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1.
The present study optimised the ultrasound-assisted extraction (UAE) of bioactive compounds from m>Amaranthus hypochondriacus m> var. Nutrisol. Influence of temperature (25.86–54.14 °C) and ultrasonic power densities (UPD) (76.01–273.99 mW/mL) on total betalains (BT), betacyanins (BC), betaxanthins (BX), total polyphenols (TP), antioxidant activity (AA), colour parameters (L*, a*, and b*), amaranthine (A), and isoamaranthine (IA) were evaluated using response surface methodology. Moreover, betalain extraction kinetics and mass transfer coefficients (KLa) were determined for each experimental condition. BT, BC, BX, TP, AA, b*, KLa, and A were significantly affected (m>p < m> 0.05) by temperature extraction and UPD, whereas L*, a*, and IA were only affected (m>p < m> 0.05) by temperature. All response models were significantly validated with regression coefficients (R2) ranging from 87.46 to 99.29%. BT, A, IA, and KLa in UAE were 1.38, 1.65, 1.50, and 29.93 times higher than determined using conventional extraction, respectively. Optimal UAE conditions were obtained at 41.80 °C and 188.84 mW/mL using the desired function methodology. Under these conditions, the experimental values for BC, BX, BT, TP, AA, L*, a*, b*, KLa, A, and IA were closely related to the predicted values, indicating the suitability of the developed quadratic models. This study proposes a simple and efficient UAE method to obtain betalains and polyphenols with high antioxidant activity, which can be used in several applications within the food industry. 相似文献
2.
Ying Xu Yufan Wang Fu-Sen Liang 《Angewandte Chemie (International ed. in English)》2023,62(43):e202309291
N6-methyladenosine (m6A) on RNAs plays an important role in regulating various biological processes and CRIPSR technology has been employed for programmable m6A editing. However, the bulky size of CRISPR protein and constitutively expressed CRISPR/RNA editing enzymes can interfere with the native function of target RNAs and cells. Herein, we reported a conditional m6A editing platform (FKBP*-dCas13b-ALK) based on a ligand stabilized dCas13 editor. The inducible expression of this m6A editing system was achieved by adding or removing the Shield-1 molecule. We further demonstrated that the targeted recruitment of dCas13b-m6A eraser fusion protein and site-specific m6A erasing were achieved under the control of Shield-1. Moreover, the release and degradation of dCas13b fusion protein occurred faster than the restoration of m6A on the target RNAs after Shield-1 removal, which provides an ideal opportunity to study the m6A function with minimal steric interference from bulky dCas13b fusion protein. 相似文献
3.
Imprinted silica nanoparticles coated with N‐propylsilylmorpholine‐4‐carboxamide for the determination of m‐cresol in synthetic and real samples 下载免费PDF全文
Manisha Ghai Priyanka Narula Varinder Kaur Raghubir Singh 《Journal of separation science》2015,38(19):3442-3449
m‐Cresol‐imprinted silica nanoparticles coated with N‐propylsilylmorpholine‐4‐carboxamide have been developed that contain specific pockets for the selective uptake of m‐cresol. Silica nanoparticles were synthesized by a sol–gel process followed by functionalization of their surface with N‐propylsilylmorpholine‐4‐carboxamide. The formation of m‐cresol‐imprinted silica nanoparticles was confirmed by UV‐Vis spectrophotometry, infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy and transmission electron microscopy. Electron microscopic studies revealed the formation of monodispersed imprinted silica nanoparticles with spherical shape and an average size of 83 nm. The developed nanoparticles were filled in a syringe and used for the extraction of m‐cresol from aqueous samples followed by quantification using high‐performance liquid chromatography with diode array detection. Various adsorption experiments showed that developed m‐cresol‐imprinted silica nanoparticles exhibited a high adsorption capacity and selectivity and offered a fast kinetics for rebinding m‐cresol. The chromatographic quantification was achieved using mobile phase consisting of acetonitrile/water (70:30 v/v) at an isocratic flow rate of 1.0 mL/min using a reversed‐phase C18 column and detection at λmax = 275 nm. The limits of detection and quantification were 1.86 and 22.32 ng/mL, respectively, for the developed method. The percent recoveries ranged from 96.66–103.33% in the spiked samples. This combination of this nanotechnique with molecular imprinting was proved as a reliable, sensitive and selective method for determining the target from synthetic and real samples. 相似文献
4.
The Nordic forest industry requires just-in-time wood deliveries. Operations must continue regardless of season, weather and terrain. Soil compaction and deep ruts must be avoided while providing high performance and a reasonable working environment for operators.The Xt28 pendulum arm forwarder is a full-size concept forwarder with six hydrostatic propelled wheels on pendulum arms built on a three-piece frame connected with two articulation joints. The Xt28 concept machine was tested according to Skogforsk standard machine tests. Rut depth test focused on soil interaction where rut depth was measured related to number of passes. Machine dynamics were measured using standardized test track with focus on operator comfort.The project proved the potential of pendulum arm technology in off-road transportation. Automatic pendulum arm levelling, equalized ground pressure between wheels and improved operator comfort through reducing adverse vibrations and roll angles, simultaneously reducing dynamic forces transferred to the forest floor. Pendulum arm technology improves travel speed in adverse terrain, providing unparalleled side slope capability and enhanced productivity. 相似文献
5.
In the paper anomalous diffusion appearing in a porous medium composed of two porous components of considerably different diffusion characteristics is examined. The differences in diffusivities are supposed to result either from two medium types being present or from variations in pore size (double porosity media). The mg src="/content/m711qw6m5un53638/xxlarge8216.gif" alt="lsquo" align="BASELINE" BORDER="0">long-tailmg src="/content/m711qw6m5un53638/xxlarge8217.gif" alt="rsquo" align="BASELINE" BORDER="0"> effect is predicted using the homogenization approach based on the application of multiple scale asymptotic developments. It is shown that, if the ratio of effective diffusion coefficients of two porous media is of the order of magnitude smaller or equal O(mg src="/content/m711qw6m5un53638/xxlarge949.gif" alt="epsi" align="BASELINE" BORDER="0">
2), wheremg src="/content/m711qw6m5un53638/xxlarge949.gif" alt="epsi" align="BASELINE" BORDER="0"> is a homogenization parameter, then the macroscopic behaviour of the composite may be affected by the presence of mg src="/content/m711qw6m5un53638/xxlarge8216.gif" alt="lsquo" align="BASELINE" BORDER="0">tail-effectmg src="/content/m711qw6m5un53638/xxlarge8217.gif" alt="rsquo" align="BASELINE" BORDER="0">. The results of the theoretical analysis were applied to a problem of diffusion in a bilaminate composite. Analytical calculations were performed to show the presence of the mg src="/content/m711qw6m5un53638/xxlarge8216.gif" alt="lsquo" align="BASELINE" BORDER="0">long-tailmg src="/content/m711qw6m5un53638/xxlarge8217.gif" alt="rsquo" align="BASELINE" BORDER="0"> effect in two particular cases.Notations
c
i
the concentration of chemical species in water within the medium mg src="/content/m711qw6m5un53638/xxlarge8216.gif" alt="lsquo" align="BASELINE" BORDER="0">img src="/content/m711qw6m5un53638/xxlarge8217.gif" alt="rsquo" align="BASELINE" BORDER="0">
-
D
i
the effective diffusion coefficient for the medium mg src="/content/m711qw6m5un53638/xxlarge8216.gif" alt="lsquo" align="BASELINE" BORDER="0">img src="/content/m711qw6m5un53638/xxlarge8217.gif" alt="rsquo" align="BASELINE" BORDER="0">
-
D
ij
eff
the macroscopic (or effective) diffusion tensor in the composite
-
ERV
the elementary representative volume
-
h
the thickness of the period
-
l
a chracteristic length of the ERV or the periodic cell
-
L
a characteristic macroscopic length
-
n
the volumetric fraction of the material 2
- 1–n
the volumetric fraction of the material 1
-
N
the unit vector normal to mg src="/content/m711qw6m5un53638/xxlarge947.gif" alt="gamma" align="MIDDLE" BORDER="0">
-
t
the time variable
-
x
the macroscopic (or slow) space variable
-
y
the microscopic (or fast) space variable
-
c
1c
,C
2c
,D
1c
,D
2c
the characteristic quantities
-
T,T
1L
,T
2L
,T
1l
,T
2l
the characteristic times
-
c
1
*
,c
2
*
,D
1
*
,D
2
*
,t
*
the non-dimensional variables
-
mg src="/content/m711qw6m5un53638/xxlarge949.gif" alt="epsi" align="BASELINE" BORDER="0">
the homogenization parameter
- mg src="/content/m711qw6m5un53638/xxlarge937.gif" alt="OHgr" align="BASELINE" BORDER="0">1
the domain occupied by the material 1
- mg src="/content/m711qw6m5un53638/xxlarge937.gif" alt="OHgr" align="BASELINE" BORDER="0">2
the domain occupied by the material 2
- mg src="/content/m711qw6m5un53638/xxlarge947.gif" alt="gamma" align="MIDDLE" BORDER="0">
the interface between the domains 1 and 2
- mg src="/content/m711qw6m5un53638/xxlarge8741.gif" alt="par" align="MIDDLE" BORDER="0">mg src="/content/m711qw6m5un53638/xxlarge937.gif" alt="OHgr" align="BASELINE" BORDER="0">mg src="/content/m711qw6m5un53638/xxlarge8741.gif" alt="par" align="MIDDLE" BORDER="0">
the total volume of the periodic cell
-
mg src="/content/m711qw6m5un53638/xxlarge8706.gif" alt="part" align="MIDDLE" BORDER="0">/mg src="/content/m711qw6m5un53638/xxlarge8706.gif" alt="part" align="MIDDLE" BORDER="0">xi
the gradient operator
- mg src="/content/m711qw6m5un53638/xxlarge8711.gif" alt="nabla" align="MIDDLE" BORDER="0">
the gradient operator 相似文献
6.
N. N. Myagkov 《Journal of Applied Mechanics and Technical Physics》2003,44(2):249-254
Nonlinear wave processes in shockmg src="/content/x5263517223m261h/xxlarge8208.gif" alt="dash" align="MIDDLE" BORDER="0">loaded elastoplastic materials are modeled. A comparison of the results obtained with experimental data and numerical solutions of exact systems of dynamic equations shows that the model equations proposed qualitatively describe the stressmg src="/content/x5263517223m261h/xxlarge8208.gif" alt="dash" align="MIDDLE" BORDER="0">distribution evolution in both the elasticmg src="/content/x5263517223m261h/xxlarge8208.gif" alt="dash" align="MIDDLE" BORDER="0">flow and plasticmg src="/content/x5263517223m261h/xxlarge8208.gif" alt="dash" align="MIDDLE" BORDER="0">flow regions and can be used to solve onemg src="/content/x5263517223m261h/xxlarge8208.gif" alt="dash" align="MIDDLE" BORDER="0"> and twomg src="/content/x5263517223m261h/xxlarge8208.gif" alt="dash" align="MIDDLE" BORDER="0">dimensional problems of pulsed deformation and fracture of elastoplastic media. 相似文献
7.
Characterizations of ( m,n )-Jordan Derivations and ( m,n )-Jordan Derivable Mappings on Some Algebras 下载免费PDF全文
Let R be a ring, M be a R-bimodule and m, n be two fixed nonnegative integers with m + n = 0. An additive mapping δ from R into M is called an(m, n)-Jordan derivation if(m +n)δ(A~2) = 2 mAδ(A) + 2nδ(A)A for every A in R. In this paper, we prove that every(m, n)-Jordan derivation with m = n from a C*-algebra into its Banach bimodule is zero. An additive mappingδ from R into M is called a(m, n)-Jordan derivable mapping at W in R if(m + n)δ(AB + BA) =2mδ(A)B + 2 mδ(B)A + 2 nAδ(B) + 2 nBδ(A) for each A and B in R with AB = BA = W. We prove that if M is a unital A-bimodule with a left(right) separating set generated algebraically by all idempotents in A, then every(m, n)-Jordan derivable mapping at zero from A into M is identical with zero. We also show that if A and B are two unital algebras, M is a faithful unital(A, B)-bimodule and U = [A M N B] is a generalized matrix algebra, then every(m, n)-Jordan derivable mapping at zero from U into itself is equal to zero. 相似文献
8.
Giovanni Papandrea 《合成通讯》2013,43(6):858-865
This article describes a new route to peptidosulfonamide. Our study shows how sulfinamides were first obtained via nucleophilic cleavage of 3,6‐dihydrothiazine‐1‐oxide system and how the products can be subjected to oxidation with m‐chloroperbenzoic acid to give sulfonamides in good yield. 相似文献
9.
Using chemical separations and radiometric measurements medium-half-life irradiation products of molybdenum with 12.5 MeV deuterons were determined (90Nb, 92Nb, 95mNb, 95Nb, 96Nb, 99Mo, 95mTc, 96Tc, 99mTc) as well as thick target yields for some of them: 92Nb (0.22 μCi/μAh), 95Nb(0.05 μCi/μAh), 99Mo (64 μCi/μAh), 95mTc(0.76 μCi/μAh), 96Tc((62.5 μCi/μAh). Moreover isolation possibiities of radioactive preparations from removed worn-cut molybdenum parts of the U-120 cycletron are discussed. 相似文献
10.
J. E. Komosiński 《Isotopes in environmental and health studies》2013,49(5):199-201
Studies on the workability of precise seeders by means of labelling methods has been possible due to the solution of the following problems: labelling of seeds, radiation collimation of labelled seeds being sown, elaboration of measuring and registering systems as well as processing systems of a measuring signal. The developed method allows for precise, quick and fully objective evaluation of the studied seeders to be done under natural conditions. 相似文献