¼±Åà - È­»ìǥŰ/¿£ÅÍŰ ´Ý±â - ESC

 
"kidney medulla"¿¡ ´ëÇÑ °Ë»ö °á°úÀÔ´Ï´Ù. °Ë»ö °á°ú º¸´Â µµÁß¿¡ Tab ۸¦ ´©¸£½Ã¸é °Ë»ö âÀÌ ¼±Åõ˴ϴÙ.
´ëÇÑÀÇÇù ÀÇÇпë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 15 ÆäÀÌÁö: 3
  • ¿µ¹®
    ÇѱÛ
  • kidney rest
    ÄáÆÏ¹Þħ, ½ÅÀå¹Þħ
  • kidney stone
    ÄáÆÏµ¹, ½ÅÀå°á¼®
  • kidney ureter and bladder
    ÄáÆÏ¿ä°ü¹æ±¤´Ü¼øÃÔ¿µ
  • lobar kidney
    ºÐ¿±ÄáÆÏ
  • movable kidney
    À̵¿ÄáÆÏ, À̵¿½ÅÀå
  • myeloma kidney
    °ñ¼öÁ¾ÄáÆÏ, °ñ¼öÁ¾½ÅÀå
  • medullary sponge kidney
    ¼ÓÁú½ºÆÝÁöÄáÆÏ, ¼öÁúÇØ¸é½ÅÀå
  • microangiopathic hemolytic kidney
    ¹Ì¼¼Ç÷°üº´¿ëÇ÷ÄáÆÏ
  • nonvisualized kidney
    ¾Èº¸ÀÓÄáÆÏ
  • polycystic kidney
    ´Ù³¶½ÅÀå, ¹µÁÖ¸Ó´ÏÄáÆÏ
  • polycystic kidney disease
    ´Ù³¶½ÅÀ庴, ¹µÁÖ¸Ó´ÏÄáÆÏº´
  • sponge kidney
    ÇØ¸éÄáÆÏ, ÇØ¸é½ÅÀå
  • supernumerary kidney
    °ú´ÙÄáÆÏ, °ú´Ù½ÅÀå
  • sigmoid kidney
    ±¸ºÒÄáÆÏ
  • simple cystic kidney
    ´Ü¼ø³¶½ÅÀå, ȬÁÖ¸Ó´ÏÄáÆÏ
¿¾ ´ëÇÑÀÇÇù ÀÇÇпë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 14 ÆäÀÌÁö: 3
  • ¿µ¹®
    ÇѱÛ
  • kidney rest
    ÄáÆÏ¹Þħ, ½ÅÀå¹Þħ
  • kidney stone
    ÄáÆÏµ¹
  • lobar kidney
    ºÐ¿±ÄáÆÏ
  • microangiopathic hemolytic kidney
    ¹Ì¼¼Ç÷°üº´¿ëÇ÷ÄáÆÏ
  • movable kidney
    (¢¡hypermobile kidney) ¶áÄáÆÏ, À̵¿ÄáÆÏ
  • myeloma kidney
    °ñ¼öÁ¾ÄáÆÏ
  • nonvisualized kidney
    ¾Èº¸ÀÓÄáÆÏ
  • polycystic kidney
    ¹µÁÖ¸Ó´ÏÄáÆÏ, ´Ù³¶½ÅÀå
  • sigmoid kidney
    ±¸ºÒÄáÆÏ
  • simple cystic kidney
    ´Ü¼ø³¶ÄáÆÏ, ȬÁÖ¸Ó´ÏÄáÆÏ
  • sponge kidney
    ÇØ¸éÄáÆÏ
  • supernumerary kidney
    °úÀ×ÄáÆÏ
  • trifid kidney
    ¼¼°¥·¡ÄáÆÏ
  • wandering kidney
    (¢¡hypermobile kidney) ¶áÄáÆÏ, À̵¿ÄáÆÏ
¿¾ ´ëÇÑÀÇÇù 3 ÀÇÇпë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 15 ÆäÀÌÁö: 3
  • ¿µ¹®
    ÇѱÛ
  • veins of medulla oblongata
    ¼û³úÁ¤¸Æ
  • acquired cystic disease of the kidney
    ÈÄõ¼º ½Å³¶Æ÷Áúȯ
  • adenocarcinoma of kidney
    ½Å¼±¾Ï
  • amyloid kidney
    ¾Æ¹Ð·ÎÀÌµå ½Å
  • arteriosclerotic kidney
    µ¿¸Æ°æÈ­¼º ½Å (¡­ãì).
  • artificial kidney
    Àΰø ½ÅÀå(ìÑÍïãìíô)
  • artificial kidney
    Àΰø½ÅÀå.
  • cadaver kidney
    »çü½Å(ÞÝô÷ãì).
  • cake kidney =caked k.
    °úÀÚ»ó ½Å (¡­ãì).
  • cicatricial kidney
    ¼±Àå ¹ÝÈç½Å(ÚîýÝãì).
  • cirrhotic kidney
    ½Å°æº¯(Áõ)(ãìÌãܨñø).
  • congested kidney
    ¿ïÇ÷½Å(ê¦úìãì).
  • congestion kidney
    ¿ïÇ÷½Å.
  • crossed ectopy of the kidney
    ±³Â÷¼º ÀüÀ§½Å
  • cyanotic kidney
    û»ö½Å(ôìßäãì).
KMLE ÀÇÇоà¾î »çÀü À¯»ç °Ë»ö °á°ú : 5 ÆäÀÌÁö: 3
KUB Kidney, Ureter & Bladder; ½ÅÀå, ¿ä°ü, ¹æ±¤; ´Ü¼ø ¿ä·Î ÃÔ¿µ
  = Plain Film
  = Scout F...
PCK Poly-Cystic Kidney
AASK African American Study of Kidney Diseases and Hypertension Pilot Study
ACKD acquired cystic kidney disease
ADPKD autosomal dominant polycystic kidney disease
KMLE ÀÚµ¿ÃßÃâ ÀÇÇоà¾î »çÀü À¯»ç °Ë»ö °á°ú : 5 ÆäÀÌÁö: 3
RVL rostral ventro-lateral medulla
RVM rostral ventromedial medulla
RVM rostroventromedial medulla
VLM ventro-lateral medulla
VMM ventromedial medulla
°æºÏ´ë Ä¡°ú´ëÇÐ ±¸°­³»°ú ±³½Ç »çÀü À¯»ç °Ë»ö °á°ú : 2 ÆäÀÌÁö: 3
  • ¿µ¹®
    ÇѱÛ
    ¼³¸í
  • tumors of the kidney
    ½ÅÀå Á¾¾ç
    ½ÅÀå¿¡ ¹ß»ýÇÏ´Â Á¾¾ç. ¾Ç¼ºÀÎ °ÍÀÌ ¸¹À¸¸ç, ±× ´ëºÎºÐÀº ±×¶óºñÃ÷ Á¾¾çÀ̶ó ÇÏ´Â ½Å ½ÇÁú¿¡ »ý±â´Â ¼±¾ÏÀÌ´Ù. ÀÌ ¹Û¿¡ ½Å¿ì¿¡ »ý±â´Â À¯µÎÁ¾À̳ª À¯À¯¾Æ¿¡ »ý±â´Â ºô¸§½º Á¾¾ç µîÀÌ ÀÖ´Ù. ÁÖ¿ä Áõ¼¼·Î´Â ÀϹÝÀûÀ¸·Î Ç÷´¢, Á¾·ù, ½ÅºÎ µ¿ÅëÀÇ 3°¡ÁöÀÌÁö¸¸, ¹ß¿­À̳ª ±âħ, ±× ¹Û¿¡ ¿©·¯ °¡Áö Àü½Å Áõ¼¼·Î ½ÃÀ۵Ǵ °Íµµ ¸¹´Ù. ½Å¿ì ÃÔ¿µ, ½Åµ¿¸Æ ÃÔ¿µ µîÀ¸·Î Áø´ÜÇÑ´Ù. Ä¡·á´Â °¡±ÞÀûÀ̸é Á¶±â¿¡ ¹ß°ßÇÏ¿© ½ÅÀåÀ» ÀûÃâÇÏ°í ´ÙÀ½¿¡ ¹æ»ç¼± ¿ä¹ýÀ» ¾´´Ù. ºô¸§½º Á¾¾ç¿¡´Â ¾ÇƼ³ë¸¶À̽ŠDÀÇ Ç×¾ÏÁ¦°¡ À¯È¿ÇÏ´Ù.
  • vein of kidney
    ÄáÆÏ Á¤¸Æ
CancerWEB ¿µ¿µ ÀÇÇлçÀü À¯»ç °Ë»ö °á°ú : 15 ÆäÀÌÁö: 3
african green monkey kidney cell <cell culture> Cells taken from the kidneys of the African green monkey Cercopithecus aethiops sabaeus and used to grow certain viruses like poliovirus.
(05 Feb 1998)
amyloid kidney A kidney in which amyloidosis has occurred, usually in association with some chronic illness such as multiple myeloma, tuberculosis, osteomyelitis, or other chronic suppurative inflammation; such kidney's are moderately enlarged and grossly manifest a waxy appearance, with amyloid deposited beneath the endothelium in the glomerular loops and in the arterioles, apparently beginning as foci of thickening of the basement membranes.
Synonym: waxy kidney.
(05 Mar 2000)
anterior inferior segmental artery of kidney Origin, anterior branch of renal.
See: segmental arteries of kidney.
Synonym: arteria segmenti anterioris inferioris renis, artery of anterior {inferior segment of kidney}.
(05 Mar 2000)
anterior superior segmental artery of kidney Origin, anterior branch of renal.
See: segmental arteries of kidney.
Synonym: arteria segmenti anterioris superioris renis, artery of anterior {superior segment of kidney}.
(05 Mar 2000)
anterior surface of kidney The anterior surface of the kidney.
Synonym: facies anterior renis.
(05 Mar 2000)
anti-kidney serum nephritis Experimental glomerulonephritis produced by injection of antiserum to kidney.
(05 Mar 2000)
arciform veins of kidney Veins that parallel the arcuate arteries, receive blood from interlobular veins and straight venules, and terminate in interlobar veins.
Synonym: venae arcuatae renis, arciform veins of kidney.
(05 Mar 2000)
arcuate arteries of kidney Curved arteries at the corticomedullary border, arising from interlobar arteries and giving rise to interlobular arteries.
Synonym: arteriae arcuatae renis.
(05 Mar 2000)
arcuate veins of kidney Veins that parallel the arcuate arteries, receive blood from interlobular veins and straight venules, and terminate in interlobar veins.
Synonym: venae arcuatae renis, arciform veins of kidney.
(05 Mar 2000)
Armanni-Ebstein kidney Glycogen vacuolization of the loops of Henle, seen in diabetics before the introduction of insulin.
Synonym: Armanni-Ebstein change.
(05 Mar 2000)
arterial segments of kidney Regions of the kidney supplied by end arteries branching from the renal arteries; they are named anterior inferior segmentum, anterius superior segmentum, inferior segmentum, posterior segmentum, and superior segmentum.
Synonym: segmenta renalia, arterial segments of kidney.
(05 Mar 2000)
arteries of kidney The branches of the renal artery that supply the anatomical segments of kidney. Usually five in number, they are end arteries and give off interlobar, arcuate and interlobular arteries in sequence. The latter send afferent arterioles to the glomeruli as well as branches to the kidney capsule. The segmental arteries of the kidney are identified as: anterior inferior (arteriae segmenti anterioris inferioris renis ); anterior superior (arteriae segmenti anterioris superioris renis ); inferior (arteriae segmenti inferioris renis ); posterior (arteriae segmenti posterioris renis ); and superior (arteriae segmenti superioris renis ).
Synonym: arteriae renis, arteries of kidney.
(05 Mar 2000)
arteriolosclerotic kidney A kidney in which there is sclerosis of the arterioles, i.e., arteriolar nephrosclerosis resulting from long-standing benign hypertension. Such kidney's tend to be pale red-brown or relatively gray, moderately reduced in size, and firmer than normal organs; the capsular surfaces are uniformly finely granular. Most of the arterioles are thickened and hyalinised, thereby resulting in varying degrees of narrowing of the lumens, ischemia, and fibrosis in the interstitial tissue, leading to uniform contraction of the cortex.
(05 Mar 2000)
arteriosclerotic kidney A kidney in which there is sclerosis of arterial vessels larger than arterioles. Such kidney's are usually not significantly reduced in size, but are likely to be paler than usual; the capsular surface may be marked by a few, possibly several, conical, relatively deep V-shaped scars that result from fibrosis and ischemic atrophy of the region supplied by the affected vessel.
(05 Mar 2000)
artery of anterior inferior segment of kidney Origin, anterior branch of renal.
See: segmental arteries of kidney.
Synonym: arteria segmenti anterioris inferioris renis, artery of anterior {inferior segment of kidney}.
(05 Mar 2000)
ÀÌ ¾Æ·¡ ºÎÅÍ´Â °á°ú°¡ ¾ø½À´Ï´Ù.
KMLE ¾àǰ/ÀǾàǰ ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
  • Á¦Ç°¸í
    ¼ººÐ/ÇÔ·®
    ±¸ºÐ/º¸Çè±Þ¿©
KMLE ¾àǰ/ÀǾàǰ À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
  • Á¦Ç°¸í
    ¼ººÐ/ÇÔ·®
    ±¸ºÐ/º¸Çè±Þ¿©
¾Ë±â½¬¿î ÀÇÇпë¾îÇ®ÀÌÁý, ¼­¿ïÀÇ´ë ±³¼ö ÁöÁ¦±Ù, °í·ÁÀÇÇÐ ÃâÆÇ ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
¾Ë±â½¬¿î ÀÇÇпë¾îÇ®ÀÌÁý, ¼­¿ïÀÇ´ë ±³¼ö ÁöÁ¦±Ù, °í·ÁÀÇÇÐ ÃâÆÇ À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
´ëÇÑÀÇÇù ÀÇÇпë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
  • ¿µ¹®
    ÇѱÛ
´ëÇÑÀÇÇù Çʼö ÀÇÇпë¾îÁý »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
  • ¿µ¹®
    ÇѱÛ
´ëÇÑÀÇÇù Çʼö ÀÇÇпë¾îÁý »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
  • ¿µ¹®
    ÇѱÛ
¿¾ ´ëÇÑÀÇÇù ÀÇÇпë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
  • ¿µ¹®
    ÇѱÛ
¿¾ ´ëÇÑÀÇÇù 2 ÀÇÇпë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
  • ¿µ¹®
    ÇѱÛ
¿¾ ´ëÇÑÀÇÇù 2 ÀÇÇпë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
  • ¿µ¹®
    ÇѱÛ
¿¾ ´ëÇÑÀÇÇù 3 ÀÇÇпë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
  • ¿µ¹®
    ÇѱÛ
´ëÇÑÇØºÎÇÐȸ ÀÇÇпë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
  • ¿µ¹®
    ÇѱÛ
´ëÇÑÇØºÎÇÐȸ ÀÇÇпë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
  • ¿µ¹®
    ÇѱÛ
´ëÇѽŰæ¿Ü°úÇÐȸ ÀÇÇпë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
  • ¿µ¹®
    ÇѱÛ
    ÇÑÀÚ
´ëÇѽŰæ¿Ü°úÇÐȸ ÀÇÇпë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
  • ¿µ¹®
    ÇѱÛ
    ÇÑÀÚ
´ëÇѱâ»ýÃæÇÐȸ ÀÇÇпë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
  • ¿µ¹®
    ÇѱÛ
´ëÇѱâ»ýÃæÇÐȸ ÀÇÇпë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
  • ¿µ¹®
    ÇѱÛ
´ëÇÑ»ýÈ­ÇкÐÀÚ»ý¹°ÇÐȸ ¿ë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
  • ¿µ¹®
    ÇѱÛ
´ëÇÑ»ýÈ­ÇкÐÀÚ»ý¹°ÇÐȸ ¿ë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
  • ¿µ¹®
    ÇѱÛ
KI ÀÇÇпë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
  • ¿µ¹®
    ÇѱÛ
KI ÀÇÇпë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
  • ¿µ¹®
    ÇѱÛ
KMLE ÀÇÇоà¾î »çÀü ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
KMLE ÀÚµ¿ÃßÃâ ÀÇÇоà¾î »çÀü ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
ÀÇÇÐ³í¹® ¾àÀÚ(Pubmed/Entrez) °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
Çѱ¹Ç¥ÁØÁúº´»çÀκзù ¾àÀÚ ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
  • ÄÚµå
    ¿µ¹®
    ÇѱÛ
Çѱ¹Ç¥ÁØÁúº´»çÀκзù ¾àÀÚ À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
  • ÄÚµå
    ¿µ¹®
    ÇѱÛ
°æºÏ´ë Ä¡°ú´ëÇÐ ±¸°­³»°ú ±³½Ç »çÀü ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
  • ¿µ¹®
    ÇѱÛ
    ¼³¸í
CancerWEB ¿µ¿µ ÀÇÇлçÀü ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
MeSH(Medical Subject Headings) ¸ÂÃã °Ë»ö (http://www.nlm.nih.gov) °á°ú : 0 ÆäÀÌÁö: 3
MeSH(Medical Subject Headings) À¯»ç °Ë»ö (http://www.nlm.nih.gov) °á°ú : 0 ÆäÀÌÁö: 3
¿ÜºÎ ¸µÅ© - Merriam-Webster's ÀÇÇлçÀü ¸ÂÃã °Ë»ö (https://www.merriam-webster.com) °á°ú: 0 ÆäÀÌÁö: 3
¿ÜºÎ ¸µÅ© - Merriam-Webster's ÀÇÇлçÀü À¯»ç °Ë»ö (https://www.merriam-webster.com) °á°ú: 0 ÆäÀÌÁö: 3
¿ÜºÎ ¸µÅ© - A.D.A.M. Medical Encyclopedia ¸ÂÃã °Ë»ö (http://www.nlm.nih.gov) °á°ú: 0 ÆäÀÌÁö: 3
¿ÜºÎ ¸µÅ© - A.D.A.M. Medical Encyclopedia À¯»ç °Ë»ö (http://www.nlm.nih.gov) °á°ú: 0 ÆäÀÌÁö: 3
¿ÜºÎ ¸µÅ© - MedlinePlus Health Topics ¸ÂÃã °Ë»ö (http://www.nlm.nih.gov) °á°ú: 0 ÆäÀÌÁö: 3
¿ÜºÎ ¸µÅ© - MedlinePlus Health Topics À¯»ç °Ë»ö (http://www.nlm.nih.gov) °á°ú: 0 ÆäÀÌÁö: 3
¿ÜºÎ ¸µÅ© - µå·¯±×ÀÎÆ÷ ¾àÇÐ Á¤º¸ ¸ÂÃã °Ë»ö (http://www.druginfo.co.kr) °á°ú: 0 ÆäÀÌÁö: 3
Á¦Ç°¸í
ÆÇ¸Å»ç
º¸ÇèÄÚµå ¼ººÐ/ÇÔ·®
±¸ºÐ/º¸Çè±Þ¿©
¿ÜºÎ ¸µÅ© - µå·¯±×ÀÎÆ÷ ¾àÇÐ Á¤º¸ À¯»ç °Ë»ö (http://www.druginfo.co.kr) °á°ú: 0 ÆäÀÌÁö: 3
Á¦Ç°¸í
ÆÇ¸Å»ç
º¸ÇèÄÚµå ¼ººÐ/ÇÔ·®
±¸ºÐ/º¸Çè±Þ¿©
¿ÜºÎ ¸µÅ© - WebMD.com Drug Reference ¸ÂÃã °Ë»ö (http://www.webmd.com) °á°ú: 0 ÆäÀÌÁö: 3
¿ÜºÎ ¸µÅ© - WebMD.com Drug Reference À¯»ç °Ë»ö (http://www.webmd.com) °á°ú: 0 ÆäÀÌÁö: 3
¿ÜºÎ ¸µÅ© - Drug.com Drugs by Medical Condition ¸ÂÃã °Ë»ö (http://www.drugs.com) °á°ú: 0 ÆäÀÌÁö: 3
¿ÜºÎ ¸µÅ© - Drug.com Drugs by Medical Condition À¯»ç °Ë»ö (http://www.drugs.com) °á°ú: 0 ÆäÀÌÁö: 3
KMLE À¥ ¿ë¾î ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
KMLE À¥ ¿ë¾î À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
ÇÑ¿µ/¿µÇÑ »çÀü ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
  • ¿µ¹®
    ÇѱÛ
ÇÑ¿µ/¿µÇÑ »çÀü À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
  • ¿µ¹®
    ÇѱÛ
WordNet ÀÏ¹Ý ¿µ¿µ »çÀü °Ë»ö °á°ú : 0 ÆäÀÌÁö: 3
¿ÜºÎ ¸µÅ© - American Heritage Dictionary ¿µ¿µ»çÀü ¸ÂÃã °Ë»ö (https://www.ahdictionary.com) °á°ú: 0 ÆäÀÌÁö: 3
¿ÜºÎ ¸µÅ© - American Heritage Dictionary ¿µ¿µ»çÀü À¯»ç °Ë»ö (https://www.ahdictionary.com) °á°ú: 0 ÆäÀÌÁö: 3
ÅëÇÕ°Ë»ö ¿Ï·á