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Cristiane Reinaldo Lisboa,Luciana de Simoni Martinez,Renata Aguirre Trindade,Fátima Aparecida de Almeida Costa,Janaína Fernandes de Medeiros Burkert,Carlos André Veiga Burkert 한국식품과학회 2012 Food Science and Biotechnology Vol.21 No.6
In this study, a strategy was proposed for making galacto-oligossaccharides (GOS), a high valueadded product, from a byproduct of the dairy industry,cheese whey, using a commercial β-galactosidase from Kluyveromyces lactis (Lactozym® 3000L). The effects of the substrate concentration, temperature, and enzyme dosage were statistically studied and their optimum combinations were determined using response surface methodology. The increase in lactose concentration, temperature, and enzyme concentration favored a transgalactosylation reaction. The maximum values for GOS concentration (119.8 mg/mL)and yield (29.9%) in a 4 h process were obtained in the reaction system, composed of 400 mg/mL of lactose and 10 U/mL of enzyme at 40°C. Under these conditions, the lactose conversion was 68.7%. The maximum value for lactose conversion (87.8%) was observed at the same temperature and enzyme concentration, although the lactose level was 20%.
Mariano Michelon,Thais de Matos de Borba,Ruan da Silva Rafael,Carlos André Veiga Burkert,Janaína Fernandes de Medeiros Burkert 한국식품과학회 2012 Food Science and Biotechnology Vol.21 No.1
The yeast Phaffia rhodozyma is known for producing carotenogenic pigments, commonly used in aquaculture feed formulation as well as in cosmetic,pharmaceutical, and food industries. Despite the high production of carotenoids from microorganisms by biotechnology, their use has limitation due to the cell wall resistance, which constitutes a barrier to the bioavailability of carotenoids. Therefore, there is a need to improve carotenoids recovering technique from microorganisms for the application of food industries. This study aimed to compare mechanical, chemical, and enzymatic techniques of cell disruption for extracting carotenoids produced by P. rhodozyma NRRL Y-17268. Among the techniques studied, the highest specific concentration of carotenoids (190.35 μg/g) resulted from the combined techniques of frozen biomass maceration using diatomaceous earth and enzymatic lysis at pH of the reaction medium of 4.5 at 55oC, with initial activity of β-1,3 glucanase of 0.6 U/mL for 30 min.
Jana, Milan,Sivakumar, Periyasamy,Kota, Manikantan,Jung, Min Gyu,Park, Ho Seok Elsevier 2019 Journal of Power Sources Vol.422 No.-
<P><B>Abstract</B></P> <P>A facile and selective hydrothermal synthesis is performed to control the crystalline phases of cobalt hydroxides into α-Co(OH)<SUB>2</SUB> and β-Co(OH)<SUB>2</SUB>: α-Co(OH)<SUB>2</SUB>, consisting of both octahedral and tetrahedral Co sites, is produced without ionic liquids, whereas β-Co(OH)<SUB>2</SUB>, containing octahedral Co sites, is synthesized in the presence of ionic liquids. The ionic liquids play significant role as co-solvent and template to tune the morphology of Co(OH)<SUB>2</SUB>. α-Co(OH)<SUB>2</SUB> reveals flake-like structure, whereas β-Co(OH)<SUB>2</SUB> exhibits nanorod-like network structure. The interlayer spacing of α-Co(OH)<SUB>2</SUB> is 8.24 Å, which is larger than 4.63 Å of β-Co(OH)<SUB>2</SUB> due to the expansion of interlayer by the precursor Cl<SUP>─</SUP> anions. The presence of Cl<SUP>─</SUP> anions hinders the insertion of hydroxide ion into α-Co(OH)<SUB>2</SUB> interlayers, which shows the specific capacitance of 613 F g<SUP>─1</SUP> less than 1066 F g<SUP>─1</SUP> of β-Co(OH)<SUB>2</SUB> at 2 A g<SUP>─1</SUP>. When the current density increases up to 20 A g<SUP>─1</SUP>, the capacitance retention of β-Co(OH)<SUB>2</SUB> is 80%, greater than 70% of α-Co(OH)<SUB>2</SUB>. Configuring β-Co(OH)<SUB>2</SUB> and reduced graphene oxide as positive and negative electrodes, asymmetric supercapacitor delivers the maximum energy and power densities of 20.05 W h kg<SUP>─1</SUP> and 13.40 kW kg<SUP>─1</SUP> with the capacitance retention of 93% over 10,000 cycles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Crystalline phases and interlayer distance of Co(OH)<SUB>2</SUB> are controlled. </LI> <LI> α- and β-Co(OH)<SUB>2</SUB> reveal flake-like and nanorod-like structures. </LI> <LI> β-Co(OH)<SUB>2</SUB> shows 1066 F g<SUP>−1</SUP> at 2 A g<SUP>−1</SUP>. </LI> <LI> β-Co(OH)<SUB>2</SUB> reveals 80% of its initial capacitance at 20 A g<SUP>−1</SUP>. </LI> <LI> Asymmetric supercapacitor achieves 20.05 W h kg<SUP>−1</SUP> and 10,000 cycle stability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Jana, Atanu,Ishida, Masatoshi,Cho, Kevin,Ghosh, Sudip Kumar,Kwak, Kyuju,Ohkubo, Kei,Sung, Young Mo,Davis, Christina M.,Lynch, Vincent M.,Lee, Dongil,Fukuzumi, Shunichi,Kim, Dongho,Sessler, Jonathan L. The Royal Society of Chemistry 2013 Chemical communications Vol.49 No.79
<P>Tetrathiafulvalenes (TTF)-annulated [28]hexaphyrin affords an electron rich flexible π-conjugated system whose limiting conformations can be controlled through choice of solvents. The conformation-dependent intramolecular charge transfer character, as well as electron reserve capability of the hexakis-TTF annulated hexaphyrin, was analyzed.</P> <P>Graphic Abstract</P><P>A flexible π-electron conjugated macrocycle (hexaphyrin) core with six redox active TTF fragments has been developed. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cc44934c'> </P>
Jana Ekhvaia,Arsena Bakhia,Zezva Asanidze,Tornike Beltadze,Otar Abdaladze 강원대학교 산림과학연구소 2022 Journal of Forest Science Vol.38 No.2
Leaf functional traits widely have been used to understand the environmental controls of resource utilization strategy of plants along the environmental gradients. By using key leaf functional traits, we quantified the relationships between leaf traits and local climate throughout the distributional range of Rhododendron caucasicum Pall. in eastern and western Georgian mountains (the South Caucasus). Our results revealed, that all traits showed high levels of intraspecific variability across study locations and confirmed a strong phenotypic differentiation of leaf functional variation along the east-west longitudinal gradient in response to the local climate; out of the explored climatic variables, the moisture factors related to precipitation and number of precipitation and dry days for winter and growth seasons were more strongly related to leaf trait variation than the elevation and air temperature. Among studied leaf traits, the leaf specific area (SLA) showed the highest level of variability indicating the different resource utilization strategies of eastern and western-central Rh. caucasicum individuals. High SLA leaves for western-central Caucasian individuals work in relatively resource-rich environments (more humid in terms of precipitation amount and the number of precipitation days in winter) and could be explained by preferential allocation to photosynthesis and growth, while eastern Caucasian samples work in resource-poor environments (less humid in terms of precipitation amount and the number of precipitation days in winter) and the retention of captured resources is a higher priority appearing in a low SLA leaves. However, more evidence from a broader study of the species throughout its distribution range by including additional environmental factors and molecular markers are needed for firmer conclusions of intraspecific variability of Rh. caucasicum.
Jana, Ranjan Kumar,Pal, Ankit,Shukla, Ajay Kumar Korean Mathematical Society 2021 대한수학회논문집 Vol.36 No.1
This paper devoted to obtain some fractional integral properties of generalized Bessel function using pathway fractional integral operator. We also find the pathway transform of the generalized Bessel function in terms of Fox H-function.
Treatment of Symptomatic Focal Hepatic Hemangioma with Propranolol in Neonates: Is It Efficient?
Jana Lozar Krivec,Nina Lah,Mojca Glušič,Orjana Velikonja,Darja Paro-Panjan 대한소아소화기영양학회 2023 Pediatric gastroenterology, hepatology & nutrition Vol.26 No.1
Hepatic hemangiomas (HH) – classified into congenital hepatic hemangiomas (CHH) or infantile hepatic hemangiomas (IHH) – are benign vascular tumors that are mainly asymptomatic, but may cause clinical problems that require treatment. While focal, multifocal, and diffuse IHH are responsive to propranolol treatment, CHH is mainly focal and thought to be resistant to treatment with propranolol. The clinical and imaging distinctions between CHH and IHH in cases of focal lesions can be challenging, while histopathological distinction is mostly lacking in the clinical setting. We report 4 neonatal symptomatic cases of focal HH treated with propranolol, with partial or complete resolution of the tumor, and the positive hemodynamic effect of propranolol in one case. We believe that although clear differentiation cannot be achieved between CHH and IHH without histopathological examination in cases of focal HH in neonates, propranolol treatment should be attempted in symptomatic cases since its benefits outweigh the possible small risk of side effects of propranolol.
C60 embedded diamond-like nanocomposite thin film
Jana Sukhendu,Das Sayan,De Debasish,Shakti Nanda,Mondal Anup,Bhattacharya Sekhar,Gongopadhyay Utpal 한국탄소학회 2022 Carbon Letters Vol.32 No.1
Diamond-like nanocomposite (DLN) has become a promising thin film for many fields of applications due to its unique and tunable properties. However, low optical bandgap and thermal stability limits its application in many fields particularly as antireflection coating on solar cell. In the present study, the DLN thin film has been deposited using a mixed liquid precursor by rf-PECVD process. Surprisingly the presence of nc-C60 in FCC structure in DLN matrix has been observed. The degree of crystallinity and diameter of C60 have been increased significantly after annealed at 850 °C. The film has been annealed at 850 °C to primarily investigate its feasibility as antireflection coating (ARC) in compatible with industrial solar cell fabrication process. The refractive index and optical bandgap of the film were around 1.80 and 4.10 eV, respectively. Moreover, the optical bandgap has decreased to some extent to 3.92 eV even after annealing at such high temperature. The high SiOx at% and embedded nc-C60 enhanced the optical transparency and thermal stability of the DLN film. The solar-weighted average reflection of DLN-coated textured silicon was reduced significantly to 1.91%. The C60 embedded DLN film has a great potential to apply in different optoelectronic devices especially in solar cell as ARC.
Jana, Rabindranath N.,Cho, Jae Whan Wiley Subscription Services, Inc., A Wiley Company 2009 Journal of applied polymer science Vol.114 No.6
<P>Silicone-based cholesteric liquid crystalline polymers (ChLCP) were fabricated with variable clearing temperatures as controlled by their chemical compositions. The chemical structures of the mesogenic monomers and ChLCP were confirmed by FTIR and <SUP>1</SUP>H-NMR spectroscopy. The mesogenic properties and phase behavior were investigated by differential scanning calorimetry, polarizing optical microscopy, and X-ray diffraction measurements. The experimental results demonstrated that the glass transition temperatures and the clearing points of the liquid crystalline polymers decreased with increasing proportion of mesogenic crosslinking agent up to 12.50 mol % (LCP-3), and at higher proportion of crosslinking agent, the clearing points disappeared, indicating that the network chains have less chance to orient themselves. Thermogravimetric analysis showed that the LCP-3 was the most stable up to 230°C. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009</P>