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We produced a transgenic rodent malaria parasite ( Plasmodium berghei) that contained the luciferase gene under a promoter region of elongation factor-1α. These transgenic (TG) parasites expressed luciferase in all stages of their life cycle, as previously reported. However, we were the first to succeed in observing sporozoites as a mass in mouse skin following their deposition by the probing of infective mosquitoes. Our transgenic parasites may have emitted stronger bioluminescence than previous TG parasites.

The estimated number of injected sporozoites by mosquitoes was between 34 and 775 (median 80). Since luciferase activity diminished immediately after the death of the parasites, luciferase activity could be an indicator of the existence of live parasites.

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Our results indicated that sporozoites survived at the probed site for more than 42 hours. We also detected sporozoites in the liver within 15 min of the intravenous injection. Bioluminescence was not observed in the lung, kidney or spleen. We confirmed the observation that the liver was the first organ in which malaria parasites entered and increased in number. Introduction Visualizing technology has improved our understanding of the biology of malaria parasites. Green fluorescent protein (GFP)-expressing malaria parasites have been produced and detected in the red blood cells, cultured liver cells, and midgut and salivary glands of the mosquito ,.

Previous studies using GFP-expressing malaria parasites revealed how malaria parasites moved in the skin and invaded blood vessels during their migration to the liver ,. However, the fluorescence emitted by GFP was not strong enough to observe these parasites from outside of the animal.

To overcome this drawback, researchers have developed transgenic parasites that express luciferase; transgenic P. Berghei expressing luciferase (TG-PbLuc) was initially developed , , followed by transgenic P.

Yoelii-expressing luciferase (TG-PyLuc) ,. Not only the blood stage, but also the liver stage in the development of malaria parasites could be observed using TG-PbLuc and TG-PyLuc, and the liver was confirmed as the first organ that malaria parasites reached, entered, and increased in number. We succeeded in producing a similar TG-PbLuc and obtained results that were consistent with the findings of previous studies. However, we also found that our TG-PbLuc expressed stronger luciferase activity than that of the previous TG-PbLuc. When Anopheline mosquitoes infected with our TG-PbLuc sporozoites bit a mouse, luciferase activity could be detected in the skin of that mouse. When we injected 12,000 sporozoites intravenously into a mouse, luciferase activity in the liver could be detected from the outside within 15 minutes. We herein described how we followed TG parasites in the mouse body following the deposition of spozozoites.

Ethics statement Animal experiments were performed in a humane manner after receiving approval from the Institutional Animal Experiment Committee of Jichi Medical University. Experiments were conducted in accordance with Institutional Regulations for Animal Experiments and the Fundamental Guidelines for the Proper Conduct of Animal Experiment and Related Activities in Academic Research Institutions under the Jurisdiction of the Ministry of Education, Culture, Sports, Science and Technology of Japan. Transgenic malaria parasites The Plasmodium berghei ANKA clone 2.34 , a rodent malaria parasite, was used as a template parasite. Regarding the firefly luciferase gene (Gene Bank ID ), we purchased the pGL4.11 luciferase reporter vector (Promega Co., Madison, WI, USA). The firefly luciferase gene was amplified by PCR using a pair of primers (Luc-BamF: ggggatccATGGAAGACGCCAAAAACATAAAG and Luc-BamR: ggggatccTTACACGGCGATCTTTCCGCCCTTC).

The PCR product was digested by BamHI and ligated to the same restriction enzyme site in pL0011 (Malaria Research and Reference Reagent Resource Center, MR4 (The plasmid was then digested by ApaI and integrated into the small subunit ribosomal DNA locus in P. Berghei by single crossover recombination ,.

The resultant transgenic parasite line, PbLuc expressed luciferase during all stages under the control of the elongation factor 1-α promoter. Deposition of sporozoites into a mouse by infective mosquitoes Three infective mosquitoes were placed in a 15 ml-plastic tube (Corning Incorporated, NY, USA), and the head of the tube was covered with gauze. Mice were anesthetized, and the hair on the abdomen was shaved. To encourage mosquitoes to feed at this spot, we applied rubber tape with a hole 3 mm in diameter on the abdomen of the mouse. Infective mosquitoes were allowed to feed through the gauze and the hole in the rubber tape. Only one mosquito typically occupied the place to feed during the experimental period.

Blood feeding was not permitted because we raised the plastic tube every 12 seconds. Mosquitoes deposited saliva and sporozoites in the skin of the mouse, but could not feed on blood during the 12-second period.

This was repeated 10 times, and as a result, sporozoites were deposited in a limited area in the abdominal skin of the mouse. Detection of malaria parasites in mice using the in vivo imaging system (IVIS) IVIS (Xenogen Co., Alameda, CA, USA) was used as described previously ,. After probing by infective mosquitoes or artificial injections, anesthetized mice were peritoneally injected with 2 mg of d-luciferin firefly (Biosynth Biochemica & Synthetica, Staad, Switzerland) and were placed in the IVIS camera box for five minutes to count the bioluminescence of luciferin. Emission was accumulated and intensity was expressed as color. If transgenic malaria parasites were deposited in the skin, luciferin bioluminescence was detected at the skin site as an emitting spot. We could not observe each parasite in the skin because of the diffusion of photons in the tissue. We estimated the number of parasites using the sum of the counts from bioluminescence around each site.

Estimation of the number of sporozoites at probing sites Different numbers of sporozoites (0, 100, 1,000, and 10,000) were prepared in 20 μl of RPMI 1640 medium. Sporozoites were injected into the skin of the abdominal area of anesthetized and shaved mice. Bioluminescence was measured at each site of artificial injection. Three equations were then prepared from the bioluminescence results. Sixteen mice were probed by infective mosquitoes through a hole 3 mm in diameter.

The bioluminescence of the spots was measured and the number of sporozoites in the skin was estimated using these equations. Heat treatment A Kyu-kit was purchased from Sennen-Kyu Co., Ltd. (Tokyo, Japan), and heat treatment was performed as described previously. Infective mosquitoes were allowed to probe through the 3-mm hole as described above (12 seconds × 10 times).

We confirmed that sporozoites had been deposited in the mouse skin by IVIS. Kyu was then placed on the deposited site. Probing by infective mosquitoes took three minutes.

We then injected luciferin into the mouse and placed it in the IVIS box in order to confirm the deposition of sporozoites. This procedure required nine minutes. After confirming that sporozoites stayed at the skin spot, the Kyu treatment was initiated. Increasing the appropriate temperature to weaken sporozoites took three minutes. Thus, 15 minutes were needed to deposit sporozoites and heat them in the skin. Ten mice were used in this experiment. As a control, Kyu was placed on a separate location in 6 mice.

Luciferase activity of PbLuc after the death of parasites We adopted a sonication method to follow luciferase activity after the death of PbLuc parasites. Four Eppendorf tubes containing 4,000 PbLuc sporozoites in 0.8 ml of RPMI 1640 medium were prepared. One tube was sonicated for 1 second.

A subsequent sonication of 1 second was applied 5 seconds later. This was repeated for a total of 5 times. To avoid increases in temperature, these procedures were conducted in an ice-water container. The next tube was treated 3 times, and the next was treated 1 time. The last tube was not sonicated.

The tube content of 0.2 ml (1,000 sporozoites) was placed in three wells of a 96-well plate (Corning Incorporated, NY, USA). Bioluminescence was measured after the addition of 75 μg luciferin to each well. Injection of sporozoites into the tail vein of mice Different numbers of sporozoites were prepared in 50 μl of RPMI 1640 medium. Sporozoites were injected into the tail veins of anesthetized mice. A total of 2 mg of luciferin was then injected and bioluminescence was observed by IVIS. Mice were subsequently killed and the liver, lung, kidney and spleen were removed.

Each organ was cut into pieces and placed in each well of a 12-well plate (Corning Incorporated) with 0.8 ml of RPMI 1640 medium. Bioluminescence was recorded after the addition of 300 μg luciferin to each well. Monitoring one mouse after probing by an infective mosquito A mouse was monitored with the IVIS camera 0 h, 12 h, 24 h, 42 h, 72 h and 96 h after probing by an infective mosquito. The probed site expressed bioluminescence after at least 42 h.

This result suggested that some parasites remained alive for 42 hours after probing by the mosquito. The liver site became bright after 24 h and a strong emission was observed after 42 h. The whole body of the mouse expressed bioluminescence after 72 h, suggesting that parasites started circulating at the erythrocyte stage.

A marked increase in luciferase activity was observed after 96 h; however, parasitemia of the peripheral blood was only 0.001% at this time point. Visualization of sporozoites injected artificially into the skin of a mouse. (a) Different numbers of sporozoites were artificially injected.

Zero, 100, 1,000 and 10,000 sporozoites in 20 μl of RPMI 1640 medium were injected at the abdomen. We measured the bioluminescence of each spot probed by mosquitoes (16 mice) and estimated the number of sporozoites using the equations described in the Methods section. According to our estimation, the bite of one infective mosquito under the experimental conditions led to the deposition of between 34 and 776 (median 80) spotozoites in the skin (c). Effects of heat treatment on malaria parasites The mice that underwent heat treatment at the deposition site did not develop malaria parasites (a).

However, the mice that underwent heat treatment at a site other than the deposition site developed malaria parasites in the body (b). Nine out of the 10 mice that underwent heat treatment did not develop malaria. On the other hand, five out of the six mice that underwent the heat treatment at a separate site developed malaria parasites. These results indicated that the heat treatment weakened sporozoites in the skin.

Intravenous injection of sporozoites Sporozoites were injected intravenously, followed by luciferin 1 minute later. Mice were placed in the IVIS camera box, and bioluminescence was recorded for 5 minutes. The emission of sporozoites was observed in the liver as a mass when 12,000 or 48,000 sporozoites were injected but not when only 1,200 were injected. The intensity of emissions peaked 7 to 12 minutes after the sporozoite injection (a). Four organs (the liver, lung, kidney and spleen) were then removed and bioluminescence was recorded in each organ. Of these, only the liver emitted bioluminescence (b). These results demonstrated that sporozites attached to or were trapped in the liver within 15 minutes of entering the blood stream.

Discussion Rice et al. reported that 500 cells expressing luciferase were necessary for luciferin emission to be detected by IVIS, and Jin et al. demonstrated that the number of sporozoites injected into the ventral abdomen by an infective mosquito was approximatly 120. Therefore, we did not expect to be able to observe sporozoites in the skin immediately after their deposition by infective mosquitoes. Malaria parasites invade and then develop in liver cells. The number of parasites that developed in a liver cell after 42 hours was previously estimated to be between 1,500 and 2,500.

Therefore, we observed mice using the IVIS 42 h after the mosquito bite and succeeded in observing a mass of parasites expressing luciferase in the liver. The only organ that expressed strong emission was the liver. We treated more than 20 mice using the same procedure, but no organs other than the liver were found to express bioluminescence after 42 h.

These results were consistent with previous findings in which the liver was shown to be the first organ in which malaria parasites developed. We then directly injected sporozoites intravenously. Quality unit patch 2005 trump and family. Bioluminescence was observed in the liver immediately after the injection, but not in the spleen, lymph nodes or any other organ.

This result suggested that the liver possessed specific ligands to which malaria sporozoites attach. We also confirmed that our transgenic parasites could be detected in the liver if more than 12,000 sporozoites were injected. Luciferase emission could be detected in the skin 42 h and 72 h after probing.

The sites corresponded to the site bitten by the mosquito 42 h or 72 h previously (, ). We then attempted to expose mice that had just been bitten by an infective mosquito. We detected a strong emission at the site that had been bitten. This result suggested two possibilities: less than 100 cells in the skin could be detected by IVIS, or more than hundred sporozoites were injected by the mosquito. We then prepared a series of solutions containing 0, 100, 1,000 and 10,000 sporozoites in 20 μl of medium and injected the skin of a mouse at four sites.

Three spots containing sporozoites were detected with different emissions. A correlation was observed between the number of sporozoites and the density of bioluminescence. Thus, we confirmed that less than 100 sporozoites could be detected in the skin with IVIS. We also established that approximately 30–800 sporozoites were injected into the skin by an infective mosquito.

Based on these results, we considered our transgenic parasites to express higher luciferase activity than other transgenic parasites. We currently cannot explain why our PbLuc expressed higher luciferase activity. We used the same promoter region of elongation factor-1α as that used in a previous study.

In any case, we obtained a good tool for research at the malaria skin stage. We followed luciferase emission at the skin site following probing. Sporozoites were detected at 0 h, 24 h and 42 h with slight decreases in emission. This result indicated that a few sporozoites succeeded in entering the blood stream and were transported to the liver, while most sporozoites injected remained at the skin site. Yamaguchi et al. demonstrated that most sporozoites had moved from the injected site by 24 h, which is inconsistent with our results.

This may have been because of differences in sporozoite-injection methods. The above authors used an artificial syringe injection, while we used an infective mosquito from which sporozoites were injected via the saliva of the mosquito.

Although further studies are needed to clarify this issue, we confirmed that sporozoites stayed at the skin site for more than 24 hours when deposited by infective mosquitoes. The whole body of the mouse was blue with bioluminescence 72 h after probing because blood stage parasites had started circulating throughout the body. The biting site could no longer be observed at this stage, and parasites could hardly be detected using the Giemsa staining method. Parasitemia in this stage was estimated to be between 0.0001 and 0.001%. We conducted a heat treatment on the biting site after the deposition of sporozoites had been confirmed. We placed Kyu on the biting site.

The temperature on the skin surface increased to more than 65°C for at least 30 seconds. This procedure may have killed sporozoites in the skin. The heat-treated mice were mostly intact after this treatment: 9 out of 10 mice did not develop malaria. Another group of mice that were also probed with infective mosquitoes underwent the Kyu treatment, but at a site 10 mm from the biting site.

Five out of six mice developed malaria. This difference was significant ( P.

Sefer Torah at old, Cologne. A Sefer Torah (: ספר תורה‬; plural: ספרי תורה‬ Sifrei Torah; 'Book(s) of ' or 'Torah (s)') is a handwritten copy of the Torah, the holiest book in. It must meet extremely strict standards of production.

The Torah scroll is mainly used in the ritual of during. At other times, it is stored in the holiest spot within a, the, which is usually an ornate curtained-off cabinet or section of the synagogue built along the wall that most closely faces, the direction Jews face when.

The text of the Torah is also commonly printed and in for non-ritual functions. It is then known as a ('five-part', for the five books of Moses), and is often accompanied by commentaries or translations. A Sterling Silver Torah Case.

In some traditions the Torah is housed in an ornamental wooden case According to, a sefer Torah is a copy of the formal Hebrew text of the Torah hand-written on or (forms of ) (see below) by using a (or other permitted writing utensil) dipped in ink. Producing a sefer Torah fulfills one of the. “The k'laf/parchment on which the Torah scroll is written, the hair or sinew with which the panels of parchment are sewn together, and the quill pen with which the text is written all must come from ritually clean —that is, kosher— animals.” Written entirely in, a sefer Torah contains 304,805 letters, all of which must be duplicated precisely by a trained (“scribe”), an effort which may take as long as approximately one and a half years.

An error during transcription may render the sefer Torah pasul (“invalid”). According to the, all scrolls must also be written on gevil parchment that is treated with salt, flour and m'afatsim in order to be valid. Scrolls not processed in this way are considered invalid (Hilkoth Tefillin 1:8 & 1:14, Maimonides). The calfskin or parchment on which the sacred Hebrew text is written is mounted into a wooden housing called עץ חיים (Tree of Life) in Hebrew.

The housing has two rollers, each of which has two handles used for scrolling the text, four handles in all. Between the handles and the rollers are round plates or disks which are carved with images of holy places, engraved with dedications to the donor's parents or other loved ones, and decorated with gold or silver.

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Most modern Sifrei Torah are written with forty-two lines of text per column (Yemenite Jews use fifty one). Very strict rules about the position and appearance of the are observed. See for example the on the subject. Any of several Hebrew scripts may be used, most of which are fairly ornate and exacting.

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The fidelity of the Hebrew text of the, and the Torah in particular, is considered paramount, down to the last letter: translations or transcriptions are frowned upon for formal service use, and transcribing is done with painstaking care. Some errors are inevitable in the course of production. If the error involves a word other than the name of God, the mistaken letter may be obliterated from the scroll by scraping the letter off the scroll with a sharp object. If the name of God is written in error, the entire page must be cut from the scroll and a new page added, and the page written anew from the beginning. The new page is sewn into the scroll to maintain continuity of the document. The old page is treated with appropriate respect, and is buried with respect rather than being otherwise destroyed or discarded. The completion of the Sefer Torah is a cause for great celebration, and honored guests of the individual who commissioned the Torah are invited to a celebration wherein each of the honored guests is given the opportunity to write one of the final letters.

It is a great honor to be chosen for this. It is a for every Jewish male to either write or have written for him a Sefer Torah. Of the 613 commandments, one - the 82nd as enumerated by, and the final as it occurs in the text the (31:19) - is that every Jewish male should write a Sefer Torah in his lifetime.

( ) In modern times, it is usual for some scholars to become soferim and to be paid to complete a Sefer Torah under contract on behalf of a community or by individuals to mark a special occasion or commemoration. Because of the work involved, these can cost tens of thousands of to produce to ritually proper standards. A printed version of the Torah is known as a (plural Chumashim). They are treated as respected texts, but not anywhere near the level of sacredness accorded a Sefer Torah, which is often a major possession of a Jewish community. A chumash contains the Torah and other writings, usually organised for liturgical use, and sometimes accompanied by some of the main classic commentaries. Types of material permitted to use for a Sefer Torah.

A 200-year-old Yemenite Sefer Torah, on Gevil, from the Beith Keneseth Rambam in Jerusalem. The Sofer was from the Sharabi family There are three types of specially processed animal skin or: gevil (a full, un-split animal hide), Klaf (also Qlaf or K'laf), and, the latter two being one half of a split animal hide; arguably either the inner layer (adjacent to the flesh), or the outer layer (on which the hair grows). These are words to describe different types of parchment, although the term duchsustos is Greek. These are used for the production of a, and/or a Sefer Torah (“Torah scroll”). A kosher Sefer Torah should be written on gevil.

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If klaf is used in place of gevil, the Sefer Torah is still kosher, but this should not be done at the outset (l'chatchila). A Sefer Torah written on duchsustos is not kosher. Ingredients used in making ink for Hebrew scrolls today. After preparation, the scribe must mark out the parchment using the sargel (“ruler”) ensuring the guidelines are straight. Only the top guide is done and the letters suspended from it.

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The use of gevil and certain types of parchment has allowed some sifrei Torah of antiquity to survive intact for over 800 years. The ink used in writing scrolls had to adhere to a surface that was rolled and unrolled, so special inks were developed. Even so, ink would slowly flake off of scrolls.

If the ink from too many letters is lost, a Torah scroll is no longer used. External decorations. A set of sterling silver finials ( rimmonim) are used to decorate the top ends of the rollers. A completed Sefer Torah is treated with great honor and respect.

While not in use it is housed in the ( Aron Kodesh or Hekhal), which in its turn is usually veiled by an embroidered (curtain) as it should be according to Exodus 26:31-34. The scroll itself will often be girded with a strip of silk (see ) and 'robed' with a piece of protective fine fabric, called the 'Mantle of the Law'. It is decorated with an ornamental, scroll-handles ( ‘etz ḥayyim), and the principal ornament—the 'Crown of the Law', which is made to fit over the upper ends of the rollers when the scroll is closed.

Some scrolls have two crowns, one for each upper end. The metalwork is often made of beaten silver, sometimes gilded. The gold and silver ornaments belonging to the scroll are collectively known as kele kodesh (sacred vessels), and somewhat resemble the ornaments of the ( Kohen gadol).

The scroll-handles, breastplate and crown often have little bells attached to them. A, or pointer, may also be hung from the scroll, since the Torah itself should never be touched with the bare finger. This ornamentation does not constitute worship of the Sefer Torah, but is intended to distinguish it as sacred and holy, as the living word of God. Special prayers are recited when the Sefer Torah is removed from the ark (see ), and the text is chanted, rather than spoken, in a special melodic manner (see and ). Whenever the scroll is opened to be read it is laid on a piece of cloth called the mappah.

When the Sefer Torah is carried through the synagogue, the members of the congregation may touch the edge of their to the Sefer Torah and then kiss it as a sign of respect. In the and, the Sefer Torah is generally not robed in a mantle, but rather housed in an ornamental wooden case which protects the scroll, called a 'tik'. On the other hand, most — those communities associated with the Spanish diaspora, such as, the (with the exception of the Hamburg tradition ), and the communities of the — do not use tikim, but rather vestidos (mantles). Inauguration of a Torah scroll. Torah scrolls are escorted into a new synagogue in, Israel, 2006 The installation of a new sefer Torah into a synagogue, or into the sanctuary or of a, rabbinical college, university campus, nursing home, military base, or other institution, is done in a ceremony known as, or 'ushering in a Torah scroll'; this is accompanied by celebratory dancing, singing, and a festive meal.

This practice has its source in the escorting of the to, led by King. As described in the, this event was marked by dancing and the playing of musical instruments. Both the and David himself 'danced before the Ark' or 'danced before the Lord'. It is considered a tremendous merit to write (or commission the writing of) a Sefer Torah, and a significant honor to have a Sefer Torah written in one's honor or memory. See also. (Ktav Ashuri). (used to prepare for the reading of Sefer Torah in synagogue)., an initiative to prevent Sefer Torah theft References.