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2021年9月在沈阳市蒲河湿地公园(41°41′54″N,122°52′19″E,海拔35 m)采集到3号无尾两栖类动物,经形态特征比较确认为侧褶蛙属(Pelophylax)金线侧褶蛙种组(P.plancyi species complex)的物种。基于线粒体12S rRNA和16S rRNA基因联合构建的侧褶蛙属部分物种最大似然系统发育树显示,采集到的侧褶蛙标本与朝鲜侧褶蛙(P.chosenicus)聚为一支,且具有较高的支持率(0.95)。综合形态和系统发育比较,确定采集到的标本为无尾目(Anura)蛙科(Ranidae)侧褶蛙属的朝鲜侧褶蛙,系中国两栖动物分布新记录种。 相似文献
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2023年4月21日,在湖南南山国家公园开展野生动物多样性调查过程中,于白云湖(26°18′36.23″N,110°20′05.43″E;海拔606 m)采集到2号蛙类标本(1雌1雄),经初步形态鉴定,其与桂北琴蛙(Nidirana guibeiensis)特征相似。对采集标本的线粒体16S r RNA进行PCR扩增测序后,构建琴蛙属(Nidirana)部分物种贝叶斯系统发育树,结果显示该蛙类标本与桂北琴蛙聚为一支,且具有较高的支持率(1.00);基于Kimura双参数模型估算,该标本与广西兴安县采集的桂北琴蛙标本间的遗传距离为0,远小于琴蛙属不同种间的遗传距离(3.2%~8.7%)。经形态特征鉴定和系统发育分析,确定该蛙类标本为无尾目(Anura)蛙科(Ranidae)琴蛙属(Nidirana)桂北琴蛙,为湖南省两栖动物新记录种。 相似文献
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云南省发现弄岗狭口蛙 总被引:1,自引:0,他引:1
2018年6月,在位于云南省文山壮族苗族自治州的文山国家级自然保护区(23°21′41″N,104°50′26″E,海拔1 300 m)采集到无尾目(Anura)姬蛙科(Microhylidae)狭口蛙属(Kaloula)标本3号,包括雄性成体标本1号和雌性成体标本2号,并对相应形态特征进行了测量,雄性头体长为35.79mm,雌性头体长为48.01 mm和42.78 mm。根据形态特征比较发现,该种群的标本皮肤光滑,背部呈橄榄绿色,有不规则的深绿色斑纹,指端平切且具两排小乳突,雄性胸部有小柠檬黄色斑点,雄性全蹼,雌性为1/3蹼,与采集自弄岗国家级自然保护区的弄岗狭口蛙(K. nonggangensis)地模标本(海拔186 m)的形态鉴定特征基本一致,仅体色和体型大小稍有差异。基于16S rRNA基因片段进行系统发育分析表明,这些标本与弄岗狭口蛙模式产地标本聚在一起,共享同一单倍型。可以确定所采集的3号标本均为弄岗狭口蛙,为云南省两栖纲分布新记录物种。新发现的种群分布于中高海拔处,较地模标本的低海拔分布记录有较大的拓展。该物种的发现说明,云南东南部与广西西南部的喀斯特地区具有相似的物种组成,对该区域将来的生物地理学研究具有重要意义。 相似文献
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2020年8月6日在贵州省威宁县雪山镇(27°04′09″N,104°04′44″E,海拔2 218 m)采集到6号两栖动物标本,经形态特征比较,与景东臭蛙(Odorrana jingdongensis)相似;基于线粒体16S rRNA构建臭蛙属(Odorrana)部分物种系统发育树,此次采集的臭蛙标本与景东臭蛙聚为一支,且具有较高的支持率(0.97/92,贝叶斯法/最大似然法);基于Kimura双参数模型估算本次采集的臭蛙标本与景东模式产地标本间的遗传距离为0%,远小于臭蛙属物种间的遗传距离(1.3%~9.5%)。综合形态特征和分子系统发育比较,确定此次采集到的臭蛙标本为无尾目(Anura)蛙科(Ranidae)臭蛙属的景东臭蛙,系贵州省两栖动物分布新记录种。 相似文献
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A new polynitro cage compound 2, 4, 6, 8, 10, 12, 13, 14, 15-nonanitro-2, 4, 6, 8, 10, 12, 13, 14, 15-nonaazaheptcyclo [5.5.1.1(3,11).1(5,9)] pentadecane (NNNAHP) was designed in the present work. Its molecular structure was optimized at the B3LYP/6-31 G(d,p) level of density functional theory (DFT) and crystal structure was predicted using the Compass and Dreiding force fields and refined by DFT GGA-RPBE method. The obtained crystal structure of NNNAHP belongs to the P-1 space group and the lattice parameters are a = 9.99 ?, b = 10.78 ?, c = 9.99 ?, α = 90.01°, β = 120.01°, γ = 90.00°, and Z = 2, respectively. Based on the optimized crystal structure, the band gap, density of state, thermodynamic properties, infrared spectrum, strain energy, detonation characteristics, and thermal stability were predicted. Calculation results show that NNNAHP has detonation properties close to those of CL-20 and is a high energy density compound with moderate stability. 相似文献
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Summary Concentration of N, P, K, Ca, Mg and S in summer groundnut crop was higher than in kharif while Zn, Fe, Mn and Cu contents were higher in summer crop. Kernel's N, P and Zn; Leaflet's Ca and Mn; Stem's K and Fe; Root's S and Cu and Petiole's Mg contents were highest. Shell's N, P, K, Mg, S, Zn and Cu; Kernel's Ca, Fe and Mn contents were the least. N, P, K, S, Zn and Cu concentrations decreased linearly as the crop grew. Ca, Mg, Fe and Mn concentrations did not display any distinct pattern. Ca concentration was positively correlated with pod yield in both the seasons. 相似文献
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The goal of this article was to establish reference ranges of the concentration of trace elements in human serum and to compare
these results with those reported by other authors. We describe the sample preparation and measurement conditions that allow
the rapid, precise, and accurate determination of Al, As, B, Be, Cd, Co, Cu, Fe, Li, Mn, Mo, Ni, Rb, Se, Sr, and Zn in human
serum samples (n=110) by inductively coupled plasma-mass spectrometry (ICP-MS). Accuracy and precision were determined by analyzing three
reconstituted reference serum samples by comparison with other methods and by the standard addition procedure.
The advantages of the ICP-MS method include short time of analysis of the elements mentioned, low detection limit, high precision,
and high accuracy. Disadventages include a high risk of contamination due to the presence of some of the elements of interest
in the environment, the relatively delicate sample handling, and the high cost of the equipment. 相似文献
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G. V. Iyengar 《Biological trace element research》1987,12(1):263-295
This report attempts to formulate reference ranges of elemental concentrations for 15 trace elements in selected human tissues
and body fluids.
A set of samples consisting of whole blood, blood serum, urine, milk, liver, and hair were chosen and considered for 15 elements
of biological significance: As, Cd, Co, Cr, Cu, F, Fe, I, Hg, Mn, Mo, Ni, Pb, Se, and Zn. The results represent wholly or
partially data received from 40 countries of the global regions of Africa, Asia, Europe, North, South, and Central America,
Australia, and New Zealand.
This survey, even if qualitative, has been useful in demonstrating certain trends of trace-element scenarios around the world.
It is of course recognized that both diet and environment exert a strong influence on the distribution pattern of several
elements, such as As, Cd, Mn, Pb, Se, and Zn. A limited comparison of the available information on soil status of different
countries reflected some interesting associations for elements, such as Mn and Zn.
Importantly, this study revealed that only a few countries were in a position to identify a reasonable amount of data on samples
requested for this project. Regretably, for a number of countries, any dependable data for even such essential elements as
Cu, Fe, and Zn were not available.
In view of the nutritional importance of many elements, the time is ripe for concerted efforts by intergovernmental agencies
to initiate investigations or commission task forces/projects to generate reliable reference data for selected global regions,
which sadly lack data of any kind at present. 相似文献
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The variation with age of the 18 trace element mass fractions and some histological characteristics of intact prostate glands of 50 subjects aged 0–30 years was investigated by instrumental neutron activation analysis, inductively coupled plasma atomic emission spectrometry, and a quantitative morphometric analysis. Mean values ± standard error of the mean (M ± SΕΜ) for the mass fractions (in milligrams per kilogram wet tissue) of these trace elements in pre-puberty were: Al 28.5 ± 9.0, B 0.40 ± 0.11, Ba 1.48 ± 0.44, Br 10.5 ± 1.5, Ca 241 ± 30, Cl 3,203 ± 278, Cu 3.51 ± 0.89, Fe 33.7 ± 4.1, K 2,364 ± 145, Li 0.020 ± 0.004, Mg 153 ± 23, Mn 0.46 ± 0.06, Na 2,286 ± 130, P 1,391 ± 100, S 1,698 ± 132, Si 62 ± 11, Sr 0.38 ± 0.08, and Zn 27.6 ± 2.3. During puberty and postpuberty, when there is a significant increase in circulating androgens, the mean values were: Al 7.2 ± 1.4, B 0.21 ± 0.05, Ba 0.25 ± 0.06, Br 5.8 ± 1.0, Ca 433 ± 81, Cl 2,314 ± 201, Cu 1.77 ± 0.13, Fe 20.9 ± 1.6, K 2,585 ± 118, Li 0.0088 ± 0.0014, Mg 232 ± 27, Mn 0.34 ± 0.04, Na 1,875 ± 107, P 1,403 ± 98, S 1,673 ± 73, Si 22.2 ± 3.1, Sr 0.22 ± 0.03, and Zn 93.3 ± 8.9. Mean values (M ± SΕΜ) of percent volumes (%) of the stroma, epithelium and lumen in the prostate before puberty were 73.4 ± 2.6, 20.4 ± 1.7, and 4.45 ± 0.94, respectively, versus 46.5 ± 2.5, 38.5 ± 1.9, and 14.9 ± 1.2 during puberty and postpuberty. This work’s results confirm that the Zn mass fraction in prostate tissue is an androgen-dependent parameter. For the first time it has been demonstrated that the glandular lumen is a main pool of Ca, Mg, and Zn accumulation and that the stroma is a main pool of Al, B, Ba, Br, Cl, Cu, Fe, Mn, Na, and Si accumulation in the normal human prostate, for the age range 0–30 years. It was concluded that the Ca, Mg, and Zn binds tightly within the prostatic fluid, because the volume of glandular lumen reflects the volume of prostatic fluid. 相似文献
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Vladimir Zaichick Sofia Zaichick Vasilii Karandashev Sergey Nosenko 《Biological trace element research》2009,129(1-3):107-115
The effect of age and gender on major, minor, and trace element contents in the intact rib bone of 80 relatively healthy 15–55-year-old women and men was investigated. Contents or upper limit of contents of 16 chemical elements in the rib bone were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). Mean values (M?±?SΕΜ) for the mass fraction of Ba, Ca, Cu, Fe, K, Li, Mg, Na, P, S, Sr, and Zn (milligram per kilogram of dry bone) were as follows: 2.54?±?0.16, 171,400?±?4,050, 1.35?±?0.22, 140?±?11, 1,874?±?71, 0.049?±?0.011, 2,139?±?38, 5,378?±?88, 75,140?±?1,660, 1,881?±?51, 291?±?20, and 92.8?±?1.5, respectively. The upper limits of contents of Al, B, Mn, and V were <7.20, <0.65, <0.36, and <0.03, respectively. Statistically significant tendency for the Ca, Mg, and P content to decrease with age was found in the human rib bone, regardless of gender. The mass fraction of Fe in the male rib bone increases with age. It was shown that higher Ca, Mg, Na, P, and Sr mass fractions as well as lower Fe content were typical of female ribs as compared to those in male ribs. 相似文献
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Oral cancer is one of the main causes of cancer-related deaths in South-Asian countries. There are very limited treatment options available for oral cancer. Research endeavors focused on discovery and development of novel therapies for oral cancer, is necessary to control the ever rising oral cancer related mortalities. We mined the large pool of compounds from the publicly available compound databases, to identify potential therapeutic compounds for oral cancer. Over 84 million compounds were screened for the possible anti-cancer activity by custom build SVM classifier. The molecular targets of the predicted anti-cancer compounds were mined from reliable sources like experimental bioassays studies associated with the compound, and from protein-compound interaction databases. Therapeutic compounds from DrugBank, and a list of natural anti-cancer compounds derived from literature mining of published studies, were used for building partial least squares regression model. The regression model thus built, was used for the estimation of oral cancer specific weights based on the molecular targets. These weights were used to compute scores for screening the predicted anti-cancer compounds for their potential to treat oral cancer. The list of potential compounds was annotated with corresponding physicochemical properties, cancer specific bioactivity evidences, and literature evidences. In all, 288 compounds with the potential to treat oral cancer were identified in the current study. The majority of the compounds in this list are natural products, which are well-tolerated and have minimal side-effects compared to the synthetic counterparts. Some of the potential therapeutic compounds identified in the current study are resveratrol, nimbolide, lovastatin, bortezomib, vorinostat, berberine, pterostilbene, deguelin, andrographolide, and colchicine. 相似文献