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尼古丁唾液測(cè)試紙 廣州創(chuàng)侖
廣州健侖生物科技?有限公司
本司長(zhǎng)期供應(yīng)尼古丁(可替寧)檢測(cè)試劑盒,其主要品牌包括美國(guó)NovaBios、廣州健侖、廣州創(chuàng)侖等進(jìn)口產(chǎn)品,國(guó)產(chǎn)產(chǎn)品,試劑盒的實(shí)驗(yàn)方法是膠體金方法。
我司還提供其它進(jìn)口或國(guó)產(chǎn)試劑盒:登革熱、瘧疾、流感、A鏈球菌、合胞病毒、腮病毒、乙腦、寨卡、黃熱病、基孔肯雅熱、克錐蟲(chóng)病、違禁品濫用、肺炎球菌、軍團(tuán)菌等試劑盒以及日本生研細(xì)菌分型診斷血清、德國(guó)SiFin診斷血清、丹麥SSI診斷血清等產(chǎn)品。
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【包裝規(guī)格】
1人份/袋,40人份/盒
【預(yù)期用途】
尼古丁(Nicotine)是煙草中的主要生物堿,是導(dǎo)致吸煙成癮的物質(zhì)動(dòng)因,也是評(píng)價(jià)人體攝入煙草煙霧的常用指標(biāo)。但因?yàn)槟峁哦“胨テ诙蹋瑹o(wú)法作為標(biāo)志物檢測(cè),其代謝物可替寧因?yàn)榘胨テ陂L(zhǎng)作為吸煙和戒煙的標(biāo)志物。
本品采用競(jìng)爭(zhēng)抑制法和膠體金免疫層析技術(shù),用于快速定性檢測(cè)人體唾液中的可替寧,適用于評(píng)價(jià)煙草煙霧攝入的初步篩查。
【主要組成成份】
【檢驗(yàn)方法】
尼古丁唾液測(cè)試紙
因此,可通過(guò)縮短引物序列或取消引物序列對(duì)核酸庫(kù)進(jìn)行優(yōu)化。在雙RNA庫(kù)篩選方法中,設(shè)計(jì)的核酸庫(kù)的引物序列可自身折疊互補(bǔ),在引物區(qū)形成雙鏈結(jié)構(gòu),從而使引物序列與靶分子的非特異性格結(jié)合可能性格大大降低。適配體 (Aptamer) 是一種經(jīng)體外篩選技術(shù)得到的寡核苷酸序列 (RNA或 DNA),與相應(yīng)的配體有嚴(yán)格的識(shí)別能力和高度的親和力,大小一般約6-40 kDa。單鏈寡核苷酸,特別是RNA的一些二級(jí)結(jié)構(gòu),如發(fā)夾、莖環(huán)、假節(jié)、凸環(huán)、G-四聚體等,可使核酸分子形成多種三維結(jié)構(gòu),成為適配體與靶物質(zhì)特定區(qū)域結(jié)合的基礎(chǔ),二者之間的結(jié)合主要通過(guò)“假堿基對(duì)”的堆積作用、氫鍵作用、靜電作用和形狀匹配等產(chǎn)生高特異性的結(jié)合力。適配體具有高特異性、靶分子廣、易于體外合成和修飾等優(yōu)點(diǎn),已經(jīng)在基礎(chǔ)研究、臨床診斷和治療中顯示了廣闊的應(yīng)用前景。
適配體的體外篩選過(guò)程稱(chēng)為指數(shù)富集配體系統(tǒng)進(jìn)化技術(shù) (Selective expansion of ligends by exponential enrichment,SELEX),主要是模擬自然進(jìn)化人工篩選技術(shù)。首先體外化學(xué)合成一個(gè)隨機(jī)堿基數(shù)為n的單鏈寡核苷酸文庫(kù),該文庫(kù)則含4n個(gè)不同的寡核苷酸序列,常用的寡核苷酸隨機(jī)序列含30個(gè)堿基,庫(kù)容量高達(dá)430 (1018)。隨機(jī)序列的兩端是隨后PCR循環(huán)時(shí)結(jié)合引物所必需的固定序列,由于這種隨機(jī)序列,而決定了庫(kù)中每條鏈自然形成的空間構(gòu)象,即二級(jí)結(jié)構(gòu)的多樣性,決定了庫(kù)中潛在地存在能與各種蛋白和低分子靶物質(zhì)有親和力的核酸配體。一般篩選文庫(kù)的容量巨大 (可達(dá)1015左右),理論上應(yīng)用SELEX技術(shù)能篩選到自然界幾乎所有靶分子的適配子。篩選過(guò)程包含和達(dá)爾文進(jìn)化理論一樣的3個(gè)過(guò)程,分別是自發(fā)突變、自然選擇、大量增殖。一般包括幾輪篩選,每輪循環(huán)包括3個(gè)主要步驟:
(1)寡核苷酸庫(kù)和靶標(biāo)分子孵育;
(2)寡核苷酸復(fù)合物和未結(jié)合的寡核苷酸分離;
(3)結(jié)合的序列用PCR擴(kuò)增,再進(jìn)入下輪的篩選過(guò)程。
想了解更多的韓國(guó)SD產(chǎn)品及服務(wù)請(qǐng)掃描下方二維碼:我司還提供其它進(jìn)口或國(guó)產(chǎn)試劑盒:登革熱、瘧疾、流感、A鏈球菌、合胞病毒、腮病毒、乙腦、寨卡、黃熱病、基孔肯雅熱、克錐蟲(chóng)病、違禁品濫用、肺炎球菌、軍團(tuán)菌等試劑盒以及日本生研細(xì)菌分型診斷血清、德國(guó)SiFin診斷血清、丹麥SSI診斷血清等產(chǎn)品。
二維碼掃一掃
【公司名稱(chēng)】 廣州健侖生物科技有限公司
【】 楊永漢
【】
【騰訊 】
【公司地址】 廣州清華科技園創(chuàng)新基地番禺石樓鎮(zhèn)創(chuàng)啟路63號(hào)二期2幢101-3室
【企業(yè)文化宣傳】
Therefore, the nucleic acid library can be optimized by shortening the primer sequence or eliminating the primer sequence. In the double-RNAi screening method, the primer sequences of the designed nucleic acid libraries can fold and complement themselves, forming a double-stranded structure in the primer region, so that the non-specific lattice combination of the primer sequences and target molecules may be greatly reduced. Aptamer is an oligonucleotide sequence (RNA or DNA) obtained by in vitro screening and has a strict recognition capacity and high affinity with the corresponding ligand. The size is generally about 6-40 kDa. Some secondary structures of single-stranded oligonucleotides, especially RNA, such as hairpins, stem loops, pseudoknots, convex rings, G-tetramers and the like, enable the nucleic acid molecules to form various three-dimensional structures and become aptamers The basis of binding to a specific region of the target substance, the binding between the two mainly through the "pseudo base pair" stacking effect, hydrogen bonding, electrostatic interaction and shape matching to produce high specific binding force. Aptamers have the advantages of high specificity, wide target molecules, easy synthesis and modification in vitro, and have shown broad application prospects in basic research, clinical diagnosis and treatment.
The in vitro screening of aptamers is called Selective expansion of ligends by exponential enrichment (SELEX), and is mainly based on artificial evolutionary artificial screening techniques. First, a chemically synthesized single-stranded oligonucleotide library with a random number of nucleotides n, which contains 4n different oligonucleotide sequences. The commonly used oligonucleotide random sequence contains 30 bases. The library capacity Up to 430 (1018). At both ends of the random sequence is the fixed sequence necessary for the subsequent primer binding to the primer during the PCR cycle. Due to this random sequence, the spatial conformation naturally formed by each strand in the library, ie the diversity of the secondary structure, There are potentially nucleic acid ligands that have affinity for various proteins and low molecular weight target substances. The general screening library has a huge capacity (up to about 1015). In theory, aptamers of almost all target molecules in nature can be screened by SELEX technology. The screening process contains the same three processes as Darwin's theory of evolution, namely spontaneous mutation, natural selection and mass proliferation. Generally includes several rounds of screening, each cycle consists of three main steps:
(1) oligonucleotide pool and target molecule incubation;
(2) separation of the oligonucleotide complex from the unbound oligonucleotide;
(3) The combined sequences are amplified by PCR and then into the next round of screening.
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