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1.
A级马铃薯生产技术对于自然环境的选择,要考虑多种因素。现代都提倡食用绿色产品,绿色产品不仅有益身体健康。在栽植过程中对自然环境的危害也非常小。因此本文将针对绿色A级马铃薯的生产技术全面的阐述。为后续的生产栽植提供一定的参考作用。 相似文献
2.
《中国科学院院刊(英文版)》2014,(1):11-12
<正>A major ST event in the world refers to an ST activity and its achievements with worldwide influence,including:1.A transformative breakthrough in fundamental scientific understanding,which gives rise to systematic ST innovation,and multiple technological innovation clusters,such as the discovery of electromagnetic induction and the establishment of electromagnetic theory;2.Discovery of phenomena unexplainable by the existing theoretical system,like blackbody radiation discovery gave birth to quantum mechanics;3.A transformative technological breakthrough 相似文献
3.
以武川鲜马铃薯为原料,采用水提取法和溶剂提取方法,得到了武川马铃薯淀粉的产率,并对武川马铃薯淀粉提取的影响因素进行了分析。结果表明:红皮马铃薯淀粉得率为5.25%;白皮马铃薯淀粉得率为5.75%。马铃薯淀粉的实验室提取的最优条件为马铃薯去皮,用水浸泡3h,反复过滤3次,烘干温度40℃,烘干时间为40min。 相似文献
4.
我国科技核心期刊动态性调查与分析 总被引：3，自引：0，他引：3
Based on the 2nd and 3rd editions of A Guide to Core Journals of China, this article makes an investigation on the change of the number, the variety and the ranking of the core journals of science and technology which are on the same subject. The basic dynamic characteristics of the core journals of science and technology in China are described. 相似文献
5.
《中国科学院院刊(英文版)》2003,17(1)
A research group headed byProf. Yu Shuyan with StateKey Laboratory of Polymer Phys-ics and Chemistry of the CAS Insti-tute of Chemistry has made progressin self-assembly nanostructure.Their findings on modular cavity-tunable self-assembly of molecularbowls and crowns as structural ana-logues of calix[3]arenas were re-ported in the February 10 issue ofGerman journalAngewandte ChemieInternational Edition.The scientists havesuccessfully made a se-ries of size-alterablefunctional nanometri… 相似文献
6.
《中国科学院院刊(英文版)》2013,(4):202-202
Representing new states of quantum matter, topological insulators are characterized by an insulating gap in the bulk state and a robust metallic surface or edge state protected by time-reversal symmetry. Topological surthce states have been theoretically predicted and experimentally observed in three-dimensional materials such as A2B3-type compounds of Bi2Se3, Bi2Te3, and Sb,Te3. Similar to topological insulators, 相似文献
7.
《中国科学院院刊(英文版)》2007,21(4):253-256
WATCH Ecology Aged forests could still act as carbon sinks..........................2 China leads the world in ecosystem network development......197 Physics A new feat of powerful laser system....................................3 A state-of-the-art photoemission spectroscopy......................7 CAS scientists develop demo devices of a new MRAM..........74 New method for making super-plastic glasses...................80 Small angle x-ray scattering station operational...............20… 相似文献
8.
In the work mitotic chromosomes in root-tips of 7 species native to Sichuan Pro-
vince were examined and their karyotypes were analysed based on 7-8 cells at mitotic meta-
phase, using Levan et al.'s (1964) nomenclature. The list of species and origin of the materials
used in this work are provided in the appendix. The micrographs of mitotic metaphase of all
the materials are shown in Plates 1 and 2; the idiograms in Fig. 1, 1-9, and the parameters
of chromosomes are provided in Tables 1-9. All the chromosome countings and karyotypes in
this paper are reported for the first time.
Characteristics of the karyotypes may be summarized as follows:
1. 2n=38 are found in all the materials except A. sichuanensis, which has 3 cytotypes, i.e,
2n=38+5B, 2n=38+lB and 2n=38+OB (Plate 2, 1-2, Fig. 1, 5-6).
2. The karyotypes are of two major types: the karyotype of A. flaviflora falls into 3C in
Stebbins's (1958, 197l) classification of karyotypes and those of all the other species into 2C.
The two types are also different from each other in the number of large and medium-sized
chromosomes pairs and morphology of the first pair of chromosomes (compare Plate 2, 5, Fig.
1, 9 with the other micrographs and idiograms).A. flaviflora with the karyotype 3C also differs
from the other species in a series of gross morphological characters: the species is of a yellow and
campanulate corolla.
3. The species with caespitose leaves (A. caespitosa and A. omeiensis) have essentially the
same karyotype, which is rather different from those of the species with scattered leaves. There
are two pairs of small sm chromosomes (arm ratio ≥1.90) in the former karyotype (Tables 1
and 3), but all the small chromosomes are m or sm with arm ratio <1.80 in the latter karyotypes. 相似文献
9.
《中国科学院院刊(英文版)》2004,18(3):151-151
Because of its outstanding performance, an aligned nanotube film with micropatterns has been a research focus in the field of nano-science and technology. Although quite a number of researchers have been successful in constructing such patterns, the precondition for the success, until recently, is to obtain the patterned substrates in advance.A research group at the CAS Institute of Chemistry (ICCAS) has succeeded in self-assembly of threedimensional (3-D) micropatterns on aligned carbon nanotube films. 相似文献
10.
《中国科学院院刊(英文版)》2004,(3)
Because of its outstanding performance, an aligned nan otub e film w ithmicropatterns has been a researchfocus in the field of nano-scienceand technology. Although quite anumber of researchers have beensuccessful in constructing suchpatterns, the precondition for thesuccess, until recently, is to obtainthe patterned substrates in advance.A research group at the CAS Insti-tute of Chemistry (ICCAS)has suc-ceeded in self-assembly of three-dimensional(3-D)micropatternsonaligned … 相似文献
11.
A new shell-type faint radio Supernova Remnant 《中国科学院院刊(英文版)》2007,21(3):135-136
A new shell-type faint radio Supernova Remnant(SNR) has been discovered by CAS astronomer TIAN Wenwu and his Canadian colleagues, as reported in the April 3 issue of Astronomy and Astrophysics. 相似文献
12.
《中国科学院院刊(英文版)》2006,(3)
A75-meter-long, 3-phase and 10.5 kV/1.5kA high temperature supercon- ducting (HTS) power cable, a brain- child of researchers from the CAS Institute of Electrical Engineering (IEE), has been operating stably and reliably over 7,000 hours in a power distri… 相似文献
13.
《中国科学院院刊(英文版)》2006,20(3)
A75-meter-long, 3-phase and 10.5 kV/1.5kA high temperature superconducting (HTS) power cable, a brainchild of researchers from the CAS Institute of Electrical Engineering (IEE), has been operating stably and reliably over 7,000 hours in a power distribution grid. 相似文献
14.
I. Different Meanings of the Scarlet Letter "A"1.1 The Changes of the Symbolic Meaning of the ScarletLetter “A”.In this novel, the scarlet letter "A" changes its meaningmany different times. This change is significant. It shows growthin the characters, and the community in which they live. Theletter "A" begins as a symbol of sin. It then becomes a symbolof alone and alienation, and finally it becomes a symbol of able,angel and admirable.1.1.1 AdulteryThe letter "A", worn on Hester's … 相似文献
15.
《中国科学院院刊(英文版)》2016,(4)
正A recent study conducted by researchers from the National Astronomical Observatories of the Chinese Academy of Sciences(NAOC)has shed new lights on the mass density of the dark matter in the local volume around the Sun.With carefully selected LAMOST data and a simple analytical Kz force model,they concluded that the volume density of the dark matter around us is 0.018±0.005M.pc~(-3),higher than the results of 相似文献
16.
With an illustration of the concept of quasi-integrative organization, this paper analyzes the input and output of enterprise management from the bargaining and the communion of knowledge. A general model of quasi-integrative organization is built. A bargaining framework of quasi-integrative organization from the bargaining frequency and the communion of knowledge is given. 相似文献
17.
《中国科学院院刊(英文版)》2003,17(3):134-135
A research project imple-mented by CAS scientistson the sustainable develop-ment of wild medicinal plant - Eri-geron breviscapus was well receivedat an evaluation panel organized byS&T Bureau of Yunnan Province onJuly 3.Erigeron breviscapus is a pe-rennial wild plant distributed in south-west Chinas Yunnan, Sichuan, andGuizhou provinces. It has been amajor resource for making variouskinds of pharmaceutical productsever since researchers found that itsextractions could be used to treatdise… 相似文献
18.
Zhang Shusheng 《中国科学院研究生院学报》1997,(1)
A simple and reproduciable method for determining guanine by high performance capillary electrophoresis is presented. The method involved the use of 2-amino-5-mercapto-3,4-dithiazole as internal standard and 40mmol/L borax-H3PO4 (pH2)-5% EtOH as.the background electrolyte. The result showed that the linear range for guanine is 5-300 mg/L with the recovery of 94%-98% , the detection limit of 2. 80 mg/L and the RSD of 3. 1%. The satisfactory result was obtained when it was used to detect the concentration of guanine in acyclovir product. 相似文献
19.
云南省马铃薯产业发展研究 总被引：3，自引：0，他引：3
马铃薯产业是云南省重点发展的农业产业之一。云南省是我国4个千万吨级马铃薯生产大省之一,位居全国第3位。云南省马铃薯产业发展受到气候、土地资源和交通状况、病虫害影响大,介入企业少、技术储备和先进种植技术推广应用不足等因素制约。要发展云南马铃薯产业应当明确发展思路,全力破解"买卖两难"、"四低"问题,坚持以科技为支撑,建立牢固科技链。 相似文献
20.
A comparison of morphology, karyotype and the chemical compounds among
“Jinxiong”, Ligasticum chuanxiong Hort. and L. chuanxiong cv. Fuxiong shows that “Jin-
xiong”, like L. chuanxiong cv. Fuxiong, is a triploid and its karyotype is similar to that of
L. chuanxiong with the formula K(2n)=33=24m+6sm+3st(SAT). Thin-layer chromato-
graphy of essential oils extracted from stem tubers confirms that the three taxa are extremely
alike in chemical compounds. Using the features of leaves and the forms of stem tubers, they
can be easily distinguished. A new triploid cultivar of L. chuanxiong Hort. i.e.L. chuan-xiong cv. Jinxiong is described for “Jinxiong” in the present paper. 相似文献