資料下載
Data download
熱門搜索:
Fitzgerald Industries International代理
Envirologix 轉基因快速檢測試紙
Epitomics現貨抗體目錄
ABgene代理30
Cayman Chemical 特約代理
EVE™ Slide(EVE細胞計數板)
法國ID-VET
美國Sutter 玻璃毛坯 BF100-50-10
Sinobio公司產品介紹
Abcam代理
genview
D12079BWestern Diet(高純度飼料)
TEAA Solution(貨號:553303;SP5890)
LSPN-50ABMI公司LYSOSTAPHIN中國總代理
天然小鼠補體C1q蛋白
merck 2012年價格表
發布時間:2023/5/5
點擊次數:334
emsdiasum是美國EMD集團旗下的一家生命科學試劑公司,總部位於(yu) 賓夕法尼亞(ya) 州的漢密爾頓。公司提供各種類型的生命科學試劑和相關(guan) 服務,包括免疫學、細胞生物學、分子生物學和蛋白質組學等領域。產(chan) 品線包括抗體(ti) 、蛋白質、細胞和細胞培養(yang) 試劑、分子生物學試劑、免疫學試劑、化學試劑和實驗室用品等。這些產(chan) 品廣泛應用於(yu) 醫學診斷、藥物研發、生命科學研究和臨(lin) 床應用等領域。EMSDiasum致力於(yu) 提供高質量的產(chan) 品和服務,並為(wei) 客戶提供定製化的解決(jue) 方案。公司的客戶包括製藥公司、生物技術公司、學術機構和獨立研究者等。同時,EMSDiasum還與(yu) 許多合作夥(huo) 伴合作,共同推進生命科學和醫學診斷的發展。
特別告知:為(wei) 保證產(chan) 品質量與(yu) 良好性能,所以在購買(mai) 相應產(chan) 品的同時我司會(hui) 收取一定量的運輸費用!!!本次報價(jia) 有效時間為(wei) 2023年5月5日---2023年12月31日。
貨號 | 品名 | 規格 | 價(jia) 格 | 品牌 | 貨期 |
0050-Au | Square 50 Mesh, Gold, 50/vial | vial | 3204 | emsdiasum | 6周 |
0050-Cu | Square 50 Mesh, Copper, 100/vial | vial | 504 | emsdiasum | 6周 |
0050-Ni | Square 50 Mesh, Nickel, 100/vial | vial | 576 | emsdiasum | 6周 |
0075-Au | Square 75 Mesh, Gold, 50/vial | vial | 3204 | emsdiasum | 6周 |
0075-Cu | Square 75 Mesh, Copper, 100/vial | vial | 522 | emsdiasum | 6周 |
0075-Ni | Square 75 Mesh, Nickel, 100/vial | vial | 540 | emsdiasum | 6周 |
0100-Au | Square 100 Mesh, Gold, 50/vial | vial | 3204 | emsdiasum | 6周 |
0100-Be | Beryllium Grids 100 Mesh | EA | 1188 | emsdiasum | 6周 |
0100-Cu | Square 100 Mesh, Copper, 100/vial | vial | 576 | emsdiasum | 6周 |
0100-Ni | Square 100 Mesh, Nickel, 100/vial | vial | 468 | emsdiasum | 6周 |
0101-0-PO | DUMONT STYLE 0, CARBON | ea | 1044 | emsdiasum | 6周 |
0102-7B-PO | Dumont Style 7B Inox | ea | 828 | emsdiasum | 6周 |
0103-7B-PO | Dumont Style 7B, Dumoxel | ea | 828 | emsdiasum | 6周 |
0103-00-PO | DUMONT #00 HIGH PRECISION | ea | 594 | emsdiasum | 6周 |
0103-2-PO | DUMONT #2 DUMOXEL | ea | 594 | emsdiasum | 6周 |
0103-3-PO | DUMONT #3 DUMOXEL | ea | 666 | emsdiasum | 6周 |
0103-4-PO | DUMONT #4 DUMOXEL | ea | 666 | emsdiasum | 6周 |
0103-55-PO | DUMONT #55 DUMOXEL | ea | 738 | emsdiasum | 6周 |
0103-5-PO | DUMONT #5 DUMOXEL | ea | 702 | emsdiasum | 6周 |
0103-5-TF | DUMONT #5 PTFE COATED | ea | 1026 | emsdiasum | 6周 |
0103-7-PO | DUMONT #7 DUMOXEL | ea | 738 | emsdiasum | 6周 |
0103-AA-PO | DUMONT #AA | ea | 630 | emsdiasum | 6周 |
0103-H-PO | DUMONT #H | ea | 612 | emsdiasum | 6周 |
0103-N1-PO | DUMONT N1 | ea | 612 | emsdiasum | 6周 |
0103-N4-PO | DUMONT N4 | ea | 720 | emsdiasum | 6周 |
0103-N5-PO | DUMONT N5 | ea | 738 | emsdiasum | 6周 |
0109-1-PO | DUMONT #1 HIGH PRECISION DUMOSTAR | ea | 900 | emsdiasum | 6周 |
0109-2A-PO | DUMONT #2A DUMOSTAR | ea | 900 | emsdiasum | 6周 |
0109-2-PO | DUMONT #2 DUMOSTAR | ea | 900 | emsdiasum | 6周 |
0109-3C-PO | DUMONT #3C DUMOSTAR | ea | 918 | emsdiasum | 6周 |
0109-3-PO | DUMONT #3 DUMOSTAR | ea | 918 | emsdiasum | 6周 |
0109-4-PO | DUMONT #4 DUMOSTAR | ea | 918 | emsdiasum | 6周 |
0109-7-PO | DUMONT #7 DUMOSTAR | ea | 936 | emsdiasum | 6周 |
0109-7B-PO | Dumont Style 7B, Dumostar | ea | 936 | emsdiasum | 6周 |
0150-Au | Square 150 Mesh, Gold, 50/vial | vial | 3204 | emsdiasum | 6周 |
0150-Cu | Square 150 Mesh, Copper, 100/vial | vial | 576 | emsdiasum | 6周 |
0150-Ni | Square 150 Mesh, Nickel, 100/vial | vial | 594 | emsdiasum | 6周 |
0200-Au | Square 200 Mesh, Gold, 50/vial | vial | 3204 | emsdiasum | 6周 |
0200-Be | Beryllium Grids 200 Mesh, DISCONTINUED | vial | 432 | emsdiasum | 6周 |
0200-Cu | Square 200 Mesh, Copper, 100/vial | vial | 576 | emsdiasum | 6周 |
0200-Ni | Square 200 Mesh, Nickel, 100/vial | vial | 594 | emsdiasum | 6周 |
0200-SS | Square SS200 Stainless Steel 500/v | vial | 1980 | emsdiasum | 6周 |
0202-N5AC-PO | DUMONT N5AC | ea | 1260 | emsdiasum | 6周 |
0202-N5-PO | DUMONT N5 | ea | 936 | emsdiasum | 6周 |
0202-N7AC-PO | DUMONT N7AC INOX | ea | 1242 | emsdiasum | 6周 |
0202-NOC-PO | DUMONT #NOC | ea | 774 | emsdiasum | 6周 |
0202-NO-PO | DUMONT STYLE NO INOX 2 TWEEZERS | ea | 792 | emsdiasum | 6周 |
0203-0-PO | DUMONT #0 BIOLOGICAL | ea | 702 | emsdiasum | 6周 |
0203-55-PO | DUMONT STYLE #55 DUMOXEL | ea | 846 | emsdiasum | 6周 |
0203-N3C-PO | DUMONT STYLE N3C DUMOXEL | ea | 918 | emsdiasum | 6周 |
0203-N7AC-PO | DUMONT N7AC | ea | 1116 | emsdiasum | 6周 |
0203-NC3-PO | DUMONT N3C | ea | 792 | emsdiasum | 6周 |
0203-NO-PO | DUMONT #NO DUMOXEL | ea | 918 | emsdiasum | 6周 |
0207-N5ACTI-PO | DUMONT N5AC Titanium | ea | 1458 | emsdiasum | 6周 |
0208-0-PO | DUMONT #0 INOX | ea | 666 | emsdiasum | 6周 |
0208-3-PO | DUMONT #3 INOX | ea | 720 | emsdiasum | 6周 |
0208-4AC-PO | DUMONT #4AC | ea | 1098 | emsdiasum | 6周 |
0208-5AC-PO | DUMONT #5AC INOX | ea | 1044 | emsdiasum | 6周 |
0215-Cu | Single Slot L0.2x1.5 Cu 100/v | vial | 720 | emsdiasum | 6周 |
0215-Ni | Single Slot L0.2x1.5 Ni 100/v | vial | 738 | emsdiasum | 6周 |
0250-Cu | Square 250 Mesh, Copper, 100/vial | vial | 576 | emsdiasum | 6周 |
0250-Ni | Square 250 Mesh, Nickel, 100/vial | vial | 594 | emsdiasum | 6周 |
0300-Au | Square 300 Mesh, Gold, 50/vial | vial | 3204 | emsdiasum | 6周 |
0300-Cu | Square 300 Mesh, Copper, 100/vial | vial | 576 | emsdiasum | 6周 |
0300-Ni | Square 300 Mesh, Nickel, 100/vial | vial | 594 | emsdiasum | 6周 |
0302-AA-PO | DUMONT STYLE aa, INOX 02 | ea | 504 | emsdiasum | 6周 |
0302-0-PO | DUMONT #0 STRAIGHT | ea | 540 | emsdiasum | 6周 |
0302-5-CO | DUMONT #5 EPOXY COATED | ea | 594 | emsdiasum | 6周 |
0302-5-PO | DUMONT #5 | ea | 540 | emsdiasum | 6周 |
0302-OO-CO | DUMONT #00 EPOXY COATED | ea | 468 | emsdiasum | 6周 |
0303-1-PO | DUMONT #1 DUMOXEL | ea | 522 | emsdiasum | 6周 |
0303-2-PO | DUMONT #2 | ea | 522 | emsdiasum | 6周 |
0303-3C-PO | DUMONT #3C | ea | 540 | emsdiasum | 6周 |
0303-3-PO | DUMONT #3 DUMOXEL | ea | 540 | emsdiasum | 6周 |
0303-4-PO | DUMONT #4 | ea | 522 | emsdiasum | 6周 |
0303-5-PO | DUMONT #5 DUMOXEL | ea | 522 | emsdiasum | 6周 |
0303-5-TF | DUMONT #5 PTFE COATED | ea | 666 | emsdiasum | 6周 |
0303-7-PO | DUMONT 7 | ea | 630 | emsdiasum | 6周 |
0304-00-CO | DUMONT #00 EPOXY COATED | ea | 558 | emsdiasum | 6周 |
0304-00SAESD-CO | DUMONT 00 SA ESD | ea | 558 | emsdiasum | 6周 |
0304-0-CO | DUMONT #0 EPOXY COATED | ea | 522 | emsdiasum | 6周 |
0304-180-PO | DUMONT 180 | ea | 522 | emsdiasum | 6周 |
0304-1-CO | DUMONT #1 EPOXY COATED | ea | 522 | emsdiasum | 6周 |
0304-27-PO | DUMONT #27 | ea | 504 | emsdiasum | 6周 |
0304-2A-CO | DUMONT #2A EPOXY COATED | ea | 576 | emsdiasum | 6周 |
0304-2ASAESD-CO | DUMONT 2A SA ESD | ea | 558 | emsdiasum | 6周 |
0304-2B-PO | DUMONT #2B | ea | 468 | emsdiasum | 6周 |
0304-2-CO | DUMONT #2 EPOXY COATED | ea | 522 | emsdiasum | 6周 |
0304-2SAESD-CO | DUMONT 2 SA ESD | ea | 540 | emsdiasum | 6周 |
0304-3C-CO | DUMONT #3C EPOXY COATED | ea | 612 | emsdiasum | 6周 |
0304-3SAESD-CO | DUMONT 3A SA ESD | ea | 558 | emsdiasum | 6周 |
0304-4-CO | DUMONT #4 EPOXY COATED | ea | 648 | emsdiasum | 6周 |
0304-5-TF | DUMONT #5 PTFE COATED | EA | 810 | emsdiasum | 6周 |
0304-7-PO | DUMONT 7 | ea | 576 | emsdiasum | 6周 |
0304-N1-PO | DUMONT N1 | ea | 540 | emsdiasum | 6周 |
0304-NOC-PO | DUMONT NOC | ea | 504 | emsdiasum | 6周 |
0304-NO-PO | DUMONT NO | ea | 558 | emsdiasum | 6周 |
0304-00SAESD-ET1 | Dumont Ergonomic ESD, Style 00, Red | ea | 648 | emsdiasum | 6周 |
0304-00SAESD-ET2 | Dumont Ergonomic ESD, Style 00, Black | ea | 648 | emsdiasum | 6周 |
0304-2SAESD-ET1 | Dumont Ergonomic ESD, Style 2, Red | ea | 702 | emsdiasum | 6周 |
0304-2SAESD-ET2 | Dumont Ergonomic ESD, Style 2, Black | ea | 702 | emsdiasum | 6周 |
0304-2ASAESD-ET1 | Dumont Ergonomic ESD, Style 2A, Red | ea | 666 | emsdiasum | 6周 |
0304-2ASAESD-ET2 | Dumont Ergonomic ESD, Style 2A, Black | ea | 666 | emsdiasum | 6周 |
0304-3SAESD-ET1 | Dumont Ergonomic ESD, Style 3, Red | ea | 702 | emsdiasum | 6周 |
0304-3SAESD-ET2 | Dumont Ergonomic ESD, Style 3, Black | ea | 702 | emsdiasum | 6周 |
0304-3CSAESD-ET1 | Dumont Ergonomic ESD, Style 3C, Red | ea | 774 | emsdiasum | 6周 |
0304-3CSAESD-ET2 | Dumont Ergonomic ESD, Style 3C, Black | ea | 774 | emsdiasum | 6周 |
0304-5SAESD-ET1 | Dumont Ergonomic ESD, Style 5, Red | ea | 684 | emsdiasum | 6周 |
0304-5SAESD-ET2 | Dumont Ergonomic ESD, Style 5, Black | ea | 684 | emsdiasum | 6周 |
0304-545SAESD-ET1 | Dumont Ergonomic ESD, Style 5/45, Red | ea | 720 | emsdiasum | 6周 |
0304-545SAESD-ET2 | Dumont Ergonomic ESD, Style 5/45, Black | ea | 720 | emsdiasum | 6周 |
0304-5ASAESD-ET1 | Dumont Ergonomic ESD, Style 5A, Red | ea | 720 | emsdiasum | 6周 |
0304-5ASAESD-ET2 | Dumont Ergonomic ESD, Style 5A, Black | ea | 720 | emsdiasum | 6周 |
0304-6SAESD-ET1 | Dumont Ergonomic ESD, Style 6, Red | ea | 720 | emsdiasum | 6周 |
0304-7SAESD-ET1 | Dumont Ergonomic ESD, Style 7, Red | ea | 792 | emsdiasum | 6周 |
0304-7SAESD-ET2 | Dumont Ergonomic ESD, Style 7, Black | ea | 792 | emsdiasum | 6周 |
0304-FSAESD-ET1 | Dumont Ergonomic ESD, Style F, Red | ea | 720 | emsdiasum | 6周 |
0304-FSAESD-ET2 | Dumont Ergonomic ESD, Style F, Black | ea | 720 | emsdiasum | 6周 |
0400-Au | Square 400 Mesh, Gold, 50/vial | vial | 3204 | emsdiasum | 6周 |
0400-Cu | Square 400 Mesh, Copper, 100/vial | vial | 666 | emsdiasum | 6周 |
0400-Ni | Square 400 Mesh, Nickel, 100/vial | vial | 648 | emsdiasum | 6周 |
0403-A275-PO | Dumont A275 | ea | 1944 | emsdiasum | 6周 |
0403-34A-PS | DUMONT 34A | ea | 828 | emsdiasum | 6周 |
0502-Cu | Rectangular L0.2x0.5 Cu 100/v | vial | 702 | emsdiasum | 6周 |
0502-Ni | Rectangular L0.2x0.5 Ni 100/v | vial | 702 | emsdiasum | 6周 |
0508-2B-PO | DUMONT #2B | ea | 738 | emsdiasum | 6周 |
0508-4-PO | DUMONT #4 INOX | ea | 828 | emsdiasum | 6周 |
0508-5A-PO | DUMONT #5A INOX | ea | 792 | emsdiasum | 6周 |
0508-5XL-PO | DUMONT #5XL BIOLOGICAL | ea | 1134 | emsdiasum | 6周 |
0508-7-PS | DUMONT STYLE DUMONT STYLE 7, INOX 08 | ea | 936 | emsdiasum | 6周 |
0508-7A-PO | Dumont 7 A | ea | 864 | emsdiasum | 6周 |
0508-7B-PO | DUMONT #7B | ea | 864 | emsdiasum | 6周 |
0708-AA-PS | AA EYELASH TWEEZER | ea | 720 | emsdiasum | 6周 |
0708-SS45-PS | SS/45 EYLASH TWEEZER | ea | 1026 | emsdiasum | 6周 |
0708-545-7-PS | EYELASH TWEEZER SSTYLE 5/45-7 | EA | 1098 | emsdiasum | 6周 |
0708-5A45-7-PS | EYELASH TWEEZERS STYLE 5A/45-7 | EA | 1098 | emsdiasum | 6周 |
0708-5AD-PS | EYELASH TWEEZER STYLE 5AD | EA | 1206 | emsdiasum | 6周 |
0708-6SP-SM | EYELASH TWEEZER STYLE 65P, SERRATED | EA | 1008 | emsdiasum | 6周 |
0808-65P-PS | EYELASH TWEEZER STYLE 65P | EA | 810 | emsdiasum | 6周 |
0708-7DSP-PS | EYELASH TWEEZER STYLE 7DSP | EA | 1404 | emsdiasum | 6周 |
0708-AAD-PS | EYELASH TWEEZER STYLE AAD | EA | 936 | emsdiasum | 6周 |
0708-5A-PS | EYELASH TWEEZER STYLE 5A | EA | 972 | emsdiasum | 6周 |
0600-Cu | Single Hole A600 Cu 100/v | vial | 756 | emsdiasum | 6周 |
0600-Ni | Single Hole A600 Ni 100/v | vial | 774 | emsdiasum | 6周 |
0620-Cu | Rectangular L2x0.6 Cu 100/v | vial | 792 | emsdiasum | 6周 |
0620-Ni | Rectangular L2x0.6 Ni 100/v | vial | 810 | emsdiasum | 6周 |
0800-Cu | Single Hole A800 Cu 100/v | vial | 720 | emsdiasum | 6周 |
0808-6SP-PS | EYELASH TWEEZER 6SP | EA | 810 | emsdiasum | 6周 |
0800-Ni | Single hole A800 Ni 100/v | vial | 846 | emsdiasum | 6周 |
1000 | CELL STRETCHERS SmcCS10 MANUAL CONTROLLED | EA | 90000 | emsdiasum | 6周 |
10000 | ACETONE, REAGENT GRADE | qt | 337.5 | emsdiasum | 6周 |
1000-Cu | Single Hole A1000 Cu 100/v | vial | 720 | emsdiasum | 6周 |
1000-Ni | Single Hole A1000 Ni 100/v | ea | 738 | emsdiasum | 6周 |
1100 | Cytostretcher | ea | 237510 | emsdiasum | 6周 |
1110 | Cyto Stretcher LV | ea | 435510 | emsdiasum | 6周 |
1120-1 | 50mm Cytostretcher Chamber Nanopattern Parallel | ea | 2376 | emsdiasum | 6周 |
1120-6 | 50mm Cytostretcher Chamber Nanopattern Parallel, 6/pk | pk | 11880 | emsdiasum | 6周 |
1121-1 | 50mm Cytostretcher Chamber Nanopattern Perpindicular | ea | 2376 | emsdiasum | 6周 |
1121-6 | 50mm Cytostretcher Chamber Nanopattern Perpindicular, 6/pk | pk | 11880 | emsdiasum | 6周 |
1122-1 | 50mm Cytostretcher Chamber NON pattern | ea | 1026 | emsdiasum | 6周 |
1122-6 | 50mm Cytostretcher Chamber Nonpatterned 6/pk | pk | 4554 | emsdiasum | 6周 |
1130-1 | 12mm Cytostretcher Chamber Nanopattern Parallel | ea | 792 | emsdiasum | 6周 |
1130-6 | 12mm Cytostretcher Chamber Nanopattern Parallel, 6/pk | pk | 3564 | emsdiasum | 6周 |
1131-1 | 12mm Cytostretcher Chamber Nanopattern Perpindicular | ea | 792 | emsdiasum | 6周 |
1131-6 | 12mm Cytostretcher Chamber Nanopattern Perpindicular, 6/pk | pk | 3564 | emsdiasum | 6周 |
1132-1 | 12mm Cytostretcher Chamber Nonpattern | ea | 468 | emsdiasum | 6周 |
1132-6 | 12mm Cytostretcher Chamber Nonpattern , 6/pk | pk | 2178 | emsdiasum | 6周 |
1140-1 | 5mm Cytostretcher Chamber Nanopattern Parallel | ea | 630 | emsdiasum | 6周 |
1140-6 | 5mm Cytostretcher Chamber Nanopattern Parallel, 6/pk | pk | 2772 | emsdiasum | 6周 |
1141-1 | 5mm Cytostretcher Chamber Nanopattern Perpindicular | ea | 576 | emsdiasum | 6周 |
1141-6 | 5mm Cytostretcher Chamber Nanopattern Perpindicular, 6/pk | pk | 2772 | emsdiasum | 6周 |
1142-1 | 5mm Cytostretcher Chamber Nonpattern | ea | 504 | emsdiasum | 6周 |
1142-6 | 5mm Cytostretcher Chamber Nonpattern , 6/pk | pk | 2376 | emsdiasum | 6周 |
10004-WA1-SM | Dumont Handle, Style WA1 | ea | 612 | emsdiasum | 6周 |
10004-WA2-SM | Dumont Handle, Style WA2 | ea | 612 | emsdiasum | 6周 |
10004-WA3-SM | Dumont Handle, Style WA3 | ea | 612 | emsdiasum | 6周 |
VIS-PTE-WA1 | Screws for WA Handle | ea | 36 | emsdiasum | 6周 |
10004-B159-SM | Dumont Essence, WA1 Handle with 159-BUIS Tips | ea | 972 | emsdiasum | 6周 |
TIP-159-BUI | Dumont B159 Replaceable Tip | ea | 648 | emsdiasum | 6周 |
10004-BF-SM | Dumont Essence, WA1 Handle with F-BUIS Tips | ea | 972 | emsdiasum | 6周 |
TIP-F-BUI | Dumont BF Replaceable Tip | ea | 648 | emsdiasum | 6周 |
10004-BFSP-SM | Dumont Essence, WA1 Handle with FSP-BUIS Tips | ea | 972 | emsdiasum | 6周 |
TIP-FSP-BUI | Dumont BFSP Replaceable Tip | ea | 648 | emsdiasum | 6周 |
10004-B2A-SM | Dumont Essence, WA1 Handle with 2A-BUIS Tips | ea | 972 | emsdiasum | 6周 |
TIP-2A-BUI | Dumont B2A Replaceable Tip | ea | 648 | emsdiasum | 6周 |
10004-B45-SM | Dumont Essence, WA1 Handle with 45-BUIS Tips | ea | 972 | emsdiasum | 6周 |
TIP-B45-BUI | Dumont B45 Replaceable Tip | ea | 648 | emsdiasum | 6周 |
10004-B7-SM | Dumont Essence, WA1 Handle with 7-BUIS Tips | ea | 972 | emsdiasum | 6周 |
TIP-7-BUI | Dumont B7 Replaceable Tip | ea | 648 | emsdiasum | 6周 |
10004-E4-SM | Dumont ESD, WA1 Handle with 4-ESD Tips | ea | 774 | emsdiasum | 6周 |
TIP-4-ESD | Dumont E4 Replaceable Tip | ea | 144 | emsdiasum | 6周 |
10004-E10A-SM | Dumont ESD ,WA1 Handle with 10A-ESD Tips | ea | 774 | emsdiasum | 6周 |
TIP-10A-ESD | Dumont E10A Replaceable Tip | ea | 144 | emsdiasum | 6周 |
10004-E15-SM | Dumont ESD, WA1 Handle with 15-ESD Tips | ea | 774 | emsdiasum | 6周 |
TIP-15-ESD | Dumont E15 Replaceable Tip | ea | 144 | emsdiasum | 6周 |
10004-E16-SM | Dumont ESD, WA1 Handle with 16-ESD Tips | ea | 774 | emsdiasum | 6周 |
TIP-16-ESD | Dumont E16 Replaceable Tip | ea | 144 | emsdiasum | 6周 |
關(guan) 鍵字:15710 157-8 17984-25 72196-12 16% Paraformaldehyde (formaldehyde) aqueous solution