What's the difference between since and upon?

Since


Definition:

  • (adv.) From a definite past time until now; as, he went a month ago, and I have not seen him since.
  • (adv.) In the time past, counting backward from the present; before this or now; ago.
  • (adv.) When or that.
  • (prep.) From the time of; in or during the time subsequent to; subsequently to; after; -- usually with a past event or time for the object.
  • (conj.) Seeing that; because; considering; -- formerly followed by that.

Example Sentences:

  • (1) Since fingernail creatinine (Ncr) reflects serum creatinine (Scr) at the time of nail formation, it has been suggested that Ncr level might represent that of Scr around 4 months previously.
  • (2) Since MIRD Committee has not published "S" values for Tl-200 and Tl-202, these have been calculated by a computer code and are reported.
  • (3) City badly missed Yaya Touré, on international duty at the Africa Cup of Nations, and have not won a league match since last April when he has been missing.
  • (4) This study compares the mortality of U.S. white males with that of Swedish males who have had the highest reported male life expectancies in the world since the early 1960s.
  • (5) Van Persie's knee injury meant that Mata could work in tandem with the delightfully nimble Kagawa, starting for the first time since 22 January.
  • (6) In dogs, cibenzoline given i.v., had no effects on the slow response systems, probably because of sympathetic nervous system intervention since the class 4 effects of cibenzoline appeared after beta-adrenoceptor blockade.
  • (7) The various evocational changes appear to form sets of interconnected systems and this complex network seems to embody some plasticity since it has been possible to suppress experimentally some of the most universal evocational events or alter their temporal order without impairing evocation itself.
  • (8) We considered the days of the disease and the persistence of symptoms since the admission as peculiar parameters between the two groups.
  • (9) Since 1987, it has become possible to obtain immature ova from the living animal and to let them mature, fertilize and develop into embryos capable of transplantation outside the body.
  • (10) The mobility on sodium dodecyl sulfate-polyacrylamide gel electrophoresis is anomalous since the undenatured, cross-linked proteins have the same Stokes radius as the native, uncross-linked alpha beta gamma heterotrimer.
  • (11) Since 1979 there has been an increase of 17,122 in the number of beds available in nursing homes.
  • (12) The epidemiology of HIV infection among women and hence among children has progressively changed since the onset of the epidemic in Western countries.
  • (13) The result has been called the biggest human upheaval since the Second World War.
  • (14) Since it was established, it has stoked controversy about contemporary art, though in recent years it has been more notable for its lack of sensationalism.
  • (15) Our Ph1-positive ALL revealed B-cell lineage leukemia, since their surface phenotype were Ia+ and CD10+ and they have rearranged immunoglobulin JH genes.
  • (16) Since the start of this week, markets have been more cautious, with bond yields in Spain reaching their highest levels in four months on Tuesday amid concern about the scale of the austerity measures being imposed by the government and fears that the country might need a bailout.
  • (17) Since the advance and return of sperm inside the tubes could facilitate the interaction of sperm with secretions participating in its maturation, the persistent infertility after vasectomy could be related to the contractile alteration that follows the excessive tubal distention.
  • (18) Since interferon alfa-2b (Intron A) is useful as a single agent, it is important to determine if interferon can be combined with standard chemotherapy to improve both response and survival in patients with cancer.
  • (19) Differentiation between these two types of lesions is of utmost importance since the surgical approach will be different.
  • (20) Since 1979, patients started on long-term lithium treatment at the Psychiatric Hospital in Risskov have been followed systematically with recording of clinical and laboratory variables before the start of treatment, after 6 and 12 months of treatment, and thereafter at yearly intervals.

Upon


Definition:

  • (prep.) On; -- used in all the senses of that word, with which it is interchangeable.

Example Sentences:

  • (1) Synthesis of choline esterase on the medium with acetylcholine at a concentration of 1% was increased more than twofold upon addition of glucose at a concentration of 0.1%.
  • (2) Cellulase regulation appears to depend upon a complex relationship involving catabolite repression, inhibition, and induction.
  • (3) These results show that the pathogenic phenotypes of MCF viruses are dissociable from the thymotropic phenotype and depend, at least in part, upon the enhancer sequences.
  • (4) We have investigated the increase in the spcDNA population upon cycloheximide treatment of individual sequences, which are found to amplify differentially.
  • (5) They had allegedly agreed that Younous would not be charged with any crime upon his arrival there and that he would not be detained in Morocco for longer than 72 hours.
  • (6) Induction of labor, based upon only (1) a finding of meconium in the amniocentesis group or (2) a positive test in the OCT group, was nearly three times more frequent in the amniocentesis group.
  • (7) The effects of glucagon-induced insulin secretion upon this lipid regulation are discussed that may resolve conflicting reports in the literature are resolved.
  • (8) The presently available data allow us to draw the following conclusions: 1) G proteins play a mediatory role in the transmission of the signal(s) generated upon receptor occupancy that leads to the observed cytoskeletal changes.
  • (9) We have evaluated the life-span of B lymphocytes by measuring the functional reactivity of normal B cells upon transfer into xid mice, which do not respond to anti-mu, fluoresceinated-Ficoll (FL-Ficoll) and 2,4,6-trinitrophenyl aminoethylcarbamylmethyl Ficoll (TNP-Ficoll).
  • (10) The third route was quantitated by its sensitivity to probenecid and its activity was increased in saline buffers and upon addition of glucose and was inhibited by oligomycin.
  • (11) This experimental system allows separation of three B lymphocyte developmental stages: early differentiation in vitro, progression to IgM secretion in vivo, and late differentiation dependent upon mature T lymphocytes in vivo.
  • (12) Data is available to support the early influences of enamel organ epithelium upon a responding mesenchyme in the determination of dental morphogenetic fields (Dryburg, 1967; Miller, 1969).
  • (13) Batson believes there is a “mood” that needs to be seized upon.
  • (14) Hypnosis might be looked upon as a method by which an unscrupulous person could sustain such a state of powerlessness in a victim.
  • (15) Based upon our clinical experience and this review of the literature, a suggested management protocol is presented.
  • (16) Group teaching compared to individualized teaching of the patients to collect their own aliquots did not appear to have a measurable effect upon the levels of bacteriuria.
  • (17) It appears that the effects of monocular lid suture upon MIN are in most respects similar to the effects of monocular lid suture previously reported for the A laminae.
  • (18) Following mass disasters and individual deaths, dentists with special training and experience in forensic odontology are frequently called upon to assist in the identification of badly mutilated or decomposed bodies.
  • (19) Accumulating evidence indicates that for most tumors, the switch to the angiogenic phenotype depends upon the outcome of a balance between angiogenic stimulators and angiogenic inhibitors, both of which may be produced by tumor cells and perhaps by certain host cells.
  • (20) Based upon the analysis of 1015 case records of patients, aged 16-70, with different hip joint pathology types, carried out during 1985-1990, there were revealed mistakes and complications after reconstructive-restorative operations.