523 research outputs found
ERP System Evaluation on SOFI XP Based Accounting Module in Software House Industry
Accounting module is an important module for a company business process. The roles are in the form of parameter calculation of profits, losses and financial performance based on transaction, which basically is a real-time reporting system. The amount of company needs on accounting indicates that the accounting is one of the resources which support the establishment of a company. Thus, the company constantly improves the accounting performance, especially in handling of receivables, debts, and cash transactions. Evaluations which were performed at SOFI XP-based ERP system aims to provide a solution to a problem that was discovered during the analysis of the system needs. This evaluation was done in two stages: by collecting data and analyzing the system that running in the company. By doing this evaluation, the documentation of system performance and the solution for problems that were found in the company can be generated
Structural studies of Perfluoroaryldiselenadiazolyl Radicals: Insights into Dithiadiazolyl Chemistry
Synopsis
Diselenadiazolyls exhibit a stronger tendency to dimerize in the solid state than their corresponding dithiadiazolyl (DTDA) radicals, reflected in a range of dimerization modes for (p-XC6F4CNSeSeN)2, which contrast with those of the monomeric DTDA radicals, p-XC6F4CNSSN. The structure of (p-NCC6F4CNSeSeN)2 reflects a buildup of molecular strain in order to accommodate both dimerization and structure-directing CN···Se contacts, whereas the suppression of dimerization releases molecular strain yet retains structure-directing CN···S contacts for the corresponding DTDA radical
Reproductive success through high pollinator visitation rates despite self incompatibility in an endangered wallflower
PREMISE OF THE STUDY: Self incompatibility (SI) in rare plants presents a unique challenge—SI protects plants from inbreeding depression, but requires a sufficient number of mates and xenogamous pollination. Does SI persist in an endangered polyploid? Is pollinator visitation sufficient to ensure reproductive success? Is there evidence of inbreeding/outbreeding depression? We characterized the mating system, primary pollinators, pollen limitation, and inbreeding/outbreeding depression in Erysimum teretifolium to guide conservation efforts. METHODS: We compared seed production following self pollination and within- and between-population crosses. Pollen tubes were visualized after self pollinations and between-population pollinations. Pollen limitation was tested in the field. Pollinator observations were quantified using digital video. Inbreeding/outbreeding depression was assessed in progeny from self and outcross pollinations at early and later developmental stages. KEY RESULTS: Self-pollination reduced seed set by 6.5× and quadrupled reproductive failure compared with outcross pollination. Pollen tubes of some self pollinations were arrested at the stigmatic surface. Seed-set data indicated strong SI, and fruit-set data suggested partial SI. Pollinator diversity and visitation rates were high, and there was no evidence of pollen limitation. Inbreeding depression (δ) was weak for early developmental stages and strong for later developmental stages, with no evidence of outbreeding depression. CONCLUSIONS: The rare hexaploid E. teretifolium is largely self incompatible and suffers from late-acting inbreeding depression. Reproductive success in natural populations was accomplished through high pollinator visitation rates consistent with a lack of pollen limitation. Future reproductive health for this species will require large population sizes with sufficient mates and a robust pollinator community
Synthesis and reactivity of fluorinated triaryl aluminum complexes
The addition of the Grignard 3,4,5-ArFMgBr to aluminum(III) chloride in ether generates the novel triarylalane Al(3,4,5-ArF)3·OEt2. Attempts to synthesize this alane via transmetalation from the parent borane with trimethylaluminum gave a dimeric structure with bridging methyl groups, a product of partial transmetalation. On the other hand, the novel alane Al(2,3,4-ArF)3 was synthesized from the parent borane and trimethylaluminum. Interestingly, the solid-state structure of Al(2,3,4-ArF)3 shows an extended chain structure resulting from neighboring Al···F contacts. Al(3,4,5-ArF)3·OEt2 was then found to be an effective catalyst for the hydroboration of carbonyls, imines, and alkynes with pinacolborane
Metal-free tandem rearrangement/lactonization: Access to 3,3-disubstituted benzofuran-2-(3H)-ones
A novel metal‐free synthesis of 3,3‐disubstituted benzofuran‐2(3H)‐ones from the reaction between α‐aryl‐α‐diazoacetates and triarylboranes is presented. Initially, triarylboranes were successfully investigated in α‐arylations of α‐diazoacetates, however in the presence of an ortho‐heteroatom substituent the boron enolate intermediate undergoes an intramolecular rearrangement to form a quaternary center. The intermediate cyclizes affording valuable 3,3‐disubstituted benzofuranones in good yield
Plant-soil interactions during the native and exotic range expansion of an annual plant
We thank the greenhouse and technical staff at UC Santa Cruz and NIOO-KNAW for facilities and plant care, especially Jim Velzy and Sylvie Childress, and Renske Jongen and Freddy C. ten Hooven. We are grateful to Colby Cole, Asa Conover, Kelsey Songer, and Andrew Lopez for planting, harvesting, and root washing. Many thanks to Matthew Hartfield, Josie Borden, and Dante Park for their fieldwork assistance. We appreciate the permitting agencies that allowed us to collect seed and soil for this study: US Forest Service, Santa Clara County Parks, Midpeninsula Regional Open Space District, Don Edwards San Francisco Bay National Wildlife Refuge, and the Santa Clara Valley Water District. Seeds were collected following the Nagoya Protocol (French certificate of compliance TREL2302365S/653) and imported into the United States using APHIS permit P37-18-01389. This research was funded by the United States Department of Agriculture, National Institute of Food and Agriculture (Agriculture and Food Research Initiative Grant 2020-67013-31856 to I.M.P). N.L. acknowledges support from the Swiss National Science Foundation (Early.Postdoc mobility fellowship P2EZP3_178481), Natural Environment Research Council (Standard Grant NE/W006553/1), and the UKRI Horizon Europe Guarantee Research Scheme (Marie-Sklodowska-Curie European Fellowship EP/X023362/1). T.M.R.C. was funded by ENS de LyonPeer reviewe
Threshold responses to morphogen gradients by zero-order ultrasensitivity
Translating a graded morphogen distribution into tight response borders is central to all developmental processes. Yet, the molecular mechanisms generating such behavior are poorly understood. During patterning of the Drosophila embryonic ventral ectoderm, a graded mitogen-activated protein kinase (MAPK) activation is converted into an all-or-none degradation switch of the Yan transcriptional repressor. Replacing the cardinal phosphorylated amino acid of Yan by a phosphomimetic residue allowed its degradation in a MAPK-independent manner, consistent with Yan phosphorylation being the critical event in generating the switch. Several alternative threshold mechanisms that could, in principle, be realized by this phosphorylation, including first order, cooperativity, positive feedback and zero-order ultrasensitivity, were analyzed. We found that they can be distinguished by their kinetics and steady-state responses to Yan overexpression. In agreement with the predictions for zero-order kinetics, an increase in Yan levels did not shift the degradation border, but significantly elevated the time required to reach steady state. We propose that a reversible loop of Yan phosphorylation implements a zero-order ultrasensitivity-like threshold mechanism, with the capacity to form sharp thresholds that are independent of the level of Yan
Diazaphospholene and diazaarsolene derived homogeneous catalysis
The past 20 years has seen significant advances in main group chemistry and their use in catalysis. This minireview showcases the recent emergence of phosphorus and arsenic containing heterocycles as catalysts. With that, we discuss how the Group 15 compounds diazaphospholenes, diazaarsolenes, and their cationic counterparts have proven to be highly effective catalysts for a wide range of reduction transformations. This minireview highlights how the initial discovery by Gudat of the hydridic nature of the P–H bond in these systems led to these compounds being used as catalysts, and discusses the wide range of examples currently present in the literature
Supramolecular aggregation in dithia-arsoles: chlorides, cations and N-centred paddlewheels
The benzo-fused dithia-chloro-arsole derivative C6H4S2AsCl (1) is found to crystallise in the triclinic space group P[1 with combining macron] with 17 molecules in the asymmetric unit whereas the tolyl derivative, MeC6H3S2AsCl (2) is polymorphic with the α-phase crystallising in the monoclinic space group P21/c with a single molecule in the asymmetric unit and the β-phase adopting a triclinic structure with two molecules in the asymmetric unit. Reaction of these dithia-chloro-arsole derivatives with LiN(SiMe3)2 in a 3 : 1 mole ratio afforded the unique paddlewheel structure (MeC6H4S2As)3N (4)
Hybrid Enzyme-Polymeric Capsules/Mesoporous Silica Nanodevice for In Situ Cytotoxic Agent Generation
A novel nanocarrier based on functionalized mesoporous silica nanoparticles able to transport a non-toxic pro-drug and the enzyme responsible for its activation is presented. This nanodevice is able to generate in situ cytotoxic species once accumulated in the tumoral cell. Enzymes are sensitive macromolecules which can suffer denaturalization in biological media due to the presence of proteases or other aggressive agents. Moreover, the direct attachment of enzymes to the silica surface can reduce their activity by conformational changes or active site blockage. For these reasons, in order to create a robust system able to work in living organisms, the enzymes are previously coated with a protective polymeric shell which allows the attachment on the silica surface preserving their activity. The efficacy of this hybrid nanodevice for antitumoral purposes is tested against several human tumoral cells as neuroblastoma and leukemia showing significant efficacy. It converts this device in a promising candidate for further in vivo studies for oncology therapy
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