149,028 research outputs found
Extracting Boer-Mulders functions from p+D Drell-Yan processes
No full textWe extract the Boer- Mulders functions of valence and sea quarks in the proton from unpolarized p + D Drell- Yan data measured by the FNAL E866 Collaboration. Using these Boer- Mulders functions, we calculate the cos2 phi asymmetries in unpolarized pp Drell- Yan processes, both for the FNAL E866/ NuSea and the BNL Relativistic Heavy Ion Collider experiments. We also estimate the cos2 phi asymmetries in the unpolarized p (P) over bar Drell- Yan processes at GSI.Astronomy & AstrophysicsPhysics, Particles & FieldsSCI(E)37ARTICLE5null7
Polarization effects in proton-proton collisions within the Standard Model and beyond
Get PDFBoer, D. [Promotor]Mulders, P.J.G. [Promotor
Effects of instanton interactions on the phases of quark matter
Get PDFMulders, P.J.G. [Promotor]Boer, D. [Copromotor
Signatures of gluon saturation in high energy scattering
Get PDFMulders, P.J.G. [Promotor]Boer, D. [Copromotor
Coronary heart disease risk : family history and gene-environment interaction
No full textThe first part of this thesis describes research into lifestyle, genetic, and biological factors that may underlie the increased risk for coronary heart disease (CHD) in individuals with a family history of this disorder. The second part of this thesis describes whether levels of plasma lipids and lipoproteins - which are among the major CHD risk factors - are influenced by the interaction between common gene polymorphisms and lifestyle-related factors. A large cohort study was used to evaluate the association between family history and CHD mortality. The association of a family history with gene polymorphisms, lifestyle-related and biological CHD risk factors, as well as gene-environment interactions were studied cross-sectionally. For this purpose subsamples from a large population-based project (the Cardiovascular Disease Risk Factor Monitoring Project) and the European Atherosclerosis Research Study (EARS) were used.Family history increased the risk for CHD death in men and women. Only a small part was mediated through known CHD risk factors. The most pronounced characteristics of individuals with a family history were the higher levels of total cholesterol and apolipoprotein (apo) B as compared to subjects without a family history. The contribution of lifestyle-related (i.e. modifiable) factors to higher apo B levels in individuals with a family history was small; most of it seemed to be genetically determined. The apo E polymorphism is probably one of the most important genetic factors involved. Besides the apo E4 isoform, the D9N mutation and the N291S mutation in lipoprotein lipase (LPL) were more frequent among subjects with a parental history of premature myocardial infarction. Other gene polymorphisms (LPL S447X, CETP TaqIB and apo CIII SstI) proved to be non-informative.Like family history, genotypes can not be modified. However, the effect of some polymorphisms clearly depended on lifestyle-related factors. A significant interaction between the apo E2 isoform and body mass index was found in EARS as well as in the population-based sample of Dutch origin. Surprisingly, in EARS the association between BMI and apo B levels was more pronounced in E2-carriers compared to subjects with other phenotypes, while in the Dutch sample the association was weaker in apo E2-carriers. Further, a strong interaction between the LPL D9N mutation and physical activity became apparent. Physically inactive carriers of the mutation (n=5) had considerably higher total cholesterol and apo B levels compared to non-carriers, whereas their HDL-cholesterol concentrations were lower. This was not the case for physically active carriers of this mutation (n=10). Our studies also showed that only among moderate alcohol consumers, subjects with the CETP B2B2 genotype presented with higher mean HDL-cholesterol levels compared to subjects with other genotypes. Furthermore, smokers with the apo CIII S1S2 genotype had higher levels of triglycerides and apo B and somewhat lower levels of HDL-cholesterol, compared to smokers with the S1S1 genotype. This was not observed among non-smokers.It is concluded that the underlying mechanisms for the increased risk in individuals with a family history of CHD remain unclear. The risk of CHD is highest in individuals with a family history and unfavorable levels of other CHD risk factors. Therefore, assessing family history is important for risk prediction and prevention, despite the fact that family history by itself cannot be changed. Since little is known about the most useful definition of a family history more large long-term prospective studies are needed. Furthermore, gene-environment interaction implies that a genetic predisposition to unfavorable lipid levels and consequently CHD risk is not in all cases something of which the consequences cannot be influenced. However, our insights into specific gene-environment interactions is limited. More research is needed before our knowledge about gene-environment interactions can be applied for better focusing preventive measures to subgroups in the population that are susceptible to CHD.</p
KERAGAMAN GENETIK KAMBING BOER BERDASARKAN ANALISIS SEKUEN DNA MITOKONDRIA BAGIAN D-LOOP
Get PDFPenelitian ini bertujuan untuk mengidentifikasi keragaman genetik Kambing Boer berdasarkan analisis sekuen daerah D-loop pada DNA Mitokondria (mtDNA) untuk menjelaskan asal-usul kambing tersebut berdasarkan garis keturunannya. Sebanyak 12 ekor sampel darah Kambing Boer, terdiri dari 11 ekor betina dan satu ekor jantan diambil dari CV. Kambing Burja. Sampel DNA diestraksi dari whole blood. Hasil ekstraksi DNA diamplifikasi dengan proses Polymerase Chain Reaction (PCR) pada fragment DNA mitokondria bagian D-loop menggunakan primer forward (F:5’-CGCTCGCCTACACACAAATA-3’) dan primer reverse (R:5’-AATGCCCATGC CTACCATTA-3’) pada ukuran hasil PCR 778 bp. Nilai keragaman haplotipe (Hd) Kambing Boer sebesar 0,8182±0.070 dan keragaman nukleotida (π) bernilai 0,01833. Sedangkan Hd Kambing Boer dengan sekuen pembanding sebesar 0,9744±0.013 dan π 0,16671. Sekuen dari hasil PCR selanjutnya direkonstruksi dalam pohon filogenetik. Analisis pohon filogenetik menunjukkan terdapat empat garis keturunan yang berbeda yaitu Lineage A, B, C dan D. Kambing Boer yang digunakan dalam penelitian ini termasuk dalam haplogroup A dan B. Delapan individu kambing Boer dalam penelitian ini termasuk dalam haplogroup A dan 4 individu lainnya termasuk dalam haplogroup B. Perhitungan jarak genetik dari 12 individu kambing Boer berkisar 0,000-0,035, dengan rata-rata sebesar 0,019. Kambing Boer sendiri terbagi dalam 5 haplotipe (H1, H2, H3, H4 dan H5) dengan proporsi yang berbeda. Tiga individu Kambing Boer tersebar ke dalam H1 dan H2, 4 individu kambing Boer dalam penelitian ini tersebar ke dalam H3 dan satu individu tersebar ke dalam H1. Kesimpulan penelitian ini adalah Kambing Boer yang digunakan untuk sampel, memiliki keragaman genetik yang tinggi berdasar analisis sekuen daerah D-loop DNA mitokondria
Polarized gluon studies with charmonium and bottomonium at LHCb and AFTER
Get PDFRecently it has been put forward that linearly polarized gluons inside unpolarized protons affect the transverse momentum distribution of final state particles in hadronic collisions. They lead to a characteristic modulation of the differential cross section in Higgs production and to azimuthal asymmetries in, for instance, heavy quark pair production. Here we study the effect on charmonium and bottomonium production in hadronic collisions, such as at LHCb and at the proposed fixed target experiment AFTER at LHC. We focus mainly on the scalar and pseudoscalar quarkonia, eta_c, chi_{c0}, eta_b, chi_{b0}, which allow for an angular independent investigation. Within the framework of transverse momentum dependent (TMD) factorization in combination with the nonrelativistic QCD based color-singlet quarkonium model, we show for small transverse momentum (q_T^2 \ll 4 M_Q^2) that the scalar and pseudoscalar quarkonium production cross sections are modified in different ways by linearly polarized gluons, while their effects on the production of higher angular momentum quarkonium states are strongly suppressed. Comparisons to \chi_{c2}, \chi_{b2} production can help to cancel out uncertainties. Together with the analogous study in Higgs production at LHC, quarkonium production can moreover be used to test the scale dependence of the linearly polarized gluon distribution over a large energy range.Recently it has been put forward that linearly polarized gluons inside unpolarized protons affect the transverse momentum distribution of final state particles in hadronic collisions. They lead to a characteristic modulation of the differential cross section in Higgs production and to azimuthal asymmetries in, for instance, heavy quark pair production. Here we study the effect on charmonium and bottomonium production in hadronic collisions, such as at LHCb and at the proposed fixed target experiment AFTER at LHC. We focus mainly on the scalar and pseudoscalar quarkonia, eta_c, chi_{c0}, eta_b, chi_{b0}, which allow for an angular independent investigation. Within the framework of transverse momentum dependent factorization in combination with the nonrelativistic QCD based color-singlet quarkonium model, we show for small transverse momentum (q_T^2 \ll 4 M_Q^2) that the scalar and pseudoscalar quarkonium production cross sections are modified in different ways by linearly polarized gluons, while their effects on the production of higher angular momentum quarkonium states are strongly suppressed. Comparisons to chi_{c2}, chi_{b2} production can help to cancel out uncertainties. Together with the analogous study in Higgs production at LHC, quarkonium production can moreover be used to test the scale dependence of the linearly polarized gluon distribution over a large energy range
P. de Boer - verso
No full textBotanico: Boer, P. de. Titolo manoscritto sul recto, dove compaiono anche le note: Groninque; R. Tod. [Raccolta Todaro].
Nota manoscritto sul verso: 1896 D. P. de Boer Botanico professor Directeur du Jardin Botanique à Groninque
1 fotografia : albumina ; 92 x 53 mm.
Vai alla scheda bibliografica: https://galileodiscovery.unipd.it/discovery/fulldisplay?context=L&vid=39UPD_INST:VU1&search_scope=MyInst_and_CI&tab=Everything&docid=alma99001499768020604
Boer politics /
No full textAppendices (p. [119]-155): A. England, Holland and Germany.--B. Dr. Kuyper's admission.--C. The last pro-Boer manifestation.--D. South African critics.--E. The Transvaal and the peace conference held in Paris from September 30th to October 5th, 1900.The translation was made at the London office of Le Siècle, under the direction of Jules Hedeman, assisted by Mrs. Ellen Waugh and Mr. Charles Baxter.Appeared originally in Le Siècle.Mode of access: Internet
P. de Boer - recto
No full textBotanico: Boer, P. de.
Titolo manoscritto sul recto, dove compaiono anche le note: Groninque; R. Tod. [Raccolta Todaro].
Nota manoscritto sul verso: 1896 D. P. de Boer Botanico professor Directeur du Jardin Botanique à Groninque.
1 fotografia : albumina ; 92 x 53 mm.
Vai alla scheda bibliografica: https://galileodiscovery.unipd.it/discovery/fulldisplay?context=L&vid=39UPD_INST:VU1&search_scope=MyInst_and_CI&tab=Everything&docid=alma99001499768020604
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