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C34H44FeN10O4Se2, monoclinic, C2/c (no. 15), a = 26.6523(15) Å, b = 7.6259(3) Å, c = 21.3645(11) Å, β = 117.888(7)°, V = 3838.0(4) Å3, Z = 4, R gt(F) = 0.0336, wR ref(F 2) = 0.0748, T = 293 K.

C13H18N2O4S, orthorhombic, P212121 (no. 19), a = 6.8690(1) Å, b = 12.0694(2) Å, c = 16.6748(3) Å, V = 1382.42(4) Å3, Z = 4, R gt(F) = 0.0278, wR ref(F 2) = 0.0729, T = 150 K.

C37H53FO3, orthorhombic, P212121 (no. 19), a = 7.4716(8) Å, b = 15.0009(15) Å, c = 28.065(5) Å, V = 3145.5(7) Å3, Z = 4, Rgt(F) = 0.0643, wRref(F2) = 0.1464, T = 293 K.

C37H52O3, orthorhombic, P212121 (no. 19), a = 8.2477(3) Å, b = 19.2976(7) Å, c = 19.6372(4) Å, V = 3125.47(17) Å3, Z = 4, R gt(F) = 0.0558, wR ref(F 2) = 0.1728, T = 293 K.

C18H15FN4O, triclinic, P 1‾ $\overline{1}$ (no. 2), a = 8.8914(5) Å, b = 10.5705(7) Å, c = 16.4831(9) Å, α = 96.673(5)°, β = 99.397(5)°, γ = 95.062(5)°, V = 1508.93(16) Å3, Z = 4, Rgt (F) = 0.0477, wRref (F 2) = 0.1232, T = 293 K.

C10H10O2, monoclinic, C2/c (no. 15), a = 16.6341(14) Å, b = 7.4319(4) Å, c = 14.8943(10) Å, β = 123.243(8)°, V = 1540.0(2) Å3, Z = 8, Rgt(F) = 0.0371, wRref(F2) = 0.0997, T = 293 K.

C36H52FNO3, orthorhombic, P212121 (no. 19), a = 7.8101(5) Å, b = 13.1592(7) Å, c = 30.5721(15) Å, V = 3142.0(3) Å3, Z = 4, R gt(F) = 0.0488, wR ref(F 2) = 0.1048, T = 293 K.

C20H18ClF4N3O, orthorhombic, Pbca (no. 61), a = 12.5254(4) Å, b = 12.6845(5) Å, c = 24.1490(11) Å, V = 3836.8(3) Å3, Z = 8, Rgt(F) = 0.0485, wRref(F2) = 0.1343, T = 293 K.

C19H16F4O3, monoclinic, P21/n (no. 14), a = 9.5792(5) Å, b = 9.5542(4) Å, c = 17.6986(9) Å, β = 99.508(5)∘, V = 1597.55(14) Å3, Z = 4, R gt(F) = 0.0481, wR ref(F 2) = 0.1153, T = 293 K.

C20H18ClF4N3O, monoclinic, P21/c (no. 14), a = 9.6123(7) Å, b = 11.8692(7) Å, c = 16.9510(12) Å, β = 104.798(7)∘, V = 1869.8(2) Å3, Z = 4, Rgt(F) = 0.0444, wRref(F2) = 0.1043, T = 293 K.

C17H12F2O, triclinic, P1¯ (no. 2), a = 7.9570(14) Å, b = 8.9872(19) Å, c = 9.3974(16) Å, α = 94.467(16)°, β = 96.737(14)°, γ = 103.162(16)°, V = 646.0(2) Å3, Z = 2, R gt(F) = 0.0417, wR ref(F 2) = 0.1112, T = 293 K.

C13H18N2O4S, orthorhombic, P212121 (no. 19), a = 6.8619(2) Å, b = 12.0735(4) Å, c = 16.6591(5) Å, V = 1380.16(7) Å3, Z = 4, R gt(F) = 0.0236, wR ref(F 2) = 0.0604, T = 150 K.

C20H17F3O3, monoclinic, P21/c (no. 14), a = 9.0684(4) Å, b = 13.1942(6) Å, c = 13.7883(7) Å, β = 96.250(5)°, V = 1639.97(13) Å3, Z = 4, R gt(F) = 0.0415, wR ref(F 2) = 0.1125, T = 100 K.

C21H20FNO2 ${\mathrm{C}}_{21}{\mathrm{H}}_{20}\mathrm{F}\mathrm{N}{\mathrm{O}}_{2}$ , triclinic, P1̄ (no. 2), a = 9.2201(7) Å, b = 9.3195(8) Å, c = 11.4012(9) Å, α = 103.880(7)° $103.880(7){}^{\circ}$ , β = 100.987(7)° $100.987(7){}^{\circ}$ , γ = 115.090(7)° $115.090(7){}^{\circ}$ , V = 1796.31(20) Å3 ${\mathrm{\mathring{\text{A}}}}^{3}$ , Z = 2, Rgt ${R}_{gt}$ (F) = 0.0421, wRref $w{R}_{ref}$ (F2 ${\mathrm{F}}^{2}$ ) = 0.1136, T = 293 K.

C18H12F4O, triclinic, P1̄ (no. 2), a = 7.9400(8) Å, b = 8.1071(9) Å, c = 13.3238(15) Å, α = 89.394(9)° $89.394\left(9\right)^{\circ} $ , β = 76.343(9)° $76.343\left(9\right)^{\circ} $ , γ $$ =63.411(11)° $\text{63.411}\left(11\right)^{\circ} $ , V = 740.79(15) Å3, Z = 2, Rgt ${R}_{\mathit{g}\mathit{t}}$ (F) = 0.0472, wRref $w{R}_{\mathit{r}\mathit{e}\mathit{f}}$ (F 2) = 0.1244, T = 293 K.

C19H14F4O2, triclinic, P1‾$P\overline{1}$ (no. 2), a = 8.3798(6) Å, b = 9.2019(7) Å, c = 10.4504(7) Å, α = 77.941(6)°, β = 85.712(6) , γ = 79.078(6)°, V = 773.25(10) Å3, Z = 2, Rgt(F) = 0.0458, wRref(F2) = 0.1165, T = 100 K.

C17H12F2O1, monoclinic, P1‾$P\overline{1}$ (no. 2), a = 7.3832(8) Å, b = 8.6467(9) Å, c = 11.3278(11) Å, α = 87.633(8)°, β = 88.022(8)°, γ = 65.364(10)°, V = 654.88(13) Å3, Z = 2, Rgt(F) = 0.0369, wRref(F2) = 0.0987, T = 293(2) K.

C17H15NO3, monoclinic, P21/n (no. 14), a = 4.3970(3) Å, b = 13.8942(8) Å, c = 22.0484(14) Å, β = 91.099(6)°, V = 1346.75(15), Z = 4, Rgt (F) = 0.0412, wRref (F2) = 0.1003, T = 150 K.

C18H17NO3, triclinic, P1‾$P\overline{1}$ (no. 2), a = 7.4638(8) Å, b = 8.0392(8) Å, c = 12.6767(11) Å, α = 108.187(8)°, β = 94.029(7)°, γ = 95.071(8)°, V = 715.95(13) Å3, Z = 2, Rgt (F) = 0.0573, wRref(F2) = 0.1460, T = 100.0(2) K.

C17H14FNO2, monoclinic, C2/c (no. 15), a = 15.5754(12) Å, b = 7.4828(6) Å, c = 23.0981(18) Å, β = 90.797(7)°, V = 2691.8(4) Å3, Z = 8, Rgt(F) = 0.0442, wRref(F2) = 0.1096, T = 100(1)° K.

C19H14F4O2, monoclinic, P21/c (no. 14), a = 11.8614(10) Å, b = 7.9148(6) Å, c = 16.7999(16) Å, β = 99.150(9)°, V = 1557.1(2) Å3, Z = 4, R gt(F) = 0.0446, wR ref(F 2) = 0.1150, T = 100 K.

C30H48O5, orthorhombic, P212121 (no. 19), a = 11.6608(10) Å, b = 14.8098(15) Å, c = 15.9975(16) Å, V = 2762.7(5) Å3, Z = 4, Rgt(F) = 0.0586, wRref (F2) = 0.1580, T = 293(2) K.

C30H48O4, orthorhombic, P212121 (no. 19), a = 12.34133(14) Å, b = 16.50759(15) Å, c = 26.8804(2) Å, V = 5476.23(9) Å3, Z = 8, Rgt(F) = 0.0422, wRref(F2) = 0.0990, T = 293 K.

C30H46O3·1/6H2O, monoclinic, C2 (no. 5), a = 29.4307(4) Å, b = 15.42797(17) Å, c = 18.4667(2) Å, β = 104.4652(12)°, V = 8119.11(17) Å3, Z = 12, Rgt(F) = 0.0432, wRref(F2) = 0.1197, T = 293(2) K.

C32H54O4, monoclinic, P21 (no. 4), a = 7.8727(1) Å, b = 19.9173(2) Å, c = 19.1801(2) Å, β = 94.539(1)°, V = 2998.06(6) Å3, Z = 4, Rgt(F) = 0.0370, wRref(F2) = 0.0983, T = 293 K.

BACKGROUND The crystal structure of natural gas hydrate mainly depends on the species and composition of guest molecules. At present, the structure and spectral characteristics of single-component hydrate are relatively clear, but the studies of multi-component hydrates are relatively scarce. OBJECTIVES To solve the problem of structure identification of multi-component hydrate, and understand its spectral characteristics. METHODS Methane-propane (CH4-C3H8) and methane-tetrahydrofuran (CH4-THF) binary hydrates, as well as CH4, C3H8 and THF (molar ratio 1:17) single-component hydrate samples were synthesized and characterized by low-temperature X-ray powder diffraction (PXRD) and Raman spectroscopy. RESULTS Both of the binary hydrates were typical structure Ⅱ hydrates, which were the same as those of C3H8 and THF hydrate. The crystal cell parameters a for CH4-C3H8 and CH4-THF binary hydrates were 17.2312×10-10 m and 17.2241×10-10 m, respectively. For CH4-C3H8 hydrate, CH4 was distributed in both large and small cages, showing two characteristic Raman peaks (2900cm-1 and 2911cm-1); C3H8 was only distributed in the large cage. Compared with C3H8 hydrate, the C-H stretching vibration peak was almost unchanged while the C-C stretching vibration peak (873cm-1) shifted by 3cm-1 to low frequency. For CH4-THF hydrate, the large cage was occupied by THF and CH4 was only filled in the small cage (2910cm-1). The peak positions of C-C and C-H stretching vibrations of THF in CH4-THF hydrate were consistent with those of THF hydrate. CONCLUSIONS The structure types of binary hydrates are consistent with those of single component hydrates. Molecules with larger sizes play a key role in the crystal structure of binary hydrates containing CH4. Moreover, the distribution of CH4 molecules in the cages are also influenced by larger molecules, and the Raman spectral characteristics of binary hydrates are significantly different. The conclusion of this study has important guiding significance for identifying the microstructure of multi-component hydrate based on spectral characteristics.

C17H14FNO2, monoclinic, P21/c (no. 14), a = 14.0279(13) Å, b = 7.0527(5) Å, c = 14.4150(16) Å, β = 113.165(12)°, V = 1311.2(2) Å3, Z = 4, Rgt(F) = 0.0524, wRref(F2) = 0.1358, T = 100 K.

C18H17NO3, triclinic, P1‾$P‾{1}$ (no. 2), a = 7.3950(5) Å, b = 8.6697(5) Å, c = 11.6813(9) Å, α = 85.457(6)°, β = 76.712(6)°, γ = 82.759(5)°, V = 722.07(9) Å3, Z = 2, Rgt(F) = 0.0502, wRref(F2) = 0.1342, T = 99.9(3) K.

C24H21F6NO3, monoclinic, P21/c (no. 14), a = 16.6493(9) Å, b = 15.3005(8) Å, c = 8.8554(5) Å, β = 99.746(6)°, V = 2223.3(2) Å3, Z = 4, Rgt(F) = 0.0444, wRref(F2) = 0.1094, T = 100 K.

C34H56O6⋅0.25(C4H8O2), orthorhombic, P212121 (no. 19), a = 8.17152(14) Å, b = 17.6728(3) Å, c = 23.1916(5) Å, V = 3349.18(11) Å3, Z = 4, Rgt(F) = 0.0416, wRref(F2) = 0.1143, T = 293 K.

C20H14F6O2${\text{C}}_{20}{\text{H}}_{14}{\text{F}}_{6}{\text{O}}_{2}$, monoclinic, P21/c (no. 14), a = 14.791(2) Å, b = 8.5303(9) Å, c = 15.531(3) Å, β = 115.474(19)°, V = 1769.1(5) Å3, Z = 4, Rgt${R}_{gt}$(F) = 0.0574, w Rref$w\,{R}_{\text{ref}}$(F2) = 0.1451, T = 100 K.

C19H14F4O2, monoclinic, C2/c (no. 15), a = 17.1519(13) Å, b = 13.9810(8) Å, c = 15.2299(9) Å, β = 123.031(7)°, V = 3061.9(4) Å3, Z = 8, Rgt(F) = 0.0410, wRref(F2) = 0.1010, T = 100(1) K.

C19H14F4O2${\text{C}}_{19}{\text{H}}_{14}{\text{F}}_{4}{\text{O}}_{2}$, triclinic, P1‾$P‾{1}$ (no. 2), a = 8.1539(7) Å, b = 8.8584(6) Å, c = 11.8025(9) Å, α = 73.186(7)°, β = 76.184(7)°, γ = 69.512(7)°, V = 755.39(11) Å3, Z = 2, Rgt${R}_{gt}$(F) = 0.0436, wRref$w{R}_{\text{ref}}$(F2) = 0.0965, T = 100 K.

C39H54O5, monoclinic, P21 (no. 4), a = 6.98138(17) Å, b = 37.9050(6) Å, c = 7.28644(16) Å, β = 117.789(3)°, V = 1705.82(8) Å3, Z = 2, Rgt (F) = 0.0326, wRref(F2) = 0.0872, T = 293(2) K.

C32H52O5, monoclinic, P21 (no. 4), a = 11.816(2) Å, b = 7.4064(15) Å, c = 17.101(3) Å, β = 97.01(3)°, V = 1485.5(5) Å3, Z = 2, Rgt(F) = 0.0543, wRref(F2) = 0.1501, T = 293(2) K.

C31H48O5, monoclinic, P21 (no. 4), a = 11.0421(3) Å, b = 6.49710(16) Å, c = 20.4687(4) Å, β = 97.922(2)°, V = 1454.45(6) Å3, Z = 2, Rgt(F) = 0.0382, wRref(F2) = 0.1024, T = 293(2) K.

C26H20Cl2F3NO3S, triclinic, P1̄ (no. 2), a = 8.5616(4) Å, b = 11.6052(6) Å, c = 14.1451(8) Å, α = 66.617(6)°, β = 82.391(4)°, γ = 69.072(4)°, V = 1204.85(12) Å3, Z = 2, Rgt(F) = 0.0460, wRref(F2) = 0.1206, T = 100.00(10) K.

C31H50N2O2S, orthorhombic, P212121 (no. 19), a = 11.9922(9) Å, b = 16.7099(8) Å, c = 29.1262(16) Å, V = 5836.6(6) Å3, Z = 8, Rgt(F) = 0.0654, wRref(F2) = 0.1230, T = 293(2) K.

C25H18ClF3N2O3S, monoclinic, P21/n (no. 14), a = 9.9087(5) Å, b = 21.7843(10) Å, c = 10.2512(6) Å, β = 94.749(5)°, V = 2205.2(2) Å3, Z = 4, Rgt(F) = 0.0448, wRref(F2) = 0.1028, T = 100 K.

C25H18BrF3N2O3S, monoclinic, P21/n (no. 14), a = 9.9295(11) Å, b = 21.755(2) Å, c = 10.2358(11) Å, β = 95.022(10)°, V = 2202.6(4) Å3, Z = 4, Rgt(F) = 0.0373, wRref(F2) = 0.0795, T = 100(1) K.

BACKGROUND:The Bohai Sea contains a large amount of oil and gas, the main component of which is methane. The influence of natural or human factors will cause its leakage and migration and then have a negative impact on the environment. However, most of the methane would be oxidized by microorganisms during the leakage and migration processes. Meanwhile, the different environmental conditions will affect oxidation rate and carbon isotope fractionation of methane.OBJECTIVE:In order to better understand the law of isotope fractionation and methane oxidization in the sediments and to provide reference for further related research in this area, the Bohai Sea sediments were selected as laboratory raw materials for the degradation of laboratory experiments and are described in this paper.METHODS:Gas Chromatography and Gas Chromatography-Isotope Ratio Mass Spectrometry were used to determine the methane oxidation rate, and the carbon isotope fractionation coefficient ε of methane was determined.RESULTS:The results show that the aerobic oxidation of methane is dominant. Oxidation temperature and gas flow rate are the main factors affecting the rate of methane oxidation. In the mode of continuous incubation, when the temperature reduced from 28℃ to 15℃, the average oxidation rate reduced by 60%±10%, indicating that the lower temperature is not helpful for methane oxidation. When the gas flow rate increases from 50 to 150 μL/min, the average oxidation rate of methane increases by 90%±10%. This indicates that the higher gas flow rate is favorable to the increase of oxidation rate. It is also found that the fractionation effect of carbon and hydrogen isotopes are mainly affected by temperature where the fractionation degree is positively correlated with temperature.CONCLUSIONS:Temperature is an important factor affecting methane oxidation rate and isotopic fractionation.

C30H52O3, orthorhombic, P212121 (no. 19), a = 6.71147(14) Å, b = 16.6565(4) Å, c = 25.0815(6) Å, V = 2803.85(11) Å3, Z = 4, Rgt (F) = 0.0405, wRref (F2) = 0.1092, T = 293(2) K.

C27H18FN3O3S, monoclinic, P21/c (no. 14), a = 8.091(6) Å, b = 42.84(3) Å, c = 7.096(6) Å, β = 107.806(10)°, V = 2342(3) Å3, Z = 4, Rgt(F) = 0.0616, wRref(F2) = 0.1321, T = 173(2) K.

Gas hydrate is a form of non-stoichiometric clathrate compound which is produced by hydrocarbon gas molecules and water molecules at high pressure and low temperature. Usually under atmospheric pressure and room temperature, the hydrate sample is easy to decompose and thus the analysis must be carried out at low temperature. The analysis conditions of powder X-ray Diffraction for natural gas hydrate is the focus of this study. The influencing factors (i.e., increment, scan speed, cumulative number, and the temperature) were systematically studied to optimize the analytical parameters. As a result, a powder X-ray Diffraction method to measure the crystal structure of gas hydrate is proposed. This method has been used successfully to measure the crystal structure of the hydrate samples from both the laboratory and the Pearl River Mouth basin in the South China Sea. The results show that the hydrate samples have a similar cubic crystal structure. Both the gas hydrate from the Pearl River Mouth basin in the South China Sea and the synthetic methane hydrate in the laboratory belong to the type I hydrate and have unit cell parameters of 11.9309×10-10 m and 11.9135×10-10 m, respectively. This method can be used to obtain the structural information of gas hydrate, and will provide a technical support for further research of gas hydrate in China.

C7H6BrN5, triclinic, P1̄ (no. 2), a = 8.3319(4) Å, b = 10.0666(5) Å, c = 11.4042(6) Å, α = 107.213(5)°, β = 99.394(4)°, γ = 95.540(4)°, V = 890.71(8) Å3, Z = 4, Rgt(F) = 0.0452, wRref(F2) = 0.0972, T = 293(2) K.

The aim of the present study was to assess the wound-healing efficiency of the Prunella vulgaris extract (PVE) on thermally injured rats. Sixty adult, female rats were divided into four groups, with group I serving as a sham control (without a burn injury). A burn was inflicted on the dorsum of all the rats in the second, third and fourth groups. Group II rats served as the burn-injury control group without any treatment. The burn-injured areas of the rats in the third and fourth groups were treated topically by 1% silver sulfadiazine (SSD) cream or 10% PVE-based cream, respectively. Biochemical (antioxidant, lipid peroxidation, hydroxyproline, mucopolysaccharide), morphological and histopathological evaluations showed the burn-healing efficiency of PVE to be better than that of the SSD group. In conclusion, topical application of PVE enhanced collagen synthesis and antioxidant levels by suppressing lipid peroxidation as well as increasing proliferation of keratinocytes, and thus positively influenced wound-healing.

Background: The objective of this study is to detect HMGA2 expression in renal carcinoma to explore its relationship with clinicopathology and its significance in prognosis. Methods: Expressions of HMGA2 mRNA and protein were detected in 50 renal carcinoma specimens, 50 corresponding adjacent normal kidney tissue samples and 40 renal benign tumour specimens via reverse transcription polymerase chain reaction and immunohistochemical assay. Expression analysis was performed along with clinical data analysis. Results: The relative expression levels of HMGA2 mRNA in renal carcinoma, renal benign tumour tissues and adjacent normal renal tissues were 0 .8 4± 0.23, 0.19± 0.06 and 0 .0 8± 0.04, respectively. HMGA2 protein positive rates were 68.0%, 7.5% and 2.0%, with a significant difference (P< 0.05). HMGA2 expression was not significantly correlated with gender, age, tumour size and histological type (P> 0.05), but was significantly correlated with TNM stages and lymph node metastasis (P< 0.05). Conclusions: The expressions of HMGA2 gene and protein in renal carcinoma were closely correlated with tumour formation, progression and metastasis. HMGA2 may become a powerful new pathological marker and prognostic factor for renal carcinoma.

Natural gas hydrates are clathrate hydrates formed from gas molecules (e.g. hydrocarbon gases and non-hydrocarbon gases such as CO2 and H2S) and water molecules under high pressure and low temperature, with three types of crystal structure, such as cubic (Ⅰ), rhombus (Ⅱ) and hexagonal (H). The structural characteristics and variation rule of clathrate hydrate is significant for understanding the formation mechanism, micro-kinetic, phase transformation and identification of gas hydrate. X-ray Diffraction (XRD) is an analytical technique that is used to analyze the crystal micro-structure (i.e. atom orientation) based on the diffraction pattern produced by X-ray irradiating the crystal or some non-crystal substances. When XRD is applied in gas hydrate research, not only can it provide the important information such as structure type and lattice parameter of gas hydrate, but it can also be used to observe the micro-kinetic process of hydrate formation and dissociation. Several applications of XRD in natural gas hydrates research, such as structural characteristics, in situ observation of gas hydrates formation/dissociation, and hydrate sample identification on field are reviewed in this paper. It is well known that the crystal lattice of structure Ⅰ and Ⅱ is approximately 12.0×10-10 m and 17.3×10-10 m, respectively, and approximately 12.2×10-10 m and 10.0×10-10 m along a and c axis for structure H. Therefore, the crystal structure type can be easily identified with the accurate lattice parameters measured by XRD. Now, the XRD technique has been already conducted in identifying and obtaining the structural information of gas hydrate samples recovered from marine and permafrost region overseas. In addition, the structure transformation and influencing factors of gas hydrate can be investigated based on the lattice parameter variation of gas hydrate, which was measured under different conditions. The experimental results show that all the mixture composition, the volume and diameter of guest molecules as well as the temperature can affect the lattice parameter and structure of gas hydrate. In situ XRD technique under high pressure is also used to measure the variation of diffraction peaks during gas hydrate formation/dissociation, and eventually to investigate the kinetic processes of gas hydrate formation and dissociation. The results show that two stages were observed during gas hydrate formation/dissociation, the fast process of hydrate formation/dissociation on the gas-liquid (solid) surface and the gas molecules diffusion process in the liquid (solid). The last stage controls the whole reaction speed. At present, although the XRD technique is widely used in gas hydrate research abroad, it is just beginning in China. It is believed that the XRD technique can be used in gas hydrate research to resolve the basic scientific problems such as structure type identification and lattice parameter measurement, and will provide a powerful technological support for gas hydrate relevant theory research once it combines with other analytical techniques like NMR, IR and X-CT.

Natural gas hydrate can only steadily exist at lower temperature and higher pressure, otherwise it will decompose into gas and water. Hereby, the pre-treatments (sample preservation, preparation, etc.) are very important to the accurate measurement of gas components of gas hydrate. Described in this paper are the pre-treatment technologies of gas hydrate that were studied experimentally, mainly including the optimal preservation temperature under atmospheric pressure, the optimal decomposition methods, the optimal ways of gas collecting and storing, and the removal methods of non-hydrate gases. The results indicate that the best temperature for gas hydrate storage is less than -100℃ under atmospheric pressure. The headspace method and syringe method can be widely used in hydrate-bound gases′ decomposition and collection, however, the drainage method was not suitable for hydrate samples containing CO2. It was more beneficial to place the sample at -80℃ to remove the non-hydrate gases absorbed on the surface of the specimen. In addition, the use of a glass bottle with butyl rubber plug for storage of hydrate decomposition gases instead of aluminum-plastic air bag is preferential, and the optimum time to finish the analysis of molecular compositions is within 5 days.