Hasil untuk "physics.class-ph"

L. Schneider, A. Korber, S. Grabbe et al.

D. Evans, G. Pye, R. Bramley et al.

S. Sauvé, W. Hendershot, H. Allen

H. Fang, Hong Liu

J. Llopis, J. Mccaffery, Atsushi Miyawaki et al.

K. Emerson, R. Russo, R. Lund et al.

L. Gerweck, K. Seetharaman

M. Koivusalo, Christopher M. Welch, H. Hayashi et al.

Inhibitors of Na+/H+ exchange proteins block macropinocytosis by lowering the pH near the plasma membrane, which in turn inhibits actin remodeling by Rho family GTPases.

O. Husson

BackgroundOxidation-reduction and acid–base reactions are essential for the maintenance of all living organisms. However, redox potential (Eh) has received little attention in agronomy, unlike pH, which is regarded as a master variable. Agronomists are probably depriving themselves of a key factor in crop and soil science which could be a useful integrative tool.ScopeThis paper reviews the existing literature on Eh in various disciplines connected to agronomy, whether associated or not with pH, and then integrates this knowledge within a composite framework.ConclusionsThis transdisciplinary review offers evidence that Eh and pH are respectively and jointly major drivers of soil/plant/microorganism systems. Information on the roles of Eh and pH in plant and microorganism physiology and in soil genesis converges to form an operational framework for further studies of soil/plant/microorganism functioning. This framework is based on the hypothesis that plants physiologically function within a specific internal Eh-pH range and that, along with microorganisms, they alter Eh and pH in the rhizosphere to ensure homeostasis at the cell level. This new perspective could help in bridging several disciplines related to agronomy, and across micro and macro-scales. It should help to improve cropping systems design and management, in conventional, organic, and conservation agriculture.

Chunyi Sun, C. Qin, Xinlong Wang et al.

M. McCulloch, J. Falter, J. Trotter et al.

M. H. Lee, Nayoung Park, C. Yi et al.

We report here a mitochondria-targetable pH-sensitive probe that allows for a quantitative measurement of mitochondrial pH changes, as well as the real-time monitoring of pH-related physiological effects in live cells. This system consists of a piperazine-linked naphthalimide as a fluorescence off–on signaling unit, a cationic triphenylphosphonium group for mitochondrial targeting, and a reactive benzyl chloride subunit for mitochondrial fixation. It operates well in a mitochondrial environment within whole cells and displays a desirable off–on fluorescence response to mitochondrial acidification. Moreover, this probe allows for the monitoring of impaired mitochondria undergoing mitophagic elimination as the result of nutrient starvation. It thus allows for the monitoring of the organelle-specific dynamics associated with the conversion between physiological and pathological states.

D V Redžić

The complex relationship between Einstein's second postulate and the Maxwell electromagnetic theory is elucidated. A simple deduction of the main results of the Ignatowski approach to the theory of relativity is given. The peculiar status of the principle of relativity among the Maxwellians is illustrated.

Han-Ni Liang, Chuan-he Tang

Jinbo Shen, Yonglun Zeng, X. Zhuang et al.

A. Idili, A. Vallée‐Bélisle, F. Ricci

Takayuki Yoshida, T. C. Lai, G. Kwon et al.

Tomás Guinovart, G. Valdés-Ramírez, J. Windmiller et al.

C. Yoshida, V. B. Maciel, M.E.V. Mendonça et al.

Xinpeng Ma, Yiguang Wang, Tian Zhao et al.

pH is an important physiological parameter that plays a critical role in cellular and tissue homeostasis. Conventional small molecular pH sensors (e.g., fluorescein, Lysosensor) are limited by broad pH response and restricted fluorescent emissions. Previously, we reported the development of ultra-pH-sensitive (UPS) nanoprobes with sharp pH response using fluorophores with small Stokes shifts (50-fold between on and off states). The UPS library provides a useful toolkit to study pH regulation in many pathophysiological indications (e.g., cancer, lysosome catabolism) as well as establishing tumor-activatable systems for cancer imaging and drug delivery.