The crystal structure and electronic properties of LixMnPO4 (x=0, 0.5, 1) as cathode material of rechargeable lithium ion batteries, are studied through first principles calculations. Results show that the large volume change from LiMnPO4 to MnPO4 is mainly the result of Jahn–Teller (JT) distortion around Mn3+ ions in MnPO4. The JT effect also plays an important role in Li0.5MnPO4 compound. When the valence states of Mn ion change from bivalent to trivalent, Mn atom loses an electron which is initially localized at the Mn-3d(x2−y2) orbital. The results also show that the band gap of Li0.5MnPO4 is the smallest compared to LiMnPO4 and MnPO4.

The aim of our research was to study if cholesterol feeding might affect the ischemic changes in the vessels surrounding infarction foci in Sephadex G-75-induced cerebral ischemia model (SG-75). One hundred-twenty-four rabbits were divided as follows: group I was given standard food for 5 weeks; group II: as group I and then injected with SG-75; group III: standard food plus 1% cholesterol for 5 weeks; and group IV: as group III and then injected with SG-75. Rabbits were sacrificed 3 h, 6 h and 2, 5 and 7 days after ischemia had occurred. Vessels surrounding infarction foci (SIF) were identified by using a 6% carbon perfusion. Samples were examined by light microscopy and transmission electron microscopy (TEM). The occurrence of hemorrhagic infarction (HI) showed a clear time/course increase in group II whereas a decrease after 2 days in group IV was observed. The rate of HI was 40% and 20% in group II and IV, respectively. SIF vessels showed red blood cells leakage in group II, whereas multiple platelet thrombi appeared in group IV. This phenomenon caused a more extensive ischemic damage, when compared to group II. By making use of a widely employed model of high cholesterol diet and of a more physiological model of cerebral ischemia devised by us, we have provided the evidence that the hypercholesterolemia-induced changes in the SIF vessels strongly affect the pattern and progression of cerebral ischemia.

The aim of this research was to perform an in vivo study on the relationships between lipid oxide (LP), platelet aggregation and PAF-acetylhydrolase in a model using perfusion of cholesterol-rich LDL media diluted to physiological LDL-cholesterol concentration. Normal rabbits were infused with LDL (d 1.025-1.063 g/ml) extracted from rabbits previously fed either with standard food (I-LDL group), 1% cholesterol food (II-LDL group) or 1% cholesterol plus probucol (IV-LDL group). CU2+ modified II-LDL was also infused (III-LDL group). After dilution as above, LP increased significantly in III- and II-LDL media. After perfusion, LP significantly increased in III- and II-LDL groups as compared to baseline values and to control. Compared to the I-LDL group, PAF-acetylhydrolase and platelet aggregation significantly increased in III- and II-LDL groups. These data indicate the property of cholesterol- rich LDL to activate PAF-acetylhydrolase and enhance platelet aggregation, even when perfused through a medium containing a physiological LDL-cholesterol concentration.

The continuous-mass transfer matrix method (CTMM) is one of the few practical approaches to yield the “exact” solutions for free vibrations of a non-uniform beam carrying any number of concentrated elements. However, most of the existing CTMM does not consider the effects of shear deformation (SD), rotary inertia (RI), joint action term of SD and RI, and axial load. Thus, the objective of this paper is to present a simple formulation so that one can easily obtain the “exact“ natural frequencies and the associated mode shapes of a multi-step beam carrying arbitrary various concentrated elements (including eccentric lumped masses with rotary inertias, linear springs, rotational springs and spring-mass systems) in various boundary conditions with all the above-mentioned effects considered by using the modified CTMM. In addition to comparing with the existing relevant data, most of the numerical results obtained from the modified CTMM are also compared with those of the conventional finite element method (FEM) and good agreements are achieved.

Up to 50% of the riboflavin and up to 70% of the vitamin A in human drip breast milk samples were destroyed during controlled exposure to daylight, either in translucent polythene bottles, or where the milk was pumped through naso-gastric tubing from a syringe to mimic the conditions of enteral feeding. Losses were also observed in milk which was exposed to standard phototherapy illumination under conditions similar to those encountered in the ward, and in this case riboflavin was destroyed to a greater extent than vitamin A. Photodegradation of riboflavin may contribute to the high incidence of biochemical riboflavin deficiency reported in preterm infants receiving breast milk without vitamin supplements. The implications of these findings for feeding high risk term and preterm infants on donor milk are discussed, and the use of low actinic vessels and tubing to minimise photodegradation is recommended.

Intermediate field theory is used to obtain the matrix elements which determine the action of a homogeneous magnetic field on the energy levels of triplet states of asymmetric rotor molecules. Applications of these formulas are discussed (i) in relation to the Zeeman effect on the rotational fine structure of triplet–singlet transitions, where conditions are identified under which individual lines remain unbroadened by the field, and (ii) in connection with the magnetic tuning of singlet–triplet resonance.

Chemischer InformationsdienstVolume 5, Issue 28 Physical Organic Chemistry ChemInform Abstract: THE 3820 A BAND SYSTEM OF PROPYNAL, ROTATIONAL ANALYSIS OF THE O-O BAND, SINGLET-TRIPLET RESONANCE INTERACTION OF THE A(1)A′′ AND A(3)A′′ STATES OF PROPYNAL J. C. D. BRAND, J. C. D. BRANDSearch for more papers by this authorW. H. CHAN, W. H. CHANSearch for more papers by this authorD. S. LIU, D. S. LIUSearch for more papers by this authorJ. H. CALLOMON, J. H. CALLOMONSearch for more papers by this authorJ. K. G. WATSON, J. K. G. WATSONSearch for more papers by this author J. C. D. BRAND, J. C. D. BRANDSearch for more papers by this authorW. H. CHAN, W. H. CHANSearch for more papers by this authorD. S. LIU, D. S. LIUSearch for more papers by this authorJ. H. CALLOMON, J. H. CALLOMONSearch for more papers by this authorJ. K. G. WATSON, J. K. G. WATSONSearch for more papers by this author First published: July 16, 1974 https://doi.org/10.1002/chin.197428071AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume5, Issue28July 16, 1974 RelatedInformation

The 0-0 absorption band of the Ã1A″-X̃1A′ system of propynal, C2H·CHO, shows Zeeman effects in individual lines of the rotational structure in a magnetic field of 7.8 kG. These effects are attributed to a near-resonance interaction of specific rotational levels of Ã1A″ with levels of an excited vibrational state of ã3A″. The analysis indicates that the zeroth vibrational state of Ã1A″ interacts principally with a nontotally-symmetric vibrational state of 3A″, possibly ν6(a′) + ν7(a′) + ν10(a″), by vibronic spin-orbit coupling.

A detailed rotational analysis is presented for the 0-0 band of the Ã1A″-X̃1A′ electronic transition of normal propynal (HCCCHO), together with partial rotational analyses of the corresponding bands of the isotopes DCCCHO, HCCCDO, and DCCCDO. The positive inertial defects indicate planarity or near-planarity of the upper state. The rotational constants are consistent with a lengthening of the CO bond and a shortening of the CCC chain upon excitation.

Four singlet band systems in the region 2290–2910 Å attributed to the AsF molecule have been photographed both in emission and absorption at high dispersion. A complete rotational analysis of each band has been performed and the molecular constants are calculated for each of the four states, a1Δ, b1Σ+, c1Π and d1Π, involved in the transitions.

Four singlet band systems in the region 2290–2910 Å attributed to the AsF molecule have been observed in a microwave discharge through flowing AsF3 vapor. These are tentatively assigned to transitions involving two upper 1Π and the lower a1Δ and b1Σ states. Vibrational analysis gives values for ωe of 694.0 cm−1 and ωexe of 3.1 cm−1 for the a1Δ state, while interfering bands did not allow calculation of constants for b1Σ. The absence of bands involving upper vibrational levels of the two 1Π states indicates that predissociation occurs in these states.