888,566 research outputs found
C-H-activated aluminum hydroxide via molecular oxygen
No full textThe reaction of LAl[eta(2)-(C-2(SiMe3)(2))] (1; L = HC[(CMe)(NDipp)](2), Dipp = 2,6-iPr(2)C(6)H(3)) with dioxygen leads to the elimination of bis(trimethylsilyl)acetylene and the formation of the corresponding aluminum monohydroxide via the oxidation of one of the CHMe2 groups on the Dipp ring
Li, C.P. -- 1976-82 -- Correspondence, Individual -- letter, 1976-09-07
No full textLetter from Li, C. P. to Sabin, Albert B. dated 1976-09-07.Sabin Collection Fair Use Policy</a
Synthesis of L-glucose and L-galactose derivatives from D-sugars
No full textAn efficient route to prepare L-glucose and L-galactose is described. The L-sugars are achieved by using the strategy of switching the functional groups at C1 and C5 of D-glucose and D-mannose. The oxidation and reduction of the silyl enol ether at C1 and the lead(IV) tetraacetate mediated oxidative decarboxylation at C5 are the key steps. L-Glucose and L-galactose are prepared in a convenient and inexpensive way. (C) 2014 Shu-Chun Li and Zhong-Jun Li. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000345880500003&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Chemistry, MultidisciplinarySCI(E)中国科技核心期刊(ISTIC)中国科学引文数据库(CSCD)[email protected]; [email protected]
Rotationally resolved infrared spectrum of the Li+-D-2 cation complex
No full textThe infrared spectrum of mass selected Li+-D-2 cations is recorded in the D-D stretch region (2860-2950 cm(-1)) in a tandem mass spectrometer by monitoring Li+ photofragments. The D-D stretch vibration of Li+-D-2 is shifted by -79 cm(-1) from that of the free D-2 molecule indicating that the vibrational excitation of the D-2 subunit strengthens the effective Li+center dot D-2 intermolecular interaction. Around 100 rovibrational transitions, belonging to parallel K-a=0-0, 1-1, and 2-2 subbands, are fitted to a Watson A-reduced Hamiltonian to yield effective molecular parameters. The infrared spectrum shows that the complex consists of a Li+ ion attached to a slightly perturbed D-2 molecule with a T-shaped equilibrium configuration and a 2.035 A vibrationally averaged intermolecular separation. Comparisons are made between the spectroscopic data and data obtained from rovibrational calculations using a recent three dimensional Li+-D-2 potential energy surface [R. Martinazzo, G. Tantardini, E. Bodo, and F. Gianturco, J. Chem. Phys. 119, 11241 (2003)]. (c) 2006 American Institute of Physics
Measurements of K S 0 - K L 0 asymmetries in the decays Λ c + → p K L , S 0 , p K L , S 0 π + π − and p K L , S 0 π 0
No full textAbstract Using e + e − annihilation data sets corresponding to an integrated luminosity of 4.5 fb −1, collected with the BESIII detector at center-of-mass energies between 4.600 and 4.699 GeV, we report the first measurements of the absolute branching fractions B Λ c + → p K L 0 = (1.67 ± 0.06 ± 0.04)%, B Λ c + → p K L 0 π + π − = (1.69 ± 0.10 ± 0.05)%, and B Λ c + → p K L 0 π 0 = (2.02 ± 0.13 ± 0.05)%, where the first uncertainties are statistical and the second systematic. Combining with the known branching fractions of Λ c + → p K S 0 , Λ c + → p K S 0 π + π − , and Λ c + → p K S 0 π 0 , we present the first measurements of the K S 0 - K L 0 asymmetries R Λ c + K S , L 0 X = B Λ c + → K S 0 X − B Λ c + → K L 0 X B Λ c + → K S 0 X + B Λ c + → K L 0 X in charmed baryon decays: R Λ c + p K S , L 0 = − 0.025 ± 0.031 , R Λ c + p K S , L 0 π + π − = − 0.027 ± 0.048 and R Λ c + p K S , L 0 π 0 = − 0.015 ± 0.046 . No significant asymmetries with statistical significance are observed
Hyllus C. L. Koch 1846
No full textGenus Hyllus C. L. Koch, 1846 Type species. Hyllus giganteus C. L. Koch, 1846 from Indonesia.Published as part of Lin, Yejie, Zhao, Huifeng, Koh, Joseph K H & Li, Shuqiang, 2022, Taxonomy notes on twenty-eight spider species (Arachnida: Araneae) from Asia, pp. 198-270 in Zoological Systematics 47 (3) on page 230, DOI: 10.11865/zs.2022303, http://zenodo.org/record/717585
A new genus Clypeolontha Li and Yang, for the genus Melolontha Fabricius (Coleoptera: Scarabaeidae: Melolonthinae) from Southeastern Asia
No full textKwalita’ tal-ħajja għat-tarbija li se titwieled
Full text linkFl-aħħar ħmistax-il sena psikologi ewlenin ikkonfermaw permezz ta’riċerka medika u l-esperjenza klinika li t-tarbija fil-ġuf tisma ', ittiegħem,
tħoss, u titgħallem; u dak li tesperjenza jibda jifforma l-attitudnijiet u l-aspettattivi tagħha dwarha nnifisha. Huwa ta 'importanza kbira allura, li
aħna nifhmu dan is-suġġett tajjeb biżżejjed, biex inkunu nistgħu nipprovdu l-aħjar ambjent u ħajja ta’ kwalita’ għat-tarbija fil-ġuf.
Iżda ħa niehdu pass wieħed wara l-ieħor ... Nixtieq li naqsam dawn il-ftit ħsibijiet magħkom, liebsa l-kpiepel differenti tiegħi ta’ social worker u
akkademika fil-qasam, ħaddiema volontarja maż-żgħażagħ u adulti għal ħafna snin, chairperson tal-kummissjoni nazzjonali familja - fejn aħna
nikkonċernaw ruhna dwar il-benesseri tal-membri kollha tal-familja – u fl-aħħar u mhux l-inqas omm ta 'żewġt itfal u omm li esperjenzajt it-telfa u
l-uġigħ ta’ miscarriage. Dan ma kienx sempliċiment esperjenza medika, iżda esperjenza profondament emozzjonali!
Jiena ħdimt u għadni naħdem ma' żgħażagħ u adulti li jkunu qed jesperjenzaw sens profond ta' rifjut, ansjetà, sens li qatt ma jistgħu jogħġbu lil
ħadd, wisq inqas lilhom infushom. Permezz ta’ ħidma intensiva, spiss jirnexxielna nittraċċaw l-għeruq ta 'dawn il-kwistjonijiet, għall-ħajja
tagħhom fil-ġuf. Tfal mhux mixtieqa, tfal mhux ippjanati; tfal li ommhom riedu jabortixxu; tfal li baqgħu ħajjin wara attentat ta’ abort ... it-taqlib
psikoloġiku u emozzjonali li jkunu qed jesperjenzaw fil-ħajja tagħhom huwa ta’ qsim il-qalb. Qrajt u qsamt hafna stejjer kliniċi ta' psikoterapewti u
ta' counsellors li esperjenzaw sitwazzjonijiet simili. Ir-riċerka fil-qasam qed tindika b'mod ċar li t-tarbija fil-ġuf hija sensittiva, tħoss, hija konxja u
tista’ tiftakar. Psikologi prenatali huma konvinti li l-qofol tal-personalità tal-bniedem tifforma fil-ġuf. Studji juru li din il-formazzjoni tal-personalità
isseħħ permezz ta' komunikazzjoni intensiva bejn il-ġenituri - speċjalment l-omm - u t-tarbija fil-ġuf. Hija l-kombinazzjoni ta' dawn ir-realtajiet li wassluni biex nagħżel li nitkellem dwar dan is-suġġett. Nemmen bis-sħiħ li nistgħu niżguraw li t-tfal
jikbru f’ambjent kemm jista’ jkun pożittiv, mill-mument tal-konċepiment. Il-ġuf huwa d-dinja ewlenija tat-tfal – u dawn it-tfal jistgħu jesperjenzaw
din id-dinja bħala faċli jew bħala ostili. Huwa inkontestabbli li l-kwalità tal-ambjent u l-kwalita’ tal-ħajja fil-ġuf, hija determinata prinċipalment millġenituri.peer-reviewe
Lithium Toxicity in Lepidium sativum L. Seedlings: Exploring Li Accumulation’s Impact on Germination, Root Growth, and DNA Integrity
Full text linkThe predicted increase in demand for minor metals for modern technologies raises major concerns regarding potential environmental concentration increases. Among the minor metals, lithium (Li) is particularly noteworthy due to growing demand for battery production. Concerns have been raised about the impact on biota of increasing Li concentrations in the environment. To expand the knowledge of the effects of Li on plants, garden cress (Lepidium sativum L.), a model plant for ecotoxicity assay, was tested in a 72 h test in Petri plates. The results showed a stimulation effect of Li at the lowest concentration (Li chloride 10 mg L−1) on seed germination and primary root elongation. Conversely, higher Li concentrations (50 and 150 mg L−1) caused a progressive impairment in both parameters. A genotoxic effect of Li on root cells, evaluated through the alkaline comet assay, was observed at each concentration tested, particularly at 150 mg L−1 Li chloride. Elemental analysis showed that Li accumulated in the seedlings in a dose–concentration relationship, confirming its ability to be readily absorbed and accumulated in plants. Given the likely increase in Li levels in the environment, further research is required to clarify the toxicity mechanisms induced by Li on growth and nucleic acids
Li-mediated N2 reduction reaction into NH3: recent outcomes and the SuN2rise Li-N2 cells concept
No full textOperating in severe conditions (at least 450 °C and, in particular, 200 atm), the Haber-Bosh (HB) process is responsible of around 1.44% of the global greenhouse gas emissions. To find a renewable-driven and delocalized electrochemical process complementary to HB for NH3 production could be a key solution for our society that is facing climate change crisis and is demographically growing.
The Li mediated (Li-m) pathway represents the most promising solution: thanks to the unique reducing power of this alkali metal, electrochemical cell with Li salt in aprotic environment achieves the highest Faradic efficiency (FE) in the N2 reduction reaction (NRR) research field. Different systems have been evaluated in literature for Li-m NRR, both in a continuous process in presence of a proton donor as ethanol and in a step-by-step system, to conduct Li nitridation in absence of H+ and avoid the competitive hydrogen evolution reaction (HER).
In comparison with Li-m NRR continuous systems, the step-by-step technology could alternate H2O presence, as proton donor, with the electrochemical reaction. The system degradation, the proton donor consumption and HER could be avoided. Moreover, the Li-N2 reaction in a completely aprotic environment could maximize Li exploitation. This technology could enhance scalability, since the Li reduction, essential for its recirculation, is the more energy requiring step.
The promising Li-N2 cells have been recently tested both for ammonia production and as energy storage devices, in similarity with metallic Li-gaseous batteries (e.g. Li-O2 devices); even if this technology is still in its infancy, a proof-of-concept of NH3 formation has been verified and our laboratory is currently addressing this challenge within the SuN2rise project
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