Utilising hardly-water soluble substrates as a second phase enables the straightforward synthesis of chiral alcohols

2011 ◽  
Vol 13 (11) ◽  
pp. 3093 ◽  
Author(s):  
Christina Kohlmann ◽  
Nora Robertz ◽  
Susanne Leuchs ◽  
Lasse Greiner ◽  
Shukralla Na’amnieh
Keyword(s):  
Water Soluble ◽  
Chiral Alcohols ◽  
Second Phase

scholarly journals Modern approaches to local treatment of pyo-necrotic complications of the diabetic foot syndrome

2012 ◽  
Vol 93 (2) ◽  
pp. 301-303
Author(s):  
L E Slavin ◽  
B N Godzhaev ◽  
A Z Zamaleev
Keyword(s):  
Wound Healing ◽  
Diabetic Foot ◽  
Healing Process ◽  
Local Treatment ◽  
Water Soluble ◽  
Diabetic Foot Syndrome ◽  
Layered System ◽  
Second Phase ◽  
Bathing Solution ◽  
Optimal Conditions

The analysis of publications devoted to modern methods of treatment of pyo-necrotic complications of diabetic foot syndrome has been presented. Identified were the most important principles of therapeutic tactics for this type of pathology. In order to create optimal conditions for wound healing after surgical sanitation local drug treatment is carried out - a thorough wound detersion with application of the isotonic sodium chloride solution or a neutral bathing solution, periodic (as needed) necrectomies, application of bandages, in accordance with the phase of wound healing process. The choice of medication for local treatment depends on the one hand on the type of lesion of the lower limbs, on the other - on the diabetes related morbidity and phase of wound healing. In the first phase of wound healing antiseptics are used: iodophors, polyhexanide (lavasept), hydroxymethyl quinoxaline dioxide (dioxidine), and in the absence of ischemia - compositions based on gelevine, water-soluble base ointments. In the second phase used were various wound covers based on collagen, as well as oil and hydrogel dressings. Ready-to-use bandages are also used, which are multi-layered system, comprised of a cellulose substrate, collagen, fibroblasts, growth factor, coated with plates of silicon to control humidity. The disadvantage of the ready-to-use dressings is the impossibility of controlling the wound on a daily basis. One of the trends in the treatment of chronic diabetic wounds is the use of living skin cells that serve as a source of growth factors, cytokines and other proteins that stimulate the healing process. The use of local immunomodulators is seen as promising. Treatment should be individualized and systemic antibiotic therapy is required. The main principle of local treatment is the creation of optimal conditions for accelerating the healing process.

scholarly journals Multiple sources of sn-1,2-diacylglycerol in platelet-derived-growth-factor-stimulated Swiss 3T3 fibroblasts. Evidence for activation of phosphoinositidase C and phosphatidylcholine-specific phospholipase D

1991 ◽  
Vol 279 (2) ◽  
pp. 559-565 ◽  
Author(s):  
R Plevin ◽  
S J Cook ◽  
S Palmer ◽  
M J O Wakelam
Keyword(s):  
Growth Factor ◽  
Phospholipase D ◽  
Lag Time ◽  
Water Soluble ◽  
Platelet Derived Growth Factor ◽  
Second Phase ◽  
Multiple Sources ◽  
3T3 Fibroblasts ◽  
Swiss 3T3 ◽  
Swiss 3T3 Fibroblasts

Platelet-derived growth factor (PDGF) stimulated sn-1,2-diacylglycerol (DAG) mass formation in Swiss 3T3 fibroblasts with a lag time of some 30 s. The response was biphasic, with the second phase being sustained over time. PDGF also stimulated the formation of Ins(1,4,5)P3 with a similar lag time to the DAG response, suggesting that DAG is derived from PtdIns(4,5)P2 hydrolysis at this time point. PDGF-stimulated phosphatidylcholine (PtdCho) hydrolysis in Swiss 3T3 fibroblasts, as measured by the formation of water-soluble choline metabolites and phosphatidylbutanol (PtdBut) accumulation, was by a phospholipase D (PLD)-catalysed pathway which was kinetically downstream of initial PtdIns(4,5)P2 hydrolysis. Accumulation of PtdBut increased up to 15 min, suggesting that PLD activity is not rapidly densitized in response to PDGF. The kinetics of PtdCho hydrolysis closely paralleled the second phase of DAG formation, strongly suggesting that during prolonged stimulation periods PtdCho is a major source of DAG in these cells. However, since PtdIns(4,5)P2 breakdown was also prolonged, PDGF-stimulated DAG may be derived from both phospholipids. Down-regulation of protein kinase C (PKC), by pre-treatment with phorbol 12-myristate 13-acetate, abolished both [3H]choline and [3H]PtdBut formation, suggesting that PLD-catalysed PtdCho hydrolysis may be dependent on PKC activation, supporting its dependence on prior PtdIns(4,5)P2 hydrolysis.

scholarly journals NP213 (Novexatin®): A unique therapy candidate for onychomycosis with a differentiated safety and efficacy profile

2020 ◽  
Vol 58 (8) ◽  
pp. 1064-1072 ◽  
Author(s):  
Derry K Mercer ◽  
Jennifer C Robertson ◽  
Lorna Miller ◽  
Colin S Stewart ◽  
Deborah A O'Neil
Keyword(s):  
Topical Treatment ◽  
Systemic Exposure ◽  
Water Soluble ◽  
Second Phase ◽  
Two Phase ◽  
Clinical Safety ◽  
Host Defense Peptides ◽  
Essential Components ◽  
Patient Reported ◽  
Unique Therapy

Abstract NP213 (Novexatin®) is a novel antifungal peptide specifically designed for the topical treatment of onychomycosis. NP213 was designed using host defense peptides (HDP), essential components of the innate immune response to infection, as a template. NP213 is a water-soluble cyclic fungicidal peptide that effectively penetrates human nail. NP213 demonstrated a promising preclinical and clinical safety profile, with no evidence of systemic exposure following topical application to the skin and nails. NP213 was efficacious in two phase IIa human trials with 43.3% of patients having no fungi detectable by culture of fragments from NP213-treated nails after 180 days in the first study and likewise 56.5% of patients were culture negative for dermatophytes after 360 days in the second phase IIa study. In both trials, NP213 was applied daily for only 28 days in marked contrast to other topical onychomycosis treatments that require application for up to 52 weeks. Patient reported outcomes from the phase IIa studies were positive with participants recording an improved appearance of their nails after only 14 days of application. All fungi identified in these studies were Trichophyton spp. NP213 (Novexatin®) is a promising, highly differentiated peptide-based candidate for the topical treatment of onychomycosis, addressing the infectious cause and cosmetic issues of this very common condition.

scholarly journals Inhibition of IgE-dependent Mouse Triphasic Cutaneous Reaction by a Boiling Water Fraction Separated from Mycelium ofPhellinus linteus

2005 ◽  
Vol 2 (3) ◽  
pp. 369-374 ◽  
Author(s):  
Naoki Inagaki ◽  
Tomonori Shibata ◽  
Tomokazu Itoh ◽  
Tomohiro Suzuki ◽  
Hiroyuki Tanaka ◽  
...  
Keyword(s):  
Interferon Γ ◽  
Water Soluble ◽  
Cutaneous Reaction ◽  
Boiling Water ◽  
Interleukin 4 ◽  
Second Phase ◽  
Antitumor Effects ◽  
Mouse Splenocytes ◽  
Water Fraction ◽  
Factor Α

Phellinus linteus, a mushroom, contains constituents that exhibit potent antitumor effects through activating immune cells. Recently, anti-inflammatory and anti-allergic properties ofP. linteusextracts have also been implicated. In the present study, therefore, we separated the constituents of mycelium ofP. linteusinto five fractions—chloroform-soluble (CF), ethyl acetate-soluble (EA), methanol-soluble (AE), water-soluble (WA) and boiling water-soluble (BW) fractions—and examined their suppressive effects on the IgE-dependent mouse triphasic cutaneous reaction. The triphasic reaction was induced in the ear of BALB/c mice passively sensitized with anti-dinitrophenol IgE by painting with 2,4-dinitrofluorobenzene 24 h later. Ear swelling appeared triphasically with peak responses at 1 h, 24 h and 8 days after the challenge. ME, WA and BW given orally at a dose of 100 mg kg−1 significantly inhibited the first and second phase ear swelling, and BW also inhibited the third phase response. CF only inhibited the second phase. The inhibition by BW was the most potent and almost dose-dependent at doses of 30–300 mg kg−1. BW also inhibited vascular permeability increase caused by passive cutaneous anaphylaxis and histamine, and ear swelling caused by tumor necrosis factor-α. In contrast, BW apparently potentiated the production of interleukin-4 and interferon-γ from anti-CD3-stimulated mouse splenocytes. These results indicate that BW derived from mycelium ofP. linteuscontains some constituents with anti-allergic as well as immunopotentiating properties.

A Resorcinol-Formaldehyde Resin as an Embedding Material for Electron Microscopy of Membranes

1969 ◽  
Vol 27 ◽  
pp. 328-329 ◽  
Author(s):  
J. G. Robertson ◽  
D. F. Parsons
Keyword(s):  
Electron Microscopy ◽  
Osmium Tetroxide ◽  
Neutral Lipids ◽  
Lipid Extraction ◽  
Water Soluble ◽  
Formaldehyde Resin ◽  
Electron Microscope Autoradiography ◽  
Resorcinol Formaldehyde ◽  
Major Disadvantage ◽  
Cell Organization

The extraction of lipids from tissues during fixation and embedding for electron microscopy is widely recognized as a source of possible artifact, especially at the membrane level of cell organization. Lipid extraction is also a major disadvantage in electron microscope autoradiography of radioactive lipids, as in studies of the uptake of radioactive fatty acids by intestinal slices. Retention of lipids by fixation with osmium tetroxide is generally limited to glycolipids, phospholipids and highly unsaturated neutral lipids. Saturated neutral lipids and sterols tend to be easily extracted by organic dehydrating reagents prior to embedding. Retention of the more saturated lipids in embedded tissue might be achieved by developing new cross-linking reagents, by the use of highly water soluble embedding materials or by working at very low temperatures.

Grain Refinement in Titanium-Erbium Alloys

1974 ◽  
Vol 32 ◽  
pp. 522-523
Author(s):  
B. B. Rath ◽  
J. E. O'Neal ◽  
R. J. Lederich
Keyword(s):  
Electron Microscopy ◽  
Size Distribution ◽  
Grain Refinement ◽  
Grain Growth ◽  
Volume Fraction ◽  
Pure Titanium ◽  
Systematic Investigation ◽  
Second Phase ◽  
Titanium Matrix ◽  
Average Size

Addition of small amounts of erbium has a profound effect on recrystallization and grain growth in titanium. Erbium, because of its negligible solubility in titanium, precipitates in the titanium matrix as a finely dispersed second phase. The presence of this phase, depending on its average size, distribution, and volume fraction in titanium, strongly inhibits the migration of grain boundaries during recrystallization and grain growth, and thus produces ultimate grains of sub-micrometer dimensions. A systematic investigation has been conducted to study the isothermal grain growth in electrolytically pure titanium and titanium-erbium alloys (Er concentration ranging from 0-0.3 at.%) over the temperature range of 450 to 850°C by electron microscopy.

Ferritin Labeled Antibody Staining of Thin Sections

1969 ◽  
Vol 27 ◽  
pp. 420-421
Author(s):  
J. D. McLean ◽  
S. J. Singer
Keyword(s):  
Biological Material ◽  
Water Soluble ◽  
Thin Sections ◽  
Antibody Staining ◽  
Thin Sectioning ◽  
Ultrathin Sections

The successful application of ferritin labeled antibodies (F-A) to ultrathin sections of biological material has been hampered by two main difficulties. Firstly the normally used procedures for the preparation of material for thin sectioning often result in a loss of antigenicity. Secondly the polymers employed for embedding may non-specifically absorb the F-A. Our earlier use of cross-linked polyampholytes as embedding media partially overcame these problems. However the water-soluble monomers used for this method still extract many lipids from the material.

TEM Studies of Grain Boundary Films in Si3N4 Ceramics

1991 ◽  
Vol 49 ◽  
pp. 930-931
Author(s):  
H.-J. Kleebe ◽  
J.S. Vetrano ◽  
J. Bruley ◽  
M. Rühle
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Silicon Nitride ◽  
Hot Isostatic Pressing ◽  
Amorphous Film ◽  
Liquid Phase Sintering ◽  
Second Phase ◽  
High Temperature Mechanical Properties ◽  
Triple Points ◽  
Boundary Films

It is expected that silicon nitride based ceramics will be used as high-temperature structural components. Though much progress has been made in both processing techniques and microstructural control, the mechanical properties required have not yet been achieved. It is thought that the high-temperature mechanical properties of Si3N4 are limited largely by the secondary glassy phases present at triple points. These are due to various oxide additives used to promote liquid-phase sintering. Therefore, many attempts have been performed to crystallize these second phase glassy pockets in order to improve high temperature properties. In addition to the glassy or crystallized second phases at triple points a thin amorphous film exists at two-grain junctions. This thin film is found even in silicon nitride formed by hot isostatic pressing (HIPing) without additives. It has been proposed by Clarke that an amorphous film can exist at two-grain junctions with an equilibrium thickness.

Polishing process effect on the image of dispersed precipitates

1984 ◽  
Vol 42 ◽  
pp. 534-535
Author(s):  
C.T. Hu ◽  
C.W. Allen
Keyword(s):  
Matrix Material ◽  
Specimen Preparation ◽  
Second Phase ◽  
Precipitate Particle ◽  
Polishing Process ◽  
Second Phase Particles ◽  
The Matrix ◽  
Surface Profiles ◽  
Thinning Process

One important problem in determination of precipitate particle size is the effect of preferential thinning during TEM specimen preparation. Figure 1a schematically represents the original polydispersed Ni3Al precipitates in the Ni rich matrix. The three possible type surface profiles of TEM specimens, which result after electrolytic thinning process are illustrated in Figure 1b. c. & d. These various surface profiles could be produced by using different polishing electrolytes and conditions (i.e. temperature and electric current). The matrix-preferential-etching process causes the matrix material to be attacked much more rapidly than the second phase particles. Figure 1b indicated the result. The nonpreferential and precipitate-preferential-etching results are shown in Figures 1c and 1d respectively.

Structure of second phases in TiAl alloys containing Cr and B

1991 ◽  
Vol 49 ◽  
pp. 576-577
Author(s):  
Ernest L. Hall ◽  
Shyh-Chin Huang
Keyword(s):  
Grain Size ◽  
Second Phase ◽  
Structure And Properties ◽  
Tial Alloys ◽  
Second Phases ◽  
Interstitial Elements

Addition of interstitial elements to γ-TiAl alloys is currently being explored as a method for improving the properties of these alloys. Previous work in which a number of interstitial elements were studied showed that boron was particularly effective in refining the grain size in castings, and led to enhanced strength while maintaining reasonable ductility. Other investigators have shown that B in γ-TiAl alloys tends to promote the formation of TiB2 as a second phase. In this study, the microstructure of Bcontaining TiAl alloys was examined in detail in order to describe the mechanism by which B alters the structure and properties of these alloys.

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