請(qǐng)幫忙列舉一下各種人體激素的類型(就是蛋白質(zhì),氨基酸或固醇)
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各種人體激素的類型(就是蛋白質(zhì),氨基酸或固醇),如:腎上腺素【氨基酸】
全部評(píng)論(4條)
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- 戀愛(ài)的幸福1 2011-06-08 00:00:00
- 蛋白類激素:下丘腦、垂體分泌的全是(抗利尿激素、促**腺激素釋放激素;生長(zhǎng)激素、催乳素、促激素),胰島素、胰高血糖素等
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- 子沫· 2011-06-08 00:00:00
- diyi類為類固醇,如腎上腺皮質(zhì)激素、性激素。 第二類為氨基酸衍生物,有甲狀腺素、腎上腺髓質(zhì)激素、松果體激素等。 第三類激素的結(jié)構(gòu)為肽與蛋白質(zhì),如下丘腦激素、垂體激素、胃腸激素、降鈣素等。 第四類為脂肪酸衍生物,如前列腺素。
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- 愛(ài)睡懶覺(jué)的moik 2011-06-07 00:00:00
- 蛋白類激素:下丘腦、垂體分泌的全是(抗利尿激素、促**腺激素釋放激素;生長(zhǎng)激素、催乳素、促激素),胰島素、胰高血糖素等; 氨基酸衍生物類:腎上腺素、甲狀腺激素 顧春雷:性激素、醛固酮
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- 劉通傻 2011-06-07 00:00:00
- 人的激素按化學(xué)結(jié)構(gòu)大體分為四類。 diyi類為類固醇,如腎上腺皮質(zhì)激素、性激素。 第二類為氨基酸衍生物,有甲狀腺素、腎上腺髓質(zhì)激素、松果體激素等。 第三類激素的結(jié)構(gòu)為肽與蛋白質(zhì),如下丘腦激素、垂體激素、胃腸激素、降鈣素等。 第四類為脂肪酸衍生物,如前列腺素。
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熱門問(wèn)答
- 請(qǐng)幫忙列舉一下各種人體激素的類型(就是蛋白質(zhì),氨基酸或固醇)
- 各種人體激素的類型(就是蛋白質(zhì),氨基酸或固醇),如:腎上腺素【氨基酸】
2011-06-06 02:20:24
566
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- 人體各種激素的功能
2018-11-13 05:54:17
440
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- 請(qǐng)幫忙翻譯一下,拜托
- A new kind of TiO2 nanotube array/Ni(OH)2 (TiO2/Ni(OH)2) composite electrode with the storage ability of light energy was prepared by the deposition of Ni(OH)2 on the TiO2 nanotube array, which was synthesized by anodizing Ti foils in an HF... A new kind of TiO2 nanotube array/Ni(OH)2 (TiO2/Ni(OH)2) composite electrode with the storage ability of light energy was prepared by the deposition of Ni(OH)2 on the TiO2 nanotube array, which was synthesized by anodizing Ti foils in an HF aqueous solution. SEM and XRD results showed that Ni(OH)2 particles were well distributed on high density, well-ordered and uniform TiO2 nanotube arrays. The photoelectrochemical properties of the TiO2/Ni(OH)2 electrode were investigated in NaHCO3/NaOH buffer solution (pH 10) by means of UV–vis absorption spectra, cyclic voltammogram (CV) and photocurrent measurements. It was found that the TiO2/Ni(OH)2 electrode was highly sensitive to light and exhibited excellent photoelectrochromic properties. Upon UV irradiation, the photogenerated holes by TiO2 nanotube arrays can oxidize Ni(OH)2 to NiOOH, and thus the TiO2/Ni(OH)2 electrode can be photo-charged by light。1. Introduction Among many visible light photocatalysts, TiO2nanostructures have attracted much attention due to high photocatalytic activ-ity, nontoxicity, chemical stability and huge potential applications [1–6]. The TiO2 nanotube array is one of most attention-getting TiO2nanostructures because of large surface area and outstanding charge transport properties. TiO2nanotube arrays can be utilized in dye-sensitized solar cells[7–9], photocatalysis and hydrogen gas sensing [10]. So far, a variety of methods have been attempted to prepare TiO2 nanotube arrays, such as hydrothermal synthe-sis[11], Langmuir–Blodgett technique [12], solution casting [13] and anodization technique[10,14], etc. Among these methods, the anodization technique has many advantages of low cost, low tem-perature and easy to be scaled up to large-area preparation. Recently, anewkindof photo-functional systemwith theenergy storage ability has been developed by coupling TiO2 photosen-sitive electrode with energy storage materials. In Takahashi and Tatsuma’swork[15],aTiO2/Ni(OH)2bilayer thinfilmwas suggested for the oxidative energy storage. In this case, a redox-activep-type semiconductor Ni(OH)2is coupled withn-type TiO2photocatalyst to formap–njunction,WhenTiO2is illuminatedby light, holesgen-erated at the junction are separated from excited electrons, trans-ported into the bulk of Ni(OH)2and oxidized Ni(OH)2to NiOOH. Therefore, the oxidative energy storage system was constructed 展開
2012-11-13 20:08:52
530
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- 不能參加人體蛋白質(zhì)合成的氨基酸
2016-10-20 14:22:51
488
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- 促甲狀腺激素釋放激素是氨基酸的衍生物還是蛋白質(zhì)
2014-04-05 00:29:38
658
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- 促甲狀腺激素釋放激素是氨基酸的衍生物還是蛋白質(zhì)
2018-11-30 18:25:41
419
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- 請(qǐng)各位大蝦幫忙翻譯一下:
- Withmorethan6millionnewmeasurementchannelssoldlastyear,NationalInstrumentsisaworldwideleaderinvirtualinstrumentation.Engineershaveusedvirtualinstrumentationformorethan25y... With more than 6 million new measurement channels sold last year, National Instruments is a worldwide leader in virtual instrumentation. Engineers have used virtual instrumentation for more than 25 years to bring the power of flexible software and PC technology to test, control, and design applications making accurate analog and digital measurements from DC to 2.7 GHz. This document provides an excellent introduction to virtual instrumentation as well as additional resources for continued research. What is virtual instrumentation? With virtual instrumentation, software based on user requirements defines general-purpose measurement and control hardware functionality. Virtual instrumentation combines mainstream commercial technologies, such as the PC, with flexible software and a wide variety of measurement and control hardware, so engineers and scientists can create user-defined systems that meet their exact application needs. With virtual instrumentation, engineers and scientists reduce development time, design higher quality products, and lower their design costs. 展開
2007-05-22 09:38:51
477
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- 請(qǐng)高手幫忙翻譯一下 3
- 2.2.1. Physical and physicochemical characterization The particle size distribution of the Ch-zeolite was determined using a laser diffraction equipment (CILASk 1064) and standard wet sieving (Mesh Tylerk series). Scanning electron mic... 2.2.1. Physical and physicochemical characterization The particle size distribution of the Ch-zeolite was determined using a laser diffraction equipment (CILASk 1064) and standard wet sieving (Mesh Tylerk series). Scanning electron microscopy (SEM-PHILIPSk XL20) was used for photomicrographs as well as to analyse the Ch-zeolite composition (Energy Dispersion X-ray, EDX). The sample was initially placed in a vacuum chamber for coating with a thin layer (few nanometers) of gold (Au). The specific surface area of the material was measured by the methylene blue technique and by nitrogen gas adsorption methods, with the latter also providing information about particle porosity. In the methylene blue adsorption method, aqueous solutions (50 ml) of methylene blue (100 mg l 1) were agitated using an orbital shaker (Marconik) for an hour at room temperature in the presence of different quantities of the Ch-zeolite (0.05–0.3 g). The suspensions were then allowed to settle for 23 h and the resulting supernatants were centrifuged at 5000 rpm before the analysis of the residual methylene blue concentration. Results obtained correspond to averaged values of three different experiments. The specific surface area was evaluated by the Langmuir model, assuming the formation, at high concentrations, of a dye monolayer and 1.08 nm2 molecule 1, for the cross-sectional area (Van den Hul and Lyklema, 1968). The Ch-zeolite specific surface area was evaluated by the nitrogen gas adsorption method, using automated equipment (Autosorb 1-Quantachrome Instrumentsk), employing multipoint BET isotherm adsorption data fitting. Also from these data, the porosity of the material was evaluated through parameters such as volume of total pores (d < 206 nm), surface area and volume of micropores (d < 2 nm; Micropore Analysis Method). Zeta potential measurements for the natural and ammonia loaded zeolite, as a function of medium pH, were determined using a Zeta Plusk equipment (Brookhaven Instruments). Suspensions (0.01% v/v) of the Ch-zeolite, previously sieved below 37 Am (400 Mesh Tylerk), in a 10 3 mol l 1 solution of KNO3 were used and the medium pH was controlled with the addition of HNO3 (pH< 7) and KOH (pH>7), separately. For the Ch-zeolite saturated with ammonia, suspensions of the material were prepared by the same procedure, except that the sample was loaded with 100 mg NH3–N l 1 of ammonia. 展開
2018-11-22 17:49:22
330
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- 請(qǐng)專家?guī)兔Ψg一下,謝謝!
- 粒度檢測(cè)方法與優(yōu)缺點(diǎn)比較 粉末粒度分布的測(cè)量方法經(jīng)過(guò)百余年的發(fā)展,據(jù)統(tǒng)計(jì)至少已經(jīng)發(fā)展了上百種,但隨著科技的發(fā)展,有些方法被逐步淘汰,有些方法得到了改進(jìn)和發(fā)展(如激光散射法、動(dòng)態(tài)光散射等), 并在生產(chǎn)、科研中得到了廣泛的應(yīng)用,現(xiàn)在普遍使用的測(cè)量... 粒度檢測(cè)方法與優(yōu)缺點(diǎn)比較 粉末粒度分布的測(cè)量方法經(jīng)過(guò)百余年的發(fā)展,據(jù)統(tǒng)計(jì)至少已經(jīng)發(fā)展了上百種,但隨著科技的發(fā)展,有些方法被逐步淘汰,有些方法得到了改進(jìn)和發(fā)展(如激光散射法、動(dòng)態(tài)光散射等), 并在生產(chǎn)、科研中得到了廣泛的應(yīng)用,現(xiàn)在普遍使用的測(cè)量方法有篩分法、顯微圖像法、光透沉降法、激光散射(衍射)法等幾種,下面簡(jiǎn)單介紹幾種常用的粒度測(cè)量方法。 ▲ 篩分法 是一種具有很長(zhǎng)歷史的粒度測(cè)定方法,篩分法粒度測(cè)量是利用一組篩孔大小不同的標(biāo)準(zhǔn)篩將粉末進(jìn)行篩分,然后對(duì)每個(gè)篩上樣品分別進(jìn)行稱重,進(jìn)而得到以質(zhì)量為量綱的粒度分布數(shù)據(jù),并可由分布結(jié)果計(jì)算出如Dv50等其它參數(shù)。篩分滶要特點(diǎn)是測(cè)量成本低廉,操作簡(jiǎn)單,但存在著如重復(fù)性差,測(cè)量時(shí)間較長(zhǎng),不能對(duì)5um以下的顆粒進(jìn)行測(cè)量等缺點(diǎn)。 ▲顯微圖像分析法 利用光學(xué)或電子顯微鏡及計(jì)算機(jī)圖像識(shí)別技術(shù)對(duì)顆粒粒度及粒度分布,顆粒形貌進(jìn)行測(cè)量,分析的方法。這種方法不僅能夠測(cè)量粒度分布而且能夠直接觀察到顆粒的形狀,是目前唯yi的一種可目視的直觀測(cè)試方法,這種特點(diǎn)也是其它粒度測(cè)量?jī)x器所不具備。這種方法的優(yōu)點(diǎn)是直觀、簡(jiǎn)便、費(fèi)用低,缺點(diǎn)是由于取樣量很少,為使測(cè)量結(jié)果代表性,必須增加待測(cè)顆粒的個(gè)數(shù)(一般認(rèn)為測(cè)量顆粒的個(gè)數(shù)應(yīng)在1000個(gè)以上),這就相應(yīng)嗇了測(cè)量時(shí)間,及測(cè)試人員的工作強(qiáng)度,但由于能夠?qū)︻w粒形貌(如長(zhǎng)徑比等)進(jìn)行測(cè)量,目前也有廣泛應(yīng)用。 ▲光透沉降法 沉降法粒度測(cè)試的理論基礎(chǔ)是斯托克司定律和比爾定律。前者給出顆粒沉降速度與粒徑的關(guān)系,后者闡明光透過(guò)率與粒徑重量的關(guān)系??珊?jiǎn)單的描述為:在沉降液中,有若干相同比重的顆粒,如果同一時(shí)刻,從同一位置開始下降,則不同直徑的顆粒到達(dá)測(cè)量區(qū)的時(shí)間是不同的,根據(jù)顆粒到達(dá)測(cè)量區(qū)的時(shí)間,及光強(qiáng)的強(qiáng)弱,就可以計(jì)算出顆粒的粒徑,及相應(yīng)粒徑的顆粒在顆粒群中占有的比例。采用此種原理的測(cè)量?jī)x器有比較長(zhǎng)的使用歷史,但隨著科技的發(fā)展和測(cè)量手段的進(jìn)步,此方法的缺點(diǎn)也日益突出,如測(cè)量時(shí)間長(zhǎng),重復(fù)性誤差大等。 ▲ 激光散射法 顆粒測(cè)量?jī)x器是以富朗和菲衍射(Fraunhofer diffraction)和米氏散射(Mie scattering)為理論基礎(chǔ)。此理論可以簡(jiǎn)單理解為沿直線傳播的平行激光束,在傳播過(guò)程中遇到顆粒的遮擋后,傳播方向發(fā)生了改變(即發(fā)生了衍射和散射現(xiàn)象),并且大顆粒使激光改變的角度小,小顆粒改變大。(實(shí)際上是由于顆粒的遮擋在無(wú)限遠(yuǎn)處形成了一個(gè)愛(ài)里斑,愛(ài)里斑87%的能量集中在ZX亮環(huán),且顆粒直徑越大,ZX環(huán)越小,顆粒直徑越小ZX亮環(huán)越大)。如果能在不同角度上接收光能, 對(duì)于相應(yīng)的的角度,其光能是對(duì)應(yīng)直徑的顆粒集合發(fā)生衍射(散射)造成的,相應(yīng)其他角度上光能的強(qiáng)弱也就反應(yīng)了對(duì)應(yīng)直徑顆粒在整個(gè)顆粒集合中占有的比例。 ▲ 采用激光粒度測(cè)量?jī)x器相對(duì)于光透沉降粒度測(cè)量?jī)x器具有很多優(yōu)點(diǎn): 1. 原理先進(jìn),并且由于測(cè)試過(guò)程中沒(méi)有需要預(yù)先設(shè)定的參數(shù)(如樣品比重、介質(zhì)黏度、環(huán)境溫度等),及在測(cè)量過(guò)程中隨時(shí)改變的條件, 因此測(cè)量結(jié)果準(zhǔn)確、可靠。 2. 測(cè)量速度快,測(cè)試時(shí)間與樣品粒度分布無(wú)關(guān),典型測(cè)試過(guò)程一般小于一分鐘; 3. 每次測(cè)試,多次對(duì)樣品進(jìn)行掃描,測(cè)試結(jié)果重復(fù)性好; 4. 進(jìn)樣方式種類多,可適用于各種類樣品。 展開
2016-03-07 05:37:01
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2009-03-24 08:44:57
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- 血細(xì)胞分析報(bào)告單參數(shù)報(bào)警結(jié)果參考范圍WBC白細(xì)胞數(shù)目4.9*10^9/L4.0-10.0LYMPH#淋巴細(xì)胞數(shù)目1.0*10^9/L0.6-4.1MID#中間細(xì)胞數(shù)目0.0*10^9/L0.1-1.8GRAN#中性粒細(xì)胞數(shù)目L3.9*10^9/L2.0-7... 血細(xì)胞分析報(bào)告單 參數(shù) 報(bào)警 結(jié)果 參考范圍 WBC白細(xì)胞數(shù)目 4.9*10^9/L 4.0-10.0 LYMPH#淋巴細(xì)胞數(shù)目 1.0*10^9/L 0.6-4.1 MID#中間細(xì)胞數(shù)目 0.0*10^9/L 0.1-1.8 GRAN#中性粒細(xì)胞數(shù)目 L 3.9*10^9/L 2.0-7.8 LYMPH%淋巴細(xì)胞百分比 21.4% 20.0-40.0 MID%中間細(xì)胞百分比 1.9% 1.0-15.0 GRAN%中性粒細(xì)胞百分比 H 76.7% 50.0-70.0 HGB血紅蛋白 141g/L 110-160 RBC紅細(xì)胞數(shù)目 5.04*10^12/L 3.50-5.50 HCT紅細(xì)胞壓積 H 52.0% 36.0-48.0 MCV平均紅細(xì)胞體積 H 103.3fL 80.0-99.0 MCH平均紅細(xì)胞血紅蛋白含量 27.9 26.0-35.0 MCHC平均紅細(xì)胞血紅蛋白濃度 L 271 300-380 RDW-CV紅細(xì)胞分布寬度變異系數(shù) 12.0% 11.5-14.5 RDW-SD紅細(xì)胞分布寬度標(biāo)準(zhǔn)差 49.5 35.0-56.0 PLT血小板數(shù)目 256*10^9 100-300 MPV平均血小板體積 8.2 7.4-10.4 PDW血小板分布寬度 H 17.5 15.0-17.0 PCT血小板壓積 0.209% 0.108-0.282 醫(yī)院醫(yī)生說(shuō)我有點(diǎn)感冒,但是我沒(méi)有感冒的癥狀。有時(shí)候坐著就算慢慢地站起來(lái)也會(huì)眼前發(fā)黑,腦袋有充血的感覺(jué),眼前黑幾分鐘,覺(jué)得是貧血,但是醫(yī)生說(shuō)沒(méi)有貧血(請(qǐng)幫忙判斷一下)。還有我的指甲貼肉的部分異常紅,家里人的指甲貼肉部分都是偏白的,不知道這是什么原因(請(qǐng)解釋一下有沒(méi)有什么問(wèn)題)。然后手腳總是冰冷的,有時(shí)候嘗試捂熱,但是捂不很熱,還出汗(請(qǐng)解釋一下這是什么原因)。謝謝! 展開
2013-02-20 02:54:45
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