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Ofentse Nobela, Ryan S Renslow, Dennis G Thomas, Sean M Colby, Sanyasi Sitha, Patrick Berka Njobeh, Louis du Preez, Fidele Tugizimana, Ntakadzeni Edwin Madala
Plants from the Asteraceae family are known to contain a wide spectrum of phytochemicals with various nutraceutical properties. One important phytochemical, chicoric acid (CA), is reported to exist in plants, such as Sonchus oleraceus and Bidens pilosa, as stereoisomers. These CA molecules occur either as the naturally abundant RR-chicoric acid (RR-CA), or the less abundant RS-chicoric acid (RS-CA), also known as meso-chicoric acid. To date, little is known about the biological activity of RS-CA, but there is evidence of its anti-human immunodeficiency virus (HIV) properties...
November 2, 2018: Journal of Photochemistry and Photobiology. B, Biology
Tracie A Seimon, Brian D Horne, Ania Tomaszewicz, Mathieu Pruvot, Sitha Som, Samat In, Chea Sokha, Steve Platt, Patricia Toledo, Denise McAloose, Paul P Calle
Southern River terrapins ( Batagur affinis) are among the most critically endangered turtles in the world. To augment the Cambodia population, a head-start program was established for the endemic subspecies Batagur affinis edwardmolli in 2006, and in 2015, prerelease health assessments were performed on 70 subadults (hatch years, 2006-2011). Combined choanal/cloacal swab samples ( n = 70) were collected and screened by polymerase chain reaction (PCR) for Mycoplasma, herpesvirus, and ranavirus. Cloacal samples ( n = 50) were also collected and cultured for Salmonella sp...
December 2017: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
Emregül Işık, Belma Haliloglu, Jaap van Doorn, Hüseyin Demirbilek, Sitha A Scheltinga, Monique Losekoot, Jan M Wit
OBJECTIVE: Acid-labile subunit (ALS) deficiency (ACLSD), caused by homozygous or compound heterozygous IGFALS mutations, is associated with moderate short stature, delayed puberty, low serum IGF-I and ALS and extremely low serum IGFBP-3. Its effect on birth weight, head circumference, bone mineral density (BMD), serum IGF-II and IGFBP-2 is uncertain, as well as the phenotype of heterozygous carriers of IGFALS mutations (partial ACLSD). DESIGN: From all available members of five Turkish families, carrying three mutations in exon 2 of IGFALS (c...
June 2017: European Journal of Endocrinology
Sitha Chan, Sirima Suvarnakuta Jantama, Sunthorn Kanchanatawee, Kaemwich Jantama
An optimization process with a cheap and abundant substrate is considered one of the factors affecting the price of the production of economical 2,3-Butanediol (2,3-BD). A combination of the conventional method and response surface methodology (RSM) was applied in this study. The optimized levels of pH, aeration rate, agitation speed, and substrate concentration (maltodextrin) were investigated to determine the cost-effectiveness of fermentative 2,3-BD production by metabolically-engineered Klebsiella oxytoca KMS005...
2016: PloS One
Priya Bhasi, Zanele P Nhlabatsi, Sanyasi Sitha
Central to any reaction mechanism study, and sometimes a challenging job, is tracing a transition state in a reaction path. For the first time, electrostatic potentials (ESP) of the reactants were used as guiding tactics to predict whether there is a possibility of any transition state in a reaction surface. The main motive behind this strategy is to see whether the directionality nature of the transition state has something to do with the anisotropic natures of the ESP with their embedded directionalities...
May 14, 2016: Physical Chemistry Chemical Physics: PCCP
Zanele P Nhlabatsi, Priya Bhasi, Sanyasi Sitha
Glycine being the simplest amino acid and also having significant astrobiological implications, has meant that intensive investigations have been carried out in the past, starting from its detection in the interstellar medium (ISM) to analysis of meteorites and cometary samples and laboratory synthesis, as well as computational studies on the possible reaction paths. In this present work quantum chemical calculations have been performed to investigate the possible interstellar formation of glycine via two different paths; (1) in a two-step process via a dihydroxy carbene intermediate and (2) through a one-step concerted mechanism, starting from reactants like CH2[double bond, length as m-dash]NH, CO, CO2, H2O and H2...
July 27, 2016: Physical Chemistry Chemical Physics: PCCP
Febé E Meyer, Louise S Shuey, Sitha Naidoo, Thandekile Mamni, Dave K Berger, Alexander A Myburg, Noëlani van den Berg, Sanushka Naidoo
Damage caused by Phytophthora cinnamomi Rands remains an important concern on forest tree species. The pathogen causes root and collar rot, stem cankers, and dieback of various economically important Eucalyptus spp. In South Africa, susceptible cold tolerant Eucalyptus plantations have been affected by various Phytophthora spp. with P. cinnamomi considered one of the most virulent. The molecular basis of this compatible interaction is poorly understood. In this study, susceptible Eucalyptus nitens plants were stem inoculated with P...
2016: Frontiers in Plant Science
Zanele P Nhlabatsi, Priya Bhasi, Sanyasi Sitha
"How the fundamental life elements are created in the interstellar medium (ISM)?" is one of the intriguing questions related to the genesis of life. Using computational calculations, we have discussed the reaction of CH2=NH, CO and H2O for the formation of glycine, the simplest life element. This reaction proceeds through a concerted mechanism with reasonably large barriers for the cases with one and two water molecules as reactants. For the two water case we found that the extra water molecule exhibits some catalytic role through the hydrogen transport relay effect and the barrier height is reduced substantially compared to the case with one water molecule...
January 7, 2016: Physical Chemistry Chemical Physics: PCCP
Priya Bhasi, Zanele P Nhlabatsi, Sanyasi Sitha
Using computational calculations the potential energy surface (PES) of the reaction between NH and NS has been analysed. The PES of the reaction shows the formation of two very stable species, HNSN and HNNS. Out of these two, HNNS which has the signature N-N linkage was found to be the most stable species in the PES. In view of the highly exothermic nature of the reaction surface, it has been proposed that these two species can possibly be detected in the interstellar space. For the first time it has also been shown that the reaction between the NH and NS can lead to the possible formation of N2via the isomer HNNS, and how the effect of tunnelling can make this reaction very much feasible, even under the extremely low temperature conditions prevailing in the interstellar medium...
December 28, 2015: Physical Chemistry Chemical Physics: PCCP
Vijay M Miriyala, Sanyasi Sitha, Paul A Steenkamp, Ntakadzeni E Madala
RATIONALE: Metabolomics is a qualitative and quantitative measurement of the metabolite content of any biological system under a given physiological status. Due to the chemically diverse nature of these samples, metabolite identification is a difficult task, and development of alternative approaches, such as those based on mass spectrometry (MS), aimed at proper metabolite identification is required. METHODS: Compliance constants, a direct measure of mechanical bond strength, were used for the first time to predict the MS fragmentation patterns of different regional isomers of a ubiquitous plant metabolite, caffeoylquinic acid (CQA)...
October 30, 2015: Rapid Communications in Mass Spectrometry: RCM
Kaemwich Jantama, Pattharasedthi Polyiam, Panwana Khunnonkwao, Sitha Chan, Maytawadee Sangproo, Kirin Khor, Sirima Suvarnakuta Jantama, Sunthorn Kanchanatawee
Klebsiella oxytoca KMS005 (∆adhE∆ackA-pta∆ldhA) was metabolically engineered to improve 2,3-butanediol (BDO) yield. Elimination of alcohol dehydrogenase E (adhE), acetate kinase A-phosphotransacetylase (ackA-pta), and lactate dehydrogenase A (ldhA) enzymes allowed BDO production as a primary pathway for NADH re-oxidation, and significantly reduced by-products. KMS005 was screened for the efficient glucose utilization by metabolic evolution. KMS005-73T improved BDO production at a concentration of 23.5±0...
July 2015: Metabolic Engineering
Mohammad A Hussain, Ashok K Sitha, Subhashisa Swain, Shridhar Kadam, Sanghamitra Pati
BACKGROUND: Lymphatic filariasis is targeted for elimination in India through mass drug administration (MDA) with diethylcarbamazine (DEC) combined with albendazole (ABZ). For the strategy to be effective, >65% of those living in endemic areas must be covered by and compliant to MDA. Post the MDA 2011 campaign in the endemic district of Odisha, we conducted a survey to assess: (i) the filariasis knowledge in the community, (ii) the coverage and compliance of MDA from the community perspective, and (iii) factors affecting compliance, as well as the operational issues involved in carrying out MDA activities from the drug distributor's perspective...
2014: Infectious Diseases of Poverty
Sarina G Kant, Sander J Broekman, Caroline C de Wit, Marloes Bos, Sitha A Scheltinga, Egbert Bakker, Wilma Oostdijk, Hetty J van der Kamp, Erik W van Zwet, Annemieke H van der Hout, Jan M Wit, Monique Losekoot
Context. Leri-Weill dyschondrosteosis is a clinically variable skeletal dysplasia, caused by SHOX deletion or mutations, or a deletion of enhancer sequences in the 3'-flanking region. Recently, a 47.5 kb recurrent PAR1 deletion downstream of SHOX was reported, but its frequency and clinical importance are still unknown. Objective. This study aims to compare the clinical features of different sizes of deletions in the 3'-flanking SHOX region in order to determine the relevance of the regulatory sequences in this region...
2013: PeerJ
Sitha Piyawinijwong, Nopamas Khampremsri, Mathee Ongsiriporn, Jantima Roongruangchai
The authors report two anatomic cases of median nerve entrapment, which can be one of the causes of carpal tunnel syndrome. Both cases were soft tissue thickening on the distal arm. The first case was the thickening of brachial fascia that resembles the Struther's ligament. The second case was the thickening of the bicipital aponeurosis combined with the supernumerary biceps brachii. Both cases demonstrated the possible cause of median nerve entrapment at the arm, which mimicked the carpal tunnel syndrome that normally occurs at the wrist...
November 2011: Journal of the Medical Association of Thailand
Sitha Chan, Sunthorn Kanchanatawee, Kaemwich Jantama
Sucrose-utilizing genes (cscKB and cscA) from Escherichia coli KO11 were cloned and expressed in a metabolically engineered E. coli KJ122 to enhance succinate production from sucrose. KJ122 harboring a recombinant plasmid, pKJSUC, was screened for the efficient sucrose utilization by growth-based selection and adaptation. KJ122-pKJSUC-24T efficiently utilized sucrose in a low-cost medium to produce high succinate concentration with less accumulation of by-products. Succinate concentrations of 51 g/L (productivity equal to 1...
January 2012: Bioresource Technology
Zuojun Guo, Meghan Gibson, Sanyasi Sitha, Steven Chu, Udayan Mohanty
The fidelity of translation selection begins with the base pairing of codon-anticodon complex between the m-RNA and tRNAs. Binding of cognate and near-cognate tRNAs induces 30S subunit of the ribosome to wrap around the ternary complex, EF-Tu(GTP)aa-tRNA. We have proposed that large thermal fluctuations play a crucial role in the selection process. To test this conjecture, we have developed a theoretical technique to determine the probability that the ternary complex, as a result of large thermal fluctuations, forms contacts leading to stabilization of the GTPase activated state...
March 8, 2011: Proceedings of the National Academy of Sciences of the United States of America
Sitha Piyawinijwong, Nopparatn Sirisathira
OBJECTIVE: To demonstrate and classify the variation of the subclavius muscle according to its insertion in the Thais. MATERIAL AND METHOD: One hundred and twenty eight upper limbs were dissected out to expose the scapular region. The attachments of subclavius muscles were examined and recorded. RESULTS: The subclavius muscle was categorized into 4 types according to its insertion. There are 64.06% of type I, 17.96% of type II, 15.62% of type III and 2...
September 2010: Journal of the Medical Association of Thailand
Sirinush Sricharoenvej, Surasak Boonprasop, Passara Lanlua, Sitha Piyawinijwong, Apichaya Niyomchan
It has been known that diabetes mellitus is associated with hyperfunction of the adrenal gland. However, the structural changes of adrenal gland in diabetes have rarely been studied. The aims of this study were to investigate the morphological and microvascular alterations in streptozotocin (STZ)-induced long-term diabetic rats. Twelve male Sprague-Dawley rats were divided into diabetic (n=8) and control (n=4) groups. Each diabetic rat was induced by an intraperitoneal injection of STZ (60 mg/kg) in citrate buffer (pH 4...
January 2009: Italian Journal of Anatomy and Embryology
Sirinush Sricharoenvej, Yutthapong Tongpob, Passara Lanlua, Sitha Piyawinijwong, Jantima Roongruangchai, Ittipon Phoungpetchara
OBJECTIVE: To investigate the renal microvascular changes in streptozotocin (STZ)-induced, long-termed diabetic rat. MATERIAL AND METHOD: Twelve male Sprague-Dawley rats were used. Each diabetic rat (n = 8) was induced by an intraperitoneal injection of STZ (60 mg/kg) in citrate buffer (pH 4.5). Control rats (n = 4) were injected intraperitoneally with the same amount of the buffer. The animals were sacrificed at 20 weeks after the injections. The kidneys were processed for conventional light microscopy (LM) and vascular corrosion cast technique with scanning electron microscopy (SEM)...
December 2007: Journal of the Medical Association of Thailand
A Spasic, S Sitha, M Korchak, S Chu, U Mohanty
The torque acting on cognate (three base pairs that are matched) "ternary complex" consisting of elongation factor-Tu, guanosine-5'-triphosphate GTP, and aminoacyl-transfer RNA due to induced wrapping of the 30S subunit of the ribosome and the speed with which the ternary complex samples the space allowed by diffusion is determined. Under appropriate conditions, mode coupling speeds up the barrier crossing rate for cognate relative to near-cognate ternary complexes. We determine the flexibility of the ternary complex relative to transfer RNA (tRNA) by a coarse-grained model...
April 10, 2008: Journal of Physical Chemistry. B
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