 |
 |
 |
 |
 |
 |
||
 |
 |
 |
 |
 |
| 3 | 1/1 | 返回列表 |
| 查看: 839 | 回復: 2 | |||
huyueming321銅蟲 (小有名氣)
|
[求助]
高水分含量下微生物更容易殺死的原因 已有1人參與
|
|
微生物在水分活度越低越難殺死，求談?wù)撨@方面的原因？是不是高水分含量下微生物更容易殺死？熱處理時 我在文獻中有看到低水分時滲透壓使微生物迅速失水體積變小，然后細胞膜變厚，膜通透性和流動性降低。熱處理時跟這些變化有關(guān)系嗎，這樣對不對？大家有其他解釋嗎或者文獻？ The protection of the microbial cells at low water activity can be mainly due to the osmotic pressure that induced rapid water loss from the cell. Thus result in cell shrinkage, which probably causes a thickening in the cell membrane, followed by reduced membrane permeability and fluidity, and the increase of water activity will result an opposite effect.這是我寫的原文，大家看合不合適？ |
回復此樓» 猜你喜歡
085601材料工程找調(diào)劑
已經(jīng)有11人回復
-
總分293求調(diào)劑
已經(jīng)有9人回復
-
334分 一志愿武理 材料求調(diào)劑
已經(jīng)有5人回復
-
327求調(diào)劑
已經(jīng)有6人回復
-
329求調(diào)劑
已經(jīng)有10人回復
-
275求調(diào)劑
已經(jīng)有15人回復
-
291求調(diào)劑
已經(jīng)有6人回復
-
309求調(diào)劑
已經(jīng)有7人回復
-
297求調(diào)劑
已經(jīng)有11人回復
-
一志愿南航 335分 | 0856 | GPA 4.07 | 有科研經(jīng)歷
已經(jīng)有6人回復
» 本主題相關(guān)價值貼推薦，對您同樣有幫助:
- 請問紫外殺菌只是殺死物體表面的菌嗎？會不會殺死塑料袋或紙片里面的菌？謝謝！
已經(jīng)有4人回復
- 乳清粉蛋白含量高，如何滅菌？
已經(jīng)有8人回復
- 怎樣殺死土壤中的所有微生物又不破壞土壤結(jié)構(gòu)
已經(jīng)有17人回復
- 求助求助！我想用非水滴定法測定總生物堿含量，如何標定高氯酸呢？？
已經(jīng)有7人回復
- EPS 非絲狀菌 生物泡沫
已經(jīng)有15人回復
- 熟黃豆粉與生黃豆粉哪個更容易產(chǎn)泡沫？
已經(jīng)有3人回復
- 厭氧生物處理能處理高濃度的廢水，而好氧處理只能處理中低濃度的廢水？
已經(jīng)有9人回復
【答案】應助回帖
★ ★ ★ ★ ★
感謝參與，應助指數(shù) +1
huyueming321: 金幣+5, ★有幫助 2015-06-24 14:55:53
感謝參與，應助指數(shù) +1
huyueming321: 金幣+5, ★有幫助 2015-06-24 14:55:53
|
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC238580/ Title: Survival of Bacteria and Fungi in Relation to Water Activity and the Solvent Properties of Water in Biopolymer Gels Survival of bacteria (Rhizobium, Agrobacterium, and Arthrobacter spp.), fungal spores (Penicillium sp.), and yeasts (Saccharomyces sp.) was studied in relation to water activity (aw) and the presence of nutritive solutes. The cells were entrapped in polysaccharide gels, as is done to immobilize cells or enzymes, and then dehydrated. The number of living cells (1010 g of dry polymer−1) remained constant for periods of storage of >3 years at 28°C when the inocula were kept at an aw of <0.069. At aw values between 0.069 and 0.83 the number of survivors diminished more and more rapidly as the aw was raised. For a given aw and organism, there were large differences in survival rate as a function of the nutritive solutes used to culture the microorganisms. Low-molecular-weight compounds (with three or five carbon atoms) had a deleterious effect on survival, whereas compounds of higher molecular weight (C6 to C12) had a protecting effect. Thus, the aw alone was not a sufficient explanation for the deterioration of the inocula. Survival seemed to be more directly related to some properties of the water in the biopolymer. New concepts such as the discontinuity of properties of water and the point of mobilization of solutes, already proposed by Duckworth and Kelly (J. Food Technol. 8:105-113, 1973) and Seow (J. Sci. Food Agric., 26:535-536, 1975), have been taken into consideration to explain the interactions of water with the biopolymer and their specific effects on the microorganisms. |
2樓2015-06-23 11:29:48
3樓2017-12-03 13:29:51
相關(guān)版塊跳轉(zhuǎn)
我要訂閱樓主 huyueming321 的主題更新
| 3 | 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] 一志愿南航 335分 | 0856 | GPA 4.07 | 有科研經(jīng)歷 +6 | cccchenso 2026-03-29 | 6/300 |
|
|---|---|---|---|---|
|
[考研] 352分-085602-一志愿985 +5 | 海納百川Ly 2026-03-29 | 5/250 |
|
|
|
[考研] 330分求調(diào)劑 +5 | qzenlc 2026-03-29 | 5/250 |
|
|
|
[考研] 0703 化學 求調(diào)劑，一志愿山東大學 342 分 +4 | Shern—- 2026-03-28 | 4/200 |
|
|
|
[考研] 343求調(diào)劑 +5 | 愛羈絆 2026-03-28 | 5/250 |
|
|
|
[考研] 071000生物學求調(diào)劑，初試成績343 +7 | 小小甜面團 2026-03-25 | 7/350 |
|
|
|
[考研] 材料與化工272求調(diào)劑 +9 | 阿斯蒂芬2004 2026-03-28 | 9/450 |
|
|
|
[考研] 一志愿北京工業(yè)大學，324分求調(diào)劑 +4 | 零八# 2026-03-28 | 4/200 |
|
|
|
[考研] 材料求調(diào)劑一志愿哈工大324 +7 | 閆旭東 2026-03-28 | 9/450 |
|
|
|
[考研]
 材料與化工考研調(diào)劑
+17
|
孅華 2026-03-22 | 17/850 |
|
|
|
[考研] 286求調(diào)劑 +4 | 丟掉懶惰 2026-03-27 | 7/350 |
|
|
|
[考研] 求調(diào)劑推薦 材料 304 +15 | 荷包蛋hyj 2026-03-26 | 15/750 |
|
|
|
[考研] 086000調(diào)劑 +3 | 7901117076 2026-03-26 | 3/150 |
|
|
|
[考研] 生物學 296 求調(diào)劑 +4 | 朵朵- 2026-03-26 | 6/300 |
|
|
|
[考研] 281求調(diào)劑 +6 | Koxui 2026-03-24 | 7/350 |
|
|
|
[考研] 26考研-291分-廈門大學（085601）-柔性電子學院材料工程專業(yè)求調(diào)劑 +3 | min3 2026-03-24 | 4/200 |
|
|
|
[考研] 0854AI CV方向招收調(diào)劑 +4 | 章小魚567 2026-03-23 | 4/200 |
|
|
|
[有機交流]
有機合成求助
 20+3
|
FENGSHUJEI 2026-03-23 | 5/250 |
|
|
|
[考研] 一志愿南航材料專317分求調(diào)劑 +5 | 炸呀炸呀炸薯條 2026-03-23 | 5/250 |
|
|
|
[考研] 292求調(diào)劑 +4 | 鵝鵝鵝額額額額?/a> 2026-03-24 | 4/200 |
|