B> as a tetramer. The complex <B>7</B> shows a unique Sr<SUB>4</SUB>O<SUB>4</SUB> cubane core where oxygen atoms undergo μ<SUB>3</SUB>-bridging between strontium atoms. The TG analyses show that the complexes exhibit a step-wise decomposition character, with the major mass losses in the region 150–400 °C.</P> <P>Graphic Abstract</P><P>Synthesis of heteroleptic strontium complexes containing aminoalkoxide and β-diketonate ligands was demonstrated. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4dt00689e'> </P>
Registration of BBNJ Research Activities: A Move towards Transparency in Research Governance
Mary George,Anneliz R. George 이준국제법연구원 2018 Journal of East Asia and International Law Vol.11 No.1
The Prep Com recommended in July that the UNGA initiate a negotiating conference on areas beyond national jurisdiction. It is widely expected to make such a decision. Then, the long haul negotiation will begin. The 1982 UN Convention on the Law of the Sea does not regulate marine genetic resources in areas beyond the national jurisdiction of States (BBNJ). Part XIII of the Convention could accommodate BBNJ research, but not its governance. The triangulation of three factors-the interim absence of an international framework for governance of BBNJ research, an indirect reference to this issue in the on-going BBNJ deliberations on access and benefit sharing and an interim laissez-faire attitude in BBNJ exploration and exploitation-leads to a need for transparency in governance of BBNJ research activities. To address this lacuna, a United Nations Register on BBNJ Research Activities is recommended, encouraging scientists from all regions including Asia to engage in BBNJ research.
Laminin-1 Phosphorylation by Protein Kinase A : Effect on self assembly and heparin binding
Koliakos, George,Koliakos, Kokkona Kouzi,Triantos, Athanasios,Trachana, Varvara,Kavoukopoulos, Evaggelos,Gaitatzi, Mary,Dimitriadou, Aphrodite 생화학분자생물학회 2001 BMB Reports Vol.33 No.5
Incubation of purified lamininl-nidogenl complexes with [γ-^(32)P]-ATP in the presence of the catalytic subunit of the protein kinase A (CAMP-dependent protein kinase) resulted in the phosphoryla6on of the alpha chain of laminin-1 and of the nidogen-1 molecule. Aminoacid electrophoresis indicated that phosphate was incorporated on serine residues. The phosphorylation effect of laminin-1 on the process of self assembly was studied by turbidometry In these experiments, the phosphorylated laminin-1 showed a reduced maximal aggregatjon capacity in comparison to the non-phosphorylated molecule. Examination of the laminin1 network under the electron microscope showed that the phosphorylated sample formed mainly linear extended oligomers, in contrast to controls that formed large and dense multimeric aggregates. Heparin binding on phosphorylated laminin-1 in comparison to controls was also tested using solid-phase binding assays. The results indicated an enhanced heparin binding to the phosphorylated protein. The results of this study indicate that lamininl-nidogenl is a substrate for protein kinase A in vitro. This phosphorylation had an obvious influence on the lamininl-nidogenl network formation and the heparin binding capacity of this molecule. However, further studies are needed to investigate whether or not this phenomenon could play a role in the formation of the structure of basement membranes in vivo.
A sea lion optimized microstrip patch antenna for enhancing the energy efficiency of the WSN
Robin George,T. Anita Jones Mary 대한공간정보학회 2023 Spatial Information Research Vol.31 No.4
There is a growing trend toward the use of intelligent Wireless Sensor Networks for a variety of applications (WSNs). One of the main difficulties with WSNs is energy efficiency (EE). For energy saving, the directional antennas (Das) utilization is radiated in a specified direction but they reduce beam width by focusing power in that direction. Consequently, for enhancing EE and the longevity of the network, a low-powered double T slotted Micro Strip Patch Antenna (MSPA) was proposed in this paper. In the ‘4’ phases, the antenna is designed. Along with this, a new directional ‘2’ T-shaped MSPA with the aim of enhancing EE is designed. The initial parameters of the designed antenna are fed into the Sea Lion Optimization Algorithm to acquire an optimal parameter for obtaining a better frequency range. The proposed model attains the return loss of −19.2db, a gain of 2.5db, and directivity of 5.79db when contrasted with prevailing models. By achieving this, the paper exhibits the developed system’s superiority and could be a well-energy-efficient antenna in WSN. To encompass building an optimal antenna for WSNs, the work can be enlarged in the future by utilizing meta-material structure gain.
Impact of upper eyelid surgery on symptom severity and frequency in benign essential blepharospasm
Hannah Mary Timlin,Kailun Jiang,Daniel George Ezra 대한파킨슨병및이상운동질환학회 2021 Journal Of Movement Disorders Vol.14 No.1
Motor and non-motor symptoms (NMS) negatively impact the health-related quality of life (HRQoL) for individuals with Parkinson’s disease (PD), as well as their caregivers. NMS can emerge decades prior to the manifestation of motor symptoms but often go unrecognized and therefore untreated. To guide clinical management, we surveyed differences and identified factors that influence HRQoL in a cohort of PD patients and family caregivers.PD patients reported decreased HRQoL, with both motor symptoms and NMS negatively impacting HRQoL. Our findings support the routine clinical screening of HRQoL in PD patients to identify and address modifiable factors.
Varghese George,Thomas Roshan Marie 대한비과학회 2022 Journal of rhinology Vol.29 No.1
The transseptal approach to the maxillary sinus has been described for resection of extensive tumours of the nose and paranasal sinuses. We describe a modification of this method in a patient diagnosed with inverted papilloma for which he had undergone two previous operations. This method provides complete access to the maxillary sinus, particularly the anterior wall, to provide adequate reach and ensure complete removal of tumours. We describe a technique modifying the existing transseptal approach used as an adjunct to prelacrimal recess approach, wherein a hemitransfixation incision placed in the contralateral nasal cavity along the septum provides access to the maxillary sinus with angled instruments. This modified transseptal approach provided better reach and access to the maxillary sinus. Postoperatively, there was no evidence of septal scarring or perforation and no evidence of lesion recurrence. Our technique is an easy modification to the transseptal approach that is a useful tool to access hidden areas of the maxillary sinus without associated morbidity. The transseptal approach to the maxillary sinus has been described for resection of extensive tumours of the nose and paranasal sinuses. We describe a modification of this method in a patient diagnosed with inverted papilloma for which he had undergone two previous operations. This method provides complete access to the maxillary sinus, particularly the anterior wall, to provide adequate reach and ensure complete removal of tumours. We describe a technique modifying the existing transseptal approach used as an adjunct to prelacrimal recess approach, wherein a hemitransfixation incision placed in the contralateral nasal cavity along the septum provides access to the maxillary sinus with angled instruments. This modified transseptal approach provided better reach and access to the maxillary sinus. Postoperatively, there was no evidence of septal scarring or perforation and no evidence of lesion recurrence. Our technique is an easy modification to the transseptal approach that is a useful tool to access hidden areas of the maxillary sinus without associated morbidity.