 |
 |
 |
 |
 |
 |
||
 |
 |
 |
 |
 |
| 9 | 1/1 | 返回列表 |
| 查看: 1199 | 回復(fù): 8 | |||
| 本帖產(chǎn)生 1 個 翻譯EPI ，點擊這里進行查看 | |||
[交流]
求翻譯 各位兄弟姐妹謝謝啦
|
|||
|
While we were not the ?rst to coin the term hydroxyalu-minosilicate (HAS), we were the ?rst to demonstrate that the formation of HAS limited the biological availability of aluminum (1). We have since strived to understand as much as we can about the inorganic chemistry of HAS and their role in the biogeochemical cycle of aluminum (2, 3)and through our efforts we have provided a full description of one of the very few examples of the chemistry of silicic acid (4). The latter, in undersaturated solutions (<2.0 mmol/L) at pH below ca 10 is a neutral monomer of which the only known chemistry is (i) with ammonium molybdate to form the Keggin-like molybdosilicic acid complex (the basis for the spectrophotometric measurement of silicic acid) and (ii) with aluminum hydroxide to form HAS. The latter has been shown by us to proceed by a competitive condensation reaction at an hydroxyaluminum surface (4). In a recent paper in Environmental Science & Technology (5) the authors have used the term HAS but they have ascribed their role in limiting the biological availability of aluminum to an alternative reaction pathway involving the reaction of aluminum with polysilicic acids. Many metal cations are chelated by poly-silicic acids (6) and the chemistry is completely different from that of the formation of HAS. The authors should recognize that using the term HAS to describe the products of the reaction of aluminum with polymeric silicic acids is potentially confusing and misleading. In the same paper evidence is presented to support the detoxi?cation of aluminum in the digestive gland in snails by its intralysosomal binding by polymeric silicic acid. The suggestion seems to be that freshwater snails are natural biosilici?ers, capturing silicic acid and concentrating it in lysosomes prior to its deposition as amorphous silica. That freshwater snails deposit amorphous silica is an intriguing suggestion but not one, to my knowledge, that has been supported by experiment or observation. In addition, for such a mechanism to account for the detoxi?cation of aluminum there would need to be a further mechanism for the uptake of aluminum into lysosomes which were actively scavenging and concentrating silicic acid. Again, Occam’s razor would suggest that no such mechanism exists. The limited support provided for such a mechanism in this paper is analyses of a single inorganic particle isolated from a digestive gland of a snail exposed to aluminum. The analyses are qualitative and distinct from other similar analyses published by members of the same research group (7–9)in that there is no evidence of any sulfur. Energy dispersive X-ray spectrometry (EDX) suggested an excess of silicon over aluminum while electron energy loss spectrometry (EELS) showed some similarity with synthetic protoimogolite. There is a simple explanation for this observation. The aggregate in question is a phytolith (amorphous silica of plant/algal origin) which probably originated from the diet of the snail, and upon which are adsorbed HAS. The latter, since aluminum was present in excess of silicic acid in the culture solution, was probably HASA (or protoimogolite) in which the ratio of Si:Al would be ca 0.5 (10), an observation supported by EELS, and could have formed either in the external solution or, conceivably at least, in the digestive gland itself. I am at odds to understand why the authors have chosen to expound a mechanism of detoxi?cation of aluminum in the snail for which there is not, as yet, any scienti?c basis. The authors have shown quite clearly that aluminum is a neurotoxin in the snail and that the toxicity can be alleviated by silicic acid. Upon the basis of the science to-date the mechanism of amelioration is likely to be the same as that described in other biota, which is through the formation of HAS. [ Last edited by syy311 on 2011-3-21 at 16:44 ] |
回復(fù)此樓» 猜你喜歡
本人考085602 化學(xué)工程 專碩
已經(jīng)有23人回復(fù)
-
求調(diào)劑院校信息
已經(jīng)有4人回復(fù)
-
085600材料與化工306
已經(jīng)有4人回復(fù)
-
286求調(diào)劑
已經(jīng)有10人回復(fù)
-
328求調(diào)劑，英語六級551，有科研經(jīng)歷
已經(jīng)有9人回復(fù)
-
一志愿北京化工大學(xué)070300 學(xué)碩336求調(diào)劑
已經(jīng)有4人回復(fù)
-
286分人工智能專業(yè)請求調(diào)劑愿意跨考！
已經(jīng)有8人回復(fù)
-
資源與環(huán)境 調(diào)劑申請(333分)
已經(jīng)有5人回復(fù)
-
280求調(diào)劑
已經(jīng)有12人回復(fù)
-
269專碩求調(diào)劑
已經(jīng)有5人回復(fù)
» 搶金幣啦！回帖就可以得到:
-
青島高校2026招生碩士研究生
+5/770
-
本子終于提交了。不用再看了，一切閑下來慢慢等。希望一切順利！
+1/639
-
持續(xù)創(chuàng)業(yè)者，A8離異男征婚，事業(yè)遇到瓶頸，尋找創(chuàng)業(yè)生活伴侶
+1/461
-
紹興大學(xué)博士教師招聘1位（化學(xué)化工相關(guān)）
+5/290
-
愿遇見你，遇見不止擦肩而過的緣分
+1/74
-
坐標廣州，男征女，雙向奔赴
+1/66
-
Alicat 層流壓差質(zhì)量流量控制器在新型硅碳負極流化床的應(yīng)用- 艾里卡特（Alicat）
+3/52
-
飄在美國，有點想家
+1/51
-
上海交通大學(xué)沈道智副教授招收2026年聯(lián)培博士/碩士研究生（微納器件與制造方向）
+1/33
-
招收熒光探針/有機合成/生物學(xué) 博士后--薪金: 30萬-50萬
+1/33
-
西安某大學(xué)能源化工新材料研發(fā)項目組接收2026級調(diào)劑研究生-計算機類
+1/32
-
研究生 調(diào)劑 看過來- 機械、控制工程、力學(xué)類（流體力學(xué)、一般力學(xué)等） 211 雙一流
+1/28
-
招聘科研助理——儲能方向（儲能、流體傳熱、CFD模擬）
+1/17
-
湖南大學(xué)微生物結(jié)構(gòu)與功能實驗室2026年計劃招收博士研究生
+1/14
-
北京某研究院生物化學(xué)與分子生物學(xué)相關(guān)專業(yè)申請考核制博士招生（春季）
+1/11
-
寧波東方理工大學(xué)余鵬課題組2026年上海交大聯(lián)培博士生、博士后、科研助理招聘
+1/7
-
湖北大學(xué)材料學(xué)招26級碩士研究生若干名
+1/6
-
南京林業(yè)大學(xué)化學(xué)工程學(xué)院柏惺峰課題組招收2026年申請考核制博士2名
+1/4
-
211/雙一流石河子大學(xué)化學(xué)化工學(xué)院--電催化，CO2轉(zhuǎn)化
+1/3
-
中科院上海微系統(tǒng)所材料生長理論與仿真課題組-博士后招聘（材料計算與AI4S）
+1/1
Mally89
鐵桿木蟲 (職業(yè)作家)
- 翻譯EPI: 79
- 應(yīng)助: 7 (幼兒園)
- 貴賓: 1.257
- 金幣: 5347.3
- 帖子: 3712
- 在線: 1225.5小時
- 蟲號: 1150928
syy311(金幣+2, 翻譯EPI+1): 繼續(xù)努力哦 后續(xù)跟上啊，謝謝哦 2011-03-21 19:33:58
|
While we were not the ?rst to coin the term hydroxyalu-minosilicate (HAS), we were the ?rst to demonstrate that the formation of HAS limited the biological availability of aluminum (1). We have since strived to understand as much as we can about the inorganic chemistry of HAS and their role in the biogeochemical cycle of aluminum (2, 3)and through our efforts we have provided a full description of one of the very few examples of the chemistry of silicic acid (4). 盡管我們不是第一個給出HAS的定義的，但是我們確是最先闡明HAS限制鋁的生物學(xué)效應(yīng)的機制的。我們盡力去了解關(guān)于HAS的無機化學(xué)特性以及他們在鋁的生化循環(huán)中的重要作用。經(jīng)過努力，我們發(fā)現(xiàn)了硅酸化學(xué)這個非常罕見的例子并能夠?qū)ζ溥M行完整的描述。 |
2樓2011-03-21 17:54:17
Mally89
鐵桿木蟲 (職業(yè)作家)
- 翻譯EPI: 79
- 應(yīng)助: 7 (幼兒園)
- 貴賓: 1.257
- 金幣: 5347.3
- 帖子: 3712
- 在線: 1225.5小時
- 蟲號: 1150928
3樓2011-03-21 17:55:25
4樓2011-03-21 17:58:55
5樓2011-03-21 19:32:39
6樓2011-03-21 20:22:27
7樓2011-03-22 17:02:08
8樓2011-03-22 17:13:32
Mally89
鐵桿木蟲 (職業(yè)作家)
- 翻譯EPI: 79
- 應(yīng)助: 7 (幼兒園)
- 貴賓: 1.257
- 金幣: 5347.3
- 帖子: 3712
- 在線: 1225.5小時
- 蟲號: 1150928
syy311(金幣+1): 加油哦 呵呵 2011-03-23 14:22:07
|
The latter, in undersaturated solutions (<2.0 mmol/L) at pH below ca 10 is a neutral monomer of which the only known chemistry is (i) with ammonium molybdate to form the Keggin-like molybdosilicic acid complex (the basis for the spectrophotometric measurement of silicic acid) and (ii) with aluminum hydroxide to form HAS. The latter has been shown by us to proceed by a competitive condensation reaction at an hydroxyaluminum surface (4). 對于后者，在這個不飽和的溶液中（<2.0 mmol/L），且其pH值低于約10時，表現(xiàn)為一個中性的單體，這個單體有一已知化學(xué)性質(zhì)，就是與鉬酸銨形成的類鋁的硅鉬酸復(fù)合物（依據(jù)硅酸的分光光度值）及（II）從而與氫氧化鋁形成了HAS。后者已被我們證明是由一個羥基鋁的表面發(fā)生的競爭縮合反應(yīng)所形成的。（4） |
9樓2011-03-22 20:54:20
相關(guān)版塊跳轉(zhuǎn)
我要訂閱樓主 syy311 的主題更新
| 9 | 1/1 | 返回列表 |
| 最具人氣熱帖推薦 [查看全部] | 作者 | 回/看 | 最后發(fā)表 | |
|---|---|---|---|---|
|
[考研] 269專碩求調(diào)劑 +5 | 金恩貝 2026-03-21 | 5/250 |
|
|---|---|---|---|---|
|
[考研] 材料學(xué)碩301分求調(diào)劑 +7 | Liyouyumairs 2026-03-21 | 7/350 |
|
|
|
[考研] 326求調(diào)劑 +5 | 諾貝爾化學(xué)獎覬?/a> 2026-03-15 | 8/400 |
|
|
|
[考研] 考研化學(xué)學(xué)碩調(diào)劑，一志愿985 +5 | 張vvvv 2026-03-15 | 7/350 |
|
|
|
[考研] 297求調(diào)劑 +3 | 喜歡還是不甘心 2026-03-20 | 3/150 |
|
|
|
[考研] 279分求調(diào)劑 一志愿211 +14 | chaojifeixia 2026-03-19 | 15/750 |
|
|
|
[考研] 求調(diào)劑 +3 | 白QF 2026-03-21 | 3/150 |
|
|
|
[考研] 求調(diào)劑 +6 | Mqqqqqq 2026-03-19 | 6/300 |
|
|
|
[考研] 二本跨考鄭大材料306英一數(shù)二 +3 | z1z2z3879 2026-03-17 | 3/150 |
|
|
|
[考研] 296求調(diào)劑 +6 | www_q 2026-03-18 | 10/500 |
|
|
|
[考研] 287求調(diào)劑 +7 | 晨昏線與星海 2026-03-19 | 8/400 |
|
|
|
[考研] 一志愿 西北大學(xué) ，070300化學(xué)學(xué)碩，總分287，雙非一本，求調(diào)劑。 +4 | 晨昏線與星海 2026-03-19 | 4/200 |
|
|
|
[考研] 一志愿華中農(nóng)業(yè)071010，總分320求調(diào)劑 +3 | 困困困困坤坤 2026-03-20 | 3/150 |
|
|
|
[考研] 081700化工學(xué)碩調(diào)劑 +3 | 【1】 2026-03-16 | 3/150 |
|
|
|
[考研] 【同濟軟件】軟件（085405）考研求調(diào)劑 +3 | 2026eternal 2026-03-18 | 3/150 |
|
|
|
[考研] 301求調(diào)劑 +4 | A_JiXing 2026-03-16 | 4/200 |
|
|
|
[考研] 326求調(diào)劑 +5 | 上岸的小葡 2026-03-15 | 6/300 |
|
|
|
[碩博家園] 湖北工業(yè)大學(xué) 生命科學(xué)與健康學(xué)院-課題組招收2026級食品/生物方向碩士 +3 | 1喜春8 2026-03-17 | 5/250 |
|
|
|
[考研] 機械專碩325，尋找調(diào)劑院校 +3 | y9999 2026-03-15 | 5/250 |
|
|
|
[考研] 070303 總分349求調(diào)劑 +3 | LJY9966 2026-03-15 | 5/250 |
|