Rhizosphere pH Gradient Controls Copper Availability in a Strongly Acidic Soil

2009 ◽  
Vol 43 (15) ◽  
pp. 5686-5691 ◽  
Author(s):  
M. N. Bravin ◽  
P. Tentscher ◽  
J. Rose ◽  
P. Hinsinger
Keyword(s):  
Acidic Soil ◽  
Ph Gradient ◽  
Rhizosphere Ph ◽  
Copper Availability

Kinetics of Phosphate Rock Dissolution in Acidic Soil Amended with Liming Materials and Cellulose

1996 ◽  
Vol 60 (6) ◽  
pp. 1589-1595 ◽  
Author(s):  
Z. L. He ◽  
V. C. Baligar ◽  
K. D. Ritchey ◽  
D. C. Martens ◽  
W. D. Kemper
Keyword(s):  
Phosphate Rock ◽  
Acidic Soil ◽  
Phosphate Rock Dissolution ◽  
Kinetics Of

Improving Topical Skin Delivery of Monocrotaline Via Liposome Gel-based Nanosystems

2019 ◽  
Vol 16 (10) ◽  
pp. 940-950 ◽  
Author(s):  
Jiandong Yu ◽  
Zhi Chen ◽  
Yan-zhi Yin ◽  
Chaoyuan Tang ◽  
Enying Hu ◽  
...  
Keyword(s):  
Gradient Method ◽  
Encapsulation Efficiency ◽  
Ph Value ◽  
Topical Administration ◽  
Ph Gradient ◽  
Stability Factor ◽  
Buffer Solution ◽  
Skin Delivery ◽  
Skin Retention

Background: In this study, a liposomal gel based on a pH-gradient method was used to increase the skin-layer retention of monocrotaline (MCT) for topical administration. Methods: Using the Box-Behnken design, different formulations were designed to form liposome suspensions with optimal encapsulation efficiency (EE%) and stability factor (KE). In order to keep MCT in liposomes and accumulate in skin slowly and selectively, MCT liposome suspensions were engineered into gels. Results: A pH-gradient method was used to prepare liposome suspensions. The optimal formulation of liposome suspensions (encapsulation efficiency: 83.10 ± 0.21%) was as follows: MCT 12 mg, soybean phosphatidyl choline (sbPC) 200 mg, cholesterol (CH) 41 mg, vitamin E (VE) 5 mg, and citric acid buffer solution (CBS) 4.0 10 mL (pH 7.0). The final formulation of liposomal gels consisted of 32 mL liposome suspensions, 4.76 mL deionized water, 0.40 g Carbopol-940, 1.6 g glycerol, 0.04 g methylparaben, and a suitable amount of triethanolamine for pH value adjustment. The results of in vitro drug release showed that MCT in liposomal gels could be released in 12 h constantly in physiological saline as a Ritger-Peppas model. Compared with plain MCT in gel form, liposomal MCT in gel had higher skin retention in vitro. Conclusion: In this study, liposomal gels were formed for greater skin retention of MCT. It is potentially beneficial for reducing toxicities of MCT by topical administration with liposomal gel.

scholarly journals Vaginal, Cervical and Uterine pH in Women with Normal and Abnormal Vaginal Microbiota

Pathogens ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 90
Author(s):  
Malene Risager Lykke ◽  
Naja Becher ◽  
Thor Haahr ◽  
Ebbe Boedtkjer ◽  
Jørgen Skov Jensen ◽  
...  
Keyword(s):  
Pregnant Women ◽  
Genital Tract ◽  
Quantitative Polymerase Chain Reaction ◽  
Female Genital Tract ◽  
Uterine Cavity ◽  
Vaginal Microbiota ◽  
Reproductive Age ◽  
Ph Gradient ◽  
Increased Risk ◽  
Female Genital

Introduction: Healthy women of reproductive age have a vaginal pH around 4.5, whereas little is known about pH in the upper genital tract. A shift in the vaginal microbiota may result in an elevated pH in the upper genital tract. This might contribute to decreased fertility and increased risk of preterm birth. Therefore, we aimed to measure pH in different compartments of the female genital tract in both nonpregnant and pregnant women, stratifying into a normal and abnormal vaginal microbiota. Material and methods: In this descriptive study, we included 6 nonpregnant, 12 early-pregnant, and 8 term-pregnant women. A pH gradient was recorded with a flexible pH probe. An abnormal vaginal microbiota was diagnosed by a quantitative polymerase chain reaction technique for Atopobium vaginae; Sneathia sanguinegens; Leptotrichia amnionii; bacterial vaginosis-associated bacterium 1, 2, 3, and TM7; and Prevotella spp. among others. Results: In all participants we found the pH gradient in the lower reproductive canal to be most acidic in the lower vagina and most alkaline in the upper uterine cavity. Women with an abnormal vaginal microbiota had an increased pH in the lower vagina compared to the other groups. Conclusions: There is a pronounced pH gradient within the female genital tract. This gradient is not disrupted in women with an abnormal vaginal microbiota.

Immobilization of Cd and Pb in a contaminated acidic soil amended with hydroxyapatite, bentonite, and biochar

2021 ◽  
Author(s):  
Di Zhang ◽  
Aifang Ding ◽  
Ting Li ◽  
Xiaoxia Wu ◽  
Yanju Liu ◽  
...  
Keyword(s):  
Acidic Soil

Neutralization of acidic soil using Myxococcus xanthus: Important parameters and their implications

2021 ◽  
pp. 1-8
Author(s):  
MinJung Cho ◽  
SeonYeong Park ◽  
EunYoung You ◽  
ChangGyun Kim
Keyword(s):  
Myxococcus Xanthus ◽  
Acidic Soil

Effects of fertilisation on radionuclide uptake by maize from an acidic soil in northwestern Croatia

2021 ◽  
Vol 212 ◽  
pp. 105030
Author(s):  
Željka Zgorelec ◽  
Marko Šoštarić ◽  
Dinko Babić ◽  
Ivana Šestak ◽  
Milan Mesić ◽  
...  
Keyword(s):  
Acidic Soil ◽  
Radionuclide Uptake

scholarly journals Root excretion and plant tolerance to cadmium toxicity - a review

2008 ◽  
Vol 53 (No. 5) ◽  
pp. 193-200 ◽  
Author(s):  
J. Dong ◽  
W.H. Mao ◽  
G.P. Zhang ◽  
F.B. Wu ◽  
Y. Cai
Keyword(s):  
Root Exudates ◽  
Anthropogenic Activities ◽  
Cadmium Toxicity ◽  
Research Work ◽  
Future Research ◽  
Rhizosphere Ph ◽  
Plant Tolerance ◽  
Rhizosphere Environment ◽  
Safe Food ◽  
Tolerance To Cadmium

Significant quantities of Cd have been added to soils globally due to various anthropogenic activities, posing a serious threat to safe food production and human health. Rhizosphere, as an important interface of soil and plant, plays a significant role in the agro-environmental system. This article presents a review of relationship between root excretion and microorganisms and plant resistance to Cd toxicity and possible mechanisms. Root exudates markedly altered in species and quantity under Cd stress. Root exudates can affect Cd absorption by plants through changing the physical and chemical characteristics of rhizospheres. The influence of root exudates on Cd bioavailability and toxicity may include modifying the rhizosphere pH and Eh, chelating/complexing and depositing with Cd ions, and altering the community construction, the numbers and activities of rhizospheric microbes. In this paper, the methods to reduce the transfer of Cd in soil-plant system by adjusting rhizosphere environment are discussed, and some aspects are also proposed that should be emphasized in the future research work.

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