| 查看: 1540 | 回复: 8 | |||
| 本帖产生 1 个 翻译EPI ，点击这里进行查看 | |||
| 当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖 | |||
[交流]
求翻译 各位兄弟姐妹谢谢啦
|
|||
|
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 ] |
回复此楼» 猜你喜欢
售SCI文章，我:8O.5.5.1O.54,科目全,可十急
已经有4人回复
-
售SCI一区T0P文章，我:8.O.55.1.O54,科目全,可伽急
已经有4人回复
-
售SCI一区文章，我:8.O.55.1.O.54,科目齐全,可伽急
已经有4人回复
-
售SCI一区T0P文章，我:8.O.55.1.O.54,科目齐全,可+急
已经有4人回复
-
售SCI-T0P文章，我:8O.5.5.1.O.54,科目齐全,可+急
已经有3人回复
-
售SCI文章，我:8O.5.5.1O.54,科目全,可十急
已经有3人回复
-
售一区SCI文章T0P，我:8O.551.O54,科目全,可十急
已经有3人回复
-
售SCI文章，我:8O5.5.1.O.54,科目齐全,可+急
已经有4人回复
-
售SCI文章，我:8O5.5.1.O.54,科目齐全,可+急
已经有3人回复
-
售SCI一区T0P文章，我:8.O.55.1.O54,科目全,可伽急
已经有3人回复
» 抢金币啦！回帖就可以得到:
-
2026年材料结构与力学性能国际会议（MSMP 2026
+1/819
-
2026年物理学、化学与数据分析国际会议 (PCDA 2026)
+1/812
-
专利代理人
+1/96
-
北京计算科学研究中心半导体计算模拟方向招收推免/硕博/博后
+1/87
-
南科大薛亚辉课题组诚聘离子输运、二维材料、原子力显微镜等方向“快响行动”博士生
+1/70
-
中国科大-合肥国家实验室冷原子量子网络团队招聘启事
+2/68
-
南方科技大学力航系急招收纳米材料、力学、机械等方向推免硕士研究生两名
+1/64
-
急招哈尔滨工业大学（深圳）机械学科2027级"申请-考核"博士研究生1名
+1/41
-
华南师范大学胡勇军教授课题组招收2027年推荐面试攻读研究生（推免生）
+1/35
-
浙江理工大学2027年硕士研究生招生简章
+1/10
-
浙江海洋大学2027年硕士研究生招生专业目录及自命题科目考试大纲
+1/7
-
为多肽行业添砖加瓦；新课题组首肽免费合成
+1/6
-
哈工大（深圳）赵院士近期招收能动、低空和碳中和博士生
+1/4
-
【2027硕士招生】招收材料、化工、环境、冶金类硕士研究生
+1/4
-
2027 International Conference on Logistics and Supply Chain Management
+1/4
-
哈工大（深圳）赵院士近期招收能动、低空和碳中和博士生
+1/3
-
中科院动物所招收2027年联合培养博士生（北京；有机化学或生命科学背景）
+1/2
-
2027 International Conference on Healthcare, Medicine and Medical Science
+1/1
-
哈工大（深圳）赵院士近期招收能动、低空和碳中和博士生
+1/1
-
浙江大学Kemal Celebi教授课题组招收2027年秋季博士生-材料/化学/化工
+1/1
4楼2011-03-21 17:58:55
syy311(金币+2, 翻译EPI+1): 继续努力哦 后续跟上啊，谢谢哦 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). 尽管我们不是第一个给出HAS的定义的，但是我们确是最先阐明HAS限制铝的生物学效应的机制的。我们尽力去了解关于HAS的无机化学特性以及他们在铝的生化循环中的重要作用。经过努力，我们发现了硅酸化学这个非常罕见的例子并能够对其进行完整的描述。 |
2楼2011-03-21 17:54:17
3楼2011-03-21 17:55:25
5楼2011-03-21 19:32:39
